US20120305717A1 - Integrated multilayer insulation - Google Patents
Integrated multilayer insulation Download PDFInfo
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- US20120305717A1 US20120305717A1 US13/567,865 US201213567865A US2012305717A1 US 20120305717 A1 US20120305717 A1 US 20120305717A1 US 201213567865 A US201213567865 A US 201213567865A US 2012305717 A1 US2012305717 A1 US 2012305717A1
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- Prior art keywords
- support
- sheet
- sheets
- post
- arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/06—Arrangements using an air layer or vacuum
- F16L59/065—Arrangements using an air layer or vacuum using vacuum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49863—Assembling or joining with prestressing of part
Definitions
- the present invention relates generally to thermal multilayer insulation (MLI).
- Multilayer insulation is used in applications requiring lightweight, high performance thermal insulation for aerospace applications such as spacecraft, cryogenic propellant tanks including liquid hydrogen tanks for aircraft, cryogenic refrigerators, and instruments.
- MLI is typically used in a high vacuum ( ⁇ 10 ⁇ 2 Pascal) where its performance exceeds alternative insulations by a factor of ten.
- the heat flow through the MLI is usually the major heat leak in cryogenic systems, so improvements in thermal performance would be desirable.
- an insulation system that has high performance on orbit is required.
- the insulation must also provide adequate performance during pre-launch and launch to prevent heat gain, boil off of cryogenic propellants, and condensation or frost formation on the insulation outer surface.
- the insulation is required to have a low mass, so that the payload capacity of the vehicle used to place the system in orbit is not unduly affected.
- MLI technologies using a multi-layer honeycomb sandwich material for structures are light in weight and can be made very rigid relative to their weight. However, the insulation performance of such structures has been less than desired.
- Embodiments of the present invention provide a high performance integrated thermal insulation (IMLI) structure that includes a plurality of thermal radiation shields, also referred to herein as sheets.
- the sheets may comprise layers of metalized polymer material, separated by a rigid polymer structure that includes a plurality of support posts.
- the polymer structure can be thermally and structurally optimized to minimize the thermal conduction for the operating conditions.
- the structure is designed so that the insulation performance will not be significantly affected by compression effects due to gravity, allowing the low-gravity performance to be better predicted from ground testing, more consistent between regular gravity and low gravity performance, and less sensitive to labor and assembly variations.
- the insulation structure can be made strong enough to support a thin, lightweight vacuum shell, which will greatly reduce the mass of the overall insulation system when operation in the atmosphere is required.
- the use of a rigid polymer structure may also facilitate the automation of the insulation fabrication and the handling of the insulation, reducing labor costs.
- the polymer structure is arranged so that support posts are comprised of staggered post elements, such that, for a given support post, not every space between adjacent sheets includes a post element for that support post.
- the post elements of a given support post may be disposed between every other pair of alternate sheets.
- the spaces between adjacent sheets in which post elements from neighboring support posts are disposed may alternate, such that for a space in which a first support post has a first post element the second support post does not have a post element, and for a space in which the first support post does not have a first post element, the second support post does have a post element, and so on.
- This configuration which introduces gaps between the individual post elements of the support posts, at least when the IMLI structure is subject to reduced atmospheric pressure, reduces thermal conductivity of the insulation structure as compared to an embodiment with post elements in each space between adjacent sheets.
- some post elements disposed between sheets may comprise partial post elements that allow gaps in their respective support posts to form when the IMLI structure is subject to reduced pressure.
- some or all of the support posts may include a complete post element in each space between the sheets, forming a continuous support structure even when the IMLI structure of system is in a vacuum.
- beams or partial beams within spaces between adjacent sheets may be provided to interconnect neighboring support posts to one another or to support the next upper sheet.
- beams By providing beams, the alignment of support posts and the included post elements can be better controlled, particularly during assembly and installation of the IMLI structure.
- beams can be disposed within one or more of the spaces between adjacent sheets.
- the beams can be disposed between all of the posts within the IMLI structure, or can be segmented.
- An example of a segmented arrangement is to connect groups of four posts to one another by an arrangement of beams defining a square consisting of four posts.
- connections between adjacent groups of posts using beams can be omitted, for example to facilitate cutting the IMLI structure to a desired size.
- Beams can be incorporated into embodiments that include continuous posts, or posts that have staggered post elements or posts that have partial beams projecting out from the post.
- support posts can include post or support elements with a plurality of support arms.
- the support arms may extend between a top or first surface and a base or second surface. Moreover, the support arms may extend from the top platform at an angle, such that the length of each support arm is greater than the distance between the top surface of the base surface.
- the first surface may be formed by a top structure and the second surface may be formed by a base structure.
- the base structure may comprise an annular structure.
- Each support arm has a relatively small cross-sectional area, and a relatively long length.
- the support arms may be arranged in a tripod configuration.
- a support element may include a plurality of support arms and a support beam.
- the plurality of support arms may extend from a top platform at an angle, such that the length of each support arm is greater than a distance between a first or top surface defined by the top platform and a second or base surface.
- the support arms may be arranged radially around the support beam.
- the length of the support beam may be less than the distance between the first and second surfaces, at least when the support element is in an uncompressed state. In a compressed state, the support beam may define a minimum distance between the first and second surfaces.
- the post elements can be metalized in order to reduce the infrared emission of the elements. If the post elements are metalized, gaps in the metalization, for example in the form of grooves or rings, may be provided to reduce or eliminate the conductive paths that would otherwise be created as a result of the metalization. Similarly, if beams are provided, they may also be metalized. Additional features and advantages of embodiments of the present invention will become more readily apparent from the following description, particularly when taken together with the accompanying drawings.
- FIG. 1 is a cross section of an integrated multilayer insulation structure in accordance with embodiments of the present invention, in which the posts are attached to each other in a continuous in-line configuration;
- FIG. 2 is a cross section of an integrated multilayer insulation structure with beams between posts in accordance with embodiments of the present invention
- FIG. 3 is a cross section of a detail of a post design and mechanical fastener in accordance with embodiments of the present invention
- FIG. 4 is an illustration of a grid element in plan view in accordance with embodiments of the present invention.
- FIG. 5 is a cross section of an alternative embodiment of the invention in which the posts are configured with post elements that are in a staggered arrangement and are attached to the sheets but not to each other;
- FIG. 6 is a cross section of the staggered post arrangement with a hermetic outer layer
- FIG. 7 is a cross section of the staggered post arrangement with a hermetic outer layer compressed by an external load
- FIG. 8 is a plan view of a portion of the embodiment of the invention illustrated in FIG. 5 ;
- FIG. 9 is a cross section of another alternative embodiment of the invention in which the posts are configured with post elements that are in a staggered arrangement and are adhered to the sheets but are not interconnected to each other;
- FIG. 10 is a cross section of the other staggered post arrangement with a hermetic outer layer
- FIG. 11 is a cross section of the other staggered post arrangement with a hermetic outer layer compressed by an external load
- FIG. 12 is a plan view of a support element in accordance with embodiments of the present invention.
- FIG. 13 is a cross-section of the support element shown in FIG. 12 ;
- FIG. 14 is a perspective view of the support element shown in FIG. 12 ;
- FIG. 15 is a perspective view of a support element in accordance with other embodiments of the present invention.
- FIG. 16 is a perspective view of a support element in accordance with other embodiments of the present invention.
- FIG. 17 is a cross-section of a support element in accordance with other embodiments of the present invention.
- FIG. 18 is a cross-section of the support element of FIG. 17 , under compression
- FIG. 19 is a top perspective view of a support element in accordance with other embodiments of the present invention.
- FIG. 20 is a bottom perspective view of the support element of FIG. 19 ;
- FIG. 21 is a cross-section of an integrated multilayer insulation structure with support elements having support beams in accordance with embodiments of the present invention.
- FIG. 22 is a cross-section of the integrated multilayer insulation structure of FIG. 21 under compression.
- the present invention is directed to an integrated multilayer insulation (IMLI) structure.
- the IMLI structure 100 in accordance with embodiments of the present invention can include support posts 104 that each comprise a number of post or support elements 112 .
- the support posts 104 generally support and maintain a space or separation 122 between adjacent thermal radiation shields (also referred to herein as sheets) 120 .
- a base post element 114 in each support post 104 can be bonded or otherwise interconnected to a base structure or layer 108 .
- the base layer 108 can be the radiation shield 120 comprised of the layer of polymer or other material immediately adjacent the item being insulated, or it can be the item being insulated.
- the support posts 104 can comprise a number of stacked post elements 112 .
- the post elements 112 may be interconnected to one another to form a continuous support post 104 structure using mechanical attachments, fasteners, magnets, molecular or electrical bonding, solvent bonding, an adhesive or by polymer welding 116 , either directly or with a portion of a sheet 120 between.
- An interconnection 116 comprising a mechanical attachment 118 can be any of a variety of designs, including the snap fastener shown in FIG. 1 .
- the mechanical attachment 118 can hold the post elements 112 loosely together, so that the mechanical attachment 118 does not add to the compressive force on the support posts 104 .
- the mechanical attachment 118 traps individual sheets or layers comprising the radiation shields 120 of the IMLI structure 100 in between the post elements 112 of the support posts 104 .
- the sheets 120 are thus spaced apart from one another.
- the sheets 120 are spaced apart from one another by a distance equal to the height of the post elements 112 interposed between adjacent sheets 120 .
- post elements 112 can be adhered or bonded to a sheet 120 opposite one another to create continuous support posts 104 .
- the sheets 120 may be formed from a metalized polymer with a low emissitivity surface, such as silverized, goldized, aluminized MYLAR (polyethylene terephthalate polyester film) or KAPTON (polyimide film), or from a thin, low emissitivity metal such as aluminum or tungsten foil.
- a metalized polymer with a low emissitivity surface such as silverized, goldized, aluminized MYLAR (polyethylene terephthalate polyester film) or KAPTON (polyimide film)
- a thin, low emissitivity metal such as aluminum or tungsten foil.
- the post elements 112 may be fabricated from a molded polymer with low thermal conductivity, high compressive strength and hardness and low vacuum outgassing such as polyetherimide, polyimide, polyamide-imide, polyethyl ketone or wholly aromatic copolyesters, or from high-temperature spacer materials such as alumina or ceramic.
- the post elements 112 may be formed from ULTEM (polyetherimide) or PEEK (polyetheretherketone).
- the post element 112 surface that contacts a sheet 120 can be made with a rough texture, such as grooves, to minimize the contact conductance between post elements 112 of a post 104 and the sheet 120 and the post elements 120 of adjacent posts.
- the use of support posts 104 which have a relatively limited contact area with the sheets 120 that are supported, can reduce conduction through the structure 100 as compared to structures using a honeycomb, web, net or other support structure.
- the area of a sheet 120 surface that is in contact with a support post 104 is less than 3% of the total area of that sheet 120 surface.
- the area of the sheet surface in contact with a support post 104 is less than 1% of the total area of that sheet 120 surface.
- Embodiments of the invention can be used in connection with providing a vacuum insulation requiring all the spaces or volumes 122 between sheets 120 to be evacuated to a high vacuum (less than 10 ⁇ 2 Pa).
- an air tight top or outer layer 124 also referred to herein as hermetic layer 124
- top or outermost surface of the support posts 104 refers to the surface of the top post elements 128 , which are the layer or course of post elements 112 that are generally the farthest from the base layer or the item being insulated 108 .
- This top surface of the support posts 104 may be formed using top post elements 128 that provide a suitable mounting surface 132 .
- the spaces between the sheets or layers 120 defining the volumes 122 can be evacuated to a high vacuum (less than 10 ⁇ 2 Pa) and the support posts 104 are put in compression due to the atmospheric pressure.
- a vent path 136 (see FIG. 3 ) through the interior of the posts 104 can be provided to facilitate the evacuation of the interior volumes of the posts 104 .
- An IMLI insulation structure 100 with an integrated vacuum tight hermetic layer 124 in accordance with embodiments of the present invention can potentially be much lighter than a conventional MLI combined with a separate vacuum shell. Since the hermetic layer 124 is supported by the underlying insulation, it can be thinner and lower mass than conventional vacuum shells.
- the performance of the IMLI structure 100 is more predictable than conventional MLIs, as it is not as subject to any or as much performance variation under different compressive loads.
- the IMLI insulation structure 100 would have a somewhat higher conductance than a conventional MLI if the IMLI were designed to withstand a one atmosphere load.
- An IMLI structure 100 in accordance with embodiments of the present invention can have significantly lower conductance than a conventional MLI when it does not need to be designed for a one atmosphere structural load.
- FIG. 2 illustrates an IMLI structure 100 in accordance with other embodiments of the present invention.
- the support posts 104 are connected to adjacent support posts 104 by beams 204 .
- the beams 204 may be fabricated from the same material as the post elements 112 .
- the beams 204 may be provided as part of grid elements or integral beam and post structures 208 comprising four post elements 112 and four beams 204 .
- An example integral beam and post structure 208 is illustrated in plan view in FIG. 4 .
- the purpose of the beams 204 is to assist in the handling and alignment of the post elements 112 during assembly, and to reinforce the buckling strength of the support posts 104 .
- the beams 204 can be arranged so they connect all the support posts 104 in a two-dimensional grid. Alternatively, the beams 204 can be arranged so there are gaps in the grid pattern 212 , as shown, to reduce mass, provide flexibiltiy to the structure 100 and to provide a place to more easily cut the assembly. The beams 204 can also be disposed within each volume 122 between adjacent sheets 120 , or in less than every volume 122 .
- groups of post elements 112 formed by interconnecting post elements 112 with beams 204 in a first number of the volumes 122 can be connected to other groups of post elements 112 by beams 204 in a second number of volumes 122 , where the first number is greater than the second number, to provide greater control of the separation of adjacent support posts 104 while also facilitating cutting of the IMLI structure 100 .
- Other arrangements or combinations of beams 204 and post elements 112 are also possible.
- FIG. 3 shows a detail of a support post 104 design incorporating a snap fastener or mechanical attachment 118 that could be readily molded.
- a post element 112 includes flexible tabs 304 with a flat (or angled) locking surface 306 that are molded onto or integral with a post element body 308 .
- a through slot 312 that the tabs 304 on the adjacent post element 112 snap into so that the locking surface 306 engages the slot 312 may be provided to hold interconnected post elements 112 together.
- top post elements 128 for use at a top or outer layer of insulation may omit the tabs 304 , and instead terminate at the top of the post element body 308 in an attachment or terminal surface (e.g., surface 132 shown in FIG. 1 ).
- FIG. 3 also illustrates how the sheets 120 can be joined to the support posts 104 .
- the sheets 120 may be provided with perforations 316 having a diameter that is greater than the distance between tabs 304 , but less than the diameter of the post body 308 . Accordingly, by placing the tabs 304 of a first post element 112 through a perforation 316 in a first sheet 120 a , and by then joining the first post element 112 a to a second post element 112 b , the first sheet 120 a can be trapped between the two post elements 112 a and 112 b and thus can be held at a desired spacing from other sheets 120 b and 120 c on either side of the first sheet 120 a.
- Hook and loop (“Velcro”) or interlocking mushroom shaped attachments have been developed for other applications and could be used to attach stacked post elements 112 .
- sewing or stapling could be used.
- An alternative approach is to provide an interconnection 116 comprising magnets to enable the post elements 112 to be attached to each other magnetically.
- the post elements 112 could have magnets bonded, post molded or over-molded into the ends that would be attracted to magnets of opposite polarity on other post elements 112 .
- each post element 112 can be bonded or adhered to the sheet or sheets 120 that it is in contact with using, as examples, polyurethane adhesive, epoxy adhesive, or pressure sensitive adhesives.
- embodiments of the present invention can use sheets 120 that are not perforated.
- embodiments in which post elements 112 are adhered to the sheets 120 can benefit from the use of unperforated sheets 120 , as thermal radiation through the structure 100 can be reduced by eliminating perforations in the sheets 120 .
- Unperforated sheets 120 can also be used in combination with post elements 112 that pierce the sheet 120 between two post elements 112 when those post elements are interconnected to one another.
- FIG. 5 illustrates in elevation an IMLI structure 100 in accordance with embodiments of the present invention in which the post elements 112 are configured in a staggered arrangement and are attached to the sheets 120 but not to each other, either directly or through intermediate sheets 120 .
- a first set of support posts 104 . 1 includes post elements 112 . 1 that extend across the space between sheets 120 with respect to a first set of volumes 122 . 1 , but that do not extend across a volume 122 . 2 included in a second set of volumes, at least when the top most post elements 112 are not subject to a compressive load.
- a second set of support posts 104 . 2 include post elements 112 . 2 that extend across volume 122 .
- an application of an IMLI structure 100 in accordance with such embodiments is as a replacement for conventional multilayer insulation where a high vacuum can be obtained, such as through the provision of a vacuum shell or in the case of spaceflight, the ambient environment.
- partial post elements 504 can be provided at intervals.
- FIG. 8 is an illustration of the IMLI structure 100 of FIG. 5 , in plan view and taken along section line 8 - 8 of FIG. 5 .
- the post elements 112 . 1 of a first course or layer of the IMLI structure 100 alternate with the post elements 112 . 2 of a second course or layer.
- FIG. 6 illustrates the IMLI structure 100 of FIG. 5 being used to support a hermetic outer layer 124 while the IMLI structure 100 is itself supported by a tank or other structure comprising the base layer 108 .
- a high vacuum is acquired between the insulation layers 120 .
- the sheets 120 are approximately flat and the post elements 112 within each support post 104 are separated from each other, breaking conductive paths that would otherwise exist between post elements 112 .
- the IMLI structure 100 When there is atmospheric pressure on the outer hermetic layer 124 , the IMLI structure 100 is compressed until the post elements 112 within each support post 104 support each other to transfer the load of the atmosphere on the hermetic layer 124 to the base layer 108 as shown in FIG. 7 .
- the size of the post elements 112 and their spacing is sufficient to support a one atmosphere load when the insulation 100 is in the compressed configuration, while preventing contact between adjacent sheets 120 .
- the partial posts 504 prevent direct contact and maintain a volume 122 between the base structure or layer 108 and the first sheet 120 for those posts 104 that do not have a post element interconnected to the first sheet 120 .
- post elements 112 may include an extension 508 to prevent direct contact between sheets 120 .
- extension 508 to prevent direct contact between sheets 120 .
- the structure 100 illustrated in FIG. 9 includes post elements 112 that are configured in a staggered arrangement, similar to the embodiment illustrated in FIG. 6 .
- each of the post elements 112 are adhered to a surface of a radiation shield of sheet 120 , rather than being mechanically attached to the sheet 120 .
- the sheets 120 are not perforated, and thus a post element 112 does not extend to either side of the sheet 120 to which it is attached.
- a post element 112 adhered to one side of a sheet 120 can be paired with a partial post element 504 or an extension adhered to the opposite side of the sheet so that in profile the post element 112 appears like the post elements as shown in FIG. 5 , but no perforations in the sheets 120 are required.
- thermal radiation through the IMLI structure 100 is reduced as compared to embodiments in which the sheets 120 are perforated.
- the embodiment of the IMLI structure 100 illustrated in FIG. 9 features post elements 112 that have been metalized.
- a thin (e.g., 500 ⁇ ) layer of aluminum, gold, silver or other metal may be deposited on the surface of the post elements 112 to reduce the infrared absorption of the post element 112 as compared to an un-metalized post element 112 .
- the metallization of post elements 112 may comprise the formation or provision of a metal layer 804 that covers all or substantially all of the exposed surface of the post elements 112 .
- substantially all of the exposed surface of a post element 112 comprises at least most of the surface of a post element 112 that is not adhered to or in contact with a sheet 120 .
- the metallization of the post elements 112 can be patterned, so that gaps 808 are formed in the layer of metal 804 , thereby interrupting the conductive path along the metalized surface. Accordingly, the degradation in the insulation performance of the IMLI structure 100 caused by creating conductive paths along the post elements 112 due to metallization can be reduced.
- the layer of metal 804 is created using vapor deposition or other metal deposition techniques.
- the gaps 808 in the metal layer 804 can be formed by masking the post elements 112 during vapor deposition, or by removing portions of the metal layer 804 by etching or mechanical processes. Similar processes can be used to create gaps in a metal layer formed on beams 204 for embodiments that include beams 204 . Alternatively, the gaps need not be formed in the layer of metal, or the gaps need not be complete, to provide electrically conductive post elements 112 . Electrically conductive post elements 112 can be used in combination with electrically conductive polymer sheets 120 , such as black KAPTON, to provide an electrically conductive IMLI structure 100 .
- FIG. 10 illustrates the IMLI structure 100 of FIG. 9 being used to support a hermetic outer layer 124 while the IMLI structure 100 is in turn supported by a tank or other structure 108 .
- a high vacuum is obtained in the spaces 122 between sheets 120 .
- FIG. 10 illustrates the configuration of the IMLI structure 100 in the absence of atmospheric pressure.
- the support posts 104 are segmented, breaking conductive paths that would otherwise exist along the support posts 104 because of the lack of a compressive load on the IMLI structure 100 when there is no atmospheric pressure on the outside of the hermetic layer 124 . More particularly, gaps between the post elements 112 of the support posts 104 are created when the pressure or atmospheric load on the IMLI structure 100 is reduced or removed and the sheets 120 elastically return to a flat (or flatter) configuration.
- FIG. 11 illustrates the IMLI structure 100 of FIG. 10 , when the structure 100 is subject to atmospheric pressure.
- the IMLI structure 100 is compressed until the post elements 112 of the support posts 104 support one another. Accordingly, even though the space between the hermetic layer 124 and the base structure or layer 108 is reduced, at least some of the volume and spacing between the sheets 120 of the IMLI structure 100 is maintained.
- the insulation performance of the structure 100 while under atmospheric load is somewhat reduced, due to the decreased spacing and the creation of conductive paths through the support posts 104 , that performance is still close to the performance expected of the IMLI structure 100 when the atmospheric load is removed.
- the insulation performance and properties of the IMLI structure 100 can be better predicted even when the IMLI structure 100 is subject to such loads, as compared to conventional MLI structures.
- FIG. 12 illustrates a post element or support element 112 in accordance with other embodiments of the present invention.
- the support element 112 includes a first or top surface 1204 formed by a top structure 1208 . Extending from the top structure 1208 are a plurality of spokes or support arms 1212 .
- the support arms 1212 terminate at a base structure 1216 .
- the base structure 1216 may comprise an annular structure to which each of the support arms 1212 is connected.
- the base structure 1216 may be of another form (e.g., triangular, polygonal, semi-circles, etc.).
- a base structure 1216 can be omitted.
- a first end 1214 of the support arms 1212 may be arranged around a first perimeter or diameter at the top structure 1208
- a second end 1218 of the support arms 1212 may be arranged around a second perimeter or diameter at the base structure 1216 .
- the first perimeter or diameter may be smaller than the second perimeter or diameter.
- a top structure 1208 and a base structure 1216 may be oriented such that, at least from the perspective of a viewer, the base structure 1216 is above, below, or at the same elevation as the top structure 1208 .
- FIG. 13 is a cross-section of the support element 112 of FIG. 12
- FIG. 14 illustrates that exemplary embodiment in perspective view.
- the support arms 1212 extend from the top structure 1208 at an angle ⁇ with respect to one another.
- the angle ⁇ is an obtuse angle.
- the angle ⁇ between the plane defined by the top surface 1204 and the support arms 1212 can be from greater than 0° to 90°.
- the angle ⁇ can be less than 45°.
- the angle ⁇ may be about 20°.
- first or top surface 1204 defined or formed by the top platform 1208 can be seen, as can a second or base surface 1304 formed by the base structure 1216 or by a surface of the support arms 1212 if the support element 112 does not include a base structure 1216 .
- the distance between the plane of the first surface 1204 and the plane of the second surface 1304 is D 1 .
- the plane of the first surface can be parallel to the plane of the second surface.
- the length of a support arm 1212 is greater than the distance D 1 between the first surface 1204 and the second surface 1304 .
- the length of a support arm 1212 when measured as the distance L, between the top structure 1208 and base structure 1216 , the length of a support arm 1212 may be greater than the distance D 1 between the plane defined by the top surface 1204 and the plane defined by the base surface 1304 .
- the length of a support arm 1212 when measured as the distance L 2 between the top surface 1204 and the base surface 1304 along the support arm 1212 under consideration, the length of a support arm 1212 is greater than the distance D 1 between the plane defined by the top surface 1204 and the plane defined by the base surface 1304 .
- FIG. 15 illustrates a support or post element 112 in accordance with further embodiments of the present invention.
- the top structure 1208 includes a plurality of support surface beams 1504 .
- the cross-sectional area of the support arms 1212 relative to the length of the support arms 1212 is reduced.
- the thermal conductivity of a support element 112 is reduced as the ratio of the support arm's 112 cross-sectional area A to the support arm's 112 length L is reduced.
- the support surface beams 1504 can provide increased area, for example to adhere to a first sheet or layer 120 .
- the base structure 1216 likewise provides the base surface 1304 to which a second sheet or layer can be adhered.
- FIG. 16 illustrates a support element 112 in accordance with still other embodiments of the present invention.
- the support arms 1212 are curved.
- the curved support arms 1212 can be arranged in a spiral fashion. Such a configuration allows the area to length ratio of the support arms 1212 to be lowered, by increasing the length as compared to a configuration in which the support arms 1212 have the same cross-sectional area but are straight.
- FIG. 17 illustrates a support element 112 that in accordance with embodiments of the present invention includes a support beam 1704 .
- the support beam 1704 generally extends from the top structure 1208 .
- the support beam 1704 has a length L 3 that is less than the distance D 1 between the first surface 1204 and the second surface 1304 , at least in the configuration illustrated in FIG. 17 .
- a third surface 1708 at the free end 1712 of the support beam 1704 lies between the planes defined by the first 1204 and second 1304 surfaces, and such that a gap exits between the third surface 1708 and any underlying structure (such as a sheet 120 ).
- the support beam 1704 is not in direct contact with the sheet 120 adjacent or attached to the second surface 1304 of the support element 1212 , at least while there is no compressive load on the support element 112 or while any compressive load is insufficient to bend the support arms 1212 such that the gap is eliminated.
- the support arms 1212 may be arranged around the support beam 1704 in a radial fashion and with equal spacing between adjacent support arms 1212 in a tripod configuration, for example as shown in FIGS. 19 and 20 .
- a first end 1214 of the support arms 1212 may be arranged around a first perimeter or diameter at the top structure 1208
- a second end 1218 of the support arms may be arranged around a second perimeter or diameter at the base structure 1216 .
- a support element 112 may comprise other numbers or configurations of support arms 1212 .
- the first end 1214 of the support arms may form the top surface 1204 and may be joined to one another directly, and then a top structure 1208 can be omitted.
- the top surface 1204 need not be planar.
- the top surface 1204 can be domed.
- FIG. 18 the configuration of the support element 112 of FIG. 17 is shown while a compressive force F is applied to the top surface 1204 (and a reactive force F′ is present).
- the distance between the first surface 1204 and the second surface 1304 is D 2 ) which is less than the distance D 1 shown in FIG. 17 .
- the distance D 2 is equal to the length L 3 of the support beam 1704 .
- the support arms 1212 are flexed or bent as a result of the application of the compressive force F.
- the provision of a central beam 1704 can allow a support element 112 to maintain at least some spacing between adjacent sheets 120 , even when significant external forces are applied.
- the provision of support elements 112 with a support beam 1704 can be used to maintain acceptable insulation performance while the integrated multilayer insulation structure 100 is in normal Earth atmosphere.
- the gap between the free end 1712 of the support beam 1704 and the shield adjacent and/or attached to the second surface 1304 of the support element 1212 is reestablished such that the support element 112 returns to the configuration illustrated in FIG. 17 , resulting in increased insulation performance. Accordingly, increased performance can be realized on orbit or when the external force is otherwise removed.
- FIGS. 19 and 20 illustrate further embodiments of a support element 112 in accordance with the present invention.
- the support beam 1704 has a Y shaped cross-section.
- the arms of the Y shaped support beam 1704 can be aligned with the support arms 1504 of the top structure 1208 .
- the arms of the Y can be arranged so that they fall between the support arms 1212 .
- Such a configuration can increase the support provided by the support element 112 when that support element 112 is subjected to a compressive force, while minimizing the conductance of heat through the support element 112 once the compressive force is removed.
- the support beam 1704 may feature other cross-sectional shapes and/or orientations.
- the support beam 1704 may comprise a solid or an open (hollow) cylinder.
- FIG. 21 illustrates a portion of an IMLI structure 100 in accordance with embodiments of the present invention in cross-section that includes support elements 112 like those illustrated in FIGS. 17 to 20 .
- the IMLI structure 100 in FIG. 21 is not undergoing a compressive force, such that a distance D 1 is maintained between adjacent sheets 120 , and such that a gap G 1 is present between the third surface 1708 at the free end 1712 of each support beam 1704 and the adjacent sheet 120 .
- the only conductive heat transfer path between adjacent sheets 120 is through the support arms 1212 .
- this conductive path is limited. This is representative of the state of the IMLI structure 100 in a vacuum.
- FIG. 22 illustrates the IMLI structure 100 of FIG. 21 when a compressive force is applied to that structure 100 .
- the support arms 1212 are bent, compressing the support elements 112 of the support post 104 .
- the free ends 1708 of the support element 112 support beams 1704 are brought into contact with an adjacent sheet 120 .
- the third surface 1708 at the free end 1712 of the support beam 1704 provided as part of the support element 112 on a first side of the sheet 120 is supported by the first surface 1204 of the support element 112 on a second side of that sheet 120 .
- the distance between adjacent sheets 120 is the distance D 2 ) where D 2 is less than D 1 (see FIG. 21 ).
- the bending of the support elements 1212 such that a load is transmitted allows the support beams 1704 of the support elements 112 to create a support post 104 with a contiguous, in-line support structure.
- the configuration illustrated in FIG. 22 is representative of an IMLI structure 100 in accordance with embodiments of the present invention in which a vacuum is formed within the IMLI structure 100 and while the IMLI structure 100 is under normal atmospheric conditions.
- the insulation performance of the IMLI system 100 under atmospheric conditions is diminished as compared to when the structure 100 is in a vacuum or under reduced pressure (e.g., as illustrated in FIG. 21 ), favorable insulation characteristics and resistance to load can be provided.
- Methods of forming an IMLI structure 100 in accordance with embodiments of the present invention include providing a plurality of sheets of material 120 , each comprising a thermal radiation shield.
- a plurality of post elements are provided.
- a first set of post elements 112 included in the plurality of post elements 112 is interconnected to a first sheet 120 included in the plurality of sheets of material 120 .
- a second sheet 120 is then registered with the first sheet and the first set of post elements 112 , and the first set of post elements 112 is interconnected to the second sheet 120 .
- a second set of post elements 112 is registered with the first set of post elements 112 and interconnected to the second sheet 120 .
- registering the first and second sets of post elements includes aligning the first and second sets of post elements 112 so that they correspond to one another when the IMLI structure 100 is considered in plan view.
- registering the first and second sets of post elements 112 includes aligning the first and second sets of post elements such that, when the IMLI structure 100 is considered in plan view, the first and second sets of post elements 112 do not approximately correspond to one another.
- interconnecting post elements 112 to a sheet 120 can comprise inserting a portion of a post element 112 through a perforation in a sheet 120 and interconnecting that post element 112 to another post element 112 on the opposite side of the sheet 120 .
- post elements can be self piercing, such that a perforation is formed in a sheet when a post element on a first side of a sheet 120 is interconnected to another post element on a second side of the sheet.
- post elements 112 or a post element 112 and a post element extension 508 can be aligned with one another and adhered to opposite sides of a sheet 120 .
- post elements may be adhered or otherwise bonded to one or two sheets 120 forming the volume 120 in which the post element 112 is situated, while the side of the sheet or sheets 120 opposite the side to which the post element 112 is bonded does not have another post element 112 or extension 508 bonded to it opposite the first post element 112 .
- such methods for forming an IMLI structure 100 can be repeated until a desired number of sheets 120 have been interconnected to one another via post elements 112 . If a base layer 108 and/or hermetic layer 124 are to be provided as part of the IMLI structure 100 , that structure 100 can be completed by the inclusion and interconnection of such layers 108 , 124 with the sheets 120 .
- an IMLI structure 100 can be formed by registering a plurality of support elements 112 with a first sheet 120 and by adhering or bonding the first surface 1204 of the plurality of support elements 112 to a first side of the first sheet 120 .
- a second sheet 120 is then registered with the first sheet 120 and adhered or bonded to the second surface 1304 of the support elements 112 on a first side of the second sheet 120 .
- a second set of support elements 112 may then be registered with and adhered to a second side of the second sheet 120 .
- the surface of a support element 112 that is bonded to a particular sheet 120 may be varied, for example by layer and/or location within a layer.
- the second set of support elements 112 is aligned such that each support element 112 in the first set of support elements 112 is in line with a support element 112 of the second set of support elements 112 .
- Forming an IMLI structure 100 in accordance with embodiments of the present invention can additionally include creating a vacuum within the volume between some or all of the pairs of adjacent sheets 120 . This can then result in a net compressive force being applied to the structure 100 .
- the support elements 112 include support beams 1704
- this can then result in the third surface 1712 of the support beams 1704 being placed into contact with an adjacent sheet 120 , such that a continuous structure or post 104 is created, allowing the applied force to be supported.
- the distance between adjacent sheets may be expanded, and a gap between the free end 1708 of the support beams 1704 and adjacent sheets 120 can be established.
- an exemplary IMLI structure 100 in accordance with embodiments of the present invention may feature a base layer 108 that is a sheet of metal or polymer that is about 1-20 mils thick.
- the first layer or course of post elements 112 can be molded into or as part of the base layer 108 .
- the first layer of post elements 112 may also be bonded directly to the object being insulated.
- the height of each post element body 308 can be about 40 to 80 mils, and the width or diameter of each post element 112 can likewise be about 40 to 300 mils.
- the radiation shields or sheets 120 internal to the IMLI structure 100 can have a thickness of from about 0.10 to 5.0 mil.
- the radiation shields or sheets 120 internal to the IMLI structure 100 can have a thickness of from about 0.25 to 5.0 mil.
- the top or outer layer of insulation 124 can have a thickness of about 1.0 to 20 mils thick.
- the total number of sheets or layers 120 in the exemplary structure can be 5 to 10 layers with about 10 layers per centimeter of thickness. Additional structures of 5 to 10 layers can be added as required to achieve the required thermal insulation.
- an IMLI structure may have up to 120 layers 120 .
- an IMLI structure 100 in accordance with embodiments of the present invention may have any number of layers 120 .
- spacing between adjacent support posts 104 can vary depending on the height of the post elements 112 , thickness of the sheets 120 , structural loads, the thermal performance requirements and other factors. In accordance with exemplary embodiments of an IMLI structure 100 as described herein, spacing between adjacent support posts 104 may be from about 1 cm to about 10 cm.
- the support arms or spokes 1212 may feature an ultra low cross-section.
- the cross-sectional area A may be about 0.00008 square inches
- the length L of each support arm 1212 may be about 0.175 inches. This results in an area to length ratio of 0.00046.
- the support posts 112 may be formed from a micro molded polymer, ceramic, glass, or other insulators. Although certain configurations of support posts 112 have been illustrated, it should be appreciated that these examples are not intended to be limiting. In particular, other configurations are possible. For instance, more than three support arms 1212 may be provided. In addition, a base structure 1216 need not be annular.
- the second surface 1304 can be formed by the ends of the support arms 1212 , and is not required to be associated with any base structure 1216 .
- the second surface 1304 need not comprise a planar surface.
- a first surface 1204 can be formed from the ends of the support arms 1212 opposite the ends of the support arms that form or are proximate to the second surface 1304 .
- post elements 112 can be metalized and/or formed from conductive materials to provide a conductive insulating blanket or IMLI 100 structure.
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Abstract
A multilayer insulation with an array of posts is provided. In particular, the posts are comprised of multiple post or support elements that are interconnected to radiation shields or sheets comprising the layers of the integrated multi-layer insulation (IMLI) structure. The support elements maintain spacing between adjacent sheets, thus maintaining a volume between the sheets. The support elements can each feature a plurality of support arms. The support elements can each additionally include a support beam that defines a minimum spacing between sheets when the IMLI structure is under a compressive load. Neighboring support elements can be interconnected to one another by beams.
Description
- This application is a continuation of U.S. patent application Ser. No. 12/493,852, filed Jun. 29, 2009, which is continuation in part of U.S. patent application Ser. No. 12/041,326, filed Mar. 3, 2008, which claims the benefit of U.S. Provisional Patent Application Ser. No. 60/895,349, filed Mar. 16, 2007, the entire disclosures of which are hereby incorporated herein by reference.
- The present invention relates generally to thermal multilayer insulation (MLI).
- Multilayer insulation (MLI) is used in applications requiring lightweight, high performance thermal insulation for aerospace applications such as spacecraft, cryogenic propellant tanks including liquid hydrogen tanks for aircraft, cryogenic refrigerators, and instruments. MLI is typically used in a high vacuum (<10−2 Pascal) where its performance exceeds alternative insulations by a factor of ten. However, the heat flow through the MLI is usually the major heat leak in cryogenic systems, so improvements in thermal performance would be desirable.
- In cryogenic space propulsion applications, an insulation system that has high performance on orbit is required. However, the insulation must also provide adequate performance during pre-launch and launch to prevent heat gain, boil off of cryogenic propellants, and condensation or frost formation on the insulation outer surface. Also, the insulation is required to have a low mass, so that the payload capacity of the vehicle used to place the system in orbit is not unduly affected.
- Current multilayer insulation consists of layers of metalized polymer sheets that are separated by fabric web or net, typically made of silk or polyester. The fabric net is often attached to the polymer sheets only at the edges. The thermal and mechanical contact between the net and sheets is not well controlled and therefore the conductance through the layers is difficult to predictably characterize. The net is a soft fiber material that has a high thermal contact conductance. Use of the insulation within the atmosphere requires a vacuum shell that does not put a compressive load on the insulation. Such a vacuum shell is inherently heavy (on the order of 10 kg/m̂2) and difficult to make more lightweight because the shell has to resist buckling under external loading of atmospheric pressure over 10,000 kg force per square meter.
- Other MLI technologies using a multi-layer honeycomb sandwich material for structures are light in weight and can be made very rigid relative to their weight. However, the insulation performance of such structures has been less than desired.
- Accordingly, there is a need for a lightweight, high performance thermal insulation for critical missions such as NASA's next generation spacecraft for space exploration mission. Insulation that can provide high thermal performance both in-atmosphere and on-orbit (in vacuum) is critical to the success of NASA Exploration spacecraft.
- Embodiments of the present invention provide a high performance integrated thermal insulation (IMLI) structure that includes a plurality of thermal radiation shields, also referred to herein as sheets. The sheets may comprise layers of metalized polymer material, separated by a rigid polymer structure that includes a plurality of support posts. The polymer structure can be thermally and structurally optimized to minimize the thermal conduction for the operating conditions. The structure is designed so that the insulation performance will not be significantly affected by compression effects due to gravity, allowing the low-gravity performance to be better predicted from ground testing, more consistent between regular gravity and low gravity performance, and less sensitive to labor and assembly variations. The insulation structure can be made strong enough to support a thin, lightweight vacuum shell, which will greatly reduce the mass of the overall insulation system when operation in the atmosphere is required. The use of a rigid polymer structure may also facilitate the automation of the insulation fabrication and the handling of the insulation, reducing labor costs.
- In accordance with embodiments of the present invention, the polymer structure is arranged so that support posts are comprised of staggered post elements, such that, for a given support post, not every space between adjacent sheets includes a post element for that support post. For example, the post elements of a given support post may be disposed between every other pair of alternate sheets. In addition, the spaces between adjacent sheets in which post elements from neighboring support posts are disposed may alternate, such that for a space in which a first support post has a first post element the second support post does not have a post element, and for a space in which the first support post does not have a first post element, the second support post does have a post element, and so on. This configuration, which introduces gaps between the individual post elements of the support posts, at least when the IMLI structure is subject to reduced atmospheric pressure, reduces thermal conductivity of the insulation structure as compared to an embodiment with post elements in each space between adjacent sheets. Alternatively, some post elements disposed between sheets may comprise partial post elements that allow gaps in their respective support posts to form when the IMLI structure is subject to reduced pressure. As yet another alternative, some or all of the support posts may include a complete post element in each space between the sheets, forming a continuous support structure even when the IMLI structure of system is in a vacuum.
- In accordance with further embodiments of the present invention, beams or partial beams within spaces between adjacent sheets may be provided to interconnect neighboring support posts to one another or to support the next upper sheet. By providing beams, the alignment of support posts and the included post elements can be better controlled, particularly during assembly and installation of the IMLI structure. If provided, beams can be disposed within one or more of the spaces between adjacent sheets. Also, the beams can be disposed between all of the posts within the IMLI structure, or can be segmented. An example of a segmented arrangement is to connect groups of four posts to one another by an arrangement of beams defining a square consisting of four posts. Moreover, connections between adjacent groups of posts using beams can be omitted, for example to facilitate cutting the IMLI structure to a desired size. Beams can be incorporated into embodiments that include continuous posts, or posts that have staggered post elements or posts that have partial beams projecting out from the post.
- In accordance with embodiments of the present invention, support posts can include post or support elements with a plurality of support arms. The support arms may extend between a top or first surface and a base or second surface. Moreover, the support arms may extend from the top platform at an angle, such that the length of each support arm is greater than the distance between the top surface of the base surface. The first surface may be formed by a top structure and the second surface may be formed by a base structure. In accordance with embodiments of the present invention, the base structure may comprise an annular structure. Each support arm has a relatively small cross-sectional area, and a relatively long length. In accordance with embodiments of the present invention, the support arms may be arranged in a tripod configuration.
- In accordance with further embodiments of the present invention, a support element may include a plurality of support arms and a support beam. The plurality of support arms may extend from a top platform at an angle, such that the length of each support arm is greater than a distance between a first or top surface defined by the top platform and a second or base surface. Moreover, the support arms may be arranged radially around the support beam. In addition, the length of the support beam may be less than the distance between the first and second surfaces, at least when the support element is in an uncompressed state. In a compressed state, the support beam may define a minimum distance between the first and second surfaces.
- In accordance with other embodiments of the present invention, the post elements can be metalized in order to reduce the infrared emission of the elements. If the post elements are metalized, gaps in the metalization, for example in the form of grooves or rings, may be provided to reduce or eliminate the conductive paths that would otherwise be created as a result of the metalization. Similarly, if beams are provided, they may also be metalized. Additional features and advantages of embodiments of the present invention will become more readily apparent from the following description, particularly when taken together with the accompanying drawings.
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FIG. 1 is a cross section of an integrated multilayer insulation structure in accordance with embodiments of the present invention, in which the posts are attached to each other in a continuous in-line configuration; -
FIG. 2 is a cross section of an integrated multilayer insulation structure with beams between posts in accordance with embodiments of the present invention; -
FIG. 3 is a cross section of a detail of a post design and mechanical fastener in accordance with embodiments of the present invention; -
FIG. 4 is an illustration of a grid element in plan view in accordance with embodiments of the present invention; -
FIG. 5 is a cross section of an alternative embodiment of the invention in which the posts are configured with post elements that are in a staggered arrangement and are attached to the sheets but not to each other; -
FIG. 6 is a cross section of the staggered post arrangement with a hermetic outer layer; -
FIG. 7 is a cross section of the staggered post arrangement with a hermetic outer layer compressed by an external load; -
FIG. 8 is a plan view of a portion of the embodiment of the invention illustrated inFIG. 5 ; -
FIG. 9 is a cross section of another alternative embodiment of the invention in which the posts are configured with post elements that are in a staggered arrangement and are adhered to the sheets but are not interconnected to each other; -
FIG. 10 is a cross section of the other staggered post arrangement with a hermetic outer layer; -
FIG. 11 is a cross section of the other staggered post arrangement with a hermetic outer layer compressed by an external load; -
FIG. 12 is a plan view of a support element in accordance with embodiments of the present invention; -
FIG. 13 is a cross-section of the support element shown inFIG. 12 ; -
FIG. 14 is a perspective view of the support element shown inFIG. 12 ; -
FIG. 15 is a perspective view of a support element in accordance with other embodiments of the present invention; -
FIG. 16 is a perspective view of a support element in accordance with other embodiments of the present invention; -
FIG. 17 is a cross-section of a support element in accordance with other embodiments of the present invention; -
FIG. 18 is a cross-section of the support element ofFIG. 17 , under compression; -
FIG. 19 is a top perspective view of a support element in accordance with other embodiments of the present invention; -
FIG. 20 is a bottom perspective view of the support element ofFIG. 19 ; -
FIG. 21 is a cross-section of an integrated multilayer insulation structure with support elements having support beams in accordance with embodiments of the present invention; and -
FIG. 22 is a cross-section of the integrated multilayer insulation structure ofFIG. 21 under compression. - The present invention is directed to an integrated multilayer insulation (IMLI) structure. As shown in
FIG. 1 , theIMLI structure 100 in accordance with embodiments of the present invention can includesupport posts 104 that each comprise a number of post or supportelements 112. The support posts 104 generally support and maintain a space orseparation 122 between adjacent thermal radiation shields (also referred to herein as sheets) 120. Abase post element 114 in eachsupport post 104 can be bonded or otherwise interconnected to a base structure orlayer 108. Thebase layer 108 can be theradiation shield 120 comprised of the layer of polymer or other material immediately adjacent the item being insulated, or it can be the item being insulated. The support posts 104 can comprise a number of stackedpost elements 112. Thepost elements 112 may be interconnected to one another to form acontinuous support post 104 structure using mechanical attachments, fasteners, magnets, molecular or electrical bonding, solvent bonding, an adhesive or bypolymer welding 116, either directly or with a portion of asheet 120 between. Aninterconnection 116 comprising amechanical attachment 118 can be any of a variety of designs, including the snap fastener shown inFIG. 1 . - The
mechanical attachment 118 can hold thepost elements 112 loosely together, so that themechanical attachment 118 does not add to the compressive force on the support posts 104. Themechanical attachment 118 traps individual sheets or layers comprising the radiation shields 120 of theIMLI structure 100 in between thepost elements 112 of the support posts 104. Thesheets 120 are thus spaced apart from one another. For example, in the embodiment illustrated inFIG. 1 , thesheets 120 are spaced apart from one another by a distance equal to the height of thepost elements 112 interposed betweenadjacent sheets 120. Alternatively, postelements 112 can be adhered or bonded to asheet 120 opposite one another to create continuous support posts 104. Thesheets 120 may be formed from a metalized polymer with a low emissitivity surface, such as silverized, goldized, aluminized MYLAR (polyethylene terephthalate polyester film) or KAPTON (polyimide film), or from a thin, low emissitivity metal such as aluminum or tungsten foil. - The
post elements 112 may be fabricated from a molded polymer with low thermal conductivity, high compressive strength and hardness and low vacuum outgassing such as polyetherimide, polyimide, polyamide-imide, polyethyl ketone or wholly aromatic copolyesters, or from high-temperature spacer materials such as alumina or ceramic. As an example, thepost elements 112 may be formed from ULTEM (polyetherimide) or PEEK (polyetheretherketone). Thepost element 112 surface that contacts asheet 120 can be made with a rough texture, such as grooves, to minimize the contact conductance betweenpost elements 112 of apost 104 and thesheet 120 and thepost elements 120 of adjacent posts. Moreover, the use of support posts 104, which have a relatively limited contact area with thesheets 120 that are supported, can reduce conduction through thestructure 100 as compared to structures using a honeycomb, web, net or other support structure. In accordance with embodiments of the present invention, the area of asheet 120 surface that is in contact with asupport post 104 is less than 3% of the total area of thatsheet 120 surface. In accordance with other embodiments, the area of the sheet surface in contact with asupport post 104 is less than 1% of the total area of thatsheet 120 surface. - Embodiments of the invention can be used in connection with providing a vacuum insulation requiring all the spaces or
volumes 122 betweensheets 120 to be evacuated to a high vacuum (less than 10−2 Pa). If the integratedmultilayer insulation structure 100 is to operate in the atmosphere, an air tight top or outer layer 124 (also referred to herein as hermetic layer 124) of thin metal, polymer or other material can be bonded or mechanically attached to the top or outermost surface of the support posts 104. As used herein, “top” or “outermost” surface of the support posts 104 refers to the surface of thetop post elements 128, which are the layer or course ofpost elements 112 that are generally the farthest from the base layer or the item being insulated 108. This top surface of the support posts 104 may be formed usingtop post elements 128 that provide a suitable mountingsurface 132. - The spaces between the sheets or layers 120 defining the
volumes 122 can be evacuated to a high vacuum (less than 10−2 Pa) and the support posts 104 are put in compression due to the atmospheric pressure. A vent path 136 (seeFIG. 3 ) through the interior of theposts 104 can be provided to facilitate the evacuation of the interior volumes of theposts 104. AnIMLI insulation structure 100 with an integrated vacuum tighthermetic layer 124 in accordance with embodiments of the present invention can potentially be much lighter than a conventional MLI combined with a separate vacuum shell. Since thehermetic layer 124 is supported by the underlying insulation, it can be thinner and lower mass than conventional vacuum shells. In addition, the performance of theIMLI structure 100 is more predictable than conventional MLIs, as it is not as subject to any or as much performance variation under different compressive loads. For laminated insulators having comparible numbers of layers of radiation shields and/or layer spacing, theIMLI insulation structure 100 would have a somewhat higher conductance than a conventional MLI if the IMLI were designed to withstand a one atmosphere load. AnIMLI structure 100 in accordance with embodiments of the present invention can have significantly lower conductance than a conventional MLI when it does not need to be designed for a one atmosphere structural load. -
FIG. 2 illustrates anIMLI structure 100 in accordance with other embodiments of the present invention. In particular, some or all of the support posts 104 are connected to adjacent support posts 104 bybeams 204. In accordance with embodiments of the present invention, thebeams 204 may be fabricated from the same material as thepost elements 112. In accordance with still other embodiments of the present invention, thebeams 204 may be provided as part of grid elements or integral beam and poststructures 208 comprising fourpost elements 112 and fourbeams 204. An example integral beam andpost structure 208 is illustrated in plan view inFIG. 4 . The purpose of thebeams 204 is to assist in the handling and alignment of thepost elements 112 during assembly, and to reinforce the buckling strength of the support posts 104. Thebeams 204 can be arranged so they connect all the support posts 104 in a two-dimensional grid. Alternatively, thebeams 204 can be arranged so there are gaps in thegrid pattern 212, as shown, to reduce mass, provide flexibiltiy to thestructure 100 and to provide a place to more easily cut the assembly. Thebeams 204 can also be disposed within eachvolume 122 betweenadjacent sheets 120, or in less than everyvolume 122. As yet another alternative, groups ofpost elements 112 formed by interconnectingpost elements 112 withbeams 204 in a first number of thevolumes 122 can be connected to other groups ofpost elements 112 bybeams 204 in a second number ofvolumes 122, where the first number is greater than the second number, to provide greater control of the separation of adjacent support posts 104 while also facilitating cutting of theIMLI structure 100. Other arrangements or combinations ofbeams 204 and postelements 112 are also possible. -
FIG. 3 shows a detail of asupport post 104 design incorporating a snap fastener ormechanical attachment 118 that could be readily molded. According to this design, apost element 112 includesflexible tabs 304 with a flat (or angled) lockingsurface 306 that are molded onto or integral with apost element body 308. A throughslot 312 that thetabs 304 on theadjacent post element 112 snap into so that the lockingsurface 306 engages theslot 312 may be provided to holdinterconnected post elements 112 together. In accordance with further embodiments of the present invention,top post elements 128 for use at a top or outer layer of insulation may omit thetabs 304, and instead terminate at the top of thepost element body 308 in an attachment or terminal surface (e.g.,surface 132 shown inFIG. 1 ). -
FIG. 3 also illustrates how thesheets 120 can be joined to the support posts 104. In particular, thesheets 120 may be provided withperforations 316 having a diameter that is greater than the distance betweentabs 304, but less than the diameter of thepost body 308. Accordingly, by placing thetabs 304 of afirst post element 112 through aperforation 316 in afirst sheet 120 a, and by then joining thefirst post element 112 a to asecond post element 112 b, thefirst sheet 120 a can be trapped between the twopost elements other sheets 120 b and 120 c on either side of thefirst sheet 120 a. - Additional mechanical methods exist for attaching the posts to each other. Hook and loop (“Velcro”) or interlocking mushroom shaped attachments have been developed for other applications and could be used to attach stacked
post elements 112. As further examples, sewing or stapling could be used. An alternative approach is to provide aninterconnection 116 comprising magnets to enable thepost elements 112 to be attached to each other magnetically. Thepost elements 112 could have magnets bonded, post molded or over-molded into the ends that would be attracted to magnets of opposite polarity onother post elements 112. As still another alternative, eachpost element 112 can be bonded or adhered to the sheet orsheets 120 that it is in contact with using, as examples, polyurethane adhesive, epoxy adhesive, or pressure sensitive adhesives. In addition, embodiments of the present invention can usesheets 120 that are not perforated. For example, embodiments in which postelements 112 are adhered to thesheets 120 can benefit from the use ofunperforated sheets 120, as thermal radiation through thestructure 100 can be reduced by eliminating perforations in thesheets 120.Unperforated sheets 120 can also be used in combination withpost elements 112 that pierce thesheet 120 between twopost elements 112 when those post elements are interconnected to one another. -
FIG. 5 illustrates in elevation anIMLI structure 100 in accordance with embodiments of the present invention in which thepost elements 112 are configured in a staggered arrangement and are attached to thesheets 120 but not to each other, either directly or throughintermediate sheets 120. In particular, a first set of support posts 104.1 includes post elements 112.1 that extend across the space betweensheets 120 with respect to a first set of volumes 122.1, but that do not extend across a volume 122.2 included in a second set of volumes, at least when the topmost post elements 112 are not subject to a compressive load. Similarly, a second set of support posts 104.2 include post elements 112.2 that extend across volume 122.2, but that do not extend across any volume in the first set of volumes 122.1. This has the effect of reducing the thermal conductivity of theinsulation structure 100, because conduction betweenpost elements 112 included within asupport post 104 is interrupted by the gaps betweenpost elements 112, and the conduction path between posts is through the thin sheets. Accordingly, an application of anIMLI structure 100 in accordance with such embodiments is as a replacement for conventional multilayer insulation where a high vacuum can be obtained, such as through the provision of a vacuum shell or in the case of spaceflight, the ambient environment. As shown by theline 502 ofsupport posts 104 visible in the figure,partial post elements 504 can be provided at intervals. -
FIG. 8 is an illustration of theIMLI structure 100 ofFIG. 5 , in plan view and taken along section line 8-8 ofFIG. 5 . As depicted inFIG. 8 , the post elements 112.1 of a first course or layer of theIMLI structure 100 alternate with the post elements 112.2 of a second course or layer. -
FIG. 6 illustrates theIMLI structure 100 ofFIG. 5 being used to support a hermeticouter layer 124 while theIMLI structure 100 is itself supported by a tank or other structure comprising thebase layer 108. A high vacuum is acquired between the insulation layers 120. As shown inFIG. 6 , when there is no atmospheric pressure on the outside of thehermetic layer 124, thesheets 120 are approximately flat and thepost elements 112 within eachsupport post 104 are separated from each other, breaking conductive paths that would otherwise exist betweenpost elements 112. - When there is atmospheric pressure on the outer
hermetic layer 124, theIMLI structure 100 is compressed until thepost elements 112 within eachsupport post 104 support each other to transfer the load of the atmosphere on thehermetic layer 124 to thebase layer 108 as shown inFIG. 7 . In accordance with embodiments of the present invention, the size of thepost elements 112 and their spacing is sufficient to support a one atmosphere load when theinsulation 100 is in the compressed configuration, while preventing contact betweenadjacent sheets 120. As illustrated, thepartial posts 504 prevent direct contact and maintain avolume 122 between the base structure orlayer 108 and thefirst sheet 120 for thoseposts 104 that do not have a post element interconnected to thefirst sheet 120. In addition, postelements 112 may include anextension 508 to prevent direct contact betweensheets 120. When the atmospheric load is reduced such as in spaceflight, thepolymer sheets 120 elastically return to a flat shape, and thepost elements 112 separate from each other as shown inFIG. 6 . This reduces the heat transfer between layers and allows for higher insulation performance during spaceflight. - With reference now to
FIG. 9 , anIMLI structure 100 in accordance with other embodiments of the present invention is illustrated. In particular, thestructure 100 illustrated inFIG. 9 includespost elements 112 that are configured in a staggered arrangement, similar to the embodiment illustrated inFIG. 6 . However, inFIG. 9 each of thepost elements 112 are adhered to a surface of a radiation shield ofsheet 120, rather than being mechanically attached to thesheet 120. Moreover, in this embodiment, thesheets 120 are not perforated, and thus apost element 112 does not extend to either side of thesheet 120 to which it is attached. Alternatively, apost element 112 adhered to one side of asheet 120 can be paired with apartial post element 504 or an extension adhered to the opposite side of the sheet so that in profile thepost element 112 appears like the post elements as shown inFIG. 5 , but no perforations in thesheets 120 are required. By eliminating perforations in thesheets 120, thermal radiation through theIMLI structure 100 is reduced as compared to embodiments in which thesheets 120 are perforated. - In addition, the embodiment of the
IMLI structure 100 illustrated inFIG. 9 features postelements 112 that have been metalized. In accordance with embodiments of the present invention, a thin (e.g., 500 Å) layer of aluminum, gold, silver or other metal may be deposited on the surface of thepost elements 112 to reduce the infrared absorption of thepost element 112 as compared to anun-metalized post element 112. By reducing the infrared absorption of thepost elements 112, the insulation performance of thestructure 100 can be improved. The metallization ofpost elements 112 may comprise the formation or provision of ametal layer 804 that covers all or substantially all of the exposed surface of thepost elements 112. As used herein, substantially all of the exposed surface of apost element 112 comprises at least most of the surface of apost element 112 that is not adhered to or in contact with asheet 120. The metallization of thepost elements 112 can be patterned, so thatgaps 808 are formed in the layer ofmetal 804, thereby interrupting the conductive path along the metalized surface. Accordingly, the degradation in the insulation performance of theIMLI structure 100 caused by creating conductive paths along thepost elements 112 due to metallization can be reduced. In accordance with embodiments of the present invention, the layer ofmetal 804 is created using vapor deposition or other metal deposition techniques. Thegaps 808 in themetal layer 804 can be formed by masking thepost elements 112 during vapor deposition, or by removing portions of themetal layer 804 by etching or mechanical processes. Similar processes can be used to create gaps in a metal layer formed onbeams 204 for embodiments that include beams 204. Alternatively, the gaps need not be formed in the layer of metal, or the gaps need not be complete, to provide electricallyconductive post elements 112. Electricallyconductive post elements 112 can be used in combination with electricallyconductive polymer sheets 120, such as black KAPTON, to provide an electricallyconductive IMLI structure 100. -
FIG. 10 illustrates theIMLI structure 100 ofFIG. 9 being used to support a hermeticouter layer 124 while theIMLI structure 100 is in turn supported by a tank orother structure 108. A high vacuum is obtained in thespaces 122 betweensheets 120. In addition,FIG. 10 illustrates the configuration of theIMLI structure 100 in the absence of atmospheric pressure. In particular, the support posts 104 are segmented, breaking conductive paths that would otherwise exist along the support posts 104 because of the lack of a compressive load on theIMLI structure 100 when there is no atmospheric pressure on the outside of thehermetic layer 124. More particularly, gaps between thepost elements 112 of the support posts 104 are created when the pressure or atmospheric load on theIMLI structure 100 is reduced or removed and thesheets 120 elastically return to a flat (or flatter) configuration. -
FIG. 11 illustrates theIMLI structure 100 ofFIG. 10 , when thestructure 100 is subject to atmospheric pressure. In particular, theIMLI structure 100 is compressed until thepost elements 112 of the support posts 104 support one another. Accordingly, even though the space between thehermetic layer 124 and the base structure orlayer 108 is reduced, at least some of the volume and spacing between thesheets 120 of theIMLI structure 100 is maintained. Although the insulation performance of thestructure 100 while under atmospheric load is somewhat reduced, due to the decreased spacing and the creation of conductive paths through the support posts 104, that performance is still close to the performance expected of theIMLI structure 100 when the atmospheric load is removed. As a result, the insulation performance and properties of theIMLI structure 100 can be better predicted even when theIMLI structure 100 is subject to such loads, as compared to conventional MLI structures. -
FIG. 12 illustrates a post element orsupport element 112 in accordance with other embodiments of the present invention. In general, thesupport element 112 includes a first ortop surface 1204 formed by atop structure 1208. Extending from thetop structure 1208 are a plurality of spokes orsupport arms 1212. Thesupport arms 1212 terminate at abase structure 1216. Thebase structure 1216 may comprise an annular structure to which each of thesupport arms 1212 is connected. Alternatively, thebase structure 1216 may be of another form (e.g., triangular, polygonal, semi-circles, etc.). As still another alternative, abase structure 1216 can be omitted. As shown, afirst end 1214 of thesupport arms 1212 may be arranged around a first perimeter or diameter at thetop structure 1208, and asecond end 1218 of thesupport arms 1212 may be arranged around a second perimeter or diameter at thebase structure 1216. In addition, the first perimeter or diameter may be smaller than the second perimeter or diameter. As can be appreciated by one of skill in the art after consideration of the present disclosure, the terms “top” and “base” are used for convenience of description, but are not limiting as to the orientation of thesupport element 112. More particularly, as anIMLI structure 100 in accordance with embodiments of the present invention can be oriented in any direction, atop structure 1208 and abase structure 1216 may be oriented such that, at least from the perspective of a viewer, thebase structure 1216 is above, below, or at the same elevation as thetop structure 1208. -
FIG. 13 is a cross-section of thesupport element 112 ofFIG. 12 , andFIG. 14 illustrates that exemplary embodiment in perspective view. As shown inFIG. 13 , thesupport arms 1212 extend from thetop structure 1208 at an angle θ with respect to one another. In accordance with embodiments of the present invention, the angle θ is an obtuse angle. The angle α between the plane defined by thetop surface 1204 and thesupport arms 1212 can be from greater than 0° to 90°. In accordance with further embodiments, the angle α can be less than 45°. In accordance with other embodiments, the angle α may be about 20°. In addition, the first ortop surface 1204 defined or formed by thetop platform 1208 can be seen, as can a second orbase surface 1304 formed by thebase structure 1216 or by a surface of thesupport arms 1212 if thesupport element 112 does not include abase structure 1216. The distance between the plane of thefirst surface 1204 and the plane of thesecond surface 1304 is D1. The plane of the first surface can be parallel to the plane of the second surface. In accordance with embodiments of the present invention, the length of asupport arm 1212 is greater than the distance D1 between thefirst surface 1204 and thesecond surface 1304. More particularly, when measured as the distance L, between thetop structure 1208 andbase structure 1216, the length of asupport arm 1212 may be greater than the distance D1 between the plane defined by thetop surface 1204 and the plane defined by thebase surface 1304. Alternatively or in addition, when measured as the distance L2 between thetop surface 1204 and thebase surface 1304 along thesupport arm 1212 under consideration, the length of asupport arm 1212 is greater than the distance D1 between the plane defined by thetop surface 1204 and the plane defined by thebase surface 1304. -
FIG. 15 illustrates a support orpost element 112 in accordance with further embodiments of the present invention. In particular, thetop structure 1208 includes a plurality of support surface beams 1504. In addition, the cross-sectional area of thesupport arms 1212 relative to the length of thesupport arms 1212 is reduced. In general, the thermal conductivity of asupport element 112 is reduced as the ratio of the support arm's 112 cross-sectional area A to the support arm's 112 length L is reduced. Accordingly, the thermal performance of anIMLI structure 100 incorporating thesupport element 112 can be improved as compared to other support element designs, or as compared conventional designs that utilize a fabric web or net to maintain spacing between layers or sheets. Thesupport surface beams 1504 can provide increased area, for example to adhere to a first sheet orlayer 120. Thebase structure 1216 likewise provides thebase surface 1304 to which a second sheet or layer can be adhered. -
FIG. 16 illustrates asupport element 112 in accordance with still other embodiments of the present invention. As shown, thesupport arms 1212 are curved. As also shown, thecurved support arms 1212 can be arranged in a spiral fashion. Such a configuration allows the area to length ratio of thesupport arms 1212 to be lowered, by increasing the length as compared to a configuration in which thesupport arms 1212 have the same cross-sectional area but are straight. -
FIG. 17 illustrates asupport element 112 that in accordance with embodiments of the present invention includes asupport beam 1704. Thesupport beam 1704 generally extends from thetop structure 1208. Thesupport beam 1704 has a length L3 that is less than the distance D1 between thefirst surface 1204 and thesecond surface 1304, at least in the configuration illustrated inFIG. 17 . Accordingly, at least in some conditions, athird surface 1708 at thefree end 1712 of thesupport beam 1704 lies between the planes defined by the first 1204 and second 1304 surfaces, and such that a gap exits between thethird surface 1708 and any underlying structure (such as a sheet 120). Therefore thesupport beam 1704 is not in direct contact with thesheet 120 adjacent or attached to thesecond surface 1304 of thesupport element 1212, at least while there is no compressive load on thesupport element 112 or while any compressive load is insufficient to bend thesupport arms 1212 such that the gap is eliminated. Thesupport arms 1212 may be arranged around thesupport beam 1704 in a radial fashion and with equal spacing betweenadjacent support arms 1212 in a tripod configuration, for example as shown inFIGS. 19 and 20 . Moreover, afirst end 1214 of thesupport arms 1212 may be arranged around a first perimeter or diameter at thetop structure 1208, and asecond end 1218 of the support arms may be arranged around a second perimeter or diameter at thebase structure 1216. Alternatively, asupport element 112 may comprise other numbers or configurations ofsupport arms 1212. Alternatively or in addition, thefirst end 1214 of the support arms may form thetop surface 1204 and may be joined to one another directly, and then atop structure 1208 can be omitted. According to still other embodiments, thetop surface 1204 need not be planar. For example, thetop surface 1204 can be domed. - In
FIG. 18 , the configuration of thesupport element 112 ofFIG. 17 is shown while a compressive force F is applied to the top surface 1204 (and a reactive force F′ is present). In this condition, the distance between thefirst surface 1204 and thesecond surface 1304 is D2) which is less than the distance D1 shown inFIG. 17 . Moreover, the distance D2 is equal to the length L3 of thesupport beam 1704. In addition, it can be seen that thesupport arms 1212 are flexed or bent as a result of the application of the compressive force F. As can be appreciated by one of skill in the art, the provision of acentral beam 1704 can allow asupport element 112 to maintain at least some spacing betweenadjacent sheets 120, even when significant external forces are applied. For example, in configurations where the integrated multilayer insulation is used to support a vacuum shell, the provision ofsupport elements 112 with asupport beam 1704 can be used to maintain acceptable insulation performance while the integratedmultilayer insulation structure 100 is in normal Earth atmosphere. Moreover, when the external force is removed, the gap between thefree end 1712 of thesupport beam 1704 and the shield adjacent and/or attached to thesecond surface 1304 of thesupport element 1212 is reestablished such that thesupport element 112 returns to the configuration illustrated inFIG. 17 , resulting in increased insulation performance. Accordingly, increased performance can be realized on orbit or when the external force is otherwise removed. -
FIGS. 19 and 20 illustrate further embodiments of asupport element 112 in accordance with the present invention. In accordance with such embodiments, thesupport beam 1704 has a Y shaped cross-section. The arms of the Y shapedsupport beam 1704 can be aligned with thesupport arms 1504 of thetop structure 1208. In addition, the arms of the Y can be arranged so that they fall between thesupport arms 1212. Such a configuration can increase the support provided by thesupport element 112 when thatsupport element 112 is subjected to a compressive force, while minimizing the conductance of heat through thesupport element 112 once the compressive force is removed. In accordance with further embodiments, thesupport beam 1704 may feature other cross-sectional shapes and/or orientations. For example, thesupport beam 1704 may comprise a solid or an open (hollow) cylinder. -
FIG. 21 illustrates a portion of anIMLI structure 100 in accordance with embodiments of the present invention in cross-section that includessupport elements 112 like those illustrated inFIGS. 17 to 20 . TheIMLI structure 100 inFIG. 21 is not undergoing a compressive force, such that a distance D1 is maintained betweenadjacent sheets 120, and such that a gap G1 is present between thethird surface 1708 at thefree end 1712 of eachsupport beam 1704 and theadjacent sheet 120. As a result, the only conductive heat transfer path betweenadjacent sheets 120 is through thesupport arms 1212. Moreover, because of the relatively low cross-sectional area to length ratio of thesupport arms 1212, this conductive path is limited. This is representative of the state of theIMLI structure 100 in a vacuum.FIG. 22 illustrates theIMLI structure 100 ofFIG. 21 when a compressive force is applied to thatstructure 100. In such a condition, thesupport arms 1212 are bent, compressing thesupport elements 112 of thesupport post 104. In addition, the free ends 1708 of thesupport element 112support beams 1704 are brought into contact with anadjacent sheet 120. Where asheet 120 is between twosupport elements 112, thethird surface 1708 at thefree end 1712 of thesupport beam 1704 provided as part of thesupport element 112 on a first side of thesheet 120 is supported by thefirst surface 1204 of thesupport element 112 on a second side of thatsheet 120. In this configuration, there is no gap between thethird surface 1708 of thesupport beam 1704 and theadjacent sheet 120. In addition, the distance betweenadjacent sheets 120 is the distance D2) where D2 is less than D1 (seeFIG. 21 ). Moreover, the bending of thesupport elements 1212 such that a load is transmitted allows the support beams 1704 of thesupport elements 112 to create asupport post 104 with a contiguous, in-line support structure. In accordance with embodiments of the present invention, the configuration illustrated inFIG. 22 is representative of anIMLI structure 100 in accordance with embodiments of the present invention in which a vacuum is formed within theIMLI structure 100 and while theIMLI structure 100 is under normal atmospheric conditions. Moreover, while the insulation performance of theIMLI system 100 under atmospheric conditions is diminished as compared to when thestructure 100 is in a vacuum or under reduced pressure (e.g., as illustrated inFIG. 21 ), favorable insulation characteristics and resistance to load can be provided. - Methods of forming an
IMLI structure 100 in accordance with embodiments of the present invention include providing a plurality of sheets ofmaterial 120, each comprising a thermal radiation shield. In addition, a plurality of post elements are provided. A first set ofpost elements 112 included in the plurality ofpost elements 112 is interconnected to afirst sheet 120 included in the plurality of sheets ofmaterial 120. Asecond sheet 120 is then registered with the first sheet and the first set ofpost elements 112, and the first set ofpost elements 112 is interconnected to thesecond sheet 120. A second set ofpost elements 112 is registered with the first set ofpost elements 112 and interconnected to thesecond sheet 120. In accordance with embodiments of the present invention featuring support posts 104 havingpost elements 112 that form a continuous,inline support post 104 configuration, registering the first and second sets of post elements includes aligning the first and second sets ofpost elements 112 so that they correspond to one another when theIMLI structure 100 is considered in plan view. In accordance with embodiments of the present invention in which the support posts 104 are in a staggered configuration, such that gaps along individual support posts 104 are created when theIMLI structure 100 is in a vacuum or otherwise not subjected to full atmospheric pressure, registering the first and second sets ofpost elements 112 includes aligning the first and second sets of post elements such that, when theIMLI structure 100 is considered in plan view, the first and second sets ofpost elements 112 do not approximately correspond to one another. Moreover, interconnectingpost elements 112 to asheet 120 can comprise inserting a portion of apost element 112 through a perforation in asheet 120 and interconnecting that postelement 112 to anotherpost element 112 on the opposite side of thesheet 120. Alternatively, post elements can be self piercing, such that a perforation is formed in a sheet when a post element on a first side of asheet 120 is interconnected to another post element on a second side of the sheet. In accordance with other embodiments of the present invention, postelements 112 or apost element 112 and apost element extension 508 can be aligned with one another and adhered to opposite sides of asheet 120. In accordance with still other embodiments of the present invention, post elements may be adhered or otherwise bonded to one or twosheets 120 forming thevolume 120 in which thepost element 112 is situated, while the side of the sheet orsheets 120 opposite the side to which thepost element 112 is bonded does not have anotherpost element 112 orextension 508 bonded to it opposite thefirst post element 112. As can be appreciated by one of skill in the art after consideration of the present disclosure, such methods for forming anIMLI structure 100 can be repeated until a desired number ofsheets 120 have been interconnected to one another viapost elements 112. If abase layer 108 and/orhermetic layer 124 are to be provided as part of theIMLI structure 100, thatstructure 100 can be completed by the inclusion and interconnection ofsuch layers sheets 120. - In accordance with further embodiments of the present invention, an
IMLI structure 100 can be formed by registering a plurality ofsupport elements 112 with afirst sheet 120 and by adhering or bonding thefirst surface 1204 of the plurality ofsupport elements 112 to a first side of thefirst sheet 120. Asecond sheet 120 is then registered with thefirst sheet 120 and adhered or bonded to thesecond surface 1304 of thesupport elements 112 on a first side of thesecond sheet 120. A second set ofsupport elements 112 may then be registered with and adhered to a second side of thesecond sheet 120. The surface of asupport element 112 that is bonded to aparticular sheet 120 may be varied, for example by layer and/or location within a layer. In accordance with embodiments of the present invention, the second set ofsupport elements 112 is aligned such that eachsupport element 112 in the first set ofsupport elements 112 is in line with asupport element 112 of the second set ofsupport elements 112. Forming anIMLI structure 100 in accordance with embodiments of the present invention can additionally include creating a vacuum within the volume between some or all of the pairs ofadjacent sheets 120. This can then result in a net compressive force being applied to thestructure 100. Where thesupport elements 112 includesupport beams 1704, this can then result in thethird surface 1712 of the support beams 1704 being placed into contact with anadjacent sheet 120, such that a continuous structure or post 104 is created, allowing the applied force to be supported. Moreover, by removing the compressive force, for example by placing theIMLI structure 100 into a low pressure environment or a vacuum, the distance between adjacent sheets may be expanded, and a gap between thefree end 1708 of the support beams 1704 andadjacent sheets 120 can be established. - For purposes of illustration, and without limitation, an
exemplary IMLI structure 100 in accordance with embodiments of the present invention may feature abase layer 108 that is a sheet of metal or polymer that is about 1-20 mils thick. In addition, the first layer or course ofpost elements 112 can be molded into or as part of thebase layer 108. The first layer ofpost elements 112 may also be bonded directly to the object being insulated. The height of eachpost element body 308 can be about 40 to 80 mils, and the width or diameter of eachpost element 112 can likewise be about 40 to 300 mils. In accordance with embodiments of the present invention, the radiation shields orsheets 120 internal to theIMLI structure 100 can have a thickness of from about 0.10 to 5.0 mil. In accordance with further embodiments of the present invention, the radiation shields orsheets 120 internal to theIMLI structure 100 can have a thickness of from about 0.25 to 5.0 mil. The top or outer layer ofinsulation 124 can have a thickness of about 1.0 to 20 mils thick. The total number of sheets or layers 120 in the exemplary structure can be 5 to 10 layers with about 10 layers per centimeter of thickness. Additional structures of 5 to 10 layers can be added as required to achieve the required thermal insulation. In accordance with other embodiments, an IMLI structure may have up to 120layers 120. As a further example, anIMLI structure 100 in accordance with embodiments of the present invention may have any number oflayers 120. The spacing between adjacent support posts 104 can vary depending on the height of thepost elements 112, thickness of thesheets 120, structural loads, the thermal performance requirements and other factors. In accordance with exemplary embodiments of anIMLI structure 100 as described herein, spacing between adjacent support posts 104 may be from about 1 cm to about 10 cm. - The support arms or
spokes 1212 may feature an ultra low cross-section. For example, the cross-sectional area A may be about 0.00008 square inches, and the length L of eachsupport arm 1212 may be about 0.175 inches. This results in an area to length ratio of 0.00046. The support posts 112 may be formed from a micro molded polymer, ceramic, glass, or other insulators. Although certain configurations ofsupport posts 112 have been illustrated, it should be appreciated that these examples are not intended to be limiting. In particular, other configurations are possible. For instance, more than threesupport arms 1212 may be provided. In addition, abase structure 1216 need not be annular. Moreover, thesecond surface 1304 can be formed by the ends of thesupport arms 1212, and is not required to be associated with anybase structure 1216. In addition, thesecond surface 1304 need not comprise a planar surface. Alternatively or in addition, afirst surface 1204 can be formed from the ends of thesupport arms 1212 opposite the ends of the support arms that form or are proximate to thesecond surface 1304. - The IMLI described here can operate in-atmosphere, and have terrestrial applications such as liquid oxygen containers for medical use, liquid nitrogen and liquid helium storage tanks (dewars) for medical uses (MRI) and research uses requiring cryogenic temperatures, for building insulation, insulation shipping and storage containers, refrigerators, freezers and water heaters. In accordance with still other embodiments, post
elements 112 can be metalized and/or formed from conductive materials to provide a conductive insulating blanket orIMLI 100 structure. - The foregoing discussion of the invention has been presented for purposes of illustration and description. Further, the description is not intended to limit the invention to the form disclosed herein. Consequently, variations and modifications commensurate with the above teachings, within the skill or knowledge of the relevant art, are within the scope of the present invention. The embodiments described hereinabove are further intended to explain the best mode presently known of practicing the invention and to enable others skilled in the art to utilize the invention in such or in other embodiments and with various modifications required by the particular application or use of the invention. It is intended that the appended claims be construed to include alternative embodiments to the extent permitted by the prior art.
Claims (21)
1. A multilayer thermal insulation support element, comprising:
a first support surface;
a second support surface, wherein the first support surface is separated from the second support surface by at least a first distance;
a plurality of support arms interconnecting the first support surface to the second support surface, wherein each support arm in the plurality of support arms has a length that is greater than the first distance.
2. The support element of claim 1 , wherein the first support surface is separated from the second support surface by the first distance in a first load condition, wherein the first support surface is separated from the second support surface by a second distance in a second load condition, and wherein the first distance is greater than the second distance.
3. The support element of claim 2 , wherein the plurality of support arms are flexible, and wherein the plurality of support arms are flexed in the second load condition.
4. The support element of claim 1 , wherein three support arms are included in the plurality of support arms, and wherein the support arms form a tripod.
5. The support element of claim 1 , wherein the first support surface is coincident with a first plane and is defined by a top structure, wherein the second support surface is coincident with a second plane and is defined by a base structure, and wherein the first and second planes are parallel to one another.
6. The support element of claim 5 , wherein the plurality of support arms extend radially from the top structure and define a conical section.
7. The support element of claim 5 , wherein the base structure is a ring.
8. The support element of claim 5 , wherein the top structure includes a plurality of support surface beams.
9. The support element of claim 1 , further comprising: a support beam, wherein the support beam has a length that is less than the first distance.
10. The support element of claim 9 , wherein the central beam extends from a top structure, wherein the support beam is centered between the plurality of support arms.
11. A multilayer thermal insulation structure, comprising:
a plurality of sheets;
a plurality of support elements, the plurality of support elements including a first support element, the first support element including:
a first support surface, wherein a first sheet included in the plurality of sheets is in contact with the first support surface;
a second support surface, wherein a second sheet included in the plurality of sheets is in contact with the second support surface;
a plurality of support arms interconnecting the first support surface and the second support surface.
12. The structure of claim 11 , wherein a second support element included in the plurality of support elements has a first support surface in contact with the second sheet and a second support surface in contact with a third sheet included in the plurality of sheets.
13. The structure of claim 12 , wherein the second support surface of the first support element that is in contact with a first side of the second sheet, and wherein the first support surface of the second support element is in contact with a second side of the second sheet adjacent the second support surface of the first support element.
14. The structure of claim 11 , wherein a second support element included in the plurality of support elements has a first support surface in contact with the first sheet and a second support surface in contact with the second sheet.
15. The structure of claim 11 , wherein at least some of the support elements in the plurality of support elements include a support beam.
16. The structure of claim 13 , wherein the first and second support elements each include a central support beam extending from the first support surface of the respective support element, wherein in a first state the support beam of the first support element is not in contact with the second sheet, and wherein in a second state the support beam of the first support element is in contact with the second sheet.
17. The structure of claim 11 , wherein the first support surface of the first support element defines a first plane, and wherein the support arms extend from a first support structure providing the first support surface at an angle and such that an obtuse angle is formed between any two of the support arms included in the plurality of support arms in a plane perpendicular to the first plane and coincident with a side surface of at least one of the support arms.
18. The structure of claim 11 , wherein the plurality of sheets and the plurality of support elements are metalized such that the entire structure is electrically conductive.
19. A method for insulating, comprising:
providing at least first and second sheets;
interconnecting a first surface of a first support element to the first sheet;
interconnecting a second surface of the first support element to the second sheet, wherein the first surface of the first support element is formed by a support platform, wherein the second surface of the support element is formed by a base platform, wherein the support platform is interconnected to the base platform by a plurality of spaced apart, angled and radially extending support arms, and wherein at least a first portion of the first sheet and at least a first portion of the second sheet are spaced apart from one another by the first support element.
20. The method of claim 19 , wherein the first support element includes a support beam that extends from the support platform, the method further comprising:
applying a compressive force, wherein the first sheet is forced towards the second sheet, wherein the radially extending support arms are flexed, and wherein the support beam is brought into contact with the second sheet.
21. The method of claim 20 , further comprising: removing the compressive force, wherein the support beam is moved out of contact with the second sheet.
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Also Published As
Publication number | Publication date |
---|---|
US20100252698A1 (en) | 2010-10-07 |
US8234835B2 (en) | 2012-08-07 |
WO2011002628A1 (en) | 2011-01-06 |
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