CN217586112U - Piezoelectric fabric sensor and garment - Google Patents

Abstract

The utility model provides a piezoelectricity fabric sensor and clothing, wherein, piezoelectricity fabric sensor includes two electrically conductive yarn layers that set up relatively and sets up in two inflation yarn layer between the electrically conductive yarn layer, each electrically conductive yarn layer with all be provided with insulating yarn layer, two between the inflation yarn layer wear to be equipped with the PVDF monofilament between the electrically conductive yarn layer, the PVDF monofilament runs through two insulating yarn layer the inflation yarn layer, and with two the electrically conductive yarn layer switches on, two the electrode is all installed on the electrically conductive yarn layer. The utility model discloses a PVDF monofilament replaces conventional piezoelectric layer, and the PVDF monofilament is soft, and the bendability is strong, more is fit for being applied to the piezoelectricity fabric sensor, and the piezoelectricity fabric sensor is made into by the fabric, has good gas permeability, and the inflation yarn layer provides elasticity for the piezoelectricity fabric sensor, provides effectual space through the contact separation to improve the piezoelectric performance.

Description

Piezoelectric fabric sensor and garment

Technical Field

The utility model relates to a sensor technology field especially relates to a piezoelectric fabric sensor and clothing.

Background

Along with the rapid development of intelligent wearable equipment in domestic and foreign markets, the sensor on the intelligent wearable equipment is in urgent need of upgrading, the intervention treatment and full life cycle health management of the intelligent wearable fabric sensor equipment based on medical health data become the key word for future development of the intelligent wearable equipment, the intelligent wearable equipment also becomes a new technology for changing a medical system and human health, but most of the traditional sensors are solid-state sensor layer structures, the hardness of the traditional sensors is high, the traditional sensors are not easy to bend, and the traditional sensors cannot be applied to the intelligent wearable equipment.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a piezoelectricity fabric sensor and clothing aims at solving the big not easily crooked problem of current sensor hardness.

In order to achieve the above object, the utility model provides a piezoelectric fabric sensor, including relative two electrically conductive yarn layers that set up and set up in two inflation yarn layer between the electrically conductive yarn layer, each electrically conductive yarn layer with all be provided with insulating yarn layer, two between the inflation yarn layer wear to be equipped with the PVDF monofilament between the electrically conductive yarn layer, the PVDF monofilament runs through two insulating yarn layer inflation yarn layer, and with two the electrically conductive yarn layer switches on, two the electrode is all installed on the electrically conductive yarn layer.

Preferably, said PVDF monofilaments are interleaved alternately between two of said layers of conductive yarns.

Preferably, the conductive yarn layer is made of silver plated conductive nylon filament weaving.

Preferably, the silver-plated conductive nylon filament has the specification of 140D/48F and the resistance value of 4-6 omega/cm.

Preferably, the insulating yarn layer is woven by polyester yarns.

Preferably, the specification of the polyester yarn is 210D/3.

Preferably, the thickness of the expanded yarn layer is 2mm to 4mm.

Preferably, the PVDF monofilament is a round monofilament with the diameter of 0.08 mm-0.15 mm.

Preferably, the expanded yarn layer is woven from polyester yarns.

The utility model also provides a clothing, the clothing is used to have foretell piezoelectricity fabric sensor.

The technical scheme of the utility model, through the outmost of electrically conductive yarn layer conduct piezoelectricity fabric sensor, set up insulating yarn layer in the inboard on electrically conductive yarn layer, with the surperficial relative insulation on electrically conductive yarn layer, prevent under pressure shock, piezoelectricity fabric sensor deformation leads to two electrically conductive yarn layer direct contact, forms the short circuit, influences piezoelectricity fabric sensor's detection. An expansion yarn layer is arranged between the insulating yarn layers and provides elasticity for the piezoelectric fabric sensor, so that the piezoelectric fabric sensor can be restored in time after being deformed, and an effective space is provided through contact separation, so that the piezoelectric performance is improved; the long-term use can lead to the electrically conductive yarn layer wearing and tearing back end of a thread loose, thereby the end of a thread is loose can connect two electrically conductive yarn layers and lead to the short circuit, therefore the inflation yarn layer still plays the reinforcement piezoelectricity fabric sensor, the effect on isolated two electrically conductive yarn layers, replaces conventional piezoelectric layer through the PVDF monofilament, switches on two electrically conductive yarn layers, the PVDF monofilament is soft, and can buckle the nature by force, more is fit for being applied to the fabric sensor.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a piezoelectric fabric sensor according to a first embodiment of the present invention;

fig. 2 is a schematic diagram of a piezoelectric fabric sensor according to a second embodiment of the present invention;

fig. 3 is a schematic structural view of a piezoelectric fabric sensor according to a third embodiment of the present invention;

fig. 4 is a schematic flow chart illustrating a method for manufacturing a piezoelectric fabric sensor according to a fourth embodiment of the present invention;

fig. 5 is a schematic flow chart of a method for manufacturing a piezoelectric fabric sensor according to a fifth embodiment of the present invention.

The reference numbers illustrate:

the purpose of the present invention is to provide a novel and improved method and apparatus for operating a computer.

Detailed Description

The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, back \8230;) in the present embodiment are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the figure), and if the specific posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions in the present application as to "first," "second," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "secured" are to be construed broadly, and thus, for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1, the present invention provides a piezoelectric fabric sensor 1, including two conductive yarn layers 10 that are arranged relatively and an expansion yarn layer 30 that is arranged between the two conductive yarn layers 10, an insulating yarn layer 20 is arranged between each conductive yarn layer 10 and the expansion yarn layer 30, a PVDF monofilament 40 is arranged between the two conductive yarn layers 10, the PVDF monofilament 40 runs through the expansion yarn layer 30 and the two insulating yarn layers 20, and switches on the two conductive yarn layers 10, and electrodes 50 are arranged on the two conductive yarn layers 10.

Referring to fig. 1, in order to facilitate understanding, two conductive yarn layers 10 are respectively described as a first conductive yarn layer 11 and a second conductive yarn layer 12, and two insulating yarn layers 20 are respectively described as a first insulating yarn layer 21 and a second insulating yarn layer 22, the present invention provides a piezoelectric fabric sensor 1, including a first conductive yarn layer 11, a second conductive yarn layer 12, and an expansion yarn layer 30 disposed between the first conductive yarn layer 11 and the second conductive yarn layer 12, which are disposed oppositely, a first insulating yarn layer 21 is disposed between the first conductive yarn layer 11 and the expansion yarn layer 30, a second insulating yarn layer 22 is disposed between the second conductive yarn layer 12 and the expansion yarn layer 30, a PVDF monofilament 40 is disposed between the first conductive yarn layer 11 and the second conductive yarn layer 12, the PVDF monofilament 40 penetrates through the first insulating yarn layer 21, the second insulating yarn layer 22 and the expansion yarn layer 30, and conducts the first conductive yarn layer 11 and the second conductive yarn layer 12, and electrodes 50 are mounted on the first conductive yarn layer 11 and the second conductive yarn layer 12.

Referring to fig. 1, in general, a piezoelectric fabric sensor 1 includes a first conductive yarn layer 11, a first insulating yarn layer 21, an expansion yarn layer 30, a second insulating yarn layer 22, a second conductive yarn layer 12, and a PVDF monofilament 40 disposed between the first conductive yarn layer 11 and the second conductive yarn layer 12 from top to bottom, which form a three-dimensional sensor.

The technical scheme of the utility model, through electrically conductive yarn layer 10 as piezoelectric fabric sensor 1's outmost, set up insulating yarn layer 20 in electrically conductive yarn layer 10's inboard, it is relatively insulating with electrically conductive yarn layer 10's surface, prevent under pressure shock, piezoelectric fabric sensor 1 deformation leads to first electrically conductive yarn layer 11 and the electrically conductive yarn layer 12 direct contact of second, forms the short circuit, influences piezoelectric fabric sensor 1's detection. An expansion yarn layer 30 is arranged between the insulating yarn layers 20, and the expansion yarn layer 30 provides elasticity for the piezoelectric fabric sensor 1, so that the piezoelectric fabric sensor 1 can be restored in time after being deformed, an effective space is provided through contact separation, and the piezoelectric performance is improved; the long-term use can lead to the electrically conductive yarn layer 10 to wear out the back end of a thread loose, the end of a thread is loose and can connect first electrically conductive yarn layer 11 and second electrically conductive yarn layer 12 thereby leading to the short circuit, consequently, inflation yarn layer 30 still plays the effect of consolidating piezoelectric fabric sensor 1, the effect of isolated first electrically conductive yarn layer 11 and second electrically conductive yarn layer 12, replace conventional piezoelectric layer through PVDF monofilament 40, switch on first electrically conductive yarn layer 11 and second electrically conductive yarn layer 12, PVDF monofilament 40 is soft, the bending nature is strong, more be fit for being applied to piezoelectric fabric sensor 1, whole piezoelectric fabric sensor 1 is made by the fabric simultaneously, can guarantee good gas permeability and steam permeability at the in-process of dressing.

It is to be noted that when pressure is applied to the piezo-electric textile sensor 1, the electric dipole formed by the separation of the charge centers on the PVDF in the intermediate layer and the electric dipole moment are changed, resulting in the formation of a voltage potential between the electrodes 50, rather than so-called direct conduction. Referring to fig. 2, fig. 2 shows four states of the working process of the piezo-electric textile sensor 1, fig. 2a: in the initial state and the undisturbed state, charge centers of cations and anions are superposed with each other, and no polarization phenomenon exists in the piezoelectric material. FIG. 2b: when pressure is applied, deformation of the piezo fabric produces a negative strain and a reduction in volume. The separation of the charge centers forms an electric dipole and the electric dipole moment changes, resulting in a pressure potential between the electrodes 50. If the electrode 50 is connected to an external load, the voltage potential will drive electrons through the external circuit to partially shield the voltage potential to achieve a new equilibrium state. Thus, the mechanical energy is converted into electrical energy. FIG. 2c: when the two conductive fabric electrodes 50 are fully in contact, the polarization density reaches a maximum squeezed state. FIG. 2d: when the external force is released, the electrons flow back, rebalancing the charge induced by the strain relief under short circuit conditions. If the voltage potential is continuously changed by the reciprocating strain phenomenon, a stable pulse current flows through an external circuit.

In one embodiment, PVDF monofilaments 40 are interleaved between the first and second layers of conductive yarns 11, 12. The PVDF monofilaments 40 are alternately inserted between the first conductive yarn layer 11 and the second conductive yarn layer 12, so that the three-dimensional structure of the piezoelectric fabric sensor 1 is firmer, the sensor is effectively supported, and the wear resistance and the service life of the sensor are improved.

It is understood that the number of PVDF filaments 40 can be multiple, and referring to fig. 3, in one embodiment, the number of PVDF filaments 40 is 4, and four PVDF filaments 40 are spaced apart at the same distance and pass through the first conductive yarn layer 11 at a predetermined angle and pass out of the second conductive yarn layer 12 at a predetermined angle.

In one embodiment, the conductive yarn layer 10 is woven from silver plated conductive nylon filaments. The conductive yarn adopts silver-plated conductive nylon filament, the toughness of nylon filament is good, has higher tensile strength, compressive strength and wearability, and nylon filament density is little simultaneously, and is frivolous, is applicable to as piezoelectric fabric sensor 1's outermost layer material, and silver-plating on the nylon filament makes it possess the conductivity, and conductive yarn layer 10 is the outermost fabric simultaneously, needs and skin direct contact, and silver-plating can play antibiotic bactericidal effect, effectively prevents the skin allergy and the infection that fabric sensor arouse.

In one embodiment, the silver-plated conductive nylon filament has a specification of 140D/48F and a resistance value of 4-6 omega/cm. Wherein D is the titer, 140D is the gram number of the silver-plated conductive nylon filament per 9000m of length at a official moisture regain of 140g, and F is the number of strands, which represents that the silver-plated conductive nylon filament is composed of 48 strands of filaments, and multiple experiments show that the silver-plated conductive nylon filament adopting 140D/48F can obtain a softer and more stable conductive yarn layer 10. The resistance value is 4-6 omega/cm, and the piezoelectric property of the piezoelectric fabric sensor 1 can be enhanced by selecting a proper resistance value.

In an embodiment, the expansion yarn layer 30 is woven by polyester yarns, the polyester yarns have high strength, good wear resistance and good elasticity, the elasticity is close to wool, when the elongation is 5% -6%, the polyester yarns can be almost completely recovered, the wrinkle resistance exceeds other fibers, namely, the fabric is not creased, the size stability is good, and the function of providing space for separation contact, which is required by the expansion yarn layer 30, can be ensured

In one embodiment, insulating yarn layer 20 is woven from polyester yarn. The polyester yarn has high strength and good wear resistance, and the molecules of the polyester yarn are combined by covalent bonds and can not transmit electrons, so that the polyester yarn is also suitable for being used as the material of the insulating yarn layer 20.

In one embodiment, the polyester yarn has a yarn size of 210D/3. Where 210D, the grams per 9000m length of silver plated conductive nylon filament at official moisture regain, was 210g, and 3 indicated a 3 strand filament composition. The polyester yarn with the specification of 210D/3 can obtain higher strength and durability.

In one embodiment, the thickness of the layer of expanded yarns 30 is between 2mm and 4mm; and/or the PVDF monofilament 40 is a round monofilament with a diameter of 0.08mm to 0.15mm. The expanded yarn layer 30, which serves as a buffer layer, is too thin to achieve the effects of providing an effective space through contact separation and isolating the first conductive yarn layer 11 and the second conductive yarn layer 12, is too thick to affect the piezoelectric performance, and thus the thickness is set at 2mm to 4mm, preferably 3mm. The PVDF monofilament 40 of an appropriate diameter is selected to help improve its piezoelectric performance, and therefore is set to have a diameter of 0.08mm to 0.15mm, preferably 0.1mm.

The utility model also provides a clothing, the clothing is used and is had foretell piezoelectricity fabric sensor 1. The specific structure of the piezoelectric fabric sensor 1 refers to the above embodiments, and since the garment adopts all technical solutions of all the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and details are not repeated here.

The utility model also provides a method for making piezoelectric fabric sensor for make foretell piezoelectric fabric sensor, including following step:

s100, weaving to obtain two conductive yarn layers;

s200, weaving one side of each conductive yarn layer facing to the other conductive yarn layer to obtain the insulating yarn layer;

s300, weaving between the two insulating yarn layers to obtain an expansion yarn layer;

s400, weaving the PVDF monofilaments between the two conductive yarn layers, and enabling the PVDF monofilaments to penetrate through the expansion yarn layer and the two insulating yarn layers;

and S500, respectively connecting the two electrodes to the two conductive yarn layers.

Since the manufacturing method adopts all technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and details are not repeated herein.

In one embodiment, the step of weaving PVDF monofilaments between the first and second layers of conductive yarns comprises:

s410, penetrating the PVDF monofilaments from one conductive yarn layer in an alternating mode, sequentially penetrating one insulating yarn layer, the expanded yarn layer and the other insulating yarn layer, and correspondingly penetrating out of the other conductive yarn layer.

The PVDF monofilaments are alternately arranged between the two conductive yarn layers in a penetrating mode, so that the stability and the piezoelectric performance of a three-dimensional structure can be enhanced, and the sensor is effectively supported.

Illustratively, in one embodiment, the weaving is done using Shima Seiki SVR-SP 14G island essence, 14 needles density, 36 inches (92 cm) machine width, polyester yarn (210D/3), silver plated conductive nylon filaments (140D/48F), PVDF monofilaments (0.1 mm) and bulked yarn. In the weaving process, 200 needles are respectively used by the front machine tool and the rear machine tool, three silver-plated conductive nylon filaments and two polyester yarns are used by the first row and the second row, the expanded yarn is used by the third row, and one PVDF monofilament is respectively used by the fourth row to the seventh row. The specific weaving steps are as follows:

the first row carries out full-needle looping knitting on the front machine plate without turning over needles (knitting plating motion is carried out by using a second yarn nozzle and a third yarn nozzle at the same time);

weaving to form a first conductive yarn layer and a first insulating yarn layer;

the second row carries out full-needle loop knitting on the rear machine plate without turning over needles (knitting plating motion is carried out simultaneously by using a five-gauge yarn nozzle and a six-gauge yarn nozzle);

weaving to form a second conductive yarn layer and a second insulating yarn layer;

the third line performs yarn clamping action;

weaving to obtain an expanded yarn layer;

in the fourth row, the front machine plate is knitted by one-third tuck, the back machine plate is knitted by one-third tuck by staggering two needles, and the automatic needle turning action is cancelled;

in the fifth row, tuck knitting is carried out at the position of the rear machine plate corresponding to the front machine plate of the rear machine plate in the third row, tuck knitting is carried out at the position of the front machine plate corresponding to the rear machine plate in the third row by staggering two needles, and automatic needle turning action is cancelled;

repeating the fourth row action by staggering one needle in the sixth row;

repeating the fifth row action by staggering one needle in the seventh row;

threading PVDF monofilaments;

and returning to execute the first action until knitting is finished.

The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. The utility model provides a piezoelectricity fabric sensor, its characterized in that, including relative two electrically conductive yarn layers that set up and set up in two inflation yarn layer between the electrically conductive yarn layer, each electrically conductive yarn layer with all be provided with insulating yarn layer between the inflation yarn layer, two wear to be equipped with the PVDF monofilament between the electrically conductive yarn layer, the PVDF monofilament runs through inflation yarn layer and two insulating yarn layer, and with two the electrically conductive yarn layer switches on, two the electrode is all installed to the electrically conductive yarn layer.

2. The piezoelectric fabric sensor of claim 1, wherein the PVDF monofilaments are interleaved between two of the layers of conductive yarn.

3. The piezoelectric fabric sensor of claim 1, wherein the conductive yarn layer is woven from silver plated conductive nylon filaments.

4. The piezoelectric fabric sensor according to claim 3, wherein the silver-plated conductive nylon filament has a gauge of 140D/48F and a resistance value of 4-6 Ω/cm.

5. The piezoelectric fabric sensor of claim 1, wherein the insulating yarn layer is woven from polyester yarn.

6. The piezoelectric fabric sensor of claim 5, wherein the polyester yarn gauge is 210D/3.

7. The piezoelectric fabric sensor of any one of claims 1-6, wherein the layer of intumescent yarn has a thickness of 2mm to 4mm.

8. The piezoelectric fabric sensor of any one of claims 1-6, wherein the PVDF monofilaments are round monofilaments having a diameter of 0.08mm to 0.15mm.

9. The piezoelectric fabric sensor of any one of claims 1-6, wherein the layer of intumescent yarn is woven from polyester yarn.

10. A garment, characterized in that the garment is applied with a piezo-electric fabric sensor according to any of claims 1-9.

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