JPH0536187Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a temperature sensor that detects and notifies temperature rises caused by loosened cable connections and other abnormal temperatures of cables.

(Prior art) Conventionally, when detecting abnormal temperatures in this type of cable, members such as fuses and bimetals that change or deform as the temperature rises are installed in contact with the cable, and changes in these members, Depending on the deformation, appropriate electrical circuits were opened and closed, and electrical signals were communicated to the outside of the monitoring room etc. through a dedicated electrical circuit.

(Problems to be Solved by the Invention) However, according to this method, if it is installed near the bus bar, it will be affected by the current flowing through the bus bar and noise from the outside, causing malfunctions and lacking in reliability. Furthermore, since an electric line such as a lead wire is used, if the sensor device is installed close to a charging part, there is a risk that current will enter from the charging part and destroy the sensor device itself. Furthermore, if the detected electrical signal were to leak, there was a risk of causing an unexpected situation to other electrical equipment or cables.

These are caused by adopting a configuration in which the detected results are communicated to the outside through electrical signals.

(Means for solving the problem) This invention was made in view of the above points, and the basic configuration is based on FIG. 1. Under normal conditions, a certain amount of light from the optical fiber cable 1 A bimetal 5 that is deformed by heat from a conductor cable 4 is linked to a reflector plate 3 that reflects the light and sends it to another optical fiber cable 2. Considering the function of the reflector 3, the reflector referred to in this invention also refers to a prism, a mirror, etc.

Specifically speaking, it consists of an upper plate made of an insulating material, and a lower plate made of an insulating material on the lower surface of one side of the upper plate with an insulating spacer interposed between them. A hollow storage body made of insulating material is fixed to an appropriate location on the upper or lower plate, and inside this storage body,
A bimetal is provided that directly or indirectly contacts the object to be detected which is held between the upper plate or the lower plate, and a thin plate is provided at a distance from the bimetal. A main pillar that moves one end of the thin plate by deformation of the bimetal is movably supported between these bimetals and the thin plate, and a V-shaped mirror is mounted on the one end of the thin plate, and each mirror surface is accommodated. It is installed facing the inner wall of the body, and the side wall of the storage body has insertion ports for optical fiber cables facing each opposing mirror surface of the mirror, and optical fibers for emitting and receiving light are inserted into these insertion ports. Each end of the cable is fixed.

(Function) The object to be measured is held between the upper and lower plates made of insulating material, and as the temperature change of the object is conducted to the bimetal, the bimetal deforms and lifts the main pillar inside the housing. The main column lifts one of the sheets further, which causes a mirror attached to one swinging end of the sheet to move. This mirror is always irradiated with light from an optical fiber cable for emitting light, which is reflected and transmitted to an optical fiber cable for receiving light. As mentioned above, as the position of the mirror changes due to changes in the temperature of the object to be measured, the amount of light transmitted to the optical fiber cable for light reception changes, and as a result, it is possible to detect temperature rises and abnormal temperatures of the object to be measured. be.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

FIG. 3 is a plan view, and numeral 11 is a rectangular upper plate made of an insulating material. Below this upper plate 11, as shown in FIG.
2, attach the lower plate 13 made of insulating material to the screw 12a.
The upper plate 11 and lower plate 13 have a cable clamping function. Each upper plate 11 and lower plate 13
Spring plates 14 and 15 with high thermal conductivity are housed inside.

A substantially cylindrical storage body 16 made of an insulating material is fixed to an appropriate location on the upper plate 11 until it penetrates the spring plate 14, and a main pillar holding member 17 is provided inside the storage body 16. Further, a bimetal 18 is provided on the lower surface of this main pillar holding member. As is clear from the figure, the main pillar holding member 17 has a substantially truncated conical shape, and the main pillar 19 extends freely through the center thereof, and its lower end is in contact with the upper surface of the bimetal 18, while the upper end is in the shape of a truncated cone. A thin plate 20 having one end fixed to the inner wall of the body 16 and extending over the main column holding member 17
is in contact with the bottom surface of At an appropriate location on the other end of this thin plate 20, a flat V-shaped V-shaped mirror 21 with a folding angle of 90 degrees is installed with its opening facing toward the inner wall adjacent to the storage body 16. .

Insertion ports 22 and 23 for optical fiber cables are bored in the side wall of the storage body 16 at an angle of 45 degrees toward each of the opposing mirror surfaces of the V mirror 21, and furthermore, on the outside of the insertion ports 22 and 23, An optical fiber cable holding member 25 having plastic stick screws 24 and 25 on both sides for fixing the cable is fixedly located in the storage body 16. This holding member 25 has holes 26 and 27 for optical fiber cables that match the insertion openings 22 and 23 described above. An optical fiber cable (not shown) inserted into the holding member 25 is fixed to the holding member 25. Furthermore, a protrusion 2 is provided on the lower plate 13 at a position facing the storage body 16 to enhance the clamping function.
It is 8.

This embodiment has the structure as described above, and as is clear from the figure, this embodiment is used for a flat cable, and the flat cable to be measured for abnormal temperature is connected to the upper plate 11. The holes 26 and 27 of the holding member 25 are held between the lower plate 13 and the optical fiber cables from the separate light emitters and the optical fiber cables (not shown) leading to the receiver.
Insert and use each. When the temperature of the flat cable increases, the bimetal 18 warps upward as shown in FIG. 5, and the main column 19 is pushed up in the direction of the arrow in the figure, lifting the thin plate 20 upward. When the thin plate 20 is raised, the V-mirror 21 no longer reflects the light from the optical fiber cable 29, and the reflected light is interrupted, thereby allowing the temperature rise of the flat cable to be confirmed from the outside.

In this embodiment, spring plates 11 and 13 with high thermal conductivity are provided in the upper plate 11 and lower plate 13, respectively, so that a more sensitive detection function can be obtained. Due to the clamping structure, it can be easily set to the desired conductor cable. Furthermore, if the storage body 16 is free to rotate, the direction in which the optical fiber cable can be inserted can be selected.

In addition, all externally exposed members are made of insulating material, so they are not affected by the electrical effects of the conductor cable, and extremely accurate and safe operation can be expected.

(Effects of the invention) According to this invention, the temperature change of the object to be measured is detected by holding the object between the upper plate and the lower plate. Accurate detection is possible because objects come into direct or indirect contact with the bimetal. Moreover, it is highly reliable as there is no electrical influence from other objects or harmful effects due to noise. Furthermore, since no electric lines or electric signals are used, this invention has great practical effects, such as being able to be used close to charging parts, and is also excellent in safety.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of this invention, and Figure 3 is an illustration of this invention.
The figure is a plan view of the embodiment, and Figure 4 is A in Figure 3.
-A line sectional view, and FIG. 5 is a sectional view of the main part of the embodiment showing the operating condition. In the figure, 1 and 2 are optical fiber cables, 3 is a reflection plate, 4 is a conductor cable, and 5 is a bimetal.

Claims (1)

[Scope of utility model registration request] It consists of an upper plate made of an insulating material and a lower plate made of an insulating material with an insulating spacer placed on the lower surface of one side of the upper plate, and the object to be measured is held between the upper plate and the lower plate. A hollow storage body made of an insulating material is fixed to an appropriate location on the upper plate or the lower plate, and the inside of this storage body is in direct or indirect contact with the object to be detected held between the upper plate or the lower plate. A bimetal is provided, and a thin plate is provided at a distance from the bimetal, and this thin plate is supported in the storage body so that one end can swing freely. A main pillar that moves one end is movably supported, and a V-shaped mirror is installed at the one end of this thin plate with each mirror surface facing the inner wall of the storage body, and each of the mirrors is mounted on the side wall of the storage body. 1. A temperature sensor characterized in that insertion ports for optical fiber cables are formed toward opposing mirror surfaces, and one end of each of the optical fiber cables for light emission and light reception is fixed to these insertion ports.