JP6702510B1 - Temperature detector - Google Patents

Abstract

The temperature detecting device is arranged inside the silo, and includes an optical fiber having a forward optical fiber portion, a folded portion, and a return optical fiber portion, the forward optical fiber portion from one end side in the axial direction of the silo. Extending toward the other end side, the folded-back portion has a curved shape, is integrally connected to the end portion of the forward path side optical fiber portion, the return path side optical fiber portion, the other end in the axial direction of the silo. Side to one end side, and is integrally connected to the end of the folded-back portion.

Description

The present invention relates to a temperature detecting device.

BACKGROUND ART Conventionally, a temperature sensor using a thermocouple has been known as a temperature detection device for detecting temperature (see Patent Document 1). Further, a temperature detecting device that detects a temperature using an optical fiber is also known (see Patent Document 2). In patent document 1, the circumference|surroundings of the sheath thermocouple arrange|positioned inside the coal storage tank are enclosed with the wire rope. In Patent Document 2, an optical fiber extending along the belt conveyor is provided to detect the temperature of coal on the belt conveyor.

Japanese Patent No. 5274511 JP-A-7-296274

There is a demand for a temperature detecting device that detects the temperature of an object contained in a silo using an optical fiber.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a temperature detection device that detects the temperature of an object housed inside a silo using an optical fiber.

The temperature detecting device according to the present invention is provided inside the silo, and includes an optical fiber having an outward optical fiber portion, a folded portion, and a return optical fiber portion, and the outward optical fiber portion is an axial direction of the silo. From one end side toward the other end side, the folded-back portion has a curved shape, is integrally connected to the end portion of the forward path optical fiber portion, the return path optical fiber portion, the axis of the silo. It extends toward the one end side from the other end side in the direction, and is integrally connected to the end portion of the folded portion.

According to the present invention, an optical fiber can be used to detect the temperature of an object contained in the silo.

FIG. 1 is a schematic diagram showing a temperature detection system according to the first embodiment of the present invention. FIG. 2 is an enlarged schematic view of the main part of FIG. FIG. 3 is a schematic diagram near the bottom of the optical fiber according to the second embodiment. FIG. 4 is a schematic diagram near the bottom of the optical fiber according to the third embodiment. FIG. 5 is a schematic diagram near the bottom of the optical fiber according to the fourth embodiment. FIG. 6 is a schematic diagram near the bottom of the optical fiber according to the fifth embodiment. FIG. 7 is a sectional view of the first jig shown in FIG. FIG. 8 is a sectional view taken along the line VIII-VIII of FIG. 7. FIG. 9 is a side view of the second jig shown in FIG. FIG. 10 is a plan view of FIG. 9 viewed from the A direction. FIG. 11 is a front view of FIG. 9 viewed from the B direction. FIG. 12 is a schematic diagram showing a state in which an optical fiber is wound around the outer circumference of the second jig. FIG. 13 is a schematic view showing a state in which the optical fiber is wound around the outer circumference of the second jig. FIG. 14 is a schematic diagram showing a state in which an optical fiber is wound around the outer circumference of the second jig.

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the disclosure is merely an example, and a person having ordinary skill in the art can easily think of an appropriate modification while keeping the gist of the invention, and is naturally included in the scope of the invention. Further, in order to make the description clearer, the drawings may schematically show the width, thickness, shape, etc. of each part as compared with the actual mode, but this is merely an example, and the interpretation of the present invention will be understood. It is not limited.

In the specification and the drawings, the same elements as those described above with reference to the drawings already described are denoted by the same reference numerals, and detailed description thereof may be appropriately omitted. In the following description, the vertical direction will be referred to as the silo axial direction.

[First Embodiment]
First, a first embodiment of the present invention will be described. FIG. 1 is a schematic diagram showing a temperature detection device according to the first embodiment of the present invention.

In each of the following embodiments, the temperature inside the silo is detected using an optical fiber, but this principle will be briefly described. When pulsed light is incident on the optical fiber, the pulsed light slightly scatters inside the optical fiber and progresses while becoming various scattered lights. Since Raman scattered light, which is one of the scattered lights, has temperature dependence, the temperature is detected by detecting the Raman scattered light.

The temperature detection device 1 according to the first embodiment has, for example, an optical fiber arranged inside a silo. In detail, the optical fiber 10 includes a first division unit 11, a second division unit 12, a third division unit 13, a fourth division unit 14, a fifth division unit 15, and a sixth division unit 16. , With. Although not shown, the first silo 31 and the second silo 32 are provided with a contained material such as coal or grain.

In the first division portion 11, the end portion 11a on the downstream side in the light traveling direction and the end portion 12a on the upstream side in the light traveling direction in the second division portion 12 are fused and connected at a fusion point. .. The fusing point is arranged inside the first fusing box 21. In the second division portion 12, the end portion 12b on the downstream side in the light traveling direction and the end portion 13a on the upstream side in the light traveling direction in the third division portion 13 are fused and connected at a fusion point. .. The fusion point is arranged inside the second fusion box 22. In the third division portion 13, the end portion 13b on the downstream side in the light traveling direction and the end portion 14a on the upstream side in the light traveling direction in the fourth division portion 14 are fused and connected at a fusion point. .. The fusion point is arranged inside the second fusion box 22.

In the fourth division portion 14, the end portion 14b on the downstream side in the light traveling direction and the end portion 15a on the upstream side in the light traveling direction in the fifth division portion 15 are fused and connected at a fusion point. .. The fusing point is arranged inside the first fusing box 21. In the fifth division portion 15, the end portion 15b on the downstream side in the light traveling direction and the end portion 16a on the upstream side in the light traveling direction in the sixth division portion 16 are fused and connected at a fusion point. .. The fusing point is arranged inside the first fusing box 21. An end portion 16b on the downstream side in the light traveling direction of the sixth division portion 16 is connected to a measuring device (not shown).

The measuring device includes, for example, a CPU (Central Processing Unit) that is an example of a processor, a memory that is an example of a storage unit that stores programs and data executed by the CPU, and a display unit that is an example of an output unit that outputs a measurement result. Have.

In this embodiment, there are two (plural) first silos 31 and second silos 32. The third dividing portion 13 is arranged inside the first silo 31. The fifth dividing portion 15 is arranged inside the second silo 32.

FIG. 2 is an enlarged schematic view of the main part of FIG. More specifically, it is an enlarged schematic view of a lower portion of the third division portion 13 arranged near the bottom portion of the first silo 31. Note that the lower portion of the fifth division portion 15 arranged near the bottom portion of the second silo 32 also has the same shape.

The optical fiber of the third division portion 13 has a forward optical fiber portion 100, a turnback portion 200, and a backward optical fiber portion 300. The forward path optical fiber section 100, the turnback section 200, and the return path optical fiber section 300 are integrally connected.

As shown in FIGS. 1 and 2, the outward optical fiber unit 100 extends from the upper end side to the lower end side of silos (first silo 31 and second silo 32) extending in the up-down direction. That is, the outward optical fiber portion 100 extends from one end side (upper end side) of the silo in the axial direction (vertical direction) toward the other end side (lower end side).

The folding|returning part 200 has a curved shape. Specifically, the curved shape is a U-shape. The folded-back portion 200 may have a J-shape. An upper end 201 of the folded-back portion 200 is integrally connected to a lower end 101 of the outward optical fiber portion 100.

The return path optical fiber portion 300 extends from the lower end side of the silo extending in the vertical direction toward the upper end side. That is, the silo extends from the other end side (lower end side) in the axial direction toward one end side (upper end side). The upper end 202 of the folded-back portion 200 is integrally connected to the lower end 301 of the backward optical fiber portion 300.

As described above, the temperature detection device 1 according to the present embodiment is arranged inside the silo (first silo 31, second silo 32), and the forward path optical fiber section 100, the turnback section 200, and the return path optical fiber. An optical fiber 10 having a section 300 is provided. The outward optical fiber portion 100 extends from one end side (upper end side) in the axial direction of the silo toward the other end side (lower end side), and the folded-back portion 200 has a curved shape. The optical fiber unit 300 on the return path side extends from the other end side (lower end side) in the axial direction of the silo toward one end side (upper end side) and is integrally connected to the end part of the folded portion 200. ..

The optical fiber 10 has the characteristics of excellent temperature detection accuracy, responsiveness, and stability. In the temperature detecting device 1 according to the present embodiment, the optical fiber 10 is arranged inside the silo, so that the temperature of the contained object accommodated inside the silo can be detected using the optical fiber 10. Therefore, it is possible to detect the temperature of the contents of the silo with high accuracy and high responsiveness and stability. A conveyor (not shown) is arranged below the silo, and the stored items in the silo that have reached a high temperature are discharged from the bottom of the silo and conveyed by the conveyor, whereby the stored items can be cooled.

The folding|returning part 200 is arrange|positioned at the bottom part of a silo (1st silo 31, 2nd silo 32). Since the optical fiber 10 is arranged over the entire length of the silo in the axial direction, it is possible to detect the temperature of almost the entire inside of the silo. In addition, since the portion arranged at the bottom of the silo is the portion to which the load is applied most in the optical fiber 10, the damage of the optical fiber 10 can be suppressed by arranging the curved folded-back portion 200 in the portion. ..

The folded-back portion 200 is curved in a U shape in a side view. In the U-shaped shape, the optical fiber 10 is less likely to be damaged because there are few regions where stress is locally concentrated.

A plurality (two) of silos (first silo 31 and second silo 32) are provided, an optical fiber 10 is provided for each silo, and the optical fibers 10 are connected to each other. According to this, temperature management can be performed with one optical fiber 10 for a plurality of silos.

The contained material in the silo (first silo 31, second silo 32) is coal. According to this, coal is apt to become hot and spontaneously ignites. Therefore, fire or the like can be prevented in advance by controlling the temperature with high accuracy by the optical fiber 10.

[Second Embodiment]
Next, the optical fiber according to the second embodiment will be described. FIG. 3 is a schematic diagram near the bottom of the optical fiber according to the second embodiment.

The second embodiment shows a mode in which two optical fibers are arranged inside one silo. The two optical fibers are a first optical fiber 41 and a second optical fiber 42. The 1st optical fiber 41 has the same shape as the optical fiber 10 of the 3rd division part 13 shown in FIG. That is, the first optical fiber 41 has the forward path side optical fiber section 411, the folding section 412, and the return path side optical fiber section 413 which are integrally connected. Further, the second optical fiber 42 has a forward path side optical fiber section 421, a folded section 422, and a return path side optical fiber section 423 which are integrally connected. The height positions of the lower ends of the first optical fiber 41 and the second optical fiber 42 are substantially the same.

As described above, the plurality of optical fibers 10 (two) are provided for one silo. According to this, even when one optical fiber is broken, another optical fiber can be reconnected and used.

[Third Embodiment]
Next, the optical fiber according to the third embodiment will be described. FIG. 4 is a schematic diagram near the bottom of the optical fiber according to the third embodiment. In the third embodiment, a bending member is provided.

As shown in FIG. 4, the bending member 50 has disk portions 51 and 52 and a cylindrical portion 53. The outer diameters of the disk portions 51 and 52 are larger than the outer diameter of the cylindrical portion 53. Two disk portions 51 and 52 are arranged apart from each other along the axial direction (left-right direction) of the cylindrical portion 53. The two disk portions 51, 52 are connected to each other by the cylindrical portion 53. The two disk portions 51 and 52 and the cylindrical portion 53 are coaxial. The folded-back portion 200 in the optical fiber 10 of the third divided portion 13 described in FIG. 2 is wound around the outer circumference of the cylindrical portion 53. The folded-back portion 200 may be tightly wound around the outer periphery of the cylindrical portion 53 without any clearance, or the folded-back portion 200 may be wound around the outer periphery of the cylindrical portion 53 with some clearance.

As described above, in the present embodiment, the bending member 50 having the shape of the folded-back portion 200 is arranged on the inner peripheral side of the folded-back portion 200 of the optical fiber 10.

According to this, even when the folded-back portion 200 is pushed by the contained object, the shape of the folded-back portion 200 is held by the bending member 50, so that the optical fiber 10 is less likely to be damaged.

Further, the folded-back portion 200 is wound around the bending member 50. Therefore, even when the folded-back portion 200 is pushed by the contained item, the folded-back portion 200 is unlikely to come off from the bending member 50, so that the optical fiber 10 is less likely to be damaged.

[Fourth Embodiment]
Next, the optical fiber according to the fourth embodiment will be described. FIG. 5 is a schematic diagram near the bottom of the optical fiber according to the fourth embodiment. In the fourth embodiment, a bending member is provided.

As shown in FIG. 5, the bending member 60 has disk portions 61, 62, 63 and a cylindrical portion 64. The outer diameters of the disk portions 61, 62, 63 are larger than the outer diameter of the cylindrical portion 64. Three disk portions 61, 62, 63 are arranged apart from each other along the axial direction (left-right direction) of the cylindrical portion 64. That is, the first disc portion 61, the second disc portion 62, and the third disc portion 63 are connected by the cylindrical portion. The first disc portion 61, the second disc portion 62, the third disc portion 63, and the cylindrical portion 64 are coaxial.

The three disk portions 61, 62, 63 are arranged at equal intervals along the axial direction of the cylindrical portion 64. The folded-back portions 412 and 422 of the first optical fiber 41 and the second optical fiber 42 described in FIG. 3 are wound around the outer circumference of the cylindrical portion 64. More specifically, the folded-back portion 422 of the second optical fiber 42 is disposed between the first disc portion 61 and the second disc portion 62, and the folded-back portion 412 of the first optical fiber 41 corresponds to the second disc portion 62. It is arranged between the third disc portion 63 and the third disc portion 63. The folded-back portions 412 and 422 may be closely wound around the outer periphery of the cylindrical portion 64 without any clearance, or the folded-back portions 412 and 422 may be wound around the outer periphery of the cylindrical portion 64 with a slight clearance. Good.

As described above, in the present embodiment, the plurality of optical fibers (the first optical fiber 41 and the second optical fiber 42) are wound around one bending member 60. According to this, even when both the first optical fiber 41 and the second optical fiber 42 press the folded-back portions 412 and 422 with the contained items, the folded-back portions 412 and 422 are less likely to come off the bending member 60, and thus the first optical fiber 41 The optical fiber 41 and the second optical fiber 42 are less likely to be damaged.

[Fifth Embodiment]
Next, the optical fiber according to the fifth embodiment will be described. FIG. 6 is a schematic diagram near the bottom of the optical fiber according to the fifth embodiment. FIG. 7 is a sectional view of the first jig shown in FIG. FIG. 8 is a sectional view taken along the line VIII-VIII of FIG. 7. FIG. 9 is a side view of the second jig shown in FIG. FIG. 10 is a plan view of FIG. 9 viewed from the A direction. FIG. 11 is a front view of FIG. 9 viewed from the B direction. FIG. 12 is a schematic diagram showing a state in which the optical fiber is wound around the outer circumference of the second jig. FIG. 13 is a schematic view showing a state in which the optical fiber is wound around the outer circumference of the second jig. FIG. 14 is a schematic diagram showing a state in which an optical fiber is wound around the outer circumference of the second jig. In the fifth embodiment, a bending member is provided.

As shown in FIG. 6, the bending member 70 includes a first jig 71, a second jig 72, a main body cover 73, a tip cover 74, and a wire rope 75. The second jig 72 is fixed to the first jig 71 via a fixing member (not shown). The wire rope 75 is arranged on the outer peripheral side of the small diameter portion 711 of the first jig 71. A cylindrical main body cover 73 is arranged on the outer peripheral side of the first jig 71 and the second jig 72, and the lower end portions of the first jig 71 and the second jig 72 are covered with a tip cover 74. By tightening the main body cover 73 with an annular band (not shown), the wire rope 75 is compressed and tightened from the outer peripheral side of the small diameter portion 711 of the first jig 71. The tip cover 74 has, for example, a hemispherical shape. The body cover 73 has, for example, a cylindrical shape.

As shown in FIGS. 7 and 8, the first jig 71 has a small diameter portion 711 and a large diameter portion 712. The small diameter part 711 and the large diameter part 712 are integrated. The outer peripheral surface 711a of the small diameter portion 711 is a cylindrical surface. The outer peripheral surface 712a of the large diameter portion 712 is a cylindrical surface. A through hole extending in the central axis direction is provided inside the first jig 71. This through hole includes a first through hole 713, a second through hole 714, and a third through hole 715. The inner diameter of the first through hole 713 is smaller than the inner diameter of the third through hole 715. The second through hole 714 is arranged between the first through hole 713 and the third through hole 715. The inner diameter of the second through hole 714 gradually increases from the first through hole 713 to the third through hole 715. That is, the inner peripheral surface of the second through hole 714 is a truncated cone-shaped tapered surface. Two mounting holes 716 are provided through the outer peripheral surface 712a of the large diameter portion 712 along the central axis direction. The material of the first jig 71 is preferably a material having high corrosion resistance such as polytetrafluoroethylene (PTFE), but is not limited to this and various materials can be applied.

The second jig 72 will be described with reference to FIGS. 9 to 11. The second jig 72 has a substantially elliptical shape when viewed from the side. The second jig 72 has main body portions 721 and 722 and an intermediate portion 723. As shown in FIG. 11, the main body 721 and the main body 722 are arranged to be separated from each other in the left-right direction on the paper surface of FIG. 11. An intermediate portion 723 is provided between the main body 721 and the main body 722. The main body 721 has a flange 7211 over the entire circumference when viewed from the side, as shown in FIG. 9. The outer peripheral edge 7211a of the flange 7211 has a substantially elliptical shape when viewed from the side. The main body portion 722 has a flange 7221 over the entire circumference as shown in FIG. The outer peripheral edge 7221a of the flange 7221 has a substantially elliptical shape when viewed from the side. The outer periphery 723a of the intermediate portion 723 also has a substantially elliptical shape when viewed from the side. The outer circumference 723a of the intermediate portion 723 is arranged on the inner circumference side of the outer peripheral edge 7211a and the outer peripheral edge 7221a. Therefore, the groove is constituted by the flange 7221, the outer periphery 723a of the intermediate portion 723, and the flange 7221.

As shown in FIGS. 13 and 14 described later, the optical fiber 10 is wound around the groove. In addition, two through holes 724 penetrating the main body portion 721, the main body portion 722, and the intermediate portion 723 are arranged along the longitudinal direction. The through hole 724 is arranged corresponding to the mounting hole 716 of the first jig 71. That is, the through hole 724 and the mounting hole 716 are aligned with each other, and a fastener such as a bolt is passed through the through hole 724 and the mounting hole 716 to be fastened, whereby the first jig 71 and the second jig 72 are connected. Can be concluded. The material of the second jig 72 is preferably an aluminum alloy having high corrosion resistance such as JIS A5052, but the material is not limited to this and various materials can be applied.

A state in which the folded-back portion 200A of the optical fiber 10 is wound around the outer circumference of the second jig 72 will be described with reference to FIGS. 12 to 14. In the present embodiment, the folded-back portion 200A is wound around the second jig 72 a plurality of times.

As described with reference to FIGS. 9 to 11, the flange 7211, the outer circumference 723 a of the intermediate portion 723, and the flange 7221 form a groove. Therefore, as shown in FIGS. 12 to 14, the folded portion 200A of the optical fiber 10 is wound around the groove a plurality of times. The number of windings is not limited. The folded-back portion 200A may be tightly wound around the outer circumference 723a of the intermediate portion 723 without a gap, or the folded-back portion 200A may be wound around the outer circumference 723a with a slight gap.

As described above, in the present embodiment, the folded-back portion 200A is wound around the second jig 72 of the bending member 70 a plurality of times. Therefore, even when the folded-back portion 200A is pushed by the contained object, the folded-back portion 200A is unlikely to come off from the bending member 70, so that the optical fiber 10 is less likely to be damaged.

Further, the first jig 71 is arranged on the outer peripheral side of the second jig 72. Therefore, the first jig 71 protects the second jig 72 and the folded portion 200A. Specifically, it is possible to prevent the second jig 72 and the folded portion 200A from coming into contact with the wire rope 75 and being damaged.

The body cover 73 and the tip cover 74 protect the first jig 71, the second jig 72, and the folded portion 200A.

The specific configuration of the above embodiment is merely an example, and the present invention is not limited to this, and can be appropriately changed.

For example, in the second embodiment, two optical fibers are arranged inside one silo. However, two optical fibers may be arranged inside one silo. Further, in the embodiment, the case where the storage item in the silo is coal has been described, but the storage item may be grain. As an example of the grain, for example, corn root, wheat, barley, soybean, corn, rapeseed and the like are applicable. According to the present invention, these grains can also be controlled within their respective proper temperature reference ranges.

1 Temperature Detector 10 Optical Fiber 31 First Silo (Silo)
32 Second silo
50, 60 Bending member 100 Forward optical fiber section 200, 200A Folding section 300 Return optical fiber section 412, 422 Folding section

Claims (8)

An optical fiber that is disposed inside the silo and that includes an outward optical fiber portion, a folded portion, and a return optical fiber portion,
The outward optical fiber portion extends from one end side in the axial direction of the silo to the other end side,
The folded-back portion has a curved shape and is integrally connected to an end portion of the outward path side optical fiber portion,
The return path side optical fiber portion extends from the other end side in the axial direction of the silo toward the one end side, and is integrally connected to the end portion of the folded portion,
On the inner peripheral side and the outer peripheral side of the folded-back portion, a bending member is arranged along the shape of the folded-back portion,
The bending member has a cylindrical first jig extending along the axial direction, and a second jig arranged on an inner peripheral side of the first jig,
The second jig has an intermediate portion around which the folded-back portion of the optical fiber is wound, and a pair of flanges provided on both sides of the intermediate portion,
An edge of the intermediate portion on the other end side in the axial direction is located on the other end side than an edge of the first jig on the other end side in the axial direction ,
Temperature detector. The temperature detecting device according to claim 1, wherein the folded-back portion is arranged at a bottom portion of the silo. The temperature detecting device according to claim 1, wherein the folded-back portion is curved in a U shape in a side view. Outer peripheral sides of the first jig and the second jig are covered with a main body cover,
The temperature detecting device according to claim 1, wherein the other ends of the first jig and the second jig in the axial direction are covered with a tip cover. The temperature detecting device according to claim 4, wherein the folded portion is wound around a bending member. The temperature detection device according to claim 1, wherein a plurality of optical fibers are provided for one silo. The temperature detection device according to claim 1, wherein a plurality of silos are provided, an optical fiber is provided for each silo, and the optical fibers are connected to each other. The temperature detection device according to any one of claims 1 to 7, wherein the content in the silo is coal.

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