JP3006740B2 - Overheat detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overheat detecting device for detecting abnormal heat generation of an electric wire, an electric wire connecting member, and an electromechanical device.

[0002]

2. Description of the Related Art At a wire connection portion (an end clamp or a straight sleeve) of a power transmission line, if there is a connection deterioration due to corrosion or poor construction, abnormal heat generation occurs, resulting in deterioration of performance and ultimately. There is a concern that the wire connection may melt. Therefore,
Work to check for abnormal heat generation is required.

Conventional methods for checking abnormal heat generation include a method using an infrared thermal imager for detecting the intensity of infrared rays radiated from a heat generating portion, a method for measuring a minute resistance of a wire connection portion, and detecting a heat generation condition from a measured resistance value. For example.

[0004]

The above-mentioned method using the infrared thermal imaging apparatus is excellent in that the heating portion of the electric wire stretched over the steel tower can be observed from the ground, but the infrared thermal imaging apparatus is expensive. At the same time, the measurement result is greatly affected by the load current flowing through the transmission line and weather conditions such as rain and wind, and the reliability of the measurement value is poor.

[0005] In the method of measuring a minute resistance, it is necessary to stop the operation of a transmission line or the like and then climb to a steel tower in order to arrange a measuring terminal at a wire connection portion.
Power outage work and work on the tower are extremely complicated and lack economical efficiency.

Further, in the above two methods, a power supply for operating the apparatus is required, and it is difficult to secure the power supply when the transmission line is stretched in a mountainous area or the like. However, there is a problem that heavy equipment for securing a power supply is required.

[0007] Therefore, it is desired to provide a detection device that can determine whether or not an abnormality has occurred in a wire connection portion from the ground and that can be manufactured at low cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and provides an overheat detecting device which displays when a wire connecting portion generates heat above a predetermined high temperature and which can be manufactured at low cost. Aim.

[0009]

In order to achieve the above object, an overheat detecting apparatus according to the present invention has an end protruding from a tube made of a good heat conductive metal attached to the surface of an inspection object. A rod-shaped member is inserted in a state, and a substance that is solid at room temperature, restricts the insertion of the rod-shaped member at a normal temperature, is melted at a predetermined high temperature, and allows the rod-shaped member to be inserted, and is protruded. A movable member whose movement according to elasticity is restricted by the end of the rod-shaped member, and display means for displaying that the predetermined high temperature is detected by movement according to elasticity of the movable member. Have been.

[0010] The substance may be wax, and the display means may be configured to cause the red cloth to hang or protrude according to the movement of the movable member.

[0011]

[Operation] If the test object does not generate abnormal heat, the substance in the tube maintains a solid state, insertion of the rod-shaped member is restricted, and the movable member does not move. As a result, the display means does not perform the display operation. However, when the test object generates abnormal heat and the substance in the tube is exposed to a predetermined high temperature, the substance is melted and insertion of the rod-shaped member is allowed. Then, the movable member is moved according to the elasticity, and the display means performs a display operation to detect that a predetermined high temperature has been detected.

[0012] If a substance that melts due to abnormal heat generation is to be obtained, the production of the apparatus can be inexpensive, and the detection temperature can be set to a temperature of about 100 ° C. Furthermore, if the display means makes the red cloth hang or protrude,
Whether or not the overheat detection device of the present invention attached to a transmission line or the like stretched over a steel tower has detected a predetermined high temperature can be easily determined from the ground based on a comparison with the sky color.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of one embodiment of an overheat detecting device according to the present invention, wherein FIG. 1A is a diagram in which a predetermined high temperature is not detected, and FIG. FIG. 2 is an exploded perspective view of the overheat detection device shown in FIG. 1, and FIG. 3 is an external perspective view of the state where the overheat detection device shown in FIG. 1 is attached to an electric wire.

1 to 3, a cylindrical rod-shaped member 12 is inserted into a cylindrical tube 10 made of a good heat conductive metal such as aluminum with one end thereof protruding. Then, a wax 14 is disposed near the insertion end of the rod-shaped member 12 in the tube 10. The wax 14 is solid at normal temperature, the insertion of the rod-shaped member 12 into the tube 10 is limited, and when the wax 14 is exposed to a predetermined high temperature (for example, around 100 ° C.), the wax 14 is melted. Insertion is allowed. It should be noted that the use of the wax 14 can reduce the abnormal heat detection
Although the temperature can be set to about 0 ° C., a substance such as resin, rubber, or solder may be used to obtain a higher detection temperature. Further, the detection temperature can be arbitrarily set at 50 to 60 ° C. or more by selecting the type of the brazing 14.

Holes 16a and 16a are formed on opposite sides of the U-shaped metal fitting 16 having the length of the tube 10 as an inner dimension.
a is drilled, and the rod-shaped member 1 is inserted into one hole 16a from the inner side.
2, the tube 10 is disposed in the U-shaped bracket 16, a screw 18 is penetrated from the outside into the other hole 16a, and further inserted into the free end of the tube 10, and this free end is The screw 18 is fixed to the tube 10 by caulking. So,
The tubular body 10 and the rod-shaped member 12 are assembled to the U-shaped bracket 16.

A holding portion 22 for holding an electric wire 20 as an object to be inspected from both sides is provided at a central side of the U-shaped bracket 16.
The mounting member 22 having a and 22a is fixed, and the bottomed cylindrical storage member 24 is fixed with the opening facing the opposite side to the tube 10.

The mounting member 22 is dimensioned so that the tube 10 is attached to the electric wire 20 while holding the electric wire 20, and windows 22b, 22b.
The electric wires 20 and the tube 10 are formed so as to be bundled together by the bands 26, 26. In addition, when the attachment member 22 is formed of, for example, stainless steel and the electric wire 20 is an aluminum wire, the contact surfaces of the grip portions 22a, 22a are
Glass cloth tapes 22c, 22c for preventing electrolytic corrosion are attached. The glass cloth tapes 22c, 22c
Also functions as a heat insulating material that prevents the heat of the electric wire 20 from being transmitted to the mounting member 22 and dissipated.

Further, a movable member 28 having an L-shaped cross section is pinched on the outer peripheral surface of the storage member 24 on the side where the rod-shaped member 12 protrudes so that the direction of movement and insertion of the rod-shaped member 12 is the rotation direction.
0 and a bearing 32 so as to be rotatable. In addition, one end of the movable member 28 abuts on the rod-shaped member 12 by the spring 34 and is elastically urged to press the rod-shaped member 12 in the insertion direction. The storage member 24 is provided with a notch 24a facing the L-shaped portion at the other end of the movable member 28, and a long hole 24b is formed in a peripheral surface facing the notch 24a.

Further, a red cloth 38 formed in a cylindrical shape is put on the outer periphery of the coil spring 36 and is appropriately fixed with a thread. One end of the coil spring 36 is fixed to the housing member 24 by using a fixing plate 40. Screws 42, 42 at the bottom inside
Is fixed by The screws 42, 42 penetrate the U-shaped bracket 16 and the mounting member 22, and are fixed together using a nut (not shown). At the other end of the coil spring 36, claws 44a, 44a on which a lid body 44 is provided are bent and fixed. The lid 44 is provided with a first projection 44b which is inserted into the notch 24a of the storage member 24 and is inserted into the other end of the movable member 28 to engage with the L-shaped portion. A second projection 4 which is removably inserted into the long hole 24b of the storage member 24 at a position opposite to the projection 44b.
4c is provided. The display means is formed by the coil spring 36 and the red cloth 38.

In such a structure, the coil spring 36 covered with the red cloth 38 has the storage member 2 against the elasticity.
8 and the second protrusion 44 c of the lid 44 is
8, the first protrusion 44b is engaged with the L-shaped portion of the movable member 28, and the storage member 24 is closed. Here, rotation of the movable member 28 due to the elastic force of the spring 34 is restricted by the rod-shaped member 12 whose insertion is restricted by the wax 14. Then, in this state, the electric wire 20 is gripped by the gripping portions 22a, 22a of the mounting member 22, and the electric wire 20 and the tube 10 are further bundled together by the bands 26, 26, as shown in FIGS. As described above, the overheat detection device of the present invention is attached to the electric wire 20 so as to hang down.

In this state, the red cloth 38 is stored in the storage member 24 and cannot be seen from outside such as the ground.

Then, when abnormal heat is generated in the electric wire 20 and the heat is transmitted to the tube 10 and the brazing 14 is exposed to a predetermined high temperature, the brazing 14 is melted, and the elasticity of the spring 34 causes the brazing 14 to move to the movable member 28. The rod-shaped member 12 is further pressed and inserted into the tube 10 to allow the movable member 28 to rotate. By the rotation of the movable member 28, the engagement of the first protrusion 44b of the lid 44 from the L-shaped portion is released. As a result, due to the elasticity of the coil spring 36 and the weight of the lid 44, the lid 44 swings around the second projection 44c, and further the second projection 44c.
1C comes out of the elongated hole 24b, and the red cloth 38 projects from the storage member 24 and hangs down as shown in FIG.

In this state, the red cloth 38 can be easily visually recognized from the ground or from a patrol helicopter or the like.

Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a longitudinal sectional view of another embodiment of the overheat detection device of the present invention in a state where a predetermined high temperature is not detected, and FIG. 5 is an exploded perspective view of the overheat detection device shown in FIG. . 4 and 5, members that are the same as or equivalent to those in FIGS. 1 to 3 are given the same reference numerals, and redundant description is omitted.

Another embodiment shown in FIG. 4 and FIG.
3 is different from the embodiment shown in FIG. 3 in the structure of the display means and the storage member for storing the display means. The differences are as follows.

First, the storage member 50 fixed to the U-shaped bracket 16 and the mounting member 22 has a box shape or a U-shaped cross section with one surface opened, and the opening is directed to the side opposite to the tube 10. Fixed. And, the bearing 52 protruding from the storage member 50 is disposed so that the rotation in accordance with the elasticity of the spring 34 is restricted by the rod-shaped member 12 in a state where the movable member 28 protrudes. Further, the second bearing 5 is provided near the opening end of the storage member 50 on the side opposite to the side on which the movable member 28 is provided.
4, and a lid 58 is rotatably disposed by a pin 56. The free end of the lid 58 is formed to be engaged with the L-shaped portion of the movable member 28 to close the opening of the storage member 50. In addition, the second spring 60 elastically urges the storage member 50 in a direction to open the opening. And the storage member 50
One end of a band-shaped red cloth 62 is fixed to the bottom of the base with screws 64. The other end of the band-shaped red cloth 62 is formed in a bag shape and the weight 66 is stored therein. The display means is formed by the band-shaped red cloth 62 and the weight 66.

In this configuration, the belt-shaped red cloth 62
Is stored in the storage member 50, and the lid 58 is
The opening is closed by rotating against the elasticity of the movable member 28, and its free end is engaged with the L-shaped portion of the movable member 28, and the state shown in FIG. 4 is obtained. Here, at normal temperature, the insertion of the rod-shaped member 12 is restricted by the wax 14 and the movable member 28 is
4 cannot be rotated in accordance with the elasticity of, and the state of FIG. 4 is maintained as it is.

When the solder 14 is exposed to a predetermined high temperature and melts due to abnormal heat generation of the electric wire 20, the rod-shaped member 1
The movable member 28 is rotated by the elastic force of the spring 34 and the engagement of the free end of the lid 58 is released. Then, the lid 58 is rotated by the elastic force of the second spring 60, and the opening of the storage member 50 is opened. As a result, the weight 66 causes the red cloth 62 to drop from the storage member 50 and hang down.

In the overheat detecting device according to the present invention, the display means for displaying that the wax 14 has been exposed to the predetermined high temperature at which the wax 14 is melted is not limited to the above embodiment. Any structure may be used as long as it can be easily recognized from the ground or the like. This movable member 2
The movement of 8 is not limited to the rotation as in the embodiment, but may be any structure as long as it can be appropriately moved by elasticity and the display means can perform a display operation. The color of the display means may be other than red. Then, instead of the wax 14, an appropriate substance that melts from a solid to a liquid at a predetermined temperature can be used, but a memory alloy or the like that deforms at a predetermined temperature can also be used. Further, the overheat detection device of the present invention is not limited to a device that detects abnormal heat generation at a wire connection portion of a transmission line. It may be used to detect the temperature of equipment or the like that may be affected. In this case, the structure of the mounting member 22 may be appropriately changed in order to appropriately attach the tube 10. In addition, it goes without saying that the structure of the display means may be appropriately changed.

[0030]

As described above, since the overheat detecting device of the present invention is constituted, the following special effects can be obtained.

In the overheat detecting device according to the first aspect,
If the attached inspection object has abnormal heat generation, the substance will melt and the movable member will move, and the display means will be displayed. Can be determined. Except for the work of attaching the overheat detection device of the present invention to an object to be inspected, for example, there is no need to go up to a steel tower, no power supply for measurement is required, and it is possible to easily determine from a distant place such as the ground. Maintenance management of inspection objects such as electric wires is easy. In addition, the present apparatus uses a state change due to a change in temperature of a substance, is excellent in durability and weather resistance, does not require replacement due to aging, and maintenance is easy from this point as well. Furthermore, it does not require expensive equipment for measurement and is economical.

In the overheat detecting device according to the second aspect, since a wax is used as a substance that is melted by abnormal heat generation,
This apparatus can be manufactured at low cost, and the detection temperature can be appropriately set to a temperature of about 100 ° C. Then, since the red cloth is hung or projected as the display means, if the object to be inspected is the wire connection part of the power transmission line, when observing the overheat detection device of the present invention at a high place from the ground, the background sky Is contrasted with the red color of the cloth, and the identification operation can be performed easily and reliably.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of an overheat detecting device according to the present invention, in which (a) is a diagram in which a predetermined high temperature is not detected, and (b) is a diagram in which a predetermined high temperature is detected. FIG.

FIG. 2 is an exploded perspective view of the overheat detection device shown in FIG.

FIG. 3 is an external perspective view showing a state where the overheat detection device shown in FIG. 1 is attached to an electric wire.

FIG. 4 is a longitudinal sectional view of another embodiment of the overheat detecting device of the present invention in a state where a predetermined high temperature is not detected.

FIG. 5 is an exploded perspective view of the overheat detection device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tube 12 Bar-shaped member 14 Wax 20 Electric wire 28 Movable member 34 Spring 36 Coil spring 38 Cylindrical red cloth 62 Strip-shaped red cloth 66 Weight

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kikuo Kimura 1-25 Konyacho, Morioka-shi, Iwate Tohoku Electric Power Company Iwate Branch (72) Inventor Yuichi Sasaki 3-chome Ichibancho, Aoba-ku, Sendai-shi, Miyagi No. 7-1 Tohoku Electric Power Co., Inc. Construction Department (72) Inventor Toshio Nakamura 1-25 Konyacho, Morioka City, Iwate Prefecture Inside Iwate Branch of Tohoku Electric Power Company (72) Inventor Jiro Ito 1-25 Konyacho, Morioka City, Iwate Prefecture Tohoku Electric Power Company Iwate Branch (72) Inventor Kikuzo Numabukuro 1-25 Konoyacho, Morioka City, Iwate Prefecture Tohoku Electric Power Company Iwate Branch (72) Inventor Akihiko Urata 1-25 Konyacho, Morioka City, Iwate Tohoku (72) Inventor Hideaki Kikuchi 1-8-1, Hisamoto, Takatsu-ku, Kawasaki City, Kanagawa Prefecture Inside Asahi Electric Co., Ltd. (72) Inventor Yasuo Hiruma River, Kanagawa Prefecture 1-8-1, Hisamoto, Takatsu-ku, Asahi Denki Co., Ltd. (56) References Japanese Utility Model Showa 48-2790 (JP, U) Japanese Utility Model Showa 58-112349 (JP, U) Japanese Utility Model Showa 54-124896 (JP) , U) Japanese Utility Model Application Hei 2-122399 (JP, U) Japanese Utility Model Application Utility Model No. 6-60249 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01K 11/06

Claims (2)

(57) [Claims] 1. A rod-shaped member having one end protruding is inserted into a tube made of a good heat conducting metal attached to the surface of an object to be inspected. A movable member whose insertion is restricted and which is melted at a predetermined high temperature to permit insertion of the rod-shaped member is provided, and a movable member whose movement in accordance with elasticity is restricted by an end of the rod-shaped member in a protruding state. An overheat detecting device provided with a display means for displaying that the predetermined high temperature has been detected by a movement according to the elasticity of the movable member. 2. The overheat detecting device according to claim 1,
The overheat detecting device, wherein the substance is wax, and the display means is configured to cause the red cloth to hang or protrude according to the movement of the movable member.