JP5783628B2 - Abnormal heat detection device for wire connection - Google Patents

Description

  The present invention relates to an abnormal heat detection device that uses a shape memory alloy to monitor temperature at a connecting portion of an electric wire such as an overhead power transmission line.

  For example, a compression connection using a sleeve is performed for securing an electric wire to a steel tower or connecting electric wires to each other. Since this wire connection part generates heat due to an impediment to conductivity, a shape memory alloy is attached to the wire sleeve to prevent overheating of the wire connection part, and abnormal heat generation occurs due to deformation of the shape memory alloy when a certain temperature is reached. A heat generation detection device for informing a monitoring person is known (Patent Document 1). This device has a heat sensor made of a shape memory alloy wrapped around a sleeve with a band member and brought into close contact with it. When the temperature of the sleeve reaches a predetermined temperature due to abnormal heat generation, it deforms into a U shape and rises from the surface of the compression sleeve. Abnormal heat generation at the connection can be visually confirmed on the ground.

JP-A-2-183973

In the above-described conventional heat detection device, the entire heat sensor body that starts up in the event of abnormal heat generation is composed of a nickel-titanium alloy that is a shape memory alloy, so deformation of the shape memory alloy is started by Joule heat and radiant heat of sunlight. However, there is a case where the robot stands up to a midway position that does not reach an upright position and cannot determine whether or not it is abnormally overheated. In addition, since the thermal sensor body is configured to be visible, the amount of the shape memory alloy used is large, which hinders the reduction of the manufacturing cost. Furthermore, since the device is mounted with the band wound around, the mounting site is limited to the sleeve, and it is difficult to apply to other sites such as connection terminals.
Therefore, the present invention reliably detects the heat generation state and clearly confirms this, and reduces the cost by reducing the use of the shape memory alloy as much as possible, and the attachment part to be attached in a close contact state. It is an object of the present invention to provide a heat detection device for a wire connection part that expands the degree of freedom.

In order to solve the above-mentioned problems, the present invention is in close contact with the wire connection portion in the abnormal heat detection device 1 for the wire connection portion that deforms the shape memory alloy due to abnormal heat generation in the wire connection portion and visually confirms the heat generation state. A frame 2 having good heat conductivity that can be attached is provided, and the base end portion of the trigger piece 3 including a shape memory alloy whose free end portion is deformed by heat generation of the wire connection portion is fixed to the frame body 2; Further, the display piece 5 is supported on the frame 2 so as to be displaceable between a standby position where the display piece 5 is hung on the electric wire connection portion and a detection position rising from the electric wire connection portion, and the trigger piece 3 is engaged with the display piece 5 for display. The displacement of the piece 5 from the standby position to the detection position is prevented, the displacement of the trigger piece 3 is allowed to move to the detection position, and the display piece 5 is attached from the standby position to the detection position by the spring member 4. It was configured to support.
The trigger piece 3 is fixed on the frame 2 so as to be deformed in the horizontal direction, the spring member is constituted by a torsion spring 4 supported on the frame 2 in the horizontal direction, and one end thereof is locked to the frame 2. The display piece 5 is supported at the other end, and the display piece 5 is biased upward.
The display piece 5 is arranged below the trigger piece 3 at the standby position, and jumps to the detection position by deformation of the trigger piece 3.
In order to fix the frame body 2 to the electric wire connecting portion, an attachment band 6 that is wound around the compression connecting sleeve C1 of the electric wire connecting portion is provided.
In order to fix the frame body 2 to the electric wire connecting portion, a ring plate that penetrates the screw shaft of the connecting bolt B of the electric wire connecting portion and fastens it with the bolt head is provided.

According to the present invention, since the display piece is engaged with the trigger piece in a state of being biased by the spring member, the display piece is instantly appeared at the detection position by the deformation of the trigger piece to the position where the display piece is released. The distinction of abnormal overheating becomes clear. In addition, the trigger piece may be a small piece that prevents the displacement of the display piece, and the amount of expensive shape memory alloy used can be reduced as much as possible, and can be provided at low cost.
In addition to being attached to the sleeve by the mounting band, the ring plate can be attached in close contact with the connecting terminal board having the unevenness due to the connecting bolt.

It is a perspective view of the abnormal heat detection device of the present invention. It is a top view of an abnormal heat generation detection apparatus. It is a front view of an abnormal heat generation detection apparatus. It is a perspective view of the abnormal heat detection device of other embodiments. It is a top view of the abnormal heat detection device of other embodiments. It is a front view of the abnormal heat detection device of other embodiments. It is a front view of a securing clamp.

An embodiment of the present invention will be described with reference to the drawings.
In FIG. 7, the retaining clamp C to the steel tower of the overhead power transmission line is substantially L-shaped, and is provided with a sleeve C <b> 1 compression-connected to the end of the wire in order to hold the wire at one end, and a jumper wire at the other end A jumper socket S for connecting J is provided with a connecting terminal plate C2 for fixing with a bolt B.

  As shown in FIGS. 1 to 3, the heat generation detection device 1 is attached to the mouth of the sleeve C1 on the wire insertion side. This heat generation detection device 1 makes it possible to visually check the abnormal heat generation state of the sleeve C1 of the tension clamp C that is a wire connection portion. The heat generation detection device 1 includes a frame 2, a trigger piece 3 made of a shape memory alloy, a torsion spring 4 engaged with the trigger piece 3, and a display piece 5 fixed to a rising end of the torsion spring 4. And an attachment band 6 which is an attachment member for fixing to the electric wire connection portion.

  The frame body 2 is made of a metal plate material having good thermal conductivity, and includes a rectangular flat seat plate portion 7 and a pair of opposing brackets 8 rising vertically from both edges on one end side of the seat plate portion 7. 8, a support pin 9 passed between the brackets 8 and 8, and a cover plate 10 that rises vertically from one end edge of the seat plate portion 7 and then bends in the horizontal direction to connect the brackets 8 and 8. To do. A horizontally long band pass 8a for inserting the attachment band 6 is opened at the lower ends of the brackets 8 and 8.

  The trigger piece 3 is made of a rod-shaped shape memory alloy that can be deformed to return when the set temperature is reached by heat generation of the sleeve C1. The trigger piece 3 is fixed by a fixed cylinder 11 in which one side edge of the other end portion of the seat plate portion 7 is wound around the trigger piece 3. The free end 3 a of the trigger piece 3 always protrudes to the side of the frame body 2, and returns and deforms in the horizontal direction on the seat plate 7.

  The torsion spring 4 that is a spring member is made of a metal wire, and has a string winding portion 4a wound around the support pin 9 of the frame body 2 at an intermediate portion thereof, a locking portion 4b that presses against the seat plate portion 7 at one end portion, The other end portion has a standing portion 4c that is bent and extends on the crank so as to be elastically engaged with the trigger piece 3. The upright portion 4c can be displaced between a standby position where the upright portion 4c is tilted in the horizontal direction and a detection position where the upright portion 4c rises substantially vertically from the seat plate portion 7. When the upright portion 4c is tilted while being stored in the torsion spring 4 and disposed below the trigger piece 3, it fits into the notch 7a provided in the longitudinal direction of one side edge of the seat plate portion 7 and engages with the trigger piece 3. Then, it is held at the standby position.

  The display piece 5 is made of a metal plate material, and is fixed to the tip end portion of the upright portion 4c so that the plate surface is substantially horizontal when engaged with the trigger piece 3 of the upright portion 4c.

  The attachment band 6 is passed through the band through 8a of the brackets 8 and 8 and wound around the mouth position of the sleeve C1, and both ends thereof are bound, and the frame body 2 is brought into close contact with the sleeve C1.

  The heat generation detection device 1 is attached to the sleeve C1 by the attachment band 6 and is mounted in a state where the upright portion 4c of the torsion spring 4 is engaged with the trigger piece 3. When the sleeve C1 reaches a predetermined temperature due to heat generation, the free end 3a of the trigger piece 3 is deformed in the horizontal direction onto the frame 2, so that the standing portion 4c instantaneously jumps to the detection position by the spring force of the torsion spring 4. The display piece 5 is raised. With this display piece 5, the abnormal heat generation of the sleeve C1 can be visually confirmed. The trigger piece 3 only needs to prevent the rising portion 4c of the torsion spring 4 from rising, and a small piece is sufficient, so that the amount of expensive shape memory alloy used can be reduced.

Another embodiment is shown in FIGS. In the figure, the same components as those in the previous embodiment are denoted by the same reference numerals, and description thereof is omitted.
The heat generation detection device 12 mounted on the connection terminal plate C2 of the connection clamp C is fixed with a bolt B for fixing the connection clamp C to the jumper socket connection terminal S. A ring plate 13 extends laterally on the seat plate portion 7 of the frame 2 of the heat generation detection device 12. The ring plate 13 is continuously formed of a metal plate material having a good thermal conductivity that constitutes the seat plate portion, and includes a bolt hole 13a that penetrates the screw shaft of the bolt B. Fixed.

  The heat detection device 12 is attached to the connection terminal plate C2 by the ring plate 13 and is mounted in a state where the rising portion 4c of the torsion spring 4 is engaged with the trigger piece 3 in the same manner as described above. When the connection terminal plate C2 reaches a predetermined temperature due to heat generation and the trigger piece 3 is deformed, the upright portion 4c jumps up instantaneously by the spring force of the torsion spring 4, and the display piece 5 is raised.

  The present invention is an abnormal heat detection device that is effective for visually confirming temperature monitoring at a connecting portion of an electric wire such as an overhead power transmission line using a shape memory alloy.

DESCRIPTION OF SYMBOLS 1 Heat generation detection apparatus 2 Frame 3 Trigger piece 4 Torsion spring 4c Standing part 5 Display piece 6 Mounting band 7 Seat plate part 8 Bracket 8a Band through 9 Support pin 11 Fixed cylinder 12 Heat generation detection apparatus 13 Ring plate 13a Bolt hole C Retention clamp C1 Sleeve C2 Connection terminal board B Bolt

Claims (3)

In the abnormal heat detection device of the electric wire connection part that the shape memory alloy is deformed by the abnormal heat generation of the electric wire connection part and the heat generation state is confirmed visually,
A frame that has good thermal conductivity and can be attached in close contact with the wire connection portion;
And table示片that will be displaceably supported in the frame on the body between the detecting position rising from the wire connecting portion to lie down standby position and the wire connection portion,
A shape that is fixed in parallel to the frame body at an interference position that prevents the display piece from rising, and is deformed while being parallel to the frame body due to the heat generated by the wire connection portion, and is separated from the interference position to allow the display piece to rise. A trigger piece including a memory alloy;
A torsion spring having one end locked to the frame body, supporting the display piece at the other end, urging the display piece in a rising direction , and flipping the display piece to a detection position by deformation of the trigger piece; An apparatus for detecting abnormal heat generation in a wire connecting portion. The abnormal heat generation of the wire connection part according to claim 1, further comprising a mounting band wound around a compression connection sleeve of the wire connection part in order to fix the frame body to the wire connection part. Detection device. 2. The ring plate according to claim 1, further comprising a ring plate that passes through a screw shaft of a connecting bolt of the electric wire connecting portion and is fastened by a bolt head to fix the frame to the electric wire connecting portion. An abnormal heat detection device for the wire connection part.

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