JPH028351Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) This invention relates to a ground-mounted airborne multi-circuit switch and a high-voltage lead-in switch, and in detail relates to the structure of the pressure relief hole of the switch. It is.

(Prior art) Conventionally, in order to prevent internal pressure from rising due to internal short circuits and the risk of equipment damage, a pressure relief hole was provided in a part of the outer box of the switch. Usually, a pressure relief cover is attached to prevent the pressure relief hole from forming. However, when the switch equipped with the above-mentioned pressure relief lid is installed on the ground, such as on the street, it is placed with its back against the road side on the sidewalk or against a wall such as a wall. When the pressure relief lid operates and releases pressure, the direction of the pressure release is not determined and there is a risk of causing a public disaster.

(Problems to be Solved by the Invention) This invention solves the problem that exists in the conventional technology, that is, when the pressure relief lid operates, the direction of pressure relief is not determined and there is a risk of causing a public disaster. This is what we are trying to solve.

Structure of the invention (Means for solving the problem) This invention was made to solve the above-mentioned problem, and consists of an opening that communicates with the inside and outside of the outer box wall of a switch that has an opening/closing door on the front. A pressure hole is provided, and a groove portion consisting of a front groove portion, a rear groove portion, and a connecting groove portion that connects both front and rear groove portions is provided on the periphery of the pressure relief hole, and a pressure relief lid that covers the pressure relief hole and the groove portion is provided in the front groove portion. It is rotatably supported with respect to the outer box by a hinge stored in the groove, and a guide part for guiding the pressure relief gas to the rear of the switch is housed in the rear groove, and the pressure relief lid and the pressure relief The gist is that a flexible shielding plate is provided on one of the front edges of the hole to shield the gap between the two.

(Function) With the above configuration, when the internal pressure of the outer box increases, the pressure relief cover of the pressure relief hole opens outward, and the released gas is released toward the rear of the switch along the guide portion. Also, during this pressure release, the gap between the pressure relief cover and the front edge of the pressure relief hole is shielded by the shielding plate, so the pressure relief gas flows from the gap between the pressure relief cover and the front edge of the pressure relief hole. There is no way to move forward. Furthermore, since the hinge portion and the guide portion are not exposed to the outside due to the pressure release lid, they will not be damaged by external mischief or the like, and a smooth ejection operation can always be expected.

(Example) Hereinafter, an example in which this invention is embodied in a multi-circuit switch will be described with reference to FIGS. 1 to 8.

The outer box 1 of the switch is provided with a pair of left and right opening/closing doors 2 on the front surface that can be opened double-sided, and on the left and right side walls 3 and 4 there are square annular plates 3a and 4a facing inward, and a stepped plate 3b. A pressure release hole 5 having a vertically elongated rectangular shape is opened through the hole 4b. The periphery of the pressure relief hole 5 has square annular protrusions 3c, 4.
c is formed to protrude outward in an L-shape, and its tip is bent obliquely outward to provide a circumferential contact portion 6. Therefore, on the periphery of the pressure relief hole 5, there are plates 3a, 4a and step plates 3b, 4b.
The protrusions 3c and 4c form a front groove 30a and a rear groove 30b that extend in the vertical direction, and a connecting groove 30c that extends in the horizontal direction and connects the front and rear grooves 30a and 30b.
A groove portion 30 is constituted by 30b and 30c.

A plurality of mounting pieces 7 having a rectangular cross section are fixed by welding in series to the plates 3a and 4a extending in the vertical direction of the rear groove portion 30b on both side walls 3 and 4 (see FIGS. 3 and 5). ). The mounting piece 7
includes a plurality of guide plates 8A, 8 as guide parts.
B and 8C are tightened and fixed with bolts 9.
The guide plates 8A, 8B, and 8C are arranged so that their base ends are close to or in contact with the step plates 3b and 4b, and their tips are close to or in contact with the plates 3a and 4a (that is, so as to face toward the rear of the switch). arranged diagonally.

In addition, in FIGS. 5 and 6, the guide plate 8A disposed above the side walls 3 and 4 has a connecting plate 10 protruding from one side along the step plates 3b and 4b extending in the transverse direction. An auxiliary guide plate 11 is integrally formed at the tip of the plate 10 and extends parallel to the guide plate 8A. In FIGS. 5 and 7, a connecting plate 12 is protruded from one side of the guide plate 8B disposed below the side walls 3 and 4 along the horizontally extending step plates 3b and 4b. An auxiliary guide plate 13 extending parallel to the guide plate 8B is integrally formed at the tip of the guide plate 8B.

Step plates 3b, 4b and protrusions 3 extending in the vertical direction of the front groove 30a on the side walls 3, 4
A hinge 14 is fixed to the hinges 14 and 4c, and a pressure relief cover 15 covering the pressure relief hole 5 is pivotally supported on the hinge 14 so as to be rotatable in the opening direction. The pressure relief lid 15 is formed in the shape of a square box with a lid, and its side plate 15a formed in the shape of a square ring is surrounded by the plates 3a, 4a, step plates 3b, 4b, and protrusions 3c, 4c. The guide plates 8A, 8B, 8C and the hinge 1 can be inserted into the groove 30.
It is designed to cover 4.

Further, a reinforcing frame 16 having a channel-shaped cross section facing into the pressure relief hole 5 is fixed to the inner surface of the pressure relief lid 15 in a square frame shape by welding, and the pressure relief lid 15 is attached so as to surround the outer periphery of the reinforcement frame 16. There is a patchkin 1 on the inner surface of the
7 is adhered and fixed with adhesive, and the same packing 17
is adapted to come into contact with the contact portion 6 when the pressure relief cover 15 closes the pressure relief hole 5. A plurality of regulating pieces 18 that abut the sides of the gasket 17 are fixed by welding to the outside of the gasket 17 provided on the upper and both sides of the inner surface of the pressure relief lid 15.

In addition, a pair of shielding plates 19 are fixed to the reinforcing frame 16 between the upper and lower reinforcing frames 16 and the packing 17, and when the pressure relief lid 15 closes the pressure relief hole 5, the tip of the shielding plate 19 is fixed to the reinforcing frame 16. is inserted into the pressure relief hole 5.
That is, the shielding plate 19 is disposed close to both the upper and lower ends of the pressure release hole 5. In the pressure relief lid 15, an insulating flexible shielding plate 16a made of rubber or the like is fixed to the front reinforcing frame 16 by adhesive or the like so as to extend in the vertical direction, and its tip end is attached to the front side of the side walls 3, 4. It is in contact with the inner surface of the side protrusions 3c, 4c.

Three upper and lower bearing fittings 20 are fixed to the open side (rear side) of the pressure relief lid 15, and a bearing fitting 2 is fixed to the side piece 15a extending vertically on the open side.
A pressure relief groove 15b is formed except for the portion corresponding to 0. The outer end of an angle regulating rod 22 is rotatably connected to the bearing fitting 20 via a connecting pin 21, and the inner end of the angle regulating rod 22 slidably passes through the step plates 3b, 4b. and inserted into the outer box 1. A coil spring 24 is wound between a reinforcing plate 23 disposed on the inner surface of the step plates 3b and 4b at the inner end of the angle regulating rod 22 and a double nut 23 screwed onto the inner end of the angle regulating rod 22. The pressure relief cover 15 is always connected to the pressure relief hole 5 through the angle regulating rod 22.
is biased and held in the closed position.

The operation of the switch configured as described above will be explained.

When an internal short circuit occurs in the switch and the internal pressure of the outer box 1 rises in the state shown in FIG. It is rotated in the direction of the arrow P in FIG. 3 against the urging force of , and the abnormal pressure is released to the outside through the pressure release hole 5. At this time, the pressure relief lid 15 is installed so that the pressure relief gas is discharged diagonally to the rear of the outer box 1, and furthermore, the shielding plate 19 of the pressure relief lid 15 restricts the release upward and downward. Therefore, abnormal pressure is released to the rear. Furthermore, the abnormal pressure released rearward from the pressure release hole 5 is further guided diagonally rearward by the guide plates 8A, 8B, and 8C, so that gas is efficiently released from the switch.

If the guide plates 8a, 8b, and 8c are not provided, when the internal pressure of the outer box 1 increases, the pressure release lid 15 will be pressed outward. However, at the initial opening position of the pressure relief lid 15, some of the gas once hits the inner surface of the pressure relief lid 15 and enters the rear groove portion 30b, as shown by the arrow indicated by the two-dot chain line in FIG. 4b. enter,
After that, the gas that entered the groove part 30b is
It flows from the open end of the pressure relief lid 15 to the side (to the right in FIG. 4b) along the inner plate 4a.
When this gas flow passes through the open end of the pressure relief lid 15, a portion of the gas becomes turbulent and flows forward, potentially causing a public disaster.

On the other hand, in this embodiment, the guide plates 8A, 8B,
8C, even when the pressure release lid 15 is at the initial opening position, the gas can be smoothly transferred through the guide plates 8A, 8B, and 8C as shown by the dashed-dotted arrow in FIG. 4b. Guide it and release it backwards.

Therefore, the released gas does not reach passersby in front of the outer box 1, thereby preventing public disasters.

In addition, when the rise in the internal pressure of the outer box 1 is small, the pressure relief lid 15 is rotated slightly by the same pressure in the direction of the arrow P in FIG. 3 about the hinge 14 against the biasing force of the coil spring 24. At this time, a pressure relief groove 15b is formed in the side piece 15a of the open side of the pressure relief lid 15.
, the abnormal pressure is released to the outside via the pressure release hole 5 and the pressure release groove 15b. Then, in the same way as above, at this time, the pressure relief groove 15a
The abnormal pressure released rearward from the guide plate 8A,
Since the gas is guided diagonally backward by 8B and 8C, the gas is efficiently released from the switch.

After the internal pressure is released, the pressure relief lid 15 returns to the closed position due to the biasing force of the coil spring 24.

In addition, in this embodiment, the outer surface of the outer box 1 is the pressure relief lid 1.
Although the pressure release cover 15 is provided flush with the outer surface of the pressure release cover 15, it is difficult to open the pressure release cover 15 from the outside, thereby preventing tampering.

It should be noted that this invention is not limited to the above-mentioned embodiment, and can be arbitrarily modified without departing from the spirit of this invention, such as providing the pressure relief hole 5 on the side of one of the switches. It is.

Effects of the device As detailed above, this device allows the pressure relief cover of the pressure relief hole to open outward when the internal pressure of the switch increases, and the released gas to be released toward the rear of the switch along the guide part. can.

During this pressure release, the gap between the pressure release cover and the front edge of the pressure release hole is covered by the shielding plate, so
The pressure relief gas does not escape forward through the gap between the pressure relief cover and the front edge of the pressure relief hole, and the pressure of the gas can always be released to the rear of the switch.

Furthermore, because the pressure release lid does not expose the hinge and guide parts to the outside, they will not be damaged by external mischief, and you can always expect a smooth release operation. It is possible to prevent public disasters without causing damage to the public.

[Brief explanation of the drawing]

Fig. 1 is a front view of a multi-circuit switch according to an embodiment of this invention, Fig. 2 is a partially cutaway side view, Fig. 3 is a partially omitted plan sectional view, and Fig. 4a is an exploded view. FIG. 4b is a plan sectional view of the main parts of the multi-circuit switch when the pressure relief cover is at the initial opening position; FIG.
6 is a perspective view of the guide plate, FIG. 7 is a perspective view of the guide plate, and FIG. 8 is a perspective view of the pressure relief cover. 1...Outer box, 2...Opening/closing door, 3...Side wall, 4...
...Side wall, 5...Pressure hole, 6...Abutment part, 8A, 8
B, 8C... Guide plate, 10, 12... Connection plate,
11, 13... Auxiliary guide plate, 15... Pressure relief lid,
16... Reinforcement frame, 19... Shielding plate, 22... Angle regulating rod, 24... Coil spring.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A pressure relief hole 5 communicating with the inside and outside is provided on the wall surface of the outer box 1 of the switch which has an opening/closing door 2 on the front side, and a front groove 30a and a rear groove are provided on the periphery of the pressure relief hole 5. Groove 30b
and a connecting groove 30c that connects both the front and rear grooves 30a, 30b,
A pressure relief lid 15 covering the pressure relief hole 5 and the groove 30 is rotatably supported with respect to the outer box 1 by a hinge 14 housed in the front groove 30a, and a pressure relief gas is provided in the rear groove 30b. A guide part 8 that guides the switch to the rear is housed and arranged, and the pressure relief lid 1
5 and the front edge of the pressure relief hole 5 is provided with a flexible shielding plate 16a for shielding a gap between the two. 2 The pressure release lid 15 is provided on both left and right sides or one side of the outer box 1.
The structure of the pressure relief hole of the multi-circuit switch described in 2.