JPH033952Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) This invention relates to a pressure relief structure in a gas switch.

(Prior art) Conventionally, in gas switches in which the switching device is housed in the main body case, opening/closing is required to prevent the internal pressure from rising abnormally due to an internal short circuit or the like, which could cause the entire device to explode. A pressure relief hole is provided in the wall surface of the main body case of the device, an O-ring mounting portion is provided on the periphery of the pressure relief hole, and the O-ring is tightly fitted to the inner peripheral surface of the O-ring mounting portion via the O-ring. The pressure relief lid is made up of a cylindrical part with a bottom and a plurality of mounting pieces protruding from the cylindrical part, and is fixed to the main body case with bolts through long holes made through the mounting pieces. A structure in which the pressure relief hole is sealed is proposed (Utility Model Application Publication No. 60-94748).

(Problems to be solved by the invention) As mentioned above, the conventional mounting structure for supporting the pressure relief lid is such that the pressure relief lid is mounted and supported outside the main body case and is designed to withstand the internal pressure of the main body case. ,
On the outside of the main body case, the structure for attaching the pressure release lid is exposed to the outside, and the support structure thereof is complicated. Additionally, since the support structure of the pressure relief lid is exposed to the outside, if something from the outside collides with the mounting bolt and the support structure is damaged, there is a risk that the sealing structure of the pressure relief hole may be broken and gas leakage may occur. .

Structure of the invention (Means for solving the problem) This invention was made to solve the above-mentioned problem. With transparent pressure holes,
An O-ring attachment part is provided on the periphery of the pressure relief hole, and a pressure relief cover is tightly fitted to the inner circumferential surface of the O-ring attachment part via the O-ring, and the tip end is provided on the inner surface of the pressure relief hole. A locking plate is provided which is always locked on the inner surface of the peripheral edge of the pressure relief hole and is released when the internal pressure of the main body case rises, and which connects the outer surface of the pressure relief cover and the main body case to prevent the pressure relief cover from flying off. The gist is that the components are connected by a shatter-preventing member, and that the shatter-preventing member is provided with a bendable fragile portion at its attachment end to the main body case.

(Function) With the above configuration, when an internal short circuit accident such as a short circuit between phases occurs within the main body case, the pressure within the main body case increases, and as a result, the pressure relief lid is pressed outward. Then, the engagement between the peripheral edge of the pressure relief hole and the locking plate is released, the seal between the pressure relief hole and the pressure relief cover is released, and the pressure relief cover is prevented from scattering by the scattering prevention member. , the gas inside the case is released to the outside through the same pressure relief hole.

(Example) Hereinafter, an example in which this invention is embodied in a portable gas switch will be described with reference to FIGS. 1 to 6.

Main body case 1 of switch S filled with arc-extinguishing gas
is formed vertically, and bushings 2 of each phase are arranged vertically at both ends thereof, and the bushings 2 are adapted to be fitted and connected with a cable (not shown) provided with a connecting elbow. . A mechanism case 3 is provided at the top of the main body case 1, and an operation shaft 4 rotatably protrudes from the front of the mechanism case 3, and an operation handle 5 is fixed to the protruding end. ing. And the same operation handle 5
By rotating the , each phase opening/closing device (not shown) in the main body case 1 can be opened/closed via an operating mechanism (not shown) housed in the mechanism case 3 .

The main body case 1 has a rectangular frame-shaped protective frame 6 fixed to both upper and lower sides of the main body case 1 via mounting brackets 7, and a hooking bracket 8 having a U-shaped cross section on the upper back side of the main body case 1. is fixed. On the other hand, a mounting member 10 is attached to the utility pole P in advance by a mounting rope 9 made of a chain, and an L-shaped hooking protrusion 11 fixed to the upper part of the mounting member 10 is used to hook the switch S. It is inserted and latched into the stopper 8 from below. Further, an abutting member 12 is provided protruding from the lower front surface of the mounting member 10, and the abutting member 12 abuts and supports the lower back surface of the main body case 1 of the switch S. Further, a clamp mechanism 13 is provided on the lower surface of the mounting member 10, and the clamp mechanism 13 is removably hooked onto a hook member 14 provided on the lower surface of the main body case 1.

A circular pressure relief hole 15 is transparently provided in the center of the back surface of the main body case 1 of the switch S, which communicates the inside and outside. An O-ring mounting ring 16 as an O-ring mounting portion is provided on the outer circumferential surface of the pressure relief hole 15 of the main body case 1.
is fixed by welding or the like, and an O-ring 17 is fitted between the protrusion 16a protruding inwardly of the O-ring attachment ring 16 and the back surface of the main body case 1. A pair of mounting bolts 18 are installed on the back surface of the main body case 1 on one side of the O-ring mounting ring 16 .

The pressure relief hole 15 is connected to the O-ring mounting ring 16.
A pressure relief lid 19 is tightly fitted with a ring 17 interposed therebetween, thereby providing a hermetic seal. The inner surface of the pressure relief lid 19 is arranged flush with the inner surface of the main body case 1, and
A T-shaped locking support plate 20 is fixed with screws 21. That is, the locking support plate 20 extends along the direction in which the pair of mounting bolts 18 are lined up, with a pair of distal ends facing in opposite directions, and the remaining distal ends are aligned with the mounting position of the mounting bolts 18. is extended in the opposite direction. The pressure release lid 19 is attached to the main body case 1 against the internal pressure of the case by locking the three end portions of the locking support plate 20 to the inner surface of the main case 1. Incidentally, the pressure relief lid 19 is assembled when the main body case 1 is assembled.

A scattering prevention member 22 made of a plate material is inserted into the mounting bolt 18 through a long hole 23 formed through the base end thereof, and the scattering prevention member 22 is fitted with a washer against a spacer 24 fitted into the mounting bolt 18. It is attached by tightening a nut 26 through 25. The distal end of the scattering prevention member 22 is formed into a circular shape corresponding to the pressure relief hole 15, and the pressure relief cover 19 is fastened to the inner surface thereof with screws 27. Further, an annular packing 28 is fixed around the pressure release lid 19 on the inner surface of the scattering prevention member 22, and is closely attached to the O-ring mounting ring 16 to prevent dust and protect the O-ring 17 from ultraviolet rays, impurities, and rain. It is provided to protect against air pollution and improve the stability and reliability of airtightness.

Further, a side wall 29 facing the main body case 1 is formed on the periphery of the scattering prevention member 22, and a cut groove 30 is formed as a fragile portion between the fixing position of the pressure relief lid 19 and the mounting bolt 18 on the side wall 29. is formed. When the internal pressure of the main body case 1 increases and the pressure release lid 19 is pressed outward, the scattering prevention member 22 has its base end slidably deformed within the range allowed by the elongated hole 23 due to the pressure. It is bent outward at the kerf 30.

Now, in the pressure relief structure of the switch S configured as described above, when an internal short circuit accident such as a phase-to-phase short circuit occurs in the electrode (not shown) disposed inside the main body case 1, the pressure inside the main body case 1 increases. As a result, the pressure relief lid 19 is pressed outward. Then, the distal end of the locking support plate 20 is bent and deformed as shown in FIG. 5, and the scattering prevention member 22 is slid and deformed within the range allowed by the elongated hole 23 thereof.

Furthermore, when the tip of the locking support plate 20 is deformed and the locking with the inner surface of the main body case 1 is released,
As shown in FIG.
Since the base end is bent outward at 0, the pressure relief lid 1
9 is rapidly moved outward, thereby causing the pressure relief hole 1
5 is opened and the gas inside the main body case 1 is released to the outside.

As a result, the entire main body case 1 will not explode and cause damage to other equipment or personal storage, and the pressure relief lid 19 that has left the pressure relief hole 15 will be connected with the scattering prevention member 22. This prevents scattering. Moreover, the pressure release lid 19 is not supported by the scattering prevention member 22, but is supported by a locking support plate 20 that locks onto the inner surface of the main body case 1 against the internal pressure of the main body case 1. Therefore, even if an object collides with the scattering prevention member 22 from the outside, the sealing structure of the pressure relief lid 19 for the pressure relief hole 15 will not be broken.

In addition, in this embodiment, the pressure relief hole 15 is provided on the back side of the switch S, that is, on the utility pole P side.
The pressure relief gas from the pressure relief hole 15 does not cause any damage to personal storage.

Note that this invention is not limited to the above-mentioned embodiments, and can be arbitrarily modified without departing from the spirit of this invention.

Effects of the device As detailed above, this device is provided on the inner surface of the pressure relief lid, and its tip is always locked on the inner surface of the periphery of the pressure relief hole, and is released when the internal pressure of the case increases. Since the locking support plate supports the pressure relief lid against the internal pressure of the main body case, the support structure for the pressure relief lid can be of a simple structure, and it also prevents objects from falling onto the scattering prevention member from the outside. Even in the event of a collision, the locking support plate is fixed to the inner surface of the pressure relief lid, and there is no risk of the support structure being damaged, so that the sealing structure of the pressure relief lid for the pressure relief hole will not be broken. Furthermore, since the pressure relief lid cannot be removed from the outside, there is no risk of damage if it is removed by mistake, and this is an excellent invention for industrial use.

[Brief explanation of the drawing]

Figure 1 is an overall side view of a switch that embodies this idea, Figure 2 is a rear view of the main parts of the switch, and Figure 3 is a cross-section showing how the pressure relief cover is assembled to the main body case. 4 are rear views of the pressure relief lid and scattering prevention member, and FIGS. 5 and 6 are sectional views and side views for explaining the function of the pressure relief structure. 1... Main body case, 15... Pressure relief hole, 16...
O-ring mounting ring (O-ring mounting part), 17...O
Ring, 19... Pressure relief lid, 20... Locking support plate,
22...Scatter prevention member, 29...Side wall, 30...
Cut groove as a weak part, S...Switch.

Claims (1)

[Claims for Utility Model Registration] 1. A pressure relief hole 15 is transparently provided in the wall surface of the main body case 1 of the switch S, and an O-ring attachment portion 16 is provided on the periphery of the pressure relief hole 15, and the O-ring attachment portion A pressure relief lid 19 is tightly fitted to the inner peripheral surface of the pressure relief hole 16 via an O-ring 17, and the pressure relief lid 19 is always locked to the inner surface of the peripheral edge of the tip pressure relief hole 15, and the case is A locking support plate 20 is provided which is released when the internal pressure rises, and the outer surface of the pressure relief lid 19 and the main body case 1 are connected by a scattering prevention member 22 that prevents the pressure relief lid 19 from scattering. A pressure relief structure for a gas switch, characterized in that a bendable fragile part 30 is provided at the end of the member 22 attached to the main body case 1. 2. The locking support plate 20 is formed in a T-shape and is locked to the peripheral edge of the pressure release hole 19 at three points on each tip end, as set forth in claim 1 of the utility model registration claim. Pressure relief structure of gas switch.