JP2012109060A - Pressure release device of gas-insulated apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve internal gas discharging efficiency when an internal pressure rises, by increasing an area of a pressure release plate including an opening.SOLUTION: A pressure release device of a gas-insulated apparatus comprises: a flange plate 3 constituting a container which houses an electric device and has an insulating gas sealed therein; an opening 4 provided in the flange plate 3; a pressure release plate 5 for closing the opening 4; an O-ring 6 provided between the pressure release plate 5 and the flange plate 3 so as to surround the opening 4; a band plate 7 for fixing the pressure release plate 5 to the flange plate 3; and a reinforcing member 11 fixed to the outside of the pressure release plate 5 by a spot-welded fixing part 10.

Description

  Embodiments described herein relate generally to a pressure relief device for a gas insulating device such as a gas insulating cubicle in which an insulating gas is sealed in a container.

  Conventionally, for gas-insulated equipment in which an insulating gas such as sulfur hexafluoride gas is sealed in the container, when the internal pressure rises abnormally due to a short-circuit accident, etc. A pressure relief device for releasing the internal gas whose pressure has been increased is provided (for example, see Patent Document 1).

  As shown in FIG. 4, this type of pressure relief device is provided with a pressure relief device 2 at a predetermined position such as the back surface of a rectangular container 1 that houses an electrical device such as a circuit breaker. As shown in FIG. 5, the pressure release device 2 includes a rectangular opening 4 provided in the flange plate 3 having a thickness of about 10 mm, and a rectangular discharge having a thickness of 1 to 2 mm that closes the opening 4. A pressure plate 5, an O-ring 6 provided so as to surround the opening 4, and a plate-like band plate 7 that fixes the pressure release plate 5 to the flange plate 3 are configured.

  The band plate 7 is locked to the flange plate 3 on one side by the pressure release plate 5 and on the other side by bolts 8. The three sides of the pressure relief plate 5 are each fixed by a band plate 7, but the remaining one side is directly fixed to the flange plate 3 by a bolt 8.

  Thereby, when a pressure rise occurs in the container 1, the thin pressure release plate 5 starts to deform so as to swell first, and comes off from one side of the strip 7. Then, the opening 4 is opened, the internal gas whose pressure has been increased is released, and damage and scattering of the container 1 can be prevented. Further, since one side of the pressure release plate 5 is fixed by the bolt 8, even if the three sides are detached from the band plate 7, they are not scattered.

JP 2010-98839 A

The above-described conventional pressure relief device for gas insulation equipment has the following problems.
When the insulating gas is sealed in the container 1, a vacuum pump is connected and the inside of the container 1 is once brought into a vacuum state with a predetermined degree of vacuum. Then, a gas cylinder is connected and the insulating gas is sealed up to a predetermined pressure. At this time, similarly to the container 1, the pressure relief device 2 receives a pressure of about 1 atm from the outside in a vacuum state. In particular, since the pressure relief plate 5 is formed of a thin plate, it must be able to withstand this negative pressure, and it is difficult to increase the area of the pressure relief plate 5 including the opening 4.

  On the other hand, when the internal pressure increases due to a short circuit accident or the like, it must be released in a short time, and it has been desired to increase the area of the pressure release plate 5 including the opening 4. However, it must be able to withstand a negative pressure in a vacuum state, and it has been difficult to improve the discharge efficiency of the internal gas whose pressure has increased.

  The present invention has been made in order to solve the above-described problem. The pressure relief device for a gas insulating device is capable of increasing the area of the pressure relief plate including the opening and releasing the internal gas in a short time when the internal pressure rises. The purpose is to provide.

  In order to achieve the above object, a pressure relief device for a gas-insulated device according to an embodiment surrounds an opening provided in a container that houses an electrical device, a pressure relief plate that closes the opening, and the opening. An O-ring provided between the pressure release plate and the container, a band plate for fixing the pressure release plate to the container, and a reinforcing member fixed to the outside of the pressure release plate by a spot welding fixing portion. It is characterized by that.

The front view which shows the structure of the pressure release apparatus of the gas insulation apparatus which concerns on Example 1 of this invention. Sectional drawing explaining operation | movement of the pressure release apparatus of the gas insulation apparatus which concerns on Example 1 of this invention. The front view which shows the structure of the pressure release apparatus of the gas insulation apparatus which concerns on Example 2 of this invention. The perspective view which shows the external shape of a gas insulation apparatus. The front view which shows the structure of the pressure release apparatus of the conventional gas insulation apparatus.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a pressure relief device for a gas insulating device according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a front view showing a configuration of a pressure release device for a gas insulated device according to a first embodiment of the present invention, and FIG. 2 explains an operation of the pressure release device for the gas insulated device according to a first embodiment of the present invention. It is sectional drawing. In FIG. 1 and FIG. 2, the same components as those in the prior art are denoted by the same reference numerals. Since the outer shape of the gas insulation device is the same as the conventional one, the description thereof is omitted.

  As shown in FIG. 1, the pressure relief device 2 includes a rectangular opening 4 provided in a flange plate 3 having a thickness of about 10 mm, and a rectangular discharge having a thickness of 1 to 2 mm that closes the opening 4. A pressure plate 5, an O-ring 6 provided between the pressure release plate 5 and the flange plate 3 so as to surround the opening 4, a plate-like band plate 7 that fixes the pressure release plate 5 to the flange plate 3, and the pressure release plate 5. The reinforcing member 11 is fixed to the center of the opening 4 by a spot welding fixing portion 10 such as spot welding. The flange plate 3 becomes a part of the container 1.

  The reinforcing member 11 is slightly longer than the width of the inner periphery of the opening 4 and has a U-shaped cross section from the viewpoint of weight reduction and strength, but may be a plate shape or a rod shape. The band plate 7 is locked to the flange plate 3 on one side by the pressure release plate 5 and on the other side by bolts 8. The three sides of the pressure relief plate 5 are each fixed by a band plate 7, but the remaining one side is directly fixed to the flange plate 3 by a bolt 8.

  Next, the operation of the reinforcing member 11 will be described with reference to FIG.

  First, when the inside of the container 1 is evacuated to enclose the insulating gas, the pressure release plate 5 receives a downward pressure as shown in FIG. However, since both ends of the reinforcing member 11 are hooked on the opening 4 end and the center is fixed by the spot welding fixing portion 10, the pressure release plate 5 can be prevented from being deformed downward in the figure. . That is, deformation of the pressure release plate 5 in the container 1 is prevented. Spot welding may be circular, elliptical, or belt-shaped, and has a predetermined welding strength that can withstand negative pressure.

  Next, when the internal pressure rises, as shown in FIG. 2B, the pressure release plate 5 is deformed upward in the figure, and the reinforcing member 11 also moves in the upward direction with the fixed portion 10 as the apex. To do. When the pressure further increases, one side of the pressure release plate 5 is detached from the strip plate 7 and the internal gas is released to the outside from the opening 4. This is not affected by the reinforcing member 11 and becomes the same pressure release as before.

  Thereby, the deformation of the pressure release plate 5 in a vacuum state can be prevented without affecting the operation of the pressure release, so that the area of the pressure release plate 5 including the opening 4 can be increased. For this reason, internal gas can be discharge | released outside in a short time, and damage, scattering, etc. of the container 1 can be prevented.

  Even if the reinforcing member 11 is shorter than the width of the opening 4, the reinforcing member 11 itself has a certain area, so that deformation in the container 1 can be prevented. Further, although the fixing portion 10 is best because the central portion of the opening 4 has little influence on the deformation of the pressure release plate 5, if it is provided inside, the deformation can be prevented, and the influence on the pressure release operation is also exerted. It can be suppressed.

  According to the pressure release device of the gas insulation apparatus of the first embodiment, the reinforcing member 11 is fixed to the outside of the pressure release plate 5 by the spot welding fixing portion 10, so that the pressure release plate 5 is inside the container 1 in a vacuum state. Even if it tries to be deformed in the direction, the reinforcing member 11 can prevent the deformation. For this reason, the area of the pressure release plate 5 including the opening 4 can be increased, and the internal gas release efficiency when the internal pressure rises can be improved.

  Next, a pressure relief device for a gas insulating device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a front view illustrating a configuration of a pressure relief device for a gas insulating device according to a second embodiment of the present invention. The second embodiment is different from the first embodiment in that a scattering prevention bar is provided. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, a scattering prevention cover 12 having a U-shaped cross section is fixed to the outside of the reinforcing member 11 with bolts 8. The scattering prevention cover 12 has a height that does not affect the deformation of the pressure release plate 5.

  According to the pressure relief device for gas insulating equipment of the second embodiment, in addition to the effects of the first embodiment, the reinforcing member 11 can be prevented from scattering.

  According to the embodiment as described above, the area of the pressure release plate including the opening can be increased in the pressure release device that is in a pressurized state through a vacuum state, and the internal gas release efficiency when the internal pressure rises Can be improved.

Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Container 2 Pressure release apparatus 3 Flange plate 4 Opening part 5 Pressure release plate 6 O-ring 7 Band plate 8 Bolt 10 Fixing part 11 Reinforcement member 12 Splash prevention cover

Claims (4)

An opening provided in a container for storing electrical equipment;
A pressure relief plate for closing the opening;
An O-ring provided between the pressure relief plate and the container so as to surround the opening;
A band plate for fixing the pressure relief plate to the container;
A reinforcing member fixed to the outside of the pressure release plate by a fixed portion of spot welding;
A pressure relief device for gas insulation equipment, comprising:   The pressure relief device for a gas insulating device according to claim 1, wherein the fixing portion is a central portion of the opening.   The pressure relief device for a gas insulating device according to claim 1 or 2, wherein the reinforcing member has a U-shaped cross section.   The pressure relief device for a gas insulating device according to any one of claims 1 to 3, wherein a scattering prevention cover is provided outside the reinforcing member.

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