JP2012217252A - Pressure discharging device for gas insulation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure discharging device which withstands negative pressure during vacuum drawing and has an opening having a large area that improves the discharging efficiency when the pressure is increased.SOLUTION: A pressure discharging device includes: a container housing an electric apparatus such as a breaker; a flange plate 3 provided at a predetermined position of the container; an opening 4 provided at the flange plate 3 and discharging an internal gas; reinforcement plates 9a, 9b dividing the opening 4 into multiple spaces; a pressure discharge plate 5 closing the opening 4; an o ring 6 provided between the pressure discharge plate 5 and the flange plate 3 so as to enclose an outer periphery of the opening 4; and a band plate 7 fixing the pressure discharge plate 5 to the flange plate 3 by bolts 8a.

Description

  Embodiments of the present invention relate to a pressure relief device for a gas insulating device in which an insulating gas is enclosed in a container that houses an electric device such as a circuit breaker.

  Conventionally, for gas-insulated equipment in which an insulating gas such as sulfur hexafluoride gas is sealed in the container, the internal gas is stored in the container to prevent damage to the container when the internal pressure rises abnormally due to a short circuit accident or the like. A pressure relief device that discharges to the outside is provided (for example, see Patent Document 1).

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

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

  Thereby, when a pressure rise occurs in the container 1, the pressure release plate 5 starts to deform so as to swell outward, and when the pressure release plate 5 comes off from one side of the three strips 7, the internal gas is released, and the container 1 damage can be prevented. Since one side of the pressure release plate 5 is fixed to the flange plate 3 with the bolts 8b, even if the three sides are detached from the strip plate 7, they are not scattered.

  When the insulating gas is sealed in such a container 1, first, the inside of the container 1 is once evacuated to a predetermined degree of vacuum. Next, a gas cylinder is connected, and the insulating gas is sealed up to a predetermined pressure. At this time, also in the pressure release device 2, the same pressure as that of the container 1 is applied and a pressure of about 1 atm is received from the outside. For this reason, it is desirable that the area of the pressure relief plate 5 including the opening 4 is small so as to withstand this negative pressure.

  On the other hand, when the internal pressure increases due to a short circuit accident or the like, it is desirable that the area of the pressure relief plate 5 including the opening 4 is large because it is necessary to release the internal gas in a short time. That is, enduring negative pressure and improving internal gas release efficiency are contradictory characteristics.

JP 2010-98839 A

  The problem to be solved by the present invention is to provide a gas insulating device capable of withstanding the negative pressure during evacuation even when the area of the pressure relief plate including the opening is increased and improving the efficiency of releasing internal gas when the pressure is increased. An object of the present invention is to provide a pressure relief device.

  In order to solve the above problems, a pressure relief device for a gas insulating device according to an embodiment includes a container for storing an electric device, an opening provided at a predetermined position of the container, and a reinforcing plate that partitions the opening into a plurality of portions. A pressure relief plate that closes the opening, an O-ring provided between the pressure relief plate and the container so as to surround an outer periphery of the opening, and a band plate that fixes the pressure relief plate to the container. Prepare.

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. Sectional drawing which shows the structure of the pressure release apparatus of the gas insulation apparatus which concerns on Example 2 of this invention. Sectional drawing which shows the structure of the pressure release plate 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 addition, in each figure, the same code | symbol was attached | subjected about the component similar to the past. Moreover, since the external shape of a gas insulation apparatus is the same as the past, the description is abbreviate | omitted.

  As shown in FIG. 1, a 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 pressure relief plate having a thickness of 1 to 2 mm that closes the opening 4. 5, an O-ring 6 provided so as to surround the outer periphery of the opening 4, a plate-like strip 7 that fixes the pressure release plate 5 to the flange plate 3, and the opening 4 that is fixed to the flange plate 3 in a cross shape. It is composed of reinforcing plates 9a and 9b that are divided into two. A reinforcing plate 9a is provided in the illustrated horizontal direction, and a reinforcing plate 9b is provided in the illustrated vertical direction.

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

  The shape of the reinforcing plates 9a and 9b may be either a honeycomb shape or a lattice shape, and the opening 4 is divided into a plurality of portions. However, the cross shape can be easily configured by fixing one reinforcing plate 9a at the center in the horizontal direction and one reinforcing plate 9b at the center in the vertical direction, and the divided areas are made equal. This is preferable. “Equivalent” includes dimension errors, assembly errors, and the like.

  Next, the movement of the pressure release plate 5 will be described with reference to FIG. The upward direction in the figure is the outside, and the downward direction in the figure is the inside of the box.

  As shown in FIG. 2, when a vacuum is applied to enclose the insulating gas, an external pressure P is applied to the pressure release plate 5, and the pressure release plate 5 is deformed so as to enter the lower side in the drawing. However, it comes into contact with the reinforcing plate 9a, the deformation stops, damage can be prevented, and a vacuum state can be maintained.

  On the other hand, when the pressure rises inside, the pressure release plate 5 starts to deform so as to swell outward, and when the pressure release plate 5 comes off from one side of the strip plate 7, the opening 4 is opened and the internal gas is released. Since the area of the opening 4 can be increased, it can be released in a short time. The area of the reinforcing plate 9a is small and hardly affects the discharge. Since one side of the pressure release plate 5 is fixed to the flange plate 3 with the bolts 8b, even if the three sides are separated from the strip plate 7, they are not scattered.

  When the material of the container 1 or the flange plate 3 is a steel plate and the pressure release plate 5 is made of aluminum, the pressure release plate 5 has a lower melting point and starts to melt first by an internal arc. For this reason, the internal gas can be released in a shorter time.

  According to the pressure relief device of the gas insulation apparatus of the first embodiment, since the opening 4 is partitioned into a plurality by the reinforcement plates 9a and 9b, the pressure relief plate 5 is deformed during evacuation, but the reinforcement plates 9a and 9b. It is possible to keep the vacuum state by abutting on the surface to prevent deformation. For this reason, even if the area of the opening 4 is increased, it can withstand negative pressure, and the internal gas release efficiency 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 FIGS. FIG. 3 is a cross-sectional view illustrating a configuration of a pressure release device for a gas insulated device according to a second embodiment of the present invention, and FIG. 4 illustrates a configuration of a pressure release plate of the pressure release device for the gas insulated device according to a second embodiment of the present invention. FIG. The second embodiment differs from the first embodiment in that a slit is provided in the pressure relief plate. In each figure, 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, slits 10a and (10b) are provided on the surface of the pressure release plate 5 facing the reinforcing plates 9a and (9b). As shown in FIG. 4, the widths of the slits 10a and 10b are narrower than the widths of the reinforcing plates 9a and 9b indicated by the two-dot chain lines.

  As a result, even if the pressure release plate 5 is deformed so as to be recessed during negative pressure, the portions of the slits 10a and (10b) come into contact with the surfaces of the reinforcing plates 9a and (9b) to provide the slits 10a and (10b) It is possible to prevent the mechanical strength from being reduced. On the contrary, when the internal pressure increases, the pressure release plate 5 is deformed so as to swell, and is easily damaged at the slits 10a and 10b, so that the internal gas can be released in a short time.

  According to the pressure relief device for gas insulating equipment of the first embodiment, in addition to the effects of the first embodiment, the internal gas discharge efficiency can be further improved by the slits 10a and 10b.

  According to the embodiment as described above, it is possible to enlarge the opening through which the internal gas is discharged, and the discharge efficiency 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 scope 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 8a, 8b Bolt 9a, 9b Reinforcement plate 10a, 10b Slit

Claims (5)

A container for storing electrical equipment;
An opening provided at a predetermined position of the container;
A reinforcing plate for partitioning the opening into a plurality of parts;
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 outer periphery of the opening;
A band plate for fixing the pressure relief plate to the container;
A pressure relief device for gas insulation equipment.   2. The pressure release device for a gas insulating device according to claim 1, wherein the pressure release plate is made of a metal material having a melting point lower than that of the container.   The pressure relief device for a gas insulating device according to claim 1 or 2, wherein the reinforcing plate has a cross shape.   The pressure relief device of the gas insulation apparatus according to any one of claims 1 to 3, wherein a slit is provided on a surface of the pressure relief plate facing the reinforcing plate.   The pressure relief device for a gas insulating device according to claim 4, wherein a width of the slit is narrower than a width of the reinforcing plate.

Images