JP2006340557A - Gas-insulated instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a gas-insulated instrument in which the generation of corona can be prevented without leaving air in an annular groove formed on a disc-like member composed of an injection molded insulator by means of an O-ring fitted in the annular groove and blocking the leakage of insulating gas from a container filled with insulating gas, and the O-ring can be prevented from falling when the instrument is assembled. <P>SOLUTION: An elastic O-ring 1 having a circular cross-section is provided in order to block the leakage of insulating gas filling a container when it is compressed between a disc-like member 2 composed of an injection molded insulator and the container as the O-ring is fitted in an annular groove 2a formed around the central axis of the disc-like member 2 and jointed to the container. A curvature radius RA in the cross-section of the annular groove 2a touching the O-ring 1 matches that in the cross-section of the O-ring 1, and a linear portion E parallel with the central axis of the disc-like member 2 and touching the O-ring 1 is provided at the inside diameter portion of the annular groove 2a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sealing structure for a container filled with an insulating gas in a gas insulating device, in particular, a gas insulating device such as a gas insulated switchgear or a gas insulated bus device.

In the prior art, a sealant is applied to the groove of the ground metal portion, and the O-ring as a ring-shaped sealing member is held by the adhesive force (see, for example, Patent Document 1).
However, the sealant application work is expensive and takes a very long time because it is cured at the time of disassembly.

Further, in the prior art, there has been proposed one that prevents a dropout of the O-ring at the time of assembly by complicating the groove state of the ground metal portion on which the O-ring is mounted (see, for example, Patent Document 2).
However, since this shape cannot be released when the casting insulator is cast, it cannot be configured as a casting insulator.

JP 49-62844 A Japanese National Patent Publication No. 8-511079

The sealing structure used in conventional gas insulation equipment maintains the airtightness by fitting an O-ring as a ring-shaped sealing member with a circular cross section into a flange with a groove and connecting it to the other flange. ing.
However, since the O-ring falls off during the connection work, as described above, an adhesive member such as a sealant is applied to the groove or the groove shape is made special to prevent the dropout. However, neither is economical.
In addition, since the groove shape has a special structure, air remains in the groove and the O-ring in the gas insulating device, and the life of the insulator is shortened by corona generation.

  According to the present invention, an annular groove is formed by a ring-shaped sealing member that is fitted in an annular groove formed on a flat surface of a disk-shaped member made of cast insulating material and prevents leakage of insulating gas from an insulating gas filling container. An object of the present invention is to obtain a gas insulating device that can prevent the generation of corona without remaining air and can prevent the ring-shaped sealing member from falling off during assembly.

  In the gas insulating device according to the present invention, a container filled with an insulating gas, a disk-shaped member made of a cast insulator, and formed on the plane of the disk-shaped member so as to surround the central axis of the disk-shaped member. An annular groove, which is fitted into the annular groove, is joined to the container, and is compressed between the disk-like member and the container, thereby having an elasticity to prevent leakage of the insulating gas filled in the container. A ring-shaped sealing member having a circular cross section, the radius of curvature in the cross section of the annular groove contacting the ring-shaped sealing member is matched with the radius of curvature in the cross section of the ring-shaped sealing member, and the inner diameter portion of the annular groove Are provided with a straight portion parallel to the central axis of the disk-shaped member and in contact with the ring-shaped sealing member.

  According to the present invention, the ring-shaped sealing member that is fitted in the annular groove formed in the plane of the disk-shaped member made of the cast insulator and prevents leakage of the insulating gas from the insulating gas filling container is annular. It is possible to obtain a gas insulating device that can prevent the generation of corona without leaving air in the groove and can prevent the ring-shaped sealing member from falling off during assembly.

Embodiment 1 FIG.
An embodiment according to the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view showing a configuration of a gas insulation device including a gas insulation switchgear GIS according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state before assembly of the ring-shaped sealing member fitted into the annular groove in the embodiment according to the present invention. FIG. 3 is a cross-sectional view showing a state after assembly of the ring-shaped sealing member fitted into the annular groove in the embodiment according to the present invention.

In FIG. 1 which shows the structure in embodiment by this invention, O-ring 1 as a ring-shaped sealing member is the annular groove provided in the plane of the peripheral part in the disk-shaped member 2 comprised with a casting insulator. 2a. The O-ring 1 is made of a material such as an elastic rubber such as ethylene propylene rubber (EPM), nitrile rubber (NR), or chloropyrene rubber (CR).
Disk-shaped member 2 is bonded to the peripheral portion on the flange portion 31 of the ground metal container 3 as the conductive container insulating gas such as SF ₆ is filled includes an annular groove 2a. The O-ring 1 as a ring-shaped sealing member is compressed between the bottom surface of the annular groove 2a provided in the disk-shaped member 2 and the flange portion 31 of the ground metal container 3, and the disk-shaped member 2 and the ground metal container Insulating gas leakage from between the three flange portions 31 is sealed.
This disk-shaped member 2 insulates and supports a central conductor 6 that extends on the central axis AL, and is a disk-shaped that fits an O-ring 1 as a ring-shaped sealing member. The annular groove 2 a provided in the member 2 is provided on a circumference centered on the central axis AL of the disk-like member 2.
The peripheral edge portion of the disk-like member 2 where the annular groove 2 a is provided is sandwiched by the flange portions 31 forming a pair of the ground metal container 3 on both sides of the plane, and fastened by bolts 61 and nuts 62. By fastening with the bolt 61 and the nut 62, the O-ring 1 is compressed and held between the bottom of the annular groove 2 a and the flange portion 31 of the ground metal container 3 inside the annular groove 2 a provided in the disk-like member 2. The insulating gas leakage from between the plate member 2 and the flange portion 31 of the ground metal container 3 is sealed.

The state before the assembly of the O-ring 1 as a ring-shaped sealing member is shown in FIG.
The inner diameter dimension from the annular center in the free state of the O-ring 1 is set smaller than the inner diameter dimension from the central axis AL in the inner diameter portion 2x of the annular groove 2a, and the O-ring 1 as a ring-shaped sealing member is not assembled. In this state, it is fixedly held in close contact with the inner diameter portion 2x of the annular groove 2a in a form of being hooked by a linear portion E provided in the inner diameter portion 2x of the annular groove 2a.
The radius RA in the cross section of the O-ring 1 as the ring-shaped sealing member is coincident with the bottom surface radius RA of the annular groove 2 a provided in the disk-shaped member 2.
The annular groove 2a is provided with a linear portion E parallel to the central axis AL of the disc-like member 2 at the inner diameter portion 2x, thereby preventing the O-ring 1 from falling off.

  The disc-like member 2 is formed with a receding surface for constituting a gas passage 2p that communicates the annular groove 2a with the space inside the ground metal container 3.

Further, the outer diameter portion 2y of the annular groove 2a provided in the disk-shaped member 2 is provided with a tapered surface that assists in releasing the mold when the disk-shaped member 2 is cast. In the outer diameter portion 2y of the annular groove 2a, the radius RC in the cross section of the bottom of the annular groove 2a is set larger than the radius RA in the cross section of the O-ring 1.
The inner diameter portion 2x of the annular groove 2a is provided with a straight portion E and is not provided with a taper portion. However, since the insulating resin constituting the disk-shaped member 2 contracts toward the central axis AL during casting, the release at the inner diameter portion 2x of the annular groove 2a is performed without any trouble.

Here, RA to RC and D to H shown in FIG. 2 play the following roles.
RA: the cross-sectional radius of the O-ring 1 that is in close contact with the annular groove 2 a provided in the disc-like member 2.
RB: Cross-sectional curvature for preventing cracks during mold release.
RC: Residual air is prevented by making the radius of the O-ring 1 and the radius of curvature of the groove 2a substantially the same.
D: The radius of the O-ring 1 is substantially the same as the radius of curvature of the groove 2a, and the O-ring 1 is brought into close contact to prevent falling off and air remaining.
E: A straight portion for hooking the O-ring to the inner diameter of the groove.
F: Gap between gas filling and air venting.
G: The inner wall of the groove has no taper and prevents the O-ring from falling off. When the mold is released, the resin shrinks and leaves the mold.
H: The outer wall of the groove has a taper structure to ease the resin shrinkage and sticking to the mold during mold release.

The assembly process of the gas insulated switchgear GIS will be described.
Before assembly of the gas insulated switchgear GIS, the O-ring 1 as a ring-shaped sealing member is fitted into the inner diameter portion 2x of the annular groove 2a provided in the disk-shaped member 2. As described above, the inner diameter dimension from the annular center in the free state of the O-ring 1 is set smaller than the inner diameter dimension from the central axis AL in the inner diameter portion 2x of the annular groove 2a. Due to its own elasticity, it is pressed against the inner diameter portion 2x of the annular groove 2a. A straight line portion E is formed in the inner diameter portion 2x of the annular groove 2a, and the o-ring 1 is reliably prevented from falling off the annular groove 2a. Therefore, the assembling and mounting operation of the disk-shaped member 2 having the annular groove 2a into which the O-ring 1 is fitted and mounted can be quickly and accurately advanced.
In this state, the cross-sectional radius RA of the O-ring 1 coincides with the radius RA of the bottom curvature of the annular groove 2a in the inner diameter portion 2x, and both are in close contact while maintaining the same radius. In the outer diameter portion 2y of the annular groove 2a, a space is generated between the outer diameter portion 2y of the annular groove 2a and the surface of the outer diameter portion of the O-ring 1. As shown in FIG. 2, the lower portion of the O-ring 1 protrudes from the lower surface of the flat portion of the disc-like member 2.

At the time of assembling the gas insulated switchgear GIS, the O-ring 1 as a ring-shaped sealing member is fitted and held in the annular groove 2a of the disk-shaped member 2 so as to be integrated with the disk-shaped member 2, and the ground metal container 3 The flange portion 31 is pressed into contact with the annular groove 2a of the disk-like member 2 and the flange portion 31 of the ground metal container 3 is tightly clamped.
In this assembling process, air existing between the inner diameter portion of the O-ring 1 and the inner diameter portion 2x of the annular groove 2a is discharged to the internal space of the grounded metal container 3 through the gas passage 2p. It does not remain inside the annular groove 2a.

After assembly of the gas insulated switchgear GIS, the O-ring 1 as a ring-shaped sealing member is in the state shown in FIG.
The O-ring 1 has an inner diameter portion in close contact with the inner diameter portion 2x of the annular groove 2a, an outer diameter portion in close contact with the outer diameter portion 2y of the annular groove 2a, and a lower portion to the flange portion 31 of the ground metal container 3. The contact is brought into pressure contact, and the sealing at the joint surface between the disk-shaped member 2 and the flange portion 31 of the ground metal container 3 is surely performed.
The internal space of the ground metal container 3 is evacuated after the assembly work is completed, and the internal space of the ground metal container 3 is filled with an insulating gas such as SF ₆ .

The embodiment according to the present invention has the following configuration.
(1) Make the inner diameter of the O-ring 1 smaller than the inner diameter of the annular groove 2a and hook it into the groove.
(2) The disk-like member 2 made of an insulating material is not machined, and is finished only by release.
(3) 0.05 to between the disk-shaped member 2 made of an insulator in the inner diameter direction of the annular groove 2a and the flange portion 31 of the ground metal container 3 for gas filling and air escape in the annular groove 2a A clearance of about 0.2 mm is provided (F section).
(4) Since the disk-shaped member 2 made of an insulator is a cast object, the annular groove 2a has a taper shape on the inner diameter side and a taper shape on the outer diameter side so that releasability can be secured (G portion, H part).
(5) A radius of curvature RA comparable to that of the O-ring 1 is provided on the groove inner diameter / resin side of the annular groove 2a to improve adhesion (A part, C part, D part).
(6) A linear portion that hooks the O-ring 1 is configured (E portion) as a curvature having a radius as small as possible on the groove inner diameter / gas side of the annular groove 2a.

  In an embodiment according to the present invention, in a disk-shaped member 2 made of a cast insulator that is hermetically sealed, an O-ring 1 having a general shape has a cross-sectional radius of the O-ring 1 at the corner of a groove having a substantially rectangular cross section. By hooking it on the inner diameter side of the groove with the same roundness as that of, it prevents dropout and corona generation during assembly.

  According to the embodiment of the present invention, a conductive container made of a grounded metal container 3 filled with an insulating gas, a disk-shaped member 2 made of a cast insulator, and the circular plate on the plane of the disk-shaped member 2. An annular groove 2a formed surrounding the central axis AL of the plate-like member 2, and a conductive material composed of the disk-like member 2 and the ground metal container 3 when fitted into the annular groove 2a and joined to the ground metal container 3. A ring-shaped sealing member having a circular cross section made of an O-ring 1 having elasticity that prevents leakage of insulating gas filled in the conductive container made of the grounded metal container 3 by being compressed with the conductive container. The radius of curvature RA in the cross section of the annular groove 2a in contact with the ring-shaped sealing member having the circular cross section made of the O-ring 1 coincides with the radius of curvature RA in the cross section of the ring-shaped sealing member having the circular cross section of the O-ring 1 With letting In addition, a linear portion E that is in parallel with the central axis AL of the disk-like member 2 and is in contact with the ring-like sealing member having a circular cross section made of the O-ring 1 is provided on the inner diameter portion 2x of the annular groove 2a. A ring that can be prevented from falling off when the stopper member is assembled and that prevents leakage of the insulating gas from the insulating gas filling container by being fitted in an annular groove formed on the flat surface of the disk-shaped member made of cast insulating material. A gas insulating device capable of preventing the generation of corona without leaving air in the annular groove by the shaped sealing member can be obtained.

  Further, according to the embodiment of the present invention, in the configuration of the preceding paragraph, since the tapered portion is provided on the outer diameter portion of the annular groove to assist the mold release when casting the disk-shaped member, the casting insulation A corona that does not leave air in the annular groove by a ring-shaped sealing member that is fitted in an annular groove formed in the plane of the disk-shaped member made of a material and prevents leakage of insulating gas from the insulating gas filling container Generation | occurrence | production can be blocked | prevented, the drop-off | omission at the time of an assembly of a ring-shaped sealing member can be prevented, and the gas insulation apparatus which can perform casting of a disk-shaped member appropriately and easily can be obtained.

  Furthermore, according to the embodiment of the present invention, in the configuration of the preceding paragraph, since the gas passage communicating with the inside of the container is provided between the annular groove and the container, a circle formed of a casting insulator is provided. Corrosion generation can be prevented without remaining air in the annular groove by a ring-shaped sealing member that is fitted in an annular groove formed in the plane of the plate-like member and prevents leakage of insulating gas from the insulating gas filling container, It is possible to obtain a gas insulating device that can prevent the ring-shaped sealing member from falling off during assembly, and that can appropriately and reliably remove air from the annular groove and fill the annular groove with gas.

It is a longitudinal cross-sectional view which shows the structure in embodiment by this invention. It is sectional drawing which shows the state before the assembly of the ring-shaped sealing member fitted by the annular groove in embodiment by this invention. It is sectional drawing which shows the state after the assembly of the ring-shaped sealing member fitted by the annular groove in embodiment by this invention.

Explanation of symbols

1 O-ring 1, 2 Disc-shaped member, 3 Ground metal container, 31 Flange, 6 Center conductor, 61 bolt, 62 Nut.

Claims (3)

  A container filled with an insulating gas, a disk-shaped member made of cast insulation, an annular groove formed around the central axis of the disk-shaped member on the plane of the disk-shaped member, and fitted into the annular groove A ring-shaped sealing member having a circular cross section having elasticity that prevents leakage of insulating gas filled in the container by being joined to the container and compressed between the disk-shaped member and the container A radius of curvature in a section of the annular groove in contact with the ring-shaped sealing member is made to coincide with a radius of curvature in a section of the ring-shaped sealing member, and a central axis of the disk-shaped member is arranged on an inner diameter portion of the annular groove A gas insulating device characterized in that a straight portion in parallel with the ring-shaped sealing member is provided.   The gas insulating device according to claim 1, wherein a taper portion that assists in mold release is provided at the outer diameter portion of the annular groove when casting the disk-shaped member. The gas insulation apparatus according to claim 1, wherein a gas passage communicating with the inside of the container is provided between the annular groove and the container.

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