JP2004207116A - Vacuum valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate mounting operation of other members such as bellows for impact absorption on flanges or the like. <P>SOLUTION: The vacuum valve is comprises a vacuum container 15 consisting of a valve insulating tube 11, a stationary side end plate 13a, and a movable side end plate 13b; a stationary side electrode 17a arranged in the vacuum container 15; a movable side switching-on stem 16b penetrating through the movable side end plate 13b and moving in axial direction by operating mechanism; a movable side electrode 17b installed at the tip end of the movable side switching-on stem 16b, contacting with and separated from the stationary side electrode 17a; the bellows 18 for movable side switching-on stem movement whose both ends are connected to the movable side switching-on stem 16b and the movable side end plate 13b; and a movable side end plate flange part 19 formed at the peripheral part of the plate-shaped movable side end plate 13b and connected to the other members such as the other flanges and plate bodies. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vacuum valve housed in, for example, a pressure vessel of a gas insulated switchgear filled with an insulating gas and used as a shutoff unit.
[0002]
[Prior art]
A conventional vacuum valve will be described with reference to FIG. 1a, 1b are a pair of insulating cylinders, 2a, 2b are seal rings of the opposed portions of both insulating cylinders 1a, 1b, 3 is a metal cylinder airtightly connected between both seal rings 2a, 2b, 4a, 4b are both insulating cylinders The fixed-side end plate and the movable-side end plate 1a, 1b at both ends are fixed-side electrodes attached to the tip of a fixed-side conductive rod 6a fixed to the fixed-side end plate 4a, and the fixed-side electrode 5b penetrates the movable-side end plate 4b. The movable-side electrode is attached to the tip of the movable-side conductive rod 6b so as to face the fixed-side electrode 5a.
[0003]
A bellows 7 has one end airtightly connected to the movable side end plate 4b and the other end airtightly connected to the movable side conductive rod 6b, and the inside of the vacuum vessel 8 is in a high vacuum.
[0004]
Reference numeral 9 denotes a mounting base attached to the movable side end plate 4b by welding or the like, and 10 denotes an airtight container one end of which is airtightly connected to the mounting base 9 via a sealing material. The inner surface side of the bellows 7 communicates with the inside of the airtight container 10 while maintaining airtightness, the movable conductive rod 6b is connected to the main circuit via a current collector, and the movable conductive rod 6b is And the movable side electrode 5b comes into contact with and separates from the fixed side electrode 5a (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-6-208820 (page 3, right column, FIG. 1)
[0007]
[Problems to be solved by the invention]
One end of the movable side end plate 4b of the conventional vacuum valve is connected to the insulating cylinder 1b, the other end is bent inward and bent, and the mounting base 9 is attached thereto by welding or the like. Therefore, there is a problem that the work of attaching other members to the movable side end plate 4b is complicated, and the work efficiency is poor.
[0008]
In addition, the impact force at the time of injection when the movable electrode 5b at the tip of the movable conductive rod 6b is joined to the fixed electrode 5a is applied to the joint between the fixed conductive rod 6a and the fixed end plate 4a. There is a problem that it is damaged and an airtight leak occurs.
[0009]
SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and has as its object to provide a vacuum valve which facilitates the work of attaching other members and prevents damage due to impact force at the time of insertion.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a vacuum valve of the present invention comprises:
A vacuum container composed of a valve insulating cylinder, a fixed end plate and a plate-shaped movable end plate in which both ends of the valve insulating cylinder are vacuum-sealed,
A fixed-side energizing shaft provided through the fixed-side end plate,
A fixed-side electrode provided at an end of the fixed-side energized shaft inside the vacuum vessel;
A movable-side energizing shaft that is provided through the movable-side end plate and moves in an axial direction by an operation mechanism outside the vacuum vessel;
A movable-side energizing shaft that is provided at an end of the movable-side energizing shaft inside the vacuum vessel and that comes into contact with and separates from the fixed-side electrode;
A movable-side energizing shaft movement bellows provided so as to surround the movable-side energizing shaft, one end of which is hermetically connected to the movable-side energizing shaft, and the other end of which is hermetically connected to the movable-side end plate;
And a movable end plate flange formed at a peripheral portion of the movable end plate and connected to another member such as another flange or a plate body.
[0011]
In the vacuum valve of the present invention configured as described above, the movable side end plate has a plate shape, and the movable side end plate is connected to another member such as another flange, a plate, or the like on the peripheral edge of the movable side end plate. Because the plate flange is formed, when mounting other members such as other flanges, plates, etc. to the vacuum valve, the work can be done by tightening bolts without using welding etc. Therefore, work efficiency is improved.
[0012]
Also, a fixed-side shock absorbing bellows is provided so as to surround the fixed-side energized shaft provided through the fixed-side end plate, and one end is connected to the fixed-side energized shaft and the other end is connected to the fixed-side end plate. By this, the impact force at the time of injection when the movable side electrode is joined to the fixed side electrode is absorbed by the fixed side shock absorbing bellows, and does not directly act on the fixed side end plate from the fixed side energized shaft and the fixed side energized shaft The impact force applied to the connection with the fixed end plate and the connection with other members is reduced, and damage and airtight leakage are prevented.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIG. Reference numerals 11a and 11b denote a pair of upper bulb insulating cylinders and a lower valve insulating cylinder. Numeral 12 denotes a cylindrical arc shield located inside the two valve insulating cylinders 11a and 11b. The part 12 'is airtightly connected to the opposed parts of the two valve insulating cylinders 11a and 11b. Reference numerals 13a and 13b denote a fixed end plate and a movable end plate at both ends of both valve insulating cylinders 11a and 11b. The movable end plate 13b is disk-shaped and has a through hole 14 formed in the center. Numeral 15 denotes a vacuum container comprising both valve insulating cylinders 11a and 11b and both end plates 13a and 13b.
[0014]
16a is a fixed-side energizing shaft provided through the center of the fixed-side end plate 13a, 17a is a fixed-side electrode provided at the inner end of the fixed-side energizing shaft 16a inside the vacuum vessel 15, and 16b is a fixed-side end plate. A movable-side energizing shaft provided through the through hole 14 of 13b, and is moved in the axial direction by an operation mechanism outside the vacuum vessel 15. Reference numeral 17b denotes a movable-side electrode provided at an end of the movable-side energized shaft 16b inside the vacuum vessel 15, and comes into contact with and separates from the fixed-side electrode 17a.
[0015]
Reference numeral 18 denotes a movable-side energizing shaft movement bellows provided so as to surround a part of the movable-side energizing shaft 16b in the vacuum vessel 15, one end of which is airtightly connected to the movable-side energizing shaft 16b, and the other end of which is movable. It is airtightly connected to the end plate 13b.
[0016]
Reference numeral 19 denotes a movable-side end plate flange formed in a flange shape outside the lower valve insulating cylinder 11b of the movable-side end plate 13b, that is, a peripheral portion of the movable-side end plate 13b, and has a plurality of bolt insertion holes. It is penetrated and connected with other members such as other flanges and plates by bolts.
[0017]
Reference numeral 20 denotes a fixed-side shock absorbing bellows, which is provided so as to surround a part of the fixed-side energized shaft 16a, one end of which is airtightly connected to the fixed-side energized shaft 16a, and the other end of which is airtightly connected to the fixed-side end plate 13a. It is connected.
[0018]
In the case of the above-described embodiment, the movable-side end plate 13b has a disk shape, and a movable-side end plate flange portion 19 that is connected to another member such as another flange or a plate body is formed on the periphery of the movable-side end plate 13b. Therefore, when attaching another member such as a flange, a plate, or the like to the vacuum valve A, the attachment can be performed by tightening bolts without using welding or the like. Efficiency is improved.
[0019]
A fixed-side shock absorbing bellows 20 is provided so as to surround the fixed-side energizing shaft 16a provided through the fixed-side end plate 13a, and one end is connected to the fixed-side energizing shaft 16a, and the other end is fixed to the fixed-side end. By connecting to the plate 13a, the impact force at the time of injection when the movable-side electrode 17b is joined to the fixed-side electrode 17a does not directly act on the fixed-side end plate 13a from the fixed-side energized shaft 16a. The impact force applied to the connection with the fixed end plate 13a and the connection with other members is reduced, and damage and airtight leakage are prevented.
[0020]
Next, FIG. 2 shows a gas-insulated switchgear B in which the vacuum valve A of the embodiment shown in FIG. 1 is housed. Reference numeral 21 denotes a pressure vessel of the gas-insulated switchgear B filled with a high-pressure insulating gas; Is an insulating support member, the base of which is fixed to the wall surface inside the pressure vessel 21, and the fixed end plate 13a of the vacuum valve A is supported by the tip Aa. Reference numeral 23a denotes a fixed-side terminal plate derived from the distal end portion Aa, and is electrically connected to the fixed-side conducting shaft 16a within the distal end portion Aa.
[0021]
Reference numeral 23b denotes a movable terminal plate joined to the lower surface of the movable end plate 13b. Reference numeral 24 denotes a current collector having a base fixed to the movable terminal plate 23b. The plate 23b is electrically connected to the movable-side conducting shaft 16b via the current collector 24.
[0022]
Reference numeral 25 denotes a movable insulating cylinder surrounding the movable energizing shaft 16b, and reference numeral 26 denotes a movable shock absorbing bellows, the lower end of which is air-tightly connected to the upper end of the movable insulating cylinder 25. An upper flange 27a is connected to an upper end of the movable shock absorbing bellows 26, and the upper flange 27a is airtightly bolted to the movable end plate flange 19 with the movable terminal plate 23b interposed therebetween.
[0023]
27b is a lower flange connected to the lower end of the movable insulating cylinder 25, 28 is a partition wall provided in the pressure vessel 21, and the lower flange 27b is airtightly fastened to the opening periphery of the partition wall 28, The inside of 21 is composed of a partition wall 28, a movable side insulating cylinder 25, a movable side shock absorbing bellows 26, a movable side end plate 13b, a movable side energized shaft movement bellows 18, and the like. The high pressure chamber 29 is filled with about 0.5 MPa of nitrogen gas, and the low pressure chamber 30 is filled with about 0.1 MPa of nitrogen gas. Note that the low pressure chamber 30 may be open to the atmosphere.
[0024]
Reference numeral 31 denotes an insulated operation rod connected to the lower end of the movable-side energized shaft 16b. The rotation of the operation shaft 32 causes the movable-side energized shaft 16b to move up and down via the operation lever 33 and the insulated operation rod 31, and the movable-side electrode 17b Comes into contact with and separates from the fixed-side electrode 17a.
[0025]
In the case of the embodiment of FIG. 2, both the valve insulating cylinders 11a and 11b of the vacuum valve A are located in the high pressure chamber 29, and are covered with a high-pressure insulating gas to improve the dielectric strength. The insulation distance from the container 21 can be shortened.
[0026]
In addition, the inner surface of the movable-side energizing shaft motion bellows 18 communicates with the low-pressure chamber 30, and the pressure difference between the inside and outside of the bellows 18 is suppressed to a small value, so that stress applied to the bellows 18 is reduced and reliability is improved. I do.
[0027]
Further, since the flange portion 19 is formed on the peripheral edge of the movable side end plate 13b, it is easy to attach other members such as the movable side terminal plate 23b and the upper flange 27a.
[0028]
In addition, since the movable-side shock absorbing bellows 26 is provided, the impact force of the movable-side electrode 17b on the fixed-side electrode 17a is increased by both the fixed-side shock absorbing bellows 20 and the movable-side shock absorbing bellows 26. Is absorbed even more. When the movable side shock absorbing bellows 26 is provided, the fixed side shock absorbing bellows 20 does not necessarily need to be provided. When the fixed-side shock absorbing bellows 20 is provided, the movable-side shock absorbing bellows 26 does not necessarily need to be provided.
[0029]
Note that the movable side end plate 13b is not necessarily limited to a disk shape, but may be a plate shape having a movable side end plate flange portion 19 formed at a peripheral portion.
[0030]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
In the vacuum valve of the present invention, the movable-side end plate 13b through which the movable-side energized shaft 16b penetrates is plate-shaped, and is connected to another member such as another flange, a plate body, or the like at the periphery of the movable-side end plate 13b. Since the movable side end plate flange 19 is formed, when other members such as a flange and a plate body are attached to the vacuum valve A, the attachment can be performed by fastening bolts without using welding or the like. The mounting work is easy, and the working efficiency can be improved.
[0031]
A fixed-side shock absorbing bellows 20 is provided so as to surround the fixed-side energizing shaft 16a provided through the fixed-side end plate 13a, and one end is connected to the fixed-side energizing shaft 16a, and the other end is fixed to the fixed-side end. By connecting to the plate 13a, the impact force at the time of injection when the movable side electrode 17b is joined to the fixed side electrode 17a is absorbed by the fixed side shock absorbing bellows 20, and from the fixed side conducting shaft 16a to the fixed side end plate 13a. Without direct action, it is possible to reduce the impact force applied to the connecting portion between the fixed-side energizing shaft 16a and the fixed-side end plate 13a and the connecting portion of other members, thereby preventing damage and airtight leakage.
[Brief description of the drawings]
FIG. 1 is a cut-away front view of one embodiment of the present invention.
FIG. 2 is a cut-away front view of a gas-insulated switchgear provided with the vacuum valve of FIG. 1;
FIG. 3 is a cut front view of a conventional vacuum valve.
[Explanation of symbols]
11a Upper valve insulating cylinder 11b Lower valve insulating cylinder 13a Fixed-side end plate 13b Movable end plate 15 Vacuum container 16a Fixed-side energized shaft 16b Movable-side energized shaft 17a Fixed-side electrode 17b Movable-side electrode 18 Bellows for movable-side energized shaft movement 19 Movable end plate flange 20 Fixed side shock absorbing bellows

Claims (2)

A vacuum container composed of a valve insulating cylinder, a fixed end plate and a plate-shaped movable end plate in which both ends of the valve insulating tube are vacuum-sealed,
A fixed-side energizing shaft provided through the fixed-side end plate,
A fixed-side electrode provided at an end of the fixed-side energized shaft inside the vacuum vessel;
A movable current-carrying shaft that is provided through the movable-side end plate and moves in the axial direction by an operation mechanism outside the vacuum vessel;
A movable-side energizing shaft that is provided at an end of the movable-side energizing shaft inside the vacuum vessel and that comes into contact with and separates from the fixed-side electrode;
A movable-side energizing shaft movement bellows provided to surround the movable-side energizing shaft, one end of which is hermetically connected to the movable-side energizing shaft, and the other end of which is hermetically connected to the movable-side end plate;
A vacuum valve, comprising: a movable-side end plate flange portion formed on a peripheral portion of the movable-side end plate and connected to another member such as another flange or a plate body. A fixed-side impact absorbing shaft provided so as to surround a fixed-side energizing shaft provided through the fixed-side end plate, one end of which is connected to the fixed-side energizing shaft and the other end of which is connected to the fixed-side end plate. The vacuum valve according to claim 1, further comprising a bellows.

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