JP2596280Y2 - Airtight structure of shaft opening of gas switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas switch used in a high-voltage distribution line, and more particularly to an improvement in a hermetic structure of a shaft penetration portion by a double O-ring for a case.

[0002]

2. Description of the Related Art In a gas switch of this kind, various shafts such as a handle shaft and a pointer shaft penetrating the case in an airtight state are also provided with a gas seal structure.

Conventionally, a plurality of (double) O-rings are interposed on an operation shaft, a rotation shaft, or the like penetrating the case to maintain airtightness with the case.
In such a case, O located outside the case exposed to the outside air
The ring and the O-ring located inside the case filled with SF ₆ gas 3 are usually made of the same material.

[0004]

In the case where the double O-rings are formed of the same material as in the prior art,
Gas permeation increases, gas leaks due to failure to maintain the required elasticity with temperature changes, is exposed to the external environment, insulation deteriorates, and is damaged by mechanical wear. However, sufficient long-term reliability has not yet been obtained.

[0005]

This invention SUMMARY OF THE INVENTION intended to solve the above problems, as well as gas-tight seal by filling a deion gas such as SF ₆ gas into the cases, the shaft such as an operation mechanism in shall comprise through the <br/> cases the walls in the inner and outer direction,
A support pipe is penetrated into the case and fixedly attached.
Penetrates the shaft into the loop, and the shaft has three narrow annular walls.
Are arranged side by side at a predetermined interval, and a first annular wall at the center thereof is provided.
Between this and the second annular wall located inward of the case
Is a fluorine rubber with gas permeability, abrasion resistance and heat resistance
The O-ring consisting of
An annular wall and a third ring located outwardly of the case from the annular wall
The Jo walls weather resistance, tracking resistance, water resistance, made of EPM rubber or EPDM rubber having an ozone resistance
The O-ring is fitted in an airtight state, and
In the case inner direction, it is located between the shaft and the support pipe.
A collar is fitted, and the third annular wall extends outward from the case.
The present invention proposes an airtight structure of a shaft penetrating portion of a gas switch, wherein a second collar is fitted between a shaft and a support pipe .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a gas switch formed of a butt contact (electrode), and does not have a special isolating device for extending and extinguishing an arc generated between the electrodes due to rapid cutting.

Reference numeral 2 denotes an airtight structure case made of stainless steel or the like, in which SF ₆ gas 3 contains 1.2 kg / cm ^2.
It is filled to a predetermined pressure of ~1.6 kg / cm ^2. Reference numeral 4 denotes a load-side bushing penetrating the side wall 2a of the case, which is attached to the case 2 in a state of being kept airtight.

[0008] 5 is a porcelain insulator, 6 is a flange 5a of the insulator 5
For fixing the tube 5 by pressing and fixing the same to the outer surface 2b of the case via the holding metal 7, a nut 8 and a packing 9 interposed between the flange 5a and the outer surface 2b of the case 2.
0 is an O-ring interposed between the storage portion 2c and the flange 5a of the outer surface 2b of the case, 11 is a guard fitting for protecting a bushing, and 12 is a ground fault current detection fitting fitted on the outer periphery of a porcelain tube located in the case. The current transformer is fixed to the inner surface side of the case by a support bracket 13 with bolts 14 and nuts 15. The current transformer 12 is for giving a trip command to a later-described operating mechanism in a locked state when a ground fault current is detected. Reference numeral 16 denotes an insulating tube made of rubber or the like attached to the contact portion 13a of the support fitting 13.

Reference numeral 17 denotes a center conductor inserted through the through hole 5b of the insulator tube 5, and 18 denotes an O which is housed in a housing groove 17b provided in a flange 17a of the center conductor and which is in close contact with the outer step portion 5c of the insulator tube. The ring 19 is a substantially oval detent fitting fitted to the center conductor 17. The fitting 19 is non-rotatably fitted to the center conductor 17, and further has a recess at the inner step of the insulator tube 5. At 5h, the convex portion 19a is immersed so as not to rotate.

Reference numeral 20 denotes packing, 21 denotes a spring washer, 22 denotes a tightening nut, and 23 denotes an insulating sealing material made of silicone resin or the like. 24 is the center conductor 1
The core wire 2 is connected to a bag-shaped connecting portion 17d provided at the outer end of
4a is a lead wire formed by crimping connection, and 25 is a lead wire 24.
An insulating tube covering the core wire 24a and the outer peripheral surface of the connecting portion 17d, 26 is a buffer rubber for preventing freezing cracks interposed at the innermost portion of the connecting portion 17d, and 27 is a sealing material such as silicone resin.

Reference numeral 28 denotes a flexible connection conductive plate.
One end 28a is screwed to the internal measuring portion 17g of the center conductor 17, and the other end 28b is screwed to the movable insulator 30. The plate 28 is made by laminating a number of thin copper plates, both ends of which are soldered, and further provided with mounting holes 28c.

Reference numeral 33 denotes a rubber tube for covering the outer peripheral surface of the connection conductive plate. 30 is its upper surface 30a and its lower surface 3
Ob is a movable insulator having a substantially rectangular outer shape made of an epoxy resin or the like obtained by inserting a cap nut into the operating mechanism 60b.
The screw 32 is also integrated with the drive frame 46 which is connected to the
When the operation handle 62 is operated at the time of opening and closing, the rotation support shaft 35 of the drive plate 34 is rotated via the operation mechanism 60, and accordingly, the movable insulator 30 and the movable electrode 50 integrated with the insulator are coaxially connected. It rotates clockwise or counterclockwise around.

Reference numeral 36 denotes an upper surface (inner surface) 28 of the connection conductive plate 28.
This is an intermediate electrode plate in which one end 36a is screwed to the movable insulator 30 together with the connection conductive plate 28 while being overlapped on the g side, and the other end 36b of the intermediate electrode plate 36 is overlapped on the upper surface 36c side. One end 37 a of the movable electrode plate 37 is connected and connected by a guide pin 38. Reference numeral 40 denotes a guide bracket having a U-shaped cross section, and an upper surface 37c of the movable electrode plate 37.
From the side, the upper surface 37c and both side surfaces 37m of the plate 37 are connected to the both side surfaces 36m of the intermediate electrode plate 36 by the pins 38 so as to sandwich the same.

The guide pin 38 penetrates through a connection hole 36n of the intermediate electrode plate 36, a connection hole 37n of the movable electrode plate 37, and a connection hole 40n of the guide fitting 40, and is mounted on the shaft. Further, a coil spring 43 interposed between the lower surface 36d of the intermediate electrode plate 36 and the stoppers 41 and 42 fixed to the lower end of the pin 38 is wound around the pin 38 in a compressed state. Due to the spring force of the coil spring 43, the coil spring 43 elastically adheres with an appropriate contact pressure.

Reference numeral 47 denotes a retaining pin for the guide pin 38, 37s.
Is a main contact portion on the tip side of the movable electrode plate 37, 37p is an auxiliary contact portion made of arc-resistant metal brazed to the tip adjacent to the contact portion 37s, and 48 is a screw 4 integrated with the movable electrode plate 37.
Nine pieces of the adsorption pieces have a U-shaped cross section and are made of a magnetic material such as an iron piece. The suction piece 48 is screwed 49 so as to wrap the main contact portion 37s and the auxiliary contact portion 37p of the movable electrode plate 37 from the lower surface 37d side, and the suction tip 48a located on the side surface of the same piece. Is slightly protruded upward from the upper surface of the auxiliary contact portion 37p. The movable electrode 50 includes an intermediate electrode plate 36, a movable electrode plate 37, a main contact portion 37s, and a suction piece 48.
And so on.

Reference numeral 51 denotes a power supply-side bushing which is airtightly provided on the side wall 2d on the opposite side of the case so as to face the load-side bushing 4 and has a structure similar to that of the load-side bushing 4. Reference numeral 52 denotes a porcelain tube, and a central conductor 53 is provided on the inner end side of the case in a protruding state, and a fixed electrode 54 is fixedly provided at the distal end.

Reference numeral 55 denotes a nut screwed and fixed to the center conductor 53, reference numeral 56 denotes an anti-rotation fitting which is positioned outside the nut 55 and has a hole 56a inserted in the center conductor 53 so as not to rotate. A reinforcing member 58 non-rotatably fitted to the missing portion 56b of the metal fitting 56, and cannot be rotated from above the reinforcing metal member 57 in the same manner as the reinforcing metal member 57 on the missing portion 56b of the rotation preventing metal member 56. Fixed electrode plates which are fitted in the spring washers 5
9 and tightened by a screw 60 to form a central conductor 53
And a nut 55.

The reinforcing metal member 57 has a mechanical strength and is formed by bending an iron piece, which is also a magnetic material, into a substantially F-shape by pressing or the like.
The fixed electrode plate 58 made of a copper plate is superposed and arranged on the upper surface 58a side to mechanically reinforce the plate and at the same time
The suction portions 57b on both sides bent so as to sandwich both sides of the movable electrode are projected downward, and face the tip end 48a of the suction piece 48 on the movable electrode side. That is, the reinforcing metal member 57 mechanically reinforces the fixed electrode metal member 58 and also serves as a suction piece.

In addition, the above-mentioned fixed electrode plate 58 is
7, the main contact portion 37s of the movable electrode 50 is provided on the plate 58.
An arc-shaped main contact portion 58s is formed to protrude downward in opposition to the main contact portion. An auxiliary contact portion 58p made of arc-resistant metal is brazed to a recess 58g formed at the rear of the main contact portion 58s. The fixed electrode 54 includes a fixed electrode plate 58, a rotation preventing bracket 56, and the like, in addition to the central conductor 53. The one in which the movable electrode and the fixed electrode come into abutting contact as described above is generally called a butt contact (electrode).

In the above, the suction portion 57b of the reinforcing metal fitting provided on the fixed electrode plate 54 and the suction piece 4 provided on the movable electrode side.
8 is a main contact portion 37 which requires the most suction force (contact pressure).
s and the main contact portion 58s.

Next, the operation mechanism 60 will be described. 61
As shown in FIG. 20, an operation shaft 62 penetrates the case 2 through two O-rings 80 and 81 in an airtight manner.
Is an operation handle attached to a portion of the operation shaft 61 located outside the case by attaching a screw 62a, 63 is an operation plate fixed to a portion of the operation shaft 61 located inside the case, and 64 is an operation plate having an attachment hole 64a at one end. 63 is connected to the pin 65 in the mounting hole 63a, and the mounting hole 64b at the other end is connected to the mounting hole 3 of the driving plate 34.
A connecting plate 34 connected to the 4c by a pin 66 is a driving plate to which a rotation support shaft 35 is fixed at the center and mounting holes 34c and 34d are provided at both ends around the coaxial 35, as described above. And a mounting hole 34d at the other end is connected to a spring guide plate 67 by a pin 68.

Reference numeral 69 denotes a power storing spring for quick cutting, 70 denotes a support shaft fixed to the inner surface of the case for supporting the power storing spring 69 and the spring guide plate 67 by welding or the like, and 71 denotes welding or the like to the inner surface of the case. The stopper is fixed by
When the switch is opened, the side end 34g of the drive plate 34 collides with the switch to restrict excessive opening.

In the above, the drive frame 46 to which the movable insulator 30 is screwed and the rotary support shafts 3 of the drive plates 34 and 72 assembled integrally with the frame 46 are provided.
Reference numerals 5 and 73 are rotatably supported on support fittings 76 and 77 respectively screwed and fixed to the inner surfaces of the case on the operation handle 62 side and the pointer 74 side.

Reference numeral 74 denotes a pointer provided on the outer surface of the case opposite to the operation handle to indicate the open / closed state. And the screw 79 is integrally attached.

The case 2 of the operating shaft 61 and the rotating shaft 78
The airtight structure for is as follows. First, the operation shaft 61 will be described with reference to FIG.

Reference numeral 85 denotes a support pipe which penetrates and is fixed to the case 2, and through which the operation shaft 61 is rotatably penetrated. Outer peripheral surface 6 located substantially at the center of operation shaft 61
Three annular walls 61b are continuously formed in 1a, and an O-ring 80 of fluoro rubber is fitted in two concave portions 61c-61d formed between these annular walls, located inside the case. EPM or EPDM located outside
An O-ring 81 made of (ethylene propylene rubber) is fitted, and the airtightness of the shaft portion is held by a double O-ring. Reference numeral 86 denotes a metal collar fitted to the outer peripheral surface 61a of the operation shaft located on both sides of the group of annular walls 61b, and regulates the inclination of the operation shaft 61 with respect to the support pipe 85. 8
Reference numerals 7 and 88 denote disc-shaped closing plates interposed between the operation plate 63 and the end surface of the support pipe 85, between the operation handle 62 and the end surface of the support pipe 85, and between the operation handle 62 and the end surface of the support pipe 85.

Next, the airtight structure on the rotating shaft side for the pointer will be described with reference to FIG. Reference numeral 89 denotes a support pipe which penetrates and is fixed to the case 2. The pipe 89 has a rotary shaft 7 for a pointer.
8 is rotatably penetrated. Reference numeral 78b denotes an annular annular wall, which is a case 2 filled with SF ₆ gas 3 as described above.
The O-ring 82 made of fluoro rubber is fitted inside the case and the O-ring of the EPM or EPDM is placed outside the case.
A ring 83 is fitted, and the rotation shaft 78 of the pointer is also 2 dia. Like the operation shaft 61 of the operation handle.
Airtightness is maintained by heavy O-rings. 90 indicates a metal collar, and 91 indicates a closing plate.

In the above description, an O-ring 82 made of fluoro rubber is located on the operation shaft 61 and the rotation shaft 78 on the inside of the case as described above.
M or EPDM O-ring 83 is used,
This is because the former fluoro rubber O-ring 82 is excellent in gas permeation resistance, abrasion resistance, and high temperature resistance, and the latter EPM or EPDMO ring 83 has ozone resistance,
By making use of the advantages of both materials such as excellent weather resistance and low temperature resistance, the airtight reliability of the shaft portions of the operating shaft 61 and the rotating shaft 78 is further enhanced.

Next, the operation from the closing to the opening of the switch having the above configuration is as follows. 4 and 5 show the closed and opened states of the switch, and FIG. 4 shows the closed state. FIG. 4 shows the lead-out line 24 on the load side, the center conductor 17, the connecting conductive plate 28, the intermediate electrode plate 36, and the movable electrode plate. Power is supplied through the path of 37-main contact portion 37s-main contact portion 58s-fixed electrode plate 58-center conductor 53-lead wire 84 on the power supply side.

When the operating handle 62 is opened in such a closed state, the operating mechanism 60 connected to the operating handle 62 is opened.
The movable insulator 30 and the movable electrode 50 rotate clockwise about the rotation support shafts 35 and 73 via the, so that the movable electrode 50 that has been in a contact state so far is separated from the fixed electrode 54 and the electric path is opened. .

That is, in the closed state shown in FIG. 4, the main contact portion 37s of the movable electrode 50 and the main contact portion 5
Only for 8 s is in contact. Then, when the movable electrode is rotated by the opening operation, the main contact portions 37s and 58s continue to be in contact with each other while sliding, and further, the auxiliary contact portions 37p and 58p
A contact state is also established. Then, when further rotated, the main contact portions 37s and 58s are separated from each other, and the auxiliary contact portions 37p and
The contact state is maintained for 8p while sliding. When the rotation further proceeds, the auxiliary contact portions 37p and 58p are finally separated from each other, and an arc is generated between the auxiliary contact portions 37p and 58p. Since the generated arc is rapidly separated between the contact portions 37p and 58p by the operation mechanism 60 of the quick-cut system, the arc is simultaneously stretched in SF ₆ gas and disappears, and the arc is isolated as shown in FIG. Is released.

It goes without saying that the operation of inputting is the reverse of the above. The above description is for the opening / closing operation by manual operation of the operation handle. However, if an accident occurs and a ground fault current flows when the switch is turned on, this current is converted. The lock is released (trip) by issuing a command to the operating mechanism,
The switch is opened immediately by the storage spring 69.

[0033]

In the double O-ring structure of the operation shaft or rotating shaft the present invention as described above, according to the present invention penetrates the casing filled with SF ₆ gas, a case inside which may touch or come into direct contact with SF ₆ gas O Fluororubber with gas permeability, abrasion resistance and heat resistance is used for the ring, and weather resistance, water resistance, tracking, insulation and heat resistance are located on the outside of the case and on the side affected by the external environment. The use of the EPM rubber or EPDM rubber having the property can further improve the airtight reliability by the double O-ring in the shaft penetration portion. In addition, the shaft contacting the support pipe
Since the part is only an annular wall, contact between the shaft and the support pipe
The area is reduced and almost the entire length of the shaft contacts the support pipe
The contact friction resistance is lower than that of
Works and pointers can be operated with a small force. Also,
If the contact area is reduced in this way, the shaft will rattle.
However, as in the present invention, the annular wall is sandwiched.
Since collars are provided on both sides in the axial direction, the rattling of the shaft can be reduced.
Can be prevented.

[Brief description of the drawings]

FIG. 1 is a partially cut-away longitudinal sectional view of a gas switch of the present invention as viewed from the front side.

FIG. 2 is a longitudinal sectional view of a load side bushing part.

FIG. 3 is a schematic longitudinal sectional view of the gas switch as viewed from a side.

FIG. 4 is an electrode portion of the gas switch in a closed state.

FIG. 5 is a partial view of an electrode in an open state of the gas switch.

FIG. 6 is a perspective view of a main part of the operation mechanism.

FIG. 7 is a front view of a state where a movable electrode is assembled to a movable insulator.

FIG. 8 is a side view of FIG. 7;

9 shows a part of the bottom view of FIG. 7;

FIG. 10 is a perspective view showing a part of the movable electrode side.

FIG. 11 is a sectional view showing an assembled state of a guide fitting and a guide pin.

FIG. 12 is a front view showing an assembled state on the fixed electrode side.

FIG. 13 is a perspective view showing an assembled state of a fixed electrode plate and a reinforcing bracket.

FIG. 14 is a longitudinal sectional view of a fixed electrode plate.

FIG. 15 is a bottom view of FIG.

FIG. 16 is a front view of a reinforcing fitting.

FIG. 17 is a side view of FIG. 16;

FIG. 18 is a front view of a rotation preventing bracket.

FIG. 19 is a bottom view of FIG. 18;

FIG. 20 is a longitudinal sectional view near the operation axis.

FIG. 21 is a vertical cross-sectional view near the rotation axis of the pointer.

[Explanation of symbols]

2 Case 3 SF ₆ gas 61 Operation shaft 74 Pointer 78 Rotation shaft 80, 82 Inner O-ring 81, 83 Outer O-ring

Continuation of front page (56) References JP-A-5-190060 (JP, A) JP-A-4-293950 (JP, A) JP-A-6-116449 (JP, A) JP-A-4-292824 (JP) , A) JP-A-62-295313 (JP, A) JP-A-58-188602 (JP, A) JP-B-6-25235 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB (Name) H01H 33/28-33/59

Claims (1)

(57) [Scope of request for utility model registration] 1. A filled with extinguishing gas such as SF ₆ gas as well as gas-tight seal in the cases, cable axis such as an operation mechanism
In shall comprise through scan the wall of the inside and outside direction, the
A support pipe is inserted into the case and fixed.
Through the shaft, and the shaft is provided with three narrow annular walls.
They are arranged side by side at a fixed interval, and
The second gas permeability resistance in the annular walls located Reyori case inward, abrasion resistance, fluorine rubber having heat resistance
O-ring fitted in an airtight manner, and a first annular
Wall and a third annular wall outwardly of the case
Between weather resistance, tracking resistance, water resistance, O Li consisting of EPM rubber or EPDM rubber having an ozone resistance
The casing is fitted in an airtight state, and the casing of the second annular wall is further fitted.
In the inward direction, the first collar is located between the shaft and the support pipe.
The third annular wall has a shaft
An airtight structure for a shaft opening of a gas switch, wherein a second collar is fitted between the shaft and the support pipe .