JPH0215220Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention relates to the electrode structure of a gas switch.

Conventional technology Conventionally, the electrode structure of gas switches was
- As shown in Publication No. 133767, in a device where the contact of the fixed electrode and the contact of the movable electrode conductor are in phase contact, a magnetic material is attached to each contact so as to be adjacent to the conductor and face each other. It is known that the electromagnetic repulsion force generated between both contacts is suppressed by the electromagnetic attraction force generated between both conductors and both magnetic bodies.

However, in the conventional electrode structure described above, insulating fine powder is generated due to the arc generated between the fixed electrode and the movable electrode during the closing/unclosing operation, and this adheres to the contact area of both electrodes and interferes with current flow. Something happened.

Purpose The purpose of this invention is to solve the above-mentioned problems and to create an electrode for a gas switch that prevents failures due to the adhesion of insulating fine powder due to arc generation by having the movable electrode in sliding contact with the fixed electrode during closing and opening. It's about providing structure.

Embodiment An embodiment embodying this invention will be described below with reference to FIGS. 1 to 16.

Reference numeral 1 denotes the main body case of the gas switch which is airtight and is filled with arc-extinguishing gas such as SF _6. Reinforcement plates 2 are fixed to the inner walls on both the left and right sides, and power supply side bushings 3 are installed for each phase. and load side bushing 4
1 is inserted and fixed. This both bushing 3,
41 has the same internal structure and the same way of fixing to the case 1, so the power supply side bushing 3 will be explained.

As shown in FIG. 2, this power supply side bushing 3 is inserted from the outside into an insertion hole 4 formed through the side wall, and can be locked to the case 1 with a flange 5 protruding from the outer periphery of the central portion. A garter spring 7 is wound around a locking groove 6 recessed in the inner outer periphery. A pressing plate 8 is inserted into the inner part of the case of the bushing 3 through a central insertion hole 8a, and a locking portion 8b protruding toward the main case 1 side is provided around the entire periphery of the insertion hole 8a, and the garter The outer periphery of the spring 7 on the main body case 1 side can be locked. Furthermore, screw holes 9 are threaded at appropriate locations around the insertion hole 8a of the pressing plate 8, and the tips of the screws 10 screwed into the screw holes 9 are connected to the locking recesses 2a provided in the reinforcing plate 2. is in contact with. The bushing 3 is fixed to the main case 1 via the garter spring 7 by screwing each screw 10 into the pressing plate 8 and pressing the pressing plate 8 inward to the main case 1.

Reference numeral 11 denotes a positioning ring for a bushing fitted into the insertion hole 4 of the main body case 1 from the outside,
It is interposed between the flange 5 of the bushing 3 and the case 1. Reference numeral 12 denotes a metal annular spacer interposed between the flange 5 of the bushing 3 and the case 1, and has a larger diameter than the positioning ring 11. The compression rate of the arranged O-ring 13 is regulated. The O-ring 13 ensures airtightness between the bushing 3 and the main body case 1.

Reference numeral 14 denotes an inner bore that is transparent along the axis of the bushing 3, and a locking step 15 is formed in the center thereof, and an inner end of the bushing 3 adjacent to the locking step 15 is formed in the center thereof. A rotation preventing portion 17 having a pair of opposing fitting grooves 16 recessed along the axial direction is formed on the inner periphery of the portion side.

Reference numeral 32 in FIG. 5 denotes locking recesses provided at an appropriate number of locations (four locations in this embodiment) on the outer periphery of the inner end of the bushing 3. Reference numeral 33 denotes an annular cap having a locking protrusion 34 on the inner periphery of the proximal end as shown in FIG. An annular locking protrusion 35 is formed on the inner periphery of the adjacent central portion of the portion 34, and is fitted to the inner end surface of the bushing 3 so as to be engaged with the inner end surface of the bushing 3, and rotates relative to the bushing 3. He is unable to move.

Reference numeral 18 denotes a conductor rod inserted into the inner cavity 14 from the outer end side of the bushing 3, and a flange 19 protruding from the center thereof to be locked to the locking step 15 is formed to prevent rotation. On the outer periphery corresponding to the portion 17, a rotation preventing protrusion 20 that is fitted into the fitting groove 16 is formed to protrude along the length direction, thereby making it impossible to rotate relative to the bushing 3. Reference numeral 21 denotes a threaded portion formed on the outer periphery of the base end of the conductor rod 18. 2
Reference numeral 2 denotes a fixed electrode inserted into the inner cavity 14 from the inner end of the bushing 3, the base end of which is connected to the conductor rod 18.
It is screwed into the threaded portion 21 of. A flange 23 protruding from the outer periphery of the tip of the fixed electrode 22 with a diameter smaller than the inner diameter of the locking protrusion 35 of the cap 33 and a flange 19 of the conductor rod 18 engage with the inner end surface of the bushing 3, respectively. Both 1 are tightened by tightening the conductor bar 18 until it is latched to the stop portion 15.
8 and 22 are fixed to the bushing 3.

Note that a cylindrical buffer member 24 made of a soft synthetic resin material is provided on the outer periphery of the detent portion 17 of the conductor rod 18.
A packing 25, a washer 26, and a spring washer 27 made of asbestos are interposed between the flange 19 and the locking step 15.

Reference numeral 28 is a lead wire crimped into the tip of the conductor rod 18 and led out from the outer end of the bushing 3. Reference numeral 29 denotes an insulating and elastic filling member that is filled in the inner cavity 14 of the bushing 3 from the locking step portion 15 to the outer end side.

Reference numeral 30 denotes a locking protrusion protruding annularly from the outer periphery of the distal end side of the flange 23 of the fixed electrode 22,
It is locked to the locking protrusion 35 of the cap 33, and its outer periphery is fitted into the inner periphery of the cap 33. 31
is an O-ring disposed between the locking protrusion 30 and the inner end surface of the bushing 3; its outer circumference is connected to the locking protrusion 35 of the cap 33, and its inner circumference and compression rate are connected to the flange of the fixed electrode 22. 23 to ensure airtightness when the fixed electrode 22 is fixed to the bushing 3.

As shown in FIGS. 2 and 4, reference numeral 36 denotes a suitable number (four in this embodiment) of anti-rotation recesses formed at intervals on the periphery of the locking protrusion 30 of the fixed electrode 22. After the fixed electrode 22 is fixed to the bushing 3, a part of the inner periphery of the corresponding cap 33 is heated and the detent protrusion 37 eluted into the detent recess 36 engages with the cap 33 and the fixed electrode 22. This makes it impossible to rotate relative to the

Reference numeral 38 denotes a contact portion having a spherical surface such that its central portion protrudes from the tip surface of the fixed electrode 22;
As shown in the figure, an arc-proof metal 39 having a smaller protrusion than the central portion of the contact portion 38 is soldered to the adjacent upper portion.

Next, a description will be given of the movable electrode section which is operated to open and close with respect to the fixed electrode 22 of the power supply side bushing 3.

As shown in FIG. 1, 45 is a square prism-shaped rotation shaft installed in the front-rear direction below the main body case 1 so as to be interposed between the bushings 3 and 41 of each phase, and as shown in FIG. 6. Both ends 45
a and 45b are formed in a cylindrical shape and are rotatably supported by a pair of bearings 46 fixed to the lower part of the main body case 1. Note that 47 is the bearing hole 46 of the bearing 46.
The bearing sleeve 48 fitted in a is a retaining pin attached to both ends of the rotation shaft 45 at 45a and 45b, respectively.

49 is an arm attached to the right side of the rotating shaft 45 corresponding to the bushings 3 and 41 of each phase as shown in FIGS. A bolt 5 is inserted from the right side of the base end and is fitted onto the rotating shaft 45 at a mounting portion 50 recessed in a U-shape on the left side of the base end so as to be close to the bottom.
1 is fixed to the right side of the rotating shaft 45 via a plurality of contact pressure adjustment plates 52. 53 is arm 4
A rectangular insertion hole 54 is formed through the upper wall 49a of the insertion hole 53.

Reference numeral 55 denotes a fixed plate made of a ferromagnetic material such as iron that is screwed 56 to the lower surface of the upper wall 49a, and its left edge is slightly protruded from the left edge of the upper wall 49a.
A through hole 55a having a smaller diameter than the insertion hole 54 is formed approximately at the center corresponding to the insertion hole 54. 57 is the insertion hole 54 of the arm 49 and the fixing plate 5
A split pin 58 is a support rod that is loosely inserted into the through hole 55a of No.
The upper surface of the washer 59 is locked, and both ends of a compression spring 60 as a biasing member wound around the support rod 57 are in contact with the washer 59 and the upper surface of the fixed plate 55, respectively. The base end of the movable electrode section 61 is loosely inserted into the lower end of the support rod 57, and the movable electrode section 61 is locked by a pin 62 inserted and fixed into the lower end of the support rod 57, and the movable electrode section 61 is always supported by the compression spring 60. A base end portion of the portion 61 is biased toward the fixed plate 55 side.

Note that the movable electrode section 61 is configured as follows.

Reference numeral 65 denotes a movable contact made of an elastic silver-plated copper plate, and at its base end there is a braided wire 67 with one end attached to the tip of the fixed electrode 22 of the load-side bushing 41 with a screw 66. The other end is secured with a rivet 68, and a through hole 69 for loosely inserting the support rod 57 is formed in the center.

As shown in FIGS. 11 and 12, 72 is a channel-shaped adsorption member made of a ferromagnetic material that is rivet 73 attached to the lower surface of the base end of the movable contact 65, and has a through hole in the movable contact 65. A through hole 74 for loosely inserting the support rod 57 is formed corresponding to the hole 69, and the pin 62 of the support rod 57 is locked at the lower surface of the hole 74. Then, the end surfaces 72a of both sides are connected to the fixing plate 55 so that a magnetic circuit can be formed with the fixing plate 55.
When a current flows through the movable contact 65, the magnetic resistance is reduced (in the direction of the arrow in FIG. 12), that is, the attracting member 72 is attracted to the fixed plate 55. It's getting old.

75 is located at the center of the movable contact 65 upwardly.
This is a locking portion bent at an angle of less than 90 degrees, and is locked to the left side edge of the fixed plate 55 so that the movable contact 65 can rotate at the locking portion 75 .

76 connects the movable contact 65 via the locking portion 75.
The contact portion is bent upward in a stepwise manner at the tip thereof, and is capable of slidingly contacting the upper portion of the contact portion 38 of the power supply side bushing 3 during the closing/opening operation of the arm 49. Further, when the arm is open, it is designed to have a sufficient insulation distance from the contact portion 38.

Reference numeral 77 is an arc-proof metal soldered to the upper part of the contact portion 76, and is adapted to slide into contact with the arc-proof metal 39 of the power supply side bushing 3 during the closing/opening operation of the arm 49. The arc-resistant metal 77 contacts the arc-resistant metal 39 before the contact parts 38, 76 contact when it is closed, and the contact parts 38, 76 contact the arc-resistant metal 39 when released.
is adapted to come into contact with the arc-proof metal 39 immediately before separating. Reference numeral 78 is a stirring plate made of heat-resistant synthetic resin, which is riveted 79 on the right side of the contact portion 76, and both sides and the upper portion thereof are connected to the contact portion 76.
stands out from

The movable contactor 65 and the adsorption member 72 constitute the movable electrode section 61.

When this movable electrode part 61 is in an open state as shown in FIG.
Due to the biasing force of the compression spring 60 through the fixing plate 5
It is in contact with 5. When the arm 49 is rotated counterclockwise by the rotation shaft 45 during the closing operation, the arc-proof metal 77 of the movable contact 65 first touches the power supply side bushing 3 at its upper part as shown by the chain line in FIG. It comes into contact with the arc-resistant metal 39. When the movable contact 65 is further rotated counterclockwise, the base end of the movable contact 65 resists the biasing force of the compression spring 60 with the abutment point as the point of force and the locking portion 75 as the fulcrum (center). while rotating clockwise. Due to the clockwise rotation of the movable contact 65 and the counterclockwise rotation of the arm 49, the arc-proof metal 77 of the movable contact 65 comes into sliding contact with the arc-proof metal 39 of the bushing 3, and finally the contact portion 76 comes into contact with the upper part of the contact portion 38 of the bushing 3, thereby causing both 77 and 39
are separated. After that, the contact portion 76 is connected to the bushing 3.
The contact portion 76 slides downward along the curved surface of the arm 49, and when the predetermined closing operation of the arm 49 is completed, the contact portion 76
is brought into contact with the center of the contact portion 38 of the power supply side bushing 3. At this time, the contact portion 76 always maintains a constant contact pressure against the contact portion 38 of the bushing 3 due to the biasing force of the compression spring 60.

In the case of a particularly large current at the time of the above-mentioned power-on and subsequent energization, the fixed electrode 2 of the bushing 3
An electromagnetic repulsive force acts between the contact portions 38 and 78 of the movable electrode 61 and the movable contact 65, but at the same time, a magnetic circuit is formed between the adsorption member 72 disposed on the base end side of the movable electrode 61 and the fixed plate 55. Ru. Therefore, by suctioning the suction member 72 to the fixed plate 55, the base end of the movable contact 65 moves around the locking part 75 on the fixed plate 55.
5 side, and the contact portion 76 is pressed against the contact portion 38 on the bushing side against the electromagnetic repulsion.

When the movable electrode section 61 is opened from the closed state shown in FIG. The base end portion of the movable contactor 65 is rotated counterclockwise around the locking portion 75 via. By the clockwise rotation of the arm 49 and the counterclockwise rotation of the movable contact 65, the movable contact 65 is brought into sliding contact with the upper part of the contact portion 38 of the power supply side bushing 3, and then the arc-proof metal 77
is brought into contact with the arc-proof metal 39 of the bushing 3, whereby both the contact portions 38 and 76 are separated. Subsequently, both arc-resistant metals 77 and 39 slide into contact with each other and then separate.

On the other hand, as shown in FIG. 8, the base end of the movable contact 65 is rotated toward the fixed plate 55 by the biasing force of the compression spring 60 around the locking portion 75, and then
It comes into contact with the fixing plate 55 as shown in the figure.

When the arc-resistant metals 77 and 39 are separated, an arc is generated between them, but the operation of the stirring plate 78 stirs the gas in the area where the arc occurs and blocks it, ensuring a sufficient insulation distance. The opening operation is then completed. As described above, in this embodiment, the movable electrode part 61 rotates about the locking part 75 when the closing is opened, and the movable electrode part 61 rotates about the locking part 75.
Since the contact portion 76 of the fixed electrode 22 slides into contact with the contact portion 38 of the fixed electrode 22 and exerts a wiper effect, it is possible to wipe away insulating fine powder generated during arcing and adhered to both the contact portions 38 and 76. contact part 38,
It is possible to prevent contamination of 76 and maintain good contact.

Next, the arm 4 on which the movable electrode section 61 is disposed
The closing/opening mechanism that operates the closing/unloading mechanism 9 will be explained.

Reference numeral 81 indicates a mounting hole provided through the upper part of the front side wall of the main body case 1 as shown in FIG. 6, and reference numeral 82 indicates the mounting hole 8.
A pair of bearing metals 83 are fitted into both the inner and outer ends of the supporting cylinder, which is welded to maintain airtightness after being inserted into the support cylinder. Reference numeral 84 denotes a handle shaft rotatably inserted into the support tube 82, and a plurality of fitting grooves 84a are recessed in the outer periphery of the support tube 82, corresponding to approximately the center thereof. An O-ring 85 is wrapped inside to ensure airtightness with respect to the support tube 82.

Reference numeral 86 denotes a handle fitted to the outer end of the handle shaft 84, and the handle shaft 84 is inserted into a mounting hole 87a formed through the boss 87 in the center thereof, and is secured by a taper pin 88 inserted from the outer periphery of the boss 87. Fixed.

Reference numeral 89 is a drive lever fixed to the inner end of the handle shaft 84, and a shaft 91 is rotatably attached to the lower end of the drive lever. 92 is a U-shaped bearing fixed to the main body case 1 at a position to the right of the rotating shaft 45, and 93 is a T-shaped base end portion relative to the bearing 92. is a rotatably supported guide rod, the tip of which is inserted into the opening 90a at the tip of the guide tube 90 so that it can slide. A compression spring 94 is wound around the outer periphery of the guide cylinder 90, and one end of the spring 94 is engaged with the lower end of the drive lever 89, and the other end is engaged with the bearing 92. Then, the drive lever 89 is rotated counterclockwise in FIG. 15, and the shaft 91 connects the axis of the handle shaft 84 and the axis of the base end of the guide rod 93 as shown in FIG. When the dead point X on the line is exceeded, the drive lever 89 is biased counterclockwise. Conversely, when the drive lever 89 is rotated clockwise in FIG. 13 and the shaft 91 exceeds the dead point X as shown in FIG. It is becoming more and more popular.

As shown in FIG. 6, a guide plate 95 is rotatably supported on the handle shaft 84 via a bearing metal 96 between the drive lever 89 and the support tube 82, and the drive lever is attached to the tip of the guide plate. A pin 97 protruding to the side is fixed. Reference numeral 98 denotes an operating lever whose base end is fixed to the front end 45a of the rotation shaft 45, and an elongated hole 98a is formed in the distal end thereof in the length direction, and the pin is inserted into the elongated hole 98a. 97 is slidably inserted. When the pin 97 rotates clockwise or counterclockwise about the handle shaft 84 via the guide plate 95, the pin 97 moves into the elongated hole 9.
By sliding inside 8a, the rotation shaft 45 is rotated counterclockwise or clockwise, respectively.

As shown in FIG. 15, 99a and 99b are a pair of operating claws that project leftward from the upper and lower parts of the left side of the drive lever 89, respectively, and the pin 97 is always positioned between the two 99a and 99b. It corresponds to the same pin 97 so that it can be locked.

When the drive lever 89 is rotated clockwise as shown in FIG. 14 while the movable electrode section 61 is in the open state, the operating claw 99b of the drive lever 89 is turned off immediately after the shaft 91 passes the dead point X. It is locked by a pin 97 so that the operating lever 98 can be rotated counterclockwise. Further, when the drive lever 89 is rotated counterclockwise as shown in FIG. 16 when the movable electrode section 61 is in the closed state, the shaft 91
Immediately after passing over the dead point

Reference numeral 100 denotes a holding lever fixed to the rear end 45b side of the rotation shaft 45 with its tip facing downward;
01 is a shaft 10 which is rotatably positioned with its tip above both sides of the tip of the holding lever 100.
a pair of C-shaped retaining links attached twice;
At both ends thereof, there are tension springs 10, one end of which is attached to a mounting member 104 disposed on the upper wall of the main body case 1.
The other end of 3 is engaged. This tension spring 1
The biasing force of 03 is set smaller than the biasing force of the compression spring 94, and when the rotating shaft 45 is rotated clockwise or counterclockwise by the biasing force of the compression spring 94, the center of attachment to the mounting member 104 is The shafts 102 are arranged to each exceed a dead point Y on a line connecting the axis of the rotary shaft 45 and the shaft center of the rotating shaft 45. The tension spring 103 holds the movable electrode section 61 in the closed state or in the open state.

Note that 105 is a stopper that restricts the amount of rotation of the holding lever 100 when the holding lever 100 is rotated clockwise, and is fixed to the main body case 1 via a fixing plate 106.

Now, this closing/opening mechanism is operated by the handle 8 when the movable electrode part 61 is in the open state as shown in FIG.
When turning 6 clockwise, the handle shaft 84
From the state shown in FIG. 13, the drive lever 89 is rotated clockwise while resisting the biasing force of the compression spring 94. When the shaft 91 crosses the dead point X as shown in FIG. 14 while the drive lever 89 is forcing the compression spring 94, the actuating claw 99b is locked to the pin 97, and the compressed spring 94 is pushing the pin 9.
7 to the handle shaft 84 via the guide plate 95.
Rotate clockwise around the center. This rotation of the pin 97 causes the operating lever 98 to rotate counterclockwise, and at the same time, the rotation shaft 45 is also rotated in the same direction. Then, the holding lever 100 is also rotated counterclockwise while exerting force on the tension spring 103 by the rotation of the rotation shaft 45, and when the shaft 102 exceeds the dead point Y, it is rotated by the biasing force of the compression spring 94 and the tension spring 103. The moving shaft 45 continues to rotate.
When the movable electrode section 61 is completely inserted through the rotation shaft 45 and the arm 49, the tension spring 10
3 maintains the closed state.

Furthermore, when the movable electrode portion 61 rotates the handle 86 of the closing mechanism counterclockwise from the closed state, the drive lever 89 resists the biasing force of the compression spring 94 via the handle shaft 84 from the state shown in FIG. while rotating counterclockwise. When the drive lever 89 forces the compression spring 94 and the shaft 91 passes the dead point X as shown in FIG. 95 to rotate the handle shaft 84 counterclockwise. This rotation of the pin 97 causes the operating lever 98 to rotate clockwise, and at the same time, the rotation shaft 45 is also rotated in the same direction. Then, the holding lever 100 is also rotated clockwise while the tension spring 103 is powered by the rotation of the rotation shaft 45, and the shaft 1
02 exceeds the dead point Y, the rotation shaft 4 is moved by the biasing force of the compression spring 94 and the tension spring 103.
5 continues to be rotated. and operating lever 98
The opening operation of the movable electrode portion 61 is completed in a state where the rotation is restricted by the stopper 105.

Effects As detailed above, this idea forms the contact part of the fixed electrode in the main body case filled with arc-extinguishing gas so that the center protrudes, and the contact part of the fixed electrode is formed at the tip of the arm fixed to the rotating shaft. An insertion hole is provided in a direction perpendicular to the rotation axis, and a fixed plate having ferromagnetic properties is fixed.A support rod is freely inserted into the upper part of the arm so as to be movable up and down, and its lower end is inserted into the insertion hole. The support rod has one end locked to the upper end of the support rod,
A biasing member is wound around the other end of which is locked to the upper part of the arm, and a movable electrode portion inserted into the insertion hole cooperates with the movable contact and the fixed plate to surround the movable contact. and a ferromagnetic adsorption member fixed to the base end of the movable contact, and the lower end of the support rod is loosely inserted into the base end of the movable contact, and the biasing member is attached to the base end of the movable contact. The movable electrode part can be brought into pressure contact with the fixed electrode by the biasing force, and the central part of the movable contact is bent in a step-like manner, and the bent part is connected to the side part of the arm on the fixed electrode side. By making the locking part rotatable, the movable electrode part rotates around the locking part when closing and opening, and the contact part of the movable electrode part slides on the contact part of the fixed electrode. Since it exerts a wiper effect when in contact, it is able to wipe away insulating fine powder that is generated during arcing and adheres to both contact areas, and this has the effect of preventing contamination of both contact areas and maintaining good contact. play.

Note that this invention is not limited to the above-mentioned embodiments, and can be arbitrarily modified without departing from the spirit of this invention.

[Brief explanation of the drawing]

Fig. 1 is a front view of a gas switch showing an embodiment of this invention, Fig. 2 is a front cross-sectional view of the bushing, and Fig. 3 is a cross-sectional view of the detent portion of the inner cavity of the bushing. Figure 4 is a right side view of the bushing, Figure 5 is a cross-sectional view of the cap of the bushing, Figure 6 is a right side view of the gas switch, and Figure 7 is a front sectional view when the movable electrode part has been inserted. , FIG. 8 is a front sectional view of the movable electrode section when it is in operation, FIG. 9 is a front sectional view when the opening is completed, and FIG. 10 is a partially cutaway front view of the gas switch in the same state as FIG. 9. Fig. 11 is a perspective view of the movable contact, Fig. 12 is a cross-sectional view showing the operation of the fixed plate and suction plate, Fig. 13 is a front view of the closing/opening mechanism when the opening is completed, and Fig. 14 is also Fig. 13. FIG. 15 is a front view of the closing operation from the state shown in FIG. 15, and FIG. 16 is a front view of the opening operation from the state of FIG. 15. Main body case...1, Fixed electrode...22, Fixed electrode contact part...38, Rotating shaft...45, Arm...
…49, Through hole…53, Fixed plate…55, Support rod…57, Biasing member (compression spring)…60, Movable electrode portion…61, Movable contact…65, Adsorption member… 72, Locking part...75, Movable electrode contact part...76.

Claims (1)

[Claims for Utility Model Registration] 1. The contact portion 38 of the fixed electrode 22 is formed in the main body case 1 filled with arc-extinguishing gas so that the center thereof protrudes, and the tip of the arm 49 is fixed to the rotating shaft 45. An insertion hole 53 is formed in the direction perpendicular to the rotation axis 45, and a fixed plate 55 having ferromagnetic properties is fixedly attached to the upper part of the arm 49. The lower end is arranged correspondingly in the insertion hole 53, and one end is placed in the support rod 57.
A biasing member 60 is wound around the upper end of the arm 49 and the other end is secured to the upper end of the arm 49. On the other hand, the movable electrode section 61 inserted into the insertion hole 53 is connected to the movable contactor 65 and the Fixed plate 55
and a ferromagnetic adsorption member 72 fixed to the base end of the movable contact 65 so as to surround the movable contact 65.
The lower end of the support rod 57 is loosely inserted into the base end, and the movable electrode part 61 can be pressed against the fixed electrode 22 by the biasing force of the biasing member 60, and the movable contactor A gas opening/closing device characterized in that the center portion of the arm 49 is bent in a step-like manner, and the bent portion serves as a locking portion 75 that rotatably locks onto the side portion of the arm 49 on the fixed electrode side. Electrode structure of the device. 2. The electrode structure for a gas switch according to claim 1, which is characterized in that a stirring plate 78 for stirring arc-extinguishing gas is provided at the tip of the movable electrode portion 61.