CN217934787U

CN217934787U - Arc extinguish chamber for gas insulation switch cabinet

Info

Publication number: CN217934787U
Application number: CN202221937751.2U
Authority: CN
Inventors: 唐良雄; 李鑫; 余仕麒; 冯明昕; 郭永兵; 贾崇飏
Original assignee: Sichuan Baoguang Electrical Appliance Equipment Co ltd
Current assignee: Sichuan Baoguang Electrical Appliance Equipment Co ltd
Priority date: 2022-07-25
Filing date: 2022-07-25
Publication date: 2022-11-29
Anticipated expiration: 2032-07-25

Abstract

The utility model discloses an explosion chamber for gas insulated switchgear, including the insulating cylinder, the sealed fixed setting of inlet wire seat is on the lateral wall of insulating cylinder, it sets up on the guide cylinder to touch the sealed fixed setting of seat, the guide cylinder is fixed to be set up on the insulating cylinder, the middle part of touching the seat is provided with the sliding hole, the conducting rod sets up in the sliding hole, the tip of conducting rod is provided with the dynamic arc contact and the spout of electrically conductive function, the coaxial fixed setting of dynamic arc contact is in the inside of spout, the sealed fixed spout that is provided with on the inner wall of dynamic arc contact tip, the one end and the spout sealing connection of interior gas cylinder, the other end outer wall of interior gas cylinder and the sealed sliding fit of inner wall of guide cylinder, the inner wall of interior gas cylinder and the outer wall clearance fit of touch seat, the bottom of interior gas cylinder is provided with first runner, be provided with the second runner that runs through on the touch seat, the opening of second runner is provided with the pneumatic valve, the one end cooperation of dynamic arc contact and quiet arc contact, the other end of quiet arc contact is fixed to be set up on the seat of being qualified for the next round of a business, the next round of a business turn of a business is fixed to be set up the tip at the insulating cylinder.

Description

Arc extinguish chamber for gas insulation switch cabinet

Technical Field

The utility model relates to a cubical switchboard technical field, in particular to explosion chamber for gas insulated switchgear.

Background

With the development of economy and social progress, the national electricity consumption continuously rises, and in order to guarantee stable power supply, each power transmission and distribution facility develops towards the directions of safety, high efficiency, space saving and low maintenance cost. Circuit breakers are no exception as an important part of the power transmission and distribution field. The circuit breaker is a component for realizing current conduction and disconnection, belonging to a high-voltage switch cabinet. In the field of 12kV to 40.5kV, vacuum circuit breakers are mostly used as elements for opening and closing (opening and closing) currents, and the circuit breakers utilize vacuum as an arc extinguishing medium, have a simple structure and excellent opening and closing capability, and are widely used in air-insulated switchgears and gas-insulated switchgears (gas-filled switches).

The vacuum arc-extinguishing chamber of the vacuum circuit breaker is roughly composed of a static conducting rod, a static contact, a moving contact, a corrugated pipe, a moving conducting rod and an insulating shell. As shown in FIG. 1, the pressure inside the insulating shell is less than 10 ^-3 Pa, the bellows starts the sealing action, the movable conducting rod drives the movable contact to move, and the movable contact is contacted with and separated from the fixed contact to realize the conduction and the disconnection of the current. When the switch is opened, the moving contact and the static contact are separated gradually from the contact state, electric arc can be generated between the contacts, and the electric arc can be cut off within a few milliseconds due to the extremely strong vacuum arc extinguishing capabilityThe purpose of cutting off the current is achieved. However, when a reactive power compensation device (SVG) is switched, because the current and the voltage are asynchronous, a vacuum arc-extinguishing chamber suddenly cuts off the non-zero current in a very short time, the voltage between contacts is increased because the current suddenly changes to zero in a non-zero state, the highest voltage can reach several times of rated voltage, the insulation between the contacts is possibly broken down by the high voltage at the moment, an electric arc is generated again, the current is conducted again through the electric arc, and the phenomenon of reignition caused by the operation overvoltage and the operation overvoltage is caused. This phenomenon is extremely dangerous in power transmission and distribution, and as a result, the explosion of the vacuum arc-extinguishing chamber may cause a short-circuit accident, which directly affects the safety of personnel and the safety of the power system. Although the uniformity of electric field distribution on the contacts is increased by ablating tiny metal tips among the contacts of the vacuum arc-extinguishing chamber in advance through aging treatment at present, so that the insulating capability among the contacts is improved, and the restriking probability is reduced, the restriking can not be completely avoided when the vacuum arc-extinguishing chamber is switched into a reactive power compensation device (SVG).

At present, in a traditional air-insulated switch cabinet, a sulfur hexafluoride breaker which can not generate operation overvoltage like a vacuum breaker is used for switching a reactive compensation device (SVG), but in a gas-insulated switch cabinet (an inflation cabinet), because of technical and size limitations, no sulfur hexafluoride breaker is used for switching the reactive compensation device (SVG) at present, and the vacuum breaker processed by the traditional method can be used only temporarily, so that the fault risk of electrical equipment is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a explosion chamber for gas insulated switchgear.

The purpose of the utility model is realized through the following technical scheme:

an arc extinguish chamber for a gas insulated switchgear comprises an insulating cylinder, a conductive rod, a contact seat, a wire inlet seat, a gas valve, an inner cylinder, a guide cylinder, a movable arc contact, a nozzle, a wire outlet seat, an insulating rod and a static arc contact, wherein the wire inlet seat is fixedly arranged on the side wall of the insulating cylinder in a sealing way and is fixedly connected with the contact seat, the contact seat is fixedly arranged on the inner wall of one end of the guide cylinder in a sealing way, the guide cylinder is fixedly arranged on the inner wall of the insulating cylinder, a sliding hole is formed in the middle of the contact seat, the conductive rod is arranged in the sliding hole and is matched with the sliding hole, the outer end of the conductive rod is connected with the insulating rod, the movable arc contact with a conductive function is fixedly arranged at the end part of the inner end part of the conductive rod in a sealing way, the movable arc contact is coaxially and fixedly arranged in the inner part of the movable arc contact, the nozzle is fixedly arranged on the outer wall of the end part of the movable arc contact, the nozzle is provided with an arc extinguishing arc, the arc extinguishing arc is in clearance fit with the end part of the moving arc contact, one end of the inner cylinder is in sealed connection with the nozzle, the outer wall of the other end of the inner cylinder is in sealed sliding fit with the inner wall of the guide cylinder, the inner wall of the inner cylinder is in clearance fit with the outer wall of the contact seat, the bottom of the inner cylinder is provided with a first flow passage which penetrates through the inner cylinder, one end of the first flow passage is arranged inside the inner cylinder, the other end of the first flow passage is arranged between the nozzle and the moving arc contact, the contact seat is provided with a second flow passage which penetrates through the inner cylinder, one end of the second flow passage is arranged outside the guide cylinder, the other end of the second flow passage is arranged inside the guide cylinder, the opening part of the second flow passage is provided with the air valve, and the moving arc contact is matched with one end of the static arc contact, the other end of the static arc contact is fixedly arranged on the wire outlet seat, and the wire outlet seat is fixedly arranged at the end part of the insulating cylinder.

Furthermore, a moving contact is fixedly arranged on the outer wall of the nozzle and is electrically connected with the conducting rod.

Furthermore, a fixed contact is arranged on the outer side of the fixed arc contact, one end of the fixed contact is matched with the movable contact, and the other end of the fixed contact is electrically connected with the wire outlet seat.

Furthermore, the outer wall of the static arc contact is matched with the inner wall of the dynamic arc contact, and the outer wall of the dynamic contact is matched with the inner wall of the static contact.

Furthermore, the cross sections of the conducting rod and the static arc contact are both circular.

Furthermore, be provided with on the inner wall of sliding hole and touch and indicate the groove, touch and indicate the inslot be provided with the outer wall of conducting rod fully contacts and have the elasticity of electrically conductive function and touch and indicate.

Further, still include interior casing, transmission component, operating component, atmospheric pressure part and circuit breaker casing, the sealed setting of interior casing is in on the inner wall of circuit breaker casing, the sealed fixed setting of insulating cylinder is in on the outer wall of circuit breaker casing, be provided with on the circuit breaker casing and make interior casing with the removal hole of insulating cylinder intercommunication, the insulator spindle passes behind the removal hole with transmission component's output links to each other, transmission component passes behind the lateral wall of interior casing with operating component links to each other, transmission component with operating component all sets up the inside of circuit breaker casing, transmission component with the sealed cooperation of lateral wall of interior casing, atmospheric pressure part sets up circuit breaker casing and with interior casing sealing connection.

Further, the air pressure component comprises a density relay, a three-way pipe and a pipeline, the three-way pipe is fixedly arranged on the breaker shell, an opening in the upper end of the three-way pipe is connected with the density relay in a sealing mode, an opening in the lower end of the three-way pipe is connected with one end of the pipeline, the other end of the pipeline extends into the inner shell, the inner shell is connected with the side wall of the pipeline in a sealing mode, an opening in the side end of the three-way pipe is connected with an air source, and a valve is arranged on the three-way pipe.

Furthermore, the nozzle is coaxially provided with a nozzle hole which is in clearance with the side wall of the static arc contact.

Further, the air valve is an elastic rubber ring.

The utility model has the advantages that:

1) The inner shell and the insulating cylinder are hermetically fixed on the frame assembly to form a sealed chamber, the sealed chamber is filled with sulfur hexafluoride arc-extinguishing gas, the gas pressure component is used for providing sulfur hexafluoride gas with certain pressure for the sealed chamber, and the sulfur hexafluoride gas realizes arc extinguishing when the fixed contact component and the movable contact component are switched on and off. .

2) The density relay is mainly used for detecting the air pressure inside the inner shell and the insulating cylinder and preventing the air pressure inside from leaking.

3) The length of the static arc contact is greater than that of the static contact, when the switch is switched on, the static arc contact is firstly inserted into the dynamic arc contact to be electrified, and then the dynamic contact is inserted into the static contact to be electrified; when the switch is switched off, the moving contact and the static contact are separated firstly to generate no electric arc, then the static arc contact and the moving arc contact are separated to generate the electric arc, and the generated electric arc is extinguished by gas, so that the purpose of arc extinction is achieved.

Drawings

FIG. 1 is a schematic diagram of a prior art structure;

FIG. 2 is a schematic view of the connection structure of the arc chute in the switchgear;

FIG. 3 is a three-dimensional connection structure diagram of the arc extinguish chamber in the switch cabinet;

FIG. 4 is a diagram of an internal cross-sectional connecting structure of the arc chute;

FIG. 5 is a diagram of the internal cross-sectional connection of the arc chute in the switchgear;

fig. 6 is a conductive control three-dimensional connection structure diagram of the present invention;

fig. 7 is a perspective connection structure diagram between the fixed contact part and the movable contact part;

FIG. 8 is a perspective view showing the construction of the connection between the inside cylinder and the electric conductive rod;

in the figure, 1-insulating cylinder, 2-conducting rod, 3-contact seat, 4-wire inlet seat, 5-air valve, 6-internal cylinder, 7-guide cylinder, 8-moving arc contact, 9-nozzle, 10-wire outlet seat, 11-insulating rod, 12-static arc contact, 13-arc extinguishing arc, 14-first flow channel, 15-second flow channel, 16-moving contact, 17-static contact, 18-finger groove, 19-elastic finger, 20-internal shell, 21-transmission component, 22-operation component, 23-breaker shell, 24-moving hole, 25-density relay, 26-three-way pipe, 27-pipeline, 28-valve and 29-nozzle.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 2-8, the present invention provides a technical solution:

an arc extinguish chamber for a gas insulated switchgear, which comprises an insulating cylinder 1, a conductive rod 2, a contact seat 3, a wire inlet seat 4, a gas valve 5, an inner cylinder 6, a guide cylinder 7, a moving arc contact 8, a nozzle 9, a wire outlet seat 10, an insulating rod 11 and a static arc contact 12, wherein the wire inlet seat 4 is fixedly arranged on the side wall of the insulating cylinder 1 in a sealing way and is fixedly connected with the contact seat 3, the contact seat 3 is fixedly arranged on the inner wall of one end of the guide cylinder 7 in a sealing way, the guide cylinder 7 is fixedly arranged on the inner wall of the insulating cylinder 1, a sliding hole is arranged in the middle of the contact seat 3, the conductive rod 2 is arranged in the sliding hole and is matched with the sliding hole, the outer end of the conductive rod 2 is connected with the insulating rod 11, the moving arc contact 8 with a conductive function is fixedly arranged at the end part of the inner end part of the conductive rod 2 in a sealing way, the moving arc contact 8 is coaxially and fixedly arranged in the nozzle 9, the outer wall of the end part of the moving arc contact 8 is fixedly arranged in a sealing way, an arc extinguishing arc 13 is arranged on the nozzle 9, the arc extinguishing arc 13 is in clearance fit with the end part of the movable arc contact 8, one end of the inner cylinder 6 is in sealed connection with the nozzle 9, the outer wall of the other end of the inner cylinder 6 is in sealed sliding fit with the inner wall of the guide cylinder 7, the inner wall of the inner cylinder 6 is in clearance fit with the outer wall of the contact seat 3, a first flow passage 14 which penetrates through the bottom of the inner cylinder 6 is arranged at one end of the first flow passage 14, the inner cylinder 6 is arranged inside the first flow passage 14, the other end of the first flow passage 14 is arranged between the nozzle 9 and the movable arc contact 8, a second flow passage 15 which penetrates through the contact seat 3 is arranged on the outer portion of the guide cylinder 7, the other end of the second flow passage 15 is arranged inside the guide cylinder 7, an air valve 5 is arranged at the opening part of the second flow passage 15, the movable arc contact 8 is in clearance fit with one end of the fixed arc contact 12, and the other end of the fixed arc contact 12 is arranged on the wire outlet seat 10, the wire outlet seat 10 is fixedly arranged at the end part of the insulating cylinder 1. A moving contact 16 is fixedly arranged on the outer wall of the nozzle 9, and the moving contact 16 is electrically connected with the conducting rod 2. The nozzle 9 is coaxially provided with a nozzle hole 29 having a clearance with the sidewall of the stationary arc contact 12. A static contact 17 is arranged on the outer side of the static arc contact 12, one end of the static contact 17 is matched with the movable contact 16, and the other end of the static contact 17 is electrically connected with the outlet base 10. The outer wall of the static arc contact 12 is matched with the inner wall of the moving arc contact 8, and the outer wall of the moving contact 16 is matched with the inner wall of the static contact 17. The cross sections of the conducting rod 2 and the static arc contact 12 are circular. The air valve 5 is an elastic rubber ring. The outlet seat 10 is used for connecting a high-voltage circuit at an output side, the inlet seat 4 is connected with the high-voltage circuit at an input side, the inner shell 20 and the insulating cylinder 1 are hermetically fixed on a breaker shell 23 to form a sealed chamber, the sealed chamber is filled with sulfur hexafluoride arc extinguishing gas, the gas pressure component is used for providing sulfur hexafluoride gas with certain pressure for the sealed chamber, and arc extinguishing is realized when the sulfur hexafluoride gas is switched on and off between the fixed contact component and the movable contact component. The insulating cylinder 1 is made of an insulating material of the prior art, such as ceramic. The conductive rod 2 is a cylindrical and hollow high-voltage conductive rod, the conductive rod 2 is matched with a sliding hole of a contact base 3, the conductive rod 2 can slide in the sliding hole when high voltage is switched on and off, a sealing ring is arranged between the outer wall of the conductive rod 2 and the inner wall of the sliding hole, the sealing connection between the conductive rod 2 and the contact base 3 is realized, the contact base 3 is fixedly connected with an incoming line base 4, high voltage electricity entering the incoming line base 4 is transmitted to the conductive rod 2 through the contact base 3, the conductive rod 2 transmits the high voltage electricity to a movable contact 16 and a movable arc contact 8, the cross sections of the movable contact 16 and the movable arc contact 8 are circular rings, the outer diameter of the movable arc contact 8 is as large as that of the conductive rod 2, the movable contact 16 and the movable arc contact 8 are both fixedly and hermetically connected with the end part of the conductive rod 2, the contact base 3 is fixed on the inner wall of the conductive rod 2 through a guide cylinder 7, the movable contact 16 and the movable arc contact 8 are in the moving process along with the conductive rod 2, the movable contact 16 and the movable arc contact 8 are always positioned inside the guide cylinder 7, one end part of an inner cylinder 6 is fixedly connected with the inner wall of the guide cylinder 7, and the sealing ring is arranged between the inner wall of the guide cylinder 6. The gas valve 5 is a rubber ring, when the switch is switched on, the conducting rod 2 drives the inner cylinder 6, the movable contact 16 and the moving arc contact 8 to move towards the side of the wire outlet seat 10 instantly together, negative pressure appears in the inner cylinder 6 instantly at the moment, so that the gas valve 5 is opened, gas in the insulating cylinder 1 enters the inner cylinder 6 through the second flow channel 15, meanwhile, the gas can also enter the inner cylinder 6 through the nozzle 9 and the first flow channel 14, so that the gas storage amount in a space formed by the inner cylinder 6 and the guide cylinder 7 is increased, when the switch is switched off, the conducting rod 2 moves towards the side far away from the static contact part instantly, the gas storage in the space formed by the inner cylinder 6 and the guide cylinder 7 is compressed, and at the moment, the gas valve 5 is in a closed state, the gas can only be discharged from the first flow channel 14, so that the gas enters the contact position between the moving arc contact 8 and the static arc contact 12, and electric arcs generated between the moving arc contact 8 and the static arc contact 12 can be extinguished. The nozzle 9 has two functions, namely, the nozzle plays a role in guiding the static arc contact 12 during moving, and the nozzle can enable gas to fully extinguish electric arcs in the moment through the arc extinguishing arc 13. The outlet seat 10 is used for connecting an output high-voltage circuit, the static arc contact 12 can be inserted into the moving arc contact 8, the moving contact 16 can be inserted into the static contact 17, when the switch is switched on, the static arc contact 12 is firstly inserted into the moving arc contact 8 to be electrified, and then the moving contact 16 is inserted into the static contact 17 to be electrified. When the switch is switched off, the moving contact 16 is separated from the static contact 17 firstly, no electric arc is generated, then the static arc contact 12 is separated from the moving arc contact 8, the electric arc can be generated, and the generated electric arc can be extinguished by gas, so that the purpose of arc extinction is achieved. Both the stationary arcing contact 12 and the stationary contact 17 can be electrically conductive and have a circular cross-section. The length of the fixed arc contact 12 is greater than that of the movable contact 16, so that arc extinction is facilitated.

In some embodiments, a finger groove 18 is disposed on the inner wall of the sliding hole, and an elastic finger 19 having a conductive function and being in sufficient contact with the outer wall of the conductive rod 2 is disposed in the finger groove 18. The elastic contact finger 19 is made of conductive wire in the prior art into a spiral shape and then placed in the contact finger groove 18, so that the conductive rod 2 and the contact seat 3 are in full contact, and high-voltage power transmission is facilitated.

In some embodiments, the circuit breaker further includes an inner housing 20, a transmission component 21, an operation component 22, an air pressure component and a circuit breaker housing 23, wherein the inner housing 20 is hermetically disposed on an inner wall of the circuit breaker housing 23, the insulation tube 1 is hermetically and fixedly disposed on an outer wall of the circuit breaker housing 23, the circuit breaker housing 23 is provided with a moving hole 24 for communicating the inner housing 20 with the insulation tube 1, the insulation rod 11 passes through the moving hole 24 and then is connected to an output end of the transmission component 21, the transmission component 21 passes through a sidewall of the inner housing 20 and then is connected to the operation component 22, both the transmission component 21 and the operation component 22 are disposed inside the circuit breaker housing 23, the transmission component 21 is hermetically engaged with the sidewall of the inner housing 20, and the air pressure component is disposed in the circuit breaker housing 23 and hermetically connected to the inner housing 20. The sulfur hexafluoride circuit breaker is a three-phase circuit breaker, three arc extinguish chamber components are controlled by the transmission component 21 to achieve circuit connection and disconnection simultaneously, and the arc extinguish chambers are used for achieving rapid arc extinction when the circuit is connected and disconnected.

In some embodiments, the pneumatic component includes a density relay 25, a tee 26 and a pipe 27, the tee 26 is fixedly disposed on the circuit breaker housing 23, and an upper opening of the tee 26 is connected to the density relay 25 in a sealing manner, a lower opening of the tee 26 is connected to one end of the pipe 27, the other end of the pipe 27 extends into the inner housing 20, the inner housing 20 is connected to a side wall of the pipe 27 in a sealing manner, a side opening of the tee 26 is connected to a gas source, and a valve 28 is disposed on the tee 26. The density relay 25 is in the prior art and is mainly used for detecting the air pressure inside the inner shell 20 and the insulating cylinder 1 and preventing the internal gas pressure from leaking, one end of the three-way pipe 26 is connected with the density relay 25, the other end of the three-way pipe is connected with the pipeline 27, the pipeline 27 is communicated with the three inner shells 20 for three-phase power transmission, the last end of the three-way pipe is connected with an air source, when the internal air pressure is insufficient, the valve 28 in the prior art is directly opened to ventilate the inner shell 20, and sulfur hexafluoride gas is stored in the air source.

The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein and that the invention is not to be considered as limited to the disclosed embodiments, but is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. The utility model provides an explosion chamber for gas insulated switchgear, its characterized in that: the arc extinguishing device comprises an insulating cylinder (1), a conductive rod (2), a contact seat (3), a wire inlet seat (4), an air valve (5), an inner cylinder (6), a guide cylinder (7), a moving arc contact (8), a nozzle (9), a wire outlet seat (10), an insulating rod (11) and a static arc contact (12), wherein the wire inlet seat (4) is fixedly arranged on the side wall of the insulating cylinder (1) in a sealing manner and is fixedly connected with the contact seat (3), the contact seat (3) is fixedly arranged on the inner wall of one end of the guide cylinder (7) in a sealing manner, the guide cylinder (7) is fixedly arranged on the inner wall of the insulating cylinder (1), a sliding hole is formed in the middle of the contact seat (3), the outer end of the conductive rod (2) is arranged in the sliding hole and is matched with the sliding hole, the inner end of the conductive rod (2) is connected with the insulating rod (11), the moving arc contact (8) with the arc contact (8) with a conductive function is fixedly arranged at the end of the conductive rod (2) in a sealing manner, the moving arc contact (8) is coaxially arranged in the contact seat (9), the inner wall of the moving arc contact (9), the nozzle (13) is arranged at the end of the arc contact seat (9), the arc contact (13) in a sealing manner, and is arranged at the gap between the arc contact end of the arc contact (9), the sealing device is characterized in that one end of the inner cylinder (6) is connected with the nozzle (9) in a sealing mode, the outer wall of the other end of the inner cylinder (6) is in sealing sliding fit with the inner wall of the guide cylinder (7), the inner wall of the inner cylinder (6) is in clearance fit with the outer wall of the contact seat (3), a first flow channel (14) penetrating through the outer wall of the inner cylinder (6) is arranged at one end of the first flow channel (14), the other end of the first flow channel (14) is arranged between the nozzle (9) and the moving arc contact (8), a second flow channel (15) penetrating through the inner wall of the contact seat (3) is arranged at one end of the guide cylinder (7), the other end of the second flow channel (15) is arranged at the inner part of the guide cylinder (7), an opening part of the second flow channel (15) is provided with the air valve (5), the moving arc contact (8) is matched with one end of the guide cylinder (12), the fixed arc contact (12) is arranged at the other end of the fixed wire outlet seat (10), and the wire outlet seat (10) is arranged at the end part of the insulation cylinder (10).

2. An arc chute for a gas insulated switchgear according to claim 1, characterized in that: a moving contact (16) is fixedly arranged on the outer wall of the nozzle (9), and the moving contact (16) is electrically connected with the conducting rod (2).

3. An arc chute for a gas insulated switchgear according to claim 2, characterized in that: a fixed contact (17) is arranged on the outer side of the fixed arc contact (12), one end of the fixed contact (17) is matched with the movable contact (16), and the other end of the fixed contact (17) is electrically connected with the wire outlet base (10).

4. An arc extinguish chamber for a gas insulated switchgear, according to claim 3, characterized in that: the outer wall of the static arc contact (12) is matched with the inner wall of the moving arc contact (8), and the outer wall of the moving contact (16) is matched with the inner wall of the static contact (17).

5. An arc chute for a gas insulated switchgear, according to any of claims 1-4, characterized in that: the cross sections of the conducting rod (2) and the static arc contact (12) are both circular.

6. An arc chute for a gas insulated switchgear, according to any of claims 1-4, characterized in that: be provided with on the inner wall of sliding hole and touch finger groove (18), be provided with in touch finger groove (18) with the outer wall of conducting rod (2) fully contacts and have electrically conductive function's elasticity touch finger (19).

7. An arc chute for a gas insulated switchgear, according to any of claims 1-4, characterized in that: still include interior casing (20), transmission component (21), operating component (22), atmospheric pressure part and circuit breaker casing (23), interior casing (20) is sealed to be set up on the inner wall of circuit breaker casing (23), insulating cylinder (1) is sealed fixed to be set up on the outer wall of circuit breaker casing (23), be provided with on circuit breaker casing (23) and make interior casing (20) with remove hole (24) of insulating cylinder (1) intercommunication, insulator spindle (11) pass remove behind hole (24) with the output of transmission component (21) links to each other, transmission component (21) pass behind the lateral wall of interior casing (20) with operating component (22) link to each other, transmission component (21) with operating component (22) all sets up the inside of circuit breaker casing (23), transmission component (21) with the sealed cooperation of the lateral wall of interior casing (20), atmospheric pressure part sets up circuit breaker casing (23) and with interior casing (20) sealing connection.

8. The arc extinguish chamber for the gas insulated switchgear according to claim 7, wherein: the pneumatic component comprises a density relay (25), a three-way pipe (26) and a pipeline (27), the three-way pipe (26) is fixedly arranged on the breaker shell (23), an opening at the upper end of the three-way pipe (26) is connected with the density relay (25) in a sealing mode, an opening at the lower end of the three-way pipe (26) is connected with one end of the pipeline (27), the other end of the pipeline (27) extends into the inner shell (20), the inner shell (20) is connected with the side wall of the pipeline (27) in a sealing mode, an opening at the side end of the three-way pipe (26) is connected with an air source, and a valve (28) is arranged on the three-way pipe (26).

9. An arc chute for a gas insulated switchgear, according to any of claims 1-4, characterized in that: the air valve (5) is an elastic rubber ring.

10. An arc chute for a gas insulated switchgear, according to any of claims 1-4, characterized in that: and the nozzle (9) is coaxially provided with a nozzle hole (29) which is in clearance with the side wall of the static arc contact (12).