An arc extinguishing device for a vacuum circuit breaker

Abstract

The present invention discloses an arc extinguishing device for a vacuum circuit breaker, which includes an arc extinguishing chamber body, a conductive rod, a bellows, a moving contact and a static contact. A conductive plate is provided on the inner wall of the static contact. In this arc extinguishing device of the vacuum circuit breaker, the moving mechanism drives the conductive plate to move to the contact position between the moving contact and the static contact, thereby increasing the contact area between the moving contact and the static contact during normal operation, reducing the heat generated at the contact position between the moving contact and the static contact during normal operation, and during arc extinguishing, the moving mechanism works to pull the conductive plate upward to accelerate the separation of the conductive plate from the moving contact. At the same time, the buffer spring in the buffer mechanism can play the role of an iron core, further increasing the longitudinal magnetic field to relieve the contraction of the arc when interrupting the current, making the arc present a diffusion state and reducing the ablation of the contact during the arcing process.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum circuit breakers, and specifically to an arc extinguishing device for a vacuum circuit breaker. Background Art

[0002] The vacuum circuit breaker gets its name because both the arc extinguishing medium and the insulating medium in the contact gap after arc extinguishing are high vacuum; it has the advantages of small volume, light weight, being suitable for frequent operation, and no need for maintenance of arc extinguishing, and is widely used in the distribution network. The vacuum circuit breaker is an indoor power distribution device in a 3 - 10 kV, 50 Hz three - phase AC system, and can be used for the protection and control of electrical equipment in industrial and mining enterprises, power plants, and substations. It is especially suitable for places that require oil - free, less maintenance, and frequent operation. The circuit breaker can be configured in medium - mounted cabinets, double - layer cabinets, and fixed cabinets to control and protect high - voltage electrical equipment.

[0003] The vacuum interrupter, also known as the vacuum switch tube, is the core component of medium - and high - voltage power switches. Its main function is to quickly extinguish the arc and suppress the current after the medium - and high - voltage circuit cuts off the power through the excellent insulation of the vacuum inside the tube, avoiding accidents and unexpected situations. It is mainly applied to the power transmission and distribution control system, and also applied to the distribution systems such as metallurgy, mines, petroleum, chemical industry, railways, broadcasting, communication, and industrial high - frequency heating. However, taking the current longitudinal magnetic field contact system as an example, usually, when the cup - shaped longitudinal magnetic contact system operates at the rated current, the contact structure is complex, and the conduction resistance of the contact structure is relatively large. This leads to a large amount of heat at the contact part of the contacts, posing a safety hazard and shortening the service life of the arc extinguishing device. For this reason, we propose an arc extinguishing device for a vacuum circuit breaker. Summary of the Invention

[0004] The purpose of the present invention is to provide an arc extinguishing device for a vacuum circuit breaker to solve the problems raised in the above - mentioned background art.

[0005] To achieve the above - mentioned purpose, the present invention provides the following technical solution: An arc extinguishing device for a vacuum circuit breaker, including an interrupter body, a conducting rod, a bellows, a moving contact, and a static contact. A conducting plate is provided on the inner wall of the static contact, and a moving mechanism is provided outside the conducting plate, which can drive the conducting plate to contact or separate from the moving contact according to the working state; above the conducting plate, a buffering mechanism is provided to buffer the movement of the conducting plate, and the buffering mechanism is connected to the inner wall of the static contact.

[0006] Preferably, the moving mechanism includes moving wheels arranged outside the conductive plate. The moving wheels are connected to the inclined grooves on the surface of the static contact. A first connecting seat is arranged outside the moving wheels. A connecting rod is arranged outside the first connecting seat. A second connecting seat is arranged at one end of the connecting rod away from the first connecting seat. The second connecting seat is connected to the arc extinguishing chamber body. Rotating balls are arranged at both ends of the connecting rod. Rotating grooves capable of rotatably connecting with the rotating balls are arranged on the inner walls of the first connecting seat and the second connecting seat. A limiting block is arranged outside the second connecting seat. A limiting groove capable of slidably connecting with the limiting block is arranged on the inner wall of the arc extinguishing chamber body. A transmission rod is arranged at the bottom of the second connecting seat. A transmission groove capable of slidably connecting with the transmission rod is arranged on the inner wall of the arc extinguishing chamber body. A driving member is arranged at one end of the transmission rod. A plurality of communication grooves are arranged on the inner wall of the conductive plate. A clamping member capable of clamping with the inclined grooves at the openings of the moving contact and the static contact is arranged on the inner wall of the communication groove.

[0007] Preferably, the driving member includes a first rack arranged at one end of the transmission rod. A transmission gear is arranged outside the first rack. A support rod is arranged at the center of the transmission gear. Both ends of the support rod are respectively connected to the inner wall of the arc extinguishing chamber body. A second rack is arranged on one side of the transmission gear. The second rack is connected to the conductive rod.

[0008] Preferably, the clamping member includes a clamping block arranged on the inner wall of the communication groove. Sliders are respectively arranged on both sides of the clamping block. A sliding groove capable of slidably connecting with the slider is arranged on the inner wall of the communication groove. A spring piece is arranged at one end of the clamping block. One end of the spring piece is connected to the inner wall of the communication groove. A pushing block is arranged above one end of the clamping block close to the spring piece. A pushing member capable of pushing the pushing block to move is arranged outside the pushing block.

[0009] Preferably, the pushing member includes a pushing plate arranged outside the pushing block. A support plate is arranged at one end of the pushing plate. The support plate is connected to the buffer mechanism.

[0010] Preferably, the buffer mechanism includes a telescopic conductive column arranged above the conductive plate. One end of the telescopic conductive column is connected to the support plate. The other end of the telescopic conductive column is connected to the inner wall of the static contact. A buffer spring is arranged outside the telescopic conductive column. Both ends of the buffer spring are respectively connected to the inner wall of the static contact and the support plate.

[0011] Preferably, two moving wheels are provided, and the two moving wheels are spaced 180°.

[0012] Preferably, the number of the communication grooves corresponds to the inclined grooves on the surface of the static contact.

[0013] Preferably, the shape of the pushing plate is arc-shaped.

[0014] Preferably, the shape of the transmission rod is L-shaped.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] When the present invention is in a normal working state, the bellows drives the conductive rod to make the moving contact contact the static contact. The movement of the conductive rod drives the moving mechanism to work. The moving mechanism drives the conductive plate to move to the contact position between the moving contact and the static contact, and makes the clamping block on the inner wall of the conductive plate slide out and be clamped with the inclined groove on the surface of the static contact and the moving contact on the inner wall of the communication groove, thereby increasing the contact area between the moving contact and the static contact during normal operation, reducing the heat generated at the contact position between the moving contact and the static contact during normal operation, and when arc extinguishing is carried out, the bellows drives the moving contact and the static contact to separate, the conductive rod drives the moving mechanism to work, and the moving mechanism works to pull the conductive plate to move upward, thereby accelerating the separation of the conductive plate from the moving contact. At the same time, the buffer spring in the buffer mechanism can play the role of the iron core, further increasing the longitudinal magnetic field to relieve the contraction of the arc when breaking the current, making the arc present a diffused state, reducing the ablation of the contact during the arcing process, thereby ensuring the breaking capacity of the vacuum circuit breaker and reducing the consumption of the service life of the moving contact and the static contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 is a schematic front sectional view of the structure of the present invention;

[0019] Figure 3 is a schematic front sectional view of the limit groove structure of the present invention;

[0020] Figure 4 is a schematic diagram of the connection between the static contact and the moving contact of the structure of the present invention;

[0021] Figure 5 is a schematic diagram of the separation of the moving mechanism of the structure of the present invention;

[0022] Figure 6 is a schematic top sectional view of the clamping member of the structure of the present invention;

[0023] Figure 7 is a schematic top sectional view of the sliding groove of the structure of the present invention;

[0024] Figure 8 is a schematic diagram of the separation of the rotating ball and the rotating groove of the structure of the present invention;

[0025] Figure 9 is a schematic front sectional view of the moving mechanism of the structure of the present invention;

[0026] Figure 10 is a schematic front sectional view of the driving member of the structure of the present invention.

[0027] In the figure: 1 - arc extinguishing chamber body; 2 - conducting rod; 3 - bellows; 4 - moving contact; 5 - static contact; 6 - conducting plate; 7 - moving mechanism; 70 - moving wheel; 71 - connecting seat one; 72 - connecting rod; 73 - connecting seat two; 74 - rotating ball; 75 - rotating groove; 76 - limiting block; 77 - limiting groove; 78 - transmission rod; 79 - transmission groove; 7A - driving part; 7B - communicating groove; 7C - clamping part; 7D - rack one; 7E - transmission gear; 7F - support rod; 7G - rack two; 7H - clamping block; 7J - slider; 7K - sliding groove; 7L - spring piece; 7M - pushing block; 7N - pushing part; 7P - pushing plate; 7Q - support plate; 7R - rotating seat one; 7S - first connecting plate; 7T - fixing rod; 7U - compression spring; 7V - second connecting plate; 7W - rotating seat two; 7X - fixing plate; 8 - buffer mechanism; 8O - telescopic conducting column; 81 - buffer spring. Detailed implementation manners

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0029] Please refer to Figure 1-8, the present invention provides a technical solution: an arc extinguishing device for a vacuum circuit breaker, including an arc extinguishing chamber body 1, a conducting rod 2, a bellows 3, a moving contact 4 and a static contact 5. The conducting rod 2 is fixedly connected to the moving contact 4 and the static contact 5 respectively. The bellows 3 is located outside the conducting rod 2 connected to the moving contact 4. A conducting plate 6 is slidably connected to the inner wall of the static contact 5. A moving mechanism 7 is provided outside the conducting plate 6, which can drive the conducting plate 6 to contact or separate from the moving contact 4 according to the working state. Above the conducting plate 6, a buffering mechanism 8 is provided to buffer the movement of the conducting plate 6. The buffering mechanism 8 is connected to the inner wall of the static contact 5. During normal operation, the bellows 3 drives the conducting rod 2 to move upward, the conducting rod 2 drives the moving contact 4 to approach the static contact 5 and contact the static contact 5. When the conducting rod 2 moves, the conducting rod 2 drives the moving mechanism 7 to work. The moving mechanism 7 drives the conducting plate 6 to move to the contact position between the moving contact 4 and the static contact 5, and makes the clamping block 7H on the inner wall of the conducting plate 6 slide out and be clamped with the inclined grooves on the surfaces of the static contact 5 and the moving contact 4 at the inner wall of the communication groove 7B, so that the contact position between the moving contact 4, the static contact 5 and the conducting plate 6 is cylindrical, thereby increasing the contact area between the moving contact 4 and the static contact 5 during normal operation, and reducing the heat generated at the contact position between the moving contact 4 and the static contact 5 during normal operation. During arc extinguishing, the bellows 3 drives the conducting rod 2 to move downward, the conducting rod 2 drives the moving contact 4 to separate from the static contact 5. When the conducting rod 2 moves, it drives the moving mechanism 7 to work. The moving mechanism 7 drives the conducting plate 6 to move upward, so as to accelerate the separation of the conducting plate 6 from the moving contact 4. The buffering mechanism 8 buffers the movement of the conducting plate 6. At the same time, the buffering mechanism 8 can also act as an iron core, further increasing the longitudinal magnetic field to relieve the contraction of the arc when interrupting the current, making the arc present a diffusion state, reducing the ablation of the contacts during the arcing process, thereby ensuring the interrupting ability of the vacuum circuit breaker and reducing the consumption of the service life of the moving contact 4 and the static contact 5.

[0030] The moving mechanism 7 includes moving wheels 70 rotatably connected to the outer side of the conductive plate 6. There are two moving wheels 70, and the two moving wheels 70 are spaced 180° apart to cooperate in supporting both sides of the conductive plate 6. The moving wheels 70 are in rolling connection with the inner wall of the inclined groove on the surface of the static contact 5. A first connecting seat 71 is fixedly connected to the outer side of the moving wheel 70. The connecting rod 72 is located outside the first connecting seat 71. A second connecting seat 73 is located outside one end of the connecting rod 72 away from the first connecting seat 71. The second connecting seat 73 is in sliding connection with the inner wall of the arc extinguishing chamber body 1. Rotating balls 74 are fixedly connected to both ends of the connecting rod 72. Rotating grooves 75 capable of rotatably connecting with the rotating balls 74 are formed in the inner walls of the first connecting seat 71 and the second connecting seat 73. A limiting block 76 is fixedly connected to the outer side of the second connecting seat 73. A limiting groove 77 capable of slidingly connecting with the limiting block 76 is formed in the inner wall of the arc extinguishing chamber body 1. A transmission rod 78 is fixedly connected to the bottom of the second connecting seat 73. The transmission rod 78 is in an L shape. A transmission groove 79 capable of slidingly connecting with the transmission rod 78 is provided on the inner wall of the arc extinguishing chamber body 1. A driving member 7A is provided at one end of the transmission rod 78. A plurality of communication grooves 7B are provided in the inner wall of the conductive plate 6. The number of the communication grooves 7B corresponds to the inclined grooves on the surface of the static contact 5. A clamping member 7C capable of clamping with the inclined grooves at the openings of the moving contact 4 and the static contact 5 is provided on the inner wall of the communication groove 7B. When the moving mechanism 7 works, the conductive rod 2 drives the driving member 7A to work. The driving member 7A drives the transmission rod 78 to move downward along the inner wall of the transmission groove 79. The transmission rod 78 drives the second connecting seat 73 to move downward. The second connecting seat 73 drives the connecting rod 72 to move. The connecting rod 72 drives the first connecting seat 71 to move. The first connecting seat 71 drives the moving wheel 70 to roll along the inner wall of the inclined groove on the surface of the static contact 5. When the moving wheel 70 rolls along the inner wall of the inclined groove, the inner wall of the inclined groove pushes the first connecting seat 71 to tilt to one side. The connecting rod 72 can tilt according to the movement of the moving wheel 70 through the rotation of the rotating ball 74 in the inner wall of the rotating groove 75. While the moving wheel 70 drives the conductive plate 6 to move downward, it rotates. When the conductive plate 6 moves to the opening of the static contact 5, the clamping member 7C makes the conductive plate 6 clamped with the inclined groove at the opening of the static contact 5 to cooperate in increasing the contact area between the moving contact 4 and the static contact 5. When extinguishing the arc, the driving member 7A drives the transmission rod 78 to move upward. The transmission rod 78 drives the second connecting seat 73 to move upward. The second connecting seat 73 drives the connecting rod 72 to move upward. The connecting rod 72 drives the first connecting seat 71 to move upward. The first connecting seat 71 drives the moving wheel 70 to move upward along the inner wall of the inclined groove on the surface of the static contact 5, thereby causing the conductive plate 6 to move upward.

[0031] The driving member 7A includes a first rack 7D fixedly connected to one end of the transmission rod 78. A transmission gear 7E is meshed with the outer side of the first rack 7D. A support rod 7F is rotatably connected to the center of the transmission gear 7E. Both ends of the support rod 7F are fixedly connected to the inner wall of the arc extinguishing chamber body 1. A second rack 7G is meshed with one side of the transmission gear 7E. The second rack 7G is fixedly connected to the conductive rod 2. When the conductive rod 2 moves upward, the conductive rod 2 drives the second rack 7G to move upward. The second rack 7G drives the transmission gear 7E to rotate. The transmission gear 7E drives the first rack 7D to move downward to cooperate with the downward movement of the conductive plate 6. When arc extinguishing is performed, the corrugated pipe 3 drives the conductive rod 2 to move downward. The conductive rod 2 drives the second rack 7G to move downward. The second rack 7G drives the transmission gear 7E to reverse. The transmission gear 7E drives the first rack 7D to move upward. The upward movement of the first rack 7D drives the transmission rod 78 to move upward to cooperate with pulling the conductive plate 6 to move upward.

[0032] The clamping member 7C includes a clamping block 7H slidably connected to the inner wall of the communication groove 7B. Sliders 7J are respectively fixedly connected to both sides of the clamping block 7H. Slide grooves 7K capable of slidably connecting with the sliders 7J are provided on the inner wall of the communication groove 7B. One end of the clamping block 7H is fixedly connected to a spring piece 7L. One end of the spring piece 7L is fixedly connected to the inner wall of the communication groove 7B. A push block 7M is fixedly connected above one end of the clamping block 7H close to the spring piece 7L. A pushing member 7N capable of pushing the push block 7M to move is provided outside the push block 7M. When the conductive plate 6 moves to the opening of the static contact 5, the pushing member 7N pushes the push block 7M to move. The push block 7M drives the clamping block 7H to slide outward along the communication groove 7B and be clamped with the inclined groove on the surface of the static contact 5. The movement of the clamping block 7H drives the slider 7J to slide along the inner wall of the slide groove 7K and stretch the spring piece 7L. When arc extinguishing is performed, the moving wheel 70 drives the conductive plate 6 to move upward and rotate along the inclined groove on the surface of the static contact 5. The rotation of the conductive plate 6 causes the pushing member 7N not to squeeze the push block 7M anymore. The stretched spring piece 7L contracts and drives the clamping block 7H to slide inward along the inner wall of the communication groove 7B. The clamping block 7H drives the slider 7J to slide along the inner wall of the slide groove 7K to cooperate with releasing the clamping with the inclined groove at the opening of the static contact 5.

[0033] The pushing member 7N includes a push plate 7P slidably connected to the outside of the push block 7M. The push plate 7P is arc-shaped. One end of the push plate 7P is fixedly connected to a support plate 7Q. The support plate 7Q is rotatably connected to the inner wall of the conductive plate 6. The support plate 7Q is connected to the buffer mechanism 8. When working normally, the moving wheel 70 slides downward along the inner wall of the inclined groove on the surface of the static contact 5, thereby driving the conductive plate 6 to move downward while rotating. The rotation of the conductive plate 6 drives the push block 7M to slide along the surface of the push plate 7P, so that the push block 7M drives the clamping block 7H to slide outward along the inner wall of the communication groove 7B, causing the clamping block 7H to slide outward while sliding along the inclined groove on the surface of the static contact 5. When moving to the opening of the static contact 5, the clamping block 7H is completely engaged with the inclined groove at the opening of the static contact 5.

[0034] The buffer mechanism 8 includes a telescopic conductive column 80 located above the conductive plate 6. One end of the telescopic conductive column 80 is fixedly connected to the support plate 7Q, and the other end of the telescopic conductive column 80 is fixedly connected to the inner wall of the static contact 5. The buffer spring 81 is located outside the telescopic conductive column 80, and both ends of the buffer spring 81 are fixedly connected to the inner wall of the static contact 5 and the support plate 7Q respectively. When arc extinguishing is carried out, the conductive plate 6 moves upward, causing the telescopic conductive column 80 to contract and simultaneously compressing the buffer spring 81. The buffer spring 81 buffers the conductive plate 6 when the conductive plate 6 moves upward, preventing the conductive plate 6 from colliding with the surface of the static contact 5. At the same time, the buffer spring 81 can act as an iron core, further increasing the longitudinal magnetic field to relieve the contraction of the arc when interrupting the current, making the arc present a diffusion state, reducing the ablation of the contacts during the arcing process, thereby ensuring the interrupting ability of the vacuum circuit breaker and reducing the consumption of the service life of the moving contact 4 and the static contact 5. Embodiment

[0035] As Figure 9-10 , in the second embodiment, other structures remain unchanged. Different from the first embodiment, the driving member 7A includes a rotating seat one 7R fixedly connected to one end of the transmission rod 78. The first connecting plate 7S is located outside the rotating seat one 7R. A fixed rod 7T is rotatably connected to the center of the first connecting plate 7S. Both ends of the fixed rod 7T are fixedly connected to the inner wall of the arc extinguishing chamber body 1. Compression springs 7U are fixedly connected to the inner walls on both sides of the first connecting plate 7S. One end of each compression spring 7U is fixedly connected to a second connecting plate 7V. The first connecting plate 7S is slidably connected to the second connecting plate 7V. One of the second connecting plates 7V is rotatably connected to the rotating seat one 7R, and the other second connecting plate 7V is rotatably connected to the outside of a rotating seat two 7W. One end of the rotating seat two 7W is fixedly connected to a fixing plate 7X, and the fixing plate 7X is fixedly connected to the conductive rod 2. When the driving member 7A works, the conductive rod 2 drives the fixing plate 7X to move, the fixing plate 7X drives the rotating seat two 7W to move, the rotating seat two 7W drives the second connecting plate 7V to rotate, and while the second connecting plate 7V rotates, the inner wall of the first connecting plate 7S slides and compresses the compression spring 7U. The second connecting plate 7V drives the first connecting plate 7S to rotate along the fixed rod 7T, so that the other end of the first connecting plate 7S drives the second connecting plate 7V to rotate, and the second connecting plate 7V drives the rotating seat one 7R to move in the vertical direction to cooperate with driving the transmission rod 78 to slide on the inner wall of the transmission groove 79.

[0036] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0037] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An arc extinguishing device for a vacuum circuit breaker, comprising an arc extinguishing chamber body (1), a conductive rod (2), a bellows (3), a moving contact (4) and a static contact (5). It is characterized in that: A conductive plate (6) is provided on the inner wall of the static contact (5), and a moving mechanism (7) capable of driving the conductive plate (6) to contact or separate from the moving contact (4) according to the working state is provided outside the conductive plate (6); Above the conductive plate (6), a buffer mechanism (8) capable of buffering the movement of the conductive plate (6) is provided, and the buffer mechanism (8) is connected to the inner wall of the static contact (5); The moving mechanism (7) includes a moving wheel (70) provided outside the conductive plate (6), the moving wheel (70) is connected to the inclined groove on the surface of the static contact (5), a connecting seat one (71) is provided outside the moving wheel (70), a connecting rod (72) is provided outside the connecting seat one (71), a connecting seat two (73) is provided at one end of the connecting rod (72) away from the connecting seat one (71), the connecting seat two (73) is connected to the arc extinguishing chamber body (1), rotating balls (74) are respectively provided at both ends of the connecting rod (72), and rotating grooves (75) capable of rotatably connecting with the rotating balls (74) are provided on the inner walls of the connecting seat one (71) and the connecting seat two (73), a limiting block (76) is provided outside the connecting seat two (73), a limiting groove (77) capable of slidably connecting with the limiting block (76) is provided on the inner wall of the arc extinguishing chamber body (1), a transmission rod (78) is provided at the bottom of the connecting seat two (73), a transmission groove (79) capable of slidably connecting with the transmission rod (78) is provided on the inner wall of the arc extinguishing chamber body (1), a driving member (7A) is provided at one end of the transmission rod (78), a plurality of communication grooves (7B) are provided on the inner wall of the conductive plate (6), and a clamping member (7C) capable of clamping with the inclined grooves at the openings of the moving contact (4) and the static contact (5) is provided on the inner wall of the communication groove (7B); The buffer mechanism (8) includes a telescopic conductive column (80) provided above the conductive plate (6), one end of the telescopic conductive column (80) is connected to a support plate (7Q), the other end of the telescopic conductive column (80) is connected to the inner wall of the static contact (5), a buffer spring (81) is provided outside the telescopic conductive column (80), and both ends of the buffer spring (81) are respectively connected to the inner wall of the static contact (5) and the support plate (7Q); The clamping member (7C) includes a clamping block (7H) provided on the inner wall of the communication groove (7B), sliders (7J) are respectively provided on both sides of the clamping block (7H), a sliding groove (7K) capable of slidably connecting with the sliders (7J) is provided on the inner wall of the communication groove (7B), a spring piece (7L) is provided at one end of the clamping block (7H), one end of the spring piece (7L) is connected to the inner wall of the communication groove (7B), a push block (7M) is provided above one end of the clamping block (7H) close to the spring piece (7L), and a pushing member (7N) capable of pushing the push block (7M) to move is provided outside the push block (7M); The pusher (7N) includes a push plate (7P) arranged outside the push block (7M). One end of the push plate (7P) is provided with a support plate (7Q), and the support plate (7Q) is connected to the buffer mechanism (8). There are two moving wheels (70), and the two moving wheels (70) are spaced 180°.

2. An arc extinguishing device for a vacuum circuit breaker according to claim 1, characterized in that: The driving member (7A) includes a first rack (7D) arranged at one end of the transmission rod (78). A transmission gear (7E) is arranged outside the first rack (7D). A support rod (7F) is arranged at the center of the transmission gear (7E). Both ends of the support rod (7F) are respectively connected to the inner wall of the arc extinguishing chamber body (1). A second rack (7G) is arranged on one side of the transmission gear (7E), and the second rack (7G) is connected to the conductive rod (2).

3. An arc extinguishing device for a vacuum circuit breaker according to claim 1, characterized in that: The number of the communication grooves (7B) corresponds to the inclined grooves on the surface of the static contact (5).

4. An arc extinguishing device for a vacuum circuit breaker according to claim 1, characterized in that: The shape of the push plate (7P) is arc-shaped.

5. An arc extinguishing device for a vacuum circuit breaker according to claim 2, characterized in that: The shape of the transmission rod (78) is L-shaped.

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