A vacuum circuit breaker

Abstract

The application discloses a vacuum circuit breaker and particularly relates to the technical field of circuit breakers, which comprises an insulating shell with a vacuum cavity formed in the inside; a movable conducting rod with one end located in the vacuum cavity and movable along a central axis; a first electromagnet assembly arranged at the outer end of the movable conducting rod and coaxially distributed with the movable conducting rod; and a second electromagnet assembly oppositely arranged with the first electromagnet assembly and having two states of attraction and repulsion between the first electromagnet assembly and the second electromagnet assembly, wherein the second electromagnet assembly is in the state of attraction with the first electromagnet assembly during the opening operation and is in the state of repulsion with the first electromagnet assembly during the closing operation. The suction force and repulsion force provided between the first electromagnet assembly and the second electromagnet assembly in the opening and closing states are opposite to the rebound force, so that the time of repeated rebounding of the movable contact and the static contact during the opening and closing contact separation can be effectively reduced, the time of the rebound arc phenomenon can be reduced, and the service life of the movable contact and the static contact is prolonged.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and more specifically to a vacuum circuit breaker. Background Technology

[0002] Vacuum circuit breakers are named for their high-vacuum nature, which is both the arc-extinguishing medium and the insulating medium between the contacts after arc extinguishing. They are widely used in power distribution networks due to their advantages of small size, light weight, suitability for frequent operation, and maintenance-free arc extinguishing. The vacuum interrupter is the core component of a vacuum circuit breaker, providing the necessary vacuum conditions for extinguishing the arc generated during the opening and closing of the moving and stationary contacts. During the opening and closing operation of a vacuum circuit breaker, the moving conductor rod is moved by the operating mechanism, causing the moving and stationary contacts to close, thus completing the circuit connection. Therefore, the moving and stationary contacts inside are crucial components for opening and closing, and their service life affects the service life of the vacuum interrupter, which in turn affects the service life of the vacuum circuit breaker.

[0003] During the opening and closing process, the moving and stationary contacts engage and separate at relatively high speeds. When the elastic operating mechanism drives the moving conductive rod and the moving contact to contact the stationary contact, a rigid impact occurs. Under the impact, there may be some repeated bouncing. Similarly, when the moving and stationary contacts separate, the elastic reset action of the elastic operating mechanism causes the moving contact to move quickly away from the stationary contact. When it reaches the end position, there will also be an impact rebound, which may also cause repeated bouncing. Repeated bouncing will cause arcing, which will cause the surfaces of the moving and stationary contacts to melt, affecting the performance and reducing the service life. Summary of the Invention

[0004] The purpose of this invention is to provide a vacuum circuit breaker that, through the attraction and repulsion forces provided between the first electromagnet assembly and the second electromagnet assembly in the opening and closing states, which are opposite to the rebound force, can effectively avoid repeated bouncing when the moving contact and stationary contact separate during opening and closing, thereby reducing the phenomenon of bouncing and arcing, and improving the service life of the moving and stationary contacts, so as to solve the above-mentioned shortcomings in the technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a vacuum circuit breaker, comprising:

[0006] An insulating housing has a vacuum cavity inside, with a central axis at the center of the vacuum cavity. A shield is installed inside the vacuum cavity to protect the inner wall of the insulating housing from electric arc damage during opening and closing, effectively extending its service life.

[0007] A movable conductive rod, one end of which is located inside the vacuum cavity and can move along the central axis;

[0008] The first electromagnet assembly is located at the outer end of the moving conductive rod and is coaxially distributed with the moving conductive rod.

[0009] The second electromagnet assembly is arranged opposite to the first electromagnet assembly. There are two states between them: attraction and repulsion. When the circuit is opened, it is in an attraction state with the first electromagnet assembly, and when the circuit is closed, it is in a repulsion state with the first electromagnet assembly.

[0010] A bellows is provided at the connection between the moving conductive rod and the bottom end of the insulating shell. The bellows is used to provide a movable seal at the connection between the moving conductive rod and the bottom end of the insulating shell. The first electromagnet assembly and the second electromagnet assembly are disposed inside the bellows.

[0011] The first electromagnet assembly includes a first electromagnet, a first protective frame, and a first pressure sensor. The first electromagnet is disposed inside the first protective frame, and the first pressure sensor is embedded in the side of the first protective frame that is fixedly connected to the top of the inside of the bellows. The first protective frame is made of insulating material and coated with an antimagnetic coating on the outside.

[0012] The second electromagnet assembly includes a second electromagnet, a second protective frame, and a second pressure sensor. The second electromagnet is disposed inside the second protective frame, and the second pressure sensor is embedded in the side of the second protective frame that is fixedly connected to the bottom of the inner part of the insulating housing. The second protective frame is made of insulating material and coated with an antimagnetic coating on the outside.

[0013] Preferably, a stationary contact and a stationary conductive rod are fixed at one end inside the vacuum cavity. The end of the stationary conductive rod passes through one end of the insulating shell and is connected to the fixing plate and main circuit of the vacuum circuit breaker.

[0014] Preferably, the attraction and repulsion forces between the first electromagnet assembly and the second electromagnet assembly are both located along the axial direction of the moving conductive rod.

[0015] Preferably, the first electromagnet assembly and the second electromagnet assembly switch between attractive and repulsive states by changing the direction of current flow.

[0016] Preferably, the direction of the attraction force of the second electromagnet assembly to the first electromagnet assembly is opposite to the direction of the rebound of the moving conductive rod when the circuit is open, and the direction of its repulsion force is opposite to the direction of the rebound of the moving conductive rod when the circuit is closed.

[0017] Preferably, the moving conductive rod and the bellows are an integrated structure.

[0018] Preferably, the outer end face of the bellows is provided with a spiral guide groove, which is located inside the vacuum cavity and can guide the gas on its outer end face when the bellows contracts and releases.

[0019] Preferably, the movable end of the moving conductive rod is connected to a moving iron core, and a flexible connection is provided between the moving iron core and the moving conductive rod. The flexible connection allows the moving iron core to have a certain radial deviation when driving the moving conductive rod. The end of the moving iron core is connected to the elastic operating structure of the vacuum circuit breaker.

[0020] Preferably, the vacuum chamber is further equipped with a vacuum monitoring unit and a getter unit. The vacuum monitoring unit is used to collect vacuum data in real time. The vacuum monitoring unit includes a miniature vacuum sensor, a control module, and a signal transmission module, which are integrated into one unit. The control module is used to receive and analyze the monitored data, and the signal transmission module is used to transmit the results to the terminal of the external operator. The getter unit starts working based on the monitoring data from the vacuum monitoring unit. The getter unit includes a getter sheet and a miniature heater. The miniature heater is attached to the surface of the getter sheet and has the same specific surface area, which allows it to fully activate the getter sheet.

[0021] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0022] The present invention utilizes the attraction and repulsion forces provided between the first electromagnet assembly and the second electromagnet assembly in the opening and closing states, which are opposite to the rebound force. This can effectively reduce the time of repeated bouncing when the moving contact and stationary contact separate during opening and closing, thereby reducing the time of bouncing and arcing and improving the service life of the moving and stationary contacts.

[0023] Through structural optimizations such as flexible connections and spiral guide channels, damage to core components caused by electric arcs, radial forces, and gas vortices is reduced, the bellows instability failure rate is significantly reduced, the wear of moving contacts is reduced, and the service life of the equipment is improved.

[0024] The vacuum level inside the vacuum chamber is monitored by a vacuum level detection unit, and then monitored and repaired by a getter unit, so that the vacuum level can be maintained within a safe range for a long time, which greatly reduces the operation and maintenance costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0026] Figure 1 This is a three-dimensional structural diagram of the insulating shell of the present invention;

[0027] Figure 2 This is a schematic diagram of the internal structure of the insulating shell of the present invention;

[0028] Figure 3 This is a front view of the interior of the insulating housing of the present invention;

[0029] Figure 4 This is a three-dimensional structural diagram of the getter unit of the present invention;

[0030] Figure 5 This is a three-dimensional structural diagram of the moving conductive rod and bellows of the present invention;

[0031] Figure 6 This is a three-dimensional cross-sectional view of the moving conductive rod and bellows of the present invention.

[0032] Figure 7 This is a three-dimensional structural diagram of the opening and closing auxiliary mechanism of the present invention;

[0033] Figure 8 This is a three-dimensional structural diagram of the moving iron core and flexible connection part of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Insulating shell; 110. Vacuum cavity; 120. Shielding cover;

[0036] 200. Stationary contact;

[0037] 300. Moving contact; 310. Moving conductive rod; 320. Bellows; 321. Spiral guide groove; 330. Moving iron core; 340. Flexible connection part;

[0038] 400. Auxiliary mechanism for opening and closing the circuit breaker; 410. First electromagnet assembly; 411. First electromagnet; 412. First protective frame; 413. First pressure sensor; 420. Second electromagnet assembly; 421. Second electromagnet; 422. Second protective frame; 423. Second pressure sensor;

[0039] 500. Vacuum monitoring unit;

[0040] 600, Getter Unit; 610, Getter Sheet; 620, Miniature Heater. Detailed Implementation

[0041] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In existing vacuum circuit breakers, the moving and stationary contacts operate at relatively high speeds during frequent opening and closing. When the flexible operating mechanism drives the moving conductive rod and the moving contact to contact the stationary contact, a rigid impact occurs, which may result in repeated bouncing. Similarly, when the moving and stationary contacts separate, the elastic reset action of the flexible operating mechanism causes the moving contact to move rapidly away from the stationary contact. When it reaches the end position, an impact rebound may also occur, which may result in repeated bouncing. Repeated bouncing can cause arcing, which can lead to melting of the surfaces of the moving and stationary contacts, affecting performance and reducing lifespan.

[0043] To solve the above-mentioned technical problems, the present invention discloses a vacuum circuit breaker, such as... Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, it includes: an insulating shell 100, which has a vacuum cavity 110 inside. The vacuum cavity 110 has a central axis at its center, and the opening and closing directions of the stationary contact and the moving contact are both on the central axis.

[0044] The movable conductive rod 310 has one end located inside the vacuum cavity 110 and can move along the central axis;

[0045] The first electromagnet assembly 410 is disposed at the outer end of the movable conductive rod 310 and is coaxially distributed with the movable conductive rod 310.

[0046] The second electromagnet assembly 420 is arranged opposite to the first electromagnet assembly 410. There are two states between them: attraction and repulsion. When the circuit is opened, it is in the attraction state with the first electromagnet assembly 410. When the circuit is closed, it is in the repulsion state with the first electromagnet assembly 410.

[0047] like Figure 2 and Figure 6As shown, the insulating shell 100 is made of high-strength alumina ceramic material, and a vacuum cavity 110 is provided inside. The moving conductive rod 310 inside the vacuum cavity 110 can drive the moving contact 300 at its end to move up and down, thereby opening and closing the circuit with the stationary contact 200 above it. When opening the circuit, the moving conductive rod 310 drives the moving contact 300 to move downward. At this time, the first electromagnet assembly 410 and the second electromagnet assembly 420 are attracted to each other. When the moving conductive rod 310 bounces back, the attraction force can cancel out the rebound force, thereby reducing the time of repeated bouncing. Similarly, when closing the circuit, the moving conductive rod 310 drives the moving contact 300 to move upward. When the moving contact 300 contacts the stationary contact 200 and bounces back, the repulsive force cancels out the rebound force, and the repulsive force applies a force to the moving contact 300 to adhere to the stationary contact 200, which can prevent them from separating due to vibration. By using the attraction and repulsion forces provided by the first electromagnet assembly 410 and the second electromagnet assembly 420 in the opening and closing states, which are opposite to the rebound force, the time of repeated bouncing when the moving contact 300 and the stationary contact 200 are separated during opening and closing can be effectively reduced, thereby reducing the time of bouncing and arcing and improving the service life of the moving and stationary contacts.

[0048] The above structure defines the core structural framework, but in actual implementation, there are still potential issues due to unclear details. Therefore, the above embodiment is further optimized as follows:

[0049] The attraction and repulsion forces between the first electromagnet assembly 410 and the second electromagnet assembly 420 are both located along the axis of the moving conductive rod 310. The attraction force of the second electromagnet assembly 420 on the first electromagnet assembly 410 is opposite to the rebound direction of the moving conductive rod 310 when the circuit is opened, and its repulsion force is opposite to the rebound direction of the moving conductive rod 310 when the circuit is closed. In this way, when the moving conductive rod 310 performs the opening and closing action, the directions of the attraction and repulsion forces are the same as its action direction and the directions of the forces are opposite, which can better counteract the rebound force.

[0050] In one embodiment, such as Figure 6 and Figure 7As shown, the first electromagnet assembly 410 includes a first electromagnet 411, a first protective frame 412, and a first pressure sensor 413. The first electromagnet 411 is disposed inside the first protective frame 412, and the first pressure sensor 413 is embedded in the side of the first protective frame 412 that is fixedly connected to the top of the inside of the bellows 320. The first protective frame 412 is made of insulating material and coated with an antimagnetic coating. The second electromagnet assembly 420 includes a second electromagnet 421, a second protective frame 422, and a second pressure sensor 423. The second electromagnet 421 is disposed inside the second protective frame 422, and the second pressure sensor 423 is embedded in the side of the second protective frame 422 that is fixedly connected to the bottom of the inside of the insulating housing 100. The second protective frame 422 is made of insulating material and coated with an antimagnetic coating. The first protective frame 412, the second protective frame 422, and their external antimagnetic coatings can isolate current and external magnetic influences.

[0051] The electromagnet has a coil wound around its outer end. The direction of the current in the coil can be changed, which changes the direction of the magnetic poles. This allows the first electromagnet assembly 410 and the second electromagnet assembly 420 to switch between attractive and repulsive states. The current is controlled by an external controller, which is existing technology. The controller changes the current direction based on the opening and closing signals, thereby changing the attraction and repulsion states between the two electromagnet assemblies. The magnitude of the force between the two electromagnet assemblies is determined experimentally. First, two electromagnet assemblies are selected, and the distance between them is set to the distance between the two electromagnet assemblies in this application. The magnitude of the magnetic force between the two electromagnet assemblies is changed by adjusting the current. Then, the action of the moving conductive rod 310 driving the moving contact 300 to separate from the stationary contact 200 is simulated in the opening and closing state. At this time, the force between the two electromagnet assemblies will buffer the rebound force. The magnitude of the buffered attraction and repulsion forces is changed by gradually changing the current. Then, the moving and stationary contacts are detected. The repeated bounce time during contact separation and engagement is minimized until the bounce time is reduced to a minimum. At this point, the optimal buffering force can be determined, and the optimal attraction and repulsion force data can be obtained. Then, the optimal attraction and repulsion force data are input into the existing controller. The two pressure sensors are existing technologies. The first pressure sensor 413 is a strain gauge pressure sensor, which can measure the tension when two electromagnets attract each other. The second pressure sensor 423 is a capacitive pressure sensor, which can measure the pressure when two electromagnets repel each other. Both types of sensors are available on the market. The sensor wiring can be passed through the non-sealed vacuum section at the bottom of the insulating housing 100 and connected to the external controller. It can measure the magnetic force between the two electromagnets and transmit the data to the controller. The controller can adjust the current in real time according to the optimal force data and measurement data, so that the attraction and repulsion forces are always kept in the optimal state, thereby better buffering and canceling the rebound force, and the force can always remain stable.

[0052] When the moving conductive rod moves, in order to maintain the vacuum level inside the vacuum chamber 110, it is necessary to ensure that its moving parts are sealed, such as... Figure 2 , Figure 3 and Figure 6 As shown, a bellows 320 is fixedly provided at the outer end of the moving conductive rod 310. The moving conductive rod 310 and the bellows 320 are an integrated structure. This integrated structure is integrally formed using titanium-nickel shape memory alloy and prepared by a composite process of hot pressing and vacuum heat treatment. The titanium-nickel shape memory alloy has small deformation under the impact of opening and closing, and fast buffer recovery time, which can realize the dual functions of sealing and buffering. The integrated structure eliminates the assembly gap of the traditional split connection, avoids the risk of air leakage from the root, effectively improves the sealing reliability and buffering performance of the moving contact component, avoids component fatigue damage caused by the impact of opening and closing, and extends the service life of the core component. The bottom end of the bellows 320 is sealed and welded to the bottom end of the inner part of the insulating shell 100. The bottom end of the moving conductive rod 310 passes through the middle of the bottom end of the insulating shell 100 and is axially slidably connected to it. The first electromagnet assembly 410 and the second electromagnet assembly 420 are arranged inside the bellows. The first electromagnet assembly 410 can move synchronously with the integrated connection end of the bellows 320 and the moving conductive rod 310.

[0053] like Figure 5 As shown, a spiral guide groove 321 with a spiral angle of 45° is formed on the outer end face of the bellows 320, and is evenly distributed spirally along the outer wall. The spiral guide groove 321 is prepared by a process of "first forming the corrugations and then laser engraving the shape"; the 45° spiral angle can guide the orderly flow of gas in the vacuum cavity 110 and avoid the generation of eddies at the crests and troughs. It reduces the gas flow resistance and avoids axial instability and radial displacement of the bellows 320 during high-frequency vibration or large stroke expansion and contraction.

[0054] like Figure 8 As shown, the movable end of the moving conductive rod 310 is connected to a moving iron core 330. A flexible connection part 340 is provided between the moving iron core 330 and the moving conductive rod 310. The flexible connection part 340 allows for a certain radial deviation when the moving iron core 330 drives the moving conductive rod 310. The flexible connection part 340 adopts a universal joint type elastic structure, and its body is made of carbon fiber reinforced epoxy resin composite material. The radial elastic deformation is ≤0.2mm, and a 0.5° angular deviation is allowed. The carbon fiber reinforced composite material has both high axial stiffness and good radial elasticity. The universal joint type structure can absorb radial offset through elastic deformation; the allowable 0.5° angular deviation can eliminate the radial force caused by the coaxiality deviation of the moving iron core 330 during movement. This avoids the problems of uneven wear of the moving contact and fatigue damage of the bellows caused by the misalignment of the moving conductive rod 310 and the moving iron core 330 during transmission.

[0055] To better protect the insulating housing 100, such as Figure 2 and Figure 3 As shown, the present invention also includes a shielding cover 120 inside the vacuum chamber 110. The shielding cover 120 is located inside the vacuum chamber 110 and surrounds the outside of the stationary contact 200 and the moving contact 300. The shielding cover 120 is made of copper alloy and its surface is passivated. It can block arc radiation and metal vapor diffusion, and prevent the arc from directly bombarding the inner wall of the insulating shell 100, which would cause insulation aging.

[0056] In a vacuum circuit breaker, besides the moving and stationary contacts being crucial, maintaining a certain vacuum level in the vacuum interrupter is equally important. To extend the overall lifespan of the vacuum interrupter, such as... Figure 2 and Figure 3 As shown, the present invention also includes a vacuum monitoring unit 500 and a getter unit 600 inside the vacuum chamber 110. The vacuum monitoring unit 500 is used to collect vacuum data in real time. The vacuum monitoring unit 500 includes a miniature vacuum sensor, a control module, and a signal transmission module, which are integrated into one unit. The miniature vacuum sensor transmits the monitoring data to the control module, which determines whether to activate the getter unit 600 based on the data. Simultaneously, the signal transmission module transmits the data to an external controller. The miniature vacuum sensor is a magnetron discharge type with a measurement range of 10. -10 Pa-10 -2 Pa, accuracy ±5%, conforming to IEC 62271 international standard, capable of accurately acquiring vacuum data; control module pre-stores 10 -4 The repair threshold of Pa is used to control the operation of the getter unit 600 based on the comparison between data and the threshold. The signal transmission module adopts wireless transmission to feed the data back to the external controller in real time, facilitating remote monitoring by staff. This avoids the lag and misjudgment that can occur with manual monitoring, realizing vacuum monitoring and automatic repair, and improving the convenience of equipment operation and maintenance. The getter unit 600 is located around the contact connection during opening and closing and absorbs the metal vapor generated during opening and closing. It can actively adsorb trace gases in the vacuum chamber 110, including residual gases and metal vapor generated during the opening and closing of the moving and stationary contacts, such as... Figure 4 As shown, the getter unit 600 includes a getter sheet 610 and a micro heater 620. The getter sheet 610 is made of zirconium-aluminum alloy and is fixed to the inner wall of the shield 120. The getter sheet 610 has a sheet-like structure and is evenly distributed inside the vacuum chamber 110. The micro heater 620 is a flexible thin-film heater with a heating power of 5-10W, an activation temperature of 200-300℃, and an activation time of 30-60s. It is electrically connected to the control module. This ensures the full activation of the getter, improves the effectiveness and stability of vacuum restoration, and extends the service life of the getter.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0058] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A vacuum circuit breaker, characterized in that, include: An insulating shell (100) has a vacuum cavity (110) inside, and the vacuum cavity (110) has a central axis at its center; A movable conductive rod (310) has one end located inside the vacuum cavity (110) and can move along the central axis; The first electromagnet assembly (410) is disposed at the outer end of the moving conductive rod (310) and is coaxially distributed with the moving conductive rod (310); The second electromagnet assembly (420) is arranged opposite to the first electromagnet assembly (410). There are two states between it and the first electromagnet assembly (410): attraction and repulsion. When the circuit is opened, it is in the attraction state with the first electromagnet assembly (410). When the circuit is closed, it is in the repulsion state with the first electromagnet assembly (410). A bellows (320) is provided at the connection between the moving conductive rod (310) and the bottom end of the insulating shell (100). The bellows (320) is used to provide a movable seal at the connection between the moving conductive rod (310) and the bottom end of the insulating shell (100). The first electromagnet assembly (410) and the second electromagnet assembly (420) are disposed inside the bellows. The first electromagnet assembly (410) includes a first electromagnet (411), a first protective frame (412), and a first pressure sensor (413). The first electromagnet (411) is disposed inside the first protective frame (412), and the first pressure sensor (413) is embedded in the side of the first protective frame (412) that is fixedly connected to the top of the inside of the bellows (320). The first protective frame (412) is made of insulating material and coated with an antimagnetic coating on the outside. The second electromagnet assembly (420) includes a second electromagnet (421), a second protective frame (422), and a second pressure sensor (423). The second electromagnet (421) is disposed inside the second protective frame (422), and the second pressure sensor (423) is embedded in the side of the second protective frame (422) that is fixedly connected to the bottom of the inner side of the insulating housing (100). The second protective frame (422) is made of insulating material and coated with an antimagnetic coating on the outside.

2. The vacuum circuit breaker according to claim 1, characterized in that: The attraction and repulsion forces between the first electromagnet assembly (410) and the second electromagnet assembly (420) are both located in the axial direction of the moving conductive rod (310).

3. The vacuum circuit breaker according to claim 1, characterized in that: The first electromagnet assembly (410) and the second electromagnet assembly (420) switch between attraction and repulsion states by changing the direction of current flow.

4. The vacuum circuit breaker according to claim 1, characterized in that: The direction of the attraction force of the second electromagnet assembly (420) to the first electromagnet assembly (410) is opposite to the direction of the rebound of the moving conductive rod (310) when the circuit is open, and the direction of its repulsion force is opposite to the direction of the rebound of the moving conductive rod (310) when the circuit is closed.

5. The vacuum circuit breaker according to claim 1, characterized in that: The moving conductive rod (310) and the bellows (320) are an integrated structure.

6. The vacuum circuit breaker according to claim 1, characterized in that: The outer end face of the bellows (320) is provided with a spiral guide groove (321). The spiral guide groove (321) is located inside the vacuum cavity (110) and can guide the gas on its outer end face when the bellows (320) contracts and releases.

7. The vacuum circuit breaker according to claim 1, characterized in that: The movable end of the movable conductive rod (310) is connected to a movable iron core (330). A flexible connection part (340) is provided between the movable iron core (330) and the movable conductive rod (310). The flexible connection part (340) allows the movable iron core (330) to have a certain radial deviation when it drives the movable conductive rod (310) to move.

8. The vacuum circuit breaker according to claim 1, characterized in that: The vacuum chamber (110) is also equipped with a vacuum degree monitoring unit (500) and a getter unit (600). The vacuum degree monitoring unit (500) is used to collect vacuum degree data in real time, and the getter unit (600) starts working based on the monitoring data of the vacuum degree monitoring unit (500).

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