Vacuum circuit breaker

Abstract

The invention relates to a vacuum circuit breaker which comprises a vacuum arc-extinguishing chamber, a contact mechanism and a brake mechanism, the contact mechanism comprises a static contact and a moving contact which are oppositely arranged, the static contact is fixedly arranged in the vacuum arc-extinguishing chamber, and the moving contact can be movably arranged in the vacuum arc-extinguishing chamber in the direction close to or away from the static contact. The contact mechanism further comprises an operating rod and a permanent magnet, the operating rod is arranged at one end, far away from the static contact, of the moving contact, and the permanent magnet is arranged on the operating rod; the brake mechanism comprises a fixedly arranged buffer coil, and the buffer coil is arranged between the moving contact and the permanent magnet. By arranging the buffer coil and the permanent magnet, when the moving contact moves in the direction close to the static contact, the buffer coil generates repulsive force on the permanent magnet, so that the moving contact slowly slows down in the closing process, and when the moving contact makes contact with the static contact, the impact force of the moving contact on the static contact is small; therefore, the moving contact can be prevented from rebounding, the performance of the vacuum circuit breaker is ensured, and the service life of the vacuum arc-extinguishing chamber is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of power supply equipment, and in particular to a vacuum circuit breaker. Background Art

[0002] A vacuum circuit breaker is a high-voltage switchgear specially used to disconnect and connect current in power systems. It uses the insulation characteristics in a vacuum state to achieve the function of opening or closing the circuit. It has high breaking capacity, fast switching speed, good insulation performance and reliable operating characteristics. It is often used in the protection and control of high-voltage transmission lines, substations and power equipment in power systems.

[0003] During the closing process of the vacuum circuit breaker in the related art, the moving contact and the static contact may collide with each other in rigid contact, which may cause the moving contact to rebound and close again. This phenomenon is called the closing bounce of the circuit breaker. If the closing bounce lasts too long, it will seriously affect the performance of the vacuum circuit breaker. In addition, since the moving contact may easily generate an arc during the closing bounce, the electrical wear of the moving contact will increase, which will greatly reduce the service life of the vacuum interrupter. The arc generated by the closing bounce will also cause the moving contact to weld. At the same time, the multiple bounces of the moving contact during the closing process of the vacuum circuit breaker will also cause the fracture to reignite and cut off. Especially when the inductive load is put into operation, the circuit will generate high-frequency electromagnetic oscillations and overvoltage, causing damage to the vacuum circuit breaker and the equipment connected to it. Summary of the invention

[0004] Based on this, it is necessary to provide a vacuum circuit breaker that can prevent the moving contact from rebounding, ensure the performance of the vacuum circuit breaker, increase the service life of the vacuum arc chamber, and improve the safety of use.

[0005] A vacuum circuit breaker, comprising:

[0006] Vacuum interrupter;

[0007] A contact mechanism, the contact mechanism comprising a stationary contact and a moving contact arranged opposite to each other, the stationary contact being fixedly arranged in the vacuum interrupter, and the moving contact being movable in the vacuum interrupter in a direction approaching or moving away from the stationary contact; the contact mechanism further comprising an operating rod and a permanent magnet, the operating rod being arranged at an end of the moving contact away from the stationary contact, and the permanent magnet being arranged on the operating rod;

[0008] The braking mechanism includes a fixed buffer coil, the buffer coil is arranged between the moving contact and the permanent magnet, and the buffer coil is configured to generate a repulsive force on the permanent magnet during the closing process to slow down the moving contact.

[0009] The braking mechanism comprises a fixed buffer coil, wherein the buffer coil is arranged between the moving contact and the permanent magnet; when the switch is closed, the buffer coil is configured to generate a repulsive force on the permanent magnet so as to slowly decelerate the moving contact.

[0010] In the above scheme, by arranging a buffer coil and a permanent magnet on the operating rod, when the moving contact moves in the direction close to the static contact, the buffer coil generates a repulsive force on the permanent magnet, so that the moving contact slowly decelerates during the closing process, and then when the moving contact contacts the static contact, the impact force of the moving contact on the static contact is smaller, thereby preventing the moving contact from rebounding, ensuring the performance of the vacuum circuit breaker, increasing the service life of the vacuum arc chamber, and improving the safety of use.

[0011] In one of the embodiments, a first through hole is formed on the buffer coil for the permanent magnet to pass through.

[0012] The position of the buffer coil needs to be set according to the closing buffer effect requirements. The discharge current of the buffer coil can be provided by an external pre-charged capacitor group, and the winding direction of the buffer coil needs to ensure that the direction of the magnetic flux generated by the discharge current passing through it is opposite to the direction of the magnetic flux of the permanent magnet in the closing position, so that the buffer coil produces a repulsive force on the permanent magnet.

[0013] In one embodiment, the braking mechanism also includes a shell, the buffer coil is located inside the shell and fixedly arranged on the top inner side of the shell, a penetrating mounting hole is opened on the shell, the operating rod is passed through the mounting hole, and the permanent magnet is located inside the shell.

[0014] In one embodiment, the braking mechanism also includes a first buffer member and a second buffer member arranged inside the shell, the first buffer member and the second buffer member are arranged at an interval, and the permanent magnet and the buffer coil are located between the first buffer member and the second buffer member, and the permanent magnet can abut against the first buffer member and the second buffer member.

[0015] In one embodiment, the inner diameter of the first through hole is larger than the outer diameters of the first buffer component and the second buffer component.

[0016] In one embodiment, the shell includes a first side wall and a second side wall that are arranged opposite to each other, the mounting hole includes a second through hole opened on the first side wall and a third through hole opened on the second side wall, the operating rod is passed through the second through hole and the third through hole, the first buffer member is arranged on the inner edge of the second through hole, and the second buffer member is arranged on the inner edge of the third through hole.

[0017] In one embodiment, the permanent magnet can be adsorbed on the first side wall or the second side wall to maintain the moving contact in the closed position or the open position;

[0018] And / or, the operating rod, the buffer coil, the permanent magnet, the second through hole, the third through hole, the first buffer component and the second buffer component are all coaxially arranged.

[0019] In one of the embodiments, in the closed position or the open position, the buffer coil does not generate magnetic force on the permanent magnet.

[0020] In one of the embodiments, the shell is made of magnetic conductive material.

[0021] In one of the embodiments, an insulating rod is further provided between the end of the moving contact away from the static contact and the operating rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of a vacuum circuit breaker shown in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 10. Vacuum circuit breaker; 100. Vacuum interrupter; 200. Contact mechanism; 210. Stationary contact; 220. Moving contact; 230. Conductive rod; 240. Operating rod; 250. Permanent magnet; 300. Braking mechanism; 310. Buffer coil; 320. Shell; 321. First side wall; 322. Second side wall; 330. First buffer member; 340. Second buffer member; 400. Insulating rod; 500. Shell; 600. Bellows. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0028] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0029] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0031] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0033] A vacuum circuit breaker is a high-voltage switchgear specially used to disconnect and connect current in power systems. It uses the insulation characteristics in a vacuum state to achieve the function of opening or closing the circuit. It has high breaking capacity, fast switching speed, good insulation performance and reliable operating characteristics. It is often used in the protection and control of high-voltage transmission lines, substations and power equipment in power systems.

[0034] During the closing process of the vacuum circuit breaker in the related technology, the moving contact is prone to rebound and close again due to the rigid contact and collision between the moving contact and the static contact. This phenomenon is called the closing bounce of the circuit breaker. If the closing bounce lasts too long, it will seriously affect the performance of the vacuum circuit breaker. In addition, since the moving contact is prone to generate arcs when it bounces open during the closing bounce, the electrical wear of the moving contact will increase and the service life of the vacuum interrupter will be greatly reduced. The arc generated by the closing bounce will also cause the moving contact to weld. At the same time, the multiple bounces of the moving contact during the closing process of the vacuum circuit breaker will also cause the break to reignite, cut off the current, etc. In particular, when the inductive load is put into use, the circuit will generate high-frequency electromagnetic oscillations and overvoltage, causing damage to the vacuum circuit breaker and the equipment connected to it.

[0035] Therefore, how to effectively reduce or even eliminate the closing bounce of circuit breakers is particularly important, especially in the context of the development of vacuum circuit breakers towards high voltage levels. The structures such as the thickened moving contact conductive rod due to the need for heat dissipation in the vacuum interrupter will significantly increase the mass of the closing moving parts. In addition, in order to reduce the pre-breakdown arc time caused by the pre-breakdown before the moving contact and the static contact contact during the closing process, the closing speed of vacuum circuit breakers with high voltage levels is faster. Therefore, the closing bounce cannot be reduced simply by reducing the overall closing speed, which will seriously aggravate the occurrence of closing bounce.

[0036] To solve the above problems, see Figure 1 An embodiment of the present application relates to a vacuum circuit breaker 10, including a vacuum interrupter 100, a contact mechanism 200 and a brake mechanism 300, wherein the contact mechanism 200 is disposed in the vacuum interrupter 100, and the brake mechanism 300 acts on the contact mechanism 200.

[0037] The contact mechanism 200 includes a stationary contact 210 and a moving contact 220 which are arranged opposite to each other. The stationary contact 210 is fixedly arranged in the vacuum interrupter 100, and the moving contact 220 can be movably arranged in the vacuum interrupter 100 in a direction close to or away from the stationary contact 210. When the moving contact 220 moves in a direction close to the stationary contact 210 until it contacts the stationary contact 210, the circuit breaker can be closed. When the moving contact 220 moves in a direction away from the stationary contact 210 until it separates from the stationary contact 210, the circuit breaker can be opened.

[0038] See also Figure 1 The contact mechanism 200 further includes an operating rod 240 and a permanent magnet 250. The operating rod 240 is disposed at one end of the moving contact 220 away from the stationary contact 210, and the permanent magnet 250 is disposed on the operating rod 240. Specifically, a conductive rod 230 is disposed at one end of the stationary contact 210 away from the moving contact 220 and one end of the moving contact 220 away from the stationary contact 210. The stationary contact 210 is fixedly disposed on the inner side of the top of the vacuum interrupter 100 through the conductive rod 230 connected thereto. A sliding hole is provided at the bottom of the vacuum interrupter 100, and the moving contact 220 is slidably connected in the sliding hole through the conductive rod 230 connected thereto, and the conductive rod 230 connected to the moving contact 220 is extended out of the vacuum interrupter 100.

[0039] A bellows 600 is also provided in the vacuum interrupter 100 , one end of the bellows 600 is sealed and welded to the side wall of the conductive rod 230 connected to the moving contact 220 , and the other end of the bellows 600 is sealed and welded to the bottom inner wall of the vacuum interrupter 100 .

[0040] More specifically, the moving contact 220 is disposed directly below the stationary contact 210. The permanent magnet 250 is sleeved on the operating rod 240. The polarities of the end of the permanent magnet 250 close to the moving contact 220 and the end of the permanent magnet 250 away from the moving contact 220 are different. Exemplarily, the end of the permanent magnet 250 close to the moving contact 220 is an N pole, and the end of the permanent magnet 250 away from the moving contact 220 is an S pole.

[0041] It should be noted that the fixing method of the static contact 210 to the vacuum interrupter 100 is not limited in this application. Exemplarily, the fixing method of the static contact 210 to the vacuum interrupter 100 is bonding, welding, riveting or bolting. The permanent magnet 250 can be fixedly connected to the operating rod 240, and the fixing method of the permanent magnet 250 to the operating rod 240 is not limited in this application. Exemplarily, the fixing method of the permanent magnet 250 to the operating rod 240 is bonding or welding. The permanent magnet 250 is detachably connected to the operating rod 240, and exemplarily, the connection method of the permanent magnet 250 to the operating rod 240 is threaded connection or nesting.

[0042] See also Figure 1 The brake mechanism 300 includes a fixed buffer coil 310, which is disposed between the moving contact 220 and the permanent magnet 250. When the switch is closed, the buffer coil 310 is configured to generate a repulsive force on the permanent magnet 250 to slowly decelerate the moving contact 220. Specifically, the permanent magnet 250 is disposed below the buffer coil 310. When the switch is closed, the permanent magnet 250 moves in a direction close to the buffer coil 310.

[0043] By setting the buffer coil 310 and the permanent magnet 250 on the operating rod 240, when the moving contact 220 moves in the direction close to the static contact 210, the buffer coil 310 generates a repulsive force on the permanent magnet 250, so that the moving contact 220 slowly decelerates during the closing process, and further when the moving contact 220 contacts the static contact 210, the impact force of the moving contact 220 on the static contact 210 is smaller, thereby preventing the moving contact 220 from rebounding, ensuring the performance of the vacuum circuit breaker 10, improving the service life of the vacuum interrupter 100, and improving the safety of use.

[0044] See also Figure 1 According to some embodiments of the present application, optionally, a first through hole for the permanent magnet 250 to pass through is opened on the buffer coil 310, and the permanent magnet 250 and the operating rod 240 are slidably connected to the first through hole. Specifically, the operating rod 240 adopts a cylindrical structure, and the permanent magnet 250 and the buffer coil 310 both adopt an annular structure. The inner diameter of the first through hole is larger than the outer diameter of the permanent magnet 250, ensuring that the permanent magnet 250 can pass smoothly.

[0045] It should be noted that the position of the buffer coil 310 needs to be set according to the closing buffer effect requirements. The discharge current of the buffer coil 310 can be provided by an external pre-charged capacitor bank, and the winding direction of the buffer coil 310 needs to ensure that the direction of the magnetic flux generated by the discharge current passing through it is opposite to the direction of the magnetic flux of the permanent magnet 250 in the closing position, so that the buffer coil 310 generates a repulsive force on the permanent magnet 250.

[0046] The discharge time of the buffer coil 310 starts when the permanent magnet 250 approaches the bottom of the buffer coil 310, and ends when the end face of the permanent magnet 250 away from the buffer coil 310 reaches the radial center plane of the buffer coil 310. It should be noted that: the present application does not limit the discharge current amplitude, discharge time and magnetic field strength of the buffer coil 310, and the discharge current amplitude, discharge time and magnetic field strength of the buffer coil 310 are set according to the closing buffer effect requirements.

[0047] See also Figure 1 According to some embodiments of the present application, optionally, the brake mechanism 300 further includes a housing 320, the buffer coil 310 is located inside the housing 320, and is fixedly arranged on the top inner side of the housing 320, the housing 320 is provided with a through mounting hole, the operating rod 240 is passed through the mounting hole, and the permanent magnet 250 is located inside the housing 320. Specifically, the operating rod 240 is slidably connected in the mounting hole. The inner diameter of the mounting hole is larger than the outer diameter of the operating rod 240.

[0048] It should be noted that the application does not limit the fixing method of the buffer coil 310 to the top inner side of the housing 320. Exemplarily, the fixing method of the buffer coil 310 to the top inner side of the housing 320 is bonding, welding, riveting or bolting.

[0049] See also Figure 1 According to some embodiments of the present application, optionally, the brake mechanism 300 further includes a first buffer 330 and a second buffer 340 disposed inside the housing 320, the first buffer 330 and the second buffer 340 are spaced apart, and the permanent magnet 250 and the buffer coil 310 are located between the first buffer 330 and the second buffer 340, and the permanent magnet 250 can abut against the first buffer 330 and the second buffer 340. Specifically, the first buffer 330 and the second buffer 340 are both made of elastic material. Exemplarily, the first buffer 330 and the second buffer 340 are both made of silicone.

[0050] Specifically, the first buffer 330 is located above the permanent magnet 250, and the second buffer 340 is located below the permanent magnet 250. When the moving contact 220 moves to a position close to the closing position, the permanent magnet 250 can collide with the first buffer 330, and the first buffer 330 can absorb the impact energy of the permanent magnet 250, thereby further reducing the closing impact. When the moving contact 220 moves to a position close to the opening position, the permanent magnet 250 can collide with the second buffer 340, and the second buffer 340 can absorb the impact energy of the permanent magnet 250, thereby protecting the permanent magnet 250 and preventing the permanent magnet 250 from being damaged.

[0051] See also Figure 1 According to some embodiments of the present application, optionally, the inner diameter of the first through-hole is larger than the outer diameters of the first buffer member 330 and the second buffer member 340 , so that the permanent magnet 250 can pass through the first through-hole and abut against the first buffer member 330 .

[0052] See also Figure 1 According to some embodiments of the present application, optionally, the housing 320 includes a first side wall 321 and a second side wall 322 that are oppositely disposed, the mounting hole includes a second through hole opened on the first side wall 321 and a third through hole opened on the second side wall 322, and the operating rod 240 is passed through the second through hole and the third through hole. The first buffer 330 is disposed on the inner edge of the second through hole, and the second buffer 340 is disposed on the inner edge of the third through hole.

[0053] Specifically, the first buffer 330 is fixedly connected to the inner edge of the second perforation, and the second buffer 340 is fixedly connected to the inner edge of the third perforation. The first buffer 330 and the second buffer 340 are both annular mechanisms. It should be noted that the fixing method of the first buffer 330 fixedly connected to the inner edge of the second perforation and the second buffer 340 fixedly connected to the inner edge of the third perforation is not limited in this application. Exemplarily, the fixing method of the first buffer 330 fixedly connected to the inner edge of the second perforation and the second buffer 340 fixedly connected to the inner edge of the third perforation is bonding, welding, riveting or bolting.

[0054] See also Figure 1 According to some embodiments of the present application, optionally, the permanent magnet 250 can be adsorbed on the first side wall 321 or the second side wall 322 to maintain the moving contact 220 in the closed position or the open position. Specifically, the material used for the housing 320 is a magnetic conductive material. Exemplarily, the material used for the housing 320 is iron.

[0055] When the permanent magnet 250 is adsorbed on the first side wall 321, the moving contact 220 is maintained in the closed position. When the permanent magnet 250 is adsorbed on the second side wall 322, the moving contact 220 is maintained in the open position. Specifically, the permanent magnet 250 can be adsorbed on the first side wall 321 through the first buffer 330. The permanent magnet 250 can be adsorbed on the second side wall 322 through the second buffer 340.

[0056] See also Figure 1 According to some embodiments of the present application, optionally, in the closing position or the opening position, the buffer coil 310 is configured to not generate magnetic force on the permanent magnet 250. Specifically, when the end surface of the permanent magnet 250 away from the buffer coil 310 reaches the radial center plane of the buffer coil 310, the buffer coil 310 stops discharging, so that the buffer coil 310 does not generate magnetic force on the permanent magnet 250, so that the moving contact 220 can be maintained in the closing position.

[0057] See also Figure 1 According to some embodiments of the present application, optionally, an insulating rod 400 is further provided between the end of the moving contact 220 away from the static contact 210 and the operating rod 240. The insulating rod 400, the operating rod 240, the buffer coil 310, the permanent magnet 250, the second through hole, the third through hole, the first buffer member 330 and the second buffer member 340 are all coaxially arranged. Specifically, the insulating rod 400 is fixedly connected to the end of the operating rod 240 away from the moving contact 220.

[0058] It should be noted that the present application does not limit the manner in which the insulating rod 400 is fixedly connected to the moving contact 220. Exemplarily, the manner in which the insulating rod 400 is fixedly connected to the moving contact 220 is bonding, welding, riveting or bolting.

[0059] See also Figure 1 According to some embodiments of the present application, optionally, the vacuum circuit breaker 10 further includes a housing 500 , and the vacuum interrupter 100 and the braking mechanism 300 are both disposed inside the housing 500 .

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A vacuum circuit breaker, characterized in that: include: Vacuum interrupter; A contact mechanism, the contact mechanism comprising a stationary contact and a moving contact arranged opposite to each other, the stationary contact being fixedly arranged in the vacuum interrupter, and the moving contact being movable in the vacuum interrupter in a direction approaching or moving away from the stationary contact; the contact mechanism further comprising an operating rod and a permanent magnet, the operating rod being arranged at an end of the moving contact away from the stationary contact, and the permanent magnet being arranged on the operating rod; The braking mechanism includes a fixed buffer coil, the buffer coil is arranged between the moving contact and the permanent magnet, and the buffer coil is configured to generate a repulsive force on the permanent magnet during the closing process to slow down the moving contact.

2. The vacuum circuit breaker according to claim 1, characterized in that: The buffer coil is provided with a first through hole for the permanent magnet to pass through.

3. The vacuum circuit breaker according to claim 2, characterized in that: The braking mechanism also includes a shell, the buffer coil is located inside the shell and fixedly arranged on the top inner side of the shell, a penetrating mounting hole is opened on the shell, the operating rod is inserted into the mounting hole, and the permanent magnet is located inside the shell.

4. The vacuum circuit breaker according to claim 3, characterized in that: The braking mechanism also includes a first buffer and a second buffer arranged inside the shell, the first buffer and the second buffer are arranged at a distance, and the permanent magnet and the buffer coil are located between the first buffer and the second buffer, and the permanent magnet can abut against the first buffer and the second buffer.

5. The vacuum circuit breaker according to claim 4, characterized in that: An inner diameter of the first through hole is larger than outer diameters of the first buffer component and the second buffer component.

6. The vacuum circuit breaker according to claim 4, characterized in that: The shell includes a first side wall and a second side wall that are arranged opposite to each other, the mounting hole includes a second through hole opened on the first side wall and a third through hole opened on the second side wall, the operating rod is passed through the second through hole and the third through hole, the first buffer member is arranged on the inner edge of the second through hole, and the second buffer member is arranged on the inner edge of the third through hole.

7. The vacuum circuit breaker according to claim 6, characterized in that: The permanent magnet can be adsorbed on the first side wall or the second side wall to keep the moving contact in the closed position or the open position; And / or, the operating rod, the buffer coil, the permanent magnet, the second through hole, the third through hole, the first buffer component and the second buffer component are all coaxially arranged.

8. The vacuum circuit breaker according to claim 1, characterized in that: In the closing position or the opening position, the buffer coil generates no magnetic force on the permanent magnet.

9. The vacuum circuit breaker according to claim 3, characterized in that: The material used for the shell is magnetic conductive material.

10. The vacuum circuit breaker according to claim 1, characterized in that: An insulating rod is also arranged between one end of the moving contact away from the static contact and the operating rod.

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