Pole structure of vacuum circuit breaker and three-station vacuum circuit breaker

Abstract

The utility model relates to the field of circuit breakers, and provides a pole structure of a vacuum circuit breaker and a three-station vacuum circuit breaker, the pole structure of the vacuum circuit breaker comprises an insulating shell, a pull rod structure, a static contact and a moving contact, the insulating shell is provided with a conduction chamber, a connection area and an arc extinguish chamber, a driving port is provided with a sealing cover and a first corrugated pipe, and the connecting area is provided with a second corrugated pipe. The first corrugated pipe is of a pagoda type structure; the pull rod structure is arranged in the conduction chamber, and one end of the pull rod structure penetrates through and is hermetically arranged on the first corrugated pipe; a connecting suite is arranged between one end of the moving contact and the other end of the pull rod structure, and the conducting end face of the moving contact and the conducting end face of the static contact are oppositely arranged. A pagoda-type first corrugated pipe is adopted on a driving port of an insulating shell, so that the first corrugated pipe forms a sequentially stacked state during compression; namely, the thickness of the compressed first corrugated pipe is relatively small, so that the corresponding size can be reduced in the axial direction, and a compact structural design is formed.

Description

Technical Field

[0001] The utility model relates to the field of circuit breakers, in particular to a pole structure of a vacuum circuit breaker and a three-station vacuum circuit breaker. Background Art

[0002] Circuit breaker (English name: circuit-breaker, circuit breaker) refers to a switch device that can close, carry and interrupt the current under normal circuit conditions and can close, carry and interrupt the current under abnormal circuit conditions within a specified time. Among them, vacuum circuit breaker is named because its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum; it has the advantages of small size, light weight, suitable for frequent operation, and arc extinguishing without maintenance, and is widely used in distribution networks.

[0003] The design of the circuit breaker structure provides simple and convenient operating actions while ensuring safety, which will reduce the user's operating time. With the development of circuit breakers, requirements have also been put forward for the size of circuit breakers. Therefore, how to design a compact circuit breaker without affecting its operation is also one of the problems that need to be overcome in existing work. For example, the existing soft connection structure needs to occupy a large space, making the shell of the circuit breaker relatively thick in this part; or, the existing straight-tube bellows has a limited telescopic distance, so it needs a longer length. Utility Model Content

[0004] The utility model aims to provide a pole structure of a vacuum circuit breaker and a three-station vacuum circuit breaker, aiming to improve the problems of the existing vacuum circuit breaker being large in size and having an incompact structure design.

[0005] To achieve the above purpose, the utility model adopts the following technical solution: a pole structure of a vacuum circuit breaker, comprising:

[0006] An insulating housing, wherein a conduction chamber, a connection area and an arc extinguishing chamber are sequentially arranged from the driving port to the lead-out port, a sealing cover and a first bellows sealed on the sealing cover are arranged at the driving port, and the first bellows is a pagoda-type structure;

[0007] A pull rod structure, which is arranged in the conduction chamber, and one end of the pull rod structure penetrates and is sealed on the first bellows;

[0008] A stationary contact, one end of which is located at the lead-out port and is disposed in the arc extinguishing chamber; and

[0009] The moving contact is arranged in the arc extinguishing chamber, and a connecting kit is arranged between one end of the moving contact and the other end of the pull rod structure, the connecting kit is arranged in the connecting area, and the conducting end face of the moving contact is arranged opposite to the conducting end face of the static contact.

[0010] Preferably, a connection seat is provided on the outer side wall of the insulating shell located in the connection area, a first conductor is provided on the side wall of the connection area, and a second conductor electrically connected to the first conductor is provided in the connection seat;

[0011] The first conductor is arranged along the axial ends of the pole for conduction, and the connection kit is sleeved in the first conductor.

[0012] Preferably, at least one annular groove and a conductive contact finger disposed in the annular groove are disposed on the inner side of the first conductive body, and the conductive contact finger and the connecting sleeve are axially slidably disposed.

[0013] Preferably, the pull rod structure comprises a driving rod, a corrugated rod having one end axially connected to the driving rod, and a linkage member, and the driving rod seal is arranged to penetrate the first corrugated tube;

[0014] A accommodating cavity is arranged on the other end of the corrugated rod, one end of the linkage piece is slidably sleeved in the accommodating cavity, a disc spring is arranged between the linkage piece and the bottom of the accommodating cavity, and the other end of the linkage piece passes through the connecting kit and is arranged on the moving contact.

[0015] Preferably, a first corrugated structure is provided on the inner side wall of the conduction chamber, and a second corrugated structure is provided on the outer side surface of the corrugated rod at the position of the accommodating cavity.

[0016] Preferably, a first sealing ring is provided between the sealing cover and the end surface of the driving port, and an opening is provided on the sealing cover;

[0017] The first bellows is provided with a clamping plate for clamping the tower bottom surface of the first bellows, and a second sealing ring is provided between the clamping plate and the first bellows, and the clamping plates are stacked and covered on the opening;

[0018] The driving rod is provided with a threaded section, a nut engaged with the threaded section, and a sealing gasket. The tower top of the first bellows is located at the threaded section and a seal is provided between the nut and the sealing gasket.

[0019] Preferably, an annular plug is provided in the cavity opening of the accommodating cavity, a retaining ring is longitudinally provided at one end of the linkage member, the diameter of the retaining ring is larger than the inner hole diameter of the plug, one end of the linkage member abuts against the disc spring and the other end passes through the plug.

[0020] Preferably, the connection kit is a cylinder, one end of the connection kit is provided with a first cavity which fits with the linkage member, and the other end of the connection kit is provided with a second cavity which fits with the connection end of the moving contact;

[0021] A threaded rod is arranged on the other end of the linkage member. The threaded rod axially penetrates the bottom of the first cavity and is arranged on the connecting end of the moving contact.

[0022] Preferably, a second bellows is provided between the contact portion of the moving contact and the arc extinguishing chamber, one end of the second bellows is sealingly provided on the moving contact, and the other end of the second bellows is sealingly covered on the port of the arc extinguishing chamber.

[0023] A three-station vacuum circuit breaker is also provided, comprising the above-mentioned pole structure of the vacuum circuit breaker.

[0024] After adopting the above technical solution, the utility model has the following advantages compared with the background technology:

[0025] 1. A pagoda-shaped first bellows is used on the driving port of the insulating shell, so when compressed, the first bellows will form a stacked state; that is, the thickness of the first bellows after compression is relatively small, so that the corresponding size can be reduced in the axial direction to form a compact structural design.

[0026] 2. An interface is formed at the connection area by designing the first conductor and the second conductor for electrical connection. The connection can be completed by setting the conductive contact finger structure on the first conductor, and a sliding friction design is formed between the conductive contact finger and the moving contact to achieve the desired electrical connection purpose. At the same time, in terms of structural design, the conductive contact finger cooperates with the pre-embedded conductor to design the structure of the connection area more compactly and reduce the size of the vacuum circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the pole structure of the vacuum circuit breaker described in the utility model;

[0028] Figure 2 A cross-sectional view of the pole structure of the vacuum circuit breaker according to the utility model;

[0029] Figure 3 for Figure 2 A is an enlarged schematic diagram of the circle marked in middle A;

[0030] Figure 4 for Figure 2 A magnified schematic diagram of the circle marked in B.

[0031] Description of reference numerals:

[0032] 10. Insulating housing; 101. Conducting chamber; 102. Connecting area; 103. Arc extinguishing chamber; 104. First bellows; 105. Connecting seat; 106. First bellows structure; 107. Sealing cover; 108. Lead-out port;

[0033] 1031, second bellows;

[0034] 1051, first conductor; 1052, second conductor; 1053, annular groove; 1054, conductive contact finger;

[0035] 1071, first sealing ring; 1072, opening;

[0036] 1081, clamping plate; 1082, second sealing ring;

[0037] 20. pull rod structure; 201. drive rod; 202. corrugated rod; 203. linkage member; 204. disc spring;

[0038] 2011, threaded section; 2012, nut; 2013, sealing gasket;

[0039] 2021, accommodating cavity; 2022, second corrugated structure; 2023, plug;

[0040] 2031, retaining ring; 2032, threaded rod;

[0041] 30. Stationary contact;

[0042] 40. Moving contact;

[0043] 50. Connection kit; 501. First cavity; 502. Second cavity. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0045] In addition, it should be noted that the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] When an element is referred to as being “fixed to” or “disposed on” or “provided on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0047] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0048] Embodiment 1

[0049] Please refer to Figure 1 , Figure 2 and Figure 3 As shown, the present embodiment provides a pole structure of a vacuum circuit breaker, including an insulating housing 10, a pull rod structure 20, a static contact 30 and a moving contact 40, wherein the insulating housing 10 is provided with a conduction chamber 101, a connection area 102 and an arc extinguishing chamber 103 in sequence from a driving port to an outlet port 108, a sealing cover 107 and a first bellows 104 sealed on the sealing cover 107 are provided at the driving port, and the first bellows 104 is a pagoda-type structure; the pull rod structure 20 is provided in the conduction chamber 101, and the pull rod structure 20 is provided with a first bellows 104 sealed on the sealing cover 107. The end passes through and is sealed on the first bellows 104; one end of the static contact 30 is located at the lead-out port 108 and is arranged in the arc extinguishing chamber 103, and a copper conductor is arranged in the lead-out port 108, and the purpose of electrical connection is achieved by connecting with the static contact 30; the moving contact 40 is arranged in the arc extinguishing chamber 103, and a connecting kit 50 is arranged between one end of the moving contact 40 and the other end of the pull rod structure 20, and the connecting kit 50 is arranged in the connecting area 102, and the conducting end face of the moving contact 40 is arranged opposite to the conducting end face of the static contact 30.

[0050] The operation of the pole structure in this embodiment is to drive the pull rod structure 20 to move axially, and then drive the moving contact 40 and the static contact 30 to push against each other to conduct or separate, so as to form the operation of the pole. The connection area 102 can be connected with the isolated and grounded pole, so that the moving contact 40 can be partially switched between isolation and grounding. In addition, the arc extinguishing chamber 103 is in a vacuum state, which can achieve the effect of arc extinguishing, prevent arc breakdown of high voltage electricity, and improve safety.

[0051] Specifically, the sealing cover 107 can be a frame plate, and the pole structure of the vacuum circuit breaker is directly locked on the frame plate, and an opening 1072 is opened at the corresponding driving port to install the first bellows 104. The bottom end of the tower forming the first bellows 104 is sealed and installed in the opening 1072 to form a cover for the opening 1072; and the other end of the first bellows 104 is sealed and installed on the pull rod structure 20, so as to form a sealed connection effect at the position of the opening 1072. In addition, through the design of the first bellows 104, a movable seal can be performed for the vacuum circuit breaker. The pagoda-like structure will also make the thickness of the first bellows 104 relatively small after compression and stacking, which can effectively reduce the axial size and achieve a compact design purpose.

[0052] like Figure 1 and Figure 2 As shown, in this embodiment, a connecting seat 105 is provided on the side wall of the insulating shell 10 located in the connection area 102. The connecting seat 105 is cylindrical, and a cavity with a conical surface is opened on the end face (the conical surface can be a Morse taper), and the conical surface is an inclined surface with a diameter gradually increasing toward the end face of the cavity opening; a first conductor 1051 is provided on the side wall of the connection area 102, and a second conductor 1052 electrically connected to the first conductor 1051 is provided in the connecting seat 105; the first conductor 1051 is arranged to be conductive along the axial ends of the pole, and the connecting kit 50 is sleeved in the first conductor 1051.

[0053] The first conductor 1051 and the second conductor 1052 can be made of copper material. The insulating housing 10 at the connection area 102 is provided with a connection seat 105. The bottom of the connection seat 105 is the second conductor 1052. The second conductor 1052 and the insulating housing 10 are plastic-coated to form a whole, so as to form a sealed and electrically connected effect. Furthermore, the first conductor 1051 and the second conductor 1052 can also be integrally formed, the first conductor 1051 is a hollow cylindrical shape, the second conductor 1052 is a cylindrical shape, and a cavity is provided on one end face to communicate with the connection seat 105, forming a slot structure that can be plugged in and connected. In this way, a structure electrically connected to the outside is formed, while ensuring the sealing inside the insulating housing 10.

[0054] Furthermore, in this embodiment, at least one annular groove 1053 and a conductive contact finger 1054 are arranged on the inner side of the first conductor 1051, and the conductive contact finger 1054 is arranged in the annular groove 1053, and the conductive contact finger 1054 is axially slidably arranged with the connection kit 50. Two annular conductive contact fingers 1054 are installed on the side wall of the inner hole of the first conductor 1051, and the conductive contact fingers 1054 are electrically connected to the moving contact 40, so that the friction between the moving contact 40 and the first conductor 1051 can be reduced, so as to drive the pull rod structure 20 more easily. At the same time, the design of the conductive contact finger 1054 can form a compact conductive structure, form an electrical connection with the moving contact 40, and can correspondingly reduce the size of the pole structure of the vacuum circuit breaker in the diameter direction.

[0055] like Figure 2 , Figure 3 and Figure 4 As shown, the pull rod structure 20 in this embodiment includes a driving rod 201, a corrugated rod 202 axially connected to the driving rod 201 at one end, and a linkage member 203. The driving rod 201 is sealed and penetrates the first corrugated tube 104; a accommodating chamber 2021 is provided on the other end of the corrugated rod 202, one end of the linkage member 203 is slidably sleeved in the accommodating chamber 2021, and a disc spring 204 is provided between the linkage member 203 and the bottom of the accommodating chamber, and the other end of the linkage member 203 penetrates the connecting kit 50 and is arranged on the moving contact 40.

[0056] Specifically, the accommodating cavity 2021 designed on the corrugated rod 202 can accommodate the disc spring 204. After one end of the linkage member 203 is slidably installed in the accommodating cavity 2021, the disc spring 204 can provide an axial push force for the linkage member 203, so that when the moving contact 40 contacts the static contact 30, there is an axial elastic force for abutment, providing a stable matching relationship. The other end of the linkage member 203 can be connected to the moving contact 40 by thread locking to provide a stable structural relationship. The driving rod 201 is sealedly connected to the first bellows 104, and then the first bellows 104 is sealedly connected to the sealing cover 107 to achieve the sealed assembly of the conduction chamber 101. The sealing can be sealed by placing a rubber or silicone pad between the matching structures.

[0057] Furthermore, if Figure 2 and Figure 4 As shown, in this embodiment, an annular plug 2023 is arranged in the cavity opening of the accommodating cavity 2021, and a retaining ring 2031 is arranged in the longitudinal direction at one end of the linkage member 203. The diameter of the retaining ring 2031 is larger than the inner hole diameter of the plug 2023, and one end of the linkage member 203 is against the disc spring 204 and the other end is arranged through the plug 2023.

[0058] The axial section of the linkage member 203 (also called the guide rod) is a "T"-shaped structure. The T-shaped head of the linkage member 203 is slidably engaged in the accommodating cavity 2021 through the retaining ring 2031, and the retaining ring 2031 and the accommodating cavity 2021 can be threaded to form a stable assembly effect. At the same time, it can be pressed against the disc spring 204 to provide a stable elastic force; and when the switch is closed, the linkage member 203 will move with it and compress the disc spring 204, and the travel of the disc spring is 4 to 6 mm.

[0059] Specifically, Figure 2 and Figure 3 As shown, in this embodiment, a first sealing ring 1071 is arranged between the sealing cover 107 and the end face of the driving port, and an opening 1072 is arranged on the sealing cover 107; the first bellows 104 is provided with a clamping plate 1081 for clamping the bottom surface of the tower of the first bellows 104, and a second sealing ring 1082 is arranged between the clamping plate 1081 and the first bellows 104, and the clamping plate 1081 is stacked and covered on the opening 1072; a threaded section 2011, a nut 2012 engaged with the threaded section 2011, and a sealing gasket 2013 are arranged on the driving rod 201, and the top of the first bellows 104 is located at the threaded section 2011 and the seal is arranged between the nut 2012 and the sealing gasket 2013.

[0060] On the contact surface between the sealing cover 107 and the insulating housing 10, a first sealing ring 1071 (which may be a rubber or silicone sealing ring) may be placed for sealing. Since the bellows is made of rubber, multiple annular protrusions may be provided on the bottom surface of the tower to form a corresponding sealing effect when the clamping plate 1081 is clamped and locked. At the same time, the clamping plate 1081 is bolted to the sealing cover 107, and the first bellows 104 also seals the opening 1072 on the sealing cover 107. Furthermore, the other end of the first bellows 104 is locked on the threaded section 2011 by clamping the nut 2012 and the sealing gasket 2013 (an annular protrusion can also be formed between the first bellows 104 and the sealing gasket 2013 for cooperative sealing, or sealed by a sealing ring), thereby locking one end of the first bellows 104 on the driving rod 201, and the other end of the first bellows 104 is locked on the clamping plate 1081, thereby forming a sealed connection for the driving port.

[0061] like Figure 2 and Figure 3 As shown, in this embodiment, a first corrugated structure 106 is provided on the inner wall of the conduction chamber 101, and a second corrugated structure 2022 is provided on the outer surface of the corrugated rod 202 at the position of the accommodating cavity 2021. The corrugated structure design of the first corrugated structure 106, the second corrugated structure 2022 and the corrugated rod 202 can increase the creepage distance and improve the practicality of the structure.

[0062] like Figure 2 and Figure 4 As shown, in this embodiment, the connection kit 50 is a cylinder, and one end of the connection kit 50 is provided with a first cavity 501 that is sleeved with the linkage 203, and the other end of the connection kit 50 is provided with a second cavity 502 that is sleeved with the connection end of the moving contact 40; a threaded rod 2032 is provided on the other end of the linkage 203, and the threaded rod 2032 axially penetrates the cavity bottom of the first cavity 501 and is arranged on the connection end of the moving contact 40. The cylindrical structural design of the connection kit 50 is convenient for sliding with the conductive contact finger 1054. In addition, by sleeve-connecting the linkage 203 with the first cavity 501, sleeve-connecting the moving contact 40 with the second cavity 502, and by the locking connection of the threaded rod 2032, it can be ensured that the conductive contact finger 1054 and the connection kit 50 are in contact and conduct electricity, so as to ensure the smoothness of the operation of the pole structure of the vacuum circuit breaker.

[0063] like Figure 2 As shown, in this embodiment, a second bellows 1031 is provided between the contact portion of the moving contact 40 and the arc extinguishing chamber 103, one end of the second bellows 1031 is sealed and provided on the moving contact 40, and the other end of the second bellows 1031 is sealed and provided on the port of the arc extinguishing chamber 103. The second bellows 1031 can also be a pagoda-shaped bellows, and the arc extinguishing chamber 103 is correspondingly sealed and connected through the design of the bellows. That is, one end of the second bellows 1031 is locked on the moving contact 40 through the gasket nut 2012, and the other end of the second bellows 1031 can also be locked in the arc extinguishing chamber 103 through the gasket, so as to form a seal and ensure that the arc extinguishing chamber 103 is in a vacuum state, so as to achieve the purpose of vacuum arc extinguishing.

[0064] The second bellows 1031 can also be a straight tube-like cylindrical structure made of metal material (for example, brass), and the cross-sectional shape of the cylindrical structure is wavy. The second bellows 1031 is fixed between the arc extinguishing chamber 103 and the moving contact 40 (for example, installed by bolt locking, or connected by thread locking). The wavy second bellows 1031 can expand and contract with the movement of the moving contact 40, thereby always maintaining a sealed state to ensure the insulation performance of the arc extinguishing chamber 103.

[0065] Embodiment 2

[0066] This embodiment provides a three-station vacuum circuit breaker (not shown), including the pole structure of the vacuum circuit breaker as described in the first embodiment. The axial size of the vacuum circuit breaker can be reduced by designing the bellows structure; and the design of the conductive member and the conductive contact finger can reduce the longitudinal size in the connection area, thereby forming a relatively compact structural design effect. At the same time, the three-station pull rod structure can be exposed outside the insulating shell for linkage connection to form a synchronous operation pull rod structure. By pulling the pull rod structure, the moving contact and the static contact are connected or disconnected, thereby achieving the purpose of connecting or disconnecting the entire vacuum circuit breaker, and the operation is simple and convenient.

[0067] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A pole structure of a vacuum circuit breaker, characterized in that: include: An insulating housing, wherein a conduction chamber, a connection area and an arc extinguishing chamber are sequentially arranged from the driving port to the lead-out port, a sealing cover and a first bellows sealed on the sealing cover are arranged at the driving port, and the first bellows is a pagoda-type structure; A pull rod structure, which is arranged in the conduction chamber, and one end of the pull rod structure penetrates and is sealed on the first bellows; A stationary contact, one end of which is located at the lead-out port and is arranged in the arc extinguishing chamber; and The moving contact is arranged in the arc extinguishing chamber, and a connecting kit is arranged between one end of the moving contact and the other end of the pull rod structure, the connecting kit is arranged in the connecting area, and the conducting end face of the moving contact is arranged opposite to the conducting end face of the static contact.

2. The pole structure of the vacuum circuit breaker according to claim 1, characterized in that: The outer side wall of the insulating shell located in the connection area is provided with a connection seat, the side wall of the connection area is provided with a first conductor, and the connection seat is provided with a second conductor electrically connected to the first conductor; The first conductor is arranged along the axial ends of the pole for conduction, and the connection kit is sleeved in the first conductor.

3. The pole structure of the vacuum circuit breaker according to claim 2, characterized in that: At least one annular groove and a conductive contact finger disposed in the annular groove are disposed on the inner side of the first conductive body, and the conductive contact finger is axially slidably disposed with respect to the connection kit.

4. The pole structure of the vacuum circuit breaker according to claim 1, characterized in that: The pull rod structure includes a driving rod, a corrugated rod axially connected to the driving rod at one end, and a linkage member, and the driving rod seal is arranged to penetrate the first corrugated tube; A accommodating cavity is arranged on the other end of the corrugated rod, one end of the linkage piece is slidably sleeved in the accommodating cavity, a disc spring is arranged between the linkage piece and the bottom of the accommodating cavity, and the other end of the linkage piece passes through the connecting kit and is arranged on the moving contact.

5. The pole structure of the vacuum circuit breaker according to claim 4, characterized in that: A first corrugated structure is arranged on the inner side wall of the conduction chamber, and a second corrugated structure is arranged on the outer side surface of the corrugated rod at the position of the accommodating cavity.

6. The pole structure of the vacuum circuit breaker according to claim 4, characterized in that: A first sealing ring is arranged between the sealing cover and the end surface of the driving port, and an opening is arranged on the sealing cover; The first bellows is provided with a clamping plate for clamping the tower bottom surface of the first bellows, and a second sealing ring is provided between the clamping plate and the first bellows, and the clamping plates are stacked and covered on the opening; The driving rod is provided with a threaded section, a nut engaged with the threaded section, and a sealing gasket. The tower top of the first bellows is located at the threaded section and a seal is provided between the nut and the sealing gasket.

7. The pole structure of the vacuum circuit breaker according to claim 4, characterized in that: An annular plug is arranged in the cavity opening of the accommodating cavity, a retaining ring is arranged radially at one end of the linkage member, the diameter of the retaining ring is larger than the inner hole diameter of the plug, one end of the linkage member abuts against the disc spring and the other end passes through the plug.

8. The pole structure of the vacuum circuit breaker according to claim 4, characterized in that: The connecting sleeve is a cylinder, one end of which is provided with a first cavity which fits with the linkage member, and the other end of which is provided with a second cavity which fits with the connecting end of the moving contact; A threaded rod is arranged on the other end of the linkage member. The threaded rod axially penetrates the bottom of the first cavity and is arranged on the connecting end of the moving contact.

9. The pole structure of the vacuum circuit breaker according to claim 2, characterized in that: A second bellows is arranged between the contact portion of the moving contact and the arc extinguishing chamber, one end of the second bellows is sealed on the moving contact, and the other end of the second bellows is sealed on the port of the arc extinguishing chamber.

10. A three-station vacuum circuit breaker, characterized in that: A vacuum circuit breaker pole structure comprising the vacuum circuit breaker pole structure according to any one of claims 1 to 9.

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