Contact supporting structure of vacuum arc-extinguishing chamber, vacuum arc-extinguishing chamber and use method

Abstract

The invention discloses a contact supporting structure of a vacuum arc-extinguishing chamber, the vacuum arc-extinguishing chamber and a using method, and relates to the technical field of vacuum arc-extinguishing chambers. The magnetic control cup comprises a cup base, a contact blade, a magnetic control element, a central supporting body and an anti-rotation limiting piece. The contact blade is combined with the cup base, and the magnetic control element and the center supporting body are arranged in a cavity defined by the cup base and the contact blade. The lower end of the central supporting body is fixed with the contact blade, the upper end of the central supporting body is separated from the inner bottom surface of the cup base, and the periphery of the central supporting body is provided with a magnetic control element placing station. The anti-rotation limiting piece is provided with a fixed end and a limiting end, the fixed end and the cup base are coaxially fixed, and the limiting end extends into the cavity to penetrate through the center supporting body to limit rotation of the center supporting body and restrain the limiting distance of the center supporting body away from the inner bottom face of the cup base. Shunting of the ferromagnetic block and the stainless steel support during opening of the moving and static contacts can be avoided, and a strong longitudinal magnetic field is maintained; the contact is ensured to be sufficiently supported during closing stress, and rotation deformation of the contact finger of the cup base and deformation of the contact are avoided.

Description

Technical Field

[0001] This invention relates to the field of vacuum interrupter technology, and in particular to a contact support structure for a vacuum interrupter, a vacuum interrupter, and a method of using it. Background Technology

[0002] In vacuum interrupter technology, vacuum interrupters with a cup-shaped longitudinal magnetic structure typically use a longitudinal magnetic field to control the arc shape, keeping the arc in a diffused state and reducing the erosion of the moving and stationary contact plates caused by current accumulation. The magnitude of the longitudinal magnetic field of the cup-shaped contact is crucial to the short-circuit breaking capacity.

[0003] In a traditional cup-shaped longitudinal magnetic vacuum interrupter, the cup-shaped contact seat has evenly distributed spiral grooves cut around its circumference, forming multiple spiral cup fingers. The bottom of the cup fingers is welded to the ablation-resistant contact plate. During the breaking process, the short-circuit current flows along the current path of the spiral cup fingers of the cup seat, forming an axial longitudinal magnetic field in the middle of the contact. To enhance the strength of the longitudinal magnetic field, ferromagnetic blocks are placed at specific locations within the cavity of the cup seat; to improve the overall strength of the contact, a stainless steel support block is placed in the central position inside.

[0004] However, the welding contact between the ferromagnetic block, the stainless steel support block, and the cup holder and contact plates significantly affects the longitudinal magnetic field distribution of the arc-extinguishing chamber. For example, to improve support strength, the central stainless steel support is welded to both the bottom of the cup holder and the contact plates. This will cause current shunting due to the conductivity of the stainless steel support, preventing some current from passing through the spiral contact fingers of the cup holder, thus weakening the longitudinal magnetic field. Similarly, when the ferromagnetic block in the cup holder cavity is in contact with both the cup holder and the contact plates, it will also form a current branch, causing current shunting and reducing the longitudinal magnetic field. On the other hand, if the stainless steel support is not welded to the bottom of the cup holder or the contact plates, or is only welded on one side, the electrodynamic force on the contact plates and the welding force between the contact plates will cause severe deformation of the contact plates, ultimately affecting the mechanical and electrical performance of the arc-extinguishing chamber.

[0005] In summary, the existing technology has shortcomings in the support structure of vacuum interrupters, and cannot simultaneously meet the requirements of maintaining the longitudinal magnetic field strength and ensuring the strength of the contact structure. Therefore, there is an urgent need for an improved support structure for vacuum interrupters. Summary of the Invention

[0006] The purpose of this invention is to provide a contact support structure, a vacuum interrupter, and a method of use for a vacuum interrupter, in order to solve the problems existing in the prior art, effectively avoid reducing the current diversion of the ferromagnetic block and stainless steel support during the opening process of the moving and stationary contacts, thereby maintaining a strong longitudinal magnetic field; and ensure that the contacts have sufficient support when under closing force, effectively avoiding the rotational deformation of the cup seat contact fingers and effectively preventing contact deformation.

[0007] To achieve the above objectives, the present invention provides the following solution: This invention provides a contact support structure for a vacuum interrupter, including a cup holder, a contact piece coupled to the cup holder, and a magnetic control element disposed within a cavity formed by the cup holder and the contact piece. It also includes a central support body and an anti-rotation limiting member. The central support body is disposed within the cavity and coaxially arranged with the cup holder. The central support body has an upper end and a lower end opposite to each other. The lower end is fixedly connected to the contact piece, and the upper end is spaced apart from the inner bottom surface of the cup holder. A magnetic control element placement station is provided on the outer periphery of the central support body. The anti-rotation limiting member has a fixed end and a limiting end opposite to each other. The fixed end is used for coaxial fixed connection with the cup holder, and the limiting end is used to extend into the cavity and coaxially pass through the central support body to restrict the rotation of the central support body and to constrain the central support body to a maximum distance away from the inner bottom surface of the cup holder.

[0008] Preferably, the limiting end includes an integrally connected first limiting step and a non-circular rod. The central support body is provided with an anti-rotation hole and a second limiting step in the middle. The inner wall of the anti-rotation hole is adapted to the shape of the outer wall of the non-circular rod. The non-circular rod is inserted into the anti-rotation hole to achieve circumferential fixation. The first limiting step and the second limiting step abut against each other to limit the range of movement of the central support body away from the inner bottom surface of the cup holder along the axial direction.

[0009] Preferably, the two sides of the non-circular rod are two rectangular surfaces formed by milling, and the two rectangular surfaces are arranged in parallel.

[0010] Preferably, the magnetic control element is a split magnetic ring, comprising at least two magnetic block units.

[0011] Preferably, the central support is a stainless steel support, and multiple support ribs are integrally connected to the outer side wall of the central support to form the placement station of the magnetic control element, and each of the magnetic block units is embedded on the support ribs.

[0012] Preferably, the supporting rib has a positioning protrusion parallel to the axis of the central support on the side away from the axis of the central support, and the inner side of the magnetic block unit has a positioning groove adapted to the positioning protrusion.

[0013] Preferably, the cup holder includes a plurality of spiral fingers extending from its base, the ends of which are fixedly connected to the contact plate.

[0014] Preferably, the fixed end is welded to the cup seat to form a first welding surface, the central support body is welded to the contact piece to form a second welding surface, and the spiral contact finger is welded to the contact piece to form a third welding surface.

[0015] The present invention also provides a vacuum interrupter, comprising a housing and a stationary contact assembly and a moving contact assembly disposed within the housing, characterized in that: at least one of the stationary contact assembly and the moving contact assembly adopts a contact support structure as described in any of the preceding claims, wherein the contact piece in the contact support structure is fixedly connected to the stationary contact or the moving contact, and the cup holder is fixedly connected to the inner wall of the housing or the conductive rod.

[0016] The present invention provides a method for using a vacuum interrupter as described above, comprising the following steps: S1: Install the vacuum interrupter inside the insulating frame of the circuit breaker, so that the stationary contact assembly and the fixed end of the housing remain relatively stationary, and the moving contact assembly is connected to the operating mechanism through a conductive rod. S2: When the circuit breaker receives a closing command, the operating mechanism drives the moving contact assembly to move towards the stationary contact assembly. The contact piece drives the central support body to slide along the axial direction of the anti-rotation limiter until the moving and stationary contacts contact to form a conductive path. At this time, the upper end of the central support body contacts the inner bottom surface of the cup seat, and the magnetic control element contacts the contact piece, thereby forming three closing circuits: the contact piece and the magnetic block, the contact piece and the central support body, and the contact piece and the spiral contact finger, increasing the current carrying capacity of closing.

[0017] S3: When a short circuit fault occurs in the circuit, the circuit breaker tripping command triggers the operating mechanism to drive the moving contact assembly to separate quickly, generating an electric arc between the moving and stationary contacts. The magnetic control element forms a transverse magnetic field under the positioning action of the central support body to drive the electric arc to rotate. At the same time, the limiting end of the anti-rotation limiting component constrains the maximum displacement of the central support body through the second limiting step. S4: During the opening process, the central support body is kept circumferentially fixed through the anti-rotation hole and the cooperation of the non-circular rod to ensure the stability of the magnetic field direction of the magnetic control element until the moving and stationary contacts are completely separated. The arc is extinguished under the action of the transverse magnetic field, and the central support body returns to the initial position under the action of the contact piece. Its upper end maintains a set distance from the inner bottom surface of the cup seat. S5: After the final trip is completed, the magnetic control element is disengaged from the contact piece and the cup holder, the central support is disengaged from the cup holder, and the central support is loosely connected to the anti-rotation limiter. At this time, the contact piece and the spiral contact finger are in direct contact, so that the tripping current selects to pass through the spiral contact finger, maintains the current density, maintains the magnetic field strength, and is conducive to breaking.

[0018] The present invention achieves the following technical effects compared to the prior art: This invention provides a contact support structure for a vacuum interrupter, the vacuum interrupter itself, and a method of use. By setting the central support body and the inner bottom surface of the cup holder at an interval, in the open state, the central support body and the cup holder are prevented from forming a current branch, and the magnetic control element is disengaged from the contact plate and the cup holder, ensuring that the current mainly flows through the spiral contact finger, effectively maintaining the longitudinal magnetic field strength. In the closing state, the upper end of the central support body contacts the inner bottom surface of the cup holder, and the magnetic control element contacts the contact plate, thereby forming three closing circuits: contact plate and magnetic block, contact plate and central support body, and contact plate and spiral contact finger, increasing the current carrying capacity during closing. The anti-rotation limiting component not only restricts the circumferential rotation of the central support body to ensure the stability of the magnetic field direction of the magnetic control element, but also constrains its axial displacement range, preventing the central support body from moving too far away from the inner bottom surface of the cup holder, which would lead to structural instability. Thus, in the opening and closing processes, the dual goals of maintaining magnetic field strength and ensuring structural strength are achieved, solving the problem that the support structure in the prior art is difficult to balance both. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A cross-sectional view of the contact support structure of the vacuum interrupter provided by the present invention; Figure 2 Exploded view of the central support body and anti-rotation limiting member of the contact support structure of the vacuum interrupter provided by the present invention; Figure 3 A cross-sectional view of the central support and anti-rotation limiting member of the contact support structure of the vacuum interrupter provided by the present invention; Figure 4 A diagram showing the connection of the magnetic control element in the contact support structure of the vacuum interrupter provided by the present invention; Figure 5 A front view of the spiral contact fingers and contact plates of the contact support structure of the vacuum interrupter provided by the present invention; In the diagram: 1. Cup holder; 11. Spiral finger; 2. Contact plate; 3. Magnetically controlled element; 4. Central support; 41. Second limiting step; 42. Anti-rotation hole; 43. Support rib; 44. Positioning protrusion; 5. Anti-rotation limiting component; 51. Non-circular rod; 52. First limiting step; 6. First welding surface; 7. Second welding surface; 8. Third welding surface. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described 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.

[0022] The purpose of this invention is to provide a contact support structure, a vacuum interrupter, and a method of use for a vacuum interrupter, in order to solve the problems existing in the prior art, effectively avoid reducing the current diversion of the ferromagnetic block and stainless steel support during the opening process of the moving and stationary contacts, thereby maintaining a strong longitudinal magnetic field; and ensure that the contacts have sufficient support when under closing force, effectively avoiding the rotational deformation of the cup seat contact fingers and effectively preventing contact deformation.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1 This invention provides a contact support structure for a vacuum interrupter, as shown in Figures 1-5. It includes a cup holder 1, a contact piece 2 connected to the cup holder 1, and a magnetic control element 3 disposed within a cavity formed by the cup holder 1 and the contact piece 2. It also includes a central support 4 and an anti-rotation limiting member 5. The central support 4 is disposed within the cavity and coaxially with the cup holder 1. The central support 4 has an upper end and a lower end that are oppositely positioned. The lower end is fixedly connected to the contact piece 2, and the upper end is spaced apart from the inner bottom surface of the cup holder 1. A placement station for the magnetic control element 3 is provided on the outer periphery of the central support 4. The central support 4 is coaxially with the cup holder 1, and its upper and lower ends are connected to different components using specific connection methods, ensuring structural stability and providing a reasonable placement for the magnetic control element 3. The optimized positioning of the vacuum interrupter chamber improves overall performance. The anti-rotation limiting component 5 has a fixed end and a limiting end that are set opposite to each other. The fixed end is used to be fixedly connected to the cup holder 1 coaxially, and the limiting end is used to extend into the cavity and coaxially pass through the central support body 4 to limit the rotation of the central support body 4 and constrain the central support body 4 from the inner bottom surface of the cup holder 1. The anti-rotation limiting component 5 not only effectively prevents the central support body 4 from rotating, avoiding instability of the internal structure and disorder of the magnetic field distribution caused by rotation, but also limits the axial displacement of the central support body 4, ensuring that it works in the specified position and guaranteeing the stability and reliability of the contact support structure.

[0025] In a preferred embodiment, the limiting end includes an integrally connected first limiting step 52 and a non-circular rod 51. The central support body 4 has an anti-rotation hole 42 and a second limiting step 41 in its middle. The inner wall of the anti-rotation hole 42 is adapted to the shape of the outer wall of the non-circular rod 51. The non-circular rod 51 is inserted into the anti-rotation hole 42 to achieve circumferential fixation. The first limiting step 52 and the second limiting step 41 abut against each other to limit the range of movement of the central support body 4 away from the inner bottom surface of the cup seat 1 along the axial direction. This specific limiting structure design achieves circumferential fixation through the cooperation of the non-circular rod 51 and the anti-rotation hole 42, so that the central support body 4 will not rotate arbitrarily in the circumferential direction, ensuring the accuracy of the position of components such as the magnetic control element 3. The abutment of the first limiting step 52 and the second limiting step 41 also precisely limits the range of axial movement, further improving the stability of the structure and helping to improve the stability and consistency of the arc-extinguishing chamber performance.

[0026] In a preferred embodiment, the two sides of the non-circular rod 51 are milled into two rectangular surfaces, which are arranged in parallel. The milling of the two sides of the non-circular rod 51 into parallel rectangular surfaces makes it easier to install with the anti-rotation hole 42 and makes it easier to ensure accuracy during manufacturing and assembly. On the other hand, this design may provide a more convenient positioning and connection method when working with other components, improving the assembly convenience and accuracy of the overall structure.

[0027] In a preferred embodiment, the magnetic control element 3 is a split magnetic ring, comprising at least two magnetic block units. Using a split magnetic ring can, to some extent, prevent the generation of eddy currents and, compared to a monolithic structure, better optimize the magnetic field distribution. Since the magnetic block units are separate and have gaps between them, the circular path of current formation can be reduced, effectively mitigating the adverse effects of eddy currents on the magnetic field and arc-extinguishing performance.

[0028] In a preferred embodiment, the central support 4 is a stainless steel support. Multiple support ribs 43 are integrally connected to the outer circumferential wall of the central support 4 to form a placement station for the magnetic control element 3. Each magnetically conductive block unit is embedded in the support rib 43. The stainless steel central support 4 has good strength and durability. The design of the support ribs 43 provides a precise placement position for the magnetically conductive block units, effectively fixing them and ensuring the positional stability of the magnetic control element 3 during operation. This ensures the stability and accuracy of the generated magnetic field, which is beneficial for improving the arc-extinguishing effect of the arc-extinguishing chamber.

[0029] In a preferred embodiment, the support rib 43 has a positioning protrusion 44 parallel to the axis of the central support body 4 on the side away from the axis of the central support body 4. The inner side of the magnetic block unit has a positioning groove that matches the positioning protrusion 44. The cooperation between the positioning protrusion 44 and the positioning groove further improves the accuracy and stability of the installation of the magnetic block unit. It can not only quickly and accurately position the installation position of the magnetic block unit, but also prevent the magnetic block unit from shifting during operation, ensuring the stability and reliability of the magnetic field, thereby improving the stability of the arc-extinguishing chamber performance.

[0030] In a preferred embodiment, the cup holder 1 includes a plurality of spiral fingers 11 extending from its base. The ends of the spiral fingers 11 are fixedly connected to the contact plate 2. The design of the spiral fingers 11 helps to generate a magnetic field with a specific direction and distribution. When current passes through, it can form a longitudinal magnetic field or other magnetic field shape that is conducive to arc extinguishing, reduce current concentration, reduce the degree of local ablation of the contact plate 2, and effectively improve the service life of the contact and the breaking capacity of the arc extinguishing chamber.

[0031] In a preferred embodiment, the fixed end is welded to the cup seat 1 to form a first welding surface 6, the central support body 4 is welded to the contact piece 2 to form a second welding surface 7, and the spiral contact finger 11 is welded to the contact piece 2 to form a third welding surface 8. Through multiple welding fixations, a firm connection is formed between the components, which improves the mechanical strength and stability of the overall contact support structure. This ensures that during the operation of the vacuum interrupter, the components will not loosen or shift due to vibration, electrodynamics, or other factors, thereby ensuring the reliability and stability of the interrupter's operation.

[0032] Example 2 This embodiment also provides a vacuum interrupter, including a housing and a stationary contact assembly and a moving contact assembly disposed within the housing. The feature is that at least one of the stationary contact assembly and the moving contact assembly employs a contact support structure as described in Embodiment 1. The contact piece 2 in the contact support structure is fixedly connected to the stationary or moving contact, and the cup holder 1 is fixedly connected to the inner wall of the housing or a conductive rod. The application of the contact support structure of Embodiment 1 to the stationary and moving contact assemblies further optimizes the mechanical and magnetic circuit structure inside the vacuum interrupter. Through the fixed connection of the contact piece 2 to the stationary and moving contacts, and the cup holder 1 to the inner wall of the housing or a conductive rod, good electrical connection and mechanical stability are achieved, thus improving the overall performance of the vacuum interrupter, including its breaking capacity and current carrying capacity.

[0033] Example 3 The present invention provides a method for using a vacuum interrupter as described in Embodiment 2, comprising the following steps: S1: The vacuum interrupter is installed inside the insulating frame of the circuit breaker, so that the stationary contact assembly and the fixed end of the housing remain relatively stationary. The moving contact assembly is connected to the operating mechanism through a conductive rod. This installation method clarifies the position and connection relationship of the vacuum interrupter in the circuit breaker, ensures its coordinated work with the entire circuit breaker system, lays the foundation for the subsequent accurate realization of closing and opening functions, and ensures the stability and reliability of system operation.

[0034] S2: When the circuit breaker receives a closing command, the operating mechanism drives the moving contact assembly to move towards the stationary contact assembly. The contact piece 2 drives the central support body 4 to slide along the axial direction of the anti-rotation limiter 5 until the moving and stationary contacts contact to form a conductive path. At this time, the upper end of the central support body 4 contacts the inner bottom surface of the cup seat 1, and the magnetic control element 3 contacts the contact piece 2, thereby forming three closing circuits: contact piece 2 and magnetic block, contact piece 2 and central support body 4, and contact piece 2 and spiral contact finger 11. This increases the current carrying capacity during closing. During the closing process, the components work together to form three closing circuits, which greatly improves the current carrying capacity during closing. This can better meet the transmission requirements of large current when the circuit is conducting, reduce problems such as overheating and arcing caused by insufficient current carrying capacity, and improve the safety and stability of equipment operation.

[0035] S3: When a short-circuit fault occurs in the circuit, the circuit breaker tripping command triggers the operating mechanism to quickly separate the moving contact assembly, generating an electric arc between the moving and stationary contacts. Under the positioning action of the central support body 4, the magnetic control element 3 forms a transverse magnetic field that drives the arc to rotate. At the same time, the limiting end of the anti-rotation limiting component 5 constrains the maximum displacement of the central support body 4 through the second limiting step 41. During a short-circuit fault, multiple structures work together. The transverse magnetic field formed by the magnetic control element 3 drives the arc to rotate, which is beneficial for the rapid elongation and extinguishing of the arc. The constraint of the displacement of the central support body 4 by the anti-rotation limiting component 5 ensures the stability of the structure and avoids damage to components or disordered magnetic field distribution due to excessive displacement, effectively ensuring the performance of the arc extinguishing chamber under extreme working conditions.

[0036] S4: During the opening process, the central support 4 is circumferentially fixed through the anti-rotation hole 42 and the non-circular rod 51, ensuring the stability of the magnetic field direction of the magnetic control element 3 until the moving and stationary contacts are completely separated. The arc is extinguished under the action of the transverse magnetic field. The central support 4 returns to its initial position under the action of the contact piece 2, and its upper end maintains a set interval with the inner bottom surface of the cup seat 1. The circumferential fixation of the central support 4 ensures the stability of the magnetic field direction formed by the magnetic control element 3. The stable magnetic field direction is conducive to maintaining the stability of the arc rotation direction, thereby extinguishing the arc more efficiently. After the opening is completed, the central support 4 returns to its initial position and maintains the set interval, preparing for the next closing, ensuring the repeatability and stability of the arc extinguishing chamber's working process.

[0037] S5: After the final tripping is completed, the magnetic control element 3 is disengaged from the contact piece 2 and the cup holder 1, the central support 4 is disengaged from the cup holder 1, and the central support 4 is loosely connected to the anti-rotation limiter 5. At this time, the contact piece 2 and the spiral contact finger 11 are in direct contact, so that the tripping current selects to pass through the spiral contact finger 11, maintaining the current density and the magnetic field strength, which is conducive to breaking. After the tripping is completed, the separation of each component allows the current to select to pass through the spiral contact finger 11, effectively maintaining the current density and magnetic field strength, avoiding the weakening of the magnetic field strength by the current shunting, providing favorable conditions for quickly breaking the circuit and extinguishing the arc, improving the tripping and breaking capacity of the arc-extinguishing chamber, and ensuring safe and reliable circuit disconnection when the power system fails.

[0038] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A contact support structure of a vacuum interrupter, comprising a cup (1), a contact blade (2) combined with the cup (1), and a magnetron element (3) arranged in a cavity surrounded by the cup (1) and the contact blade (2), characterized in that: Further comprising a central support body (4) arranged in the cavity and coaxially arranged with the cup seat (1), the central support body (4) has oppositely arranged upper end and lower end, the lower end is fixedly connected with the contact piece (2), the upper end is spaced apart from the inner bottom surface of the cup seat (1), the outer periphery of the central support body (4) is provided with a magnetic control element (3) placement station; The anti-rotation limiting piece (5) has oppositely arranged fixed end and limiting end, the fixed end is used for coaxial fixed connection with the cup seat (1), the limiting end is used for extending into the cavity and coaxially penetrating the central support body (4) to limit the rotation of the central support body (4), and the limiting distance of the central support body (4) away from the inner bottom surface of the cup seat (1) is restricted.

2. The contact support structure of a vacuum interrupter according to claim 1, characterized in that: The limiting end comprises a first limiting step (52) and a non-circular rod (51) connected integrally, the middle part of the central support body (4) is provided with an anti-rotation hole (42) and a second limiting step (41), the inner wall of the anti-rotation hole (42) is matched with the shape of the outer wall of the non-circular rod (51), the non-circular rod (51) is inserted into the anti-rotation hole (42) to realize circumferential fixation, the first limiting step (52) and the second limiting step (41) abut to limit the movement range of the central support body (4) away from the inner bottom surface of the cup seat (1) along the axial direction.

3. The contact support structure of a vacuum interrupter according to claim 2, characterized in that: The two sides of the non-circular rod (51) are two rectangular surfaces formed by milling, and the two rectangular surfaces are arranged in parallel.

4. The contact support structure of a vacuum interrupter according to claim 3, characterized in that, The magnetic control element (3) is a split type magnetic conducting ring, comprising at least two magnetic conducting block units.

5. The contact support structure of a vacuum interrupter according to claim 4, characterized in that, The central support body (4) is a stainless steel support body, a plurality of support ribs (43) are integrally connected to the outer side wall of the central support body (4) in the circumferential direction to form the magnetic control element (3) placement station, and each magnetic conducting block unit is embedded on the support rib (43).

6. The contact support structure of a vacuum interrupter according to claim 5, characterized in that, The side of the support rib (43) away from the axis of the central support body (4) is provided with a positioning protrusion (44) parallel to the axis of the central support body (4), and the inner side of the magnetic conducting block unit is provided with a positioning groove matched with the positioning protrusion (44).

7. The contact support structure of a vacuum interrupter according to claim 1, characterized in that, The cup seat (1) comprises a plurality of spiral-shaped contact fingers (11) extending from the base thereof, and the end of the spiral-shaped contact finger (11) is fixedly connected with the contact piece (2).

8. The contact support structure of a vacuum interrupter according to any one of claims 1 to 7, characterized in that, The fixed end and the cup seat (1) are welded to form a first welding surface (6), the central support body (4) and the contact piece (2) are welded to form a second welding surface (7), and the spiral-shaped contact finger (11) and the contact piece (2) are welded to form a third welding surface (8).

9. A vacuum interrupter comprising a housing and a stationary contact assembly and a movable contact assembly disposed within the housing, characterized by: At least one of the stationary contact assembly and the movable contact assembly adopts the contact support structure as claimed in any one of claims 1-8, the contact piece (2) in the contact support structure is fixedly connected with the stationary contact or the movable contact, and the cup seat (1) is fixedly connected with the inner wall of the shell or the conductive rod.

10. A method of using a vacuum interrupter according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: S1: Install the vacuum interrupter in the insulating frame of the circuit breaker, so that the static contact assembly remains relatively stationary with the fixed end of the housing, and the moving contact assembly is connected to the operating mechanism through the conductive rod; S2: When the circuit breaker receives a closing instruction, the operating mechanism drives the moving contact assembly to move towards the static contact assembly, the contact piece (2) drives the center support body (4) to slide along the anti-rotation limiting piece (5) in the axial direction until the moving and static contacts form a conductive path, at this time, the upper end of the center support body (4) is in contact with the inner bottom surface of the cup seat (1), and the magnetic control element (3) is in contact with the contact piece (2), thereby forming three closing circuits of the contact piece (2) and the magnetic block, the contact piece (2) and the center support body (4), and the contact piece (2) and the spiral contact finger (11), which increases the through current capacity of closing; S3: When a short circuit fault occurs in the circuit, the circuit breaker opening instruction triggers the operating mechanism to drive the moving contact assembly to quickly separate, and the arc is generated between the moving and static contacts, the magnetic control element (3) forms a transverse magnetic field under the positioning action of the center support body (4) to drive the arc to rotate, and the limiting end of the anti-rotation limiting piece (5) restricts the maximum displacement of the center support body (4) through the second limiting step (41); S4: During the opening process, the center support body (4) is fixed in the circumferential direction through the cooperation of the anti-rotation hole (42) and the non-circular rod (51), which ensures the stability of the magnetic field direction of the magnetic control element (3), until the moving and static contacts are completely separated, the arc is extinguished under the action of the transverse magnetic field, and the center support body (4) is restored to the initial position under the driving of the contact piece (2), and the upper end thereof maintains a set interval with the inner bottom surface of the cup seat (1); S5: After the final opening is completed, the magnetic control element (3) is separated from the contact piece (2) and the cup seat (1), the center support body (4) is separated from the cup seat (1), and the center support body (4) is virtually connected with the anti-rotation limiting piece (5), at this time, the contact piece (2) and the spiral contact finger (11) are directly contacted to make the opening current select to pass through the spiral contact finger (11), maintain the current density, and maintain the magnetic field strength, which is conducive to breaking.

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