Bipolar longitudinal magnetic contact structure and vacuum interrupter

Abstract

The present invention relates to a bipolar longitudinal magnetic contact structure and a vacuum arc extinguishing chamber. The bipolar longitudinal magnetic contact structure includes: a static contact assembly, the static contact assembly includes a static conductive rod, a static contact piece, and a static side U-shaped iron core; a moving contact assembly, the moving contact assembly includes a moving conductive rod, a moving contact piece, and a moving side U-shaped iron core; and also includes: a moving side iron core support, which is fixedly connected to the moving side U-shaped iron core and is used to fix the moving side U-shaped iron core to the moving end of the vacuum arc extinguishing chamber; the moving contact piece of the moving contact assembly is arranged separately from the moving side U-shaped iron core, and the moving contact piece can realize opening and closing under the drive of the moving conductive rod. The above scheme can solve the problem of excessive concentration of local arcs when the contact spacing is small during the opening process of the existing bipolar longitudinal magnetic contact structure.

Description

Technical Field

[0001] The invention relates to a bipolar longitudinal magnetic contact structure and a vacuum arc extinguishing chamber. Background Art

[0002] Vacuum circuit breakers are widely used in AC power grids in the medium and low voltage fields due to their high reliability and environmental friendliness. The vacuum arc chamber, as its core component, affects the successful breaking of the vacuum circuit breaker. At present, in order to improve the short-circuit current breaking capacity of the vacuum arc chamber, the magnetic field control technology of the vacuum arc is usually adopted, mainly including the transverse magnetic field control technology and the longitudinal magnetic field control technology. For example, the Chinese patent document with publication number CN110379670B discloses a background technology of a high-current-carrying capacity vacuum arc chamber with a fixed break. The transverse magnetic field technology is to use a specific contact structure so that the current path formed during the arcing process forms a transverse magnetic field perpendicular to the arc current flow direction in the contact and its contact gap area. The transverse magnetic field acts on the vacuum arc, driving it to rotate on the contact surface, avoiding excessive local ablation of the contact by the arc, so as to improve the breaking capacity of the switch. The longitudinal magnetic field technology forms a magnetic field parallel to the arc current flow direction through the contact structure, so that the vacuum arc diffuses and burns evenly, reducing the concentration of the vacuum arc and alleviating the local ablation of the arc on the contact surface, thereby improving the breaking capacity of the switch.

[0003] For longitudinal magnetic contacts, they can still maintain a strong magnetic field at a large opening distance, and have a strong breaking capacity, but the contact structure is relatively complex, the loop resistance is large, and the rated current carrying capacity is low; for transverse magnetic contacts, their loop resistance is small, but the magnetic field is weak at a large opening distance, and the short-circuit current breaking capacity is low. In the interruption of large currents at higher voltage levels, since the contact spacing is often high at this time, and the longitudinal magnetic field can still effectively suppress arc aggregation when the contact spacing is large, and improve the breaking capacity of the vacuum circuit breaker, the vacuum arc chamber at higher voltage levels usually adopts a longitudinal magnetic contact structure, that is, a contact structure that can generate a longitudinal magnetic field. Existing longitudinal magnetic contact structures, such as a high-rated current longitudinal magnetic field vacuum arc chamber contact structure disclosed in the patent document with publication number CN107093535B, and a contact structure used in a longitudinal magnetic fan-shaped iron core contact assembly disclosed in the patent document with publication number CN107993882B, are both bipolar longitudinal magnetic contact structures with an iron core. The bipolar longitudinal magnetic contact structure includes a stationary contact assembly and a moving contact assembly. The stationary contact assembly includes a stationary conductive rod, a stationary contact piece, and a stationary side U-shaped iron core. The moving contact assembly includes a moving conductive rod, a moving contact piece, and a moving side U-shaped iron core.

[0004] However, for a bipolar longitudinal magnetic contact structure with an iron core, during the opening process, the magnetic field generated by the contacts at a small spacing is too strong, which will cause the local arc to be too concentrated, which will hinder the successful opening of the vacuum circuit breaker. Summary of the invention

[0005] The object of the present invention is to provide a bipolar longitudinal magnetic contact structure and a vacuum interrupter to solve the problem of excessive concentration of local arcs when the contact spacing is small during the opening process of the existing bipolar longitudinal magnetic contact structure.

[0006] The bipolar longitudinal magnetic contact structure of the present invention adopts the following technical solutions:

[0007] The bipolar longitudinal magnetic contact structure comprises:

[0008] The static contact assembly includes a static conductive rod, a static contact sheet, and a static side U-shaped iron core;

[0009] A moving contact assembly, the moving contact assembly comprising a moving conductive rod, a moving contact piece, and a moving side U-shaped iron core;

[0010] Also includes:

[0011] A moving side iron core support, fixedly connected to the moving side U-shaped iron core, and used to fix the moving side U-shaped iron core to the moving end of the vacuum interrupter;

[0012] The moving contact piece of the moving contact assembly is arranged separately from the moving side U-shaped iron core, and the moving contact piece can realize opening and closing under the drive of the moving conductive rod.

[0013] Beneficial effect: With the above technical solution, since the moving side iron core support is fixedly connected to the moving side U-shaped iron core, the moving side U-shaped iron core can be fixed at the moving end of the vacuum arc extinguishing chamber. When opening the gate, only the moving contact piece in the moving side contact assembly moves, and the moving side U-shaped iron core is fixed. Therefore, the spacing between the moving side U-shaped iron core and the static side U-shaped iron core does not change with the change of the contact opening distance. Therefore, the bipolar longitudinal magnetic field generated by the static side U-shaped iron core and the moving side U-shaped iron core during the whole opening process remains basically unchanged, and the arc is effectively controlled under the condition of meeting the large opening distance. While meeting the magnetic field requirement, it can avoid the local concentration of arc caused by excessive bipolar longitudinal magnetic field under small opening distance, improve the control effect of bipolar longitudinal magnetic field on arc in the whole opening process, and help to improve the breaking capacity of vacuum arc extinguishing chamber with bipolar longitudinal magnetic contact with fixed iron core; moreover, the moving parts in the opening are only the moving contact piece and the moving conductive rod, which reduces the moving mass and can reduce the demand for operating work of the circuit breaker operating mechanism, which is beneficial to improve the breaking capacity of vacuum arc extinguishing chamber with bipolar longitudinal magnetic contact with fixed iron core.

[0014] As a preferred technical solution: the moving side core support is a support rod, and one end of the moving side core support away from the moving side U-shaped core is used to support the moving side cover plate of the vacuum arc extinguishing chamber.

[0015] Beneficial effects: By adopting the above technical solution, the support rod has a simple structure, low cost and convenient manufacturing.

[0016] As a preferred technical solution: two support rods are provided, which are respectively supported at the two ends of the U-shaped opening of the moving side U-shaped iron core.

[0017] Beneficial effects: The above technical solution can form a stable support for the U-shaped iron core on the moving side with good reliability.

[0018] As a preferred technical solution: the longitudinal section of the moving contact piece is U-shaped, and the U-shaped opening faces away from the static contact piece; when the moving contact assembly is in the open state, the moving side U-shaped iron core is completely located in the inner cavity of the moving contact piece, or a part of the moving side U-shaped iron core is located in the inner cavity of the moving contact piece.

[0019] Beneficial effects: The above technical solution has a compact structure and can match different contact sheet structures.

[0020] As a preferred technical solution: the openings of the static side U-shaped iron core and the dynamic side U-shaped iron core are oriented in opposite directions.

[0021] As a preferred technical solution: the moving side iron core support is made of metal and is used for welding and fixing on the moving side cover plate of the vacuum arc extinguishing chamber.

[0022] Beneficial effects: The adoption of the above technical solution is conducive to ensuring the structural strength of the moving-side iron core support, and can achieve convenient and reliable connection through welding.

[0023] As a preferred technical solution: the moving side iron core support is made of insulating material.

[0024] As a preferred technical solution: the static contact piece is welded and fixed on the end face of the static conductive rod.

[0025] Beneficial effects: The above technical solution is reliable in connection and easy to assemble.

[0026] As a preferred technical solution: the moving contact piece is welded and fixed on the end face of the moving conductive rod.

[0027] Beneficial effects: The above technical solution is reliable in connection and easy to assemble.

[0028] The vacuum interrupter of the present invention adopts the following technical solution:

[0029] Vacuum interrupter, including:

[0030] The arc extinguishing chamber housing has a static side cover plate and a dynamic side cover plate at both axial ends thereof, and a contact assembly is arranged inside, and the contact assembly adopts a bipolar longitudinal magnetic contact structure;

[0031] The bipolar longitudinal magnetic contact structure comprises:

[0032] The static contact assembly includes a static conductive rod, a static contact sheet, and a static side U-shaped iron core;

[0033] A moving contact assembly, the moving contact assembly comprising a moving conductive rod, a moving contact piece, and a moving side U-shaped iron core;

[0034] Also includes:

[0035] A moving side iron core support, fixedly connected to the moving side U-shaped iron core, and used to fix the moving side U-shaped iron core to the moving end of the vacuum interrupter;

[0036] The moving contact piece of the moving contact assembly is arranged separately from the moving side U-shaped iron core, and the moving contact piece can realize opening and closing under the drive of the moving conductive rod.

[0037] Beneficial effect: With the above technical solution, since the moving side iron core support is fixedly connected to the moving side U-shaped iron core, the moving side U-shaped iron core can be fixed at the moving end of the vacuum arc extinguishing chamber. When opening the gate, only the moving contact piece in the moving side contact assembly moves, and the moving side U-shaped iron core is fixed. Therefore, the spacing between the moving side U-shaped iron core and the static side U-shaped iron core does not change with the change of the contact opening distance. Therefore, the bipolar longitudinal magnetic field generated by the static side U-shaped iron core and the moving side U-shaped iron core during the whole opening process remains basically unchanged, and the arc is effectively controlled under the condition of meeting the large opening distance. While meeting the magnetic field requirement, it can avoid the local concentration of arc caused by excessive bipolar longitudinal magnetic field under small opening distance, improve the control effect of bipolar longitudinal magnetic field on arc in the whole opening process, and help to improve the breaking capacity of vacuum arc extinguishing chamber with bipolar longitudinal magnetic contact with fixed iron core; moreover, the moving parts in the opening are only the moving contact piece and the moving conductive rod, which reduces the moving mass and can reduce the demand for operating work of the circuit breaker operating mechanism, which is beneficial to improve the breaking capacity of vacuum arc extinguishing chamber with bipolar longitudinal magnetic contact with fixed iron core.

[0038] As a preferred technical solution: the moving side core support is a support rod, and one end of the moving side core support away from the moving side U-shaped core is used to support the moving side cover plate of the vacuum arc extinguishing chamber.

[0039] Beneficial effects: By adopting the above technical solution, the support rod has a simple structure, low cost and convenient manufacturing.

[0040] As a preferred technical solution: two support rods are provided, which are respectively supported at the two ends of the U-shaped opening of the moving side U-shaped iron core.

[0041] Beneficial effects: The above technical solution can form a stable support for the U-shaped iron core on the moving side with good reliability.

[0042] As a preferred technical solution: the longitudinal section of the moving contact piece is U-shaped, and the U-shaped opening faces away from the static contact piece; when the moving contact assembly is in the open state, the moving side U-shaped iron core is completely located in the inner cavity of the moving contact piece, or a part of the moving side U-shaped iron core is located in the inner cavity of the moving contact piece.

[0043] Beneficial effects: The above technical solution has a compact structure and can match different contact sheet structures.

[0044] As a preferred technical solution: the openings of the static side U-shaped iron core and the dynamic side U-shaped iron core are oriented in opposite directions.

[0045] As a preferred technical solution: the moving side iron core support is made of metal and is used for welding and fixing on the moving side cover plate of the vacuum arc extinguishing chamber.

[0046] Beneficial effects: The adoption of the above technical solution is conducive to ensuring the structural strength of the moving-side iron core support, and can achieve convenient and reliable connection through welding.

[0047] As a preferred technical solution: the moving side iron core support is made of insulating material.

[0048] As a preferred technical solution: the static contact piece is welded and fixed on the end face of the static conductive rod.

[0049] Beneficial effects: The above technical solution is reliable in connection and easy to assemble.

[0050] As a preferred technical solution: the moving contact piece is welded and fixed on the end face of the moving conductive rod.

[0051] Beneficial effects: The above technical solution is reliable in connection and easy to assemble.

[0052] For the subject matter to be protected by this patent, each preferred technical solution under the same subject matter can be adopted separately. When it is possible to combine, two or more preferred technical solutions under the same subject matter can be arbitrarily combined. The technical solution formed by the combination will not be described in detail here, but will be included in the record of this patent in this form. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a structural schematic diagram of embodiment 1 of the vacuum interrupter of the present invention in a closed state;

[0054] Figure 2 It is a structural schematic diagram of the embodiment 1 of the vacuum interrupter of the present invention in the open state;

[0055] Figure 3 yes Figure 1 Structural schematic diagram of the bipolar longitudinal magnetic contact structure;

[0056] Figure 4 yes Figure 3 Stereoscopic image of

[0057] The names of the components corresponding to the corresponding reference numerals in the figure are: 11, arc extinguishing chamber housing; 12, static side cover plate; 13, dynamic side cover plate; 14, static side end shielding cover; 15, dynamic side end shielding cover; 16, main shielding cover; 21, static contact assembly; 22, static conductive rod; 23, static contact piece; 24, static side U-shaped iron core; 31, dynamic contact assembly; 32, dynamic conductive rod; 33, dynamic contact piece; 34, dynamic side U-shaped iron core; 35, dynamic side iron core support; 36, bellows. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0059] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0060] It should be noted that the relational terms such as "first" and "second" that may appear in the specific embodiments of the present invention are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof that may appear are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "includes a ..." that may appear do not exclude the existence of other identical elements in the process, method, article or device that includes the elements.

[0061] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear 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, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the description of the present invention, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] The present invention is further described in detail below in conjunction with embodiments.

[0064] Embodiment 1 of the vacuum interrupter in the present invention:

[0065] like Figure 1 and Figure 2 As shown, the vacuum arc chamber includes an arc chamber shell 11, which is made of a porcelain shell, and its axial ends are respectively welded and fixed to a stationary side cover plate 12 and a moving side cover plate 13. A contact assembly is provided inside the arc chamber shell 11, and the contact assembly adopts a bipolar longitudinal magnetic contact structure.

[0066] The bipolar longitudinal magnetic contact structure includes a stationary contact assembly 21 and a moving contact assembly 31. The stationary contact assembly 21 includes a stationary conductive rod 22, a stationary contact piece 23, and a stationary side U-shaped iron core 24; the moving contact assembly 31 includes a moving conductive rod 32, a moving contact piece 33, and a moving side U-shaped iron core 34. The longitudinal sections of the stationary contact piece 23 and the moving contact piece 33 are both U-shaped, and the U-shaped openings of the two are facing opposite directions. The back of the radial center of the stationary contact piece 23 is welded and fixed on the end face of the stationary conductive rod 22, and the back of the radial center of the moving contact piece 33 is welded and fixed on the end face of the moving conductive rod 32. The specific structure of the stationary contact piece 23 and the moving contact piece 33 is the existing technology, which is used to form a bipolar longitudinal magnetic contact and will not be described in detail here.

[0067] The axial middle part of the static conductive rod 22 is welded and fixed to the static side cover plate 12, and a static side end shielding cover 14 is also welded and fixed to the inner side of the static side cover plate 12 in the arc extinguishing chamber housing 11. The axial middle part of the static conductive rod 22 is welded and fixed to one end of the bellows 36, and the other end of the bellows 36 is welded and fixed to the moving side cover plate 13, and a moving side end shielding cover 15 is also welded and fixed to the inner side of the moving side cover plate 13 in the arc extinguishing chamber housing 11. In addition, a main shielding cover 16 is also provided at the junction of the static contact assembly 21 and the moving contact assembly 31, and the main shielding cover 16 is welded and fixed to the axial middle part of the arc extinguishing chamber housing 11.

[0068] As a prior art, the U-shaped openings of the static side U-shaped core 24 and the dynamic side U-shaped core 34 face opposite directions and are arranged at 180 degrees. The static side U-shaped core 24 and the dynamic side U-shaped core 34 can be made of magnetic conductive materials such as electrical pure iron. The static side U-shaped core 24 is welded and fixed to the back of the static side U-shaped core 24 and is completely located in the inner cavity of the static contact piece 23. The dynamic side U-shaped core and the dynamic contact piece 33 are arranged separately. The dynamic side U-shaped core 34 is welded and fixed to one end of the dynamic side core support 35, and the other end of the dynamic side core support 35 is welded and fixed to the dynamic side cover plate 13, which is used to support and fix the dynamic side U-shaped core 34 to the dynamic end of the vacuum arc chamber. When the dynamic contact assembly 31 is in the open state, the dynamic side U-shaped core 34 is completely located in the inner cavity of the dynamic contact piece 33.

[0069] like Figure 3 and Figure 4 The moving side core support 35 is a support rod, and two support rods are provided, which are respectively supported at the two ends of the U-shaped opening of the moving side U-shaped core 34, and the plane where the two support rods are located passes through the axis of the moving contact rod. In order to ensure working stability and convenient assembly, the moving side core support 35 is made of metal with high mechanical strength, which is easy to weld.

[0070] Similar to the structure in the prior art, the thickness of the static side U-shaped core 24 and the dynamic side U-shaped core 34 gradually increases from the opening side to the other side. Of course, the static side U-shaped core 24 and the dynamic side U-shaped core 34 can also be other shapes, such as horseshoe shape, or other shapes with a U-shape and a slotted structure in the center.

[0071] When in use, during the arcing process of the opening switch, current flows through the static contact piece 23 and the moving contact piece 33, and the static side U-shaped iron core 24 and the moving side U-shaped iron core 34 generate bipolar longitudinal magnetic fields of equal size and opposite polarity on both sides of the U-shaped slot. The magnetic field corresponds to the head gap and acts on the vacuum arc column, which can suppress the aggregation tendency of the vacuum arc column. During the contact opening process, since only the moving contact piece 33 moves in the moving side contact assembly, and the moving side U-shaped iron core 34 is fixed, the spacing between the moving side U-shaped iron core 34 and the static side U-shaped iron core 24 does not change with the contact opening distance. Therefore, the bipolar longitudinal magnetic field generated by the static side U-shaped iron core 24 and the moving side U-shaped iron core 34 remains basically unchanged during the entire opening process. While meeting the magnetic field requirements for effectively controlling the arc under a large opening distance, it can avoid the local concentration of the arc caused by the excessive bipolar longitudinal magnetic field under a small opening distance, thereby improving the control effect of the bipolar longitudinal magnetic field on the arc during the entire opening process, and helping to improve the breaking capacity of the vacuum arc extinguishing chamber with a bipolar longitudinal magnetic contact with a fixed iron core; in addition, the moving parts in the opening process are only the moving contact piece 33 and the moving conductive rod 32, which reduces the moving mass and can reduce the demand for the operating work of the circuit breaker operating mechanism, which is beneficial to improving the breaking capacity of the vacuum arc extinguishing chamber with a bipolar longitudinal magnetic contact with a fixed iron core.

[0072] Embodiment 2 of the vacuum interrupter in the present invention:

[0073] The difference between this embodiment and the first embodiment is that in the first embodiment, the moving side iron core support 35 is a support rod, while in this embodiment, the moving side iron core support 35 is a support tube, which is fixed to the inner side of the moving side cover plate 13, and the moving conductive rod 32 passes through the support tube. In other embodiments, the moving side iron core support 35 may also be in other forms, such as a frame form; in addition, in other embodiments, the number of support rods may be only one, or more than three.

[0074] Embodiment 3 of the vacuum interrupter in the present invention:

[0075] The difference between this embodiment and embodiment 1 is that in embodiment 1, the support rod is welded and fixed to the moving side cover plate 13, while in this embodiment, the end of the support rod is provided with a flange structure, which is assembled and fixed to the moving end cover plate through the flange structure.

[0076] Embodiment 4 of the vacuum interrupter in the present invention:

[0077] The difference between this embodiment and embodiment 1 is that in embodiment 1, the support rod is fixed on the moving side cover plate 13, while in this embodiment, the support rod is welded and fixed on the inner wall of the arc extinguishing chamber shell.

[0078] Embodiment 5 of the vacuum interrupter in the present invention:

[0079] The difference between this embodiment and embodiment 1 is that in embodiment 1, the longitudinal section of the moving contact piece 33 is U-shaped, while in this embodiment, the moving contact piece 33 is a flat sheet structure, specifically the structure adopted in the patent document with publication number CN107093535B.

[0080] In the above embodiment, the moving side iron core support 35 is welded and fixed on the moving side U-shaped iron core 34; in other embodiments, the moving side iron core support 35 may also be fixed in other ways, such as threaded connection or adhesive fixation. In the above embodiment, when the moving contact assembly 31 is in the open state, the moving side U-shaped iron core 34 is completely located in the inner cavity of the moving contact piece 33; in other embodiments, when the moving side U-shaped iron core 34 is open, only a part of it may be located in the inner cavity of the moving contact piece 33.

[0081] An embodiment of the bipolar longitudinal magnetic contact structure in the present invention: An embodiment of the bipolar longitudinal magnetic contact structure is the bipolar longitudinal magnetic contact structure recorded in any embodiment of the above-mentioned vacuum arc extinguishing chamber, which will not be described in detail here.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. Bipolar longitudinal magnetic contact structure, including: The static contact assembly includes a static conductive rod, a static contact sheet, and a static side U-shaped iron core; A moving contact assembly, the moving contact assembly comprising a moving conductive rod, a moving contact piece, and a moving side U-shaped iron core; It is characterized by further comprising: A moving side iron core support, fixedly connected to the moving side U-shaped iron core, and used to fix the moving side U-shaped iron core to the moving end of the vacuum interrupter; The moving contact piece of the moving contact assembly is arranged separately from the moving side U-shaped iron core, and the moving contact piece can realize opening and closing under the drive of the moving conductive rod; The longitudinal sections of the static contact piece and the moving contact piece are both U-shaped and their openings are facing opposite directions. The radial center back side of the static contact piece is fixed on the end face of the static conductive rod, and the radial center back side of the moving contact piece is fixed on the end face of the moving conductive rod. When the moving contact assembly is in the open state, the moving side U-shaped iron core is completely located in the inner cavity of the moving contact piece, or a part of the moving side U-shaped iron core is located in the inner cavity of the moving contact piece.

2. The bipolar longitudinal magnetic contact structure according to claim 1, characterized in that: The moving side iron core support is a support rod, and one end of the moving side iron core support away from the moving side U-shaped iron core is used to support on the moving side cover plate of the vacuum interrupter.

3. The bipolar longitudinal magnetic contact structure according to claim 2 is characterized in that: There are two support rods, which are respectively supported at two ends of the U-shaped opening of the moving side U-shaped iron core.

4. The bipolar longitudinal magnetic contact structure according to claim 1, 2 or 3, characterized in that: The openings of the stationary side U-shaped iron core and the moving side U-shaped iron core are oriented in opposite directions.

5. The bipolar longitudinal magnetic contact structure according to claim 1, 2 or 3, characterized in that: The moving side iron core support is made of metal and is used for welding and fixing on the moving side cover plate of the vacuum arc extinguishing chamber.

6. The bipolar longitudinal magnetic contact structure according to claim 1, 2 or 3, characterized in that: The moving side iron core support is made of insulating material.

7. The bipolar longitudinal magnetic contact structure according to claim 1, 2 or 3, characterized in that: The static contact piece is welded and fixed on the end surface of the static conductive rod.

8. The bipolar longitudinal magnetic contact structure according to claim 1 or 2, characterized in that: The moving contact piece is welded and fixed on the end surface of the moving conductive rod.

9. Vacuum interrupter, including: The arc extinguishing chamber housing has a static side cover plate and a dynamic side cover plate at both axial ends thereof, and a contact assembly is arranged inside, and the contact assembly adopts a bipolar longitudinal magnetic contact structure; It is characterized in that the bipolar longitudinal magnetic contact structure is the bipolar longitudinal magnetic contact structure described in any one of claims 1 to 8.

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