阅读说明：本技术 双极纵磁触头结构及真空灭弧室 (Bipolar longitudinal magnetic contact structure and vacuum arc-extinguishing chamber ) 是由 王俊 章启峰 马朝阳 王子寒 李旭旭 王建华 孙广雷 赵晓民 刘庆 何创伟 李永 于 2021-07-05 设计创作，主要内容包括：本发明涉及双极纵磁触头结构及真空灭弧室。双极纵磁触头结构,包括：静触头组件,静触头组件包括静导电杆、静触头片、静侧U形铁芯；动触头组件,动触头组件包括动导电杆、动触头片、动侧U形铁芯；还包括：动侧铁芯支撑件,与动侧U形铁芯固定连接,用于将动侧U形铁芯固定在真空灭弧室的动端；所述动触头组件的动触头片与动侧U形铁芯分体布置,动触头片能够在动导电杆的带动下实现分合闸。上述方案能够解决现有的双极纵磁触头结构分闸过程中触头间距较小时局部电弧过于集中的问题。(The invention relates to a bipolar longitudinal magnetic contact structure and a vacuum arc-extinguishing chamber. A bipolar longitudinal magnetic contact structure comprising: the static contact component comprises a static conductive rod, a static contact blade and a static side U-shaped iron core; the moving contact component comprises a moving conducting rod, a moving contact blade and a moving side U-shaped iron core; further comprising: the movable side iron core supporting piece is fixedly connected with the movable side U-shaped iron core and is used for fixing the movable side U-shaped iron core at the movable end of the vacuum arc-extinguishing chamber; the movable contact piece of the movable contact component and the movable side U-shaped iron core are arranged in a split mode, and the movable contact piece can be driven by the movable conducting rod to be switched on and off. By means of the technical scheme, the problem that local electric arcs are too concentrated when the contact distance is small in the existing bipolar longitudinal magnetic contact structure opening process can be solved.)

1. A bipolar longitudinal magnetic contact structure comprising:

the static contact assembly (21), the static contact assembly (21) includes the static conducting rod (22), the static contact piece (23), the static side U-shaped iron core (24);

the moving contact component (31), the moving contact component (31) includes moving conducting rod (32), moving contact piece (33), moving side U-shaped iron core (34);

it is characterized by also comprising:

the movable side iron core supporting piece (35) is fixedly connected with the movable side U-shaped iron core (34) and is used for fixing the movable side U-shaped iron core (34) at the movable end of the vacuum arc-extinguishing chamber;

a moving contact piece (33) of the moving contact component (31) and the moving side U-shaped iron core (34) are arranged in a split mode, and the moving contact piece (33) can be driven by the moving conductive rod (32) to be switched on and off.

2. The structure of a bipolar longitudinal magnetic contact according to claim 1, wherein the moving-side core support member (35) is a support rod, and one end of the moving-side core support member (35) away from the moving-side U-shaped core (34) is used for supporting on a moving-side cover plate (13) of the vacuum interrupter.

3. A bipolar longitudinal magnetic contact structure according to claim 2, wherein two support rods are provided, each supported at both ends of the U-shaped opening of the movable side U-shaped iron core (34).

4. A bipolar longitudinal magnetic contact structure according to claim 1, 2 or 3, characterized in that the longitudinal section of the movable contact blade (33) is U-shaped, the opening of the U facing away from the stationary contact blade (23); when the movable contact assembly (31) is in a brake-off state, the movable side U-shaped iron core (34) is completely positioned in the inner cavity of the movable contact blade (33), or one part of the movable side U-shaped iron core (34) is positioned in the inner cavity of the movable contact blade (33).

5. A bipolar longitudinal magnetic contact structure according to claim 1, 2 or 3, characterized in that the openings of the stationary side U-shaped core (24) and the moving side U-shaped core (34) are oriented oppositely.

6. The structure of a bipolar longitudinal magnetic contact according to claim 1, 2 or 3, characterized in that the moving-side core support (35) is made of metal and is welded and fixed on a moving-side cover plate (13) of the vacuum interrupter.

7. A bipolar longitudinal magnetic contact structure according to claim 1, 2 or 3, characterized in that the moving-side core support (35) is of an insulating material.

8. The structure of a bipolar longitudinal magnetic contact according to claim 1, 2 or 3, characterized in that the stationary contact blades (23) are welded and fixed to the end faces of the stationary conductive bars (22).

9. The bipolar longitudinal magnetic contact structure according to claim 1 or 2, wherein the movable contact blade (33) is welded and fixed on the end face of the movable conductive rod (32).

10. Vacuum interrupter, includes:

the arc extinguishing chamber comprises an arc extinguishing chamber shell (11), wherein a static side cover plate (12) and a moving side cover plate (13) are respectively arranged at two axial ends of the arc extinguishing chamber shell (11), a contact component is arranged in the arc extinguishing chamber shell, and the contact component adopts a bipolar longitudinal magnetic contact structure;

the bipolar longitudinal magnetic contact structure is according to any one of claims 1 to 9.

Technical Field

The invention relates to a bipolar longitudinal magnetic contact structure and a vacuum arc-extinguishing chamber.

Background

Vacuum circuit breakers are widely used in alternating current networks in the medium and low voltage field due to their advantages of high reliability, environmental friendliness, and the like. The vacuum arc-extinguishing chamber as its core component affects whether the vacuum circuit breaker is successfully opened or not. At present, in order to improve the short-circuit current breaking capability of a vacuum arc-extinguishing chamber, a magnetic field control technology of a vacuum arc is generally adopted, and the magnetic field control technology mainly comprises a transverse magnetic field control technology and a longitudinal magnetic field control technology. For example, chinese patent publication No. CN110379670B discloses a description in the background art of a high current capacity vacuum interrupter with a fixed break, in which a lateral magnetic field technology is used to form a lateral magnetic field perpendicular to the arc current flow in the contact and the contact gap region thereof through a specific contact structure in a current path formed during the arcing process. The transverse magnetic field acts on the vacuum arc to drive the vacuum arc to rotate on the surface of the contact, so that the partial excessive ablation of the contact by the arc is avoided, and the breaking capacity of the switch is improved. The longitudinal magnetic field technology is that a magnetic field parallel to the current flow direction of an arc is formed through a contact structure, so that vacuum arc is diffused and uniformly burnt, the concentration of the vacuum arc is reduced, the partial ablation of the arc on the surface of the contact is reduced, and the breaking capacity of a switch is improved.

For a longitudinal magnetic contact, a strong magnetic field can still be kept under a large opening distance, the breaking capacity is strong, but the contact structure is complex, the loop resistance is large, and the rated current carrying capacity is low; for the transverse magnetic contact, the loop resistance is small, but the magnetic field is weak under large opening distance, and the short-circuit current breaking capacity is low. In the high-current breaking of a higher voltage level, the contact spacing is often higher, and the longitudinal magnetic field can still effectively inhibit electric arc concentration under the condition that the contact spacing is larger, so that the breaking capacity of the vacuum circuit breaker is improved, and the vacuum arc-extinguishing chamber usually adopts a longitudinal magnetic contact structure under the higher voltage level, namely the contact structure capable of generating the longitudinal magnetic field. The conventional longitudinal magnetic contact structure is a high-rated-current longitudinal magnetic field vacuum arc-extinguishing chamber contact structure disclosed in patent document with publication number CN107093535B, and the contact structure adopted by the longitudinal magnetic sector core type contact assembly disclosed in patent document with publication number CN107993882B is a bipolar longitudinal magnetic contact structure with an iron core. The bipolar longitudinal magnetic contact structure comprises a static contact component and a moving contact component, wherein the static contact component comprises a static conducting rod, a static contact piece and a static side U-shaped iron core, and the moving contact component comprises a moving conducting rod, a moving contact piece and a moving side U-shaped iron core.

However, in the case of a bipolar longitudinal magnetic contact structure with an iron core, the magnetic field generated by the contact at a small distance during opening is too strong, which may result in too concentrated local arcs, which may prevent the vacuum circuit breaker from being successfully opened.

Disclosure of Invention

The invention aims to provide a bipolar longitudinal magnetic contact structure and a vacuum arc-extinguishing chamber, and solves the problem that local electric arcs are too concentrated when the contact distance is small in the existing bipolar longitudinal magnetic contact structure in the brake-opening process.

The bipolar longitudinal magnetic contact structure adopts the following technical scheme:

a bipolar longitudinal magnetic contact structure comprising:

the static contact component comprises a static conductive rod, a static contact blade and a static side U-shaped iron core;

the moving contact component comprises a moving conducting rod, a moving contact blade and a moving side U-shaped iron core;

further comprising:

the movable side iron core supporting piece is fixedly connected with the movable side U-shaped iron core and is used for fixing the movable side U-shaped iron core at the movable end of the vacuum arc-extinguishing chamber;

the movable contact piece of the movable contact component and the movable side U-shaped iron core are arranged in a split mode, and the movable contact piece can be driven by the movable conducting rod to be switched on and off.

Has the advantages that: by adopting the technical scheme, the movable side iron core supporting piece is fixedly connected with the movable side U-shaped iron core, the movable side U-shaped iron core can be fixed at the movable end of the vacuum arc-extinguishing chamber, only the movable contact piece moves in the movable side contact assembly during brake opening, and the movable side U-shaped iron core is fixed, so that the distance between the movable side U-shaped iron core and the static side U-shaped iron core is not changed along with the change of the opening distance of the contact, and therefore, a bipolar longitudinal magnetic field generated by the static side U-shaped iron core and the movable side U-shaped iron core in the whole brake opening process is basically kept unchanged, the local concentration of electric arcs caused by the excessively strong bipolar longitudinal magnetic field in the small opening distance can be avoided while the requirement of effectively controlling the electric arcs in the large opening distance is met, the control effect of the bipolar longitudinal magnetic field on the electric arcs in the whole brake opening process is improved, and the breaking capacity of the vacuum arc-extinguishing chamber with the bipolar longitudinal magnetic contact with the fixed iron core is improved; and the moving parts in the opening are only the moving contact blade and the moving conducting rod, so that the moving mass is reduced, the requirement on the operating power of the circuit breaker operating mechanism can be reduced, and the opening and closing capacity of the vacuum arc-extinguishing chamber with the bipolar longitudinal magnetic contact with the fixed iron core is improved.

As a preferred technical scheme: the movable side iron core supporting piece is a supporting rod, and one end, far away from the movable side U-shaped iron core, of the movable side iron core supporting piece is used for being supported on a movable side cover plate of the vacuum arc-extinguishing chamber.

Has the advantages that: by adopting the technical scheme, the supporting rod is simple in structure, low in cost and convenient to manufacture.

As a preferred technical scheme: the two support rods are respectively supported at two ends of the U-shaped opening of the movable side U-shaped iron core.

Has the advantages that: by adopting the technical scheme, the movable side U-shaped iron core can form stable support and has good reliability.

As a preferred technical scheme: the longitudinal section of the movable contact blade is U-shaped, and the opening of the U-shaped is back to the fixed contact blade; when the moving contact assembly is in a brake separating state, the moving side U-shaped iron core is completely positioned in the inner cavity of the moving contact blade, or one part of the moving side U-shaped iron core is positioned in the inner cavity of the moving contact blade.

Has the advantages that: by adopting the technical scheme, the structure is compact, and different contact blade structures can be matched.

As a preferred technical scheme: the opening directions of the static side U-shaped iron core and the dynamic side U-shaped iron core are opposite.

As a preferred technical scheme: and the movable side iron core supporting piece is made of metal and is used for being welded and fixed on a movable side cover plate of the vacuum arc extinguish chamber.

Has the advantages that: by adopting the technical scheme, the structural strength of the movable side iron core supporting piece is favorably ensured, and convenient and reliable connection can be realized through welding.

As a preferred technical scheme: the movable side iron core supporting piece is made of an insulating material.

As a preferred technical scheme: and the static contact piece is welded and fixed on the end surface of the static conducting rod.

Has the advantages that: adopt above-mentioned technical scheme to connect reliably, the equipment of being convenient for.

As a preferred technical scheme: the moving contact piece is welded and fixed on the end surface of the moving conducting rod.

Has the advantages that: adopt above-mentioned technical scheme to connect reliably, the equipment of being convenient for.

The vacuum arc-extinguishing chamber adopts the following technical scheme:

vacuum interrupter, includes:

the arc extinguishing chamber comprises an arc extinguishing chamber shell, wherein a static side cover plate and a moving side cover plate are respectively arranged at two axial ends of the arc extinguishing chamber shell, a contact component is arranged in the arc extinguishing chamber shell, and the contact component adopts a bipolar longitudinal magnetic contact structure;

a bipolar longitudinal magnetic contact structure comprising:

the static contact component comprises a static conductive rod, a static contact blade and a static side U-shaped iron core;

the moving contact component comprises a moving conducting rod, a moving contact blade and a moving side U-shaped iron core;

further comprising:

the movable side iron core supporting piece is fixedly connected with the movable side U-shaped iron core and is used for fixing the movable side U-shaped iron core at the movable end of the vacuum arc-extinguishing chamber;

the movable contact piece of the movable contact component and the movable side U-shaped iron core are arranged in a split mode, and the movable contact piece can be driven by the movable conducting rod to be switched on and off.

Has the advantages that: by adopting the technical scheme, the movable side iron core supporting piece is fixedly connected with the movable side U-shaped iron core, the movable side U-shaped iron core can be fixed at the movable end of the vacuum arc-extinguishing chamber, only the movable contact piece moves in the movable side contact assembly during brake opening, and the movable side U-shaped iron core is fixed, so that the distance between the movable side U-shaped iron core and the static side U-shaped iron core is not changed along with the change of the opening distance of the contact, and therefore, a bipolar longitudinal magnetic field generated by the static side U-shaped iron core and the movable side U-shaped iron core in the whole brake opening process is basically kept unchanged, the local concentration of electric arcs caused by the excessively strong bipolar longitudinal magnetic field in the small opening distance can be avoided while the requirement of effectively controlling the electric arcs in the large opening distance is met, the control effect of the bipolar longitudinal magnetic field on the electric arcs in the whole brake opening process is improved, and the breaking capacity of the vacuum arc-extinguishing chamber with the bipolar longitudinal magnetic contact with the fixed iron core is improved; and the moving parts in the opening are only the moving contact blade and the moving conducting rod, so that the moving mass is reduced, the requirement on the operating power of the circuit breaker operating mechanism can be reduced, and the opening and closing capacity of the vacuum arc-extinguishing chamber with the bipolar longitudinal magnetic contact with the fixed iron core is improved.

As a preferred technical scheme: the movable side iron core supporting piece is a supporting rod, and one end, far away from the movable side U-shaped iron core, of the movable side iron core supporting piece is used for being supported on a movable side cover plate of the vacuum arc-extinguishing chamber.

Has the advantages that: by adopting the technical scheme, the supporting rod is simple in structure, low in cost and convenient to manufacture.

As a preferred technical scheme: the two support rods are respectively supported at two ends of the U-shaped opening of the movable side U-shaped iron core.

Has the advantages that: by adopting the technical scheme, the movable side U-shaped iron core can form stable support and has good reliability.

As a preferred technical scheme: the longitudinal section of the movable contact blade is U-shaped, and the opening of the U-shaped is back to the fixed contact blade; when the moving contact assembly is in a brake separating state, the moving side U-shaped iron core is completely positioned in the inner cavity of the moving contact blade, or one part of the moving side U-shaped iron core is positioned in the inner cavity of the moving contact blade.

Has the advantages that: by adopting the technical scheme, the structure is compact, and different contact blade structures can be matched.

As a preferred technical scheme: the opening directions of the static side U-shaped iron core and the dynamic side U-shaped iron core are opposite.

As a preferred technical scheme: and the movable side iron core supporting piece is made of metal and is used for being welded and fixed on a movable side cover plate of the vacuum arc extinguish chamber.

Has the advantages that: by adopting the technical scheme, the structural strength of the movable side iron core supporting piece is favorably ensured, and convenient and reliable connection can be realized through welding.

As a preferred technical scheme: the movable side iron core supporting piece is made of an insulating material.

As a preferred technical scheme: and the static contact piece is welded and fixed on the end surface of the static conducting rod.

Has the advantages that: adopt above-mentioned technical scheme to connect reliably, the equipment of being convenient for.

As a preferred technical scheme: the moving contact piece is welded and fixed on the end surface of the moving conducting rod.

Has the advantages that: adopt above-mentioned technical scheme to connect reliably, the equipment of being convenient for.

For the subject to be protected by the present patent, each preferred technical solution under the same subject may be adopted alone, and when the preferred technical solutions under the same subject can be combined, two or more preferred technical solutions under the same subject may be arbitrarily combined, and the technical solutions formed by the combination are not specifically described here, and are included in the description of the present patent in this form.

Drawings

Fig. 1 is a schematic structural diagram of a vacuum interrupter in an embodiment 1 of the present invention in a closing state;

FIG. 2 is a schematic structural diagram of embodiment 1 of the vacuum interrupter in an open state according to the present invention;

FIG. 3 is a schematic diagram of the configuration of the bipolar longitudinal magnetic contact of FIG. 1;

FIG. 4 is a perspective view of FIG. 3;

the names of the components corresponding to the corresponding reference numerals in the drawings are: 11. an arc extinguishing chamber housing; 12. a stationary side cover plate; 13. a movable side cover plate; 14. a stationary-side end shield; 15. a movable side end shield; 16. a main shield case; 21. a stationary contact assembly; 22. a static conductive rod; 23. a stationary contact blade; 24. a stationary side U-shaped iron core; 31. a moving contact assembly; 32. a movable conductive rod; 33. a movable contact blade; 34. a movable side U-shaped iron core; 35. a movable side iron core supporting piece; 36. a bellows.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, which may be present in the embodiments of the present invention, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the statement that "comprises an … …" is intended to indicate that there are additional elements of the same process, method, article, or apparatus that comprise the element.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

In the description of the present invention, unless otherwise specifically stated or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" 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 detachable or non-detachable. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

The present invention will be described in further detail with reference to examples.

Example 1 of the vacuum interrupter of the present invention:

as shown in fig. 1 and 2, the vacuum arc-extinguishing chamber includes an arc-extinguishing chamber housing 11, the arc-extinguishing chamber housing 11 is made of a ceramic shell, two axial ends of the ceramic shell are respectively welded and fixed with a stationary side cover plate 12 and a moving side cover plate 13, a contact assembly is arranged inside the arc-extinguishing chamber housing 11, and the contact assembly is of a bipolar longitudinal magnetic contact structure.

The bipolar longitudinal magnetic contact structure comprises a fixed contact assembly 21 and a movable contact assembly 31. The fixed contact component 21 comprises a fixed conducting rod 22, a fixed contact piece 23 and a fixed side U-shaped iron core 24; the movable contact assembly 31 comprises a movable conducting rod 32, a movable contact blade 33 and a movable side U-shaped iron core 34. The longitudinal sections of the static contact blade 23 and the movable contact blade 33 are U-shaped, and the U-shaped openings of the static contact blade and the movable contact blade are opposite in direction. The back of the radial center of the stationary contact blade 23 is welded and fixed on the end surface of the stationary conductive rod 22, and the back of the radial center of the movable contact blade 33 is welded and fixed on the end surface of the movable conductive rod 32. The specific structure of the stationary contact blade 23 and the movable contact blade 33 is the prior art and is used for forming the bipolar longitudinal magnetic contact, and the detailed description is omitted here.

The axial middle part of the static conducting rod 22 is welded and fixed with the static side cover plate 12, and a static side end shield 14 is also welded and fixed on the inner side of the static side cover plate 12 in the arc extinguish chamber shell 11. The axial middle part of the static conductive rod 22 is welded and fixed with one end of the corrugated pipe 36, the other end of the corrugated pipe 36 is welded and fixed on the movable side cover plate 13, and a movable side end part shielding cover 15 is welded and fixed on the inner side of the movable side cover plate 13 in the arc extinguish chamber shell 11. In addition, a main shielding cover 16 is further arranged at the joint of the fixed contact assembly 21 and the movable contact assembly 31, and the main shielding cover 16 is welded and fixed at the axial middle part of the arc extinguishing chamber shell 11.

As a prior art, the U-shaped openings of the stationary side U-shaped iron core 24 and the moving side U-shaped iron core 34 are oppositely oriented and arranged at 180 °. The stationary side U-shaped iron core 24 and the movable side U-shaped iron core 34 can be made of magnetic conductive materials such as electrician pure iron, and the stationary side U-shaped iron core 24 is welded and fixed on the back of the stationary side U-shaped iron core 24 and is completely positioned in the inner cavity of the stationary contact blade 23. The movable side U-shaped iron core and the movable contact blade 33 are arranged in a split mode, the movable side U-shaped iron core 34 is fixedly welded at one end of a movable side iron core supporting piece 35, the other end of the movable side iron core supporting piece 35 is fixedly welded on the movable side cover plate 13 and used for supporting and fixing the movable side U-shaped iron core 34 at the movable end of the vacuum arc-extinguishing chamber. When the movable contact assembly 31 is in the opening state, the movable side U-shaped iron core 34 is completely positioned in the inner cavity of the movable contact blade 33.

As shown in fig. 3 and 4, the movable-side iron core supporting piece 35 is a supporting rod, two supporting rods are provided, and are respectively supported at two ends of the U-shaped opening of the movable-side U-shaped iron core 34, and the plane where the two supporting rods are located passes through the axis of the movable contact rod. In order to ensure the working stability and the convenience of assembly, the movable side iron core supporting piece 35 is made of a metal material with high mechanical strength, so that the welding is facilitated.

Similar to the structure in the prior art, the thicknesses of the stationary-side U-shaped iron core 24 and the movable-side U-shaped iron core 34 are gradually increased from the opening side to the other side. Of course, the stationary side U-shaped core 24 and the moving side U-shaped core 34 may have other shapes, such as a horseshoe shape, or other shapes having an approximately U-shape with a slotted structure at the center.

When the device is used, in the process of brake-separating arcing, current passes through the static contact pieces 23 and the moving contact pieces 33, the static side U-shaped iron core 24 and the moving side U-shaped iron core 34 generate bipolar longitudinal magnetic fields with the same size and opposite polarities on two sides of the U-shaped notch, the magnetic fields correspond to the head gaps and act on the vacuum arc column, and the gathering tendency of the vacuum arc column can be inhibited. In the process of opening the contact, only the movable contact blade 33 moves in the movable side contact assembly, and the movable side U-shaped iron core 34 is fixed and fixed, so that the distance between the movable side U-shaped iron core 34 and the fixed side U-shaped iron core 24 is not changed along with the change of the opening distance of the contact, and the bipolar longitudinal magnetic field generated by the fixed side U-shaped iron core 24 and the movable side U-shaped iron core 34 in the whole opening process is basically kept unchanged, so that the requirement of effectively controlling the magnetic field of the electric arc under large opening distance is met, the local concentration of the electric arc caused by the over-strong bipolar longitudinal magnetic field under small opening distance can be avoided, the control effect of the bipolar longitudinal magnetic field on the electric arc in the whole opening process is improved, and the opening and closing capacity of a vacuum arc-extinguishing chamber with the bipolar longitudinal magnetic contact of the fixed iron core is improved; in addition, the moving parts in the opening are only the moving contact blade 33 and the moving conducting rod 32, so that the moving mass is reduced, the requirement on the operating power of the circuit breaker operating mechanism can be reduced, and the opening and closing capacity of the vacuum arc-extinguishing chamber with the bipolar longitudinal magnetic contact with the fixed iron core is improved.

Example 2 of the vacuum interrupter of the present invention:

the present embodiment is different from embodiment 1 in that in embodiment 1, the movable-side core support 35 is a support rod, and in this embodiment, the movable-side core support 35 is a support cylinder fixed inside the movable-side cover plate 13, and the movable conductive rod 32 passes through the support cylinder. In other embodiments, the movable-side core support 35 may be in other forms, such as a frame form; in addition, in other embodiments, the number of the supporting rods can be only one, or more than three.

Example 3 of the vacuum interrupter of the present invention:

the difference between this embodiment and embodiment 1 is that in embodiment 1, the support rod is welded and fixed on the movable side cover plate 13, while in this embodiment, the end of the support rod is provided with a flange structure, and is assembled and fixed on the movable end cover plate through the flange structure.

Example 4 of the vacuum interrupter of the present invention:

the difference between this embodiment and embodiment 1 is that in embodiment 1, the support rod is fixed on the movable side cover plate 13, and in this embodiment, the support rod is welded and fixed on the inner wall of the arc extinguishing chamber housing.

Example 5 of the vacuum interrupter of the present invention:

the present embodiment is different from embodiment 1 in that in embodiment 1, the longitudinal section of the movable contact blade 33 is U-shaped, whereas in this embodiment, the movable contact blade 33 is of a flat plate-like structure, specifically, the structure adopted in the patent document with publication number CN 107093535B.

In the above embodiment, the movable-side core support 35 is welded and fixed to the movable-side U-core 34; in other embodiments, the movable-side core support 35 may be fixed by other fixing methods, such as screwing, and bonding. In the above embodiment, when the movable contact assembly 31 is in the opening state, the movable side U-shaped iron core 34 is completely located in the inner cavity of the movable contact blade 33; in other embodiments, only a portion of the movable-side U-core 34 may be located in the cavity of the movable contact blade 33 during opening.

The invention discloses an embodiment of a bipolar longitudinal magnetic contact structure: the bipolar longitudinal magnetic contact structure described in the embodiment of the bipolar longitudinal magnetic contact structure, that is, any one of the embodiments of the vacuum interrupter, will not be described in detail here.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.