阅读说明：本技术 一种真空灭弧室及真空断路器 (Vacuum arc extinguish chamber and vacuum circuit breaker ) 是由 李永林 马祥腾 赵晓民 闫静 耿英三 李旭旭 马朝阳 孙广雷 刘庆 毕迎华 杨帆 于 2021-07-05 设计创作，主要内容包括：本发明涉及一种真空灭弧室及真空断路器。真空灭弧室包括：瓷壳,其轴向两端分别设有静侧盖板和动侧盖板；静导电杆,处于瓷壳内并与静侧盖板连接；动导电杆,处于瓷壳内并与动侧盖板连接,动导电杆与静导电杆之间形成断口；静侧端部屏蔽罩,固定在静侧盖板内侧；动侧端部屏蔽罩,固定在动侧盖板内侧；中央主屏蔽罩,罩设在断口处；静侧均压电容组,设置在瓷壳内并绕静导电杆周向布置有多组；动侧均压电容组,设置在瓷壳内并与静侧均压电容组一一对应,动侧均压电容组绕动导电杆周向布置；静侧连接杆,导电连接静侧均压电容组和静侧盖板；动侧连接杆,导电连接动侧均压电容组和动侧盖板；中间连接杆,导电连接动侧均压电容组和静侧均压电容。(The invention relates to a vacuum arc extinguish chamber and a vacuum circuit breaker. The vacuum interrupter includes: the axial two ends of the porcelain shell are respectively provided with a static side cover plate and a dynamic side cover plate; the static conductive rod is positioned in the porcelain shell and is connected with the static side cover plate; the movable conducting rod is positioned in the ceramic shell and connected with the movable side cover plate, and a fracture is formed between the movable conducting rod and the static conducting rod; the static side end part shielding cover is fixed on the inner side of the static side cover plate; the movable side end shielding cover is fixed on the inner side of the movable side cover plate; the central main shielding cover is covered at the fracture; the static side voltage-sharing capacitor groups are arranged in the porcelain shell and are arranged in a plurality of groups around the static conducting rod in the circumferential direction; the movable side voltage-sharing capacitor groups are arranged in the porcelain shell and correspond to the static side voltage-sharing capacitor groups one by one, and the movable side voltage-sharing capacitor groups are arranged around the movable conducting rods in the circumferential direction; the static side connecting rod is in conductive connection with the static side voltage-sharing capacitor group and the static side cover plate; the movable side connecting rod is electrically connected with the movable side voltage-sharing capacitor group and the movable side cover plate; and the middle connecting rod is electrically connected with the movable side voltage-sharing capacitor group and the static side voltage-sharing capacitor.)

1. Vacuum interrupter, its characterized in that includes:

a stationary side cover plate (16) and a movable side cover plate (15) are respectively arranged at two axial ends of the porcelain shell (11);

the static conductive rod (14) is positioned in the porcelain shell (11) and is in conductive connection with the static side cover plate (16);

the movable conducting rod (13) is positioned in the ceramic shell (11) and is in conductive connection with the movable side cover plate (15), and a fracture (25) is formed between the movable conducting rod (13) and the static conducting rod (14);

a stationary-side end shield (17) fixed to the inside of the stationary-side cover (16);

a movable side end shield cover (24) fixed on the inner side of the movable side cover plate (15);

the central main shielding cover (12) is fixed in the porcelain shell (11) and covers the fracture (25);

the static side voltage-sharing capacitor group (19) is arranged in the porcelain shell (11) and is distributed in a plurality of groups around the circumference of the static conducting rod (14), and the static side voltage-sharing capacitor group (19) is positioned between the central main shielding cover (12) and the static side end part shielding cover (17);

the movable side voltage-sharing capacitor groups (22) are arranged in the porcelain shell (11) and correspond to the static side voltage-sharing capacitor groups (19) one by one, and the movable side voltage-sharing capacitor groups (22) are arranged around the circumferential direction of the movable conducting rod (13) and are positioned between the central main shielding cover (12) and the movable side end shielding cover (24);

the static side connecting rod (18) penetrates through the static side end part shielding cover (17) and is in conductive connection with the static side voltage-sharing capacitor bank (19) and the static side cover plate (16);

the movable side connecting rod (23) penetrates through the movable side end shielding cover (24) and is in conductive connection with the movable side voltage-sharing capacitor group (22) and the movable side cover plate (15);

and the middle connecting rod (20) is in conductive connection with the movable side voltage-sharing capacitor group (22) and the static side voltage-sharing capacitor group (19) so that the movable side voltage-sharing capacitor group (22) and the static side voltage-sharing capacitor group (19) are connected in series and then are connected in parallel with the movable conducting rod and the static conducting rod (14).

2. Vacuum interrupter according to claim 1, characterized in that the dynamic side voltage-sharing capacitor bank (22) and the static side voltage-sharing capacitor bank (19) have an overlap with the central main shield (12) in the axial direction of the porcelain shell (11).

3. Vacuum interrupter according to claim 2, characterized in that the intermediate connection rod (20) is arranged against the outer side of the central main shield (12).

4. Vacuum interrupter according to claim 1 or 2 or 3, characterized in that the porcelain shell (11) comprises two sub-shells, the central main shield (12) having a sealing ring (21), the central main shield (12) being fixed inside the porcelain shell (11) by the sealing ring (21); the middle connecting rod (20) is electrically connected with the sealing ring (21).

5. Vacuum interrupter according to claim 1 or 2 or 3, characterized in that the stationary side connecting rod (18) is arranged against the inside of the stationary side end shield (17) and the moving side connecting rod (23) is arranged against the inside of the moving side end shield (24).

6. Vacuum circuit breaker, including casing and the vacuum interrupter who sets up in the casing, its characterized in that, vacuum interrupter includes:

a stationary side cover plate (16) and a movable side cover plate (15) are respectively arranged at two axial ends of the porcelain shell (11);

the static conductive rod (14) is positioned in the porcelain shell (11) and is in conductive connection with the static side cover plate (16);

the movable conducting rod (13) is positioned in the ceramic shell (11) and is in conductive connection with the movable side cover plate (15), and a fracture (25) is formed between the movable conducting rod (13) and the static conducting rod (14);

a stationary-side end shield (17) fixed to the inside of the stationary-side cover (16);

a movable side end shield cover (24) fixed on the inner side of the movable side cover plate (15);

the central main shielding cover (12) is fixed in the porcelain shell (11) and covers the fracture (25);

the static side voltage-sharing capacitor group (19) is arranged in the porcelain shell (11) and is distributed in a plurality of groups around the circumference of the static conducting rod (14), and the static side voltage-sharing capacitor group (19) is positioned between the central main shielding cover (12) and the static side end part shielding cover (17);

the movable side voltage-sharing capacitor groups (22) are arranged in the porcelain shell (11) and correspond to the static side voltage-sharing capacitor groups (19) one by one, and the movable side voltage-sharing capacitor groups (22) are arranged around the circumferential direction of the movable conducting rod (13) and are positioned between the central main shielding cover (12) and the movable side end shielding cover (24);

the static side connecting rod (18) penetrates through the static side end part shielding cover (17) and is in conductive connection with the static side voltage-sharing capacitor bank (19) and the static side cover plate (16);

the movable side connecting rod (23) penetrates through the movable side end shielding cover (24) and is in conductive connection with the movable side voltage-sharing capacitor group (22) and the movable side cover plate (15);

and the middle connecting rod (20) is in conductive connection with the movable side voltage-sharing capacitor group (22) and the static side voltage-sharing capacitor group (19) so that the movable side voltage-sharing capacitor group (22) and the static side voltage-sharing capacitor group (19) are connected in series and then are connected in parallel with the movable conducting rod and the static conducting rod (14).

7. Vacuum circuit breaker according to claim 6, characterized in that the live side voltage-sharing capacitor bank (22) and the static side voltage-sharing capacitor bank (19) each have an overlap with the central main shield (12) in the axial direction of the porcelain shell (11).

8. Vacuum interrupter according to claim 7, characterized in that the intermediate connecting rod (20) is arranged against the outer side of the central main shield (12).

9. Vacuum interrupter according to claim 6 or 7 or 8, characterized in that the porcelain housing (11) comprises two sub-housings, the central main shield (12) having a sealing ring (21), the central main shield (12) being fixed inside the porcelain housing (11) by the sealing ring (21); the middle connecting rod (20) is electrically connected with the sealing ring (21).

10. Vacuum interrupter according to claim 6 or 7 or 8, characterized in that the stationary side connecting rod (18) is arranged in close contact with the inside of the stationary side end shield (17) and the moving side connecting rod (23) is arranged in close contact with the inside of the moving side end shield (24).

Technical Field

The invention relates to a vacuum arc extinguish chamber and a vacuum circuit breaker.

Background

Vacuum circuit breakers are important switchgear for ensuring safe and reliable operation of electrical power networks. The vacuum circuit breaker is generally applied to the on-off of an alternating current power grid in the field of medium and low voltage at present, and has the characteristics of high reliability, no maintenance, strong on-off capability and the like. At present, the voltage class of a single-break vacuum circuit breaker is generally lower than 145kV, and in order to realize the voltage class of 363kV and above, a plurality of single-break arc extinguishing chambers are required to be connected in series to form a multi-break vacuum circuit breaker.

However, due to the existence of stray capacitance, the voltage distribution of each series fracture of the multi-fracture vacuum circuit breaker is uneven, and a vacuum arc-extinguishing chamber with high bearing voltage is easy to break down first, so that the multi-fracture vacuum circuit breaker fails to break. In order to ensure that the voltage distribution of each series-connected fracture is uniform, a uniform capacitor is generally connected in parallel at each vacuum arc-extinguishing chamber, such as a multi-fracture vacuum circuit breaker disclosed in chinese patent application publication No. CN 112382527A.

Since the voltage-sharing capacitor in the above patent document is located outside the porcelain shell of the vacuum arc-extinguishing chamber, the overall volume of the vacuum arc-extinguishing chamber and the voltage-sharing capacitor after combination is large, which is not favorable for the miniaturization design of the vacuum circuit breaker.

Disclosure of Invention

The invention aims to provide a vacuum arc-extinguishing chamber, which aims to solve the technical problem that the voltage-sharing capacitor is positioned outside a porcelain shell of the vacuum arc-extinguishing chamber in the prior art, so that the overall volume of the vacuum arc-extinguishing chamber and the voltage-sharing capacitor is larger after the vacuum arc-extinguishing chamber and the voltage-sharing capacitor are combined; the invention also aims to provide a vacuum circuit breaker, which aims to solve the technical problems that the voltage-sharing capacitor is positioned outside the porcelain shell of the vacuum arc-extinguishing chamber in the prior art, so that the overall volume of the vacuum arc-extinguishing chamber and the voltage-sharing capacitor after combination is larger, and the miniaturization design of the vacuum circuit breaker is not facilitated.

In order to realize the purpose, the technical scheme of the vacuum arc-extinguishing chamber is as follows:

vacuum interrupter, includes:

the axial two ends of the porcelain shell are respectively provided with a static side cover plate and a dynamic side cover plate;

the static conductive rod is positioned in the porcelain shell and is in conductive connection with the static side cover plate;

the movable conducting rod is positioned in the ceramic shell and is in conductive connection with the movable side cover plate, and a fracture is formed between the movable conducting rod and the static conducting rod;

the static side end part shielding cover is fixed on the inner side of the static side cover plate;

the movable side end shielding cover is fixed on the inner side of the movable side cover plate;

the central main shielding cover is fixed in the porcelain shell and covers the fracture;

the static side voltage-sharing capacitor group is arranged in the porcelain shell and arranged in a plurality of groups around the circumference of the static conducting rod, and the static side voltage-sharing capacitor group is positioned between the central main shielding cover and the static side end part shielding cover;

the movable side voltage-sharing capacitor groups are arranged in the porcelain shell and correspond to the static side voltage-sharing capacitor groups one by one, and the movable side voltage-sharing capacitor groups are arranged around the circumferential direction of the movable conducting rod and are positioned between the central main shielding cover and the movable side end shielding cover;

the static side connecting rod penetrates through the interior of the static side end part shielding cover and is in conductive connection with the static side voltage-sharing capacitor group and the static side cover plate;

the movable side connecting rod penetrates through the inside of the movable side end shielding cover and is in conductive connection with the movable side voltage-sharing capacitor group and the movable side cover plate;

and the middle connecting rod is in conductive connection with the movable side voltage-sharing capacitor group and the static side voltage-sharing capacitor group so as to connect the movable side voltage-sharing capacitor group and the static side voltage-sharing capacitor group in parallel after being connected in series.

The beneficial effects are that: the vacuum arc-extinguishing chamber utilizes the excellent insulating property of the vacuum environment, and the voltage-sharing capacitor group is arranged inside the ceramic shell, so that the voltage sharing of a fracture is realized, and the breakdown probability of the vacuum arc-extinguishing chamber is reduced. And because the static connecting rod connected with the static voltage-sharing capacitor bank passes through the inside of the static end part shielding cover, and the movable connecting rod connected with the movable voltage-sharing capacitor bank passes through the inside of the movable end part shielding cover, the whole structure of the vacuum arc extinguish chamber is compact, and the volume is relatively small.

As a further improvement, the movable side voltage-sharing capacitor group and the static side voltage-sharing capacitor group and the central main shield cover are provided with overlapped parts in the axial direction of the porcelain shell.

The beneficial effects are that: design like this for move side voltage-sharing electric capacity group and quiet side voltage-sharing electric capacity group and further be close to the porcelain shell central line, with the compact degree that further improves vacuum interrupter.

As a further improvement, the intermediate connecting rod is arranged closely to the outer side surface of the central main shielding cover.

The beneficial effects are that: by the design, the movable side voltage-sharing capacitor group and the static side voltage-sharing capacitor group are further close to the center line of the porcelain shell, and the compactness of the vacuum arc extinguish chamber is further improved.

As a further improvement, the porcelain shell comprises two sub-shells, the central main shielding cover is provided with a sealing ring, and the central main shielding cover is fixed in the porcelain shell through the sealing ring; the middle connecting rod is electrically connected with the sealing ring.

The beneficial effects are that: by the design, the voltage-sharing capacitor bank can share the voltage of the gap between the central main shielding cover and the movable side end shielding cover and the gap between the central main shielding cover and the static side end shielding cover, and the breakdown probability of the vacuum arc extinguish chamber is further reduced.

As a further improvement, the static side connecting rod is arranged close to the inner side of the static side end part shielding cover, and the movable side connecting rod is arranged close to the inner side of the movable side end part shielding cover.

The beneficial effects are that: therefore, the static side end part shielding cover and the dynamic side end part shielding cover can be designed to be as small as possible, so that the porcelain shell is close to the central line of the porcelain shell, and the compactness of the vacuum arc extinguish chamber is further improved.

In order to achieve the purpose, the technical scheme of the vacuum circuit breaker is as follows:

vacuum circuit breaker, including casing and the vacuum interrupter of setting in the casing, vacuum interrupter includes:

the axial two ends of the porcelain shell are respectively provided with a static side cover plate and a dynamic side cover plate;

the static conductive rod is positioned in the porcelain shell and is in conductive connection with the static side cover plate;

the movable conducting rod is positioned in the ceramic shell and is in conductive connection with the movable side cover plate, and a fracture is formed between the movable conducting rod and the static conducting rod;

the static side end part shielding cover is fixed on the inner side of the static side cover plate;

the movable side end shielding cover is fixed on the inner side of the movable side cover plate;

the central main shielding cover is fixed in the porcelain shell and covers the fracture;

the static side voltage-sharing capacitor group is arranged in the porcelain shell and arranged in a plurality of groups around the circumference of the static conducting rod, and the static side voltage-sharing capacitor group is positioned between the central main shielding cover and the static side end part shielding cover;

the movable side voltage-sharing capacitor groups are arranged in the porcelain shell and correspond to the static side voltage-sharing capacitor groups one by one, and the movable side voltage-sharing capacitor groups are arranged around the circumferential direction of the movable conducting rod and are positioned between the central main shielding cover and the movable side end shielding cover;

the static side connecting rod penetrates through the interior of the static side end part shielding cover and is in conductive connection with the static side voltage-sharing capacitor group and the static side cover plate;

the movable side connecting rod penetrates through the inside of the movable side end shielding cover and is in conductive connection with the movable side voltage-sharing capacitor group and the movable side cover plate;

and the middle connecting rod is in conductive connection with the movable side voltage-sharing capacitor group and the static side voltage-sharing capacitor group so as to connect the movable side voltage-sharing capacitor group and the static side voltage-sharing capacitor group in parallel after being connected in series.

The beneficial effects are that: the excellent insulating property of vacuum environment puts the voltage-sharing capacitor bank inside the porcelain shell, has realized the voltage-sharing to the fracture, reduces vacuum interrupter's puncture probability. Moreover, the static side connecting rod connected with the static side voltage-sharing capacitor group penetrates through the static side end part shielding cover, and the moving side connecting rod connected with the moving side voltage-sharing capacitor group penetrates through the moving side end part shielding cover, so that the vacuum arc extinguish chamber is compact in overall structure, relatively small in size and beneficial to miniaturization of the vacuum circuit breaker.

As a further improvement, the movable side voltage-sharing capacitor group and the static side voltage-sharing capacitor group and the central main shield cover are provided with overlapped parts in the axial direction of the porcelain shell.

The beneficial effects are that: design like this for move side voltage-sharing electric capacity group and quiet side voltage-sharing electric capacity group and further be close to the porcelain shell central line, with the compact degree that further improves vacuum interrupter.

As a further improvement, the intermediate connecting rod is arranged closely to the outer side surface of the central main shielding cover.

The beneficial effects are that: by the design, the movable side voltage-sharing capacitor group and the static side voltage-sharing capacitor group are further close to the center line of the porcelain shell, and the compactness of the vacuum arc extinguish chamber is further improved.

As a further improvement, the porcelain shell comprises two sub-shells, the central main shielding cover is provided with a sealing ring, and the central main shielding cover is fixed in the porcelain shell through the sealing ring; the middle connecting rod is electrically connected with the sealing ring.

The beneficial effects are that: by the design, the voltage-sharing capacitor bank can share the voltage of the gap between the central main shielding cover and the movable side end shielding cover and the gap between the central main shielding cover and the static side end shielding cover, and the breakdown probability of the vacuum arc extinguish chamber is further reduced.

As a further improvement, the static side connecting rod is arranged close to the inner side of the static side end part shielding cover, and the movable side connecting rod is arranged close to the inner side of the movable side end part shielding cover.

The beneficial effects are that: therefore, the static side end part shielding cover and the dynamic side end part shielding cover can be designed to be as small as possible, so that the porcelain shell is close to the central line of the porcelain shell, and the compactness of the vacuum arc extinguish chamber is further improved.

Drawings

FIG. 1 is a schematic structural diagram of a vacuum interrupter according to the present invention;

in the figure: 11. a porcelain shell; 12. a central main shield; 13. a movable conductive rod; 14. a static conductive rod; 15. a movable side cover plate; 16. a stationary side cover plate; 17. a stationary-side end shield; 18. a stationary side connecting rod; 19. a static side voltage-sharing capacitor group; 20. a middle connecting rod; 21. a sealing ring; 22. a movable side voltage-sharing capacitor group; 23. a movable side connecting rod; 24. a movable side end shield; 25. and (5) breaking.

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, may be 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, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. Furthermore, the terms "front", "back", "upper", "lower", "left" and "right" are based on the orientations and positional relationships shown in the drawings and are only for convenience in describing the present invention, but do not indicate that the referred device or component must have a specific orientation, and thus, should not be construed as limiting the present invention.

The features and properties of the present invention are described in further detail below with reference to examples.

Example 1 of the vacuum interrupter of the invention:

as shown in fig. 1, the vacuum arc-extinguishing chamber includes a porcelain shell 11, a moving-side cover plate 15 and a static-side cover plate 16 are respectively disposed at two axial ends of the porcelain shell 11, and both the moving-side cover plate 15 and the static-side cover plate 16 are conductive cover plates; a movable conducting rod 13 and a static conducting rod 14 are arranged in the porcelain shell 11, the movable conducting rod 13 is in conductive connection with a movable side cover plate 15, and the static conducting rod 14 is in conductive connection with a static side cover plate 16. Wherein a break 25 is formed between the movable conductor bar 13 and the stationary conductor bar 14.

In this embodiment, the porcelain shell 11 is further provided with a movable side end shield 24, a central main shield 12 and a stationary side end shield 17, the movable side end shield 24 is fixedly connected to the inner side of the movable side cover 15, the stationary side end shield 17 is fixedly connected to the inner side of the stationary side cover 16, and the central main shield 12 is fixedly connected to the porcelain shell 11 and covers the fracture 25.

In this embodiment, the porcelain shell 11 includes two sub-shells, the two sub-shells are arranged along the axial direction of the porcelain shell 11, the central main shield 12 has a sealing ring 21, and the central main shield 12 is fixedly connected in the porcelain shell 11 through the sealing ring 21.

As shown in fig. 1, a static side voltage-sharing capacitor group 19 and a dynamic side voltage-sharing capacitor group 22 are arranged in a porcelain shell 11 to realize voltage sharing for a fracture 25 of a vacuum arc-extinguishing chamber; the static side voltage-sharing capacitor groups 19 are arranged in the porcelain shell 11 and are uniformly distributed at intervals around the circumference of the static conducting rod 14, and all the static side voltage-sharing capacitor groups 19 are positioned between the central main shielding cover 12 and the static side end part shielding cover 17; the movable side voltage-sharing capacitor groups 22 are arranged in the porcelain shell 11 and surround the circumference of the movable conducting rod 13, and are evenly arranged at intervals, and all the movable side voltage-sharing capacitor groups 22 are positioned between the central main shield 12 and the movable side end shield 24. The static side voltage-sharing capacitor group 19 corresponds to the dynamic side voltage-sharing capacitor group 22 one by one, the number of the static side voltage-sharing capacitors included in each static side voltage-sharing capacitor group 19 can be one or more than two, and the number of the dynamic side voltage-sharing capacitors included in each dynamic side voltage-sharing capacitor group 22 can be one or more than two.

In this embodiment, a stationary-side connecting rod 18, a moving-side connecting rod 23 and a middle connecting rod 20 are further arranged in the porcelain shell 11, and the stationary-side connecting rod 18, the moving-side connecting rod 23 and the middle connecting rod 20 are all conducting rods; one end of the static side connecting rod 18 is connected to the static side voltage-sharing capacitor bank 19 in a threaded mode, the other end of the static side connecting rod 18 is welded to the static side cover plate 16, and the static side voltage-sharing capacitor bank 19 and the static side cover plate 16 are connected in a conductive mode; one end of the movable side connecting rod 23 is connected to the movable side voltage-sharing capacitor bank 22 in a threaded manner, and the other end of the movable side connecting rod 23 is welded to the movable side cover plate 15 so as to be electrically connected with the movable side voltage-sharing capacitor bank 22 and the movable side cover plate 15; one end of the middle connecting rod 20 is in threaded connection with the movable side voltage-sharing capacitor group 22, and the other end of the middle connecting rod 20 is in threaded connection with the static side voltage-sharing capacitor group 19 so as to be in conductive connection with the movable side voltage-sharing capacitor group 22 and the static side voltage-sharing capacitor group 19. The design is that the movable side voltage-sharing capacitor group 22 and the static side voltage-sharing capacitor group 19 are connected in series and then are connected with the movable conducting rod and the static conducting rod in parallel.

In the present embodiment, the intermediate connection rod 20 is conductively connected to the seal ring 21, so that the potentials of the moving-side end shield 24, the central main shield 12, and the stationary-side end shield 17 are the same, and voltage equalization is achieved for the gap between the central main shield 12 and the moving-side end shield 24 and the gap between the central main shield 12 and the stationary-side end shield 17.

In this embodiment, the conductive connection between the intermediate connecting rod 20 and the sealing ring 21 is as follows: the sealing ring 21 is provided with a through hole, and the middle connecting rod 20 is welded on the sealing ring 21 after passing through the through hole on the sealing ring 21. In other embodiments, the intermediate connecting rod is conductively connected to the seal ring in the following manner: the middle connecting rod comprises two sub-rod bodies, wherein one sub-rod body is connected with the static side voltage-sharing capacitor group and the sealing ring, the other sub-rod body is connected with the dynamic side voltage-sharing capacitor group and the sealing ring, and the two sub-rod bodies are connected with the sealing ring in a welding mode.

As shown in fig. 1, the stationary-side connecting rod 18 is inserted from the inside of the stationary-side end shield 17 and is disposed in close contact with the inside of the stationary-side end shield 17, and the movable-side connecting rod 23 is inserted from the inside of the movable-side end shield 24 and is disposed in close contact with the inside of the movable-side end shield 24; moreover, the movable side voltage-sharing capacitor group 22, the fixed side voltage-sharing capacitor group 19 and the central main shielding case 12 are provided with overlapped parts in the axial direction of the porcelain shell 11, so that after the movable side voltage-sharing capacitor group and the fixed side voltage-sharing capacitor group are placed into the porcelain shell 11, the whole structure of the vacuum arc-extinguishing chamber is compact, the volume is relatively small, and the miniaturization of the vacuum circuit breaker is facilitated.

In this embodiment, the intermediate connecting rod 20 is closely attached to the outer side surface of the central main shielding case 12, so as to further improve the compactness of the vacuum interrupter.

The vacuum arc-extinguishing chamber utilizes the excellent insulating property of the vacuum environment, the voltage-sharing capacitor group is arranged in the ceramic shell, the voltage sharing can be carried out on a fracture, the voltage sharing can be carried out on the gap between the central main shielding cover and the movable side end shielding cover and the gap between the central main shielding cover and the static side end shielding cover, and the breakdown probability of the vacuum arc-extinguishing chamber is reduced. In addition, because the static side connecting rod of connecting static side voltage-sharing capacitor group passes by the inside of static side end shield cover, the moving side connecting rod of connecting moving side voltage-sharing capacitor group passes by the inside of moving side end shield cover for vacuum interrupter's overall structure is comparatively compact, and the volume is less relatively, is favorable to vacuum circuit breaker's miniaturization.

Example 2 of the vacuum interrupter of the invention:

the present embodiment is different from embodiment 1 in that in embodiment 1, the intermediate connection rod 20 is disposed closely to the outer side surface of the central main shield 12. In this embodiment, a gap is formed between the middle connecting rod and the outer side surface of the central main shielding case.

Example 3 of the vacuum interrupter of the invention:

the difference between this embodiment and embodiment 1 is that in embodiment 1, the porcelain shell 11 includes two sub-shells, the central main shield 12 has a sealing ring 21, the central main shield 12 is fixed in the porcelain shell 11 through the sealing ring 21, and the intermediate connecting rod 20 is electrically connected to the sealing ring 21. In this embodiment, under the condition that includes two sub-casings based on the porcelain shell, central authorities ' main shield cover has fixed ear, and fixed ear has a plurality ofly along the circumference interval arrangement of porcelain shell, and central authorities ' main shield cover passes through fixed ear to be fixed in the porcelain shell, and the intermediate junction pole is passed by the space between two fixed ears to quiet side voltage-sharing capacitance group of conductive connection and move side voltage-sharing capacitance group, it is gapped between the lateral surface of intermediate junction pole and central authorities ' main shield cover.

Example 4 of the vacuum interrupter of the invention:

the present embodiment is different from embodiment 1 in that in embodiment 1, the stationary-side connecting rod 18 is inserted into the stationary-side end shield 17 and is disposed in close contact with the inside of the stationary-side end shield 17, and the movable-side connecting rod 23 is inserted into the movable-side end shield 24 and is disposed in close contact with the inside of the movable-side end shield 24. In this embodiment, the stationary-side connecting rod passes through the inside of the stationary-side end shield and has a gap with the inside of the stationary-side end shield, and the moving-side connecting rod passes through the inside of the moving-side end shield and has a gap with the inside of the moving-side end shield.

In an embodiment of the vacuum circuit breaker of the present invention, the vacuum circuit breaker in this embodiment includes a housing and a vacuum interrupter disposed in the housing, and the vacuum interrupter has the same structure as that described in any one of embodiments 1 to 4 of the vacuum interrupter, and is not described herein again.

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.