CN220456304U - Fixed vacuum circuit breaker - Google Patents

Abstract

The utility model provides a fixed vacuum circuit breaker, which belongs to the technical field of circuit breakers and comprises a box body, a solid-sealed polar pole, a breaking mechanism and a linkage mechanism, wherein the solid-sealed polar pole comprises a first insulating shell and a second insulating shell which are vertically arranged, vacuum arc-extinguishing chambers are arranged in the first insulating shell and the second insulating shell, a movable end contact and a fixed end contact are arranged in the vacuum arc-extinguishing chambers, the movable end contact is connected with a movable end conducting rod, and the two movable end conducting rods are in soft conductive connection; the utility model is provided with the double arc-extinguishing chambers to form double break points, improves the breaking capacity of the circuit breaker, reduces the probability of being broken down by high voltage, and improves the running safety and reliability of a power system.

Description

Fixed vacuum circuit breaker

Technical Field

The utility model relates to the technical field of circuit breakers, in particular to a fixed vacuum circuit breaker.

Background

The power system is a large real-time working system, the working mode of the power system is characterized in that the power generation, the transformation, the power transmission and the power utilization are completed at the same instant. As the coverage area of the power grid system is wider and wider, the capacity of the power unit is larger and larger, and the requirement for power supply is higher and higher, particularly important is that the security is emphasized in the power industry, and the power system is required to be coordinated by a very complete automatic control mode.

The advanced control system is finally enabled to realize control, and the circuit breaker with the newer type is an important measure. Switching elements such as an indoor high-voltage vacuum circuit breaker, an indoor high-voltage isolating switch, an indoor high-voltage grounding switch and the like which are commonly used at present are important electrical elements in alternating-current metal closed switch equipment (namely a high-voltage switch cabinet).

The solid-sealed pole is a device formed by simultaneously embedding the vacuum arc-extinguishing chamber and the related conductive parts of the circuit breaker into a solid-sealed shell which is easy to cure, such as epoxy resin. In general, the conductive parts in the solid sealed shell of the solid sealed pole are provided with a static end wire outlet terminal, a vacuum arc extinguishing chamber and a movable end wire outlet terminal, wherein the upper end of the vacuum arc extinguishing chamber is electrically connected with the static end wire outlet terminal, and the lower end of the vacuum arc extinguishing chamber is electrically connected with the movable end wire outlet terminal. A static end contact and a movable end contact are arranged in the vacuum arc-extinguishing chamber along the up-down direction, the static end contact is in conductive connection with a static end outlet terminal through a static end conducting rod, and the movable end contact is in conductive connection with a movable end outlet terminal through a movable end conducting rod. The movable end conducting rod is in transmission connection with the operating mechanism, and the operating mechanism drives the movable end conducting rod to move up and down to realize the contact and separation of the movable end contact and the fixed end contact, so that the opening and closing of the circuit breaker are realized.

In the prior art, as disclosed in the patent CN110676112B, a solid-sealed pole and a circuit breaker are disclosed, which comprise a solid-sealed shell, wherein a static end outgoing terminal, a vacuum arc-extinguishing chamber and a movable end outgoing terminal are arranged in the solid-sealed shell, and only one vacuum arc-extinguishing chamber is arranged in the solid-sealed pole, so that the probability of breakdown exists under the condition of high voltage, and the operation safety and reliability of a power system are insufficient.

Disclosure of Invention

The utility model aims to overcome the defects and shortcomings of the prior art and provides a fixed vacuum circuit breaker.

The technical scheme adopted by the utility model is as follows: the fixed vacuum circuit breaker comprises a box body and a solid-sealed polar pole arranged on the box body, wherein the solid-sealed polar pole comprises a first insulating shell and a second insulating shell, the first insulating shell and the second insulating shell are communicated with each other through an inner cavity, the first insulating shell is transversely arranged on the box body, and the second insulating shell is vertically arranged relative to the first insulating shell;

a first vacuum arc-extinguishing chamber is arranged in the first insulating shell, a first moving end contact and a first fixed end contact are arranged in the first vacuum arc-extinguishing chamber, and the first moving end contact is connected with a first moving end conducting rod;

a second vacuum arc-extinguishing chamber is arranged in the second insulating shell, a second moving end contact and a second fixed end contact are arranged in the second vacuum arc-extinguishing chamber, and the second moving end contact is connected with a second moving end conducting rod;

the first insulating shell is provided with a first wiring terminal connected with a first fixed end contact, the second insulating shell is provided with a second wiring terminal connected with a second fixed end contact, the first movable end conducting rod is connected with a first insulating pull rod, the second movable end conducting rod is connected with a second insulating pull rod, and the first movable end conducting rod and the second movable end conducting rod are in soft conductive connection;

the circuit breaker is characterized by further comprising a breaking mechanism and a linkage mechanism, wherein the breaking mechanism is matched with the linkage mechanism and used for enabling the circuit breaker to have a first working state in which only the first moving end contact acts and a second working state in which the first moving end contact and the second moving end contact act simultaneously.

The breaking mechanism comprises:

the upper plate part is arranged in the inner cavity and is provided with a through hole for the first insulating pull rod to pass through;

a lower plate portion provided at a lower portion of the first insulation tie rod;

the elastic piece is sleeved on the first insulating pull rod, the upper end and the lower end of the elastic piece are respectively abutted against the upper plate part and the lower plate part, and the elastic piece is used for enabling the first movable end contact and the first fixed end contact to be kept in a separated state or to be restored to the separated state;

the abutting end is arc-shaped and is arranged at one end of the first insulation pull rod, which is far away from the first movable end conducting rod, and extends into the box body;

the movable push rod is arranged in the box body in a sliding manner along the direction of the second movable end conducting rod, and the abutting end abuts against the movable push rod;

the driving mechanism is arranged in the box body and used for driving the movable push rod to move so that the first movable end contact has a closing position, a first breaking position and a second breaking position relative to the first fixed end contact;

the distance between the first movable end contact and the first fixed end contact when the first movable end contact is in the first breaking position is smaller than the distance between the first movable end contact and the first fixed end contact when the first movable end contact is in the second breaking position.

The movable push rod is provided with a first abutting part, a second abutting part and a third abutting part towards the first insulating pull rod, the height of the second abutting part is larger than that of the first abutting part, and the height of the first abutting part is larger than that of the third abutting part;

when the abutting end abuts against the first abutting part, the first movable end contact is located at a first breaking position;

when the abutting end abuts against the second abutting part, the first movable end contact is located at the closing position;

when the abutting end abuts against the third abutting part, the first movable end contact is located at the second breaking position.

A first guide part in smooth transition is arranged between the first abutting part and the second abutting part, and a second guide part in smooth transition is arranged between the second abutting part and the third abutting part.

The first abutting part, the second abutting part and the third abutting part are arranged as continuous guide grooves, and the abutting ends are positioned in the guide grooves to slide.

The through hole is internally connected with a sleeve in a threaded manner, the first insulating pull rod penetrates through the sleeve, and the upper end and the lower end of the elastic piece are respectively abutted against the sleeve and the lower plate portion.

The movable push rod is characterized by further comprising a control system, one end, far away from the solid-sealed polar pole, of the movable push rod is provided with a rack part, the driving mechanism comprises a first gear and a driving source for the rotation of the first gear, the driving source is connected with the control system, and the first gear is meshed with the rack part.

The linkage mechanism comprises:

the rack is arranged on the first insulating pull rod along the moving direction of the first insulating pull rod;

the rotating shaft is rotatably arranged in the inner cavity along the direction of the second movable end conducting rod;

the second gear is arranged on the rotating shaft and meshed with the rack, and synchronously rotates with the rotating shaft;

the first bevel gear is arranged at one end of the rotating shaft, which is close to the second arc extinction, and synchronously rotates with the rotating shaft;

the fixed shaft is arranged in the inner cavity along the direction of the first movable end conducting rod;

the second bevel gear is rotationally provided with a fixed shaft and meshed with the first bevel gear, a cylinder body extends towards the second movable end conducting rod, and a linkage part is arranged at the lower end of the cylinder body;

the sliding disc is arranged in the inner cavity in a sliding manner along the direction of the second movable end conducting rod, one end of the sliding disc is connected with the second insulating pull rod, and a linkage hole is formed in the sliding disc;

the linkage part is positioned in the linkage hole and rotates to have a first state of separating the second moving end contact from the second fixed end contact and a second state of closing the second moving end contact and the second fixed end contact.

When the first movable end contact is positioned at the closing position, the sliding disc does not move, and the second movable end contact and the second fixed end contact are closed;

when the first movable end contact is positioned at a first breaking position, the sliding disc does not move, and the second movable end contact and the second fixed end contact are closed;

when the first movable end contact is located at a second disconnection position, the sliding disc moves, and the second movable end contact is disconnected with the second fixed end contact.

When the first movable end contact is switched between a closing position and a first breaking position, the sliding disc does not move, and the second movable end contact and the second fixed end contact are closed in the whole process;

when the first movable end contact is switched between the closing position and the second breaking position, the sliding disc moves, and the second movable end contact is broken from the second fixed end contact.

The beneficial effects of the utility model are as follows: the utility model is provided with the double arc-extinguishing chambers to form double break points, improves the breaking capacity of the circuit breaker, reduces the probability of being broken down by high voltage, and improves the running safety and reliability of a power system.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that it is within the scope of the utility model to one skilled in the art to obtain other drawings from these drawings without inventive faculty.

FIG. 1 is a schematic illustration of the present utility model;

FIG. 2 is a schematic view of the first movable contact in the closed position according to the present utility model;

FIG. 3 is a schematic view of a first moving end contact of the present utility model in a first breaking position;

FIG. 4 is a schematic view of the first moving end contact of the present utility model in a second disconnected position;

FIG. 5 is a partial schematic view of a breaking mechanism and linkage mechanism of the present utility model;

FIG. 6 is a schematic view of a portion of a movable push rod and a first insulating pull rod according to the present utility model.

Detailed Description

The utility model will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the utility model and therefore show only the structures which are relevant to the utility model.

In the description of the present application, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships that are based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

In the description of the present application, it should be noted that, in the embodiments of the present utility model, all the expressions "first" and "second" are used to distinguish two entities with the same name and different parameters, and it is noted that the "first" and "second" are merely used for convenience of expression, and should not be construed as limiting the embodiments of the present utility model, and the following embodiments are not described in detail herein.

As shown in fig. 1 to 6, an embodiment of the present utility model is provided:

the fixed vacuum circuit breaker comprises a box body 1 and a solid sealed polar pole 2 arranged on the box body 1, wherein the solid sealed polar pole 2 comprises a first insulating shell 21 and a second insulating shell 22, the first insulating shell 21 is transversely arranged on the box body 1, and the second insulating shell 22 is vertically arranged relative to the first insulating shell 21; a first vacuum arc-extinguishing chamber is arranged in the first insulating housing 21, a first moving end contact 211 and a first fixed end contact 212 are arranged in the first vacuum arc-extinguishing chamber, and the first moving end contact 211 is connected with a first moving end conducting rod 213; the second vacuum arc-extinguishing chamber is arranged in the second insulating shell 22, the second vacuum arc-extinguishing chamber is internally provided with a second moving end contact 221 and a second static end contact 222, the second moving end contact 221 is connected with a second moving end conducting rod 223, double breaking points are formed by being provided with double arc-extinguishing chambers, breaking capacity of the circuit breaker is improved, and probability of being broken down by high voltage is reduced.

The first insulating housing 21 is provided with a first wiring terminal 3 connected with the first fixed end contact 212, the second insulating housing 22 is provided with a second wiring terminal 4 connected with the second fixed end contact 222, the first movable end conducting rod 213 is connected with a first insulating pull rod 5, the second movable end conducting rod 223 is connected with a second insulating pull rod 6, and a soft conductive connection 7 is formed between the first movable end conducting rod 213 and the second movable end conducting rod 223; the first connecting terminal 3 and the second connecting terminal 4 are used for connecting an incoming line and an outgoing line, and the specific structure of the vacuum arc extinguishing chamber can refer to the structure of the solid-sealed polar pole in the prior art, and the solid-sealed polar pole with strong breaking capacity is preferred.

Further, the circuit breaker further comprises a breaking mechanism 8 and a linkage mechanism 9, wherein the breaking mechanism 8 is matched with the linkage mechanism 9 to enable the circuit breaker to have a first working state in which only the first moving end contact 211 acts and a second working state in which the first moving end contact 211 and the second moving end contact 221 act simultaneously; specifically, only the first vacuum arc-extinguishing chamber is disconnected in the first working state, and in the second working state, the first vacuum arc-extinguishing chamber and the second vacuum arc-extinguishing chamber can be disconnected simultaneously, the breaking capacity is improved, and the application range of the circuit breaker is enlarged, wherein the second vacuum arc-extinguishing chamber can not act when the first vacuum arc-extinguishing chamber is disconnected sufficiently, and the second vacuum arc-extinguishing chamber is equivalent to being used as a conductive piece only, and the service life of the second vacuum arc-extinguishing chamber can be prolonged.

Specifically, the breaking mechanism 8 includes:

an upper plate portion 81 provided in the inner cavity, on which a through hole 811 through which the first insulation rod 5 passes is provided; the upper plate portion 81 may be formed by extending the first insulating housing 21; a lower plate portion 82 provided at a lower portion of the first insulation rod 5; an elastic member 83 sleeved on the first insulating pull rod 5, wherein the upper and lower ends of the elastic member are respectively abutted against the upper plate portion 81 and the lower plate portion 82, and the elastic member 83 is used for keeping the first moving end contact 211 and the first fixed end contact 212 in a separated state or recovering the separated state; the elastic piece 83 adopts a columnar spring, and is abutted against the end 84, is arc-shaped and is arranged at one end of the first insulation pull rod 5, which is far away from the first movable end conducting rod 213, and extends into the box body 1; a movable push rod 85 slidably disposed in the case 1 along the second movable end conductive rod 223, the abutting end 84 abutting against the movable push rod 85; the elastic piece 83 can enable the abutting end 84 to better abut against the movable push rod 85, so that the stability of the mechanism is maintained; the driving mechanism is arranged in the box body 1 and is used for driving the movable push rod 85 to move so that the first movable end contact 211 has a closing position, a first breaking position and a second breaking position relative to the first fixed end contact 212; the distance between the first moving end contact 211 and the first fixed end contact 212 when the first moving end contact 211 is at the first breaking position is smaller than the distance between the first moving end contact 211 and the first fixed end contact 212 when the first moving end contact 211 is at the second breaking position; the first vacuum arc-extinguishing chamber also has double-gear breaking capacity through the mechanism, for lower voltage breaking, the first vacuum arc-extinguishing chamber is only required to be switched between the closing position and the first breaking position, and when the breaking performance cannot be met in the first breaking position, the first vacuum arc-extinguishing chamber can be switched between the closing position and the second breaking position, and the breaking capacity is improved by increasing the breaking distance.

Further, the movable push rod 85 is provided with a first abutting portion 851, a second abutting portion 852 and a third abutting portion 853 towards the first insulating pull rod 5, the height of the second abutting portion 852 is larger than that of the first abutting portion 851, and the height of the first abutting portion 851 is larger than that of the third abutting portion 853; when the abutting end 84 abuts against the first abutting portion 851, the first moving end contact 211 is located at the first breaking position; when the abutting end 84 abuts against the second abutting portion 852, the first moving end contact 211 is located at the closed position; when the abutting end 84 abuts against the third abutting portion 853, the first moving end contact 211 is located at the second breaking position, wherein a first guiding portion 854 with smooth transition is provided between the first abutting portion 851 and the second abutting portion 852, and a second guiding portion 855 with smooth transition is provided between the second abutting portion 852 and the third abutting portion 853, so that the moving push rod 85 can move smoothly relative to the abutting end 84, and the smoothness of the operation of the mechanism is improved.

Further, the first abutting portion 851, the second abutting portion 852 and the third abutting portion 853 are provided as continuous guide grooves 86, and the abutting end 84 is located in the guide grooves 86 and slides in the guide grooves 86, so that stability of the mechanism can be improved, and offset and dislocation of the abutting end 84 and the movable push rod 85 during operation can be avoided, so that breaking failure is caused.

The linkage mechanism 9 comprises:

a rack 91 provided to the first insulating rod 5 in the moving direction of the first insulating rod 5; a rotation shaft 92 rotatably disposed in the inner cavity along the second movable end conductive rod 223; a second gear 93 provided on the rotation shaft 92 and engaged with the rack 91, and rotated in synchronization with the rotation shaft 92; a first bevel gear 94 disposed on the shaft 92 near the second arc extinguishing end and rotating synchronously with the shaft 92; a fixed shaft 95 disposed in the inner cavity along the first movable-end conductive rod 213; a second bevel gear 96 rotatably provided with a fixed shaft 95 and engaged with the first bevel gear 94, the second bevel gear 96 extending toward the second movable end conductive rod 223 to form a cylinder 961, and a linkage 97 being provided at a lower end of the cylinder 961; a sliding disc 98 slidably disposed in the inner cavity along the direction of the second movable end conductive rod 223, and one end of the sliding disc 98 is connected with the second insulating pull rod 6, and a linkage hole 99 is disposed on the sliding disc 98; a slide groove adapted to the slide plate 98 is provided in the inner cavities of the first insulating housing 21 and the second insulating housing 22. The linkage 97 is located in the linkage hole 99 and rotates to have a first state in which the second movable end contact 221 is separated from the second fixed end contact 222 and a second state in which the second movable end contact 221 is closed with the second fixed end contact 222. Specifically, when the abutting end 84 is located on and between the first abutting portion 851 and the second abutting portion 852, the linkage portion 97 rotates by a certain angle, and the linkage portion 97 does not collide with the inner wall of the linkage hole 99, so that the sliding disc 98 does not move, and when the abutting end 84 is located between the second abutting portion 852 and the third abutting portion 853, the linkage portion 97 rotates by a larger angle, and at this time, the linkage portion 97 collides with the inner wall of the linkage hole 99, and the sliding disc 98 moves to pull the second movable end contact 221 to be separated from the second fixed end contact 222. Further, a spring is also arranged on the second insulating pull rod 6, so that the second movable end contact 221 and the second fixed end contact 222 are kept closed in a normal state.

Further, the through hole 811 is internally threaded with the sleeve 87, the first insulating rod 5 passes through the sleeve 87, the upper and lower ends of the elastic member 83 are respectively abutted against the sleeve 87 and the lower plate 82, the elastic force of the elastic member 83 can be adjusted by rotating the sleeve 87, and the rack 91 is meshed with the second gear 93 to have a certain resistance to the up-and-down movement of the first insulating rod 5, so that the breaking of the first movable end contact 211 is affected, the elastic member 83 needs a proper elastic force to ensure the breaking of the first movable end contact 211, and if the elastic force of the elastic member 83 is too large, the lateral movement of the movable push rod 85 is affected, so that the adjustment by the sleeve 87 is needed.

When the abutting end 84 is located at the second abutting portion 852, the first moving end contact 211 is located at the closed position, the sliding disc 98 does not move, and the second moving end contact 221 and the second fixed end contact 222 are closed; when the abutting end 84 is located at the first abutting portion 851, the first moving end contact 211 is located at the first breaking position, the sliding disc 98 does not move, and the second moving end contact 221 and the second fixed end contact 222 are closed; when the abutting end 84 is located at the third abutting portion 853, the first moving end contact 211 is located at the second breaking position, the sliding plate 98 moves, and the second moving end contact 221 breaks away from the second stationary end contact 222. When the first moving end contact 211 is switched between the closed position and the first breaking position, the sliding disc 98 does not move, and the second moving end contact 221 and the second fixed end contact 222 are closed in the whole course; the sliding disc 98 moves when the first moving-end contact 211 is switched between the closed position and the second breaking position, and the second moving-end contact 221 is broken from the second stationary-end contact 222.

The device further comprises a control system and a voltage sensor connected with the control system, wherein a rack part 88 is arranged at one end, far away from the solid-sealed pole 2, of the movable push rod 85, the driving mechanism comprises a first gear 89 and a driving source for the rotation of the first gear 89, the driving source can be a motor, the driving source is connected with the control system, and the first gear 89 is meshed with the rack part 88. The voltage sensors can be respectively arranged at the wire inlet and outlet ends, and the driving source is controlled according to the voltage, so that the first working state and the second working state are correctly switched.

The foregoing disclosure is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims.

Claims (10)

1. The fixed vacuum circuit breaker comprises a box body (1) and a solid sealed polar pole (2) arranged on the box body (1), and is characterized in that the solid sealed polar pole (2) comprises a first insulating shell (21) and a second insulating shell (22) which are communicated with each other through an inner cavity, the first insulating shell (21) is transversely arranged on the box body (1), and the second insulating shell (22) is vertically arranged relative to the first insulating shell (21);

a first vacuum arc-extinguishing chamber is arranged in the first insulating shell (21), a first movable end contact (211) and a first static end contact (212) are arranged in the first vacuum arc-extinguishing chamber, and the first movable end contact (211) is connected with a first movable end conducting rod (213);

a second vacuum arc-extinguishing chamber is arranged in the second insulating shell (22), a second movable end contact (221) and a second fixed end contact (222) are arranged in the second vacuum arc-extinguishing chamber, and the second movable end contact (221) is connected with a second movable end conducting rod (223);

the first insulating shell (21) is provided with a first wiring terminal (3) connected with a first fixed end contact (212), the second insulating shell (22) is provided with a second wiring terminal (4) connected with a second fixed end contact (222), the first movable end conducting rod (213) is connected with a first insulating pull rod (5), the second movable end conducting rod (223) is connected with a second insulating pull rod (6), and the first movable end conducting rod (213) and the second movable end conducting rod (223) are in soft conductive connection (7);

the circuit breaker is characterized by further comprising a breaking mechanism (8) and a linkage mechanism (9), wherein the breaking mechanism (8) is matched with the linkage mechanism (9) to enable the circuit breaker to have a first working state in which only the first moving end contact (211) acts and a second working state in which the first moving end contact (211) and the second moving end contact (221) act simultaneously.

2. A stationary vacuum interrupter according to claim 1, wherein the breaking mechanism (8) comprises:

an upper plate portion (81) provided in the inner cavity, on which a through hole (811) through which the first insulating rod (5) passes is provided;

a lower plate portion (82) provided at the lower portion of the first insulating rod (5);

the elastic piece (83) is sleeved on the first insulating pull rod (5), the upper end and the lower end are respectively abutted against the upper plate part (81) and the lower plate part (82), and the elastic piece (83) is used for enabling the first movable end contact (211) and the first fixed end contact (212) to be kept in a separated state or to be restored to the separated state;

the abutting end (84) is arc-shaped and is arranged at one end of the first insulation pull rod (5) far away from the first movable end conducting rod (213), and extends into the box body (1);

a movable push rod (85) which is slidably arranged in the box body (1) along the direction of the second movable end conducting rod (223), wherein the abutting end (84) abuts against the movable push rod (85);

the driving mechanism is arranged in the box body (1) and is used for driving the movable push rod (85) to move so that the first movable end contact (211) has a closing position, a first breaking position and a second breaking position relative to the first fixed end contact (212);

the distance between the first movable end contact (211) and the first fixed end contact (212) when the first movable end contact (211) is positioned at the first breaking position is smaller than the distance between the first movable end contact (211) and the first fixed end contact (212) when the first movable end contact is positioned at the second breaking position.

3. The stationary vacuum circuit breaker according to claim 2, characterized in that the moving push rod (85) is provided with a first abutment (851), a second abutment (852) and a third abutment (853) towards the first insulating pull rod (5), the second abutment (852) being higher than the first abutment (851), the first abutment (851) being higher than the third abutment (853);

when the abutting end (84) abuts against the first abutting part (851), the first movable end contact (211) is positioned at a first breaking position;

when the abutting end (84) abuts against the second abutting part (852), the first movable end contact (211) is located at a closed position;

when the abutting end (84) abuts against the third abutting portion (853), the first movable end contact (211) is located at a second breaking position.

4. A stationary vacuum interrupter according to claim 3, characterized in that a first guiding part (854) is provided in a rounded transition between the first abutment part (851) and the second abutment part (852), and a second guiding part (855) is provided in a rounded transition between the second abutment part (852) and the third abutment part (853).

5. The stationary vacuum interrupter according to claim 4, wherein the first (851), second (852) and third (853) abutments are provided as a continuous guide slot (86), the abutment end (84) being slidingly located within the guide slot (86).

6. The fixed vacuum circuit breaker according to claim 2, wherein the through hole (811) is internally screwed with a sleeve (87), the first insulating rod (5) passes through the sleeve (87), and the upper and lower ends of the elastic member (83) are respectively abutted against the sleeve (87) and the lower plate portion (82).

7. The fixed vacuum circuit breaker according to claim 2, further comprising a control system, wherein a rack portion (88) is provided at an end of the movable push rod (85) away from the solid-sealed pole (2), the driving mechanism comprises a first gear (89) and a driving source for rotation of the first gear (89), the driving source is connected with the control system, and the first gear (89) is meshed with the rack portion (88).

8. A stationary vacuum interrupter according to claim 2, wherein the linkage (9) comprises:

a rack (91) provided to the first insulating rod (5) in the direction in which the first insulating rod (5) moves;

a rotating shaft (92) which is rotatably arranged in the inner cavity along the direction of the second movable end conducting rod (223);

a second gear (93) which is provided on the rotation shaft (92) and which is engaged with the rack (91) and which rotates in synchronization with the rotation shaft (92);

the first bevel gear (94) is arranged at the rotating shaft (92) and close to the second arc extinguishing end, and rotates synchronously with the rotating shaft (92);

a fixed shaft (95) which is arranged in the inner cavity along the direction of the first movable end conducting rod (213);

a second bevel gear (96) which is rotatably provided with a fixed shaft (95) and is meshed with the first bevel gear (94), wherein a cylinder (961) extends towards the second movable end conducting rod (223) from the second bevel gear (96), and a linkage part (97) is arranged at the lower end of the cylinder (961);

the sliding disc (98) is arranged in the inner cavity in a sliding manner along the direction of the second movable end conducting rod (223), one end of the sliding disc is connected with the second insulating pull rod (6), and a linkage hole (99) is formed in the sliding disc (98);

the linkage part (97) is positioned in the linkage hole (99) and rotates to have a first state of separating the second movable end contact (221) from the second fixed end contact (222) and a second state of closing the second movable end contact (221) and the second fixed end contact (222).

9. The stationary vacuum interrupter of claim 8, wherein the sliding disk (98) is not moved when the first moving end contact (211) is in the closed position, and the second moving end contact (221) is closed with a second stationary end contact (222);

when the first movable end contact (211) is positioned at a first breaking position, the sliding disc (98) does not move, and the second movable end contact (221) and the second fixed end contact (222) are closed;

when the first movable end contact (211) is located at a second disconnection position, the sliding disc (98) moves, and the second movable end contact (221) is disconnected from the second fixed end contact (222).

10. The stationary vacuum interrupter according to claim 8, wherein the sliding disc (98) does not move when the first moving end contact (211) is switched between the closed position and the first breaking position, the second moving end contact (221) being fully closed with the second stationary end contact (222);

when the first movable end contact (211) is switched between a closing position and a second breaking position, the sliding disc (98) moves, and the second movable end contact (221) is broken from the second fixed end contact (222).