CN219534388U

CN219534388U - Vacuum circuit breaker

Info

Publication number: CN219534388U
Application number: CN202320455768.2U
Authority: CN
Inventors: 苏载亮; 苏广; 谭海涛; 罗冬冬; 罗光碧
Original assignee: Zhejiang Yunkong Power Equipment Co ltd
Current assignee: Zhejiang Yunkong Power Equipment Co ltd
Priority date: 2023-03-06
Filing date: 2023-03-06
Publication date: 2023-08-15
Anticipated expiration: 2033-03-06

Abstract

The utility model provides a vacuum circuit breaker, which belongs to the technical field of circuit breakers and comprises a circuit breaker mechanism, wherein the circuit breaker mechanism comprises a circuit breaker transmission shaft, a vacuum arc-extinguishing chamber and a circuit breaker transmission assembly, the vacuum arc-extinguishing chamber comprises a movable end conducting rod, the circuit breaker transmission assembly comprises an insulating transmission part and an eccentric wheel arranged on the circuit breaker transmission shaft, the insulating transmission part comprises a pull rod part connected with the movable end conducting rod and a frame body part linked with the eccentric wheel, the eccentric wheel comprises a first abutting end and a second abutting end which can abut against the upper end of the frame body part, and the distance between the first abutting end and the axis of the circuit breaker transmission shaft is larger than the distance between the second abutting end and the axis of the circuit breaker transmission shaft; according to the utility model, the switching-on and switching-off action of the vacuum arc-extinguishing chamber can be realized only by linkage matching of the eccentric wheel and the insulating transmission part between the transmission shaft of the circuit breaker and the vacuum arc-extinguishing chamber, the whole structure is simple, the assembly and the processing are convenient, and the production cost and the mechanism fault probability are effectively reduced.

Description

Vacuum circuit breaker

Technical Field

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

Background

The vacuum circuit breaker is named because the arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum; the arc extinguishing device has the advantages of small volume, light weight, suitability for frequent operation and no maintenance in arc extinguishing, and is more popular in power distribution networks. The vacuum circuit breaker is an indoor distribution device in a 3-10 kV 50Hz three-phase alternating current system, can be used for protecting and controlling electrical equipment in industrial and mining enterprises, power plants and substations, is particularly suitable for use places requiring oilless maintenance and frequent operation, and can be arranged in a centrally installed switchgear, a double-layer cabinet and a fixed cabinet to be used for controlling and protecting high-voltage electrical equipment.

The vacuum circuit breaker generally comprises a vacuum arc-extinguishing chamber and a transmission mechanism, wherein the transmission mechanism is mainly used for being linked with a movable end conducting rod in the vacuum arc-extinguishing chamber, so that a movable contact and a fixed contact in the vacuum arc-extinguishing chamber are separated and combined, as disclosed in Chinese patent with publication number CN202423109U in the prior art, the connection and transmission device of the vacuum circuit breaker comprises a main shaft supporting seat, a cam, a rolling bearing, a pin shaft, a baffle plate, a compression spring and the like, and more parts lead to complicated assembly process, improve the precision requirement on each part and are not easy to process.

Disclosure of Invention

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

The technical scheme adopted by the utility model is as follows: the utility model provides a vacuum circuit breaker, includes the frame, be provided with isolator mechanism and circuit breaker mechanism in the frame, circuit breaker mechanism is including circuit breaker transmission shaft, vacuum interrupter and circuit breaker transmission assembly, vacuum interrupter is including moving end conducting rod, circuit breaker transmission assembly is including insulating driving medium and setting up in the epaxial eccentric wheel of circuit breaker transmission, eccentric wheel and circuit breaker transmission shaft synchronous rotation, insulating driving medium is including the pull rod portion of being connected with moving end conducting rod and the framework portion of eccentric wheel linkage, the eccentric wheel is including first butt end and the second butt end that can with framework portion upper end looks butt, distance between first butt end and the axle center of circuit breaker transmission shaft is greater than distance between second butt end and the axle center of circuit breaker transmission shaft, when first butt end and the upper end looks butt of framework portion, vacuum interrupter is the brake-separating state, when second butt end and the upper end looks butt of framework portion, the vacuum interrupter is the brake-closing state.

The vacuum interrupter upper end is provided with insulating support, insulating support is including fixed supporting part and the insulating skirt of vacuum interrupter, be provided with the through-hole that is used for supplying pull rod portion to pass on the insulating skirt.

And a pressing flange is arranged at one end, close to the vacuum arc-extinguishing chamber, of the pull rod part, and a spring is arranged on the pull rod part between the pressing flange and the insulating skirt part.

The lower part of the through hole is connected with an adjusting piece in a threaded manner, and two ends of the spring are respectively abutted to the abutting flange and the adjusting piece.

The lower part of through-hole is provided with the internal thread, the regulating part is including adjusting part and butt portion, adjusting part is provided with the external screw thread with the internal thread adaptation.

The vacuum arc-extinguishing chamber further comprises a shell, a moving contact, a fixed contact and a fixed end conducting rod connected with the fixed contact, wherein the shell comprises an insulating cylinder body, a moving end cover plate and a fixed end cover plate.

A shielding cylinder is arranged between the insulating cylinder body and the moving contact and between the insulating cylinder body and the fixed contact.

The isolating switch mechanism comprises an isolating static contact seat, an isolating knife switch, an isolating transmission shaft and an isolating transmission assembly, wherein the isolating transmission assembly is used for enabling the isolating knife switch to be switched on or off with the isolating static contact seat when the isolating transmission shaft rotates.

An isolation operating mechanism is arranged on one side of the frame and is in linkage fit with the isolation transmission shaft.

And one side of the frame is provided with a breaker operating mechanism which is in linkage fit with a breaker transmission shaft.

The beneficial effects of the utility model are as follows: according to the utility model, the switching-on and switching-off action of the vacuum arc-extinguishing chamber can be realized only by linkage matching of the eccentric wheel and the insulating transmission part between the transmission shaft of the circuit breaker and the vacuum arc-extinguishing chamber, the whole structure is simple, the assembly and the processing are convenient, and the production cost and the mechanism fault probability are effectively reduced.

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 diagram of the present utility model;

FIG. 2 is a schematic view of a portion of a circuit breaker mechanism of the present utility model;

fig. 3 is a partial cross-sectional view of the circuit breaker mechanism of the present utility model;

FIG. 4 is a partial schematic view of a circuit breaker mechanism of the present utility model;

FIG. 5 is a second schematic illustration of the present utility model;

in the figure, 1-rack, 2-disconnector mechanism, 3-circuit breaker mechanism, 31-circuit breaker transmission shaft, 32-vacuum interrupter, 33-circuit breaker transmission assembly, 4-insulating transmission piece, 41-pull rod part, 411-pressing flange, 42-frame part, 5-eccentric wheel, 51-first abutting end, 52-second abutting end, 6-insulating bracket, 61-supporting part, 62-insulating skirt part, 621-through hole, 7-spring, 8-adjusting piece, 81-adjusting part, 82-abutting part, 9-moving contact, 10-static contact, 11-static end conducting rod, 12-insulating cylinder, 13-moving end cover plate, 14-static end cover plate and 15-shielding cylinder.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present utility model more apparent.

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 but different entities or different parameters, and it is noted that the "first" and "second" are only 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 one by one.

The terms of direction and position in the present utility model, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer only to the direction or position of the drawing. Accordingly, directional and positional terms are used to illustrate and understand the utility model and are not intended to limit the scope of the utility model.

As shown in fig. 1 to 5, an embodiment of the present utility model is provided:

the utility model provides a vacuum circuit breaker, includes frame 1, be provided with isolator mechanism 2 and circuit breaker mechanism 3 on the frame 1, circuit breaker mechanism 3 is including circuit breaker transmission shaft 31, vacuum interrupter 32 and circuit breaker transmission assembly 33, vacuum interrupter 32 is including moving end conducting rod 321, and moving end conducting rod 321 circumference is provided with the bellows, and the bellows generally adopts the thickness to be between 0.1mm to 0.2mm stainless steel material to make, vacuum interrupter 32 still includes casing, moving contact 9, stationary contact 10 and the stationary end conducting rod 11 of being connected with stationary contact 10, the casing is including insulating barrel 12, moving end apron 13 and stationary end apron 14, and insulating barrel 12 can be made with materials such as glass, pottery, glass ceramics, vacuum interrupter 32 through the insulating and arc extinguishing performance that with the help of the vacuum is good, and in the embodiment, moving contact 9 and stationary contact 10 can adopt cylindrical contact, horizontal magnetic field contact, vertical magnetic field contact etc. have excellent effect's contact. A shielding cylinder 15 is arranged between the insulating cylinder 12 and the moving contact 9 as well as between the moving contact 10, and the shielding cylinder 15 can be made of oxygen-free copper, stainless steel, electrical pure iron or copper-chromium alloy and other materials.

When no external force is applied, the movable contact generates a closing force to the cavity of the vacuum arc-extinguishing chamber under the action of atmospheric pressure, so that the vacuum arc-extinguishing chamber is closed with the fixed contact, and the closing force is called self-closing force. The breaker transmission assembly 33 comprises an insulation transmission member 4 and an eccentric wheel 5 arranged on a breaker transmission shaft 31, the eccentric wheel 5 and the breaker transmission shaft 31 synchronously rotate, the insulation transmission member 4 comprises a pull rod portion 41 connected with a movable end conducting rod 321 and a frame portion 42 linked with the eccentric wheel 5, the frame portion 42 is a rectangular frame, the longer side of the frame portion is located in the longitudinal direction, the eccentric wheel 5 comprises a first abutting end 51 and a second abutting end 52 which can abut against the inner wall of the upper end of the frame portion 42, wherein the distance between the first abutting end 51 and the axis of the breaker transmission shaft 31 is larger than the distance between the second abutting end 52 and the axis of the breaker transmission shaft 31, when the breaker transmission shaft 31 rotates, the eccentric wheel 5 is driven to rotate, the first abutting end 51 abuts against the inner wall of the upper end of the frame portion 42, the vacuum arc extinguishing chamber 32 is in a separated state, the frame portion 42 is jacked up, the first abutting end 41 is driven to move upwards, and then the upper end 321 is driven to separate the pull rod contact from the movable contact 10; when the second abutting end 52 abuts against the inner wall of the upper end of the frame 42, the vacuum interrupter 32 is in a closed state, and specifically, the moving contact 9 and the fixed contact 10 are closed under the action of self-closing force. The vacuum circuit breaker can realize the opening and closing action of the vacuum arc-extinguishing chamber 32 only through linkage cooperation between the eccentric wheel 5 and the insulating transmission part 4 and between the circuit breaker transmission shaft 31 and the vacuum arc-extinguishing chamber 32, has a simple integral structure, is convenient to assemble and process, and effectively reduces the production cost and the mechanism fault probability.

Further, the upper end of the vacuum interrupter 32 is provided with an insulating bracket 6, the insulating bracket 6 comprises a supporting portion 61 and an insulating skirt portion 62 fixed with the vacuum interrupter 32, and a through hole 621 for the pull rod portion 41 to pass through is formed in the insulating skirt portion 62, so that the insulating performance is improved, and the charging of the transmission shaft 31 of the circuit breaker is avoided, and a safety accident is caused. The pull rod portion 41 is close to vacuum interrupter 32 one end or movable end conducting rod 321 is close to pull rod portion 41 one end and is provided with and supports and press flange 411, be provided with spring 7 on the pull rod portion 41 between support and press flange 411 and the insulating skirt 62, spring 7 can make moving contact 9 and static contact 10 stability when closed better, through hole 621 lower part threaded connection has regulating part 8, spring 7 both ends butt respectively in support and press flange 411 and regulating part 8, moving contact 9 and static contact 10 can appear wearing and tearing after long-term action, can promote spring 7 through rotating regulating part 8 this moment to the elastic support power of movable end conducting rod 321, guarantees the stability when moving contact 9 and static contact 10 are closed. Specifically, the lower portion of the through hole 621 is provided with an internal thread, the adjusting member 8 includes an adjusting portion 81 and an abutting portion 82, the adjusting portion 81 is provided with an external thread adapted to the internal thread, and the adjusting portion 81 may be hexagonal.

Specifically, the isolating switch mechanism 2 comprises an isolating static contact seat, an isolating knife 16, an isolating transmission shaft and an isolating transmission assembly, the isolating transmission assembly is used for enabling the isolating knife to be switched on or off with the isolating static contact seat when the isolating transmission shaft rotates, the isolating switch mechanism 2 can refer to the isolating switch mechanism with excellent breaking effect in the prior art, an isolating operation mechanism is arranged on one side of the frame 1 and is in linkage fit with the isolating transmission shaft, a circuit breaker operation mechanism is arranged on one side of the frame 1 and is in linkage fit with the circuit breaker transmission shaft 31, and the isolating operation mechanism and the circuit breaker operation mechanism are also common mechanisms in the field and are not described in detail herein.

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

1. The vacuum circuit breaker comprises a frame (1), wherein a disconnecting switch mechanism (2) and a circuit breaker mechanism (3) are arranged on the frame (1), the circuit breaker mechanism (3) comprises a circuit breaker transmission shaft (31), a vacuum arc-extinguishing chamber (32) and a circuit breaker transmission assembly (33), the vacuum arc-extinguishing chamber (32) comprises a movable end conducting rod (321), and the vacuum circuit breaker comprises an insulating transmission part (4) and an eccentric wheel (5) arranged on the circuit breaker transmission shaft (31), the eccentric wheel (5) and the circuit breaker transmission shaft (31) synchronously rotate, the insulating transmission part (4) comprises a pull rod part (41) connected with the movable end conducting rod (321) and a frame body part (42) linked with the eccentric wheel (5), the eccentric wheel (5) comprises a first abutting end (51) and a second abutting end (52) which can be abutted with the upper end of the frame body part (42), the first abutting end (51) and the second abutting end (31) are in a state of being greater than the axial center of the first abutting end (52) of the circuit breaker transmission shaft (31), when the second abutting end (52) abuts against the upper end of the frame body (42), the vacuum arc-extinguishing chamber (32) is in a closing state.

2. A vacuum circuit breaker according to claim 1, characterized in that the upper end of the vacuum interrupter (32) is provided with an insulating bracket (6), the insulating bracket (6) comprises a supporting part (61) fixed with the vacuum interrupter (32) and an insulating skirt part (62), and the insulating skirt part (62) is provided with a through hole (621) for passing through the pull rod part (41).

3. A vacuum circuit breaker according to claim 2, characterized in that the pull rod part (41) is provided with a pressing flange (411) near one end of the vacuum interrupter (32), and the pull rod part (41) between the pressing flange (411) and the insulating skirt part (62) is provided with a spring (7).

4. A vacuum circuit breaker according to claim 3, wherein the lower part of the through hole (621) is connected with an adjusting member (8) by screw thread, and two ends of the spring (7) are respectively abutted against the abutting flange (411) and the adjusting member (8).

5. A vacuum circuit breaker according to claim 4, characterized in that the lower part of the through hole (621) is provided with an internal thread, the adjusting member (8) comprises an adjusting portion (81) and an abutment portion (82), and the adjusting portion (81) is provided with an external thread adapted to the internal thread.

6. A vacuum interrupter according to claim 1, wherein the vacuum interrupter (32) further comprises a housing, a moving contact (9), a stationary contact (10) and a stationary conductive rod (11) connected to the stationary contact (10), the housing comprising an insulating cylinder (12), a moving end cover plate (13) and a stationary end cover plate (14).

7. A vacuum circuit breaker according to claim 6, characterized in that a shielding cylinder (15) is arranged between the insulating cylinder (12) and the moving contact (9) and the stationary contact (10).

8. The vacuum circuit breaker according to claim 1, wherein the isolating switch mechanism (2) comprises an isolating static contact seat, an isolating knife, an isolating transmission shaft and an isolating transmission assembly, and the isolating transmission assembly is used for enabling the isolating knife to be switched on and off with the isolating static contact seat when the isolating transmission shaft rotates.

9. A vacuum circuit breaker according to claim 1, characterized in that an isolating operation mechanism is arranged on one side of the frame (1), and the isolating operation mechanism is in linkage fit with an isolating transmission shaft.

10. A vacuum circuit breaker according to claim 1, characterized in that the frame (1) is provided on one side with a circuit breaker operating mechanism which cooperates with a circuit breaker transmission shaft (31).