CN215770986U

CN215770986U - Circuit breaker divide-shut brake anti-rebound mechanism

Info

Publication number: CN215770986U
Application number: CN202121011628.3U
Authority: CN
Inventors: 张雨
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-12
Filing date: 2021-05-12
Publication date: 2022-02-08
Anticipated expiration: 2031-05-12

Abstract

The utility model discloses a circuit breaker opening and closing anti-rebound mechanism, wherein a circuit breaker comprises an arc extinguish chamber, a fixed contact, a movable contact and a moving rod connected with the movable contact, the moving rod is connected with an opening mechanism and a closing mechanism, the opening mechanism and the closing mechanism are used for realizing opening and closing of the movable contact by driving a repulsion plate to move up and down, the opening mechanism comprises an opening coil and an opening retaining device, the closing mechanism comprises a closing coil and a closing retaining device, a closing reducing ring is arranged on the closing retaining device close to the side of the repulsion plate, and an opening reducing ring is arranged on the opening retaining device close to the side of the repulsion plate; the switching-on reducing ring induces a magnetic force opposite to that of the switching-on coil when the moving contact is switched on, and the switching-off reducing ring induces a magnetic force opposite to that of the switching-off coil when the moving contact is switched off; the breaker opening and closing switch anti-rebound mechanism has the advantages of good deceleration effect, strong practicability, good economy and the like through non-contact electromagnetic induction deceleration and optimized structural design.

Description

Circuit breaker divide-shut brake anti-rebound mechanism

Technical Field

The utility model belongs to the field of circuit breakers, and particularly relates to a switch-on and switch-off anti-rebound mechanism of a circuit breaker.

Background

Vacuum circuit breakers are so named because the arc-extinguishing medium and the insulating medium in the contact gap after arc extinction are both high vacuum. The vacuum circuit breaker has the advantages of small volume, light weight, suitability for frequent operation, no need of maintenance after arc extinction and the like, is used for protecting and controlling electrical equipment in industrial and mining enterprises, power plants and transformer substations, is particularly suitable for use places requiring no oiling, less maintenance and frequent operation, and is relatively popularized in three-phase mating power grids of 3-35 kV and 50 Hz.

The vacuum circuit breaker of the electromagnetic repulsion force driving system has the advantages of high closing and opening speed and the like, so that the application of the vacuum circuit breaker is more and more extensive. However, the existing vacuum circuit breakers of the electromagnetic repulsion force driving system in the market at present have obvious defects: firstly, mechanical collision deceleration is poor in deceleration effect, secondary noise is easy to generate, and an original system needs to be changed; secondly, the speed is extremely high when the closing is stopped, the contact of the arc extinguish chamber is easy to wear, and the service life is short; the structure is complex and is easily affected by element processing errors; and fourthly, the closing holding magnet and the opening holding magnet are not shared, and the economical efficiency is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a switch-on and switch-off anti-rebound mechanism of a circuit breaker, which has the advantages of good deceleration effect, strong practicability, good economy and the like through non-contact electromagnetic induction deceleration and optimized structural design.

The utility model discloses a switch-on and switch-off anti-rebound mechanism of a circuit breaker, the circuit breaker comprises an arc extinguish chamber, a static contact and a moving contact which are arranged in the arc extinguish chamber, and a moving rod which is fixedly connected with the moving contact, the moving rod is connected with a repulsion plate and a switching-off mechanism and a switching-on mechanism which drive the repulsion plate to move to realize the switching-on and switching-off of the moving contact, the switching-off mechanism comprises a switching-off coil and a switching-off holding device, the switching-on mechanism comprises a switching-on coil and a switching-on holding device, the opening coil and the closing holding device are both arranged on the side of the repulsion plate close to the arc extinguishing chamber, the closing coil and the opening holding device are both arranged on the side of the repulsion plate away from the arc extinguishing chamber, a closing speed reducing ring is arranged on the closing holding device close to the repulsion plate side, and an opening speed reducing ring is arranged on the opening holding device close to the repulsion plate side; the switching-on reducing ring induces magnetic force opposite to that of the switching-on coil when the moving contact is switched on, and the switching-off reducing ring induces magnetic force opposite to that of the switching-off coil when the moving contact is switched off.

Preferably, the closing holding device and the opening holding device are provided with annular grooves on opposite sides respectively, the opening coil is arranged in the annular groove on the closing holding device, and the closing coil is arranged in the annular groove on the opening holding device.

Preferably, a permanent magnet is fixed on the repulsion disk, and two poles of the permanent magnet are respectively close to and far away from two sides of the arc extinguishing chamber towards the repulsion disk.

Preferably, the closing decelerating ring and the opening decelerating ring are a closing decelerating closing coil and an opening decelerating closing coil respectively.

Preferably, the opening holding device and the closing holding device are both provided with metal capable of being attracted by the permanent magnet.

The switch-on and switch-off anti-rebound mechanism of the circuit breaker has the beneficial effects that:

the closing reduction ring and the opening reduction ring are arranged, so that the repulsion disc is reduced in closing and opening of the moving contact, mechanical collision between the repulsion disc and the closing holding device or the opening holding device is avoided, or collision speed and force are reduced, and the problem that the repulsion disc rebounds in high-speed collision is avoided. On one hand, the mechanical collision noise generated in the process of closing or opening is avoided, on the other hand, the collision abrasion between the moving contact and the fixed contact in the process of closing is avoided, and the problems that the moving contact stops at a very high speed in the process of closing, so that the contact of the arc extinguish chamber is easily abraded and the service life is short are solved.

Drawings

FIG. 1 is a schematic diagram of a structure of a circuit breaker opening and closing anti-rebounding mechanism according to the technical solution of the present invention, that is, a schematic diagram of a closing state of an arc extinguishing chamber,

fig. 2 is a schematic diagram of the circuit breaker opening and closing anti-rebound mechanism in the arc extinguish chamber opening state according to the technical scheme of the utility model.

Detailed Description

In order to facilitate the understanding of the technical solutions of the present invention for those skilled in the art, the technical solutions of the present invention will be further described with reference to the drawings attached to the specification.

As shown in fig. 1, in the technical scheme of the utility model, the circuit breaker switching-on and switching-off anti-rebound mechanism comprises an arc extinguish chamber 1, a fixed contact 11 and a movable contact 12 which are arranged in the arc extinguish chamber 1, and a moving rod 100 fixedly connected with the movable contact. The moving rod 100 is connected with a repulsion plate 21 and a switching-off mechanism and a switching-on mechanism for driving the repulsion plate 21 to move up and down to realize the switching-on and switching-off of the moving contact 12 and the static contact 11. The opening mechanism or the closing mechanism drives the moving rod 100 to move through the repulsion plate 21, and the moving contact 12 fixed with the moving rod 100 moves away from or close to the static contact, so that opening and closing of the arc extinguish chamber are realized.

As shown in fig. 1 or fig. 2, the opening mechanism includes an opening coil 42 and an opening holding device 41. The closing mechanism includes a closing coil 32 and a closing holding device 31. The opening coil 42 and the closing holding device 31 are both arranged on the side of the repulsive disc 21 close to the arc extinguishing chamber 1. The closing coil 32 and the opening holding device 41 are both arranged on the side of the repulsive disc 21 away from the arc extinguishing chamber 1.

Based on the above technical solution, when switching on, the switching-on magnetic force is induced in the switching-on coil 32 by the current, and the switching-on magnetic force overcomes the magnetic force of the permanent magnet on the repulsive disc 21, so as to push the repulsive disc 21 to the switching-on holding device 31, and the repulsive disc 21 is attracted to the switching-on holding device 31, so that the moving contact 12 and the static contact 11 in the arc extinguish chamber 1 are kept in the switching-on state, and are kept in the switching-on state until the current is switched in the switching-off coil 42.

Based on the above technical solution, during opening, the opening coil 42 induces opening magnetic force through current, the opening magnetic force overcomes the magnetic force of the permanent magnet on the repulsive disc 21, the repulsive disc 21 is pushed to the opening retaining device 41, the repulsive disc 21 attracts the opening retaining device 41, so that the moving contact 12 is kept in an opening state with the fixed contact 11, and the moving contact is kept in the opening state until the current is connected to the closing coil 32.

In the present technical solution, the opposite side surfaces of the closing holding device 31 and the opening holding device 41 are respectively provided with an annular groove, the opening coil 42 is disposed in the annular groove on the closing holding device 31, and the closing coil 32 is disposed in the annular groove on the opening holding device 41. The closing coil 32 and the opening coil 42 are respectively embedded into the opening retaining device 41 and the closing retaining device 31, and the influence of element processing errors on a driving system is greatly reduced by optimizing the structural design, and meanwhile, the size of the whole structure is also reduced.

In the technical scheme, a permanent magnet 22 is fixed on the repulsion plate 21, and two poles of the permanent magnet 22 are respectively close to and far away from two sides of the arc extinguish chamber 1 towards the repulsion plate 21. The permanent magnet 22 in the repulsion plate 21 can provide holding force during closing and opening, so that the using amount of the magnet is greatly reduced, the economical efficiency is improved, the structure of the whole breaker is simplified, the failure rate is reduced, and the use cost is reduced.

The opening holding device 41 and the closing holding device 31 are both provided with metal that can be attracted by the permanent magnet. The arrangement of the permanent magnet and the metal simplifies the structure and reduces the cost.

As shown in fig. 1 and 2, in the present embodiment, the closing holding device 31 is provided with a closing decelerating ring 33 on the side close to the repulsive disc 21. The opening retaining device 41 is provided with an opening decelerating ring 43 near the repulsive force disc 21 side. The closing decelerating ring 33 and the opening decelerating ring 43 are a closing decelerating closing coil and an opening decelerating closing coil, respectively. The closing decelerating ring 33 induces a magnetic force opposite to that of the closing coil 33 when the movable contact 12 is closed. The opening decelerating ring 43 induces a magnetic force opposite to the opening coil 42 when the movable contact 12 is opened.

Based on the above technical solution, during closing, the repulsive disc 21 and the permanent magnet 22 thereon move to the closing holding device 31 side at the same time. Because of the movement of the repulsion disk 21 and the permanent magnet 22, a changing magnetic field is induced around the closing deceleration ring 33, according to the lenz law, a closing deceleration current is induced in the closing deceleration ring 33, the closing deceleration current induced in the closing deceleration ring 33 induces a closing deceleration magnetic force, the direction of the closing deceleration magnetic force induced by the closing current in the closing coil 32 is opposite, the closing deceleration magnetic force is used for overcoming the closing magnetic force, namely, a repulsion force is induced with the repulsion disk 21, so that the original movement speed of the repulsion disk 21 to the closing holding device 31 is changed, the speed of the repulsion disk 21 is sharply reduced, and the impact force of the repulsion disk 21 and the closing holding device 31 is almost 0. Therefore, the problem of mechanical collision between the repulsion disc 21 and the closing holding device 31 is effectively avoided, the problem of collision noise between the repulsion disc and the closing holding device 31 is avoided, the problem of abrasion between the closing holding device 31 and the repulsion disc is avoided, and the problem of abrasion caused by collision between a moving contact and a fixed contact is also avoided.

Based on the above technical solution, during opening, the repulsive disc 21 and the permanent magnet 22 thereon move to the opening holding device 41 side at the same time. Because of the movement of the repulsion disk 21 and the permanent magnet 22, a changing magnetic field is induced around the opening decelerating ring 43, according to the Lenz's law, an opening decelerating current is induced in the opening decelerating ring 43, the opening decelerating current induced in the opening decelerating ring 33 induces an opening decelerating magnetic force, the direction of the opening decelerating magnetic force is opposite to that of the opening magnetic force induced by the opening current in the opening coil 42, the opening decelerating magnetic force is used for overcoming the opening magnetic force, namely generating a repulsive force with the repulsion disk 21, so that the repulsion disk 21 changes the original moving speed towards the opening retaining device 41, the speed of the repulsion disk 21 is sharply reduced, and the impact force of the repulsion disk 21 and the opening retaining device 41 is almost ' 0 '. Therefore, the problem of mechanical collision between the repulsion plate 21 and the opening retaining device 41 is effectively avoided, the problem of collision noise between the repulsion plate and the opening retaining device 41 is avoided, and the problem of abrasion between the opening retaining device 41 and the repulsion plate is avoided.

According to the anti-rebounding mechanism for the opening and closing of the circuit breaker, the closing speed reducing ring and the opening speed reducing ring are arranged, so that the repulsion plate is decelerated in the closing and opening of the moving contact, the phenomenon that the repulsion plate is greatly collided with a closing holding device or an opening holding device in a mechanical mode is avoided, the speed of the repulsion plate close to the closing holding device or the opening holding device is reduced, the phenomenon that the repulsion plate is greatly collided with the closing holding device or the opening holding device is avoided, and the phenomenon that the repulsion plate is rebounded is avoided. On one hand, the mechanical collision noise generated in the process of closing or opening is avoided, on the other hand, the collision abrasion between the moving contact and the fixed contact in the process of closing is avoided, and the problems that the moving contact stops at a very high speed in the process of closing, so that the contact of the arc extinguish chamber is easily abraded and the service life is short are solved.

According to the technical scheme, the anti-rebound mechanism for the opening and closing of the circuit breaker can achieve the effect only by additionally arranging the closing speed reducing ring and the opening speed reducing ring, does not need to change the overall structure of the original circuit breaker, is convenient to modify and additionally arrange, and is low in cost and simple to install.

Technical solution of the utility model the present invention is described above with reference to the accompanying drawings by way of example, and it is to be understood that the specific implementation of the present invention is not limited to the above-described embodiments, and it is within the scope of the present invention to employ various insubstantial modifications of the method concept and technical solution of the present invention, or to directly apply the concept and technical solution of the present invention to other applications without modification.

Claims

1. A switch-on and switch-off anti-rebound mechanism of a circuit breaker comprises an arc extinguish chamber, a static contact and a moving contact which are arranged in the arc extinguish chamber, and a moving rod which is fixedly connected with the moving contact, it is characterized in that the motion rod is connected with a repulsion plate and a brake separating mechanism and a brake closing mechanism which drive the repulsion plate to move to realize the opening and closing of the moving contact, the switching-off mechanism comprises a switching-off coil and a switching-off holding device, the switching-on mechanism comprises a switching-on coil and a switching-on holding device, the opening coil and the closing holding device are both arranged on the side of the repulsion plate close to the arc extinguishing chamber, the closing coil and the opening holding device are both arranged on the side of the repulsion plate away from the arc extinguishing chamber, a closing speed reducing ring is arranged on the closing holding device close to the repulsion plate side, and an opening speed reducing ring is arranged on the opening holding device close to the repulsion plate side; the switching-on reducing ring induces magnetic force opposite to that of the switching-on coil when the moving contact is switched on, and the switching-off reducing ring induces magnetic force opposite to that of the switching-off coil when the moving contact is switched off.

2. The circuit breaker opening and closing anti-bounce mechanism according to claim 1, wherein annular grooves are respectively provided on the opposite sides of the closing holding device and the opening holding device, the opening coil is disposed in the annular groove on the closing holding device, and the closing coil is disposed in the annular groove on the opening holding device.

3. The circuit breaker opening and closing switch anti-bounce mechanism according to claim 1, wherein permanent magnets are fixed on the repulsion plate, and two poles of the permanent magnets are respectively close to and far away from two sides of the arc extinguish chamber towards the repulsion plate.

4. The circuit breaker opening and closing switch anti-bounce mechanism according to claim 1, wherein the closing deceleration ring and the opening deceleration ring are a closing deceleration closing coil and an opening deceleration closing coil, respectively.

5. The circuit breaker opening and closing switch anti-bounce mechanism according to claim 1, wherein both the opening holding device and the closing holding device are provided with metal capable of being attracted by a permanent magnet.