CN111681927A

CN111681927A - Buffer device of low-voltage circuit breaker

Info

Publication number: CN111681927A
Application number: CN202010487300.2A
Authority: CN
Inventors: 付志超; 张海根; 程少勇
Original assignee: Shanghai Electric Group Corp
Current assignee: Shanghai Electric Group Corp
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2020-09-18

Abstract

The invention discloses a buffer device of a low-voltage circuit breaker, which is characterized by comprising a buffer base, a buffer and a buffer connecting rod, wherein the buffer base is arranged in the circuit breaker; the buffer is fixed on the buffer base; the buffer connecting rod is connected with the main shaft of the circuit breaker, the main shaft is connected with the moving contact of the circuit breaker, the main shaft drives the buffer connecting rod to rotate when the circuit breaker is switched off, the buffer is arranged on the rotating path of the buffer connecting rod, and the buffer connecting rod impacts the buffer to realize the rebound prevention effect. The invention has the beneficial effects that: the breaker moving contact opening rebound distance is greatly reduced by selecting different types of buffers; the service life of the buffer is far longer than that of the buffer device of the existing circuit breaker; the buffer is separated from the breaker mechanism body, and the buffer is convenient to mount and dismount.

Description

Buffer device of low-voltage circuit breaker

Technical Field

The invention relates to a buffer device of a low-voltage circuit breaker, belonging to the technical field of electrical equipment.

Background

With the increase of power consumption and the appearance of more and more high-power loads, various indexes of the low-voltage circuit breaker are required to be continuously improved, and particularly, the short-tolerance index of the master control circuit breaker is required to be improved for realizing the selective protection of a system. The existing low-voltage circuit breaker industry mostly adopts a mode of increasing a moving contact spring force value, and the contact can not be repelled when the short-time current tolerance is ensured. In order to ensure the breaking capacity, the brake separating force of the system is inevitably increased, so that the brake separating speed of the movable contact is increased. The circuit breaker mechanism is mostly made of rigid materials, if the circuit breaker does not have a rebound prevention device or the device does not work, the rebound amount of the moving contact can be increased, the effective distance between the moving contact and the static contact can be sharply reduced due to excessive rebound, and electric arc reignition can occur in severe cases, so that the contact is burnt, and even more severe consequences are caused. Therefore, the problem that the rebound quantity of the moving contact of the breaker in the opening process is too large is always a problem of key research of electrical engineering workers.

In order to solve the above problems, in the prior art, as shown in fig. 1, a suspension arm c is fixedly installed at a front position of an inner surface of a side plate, a throwing block a is hinged to the surface of the suspension arm c, the throwing block a can rotate along the surface of the suspension arm c, energy is consumed by the striking of the throwing block a and a limiting shaft b to reduce the rebound of a movable contact, and the rebound of the rebound prevention mode is limited and the service life is short.

In summary, the prior art has the following disadvantages:

1. due to the limitation of the internal structure and size of the existing low-voltage circuit breaker, the existing buffer device is poor in rebound prevention effect when the circuit breaker is opened;

2. the service life of the buffer device of the existing low-voltage circuit breaker is far shorter than that of other parts of the circuit breaker, and the buffer device is a main factor for limiting the service life of the circuit breaker.

Disclosure of Invention

The invention aims to solve the technical problem that the rebound quantity of a moving contact of the traditional breaker is overlarge in the opening process.

In order to solve the technical problem, the technical scheme of the invention is to provide a buffer device of a low-voltage circuit breaker, which is characterized by comprising a buffer base, a buffer and a buffer connecting rod, wherein the buffer base is arranged in the circuit breaker; the buffer is fixed on the buffer base; the buffering connecting rod with the main shaft of circuit breaker is connected, the main shaft is connected with the moving contact of circuit breaker, the main shaft drives the buffering connecting rod and rotates when the circuit breaker separating brake, the buffer is located on the buffering connecting rod rotation route, buffering connecting rod striking buffer realizes preventing the rebound effect.

Preferably, the buffer base is disposed on an arc extinguishing chamber housing of the circuit breaker or on a fixed base plate of the circuit breaker.

Preferably, the two or one set of buffer devices are arranged at two sides or one side in the circuit breaker. .

Preferably, the buffer is fixed on the buffer base through a pressure plate.

Preferably, the damper is a spring damper, a hydraulic damper, a pneumatic damper, or a rubber damper.

The invention has the beneficial effects that:

1. the breaker moving contact opening rebound distance is greatly reduced by selecting different types of buffers;

2. the service life of the buffer is far longer than that of the buffer device of the existing circuit breaker, taking the service life of the hydraulic buffer as an example, the service life of the hydraulic buffer can reach tens of thousands of times and far exceeds the service life of the body of the existing circuit breaker;

3. the buffer is separated from the breaker mechanism body, the buffer is convenient to install and detach, and the maintenance and the replacement of the buffer can be realized without detaching the breaker mechanism body.

Drawings

FIG. 1 is a prior art schematic;

fig. 2 is a schematic structural diagram of a low-voltage circuit breaker provided in this embodiment;

wherein, the left side is a front view, and the right side is a side view;

FIG. 3 is a schematic view of a bumper mount;

wherein D represents a screw hole.

Detailed Description

In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

Examples

This example is a buffer of low voltage circuit breaker (hereinafter for short circuit breaker), connects buffering connecting rod and buffer through the mechanism main shaft to reach the purpose that the moving contact kick-backed when reducing the circuit breaker separating brake, realize preventing springback more effectively, improve life.

The specific technical scheme for realizing the aim is as follows: two damping devices are arranged on both sides of the low-voltage circuit breaker, as shown in fig. 2. The buffer device comprises a buffer base 1, a buffer 2, a buffer connecting rod 3 and other components, wherein the buffer base 1 can be a part of an arc extinguish chamber shell 4 of the circuit breaker and also can be a part of a fixed bottom plate 5 of the circuit breaker; the buffer 2 is fixed on the buffer base 1 through a pressure plate 6 (as shown in fig. 3), and the structural form of the buffer 2 can be selected from various forms, including but not limited to a spring buffer, an oil buffer, a hydraulic buffer, a pneumatic buffer, a rubber buffer, etc.; the buffer connecting rod 3 is connected with a main shaft of the circuit breaker, the main shaft is connected with a movable contact of the circuit breaker, the main shaft drives the buffer connecting rod 3 to rotate during brake opening, and the buffer connecting rod 3 impacts the buffer 2 to achieve the rebound prevention effect.

Claims

1. The buffer device of the low-voltage circuit breaker is characterized by comprising a buffer base (1), a buffer (2) and a buffer connecting rod (3), wherein the buffer base (1) is arranged in the circuit breaker; the buffer (2) is fixed on the buffer base (1); buffering connecting rod (3) with the main shaft of circuit breaker is connected, the main shaft is connected with the moving contact of circuit breaker, the main shaft drives buffering connecting rod (3) and rotates when the circuit breaker separating brake, buffer (2) are located on buffering connecting rod (3) rotation route, buffering connecting rod (3) striking buffer (2) are realized preventing the effect of kick-backing.

2. A damping device for low-voltage circuit breakers according to claim 1, characterized in that the damper base (1) is provided on the arc chamber casing (4) of the circuit breaker or on the fixed base plate (5) of the circuit breaker.

3. A buffer device for low-voltage circuit breakers as claimed in claim 2, characterized in that said buffer device is provided in two or more sets, on either side or on one side of the interior of the circuit breaker.

4. A damping device for low-voltage circuit breakers according to claim 3, characterized in that said damper (2) is fixed to the damper base (1) by means of a pressure plate (6).

5. A damping device for low-voltage circuit breakers according to claim 4, characterized in that said damper (2) is a spring damper, a hydraulic damper, a pneumatic damper or a rubber damper.