Novel breaker arc extinguishing structure

Abstract

The invention relates to a novel breaker arc extinguishing structure which is installed at the upper part of an independent group of contact system in a breaker body, and mainly comprises an arc extinguish chamber, a flash barrier and a filtering top cover which are assembled and then connected by screws. The novel breaker arc extinguishing structure is convenient and reliable in self assembly and the assembly of a low-voltage circuit breaker, is provided with a combined-type filtering device, is rapid and thorough in arc extinguishing and full in filtering and cooling, improves the breaking performance of the low-voltage circuit breaker, and eliminates the harmful influence for the circuit breaker and human body when electric arc escapes.

Description

technical field [0001] The invention relates to a novel arc extinguishing structure of a circuit breaker, which belongs to the technical field of mechatronics low-voltage electrical appliance manufacturing. Background technique [0002] For an important component in low-voltage electrical appliances - low-voltage circuit breaker, it is used to switch on and off the current in the grid circuit, and has multiple protection functions. When a fault current occurs in the circuit, and the current value exceeds a certain protection setting range, the dynamic and static contacts inside the circuit breaker will open quickly, and an arc will be generated between the contacts. Usually, there will be an arc extinguishing device in the moving direction of the arc, and the arc will When it is generated, it will stagnate for a while, and under the influence of the magnetic field and aerodynamic force in the arc extinguishing device, it will move along the arc striker to a group of arc isol...

AI Technical Summary

Problems solved by technology

[0003] The existing circuit breaker arc extinguishing device only has a set of simple arc barriers, and the arc is separated and guided by them and then enters another set of insulating arc barriers with a smaller number in order to achieve arc extinction by using space and distance. The effect is not ideal, and the residual arc is often sprayed out of the arc extinguishing chamber, which is more likely to cause personal accidents and electrical accidents; at the same time, due to the slow moving speed of the arc, it also inhibits the improvement of the breaking index of the circuit breaker; on the other hand, the existing circuit breaker extinguishing The arc device adopts a left and right assembly structure. When assembling, it is difficult to align multiple sets of arc-blocking grids with the falling slots, and installation is difficult. After assembly, the seams at the top of the arc-extinguishing device are completely exposed outside the circuit breaker body, and sometimes there are seams Dislocation and many other defects

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