Arc ignition structure reinforcing self-excitation magnetic field intensity

Abstract

The invention discloses an arc ignition structure reinforcing self-excitation magnetic field intensity. The arc ignition structure comprises an arc-igniting sheet which is arranged below a moving contact in an inclining way. The lower end of the arc-igniting sheet is connected with the lower end of an arc-extinguishing chamber. The upper end of the arc-igniting sheet is arranged closely to the moving contact which is connected with a wiring board via flexible coupling. One side, which is far from the arc-extinguishing chamber, of the arc-igniting sheet is provided with a connecting plate which is vertically arranged. The upper end of the connecting plate is connected with the upper end of the arc-igniting sheet and flexible coupling, and the lower end of the connecting plate is connected with the lower end of a bimetallic sheet in a contacting way. The upper end of the bimetallic sheet is connected with the wiring board in a spacing way. One part of current conducted from the moving contact flows to the wiring board, and another part of current moves downwardly along the arc-igniting sheet and the connecting plate. A self-excitation magnetic field generated by the arc-igniting sheet and the connecting plate is overlaid on one side, which is close to the moving contact, of the upper end of the arc-igniting sheet, and is intensified so that moving speed of an arc is accelerated, and a phenomenon that the arc stagnates below the moving contact is eliminated. Therefore, an arc-distinguishing effect is intensified, and on / off performance of a switch is greatly enhanced.

Description

technical field [0001] The invention relates to the technical field of arc striking for circuit breakers, in particular to an arc striking structure for enhancing the strength of a self-excited magnetic field. Background technique [0002] When the moving and static contacts in the circuit breaker are separated due to a fault such as a short circuit in the circuit, an arc will be generated between the moving and static contacts, which delays the opening time of the switch, reduces the breaking performance of the switch, and even causes the circuit breaker to break. The load and circuit breaker components in the battery are severely burned. [0003] In order to make the arc generated when the moving and static contacts separate quickly and smoothly be introduced into the grid arc extinguishing chamber to be extinguished, the traditional method is to set a number of conducting arcs in the chamber where the moving and static contacts are located. A self-exciting magnetic field...

AI Technical Summary

Problems solved by technology

[0005] However, since the arc striker and the arc striker support are arranged facing each other in the above arc strike structure, the current directions of the two at the contact end are roughly opposite, and the distance is very close, so that the self-excited magnetic fields above the arc striker basically cancel each other out

This makes the self-exciting magnetic field used to guide the arc to the arc extinguishing chamber above the contact point too weak, so that the arc will stagnate under the moving contact, which will cause the arc to move to the arc extinguishing chamber. When the speed is slowed down, the off time of the switch will be extended, reducing the breaking performance of the switch

In addition, since the upper end of the arc striker is also provided with an extension end extending toward the moving contact, the direction of the current in the extension end is away from the arc extinguishing chamber, and the direction of the self-excited magnetic field generated by it is also to guide the arc toward the arc extinguishing chamber. In this way, instead of promoting the arc ignition, the extension part hinders the movement of the arc to the arc extinguishing chamber, further reduces the arc ignition effect, and leads to poor disconnection performance of the switch, especially It is even worse for some high current circuits

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