Run-on plate

Abstract

The invention discloses a run-on plate which comprises an arc striking sheet, wherein the arc striking sheet is arranged below a moving contact obliquely. The lower end of the arc striking sheet is connected with the lower end of an arc extinguish chamber, and the upper end of the arc striking sheet is arranged close to the moving contact. The upper end of an arc striking supporting plate is connected with the upper end of the arc striking sheet, and the lower end of the arc striking supporting plate makes contact with the lower end of a bimetallic strip. A roughly horizontal transition section is arranged on the connection portion of the arc striking sheet and the arc striking supporting plate, and the transition section separates the top end of the arc striking sheet and the top end of the arc striking supporting plate in the horizontal direction. According to the run-on plate, due to the fact that the transition section is arranged on the connection portion of the arc striking sheet and the upper end of the arc striking supporting plate, the arc striking supporting plate and the top end of the arc striking sheet can be separated with a certain distance; the intensity of a self-excitation magnetic field above the arc striking plate can be enhanced, the arc extinguishing effect is further enhanced, and the on-off performance of a switch is improved; by enabling the middle portion of the arc striking plate to be bent to one side where a wiring board locates and to make contact with the wiring board, conductive connecting components can be saved, and assembling efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of arc striking for circuit breakers, in particular to an arc striking plate. 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 arc strike plates that conduct current in the chamber where the move and static contacts are located. A self-exciting magnetic field is generated around it, and the arc is gui...

AI Technical Summary

Problems solved by technology

[0005] However, since the arc strike plate and the arc strike support of this utility model are arranged facing each other, 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 strike plate basically cancel each other

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 strike plate in this patent document 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 Move towards the opposite direction of the arc extinguishing chamber. In this way, instead of promoting the arc ignition, the extension part hinders the arc from moving to the arc extinguishing chamber, further reducing the arc ignition effect, resulting in poor disconnection performance of the switch. Difference

In addition, since the arc strike bracket in this patent document is set between the bimetal and the arc strike, and the lower end of the bimetal is connected to the terminal block at the output (or input) end through a conductive connector, this design makes the circuit breaker There are many internal parts, the assembly is difficult, and the production efficiency is low

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