Circulating air arc-control device for small breaker

Abstract

The invention discloses a circulating air arc-control device for a small breaker. The circulating air arc-control device comprises a shell, a grating sheet arc extinguish chamber, an upper baffle, a lower baffle, an air outlet and a run-on plate, wherein the grating sheet arc extinguish chamber, the upper baffle, the lower baffle, the air outlet and the run-on plate are arranged in the shell, one sides of the upper baffle and the lower baffle are buckled with the grating sheet arc extinguish chamber, and arcing rings are arranged in the upper baffle and the lower baffle; a necking is formed in the tail end of each arcing ring and is matched with an electric arc of the grating sheet arc extinguish chamber, and the air outlet is arranged at the bottom of the grating sheet arc extinguish chamber; after the electric arc is generated and leaves away from a contact, the electric arc enters the grating sheet arc extinguish chamber along the run-on plate and the necking sequentially, and gas is discharged by the air outlet after the arc extinction. The circulating air arc-control device provided by the invention is good in sealing capability, is capable of preventing the electric arc from stampeding and guaranteeing the directivity of magnetic blow-out and air-blowing, namely, the reserve blowing function of the electric arc can be prevented, the phenomenon that the electric arc is effectively driven to enter the grating sheet arc extinguish chamber and is quenched, the electric arc is reburnt and punched on the back can be prevented, and the electric arc voltage can be quickly improved, therefore, the good limit effect can be achieved.

Description

technical field [0001] The invention relates to the field of low-voltage electrical industry, in particular to an arc extinguishing device with good sealing performance for a small circuit breaker, in particular to a circular airflow arc extinguishing device for a small circuit breaker. Background technique [0002] The existing miniature circuit breaker arc extinguishing system is extremely poorly closed and cannot prevent the arc from running around; without the function of magnetic blowing and air blowing, the directionality of the magnetic field and air flow field cannot be guaranteed, and it is easy to cause back blowing and affect the effectiveness of the driving force of the arc ; Can not guarantee that the arc is effectively pushed into the grid arc extinguishing chamber device and the arc is effectively extinguished in the grid arc extinguishing chamber device; and the current limiting performance of the existing grid arc extinguishing system is extremely poor or h...

AI Technical Summary

Problems solved by technology

[0002] The existing miniature circuit breaker arc extinguishing system is extremely poorly closed and cannot prevent the arc from running around; without the function of magnetic blowing and air blowing, the directionality of the magnetic field and air flow field cannot be guaranteed, and it is easy to cause back blowing and affect the effectiveness of the driving force of the arc ; It cannot guarantee that the arc is effectively pushed into the grid arc extinguishing chamber device and the arc is effectively extinguished in the grid arc extinguishing chamber device; and the current limiting performance of the existing grid arc extinguishing system is extremely poor or has no current limiting function at all

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