Arc extinguishing system and arc extinguishing chamber

Abstract

The invention provides an arc extinguishing chamber, which comprises two side plates and an arc extinguishing grid plate group fixedly arranged between the two side plates. The arc extinguishing gridplate group comprises a plurality of first arc extinguishing grid plates and a plurality of second arc extinguishing grid plates. The plurality of first arc extinguishing grid plates are arranged under the plurality of second arc extinguishing grid plates; the thickness of each first arc extinguishing grid plate is larger than that of each second arc extinguishing grid plate; and the space betweentwo adjacent first arc extinguishing grid plates is larger than the space between two adjacent second arc extinguishing grid plates. The invention also provides an arc extinguishing system, which comprises the arc extinguishing chamber and a static contact and a moving contact opposite to the arc extinguishing chamber. The moving contact can be contacted with or separated from the static contact.By carrying out differentiated setting on the thickness of each arc extinguishing grid plate of the arc extinguishing grid plate group and the space between two adjacent arc extinguishing grid plates, arc erosion resistance is improved, and electrical life is improved.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing system and an arc extinguishing chamber, and more specifically to an arc extinguishing system and an arc extinguishing chamber capable of improving the electrical life and the ability of grids to resist arc burning. Background technique [0002] The air arc at atmospheric pressure is the most common form of arc in low voltage switchgear. When closing and opening most of the relays, contactors, load switches and circuit breakers that use air as the arc-extinguishing medium, air arcs under atmospheric pressure will occur. The main existing arc extinguishing method is to extinguish the arc through the arc extinguishing grid. During the breaking process of the low-voltage switching device, the arc starts to move after experiencing the arc stagnation process, and the arc is transferred from the contact to the arc track and enters the arc...

AI Technical Summary

Problems solved by technology

[0004] 1. The thickness of the arc extinguishing grid is not set differently according to the arc energy distribution, resulting in the arc extinguishing grid in different areas or parts having basically the same arc burning resistance, so that the arc extinguishing grid located at the lower part has been completely or Most of them are burned, but the arc extinguishing grid on the upper part is still basically intact, resulting in the failure of the entire arc extinguishing chamber, short life of the arc extinguishing chamber, and short electrical life of the product

[0005] 2. The gap between two adjacent arc extinguishing grids is not related to the thickness of the arc extinguishing grid. When the arc is broken, the gap between the grids is small, resulting in the formation of metal bridges due to heat accumulation. The arc extinguishing grids are shorted to each other and lose the effect of arc extinguishing

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