A kind of arc extinguishing chamber and its circuit breaker

Abstract

The invention discloses an arc-extinguishing chamber and a circuit breaker thereof, comprising a lower arc partition wall at the head end, a plurality of sets of lower arc partition walls at the middle end and the lower arc partition wall at the tail end. A plurality of heat-insulating rings are embedded, and a heat-absorbing ring is fixedly arranged in the inner ring of the heat-insulating ring; the end of the exhaust passage leading to the outside is gradually narrowed, and a unidirectional is fixed in the exhaust passage. The detachable arc quenching grid sheet and the fixed arc quenching grid sheet are both provided with arc striking grooves and arc striking gaps, and a gas generating plate is arranged below the thermosetting frame plate, and the gas generating plate is far away from the thermosetting frame. One side of the plate is not in contact with the thermally conductive plate. The invention provides an arc-extinguishing chamber, the number of arc-extinguishing grids can be freely assembled, the first grid that first contacts the arc is detachable, which is convenient for replacement after damage, and its own structure is more durable, effectively prolonging the life of the device. The invention also provides a circuit breaker including the above-mentioned arc extinguishing chamber, which is convenient to use and is very worth popularizing.

Description

technical field [0001] The invention relates to the technical field of electric power equipment, in particular to an arc extinguishing chamber and a circuit breaker thereof. Background technique [0002] In the prior art, a circuit breaker arc extinguishing chamber with the application number "201711466252.3" includes a fixed plate and several arc extinguishing grids. The fixed plate includes a bottom plate and two symmetrical side plates arranged at opposite ends of the bottom plate , there are several exhaust passages evenly distributed along the length direction of the bottom plate on the bottom plate, and several sets of fixing mechanisms are evenly distributed on the side plate along the length direction of the side plate, and the exhaust passages and the fixing mechanisms are sequentially staggered Set, the fixing mechanism includes several fixing holes evenly distributed along the width direction of the side plate, two opposite side ends of the arc extinguishing grid ...

AI Technical Summary

Problems solved by technology

[0003] However, there are still obvious defects in its use: 1. The current research shows that the more the number of arc extinguishing grids cut by arc cutting, the higher the arc voltage, the greater the energy of the arc that can be extinguished, and the performance of breaking and electrical life. The better, but an unlimited increase in the number of arc extinguishing grids will increase the cost, so it is best to flexibly select the number of arc extinguishing grids according to the actual situation, and the length of the side plate in the above device is fixed, so its extinguishing The number of arc grids is also constant, obviously its scope of application is limited and cannot be adjusted freely; 2. The arc is generated at the moment of opening, and the first arc extinguishing grid close to the static bus is the first to contact the arc and the contact time is long, burning The arc extinguishing grid is more serious than the other arc extinguishing grids, which is easy to cause burning and shorten the service life. However, the arc extinguishing grids in the above devices are uniform and fixed, and there is no additional protection design for the first arc extinguishing grid. , and it is difficult to replace the fragile first grid piece, which will easily lead to the failure and waste of the whole device; 3. The above-mentioned device lacks gas-generating materials and thermosetting materials, and cannot generate gas to accelerate arc movement and improve breaking performance. If a single The gas-generating material is placed in the arc extinguishing system, and its temperature resistance level cannot meet the actual requirements. When it is ablated by high temperature, it is easy to deform and affect the performance of the product.

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