A circuit breaker with a new type of arc extinguishing chamber

Abstract

The invention discloses a circuit breaker with a new type of arc extinguishing chamber, which comprises an arc extinguishing chamber, a static contact conducting plate with a static contact embedded in the arc extinguishing chamber, and a fixed contact plate embedded in the arc extinguishing chamber that can be connected with the arc extinguishing chamber. The static contact is connected or disconnected by the moving contact; the conductive plate of the static contact is also provided with a yoke, and an open receiving groove is formed on the yoke, and the moving contact is located on the Inside the receiving groove of the yoke. In the present invention, a magnetic yoke is provided on the conductive plate of the static contact, and when a short circuit occurs in the circuit, the magnetic yoke will generate a magnetic field, increase the strength of the magnetic blow, and accelerate the extinguishment of the arc; and in the present invention, the moving contact Located in the accommodating groove of the yoke, the magnetic field generated in this way will contact the arc to the maximum extent, so that the arc can be extinguished quickly.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a circuit breaker with a novel arc extinguishing chamber. Background technique [0002] The short-circuit protection of circuit breakers is an important function of various electrical appliances, and it is also an important symbol to measure the performance of circuit breakers. The arc extinguishing system is an important part of the circuit breaker to ensure the breaking capacity. The traditional arc extinguishing system is mainly composed of arc extinguishing chamber and contact parts. Composition, in which a number of arc extinguishing grids and insulating supports of the arc extinguishing chamber are assembled and riveted; however, due to the limitation of the space of the circuit breaker itself, the number of arc extinguishing grids is limited, so the arc extinguishing chamber of the traditional molded case circuit breaker Arc ability is limited. [0003] For this reason, Chinese patent...

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Problems solved by technology

[0004] However, the arc extinguishing chamber of the circuit breaker described in the above-mentioned patent documents has the following disadvantages: in the arc extinguishing chamber of the circuit breaker, the extinguishing of the arc is accelerated by the gas pressure generated after the plate is vaporized, but the arc extinguishing chamber of the arc extinguishing chamber The splicing structure of the arc grid, the arc extinguishing grid installation plate and the plug-in board makes the gas generated after the plug-in board gasified cannot accumulate, that is to say, the generated gas is prone to multi-directional diffusion, and the gas pressure is relatively low. Small, so that the arc extinguishing ability of the arc extinguishing chamber cannot be greatly improved, that is, although the arc extinguishing chamber with this structure has improved compared with the previous one, its arc extinguishing ability is still limited

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