Breaker with novel arc extinguishing chamber

Abstract

The invention discloses a breaker with a novel arc extinguishing chamber. The breaker with the novel arc extinguishing chamber comprises the arc extinguishing chamber, a static contact current-conducting plate provided with a static contact embedded in the arc extinguishing chamber, and a movable contact embedded in the arc extinguishing chamber and capable of being connected or disconnected with the static contact; the static contact current-conducting plate is further provided with a magnet yoke, the magnet yoke is formed with an open holding groove, and the movable contact is located in the holding groove of the magnet yoke. According to the breaker with the novel arc extinguishing chamber, the static contact current-conducting plate is provided with the magnet yoke, when there is a short in the circuit, the magnet yoke would generate a magnetic field to increase the magnetic blowout intensity and accelerate the electric arc extinguishing. The movable contact is located in the holding groove of the magnet yoke, and therefore, the magnetic field would be in contact with an electric arc in the largest area, and the electric 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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