Arc quenching system for nonpolar direct current contactor

Abstract

The invention discloses an arc quenching system for a nonpolar direct current contactor. The system comprises a moving contact, fixed contacts, a first permanent magnet, a second permanent magnet and a third permanent magnet, wherein the second permanent magnet is arranged between a first contact and a second contact; the first permanent magnet is arranged outside the first contact; the third permanent magnet is arranged outside the second contact; the first permanent magnet, the first contact, a third contact, the second permanent magnet, the second contact, a fourth contact and the third permanent magnet are spatially arranged at intervals; and the adjacent magnetic poles of the first permanent magnet, the second permanent magnet and the third permanent magnet have opposite polarity. The system has the following beneficial effects: when the magnetic fields formed by the first permanent magnet and the second permanent magnet pull the arc generated between the first contact and the third contact to one side, the magnetic fields formed by the third permanent magnet and the second permanent magnet pull the arc generated between the second contact and the fourth contact of the movingcontact to the opposite side, thus ensuring the spraying directions of the arcs generated by the two groups of contacts to be completely opposite.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to an arc extinguishing system for a non-polar DC contactor. Background technique [0002] The arc extinguishing methods of DC contactors include natural arc extinguishing, metal grid arc extinguishing, vacuum arc extinguishing, pressure gas arc extinguishing, self-magnetic blowing combined with metal grid arc extinguishing, permanent magnet blowing arc extinguishing, pressure gas combined with permanent magnet Blow out the arc and so on. [0003] However, the above-mentioned arc extinguishing methods have their own characteristics and can only be applied to some occasions. For example, natural arc extinguishing, metal grid arc extinguishing, and vacuum arc extinguishing can adapt to a low DC voltage value and a large volume. The volume of the self-magnetic blower combined with the arc extinguishing of the metal grid is large and the cost is very high. Although pe...

AI Technical Summary

Problems solved by technology

Although permanent magnet arc extinguishing and pressure gas arc extinguishing have improved the breaking voltage compared with natural arc extinguishing and vacuum arc extinguishing, they are not high enough

Pressurized gas combined with permanent magnet arc extinguishing achieves small size and high breaking voltage, but it has the only shortcoming of current direction, which cannot achieve the function of alternating forward and reverse currents on the same contactor

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