Multipole direct-current contactor

Abstract

The invention relates to a multipole direct-current contactor which solves the problems of overlarge volume, overmuch electric energy consumption of an electromagnetic coil and the like in the prior art. The multipole direct-current contactor comprises an electromagnetic mechanism, an arc extinguishing chamber and a contact system. The multipole direct-current contactor has the technical points that the electromagnetic mechanism is also provided with a power assisting device which is fixed on a bottom board and mainly consists of a power assisting magnetic block, a copper screw, a magnetism insulating pad, a guide rod, a spring and a guiding seat; magnetic permeating boards or thick magnetic permeating boards are inserted in two side walls of a contact chamber of the arc extinguishing chamber corresponding to electric arc generating positions, a permanent magnet is arranged between the two magnetic permeating boards, wherein the periphery of the permanent magnet is covered by a heat insulating sleeve, so that both ends of the permanent magnet are respectively in seamless adsorption connection with the magnetic permeating boards; and bridge type contacts are fixed on contact supports which support by using contact springs and reaction springs. The multipole direct-current contactor has the advantages of reasonable design, compact structure and small size as well as stable running and safe and reliable contact when the contacts are separated or contacted, and the rated working voltage of the direct-current contactor is obviously improved to a kilovolt level, thereby meeting the requirement on improving the rated working voltages of electric motor coaches for public traffic.

Description

technical field

[0001] The invention relates to a switch contactor for a low-voltage electrical appliance, in particular to a multi-pole DC contactor using an arc extinguishing device with a built-in permanent magnet magnetic blowing arc extinguishing structure. It is mainly used in places where the rated working voltage reaches kilovolts, such as electric buses for public transportation, solar energy, and wind energy. Background technique

[0002] Existing DC contactors are widely used in electric drive. There are many varieties, but most of them are two normally open contacts. to the conversion circuit control. Generally, the single-pole (1P) interrupter has one contact room, while the two-pole (2P) has two contact rooms, and the four-pole (4P) has four contact rooms. The same contact room is composed of these contact rooms. The interrupter is collectively referred to as the multi-pole interrupter. The traditional DC contactor mainly includes a contact system with a sin...

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