A contactor for connecting capacitive elements

Abstract

The invention relates to a contactor connected with a capacitive element, which comprises a main contact group, an arc quenching chamber, a pushing mechanism, resistors, a pre-charging contact group and an electromagnetic mechanism, wherein the main contact group comprises a main moving contact and a main static contact; the pre-charging contact group comprises a pre-charging moving contact and a pre-charging static contact; the pre-charging contact group is serially connected with the resistor and then parallelly connected with the main contact group; after the electromagnetic mechanism is power-on, the pushing mechanism pushes the main moving contact to move towards the main static contact, and at the same time, the pushing mechanism pushes the pre-charging moving contact to move towards the pre-charging static contact; and the distance between the main moving contact and the main static contact is larger than the distance between the pre-charging moving contact and the pre-charging static contact. The contactor designed by the invention has a compact and reasonable structure and a small size, and can meet development requirements of a charging pile and a novel high-power electric vehicle.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a contactor for connecting capacitive elements. Background technique [0002] The existing unipolar DC contactor is mainly used for the start, stop and power conversion circuit control of electric vehicles, electric forklifts and storage battery vehicles. Traditional DC contactors mainly include operating mechanisms such as bases, contacts that control switching on and off circuits, and electromagnets, and most of their structures use former Soviet MZJ series aviation contactors or their improved models. For example, the Chinese patent number is The DC contactors disclosed in 200420037061.7, 200520089587.4, 20072015712.5, 200720105713.X and 200720045041.8 etc. In these existing unipolar DC contactors, permanent magnets are generally arranged on both sides of the contacts so that the arc is quickly blown away from the contacts, but the operating voltage of such DC...

AI Technical Summary

Problems solved by technology

Although this kind of DC contactor has high working reliability and good arc extinguishing performance, it still has the disadvantage of large size. Although it has been widely used in electric buses and trams, it cannot meet the increasing requirements of electric vehicles for miniaturization of on-board electrical appliances. requirements

[0004] In recent years, the DC contactors that have been used in electric vehicles and electric-vehicle hybrid vehicles on the market include air arc-extinguishing electromagnetic unipolar DC contactors with patent No. 201110003944.0 and LEV series hydrogen-nitrogen arc-extinguishing unipolar DC contactors. Although both products can meet the requirements of 320V battery operation, since the electromagnetic mechanism adopts the structure of a barrel-shaped yoke and a flat-shaped magnetically conductive flat piston, the surroundings of the flat-shaped magnetically-conducted flat plate and the surrounding of the barrel-shaped yoke With a small gap, the magnetic circuit formed with the central iron core, magnetic sleeve, and armature undoubtedly has a large magnetic flux leakage, and the suction force cannot support the installation of pre-charging contacts and auxiliary contacts. None of the existing technologies provide pre-charging contacts. The DC inflatable contactor of the head and auxiliary contacts cannot meet the requirements of further development and performance improvement of charging piles and electric vehicles

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