Bipolar DC contactor

Abstract

The invention relates to a bipolar DC contactor which is widely used in the electricity, the metallurgy, the mine, the petroleum and the traffic transportation and other heavy load systems, especially in the main traction loop on an electric locomotive, comprising an insulating frame part, a transmission part, an electromagnetic driving part, a serial magnetic blow-out part, an arc extinction system and a subsidiary loop, wherein the insulating frame part includes a static contact wallboard, an incoming line bus bar insulating wallboard and a movable contact insulating wallboard; the transmission part comprises an armature, a movable contact insulating wallboard and a movable contact; the electromagnetic driving part includes a driving coil, an iron core and an armature; the serial magnetic blow-out part includes a magnetic blow-out iron core, a magnetic blow-out coil, a stainless steel electrode, a static contact arc leading angle and a static main contact; the air extinction system comprises an air extinction chamber and a ceramic grid; the subsidiary loop is provided with a module type quick-action switch. The invention has the advantages of long service life, rapid breaking speed, stable breaking arc voltage, self-clean contact, arc leading passage, compact structure, few safety misadventures and convenient installation and maintenance.

Description

Technical field [0001] The invention relates to a bipolar DC contactor, which is a large-capacity bipolar electromagnetic beat-on DC contactor, which is widely used in medium and heavy load systems such as electric power, metallurgy, mining, petroleum, transportation, etc., and is especially suitable for electric locomotives In the main traction circuit. Background technique [0002] At present, the DC contactors used on locomotives in my country are mainly electro-pneumatic and electromagnetic. Electromagnetic contactors rely on electromagnetic force as a power source. The electromagnetic direct-acting contactor mainly includes the body part, transmission part, electromagnetic drive part, magnetic blowing part and arc extinguishing device. When the electromagnetic system is energized, electromagnetic force is generated to move the armature and make the contacts turn on or off, thereby turning on or off the DC arc, and the electromagnet loses electricity and the contacts reset. ...

AI Technical Summary

Problems solved by technology

[0003] The disadvantages of the above-mentioned DC contactor are: 1. The contact capacity is small, and contact welding is prone to occur; 2. There is no relative friction between the moving contact and the static contact when they are closed and opened, and there is no self-cleaning function; 3. The arc extinguishing device is too simple, and the ability to elongate the arc and cool the arc is poor; 4. The series magnetic blower part adopts permanent magnet steel, and the use of the main circuit is divided into positive and negative poles. The contactor itself may be damaged if it is connected in the wrong direction. 5. The contacts cannot be replaced, and the electrical life is short; 6. The arc transfer layer is poor, and the electrical life is low; 7. Most of the arc extinguishing chambers use metal grid structure, resulting in unstable breaking arc voltage

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