Permanent magnet opening and closing type DC intelligent circuit breaker

Abstract

The invention discloses a permanent magnet opening and closing type DC intelligent circuit breaker, comprising a base arranged horizontally; the middle end of the base is provided with a moving contact, a moving contact supporting part and an input terminal electrically connected with the moving contact supporting part; the right end of the base is provided with a static contact, a static contactsupporting part and an outgoing busbar electrically connected with the static contact supporting part; arc quenching mechanisms are arranged above the moving contact and the static contact; the arc quenching mechanism comprises an arcing shield and an arcing ring; the left end of the base is provided with a permanent magnet type electromagnetic actuating mechanism and an insulating driving rod; the permanent magnet type electromagnetic actuating mechanism is provided with an actuating rod capable of straight reciprocating motion along the horizontal direction; one end of the insulating driving rod is fixedly connected with the tail end of the actuating rod and the other end thereof is connected with the moving contact supporting part in a rotary manner; while carrying out straight reciprocating motion, the actuating rod drives the moving contact supporting part and the moving contact to rotate in a reciprocating manner within a certain angle range through the insulating driving rod, thus realizing opening and closing operation. The circuit breaker has the advantages of simplified structure, fast breaking speed and stable and reliable performance.

Description

technical field [0001] The invention belongs to the technical field of DC switches, and in particular relates to a DC intelligent circuit breaker with short-circuit and overload protection functions. Background technique [0002] DC circuit breakers are mainly used in industrial and mining electric locomotives in my country to protect DC motors from short-circuit or overload. The existing DC fast circuit breakers generally use DC solenoid electromagnets to operate and drive. Although the structure is simpler than that of DC motors and fan motors, its operating current is larger and the size of the electromagnet is also larger. Therefore, It is necessary to increase the diameter of the wire and increase the size of the electromagnet, so that the volume of the entire circuit breaker becomes larger. Due to the self-overheating and impact force caused by the increase in the size of the electromagnet, it is difficult to meet the frequent operation requirements of the electric lo...

AI Technical Summary

Problems solved by technology

attached from its manual figure 1 It can be clearly observed that the structure of the linkage mechanism is very complicated, and there are many parts, which are prone to failure and difficult to operate reliably for a long time.

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