Contact support structure for air circuit breaker contact system

Abstract

A contact support structure for an air circuit breaker contact system is disclosed. The contact support structure comprises a contact support body and a moving insulating partition assembly, wherein the moving insulating partition assembly and moving contact blades are arranged at intervals; two spaced moving contact blades form adjacent contact blades; the adjacent contact blades are connected with soft linkage parts; the moving insulating partition assembly and the adjacent moving blades are connected in series through a middle rotation supporting shaft and an upper rotation supporting shaft; the middle rotation supporting shaft is fixedly connected with two fixed board holes; fixed boards are fixed on the contact support body; the fixed boards and a U-shaped contact cover I are fixed in a clamping manner; a U-shaped contact cover II is fixed by the two ends of the middle rotation support shaft; the middle rotation support shaft is embedded in U-shaped grooves in the two side walls of the contact support body. Due to the contact support structure, the current-carrying on-off capacity of the circuit breaker is effectively improved, temperature rise is lowered, and the number of circuits of the contact system is increased; and meanwhile, the contact support structure has the characteristics of simple structure, convenient manufacturing and low cost.

Description

technical field [0001] The invention relates to a chip-type assembled contact group system, which belongs to the technical field of low-voltage power distribution appliances, and in particular to a contact support structure of a universal circuit breaker contact system. Background technique [0002] Universal low-voltage circuit breaker is mainly used in low-voltage power distribution system. It is mainly installed under the isolating switch connected by dry-type transformer as the main switch. It can connect and break the distribution line under rated load. In the case of a fault ( Such as overload and short circuit) automatically disconnect the circuit, and rely on the separation of dynamic and static contacts to achieve load and power isolation. Its protection feature has a short time delay function, that is, when a short circuit occurs in the line, the circuit breaker will not be repelled by the electric repulsion during the time interval when the lower circuit breaker d...

AI Technical Summary

Problems solved by technology

[0004] 1. The contact support is generally provided with multiple partitions (isolation grid sheets) on the body, and only 10 circuits can be set. This kind of contact support structure has a low space utilization rate, which makes the number of contact system circuits small, which is not conducive to lowering the temperature. Lift

[0005] 2. If thermosetting plastics with high temperature resistance, arc resistance, and high structural strength are used to manufacture isolation grid sheets, subject to the limitations of thermosetting plastic molding process conditions, its thickness cannot be made very thin (general requirements ≥ 1.2mm). Realizing the contact support of the above structure is limited by the processing technology of DMC pressing plastic

This technology still does not solve the problem of Chinese patent 201010223553.5. The soft joints are bent and intertwined together, and it is easy to cause the problem that once the contact piece of one circuit is burned, the multiple contact pieces will be burned at the same time.

At the same time, the size and shape of the insulating clip and the contact piece are the same. When the contact system is in operation, the asynchrony of the multi-piece contacts, the insulating clip and the contact piece are likely to cause misalignment during operation and rotation, and the continuous contact piece will transfer heat to Insulation clip, the softened insulation clip sticks to the spring when it is misplaced, causing the contact system to be stuck and the breaking operation cannot be performed

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