Minitype breaker with high stability

Abstract

The invention relates to a minitype breaker with high stability, which comprises an operating mechanism; the operating mechanism comprises a pivotal shaft fixed on a shell; the pivotal shaft comprises a first shaft section, a second shaft section and a shaft shoulder; the diameter of the second shaft section is larger than that of the first shaft section; and the diameter of the shaft shoulder is larger than that of the second shaft section. A lever is installed on the first shaft section through a first shaft hole in a pivoting way and used for limiting the axial position of a boss table relative to the pivotal shaft through contact coordination between the boss table arranged on the lever and a thrust table arranged on the second shaft section. A buckle is installed on the second shaft section through a second shaft hole in a pivoting way; a first end face matched with a support surface on the shaft shoulder is arranged at one end of the second shaft hole; and a second end face matched with the boss table is arranged at the other end of the second shaft hole. A first hasp matched with a second hasp arranged on the buckle is arranged on a connecting rod, the connecting rod is meshed with the buckle when the first and second hasps are contacted and buckled with each other, and the buckle controls a drive rod and the lever not to move relatively; and the connecting rod is separated from the buckle when the first and second hasps are separated and unbuckled, the buckle is separated from the drive rod to lead the drive rod to slide along a groove in the lever.

Description

technical field [0001] The invention relates to a low-voltage circuit breaker in the field of power distribution, in particular to a small circuit breaker with high stability, which includes a lock device for stabilizing the operating performance of the small circuit breaker and an arc extinguishing chamber matched with the lock. Background technique [0002] Existing miniature circuit breakers (hereinafter referred to as circuit breakers) have been widely used as line protection components, and the quantity of mass production is increasing, and the application fields are becoming wider and wider. higher requirements. Starting from the most basic working requirements of a circuit breaker, the working performance of a circuit breaker includes operating characteristics, operating characteristics and breaking characteristics, and the basis for measuring the stability of a circuit breaker is mainly related to time. The time characteristic is stable in time, the operating charac...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a high-stability miniature circuit breaker that overcomes the above-mentioned defects of the prior art. The lever and the lock are installed coaxially, and the lock can rotate around the pivot axis and at the same time it can also rotate along the axis of the pivot axis. The scheme of moderate swing solves the problem of poor stability of the circuit breaker caused by the change of the tripping force of the operating mechanism

And by adding a wedge-shaped interlocking pin to improve the connection structure between the lever and the lock, the problem of poor stability of the circuit breaker caused by the change of the impact force of the release is solved

Furthermore, by adding insulating ribs to improve the structure of the arc extinguishing chamber, the problem of poor stability of the circuit breaker caused by the damage of the interrupting air flow to the arc extinguishing chamber was solved

Furthermore, by improving the structure of the return spring, the problem of poor stability of the circuit breaker caused by the elastic force change of the return spring is solved

The high-stability miniature circuit breaker of the present invention not only solves the problem of poor stability of the circuit breaker by taking measures from multiple angles for different causes, but also has the characteristics of simple structure and good operability

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