Operating mechanism of automatically jumping small circuit breaker

Abstract

The invention relates to an operating mechanism of a small-sized breaker being capable of freely releasing. The mechanism of the invention mainly adopts the structure that a handle, a lever, a moving contact, a locking component, a main shaft and a jump component are arranged in a shell. The mechanism of the invention is characterized in that the moving contact is articulated with the lever and the locking component through the main shaft; the moving contact is articulated with the lever and the locking component through the main shaft; one end of the contact pressure spring is connected with the moving contact, and the other end is connected with the lever; one end of the locking spring is connected with the locking component, and the other end is connected with the lever; one end of an energy storage spring is connected with the lever, and the other end is connected with a shaft that is fixed with the shell. The mechanism of the invention has simple, compact and reasonable structure, leads to more stable contact pressure between the moving contact and the static contact, only requires general process accuracy, reduces cost and is a small-sized operating device of a breaker which can freely release with more reasonable layout of the contact pressure spring and the energy storage spring.

Description

technical field [0001] The invention relates to an operating mechanism of a small circuit breaker with a free tripping mechanism, in particular to an operating mechanism of a small circuit breaker with a free tripping mechanism. The locking position between the locking members can be released to disengage the mechanism. Background technique [0002] At present, miniature circuit breakers are mainly used to replace fuse protection devices. The miniature circuit breaker is a type of switch with switch lock, magnetic trip protection and thermal trip protection; when a short-circuit current occurs, the magnetic trip protection action mechanism moves quickly under the action of a strong electromagnetic force to release the switch lock instantaneously , the switch is turned off, and the line current is cut off; when the line is heated, the bimetallic thermal release unlocks the switch lock, the switch is turned off, and the line current is cut off. [0003] In the prior art, suc...

AI Technical Summary

Problems solved by technology

In addition, the energy storage of contact pressure and contact disconnection is completed by a tension spring, and it is difficult to optimize the two at the same time; the movement trend at the moving contact is larger than the movement of the mechanism, which makes the contact pressure error between the moving and static contacts change. , resulting in the instability of the contact pressure; therefore, it is necessary to ensure high manufacturing accuracy of the parts

This patented product sold on the market also reflects its own design deficiencies. For example, in the realized high-current products, silver blocks are even used in moving contacts to reduce contact resistance and compensate contact pressure (larger contact pressure can be obtained) Lower contact resistance), which will inevitably increase the cost, but also increase the difficulty of product realization

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