Operating mechanism of circuit breaker

Abstract

The invention provides an operating mechanism of a circuit breaker, and the operating mechanism comprises a pair of side plates, a rotating shaft assembly, a connecting rod assembly arranged between the pair of side plates, an energy storage lever assembly, a lock catch assembly, a spring assembly, a cam shaft, a switching-on half shaft, a switching-off half shaft and a pair of return springs, wherein the rotating shaft assembly comprises a rotating shaft and a cantilever fixed on the rotating shaft; the two ends of the rotating shaft are rotatably connected with the pair of side plates correspondingly, so the rotating shaft assembly rotates on the pair of side plates. According to the invention, the reliability of the circuit breaker operating mechanism is realized, and the service life of the product is prolonged.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to an operating mechanism of a circuit breaker. Background technique [0002] In the electrical and electrical industry, as a power distribution device, the circuit breaker is responsible for protecting the electrical equipment in the power grid. That is, when a fault occurs in the power grid, such as a short-circuit current or a fault current, the circuit breaker breaks the current to protect the power grid. electrical equipment and personnel safety. In order to realize the above protection function, there is an operating mechanism inside the circuit breaker, which can control the internal zero of the operating mechanism. [0003] The movement of components separates the dynamic and static contacts of the circuit breaker, thereby cutting off the circuit. [0004] With the improvement of the performance index of the circuit breaker, the requirements for the operati...

AI Technical Summary

Problems solved by technology

Due to the discharge position of the energy storage spring and the impact position of the energy storage lever assembly and the connecting rod assembly of the existing mechanism, its closing transmission ratio is low, which limits the upper limit of its mechanical life improvement;

[0006] 2. The fulcrum shaft of the conversion lever and the camshaft are the same shaft, which leads to complex stress on the shaft, which needs to bear the force under alternating loads, and the shaft is prone to failure

At the same time, when the brake is closed, the reaction force of the contact is transmitted to the fulcrum shaft of the conversion lever (coaxial with the camshaft) through the connecting rod assembly. Compared with the energy storage of the opening, the camshaft bears more reaction force transmitted by the contact system. , so the closing energy storage moment is larger than the opening energy storage moment, which increases the burden of manual energy storage and electric energy storage;

[0007] 3. The switching lever span of the opening and tripping system is too long, the rigidity is low, and it is easy to fail after fatigue stress

Because the conversion lever and the camshaft share the same shaft in the prior art, it is necessary to ensure that the connecting rod does not interfere with the energy storage lever assembly and the camshaft when moving, so the structural design is destined to have a long span of the conversion lever and low rigidity, and It cannot be optimized in the original structure space;

[0008] 4. The lock lever of the closing and tripping system is prone to failure after fatigue stress

Because the closing and tripping system adopts a three-stage connecting rod structure in the process of energy storage and closing, the locking lever has only one fulcrum shaft, and the locking lever, fulcrum shaft and related parts are subject to excessive force and are easily damaged

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