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Operating mechanism of circuit breaker

A technology of operating mechanism and circuit breaker, applied in the direction of protection switch operation/release mechanism, contact drive mechanism, etc., can solve the problems of limited mechanical life, large force on the locking lever, easy failure, etc., to improve the closing transmission ratio. , The effect of improving life expectancy and strength

Pending Publication Date: 2021-03-30
SHANGHAI LIANGXIN ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Operating mechanism of circuit breaker
  • Operating mechanism of circuit breaker
  • Operating mechanism of circuit breaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] The operating mechanism of a circuit breaker of the present invention will be described in detail below with reference to the accompanying drawings.

[0048] see figure 1 and figure 2 , an operating mechanism of a circuit breaker of the present invention includes a housing 14, a separable contact 15, a pair of side plates 1, a shaft assembly 2, a connecting rod assembly 3 arranged between a pair of side plates 1, an energy storage A lever assembly 4 , a lock assembly 5 , a spring assembly 6 , a camshaft 7 , a closing semi-shaft 8 , an opening semi-shaft 9 and a pair of opening springs 10 .

[0049] see image 3 , Figure 4 and Figure 5 A pair of side plates 1 are fixedly connected by a fixed shaft one 101, a fixed shaft two 102, a fixed shaft three 103, and a fixed shaft four 104, and a pair of fixed blocks 105 are respectively fixed on the inner side of a pair of side plates 1. A pair of side plates 1 are fixed on the housing 14, a pair of hoops 11 are fixed on ...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H71/10H01H3/46H01H3/42
CPCH01H3/42H01H3/46H01H71/10
Inventor 卢嘉玉轩吉涛何春赵鹏
Owner SHANGHAI LIANGXIN ELECTRICAL
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