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A quick release for a current-limiting circuit breaker

A circuit breaker and release technology, which is applied in the field of quick releases for current-limiting circuit breakers, can solve the problems of circuit breaker overall size limitation, complex electromagnet structure, and low reliability, and achieve simple and reliable structure and high output force. Large, to avoid the effect of contact drop

Active Publication Date: 2022-04-15
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of the electromagnet is relatively complicated, the volume is difficult to be small enough, and the reliability is not high, which also limits the overall size of the circuit breaker with small frame level

Method used

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  • A quick release for a current-limiting circuit breaker
  • A quick release for a current-limiting circuit breaker
  • A quick release for a current-limiting circuit breaker

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0028] The purpose of the present invention is to overcome the existing problems of the existing release: (1) the speed is not fast enough due to the inductance characteristic of the electromagnet itself; (2) the structure is complex and the volume is large; (3) it is not resistant to impact. A fast release for a current-limiting circuit breaker is provided for the first time using a piezoelectric stack instead of a traditional electromagnet, which avoids the time required for the traditional electromagnet to establish a magnetic field, has the characteristics of fast response and large output force, and greatly improves Response speed, the circuit breaker mechanism can be tripped in time to avoid contact drop, thereby improving the current limiting level. The micro-displacement of the piezoelectric stack is directly amplified to a suitable multiple through t...

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Abstract

The invention discloses a quick release for a current-limiting circuit breaker, which includes a casing, a drive system, a lock, a pull rod, a lock shaft, a lock torsion spring, a pin shaft and screws, and the drive system is fixed inside the casing through screws. The pin shaft and the lock shaft are fixedly installed in the shell, the lock is installed on the lock shaft, the lock torsion spring is installed on the lock shaft and the pin shaft, and provides rotation force for the lock, and the pull rod is installed on the shell through the guide boss It is connected to the lock hinge through the pull rod boss on the pull rod. Driven by the lock, it can move in a straight line and drive the tripping shaft of the circuit breaker to realize opening. The patent of the invention adopts the piezoelectric stack as the power source, which has fast response, can realize tripping and opening in time, improves the current limiting level of the current-limiting circuit breaker, prevents the contacts from falling back and welding after being repelled, and enhances the breaking of the circuit breaker Capability; use the triangular amplification principle to directly amplify the micro-displacement of the piezoelectric stack to an appropriate multiple, without the need for an intermediate conversion mechanism, small size, and compact structure.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a quick release for a current-limiting circuit breaker. Background technique [0002] The current-limiting circuit breaker means that when the short-circuit current has not reached the maximum value, it can quickly cut off the short-circuit current to protect the safety of the entire system and subordinate electrical equipment. The current limiting level of the current-limiting circuit breaker directly determines the peak current that can be reached when the circuit is short-circuited, and then determines the ultimate breaking capacity of the circuit breaker and the protection ability of the power system. The higher the current limiting level, the stronger the protection ability of the circuit breaker for the system, and the stronger the breaking capacity of the circuit breaker itself. [0003] The working principle of the current-limiting circuit breaker is that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H71/12H01H71/02
CPCH01H71/127H01H71/02
Inventor 祝聪罗欣宇徐庭伟徐凯王华敏
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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