A Miniaturized Reclosing Circuit Breaker

Abstract

A small-scale reclosure breaker comprises a current transformer, an electric leakage transformer, an operation mechanism and an electric reclosure mechanism which are installed on a base. The electric reclosure mechanism comprises an integrated frame, a direct current motor installed on the integrated frame in a lateral surface fastening mode, a worm wheel, a worm meshed with the worm, a pinion coaxially and fixedly connected with the worm wheel, a big gear and a double-movement-pair slider-crank mechanism connected with a pull rod of an operation mechanism. The direct current motor is an execution mechanism of the electric reclosure mechanism, a rotary shaft of the direct current motor is connected with the worm, the pinion is meshed with the big gear and do circumferential motions under the driving of rotation of the direct current motor, the circumferential motions are converted into linear reciprocating motions of the pull rod of the operation mechanism through the double-movement-pair slider-crank mechanism, and re-trip, separation and closure motions of the reclosure breaker are realized. According to the small-scale reclosure breaker, the operation mechanism with the transversely arranged direct current micro motor is adopted and integrated with the breaker, so that the small-scale reclosure breaker can be highly integrated, small, exquisite, beautiful, safe and reliable.

Description

technical field [0001] The invention relates to the technical field of low-voltage intelligent circuit breaker manufacturing, in particular to a comprehensive residual current operated circuit breaker with functions of overload and short circuit protection, overvoltage and undervoltage protection, leakage protection, automatic reclosing and communication functions, especially a The safe and reliable automatic reclosing circuit breaker is suitable for the popularization of rural power grid transformation and the miniaturized reclosing circuit breaker required by the smart grid. Background technique [0002] With the development of low-voltage electrical appliances and the popularization of rural power grid transformation, the traditional residual current operated circuit breaker can no longer meet the requirements of the smart grid due to its single function. In order to improve the high continuity of power consumption and realize network management and remote monitoring, a A...

AI Technical Summary

Problems solved by technology

However, these existing automatic reclosing circuit breakers all use AC motors as actuators, which generally have the common shortcomings of complex structure and large volume, and the breaking capacity of the old generation products is not high. The existing electric operating mechanism is installed on the device, which makes the product larger in size, especially in terms of height, and has simple functions

The second type is an integrated circuit breaker that directly uses an AC motor as an actuator and is made through a simple connecting rod. In fact, such a circuit breaker is not suitable for specific phase failures such as circuit breakers used in three-phase four-wire workplaces. In this situation, the AC motor uses the power supply on the A phase and the N phase. When the A phase suddenly loses phase, the circuit breaker detects that the circuit is abnormal and needs to trip, but because there is no AC power supply, the circuit breaker cannot trip for protection. Therefore, its reliability and safety cannot be guaranteed

[0003] From the perspective of design structure, the existing products in the market mainly have the following three unreasonable structures. The first aspect is that the motor occupies most of the volume of the electric operating mechanism, which makes the motor and its installation structure unreasonable.

The second aspect is that the internal structure design of the electric operating mechanism is unreasonable, especially its transmission mechanism. into the direction of the output shaft of the applicable electric operating mechanism), conversion (to transform the rotation mode of the motor into a linear movement mode applicable to the electric operating mechanism), and to realize the three conversions of speed change, direction change, and transformation, relative Complex mechanism, the miniaturization design level of this mechanism determines the miniaturization degree of the electric operating mechanism, and the miniaturization degree of the specific structure of the existing electric operating mechanism is not ideal

The third aspect is that the overall layout structure of the electric operating mechanism is unreasonable, including the installation position and structure of the electric operating mechanism, the connection and linkage structure between the electric operating mechanism and the operating mechanism of the circuit breaker body, resulting in an uncompact structure of the circuit breaker and The problem of low integration

With the intelligent development of low-voltage electrical appliances and the popularization of rural power grid transformation, there is an urgent need to solve the problem of highly integrated electric operating mechanisms and circuit breakers for miniaturized low-voltage circuit breakers. , The problem of strong breaking ability

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