Action mechanism of residual current operated circuit breaker

Abstract

The invention provides an action mechanism of a residual current operated circuit breaker. The action mechanism comprises a tripping coil fixed on a base of the circuit breaker, a lever pivotally arranged on the base, an indicating part, a reset spring for driving the lever to rotate towards a reset direction and an energy storage spring for driving the indicating part to linearly move outwards, wherein the indicating part is arranged on the base in a linear motion manner; the lever comprises a lever body capable of pivoting around a pivot, a first arm, a second arm and a third arm; the first arm, the second arm and the third arm stretch outwards from the lever body respectively; the first arm is pushed by the tripping coil to rotate the lever towards a tripping direction; the second arm directly drives a tripping shaft of the circuit breaker to move to trip the circuit breaker; and the third arm is matched with the indicating part, is used for limiting motion of the indicating part and locking the indicating part at a stable position when leakage tripping is not generated, and is used for accelerating rotation of the lever and releasing locking of the indicating part by the lever when leakage tripping is generated. The action mechanism of the residual current operated circuit breaker has the beneficial effects that the action mechanism is sensitive to act, fast in tripping and easy to manufacture and assemble.

Description

technical field [0001] The invention belongs to the field of low-voltage electrical appliances, and relates to a leakage protection module of a residual current operated circuit breaker, in particular to an operating mechanism of a residual current operated circuit breaker. Background technique [0002] The residual current operated circuit breaker is an essential device to ensure the safety of electricity consumption and switch circuits, and can protect electrical equipment and personal safety. In addition to the basic protection functions such as short circuit, the residual current operated circuit breaker also has the leakage protection function. When the leakage current reaches the rated value, the electromagnet coil is turned on to generate a magnetic field, which drives the iron core to move, thereby pushing the lock and unlocking the mechanism. , and at the same time drive the circuit breaker to trip through the lever and control the separation of the moving contact a...

AI Technical Summary

Problems solved by technology

[0003] The traditional action mechanism usually uses the trip mechanism as the transmission mechanism, that is, the trip coil (the above-mentioned electromagnetic coil) of the residual current first triggers the trip mechanism of the action mechanism to trip, and then the trip mechanism triggers the trip in the circuit breaker. The advantage is that the ideal tripping force can be obtained, but due to the complex structure and many transmission links involved in the tripping action, the tripping speed is slow, which affects the tripping sensitivity, and the production efficiency and manufacturing cost are not ideal.

Another existing action mechanism uses a tripping actuator as a transmission mechanism, that is, the tripping coil (above-mentioned electromagnetic coil) of the residual current first drives the tripping actuator to act, and the action of the tripping actuator then triggers the circuit breaker The action of the tripping part in the circuit has the advantage of simple structure, but the disadvantage is that the tripping force is small, because the tripping force factor has no other auxiliary external force except the electromagnetic force of the tripping coil.

There is also an actuating mechanism of an existing leakage protection module, which uses a rotatable trip actuator, a rectilinearly movable reset member, and a first elastic member (stage clip) that can drive the reset member to move upwards. The first matching part (protrusion part) on the trip actuator is inserted into the second matching part (through hole) on the second push rod on the trip actuator, so that the trip actuator remains stationary when there is no leakage, When there is an electric leakage, the trip actuator is driven to rotate by the traction part of the trip coil, and the rotation makes the protrusion of the first matching part slide out from the second matching part (through hole), and the sliding makes the reset part in the first elastic Under the action of the reset member (pressure spring), it moves upwards, and at the same time makes the accelerated tripping member (second rounded corner) on the reset member abut against the second push rod. Accelerate the tripping part (the second fillet) to push the second push rod and drive the tripping actuator to rotate rapidly in the tripping direction, but in fact this wish cannot be realized

Because: the upward movement of the reset part and the abutment determine that the direction in which the acceleration tripping part (the second rounded corner) pushes the second push rod and drives the tripping actuator to rotate is not the desired tripping direction, but is the direction opposite to the tripping direction, therefore, unless there are other undisclosed structures, the release energy of the first elastic member (pressure spring) of this mechanism is very important for improving the tripping actuation force, tripping speed or tripping sensitivity. incapable of producing any beneficial effect

In particular, it is unreliable that the tripping actuator of this existing action mechanism only depends on the structure in which the first matching part (protrusion) is inserted into the second matching part (through hole) to cooperate, because this cooperation cannot Realize the reliable positioning of the tripping actuator when there is no leakage, and when the circuit breaker is subjected to shocks such as vibrations, it will cause false tripping

In addition, the connection structure between the pulling part of the tripping coil and the tripping actuating part of this existing action mechanism is complex, requiring high machining accuracy for the pulling part and the tripping actuating part, making assembly and debugging difficult

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