Current regulating device of thermomagnetic release of circuit breaker

Abstract

The invention relates to a current regulating device of a thermomagnetic release of a circuit breaker, belonging to the technical field of an electric circuit breaker. The current regulating device comprises a bracket, a current regulating knob and a lock regulating knob, wherein the current regulating knob is rotatably arranged on the bracket, the upper end of the current regulating knob forms an operating end, the lower end of the current regulating knob forms a pushing end which is matched with an action claw of a releasing spring regulating rod of the thermomagnetic release, the lock regulating knob is rotatably arranged on the bracket and is matched with the operating end of the current regulating knob, and the operating end and the pushing end are together pivoted and arranged on the bracket. The invention ensures regulating precision and regulating reliability, thereby ensuring the accuracy of the instant tripping current of the circuit breaker.

Description

technical field [0001] The invention belongs to the technical field of electric circuit breakers, and in particular relates to a current regulating device for a thermomagnetic release of a circuit breaker. Background technique [0002] Figure 5 Shown is the current regulating device of the thermal magnetic release of the circuit breaker commonly used in the prior art, including a bracket 1 and a current regulating knob 2, the current regulating knob 2 is rotatably arranged on the bracket 1 in a cantilever state, Moreover, the upper end of the current adjusting knob 2 is formed as an operating end 21, and the operating end 21 protrudes from the surface of the bracket 1, while the lower end of the current adjusting knob 2 is formed as a pushing end 22, and the pushing end 22 is connected to the thermomagnetic detachment of the circuit breaker. The action pawl 31 of the trip spring adjusting rod 3 of the buckle cooperates. Depend on Figure 4 As shown, the bottom surface o...

AI Technical Summary

Problems solved by technology

Undoubtedly, no matter in terms of structure or convenience of adjustment, the current adjustment device of the above-mentioned thermomagnetic tripper does not have flaws that can be criticized. However, the adjustment accuracy of the current adjustment knob 2 is particularly It is a pity that the long-term retention of the adjusted position cannot meet the desired requirements.

Because the upper end of the current adjustment knob 2, that is, the operating end 21, is neither allowed to be too tight with the bracket 1 nor too loose with the bracket 1, if it is too tight, it is easy to operate (turn the current adjustment knob 2 to make it clockwise). or anti-clockwise rotation) causing trouble, specifically: the operation is difficult or even the operating end 21 of the current adjustment knob 2 is broken, because the operating end 21 is rotatably fitted on the bracket 1 by virtue of its neck 211, and the diameter of the neck 211 is larger than The diameter of the body of the current adjustment knob 2 is much smaller, and its ability to withstand torque is much weaker

On the contrary, if it is too loose, it is easy to cause inaccurate adjustment

However, in the actual manufacturing and assembly process, it is objectively impossible to find the best joint point between being neither too tight nor too loose; During use, not only will the initial set position be displaced due to factors such as vibration in the place of use, but also be deflected due to the force of the aforementioned instant release spring 321

Images