Method and device for regulating three-phase bimetallic strips to be synchronous during releasing under heat overload

Abstract

The invention discloses a method and device for regulating three-phase bimetallic strips to be synchronous during releasing under heat overload. The method comprises the following steps: a first shifter and a second shifter of a differentially shifting mechanism are inserted in parallel; the same side of each of drive arms of the first shifter forms a phase bimetallic strip acting area with one side of each adjacent drive arm of the second shifter; a synchronous governor is arranged in each phase bimetallic strip acting area, the first shifter and the second shifter are in releasing positions by regulating the differentially shifting mechanism, and the synchronous governors respectively fit with the drive arms at two sides of the phase bimetallic strip acting areas; and phase bimetallic strips are subjected to overload heat deformation, free ends of the phase bimetallic strips take position regulation along the synchronous governors, and the free ends of the phase bimetallic strips and the corresponding synchronous governors are fixed after positions between the free ends of the phase bimetallic strips and the corresponding synchronous governors. The device is simple to install and can absorb self-heating bend amount error caused by self characteristics of the bimetallic strips so as to realize more precise performance characteristic of release.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical appliances, in particular to a method and device for adjusting thermal overload tripping three-phase double-gold synchronization. Background technique [0002] The synchronicity of the bimetal strips (referred to as double gold) in the motor circuit breaker has a great influence on the action characteristics of the thermal motor circuit breaker, especially for the phase failure protection function. The three-phase bimetal strip and the shifter Inconsistencies in the distance will greatly reduce the performance of the motor circuit breaker, resulting in the thermal deformation of the bimetal strip acting on the shifter. The force acting on the shifter is not enough to push the trip mechanism to open the circuit, which in turn will burn the motor coil. [0003] In the current production, the more commonly used method is cold adjustment. In the non-working state of the double gold, dir...

AI Technical Summary

Problems solved by technology

[0005] When installing the above patent documents, it is necessary to measure the position data such as the distance between the end positions of each phase of the bimetal through a position measuring instrument in the cold state of the bimetal, and then press the adapter to the top protrusion of the corresponding bimetal to fix it. The longitudinal end of the adapter is adjacent to the corresponding arm part of the differential displacement mechanism with almost no gap. The installation procedure is complicated, and the position of the adjuster is fixed by an external clamp. The actual installation situation is fine-tuned; at the same time, because there is a certain error in the thermal bending amount of each bimetal sheet itself, the technology disclosed in the above patent documents can only absorb the initial installation position of the bimetal in the non-working state or the initial installation position of the bimetal. The phase spacing error caused by the installation error cannot really absorb the thermal bending error existing between the bimetal sheets in the working state

Images