Stage-type load switch operation mechanism

Abstract

The invention discloses a stage-type load switch operation mechanism. The stage-type load switch operation mechanism comprises a front support plate, a rear support plate, an operation shaft, a two-sectional switch-on output crank arm, a switch-on trip limiting shaft, a switch-on trip interlock crank arm, an interlock rotating shaft, an interlock plate, a switch-on trip position plate, a switch-off trip rotating shaft, a switch-off energy storage position rotating shaft, a gear set, a mechanism driving rotating shaft, a switch-on spring and a switch-off spring. The switch-on stroke is divided into two stages, in a first stage, the switch-on spring does not store energy, and a mechanism output shaft rotates along an operating shaft of an operation mechanism; in the second stage, the switch-on spring stores energy in compression, the mechanism output shaft does not rotate until the energy storage mechanism trips away, the switch-on spring releases energy to drive the mechanism output shaft to rotate in acceleration so as to drive the load switch to switch on. The stage-type load switch operation mechanism has fewer parts and is simple to assemble; the output capability of the switch-on spring of the operation mechanism is optimized through the stage-type operation.

Description

technical field [0001] The invention relates to a load switch operating mechanism, in particular to a segmented load switch operating mechanism. Background technique [0002] The load switch is a switching device between the circuit breaker and the isolating switch. It has a simple arc extinguishing device, which can cut off the rated load current, but cannot cut off the short-circuit current. The load switch operating mechanism is a set of mechanical devices that drive the main shaft of the load switch to move through the energy storage and release of the spring to realize the closing and opening of the load switch. [0003] Among the currently popular types of load switches, some load switches often require a large stroke for closing and opening due to the arc extinguishing stroke, and usually the main shaft needs to rotate at a large angle. We know that when the load switch closes and opens, the spring needs to have enough output force to overcome the large contact react...

AI Technical Summary

Problems solved by technology

We know that when the load switch closes and opens, the spring needs to have enough output force to overcome the large contact reaction force or resistance when closing and opening. In order to increase the output force of the mechanism, one is to increase the spring diameter, and the other is to increase the spring diameter. The radius of the closing output crank arm (that is, increasing the length of the force arm), when the spring diameter cannot continue to increase due to the limitation of the mechanism, it can only be increased by increasing the radius of the mechanism closing output crank arm, but increasing the force arm means It will increase the working stroke of the spring. For example, if the radius of the crank arm A is 50mm and the radius of the crank arm B is 100mm, the difference between their spring working strokes is doubled.

That is to say, on the one hand, the crank arm B meets the requirements of the output force, but at the same time, it is found that the free spring length of the crank arm B is twice the free spring length of the crank arm A (because it needs to meet the working stroke of the spring), which is too long The length of the spring means that the overall size of the mechanism increases, which brings difficulties to the design

And on the other hand, the spring compression stroke increases, and the stored energy increases, which means that the input energy also increases. After the energy is released, the excess energy cannot make the switch closing performance better. After the angle changes and accelerates, the closing speed becomes larger, even exceeding the closing speed specified by the load switch, causing the contacts to wear or cause accidents due to high-speed impact

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