Sectional type load switch mechanism

Abstract

The invention discloses a sectional type load switch mechanism. In the mechanism, an output shaft is provided with a first-stage limiting pin and a second-stage limiting pin, the segment motion mode of a main shaft is realized through cooperating with a switching-on interlocking device, a switching-on limiting device and a unidirectional limiting block disposed on the switching-on limiting device, and an elbow type power-assisted switching-on output connecting lever is utilized to enable the main shaft to provide a larger output force in a final switching-on process when a force is more needed in case of a closer switching-on finishing position; at the same time, when switching-on is put in place, the elbow type output connecting lever is distributed in the form of a horizontal connecting rod, and self-locking is formed; and a driving sector plate on one hand provides a release signal for two-stage motion of the output shaft, and on the other hand performs energy storage on a switching-off spring and enables the switching-off spring to maintain at a main shaft switching-on state through a connection plate, a switching-off interlocking plate, a switching-off limiting pin and a switching-off limiting device. The operation mechanism, through dividing a switching-on process into two segments to respectively cooperate with different motion requirements of an isolation knife and a vacuum bubble, reduces the working stroke of the spring, improves energy utilization rate, and saves cost.

Description

technical field [0001] The invention relates to a switch electrical appliance used in a switch cabinet, in particular to a load switch. 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 output 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] In the current popular load switch cabinets, the environment-friendly load switch cabinet is the direction of development, and in today's environment-friendly load switch cabinets (without SF6), most of them use vacuum bubble switches, and vacuum arc extinguishing replaces the previous ones. Sulfur hexafluoride gas arc extinguishing, although the opening dist...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the existing environment-friendly load switchgear that uses vacuum arc extinguishing instead of sulfur hexafluoride, a large amount of work is wasted on the isolation stroke that does not require closing and opening speed requirements and has a large distance, and at the same time causes the closing speed to be too fast, making it easier to touch Head wear and increased bouncing, or adding an isolation knife mechanism, increases the cost. The present invention is to provide a segmented load switch operating mechanism. The operating mechanism divides the closing process into two sections to cooperate with isolation The different action requirements of the knife and the vacuum bubble reduce the working stroke of the spring, increase the energy utilization rate, and save costs; in addition, adding an elbow-shaped power-assisted closing output arm can make the load switch obtain a more optimized output force of the mechanism

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