Large open-distance dual-power automatic transfer switch

Abstract

A large open-distance dual-power automatic transfer switch comprises an electromagnet drive mechanism, a lever transmission mechanism and a contact arc extinguishing mechanism, wherein the lever transmission mechanism comprises a transmission lever and an action arm, a fulcrum shaft is arranged in the middle of the transmission lever, a force end is provided with a force point groove, a resistanceend is provided with a blocking shaft, the action arm is set to an L shape, one end of the action arm is provided with a waist hole, and the other end is vertically fixed with a movable contact shaft. The common power transmission lever and the backup power transmission lever are oppositely disposed in the installation base plate by the lever cover, and the end of the movable contact shaft of theaction arm is sleeved on the installation base plate, and the waist hole on the action arm is sleeved in the blocking shaft of the resistance end of the transmission lever. Due to the special structure of the lever transmission mechanism, the rotation shaft equipped with the movable contact can obtain a rotation angle of 36 degrees, so that the opening distance of a dynamic contact and a static contact of the dual-power supply reaches 23mm, which is beneficial to the arc extinguishing of the contact arc extinguishing mechanism of the dual power, and improves the breaking and arc extinguishingcapability and working stability of the dual power.

Description

[0001] The invention relates to a low-voltage electrical appliance, in particular to a double-power automatic transfer switch with a large opening distance. Background technique [0002] Dual power automatic transfer switch is a commonly used low-voltage electrical appliance. It is often used to switch between two power sources to ensure that when one power source fails or stops supplying power, the other power source can be quickly switched to ensure the normal power supply of the load circuit. Chinese patent document 2015108472749 discloses a contact arc extinguishing system for a dual-power automatic transfer switch. Since the contact systems of the normal power supply and the backup power supply are arranged oppositely, and share an N-type arc extinguishing box, its volume is greatly reduced, but the extinguishing The arc capacity is limited. Chinese patent document 2016100795722 discloses a link action mechanism of a dual power supply automatic transfer switch. Due to the ...

AI Technical Summary

Problems solved by technology

Chinese patent document 2015108472749 discloses a contact arc extinguishing system for a dual-power automatic transfer switch. Since the contact systems of the normal power supply and the backup power supply are arranged oppositely, and share an N-type arc extinguishing box, its volume is greatly reduced, but the extinguishing The arc capacity is limited. Chinese patent document 2016100795722 discloses a link action mechanism of a dual power supply automatic transfer switch. Due to the structural limitation of the link action mechanism, the maximum rotation angle of the movable contact shaft is 25 degrees, so that the dynamic and static contacts The opening distance between them is small, which limits the improvement of its arc extinguishing performance

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