Contact mechanism of switching device capable of realizing three states

Abstract

The invention provides a contact mechanism of a switching device capable of realizing three states. The contact mechanism comprises multiple contact units sequentially arranged in parallel, wherein each contact unit comprises a movable contact group and a static contact group; mirror images on the two sides of the central part of the movable contact group symmetrically extend out of a movable contact plate part; each movable contact plate part further comprises a beat type contact and an arc-shaped knife type inserting contact which are fixedly arranged on the two sides of the external end part of the movable contact plate part respectively and have the same orientation; each static contact group comprises two finger-type beat type static contacts and one knife type inserting static contact, and the two finger-type beat type static contacts are arranged on the two sides of the central part of the movable contact group respectively. According to the invention, the contact mechanism can effectively reduce electrical wear generated when a contact is closed or disconnected, enables the rotating angle of the movable contact group to be enlarged to an angle nearly 180 degrees, is very suitable for the switching device capable of switching among three states, effectively avoids the point contact phenomenon caused by machining error and other cumulative errors, ensures contact pressure, and enables a movable contact and a static contact to keep excellent surface contact.

Description

technical field [0001] The invention belongs to the field of power conversion switch electric appliances. Background technique [0002] Power conversion switch electrical appliance is a widely used terminal electrical appliance. According to the control mode, it can be divided into three types: automatic type, manual type, and automatic / manual combined type. It mainly controls the action of the contact system through the operating mechanism to connect Or cut off the main power supply and backup power supply to ensure the safety of the power system and the continuity of production. [0003] The contact mechanism is a mechanism that is directly connected to the power supply in the transfer switch electrical appliance. The contacts in the contact mechanism are divided into two types: moving contacts and static contacts according to whether they move. There are two types of plug-in type and knife-type plug-in type. The finger-type clap-type contacts can resist burning under the...

AI Technical Summary

Problems solved by technology

However, the contact unit of this structure also has disadvantages: 1. There are two knife-type plug-in static contacts, and the structure is relatively complicated, which increases the cost and the possibility of failure; 2. Two knife-type contacts are arranged on both sides of the moving contact group Type plug-in static contact and two finger-type snap-in static contacts, and a spring and bracket should be set between the knife-type plug-in static contact and finger-type snap-in static contact. Therefore, the remaining space for the moving contact The effective rotation angle range is relatively limited, and can only reach a maximum angle range of 90 degrees. It is not suitable for switching appliances that require a double-open state in addition to the main close and standby close.

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