Contact device and electromagnetic switch

Abstract

The invention provides an electromagnetic switch. The electromagnetic switch comprises a driving device and a contact device, wherein the contact device comprises a moving contact assembly, a base body and two static contacts arranged on the top of the base body in a spaced mode, the moving contact assembly comprises a push rod component, a moving contact, a fixed magnetizer and a movable magnetizer, one end of the push rod component is located in the base body, the other end of the push rod component is installed on the driving device, the moving contact is arranged on the push rod component, the fixed magnetizer is installed on the push rod component and is located on one side, close to the two static contacts, of the moving contact, at least one part of the movable magnetizer is arranged on one side, far away from the static contact, of the movable contact and can move along with the movable contact, when the moving contact is in contact with the two static contacts, the fixed magnetizer and the movable magnetizer are in a separated state to form a working air gap, and at least one magnetic conductive structure is arranged at the end portion of one side, facing the fixed magnetizer, of the movable magnetizer so as to reduce the air gap magnetic resistance of the working air gap and improve the electromagnetic attraction force, so that the short-circuit current resistance is improved.

Description

technical field [0001] The present application relates to the technical field of electrical control devices, in particular to a contact device and an electromagnetic switch. Background technique [0002] Electromagnetic switch refers to an electrical appliance that can frequently close, carry and break normal current and specified overload current. Its working principle is to use the coil to flow current to generate a magnetic field to make the contacts close or open to achieve the purpose of controlling the load. Electromagnetic switches usually include contactors and relays. [0003] With the rapid development of the new energy industry, the requirements for the ability of electromagnetic switches to resist fault short-circuit currents are also getting higher and higher. The electric repulsion force on the moving contact. The existing electromagnetic switch improves the anti-short-circuit capability of the contacts without increasing the contact pressure through the ant...

AI Technical Summary

Problems solved by technology

The existing electromagnetic switch improves the anti-short-circuit capability of the contacts without increasing the contact pressure through the anti-short-circuit current design, but the air-gap reluctance of the anti-short-circuit current design in the existing structure is large, resulting in the electromagnetic switch. The ability to resist short-circuit current is low, which often cannot meet the requirements

Images