an electromagnetic switch

Abstract

The invention discloses an electromagnetic switch, which comprises a shell, wherein a fixed contact I and a fixed contact II are accommodated into an upper position in the shell; a movable contact is arranged above the fixed contact I and the fixed contact II; a pressing stop is arranged on the upper wall of the movable contact; the fixed contact I and the fixed contact II are provided with a stopper I and a stopper II respectively; each stopper comprises a first convex hull and a second convex hull; each first convex hull is provided with a first curved surface capable of ensuring that the movable contact is just in contact with the fixed contact I or the fixed contact II after the surface of the end surface in the moving axial direction of a movable core is worn; and each second convex hull is provided with a second curved surface capable of ensuring a gap between the movable core and the fixed contact I or the fixed contact II after the surface of the end surface in the moving axial direction of the movable core is worn. The pressing stop is added to the movable contact and the stoppers are added to the fixed contacts, so that the short-circuit phenomenon due to the fact that the movable core is out of control in motion caused by abrasion of the surface of the end part in the axial direction is prevented and the usability of the electromagnetic switch is greatly improved.

Description

technical field [0001] The invention relates to the technical field of electronic equipment, in particular to an electromagnetic switch. Background technique [0002] An electromagnetic switching device is an electrical switching device used as a connection converter to switch on / off the main circuit according to a small change in input current. In an electromagnetic switchgear, a contact point is moved by electromagnetic force, thereby applying or breaking a current. The working principle of the electromagnetic switch is as follows: the excitation coil generates magnetic force to form a magnetic flux circuit and makes the fixed core have magnetic force, the movable core moves under the attraction of the fixed core with magnetic force, and the movable core drives the movable contact through the shaft to move and contact Or do not touch the fixed contacts, so as to realize the electrical connection and disconnection. Generally, the movable core moves along the axial directi...

AI Technical Summary

Problems solved by technology

Generally, the movable core moves along the axial direction, so the long-term reciprocating movement of the movable core will cause wear on the surface of the axial end, which will directly affect the movement of the movable core, and there may be movable contacts and fixed contacts. The large contact force makes the contacts more easily damaged, and the movable core may abut against the lower wall of the fixed contact to cause a short circuit, and it will become more serious with the wear of the end surface in the axial direction, which greatly reduces the electromagnetic switch. performance

Images