CN2149684Y

CN2149684Y - Electromagnetic switch

Info

Publication number: CN2149684Y
Application number: CN 92218727
Authority: CN
Inventors: 徐文登
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-09-17
Filing date: 1992-09-17
Publication date: 1993-12-15
Anticipated expiration: 2002-09-17

Abstract

The utility model discloses an electromagnetic switch, which is the improvement of an existing electromagnetic switch which takes an electromagnetic large power relay as a core component. The lower part of a starting button has an ejector pin which is arranged at the upper part of a spring assembly with a movable iron core. A simple mechanism device is added between the starting button and the spring assembly with a movable iron core, mechanical external force and electromagnetic attracting force of a coil are made to simultaneously act on the spring assembly with a movable iron core for compelling movable contacts to be tightly closed with normally open static contacts; the shake and skip phenomenon existing in the existing electromagnetic switches is effectively overcome, the time of the starting process of loads is shortened, and the power consumption of electromagnetic coils is reduced. The utility model has the advantages of high reliability and long service life, and ensures the electromagnetic switch also exert actions when controlling loads with large power supply line resistance and large capacity of electric motors.

Description

Electromagnetic switch

The utility model be to existing be the improvement of the electromagnetic switch of core component with the electromagnetic high-power relay, belong to low-voltage electrical apparatus control field.

Existing is the electromagnetic switch of core component with the electromagnetic high-power relay, when starting inductive load or capacitive load, because of the starting current of load is bigger, if the resistance of circuit line is also bigger, the pulling relay coil electromagnetic force is descended, and moving iron core reed group just has the tendency that resets.Like this, in the load starting process, contact switches on and off the starting current of load with very high frequency, produces works of beating that quiver, and causes to continue arcing down to making contact melting welding.

The purpose of this utility model is to adopt a kind of simple and easy to do mechanical structure form, overcomes the existing jumping phenomenon of quivering of this type of electromagnetic switch, prolongs electromagnetic switch useful life and fail safe.

For achieving the above object, the utility model is improved on existing electromagnetic switch basis, promptly between starting button and moving iron core reed group, increase a simple mechanical device (as lever, push rod), and can remove on the starting button normally opened contact from order to closing coil adhesive loop, like this, the mechanical force that is had when pressing down starting button is by above-mentioned simple mechanical device, force moving iron core reed group to overcome the back-moving spring pulling force and move, make the movable contact on the iron core reed group and often open the break tight closure, connect load circuit and relay electromagnetic force and keep the loop.When the maintenance loop one of relay is switched on, the moving iron core reed group of the electromagnetic force moment adhesive that coil produces.Like this, in the load starting process, press down starting button and continue for some time the work of beating that quivers in the time of just effectively preventing the electromagnetic switch starting.Starting process finishes, and the starting mechanical external force disappears, and the starting current of load is converted into running current, and the voltage on the solenoid recovers, and the electromagnetic force that form this moment has been enough to the reliable attracting state of latching relay.As long as press stop botton when needing to shut down, cut off the current supply circuit of solenoid, coil electromagnetism power disappears, and moving iron core reed group resets.

Very simple and the work of beating that quivers when having overcome starting dexterously of the utility model, shortened the load starting process time, and reduced coil power consumption, improved reliability, enlarged also in addition that the resistance of electromagnetic switch starting supply lines is big, the ability of big and so on the load of capacity motor.

Introduce an embodiment of the present utility model below in conjunction with accompanying drawing.

Accompanying drawing 1 the utility model embodiment key position structural representation.

Present embodiment is improved on small-sized high-power support type electromagnetic relay JQX-22F basis.As shown in Figure 1, starting button (2) is arranged on moving iron core reed group (4) top, this starting button bottom is connected to a lengthening push rod (3), when pressing down starting button, push rod directly promotes moving iron core reed group, forces the movable contact (6) on the moving iron core reed group and often opens break (7) tight closure connection load circuit and relay maintenance loop.Keep loop one to be switched on, the electromagnetic force that coil (9) produces, iron core reed group is moved in the moment adhesive.Whole like this starting process is to finish at mechanical external force with under the acting in conjunction of the coil electromagnetism the suction-combining force that produces thereupon.Even in this process because starting current has caused droop loss, and electromagnetic force can descend, but starting external force also synchronously continuous action on movable contact, just can not allow movable contact to bounce based on the superposition of two kinds of power of this external force.After treating that load has overcome the normally moving commentaries on classics of starting reactance, unclamp starting button, and relay keeps the loop to continue to keep coil electromagnetism suction.Promptly cut off the maintenance ring current when pressing down stop botton, coil electromagnetism power disappears, and under back-moving spring (8) pulling force, moving iron core reed group resets movable contact and normally closed break (5) closure.Shell (1) plays insulation and fixation.

Claims

1, a kind of nothing jumping electromagnetic switch of quivering; it comprises electromagnetic relay, starting button, stop botton etc.; it is characterized in that; one push rod is arranged at the starting button bottom, and this push rod is arranged on the top of the moving iron core reed group of electromagnetic relay, is under the stopped status; between this push rod lower end and the moving iron core reed group slight gap is arranged; when starting button is pressed down, the direct roof pressure of this push rod moves iron core reed group, forces moving iron core reed group to move downward.