Electromagnetic relay resistant to electric repulsive force

Abstract

The invention discloses an electromagnetic relay which resists electric repulsion force. When a relay contact is closed and the electromagnetic relay works, the relay is loaded, and a coil is provided with a setting signal. The current direction of a second leading-out sheet is opposite to the current direction of a movable spring, thus producing a magnetic field through the interaction. The magnetic field enables the movable spring to produce electromagnetic force. The produced electromagnetic force is in the same direction as the pushing force produced by a pushing card, thus increasing the contact pressure of a contact which is enough to resist the destruction of the electric repulsion force. The invention completely eliminates the technical problem that the electric repulsion force causes the contact to return easily in prior art. The invention further has the advantages of large resultant force of the electromagnetic force and the pushing force, small contact pressure of the contact, small contact resistance, reliable and stable electrical contact of the contact, capability of resisting short-circuit current, preventing the functional relay from being damaged, large switching power of the contact, capability of working under large load for long term, compact conformation, shock resistance, high impact capability, high capability of carrying load, low price, high manufacturability. In addition, the switching frequency of the invention shall not be too high, and the invention is applicable for streamlined production in large quantity.

Description

technical field [0001] The invention relates to an electromagnetic relay, in particular to an electromagnetic relay resisting electrodynamic repulsion. Background technique [0002] As an electromechanical component, electromagnetic relays are widely used in power control, industrial automation devices and household appliances. The existing magnetic latching relay generally includes a contact system, an electromagnetic system, a push card, a fixing frame, a base and a casing. The development trend of electromagnetic relays is low power consumption, miniaturization and large load, and permanent magnets are used in existing electromagnetic systems. The working principle of the relay with permanent magnet steel is: the open and closed state of the contact is usually maintained by the magnetic force generated by the permanent magnet steel. , The anti-DC pulse signal excites the coil, and the relay completes the state transition between open and closed in an instant, and then t...

AI Technical Summary

Problems solved by technology

The electrodynamic repulsion formed by the short-circuit current is always in the opposite direction of the contact closure, and the force that promotes the contact closure is only the force of the adjustment of the electromagnetic system, which is not enough to resist the electrodynamic repulsion, and the contacts are easy to bounce back and generate a strong arc. , the contacts are melted and burned due to the instantaneous high temperature, so the electric repulsion has a great destructive effect

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