Electromagnetic relay capable of resisting short-circuit current

Abstract

The invention discloses an anti-short-circuit current electromagnetic relay. The relay comprises a base, a magnetic circuit part, a static spring part and a movable spring part, wherein the static spring part comprises a static spring leading-out sheet and an elastic static spring sheet, the static spring leading-out sheet is arranged on the base, a static contact is arranged on the static springsheet, and the static spring sheet is connected with the static spring leading-out sheet; and the static reed generates partial electrodynamic force towards the movable reed in a power-on state, and the electrodynamic force can resist electrodynamic repulsive force borne by the static contact. Due to the design of the static spring part, the capacity of a short-circuit resistant circuit can be improved, the static contact and the movable contact are reliably contacted, the bounce of the contacts is reduced, contact stability of the contacts is improved, an additional transmission structure does not need to be added, parts are reduced, structural complexity is reduced, and meanwhile, the product size is reduced to a certain extent.

Description

technical field [0001] The invention relates to the technical field of relays, in particular to an electromagnetic relay against short-circuit current. Background technique [0002] Short circuit (Short circuit) refers to the situation when two points with different potentials in a normal circuit are incorrectly directly touched or connected by a conductor with very small impedance (or resistance). The current intensity is very high during a short circuit, which tends to damage electrical equipment or cause a fire. The current switched on in this case is the short-circuit current. When the relay works normally in the circuit, when the short-circuit current passes through, the electrodynamic repulsion formed by the short-circuit current will have an impact on the contact parts of the relay, which may cause contact bonding or abnormal disconnection failure in severe cases. The ability of the relay to resist a certain short-circuit current without damage is called the short-c...

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Problems solved by technology

[0003] When the traditional electromagnetic relay passes the short-circuit current, the contacts are repelled under the action of electric repulsion, resulting in contact open circuit or contact bonding failure, and the ability to withstand short-circuit current is low

For this reason, the electromagnetic relay with anti-short-circuit current function has appeared in the prior art, but the structure of this electromagnetic relay for anti-short-circuit current is mostly arranged on the moving spring part, and additional transmission parts (such as pushing cards) need to be added, etc., this It not only increases the cost and the difficulty of structural assembly, but also is not suitable for electromagnetic relays with a relatively compact structure and a relatively small volume

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