A DC relay capable of resisting short-circuit current and arc extinguishing

By adopting a combination structure of fixed upper yoke, follow-up upper yoke and lower armature in the DC relay, a magnetic ring is formed to enhance electromagnetic suction and a magnetic steel for arc extinguishing is arranged next to the contact point, the problem of insufficient short-circuit current resistance and arc extinguishing ability in the prior art is solved, and higher short-circuit current resistance and better core retention are achieved.

CN111091987BActive Publication Date: 2025-04-04XIAMEN HONGFA ELECTRIC POWER CONTROLS CO LTD
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Patent Information

Application Number
CN201911422798.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2019-12-31
Publication Date
2025-04-04
Estimated Expiration
2039-12-31

AI Technical Summary

Technical Problem

The existing DC relays have shortcomings in terms of short-circuit current and arc extinguishing, especially when the short-circuit current is large, the iron core is not maintained, the iron core is released, and the contacts are separated; at the same time, the arc extinguishing magnetic field causes the dynamic reed to be subjected to the Lorenz force, which affects the short-circuit resistance.

Method used

A combined structure of fixed upper yoke, follower upper yoke and lower armature is adopted to form two partially overlapping magnetic rings, increase the electromagnetic suction force to resist electric repulsion, and magnetic steel for arc extinguishing is arranged next to the contact point to form an appropriate arc extinguishing magnetic field to eliminate the Lorenz force.

Benefits of technology

The DC relay's short-circuit current resistance is significantly improved to reach the 16kA level, and by eliminating the Lorenz force, the short-circuit current resistance is improved, avoiding the problem of the iron core not retaining.

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Abstract

The present invention discloses a DC relay capable of resisting short-circuit current and arc extinguishing, comprising two static contact lead-out terminals, a straight-type moving spring and a push rod component; further comprising a fixed upper yoke, a follower upper yoke and a lower armature; the fixed upper yoke is fixed above the push rod component at a position corresponding to the position between the two moving contacts of the moving spring, the follower upper yoke is fixed in the push rod component above the moving spring at the position, and the lower armature is fixed to the bottom end surface of the moving spring at the position; the fixed upper yoke, the follower upper yoke and the lower armature are respectively distributed along the width of the moving spring, and two magnetic conductive rings are formed on the width of the moving spring. The present invention can increase the electromagnetic attraction, thereby greatly improving the product's ability to resist short circuits, and has a level of resisting short circuit currents up to 16kA.
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