Direct-current relay capable of resisting short circuit current and extinguishing arc

Abstract

The invention discloses a direct-current relay capable of resisting short circuit current and extinguishing arc. The direct-current relay comprises two static contact leading-out ends, a straight sheet type movable contact spring and a push rod part, , and further comprises a fixed upper yoke, a follow-up upper yoke and a lower armature. The fixed upper yoke is fixed above the push rod part corresponding to the position between the two movable contacts of the movable contact spring, the follow-up upper yoke is fixed in the push rod part corresponding to the position above the movable contact spring, and the lower armature is fixed on the bottom end surface of the movable contact spring corresponding to the position; the fixed upper yoke, the follow-up upper yoke and the lower armature arerespectively distributed along the width of the movable contact spring, and two magnetic conductive rings are formed on the width of the movable contact spring. The electromagnetic attraction force can be increased, so that the short circuit resistance of the product is greatly improved, and the short circuit resistance current reaches the level of 16 kA.

Description

technical field [0001] The invention relates to the technical field of relays, in particular to a DC relay capable of resisting short-circuit current and extinguishing arcs. Background technique [0002] The anti-short-circuit capability of DC relays is a relatively difficult indicator at present. At present, the anti-short-circuit current of high-voltage DC relays has reached the level of 16kA. When the short-circuit current passes through the movable and static contacts, the electric repulsion generated between the movable and static contacts will cause the contacts to repel, which will eventually lead to severe arcing and make the relay invalid. The root of solving short-circuit resistance is to ensure that the contacts are in reliable contact without bouncing off. In the prior art, a short-circuit current-resistant magnetic ring composed of an upper yoke and a lower armature is usually added to the moving reed. When the short-circuit current flows through the moving ree...

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Problems solved by technology

[0003] On the other hand, the high-voltage DC relays with direct-acting magnetic circuit structure in the prior art usually use magnetic blowout to extinguish the arc, that is, a magnetic steel is arranged around the contact point of the two moving and static contacts, and the magnetic field formed by the magnetic steel is used to realize magnetic switching. Blowing out the arc, although the magnetic blowing out the arc is beneficial to the arc extinguishing of the relay and improving the life capacity, but it will also cause a problem that the energized moving reed will be subjected to the Lorentz force under the magnetic field of the magnetic blowing out the arc, due to the magnetic blowing out the arc The layout of the magnetic circuit will cause the Lorentz force on the moving reed to be downward under the magnetic blowout magnetic field, so that the force on the moving reed is the resultant force of electric repulsion + Lorentz force. Once the resultant force > overtravel Contact pressure, then the dynamic and static contacts (moving and static contacts) will not be able to contact and close reliably, resulting in failure to bounce and arc

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