Novel long-life DC contactor structure

Abstract

The invention discloses a novel long-life direct current contactor structure. A movable contact is arranged in a ceramic cavity, static contacts are arranged above the left end and the right end of the movable contact respectively, the leading-out ends of the static contacts extend out of the ceramic cavity, and arc extinguishing grid pieces are correspondingly arranged on the outer sides of the movable contact and the two static contacts; an upper supporting plate is arranged in the middle of the upper side of the movable contact, a lower supporting plate is correspondingly arranged on the lower side of the movable contact, a final pressure spring is arranged between the movable contact and the lower supporting plate, the lower supporting plate is connected with the movable iron core through a push rod penetrating through the magnet yoke plate, and an auxiliary reed is arranged on the push rod. A yoke is arranged outside the ceramic cavity, permanent magnet steel sheets are arranged on the yoke in an adsorption manner, the two groups of permanent magnet steel sheets are symmetrically distributed on the outer sides of the movable contact and the two static contacts, and electric arcs are extinguished through the arc extinguishing grid sheets, the permanent magnet steel sheets and inert gas filled in the ceramic cavity. According to the invention, the arc root can be quickly transferred and the arc can be extinguished, thereby greatly prolonging the electrical life of the product.

Description

technical field [0001] The invention belongs to the technical field of switching appliances, and in particular relates to a novel long-life DC contactor structure. Background technique [0002] The electrical life of DC contactors, especially high-voltage DC contactors, is an important indicator that is difficult to improve at present. In the field of new energy vehicles, photovoltaics and energy storage, in order to reduce costs and reduce energy consumption, the system voltage is gradually increased. As a DC contactor for protection and control, as the voltage continues to increase and the demand for current-carrying capacity continues to increase, Its electrical life decreases rapidly. The solution to improve electrical life is mainly to shorten the probability of arc generation and reduce the time of arc burning. The existing technology mainly solves the problems by providing permanent magnet steel sheets with stronger magnetism and increasing the opening distance of t...

AI Technical Summary

Problems solved by technology

The existing technology is mainly solved by providing permanent magnet steel sheets with stronger magnetism and increasing the opening distance of dynamic and static contacts. It is difficult to fundamentally solve the problems of arc generation and arc burning time.

On the other hand, the placement position and matching method of the permanent magnet steel sheet are important factors affecting the electrical life parameter index of the DC contactor. The DC contactor product has a certain polarity, which limits the promotion of its application.

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