Fully-sealed high-voltage DC relay

Abstract

The invention discloses a fully-sealed high-voltage DC relay, which comprises two static contact leading-out ends, a movable contact spring, a ceramic cover and a plastic frame, wherein two static contact leading-out ends are mounted on the ceramic cover respectively, and the upper part of the plastic frame is accommodated in a first cavity of the ceramic cover; a second cavity is formed in the plastic frame; through holes are formed in the upper wall body of the second cavity, and bottom ends of the static contact leading-out ends extend into the second cavity of the plastic frame and are matched with the moving contact spring; arc-extinguishing magnetic steel is arranged in the vicinity of positions where moving contacts and static contacts are matched, and leads electric arc to preset directions; and open grooves capable of guiding the electric arc out of the plastic frame are formed in the side wall bodies of the second cavity of the plastic frame corresponding to the preset directions of the electric arc. The fully-sealed high-voltage DC relay can enlarge the arc extinguishing space, accelerate the extinction of the arc, ensure the cleanness of the internal structure of the frame, increase the insulation resistance after the electrical endurance, and cool the electric arc.

Description

technical field [0001] The invention relates to the technical field of relays, in particular to a fully sealed high-voltage direct current relay. Background technique [0002] The relay is an electronic control device, which has a control system (also known as the input circuit) and a controlled system (also known as the output circuit), usually used in automatic control circuits, it actually uses a smaller current to control a larger An "automatic switch" of electric current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit. The DC relay is one of the relays. Most of the existing DC relays adopt the scheme of moving reed direct action (also known as solenoid direct action). The contact part of the DC relay includes two static contacts and a The moving assembly, the static contact includes the static contact and the lead-out end of the static contact, the moving assembly includes the moving spring part and the p...

AI Technical Summary

Problems solved by technology

A high-voltage DC relay in the prior art adopts a fully-sealed structure. For this high-voltage DC relay with a fully-sealed structure, in order to insulate the product and arrange the auxiliary contacts, a plastic frame is generally added inside the cavity, which causes The inner space of the cavity is reduced, and the arc extinguishing space is also reduced accordingly

Most of the plastic frames of the high-voltage DC relays in the prior art adopt a closed form, that is, a closed cavity is provided. The static contact and the movable contact are accommodated in the cavity of the plastic frame. The through hole through which the lead-out end of the static contact extends, the high-voltage DC relay of the prior art has the following disadvantages: (1) the arc extinguishing space is small, and the arcing time is long; (2) the evapotranspiration generated during the arcing process Stacked inside the cavity of the plastic frame, polluting the cavity, resulting in a serious drop in insulation resistance after the electrical life

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