DC relay

Abstract

The invention discloses a DC relay, and belongs to the technical field of relays. The DC relay comprises a bottom plate assembly, a housing assembly forming an accommodating space with the bottom plate assembly, two main static contacts, an active assembly, a connecting column assembly and a shielding case, wherein the two main static contacts are arranged on a main body part of the housing assembly at intervals; the active assembly comprises a poking part and a main moving contact, wherein the main moving contact can be in intermittent contact with the main static contact, and when the main moving contact makes contact with the main static contact, the poking part in the connecting column assembly can poke and trigger a microswitch in the connecting column assembly; the shielding case islocated in the accommodating space, and the shielding case divides the accommodating space into a first space and a second space; and the main static contact extends into the first space, the main moving contact is located in the first space, the microswitch is located in the second space, and the connecting column extends into the second space. The DC relay provided by the invention can prevent the influence on the microswitch when the main moving contact and the main static contact are switched on and off, so that the on-off condition of the DC relay can be effectively judged.

Description

technical field [0001] The invention relates to the technical field of relays, in particular to a DC relay. Background technique [0002] A DC relay is a DC control appliance that can be used in electric commercial vehicles, electric passenger vehicles or charging piles. [0003] At present, the main contact load of the DC relay is high voltage and high current. If the main contact is directly monitored by collecting the main contact signal, it will lead to high cost and high risk. The way to solve this problem in the prior art is to set a pair of auxiliary contacts to feed back and monitor the on-off state of the main contact of the DC relay through a low-voltage signal. Specifically, the auxiliary contacts are integrated with the main contacts in the DC relay. [0004] In the prior art, the DC relay includes a base, a ceramic shell fixed on the base, a push rod that can slide relative to the base, a main static contact fixed on the ceramic shell, and is arranged in the a...

AI Technical Summary

Problems solved by technology

[0005] However, during the on-off process of the active contact and the main static contact, evapotranspiration will be generated, and since the auxiliary contact and the active contact are located in the same accommodation space, the evapotranspiration is more likely to contaminate the auxiliary contact, thereby causing the auxiliary contact point failure, so that it is impossible to effectively judge the on-off situation of the DC relay

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