Ceramic packaging high-voltage direct-current contactor with auxiliary contacts

Abstract

The invention discloses a ceramic packaging high-voltage direct-current contactor with auxiliary contacts. The ceramic packaging high-voltage direct-current contactor comprises a shell and a pushing apparatus; a ceramic shell in the shell adopts a two-stage step shape, wherein the width of the second step in the lower stage is wider than that of the first step in the upper stage; a first hollow cavity and a second hollow cavity are formed in the first step and the second step respectively; the upward side of a push rod convex shoulder is sleeved with an arc extinguishing cover in the pushing apparatus in an upward opening manner; the outer wall of the arc extinguishing cover upwardly extends into the first hollow cavity in the first step, and then the first hollow cavity and the second hollow cavity are separated by the arc extinguishing cover, and an arc extinguishing chamber is formed by the first hollow cavity and the arc extinguishing cover; the arc extinguishing cover extends horizontally towards one side of the second hollow cavity to form an arc extinguishing cover extension plate; auxiliary wafers are fixed at the tail end of the arc extinguishing cover extension plate through rivets, and the auxiliary wafers are upward; and auxiliary contacts which extend to the second hollow cavity are arranged on the second step corresponding to the auxiliary wafers. The ceramic packaging high-voltage direct-current contactor is simple in structure, high in stability and airtightness, and can be widely applied to the fields of a new energy automobile, electric vehicle charging equipment, a photovoltaic power generation system and the like.

Description

technical field [0001] The invention relates to the field of DC contactors, in particular to a ceramic-encapsulated high-voltage DC contactor with auxiliary contacts. Background technique [0002] The contactor is an automatic control device that uses a coil to flow current to generate a magnetic field to close the contacts to achieve control of the load. As a kind of contactor, high-voltage DC contactor is widely used in new energy vehicles, electric vehicle charging equipment, photovoltaic power generation systems and other fields, and has the functions of starting, disconnecting and converting power supply. [0003] In high-voltage DC contactors, in order to detect whether the contactor is connected during operation, auxiliary contacts are usually provided. However, due to the different internal structures of high-voltage DC contactors, the structure and settings of auxiliary contacts are also different. [0004] For example, in the Chinese patent document whose authoriz...

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Problems solved by technology

[0004] For example, in the Chinese patent document whose authorized announcement number is CN206225294U, in the DC contactor with auxiliary contacts, an auxiliary moving spring with double auxiliary moving contacts is directly added to the pushing mechanism, and at the position corresponding to the double auxiliary moving contacts There are at least two auxiliary terminals with auxiliary static contacts. It can be seen from the drawings of the above-mentioned patents that the double auxiliary movable contacts are respectively arranged on both sides of the push mechanism, regardless of whether there are two or four auxiliary terminals. , and regardless of whether the auxiliary terminal is an auxiliary normally open terminal or an auxiliary normally closed terminal, the internal structure of the DC contactor with the above structure is complicated; in addition, the active contact, main static contact, auxiliary dynamic Both the contact and the auxiliary static contact are housed in the ceramic cavity of the ceramic case. This structure easily makes the auxiliary movable contact and auxiliary static contact affected by the arc during the arc extinguishing process, making the DC contactor unstable.

[0005] In the prior art, the metal exhaust pipe used to pump and inflate the high-voltage DC contactor is seamlessly connected to the ceramic shell by brazing. However, when used in harsh environments for a long time, the metal exhaust pipe The joint with the ceramic shell made of ceramic material is prone to cracking and air leakage

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