Improved Structure of Ceramic Seal of DC Contactor

Abstract

The invention discloses a direct current contactor ceramic sealing improvement structure. The structure comprises a metal cavity, a static contact point and a coil. The static contact point and an outgoing line of the coil are fixedly connected with the metal cavity through a ceramic component in a sealing mode. The metal cavity is a hollow cylinder with one end being open. One side surface of the ceramic component in a panel shape is fixedly connected to an open end of the metal cavity in the sealing mode. Several through holes, which correspond to positions of the static contact point and the outgoing lines, are positioned and arranged on the ceramic component. The periphery of one end of the several through holes, which are towards the other side surface of the ceramic component, forms a circle of first annular bosses which are protruded out of the other side surface of the ceramic component. Outer peripheral surfaces of the several first bosses are printed with a metallization layer respectively. Compared to metallization processing and sealing in the holes of a current direct current contactor ceramic sealing portion, by using the structure disclosed by the invention, the metallization processing and the sealing connection of the ceramic sealing portion are transferred outside the holes, so that the production cost is reduced, and the sealing performance of a product and a welding yield rate of the ceramic sealing are improved.

Description

technical field [0001] The invention relates to the technical field of DC contactors, in particular to an improved structure of ceramic seals for DC contactors. Background technique [0002] At present, there are two main sealing methods for the improved structure of DC contactor ceramic seals on the market: one is sealed with epoxy resin, and the other is sealed with flat ceramic parts. [0003] The use of epoxy resin for sealing can basically achieve the purpose of sealing the contact point of the contactor in a protective atmosphere, but because the sealing reliability between epoxy resin and metal is low, and its ability to withstand high temperature and thermal shock is relatively weak. Therefore, the assembly structure sealed with epoxy resin is relatively complicated and the production cost is high. [0004] figure 1 It shows the sealing structure using planar ceramic parts in Patent No. CN201010234827.0, which needs to carry out metallization treatment on the ceram...

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Problems solved by technology

[0003] The use of epoxy resin for sealing can basically achieve the purpose of sealing the contact point of the contactor in a protective atmosphere, but because the sealing reliability between epoxy resin and metal is low, and its ability to withstand high temperature and thermal shock is relatively weak. Poor, so the assembly structure sealed with epoxy resin is more complicated and the production cost is high

[0004] figure 1 It shows the sealing structure using planar ceramic parts in Patent No. CN201010234827.0, which needs to carry out metallization treatment on the ceramic part and in the sealing holes corresponding to the static contact point 4 and the lead-out line 50, but this metallization On the one hand, the processing method is not suitable for mass production. Most of the existing methods are manually operated, and the production efficiency is very low; on the other hand, the expansion coefficients of metal and ceramics are not the same. The transition thread sleeve 9 in the hole is fixed, thereby increasing the production cost; and for the lead-out line 50, it is easy to cause air leakage, which affects the product yield

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