Load terminal of high-voltage direct-current relay

Abstract

The present invention discloses a load terminal of a high-voltage direct-current relay. The load terminal comprises a connection terminal and a lead-out terminal arranged on a relay ceramic cover, thehead of the lead-out terminal is provided with a holding hole, the lower end of the connection terminal is adaptively inserted into the holding hole and is in screw-thread fit connection with the holding hole, a pressing block is in brazed connection at the mouth of the holding hole of the lead-out terminal through soldering lug, the connection terminal is provided with a spacing portion matchedwith the pressing block, the matching of the pressing block and the spacing portion can press the lower end of the connection terminal into the holding hole to prevent the connection terminal from dropping off. The maximum torque value of the connection terminal is large to allow connection terminals with various thread specifications to meet the torque requirements when the connection terminals are used, the lower end of the connection terminal is pressed into the holding hole to prevent the connection terminal from dropping off through matching of the pressing block and the spacing portion,the connection terminal can be vertically connected with the lead-out terminal through screw-thread fit of a lower thread portion and a small hole, and therefore, the load terminal of the high-voltagedirect-current relay has good use reliability.

Description

technical field [0001] The invention relates to the technical field of high voltage direct current relays, in particular to a load terminal of a high voltage direct current relay. Background technique [0002] At present, the load terminals of high-voltage DC relays on the market mainly have the following structures: 1. The lead-out end made of oxygen-free copper is directly turned into an external thread form to form an external thread connection end, and the lead-out end needs to be brazed to the ceramic cover of the relay during production. In fact, when the oxygen-free copper hardness is reduced after high-temperature brazing, the maximum torque that the external thread connection end can bear decreases, and the torque requirement cannot be met in practical applications, resulting in the load terminal slipping or breaking, and shortening the relay. service life. 2. The lead-out end and the screw made of oxygen-free copper are fixed with thread glue. Because the temperat...

AI Technical Summary

Problems solved by technology

[0002] At present, the load terminals of high-voltage DC relays on the market mainly have the following structures: 1. The lead-out end made of oxygen-free copper is directly turned into an external thread form to form an external thread connection end, and the lead-out end needs to be brazed to the ceramic cover of the relay during production. In fact, when the oxygen-free copper hardness is reduced after high-temperature brazing, the maximum torque that the external thread connection end can bear decreases, and the torque requirement cannot be met in practical applications, resulting in the load terminal slipping or breaking, and shortening the relay. service life

2. The lead-out end and the screw made of oxygen-free copper are fixed with thread glue. Because the temperature of the lead-out end is too high during work, the glue is easy to age and cause failure

3. The lead-out end made of oxygen-free copper is welded with alloy copper screws, and the screws form an externally threaded connection end. Although the hardness of alloy copper (such as dispersed copper) does not decrease significantly after high-temperature brazing, the screws made of alloy copper cannot meet the requirements. Torque specifications for all thread specifications. After testing, screws with M10 thread specifications can meet the torque requirements during use, but M8 and M5 thread specifications cannot meet the torque requirements.

Moreover, when the load terminals in structure 2 and structure 3 are used, when the torque on the lead-out end of the external thread exceeds the maximum torque it can withstand, it will cause brazing failure, and the connection end may fall off.

Moreover, it is difficult to guarantee the perpendicularity between the existing connection end and the end surface of the lead-out end, and the connection end is prone to tilt during use, resulting in poor reliability of the load terminal.

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