Load terminal for high voltage direct current relay

Abstract

The invention discloses a load terminal for a high voltage direct current relay. The load terminal comprises connection ends, and lead-out ends set on a relay ceramic cover. Storage slots are set on heads of the lead-out ends. Flange parts are formed at lower parts of the connection ends. The flange parts are adaptively inserted into the storage slots. Fitted bottom surfaces of the flange parts and the storage slots are in brazing connection through utilization of brazing layers. Pressure blocks capable of fitting with the flange parts are set at openings of the storage slots. The pressure blocks are fixedly connected with the heads of the lead-out ends. Through fitting of the pressure blocks and the flange parts, the flange parts can be pressed in the storage slots, thereby preventing fall-off of the connection terminals. According to the load terminal, the maximum torque value borne by the connection ends is relatively great, the load terminal has good universality, and the connection terminals of various thread specifications can satisfy a torque requirement in application. Through fitting of the pressure blocks and the flange parts, the flange parts can be pressed in the storage slots, thereby preventing the fall-off of the connection terminals. Through fitting of the pressure blocks and the flange parts, verticality of end faces of the connection terminals and the lead-outends can be further improved. The load terminal has good welding quality and application 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 ends of oxygen-free copper material are directly machined into an external thread form to form an external threaded connection end. The lead-out ends need to be brazed on the ceramic cover of the relay during production. When the oxygen-free copper is brazed at high temperature, the hardness will decrease, resulting in a decrease in the maximum torque that the external threaded connection end can withstand. In actual application, the torque requirement cannot be met, which will cause the load terminal to slip or break and shorten the relay’s Service life. 2. The lead-out end and the screw made of oxygen-free copper are fixed with threaded glue. Due t...

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.

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