Direct current high-current appliance switch

Abstract

The invention discloses a direct current high-current appliance switch. The direct current high-current appliance switch comprises a press rod assembly, a plunger, an upper cover, an outer casing, an F spring, a moving contact piece assembly and a stationary contact piece assembly, wherein the plunger is glidingly arranged in a guide rail cavity between the upper cover and the outer casing left and right, the press rod assembly is arranged in the plunger, and the F spring is arranged at the right end of the plunger; the moving contact piece assembly comprises a moving contact head and a moving contact piece; the stationary contact piece assembly comprises a stationary contact head, a stationary contact piece II and a stationary contact piece I; the press rod assembly is swung around the center axis of the arc-shaped supporter with small angle. The direct current high-current appliance switch has the advantages that the design is reasonable, the turning speed of the moving contact piece is improved by the press rod assembly which can be swung left and right according to the specified amplitude, and the mechanical dead point is eliminated; the moving contact piece is buckled onto a terminal by a reed, and the moving contact piece and the terminal are always forced to contact with each other; the stationary contact piece assembly is of a splitting structure, so that the adhering due to electric arc caused by instantaneous jumping in the closing process of the contact head is prevented; the stationary contact piece assembly is of a double conduction structure, so that the reliability in the continuous energizing of high current is guaranteed.

Description

technical field [0001] The invention relates to a switch, in particular to a DC high-current appliance switch. Background technique [0002] When the load voltage exceeds 60V and the current exceeds 20A, the arc generated by the DC mechanical on-off switch at the moment of contact on-off and the heat generated by the internal resistance of the switch during long-term power-on become the main reasons affecting the performance and life of the switch. The existing technology has the following disadvantages: 1. During the switch-on process, if the contact pressure is too low at the moment of contact closure, the contacts will generate serious heat, especially when the operating speed is low and the energizing current is large, static welding will occur ;At the moment when the switch contacts are disconnected, the high-current switch will generate a very serious arc. If the disconnection speed is not fast enough, the arc will continue to burn, and dynamic welding will occur; fusi...

AI Technical Summary

Problems solved by technology

The existing technology has the following disadvantages: 1. During the switch-on process, if the contact pressure is too low at the moment of contact closure, the contacts will generate serious heat, especially when the operating speed is low and the energizing current is large, static welding will occur ;At the moment when the switch contacts are disconnected, the high-current switch will generate a very serious arc. If the disconnection speed is not fast enough, the arc will continue to burn, and dynamic welding will occur; fusion welding between the dynamic and static contacts of the switch will cause the switch to fail

2. During the ON operation of the switch, when the pressure rod quickly crosses the fulcrum, the dynamic pressure from the pressure rod on the moving contact piece will be slightly reduced. For the static contact, due to the inertia during the movement of the moving contact piece, the moving contact piece will have a tendency to detach from the terminal instantaneously. In addition, due to factors such as the placement angle of the switch and the vibration of the tool where it is working, the moving contact piece will move when the switch is turned on. There will be a momentary arc between the contact piece and the terminal, which will cause mild electric erosion or welding. Long-term accumulation will cause the switch to generate heat and reduce the reliability of use.

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