DC contactor with high short-circuit resistance

Abstract

The invention discloses a direct current contactor with high short-circuit resistance, include a housing, two stationary contacts are mounted in the inner cavity of the housing, A movable contact plate and drive mechanism, A movable contact piece and two static contact points are vertically opposed to each other, the actuate mechanism has a coil, The mover and the push rod are further provided with a receiving member made of ferromagnetic material and used for receiving the movable contact piece and a stopper made of ferromagnetic material, the receiving member is movably sleeved on the upperpart of the push rod together with the movable contact piece, the stopper is positioned sleeved on the upper part of the push rod and is also positioned above the receiving member and the movable contact piece; When the movable contact pieces are respectively in attractive communication with the two static contacts, a magnetic circuit gap can be formed between the stopper and the top side of the receiving piece to generate an upward electromagnetic attractive force in the direction of receiving force to the movable contact pieces. As a result, the working stability and short-circuit resistanceof the DC contactor can be greatly improved by ensuring that the moving contact pads and the two static contacts remain attractive under the condition of large current.

Description

technical field [0001] The invention relates to the technical field of DC contactors, and specifically provides a DC contactor with high short-circuit resistance capability. Background technique [0002] The conventional structure of DC contactors currently on the market is as follows: it includes a housing, and two static contacts arranged side by side, a moving contact piece and a driving mechanism are installed in the inner cavity of the housing, and the moving contact piece is connected to the two The static contacts are respectively vertically oppositely arranged, and the driving mechanism has a coil, a mover, a push rod and a return spring, the coil is positioned at the lower part of the inner cavity of the housing, and the mover is movable. In the space surrounded by the coils, the push rods are vertically arranged, and the lower ends of the push rods are tightly fitted through the mover, and the upper parts of the push rods are in contact with the moving contact piec...

AI Technical Summary

Problems solved by technology

However, the spring force of the contact spring is too strong, which will affect the reset operation of the drive mechanism, making the working stability of the DC contactor product poor.

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