Direct current contactor with pressure release protection mechanism

Abstract

The invention discloses a direct current contactor with a pressure release protection mechanism. The direct current contactor comprises a sealed shell, an inner cavity of the sealed shell is provided with two fixed contacts arranged side by side, a movable moving contact piece, and a vertically-arranged push rod, the push rod can drive the moving contact piece to be respectively connected or disconnected with the two fixed contacts, the outside of the lower portion of the sealed shell is connected with a base shell in a positioning and sleeved manner, the base shell and an outer wall of the lower portion of the sealed shell are encircled to form a sealing chamber, the inner side of the sealing chamber is filled with a gas medium, and the sealing chamber can also communicate with the inner cavity of the sealed shell. Therefore, the arc-extinguishing medium component is maintained invariant, the internal air pressure of the direct current contactor is effectively reduced, the arc is smoothly extinguished, the final switch-off of the direct current contactor is guaranteed, the capability for cutting off an abnormal load by the direct current contactor is improved, the risk of the damage to the direct current contactor under the abnormal load is reduced, and the security of the direct current contactor and a matching apparatus is guaranteed.

Description

technical field [0001] The invention relates to the technical field of contactors, and specifically provides a DC contactor with a pressure relief protection mechanism. Background technique [0002] In order to improve the load capacity of the DC contactor, the conventional processing method of the manufacturer is to adopt a structural seal design, including ceramic seals and potting seals. However, because the structure of the DC contactor is designed as a sealed cavity, when the DC contactor cannot be disconnected normally due to abnormal load or function, the arc between the contacts will continue to burn, and the gas medium will expand when heated, which will affect the internal pressure of the sealed cavity. Gradually increase, and when the pressure increases to a certain level, the DC contactor structure will not be able to bear it and burst damage will occur, thus affecting the normal use of supporting devices. [0003] In view of this, the present invention is propo...

AI Technical Summary

Problems solved by technology

However, because the structure of the DC contactor is designed as a sealed cavity, when the DC contactor cannot be disconnected normally due to abnormal load or function, the arc between the contacts will continue to burn, and the gas medium will expand when heated, which will affect the internal pressure of the sealed cavity. Gradually increase, and when the pressure increases to a certain level, the structure of the DC contactor will be unable to bear it and burst damage will occur, thus affecting the normal use of supporting devices

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