Alternating current contactor

Abstract

The invention discloses an alternating current contactor, which comprises a shell, a static iron core, a coil, a movable iron core, a movable bracket and a fixed bracket which are arranged in the shell, and a movable contact and a static contact which are installed on the movable bracket and the fixed bracket respectively, wherein a looseness detection device for detecting looseness of the movablecontact is arranged in the shell. According to the alternating current contactor, a contact looseness detection device is arranged in the alternating current contactor, and a micro air pressure sensor is arranged on a substrate corresponding to a movable contact, so that when the movable contact and the substrate loosen, airflow generated by a cooling fan enters the sealing shell through a through hole and is in contact with the micro air pressure sensor, and at the moment, the micro air pressure sensor can achieve the effect of quickly detecting the movable contact, and gives an alarm through a buzzer so as to quickly remind a worker, further reduce the potential safety hazard and enable the safety performance of the alternating current contactor to be high.

Description

technical field [0001] The invention relates to the technical field of AC contactors, in particular to AC contactors. Background technique [0002] AC contactors often use three arc extinguishing methods: double-break electric arc extinguishing, longitudinal slot arc extinguishing and grid arc extinguishing. It is used to eliminate the arc generated during the opening and closing process of moving and static contacts. Contactors with a capacity above 10A have arc extinguishing devices. AC contactors also have auxiliary components such as reaction springs, buffer springs, contact pressure springs, transmission mechanisms, bases, and terminal posts. [0003] At present, when the existing AC contactor is in use, because the AC contactor is in the process of closing the switch for many times, that is, the coil is energized, and the contact is driven by the connecting rod to move, so as to realize the contact between the moving contact and the static contact. Connection, and i...

AI Technical Summary

Problems solved by technology

[0003] At present, when the existing AC contactor is in use, because the AC contactor is in the process of closing the switch for many times, that is, the coil is energized, and the contact is driven by the connecting rod to move, so as to realize the contact between the moving contact and the static contact. Connection, and in the process of connecting the moving contact and the static contact, it is also a process of mutual collision and friction. This process is repeated for a long time, which will cause the mutual wear of the moving contact and the static contact, and when the degree of wear exceeds 1mm, The moving contact will be burned, and at the same time, the connection between the moving contact and the substrate will be loose. At the same time, because the moving contact is inside the AC contactor, the staff cannot find it in time, and there is a certain degree of safety. hidden danger, for this reason, we propose AC contactor

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