A self-locking low energy consumption high power contactor

Abstract

The invention belongs to the technical field of ground engineering, and particularly relates to an electromagnetic self-locking type contactor. The electromagnetic self-locking type contactor comprises an electromagnetic self-locking mechanism, a contactor bottom plate support [16], an iron core [18], a magnet exciting coil [22], a second armature [21], an armature fixing frame [20], a spring bayonet lock [23] and a compression reset spring [19]. By means of balancing of various kinds of acting force, the stabilizing design of minimum energy consumption of a locking coil is achieved, the structure is simple and reliable, the power of the locking coil can be about five percent that of the magnet exciting coil, the total energy consumption of an energy-saving type alternating current contactor can be reduced by more than 90 percent relative to that of a conventional alternating current contactor, and the heating, noise and other problems of the contactor are solved.

Description

technical field [0001] The invention belongs to the technical field of ground engineering, and in particular relates to an electromagnetic self-locking low-energy-consumption high-power contactor. Background technique [0002] When the electrical equipment control system involves breaking and isolating the lines with current loads, AC contactors are generally used to switch them on and off. The working principle of the electromagnetic self-restoring contactor is as follows: After the excitation coil is energized, magnetic flux and electromagnetic attraction are generated in the iron core. This electromagnetic suction overcomes the spring reaction force to make the armature pull in, drive the contact mechanism to move, the main normally open contact is closed, and the circuit is connected. When the excitation coil is de-energized, the electromagnetic attraction force is smaller than the reverse force of the spring, so that the armature is released, and the contact mechanism ...

AI Technical Summary

Problems solved by technology

[0005] 1. The excitation coil is designed according to the high-current start-up and high-consumption mode. When the armature is relatively maintained, the energy consumption is relatively excessive, which is a serious waste of energy, and there is a very high general heating problem, which accelerates the aging of the coil insulation and reduces the service life.

[0006] 2. CJ20 series AC contactors should be installed vertically, but our site is installed horizontally without exception, which seriously affects the normal operation of the main components:

[0007] (1) The armature is a suspension part, and the center of gravity shifts after being installed horizontally. When the armature is engaged, one side of the bottom end of the armature is worn and then hits the fixed iron core first, resulting in uneven contact between the two ends. After a long time, the armature will produce serious low-frequency vibration noise;

[0008] (2) Also due to the above reasons, the contact time between the moving contact and the fixed contact will be different

[0009] Synchronization, the contact end surface of the contact cannot guarantee the balanced pressure and speed, resulting in poor contact of the contact, arc burns or even burning

[0010] (3) During the operation of the contactor, the overall stability decreases, and the comprehensive fault increases

CN1107963C [Mechanical self-locking AC contactor] belongs to the design of mechanical self-locking and mechanical unlocking. Its defect is that too many times of unlocking will cause the lock hook to wear out and cannot be used

The material is selected to use a coil with an iron core. Although the ability to absorb the armature is increased, the current passing through the coil is a direct current due to the influence of the transistor. Over time, the iron core will have its own magnetism, resulting in a gap between the moving armature and the static armature. Cannot be separated, making the AC contactor unusable

Images