CN2452125Y - Phase-defect protection AC contactor - Google Patents

Abstract

The utility model discloses a phase failure protection alternating current contactor composed of a contact bridge, a static contact, an arc extinguishing chamber, an armature, a coil, an iron core, a contact bracket, a reaction spring, etc. A module is particularly connected in series with the coil, and the module comprises a diode, a resistor and a bidirectional triode thyristor. The modular has the function of cutting off the current of the coil when the wires of any phase are disconnected, so that the phase failure operation of a motor is stopped in order to ensure the safety of equipment. The utility model has the advantages of compact structure, complete function and safe and reliable use, is widely used for various electric distribution lines and is particularly suitable for the control circuits of motors.

Description

The open-phase protection A.C. contactor

The utility model belongs to a kind of basic electrical equipment original paper, particularly a kind of open-phase protection A.C. contactor, and it is to the improvement of existing A.C. contactor and perfect.

Existing interchange tentaculum has the function of connection, branch deenergizing and frequent starting, control motor, uses very extensive.In the control circuit of motor, because a variety of causes (as blown fuse of the power transformer phase failure or front or the like), cause that do not link ac contactor coil to break mutually, then A.C. contactor can not reacted to this, motor will be among the phase-deficient operation for a long time, causes motor overheating easily and burns.At the construction field (site), this type of accident occurs now and then.

The purpose of this utility model is, overcomes the shortcoming that existing A.C. contactor exists aspect open phase protection, and a kind of open-phase protection A.C. contactor that improves the open phase protection ability that has is provided, and makes motor avoid phase-deficient operation, thereby prevents the generation of accident.

Technical solution of the present utility model is; a kind of open-phase protection A.C. contactor; it is made up of contact bridge, fixed contact, contact supporting, arc control device, iron core, armature and coil etc., it is characterized in that being connected with module with coil, and this module includes bidirectional triode thyristor, diode and resistance.Its effect is: when broken string takes place mutually, just cut off the electric current of coil when arbitrary, make motor stop phase-deficient operation, thereby obtain protection.

Below in conjunction with electrical schematic diagram of the present utility model and enforcement illustration, the utility model will be further described.

Accompanying drawing 1 is an electrical schematic diagram of the present utility model;

Accompanying drawing 2 is complete section Visual figure of present embodiment.

Present embodiment is made up of contact bridge (2), fixed contact (3), arc control device (1), armature (4), (5), coil (6) unshakable in one's determination, contact supporting (9), reaction spring (8) and module (7) etc.

When pressing start button (13), coil (6) is switched on, and armature (4) is under (5) unshakable in one's determination attract, compression reaction spring (8) makes contact supporting (9) operation downwards, contact bridge (2) and fixed contact (3) closed (auxiliary contact (14) is closed simultaneously), the circuit energized is in running status.Arbitrary broken string mutually takes place when being in operation, module (7) is even coil (6) outage, armature (4) loses the electromagnetic attraction of iron core (5), under the effect of reaction spring (8), contact supporting (9) moves upward, contact bridge (2) separates (auxiliary contact (14) is opened simultaneously) with fixed contact (3), circuitry cuts, and phase-deficient operation stops.

By accompanying drawing 1 as can be known, module (7) contains diode (10), resistance (11) and bidirectional triode thyristor (12).When U breaks mutually, the anode decompression of bidirectional triode thyristor (12) and can not conducting then, coil (6) promptly is de-energized; When V broke mutually, the control utmost point bias voltage of bidirectional triode thyristor (12) was zero, and same bidirectional triode thyristor (12) can not conducting, and makes coil (6) outage; W breaks mutually and also makes coil (6) outage.So module (7) is all cut off the electric current of coil (6) arbitrary when breaking mutually, thereby make whole circuit outage.

In addition, before starting the open-phase protection A.C. contactor, if there is the phase failure, even if press the button (14), coil (6) will not have electricity, circuit can not put into operation.After having only the open-phase fault of elimination, could start.Scented a hidden danger before operation, this is another advantage.

The utility model is multiple functional, and reliable operation and safety, structure are also compact, compares with like product, and its function is more perfect, and body there is no increase.

Claims (2)

1. One, a kind of open-phase protection A.C. contactor, it is made up of contact bridge, fixed contact, arc control device, armature, iron core, coil, contact supporting and reaction spring etc., it is characterized in that being in series with module (7) with coil (6).
2. Two, open-phase protection A.C. contactor according to claim 1 is characterized in that module (7) includes diode (10), resistance (11) and bidirectional triode thyristor (12).

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