CN2368153Y - Self-holding energy-saving type ac. contactor - Google Patents

Abstract

The utility model relates to a self-holding energy-saving type A. C. contactor, which is improved on the basis of an original A. C. contactor. An iron core is made of soft magnetic materials, a contact supporter of an auxiliary contact set is disconnected and divided into an upper contact support and a lower contact support, and a strongly magnetic magnet and a magnetism conducting plate are arranged between the upper contact support and the lower contact support. Coupling screws can be used for adjusting a definite distance, the auxiliary contact has the function of delaying time, and control circuits have two types, such as a (manual or automatic) power failure without release type and a power failure release type. The utility model has the advantages of energy saving, no noise, no burn to coils, etc., and compared with an interlocking hook-type contactor, the utility model has higher cost performance.

Description

The self-sustaining energy-saving alternating current contactor

The utility model relates to the A.C. contactor in the low-voltage electrical apparatus, refers in particular to the improvement to former A.C. contactor.

" low-voltage electrical apparatus is selected servicing manual for use " (Zheng Mingfang chief editor, China Machine Press, nineteen ninety-five), structure and operation principle to general contactor have been done detailed introduction, and on the basis of former A.C. contactor, be modified into energy-saving contactor, and mainly contain two kinds of modes, the one, utilize the afterflow theory, AC starting, direct current keep or direct current starts, direct current keeps promptly so-called energy-saving silencing contactor; The 2nd, adopt the mechanical chain hook, as " magnetic locking contactor " (application number 91110753), connect the tapered end of a hook with lock in the yoke bottom of former contactor, and be provided with cooperate with it by the small-sized DC relay, the locking lever, the locking device of compositions such as balancing spring makes, fixed contact continues to keep adhesive, but this A.C. contactor utilizes electronic component to control the action of mechanical structure and the locking action of mechanical structure is to force adhesive locking mechanical structure to realize by the magnetic field that stops to produce behind the coil electricity, so poor reliability, more owing to increased electronic component and mechanical chain system, its cost is increased, reduce useful life, therefore is difficult to apply.

" energy-saving alternating current contactor " (ZL86204002 stops) adopted a kind of new electromagnetic system, but do not relate to the improvement of auxiliary contact group wherein." energy-saving alternating current contactor " (ZL87208809 abandons) is characterized in that lever arm, moving contact, soft iron core, permanent magnet are associated in and constitutes dynamic component together." energy-saving alternating current contactor " (ZL92237393 stops) increased electromagnetic locking mechanism on the basis of original A.C. contactor." energy-saving alternating current contactor " (ZL93240886 stops) also is to have increased by a cover electromagnet mechanism on the basis of former A.C. contactor." high energy-saving type A.C. contactor " (94216094) also are coupling types.

The purpose of this utility model is to provide a kind of self-sustaining energy-saving alternating current contactor, its noiseless, no energy consumption, does not generate heat, uses reliable, low cost of manufacture.

For achieving the above object, the solution that the utility model adopts is: a kind of self-sustaining energy-saving alternating current contactor, comprise iron core, coil KM, base, armature, touch spring, fixed contact, moving contact, arc-extinguish chamber, contact supporting, auxiliary contact group and control circuit, described iron core is made by soft magnetic material; Contact supporter in the described auxiliary contact group disconnects and is divided into upper contact head support and following contact support, be fixed with magnetic conductive board under the upper contact head support, connect with attachment screw between upper contact head support and the following contact support, following contact supports the upper end cover to connect screw certain up and down distance, in the body, place two blocks of ferromagnetism magnet symmetrically and be on the magnetic conductive board, ferromagnetism magnet adhesive magnetic conductive board when contactor is not worked; Described control circuit, press start button QA, constitute the connection loop by normally closed contact F2, diode V1, start button QA, coil KM gets electric excitation, diode V2 is that coil KM constitutes a loop when the power-half cycle, press stop button TA, constitute the branch deenergizing by normal opened contact F1, current-limiting resistance R1, stop button TA, coil KM.

The utility model is to improve to form on the basis of prototype A.C. contactor, the one, change the iron core of former contactor into soft magnetic material (A3 soft iron plate) by silicon (silicon) steel disc, because the hysteresis characteristic of soft magnetic material, under DC excitation, iron core is by direction and big or small periodically variable electric current remagnetization, moment produces big magnetic field with little electric current, the iron core adhesive, by sharp magnetic magnetic flux and coercitive product amount, be that retentivity keeps, contactor disconnects exciting current, the sharp magnetic of iron core still remains on the attracted position, when with reverse direct current or alternating current degaussing, during demagnetize, the stable magnetic potential of iron core is taken back ring gradually periodically weaken and diminish, when retentivity reduced to the reaction force critical value, contactor reliably discharged.Therefore contactor is at adhesive obstructed exciting current in service.Thereby reach energy-conservation, noiseless, do not burn out the purpose of coil.Because iron core uses soft magnetic material (A3 soft iron plate) without short-circuited conducting sleeve, just can utilize former cored Mould Machining again, not increase processing charges, the iron core cost is descended significantly, be fit to produce in enormous quantities needs.The 2nd, auxiliary contact group in the former contactor is improved.It is whole that contact in the former auxiliary contact group props up part, break at the utility model to be divided into upper contact head support and following contact support, and between place ferromagnetism magnet and magnetic conductive board, attachment screw adjusting certain distance makes it to have delay function.The 3rd, increase control circuit.When pressing start button QA, through the about 50ms time-delay of auxiliary contact group, produce sharp magnetic behind the iron core remagnetization contactor is kept, even the probe of contactor closure, finish the connection program, diode V2 is that coil KM constitutes a loop when the power-half cycle, and the magnetic flux of sharp magnetic after the increase excitation is when pressing stop button TA, magnetic flux weakens and diminishes, the disjunction program is finished in contactor disjunction when retentivity reduces to reaction force, returns the connection program.

Below in conjunction with embodiment and accompanying drawing thereof the utility model is further described.

Fig. 1 is the structural representation of present embodiment.

Fig. 2 is the structural representation (during work) of auxiliary contact group (10) among Fig. 1.

Fig. 3 is one of control circuit of present embodiment.

Fig. 4 be present embodiment control circuit two.

Present embodiment is to improve to form on the basis of prototype A.C. contactor, as shown in Figure 1, it comprises iron core (1), coil KM (2), base (3), armature (4), touch spring (5), fixed contact (6), moving contact (7), arc-extinguish chamber (8), contact supporting (9), auxiliary contact group (10) and control circuit, iron core (1) is made by soft magnetic material, as using A3 soft iron plate.As shown in Figure 2, auxiliary contact group (10) comprises the body (11), auxiliary normal opened contact F1 (12), the auxiliary fixed contact (13) of often opening, the auxiliary contact (14) that often starts, auxiliary normally closed contact F2 (15), auxiliary normally closed moving contact (16), auxiliary normally closed fixed contact (17), spring (19), more than be prior art, the contact supporter disconnects and is divided into upper contact head support (18) and following contact support (23), upper contact head is supported to be fixed with magnetic conductive board (21) under (18), upper contact head is supported to connect with attachment screw (22) between (18) and the following contact support (23), following contact support (23) upper end cover connects screw (22) certain up and down distance, place two blocks of ferromagnetism magnet (20) in the body (11) symmetrically, be on the magnetic conductive board (21) ferromagnetism magnet (20) adhesive magnetic conductive board (21) when contactor is not worked.As shown in Figure 3, when control circuit is pressed start button QA (28), constitute the connection loop by normally closed contact F2 (15), diode V1 (25), start button QA (28), coil KM (2) gets electric excitation, diode V2 (26) is that coil KM (2) constitutes a loop when the power-half cycle, sharp magnetic magnetic flux after the increase excitation is pressed stop button TA (27), is made of normal opened contact F1 (12), current-limiting resistance R1 (24), stop button TA (27), coil KM (2) and divides deenergizing.Stop button TA (27) in the above-mentioned control circuit and start button QA (28) replace with the control contact of leakage current pulse relay J L (29), make it to become manually to be controlled to be automatic control.In above-mentioned control circuit, as shown in Figure 4, can also connect a capacitor C (32) after adding a diode V3 (30) preceding the connecing of current-limiting resistance R1 (24), capacitor C (32) is succeeded electrical equipment J (31), relay J (31) connects leakage current pulse relay J L (29) contact, make the The whole control circuit become power failure (decompression) release type automatically: contactor is in service in work, capacitor C (32) is in charging, the capacitive energy of contain abundance, when power supply has a power failure (decompression), capacitor C (32) voltage descends gradually, and relay J (31) discharges, and relay J (31) is in the J1 position, capacitor C (32) discharges to coil KM (2), iron core (1) loss of excitation, contactor discharges, and has the automatic release function of dead electricity.

Claims (3)

1, a kind of self-sustaining energy-saving alternating current contactor, comprise iron core (1), coil KM (2), base (3), armature (4), touch spring (5), fixed contact (6), moving contact (7), arc-extinguish chamber (8), contact supporting (9), auxiliary contact group (10) and control circuit, it is characterized in that:

(1) described iron core (1) is made by soft magnetic material;

(2) the contact supporter in the described auxiliary contact group (10) disconnects and is divided into upper contact head support (18) and following contact support (23), upper contact head is supported to be fixed with magnetic conductive board (21) under (18), upper contact head is supported to connect with attachment screw (22) between (18) and the following contact support (23), following contact support (23) upper end cover connects screw (22) certain up and down distance, place two blocks of ferromagnetism magnet (20) in the body (11) symmetrically, be on the magnetic conductive board (21) ferromagnetism magnet (20) adhesive magnetic conductive board (21) when contactor is not worked;

(3) described control circuit; Press start button QA (28), constitute the connection loop by normally closed contact F2 (15), diode V1 (25), start button QA (28), coil KM (2) gets electric excitation, diode V2 (26) is that coil KM (2) constitutes a loop when the power-half cycle, press stop button TA (27), constitute by normal opened contact F1 (12), current-limiting resistance R1 (24), stop button TA (27), coil KM (2) and divide deenergizing.

2, a kind of self-sustaining energy-saving alternating current contactor according to claim 1 is characterized in that: can also replace stop button TA (27) and start button QA (28) with leakage current pulse relay J L (29) in the described control circuit.

3, a kind of self-sustaining energy-saving alternating current contactor according to claim 1 and 2, it is characterized in that: in the described control circuit can also current-limiting resistance R1 (24) preceding connect a diode V3 (30), after connect a capacitor C (32), capacitor C (32) is succeeded electrical equipment J (31), and relay J (31) connects leakage current pulse relay J L (29) contact.

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