CN2483827Y

CN2483827Y - Latching energy-saving AC contactor whith is autocut-off when power is interrupted

Info

Publication number: CN2483827Y
Application number: CN 01205239
Authority: CN
Inventors: 林李杰; 林李忠; 林李东
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-02-11
Filing date: 2001-02-11
Publication date: 2002-03-27
Anticipated expiration: 2011-02-11

Abstract

A self-holding energy saving power failure automatic releasing type AC contactor comprises an iron core, a reset spring, a control coil, a control contact and a control circuit. The iron core is made of half-hard magnetic steel and divided into an upper iron core and a lower iron core. When the electricity power is supplied normally, the contactor is pulled in by DC excitation. When the electricity power has some failure, an energy storage capacitor C1 in the control circuit provides reverse DC demagnetization current to remove the remanence of the lower iron core, thus the upper iron core can separate under the effect of the reset spring and drive the main contact of the contactor to disconnect, so the main circuit power supply disconnection action is completed and the power failure automatic releasing purpose is achieved.

Description

The automatic release type A.C. contactor of the energy-saving power failure of self-sustaining

The utility model relates to a kind of A.C. contactor, refers in particular to the automatic release type A.C. contactor of the energy-saving power failure of self-sustaining.

Chinese patent once disclosed a kind of " self-closing electromagnetic contactor " (ZL85100193 stops), was characterized in that iron core and armature all are to adopt semi-hard magnetic material to make." self-sustaining energy-saving contactor " (ZL87215662 stops), its main feature are that a steel ball is arranged in the self-sustaining fixed head.The applicant once designed a kind of " self-sustaining energy-saving alternating current contactor " (ZL99202497), its main feature is that the disconnection of contact supporter is divided into upper contact head support and following contact support in the auxiliary contact group, between place ferromagnetism magnet and magnetic conductive board, and there is a control circuit to constitute connection loop and branch deenergizing, compare ratio of performance to price height with chain coupling type contactor.

Task of the present utility model provides the automatic release type A.C. contactor of the energy-saving power failure of a kind of self-sustaining, and it has remarkable advantages such as energy-conservation, anti lightning and overvoltage impact.

For finishing above-mentioned task, the solution that the utility model is taked is: the automatic release type A.C. contactor of the energy-saving power failure of a kind of self-sustaining, comprise iron core, back-moving spring, control coil, the control contact, the control circuit (see figure 1), iron core is made with the semihard magnet steel, iron core divides upper core and lower core, DC excitation, it is characterized in that, in control circuit, resistance R V is connected across power input A1, A2, power input A1 one tunnel connects and often opens control contact F1, leakage current pulse relay J L1 is received on another road, the leakage current pulse relay J L1 other end one tunnel connects normally closed control contact F2 one end, another road connects rectification circuit, the center-side of control coil KM one termination control relay J contact, the normally closed control contact F2 other end connects the J2 contact of control relay J contact by diode D2 one tunnel, another road meets diode D3, the other end of often opening control contact F1 by diode D1 and resistance R one road to capacitor C 1, another road is to the J1 contact of control relay J contact, the rectification circuit other end, the diode D3 other end, capacitor C 1 other end, another termination power input of control coil KM A2.

The utility model is owing to adopt semihard magnet steel iron core, under DC excitation, and the contactor adhesive.After disconnecting exciting current, iron core still remains on the attracted position because of remanent magnetism.When with anti-phase direct current degaussing, iron core is because of remanence disappearance, and contactor discharges automatically.This design has reached energy-conservation purpose.

AC power 220V is from power input A1, A2 input, and it is for anti lightning and superpotential impact that power input A1, A2 end span are connected to piezo-resistance RV.The operation principle of control circuit is: as power input A1, when A2 has AC220V voltage, L1 is in closure state because of the leakage current pulse relay J, make control relay J get electric adhesive, the contactor control coil KM that is connected on control relay J contact center-side is connected on the J2 contact of control relay J contact, starting current is by normally closed control contact F2, rectifier diode D2, contactor control coil KM is arrived to power input A2 in the J2 contact of control relay J contact, form the loop, contactor control coil KM gets, lower core produces powerful magnetic force, makes the upper core adhesive.Because the displacement during the upper core adhesive makes normally closed control contact F2 be opened by normally closed often becoming, and has cut off starting current.Often open control contact F1 and then become normally closedly, and give storage capacitor C1 charging by rectifier diode D1, current-limiting resistance R by often opening.Finished the main noddle on contactor closure like this, turn-on action.Behind power input A1, A2 end AC220V dump, control relay J does not make the contactor control coil KM that is connected on its center-side be transformed into the J1 contact of control relay J contact by the J2 contact of control relay J contact because of coil has electricity, provide reverse direct current demagnetizing current by storage capacitor C1, make the lower core remanence disappearance, upper core separates under the effect of back-moving spring, and drive main noddle on contactor disjunction, finish the action of cutting off main circuit power like this, reached the purpose that has a power failure and discharge automatically.

Below in conjunction with embodiment and accompanying drawing thereof the utility model is remake description.

Fig. 1 is the control circuit electrical schematic diagram of present embodiment.

Present embodiment comprises iron core, back-moving spring, control coil, the control contact, the control circuit (see figure 1), iron core is made with the semihard magnet steel, iron core divides upper core and lower core, DC excitation, it is characterized in that, in control circuit, resistance R V ↓ be connected across power input A ↓ 1, A ↓ 2, power input A ↓ 1 one tunnel connects and often opens control contact F ↓ 1, leakage current pulse relay J L ↓ 1 is received on another road, leakage current pulse relay J L ↓ 1 other end one tunnel connects normally closed control contact F ↓ 2 one ends, another road connects rectification circuit, the center-side of control coil KM ↓ termination control relay J ↓ contact, normally closed control contact F ↓ 2 other ends connect J ↓ 2 contacts of control relay J ↓ contact by diode D ↓ 2 one tunnel, another road connects diode D ↓ 3, the other end of often opening control contact F ↓ 1 by diode D ↓ 1 and resistance R ↓ one road to capacitor C ↓ 1, another road is to J ↓ 1 contact of control relay J ↓ contact, the rectification circuit other end, diode D ↓ 3 other ends, capacitor C ↓ 1 other end, control coil KM ↓ another termination power input A ↓ 2.

As shown in Figure 1, rectification bridge output end cross-over connection diode D ↓ 4 and control relay J ↓, input negative terminal serial connection capacitor C ↓ 2, constitute above-mentioned rectification circuit.

Claims

1, the automatic release type A.C. contactor of the energy-saving power failure of a kind of self-sustaining, comprise iron core, back-moving spring, control coil, the control contact, control circuit, iron core is made with the semihard magnet steel, iron core divides upper core and lower core, DC excitation, it is characterized in that: in control circuit, resistance R V ↓ be connected across power input A ↓ [1], A ↓ [2], power input A ↓ [1] one tunnel connects and often opens control contact F ↓ [1], leakage current pulse relay J L ↓ [1] is received on another road, leakage current pulse relay J L ↓ [1] other end one tunnel connects normally closed control contact F ↓ [2] one ends, another road connects rectification circuit, the center-side of control coil KM ↓ termination control relay J ↓ contact, normally closed control contact F ↓ [2] other end connects J ↓ [2] contact of control relay J ↓ contact by diode D ↓ [2] one tunnel, another road connects diode D ↓ [3], the other end of often opening control contact F ↓ [1] by diode D ↓ [1] and resistance R ↓ one road to capacitor C ↓ [1], another road is to J ↓ [1] contact of control relay J ↓ contact, the rectification circuit other end, diode D ↓ [3] other end, capacitor C ↓ [1] other end, control coil KM ↓ another termination power input A ↓ [2].

2, the automatic release type A.C. contactor of the energy-saving power failure of self-sustaining according to claim 1, it is characterized in that: rectification bridge output end cross-over connection diode D ↓ [4] and control relay J ↓, input negative terminal serial connection capacitor C ↓ [2], constitute described rectification circuit.