CN2314464Y

CN2314464Y - Contactor with self controlling switch

Info

Publication number: CN2314464Y
Application number: CN 97243419
Authority: CN
Inventors: 刘勇
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-10-24
Filing date: 1997-10-24
Publication date: 1999-04-14
Anticipated expiration: 2007-10-24

Abstract

The utility model relates to a contactor with a self controlling switch. An alternating current contactor is composed of an armature iron, a yoke iron, a coil and a lower base seat. The basal body of the alternating current contactor is additionally provided with a self controlling switch device which is composed of a shell body, a push rod, a push rod reaction spring, a static contact, a moving contact bridge, a pressure reducing circuit, a rectifying circuit and an over-voltage absorbing circuit. The electromagnetic system of the utility model is the high-voltage starting and low-voltage maintaining. The utility model has over-voltage protection when the coil is switched off, which causes the operation of the utility model to be reliable. The utility model can operate under the conditions of lower network voltage and higher environmental temperature.

Description

Contactor with autocontrol switch

The utility model relates to a kind of low-voltage electrical apparatus switch, particularly a kind of contactor with autocontrol switch.

Traditional alternating current operation contactor long-term work is under the 85-110% rated voltage, and the coil working temperature rise is higher, generally can only work in the environment below+55 ℃.Networking voltage is lower than 80% and just is difficult to guarantee reliable adhesive, and particularly existing A.C. contactor mostly is not with overvoltage to absorb, and can produce overvoltage when coil blackout, makes coil insulation vulnerable.Mass-produced at home at present contactor design mostly in the seventies to the mid-80, international standard IEC158 does not also consider the load of AC-8b compressor operating, so it is less to touch bridge thermal capacity, be difficult to adapt to the place that networking voltage is on the low side, ambient temperature is higher.

Deficiency at above-mentioned prior art existence, the purpose of this utility model provides a kind of contactor that reaches energy reliably working under the ambient temperature conditions of higher in the voltage ripple of power network scope more greatly, contact system can satisfy AC-8b compressor load condition of work, and coil can not burn.

The purpose of this utility model is achieved in that it comprises by armature, yoke, coil, the A.C. contactor matrix that bottom base constitutes, it is characterized in that: be provided with by housing in above-mentioned bottom base one side, push rod, the push rod reaction spring, fixed contact, movable contact bridge and reduction voltage circuit, rectification circuit, overvoltage absorbs the autocontrol switch device that circuit constitutes, push rod be inserted in housing with notch in, the push rod reaction spring places the lower end of push rod, the top of push rod is provided with the depression bar that is fixed on the armature, place movable contact bridge and the normally-closed contact J that is fixed on a pair of fixed contact formation autocontrol switch on the housing on the push rod, by electric capacity, the reduction voltage circuit that resistance constitutes and the normally-closed contact J of autocontrol switch are in parallel, be connected in the rectification circuit input end that constitutes by diode D1-D4, the output of rectification circuit links to each other with contactor coil CJ, by the diode D3 in the rectification circuit, D2 constitutes overvoltage and absorbs circuit, is parallel to coil CJ two ends.Line voltage gets contactor coil CJ by the normally-closed contact J and the rectification circuit of autocontrol switch, armature is inhaled to yoke then, depression bar on the armature presses push rod to bottom offset, normally-closed contact J is opened, and line voltage is given very low voltage of rectification circuit after the reduction voltage circuit step-down, make armature maintain attracting state, when contactor breaks away from electrical network, coil CJ produces back-emf, absorbs circuit by overvoltage, effectively suppresses superpotential generation.

The utility model is owing to increased the autocontrol switch device; the electromagnetic system that makes contactor is that high voltage startup, low pressure keep; improved the functional reliability of electromagnetic system greatly; effectively protected coil insulation to preserve from; at the same time; touch the thermal capacity of the copper and the contact of bridge in increase, make reliably working under the condition that the utility model fully can be on the low side at network voltage, ambient temperature is higher.

Below in conjunction with accompanying drawing the utility model is explained.

Fig. 1 is the whole schematic diagram of dissecting of the present utility model.

Fig. 2 is an autocontrol switch apparatus structure schematic diagram.

Fig. 3 is the utility model circuit theory diagrams.

By accompanying drawing as can be known, the utility model mainly is to have increased the autocontrol switch device that is made of housing 6, push rod 9, push rod reaction spring 11, fixed contact 7, movable contact bridge 8 and resistance 13 (R), electric capacity 12 (C), diode 14 (D1-D4) on the A.C. contactor matrix that is made of armature 1, bottom base 3, yoke 4, coil 5 (CJ).Housing 6 is connected as a single entity with bottom base 3, push rod 9 be inserted in housing 6 with notch in, push rod reaction spring 11 places the lower end of push rod 9, movable contact bridge 8 places on the push rod 9, moves up and down with push rod 9.Above push rod 9, be provided with the depression bar 2 that is connected with armature 1, be that push rod 9 is when armature and yoke adhesive, move down with depression bar 2, movable contact bridge 8 and a pair of fixed contact 7 constitute the normally-closed contact J of autocontrol switch, this normally-closed contact J with by resistance R, the reduction voltage circuit that capacitor C constitutes is in parallel, diode D1-D4 constitutes full-wave rectifying circuit, CJ provides direct current for contactor coil, when starting contactor, line voltage gives coil CJ excitatory by normally-closed contact J and rectification circuit, coil CJ get electric after, armature 1 and yoke 4 adhesives, and drive push rods 9 by depression bar 2 and move down, make movable contact bridge 8 break away from fixed contact 7, be that normally-closed contact J disconnects, this moment, line voltage passed through by capacitor C, the reduction voltage circuit that resistance R constitutes makes armature Wei Te in the attracted position for rectification circuit provides a very low voltage.When contactor coil CJ dead electricity, coil CJ produces back-emf, and the overvoltage that is made of diode D3, D2 absorbs circuit turn-on work, the superpotential generation of the inhibition that is effective, and protection coil insulation preserves from.After the coil CJ outage, armature returns initial position, and push rod 9 sets back under the effect of push rod reaction spring 11, makes movable contact bridge 8 and fixed contact 7 closures, and promptly normally-closed contact J connects, and a discharge loop is provided for capacitor C, resistance R.Sequence number 10 among the figure is the contact buffer spring, and sequence number 15 is a printed substrate.

Claims

1, a kind of contactor with autocontrol switch, it comprises by armature, yoke, coil, the A.C. contactor matrix that bottom base constitutes, it is characterized in that: be provided with by housing in above-mentioned bottom base one side, push rod, the push rod reaction spring, fixed contact, movable contact bridge and reduction voltage circuit, rectification circuit, overvoltage absorbs the autocontrol switch device that circuit constitutes, push rod be inserted in housing with notch in, the push rod reaction spring places the lower end of push rod, the top of push rod is provided with the depression bar that is fixed on the armature, place movable contact bridge and the normal contact J that is fixed on a pair of fixed contact formation autocontrol switch on the housing on the push rod, by electric capacity, the reduction voltage circuit that resistance constitutes and the normally-closed contact J of autocontrol switch are in parallel, be connected in the rectification circuit input end that constitutes by diode D1-D4, the output of rectification circuit links to each other with contactor coil CJ, by the diode D3 in the rectification circuit, D2 constitutes overvoltage and absorbs circuit, is parallel to coil CJ two ends.