CN2341268Y - Contactor - Google Patents

Abstract

The utility model discloses a contactor. The utility model is characterized in that two sets of coils with different turn numbers are wound on a solenoid frame in a contactor body; a rectifying circuit and an over-voltage absorbing mechanism are arranged inside a side-installed attachment, wherein, the input end of the rectifying circuit is connected with a controlled voltage source and the output end of the rectifying circuit is connected in parallel with the over-voltage absorbing mechanism; a large power starting coil is connected in series with a small power holding coil, then connected in parallel with both ends of the over-voltage absorbing mechanism; both ends of the small power holding coil are connected in parallel with a normally closed contact. The utility model has the advantages of wide range of rated voltage, AC / DC universality, reliable work and no noise.

Description

Contactor

The utility model relates to a kind of low-voltage electrical apparatus, be particularly useful for the voltage ripple of power network scope bigger and to the contactor under the high reliability request operating mode of element operating state.

Chinese patent specification (patent No. 95227005.6) discloses a kind of energy-conservation double winding A.C. contactor, it compare with the common A.C. contactor of market sale have safe and reliable to operation, noise is little, advantages such as power consumption is low, but because its electromagnetic system is an AC excitation, be subjected to the influence of electromagnetic attraction zero passage, coil keeps power high relatively, the broadening of rated operational voltage upper limit permissible value is very limited, and there is work noise, hand over, direct-current control voltage can not be general, special industry when therefore still being difficult to satisfy power network fluctuation, special system is to the vast rural area of high reliability request and China and the actual needs from far-off regions (fluctuation range of these area power grid voltages is bigger) of element operating state.

Task of the present utility model provides a kind of owing to rated operational voltage wide ranges, the general contactor of AC/DC control voltage.

In order to solve above-mentioned task, solution of the present utility model is: the coil of two groups of different numbers of turn of coiling on the line bag framework of contactor, both high-power actuating coil and small-power hold-in winding, normally closed interlock, in side dress annex, rectification circuit and overvoltage absorption plant are set, the input of rectification circuit joins with control voltage, rectification circuit output end and overvoltage absorption plant are in parallel, be connected in parallel on overvoltage absorption plant two ends behind the high-power actuating coil series connection small-power hold-in winding, small-power hold-in winding two ends and normally closed interlock are in parallel.

Owing in side dress annex, rectification circuit is set in the above-mentioned solution, be the characteristics of utilizing electromagnetic system release voltage when DC excitation extremely low (it is extremely low to keep the required ampere-turn of reliable attracting state) of the contactor that exchanges control, improve release voltage by reducing hold-in winding power (exceeding) greatly, and reach the purpose that improves its rated operational voltage upper limit permissible value to keep reliable adhesive.Simultaneously, make the purpose that its electromagnetic system also can adhesive under low voltage by improving actuating coil power, reaching.Therefore, the utlity model has very wide operating voltage allowed band and the general advantage of coil control circuit AC/DC.Owing to when electromagnetism is about to closure, seal in the small-power hold-in winding, make the continuation effect adhesive after electromagnet dependence kinetic energy and starting, hold-in winding are connected, thereby reduced the dynamic and static impact that produces when unshakable in one's determination closed greatly, therefore also improved mechanical endurance of the present utility model.With the normal working voltage of the energy-conservation double winding A.C. contactor of prior art is that the 75%-125% of rated value compares, normal working voltage scope of the present utility model can reach rated value ± more than 35%.Secondly, the maintenance power of the energy-conservation double winding A.C. contactor of its 20A specification is 4W, and the maintenance power of the contactor of the utility model 65A specification only is 4W.The utility model also has electromagnetic system and keeps power low thus, and the noiseless again advantage of reliable operation.

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is the circuit theory diagrams of the utility model execution mode;

Fig. 2 is another circuit theory diagrams that belong to execution mode shown in Figure 1;

Fig. 3 is the vertical view of execution mode contactor illustrated in figures 1 and 2.

In circuit theory diagrams shown in Figure 1, two groups of different coils of coiling on the line bag framework of contactor, it is divided into high-power actuating coil 1 and small-power hold-in winding 2, be connected in parallel on overvoltage absorption plant 4 two ends behind the high-power actuating coil 1 series connection small-power hold-in winding 2, overvoltage absorption plant 4 general piezo-resistance, the induction high pressure that produce when being used to restrain DC control of adopting.Overvoltage absorption plant 4 two ends also join with the output of rectification circuit 5, and rectification circuit 5 can be bridge rectifier, and the input of rectification circuit 5 joins with control voltage U C.Small-power hold-in winding 2 two ends and normally closed interlock 3 are in parallel.Its normally closed interlock 3 is generally auxiliary contact.When control voltage U C connects, electromagnetic system of the present utility model adhesive under the effect of high-power actuating coil 1; When the dynamic and static iron core of electromagnet was about to closure, the normally closed interlock 3 of electromagnet interlock was opened, and electromagnet relies on the continuation effect adhesive after kinetic energy and starting, hold-in winding are connected also to remain on attracting state.Circuit theory diagrams shown in Figure 2 and Fig. 1 are basic identical, and the small-power hold-in winding 2 that difference is is connected in parallel on overvoltage absorption plant 4 two ends, and high-power actuating coil 1 series connection normally closed interlock 3 backs are in parallel with small-power hold-in winding 2.On principle, Fig. 1 and Fig. 2 role are identical, are the contactor that circuit theory shown in Figure 1 is applicable to big current specification, and circuit theory shown in Figure 2 is applicable to little current specification contactor.As shown in Figure 3, CJX4 type contactor is in contactor main body 6 one sides side dress annex 8 to be arranged, and opposite side has auxiliary contact.The coil of two groups of different numbers of turn of coiling on the line bag framework of dress in this contactor main body 6, high-power actuating coil 1 and small-power hold-in winding 2.To other model contactors, when different coil control voltage and power, the parameter of selected high-power actuating coil 1 and small-power hold-in winding 2 can be with reference to following routine parameter designing.For example when coil control voltage be 220 volts, during 50HZ, the parameter designing of high-power actuating coil 1 and small-power hold-in winding 2 is as follows, high-power actuating coil 1 φ 0.21mm, 1800 circles; Small-power hold-in winding 2 φ 0.05mm, 11500 circles.Rectification circuit 5 and overvoltage absorption plant 4 are to place side dress annex 8, and normally closed interlock 3 is auxiliary contacts of a side, and the electrical connection between them can be connected by lead.Execution mode described in the utility model is basic identical with above-mentioned form in 3TB or Type B, CJO type contactor, just rectification circuit 5 and overvoltage absorption plant 4 is loaded in its corresponding plug-in annex.The utility model is in order to improve the upper limit permissible value of rated operational voltage greatly, usually can take two kinds of measures: 1, reduce opening of normally closed interlock 3 in the utility model as far as possible apart from (exceeding) and the little electromagnetic material of employing magnetic resistance to be enough to the disjunction starting current, reduce hold-in winding power greatly to reach, improve the purpose of rated operational voltage upper limit permissible value; 2, adopt the higher enamelled wire of work temperature rise permissible value.The utility model is not only applicable to contactor, is applicable to auxiliary relay yet, as long as adopted above-mentioned rectification circuit DC excitation to reach the yet genus protection range of the present utility model of wide operating voltage range.

Claims (2)

1, a kind of contactor, it comprises the contactor main body, the coil of two groups of different numbers of turn of coiling on side dress annex, normally closed interlock, the line bag framework in the contactor main body, both high-power actuating coil and small-power hold-in winding, it is characterized in that: also be included in the rectification circuit (5) and the overvoltage absorption plant (4) that are provided with in the side dress annex, the input of rectification circuit (5) and control voltage (U _C) join, the output of rectification circuit (5) and overvoltage absorption plant (4) are in parallel, be connected in parallel on overvoltage absorption plant (4) two ends behind high-power actuating coil (1) the series connection small-power hold-in winding (2), small-power hold-in winding (2) is in parallel with normally closed interlock (3).

2, contactor according to claim 1 is characterized in that: described small-power hold-in winding (2) is connected in parallel on overvoltage absorption plant (4) two ends, and high-power actuating coil (1) series connection normally closed interlock (3) back is in parallel with small-power hold-in winding (2).

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