CN2274834Y

CN2274834Y - Open phase protecting device for A. C. contact interlocking motor

Info

Publication number: CN2274834Y
Application number: CN 96242074
Authority: CN
Inventors: 王清智
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-10-01
Filing date: 1996-10-01
Publication date: 1998-02-18
Anticipated expiration: 2006-10-01

Abstract

The utility model relates to a phase interruption protective device for motors, which is composed of AC contactors. The utility model comprises a main AC contactor and a secondary AC contactor, the main AC contactor and the secondary AC contactor forms an interlocking holding circuit to perform phase interruption protection towards the motor, and the main AC contactor and the secondary AC contactor are made into an integral mode and can be also made into a split mode. The utility model has the advantages of few elements, simple structure and reliable operation.

Description

A.C. contactor interlocking open-phase protection device for electromotor

The utility model relates to low-voltage electrical apparatus, and mainly is meant a kind of open-phase protection device for electromotor that is made of the A.C. contactor interlock circuit.

Existing motor phase failure protection device, having a kind of is to adopt fuse relay form in parallel, it needs to be connected in parallel on the three-phase fuse respectively with three relays; Also have a kind of employing under current relay form, also need three under current relays to be connected in the three-phase circuit respectively; More general is a kind of; be to utilize residual voltage; set up an artificial neutral point; utilize the deviation of itself and zero potential to control; resistance, electric capacity, the multiple artificial neutral point mode of current transformer are specifically arranged again, and most the need through transistor rectification, amplifying circuit promotes the actuating of relay and realizes protection; this has not only increased complex circuit, and has increased maintenance workload.

Goal of the invention of the present utility model is on former A.C. contactor basis, increases by one and pays A.C. contactor, by the interlock circuit constituent apparatus of the two, realizes that this device element consumption is few to motor open-phase protection, simple structure, and operation is practical reliable.

Embodiment of the present utility model is, A.C. contactor interlocking open-phase protection device for electromotor, comprise, main contactor (1) that constitutes by electromagnetic mechanism (2), contact (3), arc-control device (4) and motor, three phase mains and be connected lead, it is characterized in that, comprise that is also paid an A.C. contactor (6); Main, a pair contactor can be assemblied in the shell (12), perhaps, master, pair separation, perhaps, main, pair contactor is assembled into integral body by grafting, bolt form; Constitute interlock circuit by main contactor (1), pair contactor (6) and normally opened contact (8) thereof.

Description of drawings

Fig. 1, master, pair one A.C. contactor organigram

Fig. 2, master, pair contactor interlock circuit open phase protection control principle figure

Such as Fig. 1, represented that a novel interchange that is made of primary and secondary A.C. contactor connects Tentaculum, main A.C. contactor comprise electromagnetic mechanism, contact and arc-control device three parts, one Pair A.C. contactor capacity of side is little, does not need arc-control device, primary and secondary A.C. contactor peace Be contained in the shell (12), become integral form, also can primary and secondary separate form, namely two A.C. contactor can also be made grafting bolt type of attachment, connects primary and secondary easily Tentaculum is assembled into an integral body, and is easy to use.

As shown in Figure 2, motor D connects A, B, C three phase mains, (1) three of main contactor Normally open contact (3) (being L1 1-3) is serially connected with in major loop A, B, the C three-phase, main contact The coil (5) (being L1) of device (1) connects main contact (3) upper end two-phase by often driving button (10), As, the F termination B phase of coil (5), the E end connects the C phase by button (10) (being K1). Pay and connect Coil (9) (being L2) contact head (3) the lower end two-phase of tentaculum (6), such as A, B two-phase, its The H termination C phase of normally opened contact (8) (being L2 1), (connecing not identical phase with coil), G The normally closed button of termination (11) (being K2), K2 connects the E point, and above-mentioned line has multiple combination, only Want H, F not to be connected on same phase, H and E (by button (10)) must be connected to same mutually namely upper Can, H and the same phase of E palpus as connecing the C phase, are to connect different phase times for avoiding, and cause and open Moving instantaneous short circuit. Its action logic relation is to click start button (K1), main contact Device coil L1 gets electric adhesive, and contact (3) becomes closed by often opening, electric motor starting, simultaneously, Paying contactor coil (L2) must be electric, its normally open contact L2 1 closure, and by normally closed button K2, Make L1 keep adhesive, realize interlocking, when a certain mutually disconnected phase, break mutually such as A, then the L2 dead electricity → L2 1 discharge become often open → L1 dead electricity → main contact (3) discharges to become and often drives motor and stop; If B Mutually disconnected, L1 and L2 be dead electricity simultaneously, and motor stops; If C is mutually disconnected, by C phase → H → L2 1 → G → K2 → E → L1 dead electricity, motor stops, and as above analyzes, and three-phase is appointed and is lacked a phase, and motor is namely Stop, other combinatory analysis is identical. Normal operation needs motor to stop, and presses K2 and gets final product. Reached by figure Above-mentioned analysis as seen, L1 and L2 electric maintenance and dead electricity release are inter-related, so It is primary and secondary contactor interlocking circuit.

Provide a preferred embodiment, squirrel-cage asynchronism alternating current machine D, power 20KW; main contactor is selected rated voltage 380V for use, electric current 40A, coil turn 3600 circles; line is through 0.18mm; paying contactor, to select rated voltage, electric current for use be 380V, 1A, coil turn 12800 circles, and line is through 0.09mm; the two is in a casing; make a novel twin coil A.C. contactor, connect major loop and control loop, constitute a contactor interlocking open phase protection by schematic diagram.

The utility model is on former interchange contact basis, has increased a small-power A.C. contactor, has promptly realized open phase protection effectively, and simple and practical, it is convenient to implement.

Claims

1, A.C. contactor interlocking open-phase protection device for electromotor comprises, main contactor (1) that is made of electromagnetic mechanism (2), contact (3), arc-control device (4) and motor, three phase mains and be connected lead is characterized in that, comprise that is also paid a contactor (6); Main, a pair contactor can be assemblied in the shell (12), perhaps, master, pair separation, perhaps, main, pair contactor is assembled into integral body by grafting, bolt form; Constitute interlock circuit by main contactor (1), pair contactor (6) and normally open contact (8) thereof.

2, according to the described A.C. contactor interlocking of claim 1 open-phase protection device for electromotor, it is characterized in that, described interlock circuit, main contactor coil (5) connects in main contact (3) the upper end two-phase by button (10), and the E end of coil (5) also joins with button (11); Pay contactor coil (9) and connect in main contact (3) the lower end two-phase, another phase of its normally open contact (8) H termination, the G end joins with button (11); The F end of coil (5) is not connected to mutually same with the H end of contact (8); The E end (by button (10)) of coil (5) must connect mutually same with the H end of contact (8).