CN2161978Y

CN2161978Y - Contactor

Info

Publication number: CN2161978Y
Application number: CN93203958U
Authority: CN
Inventors: 潘兆进; 潘禹伟
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-02-19
Filing date: 1993-02-19
Publication date: 1994-04-13
Anticipated expiration: 2003-02-19
Also published as: WO1994019818A1

Abstract

The utility model discloses a three-step new contactor, which is composed of two groups of fixed contact pieces, movable contact pieces and a button. The utility model is characterized in that two groups of button contact tips have unequal distances with the corresponding contact pieces in order to start the button to firstly switch on a motor to start a circuit, and then, an operating circuit is switched on. Thus, the utility model can not only cause the motor to be started successfully, but also prevent the burnout of the motor caused by faults of overcurrent and open phrase in the operating process of the motor.

Description

Contactor

The utility model relates to a kind ofly to be made single-phase and/or three phase electric machine is starting and the contact-making switch with overcurrent and open-phase protection function in service.

Small-power is single-phase; three phase electric machine is general to adopt one the two poles of the earth or three-pole knife switch are directly started operation; when overcurrent or open-phase fault take place in motor in running; the fuse of knife switch is difficult for fusing; cause burn-down of electric motor; No. 91213051.2 utility model patents of China disclose a kind of doubly-linked knife switch that motor is had overcurrent or open-phase protection function for this reason; but because the contact point of knife switch is a folder cutter formula; frictional force is big during switch; easy to wear; easily burn till breach; be not durable; the doubly-linked knife switch operates also cumbersome, is difficult for forming automatic brake hop device with the relay logotype, thereby still not ideal enough.

Task of the present utility model be to design a kind of easy to operate, more durable in use, have the electric motor protecting function startup, to start operation, three steps of operation uninterrupted continuously to the three-wave-length new type contactor (switch) of motor power supply.

Task of the present utility model is finished like this: the insulator foot of contactor is provided with two groups of flexible compressible power supply contacts (starting fixed touching plate and operation fixed touching plate), starting the startup movable contact spring that has band elasticity to move up and down above the fixed touching plate, the operation movable contact spring that above the operation fixed touching plate, has band elasticity to move up and down, above starting movable contact spring, start button is arranged, above the operation movable contact spring, the operation button is arranged, the distance of the contact fixed touching plate corresponding with it of two groups of buttons does not wait, the pusher dog that drives another group operation button down motion is arranged on one group of start button of close together, have in the side of operation button prevent its upspring automatically and can with the lock pawl of relay interlock.

Every group of fixed touching plate can have a slice (when being used for monophase machine), two (when being used for monophase machine) or three (when being used for three phase electric machine) also can be arranged, correspondingly, every group of kinetic energy sheet also can have a slice, two or three, and every group of button also has one, two or three contacts.Preferably with in two groups of fixed touching plates with start button corresponding one group make than with the operation the corresponding one group of height of button (with respect to insulator foot), and the contact of start button with the operation button contact be contour.When pressing start button, its pusher dog drives the operation button and moves downward simultaneously, because the contact movable contact spring corresponding of start button with it, the close together of fixed touching plate, and startup group movable contact spring is contacted earlier with fixed touching plate, another group movable contact spring does not contact as yet with fixed touching plate, so being connected to the start-up circuit and the motor connection of thick fuse powers to motor, though at this moment the starting current of motor more can not make fuse opening more yet, motor is started smoothly, then when button again when pressing down, also enter contact condition with corresponding that group movable contact spring of operation button and fixed touching plate, also connect so be connected to motor than the operation circuit of fuse, motor is powered, loosen button then, start button lifts under the effect of return spring, make with its corresponding startup group movable contact spring and separate with fixed touching plate, and the operation button is owing to pinned and can't lift by the lock pawl of its side, operation group movable contact spring corresponding with it and fixed touching plate still keep in touch state, at this moment, the start-up circuit that is connected to thick fuse separates with motor, only be connected to than the operation circuit and the motor of fuse and connect, motor is run well the motor power supply.When faults such as generation overcurrent or phase shortage, the fuse opening when electric current surpasses permissible value in the motor windings in the operation circuit makes motor separate with power supply circuits, and motor obtains protection.Desire to make motor out of service, can push the lock pawl aside, the operation button is upspring, and operation group movable contact spring relative with it and fixed touching plate disengaging get final product by touching.Also can lock pawl and relay interlock install, when motor generation overcurrent, phase shortage, overload, fault such as under-voltage, the actuating of relay pushes that lock pawl or the automatic trip of control A.C. contactor, control bell ring are reported to the police aside, recorder broadcast alarm etc., realizes efficiently protecting.

Because the utility model is a button-type contact formula switch; thereby easy-to-operate; durable in use; realize the automatic trip warning easily, solid to the protection of motor, can make motor change operation over to by startup without interruption; avoid the impact of starting current to the operation fuse; and simple in structure, the processing and fabricating cost is lower, is the renewal product that welcome by the motor user.

Describe below in conjunction with embodiment and accompanying drawing.

Fig. 1 is contour according to a kind of two groups of button contacts of the utility model design, and the not contour and every group of fixed touching plate of two groups of fixed touching plates has the longitudinal profile schematic diagram of the three-wave-length contactor of three contacts, and Fig. 2 is the cross-sectional schematic along Figure 1A-A face.

With reference to accompanying drawing, on insulator foot 1, be vertically arranged with one group (along laterally have three) and start fixed touching plate 2, one group of (three) operation fixed touching plate 3, these two groups of fixed touching plates form the power supply fork, above starting fixed touching plate 2, there are one group (three) to start movable contact spring 4, one group (three) operation movable contact spring 5 is arranged above operation fixed touching plate 3, and they are affixed by the flexible member 21,31,41,51 and the insulator foot 1 of conduction respectively.Above starting movable contact spring 4 start button 6 is arranged, there is one group of (three) contact 61 its underpart.Operation button 7 is arranged above operation movable contact spring 5, and there is one group of (three) contact 71 its underpart.Start button 6 and operation button 7 can slide up and down along the cover frame 8 of insulation.Spring 9 can force button upwards to rise.On start button 6, also pusher dog 10 can be set, descending to dial tape running button 7.Be provided with lock pawl 11 in the side of operation button 7, on the operation button 7 seam 72 arranged, lock pawl 11 can snap in the seam 72, stops operation button 7 to rise.The other end at the flexible member 21,31,41,51 that links to each other with fixed touching plate or movable contact spring has binding post 22,32,42,52, for the usefulness that is connected with corresponding circuit.Above-mentioned conducting element covers by insulating cover frame and base, only exposes the head 111 of button and lock pawl 11, so that handle.

For the small machine of power below 10 kilowatts, the binding post 42 that starts movable contact spring 4 can link to each other with motor windings by thicker startup fuse.For the big motor more than 10 kilowatts, the binding post 42 that starts movable contact spring 4 can pass through auxiliary actuating apparatus (as reduced voltage starter or star triangle start device) and link to each other with motor windings, and the binding post 52 of operation movable contact spring 5 is connected with thinner operation fuse, and startup fixed touching plate 2 and the binding post 22,32 that moves fixed touching plate 3 all are connected with power supply and get final product.Press start button 6, it is descending together that its pusher dog 10 drives operation button 7, startup movable contact spring 4 is contacted earlier with startup fixed touching plate 2, moving movable contact spring 5 then contacts with operation fixed touching plate 3 again, source current is earlier through binding post 22, flexible member 21, start fixed touching plate 2, start movable contact spring 4, flexible member 4 and binding post 42, starting fuse delivers in the motor windings, source current (shunting) is again through flexible member 31 then, and operation fixed touching plate 3 moves movable contact spring 5, flexible member 51, binding post 52 and operation fuse are delivered in the motor windings, after the electric motor starting impulse current, unclamp start button 6, under the effect of spring 9, start button 6 rises, and start movable contact spring 4 and separate with startup fixed touching plate 2, but the seam 72 of operation button 7 is blocked by lock pawls 11, operation button 7 can't rise, operation movable contact spring 5 continues to keep in touch with operation fixed touching plate 3, and source current is only sent in the motor through the operation fuse, and motor is run well.When faults such as motor generation overcurrent, phase shortage, the operation fuse blows immediately, and motor obtains protection.When motor normally moves, stir the head 111 of lock pawl 11, lock pawl 11 is withdrawed from from seam 72, operation button 7 rises, and operation movable contact spring 5 separates with operation fixed touching plate 3, and the motor outage stops.

Claims

1, a kind of contactor, on its insulator foot (1), be vertically arranged with flexible compressible one group and start fixed touching plate (2), one group of operation fixed touching plate (3) and the one group startup movable contact spring (4) corresponding with them, one group of operation movable contact spring (5), the start button (6) and the operation button (7) that respectively have one group of contact are housed on insulating cover frame (8), it is characterized in that: startup fixed touching plate (2) is connected with the conductive elastic component (31) of operation fixed touching plate (3) by the flexible member (21) that conducts electricity and is fixed on the insulator foot (1), the startup movable contact spring (4) that is fixed on the insulator foot (1) by the flexible member (41) that conducts electricity is positioned at the top that starts fixed touching plate (2), the operation movable contact spring (5) that is fixed on the insulator foot (1) by conductive elastic component (51) is positioned at the top of moving fixed touching plate (3), top has pusher dog (10) bottom and has the start button (6) of contact (61) and operation button (7) that the side has seam (72) and lay respectively at and start above movable contact spring (4) and the operation movable contact spring (5), they can slide up and down along insulating cover frame (8), spring (9) upwards rises them, the contact of start button (61) is shorter to the distance of operation fixed touching plate (3) than the contact (71) of operation button to the distance that starts fixed touching plate (2), on the other insulating cover frame (8) of seam (72) side the lock pawl (11) that can snap in seam (72) is housed also.

2, by the described contactor of claim 1, it is characterized in that: start the position height of fixed touching plate (2), and the contact (71) of contact of start button (61) and operation button is contour than operation fixed touching plate (3).

3, by claim 1 or 2 described contactors, it is characterized in that: every group starts fixed touching plate and every group of operation fixed touching plate, every group of quantity that starts movable contact spring, every group of operation movable contact spring, start button contact and operation button contact is corresponding, or be a slice (individual), or be two (individual) or be three (individual).