CN2137834Y

CN2137834Y - Multi-function protection device for electric motor

Info

Publication number: CN2137834Y
Application number: CN 92237064
Authority: CN
Inventors: 安振兴
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-11-17
Filing date: 1992-11-17
Publication date: 1993-07-07
Anticipated expiration: 2002-11-17

Abstract

The utility model belongs to a protector for power electric appliances. A base is provided with three relays. Relay windings are three-phase electric channels. The dead and the tail ends of each winding are connected with contact points on the base. Insulating rods are laterally arranged below the relays, and are connected with the lower ends of relay armatures. The insulating rods are connected with control contact points. Each phase makes relays work through overload, short circuit and excess voltage, and pushes down lateral insulating rods to make the control contact points open. A three-phase electric open circuit protects motors. The utility model has the advantages of simple structure, convenient installation and operation, and low cost, and is suitable for various industrial motors.

Description

Multi-function protection device for electric motor

The utility model belongs to the power Protector for electric appliances, is specially adapted to move the usefulness of electric motor protecting.

At present in various electric equipments; motor will be main maximum electric equipment; in order to protect the intact of various device; the safety of service meter is most important; for motor is not damaged also is current insoluble problem; current automatic air-break switch and the overload relay of mostly adopting in the motor power supply circuits protected the safety of motor; overload relay is made up of several groups of sheet metals; current overload; contact leaves; its deficiency is that equipment and motor are when breaking down suddenly; electric current is very high, and the sheet metal of overload relay has little time bending, can not draw away contact; motor has burnt out; the shortcoming of automatic air-break switch is that the drop-away current that dispatches from the factory just is transferred to 7～10 times of this equipment, does not have overload protective function, as electric current is reduced; can't afford to drive again and send a car; owing to above reason, it is recurrent thing that the motor operation burns out, and brings very big loss for equipment and production.

For solving above deficiency; the purpose of this utility model provides a kind of multi-functional electric motor protecting device, adopts in the three-phase circuit wherein an overload mutually, short circuit or open circuit and other phase current increases; transmission by connecting rod is cut off the electricity supply, and effectively protects the security of operation of motor.

It is an insulator foot (as shown in Figure 1) that structural design of the present utility model is achieved in that below the protector, the input and output contact of three-phase electricity is housed on base, each is equipped with a relay (as shown in Figure 2) in two contacts mutually in three-phase electricity, the relay winding is the three-phase electricity path, the relay winding wire diameter size and the number of turn are decided by output motor power, the two ends and the input and output contact of each winding join, below three relays, an insulating bar is housed laterally, three projections are arranged in the insulating bar side, every projection is just corresponding to the lower end of the armature of relay, corresponding opposite side with projection also has a projection in the termination of insulating bar, be connected with control contact pole, utilizing insulating bar is that axle can be done a little rotation of clockwise direction with the center; One manual button is housed in three relay sides of base; one normal opened contact is housed below the button; button is pressed junction closure; the normally closed contact (as shown in Figure 3) in parallel of this contact and relay control; its course of work: the winding of three relays is the three-phase electricity path; wherein any one transships mutually; overvoltage; short circuit; this relay adhesive; wherein one opens circuit mutually; other phase current increase also can make its repeat circuit adhesive; armature of relay lower end directly heads on insulating bar; insulating bar is around axle deflection; by lateral projections and control contact pole; contact is disconnected; that phase adhesive all makes the control contact disconnect; the control contact is serially connected in the control circuit of air switch, big electric current in order to prevent to start, the relay adhesive of little electric current during operation; controlling on the contact and connecing a manual button; button is pressed junction closure, with the short circuit of above-mentioned control contact, though the relay adhesive; contact is also moving; but inoperative, it is working properly to start the little electric current operation in back, the running current overrate; promptly speed is jumped and is drawn back power supply, the effective like this safe operation of protecting motor.

The advantage of the utility model: simple in structure, cost is low, easy to install, be adapted at installing and using in the various industrial motor circuit.

Detailed structure of the present utility model is provided by following examples and accompanying drawing.

Fig. 1 is a multi-functional electric motor protecting device shape assumption diagram;

Fig. 2 is a multi-functional electric motor protecting device A-A cutaway view;

Fig. 3 is a multi-functional electric motor protecting device circuit connection diagram.

Its structure is known that by Fig. 1-3 (1) is the protector base; (2) be input; (3) be output; (4) be hand push button; (5) be relay, three side by side, in every phase path one, (6) are return spring in its repeat circuit (5), and (7) are the armature iron core; (9) be armature coil, (8) are the armature termination, and joining with the armature termination is insulating bar (10), and insulating bar (10) both sides are projection.Join with armature on one side, the other end joins with control contact pole (11), and (12) are contact, are normally closed contact, be serially connected in the control circuit of air switch, (13) be insulating bar (10) fulcrum, (4) are hand push button, are normal opened contact below, button is pressed, junction closure, this contact is in parallel with the control contact, and it connects as shown in Figure 3.

Claims

1, a kind of multi-functional electric motor protecting device; it is characterized in that below the protector be a base (1); the input and output contact (2) (3) of three-phase electricity is housed on base; one relay (5) is housed in three-phase electricity two contacts of every phase (2) (3); the relay winding is the three-phase electricity path; the two ends and the input and output point of each winding of relay (5) join, and an insulating bar (10) laterally is housed below three relays (5), and insulating bar (10) joins with control contact pole (11).

2, by the described protector of claim 1; there are three projections the side that it is characterized in that the insulating bar (10) that relay (5) is following; every projection is just corresponding to the lower end (8) of the armature of relay; corresponding opposite side with projection also has a projection in the termination of insulating bar (10), is connected with control contact pole (11).

3, by the described protector of claim 1, it is characterized in that one manual button (4) being housed in (1) three relay side of base, a normal opened contact is housed below the button, it is in parallel that this contact and relay are controlled contact (12).