CN2437068Y

CN2437068Y - Multi-function motor protector

Info

Publication number: CN2437068Y
Application number: CN 00223169
Authority: CN
Inventors: 文正明
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-06-01
Filing date: 2000-06-01
Publication date: 2001-06-27
Anticipated expiration: 2010-06-01

Abstract

The utility model relates to a multifunction motor protector. Through a fuse RD, A phase input is connected to a fixed contact 24 of a contactor JC, normally closed contacts 3, 4 of a leakage protector LD and normally closed contacts 25, 26 of a thermal relay RJ, and are connected to one end 5 of a stop button TA. One path of the other end 6 of the stop button TA is connected with a normally open contact 7 of an under-voltage protector QY, and is connected with one end of a normally open auxiliary contact 8 of a time relay SKC. The other path of the other end 6 of the stop button TA is connected with one end 9 of a starting button QA. One path of the other end 10 of the starting button passes through the coil of the time relay SKC, and is connected with the coil of a contactor JC and a contact 11 through the coil of the under-voltage protector QY and the parallel connection circuit of a fixed value resistor DR. The other path of the SKC coil is connected to B phase input through a fuse RD. The other path of the connection circuit of the QY and the DR is connected to C phase input through the fuse RD. The other path of the end point 10 of the starting button QA is connected with the contacts 12, 13 of JC. The utility model has the protective functions for short circuit, overloading, open phase, under voltage, creepage, sudden power on or power down.

Description

The multi-functional electric motor protecting device

The utility model is relevant with motor protecter.

Existing three-phase motor protector power circuit for once is disconnected.When motor turns round for a long time, big electric current raises its temperature by the contact and bonds together, and loses defencive function and damages motor.The control circuit of motor protecter all is to utilize two-phase to constitute the loop of sucking coil, if third phase falls mutually or fuse blows, sucking coil is work as usual, and power circuit is still connected, and motor forms the two-phase running and burns coil.Existing motor protecter function is few, poor reliability.

The purpose of this utility model provides a kind of simple in structure, and diverse in function is safe and reliable, motor protecter easy to use.

The utility model is achieved in that

The A of multi-functional electric motor protecting device imports mutually through fusing RD device and is connected to the fixed contact 24 of contactor JC and the normally-closed contact 3 of earth leakage protective device LD; 4; the normally-closed contact 25 of thermal relay RJ; be connected to the end 5 of stop button TA after 26; the other end 6 one tunnel of TA connects an end of often driving auxiliary contact 8 that is connected to time relay SKC behind the normally opened contact 7 of under-voltage protection device QY; end points 6 another roads of TA connect the end 9 of start button QA; the other end 10 one tunnel of starting button behind time relay SKC coil one the tunnel through under-voltage protection device QY coil; fixed value resistance DR parallel circuits is connected to contactor JC coil and contact 11; another road of SKC coil is connected to B through fuse RD and imports mutually; QY; another road of DR parallel circuits meets C by fuse RD and imports mutually, and another road of starting button QA end points 10 connects the contact 12 of JC; 13.

The three-phase input links to each other through fuse RD, indicator light ZD.

The contact 14 of thermal relay RJ is corresponding with

contact

24,15 respectively, and contact 24 is connected with the three-phase input, and contact 15 is connected with motor D J, backing inductor 18 1 ends of RJ are connected with contact 4, the other end is connected with contact 25, and contact 26 is corresponding with contact 25, is connected with end points 5.

Fixed value resistance DR1, indicator light ZD1 series circuit and LD coils from parallel connection of coils.

The iron content of time relay SKC is connected with leather cup 16 by spring 27, and support 19 1 ends that are connected with leather cup and the support of SKC 20 are hinged, and the other end has contact 11 to be connected with the coil of JG, and contact 11 is corresponding with fixed contact 12.

Owing non-electricity protector QY is connected with contact 22 by spring 28.Contact 22 is corresponding with contact 7.

The utility model is simple in structure, and protection is reliable.A phase circuit can be by automatic disconnection for several times during work, and every phase all has the assist control protection circuit, and thermal relay, earth leakage protective device, under-voltage protection device, time controller and contactor line contact are in the series connection self-locking state.Short circuit is arranged, transship, fall phase, the electric motor protecting function when under-voltage, electric leakage, sudden power or incoming call.

Following is accompanying drawing of the present utility model:

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is a structural representation of the present utility model.

Following is embodiment of the present utility model:

The knife switch DK that closes, to contactor JC fixed contact 24, another road is bright through fuse RD, resistance R, the indicator light ZD of control circuit through fuse RD for the A phase current.Under-voltage coil QY work, and under the monitoring of resistance DR its normally opened contact 22 of adhesive.

The A phase current is through the normally-closed contact 3,4 of earth leakage protective device LD, the normally-closed contact 25,26 of thermal relay RJ, and one road normally opened contact 8 behind the stop button TA to under-voltage protection device normally opened contact 22 and time relay SKC, another road is to the end points 9 of starting button QA.

Press starting button QA, A phase power supply is the coil by SKC and B power supply formation loop mutually on the one hand, and attract copper wire contact-carrying 15 to touch to close with corresponding contact 14, the normally opened contact 8 of time controller SKC and contactor JC and 13 is closed simultaneously, in the given time, the leather cup 16 pulling contacts 11 of SKC are touched with contact 12 and are closed, and the JC coil is communicated with, motor D J work.

When A phase fuse blows, A phase indicator light goes out, JC and SKC decompression, simultaneously break contact 24, with the main lines of 14,14 and 15 connections, motor is protected.

When B phase fuse blows, B phase indicator light goes out, and the coil of SKC discharges iron content, disconnects main line, draws back the auxiliary contact of JC simultaneously, make JC with C mutually circuit disconnect simultaneously.

When C falls phase mutually, the iron content of JC discharges, and SKC and JC disconnect simultaneously, and A, B phase circuit disconnect, the protection motor.

Excessive when electric current, the normally-closed contact 25 of RJ disconnects under the effect of backing, SKC and JC outage, A, B, the automatic disconnection simultaneously of C phase circuit, protection motor.

When short circuit, the backing inductor of RJ disconnects, and disconnects A, B phase circuit and corresponding auxiliary contact simultaneously, the protection motor.

Motor be in operation have a power failure suddenly or suddenly incoming call and on-the-spot nobody the time, A, B, the automatic disconnection of C phase circuit.

If brownout or when surpassing setting, under the effect of fixed value resistance DR, the automatic decompression of QY coil disconnects auxiliary line and two sections main lines and protects motor under the effect of spring 28.

If motor or protector housing insulation damages or electric leakage; owing to connected line related on motor housing and the protector housing; electric current at first constitutes the loop by resistance DR1 and indicator light ZD1 ground connection; make earth leakage protective coil LD work; disconnect all control circuit loops simultaneously; make earth leakage protective coil LD work, disconnect all control circuits and electric power main line simultaneously and protect motor.

Claims

1. multi-functional electric motor protecting device; it is characterized in that A imports mutually through fuse RD is connected to the fixed contact (24) of contactor JC and the normally-closed contact (3) of earth leakage protective device LD; (4); the normally-closed contact of thermal relay RJ (25); (26) be connected to the end (5) of stop button TA after; be connected to the end of often driving auxiliary contact (8) of time relay SKC behind another end points (6) one tunnel normally opened contacts (7) of TA through under-voltage protection device QY; another road of the end points of TA (6) connects the end (9) of start button QA; the other end (10) one tunnel of starting button is divided into two-way behind time relay SKC coil; wherein one the tunnel through under-voltage protection device QY coil; fixed value resistance DR parallel circuits connects contactor JC coil and contact (11); another road of SKC coil is connected to B through fuse RD and imports mutually; QY; another road of DR parallel circuits meets C by fuse RD and imports mutually, and another road of the end points of starting button QA (10) connects the contact (12) of JC; (13).

2. the motor protecter of stating according to claim 1 is characterized in that the three-phase input links to each other through fuse RD, indicator light ZD.

3. motor protecter according to claim 1 and 2; the contact (14) that it is characterized in that thermal relay RJ is corresponding with contact (24), (15) respectively; contact (24) is connected with the three-phase input; contact (15) is connected with motor D J; backing inductor (18) one ends of RJ are connected with contact (4); the other end is connected with contact (25), and contact (26) are corresponding with contact (25), is connected with end points (5).

4. motor protecter according to claim 1 and 2 is characterized in that fixed value resistance DR1, indicator light ZD1 series circuit and LD coils from parallel connection of coils.

5. motor protecter according to claim 1 and 2; the iron content that it is characterized in that time relay SKC is connected with leather cup (16) by spring (27); support (19) one ends that are connected with leather cup and the support (20) of SKC are hinged; the other end has contact (11) to be connected with the coil of JG, and contact (11) are corresponding with the fixed contact (12) of SKC.

6. motor protecter according to claim 1 and 2 is characterized in that owing non-electricity protector QY and is connected with contact (22) by spring (28), and contact (22) are corresponding with the contact (7) of QY.