CN201966137U

CN201966137U - Protection switch of motor

Info

Publication number: CN201966137U
Application number: CN2011201143593U
Authority: CN
Inventors: 卜春国
Original assignee: XIANGYANG CHONGYA ELECTRICAL APPLIANCE CO Ltd
Current assignee: XIANGYANG CHONGYA ELECTRICAL APPLIANCE CO Ltd
Priority date: 2011-04-19
Filing date: 2011-04-19
Publication date: 2011-09-07
Anticipated expiration: 2021-04-19

Abstract

The utility model discloses a protection switch of a motor, which is used for protecting the circuits of the motors under short circuit, overload and default phases. Temperature control moulds are respectively arranged at the left side and the right side inside an alternating current contactor; a mounting board of the temperature module is fixedly provided with three coil windings; a main coil is wound outside a temperature control switch; a primary coil winding and a third-level coil winding are fixed on the mounting board; a square hole is arranged in the mounting board; the leads of a movable contact blade and a static contact blade of the temperature control switch and the outgoing line of the main coil are led out from the square hole. The two phases of a triplephase line are respectively detected by two modules; the main coil heats to heat the temperature control switch to the control temperature of the temperature control switch, cuts off the current of an electromagnetic coil of the alternating current contactor and cuts off a triplephase power to play the role of protecting the motor when short circuit or overload occurs to any two phases. The protection switch of the motor has the advantages of low cost, high reliability, broad sphere of application, and convenient installation and use. Moreover, the protection switch of the motor not only can be used for motors and circuits with balanced loads, but also can show specific advantages on motors and circuits with unbalanced loads.

Description

Motor protecting switch

Technical field

The utility model relates to electric equipment control technology field, especially for the motor line protection switch of motor short circuit, overload and open-phase protection.

Background technology

Motor protecter commonly used is divided into mechanical type and electronic type two big classes, mechanically mainly cooperate A.C. contactor to use based on thermal relay, need regulate setting current when thermal relay uses, the adjusting of setting current is cumbersome, and precision is not high, not too popular with users yet; Electronic type susceptibility height is measured accurately, and is easy to install, but also there is following shortcoming in it: on the one hand, often be easy to generate misoperation when motor load is unbalanced, cause the reduction of production efficiency; On the other hand, the better protection motor to need to imbed temperature sensor or magnetic field sensor in motor, the production maintenance is very inconvenient.

Though the electric motor protecting product category is various, all protectors at all are standard electromotors.The present domestic middle low power motor of producing; a lot of criteria of right and wrong motors are arranged; that is to say; the parts such as enamelled wire thickness, groove number and every line of rabbet joint number of turns of the motor of finding by the motor model are not inconsistent with actual parameter; be use inferior materials and turn out substandard goods due to, this has a greatly reduced quality with regard to the rated power that makes real electrical machinery, short circuit, overload current are all different with standard electromotor; even the motor protecter of match power has been installed, do not have the effect of protection yet.

Summary of the invention

For solving existing motor because the motor that short circuit, overload or phase shortage cause burns out; or because problems such as the frequent outages of the unbalanced motor that causes of motor load; goal of the invention of the present utility model is to provide a kind of motor protecting switch, to realize the purpose of reliably protecting motor.

For achieving the above object, the both sides in the A.C. contactor of the present utility model respectively are equipped with temperature control module.

Be fixed with three coil windings on the mounting panel of described temperature control module, temperature detect switch (TDS) is around with main coil, all the other two windings all are fixed on the temperature control module mounting panel, and the outlet of the movable contact spring of temperature detect switch (TDS) and the lead-in wire of static contact and main coil is drawn from the square opening of mounting panel.

Be wound with main coil on the shell of temperature detect switch (TDS), dividing plate one is housed in the shell, one built-in pair of gold plaque of dividing plate, gapped between dividing plate one and the two gold plaque; Dividing plate two is contained in the bottom of dividing plate one, and movable contact spring and static contact pass dividing plate two respectively, can slide in the hole of dividing plate two, and two contacts are corresponding; Guide rod passes dividing plate one, static contact, and two ends contact with movable contact spring with two gold plaques respectively, and the bottom of shell connects baffle plate, and shell and baffle plate have the outer that prevents the main coil landing.

Temperature control module seals in respectively in any two-phase of A.C. contactor, and the phase line Wo on the outlet binding post of A.C. contactor is connected to main coil LBL, secondary coil LML and three grades of coil LSL through behind the A.C. contactor; Phase line Uo on the outlet binding post is connected to main coil LBR, secondary coil LMR and three grades of coil LSR through behind the A.C. contactor; The LML of secondary coil, LMR are connected to the left side retaining of dpdt double-pole double-throw (DPDT) gear on-off, and the LSL of three grades of coils, LSR are connected to the right side retaining of dpdt double-pole double-throw (DPDT) gear on-off; The middle apron uplink of dpdt double-pole double-throw (DPDT) gear on-off and main coil LBL are connected to the phase line Wi of the inlet wire binding post of three-phase alternating current; The middle apron downlink of dpdt double-pole double-throw (DPDT) gear on-off and main coil LBR are connected to the phase line Vi of inlet wire binding post; Vo on the outlet binding post directly links to each other with the Ui of inlet wire binding post through behind the A.C. contactor; Solenoid one end is directly connected to the Ui of inlet wire binding post, and the other end is connected to the lead-in wire of temperature detect switch (TDS), on the phase line Vi of temperature detect switch (TDS) through being connected to the inlet wire binding post behind the starting switch; The A.C. contactor auxiliary contact be incorporated into the starting switch two ends after shutdown switch is connected.

Two modules of the present utility model detect the two-phase in the triple line respectively; there is any two-phase to be short-circuited or transships; the main coil heating; temperature detect switch (TDS) is heated to the control temperature of temperature detect switch (TDS); temperature detect switch (TDS) disconnects the A.C. contactor solenoid current; A.C. contactor disconnects three-phase electricity, to play the effect of protection motor and circuit.Because the motor of same nominal power, enamelled wire line footpath, groove number and every slot coil number average are inequality, that is to say that short circuit, overload current are inequality, add the nonstandard motor of part, the control effect that coil is difficult to reach good, secondary coil and three grades of coils are to cooperate with power but the motor of different size in order to adjust.Through simple test, select suitable gear before using, just can come into operation.

The utility model compared with prior art, cost is low, the reliability height is applied widely, easy to install, both can be used for the motor of equally loaded, can give play to its peculiar strong point again on the unbalanced motor of load.

Description of drawings

Fig. 1 is a three-dimensional sketch of the present utility model;

Fig. 2 is the three-dimensional sketch of A.C. contactor 2 among Fig. 1;

Fig. 3 is the vertical view of Fig. 2;

Fig. 4 is the cutaway view of Fig. 2;

Fig. 5 is the three-dimensional sketch of Fig. 4 temperature control module 22;

Fig. 6 is the structure diagram of temperature detect switch (TDS) 29 among Fig. 5;

Fig. 7 is that circuit of the present utility model connects sketch.

Embodiment

As shown in Figure 1, loam cake 1 is fixed on the lower cover 3 by screw, A.C. contactor 2 is fixed on the mount pad 5 by screw, and mount pad 5 is fixed on the lower cover 3 by the mode of welding, and dpdt double-pole double-throw (DPDT) gear on-off 4, starting switch 6 and shutdown switch 7 are equipped with in the front of lower cover 3.

As Fig. 2, shown in Figure 3, the auxiliary contact system 15 of A.C. contactor, being mainly to start or stop provides auto-lock function.Three-phase alternating current is received on the inlet wire binding post 11, three lines of motor are received on the outlet binding post 12, their difference comes as seen in Figure 3, and the binding post in right side and outlet binding post left side disconnects in the inlet wire binding post 11, and moving contact 9 is fixed on the support 8 by the pulling force of spring.After the solenoid energising, pulling moving contact 9 is connected circuit turn-on with inlet wire side fixed contact 10.Installing hole 14 provides approach for the installation of A.C. contactor 2.Sequence number 13 is a normally-closed contact.

As shown in Figure 4, the auxiliary contact system 15 of A.C. contactor, comprise two groups of normally-closed contacts 13 and two groups of normally opened contacts 18, moving contact 9 is fixed on the support by the pulling force of spring 17, moving iron core 19 snaps on the support by iron plate, solenoid 20 is enclosed within on the static iron core 24, static iron core 24 is fixed on the base 23, base 23 is fixed on the shell by screw, solenoid 20 separates by compression spring 21 with moving iron core 19, on solenoid 20 energising static iron cores 24, produce than high-intensity magnetic field, overcome the elastic force of compression spring 21, with the support pulling of moving iron core 19 and linking together, moving contact 9 is connected with fixed contact outlet side 16, current lead-through is to finish the switching function of A.C. contactor.The left and right sides of A.C. contactor is equipped with temperature control module 22.

As shown in Figure 5, be fixed with three coil windings on the mounting panel 32 of temperature control module, temperature detect switch (TDS) 29 is around with main coil 30, be fixed with secondary coil winding 26 and three grades of coil windings 25 on the mounting panel 32, square opening 34 is arranged on the mounting panel 32, and the outlet of the movable contact spring of temperature detect switch (TDS) 29 and the lead-in wire of static contact 33 and main coil 30 is drawn from square opening 34.Sequence number 31 is a secondary coil, and sequence number 27 is three grades of coils.

As shown in Figure 6, be wound with main coil 30 on the shell 35 of temperature detect switch (TDS), dividing plate 1 is housed in the shell 35, one 38 built-in pairs of gold plaques of dividing plate 36, gapped between dividing plate 1 and the two gold plaque 36; Dividing plate 2 39 is contained in the bottom of dividing plate 1, and movable contact spring 41 passes dividing plate 2 39 respectively with static contact 42, can slide in the hole of dividing plate 2 39, and two contacts are corresponding; Guide rod 37 passes dividing plate 1, static contact 42, and two ends contact with movable contact spring 41 with two gold plaques 36 respectively, and the bottom of shell 35 connects baffle plate 40, and shell 35 has the outer that prevents main coil 30 landings with baffle plate 40.The metal shell 35 of temperature detect switch (TDS) plays heat conduction that conductive force are produced main coil 30 on the one hand to two gold plaques 36.When its zero boundary temperature of temperature arrival of two gold plaques 36, the edge of two gold plaques 36 is upturned, and is middle to lower process, after dividing plate one 38 guiding, guide rod 37 promoted downwards, and the movable contact spring 41 of temperature detect switch (TDS) separates with static contact 42, and temperature detect switch (TDS) disconnects.When the temperature reduction, two gold plaques 36 recover the conducting again of the contact of temperature detect switch (TDS).

As shown in Figure 7, the phase line Wo on the outlet binding post 12 of A.C. contactor is connected to main coil 30LBL, secondary coil 31LML and three grades of coil 27LSL through behind the A.C. contactor 2; Phase line Uo on the outlet binding post 12 is connected to main coil 30LBR, secondary coil 31LMR and three grades of coil 27LSR through behind the A.C. contactor 2; The LML of secondary coil 31, LMR are connected to the left side retaining of dpdt double-pole double-throw (DPDT) gear on-off 4, and the LSL of three grades of coils 27, LSR are connected to the right side retaining of dpdt double-pole double-throw (DPDT) gear on-off 4; The middle apron uplink of dpdt double-pole double-throw (DPDT) gear on-off 4 and main coil 30LBL are connected to the phase line Wi of the inlet wire binding post 11 of three-phase alternating current; The middle apron downlink of dpdt double-pole double-throw (DPDT) gear on-off 4 and main coil 30LBR are connected to the phase line Vi of inlet wire binding post 11, LBL, LML, LSL must be on the same cuttves of dpdt double-pole double-throw (DPDT) gear on-off 4, and LBR, LMR, LSR also must be on the same cuttves of dpdt double-pole double-throw (DPDT) gear on-off 4; Vo on the outlet binding post 12 directly links to each other with the Ui of inlet wire binding post 11 through A.C. contactor 2 backs; Solenoid 20KM one end is directly connected to the Ui of inlet wire binding post 11, and the other end is connected to the lead-in wire 33 of temperature detect switch (TDS) 29, and temperature detect switch (TDS) 29 is connected on the phase line Vi of inlet wire binding post 11 after often opening moving switch 6KO; A.C. contactor auxiliary contact two 18KM be incorporated into starting switch 6KO two ends after shutdown switch 7KC connects.

When starting switch 6KO presses, solenoid 20KM conducting, 2 conductings of A.C. contactor switch, auxiliary contact two 18KM conductings, at this moment, even unclamp starting switch 6KO, solenoid 20KM conducting still, at this moment, electric current is through shutdown switch 7KC and the two 18KM conductings of A.C. contactor auxiliary contact.At this moment, if press shutdown switch 7KC, solenoid 20KM disconnects, and A.C. contactor 2 disconnects.

After A.C. contactor 2 is connected; if overload appears in the load end motor, when short circuit or phase shortage, the main coil 30 on temperature detect switch (TDS) generates heat; before burn-down of electric motor; temperature detect switch (TDS) reaches its zero boundary temperature, and the movable contact spring of temperature detect switch (TDS) and the lead-in wire of static contact 33 disconnect, and solenoid 20KM disconnects; A.C. contactor 2 disconnects; to realize phase shortage, to transship, short circuit is to the protection of motor.

Claims

1. a motor protecting switch comprises A.C. contactor (2), it is characterized in that: the both sides in the A.C. contactor (2) respectively are equipped with temperature control module (22).

2. motor protecting switch according to claim 1; it is characterized in that: be fixed with three coil windings on the mounting panel (32) of described temperature control module (22); temperature detect switch (TDS) (29) is around with main coil (30); be fixed with secondary coil winding (26) and three grades of coil windings (25) on the mounting panel (32); square opening (34) is arranged on the mounting panel (32), and the movable contact spring (41) of temperature detect switch (TDS) (29) is drawn from square opening (34) with the outlet of the lead-in wire (33) of static contact (42) and main coil (30).

3. motor protecting switch according to claim 2, it is characterized in that: be wound with main coil (30) on the shell (35) of temperature detect switch (TDS) (29), dividing plate one (38) is housed in the shell (35), dividing plate one (38) built-in pairs of gold plaques (36), gapped between dividing plate one (38) and the two gold plaque (36); Dividing plate two (39) is contained in the bottom of dividing plate one (38), and movable contact spring (41) passes dividing plate two (39) respectively with static contact (42), can slide in the hole of dividing plate two (39), and two contacts are corresponding; Guide rod (37) passes dividing plate one (38), static contact (42), two ends contact with movable contact spring (41) with two gold plaques (36) respectively, the bottom of shell (35) connects baffle plate (40), and shell (35) has the outer that prevents main coil (30) landing with baffle plate (40).

4. motor protecting switch according to claim 1, it is characterized in that: temperature control module (22) seals in respectively in any two-phase of A.C. contactor (2), is connected to main coil (30) LBL, secondary coil (31) LML and three grades of coils (27) LSL behind the phase line Wo process A.C. contactor (2) on the outlet binding post (12) of A.C. contactor (2); Be connected to main coil (30) LBR, secondary coil (31) LMR and three grades of coils (27) LSR behind the phase line Uo process A.C. contactor (2) on the outlet binding post (12); LML, the LMR of secondary coil (31) is connected to the left side retaining of dpdt double-pole double-throw (DPDT) gear on-off (4), and LSL, the LSR of three grades of coils (27) is connected to the right side retaining of dpdt double-pole double-throw (DPDT) gear on-off (4); The middle apron uplink of dpdt double-pole double-throw (DPDT) gear on-off (4) and main coil (30) LBL are connected to the phase line Wi of the inlet wire binding post (11) of three-phase alternating current; The middle apron downlink of dpdt double-pole double-throw (DPDT) gear on-off (4) and main coil (30) LBR are connected to the phase line Vi of inlet wire binding post (11); Vo on the outlet binding post (12) directly links to each other with the Ui of inlet wire binding post (11) through A.C. contactor (2) back; Solenoid (20) one ends are directly connected to the Ui of inlet wire binding post (11), and the other end is connected to the lead-in wire (33) of temperature detect switch (TDS) (29), and temperature detect switch (TDS) (29) is connected on the phase line Vi of inlet wire binding post (11) behind starting switch (6); A.C. contactor auxiliary contact two (18) be incorporated into starting switch (6) two ends after shutdown switch (7) is connected.