CN2152301Y - Heat compensate refrigerator over-current over-temperature rise double protector - Google Patents
Heat compensate refrigerator over-current over-temperature rise double protector Download PDFInfo
- Publication number
- CN2152301Y CN2152301Y CN 93211277 CN93211277U CN2152301Y CN 2152301 Y CN2152301 Y CN 2152301Y CN 93211277 CN93211277 CN 93211277 CN 93211277 U CN93211277 U CN 93211277U CN 2152301 Y CN2152301 Y CN 2152301Y
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- motor
- over
- temperature
- current
- heat
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- Expired - Fee Related
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- Motor And Converter Starters (AREA)
Abstract
The utility model relates to a motor over-current over-temperature double rising protector used for refrigerating compressors for refrigerators. A heat compensating element 4 is added on the basis of an existing dish-shaped heat sensitive bimetal sheet over-current over-temperature protector to prolong the recovery time of bimetal sheets 1 after the bimetal sheets are bent and overturned during the over-current and the over-temperature processes of a motor, so that the motor can radiate heat sufficiently. The motor can be restarted until the pressure of a refrigerating system is balanced, and the motor can be protected really. One end of a heat resistant element is connected with one of two contacts, and the other end is connected with the binding post of a housing. The heat sensitive bimetal sheets are connected with the two contacts, and the compensating element is connected between the two contacts.
Description
The utility model relates to a kind of motor overcurrent as the refrigerator refrigerant compressor and crosses the two protectors of temperature rise.
At present, the overcurrent and overheating protection device of refrigerator and air-conditioning is to adopt the heat-sensitive duplex metal chip mostly.Thermosensitive bimetal is heated crooked upset and cuts off circuit this protector at overcurrent or when crossing temperature rise, reaches the purpose of protection motor.But this thermosensitive bimetal protector has following defective when being used for refrigeration plant such as refrigerator and air-conditioning: the resistance heat element is with bimetal leaf heating upset when overcurrent or excess temperature appear in the motor of refrigerant compressor; the contact disconnects; the protection motor; because the volume of protector is little; heat radiation is very fast; bimetal leaf just can cool off within one minute; the make contact that overturns makes the motor operation; and motor is in closed state; it is slow to dispel the heat, and the pressure of general refrigerating system reaches balanced process 3-5 minute that need.Compressor is difficult for starting successfully before pressure restores balance.Therefore, can not satisfy motor the recovery time of protector and restart the required time interval.Motor starts under superheat state, because starting current is big, motor further heats up; protector is rotary movement once more, thereby causes the frequent starting of motor, and temperature rises higher and higher; causing insulation to be crossed thermal breakdown, motor is damaged and burning, and can not start compressor effectively.This phenomenon is especially obvious when line voltage low excessively (170V) or too high (245V) compressor generation stall.
The purpose of this utility model provides a kind of two protectors of thermosensitive bimetal refrigerator excess-current excess-temperature that have thermal compensation device; prolong the recovery time of protector bimetal leaf; after overcurrent, excess temperature occurring or when motor generation stall, avoid the frequent starting of motor, motor is played real protective effect.
The purpose of this utility model is to realize by following technical scheme: a resistance heat element is arranged in this excess-current excess-temperature protector, and the windings in series of one end and motor, the other end is connected with a contact.Connect a dish-shaped thermosensitive bimetal between two contacts, other has the two ends of the thermal compensation device of a big resistance to link to each other with two contacts respectively.When the motor overcurrent of refrigerant compressor, the resistance heat element heats dish-shaped thermosensitive bimetal, the crooked upset of bimetal leaf after reaching the dropout temperature, double-contact is disconnected, at this moment because the resistance of thermal compensation device is bigger, and voltage mainly is added in the thermal compensation device two ends, electric current is very little in the loop, motor windings is equivalent to off state basically, and motor is out of service.The contact disconnects the back bimetal leaf and begins cooling, and when temperature dropped to certain value, bimetal leaf overturn and returns to connect double-contact.Overturn recovery time in order to prolong bimetal leaf, after it is threaded off, utilize thermal compensation device that thermosensitive bimetal is carried out thermal compensation and prolong recovery time, thermal compensation power is generally all very little, the electric current that the contact disconnects back thermal compensation device and motor winding is about 10mA, the heat Q=0.24I that utilizes it to produce
2Rt extends to 3-5 recovery time with the upset of thermosensitive bimetal and divides kind, so that the pressure balance of refrigerating system, motor temperature are restarted motor after descending.In addition, this protector is long at the refrigerant compressor continuous operation time, and the motor winding temperature rise is too high; when causing the compressor case temperature too high,, make the butterfly shaped dual metal sheet upset of being heated by thermal radiation and conduction; disconnect double-contact, reduce electric current and make the motor stall, protect it not to be damaged or burn.
Can for example use the thermal compensation device of different capacity by regulating the recovery time that thermal compensation device change thermosensitive bimetal in this protector, or the distance of regulating between itself and bimetal leaf realizes.Thermal compensation device can adopt general resistance heat element, also can adopt positive temperature coefficient (PTC) element, utilize under the PTC element normal temperature resistance very little, the energising heating just can reach Curie point (this moment, resistance can reach megaohm) after very short time characteristic has satisfied the requirement as thermal compensation device just.
Below in conjunction with accompanying drawing the utility model is elaborated
Fig. 1 is the fundamental diagram of thermosensitive bimetal excess-current excess-temperature protector of the present utility model;
Fig. 2 is the circuit diagram of protector;
Fig. 3 is the structure chart of protector.
Among the figure: 1. thermosensitive bimetal, 2. double-contact, 3. resistance heat element, 4. thermal compensation device, 5. positive temperature coefficient (PTC) starter, 6. motor start-up winding, 7. motor operation winding, 8. shell.
With reference to accompanying drawing: 7 places in circuit in parallel are organized with operation in PTC starter 5 back of connecting with electric motor starting winding 6.The moment of power connection and since in the PTC starter 5 time by electric current very short, the heat of generation seldom, temperature is lower, this moment, the resistance of starter 5 was very little, started winding 6 and was in conducting state, the rotor startup running.After reaching rated speed, because the thermal effect of electric current, the temperature of PTC starter 5 raises rapidly, and resistance is very big, starts winding 6 and is equivalent to off state, finishes startup.When overcurrent appearred in circuit in electric motor starting or the operation process, 3 heatings of resistance heat element made thermosensitive bimetal 1 be bent upwards upset, and double-contact 2 disconnects.At this moment the electric current in the motor windings is through thermal compensation device 4, because the resistance of thermal compensation device 4 is bigger, electric current in the winding is reduced to is about 10mA, and motor is equivalent to be in off state, thereby motor is played a protective role.The heat of thermal compensation device 4 generations this moment carries out thermal compensation to prolong the recovery time that it overturns downwards to thermosensitive bimetal 1, and motor temperature reduces by the time, startup once more after the refrigerating system pressure balance.For low-power machine, protector inside has resistance heat element 3, and when being used for heavy-duty motor, protector inside is strip resistance thermal element 3 not.
The two protectors of refrigerator over current of motor excess temperature of the present utility model are to increase a thermal compensation device on the basis of existing dish-shaped thermosensitive bimetal excess-current excess-temperature protector; simple in structure; and prolonged recovery time of bimetal leaf effectively; avoided the frequency of the motor of refrigerant compressor to start, motor has really been played protective effect.
Claims (3)
1, the two protectors of a kind of thermal compensation type refrigerator excess-current excess-temperature; form by thermosensitive bimetal (1), double-contact (2), resistance heat element (3), thermal compensation device (4), shell (8); it is characterized in that: resistance heat element (3) one ends connect a contact in the double-contact (2); the other end connects the binding post of shell (8); thermosensitive bimetal (1) is connected on the double-contact (2), and compensating element, (4) is connected across between the double-contact (2).
2, the two protectors of thermal compensation type refrigerator excess-current excess-temperature according to claim 1, it is characterized in that: thermal compensation device (4) is made with common resistance heat element.
3, the two protectors of thermal compensation type refrigerator excess-current excess-temperature according to claim 1, it is characterized in that: thermal compensation device (4) is made with positive temperature coefficient (PTC) element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93211277 CN2152301Y (en) | 1993-05-05 | 1993-05-05 | Heat compensate refrigerator over-current over-temperature rise double protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93211277 CN2152301Y (en) | 1993-05-05 | 1993-05-05 | Heat compensate refrigerator over-current over-temperature rise double protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2152301Y true CN2152301Y (en) | 1994-01-05 |
Family
ID=33792948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93211277 Expired - Fee Related CN2152301Y (en) | 1993-05-05 | 1993-05-05 | Heat compensate refrigerator over-current over-temperature rise double protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2152301Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007033537A1 (en) * | 2005-09-26 | 2007-03-29 | Changshu Tianyin Electromechanical Co., Ltd. | An overload protector for single ac motor |
| CN102678508A (en) * | 2011-03-18 | 2012-09-19 | 森萨塔科技（常州）有限公司 | Air conditioner compressor provided with motor protector, and air conditioner |
| CN103515146A (en) * | 2013-09-29 | 2014-01-15 | 扬州宝珠电器有限公司 | Fastener type temperature current trigger |
| CN109980619A (en) * | 2019-03-15 | 2019-07-05 | 南京时恒电子科技有限公司 | A kind of surge current protection element for frequent starting device |
| CN114188185A (en) * | 2021-11-18 | 2022-03-15 | 创维电器股份有限公司 | Timing switch circuit of mechanical direct-cooling single-system refrigerator |
-
1993
- 1993-05-05 CN CN 93211277 patent/CN2152301Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007033537A1 (en) * | 2005-09-26 | 2007-03-29 | Changshu Tianyin Electromechanical Co., Ltd. | An overload protector for single ac motor |
| CN102678508A (en) * | 2011-03-18 | 2012-09-19 | 森萨塔科技（常州）有限公司 | Air conditioner compressor provided with motor protector, and air conditioner |
| CN103515146A (en) * | 2013-09-29 | 2014-01-15 | 扬州宝珠电器有限公司 | Fastener type temperature current trigger |
| CN109980619A (en) * | 2019-03-15 | 2019-07-05 | 南京时恒电子科技有限公司 | A kind of surge current protection element for frequent starting device |
| CN114188185A (en) * | 2021-11-18 | 2022-03-15 | 创维电器股份有限公司 | Timing switch circuit of mechanical direct-cooling single-system refrigerator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |