CN111412681A - Low-temperature refrigeration control method for air conditioner - Google Patents
Low-temperature refrigeration control method for air conditioner Download PDFInfo
- Publication number
- CN111412681A CN111412681A CN202010240643.9A CN202010240643A CN111412681A CN 111412681 A CN111412681 A CN 111412681A CN 202010240643 A CN202010240643 A CN 202010240643A CN 111412681 A CN111412681 A CN 111412681A
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- Prior art keywords
- compressor
- turning
- air conditioner
- control method
- temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a low-temperature refrigeration control method of an air conditioner, which comprises a compressor, wherein a current transformer is arranged on the compressor and can detect the running current of the compressor; the control method comprises the following steps: 1) the air conditioner operates in a refrigerating mode, and an outdoor fan is started; 2) detecting the running current Ia of the compressor through a current transformer; 3) if Ia is less than I1 and the duration t is more than or equal to t1, turning to the step 4); otherwise, turning to step 8); 4) closing the outdoor fan; 5) continuously detecting Ia; 6) if Ia is more than or equal to I2 and the duration t is more than or equal to t2, turning to step 7); otherwise, turning to step 8); wherein: i1 < I2; 7) starting an outdoor fan, and then turning to the step 2); 8) keeping the current state; go to step 2). The invention can reasonably adjust the circulating air quantity of the outdoor unit and control the condensing temperature to be in an appropriate range when the air conditioner refrigerates at a low temperature, thereby avoiding the adverse effect on user experience caused by frequent start and stop and prolonging the service life of the compressor.
Description
Technical Field
The invention relates to an air conditioner control technology, in particular to a low-temperature refrigeration control method, and specifically relates to a low-temperature refrigeration control method for an air conditioner.
Background
With the development of the market, more and more places need low-temperature refrigeration to maintain indoor low ambient temperature, such as machine rooms, medicine storage storehouses, ice and fresh water supermarkets, laboratories, processing plants with heat sources and the like. The outdoor ambient temperature used in these locations varies from 16 ℃ to-15 ℃, and the indoor ambient temperature is generally about 16 ℃ to 25 ℃.
The air conditioner operates in a low-temperature environment, the condensing temperature of the air conditioning system is reduced due to the fact that the outdoor environment temperature is too low, and the evaporating temperature is reduced. If the condensation temperature is not adjusted, the evaporator can be frozen when the evaporation temperature is lower than 0 ℃, and the air conditioner stops the compressor through the anti-freezing function to prevent the evaporator from being frozen. However, the intermittent operation of the air conditioner will increase the fluctuation of the indoor ambient temperature, which affects the user experience. Meanwhile, in a low temperature environment of 10 ℃ or lower, if the condensation temperature is not adjusted, when the condensation temperature is reduced to a value outside the range in which the compressor normally operates, the life of the compressor is shortened.
The method has the defects that the ① sensor is not firmly inserted, so that the contact thermal resistance is easily increased, the temperature difference between the temperature sensor detection and the actual condenser coil pipe is large, ② refrigerant firstly conducts heat with a heat exchanger copper pipe and then conducts heat with the temperature sensor, the transfer thermal resistance is large, the temperature response is delayed, when the temperature detection is not accurate, the outdoor unit circulating air volume is difficult to operate in the optimal state, the compressor is still easily stopped frequently, the indoor environment temperature fluctuation is large, and the user experience is influenced.
Therefore, improvements are urgently needed.
Disclosure of Invention
The invention aims to provide a low-temperature refrigeration control method of an air conditioner, which can reasonably adjust the circulating air volume of an outdoor unit, control proper condensation temperature and prolong the service life of a compressor during low-temperature refrigeration, and has the advantages of low cost and high reliability.
The technical scheme of the invention is as follows:
a low-temperature refrigeration control method of an air conditioner comprises a refrigerant circulating loop consisting of a compressor, a four-way valve, an outdoor heat exchanger, a throttling component, an indoor heat exchanger and a gas-liquid separator; an outdoor fan is arranged on the outdoor heat exchanger; the compressor is provided with a current transformer which can detect the running current of the compressor; the control method comprises the following steps:
1) the air conditioner operates in a refrigerating mode, and an outdoor fan is started;
2) detecting the running current Ia of the compressor through a current transformer;
3) if Ia is less than I1 and the duration t is more than or equal to t1, turning to the step 4); otherwise, turning to step 8);
4) closing the outdoor fan;
5) continuously detecting Ia;
6) if Ia is more than or equal to I2 and the duration t is more than or equal to t2, turning to step 7); otherwise, turning to step 8); wherein: i1 < I2;
7) starting an outdoor fan, and then turning to the step 2);
8) keeping the current state; go to step 2).
Further, t1 is 0-60 s; and t2 is 0-60 s.
The invention has the beneficial effects that:
the invention has reasonable design and clear logic, can reasonably regulate the circulating air quantity of the outdoor unit and control the condensing temperature to be in an appropriate range when the air conditioner performs low-temperature refrigeration, thereby avoiding the adverse effect on user experience caused by frequent start and stop, prolonging the service life of the compressor and being worthy of popularization.
Drawings
FIG. 1 is a schematic diagram of compressor current versus condensing and evaporating temperatures.
Detailed Description
The invention is further described below with reference to the figures and examples.
The invention relates to an air conditioner, which comprises a refrigerant circulating loop consisting of a compressor, a four-way valve, an outdoor heat exchanger, a throttling component, an indoor heat exchanger and a gas-liquid separator. The outdoor heat exchanger is provided with the outdoor fan, heat exchange of the outdoor heat exchanger can be adjusted, namely the outdoor fan is turned on, heat exchange quantity of the outdoor heat exchanger can be increased, condensation temperature is reduced, and when the outdoor fan is turned off, heat exchange quantity of the outdoor heat exchanger can be reduced, and condensation temperature is improved. The compressor is provided with a current transformer which can detect the running current of the compressor.
As is known in the art, in a fixed frequency air conditioning system, the current of a compressor is related to and proportional to the condensing temperature and the evaporating temperature, as shown in fig. 1. Therefore, the low temperature refrigeration control method includes the steps of:
1) the air conditioner operates in a refrigerating mode, and an outdoor fan is started;
2) detecting the running current Ia of the compressor through a current transformer;
3) if Ia is less than I1 and the duration t is more than or equal to t1, turning to the step 4); otherwise, turning to step 8);
4) closing the outdoor fan;
5) continuously detecting Ia;
6) if Ia is more than or equal to I2 and the duration t is more than or equal to t2, turning to step 7); otherwise, turning to step 8); wherein: i1 < I2;
7) starting an outdoor fan, and then turning to the step 2);
8) keeping the current state; go to step 2).
Preferably, t1 is 0-60 s; and t2 is 0-60 s.
The invention sets two current protection thresholds I1 and I2 corresponding to two target condensation temperatures. The first current protection threshold value I1 is a judgment value for stable heating operation, and the second current protection threshold value I2 is a judgment value for reducing outdoor circulating air volume. By adjusting outdoor circulating air volume, the condensing temperature is in a good interval, so that the icing caused by the excessively low indoor evaporating temperature can be prevented, the compressor can be prevented from stopping working due to the excessively high condensing temperature, the unit can stably refrigerate and run, and the indoor temperature is balanced.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (2)
1. A low-temperature refrigeration control method of an air conditioner comprises a refrigerant circulating loop consisting of a compressor, a four-way valve, an outdoor heat exchanger, a throttling component, an indoor heat exchanger and a gas-liquid separator; an outdoor fan is arranged on the outdoor heat exchanger; the method is characterized in that: the compressor is provided with a current transformer which can detect the running current of the compressor; the control method comprises the following steps:
1) the air conditioner operates in a refrigerating mode, and an outdoor fan is started;
2) detecting the running current Ia of the compressor through a current transformer;
3) if Ia is less than I1 and the duration t is more than or equal to t1, turning to the step 4); otherwise, turning to step 8);
4) closing the outdoor fan;
5) continuously detecting Ia;
6) if Ia is more than or equal to I2 and the duration t is more than or equal to t2, turning to step 7); otherwise, turning to step 8); wherein: i1 < I2;
7) starting an outdoor fan, and then turning to the step 2);
8) keeping the current state; go to step 2).
2. The low-temperature refrigeration control method of the air conditioner according to claim 1, wherein: t1 is 0-60 s; and t2 is 0-60 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010240643.9A CN111412681A (en) | 2020-03-31 | 2020-03-31 | Low-temperature refrigeration control method for air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010240643.9A CN111412681A (en) | 2020-03-31 | 2020-03-31 | Low-temperature refrigeration control method for air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN111412681A true CN111412681A (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010240643.9A Pending CN111412681A (en) | 2020-03-31 | 2020-03-31 | Low-temperature refrigeration control method for air conditioner |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101256021A (en) * | 2007-09-27 | 2008-09-03 | 宁波奥克斯空调有限公司 | Control method for air conditioner capable of low-temperature refrigeration |
| CN101876474A (en) * | 2010-07-22 | 2010-11-03 | 四川长虹空调有限公司 | Method for automatically detecting lack of refrigerant in air-conditioner |
| CN103115417A (en) * | 2013-03-19 | 2013-05-22 | 海尔集团公司 | Refrigeration method of low temperature environment air conditioner |
| CN106440587A (en) * | 2016-09-29 | 2017-02-22 | 海信（广东）空调有限公司 | Air conditioner refrigeration control method and air conditioner |
| CN109099556A (en) * | 2018-08-27 | 2018-12-28 | 海信（山东）空调有限公司 | Low temperature refrigeration of air conditioner control method and air conditioner |
| CN110274363A (en) * | 2019-06-26 | 2019-09-24 | 珠海格力电器股份有限公司 | Air conditioner control method and device and air conditioner |
-
2020
- 2020-03-31 CN CN202010240643.9A patent/CN111412681A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101256021A (en) * | 2007-09-27 | 2008-09-03 | 宁波奥克斯空调有限公司 | Control method for air conditioner capable of low-temperature refrigeration |
| CN101876474A (en) * | 2010-07-22 | 2010-11-03 | 四川长虹空调有限公司 | Method for automatically detecting lack of refrigerant in air-conditioner |
| CN103115417A (en) * | 2013-03-19 | 2013-05-22 | 海尔集团公司 | Refrigeration method of low temperature environment air conditioner |
| CN106440587A (en) * | 2016-09-29 | 2017-02-22 | 海信（广东）空调有限公司 | Air conditioner refrigeration control method and air conditioner |
| CN109099556A (en) * | 2018-08-27 | 2018-12-28 | 海信（山东）空调有限公司 | Low temperature refrigeration of air conditioner control method and air conditioner |
| CN110274363A (en) * | 2019-06-26 | 2019-09-24 | 珠海格力电器股份有限公司 | Air conditioner control method and device and air conditioner |
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Application publication date: 20200714 |