CN110470070B - Air conditioner self-cleaning control method - Google Patents
Air conditioner self-cleaning control method Download PDFInfo
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- CN110470070B CN110470070B CN201910717304.2A CN201910717304A CN110470070B CN 110470070 B CN110470070 B CN 110470070B CN 201910717304 A CN201910717304 A CN 201910717304A CN 110470070 B CN110470070 B CN 110470070B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
Abstract
The invention relates to an air conditioner self-cleaning control method, which comprises a refrigerant circulating loop consisting of a compressor, a four-way valve, an outdoor heat exchanger, a throttling component, a stop valve, an indoor heat exchanger and a gas-liquid separator, wherein temperature sensors are respectively arranged on the compressor, the outdoor heat exchanger and the indoor heat exchanger. The control method comprises a preheating process, a frosting process, a drying process I, a drying process II and a drying process III, can effectively enhance the cleaning effect of the air conditioner heat exchanger, can sterilize at high temperature and keeps the heat exchanger dry. Moreover, the liquid return amount of the system can be controlled by controlling the exhaust superheat degree, so that the oil dilution of the liquid refrigerant is reduced, and the service life of the compressor is prolonged.
Description
Technical Field
The patent relates to an air conditioner control technology, in particular to an air conditioner self-cleaning control method.
Background
When the air conditioner is used for long-time refrigeration, condensed water on the surface of the heat exchanger cannot be dried in time, bacteria, mold and the like are bred in a humid environment, peculiar smell is generated, and the health of a human body is influenced; in addition, if the air conditioner is not used for a long time, a large amount of dust can be accumulated on the surface of the heat exchanger, the air flow circulation resistance is increased, the refrigerating and heating effects are influenced, and the indoor air quality can be influenced by blown dust. Therefore, in order to solve the problems of humidity inside the air conditioner and dust deposition of the heat exchanger, a self-cleaning function is provided.
The self-cleaning function of the existing air conditioner utilizes the condensed water of the heat exchanger to clean the surface to achieve the purpose of cleaning, generally focuses on the cleaning dust removal effect, neglects the drying of the surface of the heat exchanger after the cleaning is finished, and has small effect of eliminating mould and peculiar smell, so the self-cleaning function of the patent focuses more on the sterilization, smell removal and drying effects after the cleaning of the heat exchanger is finished.
In the existing air conditioner self-cleaning control method, only some factors influencing self-cleaning efficiency, such as environment temperature, evaporation temperature, humidity and the like, are generally paid attention to, and the consideration on the reliability factors of an air conditioning system, such as oil return of a compressor, liquid return and the like, is neglected.
Disclosure of Invention
The invention aims to provide a self-cleaning control method of an air conditioner aiming at the defects of the prior art, which can not only achieve the purpose of cleaning a heat exchanger, ensure the use effect of the air conditioner and avoid the generation of peculiar smell of the air conditioner, but also improve the operation reliability of the air conditioner in the self-cleaning process.
The technical scheme of the invention is as follows:
a self-cleaning 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, a stop valve, an indoor heat exchanger and a gas-liquid separator, wherein an exhaust temperature sensor is arranged at an exhaust port of the compressor; an outdoor heat exchanger coil pipe temperature sensor and an outdoor return air temperature sensor are arranged on the outdoor heat exchanger; an indoor heat exchanger coil pipe temperature sensor and an indoor return air temperature sensor are arranged on the indoor heat exchanger; the control method comprises the following steps:
1) detecting the indoor environment temperature T1 through an indoor return air temperature sensor; detecting the outdoor environment temperature T4 through an outdoor return air temperature sensor, and determining the target discharge superheat Tg1 of the compressor corresponding to the T4;
2) starting a preheating process, and timing: starting a refrigeration mode, wherein the frequency of a compressor is P1;
3) detecting a compressor discharge temperature T5 by a discharge temperature sensor; detecting the temperature T3 of the coil of the outdoor heat exchanger by an outdoor heat exchanger coil temperature sensor; detecting the temperature Tp of the coil pipe of the indoor heat exchanger by using a coil pipe temperature sensor of the indoor heat exchanger; calculating to obtain the superheat degree Tg = T5-T3 of the compressor exhaust gas; and an air condensation target threshold Δ Ta = T1-Tp;
4) when Tg is less than Tg1 or delta Ta is less than 17 ℃, the next step is carried out; otherwise, returning to the previous step; wherein: tg1 is the target superheat degree for normal operation of the compressor;
5) the frequency of the compressor is increased by 2Hz every 30s, and when Tg is more than Tg1 or delta Ta is more than 17 ℃, the current frequency is maintained; or the frequency does not rise any more when reaching the allowable upper limit value;
6) continuously detecting T5 and T3 to obtain Tg;
7) if Tg is more than Tg1, and the duration time reaches the accumulated time 1, or the preheating duration time reaches the accumulated time 2, turning to the next step, or returning to the previous step;
8) exiting the preheating process, entering the frosting process, and timing: maintaining a cooling mode and a current compressor frequency;
9) continuously detecting T5 and T3 to obtain Tg;
10) if Tg is less than Tg2 and the duration reaches the accumulated time 3, or the duration of the frosting process reaches the accumulated time 4, turning to the next step, or else, returning to the previous step; wherein: tg2 is the lower limit of the superheat degree of the normal operation of the compressor, and Tg2 is less than Tg 1;
11) exiting the frosting process, entering a drying process I, and timing: the frequency of the compressor is operated according to P2, and the four-way valve of the unit is switched to be converted into a heating mode;
12) detecting Tp;
13) if Tp = Tp1 and the duration reaches the accumulated time 5, or the drying duration reaches the accumulated time 6, turning to the next step, or returning to the previous step; wherein: tp1 is a set indoor coil first target temperature value;
14) exiting the drying process I, entering a drying process II, and timing: keeping the heating mode, and keeping the frequency of the compressor to be P2 running;
15) detecting T5 and Tp;
16) if T5 is more than 100 ℃ or Tp is more than 50 ℃, reducing the frequency of the compressor by 4Hz every 20s, and not reducing the frequency when the frequency is reduced to a lower limit value allowed by the frequency, otherwise, maintaining the current frequency of the compressor and returning to the previous step;
17) if T5 > 115 ℃ or TP > 60 ℃ for 5s, switching to step 19), otherwise, switching to step 15);
18) when Tp is more than Tp2 and the duration reaches the accumulated time 7, or the drying duration reaches the accumulated time 8, turning to the next step, or returning to the previous step; wherein: tp2 is the second target temperature value of indoor coil, and TP1 < TP 2;
19) exiting the drying process II, entering a drying process III, and timing; stopping the compressor;
20) and when the drying duration reaches the accumulated time 9, quitting the drying process III and ending the control.
Further, in the step 2), the indoor fan is the lowest gear, and the outdoor fan is turned on.
Further, in the step 8), the indoor fan is turned off, and the outdoor fan is kept turned on.
Further, in the step 11), the indoor fan is kept closed; the outdoor fan remains on.
Further, in the step 14), the indoor fan operates according to the lowest gear; the outdoor fan remains on.
Further, in the step 19), the indoor fan keeps the lowest-gear operation; the outdoor fan is turned off.
The invention has the beneficial effects that:
the invention has reasonable design and clear logic, can enhance the cleaning effect, can sterilize at high temperature and keeps the heat exchanger dry. In addition, the liquid return amount of the system can be controlled by controlling the exhaust superheat degree, the dilution of liquid refrigerants to oil is reduced, and the service life of the compressor can be prolonged.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
Wherein: 1-a compressor; 2-a four-way valve; 3-an outdoor heat exchanger; 4-a throttling component; 5-a stop valve; 6-indoor heat exchanger; 7-gas-liquid separator; 8-exhaust gas temperature sensor; 9-outdoor heat exchanger coil temperature sensor; 10-outdoor return air temperature sensor; 11-indoor heat exchanger coil temperature sensor; 12-indoor return air temperature sensor; 13-outdoor fan; 14-indoor fan.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, an air conditioning system includes a refrigerant circulation circuit including a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttle member 4, a shutoff valve 5, an indoor heat exchanger 6, and a gas-liquid separator 7. And an outdoor fan 13 is arranged on the outdoor heat exchanger 3. An indoor fan 14 is arranged on the indoor heat exchanger 6. An exhaust temperature sensor 8 is arranged at an exhaust port of the compressor 1; an outdoor heat exchanger coil pipe temperature sensor 9 and an outdoor return air temperature sensor 10 are arranged on the outdoor heat exchanger 3; and an indoor heat exchanger coil pipe temperature sensor 11 and an indoor return air temperature sensor 12 are arranged on the indoor heat exchanger 6.
A self-cleaning control method of the air conditioning system comprises the following steps:
1) detecting the indoor environment temperature T1 through an indoor return air temperature sensor; detecting the outdoor environment temperature T4 through an outdoor return air temperature sensor, and determining the target discharge superheat Tg1 of the compressor corresponding to the T4;
2) starting a preheating process, and timing: starting a refrigeration mode, wherein the frequency of a compressor is P1, an indoor fan is the lowest gear, and an outdoor fan is started;
3) detecting a compressor discharge temperature T5 by a discharge temperature sensor; detecting the temperature T3 of the coil of the outdoor heat exchanger by an outdoor heat exchanger coil temperature sensor; detecting the temperature Tp of the coil pipe of the indoor heat exchanger by using a coil pipe temperature sensor of the indoor heat exchanger; calculating to obtain the superheat degree Tg = T5-T3 of the compressor exhaust gas; and an air condensation target threshold Δ Ta = T1-Tp;
4) when Tg is less than Tg1 or delta Ta is less than 17 ℃, the next step is carried out; otherwise, returning to the previous step; wherein: tg1 is the target superheat degree for normal operation of the compressor;
5) the frequency of the compressor is increased by 2Hz every 30s, and when Tg is more than Tg1 or delta Ta is more than 17 ℃, the current frequency is maintained; or the frequency does not rise any more when reaching the allowable upper limit value;
6) continuously detecting T5 and T3 to obtain Tg;
7) if Tg is more than Tg1, and the duration time reaches the accumulated time 1, or the preheating duration time reaches the accumulated time 2, turning to the next step, or returning to the previous step;
8) exiting the preheating process, entering the frosting process, and timing: keeping the refrigeration mode and the current compressor frequency, closing the indoor fan and keeping the outdoor fan on;
9) continuously detecting T5 and T3 to obtain Tg;
10) if Tg is less than Tg2 and the duration reaches the accumulated time 3, or the duration of the frosting process reaches the accumulated time 4, turning to the next step, or else, returning to the previous step; wherein: tg2 is the lower limit of the superheat degree of the normal operation of the compressor, and Tg2 is less than Tg 1;
11) exiting the frosting process, entering a drying process I, and timing: the frequency of the compressor is operated according to P2, and the four-way valve of the unit is switched to be converted into a heating mode; the indoor fan is kept closed; the outdoor fan is kept on;
12) detecting Tp;
13) if Tp = Tp1 and the duration reaches the accumulated time 5, or the drying duration reaches the accumulated time 6, turning to the next step, or returning to the previous step; wherein: tp1 is the set indoor coil target temperature value;
14) exiting the drying process I, entering a drying process II, and timing: keeping the heating mode, and keeping the frequency of the compressor to be P2 running; the indoor fan operates according to the lowest gear; the outdoor fan is kept on;
15) detecting T5 and Tp;
16) if T5 is more than 100 ℃ or Tp is more than 50 ℃, reducing the frequency of the compressor by 4Hz every 20s, and not reducing the frequency when the frequency is reduced to a lower limit value allowed by the frequency, otherwise, maintaining the current frequency of the compressor and returning to the previous step;
17) if T5 > 115 ℃ or TP > 60 ℃ for 5s, switching to step 19), otherwise, switching to step 15);
18) when Tp is more than Tp2 and the duration reaches the accumulated time 7, or the drying duration reaches the accumulated time 8, turning to the next step, or returning to the previous step; wherein: tp2 is the set indoor coil pipe target temperature value, and TP1 < TP 2;
19) exiting the drying process II, entering a drying process III, and timing; the compressor is stopped, and the indoor fan keeps the lowest-grade operation; the outdoor fan is closed;
20) and when the drying duration reaches the accumulated time 9, quitting the drying process III and ending the control.
Description of the relevant parameters:
1. compressor target discharge superheat Tg 1: the target superheat degree for normal operation of the compressor is increased along with the increase of the temperature T4 and is between 30 and 50 ℃.
2. Compressor target discharge superheat Tg 2: the lower limit of superheat degree for normal operation of the compressor is between 5 and 20 ℃.
3. Compressor frequency P1: the initial operation frequency of the compressor is between 20 Hz and 60Hz in the preheating process.
4. Compressor frequency P2: the operation frequency of the compressor is between 30 Hz and 50Hz in the drying process.
5. Indoor coil first target temperature value Tp 1: the temperature of the heat exchanger during defrosting of the evaporator is between 20 and 30 ℃.
6. Indoor coil second target temperature value Tp 2: the temperature of the heat exchanger is between 30 and 50 ℃ when the evaporator is dried.
7. The cumulative time 1 to the cumulative time 9 are all set values between 1 to 12 minutes.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (6)
1. A self-cleaning 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, a stop valve, an indoor heat exchanger and a gas-liquid separator, wherein an exhaust temperature sensor is arranged at an exhaust port of the compressor; an outdoor heat exchanger coil pipe temperature sensor and an outdoor return air temperature sensor are arranged on the outdoor heat exchanger; an indoor heat exchanger coil pipe temperature sensor and an indoor return air temperature sensor are arranged on the indoor heat exchanger; the method is characterized in that: the control method comprises the following steps:
1) detecting the indoor environment temperature T1 through an indoor return air temperature sensor; detecting the outdoor environment temperature T4 through an outdoor return air temperature sensor, and determining the target discharge superheat Tg1 of the compressor corresponding to the T4;
2) starting a preheating process, and timing: starting a refrigeration mode, wherein the frequency of a compressor is P1;
3) detecting a compressor discharge temperature T5 by a discharge temperature sensor; detecting the temperature T3 of the coil of the outdoor heat exchanger by an outdoor heat exchanger coil temperature sensor; detecting the temperature Tp of the coil pipe of the indoor heat exchanger by using a coil pipe temperature sensor of the indoor heat exchanger; calculating to obtain the superheat degree Tg = T5-T3 of the compressor exhaust gas; and an air condensation target threshold Δ Ta = T1-Tp;
4) when Tg is less than Tg1 or delta Ta is less than 17 ℃, the next step is carried out; otherwise, returning to the previous step; wherein: tg1 is the target superheat degree for normal operation of the compressor;
5) the frequency of the compressor is increased by 2Hz every 30s, and when Tg is more than Tg1 or delta Ta is more than 17 ℃, the current frequency is maintained; or the frequency does not rise any more when reaching the allowable upper limit value;
6) continuously detecting T5 and T3 to obtain Tg;
7) if Tg is more than Tg1, and the duration time reaches the accumulated time 1, or the preheating duration time reaches the accumulated time 2, turning to the next step, or returning to the previous step;
8) exiting the preheating process, entering the frosting process, and timing: maintaining a cooling mode and a current compressor frequency;
9) continuously detecting T5 and T3 to obtain Tg;
10) if Tg is less than Tg2 and the duration reaches the accumulated time 3, or the duration of the frosting process reaches the accumulated time 4, turning to the next step, or else, returning to the previous step; wherein: tg2 is the lower limit of the superheat degree of the normal operation of the compressor, and Tg2 is less than Tg 1;
11) exiting the frosting process, entering a drying process I, and timing: the frequency of the compressor is operated according to P2, and the four-way valve of the unit is switched to be converted into a heating mode;
12) detecting Tp;
13) if Tp = Tp1 and the duration reaches the accumulated time 5, or the drying duration reaches the accumulated time 6, turning to the next step, or returning to the previous step; wherein: tp1 is a set indoor coil first target temperature value;
14) exiting the drying process I, entering a drying process II, and timing: keeping the heating mode, and keeping the frequency of the compressor to be P2 running;
15) detecting T5 and Tp;
16) if T5 is more than 100 ℃ or Tp is more than 50 ℃, reducing the frequency of the compressor by 4Hz every 20s, and not reducing the frequency when the frequency is reduced to a lower limit value allowed by the frequency, otherwise, maintaining the current frequency of the compressor and returning to the previous step;
17) if T5 > 115 ℃ or TP > 60 ℃ for 5s, switching to step 19), otherwise, switching to step 15);
18) when Tp is more than Tp2 and the duration reaches the accumulated time 7, or the drying duration reaches the accumulated time 8, turning to the next step, or returning to the previous step; wherein: tp2 is the second target temperature value of indoor coil, and TP1 < TP 2;
19) exiting the drying process II, entering a drying process III, and timing; stopping the compressor;
20) and when the drying duration reaches the accumulated time 9, quitting the drying process III and ending the control.
2. An air conditioner self-cleaning control method according to claim 1, characterized in that: in the step 2), the indoor fan is the lowest gear, and the outdoor fan is started.
3. An air conditioner self-cleaning control method according to claim 1, characterized in that: and 8), closing the indoor fan and keeping the outdoor fan on.
4. An air conditioner self-cleaning control method according to claim 1, characterized in that: in the step 11), the indoor fan is kept closed; the outdoor fan remains on.
5. An air conditioner self-cleaning control method according to claim 1, characterized in that: in the step 14), the indoor fan operates according to the lowest gear; the outdoor fan remains on.
6. An air conditioner self-cleaning control method according to claim 1, characterized in that: in the step 19), the indoor fan keeps the lowest gear running; the outdoor fan is turned off.
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| CN111594982B (en) * | 2020-03-03 | 2021-11-23 | 青岛海尔空调器有限总公司 | Control method and control device for cleaning air conditioner and air conditioner |
| CN111380152B (en) * | 2020-03-27 | 2021-12-17 | 广东美的制冷设备有限公司 | High-temperature sterilization control method and device, air conditioner and storage medium |
| CN111578415B (en) * | 2020-05-25 | 2021-12-21 | 广东美的制冷设备有限公司 | Radiation air conditioner and compressor protection control method and device |
| CN111750484A (en) * | 2020-06-19 | 2020-10-09 | 宁波奥克斯电气股份有限公司 | Air conditioner, multi-online degerming control method and device and multi-online system |
| CN114294739B (en) * | 2021-12-30 | 2023-01-31 | 海信（广东）空调有限公司 | Air conditioner and self-cleaning method thereof |
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| CN106556107A (en) * | 2016-11-11 | 2017-04-05 | 青岛海尔空调器有限总公司 | Air-conditioning heat exchanger self cleaning method |
| CN106679111B (en) * | 2017-01-23 | 2020-04-14 | 深圳创维空调科技有限公司 | Automatic cleaning treatment method and system for heat exchanger of air conditioner |
| JP6340111B1 (en) * | 2017-04-28 | 2018-06-06 | 日立ジョンソンコントロールズ空調株式会社 | Air conditioner indoor unit |
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| CN109489189B (en) * | 2017-09-08 | 2020-10-23 | 奥克斯空调股份有限公司 | Cleaning method of air conditioner |
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