WO2023279613A1 - Procédé de commande pour mettre en œuvre une fonction d'auto-nettoyage dans un tuyau spiralé d'échangeur de chaleur extérieur - Google Patents

Procédé de commande pour mettre en œuvre une fonction d'auto-nettoyage dans un tuyau spiralé d'échangeur de chaleur extérieur Download PDF

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Publication number
WO2023279613A1
WO2023279613A1 PCT/CN2021/129815 CN2021129815W WO2023279613A1 WO 2023279613 A1 WO2023279613 A1 WO 2023279613A1 CN 2021129815 W CN2021129815 W CN 2021129815W WO 2023279613 A1 WO2023279613 A1 WO 2023279613A1
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WIPO (PCT)
Prior art keywords
self
air conditioner
heat exchanger
outdoor heat
cleaning
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PCT/CN2021/129815
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English (en)
Chinese (zh)
Inventor
罗荣邦
王明强
Original Assignee
青岛海尔空调器有限总公司
青岛海尔空调电子有限公司
海尔智家股份有限公司
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Publication of WO2023279613A1 publication Critical patent/WO2023279613A1/fr

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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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • 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
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G15/00—Details
    • F28G15/003—Control arrangements
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the invention relates to the technical field of self-cleaning of air conditioners, in particular to a method for controlling self-cleaning in tubes of outdoor heat exchangers.
  • Some of the current air conditioners have the self-cleaning function of the inner and outer units. Taking the self-cleaning process of the outdoor heat exchanger as an example, when the self-cleaning function is executed, the frosting and defrosting operations on the outer surface of the coil of the outdoor heat exchanger are realized through the switching of cooling and heating modes combined with the opening and closing of the outdoor fan , so that when the frost layer melts, the dirt on the surface of the coil is washed away.
  • the current self-cleaning function is limited to cleaning the outer surface of the outdoor coil, but cannot clean the inside of the coil.
  • the inside of the outdoor coil will accumulate impurities and refrigerating machine oil generated during the operation of the air conditioner, resulting in heat exchange. The effect becomes worse, so it is especially necessary to self-clean the interior of the outdoor coil.
  • the cleaning method is fixed, and the degree of self-cleaning cannot be intelligently controlled according to the dirtiness of the outdoor coil.
  • the self-cleaning time is long, which affects the normal user experience, and the self-cleaning is not thorough when the outer surface of the outdoor coil is seriously dirty.
  • the application provides a self-cleaning control method in the tube of the outdoor heat exchanger, which is applied to An air conditioner
  • the air conditioner includes a compressor connected by a refrigerant pipeline, a four-way valve, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger
  • the air conditioner also includes a recovery pipeline, and the recovery pipeline One end of the recovery pipeline communicates with the inlet of the outdoor heat exchanger, and the other end of the recovery pipeline communicates with the suction port of the compressor.
  • An on-off valve is set on the recovery pipeline, and the on-off valve is normally closed valve,
  • control methods include:
  • the degree of dirty clogging includes mild dirty clogging, moderate dirty clogging and severe dirty clogging
  • the self-cleaning mode in the pipe includes mild self-cleaning mode, moderate self-cleaning mode and deep self-cleaning mode
  • the mild self-cleaning mode includes: controlling the air conditioner to run in the heating mode; adjusting the operating parameters of the air conditioner so that the coil temperature of the outdoor heat exchanger is less than or equal to the first preset temperature; After the coil temperature is less than or equal to the first preset temperature and lasts for a first preset time, control the air conditioner to switch to cooling mode; control the on-off valve to open, and last for a second preset time;
  • the moderate self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; adjusting the operating parameters of the air conditioner so that the coil temperature of the outdoor heat exchanger is less than or equal to the second preset temperature; After the coil temperature is less than or equal to the second preset temperature and lasts for a third preset time, control the air conditioner to switch to cooling mode; control the on-off valve to open, and last for a fourth preset time;
  • the deep self-cleaning mode includes: repeating the following steps twice: controlling the air conditioner to run in heating mode; adjusting the operating parameters of the air conditioner so that the coil temperature of the outdoor heat exchanger is less than or equal to the third Preset temperature; when the coil temperature is less than or equal to the third preset temperature and lasts for a fifth preset time, control the air conditioner to switch to cooling mode; control the on-off valve to open, and last for a sixth preset duration;
  • the operating parameters include one or more of the operating frequency of the compressor, the opening of the throttling device, the rotational speed of the indoor fan, and the rotational speed of the outdoor fan, the first preset temperature, the Both the second preset temperature and the third preset temperature are less than or equal to the freezing temperature of the refrigerating machine oil.
  • control the compressor After controlling the air conditioner to switch to cooling mode, control the compressor to adjust to the highest limit frequency corresponding to the outdoor ambient temperature;
  • controlling the air conditioner to switch to cooling mode controlling the indoor fan to stop running;
  • the step of adjusting the operating parameters of the air conditioner includes: controlling the compressor to adjust to a first self-cleaning frequency, controlling the outdoor fan to run at a minimum wind speed, and controlling the indoor fan to run at a first preset speed; and/or or
  • the step of adjusting the operating parameters of the air conditioner further includes: adjusting the opening degree of the throttling device; and/or
  • the throttling device is an electronic expansion valve
  • the air conditioner is controlled to switch to cooling mode
  • the throttling device is controlled to close to a minimum opening.
  • control method for in-pipe self-cleaning of the above-mentioned outdoor heat exchanger further includes:
  • the mild self-cleaning mode is exited, and the air conditioner is controlled to return to the operating state before entering the mild self-cleaning mode.
  • control the compressor After controlling the air conditioner to switch to cooling mode, control the compressor to adjust to the highest limit frequency corresponding to the outdoor ambient temperature;
  • controlling the air conditioner to switch to cooling mode controlling the indoor fan to stop running;
  • the step of adjusting the operating parameters of the air conditioner includes: controlling the compressor to adjust to a second self-cleaning frequency, controlling the outdoor fan to run at the lowest speed, and controlling the indoor fan to run at the second preset speed; and/or or
  • the step of adjusting the operating parameters of the air conditioner further includes: adjusting the opening degree of the throttling device; and/or
  • the throttling device is an electronic expansion valve
  • the air conditioner is controlled to switch to cooling mode
  • the throttling device is controlled to close to a minimum opening.
  • control method for in-pipe self-cleaning of the above-mentioned outdoor heat exchanger further includes:
  • control the compressor After controlling the air conditioner to switch to cooling mode, control the compressor to adjust to the highest limit frequency corresponding to the outdoor ambient temperature;
  • controlling the air conditioner to switch to cooling mode controlling the indoor fan to stop running;
  • the step of adjusting the operating parameters of the air conditioner includes: controlling the compressor to adjust to a third self-cleaning frequency, controlling the outdoor fan to operate at the lowest rotational speed, and controlling the indoor fan to operate at the third preset rotational speed; and/or or
  • the step of adjusting the operating parameters of the air conditioner further includes: adjusting the opening degree of the throttling device; and/or
  • the throttling device is an electronic expansion valve
  • the air conditioner is controlled to switch to cooling mode
  • the throttling device is controlled to close to a minimum opening
  • the deep self-cleaning mode further includes: after controlling the on-off valve to open for the first time and continuing for the sixth preset duration, first controlling the air conditioner to run in a heating mode for a seventh preset duration .
  • control method for in-pipe self-cleaning of the above-mentioned outdoor heat exchanger further includes:
  • the deep self-cleaning mode is exited, and the air conditioner is controlled to return to the operating state before entering the deep self-cleaning mode.
  • the operating data includes the cumulative operating time of the air conditioner and the coil temperature of the outdoor heat exchanger, "acquire the temperature of the air conditioner
  • the step of running data further includes:
  • the step of "judging the degree of fouling and clogging of the outdoor heat exchanger based on the operating data" further includes:
  • the throttling device is an electronic expansion valve
  • the operating data includes the actual opening of the electronic expansion valve and the actual discharge of the compressor.
  • the step of "obtaining the operating data of the air conditioner" further includes:
  • the step of "judging the degree of fouling and clogging of the outdoor heat exchanger based on the operating data" further includes:
  • the target opening degree is determined based on the target exhaust temperature and the outdoor ambient temperature.
  • the throttling device is a capillary tube
  • the operating data includes the actual exhaust temperature
  • the step of "obtaining the operating data of the air conditioner" further includes :
  • the step of "judging the degree of fouling and clogging of the outdoor heat exchanger based on the operating data" further includes:
  • the control method of the present application can not only realize the self-cleaning of the outdoor heat exchanger in the tube, but also Based on the degree of fouling and blockage of the outdoor heat exchanger, a suitable in-pipe self-cleaning mode can be implemented to achieve a more intelligent in-pipe self-cleaning.
  • Fig. 1 is the system diagram of the air conditioner of the present application in heating mode
  • Fig. 2 is the system diagram of the air conditioner of the present application in cooling mode
  • Fig. 3 is the flowchart of the self-cleaning control method in the tube of the outdoor heat exchanger of the present application
  • Fig. 4 is a logic diagram of a possible implementation process of the method for controlling self-cleaning in tubes of an outdoor heat exchanger of the present application.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • FIG. 1 is a system diagram of the air conditioner of the present application in cooling mode.
  • the air conditioner includes a compressor 1 , a four-way valve 2 , an outdoor heat exchanger 3 , a throttling device 4 , an indoor heat exchanger 5 and a liquid accumulator 9 .
  • the exhaust port of the compressor 1 is connected with the P port of the four-way valve 2 through the refrigerant pipeline 6, and the E port of the four-way valve 2 is connected with the inlet of the indoor heat exchanger 5 through the refrigerant pipeline 6.
  • the outlet communicates with one port of the throttling device 4 through the refrigerant pipeline 6, and the other port of the throttling device 4 communicates with the inlet of the outdoor heat exchanger 3 through the refrigerant pipeline 6, and the outlet of the outdoor heat exchanger 3 passes through the refrigerant pipeline 6 is connected with the C port of the four-way valve 2, the S port of the four-way valve 2 is connected with the inlet of the accumulator 9 through the refrigerant pipeline 6, and the outlet of the accumulator 9 is connected with the suction port of the compressor 1 through the pipeline .
  • the throttling device 4 can be a capillary tube or an electronic expansion valve. There is a filter screen inside the liquid reservoir 9.
  • the liquid reservoir 9 can store refrigerant, separate gas and liquid of refrigerant, filter oil, eliminate noise, and buffer refrigerant.
  • the air conditioner also includes a recovery pipeline 7 and an on-off valve 8.
  • the recovery pipeline 7 adopts a copper tube with a smooth inner wall.
  • the on-off valve 8 is preferably a solenoid valve.
  • the solenoid valve is a normally closed valve and is arranged on the recovery pipeline 7.
  • the solenoid valve communicates with the controller of the air conditioner to receive the opening and closing signals issued by the controller.
  • the on-off valve 8 can also be an electronically controlled valve such as an electronic expansion valve.
  • control method for self-cleaning in the pipe of the outdoor heat exchanger in this embodiment will be described below in conjunction with the structure of the above-mentioned air conditioner, but those skilled in the art can understand that the specific structural composition of the air conditioner is not static, and those skilled in the art can understand It can be adjusted, for example, components can be added or deleted on the basis of the structure of the above-mentioned air conditioner.
  • FIG. 2 is a system diagram of the air conditioner of the present application in cooling mode
  • FIG. 3 is a flow chart of the control method for self-cleaning in pipes of the outdoor heat exchanger of the present application.
  • the self-cleaning control method in the tube of the outdoor heat exchanger of the present application includes:
  • the operating data of the air conditioner includes the accumulated operating time, the coil temperature of the outdoor heat exchanger, the actual opening of the throttling device (when the throttling device is an electronic expansion valve), the actual discharge of the compressor Air temperature, etc., during the operation of the air conditioner, obtain one or more of the above operation data.
  • the above-mentioned acquisition methods of the operation data belong to conventional means in the art, and will not be repeated here.
  • the range of the operating data or the size of the operating data is determined through reasonable calculation of the above operating data and comparison with the preset threshold, and then the degree of dirty blockage of the outdoor heat exchanger is determined. .
  • the degree of dirty clogging in this application can be divided into mild dirty clogging, moderate dirty clogging and severe dirty clogging.
  • the self-cleaning mode in the pipe includes the mild self-cleaning mode corresponding to each degree of dirty clogging , moderate self-cleaning mode and deep self-cleaning mode.
  • the air conditioner when it is judged that the degree of dirty blockage of the outdoor heat exchanger is mild, the air conditioner is controlled to execute a mild self-cleaning mode; when it is judged that the degree of dirty blockage of the outdoor heat exchanger is moderately dirty, The air conditioner is controlled to execute the moderate self-cleaning mode; when it is judged that the degree of dirty clogging of the outdoor heat exchanger is severe, the air conditioner is controlled to execute the deep self-cleaning mode.
  • the control method of the present application can not only realize the self-cleaning of the outdoor heat exchanger in the pipe. It is also able to perform a corresponding degree of in-pipe self-cleaning mode based on the degree of dirt and blockage of the outdoor heat exchanger, so that the self-cleaning effect can be adapted to the degree of dirt and clogging, realizing more intelligent self-cleaning in the pipe.
  • the throttling device may be a capillary tube or an electronic expansion valve
  • the operating data of the air conditioner includes the cumulative operating time of the air conditioner and the coil temperature of the outdoor heat exchanger.
  • the step of "obtaining the operating data of the air conditioner” further includes :
  • the cumulative running time can be any value in 15h-40h, and in this application it is 20h.
  • the cumulative running time of the air conditioner reaches 20 hours, it indicates that the outdoor heat exchanger may be dirty and clogged, and the degree of dirty clogging needs to be judged.
  • the coil temperature of the outdoor heat exchanger in the next running process of the air conditioner is obtained for judgment.
  • the first period of time and the second period of time can take any value in 10-30min, for example, the first period of time and the second period of time are both 15min, that is to say, when the cumulative running time reaches 20h, the two 15min periods Take the average value of the coil temperature as the first average value and the second average value.
  • the average value of the coil temperature in the first 15 minutes of the 1 hour and the coil temperature in the last 15 minutes was used as the first average value and the second average value.
  • the specific way of obtaining the first average value and the second average value is not the only one. Just average. For example, after the accumulative running time reaches 20 hours, the average value of the coil temperature within two consecutive 15 minutes may be acquired as the first average value and the second average value.
  • the step of "judging the degree of fouling and clogging of the outdoor heat exchanger based on the operating data" further includes:
  • the first threshold is smaller than the second threshold
  • the first threshold may be any value in the range of 1-3°C
  • the second threshold may be any value in the range of 3-5°C.
  • the first average value is Tp1
  • the second average value is Tp2
  • the first threshold value is 2°C
  • the second threshold value is 4°C
  • the process of judging the degree of dirty blockage of the outdoor heat exchanger is similar to that in the heating mode, and will not be repeated here.
  • the throttling device is an electronic expansion valve
  • the operating data includes the actual opening of the electronic expansion valve and the actual exhaust temperature of the compressor.
  • the step of "obtaining the operating data of the air conditioner" further includes:
  • the actual discharge temperature of the compressor is acquired through a temperature sensor provided at the discharge port of the compressor, and the acquisition method is a conventional means in the art, and will not be repeated here.
  • the target exhaust temperature is a commonly used control parameter in air conditioner control.
  • the target exhaust temperature is determined first, and then the actual exhaust temperature is adjusted by controlling the opening of the electronic expansion valve to make the actual exhaust temperature reach Or as close as possible to the target exhaust temperature.
  • there are many methods for determining the target exhaust temperature in the prior art such as determining based on a comparison table or a fitting formula between the target exhaust temperature and the outdoor ambient temperature.
  • the actual exhaust temperature is controlled by adjusting the opening of the expansion valve. When the actual exhaust temperature reaches the target exhaust temperature, the actual opening of the electronic expansion valve at this time is obtained.
  • the step of "judging the degree of dirtyness and blockage of the outdoor heat exchanger based on the operating data" further includes:
  • Calculate the difference between the actual opening and the target opening and calculate the ratio between the difference and the target opening; when the ratio is greater than the third threshold and less than or equal to the fourth threshold, it is judged that the outdoor heat exchanger is slightly dirty blockage; when the ratio is greater than the fourth threshold and less than or equal to the fifth threshold, it is judged that the outdoor heat exchanger is moderately dirty; when the ratio is greater than the fifth threshold, it is judged that the outdoor heat exchanger is severely dirty;
  • Bset is the target opening, that is, the ideal opening when there is no dirty blockage
  • Td is the target exhaust temperature
  • Tao is the outdoor ambient temperature
  • K is a coefficient
  • the coefficient K can be determined based on experiments. It can be seen from the above that when the outdoor heat exchanger is not dirty, each outdoor ambient temperature corresponds to a target exhaust temperature, and the target exhaust temperature together with the outdoor ambient temperature determines the target opening of the electronic expansion valve.
  • the current method of controlling the opening of the electronic expansion valve based on the target exhaust temperature is usually: when the exhaust temperature is higher than the target exhaust temperature ⁇ open the electronic expansion valve ⁇ increase the amount of refrigerant, reduce the temperature of the refrigerant in the evaporator after heat exchange ⁇ reduce the compression The machine suction temperature and exhaust temperature.
  • the discharge temperature is lower than the target discharge temperature ⁇ close the electronic expansion valve ⁇ reduce the amount of refrigerant, increase the temperature of the refrigerant in the evaporator after heat exchange ⁇ increase the compressor suction temperature and discharge temperature.
  • the opening degree of the electronic expansion valve is B
  • the target opening degree of the electronic expansion valve at the current outdoor ambient temperature is Bset.
  • the difference ⁇ B B-Bset, and then calculate the ratio of the difference ⁇ B to the target opening Bset, and judge the range of the ratio.
  • the third threshold, the fourth threshold and the fifth threshold increase sequentially, wherein the third threshold is any value in 0.9-1.05, the fourth threshold is any value in 1.05-1.15, and the fifth threshold is 1.15 Any value from -1.35.
  • the third threshold is 1, the fourth threshold is 1.1, and the fifth threshold is 1.2 as an example.
  • ⁇ B/Bset ⁇ 1 it is considered that the degree of dirty blockage of the outdoor heat exchanger is not large, and self-cleaning is not required; if 1 ⁇ B/Bset ⁇ 1.1, it is considered that the outdoor heat exchanger is slightly dirty; if 1.1 ⁇ If ⁇ B/Bset ⁇ 1.2, the outdoor heat exchanger is considered to be moderately dirty; if ⁇ B/Bset>1.2, the outdoor heat exchanger is considered to be severely dirty.
  • the throttling device is a capillary tube
  • the operating data includes the actual exhaust temperature.
  • the step of "obtaining the operating data of the air conditioner" further includes:
  • the actual discharge temperature can be obtained based on the temperature sensor installed at the discharge port of the compressor.
  • the step of "judging the degree of dirtyness and blockage of the outdoor heat exchanger based on the operating data" further includes:
  • the method of determining the target exhaust gas temperature is the same as that in Embodiment 2, which will not be repeated here. Since the opening of the capillary cannot be adjusted, the more dirty the outdoor heat exchanger is, the worse the heat exchange effect will be, and the higher the suction temperature and discharge temperature of the compressor will be. Therefore, it can be determined whether the outdoor heat exchanger is dirty and the degree of dirty blocking can be determined by comparing the actual exhaust temperature with the target exhaust temperature.
  • the air conditioner After the air conditioner starts and runs stably, first obtain the actual exhaust temperature T, then calculate the difference ⁇ T between the actual exhaust temperature T and the target exhaust temperature Td, and calculate the difference between the difference ⁇ T and the target exhaust temperature The ratio of Td; finally judge the range of the ratio, so as to determine the degree of dirty blockage.
  • the sixth threshold, the seventh threshold and the eighth threshold increase sequentially, wherein the sixth threshold is any value in 0.9-1.05, the seventh threshold is any value in 1.05-1.15, and the eighth threshold is 1.15 Any value from -1.35.
  • the sixth threshold is 1, the seventh threshold is 1.1, and the eighth threshold is 1.2 as an example.
  • ⁇ T/Td ⁇ 1 it is considered that the degree of dirty blockage of the outdoor heat exchanger is not large, and self-cleaning is not required; if 1 ⁇ T/Td ⁇ 1.1, it is considered that the outdoor heat exchanger is slightly dirty; if 1.1 ⁇ If ⁇ T/Td ⁇ 1.2, the outdoor heat exchanger is considered to be moderately dirty; if ⁇ T/Td>1.2, the outdoor heat exchanger is considered to be severely dirty.
  • the control methods corresponding to the self-cleaning modes in each tube when the throttling device is a capillary tube can be obtained by adjusting the following self-cleaning modes in each tube.
  • all the following control methods related to the throttling device can be omitted, so as to obtain the control method of the self-cleaning mode in the tube corresponding to the capillary tube.
  • the mild self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; adjusting the operating parameters of the air conditioner so that the coil temperature of the outdoor heat exchanger is less than or equal to the first Preset temperature; when the coil temperature is less than or equal to the first preset temperature and lasts for a first preset time, control the air conditioner to switch to cooling mode; control the on-off valve to open and last for a second preset time Set duration.
  • the operating parameters include the operating frequency of the compressor, the opening degree of the throttling device, the rotating speed of the indoor fan and the rotating speed of the outdoor fan. specifically,
  • the air conditioner is controlled to operate in a heating mode.
  • the switch between the operating modes of the air conditioner can be controlled by controlling the power on and off of the four-way valve. For example, when the four-way valve is powered on, the air conditioner operates in heating mode, and when the four-way valve is powered off, the air conditioner operates in cooling mode. model.
  • the air conditioner after entering the mild self-cleaning mode, if the air conditioner is running in the heating mode, no adjustment is required, and the air conditioner is controlled to continue running; if the air conditioner is running in the non-heating mode, the air conditioner is controlled to switch to heating Hot mode operation.
  • the first self-cleaning frequency is a frequency determined in advance through experiments, for example, it may be determined based on the correspondence between the outdoor ambient temperature and the first self-cleaning frequency in Table 1 below.
  • the compressor operates at the first self-cleaning frequency, it facilitates the implementation of the subsequent control process.
  • the first self-cleaning frequency (Hz) Tao ⁇ -20 Maximum frequency of outer ring temperature limit frequency -5 -20 ⁇ Tao ⁇ -10 Maximum frequency of outer ring temperature limit frequency -5 -10 ⁇ Tao ⁇ -5 Maximum frequency of outer ring temperature limit frequency -5 -5 ⁇ Tao ⁇ 0 Maximum frequency of outer ring temperature limit frequency 0 ⁇ Tao ⁇ 5
  • Maximum frequency of outer ring temperature limit frequency 5 ⁇ Tao ⁇ 10 The highest frequency of the outer ring temperature limit frequency +5 10 ⁇ Tao ⁇ 16
  • the outdoor fan is first controlled to run at the lowest speed to reduce the heat exchange effect between the outdoor heat exchanger and the air, thereby speeding up the cooling of the outdoor disk.
  • the temperature reduction speed of the tube improves the self-cleaning efficiency in the tube.
  • the first preset speed can be a low speed in the speed of the indoor fan, such as 400r/min-700r/min, and this application can be 500r/min, because the dirty blockage of the outdoor heat exchanger is not serious , and the air conditioner is adjusting the indoor ambient temperature before entering the mild self-cleaning mode, so on the basis of ensuring the self-cleaning effect, by controlling the outdoor fan to run at the lowest speed, and the indoor fan to run at the first preset speed , to ensure a certain degree of indoor comfort.
  • the temperature sensor can detect the coil temperature of the outdoor heat exchanger, and dynamically adjust the opening degree of the electronic expansion valve, so that the coil temperature of the outdoor heat exchanger is less than or equal to the first preset temperature.
  • the first preset temperature is higher than the freezing temperature of the refrigerator oil. In this way, since the freezing points of the refrigerator oil and the refrigerant are much lower than the freezing point of the oil, the first preset temperature is set to be higher than the freezing temperature of the refrigerator oil.
  • the oil stain is first solidified and precipitated, while the refrigerating machine oil and the refrigerant circulate normally.
  • Different types of refrigerating machine oil have different freezing points, so the specific value of the first preset temperature is determined based on the type of refrigerating machine oil used. For example, to ensure fluidity, the freezing point of refrigerating machine oil is below -50°C, so The first preset temperature in this application may be set at -1°C to -10°C, and in this application, the first preset temperature may be -5°C.
  • the coil temperature of the outdoor heat exchanger is less than or equal to the first preset temperature as the control purpose, and by adjusting the opening degree of the electronic expansion valve (such as PID adjustment, etc.), the coil temperature of the outdoor heat exchanger is always at The state of being less than or equal to the first preset temperature.
  • the coil temperature of the outdoor heat exchanger can also be made to be less than or equal to the first preset temperature by adjusting the opening degree of the electronic expansion valve to a fixed opening degree.
  • the air conditioner is controlled to switch to the cooling mode.
  • the first preset duration may be any value in 5-15 minutes.
  • the first preset time length in this embodiment is 10 minutes.
  • the operation of the control room fan is stopped. Specifically, when the cooling mode is running, the outlet air temperature of the indoor unit gradually decreases, which will bring bad user experience to the user. At this time, the fan in the control room stops running after running for 30 seconds, which can prevent the temperature of the outlet air from being too low and affect the user experience.
  • the cooling mode is running
  • the outlet air temperature of the indoor unit gradually decreases, which will bring bad user experience to the user.
  • the fan in the control room stops running after running for 30 seconds, which can prevent the temperature of the outlet air from being too low and affect the user experience.
  • those skilled in the art can adjust the above 30s, such as adjusting to any value in 10s-1min.
  • the on-off valve is controlled to be opened, and the throttling device is closed to a minimum opening degree for a second preset time period.
  • Control the throttling device to close to the minimum opening degree that is, the state where the opening degree is 0, the throttling device realizes complete throttling, and the refrigerant cannot flow through.
  • the second preset duration can be any value in 3min-10min, preferably 5min in this application.
  • the high-temperature and high-pressure refrigerant discharged from the compressor flows through the outdoor heat exchanger, and the high-temperature and high-pressure refrigerant quickly impacts the coil of the outdoor heat exchanger, and the oil that is temporarily stored inside the coil is melted.
  • the high-temperature refrigerant directly flows back to the liquid receiver through the recovery pipeline to realize recovery and filtration, so as to achieve the purpose of self-cleaning in the tube of the outdoor heat exchanger.
  • the mild self-cleaning mode further includes: after the step of controlling the air conditioner to switch to cooling mode, controlling the compressor to adjust to the highest limit frequency corresponding to the outdoor ambient temperature.
  • the operating frequency of the compressor is affected by the outdoor ambient temperature and cannot be increased indefinitely, otherwise the phenomenon of high temperature protection shutdown of the compressor will easily occur, which will have a negative impact on the life of the compressor. Therefore, the compressors are all equipped with a protection mechanism. Under different outdoor ambient temperatures, the corresponding maximum frequency limit is set.
  • the rating of the compressor is adjusted to the current outdoor ambient temperature. Under this frequency limit, the compressor can increase the temperature and pressure of the refrigerant in the shortest time, thereby improving the self-cleaning effect.
  • the manner of obtaining the outdoor ambient temperature is a conventional means in the field, and will not be repeated here.
  • the method further includes: when entering the mild self-cleaning mode, turning off the outdoor antifreeze protection function and the outdoor ambient temperature frequency limiting function. Since the coil temperature of the outdoor heat exchanger needs to be lowered to a lower value, in order to reach this condition as soon as possible, the compressor needs to run at high frequency. function to ensure the smooth execution of this method. But other protection functions are turned on as usual, such as compressor exhaust protection and current overload protection, and other functions remain turned on to prevent adverse effects on the life of the air conditioner.
  • the specific control process of the mild self-cleaning mode is not unique, and those skilled in the art can adjust the control method.
  • the coil temperature of the outdoor heat exchanger can be kept at or below the first preset temperature, the operation frequency of the compressor, the opening degree of the electronic expansion valve, the speed of the indoor fan and the One or more of the rotational speeds of the outdoor fans are omitted.
  • the method further includes: exiting the mild self-cleaning mode after the on-off valve is opened and the throttling device is closed to the minimum opening for a second preset period of time, and the air conditioner is controlled to return to the mild self-cleaning mode. operating status prior to self-cleaning mode.
  • the on-off valve is opened and the throttling device is closed for 5 minutes, the high-temperature and high-pressure refrigerant has circulated many times, which is enough to produce a better self-cleaning effect. Therefore, when the on-off valve is opened, the throttle device is closed to the minimum opening and When it lasts for 5 minutes, you can exit the mild self-cleaning mode.
  • the step of exiting the mild self-cleaning mode further includes: controlling the air conditioner to return to the operating mode before entering the mild self-cleaning mode, controlling the compressor to return to the frequency before entering the mild self-cleaning mode, controlling the indoor fan to turn on and The air deflector of the indoor unit supplies air upwards, controls the throttling device to open to the maximum opening, and controls the on-off valve to close.
  • the air conditioner needs to return to the operating mode before entering the light self-cleaning mode, so as to continue to adjust the indoor temperature.
  • the following takes the heating mode of the air conditioner before entering the mild self-cleaning mode as an example. After the light self-cleaning mode is executed, it needs to switch back to the heating mode.
  • control the four-way valve to restore the heating mode control the frequency of the compressor to return from the maximum limit value to the frequency before entering the mild self-cleaning mode, control the indoor fan to turn on and the air deflector of the indoor unit to send air upward, and control the electronic
  • the expansion valve is opened to the maximum opening, and the on-off valve is controlled to be closed, so that the refrigerant flows in the normal heating mode.
  • the indoor fan is turned on and the air deflector of the indoor unit blows air upwards, so as to prevent the user from having a bad user experience due to the low temperature of the indoor heat exchanger coil when the air conditioner just switches to the heating mode.
  • the throttling device is opened to the maximum opening, because the refrigerant circulates between the compressor and the outdoor heat exchanger when the mild self-cleaning mode is running, resulting in the lack of refrigerant in the indoor heat exchanger, so the throttling device is opened to the maximum opening , so that the refrigerant quickly fills the indoor heat exchanger, so as to realize the normal circulation of the refrigerant as soon as possible.
  • the fan in the control room and the wind deflector return to the operating state before entering the mild self-cleaning mode.
  • the first duration can be any value from 20s to 1min. In this application, it is preferably 30s.
  • the indoor fan is turned on and the wind deflector is blowing air upwards for 30s, the temperature of the coil of the indoor heat exchanger has risen to the same level as that of heating. At this time, control the indoor fan and the wind deflector to return to the operating mode before entering the mild self-cleaning mode to meet the heating demand of the user.
  • the throttling device is controlled to open to the maximum opening for a second duration
  • the throttling device is controlled to return to the opening before entering the mild self-cleaning mode.
  • the second duration can be any value within 1min-5min, and it is preferably 3min in this application.
  • the way to exit the mild self-cleaning mode is not limited to the above one, and those skilled in the art can freely choose a specific control mode on the premise that the air conditioner can be restored to the operating state before entering the mild self-cleaning mode.
  • This choice does not depart from the principles of the present application.
  • the outdoor fan can be controlled to return to the operating state before it entered the mild self-cleaning mode;
  • the indoor fan can be controlled to be turned off first, and then the coil temperature of the indoor heat exchanger can be obtained to rise to a temperature suitable for the heating mode. After the temperature is reached, the indoor fan is controlled to start running.
  • the moderate self-cleaning mode includes: controlling the air conditioner to run in the heating mode; adjusting the operating parameters of the air conditioner so that the coil temperature of the outdoor heat exchanger is less than or equal to the second preset temperature; After the tube temperature is less than or equal to the second preset temperature and lasts for a third preset time, control the air conditioner to switch to cooling mode; control the on-off valve to open, and last for a fourth preset time.
  • the operating parameters include the operating frequency of the compressor, the opening degree of the throttling device, the rotating speed of the indoor fan and the rotating speed of the outdoor fan. specifically,
  • the air conditioner is controlled to operate in a heating mode. Similar to the above mild self-cleaning mode, switching between operating modes of the air conditioner can be controlled by controlling the four-way valve on and off. In this embodiment, after entering the moderate self-cleaning mode, if the air conditioner is running in the heating mode, no adjustment is required, and the air conditioner is controlled to continue running; if the air conditioner is in the non-heating mode, the air conditioner is controlled to switch to the heating mode Hot mode operation.
  • the second self-cleaning frequency is a frequency determined through experiments in advance, and its determination method can refer to the above-mentioned Table 1, which will not be repeated here.
  • the compressor operates at the second self-cleaning frequency, it facilitates the implementation of the subsequent control process.
  • the outdoor fan is first controlled to run at the lowest speed to reduce the heat exchange effect between the outdoor heat exchanger and the air, thereby speeding up the cooling of the outdoor disk.
  • the temperature reduction speed of the tube improves the self-cleaning efficiency in the tube.
  • the second preset speed can be the highest speed of the indoor fan.
  • the indoor fan can be controlled to run at the highest speed, which can improve The heat exchange effect between the refrigerant in the indoor heat exchanger and the environment, thereby reducing the temperature and pressure of the refrigerant, improving the evaporation effect of the refrigerant in the outdoor heat exchanger, and reducing the outdoor coil to the second preset temperature at a faster speed .
  • the opening degree of the throttling device is adjusted so that the coil temperature of the outdoor heat exchanger is less than or equal to the second preset temperature.
  • the second preset temperature is lower than the first preset temperature and higher than the solidification temperature of the refrigerating machine oil. In this way, the speed of solidification and precipitation of oil stains can be faster than that in the mild self-cleaning mode.
  • the second preset temperature may be -10°C.
  • the coil temperature of the outdoor heat exchanger is less than or equal to the second preset temperature as the control purpose, and by adjusting the opening degree of the electronic expansion valve (such as PID adjustment, etc.), the coil temperature of the outdoor heat exchanger is always at The state of being less than or equal to the second preset temperature.
  • the coil temperature of the outdoor heat exchanger can also be made to be less than or equal to the second preset temperature by adjusting the opening degree of the electronic expansion valve to a fixed opening degree.
  • the air conditioner is controlled to switch to the cooling mode.
  • the third preset duration may be any value in 5-15 minutes.
  • the third preset time length in this embodiment is 10 minutes.
  • the operation of the control room fan is stopped. Specifically, when the cooling mode is running, the outlet air temperature of the indoor unit gradually decreases, which will bring bad user experience to the user. At this time, the fan in the control room stops running after running for 30 seconds, which can prevent the temperature of the outlet air from being too low and affect the user experience.
  • 30s such as adjusting to any value in 10s-1min.
  • the on-off valve is controlled to be opened, and the throttling device is closed to a minimum opening degree, and lasts for a fourth preset time period.
  • Control the throttling device to close to the minimum opening degree that is, the state where the opening degree is 0, the throttling device realizes complete throttling, and the refrigerant cannot flow through.
  • the second preset duration can be any value in 3min-10min, preferably 5min in this application.
  • the high-temperature and high-pressure refrigerant discharged from the compressor flows through the outdoor heat exchanger, and the high-temperature and high-pressure refrigerant quickly impacts the coil of the outdoor heat exchanger, and the oil that is temporarily stored inside the coil is melted.
  • the high-temperature refrigerant directly flows back to the liquid receiver through the recovery pipeline to realize recovery and filtration, so as to achieve the purpose of self-cleaning in the tube of the outdoor heat exchanger.
  • the moderate self-cleaning mode further includes: after the step of controlling the air conditioner to switch to cooling mode, controlling the compressor to adjust to the highest limit frequency corresponding to the outdoor ambient temperature.
  • the operating frequency of the compressor is affected by the outdoor ambient temperature and cannot be increased indefinitely, otherwise the phenomenon of high temperature protection shutdown of the compressor will easily occur, which will have a negative impact on the life of the compressor. Therefore, the compressors are all equipped with a protection mechanism. Under different outdoor ambient temperatures, the corresponding maximum frequency limit is set.
  • the rating of the compressor is adjusted to the current outdoor ambient temperature. Under this frequency limit, the compressor can increase the temperature and pressure of the refrigerant in the shortest time, thereby improving the self-cleaning effect.
  • the manner of obtaining the outdoor ambient temperature is a conventional means in the field, and will not be repeated here.
  • the method further includes: when entering the moderate self-cleaning mode, turning off the outdoor antifreeze protection function and the outdoor ambient temperature frequency limiting function, but turning on other protection functions of the air conditioner as usual.
  • the purpose and implementation of this step are the same as those in the light cleaning mode, so details will not be repeated here.
  • the specific control process of the moderate self-cleaning mode is not unique, and those skilled in the art can adjust the control method.
  • the coil temperature of the outdoor heat exchanger can be kept less than or equal to the second preset temperature, the operation frequency of the compressor, the opening degree of the electronic expansion valve, the speed of the indoor fan and the One or more of the rotational speeds of the outdoor fans are omitted.
  • the method further includes: exiting the moderate self-cleaning mode after the on-off valve is opened and the throttling device is closed to the minimum opening for a fourth preset period of time, and the air conditioner is controlled to return to the state of entering operating status prior to self-cleaning mode.
  • the throttling device and the on-off valve are opened for 5 minutes, the high-temperature and high-pressure refrigerant has circulated many times, which is enough to produce a better self-cleaning effect. After 5 minutes, you can exit the moderate self-cleaning mode.
  • the purpose of exiting the moderate self-cleaning mode can be achieved by using the same control method as that for exiting the mild self-cleaning mode described above, which will not be repeated here.
  • the way of exiting the moderate self-cleaning mode is not limited to the same method as exiting the mild self-cleaning mode.
  • the air conditioner can be restored to the operating state before entering the moderate self-cleaning mode
  • the technology in the art Personnel can freely choose a specific control mode, and this choice does not deviate from the principle of the present application.
  • the outdoor fan can be controlled to return to the operating state before entering the moderate self-cleaning mode;
  • the indoor fan can be controlled to be turned off first, and then the temperature of the coil of the indoor heat exchanger rises to a temperature suitable for the heating mode. After the temperature is reached, the indoor fan is controlled to start running.
  • various components of the air conditioner can be controlled to directly restore to the operating parameters before entering the moderate self-cleaning mode.
  • the deep self-cleaning mode includes: repeating the following steps twice: controlling the air conditioner to run in the heating mode; adjusting the operating parameters of the air conditioner so that the coil temperature of the outdoor heat exchanger is less than or equal to the third Preset temperature; when the coil temperature is less than or equal to the third preset temperature and lasts for the fifth preset time, control the air conditioner to switch to cooling mode; control the on-off valve to open, and last for the sixth preset time.
  • the operating parameters include the operating frequency of the compressor, the opening degree of the throttling device, the rotating speed of the indoor fan and the rotating speed of the outdoor fan. specifically,
  • the air conditioner is controlled to operate in a heating mode. Then, control the compressor to adjust to the third self-cleaning frequency. Next, control the outdoor fan to run at the lowest speed, and control the indoor fan to run at the third preset speed.
  • the opening degree of the throttling device is adjusted so that the coil temperature of the outdoor heat exchanger is less than or equal to the third preset temperature. Immediately afterwards, when the coil temperature is less than or equal to the third preset temperature for a fifth preset time period, the air conditioner is controlled to switch to the cooling mode. Next, after the control air conditioner is switched to the cooling mode, the operation of the control room fan is stopped. Finally, the on-off valve is controlled to open, and the throttling device is closed to the minimum opening degree, and lasts for a sixth preset time period.
  • the above-mentioned operating parameters of the deep self-cleaning in the present application can be the same as the moderate self-cleaning, that is, the third self-cleaning frequency, the third preset rotation speed, the third preset temperature, the fifth preset duration and the first
  • the parameters such as the six preset durations are the same as the moderate self-cleaning.
  • deep self-cleaning refers to running the moderate self-cleaning mode twice in a row. The specific control process of the moderate self-cleaning mode will not be repeated here.
  • the deep self-cleaning mode of the present application also includes: after controlling the opening of the on-off valve for the first time and continuing for the sixth preset duration, first controlling the air conditioner to run in the heating mode for the seventh preset duration .
  • first controlling the air conditioner since the air conditioner runs in the heating mode before entering the deep self-cleaning mode, and the indoor fan is in a stopped state during the execution of the deep self-cleaning mode, and the execution time of the deep self-cleaning mode is relatively long, the entire execution process will cause The indoor temperature fluctuates greatly, giving users a bad experience.
  • the application first controls the air conditioner to run in the heating mode for a period of time, and adjusts the indoor Ambient temperature, to avoid large fluctuations in the indoor ambient temperature.
  • the seventh preset duration can be any value in 20-40 minutes, and in this application it can be 30 minutes.
  • the operation of the heating mode can directly resume the operation of the parameters before entering the deep self-cleaning mode, or it can also be operated with additional operation parameters, which can be flexibly selected by those skilled in the art.
  • control parameters of deep self-cleaning are the same as those of moderate self-cleaning.
  • those skilled in the art can also adjust the control parameters of deep self-cleaning to achieve better Good deep self-cleaning effect.
  • the deep self-cleaning mode can only run for one cycle, and the third preset temperature can be further lowered than the second preset temperature, and the fifth or sixth preset duration can be compared with the third or fourth preset temperature. Set the duration to increase, etc.
  • the deep self-cleaning mode further includes: after the step of controlling the air conditioner to switch to cooling mode, controlling the compressor to adjust to the highest limit frequency corresponding to the outdoor ambient temperature.
  • the method further includes: when entering the deep self-cleaning mode, turning off the outdoor antifreeze protection function and the outdoor ambient temperature frequency limiting function, but turning on other protection functions of the air conditioner as usual.
  • the purpose and implementation of this step are the same as those in the light cleaning mode, so details will not be repeated here.
  • the specific control process of the deep self-cleaning mode is not unique, and those skilled in the art can adjust the control method.
  • the coil temperature of the outdoor heat exchanger can be kept at or below the third preset temperature, the operation frequency of the compressor, the opening degree of the electronic expansion valve, the speed of the indoor fan and the One or more of the rotational speeds of the outdoor fans are omitted.
  • the method further includes: exiting the deep self-cleaning mode and controlling the air conditioner to return to Operating state prior to entering deep self-cleaning mode.
  • the air conditioner is continuously operated twice with moderate self-cleaning parameters, and after a period of heating mode between the two times, it is enough to produce a better self-cleaning effect, so the second throttling device and on-off valve Deep self-cleaning mode can be exited when the sixth preset duration is turned on.
  • the purpose of exiting the deep self-cleaning mode can be realized by using the same control method as exiting the light self-cleaning mode described above, which will not be repeated here.
  • the method of exiting the deep self-cleaning mode is not limited to the same method as exiting the mild self-cleaning mode.
  • the air conditioner can be restored to the operating state before entering the deep self-cleaning mode, those skilled in the art can The specific control mode is free to choose, and this choice does not deviate from the principle of the present application.
  • the outdoor fan can be controlled to return to the operating state before entering the deep self-cleaning mode;
  • the indoor fan can be controlled to be turned off first, and then the coil temperature of the indoor heat exchanger can be obtained to rise to a temperature suitable for the heating mode After that, control the indoor fan to start running.
  • the three in-pipe self-cleaning modes of this application control the air conditioner to run in the heating mode first, and adjust the operating parameters of the air conditioner so that the oil in the coil of the outdoor heat exchanger is solidified and stripped from the refrigerant cycle. Attached to the inner wall of the coil of the outdoor heat exchanger, then control the air conditioner to switch to cooling mode, open the on-off valve, close the throttling device, and use the rapid flow of high-temperature and high-pressure refrigerant to impact the inside of the coil of the outdoor heat exchanger. The oil stain stored inside the coil is melted by high temperature and returns directly to the inside of the liquid receiver through the recovery pipeline together with the refrigerant, so as to realize the self-cleaning of the outdoor heat exchanger tube.
  • the cleaning effect of the three in-tube self-cleaning modes from mild, moderate to deep self-cleaning mode is enhanced sequentially, which can match the cleaning effect with the effect of dirty clogging, and realize the intelligent self-cleaning of the outdoor heat exchanger.
  • the application can use the recovery pipeline to realize the recovery of oil pollution during the self-cleaning process of the outdoor heat exchanger, and realize the high-temperature and high-pressure refrigerant to flush the outdoor heat exchanger. Afterwards, without going through the outdoor heat exchanger again, the oil is directly brought back to the liquid receiver for recovery and filtration, which reduces the flow stroke of high-temperature refrigerant, reduces the pressure drop along the way, and improves the self-cleaning effect in the pipe.
  • FIG. 4 is a logic diagram of a possible implementation process of the method for controlling self-cleaning in tubes of an outdoor heat exchanger of the present application.
  • the air conditioner is turned on for heating and running, and then performs the following operations:
  • step S201 is executed to obtain the accumulated running time t of the air conditioner.
  • step S203 is executed to determine whether the accumulated time t ⁇ 20h is established, and if established, step S205 is executed; otherwise, when not established, the operation ends.
  • step S207 is executed to determine whether
  • the above air conditioner also includes some other known structures, such as a processor, a controller, a memory, etc.
  • the memory includes but not limited to random access memory, flash memory, read-only memory, programmable read-only memory, Volatile memory, non-volatile memory, serial memory, parallel memory or registers, etc.
  • processors include but not limited to CPLD/FPGA, DSP, ARM processors, MIPS processors, etc.

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Abstract

La présente invention concerne le domaine technique des fonctions d'auto-nettoyage de climatiseurs et concerne plus particulièrement un procédé de commande pour mettre en œuvre une fonction d'auto-nettoyage dans un tuyau spiralé d'un échangeur de chaleur extérieur. La présente invention vise à résoudre le problème de la manière de réaliser différents degrés de fonctions d'auto-nettoyage dans un tuyau spiralé d'un échangeur de chaleur extérieur. Pour cet objectif, un climatiseur de la présente demande comprend une conduite de récupération, une extrémité de la conduite de récupération étant en communication avec une entrée d'un échangeur de chaleur extérieur et son autre extrémité étant en communication avec un orifice d'aspiration de gaz d'un compresseur ; et une vanne tout ou rien est disposée sur la conduite de récupération. Le procédé de commande consiste à : acquérir des données de fonctionnement d'un climatiseur ; sur la base des données de fonctionnement, déterminer un degré de blocage par des saletés d'un échangeur de chaleur extérieur ; et sur la base du degré de blocage par des saletés, exécuter un mode d'auto-nettoyage dans le tuyau spiralé correspondant, le degré de blocage par des saletés comprenant un blocage faible par des saletés, un blocage modéré par des saletés et un blocage important par des saletés et le mode d'auto-nettoyage dans le tuyau spiralé comprend un mode d'auto-nettoyage doux, un mode d'auto-nettoyage modéré et un mode d'auto-nettoyage profond. Dans la présente demande, par l'intermédiaire de l'exécution, sur la base du degré de blocage par des saletés d'un échangeur de chaleur intérieur, d'un mode d'auto-nettoyage dans le tuyau spiralé d'un degré correspondant, une fonction d'auto-nettoyage dans le tuyau spiralé plus intelligente peut être réalisée.
PCT/CN2021/129815 2021-07-09 2021-11-10 Procédé de commande pour mettre en œuvre une fonction d'auto-nettoyage dans un tuyau spiralé d'échangeur de chaleur extérieur WO2023279613A1 (fr)

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