WO2023279614A1 - Procédé de commande d'auto-nettoyage en tube d'échangeur de chaleur intérieur - Google Patents

Procédé de commande d'auto-nettoyage en tube d'échangeur de chaleur intérieur Download PDF

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Publication number
WO2023279614A1
WO2023279614A1 PCT/CN2021/129817 CN2021129817W WO2023279614A1 WO 2023279614 A1 WO2023279614 A1 WO 2023279614A1 CN 2021129817 W CN2021129817 W CN 2021129817W WO 2023279614 A1 WO2023279614 A1 WO 2023279614A1
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Prior art keywords
self
air conditioner
heat exchanger
indoor heat
cleaning
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PCT/CN2021/129817
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English (en)
Chinese (zh)
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罗荣邦
崔俊
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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 WO2023279614A1 publication Critical patent/WO2023279614A1/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
    • F24F11/62—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
    • F24F11/50—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
    • F24F11/67—Switching between heating and cooling modes
    • 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
    • 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
    • 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 indoor heat exchangers.
  • Some of the current air conditioners have the self-cleaning function of the inner and outer units. Take the self-cleaning process of the indoor heat exchanger as an example. When the self-cleaning function is executed, the frosting and defrosting operations of the indoor heat exchanger are realized by switching between cooling and heating modes, so that the indoor heat exchanger will be turned off when the frost layer melts. Surface dirt is rinsed away.
  • the current self-cleaning function is limited to cleaning the outer surface of the indoor heat exchanger, and cannot clean the inside of the coil.
  • the inside of the coil of the indoor heat exchanger will accumulate impurities, freezing Therefore, it is especially necessary to self-clean the inside of the coil of the indoor heat exchanger.
  • the cleaning method is fixed, and the degree of self-cleaning cannot be intelligently controlled according to the dirtiness of the indoor heat exchanger.
  • the self-cleaning time is long when it is light, which affects the user's normal experience, and the self-cleaning is not thorough when the outer surface of the indoor heat exchanger is seriously dirty.
  • the application provides a self-cleaning control method in the tube of the indoor 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 outlet 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 operate in cooling mode; adjusting the operating parameters of the air conditioner so that the coil temperature of the indoor heat exchanger is less than or equal to the first preset temperature; when the 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 heating 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 cooling mode; adjusting the operating parameters of the air conditioner so that the coil temperature of the indoor heat exchanger is less than or equal to the second preset temperature; when the 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 heating 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 operate in cooling mode; adjusting the operating parameters of the air conditioner so that the coil temperature of the indoor heat exchanger is less than or equal to the third preset temperature; Set the temperature; when the coil temperature is less than or equal to the third preset temperature and last for the fifth preset time, control the air conditioner to switch to the heating mode; control the on-off valve to open, and last for the 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 greater than the freezing temperature of the refrigerating machine oil.
  • the mild self-cleaning mode further includes: in the mild self-cleaning mode,
  • control the compressor After controlling the air conditioner to switch to the heating mode, control the compressor to adjust to the highest limit frequency corresponding to the outdoor ambient temperature;
  • the step of adjusting the operating parameters of the air conditioner includes: controlling the compressor to adjust to the first self-cleaning frequency, controlling the outdoor fan to maintain the current running state, and controlling the indoor fan to run at a preset speed; and/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 throttling device is controlled to open to a maximum opening degree
  • control method 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.
  • the moderate self-cleaning mode further includes: in the moderate self-cleaning mode,
  • control the compressor After controlling the air conditioner to switch to the heating mode, control the compressor to adjust to the highest limit frequency corresponding to the outdoor ambient temperature;
  • the step of adjusting the operating parameters of the air conditioner includes: controlling the compressor to adjust to the second self-cleaning frequency, controlling the outdoor fan to run at the highest speed, controlling the indoor fan to stop running; and/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 throttling device is controlled to open to a maximum opening degree
  • control method further includes:
  • the deep self-cleaning mode further includes: in the deep self-cleaning mode,
  • control the compressor After controlling the air conditioner to switch to the heating mode, control the compressor to adjust to the highest limit frequency corresponding to the outdoor ambient temperature;
  • the step of adjusting the operating parameters of the air conditioner includes: controlling the compressor to adjust to the third self-cleaning frequency, controlling the outdoor fan to run at the highest speed, controlling the indoor fan to stop running; and/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 throttling device is controlled to open to a maximum opening degree
  • 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 operation data includes the cumulative running time of the air conditioner and the coil temperature of the indoor heat exchanger, "acquire the temperature of the air conditioner
  • the step of running data further includes:
  • the step of "judging the degree of dirty blockage of the indoor heat exchanger based on the operation 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 dirty blockage of the indoor heat exchanger based on the operation data" further includes:
  • the ratio is greater than the third threshold and less than or equal to the fourth threshold, it is judged that the indoor heat exchanger is the mildly dirty blockage
  • the target opening degree is determined based on the target exhaust temperature and the outdoor environment 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 dirty blockage of the indoor heat exchanger based on the operating data" further includes:
  • the control method of the application can not only realize the self-cleaning of the indoor heat exchanger in the tube, but also It can implement a matching in-tube self-cleaning mode based on the degree of dirty blockage of the indoor heat exchanger to achieve a more intelligent in-tube self-cleaning.
  • Fig. 1 is the system diagram of the air conditioner of the present application in cooling mode
  • Fig. 2 is the system diagram of the air conditioner of the present application in heating mode
  • Fig. 3 is the flowchart of the self-cleaning control method in the tube of the indoor 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 indoor heat exchangers 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 compressor 1 communicates with the P interface of four-way valve 2 through refrigerant pipeline 6, and the C interface of four-way valve 2 communicates with the inlet of outdoor heat exchanger 3 through 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 indoor heat exchanger 5 through the refrigerant pipeline 6, and the outlet of the indoor heat exchanger 5 passes through the refrigerant pipeline 6 is connected with the E 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.
  • the method for controlling the self-cleaning in the tube of the indoor 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 heating mode
  • FIG. 3 is a flow chart of the control method of the indoor heat exchanger for self-cleaning in the tube of the present application.
  • the self-cleaning control method in the tube of the indoor heat exchanger of the present application includes:
  • the operating data of the air conditioner includes the accumulated operating time, the coil temperature of the indoor heat exchanger, the actual opening degree of the throttling device (when the throttling device is an electronic expansion valve), and 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 indoor 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 clogging of the indoor heat exchanger is mild dirty clogging, the air conditioner is controlled to perform a mild self-cleaning mode; when it is judged that the dirty clogging degree of the indoor heat exchanger is moderate dirty clogging, The air conditioner is controlled to execute the moderate self-cleaning mode; when it is judged that the degree of dirty clogging of the indoor 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 indoor heat exchanger in the tube Cleaning, and can also implement a corresponding degree of in-tube self-cleaning mode based on the degree of dirt and blockage of the indoor heat exchanger, so that the self-cleaning effect can adapt to the degree of dirt and blockage, and realize more intelligent self-cleaning in the tube.
  • the throttling device can 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 indoor 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 accumulative running time of the air conditioner reaches 20 hours, it indicates that the indoor heat exchanger may be dirty and clogged, and the degree of dirty clogging needs to be judged.
  • the coil temperature of the indoor heat exchanger during 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 dirty blockage of the indoor 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 indoor heat exchanger is considered to be mildly dirty; if 2 ⁇
  • the process of judging the degree of dirty blockage of the indoor heat exchanger is similar to that in the cooling 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 indoor 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 indoor 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 indoor heat exchanger is moderately dirty; when the ratio is greater than the fifth threshold, it is judged that the indoor 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 indoor 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 of the electronic expansion valve must be greater than its target opening . Therefore, the comparison between the actual opening degree of the electronic expansion valve and its target opening degree can be used to determine whether the indoor heat exchanger is dirty and to what extent.
  • 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 indoor heat exchanger is not very dirty and does not need self-cleaning; if 1 ⁇ B/Bset ⁇ 1.1, it is considered that the indoor heat exchanger is slightly dirty; if 1.1 ⁇ If ⁇ B/Bset ⁇ 1.2, the indoor heat exchanger is considered to be moderately dirty; if ⁇ B/Bset>1.2, the indoor 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 indoor 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 serious the indoor heat exchanger is blocked, the worse the heat exchange effect will be, and the higher the suction temperature and discharge temperature of the compressor will be. Therefore, it is possible to determine whether the indoor heat exchanger is dirty and to what extent 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 indoor heat exchanger is not very dirty and does not need self-cleaning; if 1 ⁇ T/Td ⁇ 1.1, it is considered that the indoor heat exchanger is slightly dirty; if 1.1 ⁇ If ⁇ T/Td ⁇ 1.2, the indoor heat exchanger is considered to be moderately dirty; if ⁇ T/Td>1.2, the indoor 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 cooling mode; adjusting the operating parameters of the air conditioner so that the coil temperature of the indoor heat exchanger is less than or equal to the first preset temperature; when the coil After the temperature is less than or equal to the first preset temperature and lasts for the first preset time period, the air conditioner is controlled to switch to the heating mode; the on-off valve is controlled to open and lasts for the second preset time period.
  • 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 cooling 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 off, the air conditioner operates in cooling mode; heat mode.
  • the air conditioner after entering the mild self-cleaning mode, if the air conditioner is running in the cooling mode, no adjustment is required, and the air conditioner is controlled to continue running; if the air conditioner is running in a non-cooling mode, the air conditioner is controlled to switch to the cooling mode. .
  • 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.
  • control the outdoor fan to maintain the current running state, and control the indoor fan to run at a preset speed Specifically, in the mild self-cleaning mode, since the dirty blockage of the indoor heat exchanger is not serious, before adjusting the opening of the throttling device, it is only necessary to control the outdoor fan to maintain the current operating state and keep the refrigerant in the indoor heat exchanger.
  • the evaporative effect in the system can reduce the temperature of the indoor coil to the first preset temperature.
  • the preset speed can be a medium speed in the speed of the indoor fan, such as 500r/min-800r/min, and this application can be 700r/min, because the air conditioner is running before entering the mild self-cleaning mode.
  • the indoor ambient temperature is adjusted. Therefore, on the basis of ensuring the self-cleaning effect, by controlling the outdoor fan to maintain the current operating state, and the indoor fan runs at a certain preset speed, a certain degree of indoor comfort can be guaranteed.
  • the opening degree of the throttling device is adjusted so that the coil temperature of the indoor heat exchanger is less than or equal to the first preset temperature.
  • the temperature sensor can detect the coil temperature of the indoor heat exchanger, and dynamically adjust the opening of the electronic expansion valve, so that the coil temperature of the indoor 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 indoor 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 indoor heat exchanger is always at The state of being less than or equal to the first preset temperature.
  • the coil temperature of the indoor heat exchanger may also be lower 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 heating 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 on-off valve is controlled to be opened, and the throttling device is opened to a first preset opening degree for a second preset duration.
  • the first preset opening degree is the maximum opening degree of the throttling device.
  • 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 indoor heat exchanger, and the high-temperature and high-pressure refrigerant quickly impacts the coil of the indoor heat exchanger, and the oil that is temporarily stored in 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 indoor heat exchanger. Controlling the throttling device to open to the maximum opening can allow the high-temperature and high-pressure refrigerant to pass quickly, reduce the pressure drop during the refrigerant flow process, and improve the self-cleaning effect in the pipe.
  • the mild self-cleaning mode further includes: after the step of controlling the air conditioner to switch to the heating 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. In this application, after the air conditioner is switched to heating mode, the rating of the compressor is adjusted to the current outdoor environment.
  • the highest limit frequency under the 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 indoor antifreeze protection function and the outdoor ambient temperature frequency limiting function. Since the coil temperature of the indoor 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, so during the cooling operation, turn off the indoor anti-freeze protection function and the outdoor ambient temperature frequency limit function to ensure the smooth execution of this method.
  • other protection functions of the air conditioner are turned on as usual, such as compressor exhaust protection and current overload protection, etc., 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 indoor 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 rotation speed of the outdoor fan may be determined according to the outdoor ambient temperature, and then the operation of the outdoor fan may be controlled.
  • the method further includes: exiting the mild self-cleaning mode after the on-off valve is opened and the throttling device is opened to the first preset opening degree for a second preset period of time, and the air conditioner is controlled to recover to the state of operation before entering the mild 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. Therefore, when the throttling device and the on-off valve are opened for 5 minutes, 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 maintain 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 air conditioner running in the cooling mode 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 cooling mode.
  • control the four-way valve to power off to restore the cooling mode control the frequency of the compressor to return from the highest 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 maintains the maximum opening and controls the on-off valve to close, so that the refrigerant flows in the normal cooling mode.
  • the air deflector of the indoor unit blows air upwards, so as to prevent the bad user experience caused by the high temperature of the indoor heat exchanger coil due to the high temperature of the indoor heat exchanger coil when the air conditioner just switches to cooling mode.
  • the throttling device maintains the maximum opening degree, because the refrigerant circulates between the compressor and the indoor heat exchanger when the mild self-cleaning mode is running, resulting in the lack of refrigerant in the outdoor heat exchanger, so the throttling device maintains the maximum opening degree, making The refrigerant quickly fills the outdoor heat exchanger to realize the normal circulation of the refrigerant as soon as possible.
  • the control indoor fan and the air 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 air deflector is blowing air upwards for 30s, the temperature of the coil of the indoor heat exchanger has dropped to the same level as the cooling mode. At this time, the indoor fan and the air deflector are controlled to return to the operating mode before entering the mild self-cleaning mode to meet the cooling needs of the user.
  • the throttling device is controlled to maintain the maximum opening for the 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 entering the mild self-cleaning mode;
  • the indoor fan can be controlled after the coil temperature of the indoor heat exchanger has dropped to a temperature suitable for the cooling mode Start running.
  • the moderate self-cleaning mode includes: controlling the air conditioner to operate in cooling mode; adjusting the operating parameters of the air conditioner so that the coil temperature of the indoor heat exchanger is less than or equal to the second preset temperature; when the coil After the temperature is less than or equal to the second preset temperature and lasts for a third preset time period, the air conditioner is controlled to switch to a heating mode; the on-off valve is controlled to open for a fourth preset time period.
  • 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 cooling 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 cooling mode, no adjustment is required, and the air conditioner is controlled to continue running; if the air conditioner is running in a non-cooling mode, the air conditioner is controlled to switch to the cooling mode. .
  • 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.
  • control the outdoor fan to run at the highest speed and control the indoor fan to stop running.
  • the indoor heat exchanger is more dirty and clogged, before adjusting the opening of the throttling device, by controlling the outdoor fan to run at the highest speed, it is possible to improve the flow rate between the refrigerant and the outdoor heat exchanger.
  • the heat exchange effect between environments reduces the temperature and pressure of the refrigerant, improves the evaporation effect of the refrigerant in the indoor heat exchanger, and makes the indoor coil reduce to the second preset temperature at a faster speed.
  • Controlling the stop of the indoor fan can reduce the heat exchange effect between the indoor heat exchanger and the air, thereby speeding up the temperature reduction of the indoor coil and improving the self-cleaning efficiency and effect in the tube.
  • the opening degree of the throttling device is adjusted so that the coil temperature of the indoor 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. That is to say, the coil temperature of the indoor heat exchanger is set to be less than or equal to the second preset temperature as the control purpose, and the coil temperature of the indoor heat exchanger is always at The state of being less than or equal to the second preset temperature.
  • the coil temperature of the indoor 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 heating 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 on-off valve is controlled to be opened, and the throttling device is opened to a second preset opening degree for a fourth preset duration.
  • the second preset opening degree is the maximum opening degree of the throttling device.
  • the fourth preset time length 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 indoor heat exchanger, and the high-temperature and high-pressure refrigerant quickly impacts the coil of the indoor heat exchanger, and the oil that is temporarily stored in 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 indoor heat exchanger. Controlling the throttling device to open to the maximum opening can allow the high-temperature and high-pressure refrigerant to pass quickly, reduce the pressure drop during the refrigerant flow process, and improve the self-cleaning effect in the pipe.
  • the moderate self-cleaning mode further includes: after the step of controlling the air conditioner to switch to the heating 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. In this application, after the air conditioner is switched to heating mode, the rating of the compressor is adjusted to the current outdoor environment.
  • the highest limit frequency under the 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 indoor 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 temperature of the coil tube of the indoor 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 rotation speed of the outdoor fan may be determined according to the outdoor ambient temperature, and then the operation of the outdoor fan may be controlled.
  • the method further includes: exiting the moderate self-cleaning mode after the on-off valve is opened and the throttling device is opened to the second preset opening for a fourth preset period of time, and the air conditioner is controlled to recover to the state of operation before entering the moderate 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. Therefore, when the throttling device and the on-off valve are opened for 5 minutes, 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 after the coil temperature of the indoor heat exchanger has dropped to a temperature suitable for the cooling mode 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 cooling mode; adjusting the operating parameters of the air conditioner so that the coil temperature of the indoor heat exchanger is less than or equal to the third preset Set the temperature; when the coil temperature is less than or equal to the third preset temperature and last for the fifth preset time, control the air conditioner to switch to the heating 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 cooling mode. Then, control the compressor to adjust to the third self-cleaning frequency. Next, control the outdoor fan to run at the highest speed, and control the indoor fan to stop running. Next, the opening degree of the throttling device is adjusted so that the coil temperature of the indoor 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 heating mode. Finally, the on-off valve is controlled to be opened, and the throttling device is opened to a third preset opening degree for a sixth preset duration.
  • 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 temperature, the fifth preset duration, the third preset opening degree and The parameters such as the sixth preset duration 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.
  • 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 the heating 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 indoor 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 temperature of the coil tube of the indoor heat exchanger can be kept less than or equal to 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 rotation speed of the outdoor fan may be determined according to the outdoor ambient temperature, and then the operation of the outdoor fan may be controlled.
  • the method further includes: exiting the deep self-cleaning mode and controlling the air conditioner after the second on-off valve is opened and the throttling device is opened to the third preset opening for a sixth preset period of time.
  • the unit will return to the operating state it was in before entering deep self-cleaning mode.
  • the air conditioner runs twice continuously with moderate self-cleaning parameters, it is enough to produce a better self-cleaning effect, so when the second throttling device and the on-off valve are opened for the sixth preset time, the deep self-cleaning can be exited. cleaning mode.
  • 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 start after the coil temperature of the indoor heat exchanger has dropped to a temperature suitable for the cooling mode. run.
  • the three in-pipe self-cleaning modes of this application control the air conditioner to run in the cooling mode first, and adjust the opening of the throttling device so that the oil in the coil of the indoor heat exchanger is solidified and stripped from the refrigerant circulation, Attached to the inner wall of the coil of the indoor heat exchanger, then control the air conditioner to switch to heating mode, and open the on-off valve and throttling device, and use the rapid flow of high-temperature and high-pressure refrigerant to impact the inside of the coil of the indoor heat exchanger.
  • the oil stain stored inside the coil is melted by high temperature and returns directly to the liquid receiver through the recovery pipeline together with the refrigerant, realizing the self-cleaning of the indoor heat exchanger tube.
  • the cleaning effects of the three in-tube self-cleaning modes are sequentially enhanced from mild, moderate to deep self-cleaning modes, which can match the cleaning effect with the effect of dirty clogging, and realize intelligent self-cleaning of indoor heat exchangers.
  • the application can use the recovery pipeline to realize the recovery of oil stains during the self-cleaning process of the indoor heat exchanger, and realize the flushing of the indoor heat exchanger by the high-temperature and high-pressure refrigerant.
  • 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 control method for self-cleaning in tubes of indoor heat exchangers of the present application.
  • the air conditioner starts to cool and run, 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 de l'auto-nettoyage de climatiseur et, en particulier, un procédé de commande d'auto-nettoyage en tube d'échangeur de chaleur intérieur. La présente demande vise à résoudre le problème du mode d'obtention de différents degrés d'auto-nettoyage en tube d'un échangeur de chaleur intérieur. À cet effet, le climatiseur de la présente demande comprend une conduite de récupération. Une extrémité de la conduite de récupération communique avec la sortie d'un échangeur de chaleur extérieur et l'autre extrémité de la conduite de récupération communique avec l'orifice d'aspiration d'air d'un compresseur. La conduite de récupération comporte un robinet marche-arrêt. Le procédé de commande consiste à : acquérir des données de fonctionnement du climatiseur ; déterminer le degré de blocage par des saletés de l'échangeur de chaleur intérieur d'après les données de fonctionnement ; et d'après le degré de blocage par des saletés, exécuter un mode correspondant d'auto-nettoyage en tube, le degré de blocage par des saleté comprenant un blocage léger par des saletés, un blocage modéré par des saletés et un blocage sévère par des saletés et le mode d'auto-nettoyage en tube comprenant un mode doux d'auto-nettoyage, un mode modéré d'auto-nettoyage et un mode profond d'auto-nettoyage. Selon la présente demande, d'après le degré de blocage par des saletés de l'échangeur de chaleur intérieur, un degré correspondant de mode d'auto-nettoyage en tube peut être exécuté, ce qui permet d'obtenir un auto-nettoyage relativement intelligent en tube.
PCT/CN2021/129817 2021-07-09 2021-11-10 Procédé de commande d'auto-nettoyage en tube d'échangeur de chaleur intérieur WO2023279614A1 (fr)

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CN113944983B (zh) * 2021-11-26 2022-11-25 宁波奥克斯电气股份有限公司 一种空调器的控制方法和空调器

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