WO2023279611A1 - Procédé de commande d'auto-nettoyage hors tuyau pour échangeur de chaleur extérieur - Google Patents

Procédé de commande d'auto-nettoyage hors tuyau pour échangeur de chaleur extérieur Download PDF

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Publication number
WO2023279611A1
WO2023279611A1 PCT/CN2021/129802 CN2021129802W WO2023279611A1 WO 2023279611 A1 WO2023279611 A1 WO 2023279611A1 CN 2021129802 W CN2021129802 W CN 2021129802W WO 2023279611 A1 WO2023279611 A1 WO 2023279611A1
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Prior art keywords
self
heat exchanger
cleaning
outdoor heat
controlling
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PCT/CN2021/129802
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English (en)
Chinese (zh)
Inventor
罗荣邦
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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 WO2023279611A1 publication Critical patent/WO2023279611A1/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
    • 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
    • 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 outside the tube of an outdoor heat exchanger.
  • Some of the current air conditioners have the self-cleaning function of the inner and outer units. Take the self-cleaning process of the outdoor heat exchanger as an example. When the self-cleaning function is executed, the frosting and defrosting operations of the outdoor coil are realized by switching between cooling and heating modes, so that when the frost layer melts, the outdoor coil will be adhered to Rinse away the dirt.
  • 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 an external heat exchanger for outdoor heat exchangers.
  • the self-cleaning control method is applied to an air conditioner, and the air conditioner includes a compressor connected through a refrigerant pipeline, a four-way valve, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger, and the outdoor heat exchanger is configured with
  • the outdoor fan the air conditioner also includes a 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 arranged on the recovery pipeline, and the on-off valve is a normally closed valve.
  • control methods include:
  • the degree of dust adhesion includes light adhesion, moderate adhesion and heavy adhesion, and the self-cleaning mode outside 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 heating mode; controlling the compressor to adjust to the first self-cleaning frequency; adjusting the opening of the throttling device so that the outdoor heat exchanger The coil temperature is less than or equal to the first preset temperature to realize frosting; 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; Controlling the opening of the on-off valve and closing the throttling device to a minimum opening for a second preset period of time to achieve defrosting;
  • the moderate self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; controlling the compressor to adjust to the second self-cleaning frequency; adjusting the opening of the throttling device so that the outdoor heat exchanger The coil temperature is less than or equal to the second preset temperature to realize frosting; when 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; Controlling the opening of the on-off valve and closing the throttling device to a minimum opening for a fourth preset period of time to achieve defrosting;
  • the deep self-cleaning mode includes: repeating the following steps twice: controlling the air conditioner to run in heating mode; controlling the compressor to adjust to the third self-cleaning frequency; adjusting the opening of the throttling device so that The coil temperature of the outdoor heat exchanger is less than or equal to a third preset temperature to realize frosting; when the coil temperature is less than or equal to the third preset temperature and lasts for a fifth preset time, the air conditioner is controlled switch to refrigeration mode; control the on-off valve to open, the throttling device to close to the minimum opening, and last for the sixth preset period of time to achieve defrosting.
  • the mild self-cleaning mode further includes: after controlling the air conditioner to switch to cooling mode, controlling the compressor to adjust to the outdoor environment The maximum limit frequency corresponding to the temperature; and/or
  • the mild self-cleaning mode further includes: before adjusting the opening of the throttling device, controlling the outdoor fan to run at the lowest wind speed, and controlling the indoor fan to run at the first preset speed.
  • control method further includes:
  • the mild self-cleaning mode is exited, and the air conditioner is controlled to return to the mild self-cleaning mode. operating status prior to self-cleaning mode.
  • the moderate self-cleaning mode further includes: after controlling the air conditioner to switch to cooling mode, controlling the compressor to adjust to the outdoor environment The maximum limit frequency corresponding to the temperature; and/or
  • the moderate self-cleaning mode further includes: before adjusting the opening degree of the throttling device, controlling the outdoor fan to run at the lowest speed, and controlling the indoor fan to run at the second preset speed.
  • control method further includes:
  • the moderate self-cleaning mode is exited, and the air conditioner is controlled to return to the middle mode. operating status prior to self-cleaning mode.
  • the deep self-cleaning mode further includes: after controlling the air conditioner to switch to cooling mode, controlling the compressor to adjust to the outdoor ambient temperature the corresponding upper limit frequency; and/or
  • the deep self-cleaning mode also includes: before adjusting the opening of the throttling device, controlling the outdoor fan to run at the lowest speed, and controlling the indoor fan to run at the third preset speed;
  • 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 further includes:
  • the deep self-cleaning mode is exited, and the air conditioner is controlled to return to the set state. operating status prior to the deep self-cleaning mode described.
  • control method further includes:
  • the outdoor anti-freezing protection function and the outdoor ambient temperature frequency limiting function are turned off.
  • the outdoor fan is a DC fan
  • the operating parameters include the actual speed and voltage of the outdoor fan
  • the step of "judging the degree of dust adhesion of the outdoor heat exchanger based on the operating parameters" further includes:
  • the outdoor fan is an AC fan
  • the operating parameters include the actual speed and current value of the outdoor fan
  • the step of "judging the degree of dust adhesion of the outdoor heat exchanger based on the operating parameters" further includes:
  • the control method of the present application can not only realize the self-cleaning outside the pipe of the outdoor heat exchanger, Moreover, it is also possible to implement a matching external self-cleaning mode based on the degree of dust adhesion of the outdoor heat exchanger to achieve more intelligent external 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 outside 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 the self-cleaning outside the pipe of the 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 a heating 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 reservoir 9.
  • the heat exchanger 5 is equipped with an indoor fan 10
  • the outdoor heat exchanger 3 is equipped with an outdoor fan 11.
  • the indoor fan 10 can be a cross-flow fan, or an axial flow fan or a centrifugal fan
  • the outdoor fan 11 can be an axial flow fan or a centrifugal fan. fan.
  • 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 is an electronic expansion valve, and the liquid reservoir 9 is provided with a filter net.
  • 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.
  • 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 of the outdoor heat exchanger for self-cleaning outside the tube of the present application.
  • the external self-cleaning control method of the outdoor heat exchanger of the present application includes:
  • the operating parameters of the outdoor fan include actual rotational speed, actual current value, actual voltage value, etc., and one or more of the above operating parameters of the outdoor fan are acquired during the operation of the air conditioner.
  • the acquisition methods of the above-mentioned operating parameters belong to conventional means in the art, and will not be repeated here.
  • the range or size of the operating parameters is determined, and then the dust adhesion degree of the outdoor heat exchanger is determined.
  • the degree of dust adhesion in this application can be divided into light adhesion, moderate adhesion and heavy adhesion.
  • the self-cleaning mode outside the pipe includes mild self-cleaning mode, medium High self-cleaning mode and deep self-cleaning mode.
  • the air conditioner when it is judged that the degree of dust adhesion on the outdoor heat exchanger is mild, the air conditioner is controlled to perform a mild self-cleaning mode; when it is judged that the degree of dust adhesion on the outdoor heat exchanger is moderate, the air conditioner is controlled to The air conditioner performs a moderate self-cleaning mode; when it is judged that the degree of dust adhesion on the outdoor heat exchanger is heavy, the air conditioner is controlled to perform a deep self-cleaning mode.
  • the control method of the present application can not only realize the control of the outdoor heat exchanger.
  • External self-cleaning and can also implement a corresponding degree of external self-cleaning mode based on the dust adhesion degree of the outdoor heat exchanger, so that the self-cleaning effect can adapt to the dust adhesion degree, and realize more intelligent external self-cleaning.
  • the outdoor fan is a DC fan
  • the operating parameters include the actual rotational speed and actual voltage value of the outdoor fan.
  • Obtaining the operating parameters of the outdoor fan means obtaining the actual rotational speed and actual voltage value of the outdoor fan.
  • the way of obtaining the actual voltage value of the outdoor fan belongs to the conventional means in the field, and will not be repeated here.
  • the acquisition of the actual rotational speed of the outdoor fan may be achieved in the following manner:
  • the speed of the indoor fan is set by the user or automatically, while the speed of the outdoor fan is determined by the system according to the operating environment.
  • the rotation speed of the outdoor fan is jointly determined by the frequency of the compressor and the outdoor ambient temperature.
  • the speed of the outdoor fan is determined by the following formula:
  • r is the speed of the outdoor fan
  • f is the operating frequency of the compressor
  • Tao is the outdoor ambient temperature
  • a is the frequency coefficient
  • b is the temperature coefficient
  • c is a constant.
  • a, b, and c can be determined based on the test method.
  • the experimental process is roughly as follows: adjust the speed of the outdoor fan for each compressor operating frequency and outdoor ambient temperature, and obtain the outdoor fan speed when the outdoor heat exchanger is better.
  • the rotational speed is taken as the optimum rotational speed of the outdoor fan at the corresponding operating frequency of the compressor and the outdoor ambient temperature.
  • multiple sets of test data of the optimal rotational speed are obtained, and the specific values of a, b, and c are obtained by fitting the test data.
  • the actual rotational speed of the outdoor fan is determined and adjusted in real time based on the operating frequency of the compressor and the outdoor ambient temperature. Therefore, obtaining the actual speed of the outdoor fan means obtaining the current operating frequency of the compressor and the outdoor ambient temperature, and then calculating the actual speed of the outdoor fan based on formula (1).
  • the acquisition of the actual rotational speed can also directly read the rotational speed of the outdoor fan.
  • the actual rotational speed is acquired through a formula, which is more convenient for the following calculation and judgment process.
  • the step of "judging the degree of dust adhesion of the outdoor heat exchanger based on the operating parameters" further includes:
  • the theoretical voltage value is determined based on experiments. Specifically, for different actual speeds of outdoor fans (determined based on the above formula), the input current value is fixed under the same load (such as no dust on the outdoor heat exchanger), and then the bus voltage value at each speed is recorded as The theoretical voltage value of the outdoor fan at the actual speed.
  • the actual load of the outdoor fan changes.
  • the air conditioner will automatically adjust the input voltage value of the outdoor fan, and the greater the load, the greater the adjusted input voltage value. Therefore, the comparison between the actual voltage value of the outdoor fan and its theoretical voltage value can be used to determine whether there is dust adhesion on the outdoor heat exchanger and the degree of dust adhesion.
  • the first threshold, the second threshold and the third threshold increase sequentially, wherein the first threshold is any value in 0.9-1.05, the second threshold is any value in 1.05-1.2, and the third threshold is 1.3 Any value from -1.6.
  • the first threshold value is 1, the second threshold value is 1.1, and the third threshold value is 1.5.
  • the outdoor fan is an AC fan
  • the operating parameters include the actual rotational speed and actual current value of the outdoor fan.
  • Obtaining the operating parameters of the outdoor fan means obtaining the actual rotational speed and actual current value of the outdoor fan.
  • the manner of obtaining the actual current value of the outdoor fan belongs to conventional means in the field, and will not be repeated here.
  • the actual rotational speed of the outdoor fan may be obtained in the same manner as in Embodiment 1, by using a formula, or directly.
  • the step of "judging the degree of dust adhesion of the outdoor heat exchanger based on the operating parameters" further includes:
  • the theoretical current value is determined based on experiments. Specifically, for the AC fan, its voltage is a constant voltage, and for different actual speeds of the outdoor fan (determined based on the above formula), record each speed under the same load (such as no dust attached to the outdoor heat exchanger) The input current value below is taken as the theoretical current value of the outdoor fan at the actual speed.
  • the actual load of the outdoor fan changes.
  • the air conditioner will automatically adjust the outdoor fan speed. The input current value of the fan, and the greater the load, the greater the adjusted input current value. Therefore, the comparison between the actual current value of the outdoor fan and its theoretical current value can be used to determine whether there is dust adhesion in the outdoor heat exchanger and the degree of dust adhesion.
  • the fourth threshold, the fifth threshold and the sixth threshold increase sequentially, wherein the fourth threshold is any value in 0.9-1.05, the fifth threshold is any value in 1.05-1.2, and the sixth threshold is 1.3 Any value from -1.6.
  • the fourth threshold value is 1, the fifth threshold value is 1.1, and the sixth threshold value is 1.5.
  • the mild self-cleaning mode includes: controlling the air conditioner to run in the heating mode; controlling the compressor to adjust to the first self-cleaning frequency; adjusting the opening of the throttling device so that the outdoor The coil temperature of the heater is less than or equal to the first preset temperature to realize frosting on the outer surface of the coil; when the coil temperature is less than or equal to the first preset temperature and lasts for the first preset time, the air conditioner is controlled to switch to cooling mode ; Control the on-off valve to open, the throttling device to close to the minimum opening, and last for a second preset time to realize the defrosting of the outer surface of the coil.
  • 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 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 first preset temperature, so as to achieve frosting on the outer surface of the coil.
  • 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. Due to the dust attached to the outer surface of the outdoor heat exchanger, after the coil temperature drops to a certain temperature and lasts for a certain period of time, frost will appear on the outer surface of the coil.
  • 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. That is to say, 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 is kept at a state of less than or equal to -5°C, and frost will form on the outer surface of the outdoor heat exchanger at this time.
  • 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 switch between the operation modes of the air conditioner is controlled by controlling the power on and off of the four-way valve, for example, the power off of the four-way valve is controlled, and the air conditioner operates in the cooling mode.
  • the on-off valve is controlled to open, the throttling device is closed to the minimum opening, and lasts for a second preset time to realize defrosting.
  • 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 exchanges heat with the coil of the outdoor heat exchanger, melting the frost layer on the outer surface of the outdoor heat exchanger , the dust attached to the outer surface of the outdoor heat exchanger also flows away with the melted water.
  • the high-temperature refrigerant flows back to the liquid receiver through the recovery pipeline to achieve the purpose of self-cleaning outside 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 mild self-cleaning mode further includes: before adjusting the opening degree of the throttling device, controlling the outdoor fan to run at the lowest speed, and controlling the indoor fan to run at the first preset speed.
  • the outdoor fan before adjusting the opening of the throttling device, the outdoor fan is 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 outside the tube.
  • the first preset speed in this application can be the lowest speed in the speed of the indoor fan, such as 400r/min-700r/min, this application can be 500r/min, because the dust adhesion 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 indoor fan is controlled to stop running. 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 above 30s such as adjusting to any value in 10s-1min.
  • 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. frequency function to ensure the smooth execution of the 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 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 complete the defrosting operation. Therefore, when the on-off valve is opened and the throttling device is closed to the minimum opening for 5 minutes, The mild self-cleaning mode can be exited.
  • 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 maintains the maximum opening and controls the on-off valve to close, 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 when the temperature of the outdoor heat exchanger coil is too low when the air conditioner just switches to the heating mode.
  • the throttling device is opened to the maximum opening degree, 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 maintains the maximum opening degree, Make the refrigerant quickly fill 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 air guide plate blows air upwards for 30s, the temperature of the coil of the outdoor heat exchanger has dropped 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 entering the mild self-cleaning mode;
  • the indoor fan can be controlled to be turned off first, and then the temperature of the coil of the outdoor heat exchanger drops to be 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; controlling the compressor to adjust to the second self-cleaning frequency; adjusting the opening degree of the throttling device so that the disc of the outdoor heat exchanger The tube temperature is less than or equal to the second preset temperature to realize frosting; when the coil temperature is less than or equal to the second preset temperature and lasts for the third preset time, control the air conditioner to switch to cooling mode; control the on-off valve to open and throttle The device closes to the minimum opening and lasts for a fourth preset time period to realize defrosting.
  • 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 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, so as to achieve frosting on the outer surface of the coil.
  • the second preset temperature is lower than the first preset temperature.
  • the second preset temperature may be -10°C. That is to say, 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. In this way, the outer surface of the coil can be frosted faster than in the mild self-cleaning mode, and the thickness of the frost layer is thicker.
  • the coil temperature of the outdoor heat exchanger is kept at a state of less than or equal to -10°C. At this time, frost forms on the outer surface of the outdoor heat exchanger and the frost layer adheres to the outside The outer surface of the coil of the heat exchanger.
  • 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 switch between the operation modes of the air conditioner is controlled by controlling the power on and off of the four-way valve, for example, the power off of the four-way valve is controlled, and the air conditioner operates in the cooling mode.
  • the on-off valve is controlled to open, the throttling device is closed to the minimum opening, and lasts for a fourth preset time period to realize defrosting.
  • 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 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 outdoor heat exchanger, and the high-temperature and high-pressure refrigerant exchanges heat with the coil of the outdoor heat exchanger, melting the frost layer on the outer surface of the outdoor heat exchanger , the dust attached to the outer surface of the outdoor heat exchanger also flows away with the melted water.
  • the high-temperature refrigerant flows back to the liquid receiver through the recovery pipeline to achieve the purpose of self-cleaning outside 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 moderate self-cleaning mode further includes, before adjusting the opening degree of the throttling device, controlling the outdoor fan to run at the lowest speed, and controlling the indoor fan to run at the second preset speed.
  • the outdoor fan before adjusting the opening degree of the throttling device, the outdoor fan is controlled to run at the lowest speed to reduce the heat exchange effect between the outdoor heat exchanger and the air, so that the outdoor disk can be accelerated.
  • the temperature reduction speed of the tube improves the self-cleaning efficiency outside 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. Set temperature.
  • the indoor fan is controlled to stop running. 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 above 30s such as adjusting to any value in 10s-1min.
  • 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 defrosting operation. Therefore, when the throttling device and the on-off valve are opened for 5 minutes, the moderate self-cleaning mode can be exited.
  • 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; controlling the compressor to adjust to the third self-cleaning frequency; adjusting the opening of the throttling device so that The coil temperature of the outdoor heat exchanger is less than or equal to the third preset temperature to realize frosting; when the coil temperature is less than or equal to the third preset temperature and lasts for the fifth preset time, the air conditioner is controlled to switch to cooling mode; The shut-off valve is opened, the throttling device is closed to the minimum opening, and lasts for the sixth preset time to realize defrosting.
  • controlling the air conditioner to run in the heating mode controlling the compressor to adjust to the third self-cleaning frequency
  • adjusting the opening of the throttling device so that The coil temperature of the outdoor heat exchanger is less than or equal to the third preset temperature to realize frosting
  • the air conditioner is controlled to switch to cooling mode
  • the shut-off valve is opened, the throttling device is closed to the minimum opening, and lasts for the sixth
  • the above-mentioned operating parameters of the deep self-cleaning in the present application can be the same as the moderate self-cleaning, namely the third self-cleaning frequency, the third preset temperature, the fifth preset duration and the sixth preset duration and other parameters Both are the same as 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: firstly controlling the air conditioner to operate for heating after the first control of opening the on-off valve and closing the throttling device to the minimum opening degree, and continuing for the sixth preset period of time. mode for the seventh preset duration.
  • 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 deep self-cleaning mode further includes: before adjusting the opening of the throttling device, controlling the outdoor fan to run at the lowest speed, and controlling the indoor fan to run at the third preset speed.
  • the outdoor fan before adjusting the opening of the throttling device, 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 coil.
  • the lowering speed of the temperature improves the self-cleaning efficiency in the tube.
  • the third 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 third preset temperature at a faster speed .
  • 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 runs twice continuously with moderate self-cleaning parameters, it is enough to produce a better defrosting effect, so when the second throttling device and the on-off valve are opened for the sixth preset time, deep self-cleaning can be exited model.
  • 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 external self-cleaning modes of this application by controlling the air conditioner to run the heating mode first, and adjusting the opening of the throttling device to make frost on the outer surface of the outdoor heat exchanger, and then control the air conditioner Switch to cooling mode, open the on-off valve, close the throttling device, and use the high-temperature and high-pressure refrigerant to exchange heat with the coil of the outdoor heat exchanger for high-temperature defrosting, so that the dust attached to the outer surface of the coil will melt with the frost layer The melted water falls together, and the refrigerant is directly returned to the inside of the liquid receiver through the recovery pipeline, so as to realize the self-cleaning of the outside of the outdoor heat exchanger.
  • the cleaning effect of the three external self-cleaning modes from mild, moderate to deep self-cleaning mode is enhanced sequentially, which can make the cleaning effect match the dust adhesion effect and realize the intelligent self-cleaning of the outdoor heat exchanger.
  • the application can use the recovery pipeline to shorten the circulation path of the refrigerant during the self-cleaning process outside the tube of the outdoor heat exchanger, and realize the high-efficiency of the high-temperature and high-pressure refrigerant and the outdoor heat exchanger. Heat exchange reduces the pressure drop along the way and improves the self-cleaning effect outside the tube.
  • FIG. 4 is a logic diagram of a possible implementation process of the method for controlling the self-cleaning outside the pipe of the 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 actual voltage value U of the outdoor fan, the operating frequency f of the compressor, and the outdoor ambient temperature Tao.
  • step S207 is executed to determine whether the cumulative time ⁇ U/Un ⁇ 1 is established, and if established, the operation is ended; otherwise, when not established, step S209 is executed.
  • 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 concerne en particulier un procédé de commande d'auto-nettoyage hors tuyau pour un échangeur de chaleur extérieur. La présente demande vise à résoudre le problème des procédés de commande d'auto-nettoyage existants qui ne peuvent pas commander le degré d'auto-nettoyage en fonction de l'encrassement d'une bobine extérieure. Dans ce but, un climatiseur de la présente demande comprend une conduite de récupération, dont une extrémité communique avec une entrée d'un échangeur de chaleur extérieur et dont l'autre extrémité communique avec un orifice d'aspiration d'un compresseur, la conduite de récupération étant pourvue d'une vanne marche-arrêt. Le procédé de commande consiste à : acquérir des paramètres de fonctionnement d'un ventilateur extérieur ; déterminer le degré d'adhérence de poussière de l'échangeur de chaleur extérieur sur la base des paramètres de fonctionnement ; et sur la base du degré d'adhérence de la poussière, exécuter un mode d'auto-nettoyage hors tuyau correspondant, le degré d'adhérence de la poussière comprenant une légère adhérence, une adhérence modérée et une forte adhérence et le mode d'auto-nettoyage hors tuyau comprend un mode d'auto-nettoyage léger, un mode d'auto-nettoyage modéré et un mode d'auto-nettoyage en profondeur. Dans la présente demande, un mode d'auto-nettoyage hors tuyau correspondant peut être exécuté sur la base du degré d'adhérence de la poussière d'un échangeur de chaleur extérieur, de manière à obtenir un auto-nettoyage hors tuyau plus intelligent.
PCT/CN2021/129802 2021-07-09 2021-11-10 Procédé de commande d'auto-nettoyage hors tuyau pour échangeur de chaleur extérieur WO2023279611A1 (fr)

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