WO2023279612A1 - Procédé de commande d'auto-nettoyage d'extérieur de tube pour échangeur de chaleur intérieur - Google Patents

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

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Publication number
WO2023279612A1
WO2023279612A1 PCT/CN2021/129814 CN2021129814W WO2023279612A1 WO 2023279612 A1 WO2023279612 A1 WO 2023279612A1 CN 2021129814 W CN2021129814 W CN 2021129814W WO 2023279612 A1 WO2023279612 A1 WO 2023279612A1
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WIPO (PCT)
Prior art keywords
self
heat exchanger
cleaning
indoor heat
controlling
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PCT/CN2021/129814
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English (en)
Chinese (zh)
Inventor
罗荣邦
崔俊
Original Assignee
青岛海尔空调器有限总公司
青岛海尔空调电子有限公司
海尔智家股份有限公司
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Publication of WO2023279612A1 publication Critical patent/WO2023279612A1/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
    • F24F11/43—Defrosting; Preventing freezing of indoor 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

Definitions

  • the invention relates to the technical field of self-cleaning of air conditioners, in particular to a method for controlling the self-cleaning outside the tube of an indoor 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 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 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 tube for the indoor heat exchanger
  • the external 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.
  • the indoor heat exchanger is configured There is an indoor fan, and the air conditioner also includes a 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 , the recovery pipeline is provided with an on-off valve, 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 operate in cooling mode; controlling the compressor to adjust to the first self-cleaning frequency; adjusting the opening of the throttling device so that the indoor 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, the air conditioner is controlled to switch to the heating mode; Controlling the opening of the on-off valve and the opening of the throttling device to a first preset opening degree and for a second preset duration to realize defrosting;
  • the moderate self-cleaning mode includes: controlling the air conditioner to operate in cooling mode; controlling the compressor to adjust to the second self-cleaning frequency; adjusting the opening of the throttling device so that the indoor 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, the air conditioner is controlled to switch to the heating mode; Controlling the opening of the on-off valve and the opening of the throttling device to a second preset opening degree for a fourth preset duration to realize defrosting;
  • the deep self-cleaning mode includes: repeating the following steps twice: controlling the air conditioner to operate in cooling mode; controlling the compressor to adjust to the third self-cleaning frequency; adjusting the opening of the throttling device so that the The coil temperature of the indoor 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 a fifth preset time, the air conditioner is controlled Switching to the heating mode; controlling the opening of the on-off valve and opening of the throttling device to a third preset opening degree, which lasts for a sixth preset duration, so as to realize defrosting.
  • the mild self-cleaning mode further includes: after controlling the air conditioner to switch to the heating mode, controlling the compressor to adjust to the outdoor The highest limit frequency corresponding to the ambient temperature; and/or
  • the mild self-cleaning mode further includes: before adjusting the opening degree of the throttling device, controlling the outdoor fan to maintain the current running state, and controlling the indoor fan to run at a preset speed; and/or
  • the first preset opening degree is the maximum opening degree of the throttling device.
  • control method also includes:
  • the on-off valve is opened and the throttling device is opened to the first preset opening for the second preset duration, the mild self-cleaning mode is exited, and the air conditioner is controlled to return to the The previous operating state of the light self-cleaning mode.
  • the moderate self-cleaning mode further includes: after controlling the air conditioner to switch to the heating mode, controlling the compressor to adjust to the outdoor The highest limit frequency corresponding to the ambient 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 highest speed, and controlling the indoor fan to stop running; and/or
  • the second preset opening degree is the maximum opening degree of the throttling device.
  • control method also includes:
  • the deep self-cleaning mode further includes: after controlling the air conditioner to switch to the heating mode, controlling the compressor to adjust to the outdoor environment The maximum limit frequency corresponding to the temperature; and/or
  • the deep self-cleaning mode further includes: before adjusting the opening of the throttling device, controlling the outdoor fan to run at the highest speed, and controlling the indoor fan to stop running; and/or
  • the third preset opening degree is the maximum opening degree of the throttling device.
  • control method also includes:
  • the deep self-cleaning mode is exited, and the air conditioner is controlled to recover The operating state before entering the deep self-cleaning mode.
  • control method also includes:
  • the indoor anti-freezing protection function and the outdoor ambient temperature frequency limiting function are turned off.
  • the indoor fan is a DC fan
  • the operating parameters include the actual speed and voltage of the indoor fan
  • the step of "judging the degree of dust adhesion of the indoor heat exchanger based on the operating parameters" further includes:
  • the ratio is greater than the third threshold, it is determined that the indoor heat exchanger is heavily attached.
  • the indoor fan is an AC fan
  • the operating parameters include the actual rotational speed and actual current value of the indoor fan
  • the step of "judging the degree of dust adhesion of the indoor 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 indoor heat exchanger, Moreover, it is also possible to implement a matching external-tube self-cleaning mode based on the degree of dust adhesion of the indoor heat exchanger to achieve a more intelligent external-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 outside 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 the self-cleaning outside the tube of the indoor heat exchanger of the present application.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • FIG. 1 is a system diagram of the air conditioner of the present application in cooling mode.
  • the air conditioner includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttling device 4, an indoor heat exchanger 5, and a liquid 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 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 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 heating mode
  • Fig. 3 is a flow chart of the control method for the self-cleaning outside the pipe of the indoor heat exchanger of the present application.
  • the external self-cleaning control method of the indoor heat exchanger of the present application includes:
  • the operating parameters of the indoor fan include actual rotational speed, actual current value, actual voltage value, etc., and one or more of the above-mentioned operating parameters of the indoor fan is obtained 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 indoor 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 of the indoor 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 of the indoor 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 indoor 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 indoor heat exchanger.
  • External self-cleaning and can also implement a corresponding degree of external self-cleaning mode based on the degree of dust adhesion of the indoor heat exchanger, so that the self-cleaning effect can adapt to the degree of dust adhesion, and achieve more intelligent external self-cleaning.
  • the indoor fan is a DC fan
  • the operating parameters include the actual rotational speed and actual voltage value of the indoor fan.
  • Obtaining the operating parameters of the indoor fan means obtaining the actual rotational speed and actual voltage value of the indoor fan.
  • the method of obtaining the actual rotational speed and the actual voltage value of the indoor fan belongs to a conventional method in the field, and will not be repeated here.
  • the step of "judging the degree of dust adhesion of the indoor heat exchanger based on the operating parameters" further includes:
  • the theoretical voltage value is determined based on experiments. Specifically, for different speeds of the indoor fan, under the same load (such as indoor heat exchanger without dust adhesion), the input current value is fixed, and then the bus voltage value at each speed is recorded as the indoor fan at that speed. The theoretical voltage value.
  • the actual load of the indoor fan changes. When the speed remains unchanged, if it still wants to reach the speed, the air conditioner will automatically adjust the input voltage value of the indoor fan. And the greater the load, the greater the regulated input voltage value. Therefore, the comparison between the actual voltage value of the indoor fan and its theoretical voltage value can be used to determine whether there is dust adhesion in the indoor 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.
  • ⁇ U/Un ⁇ 1 it is considered that the dust adhesion degree of the indoor heat exchanger is not large, and self-cleaning is not required; if 1 ⁇ U/Un ⁇ 1.1, the indoor heat exchanger is considered to be slightly attached; if 1.1 ⁇ U/Un ⁇ 1.5, the indoor heat exchanger is considered to be moderately attached; if ⁇ U/Un>1.5, considered to be The indoor heat exchanger is heavily attached.
  • the indoor fan is an AC fan
  • the operating parameters include the actual rotational speed and actual current value of the indoor fan.
  • Obtaining the operating parameters of the indoor fan means obtaining the actual rotational speed and actual current value of the indoor fan.
  • the method of obtaining the actual rotational speed and the actual current value of the indoor fan belongs to a conventional method in the field, and will not be repeated here.
  • the step of "judging the degree of dust adhesion of the indoor 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 speeds of the indoor fan, under the same load (such as the indoor heat exchanger without dust attached), record the input current value at each speed as the The theoretical current value of the indoor fan at this speed.
  • the actual load of the indoor fan changes.
  • the air conditioner will automatically adjust the input current value of the indoor fan.
  • the greater the load the greater the regulated input current value. Therefore, the comparison between the actual current value of the indoor fan and its theoretical current value can be used to determine whether the indoor heat exchanger has dust adhesion 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.
  • ⁇ I/In ⁇ 1 it is considered that the dust adhesion degree of the indoor heat exchanger is not large and self-cleaning is not required; if 1 ⁇ I/In ⁇ 1.1, the indoor heat exchanger is considered to be slightly attached; if 1.1 ⁇ I/In ⁇ 1.5, the indoor heat exchanger is considered to be moderately attached; if ⁇ I/In>1.5, considered to be The indoor heat exchanger is heavily attached.
  • the mild self-cleaning mode includes: controlling the air conditioner to operate in cooling mode; controlling the compressor to adjust to the first self-cleaning frequency; adjusting the opening of the throttling device to allow indoor heat exchange
  • the coil temperature of the air conditioner 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 the heating mode ; Control the on-off valve to open, the throttling device to open to the first preset opening, and last for the second preset time to realize defrosting on the outer surface of the coil.
  • 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.
  • 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, so as to achieve frosting on the outer surface of the coil.
  • 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. Due to the dust attached to the outer surface of the indoor heat exchanger, frosting will appear on the outer surface of the coil after the temperature of the coil drops to a certain temperature and lasts for a certain period of time.
  • the first preset temperature in this application can be set to -1°C to -10°C, and in this application, the first preset temperature can be -5°C. That is to say, 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 is kept at a state of less than or equal to -5°C, and frost will form on the outer surface of the indoor heat exchanger at this time.
  • 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 switch between the operation modes of the air conditioner is controlled by controlling the four-way valve to be powered on and off, for example, the four-way valve is controlled to be powered on, and the air conditioner operates in the heating mode.
  • 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 to realize defrosting.
  • 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 exchanges heat with the coil of the indoor heat exchanger, melting the frost layer on the outer surface of the indoor heat exchanger , the dust attached to the outer surface of the indoor 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 indoor heat exchanger. Control the throttling device to open to the maximum opening, so that the high-temperature and high-pressure refrigerant can pass quickly, reduce the pressure drop during the refrigerant flow process, and improve the self-cleaning effect outside 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 mild self-cleaning mode further includes: before adjusting the opening degree of the throttling device, controlling the outdoor fan to maintain the current running state, and controlling the indoor fan to run at a preset speed.
  • the mild self-cleaning mode since the dust adhesion 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 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 complete the defrosting operation. Therefore, when the throttling device and the on-off valve are opened 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 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 run in cooling mode; controlling the compressor to adjust to the second self-cleaning frequency; adjusting the opening of the throttling device so that the coil of the indoor heat exchanger The 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 heating mode; control the on-off valve to open and throttle The device is opened to the second preset opening degree and lasts for a fourth preset duration to realize defrosting.
  • 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.
  • 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, 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 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. 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 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 switch between the operation modes of the air conditioner is controlled by controlling the four-way valve to be powered on and off, for example, the four-way valve is controlled to be powered on, and the air conditioner operates in the heating mode.
  • the on-off valve is controlled to be opened, and the throttling device is opened to a second preset opening degree, and lasts for a fourth preset duration to realize defrosting.
  • 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 exchanges heat with the coil of the indoor heat exchanger, melting the frost layer on the outer surface of the indoor heat exchanger , the dust attached to the outer surface of the indoor 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 indoor heat exchanger. Control the throttling device to open to the maximum opening, so that the high-temperature and high-pressure refrigerant can pass quickly, reduce the pressure drop during the refrigerant flow process, and improve the self-cleaning effect outside 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 moderate self-cleaning mode further includes, before adjusting the opening degree of the throttling device, controlling the outdoor fan to run at the highest speed, and controlling the indoor fan to stop running.
  • the moderate self-cleaning mode since 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 outside the tube.
  • 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 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 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; controlling the compressor to adjust to the third self-cleaning frequency; adjusting the opening of the throttling device so that the indoor The coil temperature of the 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 the heating mode; The shut-off valve is opened, the throttling device is opened to the third preset opening degree, and lasts for the sixth preset time period to realize defrosting.
  • controlling the air conditioner to run in cooling mode controlling the compressor to adjust to the third self-cleaning frequency
  • adjusting the opening of the throttling device so that the indoor The coil temperature of the heat exchanger is less than or equal to the third preset temperature to realize frosting
  • the air conditioner is controlled to switch to the heating mode
  • the shut-off valve is opened, the throttling device is opened to the third preset
  • 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 deep self-cleaning mode further includes: before adjusting the opening degree of the throttling device, controlling the outdoor fan to run at the highest speed, and controlling the indoor fan to stop running.
  • the refrigerant in the outdoor heat exchanger and the environment can be improved.
  • the heat exchange effect between them 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 outside the tube.
  • 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 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 start after the coil temperature of the indoor heat exchanger has dropped to a temperature suitable for the cooling mode. run.
  • the three external 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 to make frost on the outer surface of the indoor heat exchanger, and then control the air conditioner to switch In the heating mode, open the on-off valve and throttling device, and use the high-temperature and high-pressure refrigerant to exchange heat with the coil of the indoor heat exchanger to perform 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 indoor heat exchanger outside the tube.
  • the cleaning effect of the three external self-cleaning modes from mild, moderate to deep self-cleaning mode is enhanced sequentially, which can match the cleaning effect with the dust adhesion effect and realize intelligent self-cleaning of the indoor heat exchanger.
  • the application can use the recovery pipeline to shorten the circulation path of the refrigerant during the self-cleaning process of the indoor heat exchanger outside the tube, and realize the high-efficiency of the high-temperature and high-pressure refrigerant and the indoor 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 tube of the indoor heat exchanger of the present application.
  • the air conditioner starts to cool and run, and then performs the following operations:
  • step S201 is executed to acquire the actual rotational speed r and the actual voltage value U of the outdoor fan.
  • step S205 is executed to judge whether the accumulated time ⁇ U/Un ⁇ 1 is established, and if established, the operation is ended; otherwise, when not established, step S207 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 pour des climatiseurs et en particulier un procédé de commande d'auto-nettoyage d'extérieur de tube pour un échangeur de chaleur intérieur. La présente demande vise à résoudre le problème selon lequel des procédés de commande d'auto-nettoyage dans l'état de la technique ne peuvent pas commander le degré d'auto-nettoyage en fonction de l'encrassement de l'échangeur de chaleur intérieur. À cet effet, le climatiseur de la présente demande comprend une conduite de récupération dont une extrémité est en communication avec une sortie de l'échangeur de chaleur extérieur et l'autre extrémité en communication avec un orifice d'aspiration d'air d'un compresseur. La conduite de récupération est pourvue d'une soupape marche-arrêt. Le procédé de commande consiste à : acquérir un paramètre de fonctionnement d'un ventilateur intérieur ; déterminer un degré d'adhérence de poussière à l'échangeur de chaleur intérieur sur la base du paramètre de fonctionnement ; et exécuter un mode d'auto-nettoyage d'extérieur de tube correspondant au degré d'adhérence de poussière. Les degrés d'adhérence de poussière comprennent l'adhérence légère, l'adhérence moyenne et l'adhérence sévère. Les modes d'auto-nettoyage d'extérieur de tube comprennent un mode d'auto-nettoyage léger, un mode d'auto-nettoyage moyen et un mode d'auto-nettoyage profond. La présente demande permet d'obtenir un auto-nettoyage d'extérieur de tube plus intelligent en exécutant un mode d'auto-nettoyage d'extérieur de tube correspondant au degré d'adhérence de poussière à l'échangeur de chaleur intérieur.
PCT/CN2021/129814 2021-07-09 2021-11-10 Procédé de commande d'auto-nettoyage d'extérieur de tube pour échangeur de chaleur intérieur WO2023279612A1 (fr)

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