WO2023284200A1 - 室内换热器的管内自清洁控制方法 - Google Patents

室内换热器的管内自清洁控制方法 Download PDF

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Publication number
WO2023284200A1
WO2023284200A1 PCT/CN2021/129813 CN2021129813W WO2023284200A1 WO 2023284200 A1 WO2023284200 A1 WO 2023284200A1 CN 2021129813 W CN2021129813 W CN 2021129813W WO 2023284200 A1 WO2023284200 A1 WO 2023284200A1
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WIPO (PCT)
Prior art keywords
self
valve
cleaning
heat exchanger
indoor heat
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PCT/CN2021/129813
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English (en)
French (fr)
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 WO2023284200A1 publication Critical patent/WO2023284200A1/zh

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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
    • F24F11/67—Switching between heating and cooling modes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the invention relates to the technical field of self-cleaning of air conditioners, in particular to a method for controlling self-cleaning in tubes of indoor heat exchangers.
  • the dirty blockage of the heat exchanger mainly includes the dirty blockage outside the tube and the dirty blockage inside the tube.
  • the heat transfer coefficient decreases, and the heat transfer effect between the heat exchanger and the air becomes worse.
  • the internal fouling of the tube is mainly due to the reduction of the heat transfer coefficient between the refrigerant and the heat exchanger coil, which affects the energy transfer of the refrigerant in the tube to the outside.
  • the main factor affecting the internal blockage of the tube is the refrigeration oil.
  • the refrigeration oil in the compressor flows to the hairpin tube of the heat exchanger along with the refrigerant. Since the hairpin pipe is an internally threaded copper pipe, the flow of the refrigeration oil is affected. In addition, the refrigerant flow Due to the centrifugal force, part of the refrigerating machine oil cannot return to the inside of the compressor in time, and stays on the inner wall of the threaded copper tube, which hinders the heat transfer between the refrigerant and the coil, reduces the heat transfer temperature difference, and makes the cooling and heating effect of the air conditioner worse. .
  • the application provides a self-cleaning control method in the tube of the indoor heat exchanger, which is applied to the air conditioner.
  • the air conditioner includes a compressor, a four-way valve, an outdoor heat exchanger, a throttling device, and an indoor heat exchanger that are sequentially connected through a refrigerant pipeline.
  • the air conditioner also includes a recovery pipeline, a first on-off valve and a second on-off valve.
  • the first on-off valve is set on the refrigerant pipeline between the throttling device and the indoor heat exchanger, and one end of the recovery pipeline is set on the throttling device and the On the refrigerant pipeline between the first on-off valves, the other end of the recovery pipeline communicates with the suction port of the compressor, the second on-off valve is arranged on the recovery pipeline,
  • the self-cleaning control method in the pipe includes:
  • the air conditioner is controlled to operate in heating mode, and the first on-off valve and the second on-off valve are controlled to be opened.
  • the air conditioner further includes a third on-off valve, and the third on-off valve is arranged between the indoor heat exchanger and the four-way valve.
  • the self-cleaning control method in the pipeline further includes:
  • the third on-off valve is controlled to open.
  • valve opening conditions include at least one of the following conditions:
  • the exhaust temperature is greater than or equal to the exhaust temperature threshold and lasts for a first set time
  • the exhaust pressure is greater than or equal to the exhaust pressure threshold and lasts for a second set time
  • the inspiratory pressure is less than or equal to the inspiratory pressure threshold and lasts for a third set time.
  • the in-pipe self-cleaning control method further includes:
  • the indoor fan is controlled to stop running.
  • the in-pipe self-cleaning control method further includes:
  • the self-cleaning mode in the pipe is exited.
  • the step of "exiting the in-tube self-cleaning mode" further includes:
  • the second on-off valve is controlled to be closed.
  • the in-pipe self-cleaning control method further includes:
  • controlling the throttling device After controlling the throttling device to open to the preset opening for a fifth set time, controlling the throttling device to return to the opening before entering the self-cleaning mode in the pipe; and/or
  • the compressor After the compressor maintains the operation at the self-cleaning frequency for a sixth set time, the compressor is controlled to return to the operation at the frequency before entering the self-cleaning mode in the pipe.
  • the step of "exiting the in-tube self-cleaning mode" further includes:
  • the indoor fan and the air deflector are controlled to return to the operating state before entering the self-cleaning mode in the pipe.
  • the preset opening degree is the maximum opening degree of the throttling device.
  • the self-cleaning frequency is the highest limit frequency corresponding to the outdoor ambient temperature.
  • the air conditioner includes a compressor, a four-way valve, an outdoor heat exchanger, a throttling device, and an indoor heat exchanger that are sequentially connected through a refrigerant pipeline.
  • pipeline, the first on-off valve and the second on-off valve, the first on-off valve is set on the refrigerant pipeline between the throttling device and the indoor heat exchanger, and one end of the recovery pipeline is set on the throttling device and the first On the refrigerant pipeline between the on-off valves, the other end of the recovery pipeline communicates with the suction port of the compressor, and the second on-off valve is arranged on the recovery pipeline.
  • the self-cleaning control method in the pipeline includes: responding to the received outdoor The heat exchanger performs self-cleaning instructions in the pipe and enters the self-cleaning mode in the pipe; controls the cooling operation of the air conditioner; controls the first on-off valve, the second on-off valve to close, and the throttling device to close to the minimum opening; controls the compressor to adjust to Preset self-cleaning frequency; obtain the discharge temperature, discharge pressure and/or suction pressure of the compressor every first interval; based on the obtained discharge temperature, discharge pressure and/or suction pressure, judge Whether the valve-opening condition is satisfied; when the valve-opening condition is satisfied, control the heating operation of the air conditioner, and control the opening of the first on-off valve and the second on-off valve.
  • the control method of the present application can realize the self-cleaning of the indoor heat exchanger, and solve the problem of internal dirt blockage of the indoor heat exchanger. Specifically, by first controlling the cooling operation of the air conditioner, and controlling the closing of the first on-off valve and the second on-off valve, the throttling device is closed to the minimum opening, so that the refrigerant discharged from the compressor is accumulated in the outdoor heat exchanger and the compressor. In the air conditioner, the refrigerant is recovered, and the refrigerant is stored in the outdoor heat exchanger and compressor, and the air conditioner is controlled when the valve opening condition is established based on the discharge temperature, discharge pressure and/or suction pressure of the compressor.
  • Heating operation, and opening the first on-off valve and the second on-off valve can use the rapid flow of high-temperature and high-pressure refrigerant to effectively flush the inside of the coil of the indoor heat exchanger, and wash away the oil on the inner wall of the coil and follow it.
  • the refrigerant is directly returned to the inside of the compressor through the recovery pipeline to realize self-cleaning of the indoor heat exchanger.
  • the oil stain can be directly brought back to the compressor for recovery during the self-cleaning process, reducing the flow stroke of the high-temperature refrigerant, reducing the pressure drop of the refrigerant, improving the self-cleaning effect, saving self-cleaning time, and ensuring user experience.
  • Fig. 1 is the system diagram of the air conditioner of the present application in cooling mode
  • Fig. 2 is the system diagram of the air conditioner of the present application in heating mode
  • Fig. 3 is the flowchart of the self-cleaning control method in the tube of the indoor heat exchanger of the present application
  • Fig. 4 is a logic diagram of a possible implementation process of the method for controlling self-cleaning in tubes of indoor heat exchangers of the present application.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • FIG. 1 is a system diagram of the air conditioner of the present application in cooling mode.
  • the air conditioner includes a compressor 1 , a four-way valve 2 , an outdoor heat exchanger 3 , a throttling device 4 , an indoor heat exchanger 5 and a liquid accumulator 11 .
  • 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 in communication with the E port of the four-way valve 2, the S port of the four-way valve 2 is in communication with the inlet of the accumulator 11 through the refrigerant pipeline 6, and the outlet of the accumulator 11 is in communication with the suction port of the compressor 1 through the pipeline .
  • the throttling device 4 is preferably an electronic expansion valve, and a filter screen is arranged in the accumulator 11, and the accumulator 11 can play functions such as storing refrigerant, separating gas and liquid of refrigerant, filtering oil, silencing sound, and buffering refrigerant.
  • the air conditioner also includes a first on-off valve 8, a second on-off valve 9 and a recovery pipeline 7, the first on-off valve 8 and the second on-off valve 9 are preferably electromagnetic valves, and the first on-off valve 8 is Normally open valve, which is arranged on the refrigerant pipeline 6 between the throttling device 4 and the indoor heat exchanger 5, the second on-off valve 9 is a normally closed valve, which is arranged on the recovery pipeline 7, and the recovery pipeline 7 A copper tube with a smooth inner wall is used. The first end of the copper tube is set on the refrigerant pipeline 6 between the throttling device 4 and the first on-off valve 8, and the second end of the copper tube is set on the S of the four-way valve 2.
  • Both the first on-off valve 8 and the second on-off valve 9 are communicatively connected with the controller of the air conditioner, so as to receive opening and closing signals issued by the controller.
  • the controller of the air conditioner so as to receive opening and closing signals issued by the controller.
  • one or more of the above-mentioned on-off valves can also be replaced by electronically controlled valves such as electronic expansion valves.
  • FIG. 2 is a system diagram of the air conditioner of the present application in heating mode
  • FIG. 3 is a flow chart of the control method of the indoor heat exchanger for self-cleaning in the tube of the present application.
  • the self-cleaning control method in the tube of the indoor heat exchanger of the present application includes:
  • the instruction to perform self-cleaning in the tube of the indoor heat exchanger can be issued by the user actively, such as sending an instruction to the air conditioner through a button on the remote control, or sending an instruction through a terminal communicatively connected with the air conditioner,
  • the terminal can be an APP installed on the smart device, and the APP sends instructions to the air conditioner directly or through the cloud.
  • smart devices include but are not limited to mobile phones, tablet computers, smart speakers, smart watches, etc.
  • the ways of communication and connection between smart devices and air conditioners or the cloud include but not limited to wifi, bluetooth, infrared, 3G/4G/5G, etc.
  • the air conditioner After the air conditioner receives an instruction to perform in-pipe self-cleaning on the indoor heat exchanger, it switches the operating mode to the in-pipe self-cleaning mode, and starts to perform in-pipe self-cleaning on the coil of the indoor heat exchanger.
  • the in-pipe self-cleaning mode can be a computer program, which is pre-stored in the air conditioner. When operating this mode, the air conditioner controls the operation of each component of the air conditioner according to the steps set by the program.
  • the self-cleaning instruction can also be automatically issued when the air conditioner meets certain entry conditions, such as issuing an instruction to perform in-pipe self-cleaning on the indoor heat exchanger when the cumulative operating time of the air conditioner reaches a preset duration, where the preset duration is, for example, It can be 20h-40h.
  • the switch between cooling and heating of the air conditioner is 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 When powered on, the air conditioner runs in heating mode. In this embodiment, after entering the self-cleaning mode in the pipe, 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 the non-cooling mode, the air conditioner is controlled to switch to the cooling mode.
  • the first on-off valve is controlled to be closed
  • the refrigerant pipeline between the throttling device and the indoor heat exchanger is throttled
  • the second on-off valve is controlled to be closed
  • the recovery pipeline is throttled to control
  • the electronic expansion valve is closed to the minimum opening, that is, the opening is 0.
  • the electronic expansion valve realizes full throttling, and the refrigerant cannot flow through.
  • the refrigerant in the indoor heat exchanger is discharged by the compressor and all accumulated in the outdoor heat exchanger and compressor, realizing the recovery of the refrigerant in the indoor heat exchanger.
  • the self-cleaning frequency is a frequency determined in advance through experiments. This frequency can be close to or reach the maximum operating frequency of the compressor.
  • the pressure of the refrigerant discharged from the exhaust port will Both the temperature and temperature are high, so the refrigerant discharged from the compressor can be quickly heated and boosted.
  • the self-cleaning frequency is 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 equipped with protective measures. Under different outdoor ambient temperatures, the corresponding maximum frequency limit is set.
  • the self-cleaning frequency in this application is the maximum frequency limit of the compressor at the current outdoor ambient temperature. Under the limit value, the compressor can realize the rapid increase of the pressure and temperature of the refrigerant at the exhaust port in the shortest time. Wherein, the manner of obtaining the outdoor ambient temperature is a conventional means in the field, and will not be repeated here.
  • the self-cleaning frequency may exist. Different, so those skilled in the art can set the self-cleaning frequency based on the specific application scenario, as long as the setting of the frequency can enable the compressor to achieve a rapid increase in the pressure and temperature of the refrigerant at the exhaust port in a short time .
  • the discharge temperature of the compressor can be obtained by setting a temperature sensor at the discharge port of the compressor
  • the discharge pressure can be obtained by setting a pressure sensor at the discharge port of the compressor
  • the suction pressure can be obtained by Obtained by installing a pressure sensor at the suction port of the compressor.
  • the first interval time can be any value from 1s to 5s, and the selection of this value is related to the change speed of exhaust temperature, exhaust pressure, suction pressure and the control accuracy to be achieved in this application.
  • the first interval time can be selected as 1s, 2s or shorter
  • the first interval time can be selected as 4s or 5s or longer.
  • the first interval time is selected as 1s, and the exhaust temperature, exhaust pressure and suction pressure all need to be obtained. That is to say, after the compressor reaches the self-cleaning frequency, the discharge temperature, discharge pressure and suction pressure of the compressor are simultaneously acquired every 1s.
  • the valve opening condition includes at least one of the following conditions: (1) the exhaust temperature is greater than or equal to the exhaust temperature threshold and lasts for a first set time; (2) the exhaust pressure is greater than or equal to the exhaust pressure threshold and lasts for the second set time; (3) the inspiratory pressure is less than or equal to the inspiratory pressure threshold and lasts for the third set time.
  • the discharge temperature is greater than or equal to the discharge temperature threshold and lasts for the first set time, it proves that the refrigerant after the discharge port of the compressor has reached a relatively high temperature at this time.
  • valve opening conditions are only a more preferred implementation mode.
  • those skilled in the art can adjust the above-mentioned valve opening conditions, as long as the adjusted conditions can correctly judge The state of the refrigerant accumulated after the compressor is sufficient.
  • the valve opening condition may only include one or two of the above three conditions; or the valve opening condition may only include the judgment of temperature/pressure, while omitting the judgment of duration.
  • the air conditioner is controlled to operate in heating mode, and the first on-off valve and the second on-off valve are controlled to be opened.
  • the refrigerant recovered to the outdoor heat exchanger and compressor is discharged in the form of high temperature and high pressure under the action of the compressor, and quickly flows to the indoor heat exchanger.
  • the rapid flow impacts and cleans the oil stains attached to the inner wall of the coil of the indoor heat exchanger, and directly recovers the washed oil stains through the recovery pipeline into the liquid receiver to realize the filtration of oil stains and the recovery of engine oil, and then in the compressor Under compression, it is discharged through the exhaust port again to realize the circulation of refrigerant.
  • the refrigerant discharged from the compressor is accumulated in the outdoor heat exchanger and the compressor. machine, so as to realize the recovery of refrigerant.
  • the valve opening condition is determined based on the discharge temperature, discharge pressure and suction pressure of the compressor, the first on-off valve and the second on-off valve are opened, and the temperature and pressure of the refrigerant increase rapidly in a short period of time.
  • the application can use the recovery pipeline to recover the refrigeration oil during the self-cleaning process of the indoor heat exchanger, and realize the high-temperature and high-pressure refrigerant in the indoor heat exchanger.
  • the oil will be directly brought back to the reservoir for recovery and filtration without going through the outdoor heat exchanger again, and then compressed and discharged by the compressor again, which reduces the flow stroke of high-temperature refrigerant, reduces the pressure drop along the process, and improves Self-cleaning effect in the tube.
  • the recovered refrigerating machine oil can be filtered to prevent impurities in the refrigerating machine oil from continuing to participate in the refrigerant cycle.
  • the air conditioner also includes a third on-off valve 10, the third on-off valve 10 is preferably a solenoid valve, the third on-off valve 10 is a normally open valve, which is set at On the refrigerant pipeline 6 between the indoor heat exchanger 5 and the four-way valve 2 , the third on-off valve 10 is communicatively connected with the controller of the air conditioner to receive opening and closing signals issued by the controller.
  • the third on-off valve 10 can also be replaced by an electronically controlled valve such as an electronic expansion valve.
  • the self-cleaning control method in the pipe also includes: controlling the third on-off valve to close after the cooling operation of the air conditioner lasts for a preset delay time; The third on-off valve is opened.
  • the preset delay time can be any value from 10s to 1min. In this application, it is 30s.
  • the refrigerant in the indoor heat exchanger is basically recovered to the outdoor heat exchanger and In the compressor, the third on-off valve is closed at this time to prevent the refrigerant from flowing back, and ensure that the temperature and pressure of the compressor are rapidly increased to reach the valve-opening condition.
  • the third on-off valve is opened, so that the refrigerant recovered in the outdoor heat exchanger and the compressor can quickly impact the coil of the indoor heat exchanger, and the indoor heat exchanger is self-cleaned.
  • the method for controlling self-cleaning in pipes further includes: controlling the indoor fan to stop running while or after controlling the heating operation of the air conditioner. Specifically, during the heating operation, the high temperature and high pressure of the refrigerant is used to flush the indoor heat exchanger. At this time, if the indoor fan is turned on, the self-cleaning effect will be affected. Therefore, the indoor fan is controlled to stop running to ensure the indoor heat exchanger. Self-cleaning effect. In addition, if the air conditioner is running in the cooling mode before entering the self-cleaning mode in the duct, then turning off the indoor fan at this time can avoid the excessive temperature of the outlet air and affect the user experience.
  • the method for controlling self-cleaning in pipes further includes: exiting the self-cleaning mode in pipes after controlling the heating operation of the air conditioner for a fourth set time.
  • the fourth set time can be any value in 3min-10min, preferably 5min in this application.
  • the step of exiting the self-cleaning mode in the pipe further includes: controlling the air conditioner to resume the mode operation before entering the self-cleaning mode in the pipe, controlling the compressor to maintain the self-cleaning frequency operation, controlling the throttling device to open to a preset opening degree, controlling the second The on-off valve is closed.
  • the air conditioner needs to return to the operating mode before the in-pipe self-cleaning, so as to continue to adjust the indoor temperature. Still taking the cooling operation of the air conditioner before entering the in-pipe cleaning mode as an example, after executing the in-pipe self-cleaning mode, it is necessary to switch back to the cooling mode.
  • control the four-way valve to power off to restore the refrigeration mode control the compressor to maintain the self-cleaning frequency operation, control the electronic expansion valve to open to the preset opening degree, and control the second on-off valve to close, so that the refrigerant will operate at the normal cooling mode. flow to flow.
  • the preset opening is the maximum opening of the throttling device. Since most of the refrigerant circulates between the compressor and the indoor heat exchanger during the operation of the self-cleaning mode in the pipe, resulting in the lack of refrigerant in the outdoor heat exchanger, it will save energy.
  • the flow device is adjusted to the maximum opening, so that the refrigerant can quickly fill the outdoor heat exchanger, so as to realize the normal circulation of the refrigerant as soon as possible.
  • the compressor still runs at the self-cleaning frequency, which is the highest limit frequency, which can increase the circulation speed of the refrigerant and quickly reduce the coil temperature of the indoor heat exchanger.
  • the throttling device is controlled to open to a preset opening degree for a fifth set time
  • the throttling device is controlled to return to the opening degree before entering the self-cleaning mode in the pipe.
  • the fifth setting time can be any value within 1min-5min, and it is preferably 3min in this application.
  • the electronic expansion valve operates at the maximum opening for 3min, the refrigerant circulation has tended to be stable.
  • the electronic expansion valve is controlled to return to The opening before entering the self-cleaning mode in the pipe, so that the electronic expansion valve can fully restore the refrigeration parameters before entering the self-cleaning mode in the pipe and continue to operate.
  • the compressor is controlled to return to the frequency before entering the self-cleaning mode in the pipe.
  • the sixth setting time can be any value within 1min-5min, and it is still preferably 3min in this application.
  • the way to exit the self-cleaning mode in the pipe is not limited to the above-mentioned one.
  • the air conditioner can be restored to the operating state before entering the self-cleaning mode in the pipe
  • those skilled in the art can freely choose a specific control method. The selection did not depart from the principles of the application. For example, it is possible to directly control all components to return to the operating state before entering the self-cleaning mode in the tube, or to control one or several components to return to the operating state before entering the self-cleaning mode in the tube, and then gradually restore all components to the operating state before entering the self-cleaning mode in the tube.
  • the operating state before entering the in-line self-cleaning mode.
  • FIG. 4 is a logic diagram of a possible implementation process of the control method for self-cleaning in tubes of indoor heat exchangers of the present application.
  • the air conditioner enters the self-cleaning mode in the pipe, that is, the cooling operation of the air conditioner is controlled, the first on-off valve and the second on-off valve are closed, the electronic expansion valve is closed to the minimum opening, and the compressor is controlled after running for 30s.
  • the three-way shut-off valve is closed to realize the recovery of indoor refrigerant.
  • step S203 is executed to control the frequency of the compressor to increase to the highest limit frequency corresponding to the outdoor ambient temperature.
  • step S205 is executed to acquire the discharge temperature Td, discharge pressure Pd and suction pressure Ps of the compressor.
  • step S207 is executed to determine whether at least one of Td ⁇ T, Pd ⁇ P1 and Ps ⁇ P2 holds true, where T is the exhaust temperature threshold, P1 is the exhaust pressure threshold, and P2 is the suction pressure threshold.
  • T is the exhaust temperature threshold
  • P1 is the exhaust pressure threshold
  • P2 is the suction pressure threshold.
  • step S211 is executed to judge whether the duration of heating operation t1 ⁇ 5min is established; if the judgment result is true, then step S213 is executed; otherwise, when the judgment result is not established, then return to continue execution of step S211.
  • S213 exit the self-cleaning mode in the pipe, specifically, control the air conditioner to operate in the cooling mode, open the electronic expansion valve to the maximum opening, keep the self-cleaning frequency of the compressor, turn on the indoor fan and send air upwards through the air deflector, and control the second on-off The valve is closed.
  • step S215 is executed to determine whether the time t2 ⁇ 30s for the indoor fan to be turned on is established; if the judgment result is established, execute step S217, otherwise, return to continue executing step S215;
  • step S219 to judge whether the duration of the cooling mode t3 ⁇ 3min is established; if the judgment result is true, execute step S221; otherwise, if the judgment result is not established, return to continue to execute step S219.
  • 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.
  • step S207 is described in conjunction with simultaneously judging the three conditions of Td ⁇ T, Pd ⁇ P1 and Ps ⁇ P2, those skilled in the art can understand that the above three conditions can also be judged sequentially.

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Abstract

一种室内换热器的管内自清洁控制方法，应用于空调器，该空调器设置有第一通断阀、第二通断阀和回收管路，控制方法包括：响应于接收到的进行管内自清洁的指令，进入管内自清洁模式；控制空调器制冷运行；控制第一通断阀、第二通断阀关闭、节流装置关闭到最小开度；控制压缩机调整至预设的自清洁频率；每隔第一间隔时间根据获取到的排气温度、排气压力和/或吸气压力，判断开阀条件是否成立；在成立时，控制空调器制热运行，并且控制第一通断阀和第二通断阀打开。

Description

室内换热器的管内自清洁控制方法 技术领域
本发明涉及空调自清洁技术领域，具体涉及一种室内换热器的管内自清洁控制方法。
背景技术
空调在使用一段时间后，制冷制热效果会变差。影响制冷制热效果的因素有很多，其中换热器脏堵为主要原因之一。对于室内换热器来说，其脏堵主要包括管外脏堵和管内脏堵，管外脏堵主要由于室内的灰尘杂质等积聚换热器的翅片间隙而影响送风效果，导致管外换热系数降低，换热器与空气之间的换热效果变差。管内脏堵主要由于冷媒与换热器盘管之间的换热系数降低，影响管内冷媒的能量向外传递。其中，影响管内脏堵的主要因素为冷冻机油，压缩机里面冷冻机油伴随冷媒流动到换热器的发卡管，由于目前发卡管为内螺纹铜管，影响冷冻机油的流动，再加上冷媒流动的离心力作用，导致部分冷冻机油不能及时返回压缩机内部，停留在螺纹状的铜管内壁，阻碍了冷媒与盘管之间的传热，降低了传热温差，使空调制冷制热效果变差。
室内换热器的管外脏堵还可以通过人为定期清洗、或者空调结霜化霜操作等方式去除表面灰尘杂质，但是管内脏堵不仅是影响空调的制冷制热效果的主要因素之一，而且还无法手动清洁。因此，如何对室内换热器进行管内清洁成为空调厂家亟待解决的问题。
相应地，本领域需要一种新的室内换热器的管内自清洁控制方法来解决上述问题。
发明内容
为了解决现有技术中的上述至少一个问题，即为了解决如何实现室内换热器的管内自清洁的问题，本申请提供了一种室内换热器的管内自清洁控制方法，应用于空调器，所述空调器包括通过冷媒管路依次连接的压缩机、四通阀、室外换热器、节流装置、室内换热器，所述空调器 还包括回收管路、第一通断阀和第二通断阀，所述第一通断阀设置于所述节流装置与所述室内换热器之间的冷媒管路上，所述回收管路的一端设置于所述节流装置与所述第一通断阀之间的冷媒管路上，所述回收管路的另一端与所述压缩机的吸气口连通，所述第二通断阀设置于所述回收管路上，
所述管内自清洁控制方法包括：
响应于接收到的对所述室内换热器进行管内自清洁的指令，进入管内自清洁模式；
控制所述空调器制冷运行；
控制所述第一通断阀、所述第二通断阀关闭、所述节流装置关闭到最小开度；
控制所述压缩机调整至预设的自清洁频率；
每隔第一间隔时间获取所述压缩机的排气温度、排气压力和/或吸气压力；
基于获取到的所述排气温度、所述排气压力和/或所述吸气压力，判断开阀条件是否成立；
在所述开阀条件成立时，控制所述空调器制热运行，并且控制所述第一通断阀和所述第二通断阀打开。
在上述室内换热器的管内自清洁控制方法的优选技术方案中，所述空调器还包括第三通断阀，所述第三通断阀设置于所述室内换热器与所述四通阀之间的冷媒管路上，所述管内自清洁控制方法还包括：
在所述空调器制冷运行并持续预设延迟时间后，控制所述第三通断阀关闭；以及
在所述开阀条件成立时，控制所述第三通断阀打开。
在上述室内换热器的管内自清洁控制方法的优选技术方案中，所述开阀条件包括下列条件中的至少一个：
所述排气温度大于等于排气温度阈值且持续第一设定时间；
所述排气压力大于等于排气压力阈值且持续第二设定时间；
所述吸气压力小于等于吸气压力阈值且持续第三设定时间。
在上述室内换热器的管内自清洁控制方法的优选技术方案中，所述管内自清洁控制方法还包括：
在控制所述空调器制热运行的同时或之后，控制室内风机停止运行。
在上述室内换热器的管内自清洁控制方法的优选技术方案中，所述管内自清洁控制方法还包括：
在控制所述空调器制热运行并持续第四设定时间后，退出所述管内自清洁模式。
在上述室内换热器的管内自清洁控制方法的优选技术方案中，“退出所述管内自清洁模式”的步骤进一步包括：
控制所述空调器恢复至进入所述管内自清洁模式之前的模式运行；
控制所述压缩机保持所述自清洁频率运行；
控制所述节流装置打开至预设开度；
控制所述第二通断阀关闭。
在上述室内换热器的管内自清洁控制方法的优选技术方案中，所述管内自清洁控制方法还包括：
在控制所述节流装置打开至所述预设开度并持续第五设定时间后，控制所述节流装置恢复至进入所述管内自清洁模式之前的开度；并且/或者
在所述压缩机保持所述自清洁频率运行并持续第六设定时间后，控制所述压缩机恢复至进入所述管内自清洁模式之前的频率运行。
在上述室内换热器的管内自清洁控制方法的优选技术方案中，“退出所述管内自清洁模式”的步骤还包括：
控制所述室内风机开启，并控制室内机的导风板向上送风；
在控制所述导风板向上送风并持续第七设定时间后，控制所述室内风机和所述导风板恢复至进入所述管内自清洁模式之前的运行状态。
在上述室内换热器的管内自清洁控制方法的优选技术方案中，所述预设开度为所述节流装置的最大开度。
在上述室内换热器的管内自清洁控制方法的优选技术方案中，所述自清洁频率为室外环境温度对应的最高限值频率。
需要说明的是，在本申请的优选技术方案中，空调器包括通过冷媒管路依次连接的压缩机、四通阀、室外换热器、节流装置、室内换热器，空调器还包括回收管路、第一通断阀和第二通断阀，第一通断阀设置于节流装置与室内换热器之间的冷媒管路上，回收管路的一端设置于节流 装置与第一通断阀之间的冷媒管路上，回收管路的另一端与压缩机的吸气口连通，第二通断阀设置于回收管路上，管内自清洁控制方法包括：响应于接收到的对室外换热器进行管内自清洁的指令，进入管内自清洁模式；控制空调器制冷运行；控制第一通断阀、第二通断阀关闭、节流装置关闭到最小开度；控制压缩机调整至预设的自清洁频率；每隔第一间隔时间获取压缩机的排气温度、排气压力和/或吸气压力；基于获取到的排气温度、排气压力和/或吸气压力，判断开阀条件是否成立；在开阀条件成立时，控制空调器制热运行，并且控制第一通断阀和第二通断阀打开。
通过上述控制方式，本申请的控制方法能够实现对室内换热器的自清洁，解决室内换热器的管内脏堵问题。具体地，通过首先控制空调器制冷运行，并且控制第一通断阀、第二通断阀关闭，节流装置关闭到最小开度，使得压缩机中排出的冷媒积聚在室外换热器和压缩机中，从而实现对冷媒的回收，将冷媒存储于室外换热器和压缩机中，当基于压缩机的排气温度、排气压力和/或吸气压力判断开阀条件成立时控制空调器制热运行，并打开第一通断阀、第二通断阀，能够利用高温高压冷媒的快速流动对室内换热器的盘管内部进行有效冲洗，将盘管内壁上的油污冲刷掉并随冷媒一起由回收管路直接返回至压缩机内部，实现对室内换热器的自清洁。此外，通过设置回收管路，能够在自清洁过程中实现直接将油污带回压缩机中进行回收，减少高温冷媒的流动行程、减少冷媒的压降，提高自清洁效果，节约自清洁时间，保证用户体验。
附图说明
下面参照附图来描述本申请的室内换热器的管内自清洁控制方法。附图中：
图1为本申请的空调器在制冷模式下的系统图；
图2为本申请的空调器在制热模式下的系统图；
图3为本申请的室内换热器的管内自清洁控制方法的流程图；
图4为本申请的室内换热器的管内自清洁控制方法的一种可能的实施过程的逻辑图。
附图标记列表
1、压缩机；2、四通阀；3、室外换热器；4、节流装置；5、室内换热器；6、冷媒管路；7、回收管路；8、第一通断阀；9、第二通断阀；10、第三通断阀；11、储液器。
具体实施方式
下面参照附图来描述本申请的优选实施方式。本领域技术人员应当理解的是，这些实施方式仅仅用于解释本申请的技术原理，并非旨在限制本申请的保护范围。例如，尽管下文详细描述了本申请方法的详细步骤，但是，在不偏离本申请的基本原理的前提下，本领域技术人员可以对上述步骤进行组合、拆分及调换顺序，如此修改后的技术方案并没有改变本申请的基本构思，因此也落入本申请的保护范围之内。
需要说明的是，在本申请的描述中，术语“第一”、“第二”、“第三”、“第四”、“第五”、“第六”、“第七”仅用于描述目的，而不能理解为指示或暗示相对重要性。
还需要说明的是，在本申请的描述中，除非另有明确的规定和限定，术语“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域技术人员而言，可根据具体情况理解上述术语在本申请中的具体含义。
首先参照图1，对本申请的空调器的结构进行描述。其中，图1为本申请的空调器在制冷模式下的系统图。
如图1所示，在一种可能的实施方式中，空调器包括压缩机1、四通阀2、室外换热器3、节流装置4、室内换热器5和储液器11。压缩机1的排气口通过冷媒管路6与四通阀2的P接口连通，四通阀2的C接口通过冷媒管路6与室外换热器3的进口连通，室外换热器3的出口通过冷媒管路6与节流装置4的一端口连通，节流装置4的另一端口通过冷媒管路6与室内换热器5的进口连通，室内换热器5的出口通过冷媒管路6与四通阀2的E接口连通，四通阀2的S接口通过冷媒管路6与储液器11的进口连通，储液器11的出口通过管路与压缩机1的吸气口连通。节流装置4优选地为电子膨胀阀，储液器11内设置有过滤网，储液 器11能够起到贮藏冷媒、冷媒气液分离、油污过滤、消音和冷媒缓冲等作用。
空调器还包括第一通断阀8、第二通断阀9和回收管路7，第一通断阀8和第二通断阀9优选地均为电磁阀，第一通断阀8为常开阀，其设置在节流装置4与室内换热器5之间的冷媒管路6上，第二通断阀9为常闭阀，其设置在回收管路7上，回收管路7采用内壁光滑的铜管，该铜管的第一端设置在节流装置4与第一通断阀8之间的冷媒管路6上，铜管的第二端设置在四通阀2的S接口与储液器11的进口之间的冷媒管路6上。第一通断阀8、第二通断阀9均与空调器的控制器通信连接，以接收控制器下发的开启和关闭信号。当然，上述通断阀中的一个或多个也可以选择电子膨胀阀等电控阀替代。
以下本实施例的室内换热器的管内自清洁控制方法将结合上述空调器的结构进行描述，但本领域技术人员可以理解的是，空调器的具体结构组成并非一成不变，本领域技术人员可以对其进行调整，例如，在上述空调器的结构的基础上增加其他部件等。
下面结合图1至图3，对本申请的室内换热器的管内自清洁控制方法进行介绍。其中，图2为本申请的空调器在制热模式下的系统图；图3为本申请的室内换热器的管内自清洁控制方法的流程图。
如图2所示，为了解决如何实现室内换热器的管内自清洁的问题，本申请的室内换热器的管内自清洁控制方法包括：
S101、响应于接收到的对室内换热器进行管内自清洁的指令，进入管内自清洁模式。
一种可能的实施方式中，对室内换热器进行管内自清洁的指令可以由用户主动发出，如通过遥控器上的按键向空调器发送指令，或者通过与空调器通信连接的终端发送指令，其中终端可以为智能设备上安装的APP，APP直接或通过向云端向空调器发送指令。其中，智能设备包括但不限于手机、平板电脑、智能音箱、智能手表等，智能设备与空调器或云端通讯连接的方式包括但不限于wifi、蓝牙、红外、3G/4G/5G等。空调器在接收到对室内换热器进行管内自清洁的指令后，切换运行模式到管内自清洁模式，开始对室内换热器的盘管进行管内自清洁。其中，管 内自清洁模式可以为计算机程序，其预先存储于空调器中，当运行该模式时，空调器按照程序设定好的步骤对空调器各部件的运行进行控制。
当然，自清洁指令也可以在空调器达到某些进入条件时自动发出，如空调器的累计工作时长达到预设时长时发出对室内换热器进行管内自清洁的指令等，其中预设时长例如可以是20h-40h。
S103、控制空调器制冷运行。
一种可能的实施方式中，通过控制四通阀的通断电来控制空调器的制冷/制热之间的切换，例如，在四通阀断电时，空调器制冷运行，在四通阀上电时，空调器制热运行。本实施例中，在进入管内自清洁模式后，如果空调器正在运行制冷模式，则无需调整，控制空调器继续运行；如果空调器正在运行非制冷模式，则控制空调器切换至制冷模式运行。
S105、控制第一通断阀、第二通断阀关闭、节流装置关闭到最小开度。
一种可能的实施方式中，控制第一通断阀关闭，对节流装置与室内换热器之间的冷媒管路节流，控制第二通断阀关闭，对回收管路节流，控制电子膨胀阀关闭到最小开度，即开度为0的状态，此时电子膨胀阀实现完全节流，冷媒无法流过。参照图1，此时，室内换热器中的冷媒由压缩机排出并全部聚积在室外换热器和压缩机中，实现对室内换热器中的冷媒回收。
S107、控制压缩机调整至预设的自清洁频率。
一种可能的实施方式中，自清洁频率为预先通过试验确定的频率，该频率可以接近或达到压缩机的最高运行频率，当压缩机在较高频率运行时，其排气口排出的冷媒压力和温度均较高，因此能够使得压缩机排出的冷媒快速升温升压。较为优选地，自清洁频率为室外环境温度对应的最高限值频率。通常，压缩机的运行频率受室外环境温度影响，不能无限制地上升，否则容易出现压缩机高温保护停机的现象，对压缩机的寿命造成不良影响。因此，压缩机均设置有保护措施，在不同室外环境温度下，对应设置有最高限值频率，本申请的自清洁频率即为压缩机在当前室外环境温度下的最高限值频率，在该频率限值下，压缩机能够以最短的时间实现排气口冷媒的压力和温度的快速提高。其中，室外环境温度的获取方式为本领域常规手段，在此不再赘述。
需要说明的是，虽然本申请中未列举具体数值对自清洁频率进行说明，但这并不代表本申请的控制方法无法实施，在不同型号的空调器和不同环境条件下，自清洁频率可能存在不同，因此本领域技术人员可以基于具体应用场景对自清洁频率进行设定，只要该频率的设置能够使得压缩机能够以较短的时间实现排气口处冷媒的压力和温度的快速提高即可。
S109、每隔第一间隔时间获取压缩机的排气温度、排气压力和/或吸气压力。
一种可能的实施方式中，压缩机的排气温度可以通过在压缩机的排气口处设置温度传感器获取，排气压力可以通过在压缩机的排气口设置压力传感器获取，吸气压力可以通过在压缩机的吸气口设置压力传感器获取。第一间隔时间可以为1s-5s中的任意值，该值的选取与排气温度、排气压力、吸气压力的变化速度以及本申请要达到的控制精度相关。如果自清洁频率相对较大，排气温度、排气压力和吸气压力的变化速度较快，或者本申请需要达到较高的控制精度，则第一间隔时间可以选取1s、2s或更短时间，反之如果自清洁频率相对较小，排气温度、排气压力和吸气压力的变化速度较慢，或者本申请的控制方法无需达到很高的精度，则第一间隔时间可以选择4s、5s或更长时间。
本申请中，优选地选取第一间隔时间为1s，并且排气温度、排气压力和吸气压力均需获取。也就是说，在压缩机达到自清洁频率后，每隔1s同时获取压缩机的排气温度、排气压力和吸气压力。
当然，在其他非优选的实施方式中，也可以仅获取上述三个参数中的一个。此外，排气温度、排气压力、吸气压力的获取方式并非唯一，本领域技术人员可以对其进行调整，这种调整并未偏离本申请的原理，例如，可以通过在室外换热器的盘管上设置温度传感器和压力传感器等来获取排气温度和排气压力，在室内换热器的盘管上设置压力传感器来获取吸气压力等。
S111、基于获取到的排气温度、排气压力和/或吸气压力，判断开阀条件是否成立。
一种可能的实施方式中，开阀条件包括下列条件中的至少一个：(1)排气温度大于等于排气温度阈值且持续第一设定时间；(2)排气压力大 于等于排气压力阈值且持续第二设定时间；(3)吸气压力小于等于吸气压力阈值且持续第三设定时间。当排气温度大于等于排气温度阈值且持续第一设定时间时，证明此时压缩机排气口之后的冷媒已经达到相当高的温度。同理，当排气压力大于等于排气压力阈值且持续第二设定时间时，证明此时压缩机排气口之后的冷媒已经达到相当高的压力。当吸气压力小于等于吸气压力阈值且持续第三设定时间时，证明压缩机吸气口处的冷媒已经基本被抽空。
当然，本申请中，上述开阀条件仅仅为较优选的实施方式，在不偏离本申请原理的前提下，本领域技术人员可以对上述开阀条件进行调整，只要调整后的条件能够正确判断出压缩机后聚积的冷媒的状态即可。例如，开阀条件还可以只包括上述三个条件中的一个或两个；或者开阀条件可以仅包括对温度/压力的判断，而省略对持续时间的判断等。
S113、在开阀条件成立时，控制空调器制热运行，并且控制第一通断阀和第二通断阀打开。
在一种可能的实施方式中，在上述条件(1)-(3)任一成立时，控制空调器制热运行，且控制第一通断阀和第二通断阀打开。此时，如图2中箭头所示，回收至室外换热器和压缩机中的冷媒在压缩机的作用下以高温高压的形式排出，并快速流至室内换热器，利用高温高压冷媒的快速流动冲击、清洗室内换热器的盘管内壁上附着的油污，并将冲洗下来的油污通过回收管路直接回收到储液器中实现对油污过滤和对机油的回收，然后在压缩机的压缩下，再次经过排气口排出，实现冷媒的循环。
可以看出，通过先控制空调器制冷运行，控制第一通断阀和第二通断阀关闭、电子膨胀阀关闭到最小开度，使得压缩机中排出的冷媒积聚在室外换热器和压缩机中，从而实现对冷媒的回收。当基于压缩机的排气温度、排气压力和吸气压力判断开阀条件成立时打开第一通断阀和第二通断阀，冷媒的温度和压力短时间内迅速增大，能够利用高温高压冷媒的快速流动对室内换热器的盘管内部进行有效冲洗，将盘管内壁上的油污冲刷掉并随冷媒一起由回收管路直接返回至储液器内部，实现对室内换热器的自清洁。
此外，通过在空调器中设置回收管路，本申请能够在对室内换热器执行管内自清洁过程中，利用回收管路实现对冷冻机油的回收，实现高 温高压冷媒在对室内换热器进行冲刷后，无需再次经过室外换热器，而是直接将油污带回储液器中进行回收过滤，然后再次经压缩机压缩排出循环，减少了高温冷媒的流动行程、减少沿程压降，提高管内自清洁效果。通过储液器的设置，能够对回收的冷冻机油进行过滤，避免冷冻机油中的杂质继续参与冷媒循环。
参照图1，在一种可能的实施方式中，空调器还包括第三通断阀10，第三通断阀10优选地为电磁阀，第三通断阀10为常开阀，其设置在室内换热器5与四通阀2之间的冷媒管路6上，第三通断阀10与空调器的控制器通信连接，以接收控制器下发的开启和关闭信号。显然，第三通断阀10也可以选择电子膨胀阀等电控阀替代。
在设置有第三通断阀的基础上，管内自清洁控制方法还包括：在空调器制冷运行并持续预设延迟时间后，控制第三通断阀关闭；以及在开阀条件成立时，控制第三通断阀打开。
具体地，预设延迟时间可以为10s-1min中的任意值，本申请中为30s，在空调器制冷运行持续30s后，室内换热器中的冷媒基本上全部被回收至室外换热器和压缩机中，此时关闭第三通断阀，以防止冷媒回流，保证接下来压缩机快速升温升压达到开阀条件。在开阀条件成立后，打开第三通断阀，使得回收在室外换热器和压缩机中的冷媒能够迅速冲击室内换热器的盘管，对室内换热器进行自清洁。
在一种可能的实施方式中，管内自清洁控制方法还包括：在控制空调器制热运行的同时或之后，控制室内风机停止运行。具体地，在制热运行时，利用冷媒的高温高压对室内换热器进行冲刷，此时如果开启室内风机，会影响自清洁效果，因此，控制室内风机停止运行，以保证室内换热器的自清洁效果。此外，如果进入管内自清洁模式前，空调器运行制冷模式，那么此时关闭室内风机，可以避免出风温度过高，影响用户体验。
在一种可能的实施方式中，管内自清洁控制方法还包括：在控制空调器制热运行并持续第四设定时间后，退出管内自清洁模式。其中，第四设定时间可以为3min-10min中的任意值，本申请优选为5min。当制热运行的时间持续5min时，高温高压冷媒已经循环多次，足以产生较佳的管内自清洁效果，因此在通断阀打开5min时，退出管内自清洁模式。
具体地，退出管内自清洁模式的步骤进一步包括：控制空调器恢复进入管内自清洁模式之前的模式运行、控制压缩机保持自清洁频率运行、控制节流装置打开至预设开度、控制第二通断阀关闭。在管内自清洁过程执行完毕后，空调器需要恢复到管内自清洁之前的运行模式，以继续调节室内温度。仍以进入管内清洁模式之前空调器制冷运行为例，在执行完管内自清洁模式后，需要切换回制冷模式运行。此时，控制四通阀断电恢复制冷模式，控制压缩机保持自清洁频率运行，控制电子膨胀阀打开至预设开度、并控第二制通断阀关闭，使得冷媒以正常制冷模式的流向流动。其中，预设开度为节流装置的最大开度，由于管内自清洁模式运行时绝大多数冷媒在压缩机和室内换热器之间循环，导致室外换热器中冷媒缺失，因此将节流装置调整至最大开度，使得冷媒迅速充满室外换热器，以尽快实现冷媒的正常循环。压缩机仍以自清洁频率即最高限值频率运行，能够提高冷媒的循环速度，快速降低室内换热器的盘管温度。
相应地，在控制节流装置打开至预设开度并持续第五设定时间后，控制节流装置恢复至进入管内自清洁模式之前的开度。其中，第五设定时间可以为1min-5min内的任意值，本申请优选为3min，当电子膨胀阀以最大开度运行3min后，冷媒循环已经趋于稳定，此时控制电子膨胀阀恢复至进入管内自清洁模式之前的开度，从而使电子膨胀阀完全恢复进入管内自清洁之前的制冷参数继续运行。
相应地，在控制压缩机保持自清洁频率运行并持续第六设定时间后，控制压缩机恢复至进入管内自清洁模式之前的频率运行。其中，第六设定时间可以为1min-5min内的任意值，本申请优选仍为3min，当压缩机以最高限值频率运行3min后，室内换热器的盘管温度已经快速降低，此时控制压缩机恢复至进入管内自清洁模式之前的频率，从而使空调器完全恢复进入管内自清洁之前的制冷参数继续运行。
当然，退出管内自清洁模式的方式并非只限于上述一种，在能够使空调器恢复至进入管内自清洁模式之前的运行状态的前提下，本领域技术人员可以自由选择具体的控制方式，这种选择并未偏离本申请的原理。例如，可以直接控制所有的部件恢复至进入管内自清洁模式之前的运行状态，也可以先控制某一个或几个部件先恢复至进入管内自清洁模式之 前的运行状态，再逐渐使所有部件恢复至进入管内自清洁模式之前的运行状态。
下面参照图4，对本申请的一种可能的实施过程进行描述。其中，图4为本申请的室内换热器的管内自清洁控制方法的一种可能的实施过程的逻辑图。
如图4所示，在一种可能的实施过程中，空调器制冷运行时，用户通过遥控器按键向空调器发送对室内换热器进行管内自清洁的指令：
首先执行步骤S201，空调器进入管内自清洁模式，即控制空调器制冷运行、第一通断阀和第二通断阀关闭、电子膨胀阀关闭至最小开度、压缩机在运行30s后控制第三通断阀关闭，实现对室内冷媒的回收。
接下来执行步骤S203，控制压缩机升频至室外环境温度对应的最高限值频率。
接下来执行步骤S205，获取压缩机的排气温度Td、排气压力Pd和吸气压力Ps。
接下来执行步骤S207，判断Td≥T、Pd≥P1和Ps≤P2中是否至少一个成立，其中T为排气温度阈值，P1为排气压力阈值，P2为吸气压力阈值。当判断结果为至少一个成立时，执行步骤S209，否则，当三个判断条件均不成立时，返回执行步骤S205。
S209，控制空调器制热运行、室内风机停止运行、第一通断阀、第二通断阀和第三通断阀打开。
接下来执行步骤S211，判断制热运行的持续时间t1≥5min是否成立；如果判断结果为成立，则执行步骤S213，否则，当判断结果不成立，则返回继续执行步骤S211。
S213，退出管内自清洁模式，具体地，控制空调器运行制冷模式、电子膨胀阀打开至最大开度、压缩机保持自清洁频率、室内风机开启且导风板向上送风、控制第二通断阀关闭。
接下来执行步骤S215，判断室内风机开启的时间t2≥30s是否成立；在判断结果成立时，执行步骤S217，否则，返回继续执行步骤S215；
S217，控制室内风机和导风板恢复进入管内自清洁模式之前的运行状态。
接下来运行步骤S219，判断运行制冷模式的持续时间t3≥3min是否成立；在判断结果为成立时，执行步骤S221；否则，在判断结果为不成立时，返回继续执行步骤S219。
S221，控制电子膨胀阀恢复至进入管内自清洁模式前的开度，考虑过内置压缩机恢复至进入管内自清洁之前的频率运行。至此空调器恢复至进入管内自清洁模式前的制冷模式运行。
本领域技术人员可以理解，上述充空调器还包括一些其他公知结构，例如处理器、控制器、存储器等，其中，存储器包括但不限于随机存储器、闪存、只读存储器、可编程只读存储器、易失性存储器、非易失性存储器、串行存储器、并行存储器或寄存器等，处理器包括但不限于CPLD/FPGA、DSP、ARM处理器、MIPS处理器等。为了不必要地模糊本公开的实施例，这些公知的结构未在附图中示出。
上述实施例中虽然将各个步骤按照上述先后次序的方式进行了描述，但是本领域技术人员可以理解，为了实现本实施例的效果，不同的步骤之间不必按照这样的次序执行，其可以同时(并行)执行或以颠倒的次序执行，这些简单的变化都在本申请的保护范围之内。例如，虽然上述步骤S207中是结合同时判断Td≥T、Pd≥P1和Ps≤P2三个条件进行描述的，但是本领域技术人员可以理解，上述三个条件也可以先后判断。
需要说明的是，虽然上述实施例是结合进入管内自清洁模式前空调器运行制冷模式进行介绍的，但是这并非旨在于限制本申请的保护范围，在空调器运行其他模式时，如果接收到进入管内自清洁模式的指令，则控制四通阀进行相应的通断电切换即可。例如，在空调运行制热模式的前提下，当接收到进入管内自清洁模式的指令时，则先控制四通阀断电切换为制冷运行。
至此，已经结合附图所示的优选实施方式描述了本申请的技术方案，但是，本领域技术人员容易理解的是，本申请的保护范围显然不局限于这些具体实施方式。在不偏离本申请的原理的前提下，本领域技术人员可以对相关技术特征作出等同的更改或替换，这些更改或替换之后的技术方案都将落入本申请的保护范围之内。

Claims (10)

  1. 一种室内换热器的管内自清洁控制方法，应用于空调器，其特征在于，所述空调器包括通过冷媒管路依次连接的压缩机、四通阀、室外换热器、节流装置、室内换热器，所述空调器还包括回收管路、第一通断阀和第二通断阀，所述第一通断阀设置于所述节流装置与所述室内换热器之间的冷媒管路上，所述回收管路的一端设置于所述节流装置与所述第一通断阀之间的冷媒管路上，所述回收管路的另一端与所述压缩机的吸气口连通，所述第二通断阀设置于所述回收管路上，
    所述管内自清洁控制方法包括：
    响应于接收到的对所述室内换热器进行管内自清洁的指令，进入管内自清洁模式；
    控制所述空调器制冷运行；
    控制所述第一通断阀、所述第二通断阀关闭、所述节流装置关闭到最小开度；
    控制所述压缩机调整至预设的自清洁频率；
    每隔第一间隔时间获取所述压缩机的排气温度、排气压力和/或吸气压力；
    基于获取到的所述排气温度、所述排气压力和/或所述吸气压力，判断开阀条件是否成立；
    在所述开阀条件成立时，控制所述空调器制热运行，并且控制所述第一通断阀和所述第二通断阀打开。
  2. 根据权利要求1所述的室内换热器的管内自清洁控制方法，其特征在于，所述空调器还包括第三通断阀，所述第三通断阀设置于所述室内换热器与所述四通阀之间的冷媒管路上，所述管内自清洁控制方法还包括：
    在所述空调器制冷运行并持续预设延迟时间后，控制所述第三通断阀关闭；以及
    在所述开阀条件成立时，控制所述第三通断阀打开。
  3. 根据权利要求1所述的室内换热器的管内自清洁控制方法，其特征在于，所述开阀条件包括下列条件中的至少一个：
    所述排气温度大于等于排气温度阈值且持续第一设定时间；
    所述排气压力大于等于排气压力阈值且持续第二设定时间；
    所述吸气压力小于等于吸气压力阈值且持续第三设定时间。
  4. 根据权利要求1所述的室内换热器的管内自清洁控制方法，其特征在于，所述管内自清洁控制方法还包括：
    在控制所述空调器制热运行的同时或之后，控制室内风机停止运行。
  5. 根据权利要求4所述的室内换热器的管内自清洁控制方法，其特征在于，所述管内自清洁控制方法还包括：
    在控制所述空调器制热运行并持续第四设定时间后，退出所述管内自清洁模式。
  6. 根据权利要求5所述的室内换热器的管内自清洁控制方法，其特征在于，“退出所述管内自清洁模式”的步骤进一步包括：
    控制所述空调器恢复至进入所述管内自清洁模式之前的模式运行；
    控制所述压缩机保持所述自清洁频率运行；
    控制所述节流装置打开至预设开度；
    控制所述第二通断阀关闭。
  7. 根据权利要求6所述的室内换热器的管内自清洁控制方法，其特征在于，所述管内自清洁控制方法还包括：
    在控制所述节流装置打开至所述预设开度并持续第五设定时间后，控制所述节流装置恢复至进入所述管内自清洁模式之前的开度；并且/或者
    在所述压缩机保持所述自清洁频率运行并持续第六设定时间后，控制所述压缩机恢复至进入所述管内自清洁模式之前的频率运行。
  8. 根据权利要求6所述的室内换热器的管内自清洁控制方法，其特征 在于，“退出所述管内自清洁模式”的步骤还包括：
    控制所述室内风机开启，并控制室内机的导风板向上送风；
    在控制所述导风板向上送风并持续第七设定时间后，控制所述室内风机和所述导风板恢复至进入所述管内自清洁模式之前的运行状态。
  9. 根据权利要求6所述的室内换热器的管内自清洁控制方法，其特征在于，所述预设开度为所述节流装置的最大开度。
  10. 根据权利要求1所述的室内换热器的管内自清洁控制方法，其特征在于，所述自清洁频率为室外环境温度对应的最高限值频率。
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