WO2023279615A1 - 室内机的管内油污回收方法 - Google Patents

室内机的管内油污回收方法 Download PDF

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Publication number
WO2023279615A1
WO2023279615A1 PCT/CN2021/129818 CN2021129818W WO2023279615A1 WO 2023279615 A1 WO2023279615 A1 WO 2023279615A1 CN 2021129818 W CN2021129818 W CN 2021129818W WO 2023279615 A1 WO2023279615 A1 WO 2023279615A1
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WIPO (PCT)
Prior art keywords
recovery
indoor
oil
preset
indoor unit
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PCT/CN2021/129818
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English (en)
French (fr)
Inventor
罗荣邦
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 WO2023279615A1 publication Critical patent/WO2023279615A1/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
    • 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
    • F24F11/86—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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the invention relates to the technical field of self-cleaning of air conditioners, in particular to a method for recovering oil stains in pipes of indoor units.
  • the refrigeration oil will participate in the circulation along with the refrigerant during use.
  • the refrigeration oil will appear carbon and impurities.
  • These oils will flow to the hairpin tube of the indoor heat exchanger along with the refrigerant. Due to the current
  • the hairpin tube is an internally threaded copper tube, which affects the flow of refrigeration oil. Coupled with the centrifugal force of the refrigerant flow, the oil and oil cannot return to the inside of the compressor in time, and stay on the inner wall of the threaded copper tube, hindering the connection between the refrigerant and the coil. The heat transfer between them reduces the heat transfer temperature difference and makes the air conditioning refrigeration effect worse.
  • the application provides a method for recovering oil pollution in the pipe of the indoor unit, which is applied to an air conditioner, and the air conditioner includes A compressor, a four-way valve, an outdoor heat exchanger, a throttling device, and an indoor heat exchanger are connected through a refrigerant pipeline.
  • the air conditioner also includes a recovery pipeline, and one end of the recovery pipeline exchanges heat with the outdoor
  • the outlet of the device is connected, the other end of the recovery pipeline is connected with the suction port of the compressor, and an on-off valve is arranged on the recovery pipeline, and the on-off valve is a normally closed valve.
  • the methods include:
  • the preset temperature is greater than the freezing temperature of the refrigerating machine oil.
  • the method further includes:
  • the second recovery frequency is the highest limit frequency corresponding to the outdoor ambient temperature.
  • the method further includes:
  • the preset opening is the maximum opening of the throttling device.
  • the method further includes:
  • the fan in the control room stops running.
  • the method also includes:
  • the indoor anti-freezing protection function and the outdoor ambient temperature frequency limiting function are turned off.
  • the method further includes:
  • the indoor unit tube oil recovery mode is exited.
  • the step of "exiting the oil pollution recovery mode in the pipe of the indoor unit" further includes:
  • the step of "exiting the mode of recovering oil in pipes of indoor units” also includes:
  • the indoor fan and the air deflector are controlled to return to the operating state before entering the oil pollution recovery mode in the indoor unit pipe.
  • the air conditioner includes a compressor connected through a refrigerant pipeline, a four-way valve, an outdoor heat exchanger, a throttling device, and an indoor heat exchanger, and the air conditioner also includes a recovery pipe One end of the recovery pipeline is connected to the outlet of the outdoor heat exchanger, and the other end of the recovery pipeline is connected to the suction port of the compressor.
  • An on-off valve is set on the recovery pipeline, and the on-off valve is a normally closed valve.
  • the method includes : Responding to the received instruction of recovering the oil pollution in the pipe of the indoor unit, enter the oil pollution recovery mode in the indoor unit pipe; control the air conditioner to run in the cooling mode; control the compressor to adjust to the preset first recovery frequency; adjust the opening of the throttling device degrees, so that the coil temperature of the indoor heat exchanger is less than or equal to the preset temperature; when the coil temperature is less than or equal to the preset temperature and lasts for the first preset time, control the air conditioner to switch to heating mode; control the on-off valve to open .
  • the throttling device is opened to a preset opening degree; wherein, the preset temperature is greater than the freezing temperature of the refrigerating machine oil.
  • the method of the present application can realize the recovery of oil pollution in the pipe of the indoor unit, and solve the problem of dirty blockage in the pipe of the indoor heat exchanger. Specifically, by controlling the air conditioner to run in cooling mode first, and adjusting the opening of the throttling device so that the coil temperature of the indoor heat exchanger is less than or equal to the preset temperature, due to the high viscosity of the refrigerator oil and oil, the freezing point is higher than that of the refrigerant.
  • the freezing point of the refrigeration oil is higher than that of the oil, so the oil in the refrigeration oil is first solidified and peeled off from the refrigerant cycle during the temperature drop of the refrigerant, and adheres to the inner wall of the coil of the indoor heat exchanger.
  • the engine oil is circulated back to the compressor along with the refrigerant, so that the oil in the refrigerant is separated and temporarily stored in the coil of the indoor heat exchanger.
  • the heat exchanger of the air conditioner is controlled to switch to the heating mode, and the on-off valve and the throttling device are opened, so that the rapid flow of high-temperature and high-pressure refrigerant can impact the indoor heat exchanger.
  • the oil stain temporarily stored inside the coil is melted by high temperature and returns directly to the interior of the compressor along with the refrigerant through the recovery pipeline to realize the oil recovery of the indoor heat exchanger.
  • the recovery pipeline it is possible to directly bring the oil back to the compressor for recovery during the oil recovery process, reduce the flow stroke of the high-temperature refrigerant, reduce the pressure drop of the refrigerant, improve the oil recovery effect, save the oil recovery time, and ensure 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 oil pollution recovery method in the pipe of the indoor unit of the present application.
  • Fig. 4 is a logic diagram of a possible implementation process of the method for recovering oil stains in pipes of indoor units of the present application.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • FIG. 1 is a system diagram of the air conditioner of the present application in cooling mode.
  • the air conditioner includes a compressor 1 , a four-way valve 2 , an outdoor heat exchanger 3 , a throttling device 4 , an indoor heat exchanger 5 and a liquid accumulator 9 .
  • the exhaust port of compressor 1 communicates with the P interface of four-way valve 2 through refrigerant pipeline 6, and the C interface of four-way valve 2 communicates with the inlet of outdoor heat exchanger 3 through refrigerant pipeline 6.
  • the outlet communicates with one port of the throttling device 4 through the refrigerant pipeline 6, and the other port of the throttling device 4 communicates with the inlet of the indoor heat exchanger 5 through the refrigerant pipeline 6, and the outlet of the indoor heat exchanger 5 passes through the refrigerant pipeline 6 is connected with the E port of the four-way valve 2, the S port of the four-way valve 2 is connected with the inlet of the accumulator 9 through the refrigerant pipeline 6, and the outlet of the accumulator 9 is connected with the suction port of the compressor 1 through the pipeline .
  • the throttling device 4 is preferably an electronic expansion valve, and a filter is provided in the liquid storage 9, and the liquid storage 9 can store refrigerant, separate gas and liquid of refrigerant, filter oil, eliminate noise, and buffer refrigerant.
  • the air conditioner also includes a recovery pipeline 7 and an on-off valve 8.
  • the recovery pipeline 7 adopts a copper tube with a smooth inner wall.
  • the on-off valve 8 is preferably a solenoid valve.
  • the solenoid valve is a normally closed valve and is arranged on the recovery pipeline 7.
  • the solenoid valve communicates with the controller of the air conditioner to receive the opening and closing signals issued by the controller.
  • the on-off valve 8 can also be an electronically controlled valve such as an electronic expansion valve.
  • the coil of the indoor heat exchanger 5 of the present application is further provided with a temperature sensor 10 , and the temperature sensor 10 is used to detect the temperature of the coil of the indoor heat exchanger 5 .
  • the principle of detecting the coil temperature of the heat exchanger by the temperature sensor 10 is common knowledge in the art, and will not be repeated here.
  • 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 method for recovering oil in pipes of the indoor unit of the present application.
  • the oil pollution recovery method in the indoor unit of the present application includes:
  • the instruction to recover the oil pollution in the pipe of the indoor unit can be actively issued by the user, such as sending an instruction to the air conditioner through a button on the remote control, or sending an instruction through a terminal connected to the air conditioner in communication, wherein the terminal It can be the APP installed on the smart device, and the APP can send 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 the instruction to recover the oil in the pipe of the indoor unit, it switches the operation mode to the oil recovery mode in the indoor unit pipe, and starts to recover the oil in the pipe of the coil of the indoor unit.
  • the oil pollution recovery mode in the pipe can be a computer program, which is pre-stored in the air conditioner. When this mode is operated, the air conditioner controls the operation of each component of the air conditioner according to the steps set by the program.
  • the oil pollution recovery command in the indoor unit pipe can also be automatically issued when the air conditioner meets certain entry conditions.
  • the cumulative working time of the air conditioner reaches the preset time
  • an instruction to recover the oil pollution in the indoor unit pipe is issued, and the preset time length For example, it can be 20h-40h.
  • the switching between the operating modes 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 conditioner runs in cooling mode, When powered on, the air conditioner operates in heating mode. In this embodiment, after entering the oil pollution recovery mode in the indoor unit 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 run.
  • the first recovery 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 recovery frequency in Table 1 below.
  • the compressor operates at the first recovery frequency, it facilitates the implementation of the subsequent control process.
  • the temperature sensor detects the coil temperature of the indoor heat exchanger, and dynamically adjusts the opening of the electronic expansion valve so that the coil temperature of the indoor heat exchanger is less than or equal to a preset temperature.
  • the preset temperature is higher than the freezing temperature of the refrigerator oil, so, since the freezing points of the refrigerator oil and the refrigerant are far lower than the freezing point of the oil, the preset temperature is set to be higher than the freezing temperature of the refrigerator oil, and the coil temperature can be lower than When the temperature is equal to the preset temperature, the oil will be solidified and precipitated first, while the refrigeration oil and refrigerant will circulate normally.
  • the specific value of the preset temperature is determined based on the type of refrigerating machine oil used. For example, to ensure fluidity, the freezing point of refrigerating machine oil is below -50°C.
  • the preset temperature can be set from -5°C to -25°C, and in this application, the preset temperature can be -10°C. That is to say, the coil temperature of the indoor heat exchanger is less than or equal to the preset temperature as the control purpose, and the coil temperature of the indoor heat exchanger is always less than or equal to The status of the preset temperature.
  • the coil temperature of the indoor heat exchanger can also be lower than or equal to the preset temperature by adjusting the opening degree of the electronic expansion valve to a fixed opening degree.
  • 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 throttling device and the on-off valve are controlled to open.
  • the high-temperature and high-pressure refrigerant discharged from the compressor flows through the indoor heat exchanger, and the high-temperature and high-pressure refrigerant quickly impacts the coil of the indoor heat exchanger, and the oil that is temporarily stored in the coil is melted.
  • the high-temperature refrigerant directly flows back to the accumulator through the recovery pipeline, and is intercepted and filtered by the filter inside the accumulator to achieve the purpose of oil recovery.
  • the throttling device is controlled to open to the maximum opening degree, so that the high-temperature and high-pressure refrigerant can pass quickly, reduce the pressure drop during the flow of the refrigerant, and improve the oil recovery effect in the pipe.
  • the freezing point is higher than that of the refrigerant.
  • the freezing point of refrigerating machine oil is higher than that of oil, so the oil in refrigerating machine oil first solidifies and peels off from the refrigerant cycle when the temperature of the refrigerant drops, and adheres to the inner wall of the coil of the indoor heat exchanger.
  • Refrigerator oil is circulated back to the compressor along with the refrigerant, so that the oil in the refrigerant is separated and temporarily stored inside the coil of the indoor heat exchanger.
  • the heat exchanger of the air conditioner is controlled to switch to the heating mode, and the on-off valve and the throttling device are opened, so that the rapid flow of high-temperature and high-pressure refrigerant can impact the indoor heat exchanger.
  • the oil stain temporarily stored inside the coil is melted by high temperature and returns directly to the interior of the liquid receiver through the recovery pipeline along with the refrigerant to realize the oil recovery of the indoor heat exchanger.
  • the application can use the recovery pipeline to realize the recovery of oil pollution in the process of recovering the oil pollution in the pipe of the indoor heat exchanger, and realize the flushing of the indoor heat exchanger by the high-temperature and high-pressure refrigerant.
  • the oil is directly brought back to the liquid receiver for recovery and filtration, and then compressed and discharged by the compressor again, which reduces the flow stroke of the high-temperature refrigerant, reduces the pressure drop along the way, and improves the internal pressure of the pipe. Oil recovery effect.
  • the method further includes: controlling the compressor to adjust to a preset second recovery frequency.
  • the second recovery frequency is preferably 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 highest limit frequency is correspondingly set.
  • the second recovery frequency of this application is the highest limit frequency of the compressor at the current outdoor ambient temperature. Under the frequency limit, the compressor can increase the temperature and pressure of the refrigerant in the shortest time, thereby improving the oil recovery effect.
  • the manner of obtaining the outdoor ambient temperature is a conventional means in the field, and will not be repeated here.
  • the method before the step of "adjusting the opening degree of the throttling device", the method further includes: controlling the outdoor fan to run at the highest speed. Specifically, before adjusting the opening degree of the throttling device, by controlling the outdoor fan to run at the highest speed, the heat exchange effect between the refrigerant and the environment in the outdoor heat exchanger can be improved, thereby reducing the temperature and pressure of the refrigerant, and improving the temperature of the refrigerant.
  • the evaporation effect in the indoor heat exchanger causes the indoor coil to cool down to the preset temperature more quickly.
  • the method before the step of "adjusting the opening degree of the throttling device", the method further includes: controlling the indoor fan to stop running. Specifically, before adjusting the opening degree of the throttling device, the indoor fan is first controlled to stop running, so as to reduce the heat exchange effect between the indoor heat exchanger and the air, thereby speeding up the temperature reduction of the indoor coil and reducing the oil pollution. recycling efficiency.
  • the method further includes: when entering the oil pollution recovery mode in the pipe of the indoor unit, turning off the indoor anti-freezing 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. But other protection functions are turned on as usual, such as compressor exhaust protection and current overload protection, and other functions remain turned on to prevent adverse effects on the life of the air conditioner.
  • the specific control process of the oil pollution recovery mode in the indoor unit pipe is not unique.
  • those skilled in the art can adjust the control method.
  • the coil temperature of the indoor heat exchanger can be kept below or equal to the preset temperature
  • the operation frequency of the compressor, the opening degree of the electronic expansion valve, the speed of the indoor fan and the outdoor fan can be controlled in the above control mode.
  • One or more of the rotational speeds are omitted.
  • the speed of the outdoor fan can be determined according to the outdoor ambient temperature, and then the operation of the outdoor fan can be controlled.
  • the method further includes: after the on-off valve is opened and the throttling device is opened to a preset opening for a second preset period of time, exiting the indoor unit pipe oil recovery mode.
  • the second preset time length can be any value in 3min-10min, preferably 5min in this application.
  • the step of exiting the oil pollution recovery mode in the indoor unit pipe further includes: controlling the air conditioner to return to the operating mode before entering the oil pollution recovery mode in the indoor unit pipe, controlling the compressor to return to the frequency before entering the oil pollution recovery mode in the indoor unit pipe, controlling the indoor The fan is turned on, and the air deflector of the indoor unit is controlled to send air upward, the throttling device is controlled to maintain the maximum opening, and the on-off valve is controlled to be closed.
  • the air conditioner needs to return to the operation mode before the oil pollution recovery in the pipe, so as to continue to adjust the indoor temperature. Take the air conditioner running in the cooling mode before entering the oil pollution recovery mode in the indoor unit pipe as an example.
  • control the four-way valve to turn off the power to restore the cooling mode control the compressor to recover from the second recovery frequency to the frequency before entering the oil pollution recovery mode in the indoor unit pipe, control the indoor fan to turn on and the air deflector of the indoor unit to send air upwards, and control The electronic 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. Since the refrigerant circulates between the compressor and the indoor heat exchanger during the operation of the oil pollution recovery mode in the indoor unit pipe, resulting in the lack of refrigerant in the outdoor heat exchanger, the throttling device maintains the maximum opening degree. Make the refrigerant quickly fill the outdoor heat exchanger, so as to realize the normal circulation of the refrigerant as soon as possible.
  • the indoor fan and the air deflector are controlled to return to the operating state before entering the oil pollution recovery mode in the indoor unit pipe.
  • the third preset duration can be any value from 20s to 1min. In this application, it is preferably 30s.
  • the indoor fan is turned on and the air guide plate blows air upwards for 30s, the temperature of the coil of the indoor heat exchanger has dropped to the level comparable to that of the cooling system.
  • the indoor fan and the air deflector are controlled to return to the operating mode before entering the oil pollution recovery mode in the indoor unit pipe, so as to meet the cooling needs of the user.
  • the throttling device is controlled to maintain the maximum opening for a fourth preset period of time
  • the throttling device is controlled to return to the opening before entering the oil pollution recovery mode in the indoor unit pipe.
  • the fourth preset time length can be any value within 1min-5min, preferably 3min in this application, when the electronic expansion valve maintains the maximum opening and runs for 3min, the refrigerant circulation has tended to be stable, at this time the electronic expansion valve is controlled to return to The opening degree before entering the oil pollution recovery mode in the indoor unit pipe, so that the air conditioner can completely restore the cooling parameters before entering the indoor unit pipe oil recovery mode and continue to operate.
  • the way to exit the oil pollution recovery mode in the indoor unit pipe is not limited to the above-mentioned one.
  • the air conditioner can be restored to the operating state before entering the oil pollution recovery mode in the indoor unit pipe
  • those skilled in the art can freely choose specific control methods. way, 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 oil pollution recovery mode in the indoor unit pipe; for another example, after the temperature of the coil tube of the indoor heat exchanger has dropped to a temperature suitable for the cooling mode, the indoor fan can be controlled again. The fan starts running.
  • FIG. 4 is a logic diagram of a possible implementation process of the method for recovering oil pollution in pipes of indoor units of the present application.
  • step S201 is executed, the air conditioner enters the oil pollution recovery mode in the indoor unit pipe, that is, the air conditioner is controlled to maintain the cooling mode operation, the compressor is controlled to adjust to the first recovery frequency, the indoor fan is controlled to stop running, and the outdoor fan is controlled to run at the maximum speed.
  • step S203 is executed to adjust the opening degree of the throttling device and obtain the coil temperature Tp of the indoor heat exchanger.
  • step S205 is executed to judge whether the coil temperature Tp of the indoor heat exchanger Tp ⁇ -10°C and the duration t1 ⁇ 10min are simultaneously established, and if both conditions are established, execute step S207, otherwise, when the two conditions are not simultaneously established, return Execute step S203.
  • control the air conditioner to operate in the heating mode control the compressor to adjust to the highest limit frequency corresponding to the outdoor ambient temperature, control the solenoid valve to open, and the electronic expansion valve to open to the maximum opening.
  • step S209 is executed, and it is judged whether the duration t2 ⁇ 5min of the electronic expansion valve and the electromagnetic valve being jointly opened is established; if the judgment result is true, then step S211 is executed; otherwise, when the judgment result is not established, then return to continue execution of step S209.
  • S211 exit the oil pollution recovery mode in the pipe, specifically, control the air conditioner to operate in the cooling mode, control the electronic expansion valve to maintain the maximum opening, control the indoor fan to turn on and the air deflector to blow upward, and control the compressor to return to the oil pollution recovery mode entering the indoor unit pipe Before the frequency, the control solenoid valve is closed.
  • step S213 is executed to judge whether the time t3 ⁇ 30s for the indoor fan to be turned on is established; when the judgment result is established, execute step S215, otherwise, return to continue executing step S213;
  • step S217 is executed to determine whether the duration of the electronic expansion valve maintaining the maximum opening degree t4 ⁇ 3min is established; if the judgment result is true, execute step S219; otherwise, if the judgment result is not established, return to continue to execute step S217.
  • 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

本发明涉及空调自清洁技术领域，具体涉及一种室内机的管内油污回收方法。本申请旨在解决如何实现室内机的管内油污回收的问题。为此目的，本申请的空调器还包括回收管路，其一端与室外换热器出口连通，另一端与压缩机吸气口连通，回收管路上设置有通断阀。方法包括：进入室内机管内油污回收模式；控制空调器运行制冷模式；控制压缩机调整至预设的第一回收频率；调节节流装置的开度，以使得室内换热器的盘管温度小于等于预设温度；当盘管温度小于等于预设温度且持续第一预设时长后，控制空调器转换为制热模式；控制通断阀打开、节流装置打开至预设开度。本申请的方法能够实现对室内机的管内油污回收，解决室内换热器的管内脏堵问题。

Description

室内机的管内油污回收方法 技术领域
本发明涉及空调自清洁技术领域，具体涉及一种室内机的管内油污回收方法。
背景技术
对于空调室内机来说，使用过程中冷冻机油会随着冷媒一同参与循环，在循环过程中，冷冻机油会出现结碳和杂质，这些油污伴随冷媒流动到室内换热器的发卡管，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，导致机油和油污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，使空调制冷制果变差。
相应地，本领域需要一种新的室内机的管内油污回收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机的管内油污回收的问题，本申请提供了一种室内机的管内油污回收方法，应用于空调器，所述空调器包括通过冷媒管路连接的压缩机、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，所述回收管路的一端与所述室外换热器的出口连通，所述回收管路的另一端与所述压缩机的吸气口连通，所述回收管路上设置有通断阀，所述通断阀为常闭阀，
所述方法包括：
响应于接收到的对所述室内机进行管内油污回收的指令，进入室内机管内油污回收模式；
控制所述空调器运行制冷模式；
控制所述压缩机调整至预设的第一回收频率；
调节所述节流装置的开度，以使得所述室内换热器的盘管温度小于等于预设温度；
当所述盘管温度小于等于所述预设温度且持续第一预设时长后，控制所述空调器转换为制热模式；
控制所述通断阀打开、所述节流装置打开至预设开度；
其中，所述预设温度大于冷冻机油的凝固温度。
在上述室内机的管内油污回收方法的优选技术方案中，在“控制所述空调器转换为制热模式”的步骤之后，所述方法还包括：
控制所述压缩机调整至预设的第二回收频率。
在上述室内机的管内油污回收方法的优选技术方案中，所述第二回收频率为室外环境温度对应的最高限值频率。
在上述室内机的管内油污回收方法的优选技术方案中，在“调节所述节流装置的开度”的步骤之前，所述方法还包括：
控制室外风机以最高转速运行。
在上述室内机的管内油污回收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。
在上述室内机的管内油污回收方法的优选技术方案中，在“调节所述节流装置的开度”的步骤之前，所述方法还包括：
控制室内风机停止运行。
在上述室内机的管内油污回收方法的优选技术方案中，所述方法还包括：
进入所述室内机管内油污回收模式时，关闭室内防冻结保护功能和室外环境温度限频功能。
在上述室内机的管内油污回收方法的优选技术方案中，在“控制所述通断阀打开、所述节流装置打开至预设开度”的步骤之后，所述方法还包括：
在所述通断阀打开、所述节流装置打开至预设开度的状态持续第二预设时长后，退出所述室内机管内油污回收模式。
在上述室内机的管内油污回收方法的优选技术方案中，“退出所述室内机管内油污回收模式”的步骤进一步包括：
控制所述空调器恢复至进入所述室内机管内油污回收模式之前的运 行模式；
控制所述压缩机恢复至进入所述室内机管内油污回收模式之前的频率；
控制所述通断阀关闭。
在上述室内机的管内油污回收方法的优选技术方案中，“退出所述室内机管内油污回收模式”的步骤还包括：
控制室内风机开启，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三预设时长后，控制所述室内风机和所述导风板恢复至进入所述室内机管内油污回收模式之前的运行状态。
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，回收管路的一端与室外换热器的出口连通，回收管路的另一端与压缩机的吸气口连通，回收管路上设置有通断阀，通断阀为常闭阀，方法包括：响应于接收到的对室内机进行管内油污回收的指令，进入室内机管内油污回收模式；控制空调器运行制冷模式；控制压缩机调整至预设的第一回收频率；调节节流装置的开度，以使得室内换热器的盘管温度小于等于预设温度；当盘管温度小于等于预设温度且持续第一预设时长后，控制空调器转换为制热模式；控制通断阀打开、节流装置打开至预设开度；其中，预设温度大于冷冻机油的凝固温度。
通过上述控制方式，本申请的方法能够实现对室内机的管内油污回收，解决室内换热器的管内脏堵问题。具体地，通过控制空调器先运行制冷模式，并调节节流装置的开度使得室内换热器的盘管温度小于等于预设温度，由于冷冻机油和油污的粘性很大，凝固点均比冷媒的要高，而冷冻机油相比油污凝固点要高，因此在冷媒温度下降过程中冷冻机油中的油污率先从冷媒循环中凝固剥离出来，附着在室内换热器的盘管内壁上，而正常的冷冻机油则随着冷媒循环回到压缩机，这样就把冷媒中的油污分离出来暂时储存在室内换热器的盘管内部。当盘管温度小于等于预设温度且持续第一预设时长之后，控制空调换热器转换为制热模式，并打开通断阀和节流装置，能够利用高温高压冷媒的快速流动冲击室内换热器的盘管内部，暂存于盘管内部的油污被高温融化掉并随冷媒一起 由回收管路直接返回至压缩机内部，实现对室内换热器的油污回收。此外，通过设置回收管路，能够在油污回收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，提高油污回收效果，节约油污回收时间，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机的管内油污回收方法。附图中：
图1为本申请的空调器在制冷模式下的***图；
图2为本申请的空调器在制热模式下的***图；
图3为本申请的室内机的管内油污回收方法的流程图；
图4为本申请的室内机的管内油污回收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、通断阀；9、储液器、10、温度传感器。
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”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***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9。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9的进口连通，储液器9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9内设置有过滤网，储液器9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。
空调器还包括回收管路7和通断阀8，回收管路7采用内壁光滑的铜管，该铜管的第一端设置在室外换热器3的出口与节流装置4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9的进口之间的冷媒管路6上。通断阀8优选地为电磁阀，电磁阀为常闭阀且设置在回收管路7上，该电磁阀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，通断阀8也可以选择电子膨胀阀等电控阀。
为实现下述方法，本申请的室内换热器5的盘管上还设置有温度传感器10，温度传感器10用于检测室内换热器5的盘管温度。通过温度传感器10检测换热器的盘管温度的原理本领域公知常识，在此不再赘述。
以下本实施例的室内机的管内油污回收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，可以在上述空调器的结构的基础上增加或删除部件等。
下面结合图1、图2和图3，对本申请的室内机的管内油污回收方法进行介绍。其中，图2为本申请的空调器在制热模式下的***图；图3为本申请的室内机的管内油污回收方法的流程图。
如图3所示，为了解决如何实现室内机的管内油污回收的问题，本申请的室内机的管内油污回收方法包括：
S101、响应于接收到的对室内机进行管内油污回收的指令，进入室内机管内油污回收模式。
一种可能的实施方式中，对室内机进行管内油污回收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机进行管内油污回收的指令后，切换运行模式到室内机管内油污回收模式，开始对室内机的盘管进行管内油污回收。其中，管内油污回收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，室内机管内油污回收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机进行管内油污回收的指令等，其中预设时长例如可以是20h-40h。
S103、控制空调器运行制冷模式。
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运行模式之间的切换，例如，在四通阀断电时，空调器运行制冷模式，在四通阀上电时，空调器运行制热模式。本实施例中，在进入室内机管内油污回收模式后，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、控制压缩机调整至预设的第一回收频率。
一种可能的实施方式中，第一回收频率为预先通过试验确定的频率，例如，可以基于如下表1中室外环境温度与第一回收频率之间的对应关系确定。当压缩机在第一回收频率运行时，其有利于后续控制过程的实施。
表1 室外环境温度与第一回收频率对照表
室外环境温度(℃) 第一回收频率(Hz)
Tao≤16 50
16＜Tao≤22 60
22＜Tao≤29 70
29＜Tao≤35 80
35＜Tao≤43 85
43＜Tao≤52 78
Tao＞52 72
S107、控制节流装置的开度，以使得室内换热器的盘管温度小于等于预设温度。
一种可能的实施方式中，通过温度传感器检测室内换热器的盘管温度，并动态调节电子膨胀阀的开度，使得室内换热器的盘管温度小于等于预设温度。优选地，预设温度大于冷冻机油的凝固温度，如此，由于冷冻机油和冷媒的凝固点均远低于油污的凝固点，因此将预设温度设置为大于冷冻机油的凝固温度，可以在盘管温度小于等于预设温度时，首先令油污凝固析出，而冷冻机油和冷媒则正常循环。对于不同型号的冷冻机油来说，其凝固点不同，因此预设温度的具体数值基于所用的冷冻机油型号确定，例如，通常为保证流动性，冷冻机油的凝固点都在-50℃以下，因此本申请的预设温度可以设置为-5℃至-25℃，本申请中，预设温度可以为-10℃。也就是说，将室内换热器的盘管温度小于等于预设温度作为控制目的，通过调节电子膨胀阀的开度(如PID调节等)，使得室内换热器的盘管温度始终处于小于等于预设温度的状态。
参照图1，在空调器运行制冷模式时，将室内换热器的盘管温度保持在小于等于-10℃的状态，此时室内换热器中的油污就从冷媒循环中剥离出来，附着在室内换热器的盘管内壁上。
当然，在其他实施方式中，也可以通过调整电子膨胀阀的开度至一固定开度的方式使室内换热器的盘管温度小于等于预设温度。
S109、当盘管温度小于等于预设温度且持续第一预设时长后，控制空调器转换为制热模式。
一种可能的实施方式中，第一预设时长可以为5-15min中的任意值。优选地，本实施例中第一预设时长为10min，当盘管温度处于小于等于-10℃且持续10min后，室内换热器中的油污已经剥离，此时可以对剥离出的油污进行回收操作。此时，通过控制四通阀的通断电来控制空调器的运行模式之间的切换，例如，控制四通阀上电，空调器运行制热模式。
S111、控制通断阀打开、节流装置打开至预设开度。
在一种可能的实施方式中，当运行模式切换为制热模式后，控制节流装置和通断阀打开。此时，如图2中箭头所示，压缩机排出的高温高压冷媒流过室内换热器，高温高压冷媒快速冲击室内换热器的盘管，暂存在盘管内部的油污被熔化，随着高温冷媒直接通过回收管路回流到储液器，被储液器内部的过滤网拦截过滤，达到油污回收的目的。较为优选地，控制节流装置打开至最大开度，如此一来，能够使高温高压冷媒迅速通过，减少冷媒流动过程中的压降，提高管内油污回收效果。
可以看出，通过控制空调器先运行制冷模式，并调节节流装置的开度使得室内换热器的盘管温度小于等于预设温度，由于冷冻机油和油污的粘性很大，凝固点均比冷媒的要高，而冷冻机油相比油污凝固点要高，因此在冷媒温度下降过程中冷冻机油中的油污率先从冷媒循环中凝固剥离出来，附着在室内换热器的盘管内壁上，而正常的冷冻机油则随着冷媒循环回到压缩机，这样就把冷媒中的油污分离出来暂时储存在室内换热器的盘管内部。当盘管温度小于等于预设温度且持续第一预设时长之后，控制空调换热器转换为制热模式，并打开通断阀和节流装置，能够利用高温高压冷媒的快速流动冲击室内换热器的盘管内部，暂存于盘管内部的油污被高温融化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油污回收。
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油污回收过程中，利用回收管路实现对油污的回收，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，提高管内油污回收效果。
一种可能的实施方式中，在“控制空调器转换为制热模式”的步骤之后，所述方法还包括：控制压缩机调整至预设的第二回收频率。其中，第二回收频率优选的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机制，在不同室外环境温度下，对应设置有最高限值频率，本申请的第二回收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提高冷媒的温度和压力，从而提高油污回收效果。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。
在一种可能的实施方式中，在“调节节流装置的开度”的步骤之前，方法还包括：控制室外风机以最高转速运行。具体地，在调节节流装置的开度之前，通过控制室外风机以最高转速运行，能够提高室外换热器中冷媒与环境之间的换热效果，从而降低冷媒的温度和压力，提高冷媒在室内换热器中蒸发效果，使室内盘管以更快的速度降低至预设温度。
在一种可能的实施方式中，在“调节节流装置的开度”的步骤之前，方法还包括：控制室内风机停止运行。具体地，在调节节流装置的开度之前，首先控制室内风机停止运行，以减小室内换热器与空气之间的换热效果，从而能够加快室内盘管的温度的降低速度，提升油污回收效率。
在一种可能的实施方式中，方法还包括：进入室内机管内油污回收模式时，关闭室内防冻结保护功能和室外环境温度限频功能。由于室内换热器的盘管温度需要降低至较低的值，因此为尽快达到该条件，需要压缩机高频运行，因此在制冷运行过程中，关闭室内防冻结保护功能和室外环境温度限频功能，以保证本方法的顺利执行。但是其他保护功能照常开启，如压缩机排气保护和电流过载保护等功能保持开启，防止对空调器的寿命带来不良影响。
当然，室内机管内油污回收模式的具体控制过程并非唯一，在保证先运行制冷模式使盘管温度小于等于预设温度，再转换为制热模式运行并打开通断阀和节流装置的前提下，本领域技术人员可以对其控制方式进行调整。例如，在能够使室内换热器的盘管温度保持在小于等于预设温度的前提下，可以对上述控制方式的压缩机的运行频率、电子膨胀阀 的开度、室内风机的转速和室外风机的转速中的一个或多个进行省略。再如，在执行管内油污回收模式时，可以按照室外环境温度确定室外风机的转速，然后控制室外风机运行。
在一种可能的实施方式中，方法还包括：在通断阀打开、节流装置打开至预设开度的状态持续第二预设时长后，退出室内机管内油污回收模式。其中，第二预设时长可以为3min-10min中的任意值，本申请优选为5min。当节流装置和通断阀打开的时间持续5min时，高温高压冷媒已经循环多次，足以产生较佳的管内油污回收效果，因此在节流装置和通断阀打开5min时，退出室内机管内油污回收模式。
具体地，退出室内机管内油污回收模式的步骤进一步包括：控制空调器恢复至进入室内机管内油污回收模式之前的运行模式、控制压缩机恢复至进入室内机管内油污回收模式之前的频率、控制室内风机开启，并控制室内机的导风板向上送风、控制节流装置保持最大开度、控制通断阀关闭。在管内油污回收过程执行完毕后，空调器需要恢复到管内油污回收之前的运行模式，以继续调节室内温度。以进入室内机管内油污回收模式之前空调器运行制冷模式为例，在执行完室内机管内油污回收模式后，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，控制压缩机由第二回收频率恢复至进入室内机管内油污回收模式之前的频率，控制室内风机开启且室内机的导风板向上送风，控制电子膨胀阀保持最大开度、并控制通断阀关闭，使得冷媒以正常制冷模式的流向流动。其中，室内风机开启的同时室内机的导风板向上送风，防止由于空调刚转换为制冷模式时，室内换热器盘管温度过高而出风给用户带来不好的使用体验。其中，节流装置保持最大开度，由于室内机管内油污回收模式运行时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，因此节流装置保持最大开度，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。
相应地，在控制导风板向上送风并持续第三预设时长后，控制室内风机和导风板恢复至进入室内机管内油污回收模式之前的运行状态。其中，第三预设时长可以为20s-1min中的任意值，本申请优选为30s，当室内风机开启且导风板向上送风30s后，室内换热器的盘管温度已经下降至 与制冷模式相匹配的温度，此时控制室内风机和导风板恢复至进入室内机管内油污回收模式之前的运行模式，以满足用户的制冷需求。
相应地，在控制节流装置保持最大开度并持续第四预设时长后，控制节流装置恢复至进入室内机管内油污回收模式之前的开度。其中，第四预设时长可以为1min-5min内的任意值，本申请优选为3min，当电子膨胀阀保持最大开度运行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室内机管内油污回收模式之前的开度，从而使空调器完全恢复进入室内机管内油污回收之前的制冷参数继续运行。
当然，退出室内机管内油污回收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室内机管内油污回收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，可以控制室外风机恢复到进入室内机管内油污回收模式之前的运行状态；再如，还可以在获取到室内换热器的盘管温度下降到与制冷模式相适应的温度之后，再控制室内风机启动运行。
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为本申请的室内机的管内油污回收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，空调器运行制冷模式时，用户通过遥控器按键向空调器发送对室内机进行管内油污回收的指令：
首先执行步骤S201，空调器进入室内机管内油污回收模式，即控制空调器保持制冷模式运行、控制压缩机调整至第一回收频率、控制室内风机停止运行、控制室外风机以最大转速运行。
接下来执行步骤S203，调节节流装置的开度，并获取室内换热器的盘管温度Tp。
接下来执行步骤S205，判断室内换热器的盘管温度Tp≤-10℃且持续时间t1≥10min是否同时成立，当同时成立时，执行步骤S207，否则，当两条件未同时成立时，返回执行步骤S203。
S207，控制空调运行制热模式、控制压缩机调整至室外环境温度对应的最高限值频率、控制电磁阀打开、电子膨胀阀打开至最大开度。
接下来执行步骤S209，判断电子膨胀阀和电磁阀共同打开的持续时间t2≥5min是否成立；如果判断结果为成立，则执行步骤S211，否则，当判断结果不成立，则返回继续执行步骤S209。
S211，退出管内油污回收模式，具体地，控制空调器运行制冷模式、控制电子膨胀阀保持最大开度、控制室内风机开启且导风板向上吹、控制压缩机恢复至进入室内机管内油污回收模式前的频率、控制电磁阀关闭。
接下来执行步骤S213，判断室内风机开启的时间t3≥30s是否成立；在判断结果成立时，执行步骤S215，否则，返回继续执行步骤S213；
S215，控制室内风机和导风板恢复进入室内机管内油污回收模式之前的运行状态。
接下来执行步骤S217，判断电子膨胀阀保持最大开度的持续时间t4≥3min是否成立；在判断结果为成立时，执行步骤S219；否则，在判断结果为不成立时，返回继续执行步骤S217。
S219，控制电子膨胀阀恢复至进入室内机管内油污回收模式前的开度，至此空调器恢复至进入室内机管内油污回收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。
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. 一种室内机的管内油污回收方法，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，所述回收管路的一端与所述室外换热器的出口连通，所述回收管路的另一端与所述压缩机的吸气口连通，所述回收管路上设置有通断阀，所述通断阀为常闭阀，
    所述方法包括：
    响应于接收到的对所述室内机进行管内油污回收的指令，进入室内机管内油污回收模式；
    控制所述空调器运行制冷模式；
    控制所述压缩机调整至预设的第一回收频率；
    调节所述节流装置的开度，以使得所述室内换热器的盘管温度小于等于预设温度；
    当所述盘管温度小于等于所述预设温度且持续第一预设时长后，控制所述空调器转换为制热模式；
    控制所述通断阀打开、所述节流装置打开至预设开度；
    其中，所述预设温度大于冷冻机油的凝固温度。
  2. 根据权利要求1所述的室内机的管内油污回收方法，其特征在于，在“控制所述空调器转换为制热模式”的步骤之后，所述方法还包括：
    控制所述压缩机调整至预设的第二回收频率。
  3. 根据权利要求2所述的室内机的管内油污回收方法，其特征在于，所述第二回收频率为室外环境温度对应的最高限值频率。
  4. 根据权利要求1所述的室内机的管内油污回收方法，其特征在于，在“调节所述节流装置的开度”的步骤之前，所述方法还包括：
    控制室外风机以最高转速运行。
  5. 根据权利要求1所述的室内机的管内油污回收方法，其特征在于， 所述预设开度为所述节流装置的最大开度。
  6. 根据权利要求1所述的室内机的管内油污回收方法，其特征在于，在“调节所述节流装置的开度”的步骤之前，所述方法还包括：
    控制室内风机停止运行。
  7. 根据权利要求1所述的室内机的管内油污回收方法，其特征在于，所述方法还包括：
    进入所述室内机管内油污回收模式时，关闭室内防冻结保护功能和室外环境温度限频功能。
  8. 根据权利要求6所述的室内机的管内油污回收方法，其特征在于，在“控制所述通断阀打开、所述节流装置打开至预设开度”的步骤之后，所述方法还包括：
    在所述通断阀打开、所述节流装置打开至预设开度的状态持续第二预设时长后，退出所述室内机管内油污回收模式。
  9. 根据权利要求8所述的室内机的管内油污回收方法，其特征在于，“退出所述室内机管内油污回收模式”的步骤进一步包括：
    控制所述空调器恢复至进入所述室内机管内油污回收模式之前的运行模式；
    控制所述压缩机恢复至进入所述室内机管内油污回收模式之前的频率；
    控制所述通断阀关闭。
  10. 根据权利要求9所述的室内机的管内油污回收方法，其特征在于，“退出所述室内机管内油污回收模式”的步骤还包括：
    控制室内风机开启，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三预设时长后，控制所述室内风机和所述导风板恢复至进入所述室内机管内油污回收模式之前的运行状态。
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