WO2023279616A1 - Indoor unit oil return control method - Google Patents

Indoor unit oil return control method Download PDF

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Publication number
WO2023279616A1
WO2023279616A1 PCT/CN2021/129819 CN2021129819W WO2023279616A1 WO 2023279616 A1 WO2023279616 A1 WO 2023279616A1 CN 2021129819 W CN2021129819 W CN 2021129819W WO 2023279616 A1 WO2023279616 A1 WO 2023279616A1
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WIPO (PCT)
Prior art keywords
oil return
indoor unit
ratio
frequency
heat exchanger
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PCT/CN2021/129819
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French (fr)
Chinese (zh)
Inventor
罗荣邦
崔俊
Original Assignee
青岛海尔空调器有限总公司
青岛海尔空调电子有限公司
海尔智家股份有限公司
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Publication of WO2023279616A1 publication Critical patent/WO2023279616A1/en

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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 air conditioner oil return, in particular to an indoor unit oil return control method.
  • the refrigeration oil inside the compressor has three functions: sealing the compression part, cooling the motor, and lubricating the moving parts. During the refrigerant cycle of the air conditioning system, the refrigeration oil will participate in the cycle along with the refrigerant.
  • the hairpin tube of the heat exchanger is an internally threaded copper tube, which affects the flow of the refrigerator oil, and the centrifugal force of the refrigerant flow causes some of the refrigerator oil to It 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.
  • problems such as insufficient lubrication of the compressor may also occur. Therefore, how to control the oil return of the indoor heat exchanger has become an urgent problem for air-conditioning manufacturers.
  • the application provides an oil return control method for 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 connected to the road.
  • the indoor heat exchanger is provided with a first pressure sensor
  • the outdoor heat exchanger is provided with a second pressure sensor.
  • the air conditioner also includes a recovery pipeline, one end of the recovery pipeline communicates with the outlet of the outdoor heat exchanger, and the other end of the recovery pipeline communicates with the suction port of the compressor, so An on-off valve is arranged on the recovery pipeline, and the on-off valve is a normally closed valve.
  • control methods include:
  • the second preset duration is longer than the first preset duration.
  • the step of "selectively performing the indoor unit oil return operation according to the judgment result" further includes:
  • the oil return operation of the indoor unit is performed.
  • the step of "selectively performing the indoor unit oil return operation according to the judgment result" further includes:
  • the first ratio is smaller than the first threshold and greater than or equal to a second threshold, then obtain the first operating frequency of the compressor;
  • the oil return operation of the indoor unit is selectively performed.
  • the step of "selectively performing the indoor unit oil return operation according to the judgment result" further includes:
  • the step of "selectively performing the indoor unit oil return operation according to the judgment result" further includes:
  • the third ratio is smaller than the first threshold and greater than or equal to the second threshold, perform the oil return operation of the indoor unit; and/or
  • control method further includes:
  • first operating frequency is greater than or equal to the first oil return frequency, further judge the magnitude of the first operating frequency and the second oil return frequency;
  • first operating frequency is greater than or equal to the second oil return frequency
  • control the air conditioner to maintain the current operating state until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold.
  • Indoor unit oil return operation If the first operating frequency is greater than or equal to the second oil return frequency, control the air conditioner to maintain the current operating state until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold.
  • the step of "selectively performing the indoor unit oil return operation according to the judgment result" further includes:
  • the step of "selectively performing the indoor unit oil return operation according to the judgment result" further includes:
  • the oil return operation of the indoor unit is not performed, and the air conditioner is controlled to maintain the current operating state.
  • the step of "executing the indoor unit oil return operation” further includes:
  • the on-off valve is controlled to open, and the throttling device is opened to a maximum opening.
  • control method further includes:
  • 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. There is a first pressure sensor, and a second pressure sensor is installed on the outdoor heat exchanger.
  • the air conditioner also includes a recovery pipeline, one end of the recovery pipeline communicates with the outlet of the outdoor heat exchanger, and the other end of the recovery pipeline communicates with the outlet of the compressor.
  • the suction port is connected, and an on-off valve is set on the recovery pipeline.
  • the on-off valve is a normally closed valve.
  • the control method includes: in the cooling mode, when the continuous operation time of the air conditioner reaches the first preset time, calculate the outdoor heat exchanger The first high-low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger; when the continuous operation time of the air conditioner reaches the second preset time, calculate the ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger The second high and low pressure ratio; judge the range of the first ratio between the second high and low pressure ratio and the first high and low pressure ratio; according to the judgment result, selectively execute the oil return operation of the indoor unit; wherein, the second preset duration greater than the first preset duration.
  • the present application can realize the effective oil return of the indoor unit, and ensure the lubrication effect of the compressor and the operation effect of the air conditioner. Specifically, by calculating the first high and low pressure ratio when the air conditioner's continuous operation time reaches the first preset time in cooling mode, and the second high and low pressure ratio when it reaches the second preset time, and judging the second high and low pressure The range of the first ratio between the ratio and the first high and low pressure ratio, and then selectively perform the oil return operation of the indoor unit based on the judgment result.
  • This application uses the high and low pressure ratio when the air conditioner is running to judge whether the indoor unit needs to return oil.
  • Oil operation when the oil return operation is required, the oil return operation is performed on the indoor unit, so that the refrigerating machine oil accumulated in the indoor unit returns to the compressor in time, which improves the heat exchange effect of the indoor unit and improves the operation stability of the compressor.
  • 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 indoor unit oil return control method of the present application.
  • Fig. 4 is a logic diagram of a possible implementation process of the indoor unit oil return control method 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 first pressure sensor 10 , and the first pressure sensor 10 is used to detect the pressure of the indoor heat exchanger 5 .
  • the coil pipe of the outdoor heat exchanger 3 is also provided with a second pressure sensor 11, and the second pressure sensor 11 is used to detect the pressure of the outdoor heat exchanger 3.
  • the principle of detecting the pressure of the heat exchanger by the pressure sensor is common knowledge in the field, and will not be repeated here.
  • the oil return control method of the indoor unit in this embodiment will be described below in conjunction with the structure of the above-mentioned air conditioner, but those skilled in the art can understand that the specific structural composition of the air conditioner is not static and can be adjusted by those skilled in the art.
  • the accumulator 9 may be omitted, or other components may be added on the basis of the structure of the above-mentioned air conditioner.
  • FIG. 2 is a system diagram of the air conditioner of the present application in heating mode
  • FIG. 3 is a flow chart of the oil return control method of the indoor unit of the present application.
  • the flow direction of the refrigerant is: compressor ⁇ four-way valve ⁇ outdoor heat exchanger ⁇ throttling device ⁇ indoor heat exchanger ⁇ four-way valve ⁇ compressor.
  • the refrigerant is in the state of high temperature and high pressure in the outdoor heat exchanger, and in the state of low temperature and low pressure in the indoor heat exchanger, so it is easier to accumulate refrigeration oil in the indoor heat exchanger.
  • the oil return control method of the indoor unit of the present application includes:
  • the first preset duration can be any value from 10min to 50min, preferably 30min in this application.
  • the first pressure sensor and the second pressure sensor The pressure of the indoor heat exchanger and the pressure of the outdoor heat exchanger are respectively detected, and then the first high-low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger is calculated.
  • the second preset duration is longer than the first preset duration, and the second preset duration can be any value from 30min to 90min, preferably 60min in this application, after the air conditioner runs in cooling mode for 30min , and then continue to run for 30 minutes, that is, when the continuous running time reaches 60 minutes, the pressure of the indoor heat exchanger and the pressure of the outdoor heat exchanger are respectively detected by the first pressure sensor and the second pressure sensor, and then the pressure of the outdoor heat exchanger and the pressure of the outdoor heat exchanger are calculated.
  • S105 Determine the range of the first ratio between the second high-low pressure ratio and the first high-low pressure ratio.
  • the first ratio is compared with the first threshold and the second threshold to determine the range of the first ratio.
  • the first threshold is greater than the second threshold.
  • the first threshold may be any value in the range of 1.3-1.6
  • the second threshold may be any value in the range of 1.05-1.3.
  • the step of "selectively performing the oil return operation of the indoor unit according to the judgment result" specifically includes:
  • the first ratio is greater than or equal to the first threshold, perform the oil return operation of the indoor unit.
  • the first ratio is greater than or equal to the first threshold, it proves that the high and low pressure ratio of the air conditioner increases greatly during continuous cooling operation, that is, the refrigerating machine oil in the indoor heat exchanger accumulates more, resulting in an increase in the high and low pressure of the air conditioner.
  • the oil return operation of the indoor unit needs to be performed immediately, so that the refrigerating machine oil accumulated in the indoor unit can be returned to the compressor.
  • the air conditioner If the first ratio is smaller than the second threshold, the oil return operation of the indoor unit is not performed, and the air conditioner is controlled to maintain the current operating state.
  • the first ratio is smaller than the second threshold, it proves that the high and low pressure ratio does not change much during continuous cooling operation of the air conditioner, the air conditioner operates relatively stably, and the oil return is normal. At this time, there is no need to perform the oil return operation of the indoor unit, and the air conditioner is controlled to maintain the current running state.
  • the first ratio is less than the first threshold and greater than or equal to the second threshold, obtain the first operating frequency of the compressor; determine the magnitude of the first operating frequency and the first oil return frequency.
  • the first ratio is less than the first threshold and greater than or equal to the second threshold, it proves that the high and low pressure ratio of the air conditioner has a certain increase during continuous cooling operation, and the refrigerating machine oil in the indoor heat exchanger has a certain accumulation.
  • the compressor when the compressor continues to run for a third preset time at the first oil return frequency, calculate the third high and low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger; determine the third high and low pressure ratio The range of the second ratio between the second high and low pressure ratio; if the second ratio is less than the first threshold and greater than or equal to the second threshold, control the compressor to increase the frequency to run at the second oil return frequency; if the second ratio If it is less than the second threshold, the air conditioner is controlled to maintain the current operating state until the ratio between the calculated high and low pressure ratios is greater than or equal to the first threshold before performing the oil return operation of the indoor unit.
  • the third preset duration can be any value from 5min to 20min. In this application, 10min is used.
  • the compressor continues to run at the first oil return frequency for 10 minutes, a good oil return effect has been achieved theoretically.
  • the compressor is controlled to continue to increase the frequency to the second oil return frequency. Oil return to the air conditioner with a higher oil return frequency.
  • the second ratio is less than the second threshold, it proves that the high and low pressure ratio of the air conditioner has dropped, which has a certain oil return effect.
  • the priority is to ensure the comfort of the indoor environment, and the air conditioner is controlled to maintain the current operating state and continue to run.
  • the oil return operation of the indoor unit is not performed until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold.
  • the interval between calculating the high-low pressure ratio twice successively can be set arbitrarily, such as 10 minutes or 20 minutes.
  • the air conditioner is controlled to take the current set temperature as the target temperature to control the air conditioner to continue running.
  • the high and low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger is obtained every 10 minutes. After obtaining at least two high and low pressure ratios continuously, calculate the ratio between the two high and low pressure ratios, and compare the ratio with the first threshold, until the ratio is greater than or equal to the first threshold, directly execute the oil return operation.
  • the compressor when the compressor continues to run for a fourth preset time at the second oil return frequency, calculate the fourth high and low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger; determine the fourth high and low pressure ratio The range of the third ratio between the third high and low pressure ratio; if the third ratio is less than the first threshold and greater than or equal to the second threshold, the indoor unit oil return operation will be performed; if the third ratio is less than the second threshold, then The air conditioner is controlled to maintain the current operating state until the ratio between the calculated high and low pressure ratios is greater than or equal to the first threshold before performing the oil return operation of the indoor unit.
  • the fourth preset duration can be any value from 5min to 20min. In this application, 10min is used.
  • 10min is used.
  • the compressor continues to run for 10min at the second oil return frequency, a good oil return effect has been achieved theoretically.
  • the machine performs forced oil return.
  • the priority is to ensure the comfort of the indoor environment, and the air conditioner is controlled to maintain the current operating state and continue to run.
  • the oil return operation of the indoor unit is not performed until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold.
  • the steps of "controlling the air conditioner to maintain the current operating state and continue to operate until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold before performing the oil return operation of the indoor unit" are similar to the aforementioned control process, I won't repeat them here.
  • the compressor when the compressor continues to run for a fifth preset time at the second oil return frequency, calculate the fifth high and low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger; determine the fifth high and low pressure ratio The range of the fourth ratio between the second high and low pressure ratio; if the fourth ratio is less than the first threshold and greater than or equal to the second threshold, perform the oil return operation of the indoor unit; if the fourth ratio is less than the second threshold, then The air conditioner is controlled to maintain the current operating state until the ratio between the calculated high and low pressure ratios is greater than or equal to the first threshold before performing the oil return operation of the indoor unit.
  • the fifth preset duration can be any value from 5min to 20min. In this application, 10min is used.
  • 10min is used.
  • the priority is to ensure the comfort of the indoor environment, and the air conditioner is controlled to maintain the current operating state and continue to run.
  • the oil return operation of the indoor unit is not performed until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold.
  • the steps of "controlling the air conditioner to maintain the current operating state and continue to operate until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold before performing the oil return operation of the indoor unit" are similar to the aforementioned control process, I won't repeat them here.
  • the air conditioner If the first operating frequency is greater than or equal to the second oil return frequency, control the air conditioner to maintain the current operating state until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold value before performing the indoor unit return oil operation. If the first operating frequency is greater than or equal to the second oil return frequency, it proves that the current compressor is operating at a relatively high frequency, and the oil return cannot be achieved by further increasing the frequency. At this time, the air conditioner can be controlled to maintain the current operating state until successively The oil return operation of the indoor unit is performed when the ratio between the two calculated high and low pressure ratios is greater than or equal to the first threshold.
  • the step of "performing the oil return operation of the indoor unit" further includes:
  • the normal operating frequency of the compressor is relatively high, and the four-way valve cannot perform reversing. Therefore, when the air conditioner starts to perform the oil return operation of the indoor unit, firstly, the compressor is lowered from the normal operating frequency to the first reversing frequency that allows the four-way valve to reversing, so that the four-way valve can be reversing and converted into heat mode.
  • the air conditioner operates in heating mode. If the indoor unit continues to supply air, it will blow hot air to the room, which will bring a bad experience to the user. At this time, the indoor fan is controlled to run for the sixth preset time to blow out the residual cold, and then stop running to prevent the air from becoming hot and affecting the user experience.
  • the sixth preset duration may be any value in 10s-1min, and may be 30s in this application.
  • the frequency of the compressor is controlled to increase to the third oil return frequency.
  • the third oil return frequency may be the highest frequency of the compressor. At this frequency, the compressor can increase the temperature and pressure of the refrigerant in the shortest time, thereby improving the oil return effect.
  • the control on-off valve is opened, and the throttling device is opened to the maximum opening.
  • 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 refrigerating machine oil inside the coil is driven by the high-temperature refrigerant
  • the recovery of the engine oil is realized by returning to the reservoir through the recovery line. Control the throttling device to open to the maximum opening, so that the high-temperature and high-pressure refrigerant can pass quickly, reduce the pressure drop in the process of refrigerant flow, and improve the oil return effect of the indoor unit.
  • the control method further includes: after the on-off valve is opened for the seventh preset time period, controlling The frequency of the compressor is reduced to the second reversing frequency; the reversing of the four-way valve is controlled to switch to the cooling mode; the indoor fan is controlled to start running; the second operating frequency is determined based on the set temperature, and the compressor is controlled to run at the second operating frequency ;Control the on-off valve to close.
  • the seventh preset duration can be any value in 5min-15min, and in this application, it is preferably 10min.
  • the throttling device and the on-off valve are opened for 10 minutes, the high-temperature and high-pressure refrigerant has circulated many times, which is enough to produce a better oil return effect. Therefore, when the throttling device and the on-off valve are opened for 10 minutes, the indoor unit can return oil operation.
  • the air conditioner needs to return to the operating mode before entering the oil return operation, so as to continue to adjust the indoor temperature.
  • the compressor is controlled to decrease from the current operating frequency to the second reversing frequency that allows the four-way valve to reversing, so that the four-way valve can be reversed, converted to cooling mode, and the indoor fan is controlled to start running. temperature, determine the second operating frequency of the compressor, and then control the compressor to run at the second operating frequency and control the on-off valve to close. In this way, the refrigerant flows in the normal cooling mode. So far, the oil return operation is over.
  • the method of exiting the oil return operation of the indoor unit is not limited to the above-mentioned one.
  • the air deflector of the indoor unit can send air upwards while the indoor fan is turned on, so as to prevent the user from having a bad user experience when the temperature of the indoor heat exchanger coil is too high when the air conditioner just switches to cooling mode.
  • the throttling device can be controlled to maintain the maximum opening.
  • the throttling device Since the refrigerant circulates between the compressor and the indoor heat exchanger during the oil return operation of the indoor unit, resulting in the lack of refrigerant in the outdoor heat exchanger, the throttling device maintains the maximum opening. temperature, so that the refrigerant quickly fills the outdoor heat exchanger, so as to realize the normal circulation of the refrigerant as soon as possible.
  • the rapid flow of high-temperature and high-pressure refrigerant can be used to impact the inside of the coil of the indoor heat exchanger, so that the refrigerating machine oil
  • the refrigerant is directly returned to the inside of the accumulator through the recovery pipeline to achieve efficient oil return.
  • the application can use the recovery pipeline to recover the refrigerating machine oil during the oil return operation of the indoor unit, so that after the high-temperature and high-pressure refrigerant flushes the indoor heat exchanger, Instead of going through the outdoor heat exchanger again, the refrigerating machine oil is directly brought back to the liquid receiver for recovery, which reduces the flow of high-temperature refrigerant, reduces the pressure drop along the way, and improves the oil return effect of the indoor unit.
  • the above embodiment is described in conjunction with the comparison between the first ratio and the first threshold and the second threshold, it is obvious that those skilled in the art can adjust the number of thresholds. without departing from the principles of the application.
  • the first ratio is only compared with one threshold, or compared with three or four thresholds, and so on.
  • the specific operations in the above-mentioned embodiment when the first ratio is less than the first threshold and greater than or equal to the second threshold are not static, and those skilled in the art can Make adjustments, such adjustments include but are not limited to adjustments to the quantity of oil return frequency, adjustments to preset duration, adjustments to deletion of steps in some intermediate processes, etc.
  • FIG. 4 is a logic diagram of a possible implementation process of the indoor unit oil return control method of the present application.
  • step S203 is executed.
  • step S205 is executed to calculate K2/K1 and determine whether K2/K1 ⁇ 1.5 holds true.
  • step S231 is executed; otherwise, when the judgment result is not established, step S207 is executed.
  • step S207 further determining whether K2/K1 ⁇ 1.1 is established.
  • step S209 is executed; otherwise, when the judgment result is not established, step S211 is executed.
  • step S211 Obtain the operating frequency f of the compressor and determine whether the operating frequency f ⁇ f1 holds true.
  • step S213 is executed; otherwise, when the judgment result is not established, step S221 is executed.
  • step S215 is executed to calculate K3/K2 and determine whether 1.1 ⁇ K3/K2 ⁇ 1.5 holds true.
  • step S217 is executed; otherwise, when the judgment result is not established, step S227 is executed.
  • step S219 is executed to calculate K4/K3 and determine whether 1.1 ⁇ K4/K3 ⁇ 1.5 holds true.
  • step S231 is executed; otherwise, when the judgment result is false, step S227 is executed.
  • step S225 is executed to calculate K5/K2 and determine whether 1.1 ⁇ K5/K2 ⁇ 1.5 holds true.
  • step S231 is executed; otherwise, when the judgment result is false, step S227 is executed.
  • the above air conditioner also includes some other known structures, such as a processor, a controller, a memory, etc.
  • the memory includes but not limited to random access memory, flash memory, read-only memory, programmable read-only memory, Volatile memory, non-volatile memory, serial memory, parallel memory or registers, etc.
  • processors include but not limited to CPLD/FPGA, DSP, ARM processors, MIPS processors, etc.

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Abstract

The present invention relates to the technical field of air conditioner oil return, and in particular, to an indoor unit oil return control method. The present application aims to solve the problem of how to ensure oil return of an indoor unit. For this purpose, the air conditioner of the present application comprises a recovery pipeline, wherein one end of the recovery pipeline is communicated with an outlet of an outdoor heat exchanger, the other end of the recovery pipeline is communicated with an air suction port of the compressor, and an on-off valve is provided on the recovery pipeline. The control method comprises: in a refrigeration mode, when the continuous operation duration of an air conditioner reaches a first preset duration, calculating a first high-low pressure ratio of the pressure of an outdoor heat exchanger to the pressure of an indoor heat exchanger; when the continuous operation duration of the air conditioner reaches a second preset duration, calculating a second high-low pressure ratio of the pressure of the outdoor heat exchanger to the pressure of the indoor heat exchanger; determining a range where a first ratio of the second high-low pressure ratio to the first high-low pressure ratio is located; and selectively executing an indoor unit oil return operation according to the determination result. According to the present application, effective oil return of the indoor unit can be realized, and the lubricating effect of the compressor and the operation effect of the air conditioner are ensured.

Description

室内机回油控制方法Indoor Unit Oil Return Control Method 技术领域technical field
本发明涉及空调回油技术领域，具体涉及一种室内机回油控制方法。The invention relates to the technical field of air conditioner oil return, in particular to an indoor unit oil return control method.
背景技术Background technique
压缩机内部的冷冻机油有三个作用：密封压缩部分、冷却电机马达、润滑运动部件。在空调***的冷媒循环过程中，冷冻机油会跟随冷媒一起参与循环。The refrigeration oil inside the compressor has three functions: sealing the compression part, cooling the motor, and lubricating the moving parts. During the refrigerant cycle of the air conditioning system, the refrigeration oil will participate in the cycle along with the refrigerant.
制冷条件下，当冷冻机油跟随冷媒循环至室内换热器时，由于目前换热器的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。同时，由于部分冷冻机油没有及时回到压缩机内部，还会导致压缩机润滑不充分等问题出现。因此，如何对室内换热器进行回油控制成为空调厂家亟待解决的问题。Under refrigeration conditions, when the refrigerator oil follows the refrigerant circulation to the indoor heat exchanger, the hairpin tube of the heat exchanger is an internally threaded copper tube, which affects the flow of the refrigerator oil, and the centrifugal force of the refrigerant flow causes some of the refrigerator oil to It 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. At the same time, because part of the refrigerating machine oil does not return to the compressor in time, problems such as insufficient lubrication of the compressor may also occur. Therefore, how to control the oil return of the indoor heat exchanger has become an urgent problem for air-conditioning manufacturers.
相应地，本领域需要一种新的室内机回油控制方法来解决上述问题。Correspondingly, a new indoor unit oil return control method is needed in the art to solve the above problems.
发明内容Contents of the invention
为了解决现有技术中的上述至少一个问题，即为了解决如何保证室内机回油的问题，本申请提供了一种室内机回油控制方法，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，所述室内换热器上设置有第一压力传感器，所述室外换热器上设置有第二压力传感器，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，In order to solve at least one of the above-mentioned problems in the prior art, that is, to solve the problem of how to ensure the oil return of the indoor unit, the application provides an oil return control method for 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 connected to the road. The indoor heat exchanger is provided with a first pressure sensor, and the outdoor heat exchanger is provided with a second pressure sensor. sensor, the air conditioner also includes a recovery pipeline, one end of the recovery pipeline communicates with the outlet of the outdoor heat exchanger, and the other end of the recovery pipeline communicates with the suction port of the compressor, so An on-off valve is arranged on the recovery pipeline, and the on-off valve is a normally closed valve.
所述控制方法包括：The control methods include:
制冷模式下，当所述空调器的持续运行时长达到第一预设时长时，计算所述室外换热器的压力与所述室内换热器的压力之间的第一高低压比；In the cooling mode, when the continuous operation time of the air conditioner reaches a first preset time, calculate a first high-low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger;
当所述空调器的持续运行时长达到第二预设时长时，计算所述室外换热器的压力与所述室内换热器的压力之间的第二高低压比；calculating a second high-low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger when the continuous operation time of the air conditioner reaches a second preset time;
判断所述第二高低压比与所述第一高低压比之间的第一比值所处的范围；judging the range of the first ratio between the second high-low pressure ratio and the first high-low pressure ratio;
根据判断结果，选择性地执行室内机回油操作；Selectively execute the oil return operation of the indoor unit according to the judgment result;
其中，所述第二预设时长大于所述第一预设时长。Wherein, the second preset duration is longer than the first preset duration.
在上述室内机回油控制方法的优选技术方案中，“根据判断结果，选择性地执行室内机回油操作”的步骤进一步包括：In the preferred technical solution of the above indoor unit oil return control method, the step of "selectively performing the indoor unit oil return operation according to the judgment result" further includes:
如果所述第一比值大于等于第一阈值，则执行所述室内机回油操作。If the first ratio is greater than or equal to a first threshold, the oil return operation of the indoor unit is performed.
在上述室内机回油控制方法的优选技术方案中，“根据判断结果，选择性地执行室内机回油操作”的步骤进一步包括：In the preferred technical solution of the above indoor unit oil return control method, the step of "selectively performing the indoor unit oil return operation according to the judgment result" further includes:
如果所述第一比值小于所述第一阈值且大于等于第二阈值，则获取所述压缩机的第一运行频率；If the first ratio is smaller than the first threshold and greater than or equal to a second threshold, then obtain the first operating frequency of the compressor;
判断所述第一运行频率与第一回油频率的大小；Judging the magnitude of the first operating frequency and the first oil return frequency;
如果所述第一运行频率小于所述第一回油频率，则控制所述压缩机升频至所述第一回油频率运行；If the first operating frequency is lower than the first oil return frequency, control the compressor to increase the frequency to operate at the first oil return frequency;
当所述压缩机以所述第一回油频率持续运行第三预设时长时，计算所述室外换热器的压力与所述室内换热器的压力之间的第三高低压比；calculating a third high/low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger when the compressor continues to operate at the first oil return frequency for a third preset time;
判断所述第三高低压比与所述第二高低压比之间的第二比值所处的范围；judging the range of the second ratio between the third high-low pressure ratio and the second high-low pressure ratio;
根据判断结果，选择性地执行所述室内机回油操作。According to the judgment result, the oil return operation of the indoor unit is selectively performed.
在上述室内机回油控制方法的优选技术方案中，“根据判断结果，选择性地执行所述室内机回油操作”的步骤进一步包括：In the preferred technical solution of the above indoor unit oil return control method, the step of "selectively performing the indoor unit oil return operation according to the judgment result" further includes:
如果所述第二比值小于所述第一阈值且大于等于所述第二阈值，则控制所述压缩机升频至第二回油频率运行；If the second ratio is less than the first threshold and greater than or equal to the second threshold, control the compressor to increase the frequency to run at the second oil return frequency;
当所述压缩机以所述第二回油频率持续运行第四预设时长时，计算所述室外换热器的压力与所述室内换热器的压力之间的第四高低压比；calculating a fourth high/low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger when the compressor continues to operate for a fourth preset time at the second oil return frequency;
判断所述第四高低压比与所述第三高低压比之间的第三比值所处的 范围；Judging the range of the third ratio between the fourth high and low pressure ratio and the third high and low pressure ratio;
根据判断结果，选择性地执行所述室内机回油操作；并且/或者According to the judgment result, selectively execute the oil return operation of the indoor unit; and/or
如果所述第二比值小于所述第二阈值，则控制所述空调器保持当前运行状态，直至先后两次计算出的高低压比之间的比值大于等于所述第一阈值时再执行所述室内机回油操作。If the second ratio is smaller than the second threshold, control the air conditioner to maintain the current operating state until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold and then execute the Indoor unit oil return operation.
在上述室内机回油控制方法的优选技术方案中，“根据判断结果，选择性地执行所述室内机回油操作”的步骤进一步包括：In the preferred technical solution of the above indoor unit oil return control method, the step of "selectively performing the indoor unit oil return operation according to the judgment result" further includes:
如果所述第三比值小于所述第一阈值且大于等于所述第二阈值，则执行所述室内机回油操作；并且/或者If the third ratio is smaller than the first threshold and greater than or equal to the second threshold, perform the oil return operation of the indoor unit; and/or
如果所述第三比值小于所述第二阈值，则控制所述空调器保持当前运行状态，直至先后两次计算出的高低压比之间的比值大于等于所述第一阈值时再执行所述室内机回油操作。If the third ratio is smaller than the second threshold, control the air conditioner to maintain the current operating state until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold and then execute the Indoor unit oil return operation.
在上述室内机回油控制方法的优选技术方案中，所述控制方法还包括：In the preferred technical solution of the above indoor unit oil return control method, the control method further includes:
如果所述第一运行频率大于等于所述第一回油频率，则进一步判断所述第一运行频率与所述第二回油频率的大小；If the first operating frequency is greater than or equal to the first oil return frequency, further judge the magnitude of the first operating frequency and the second oil return frequency;
如果所述第一运行频率小于所述第二回油频率，则控制所述压缩机升频至第二回油频率运行；If the first operating frequency is lower than the second oil return frequency, control the compressor to increase the frequency to run at the second oil return frequency;
当所述压缩机以所述第二回油频率持续运行第五预设时长时，计算所述室外换热器的压力与所述室内换热器的压力之间的第五高低压比；calculating a fifth high and low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger when the compressor continues to run for a fifth preset time at the second oil return frequency;
判断所述第五高低压比与所述第二高低压比之间的第四比值所处的范围；Judging the range of the fourth ratio between the fifth high and low pressure ratio and the second high and low pressure ratio;
根据判断结果，选择性地执行所述室内机回油操作；并且/或者According to the judgment result, selectively execute the oil return operation of the indoor unit; and/or
如果所述第一运行频率大于等于所述第二回油频率，则控制空调器保持当前运行状态，直至先后两次计算出的高低压比之间的比值大于所述等于第一阈值时再执行室内机回油操作。If the first operating frequency is greater than or equal to the second oil return frequency, control the air conditioner to maintain the current operating state until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold. Indoor unit oil return operation.
在上述室内机回油控制方法的优选技术方案中，“根据判断结果，选择性地执行所述室内机回油操作”的步骤进一步包括：In the preferred technical solution of the above indoor unit oil return control method, the step of "selectively performing the indoor unit oil return operation according to the judgment result" further includes:
如果所述第四比值小于所述第一阈值且大于等于所述第二阈值，则执行所述室内机回油操作；并且/或者If the fourth ratio is smaller than the first threshold and greater than or equal to the second threshold, perform the oil return operation of the indoor unit; and/or
如果所述第四比值小于所述第二阈值，则控制所述空调器保持当前运行状态，直至先后两次计算出的高低压比之间的比值大于等于所述第一阈值时再执行所述室内机回油操作。If the fourth ratio is smaller than the second threshold, control the air conditioner to maintain the current operating state until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold and then execute the Indoor unit oil return operation.
在上述室内机回油控制方法的优选技术方案中，“根据判断结果，选择性地执行室内机回油操作”的步骤进一步包括：In the preferred technical solution of the above indoor unit oil return control method, the step of "selectively performing the indoor unit oil return operation according to the judgment result" further includes:
如果所述第一比值小于第二阈值，则不执行所述室内机回油操作，控制所述空调器保持当前运行状态。If the first ratio is smaller than the second threshold, the oil return operation of the indoor unit is not performed, and the air conditioner is controlled to maintain the current operating state.
在上述室内机回油控制方法的优选技术方案中，“执行室内机回油操作”的步骤进一步包括：In the preferred technical solution of the above indoor unit oil return control method, the step of "executing the indoor unit oil return operation" further includes:
控制所述压缩机降频至第一换向频率；controlling the frequency reduction of the compressor to the first commutation frequency;
控制所述四通阀换向，以转换成制热模式；Control the reversing of the four-way valve to switch to the heating mode;
在所述四通阀换向后，控制室内风机继续运行第六预设时长后关闭；After the four-way valve is reversed, the fan in the control room continues to run for a sixth preset time and then shuts down;
控制所述压缩机升频至第三回油频率；controlling the frequency of the compressor to increase to the third oil return frequency;
控制所述通断阀打开，所述节流装置打开至最大开度。The on-off valve is controlled to open, and the throttling device is opened to a maximum opening.
在上述室内机回油控制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最大开度”的步骤之后，所述控制方法还包括：In the preferred technical solution of the above-mentioned indoor unit oil return control method, after the step of "controlling the on-off valve to open, and the throttle device to open to the maximum opening degree", the control method further includes:
在所述通断阀打开并持续第第七预设时长后，控制所述压缩机降频至第二换向频率；After the on-off valve is opened for a seventh preset period of time, controlling the frequency of the compressor to decrease to the second reversing frequency;
控制所述四通阀换向，以转换成制冷模式；Control the reversing of the four-way valve to switch to the cooling mode;
控制所述室内风机启动运行；controlling the indoor fan to start and run;
基于设定温度确定第二运行频率，并控制所述压缩机按照所述第二运行频率运行；determining a second operating frequency based on the set temperature, and controlling the compressor to operate at the second operating frequency;
控制所述通断阀关闭。Control the on-off valve to close.
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，室内换热器上设置有第一压力传感器，室外换热器上设置有第二压力传感器，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，控制方法包括：制冷模式下，当空调器的持续运行时长达到第一预设时长时，计算室外换热器的压力与室内换热器的压力之间的第一高低压比；当空调器的持续运行时长达到第二预设时长时，计 算室外换热器的压力与室内换热器的压力之间的第二高低压比；判断第二高低压比与第一高低压比之间的第一比值所处的范围；根据判断结果，选择性地执行室内机回油操作；其中，第二预设时长大于第一预设时长。It should be noted that, in the preferred technical solution of this application, 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. There is a first pressure sensor, and a second pressure sensor is installed on the outdoor heat exchanger. The air conditioner also includes a recovery pipeline, one end of the recovery pipeline communicates with the outlet of the outdoor heat exchanger, and the other end of the recovery pipeline communicates with the outlet of the compressor. The suction port is connected, and an on-off valve is set on the recovery pipeline. The on-off valve is a normally closed valve. The control method includes: in the cooling mode, when the continuous operation time of the air conditioner reaches the first preset time, calculate the outdoor heat exchanger The first high-low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger; when the continuous operation time of the air conditioner reaches the second preset time, calculate the ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger The second high and low pressure ratio; judge the range of the first ratio between the second high and low pressure ratio and the first high and low pressure ratio; according to the judgment result, selectively execute the oil return operation of the indoor unit; wherein, the second preset duration greater than the first preset duration.
通过上述控制方式，本申请能够实现室内机的有效回油，保证压缩机润滑效果和空调运行效果。具体而言，通过在制冷模式下计算空调器的持续运行时长达到第一预设时长时的第一高低压比，以及达到第二预设时长的第二高低压比，并判断第二高低压比与第一高低压比之间的第一比值所处的范围，然后基于判断结果选择性地执行室内机回油操作，本申请利用空调器运行时的高低压比来判断室内机是否需要回油操作，当需要回油操作时对室内机执行回油操作，使得室内机内积存的冷冻机油及时回到压缩机中，提高室内机的换热效果，提高压缩机运行稳定性。Through the above control method, the present application can realize the effective oil return of the indoor unit, and ensure the lubrication effect of the compressor and the operation effect of the air conditioner. Specifically, by calculating the first high and low pressure ratio when the air conditioner's continuous operation time reaches the first preset time in cooling mode, and the second high and low pressure ratio when it reaches the second preset time, and judging the second high and low pressure The range of the first ratio between the ratio and the first high and low pressure ratio, and then selectively perform the oil return operation of the indoor unit based on the judgment result. This application uses the high and low pressure ratio when the air conditioner is running to judge whether the indoor unit needs to return oil. Oil operation, when the oil return operation is required, the oil return operation is performed on the indoor unit, so that the refrigerating machine oil accumulated in the indoor unit returns to the compressor in time, which improves the heat exchange effect of the indoor unit and improves the operation stability of the compressor.
附图说明Description of drawings
下面参照附图来描述本申请的室内机回油控制方法。附图中：The oil return control method of the indoor unit of the present application will be described below with reference to the accompanying drawings. In the attached picture:
图1为本申请的空调器在制冷模式下的***图；Fig. 1 is the system diagram of the air conditioner of the present application in cooling mode;
图2为本申请的空调器在制热模式下的***图；Fig. 2 is the system diagram of the air conditioner of the present application in heating mode;
图3为本申请的室内机回油控制方法的流程图；Fig. 3 is the flowchart of the indoor unit oil return control method of the present application;
图4为本申请的室内机回油控制方法的一种可能的实施过程的逻辑图。Fig. 4 is a logic diagram of a possible implementation process of the indoor unit oil return control method of the present application.
附图标记列表List of reference signs
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、第一压力传感器；11、第二压力传感器。1. Compressor; 2. Four-way valve; 3. Outdoor heat exchanger; 4. Throttle device; 5. Indoor heat exchanger; 6. Refrigerant pipeline; 7. Recovery pipeline; 8. On-off valve; 9 . Liquid reservoir; 10. The first pressure sensor; 11. The second pressure sensor.
具体实施方式detailed description
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。Preferred embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application. For example, although the detailed steps of the method of the present application are described in detail below, those skilled in the art can combine, split and change the order of the above steps without departing from the basic principles of the present application. The scheme does not change the basic idea of the application, and therefore also falls within the scope of protection of the application.
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”、“第八”仅用于描述目的，而不能理解为指示或暗示相对重要性。It should be noted that, in the description of this application, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "seventh" Eight" is used for descriptive purposes only and is not to be construed as indicating or implying relative importance.
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。It should also be noted that, in the description of this application, unless otherwise clearly specified and limited, the term "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. Those skilled in the art can understand the specific meanings of the above terms in this application according to specific situations.
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。Referring first to FIG. 1 , the structure of the air conditioner of the present application will be described. Wherein, FIG. 1 is a system diagram of the air conditioner of the present application in cooling mode.
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。As shown in FIG. 1 , in a possible implementation, 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.
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。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. On the pipeline 6 , the second end of the copper tube is arranged on the refrigerant pipeline 6 between the S interface of the four-way valve 2 and the inlet of the liquid storage tank 9 . 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. Of course, the on-off valve 8 can also be an electronically controlled valve such as an electronic expansion valve.
为实现下述方法，本申请的室内换热器5的盘管上还设置有第一压力传感器10，第一压力传感器10用于检测室内换热器5的压力。室外换热器3的盘管上还设置有第二压力传感器11，第二压力传感器11用于检 测室外换热器3的压力。通过压力传感器检测换热器的压力的原理本领域公知常识，在此不再赘述。In order to realize the following method, the coil of the indoor heat exchanger 5 of the present application is further provided with a first pressure sensor 10 , and the first pressure sensor 10 is used to detect the pressure of the indoor heat exchanger 5 . The coil pipe of the outdoor heat exchanger 3 is also provided with a second pressure sensor 11, and the second pressure sensor 11 is used to detect the pressure of the outdoor heat exchanger 3. The principle of detecting the pressure of the heat exchanger by the pressure sensor is common knowledge in the field, and will not be repeated here.
以下本实施例的室内机回油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，储液器9可以省略，或者在上述空调器的结构的基础上增加其他部件等。The oil return control method of the indoor unit in this embodiment will be described below in conjunction with the structure of the above-mentioned air conditioner, but those skilled in the art can understand that the specific structural composition of the air conditioner is not static and can be adjusted by those skilled in the art. For example, the accumulator 9 may be omitted, or other components may be added on the basis of the structure of the above-mentioned air conditioner.
下面结合图1、图2和图3，对本申请的室内机回油控制方法进行介绍。其中，图2为本申请的空调器在制热模式下的***图；图3为本申请的室内机回油控制方法的流程图。The oil return control method of the indoor unit of the present application will be introduced below with reference to FIG. 1 , FIG. 2 and FIG. 3 . Wherein, 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 oil return control method of the indoor unit of the present application.
如图1所示，当空调器运行制冷模式时，冷媒的流向为：压缩机→四通阀→室外换热器→节流装置→室内换热器→四通阀→压缩机。其中，冷媒在室外换热器中为高温高压状态，在室内换热器中为低温低压状态，因此室内换热器中更容易积攒冷冻机油。As shown in Figure 1, when the air conditioner is running in cooling mode, the flow direction of the refrigerant is: compressor→four-way valve→outdoor heat exchanger→throttling device→indoor heat exchanger→four-way valve→compressor. Among them, the refrigerant is in the state of high temperature and high pressure in the outdoor heat exchanger, and in the state of low temperature and low pressure in the indoor heat exchanger, so it is easier to accumulate refrigeration oil in the indoor heat exchanger.
如图3所示，为了解决如何保证室内机回油的问题，本申请的室内机回油控制方法包括：As shown in Figure 3, in order to solve the problem of how to ensure the oil return of the indoor unit, the oil return control method of the indoor unit of the present application includes:
S101、制冷模式下，当空调器的持续运行时长达到第一预设时长时，计算室外换热器的压力与室内换热器的压力之间的第一高低压比。S101. In the cooling mode, when the continuous running time of the air conditioner reaches a first preset time, calculate a first high-low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger.
一种可能的实施方式中，第一预设时长可以为10min-50min中的任意值，本申请优选为30min，在空调器以制冷模式持续运行30min时，通过第一压力传感器和第二压力传感器分别检测室内换热器的压力和室外换热器的压力，然后计算室外换热器的压力与室内换热器的压力之间的第一高低压比。In a possible implementation, the first preset duration can be any value from 10min to 50min, preferably 30min in this application. When the air conditioner continues to run in cooling mode for 30min, the first pressure sensor and the second pressure sensor The pressure of the indoor heat exchanger and the pressure of the outdoor heat exchanger are respectively detected, and then the first high-low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger is calculated.
S103、当空调器的持续运行时长达到第二预设时长时，计算室外换热器的压力与室内换热器的压力之间的第二高低压比。S103. When the continuous running time of the air conditioner reaches a second preset time, calculate a second high-low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger.
一种可能的实施方式中，第二预设时长大于第一预设时长，第二预设时长可以为30min-90min中的任意值，本申请优选为60min，在空调器以制冷模式运行30min之后，再继续运行30min、即持续运行时长达到60min时，再次通过第一压力传感器和第二压力传感器分别检测室内换热器的压力和室外换热器的压力，然后计算室外换热器的压力与室内换热器的压力之间的第二高低压比。In a possible implementation, the second preset duration is longer than the first preset duration, and the second preset duration can be any value from 30min to 90min, preferably 60min in this application, after the air conditioner runs in cooling mode for 30min , and then continue to run for 30 minutes, that is, when the continuous running time reaches 60 minutes, the pressure of the indoor heat exchanger and the pressure of the outdoor heat exchanger are respectively detected by the first pressure sensor and the second pressure sensor, and then the pressure of the outdoor heat exchanger and the pressure of the outdoor heat exchanger are calculated. The second high-low pressure ratio between the pressure of the indoor heat exchanger.
S105、判断第二高低压比与第一高低压比之间的第一比值所处的范围。S105. Determine the range of the first ratio between the second high-low pressure ratio and the first high-low pressure ratio.
一种可能的实施方式中，在获得第一高低压比与第二高低压比后，计算第二高低压比与第一高低压比之间的第一比值，并判断该第一比值所处的范围。其中，本申请中将第一比值与第一阈值和第二阈值进行比较，判断第一比值所处的范围。其中第一阈值大于第二阈值。本申请中，第一阈值可以为1.3-1.6中的任意值，第二阈值可以为1.05-1.3中的任意值。In a possible implementation manner, after obtaining the first high and low pressure ratio and the second high and low pressure ratio, calculate the first ratio between the second high and low pressure ratio and the first high and low pressure ratio, and determine the position of the first ratio range. Wherein, in the present application, the first ratio is compared with the first threshold and the second threshold to determine the range of the first ratio. Wherein the first threshold is greater than the second threshold. In this application, the first threshold may be any value in the range of 1.3-1.6, and the second threshold may be any value in the range of 1.05-1.3.
S107、根据判断结果，选择性地执行室内机回油操作。S107. Selectively execute the oil return operation of the indoor unit according to the judgment result.
一种可能的实施方式中，“根据判断结果，选择性地执行室内机回油操作”的步骤具体包括：In a possible implementation manner, the step of "selectively performing the oil return operation of the indoor unit according to the judgment result" specifically includes:
(1)如果第一比值大于等于第一阈值，则执行室内机回油操作。当第一比值大于等于第一阈值时，证明空调器在持续制冷运行时高低压比上升幅度较大，也即室内换热器内的冷冻机油积存较多，导致空调器的高低压力上升。此时需要立即执行室内机回油操作，以使得室内机中积存的冷冻机油回流至压缩机中。(1) If the first ratio is greater than or equal to the first threshold, perform the oil return operation of the indoor unit. When the first ratio is greater than or equal to the first threshold, it proves that the high and low pressure ratio of the air conditioner increases greatly during continuous cooling operation, that is, the refrigerating machine oil in the indoor heat exchanger accumulates more, resulting in an increase in the high and low pressure of the air conditioner. At this time, the oil return operation of the indoor unit needs to be performed immediately, so that the refrigerating machine oil accumulated in the indoor unit can be returned to the compressor.
(2)如果第一比值小于第二阈值，则不执行室内机回油操作，控制空调器保持当前运行状态。当第一比值小于第二阈值时，则证明空调器在持续制冷运行时高低压比变化不大，空调器运行较为稳定，回油正常。此时无需执行室内机回油操作，控制空调器保持当前运行状态。(2) If the first ratio is smaller than the second threshold, the oil return operation of the indoor unit is not performed, and the air conditioner is controlled to maintain the current operating state. When the first ratio is smaller than the second threshold, it proves that the high and low pressure ratio does not change much during continuous cooling operation of the air conditioner, the air conditioner operates relatively stably, and the oil return is normal. At this time, there is no need to perform the oil return operation of the indoor unit, and the air conditioner is controlled to maintain the current running state.
(3)如果第一比值小于第一阈值且大于等于第二阈值，则获取压缩机的第一运行频率；判断第一运行频率与第一回油频率的大小。当第一比值小于第一阈值且大于等于第二阈值时，证明空调器在持续制冷运行时高低压比有一定上升，室内换热器内的冷冻机油有一定积存。但又由于下述的室内机回油操作会暂时切换空调器的运行模式，终止对室内空气的调节，对用户体验有较大影响，因此在第一比值小于第一阈值且大于等于第二阈值时，先获取压缩机的第一运行频率，基于第一运行频率与第一回油频率和第二回油频率的大小确定如何操作。具体地：(3) If the first ratio is less than the first threshold and greater than or equal to the second threshold, obtain the first operating frequency of the compressor; determine the magnitude of the first operating frequency and the first oil return frequency. When the first ratio is less than the first threshold and greater than or equal to the second threshold, it proves that the high and low pressure ratio of the air conditioner has a certain increase during continuous cooling operation, and the refrigerating machine oil in the indoor heat exchanger has a certain accumulation. However, because the following indoor unit oil return operation will temporarily switch the operation mode of the air conditioner and stop the adjustment of indoor air, which will have a great impact on user experience, so when the first ratio is less than the first threshold and greater than or equal to the second threshold , first obtain the first operating frequency of the compressor, and determine how to operate based on the first operating frequency, the first oil return frequency, and the second oil return frequency. specifically:
(3a)如果第一运行频率小于第一回油频率，则控制压缩机升频至第一回油频率运行。现有技术中，为保证冷冻机油顺利回流至压缩机，通常都设置有回油频率，当空调器运行在回油频率时，冷冻机油能够较好 地回流至压缩机。本申请利用该技术手段，当第一运行频率小于第一回油频率时，先控制压缩机升频至第一回油频率运行，以期在不改变空调器的运行模式的前提下，使冷冻机油能够顺利回流至压缩机。(3a) If the first operating frequency is lower than the first oil return frequency, control the compressor to increase the frequency to run at the first oil return frequency. In the prior art, in order to ensure the smooth return of the refrigerating machine oil to the compressor, an oil return frequency is usually set. When the air conditioner is running at the oil return frequency, the refrigerating machine oil can be better returned to the compressor. This application utilizes this technical means. When the first operating frequency is lower than the first oil return frequency, first control the compressor to increase the frequency to run at the first oil return frequency, so as to make the refrigeration oil Can be smoothly returned to the compressor.
进一步地，当压缩机以第一回油频率持续运行第三预设时长时，计算室外换热器的压力与室内换热器的压力之间的第三高低压比；判断第三高低压比与第二高低压比之间的第二比值所处的范围；如果第二比值小于第一阈值且大于等于第二阈值，则控制压缩机升频至第二回油频率运行；如果第二比值小于第二阈值，则控制空调器保持当前运行状态，直至先后两次计算出的高低压比之间的比值大于等于第一阈值时再执行室内机回油操作。Further, when the compressor continues to run for a third preset time at the first oil return frequency, calculate the third high and low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger; determine the third high and low pressure ratio The range of the second ratio between the second high and low pressure ratio; if the second ratio is less than the first threshold and greater than or equal to the second threshold, control the compressor to increase the frequency to run at the second oil return frequency; if the second ratio If it is less than the second threshold, the air conditioner is controlled to maintain the current operating state until the ratio between the calculated high and low pressure ratios is greater than or equal to the first threshold before performing the oil return operation of the indoor unit.
具体地，第三预设时长可以为5min-20min中的任意值，本申请中取10min，当压缩机以第一回油频率持续运行10min时，理论上已经达到较好的回油效果，此时再次计算室外换热器的压力与室内换热器的压力之间的第三高低压比，并判断第三高低压比与第二高低压之间的第二比值所处的范围，来验证回油效果。如果第二比值仍处于第一阈值与第二阈值之间，证明当前回油效果较差，空调器的高低压比仍在上升，此时控制压缩机继续升频至第二回油频率运行，以更高的回油频率对空调器进行回油。当第二比值小于第二阈值时，证明空调器的高低压比有所回落，起到一定的回油效果，此时优先保证室内环境的舒适度，控制空调器保持当前的运行状态继续运行，直至先后两次计算出的高低压比之间的比值大于等于第一阈值时再执行室内机回油操作。其中，先后两次计算高低压比的间隔可以任意设定，如10min或20min等。Specifically, the third preset duration can be any value from 5min to 20min. In this application, 10min is used. When the compressor continues to run at the first oil return frequency for 10 minutes, a good oil return effect has been achieved theoretically. Calculate the third high and low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger again, and judge the range of the second ratio between the third high and low pressure ratio and the second high and low pressure to verify Oil return effect. If the second ratio is still between the first threshold and the second threshold, it proves that the current oil return effect is poor, and the high and low pressure ratio of the air conditioner is still rising. At this time, the compressor is controlled to continue to increase the frequency to the second oil return frequency. Oil return to the air conditioner with a higher oil return frequency. When the second ratio is less than the second threshold, it proves that the high and low pressure ratio of the air conditioner has dropped, which has a certain oil return effect. At this time, the priority is to ensure the comfort of the indoor environment, and the air conditioner is controlled to maintain the current operating state and continue to run. The oil return operation of the indoor unit is not performed until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold. Wherein, the interval between calculating the high-low pressure ratio twice successively can be set arbitrarily, such as 10 minutes or 20 minutes.
举例而言，在第二比值小于第二阈值时，控制空调器以当前的设定温度为目标温度控制空调器继续运行，运行过程中可以调节压缩机频率、节流装置开度、室内外风机风速等。并且，在继续运行过程中，每隔10min获取室外换热器的压力与室内换热器的压力之间的高低压比。在连续获取至少两个高低压比之后，计算两个高低压比之间的比值，并将比值与第一阈值进行比较，直至该比值大于等于第一阈值时，直接执行回油操作。For example, when the second ratio is less than the second threshold, the air conditioner is controlled to take the current set temperature as the target temperature to control the air conditioner to continue running. During operation, the frequency of the compressor, the opening degree of the throttling device, the indoor and outdoor fan wind speed etc. And, during the continuous operation, the high and low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger is obtained every 10 minutes. After obtaining at least two high and low pressure ratios continuously, calculate the ratio between the two high and low pressure ratios, and compare the ratio with the first threshold, until the ratio is greater than or equal to the first threshold, directly execute the oil return operation.
进一步地，当压缩机以第二回油频率持续运行第四预设时长时，计算室外换热器的压力与室内换热器的压力之间的第四高低压比；判断第 四高低压比与第三高低压比之间的第三比值所处的范围；如果第三比值小于第一阈值且大于等于第二阈值，则执行室内机回油操作；如果第三比值小于第二阈值，则控制空调器保持当前运行状态，直至先后两次计算出的高低压比之间的比值大于等于第一阈值时再执行室内机回油操作。Further, when the compressor continues to run for a fourth preset time at the second oil return frequency, calculate the fourth high and low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger; determine the fourth high and low pressure ratio The range of the third ratio between the third high and low pressure ratio; if the third ratio is less than the first threshold and greater than or equal to the second threshold, the indoor unit oil return operation will be performed; if the third ratio is less than the second threshold, then The air conditioner is controlled to maintain the current operating state until the ratio between the calculated high and low pressure ratios is greater than or equal to the first threshold before performing the oil return operation of the indoor unit.
具体地，第四预设时长可以为5min-20min中的任意值，本申请中取10min，当压缩机以第二回油频率持续运行10min时，理论上已经达到较好的回油效果，此时再次计算室外换热器的压力与室内换热器的压力之间的第四高低压比，并判断第四高低压比与第三高低压之间的第三比值所处的范围，来验证回油效果。如果第三比值仍处于第一阈值与第二阈值之间，证明当前回油效果较差，空调器的高低压比仍在上升，此时控制压缩机直接执行室内机回油操作，以对室内机进行强制回油。当第三比值小于第二阈值时，证明空调器的高低压比有所回落，起到一定的回油效果，此时优先保证室内环境的舒适度，控制空调器保持当前的运行状态继续运行，直至先后两次计算出的高低压比之间的比值大于等于第一阈值时再执行室内机回油操作。其中，“控制空调器保持当前的运行状态继续运行，直至先后两次计算出的高低压比之间的比值大于等于第一阈值时再执行室内机回油操作”的步骤与前述控制过程类似，在此不再赘述。Specifically, the fourth preset duration can be any value from 5min to 20min. In this application, 10min is used. When the compressor continues to run for 10min at the second oil return frequency, a good oil return effect has been achieved theoretically. Calculate the fourth high and low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger again, and judge the range of the third ratio between the fourth high and low pressure ratio and the third high and low pressure to verify Oil return effect. If the third ratio is still between the first threshold and the second threshold, it proves that the current oil return effect is poor, and the high and low pressure ratio of the air conditioner is still rising. The machine performs forced oil return. When the third ratio is less than the second threshold, it proves that the high and low pressure ratio of the air conditioner has dropped, which has a certain oil return effect. At this time, the priority is to ensure the comfort of the indoor environment, and the air conditioner is controlled to maintain the current operating state and continue to run. The oil return operation of the indoor unit is not performed until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold. Among them, the steps of "controlling the air conditioner to maintain the current operating state and continue to operate until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold before performing the oil return operation of the indoor unit" are similar to the aforementioned control process, I won't repeat them here.
(3b)如果第一运行频率大于等于第一回油频率但小于第二回油频率，则控制压缩机升频至第二回油频率运行。当第一运行频率大于第一回油频率但小于第二回油频率时，先控制压缩机升频至第二回油频率运行，以期在不改变空调器的运行模式的前提下，使冷冻机油能够顺利回流至压缩机。(3b) If the first operating frequency is greater than or equal to the first oil return frequency but less than the second oil return frequency, control the compressor to increase the frequency to run at the second oil return frequency. When the first operating frequency is higher than the first oil return frequency but lower than the second oil return frequency, first control the compressor to increase the frequency to run at the second oil return frequency, so as to make the refrigeration oil Can be smoothly returned to the compressor.
进一步地，当压缩机以第二回油频率持续运行第五预设时长时，计算室外换热器的压力与室内换热器的压力之间的第五高低压比；判断第五高低压比与第二高低压比之间的第四比值所处的范围；如果第四比值小于第一阈值且大于等于第二阈值，则执行室内机回油操作；如果第四比值小于第二阈值，则控制空调器保持当前运行状态，直至先后两次计算出的高低压比之间的比值大于等于第一阈值时再执行室内机回油操作。Further, when the compressor continues to run for a fifth preset time at the second oil return frequency, calculate the fifth high and low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger; determine the fifth high and low pressure ratio The range of the fourth ratio between the second high and low pressure ratio; if the fourth ratio is less than the first threshold and greater than or equal to the second threshold, perform the oil return operation of the indoor unit; if the fourth ratio is less than the second threshold, then The air conditioner is controlled to maintain the current operating state until the ratio between the calculated high and low pressure ratios is greater than or equal to the first threshold before performing the oil return operation of the indoor unit.
与前述类似地，第五预设时长可以为5min-20min中的任意值，本申请中取10min，当压缩机以第二回油频率持续运行10min时，理论上已经 达到较好的回油效果，此时再次计算室外换热器的压力与室内换热器的压力之间的第五高低压比，并判断第五高低压比与第二高低压之间的第四比值所处的范围，来验证回油效果。如果第四比值仍处于第一阈值与第二阈值之间，证明当前回油效果较差，空调器的高低压比仍在上升，此时控制压缩机直接执行室内机回油操作，以对室内机进行强制回油。当第四比值小于第二阈值时，证明空调器的高低压比有所回落，起到一定的回油效果，此时优先保证室内环境的舒适度，控制空调器保持当前的运行状态继续运行，直至先后两次计算出的高低压比之间的比值大于等于第一阈值时再执行室内机回油操作。其中，“控制空调器保持当前的运行状态继续运行，直至先后两次计算出的高低压比之间的比值大于等于第一阈值时再执行室内机回油操作”的步骤与前述控制过程类似，在此不再赘述。Similar to the above, the fifth preset duration can be any value from 5min to 20min. In this application, 10min is used. When the compressor continues to run for 10min at the second oil return frequency, a better oil return effect has been achieved theoretically. , at this time, calculate the fifth high and low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger again, and judge the range of the fourth ratio between the fifth high and low pressure ratio and the second high and low pressure, To verify the oil return effect. If the fourth ratio is still between the first threshold and the second threshold, it proves that the current oil return effect is poor, and the high and low pressure ratio of the air conditioner is still rising. The machine performs forced oil return. When the fourth ratio is less than the second threshold, it proves that the high and low pressure ratio of the air conditioner has dropped, which has a certain oil return effect. At this time, the priority is to ensure the comfort of the indoor environment, and the air conditioner is controlled to maintain the current operating state and continue to run. The oil return operation of the indoor unit is not performed until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold. Among them, the steps of "controlling the air conditioner to maintain the current operating state and continue to operate until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold before performing the oil return operation of the indoor unit" are similar to the aforementioned control process, I won't repeat them here.
(3c)如果第一运行频率大于等于第二回油频率，则控制空调器保持当前运行状态，直至先后两次计算出的高低压比之间的比值大于等于第一阈值时再执行室内机回油操作。如果第一运行频率大于等于第二回油频率，证明当前压缩机处于较高的频率运行，无法再进一步通过升频的方式实现回油，此时控制空调器保持当前运行状态即可，直至先后两次计算出的高低压比之间的比值大于等于第一阈值时再执行室内机回油操作。其中，“控制空调器保持当前的运行状态继续运行，直至先后两次计算出的高低压比之间的比值大于等于第一阈值时再执行室内机回油操作”的步骤与前述控制过程类似，在此不再赘述。(3c) If the first operating frequency is greater than or equal to the second oil return frequency, control the air conditioner to maintain the current operating state until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold value before performing the indoor unit return oil operation. If the first operating frequency is greater than or equal to the second oil return frequency, it proves that the current compressor is operating at a relatively high frequency, and the oil return cannot be achieved by further increasing the frequency. At this time, the air conditioner can be controlled to maintain the current operating state until successively The oil return operation of the indoor unit is performed when the ratio between the two calculated high and low pressure ratios is greater than or equal to the first threshold. Among them, the steps of "controlling the air conditioner to maintain the current operating state and continue to operate until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold before performing the oil return operation of the indoor unit" are similar to the aforementioned control process, I won't repeat them here.
在一种可能的实施方式中，“执行室内机回油操作”的步骤进一步包括：In a possible implementation manner, the step of "performing the oil return operation of the indoor unit" further includes:
控制压缩机降频至第一换向频率；控制四通阀换向，以转换成制热模式；在四通阀换向后，控制室内风机继续运行第六预设时长后关闭；控制压缩机升频至第三回油频率；控制通断阀打开，节流装置打开至最大开度。Control the frequency reduction of the compressor to the first reversing frequency; control the reversing of the four-way valve to switch to the heating mode; after the reversing of the four-way valve, control the indoor fan to continue to run for the sixth preset time and then turn off; control the compressor Increase the frequency to the third oil return frequency; control the on-off valve to open, and the throttling device to open to the maximum opening.
具体地，压缩机的正常工作频率较高，四通阀不能进行换向。因此，在空调器开始执行室内机回油操作时，首先压缩机从正常的工作频率降低至能够允许四通阀进行换向的第一换向频率，以便四通阀能够换向，转换成制热模式。Specifically, the normal operating frequency of the compressor is relatively high, and the four-way valve cannot perform reversing. Therefore, when the air conditioner starts to perform the oil return operation of the indoor unit, firstly, the compressor is lowered from the normal operating frequency to the first reversing frequency that allows the four-way valve to reversing, so that the four-way valve can be reversing and converted into heat mode.
在四通阀换向后，空调器运行制热模式，室内机如果继续送风将向室内吹热风，给用户带来不好的使用体验。此时，控制室内风机运行第六预设时长，将余冷吹出，然后停止运行，避免出风变热，影响用户体验。其中，第六预设时长可以为10s-1min中的任意值，本申请中可以为30s。After the four-way valve is reversed, the air conditioner operates in heating mode. If the indoor unit continues to supply air, it will blow hot air to the room, which will bring a bad experience to the user. At this time, the indoor fan is controlled to run for the sixth preset time to blow out the residual cold, and then stop running to prevent the air from becoming hot and affecting the user experience. Wherein, the sixth preset duration may be any value in 10s-1min, and may be 30s in this application.
四通阀换向后，控制压缩机升频至第三回油频率，本申请中第三回油频率可以为压缩机的最高频率。在该频率下，压缩机能够以最短的时间提高冷媒的温度和压力，从而提高回油效果。After the four-way valve is reversed, the frequency of the compressor is controlled to increase to the third oil return frequency. In this application, the third oil return frequency may be the highest frequency of the compressor. At this frequency, the compressor can increase the temperature and pressure of the refrigerant in the shortest time, thereby improving the oil return effect.
当运行模式切换为制热模式后，控制通断阀打开，节流装置打开至最大开度。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，盘管内部的冷冻机油在高温冷媒的带动下通过回收管路回流到储液器，实现对机油的回收。控制节流装置打开至最大开度，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，提高室内机回油效果。When the operating mode is switched to the heating mode, the control on-off valve is opened, and the throttling device is opened to the maximum opening. At this time, as shown by the arrow in Figure 2, 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 refrigerating machine oil inside the coil is driven by the high-temperature refrigerant The recovery of the engine oil is realized by returning to the reservoir through the recovery line. Control the throttling device to open to the maximum opening, so that the high-temperature and high-pressure refrigerant can pass quickly, reduce the pressure drop in the process of refrigerant flow, and improve the oil return effect of the indoor unit.
一种可能的实施方式中，在“控制通断阀打开，节流装置打开至最大开度”的步骤之后，控制方法还包括：在通断阀打开并持续第第七预设时长后，控制压缩机降频至第二换向频率；控制四通阀换向，以转换成制冷模式；控制室内风机启动运行；基于设定温度确定第二运行频率，并控制压缩机按照第二运行频率运行；控制通断阀关闭。In a possible implementation, after the step of "controlling the opening of the on-off valve and opening the throttling device to the maximum opening degree", the control method further includes: after the on-off valve is opened for the seventh preset time period, controlling The frequency of the compressor is reduced to the second reversing frequency; the reversing of the four-way valve is controlled to switch to the cooling mode; the indoor fan is controlled to start running; the second operating frequency is determined based on the set temperature, and the compressor is controlled to run at the second operating frequency ;Control the on-off valve to close.
其中，第七预设时长可以为5min-15min中的任意值，本申请优选为10min。当节流装置和通断阀打开的时间持续10min时，高温高压冷媒已经循环多次，足以产生较佳的回油效果，因此在节流装置和通断阀打开10min时，可以退出室内机回油操作。Wherein, the seventh preset duration can be any value in 5min-15min, and in this application, it is preferably 10min. When the throttling device and the on-off valve are opened for 10 minutes, the high-temperature and high-pressure refrigerant has circulated many times, which is enough to produce a better oil return effect. Therefore, when the throttling device and the on-off valve are opened for 10 minutes, the indoor unit can return oil operation.
具体地，在室内机回油操作执行完毕后，空调器需要恢复到进入回油操作之前的运行模式，以继续调节室内温度。此时，控制压缩机从当前的工作频率降低至能够允许四通阀进行换向的第二换向频率，以便四通阀能够换向，转换成制冷模式、控制室内风机启动运行、基于设定温度，确定压缩机的第二运行频率，然后控制压缩机以该第二运行频率运行、控制通断阀关闭。如此，冷媒以正常制冷模式的流向流动。至此，回油操作结束。Specifically, after the oil return operation of the indoor unit is completed, the air conditioner needs to return to the operating mode before entering the oil return operation, so as to continue to adjust the indoor temperature. At this time, the compressor is controlled to decrease from the current operating frequency to the second reversing frequency that allows the four-way valve to reversing, so that the four-way valve can be reversed, converted to cooling mode, and the indoor fan is controlled to start running. temperature, determine the second operating frequency of the compressor, and then control the compressor to run at the second operating frequency and control the on-off valve to close. In this way, the refrigerant flows in the normal cooling mode. So far, the oil return operation is over.
当然，退出室内机回油操作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回油操作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，可以在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。再如，可以控制节流装置保持最大开度，由于室内机回油操作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。Of course, the method of exiting the oil return operation of the indoor unit is not limited to the above-mentioned one. Those skilled in the art can freely choose a specific control method on the premise that the air conditioner can be restored to the operating state before entering the oil return operation of the indoor unit. This choice does not depart from the principles of the present application. For example, the air deflector of the indoor unit can send air upwards while the indoor fan is turned on, so as to prevent the user from having a bad user experience when the temperature of the indoor heat exchanger coil is too high when the air conditioner just switches to cooling mode. . As another example, the throttling device can be controlled to maintain the maximum opening. Since the refrigerant circulates between the compressor and the indoor heat exchanger during the oil return operation of the indoor unit, resulting in the lack of refrigerant in the outdoor heat exchanger, the throttling device maintains the maximum opening. temperature, so that the refrigerant quickly fills the outdoor heat exchanger, so as to realize the normal circulation of the refrigerant as soon as possible.
可以看出，通过在制冷模式下计算空调器的持续运行时长达到第一预设时长时的第一高低压比，以及达到第二预设时长的第二高低压比，并判断第二高低压比与第一高低压比之间的第一比值所处的范围，然后基于判断结果选择性地执行室内机回油操作，本申请利用空调器运行时的高低压比来判断室内机是否需要回油操作，当需要回油操作时对室内机执行回油操作，使得室内机内积存的冷冻机油及时回到压缩机中，提高室内机的换热效果，提高压缩机运行稳定性。在回油操作时，通过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，使得冷冻机油随冷媒一起由回收管路直接返回至储液器内部，实现高效回油。It can be seen that by calculating the first high and low pressure ratio when the air conditioner's continuous operation time reaches the first preset time in cooling mode, and the second high and low pressure ratio when it reaches the second preset time, and judging the second high and low pressure The range of the first ratio between the ratio and the first high and low pressure ratio, and then selectively perform the oil return operation of the indoor unit based on the judgment result. This application uses the high and low pressure ratio when the air conditioner is running to judge whether the indoor unit needs to return oil. Oil operation, when the oil return operation is required, the oil return operation is performed on the indoor unit, so that the refrigerating machine oil accumulated in the indoor unit returns to the compressor in time, which improves the heat exchange effect of the indoor unit and improves the operation stability of the compressor. During the oil return operation, by controlling the heat exchanger of the air conditioner to switch to the heating mode, and opening the on-off valve and the throttling device, the rapid flow of high-temperature and high-pressure refrigerant can be used to impact the inside of the coil of the indoor heat exchanger, so that the refrigerating machine oil The refrigerant is directly returned to the inside of the accumulator through the recovery pipeline to achieve efficient oil return.
此外，通过在空调器中设置回收管路，本申请能够在执行室内机回油操作过程中，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，而是直接将冷冻机油带回储液器中进行回收，减少了高温冷媒的流动行程、减少沿程压降，提高室内机回油效果。In addition, by setting the recovery pipeline in the air conditioner, the application can use the recovery pipeline to recover the refrigerating machine oil during the oil return operation of the indoor unit, so that after the high-temperature and high-pressure refrigerant flushes the indoor heat exchanger, Instead of going through the outdoor heat exchanger again, the refrigerating machine oil is directly brought back to the liquid receiver for recovery, which reduces the flow of high-temperature refrigerant, reduces the pressure drop along the way, and improves the oil return effect of the indoor unit.
需要说明的是，上述控制方式仅为本申请的较为优选的实施例，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控制方式进行调整。It should be noted that the above control method is only a preferred embodiment of the present application, and those skilled in the art can adjust the above control method without departing from the principle of the present application.
例如，在一种可替换的实施方式中，虽然上述实施例是结合第一比值与第一阈值和第二阈值比较进行说明的，但是显然本领域技术人员可以对阈值数量进行调整，这种调整并未偏离本申请的原理。比如，第一比值仅与一个阈值进行比较，或者与三个、四个阈值进行比较等。For example, in an alternative implementation, although the above embodiment is described in conjunction with the comparison between the first ratio and the first threshold and the second threshold, it is obvious that those skilled in the art can adjust the number of thresholds. without departing from the principles of the application. For example, the first ratio is only compared with one threshold, or compared with three or four thresholds, and so on.
再如，在一种可替换的实施方式中，上述实施例中在第一比值小于 第一阈值且大于等于第二阈值时的具体操作并非一成不变，本领域技术人员可以在上述控制方法的基础上进行调整，这种调整包括但不限于对回油频率的数量调整、对预设时长的调整、对部分中间过程的步骤删除的调整等。As another example, in an alternative implementation, the specific operations in the above-mentioned embodiment when the first ratio is less than the first threshold and greater than or equal to the second threshold are not static, and those skilled in the art can Make adjustments, such adjustments include but are not limited to adjustments to the quantity of oil return frequency, adjustments to preset duration, adjustments to deletion of steps in some intermediate processes, etc.
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为本申请的室内机回油控制方法的一种可能的实施过程的逻辑图。A possible implementation process of the present application will be described below with reference to FIG. 4 . Wherein, FIG. 4 is a logic diagram of a possible implementation process of the indoor unit oil return control method of the present application.
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后，执行下列操作：As shown in Figure 4, in a possible implementation process, after the air conditioner operates in cooling mode, the following operations are performed:
首先执行步骤S201，在制冷持续运行30min时，分别获取室外换热器的压力P21和室内换热器的压力P11，并计算K1＝P21/P11。First, step S201 is executed, and when the cooling operation continues for 30 minutes, the pressure P21 of the outdoor heat exchanger and the pressure P11 of the indoor heat exchanger are respectively obtained, and K1=P21/P11 is calculated.
接下来执行步骤S203，在制冷持续运行60min时，分别获取室外换热器的压力P22和室内换热器的压力P12，并计算K2＝P22/P12。Next, step S203 is executed. When the cooling operation continues for 60 minutes, the pressure P22 of the outdoor heat exchanger and the pressure P12 of the indoor heat exchanger are obtained respectively, and K2=P22/P12 is calculated.
接下来执行步骤S205，计算K2/K1并判断K2/K1≥1.5是否成立。当判断结果为成立时，执行步骤S231，否则，当判断结果为不成立时，执行步骤S207。Next, step S205 is executed to calculate K2/K1 and determine whether K2/K1≥1.5 holds true. When the judgment result is established, step S231 is executed; otherwise, when the judgment result is not established, step S207 is executed.
S207，进一步判断K2/K1＜1.1是否成立。当判断结果为成立时，执行步骤S209；否则，当判断结果为不成立时，执行步骤S211。S207, further determining whether K2/K1<1.1 is established. When the judgment result is established, step S209 is executed; otherwise, when the judgment result is not established, step S211 is executed.
S209，控制空调器保持当前运行状态。S209, controlling the air conditioner to maintain the current running state.
S211，获取压缩机的运行频率f并判断运行频率f＜f1是否成立。当判断结果为成立时，执行步骤S213；否则，当判断结果为不成立时，执行步骤S221。S211. Obtain the operating frequency f of the compressor and determine whether the operating frequency f<f1 holds true. When the judgment result is established, step S213 is executed; otherwise, when the judgment result is not established, step S221 is executed.
S213，控制压缩机升频至第一回油频率f1并运行10min，然后分别获取室外换热器的压力P23和室内换热器的压力P13，并计算K3＝P23/P13。S213, control the frequency of the compressor to increase to the first oil return frequency f1 and run for 10 minutes, then respectively obtain the pressure P23 of the outdoor heat exchanger and the pressure P13 of the indoor heat exchanger, and calculate K3=P23/P13.
然后执行步骤S215，计算K3/K2并判断1.1≤K3/K2＜1.5是否成立。当判断结果为成立时，执行步骤S217，否则，当判断结果为不成立时，执行步骤S227。Then step S215 is executed to calculate K3/K2 and determine whether 1.1≦K3/K2<1.5 holds true. When the judgment result is established, step S217 is executed; otherwise, when the judgment result is not established, step S227 is executed.
S217，控制压缩机升频至第二回油频率f2并运行10min，然后分别获取室外换热器的压力P24和室内换热器的压力P14，并计算K4＝P24/P14。S217, control the frequency of the compressor to increase to the second oil return frequency f2 and run for 10 minutes, then respectively obtain the pressure P24 of the outdoor heat exchanger and the pressure P14 of the indoor heat exchanger, and calculate K4=P24/P14.
然后执行步骤S219，计算K4/K3并判断1.1≤K4/K3＜1.5是否成立。当判断结果为成立时，执行步骤S231，否则，当判断结果为不成立时，执行步骤S227。Then step S219 is executed to calculate K4/K3 and determine whether 1.1≦K4/K3<1.5 holds true. When the judgment result is true, step S231 is executed; otherwise, when the judgment result is false, step S227 is executed.
S221，判断运行频率f＜f2是否成立。当判断结果为成立时，执行步骤S223；否则，当判断结果为不成立时，执行步骤S227。S221, judging whether the operating frequency f<f2 holds true. When the judgment result is true, execute step S223; otherwise, when the judgment result is false, execute step S227.
S223，控制压缩机升频至第二回油频率f2并运行10min，然后分别获取室外换热器的压力P25和室内换热器的压力P15，并计算K5＝P25/P15。S223, control the frequency of the compressor to increase to the second oil return frequency f2 and run for 10 minutes, then respectively obtain the pressure P25 of the outdoor heat exchanger and the pressure P15 of the indoor heat exchanger, and calculate K5=P25/P15.
然后执行步骤S225，计算K5/K2并判断1.1≤K5/K2＜1.5是否成立。当判断结果为成立时，执行步骤S231，否则，当判断结果为不成立时，执行步骤S227。Then step S225 is executed to calculate K5/K2 and determine whether 1.1≦K5/K2<1.5 holds true. When the judgment result is true, step S231 is executed; otherwise, when the judgment result is false, step S227 is executed.
S227，保持当前运行状态，并且每隔10min分别获取室外换热器的压力和室内换热器的压力，并计算二者的高低压力比。S227. Maintain the current operating state, and acquire the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger every 10 minutes, and calculate the high-low pressure ratio of the two.
S229，计算相邻的两个高低压力比之间的比值Kn+1/Kn并判断Kn+1/Kn≥1.5是否成立。当判断结果为成立时，执行步骤S231，否则，当判断结果为不成立时，返回继续执行步骤S227。S229, calculating the ratio Kn+1/Kn between two adjacent high and low pressure ratios and judging whether Kn+1/Kn≥1.5 is established. When the judgment result is true, execute step S231; otherwise, when the judgment result is false, return to continue to execute step S227.
S231，控制空调器执行室内机回油操作。S231. Control the air conditioner to perform the oil return operation of the indoor unit.
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。Those skilled in the art can understand that the above air conditioner also includes some other known structures, such as a processor, a controller, a memory, etc., wherein 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. These well-known structures are not shown in the figures in order to unnecessarily obscure the embodiments of the present disclosure.
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。In the above embodiment, although the various steps are described according to the above sequence, those skilled in the art can understand that in order to achieve the effect of this embodiment, different steps do not have to be executed in this order, and they can be performed at the same time ( Parallel) execution or execution in reversed order, these simple changes are all within the protection scope of the present application.
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。So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principle of the present application, those skilled in the art can make equivalent changes or substitutions to relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present application.

Claims (10)

  1. 一种室内机回油控制方法，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，所述室内换热器上设置有第一压力传感器，所述室外换热器上设置有第二压力传感器，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，An indoor unit oil return control method applied to an air conditioner, characterized in that 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, The indoor heat exchanger is provided with a first pressure sensor, the outdoor heat exchanger is provided with a second pressure sensor, and the air conditioner also includes a recovery pipeline, one end of which is connected to the outdoor heat exchanger. The outlet of the heater is connected, and the other end of the recovery pipeline is connected with the suction port of the compressor. An on-off valve is arranged on the recovery pipeline, and the on-off valve is a normally closed valve.
    所述控制方法包括：The control methods include:
    制冷模式下，当所述空调器的持续运行时长达到第一预设时长时，计算所述室外换热器的压力与所述室内换热器的压力之间的第一高低压比；In the cooling mode, when the continuous operation time of the air conditioner reaches a first preset time, calculate a first high-low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger;
    当所述空调器的持续运行时长达到第二预设时长时，计算所述室外换热器的压力与所述室内换热器的压力之间的第二高低压比；calculating a second high-low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger when the continuous operation time of the air conditioner reaches a second preset time;
    判断所述第二高低压比与所述第一高低压比之间的第一比值所处的范围；judging the range of the first ratio between the second high-low pressure ratio and the first high-low pressure ratio;
    根据判断结果，选择性地执行室内机回油操作；Selectively execute the oil return operation of the indoor unit according to the judgment result;
    其中，所述第二预设时长大于所述第一预设时长。Wherein, the second preset duration is longer than the first preset duration.
  2. 根据权利要求1所述的室内机回油控制方法，其特征在于，“根据判断结果，选择性地执行室内机回油操作”的步骤进一步包括：The method for controlling the oil return of the indoor unit according to claim 1, wherein the step of "selectively performing the oil return operation of the indoor unit according to the judgment result" further comprises:
    如果所述第一比值大于等于第一阈值，则执行所述室内机回油操作。If the first ratio is greater than or equal to a first threshold, the oil return operation of the indoor unit is performed.
  3. 根据权利要求2所述的室内机回油控制方法，其特征在于，“根据判断结果，选择性地执行室内机回油操作”的步骤进一步包括：The method for controlling the oil return of the indoor unit according to claim 2, wherein the step of "selectively performing the oil return operation of the indoor unit according to the judgment result" further comprises:
    如果所述第一比值小于所述第一阈值且大于等于第二阈值，则获取所述压缩机的第一运行频率；If the first ratio is smaller than the first threshold and greater than or equal to a second threshold, then obtain the first operating frequency of the compressor;
    判断所述第一运行频率与第一回油频率的大小；Judging the magnitude of the first operating frequency and the first oil return frequency;
    如果所述第一运行频率小于所述第一回油频率，则控制所述压缩机升频至所述第一回油频率运行；If the first operating frequency is lower than the first oil return frequency, control the compressor to increase the frequency to operate at the first oil return frequency;
    当所述压缩机以所述第一回油频率持续运行第三预设时长时，计算所述室外换热器的压力与所述室内换热器的压力之间的第三高低压比；calculating a third high/low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger when the compressor continues to operate at the first oil return frequency for a third preset time;
    判断所述第三高低压比与所述第二高低压比之间的第二比值所处的范围；judging the range of the second ratio between the third high-low pressure ratio and the second high-low pressure ratio;
    根据判断结果，选择性地执行所述室内机回油操作。According to the judgment result, the oil return operation of the indoor unit is selectively performed.
  4. 根据权利要求3所述的室内机回油控制方法，其特征在于，“根据判断结果，选择性地执行所述室内机回油操作”的步骤进一步包括：The method for controlling the oil return of the indoor unit according to claim 3, wherein the step of "selectively performing the oil return operation of the indoor unit according to the judgment result" further comprises:
    如果所述第二比值小于所述第一阈值且大于等于所述第二阈值，则控制所述压缩机升频至第二回油频率运行；If the second ratio is less than the first threshold and greater than or equal to the second threshold, control the compressor to increase the frequency to run at the second oil return frequency;
    当所述压缩机以所述第二回油频率持续运行第四预设时长时，计算所述室外换热器的压力与所述室内换热器的压力之间的第四高低压比；calculating a fourth high/low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger when the compressor continues to operate for a fourth preset time at the second oil return frequency;
    判断所述第四高低压比与所述第三高低压比之间的第三比值所处的范围；judging the range of the third ratio between the fourth high-low pressure ratio and the third high-low pressure ratio;
    根据判断结果，选择性地执行所述室内机回油操作；并且/或者According to the judgment result, selectively execute the oil return operation of the indoor unit; and/or
    如果所述第二比值小于所述第二阈值，则控制所述空调器保持当前运行状态，直至先后两次计算出的高低压比之间的比值大于等于所述第一阈值时再执行所述室内机回油操作。If the second ratio is smaller than the second threshold, control the air conditioner to maintain the current operating state until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold and then execute the Indoor unit oil return operation.
  5. 根据权利要求4所述的室内机回油控制方法，其特征在于，“根据判断结果，选择性地执行所述室内机回油操作”的步骤进一步包括：The method for controlling the oil return of the indoor unit according to claim 4, wherein the step of "selectively performing the oil return operation of the indoor unit according to the judgment result" further comprises:
    如果所述第三比值小于所述第一阈值且大于等于所述第二阈值，则执行所述室内机回油操作；并且/或者If the third ratio is smaller than the first threshold and greater than or equal to the second threshold, perform the oil return operation of the indoor unit; and/or
    如果所述第三比值小于所述第二阈值，则控制所述空调器保持当前运行状态，直至先后两次计算出的高低压比之间的比值大于等于所述第一阈值时再执行所述室内机回油操作。If the third ratio is smaller than the second threshold, control the air conditioner to maintain the current operating state until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold and then execute the Indoor unit oil return operation.
  6. 根据权利要求4所述的室内机回油控制方法，其特征在于，所述控制方法还包括：The oil return control method of the indoor unit according to claim 4, wherein the control method further comprises:
    如果所述第一运行频率大于等于所述第一回油频率，则进一步判断所述第一运行频率与所述第二回油频率的大小；If the first operating frequency is greater than or equal to the first oil return frequency, further judge the magnitude of the first operating frequency and the second oil return frequency;
    如果所述第一运行频率小于所述第二回油频率，则控制所述压缩机升频至第二回油频率运行；If the first operating frequency is lower than the second oil return frequency, control the compressor to increase the frequency to run at the second oil return frequency;
    当所述压缩机以所述第二回油频率持续运行第五预设时长时，计算所述室外换热器的压力与所述室内换热器的压力之间的第五高低压比；calculating a fifth high and low pressure ratio between the pressure of the outdoor heat exchanger and the pressure of the indoor heat exchanger when the compressor continues to run for a fifth preset time at the second oil return frequency;
    判断所述第五高低压比与所述第二高低压比之间的第四比值所处的范围；Judging the range of the fourth ratio between the fifth high and low pressure ratio and the second high and low pressure ratio;
    根据判断结果，选择性地执行所述室内机回油操作；并且/或者According to the judgment result, selectively execute the oil return operation of the indoor unit; and/or
    如果所述第一运行频率大于等于所述第二回油频率，则控制空调器保持当前运行状态，直至先后两次计算出的高低压比之间的比值大于等于所述第一阈值时再执行室内机回油操作。If the first operating frequency is greater than or equal to the second oil return frequency, control the air conditioner to maintain the current operating state until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold value and then execute Indoor unit oil return operation.
  7. 根据权利要求6所述的室内机回油控制方法，其特征在于，“根据判断结果，选择性地执行所述室内机回油操作”的步骤进一步包括：The method for controlling the oil return of the indoor unit according to claim 6, wherein the step of "selectively performing the oil return operation of the indoor unit according to the judgment result" further comprises:
    如果所述第四比值小于所述第一阈值且大于等于所述第二阈值，则执行所述室内机回油操作；并且/或者If the fourth ratio is smaller than the first threshold and greater than or equal to the second threshold, perform the oil return operation of the indoor unit; and/or
    如果所述第四比值小于所述第二阈值，则控制所述空调器保持当前运行状态，直至先后两次计算出的高低压比之间的比值大于等于所述第一阈值时再执行所述室内机回油操作。If the fourth ratio is smaller than the second threshold, control the air conditioner to maintain the current operating state until the ratio between the high and low pressure ratios calculated twice successively is greater than or equal to the first threshold and then execute the Indoor unit oil return operation.
  8. 根据权利要求1所述的室内机回油控制方法，其特征在于，“根据判断结果，选择性地执行室内机回油操作”的步骤进一步包括：The method for controlling the oil return of the indoor unit according to claim 1, wherein the step of "selectively performing the oil return operation of the indoor unit according to the judgment result" further comprises:
    如果所述第一比值小于第二阈值，则不执行所述室内机回油操作，控制所述空调器保持当前运行状态。If the first ratio is smaller than the second threshold, the oil return operation of the indoor unit is not performed, and the air conditioner is controlled to maintain the current operating state.
  9. 根据权利要求1所述的室内机回油控制方法，其特征在于，“执行室内机回油操作”的步骤进一步包括：The indoor unit oil return control method according to claim 1, wherein the step of "executing the indoor unit oil return operation" further comprises:
    控制所述压缩机降频至第一换向频率；controlling the frequency reduction of the compressor to the first commutation frequency;
    控制所述四通阀换向，以转换成制热模式；Control the reversing of the four-way valve to switch to the heating mode;
    在所述四通阀换向后，控制室内风机继续运行第六预设时长后关闭；After the four-way valve is reversed, the fan in the control room continues to run for a sixth preset time and then shuts down;
    控制所述压缩机升频至第三回油频率；controlling the frequency of the compressor to increase to the third oil return frequency;
    控制所述通断阀打开，所述节流装置打开至最大开度。The on-off valve is controlled to open, and the throttling device is opened to a maximum opening.
  10. 根据权利要求9所述的室内机回油控制方法，其特征在于，在“控制所述通断阀打开，所述节流装置打开至最大开度”的步骤之后，所述控制方法还包括：The oil return control method of an indoor unit according to claim 9, wherein after the step of "controlling the on-off valve to open and the throttle device to open to the maximum opening degree", the control method further includes:
    在所述通断阀打开并持续第第七预设时长后，控制所述压缩机降频至第二换向频率；After the on-off valve is opened for a seventh preset period of time, controlling the frequency of the compressor to decrease to the second reversing frequency;
    控制所述四通阀换向，以转换成制冷模式；Control the reversing of the four-way valve to switch to the refrigeration mode;
    控制所述室内风机启动运行；controlling the indoor fan to start running;
    基于设定温度确定第二运行频率，并控制所述压缩机按照所述第二运行频率运行；determining a second operating frequency based on the set temperature, and controlling the compressor to operate at the second operating frequency;
    控制所述通断阀关闭。Control the on-off valve to close.
PCT/CN2021/129819 2021-07-09 2021-11-10 Indoor unit oil return control method WO2023279616A1 (en)

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