WO2024040915A1 - Climatiseur - Google Patents

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Publication number
WO2024040915A1
WO2024040915A1 PCT/CN2023/079666 CN2023079666W WO2024040915A1 WO 2024040915 A1 WO2024040915 A1 WO 2024040915A1 CN 2023079666 W CN2023079666 W CN 2023079666W WO 2024040915 A1 WO2024040915 A1 WO 2024040915A1
Authority
WO
WIPO (PCT)
Prior art keywords
electronic expansion
expansion valve
opening
air conditioner
indoor
Prior art date
Application number
PCT/CN2023/079666
Other languages
English (en)
Chinese (zh)
Inventor
高文栋
王庆杰
司理涛
Original Assignee
青岛海信日立空调系统有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN202211008849.4A external-priority patent/CN115342476A/zh
Priority claimed from CN202222221157.XU external-priority patent/CN218154729U/zh
Priority claimed from CN202211015066.9A external-priority patent/CN115388512A/zh
Application filed by 青岛海信日立空调系统有限公司 filed Critical 青岛海信日立空调系统有限公司
Publication of WO2024040915A1 publication Critical patent/WO2024040915A1/fr

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Classifications

    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise

Definitions

  • the present disclosure relates to the technical field of household appliances, and in particular to an air conditioner.
  • multi-split air conditioning systems With the improvement of living standards, multi-split air conditioning systems have gradually entered thousands of households. In addition to requiring multi-split air conditioning systems to have good cooling and heating effects, users are also concerned about the comfort of multi-split air conditioning systems. Noise improvement is an important aspect to improve the comfort of multi-split air conditioning systems.
  • the multi-split air conditioning system includes an outdoor unit and multiple indoor units.
  • the outdoor unit and multiple indoor units are equipped with electronic expansion valves for regulating the flow of refrigerant in the pipelines.
  • an air conditioner includes: an outdoor unit, at least one indoor unit, an electronic expansion valve and a controller.
  • the outdoor unit includes: a compressor, an outdoor heat exchanger and an indoor heat exchanger.
  • the compressor is configured to compress the refrigerant to drive the refrigerant to circulate in the air conditioner;
  • the outdoor heat exchanger is configured to liquefy or vaporize the refrigerant;
  • the indoor unit is connected to the outdoor unit, and each indoor unit includes an indoor heat exchanger.
  • the indoor heat exchanger is configured to liquefy or vaporize the refrigerant.
  • the electronic expansion valve is connected to the indoor heat exchanger and the outdoor heat exchanger respectively, and is configured to regulate the flow of refrigerant flowing between the outdoor heat exchanger and the indoor heat exchanger.
  • the controller is configured to: read the temperature difference, which is the difference between the temperature of the middle part of the indoor heat exchanger and the outlet temperature; and determine the temperature of the electronic expansion valve according to the temperature difference.
  • Degree of subcooling calculate the difference in subcooling, which is the difference between the degree of subcooling and the set value of subcooling; determine the electronic expansion valve according to the difference in subcooling the target opening; adjust the opening of the electronic expansion valve to the target opening to reduce the proportion of gas-phase refrigerant and reduce the refrigerant flow noise.
  • an air conditioner in another aspect, includes an outdoor unit, at least one indoor unit, an electronic expansion valve, a regulating device and a controller.
  • the outdoor unit includes a compressor, an outdoor heat exchanger and an indoor heat exchanger; the compressor is configured to compress refrigerant to drive the refrigerant to circulate in the air conditioner.
  • the outdoor heat exchanger is configured to one of liquefy or vaporize the refrigerant.
  • the at least one indoor unit is connected to the outdoor unit, and each indoor unit includes an indoor heat exchanger configured to one of liquefy or vaporize the refrigerant.
  • the electronic expansion valve is connected to the indoor heat exchanger and the outdoor heat exchanger, and is configured to regulate the flow of refrigerant flowing between the outdoor heat exchanger and the indoor heat exchanger.
  • the regulating device is connected to the electronic expansion valve and is configured to reduce the impact of the gas phase refrigerant on the electronic expansion valve to reduce refrigerant flow noise.
  • the regulating device includes a bypass pipe and a one-way valve.
  • the bypass pipe is arranged on one side of the inlet pipe of the electronic expansion valve, and the first end of the bypass pipe is connected to the inlet pipe, and the second end of the bypass pipe is connected to the electronic expansion valve. Valve body connection.
  • the one-way valve is provided on the bypass pipe, and the one-way valve is configured to provide one-way communication in the direction from the inlet pipe to the valve body through the bypass pipe.
  • the controller is configured to respond to the mode control instruction, read the operating mode carried by the mode control instruction, and open the one-way valve if the operating mode is the heating mode.
  • Figure 1 is a structural diagram of an air conditioner according to some embodiments.
  • Figure 2 is a structural diagram of another air conditioner according to some embodiments.
  • Figure 3 is a flow chart of a control method for reducing refrigerant flow noise of an indoor electronic expansion valve according to some embodiments
  • Figure 4 is a structural diagram of an indoor heat exchanger according to some embodiments.
  • Figure 5 is a refrigerant pressure-enthalpy diagram according to some embodiments.
  • Figure 6 is a flow chart of an indoor electronic expansion valve control method according to some embodiments.
  • Figure 7 is a flow chart of another indoor electronic expansion valve control method according to some embodiments.
  • Figure 8 is a flow chart of yet another indoor electronic expansion valve control method according to some embodiments.
  • Figure 9 is a structural block diagram of an indoor electronic expansion valve control device according to some embodiments.
  • Figure 10 is a structural diagram of yet another air conditioner according to some embodiments.
  • Figure 11 is a structural diagram of a refrigerant system according to some embodiments.
  • Figure 12 is a structural diagram of an adjustment device according to some embodiments.
  • Figure 13 is a flow chart of a control method of an adjustment device according to some embodiments.
  • Figure 14 is a flow chart of another control method of an adjustment device according to some embodiments.
  • Figure 15 is a flow chart of yet another control method of an adjustment device according to some embodiments.
  • Figure 16 is a flow chart of yet another control method of an adjustment device according to some embodiments.
  • Figure 17 is a structural diagram of a controller according to some embodiments.
  • first and second are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. or an implicit indication of the quantity of the technical feature indicated. Therefore, features defined as “first” and “second” may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, “plurality” means two or more.
  • At least one of A, B and C has the same meaning as “at least one of A, B or C” and includes the following combinations of A, B and C: A only, B only, C only, A and B The combination of A and C, the combination of B and C, and the combination of A, B and C.
  • a and/or B includes the following three combinations: A only, B only, and a combination of A and B.
  • FIG. 1 is a structural diagram of an air conditioner according to some embodiments
  • Figure 2 is another structural diagram of an air conditioner according to some embodiments.
  • the air conditioner 1000 includes a compressor 110, an outdoor heat exchanger 120, an indoor heat exchanger 210, an expansion valve 300, a four-way reversing valve 400, a stop valve 500, a fan 600 and a gas-liquid separator 700.
  • the air conditioner 1000 includes four operating modes, which are heating mode, cooling mode, dehumidification mode and air supply mode.
  • the heating mode indicates that the air conditioner 1000 heats the indoor environment
  • the cooling mode indicates that the air conditioner 1000 cools the indoor environment.
  • the dehumidification mode means that the air conditioner 1000 dehumidifies the indoor ambient temperature.
  • the air supply mode means that the air conditioner 1000 increases indoor air flow and has no obvious cooling or heating effect on the indoor environment. It should be noted that in some embodiments, the air conditioner 1000 may also include other operating modes, such as a cooling and dehumidification mode, which is not limited by the present disclosure.
  • Air conditioner 1000 includes an outdoor unit 100 and an indoor unit 200 .
  • the outdoor unit 100 of the air conditioner 1000 includes a compressor 110 and an outdoor heat exchanger 120
  • the indoor unit 200 of the air conditioner 1000 includes an indoor heat exchanger 210 .
  • the air conditioner 1000 further includes an expansion valve 300, and at least one of the outdoor unit 100 or the indoor unit 200 is provided with the expansion valve 300.
  • the compressor 110, the condenser (indoor heat exchanger 210 or outdoor heat exchanger 120), the expansion valve 300, and the evaporator (outdoor heat exchanger 120 or indoor heat exchanger 210) execute the refrigerant cycle of the air conditioner 1000.
  • the refrigerant cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the regulated side cycle.
  • the indoor heat exchanger 210 is configured to one of liquefy or vaporize the refrigerant by exchanging heat between the indoor air and the refrigerant transported in the indoor heat exchanger 210 .
  • the outdoor heat exchanger 120 is configured to one of liquefy or vaporize the refrigerant by exchanging heat with outdoor air and the refrigerant transported in the outdoor heat exchanger 120 .
  • the indoor heat exchanger 210 works as an evaporator when the air conditioner 1000 operates in the cooling mode, so that the refrigerant that has been dissipated through the outdoor heat exchanger 120 absorbs heat from the indoor air through the indoor heat exchanger 210 and evaporates.
  • the indoor heat exchanger 210 works as a condenser in the heating mode of the air conditioner 1000, so that the refrigerant that has absorbed heat through the outdoor heat exchanger 210 dissipates heat to the indoor air through the indoor heat exchanger 210 to be condensed.
  • the expansion valve 300 may be an electronic valve connected between the outdoor heat exchanger 120 and the indoor heat exchanger 210 .
  • the expansion valve 300 includes an outdoor electronic expansion valve (outdoor machine electronic expansion valve, EVO) 310 and an indoor electronic expansion valve (indoor machine electronic expansion valve, EVI) 320.
  • the opening of the electronic expansion valve 300 adjusts the pressure of the refrigerant flowing through the outdoor heat exchanger 120 and the indoor heat exchanger 210 to adjust the pressure of the refrigerant flowing through the outdoor heat exchanger 120 and the indoor heat exchanger. refrigerant flow between heaters 210.
  • the flow rate and pressure of the refrigerant flowing between the outdoor heat exchanger 120 and the indoor heat exchanger 210 will affect the heat exchange performance of the outdoor heat exchanger 120 and the indoor heat exchanger 210 .
  • the opening of the electronic expansion valve 300 is adjustable to control the flow rate and pressure of the refrigerant flowing through the electronic expansion valve 300 .
  • the opening degree of the electronic expansion valve 300 is reduced, the flow path resistance of the refrigerant passing through the electronic expansion valve 300 increases; when the opening degree of the electronic expansion valve 300 is increased, the flow path resistance of the refrigerant passing through the electronic expansion valve 300 is increased. decrease. In this way, even if the status of other components of the air conditioner 1000 does not change, when the opening of the electronic expansion valve 300 changes, the refrigerant flow rate flowing to the indoor heat exchanger 210 or the outdoor heat exchanger 120 will also change.
  • the compressor 110 compresses the gas-phase refrigerant in a low-temperature and low-pressure state and discharges the compressed high-temperature and high-pressure gas-phase refrigerant.
  • the high-temperature and high-pressure gas phase refrigerant flows into the condenser.
  • the condenser condenses the high-temperature and high-pressure gas phase refrigerant into a high-pressure liquid phase refrigerant, and the heat is released to the surrounding environment along with the condensation process.
  • the expansion valve 300 expands a high-pressure liquid refrigerant into a low-pressure gas-liquid two-phase refrigerant.
  • the evaporator absorbs heat from the surrounding environment and evaporates the low-pressure gas-liquid two-phase refrigerant to form a low-temperature and low-pressure gas-phase refrigerant.
  • the low-temperature and low-pressure gas phase refrigerant returns to the compressor 110 .
  • the evaporation temperature of the outdoor heat exchanger 210 is Te
  • the exhaust pressure of the compressor 110 is Pd
  • the exhaust temperature is Td
  • the suction pressure is Ps
  • the suction temperature for Ts is Te
  • the compressor 110 may be a variable capacity compressor with inverter-based speed control.
  • the four-way reversing valve 400 includes four ports, which are a first port C, a second port D, a third port S, and a fourth port E.
  • the first port C is connected to the outdoor heat exchanger 120 and the second port.
  • D is connected to the exhaust port 111 of the compressor 110
  • the third port S is connected to the gas-liquid separator 700
  • the fourth port E is connected to the indoor heat exchanger 210.
  • the four-way reversing valve 400 realizes mutual conversion of the air conditioner 1000 between the cooling mode and the heating mode by changing the flow direction of the refrigerant in the system pipeline.
  • the stop valve 500 includes a liquid side stop valve 501 and a gas side stop valve 502 .
  • the liquid side stop valve 501 is provided between the outdoor electronic expansion valve 310 and the indoor unit electronic expansion valve 320, and is configured to control the flow rate of the liquid phase refrigerant that has been condensed by the condenser and circulates in the pipeline.
  • the gas-side stop valve 502 is provided between the compressor 110 and the indoor heat exchanger 210, and is configured to control the flow rate of the gas-phase refrigerant that has been evaporated by the evaporator and circulates in the pipeline.
  • the fan 600 includes an outdoor fan 601 and an indoor fan 602.
  • the outdoor fan 601 is configured to promote heat exchange between the refrigerant flowing in the heat transfer tube of the outdoor heat exchanger 120 and the outdoor air
  • the indoor fan 602 is configured to promote the heat exchange between the refrigerant flowing in the heat transfer tube of the indoor heat exchanger 210 and the indoor air. Heat exchange of air to assist in temperature regulation.
  • the gas-liquid separator 700 is configured to filter the liquid phase refrigerant that has not been completely evaporated in the gas phase refrigerant returned to the compressor 110 .
  • the air conditioner 1000 further includes a controller 91 .
  • the controller 91 is coupled to the compressor 110 , the four-way valve 400 , the outdoor fan 601 and the outdoor electronic expansion valve 310 in the outdoor unit 100 , and is coupled to the indoor fan 602 and the indoor electronic expansion valve 320 in the indoor unit 200 .
  • the controller 91 is configured to control the working status of each component coupled to the controller 91 .
  • Controller 91 includes a processor.
  • the processor may include a central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), and may be configured such that when the processor executes storage coupled to the controller 91 When the program in the non-transitory computer-readable medium is read, the corresponding operations described in the controller 91 are performed.
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • the multi-split air conditioner 1000 includes one outdoor unit 100 and at least one indoor unit 200.
  • the air conditioner 1000 includes one outdoor unit 100 and two indoor units 200.
  • FIG. 1 shows an application scenario in which the air conditioner 1000 includes one outdoor unit electronic expansion valve 310 and two indoor electronic expansion valves 320.
  • the number of the outdoor unit electronic expansion valve 310 and the indoor electronic expansion valve 320 can be set according to requirements. , this disclosure does not limit this.
  • the outdoor unit 100 can use air-cooling heat exchange to adjust the temperature
  • the indoor unit 200 can use evaporative heat exchange to adjust the temperature. This disclosure does not limit the temperature adjustment form of the outdoor unit 100 or the indoor unit 200 .
  • the air conditioner 1000 further includes a remote control having a function of communicating with the controller 91 using, for example, infrared rays.
  • the user can control the air conditioner 1000 through the remote control to realize interaction between the user and the air conditioner 1000.
  • the refrigerant may be in a gas-liquid two-phase state when flowing through the electronic expansion valve 300.
  • the gas-liquid two-phase refrigerant refers to a mixture of gas-phase refrigerant and liquid-phase refrigerant. Since the electronic expansion valve 300 is a throttling and pressure reducing component, when the gas-liquid two-phase When the refrigerant flows through the electronic expansion valve 300, the cross-sectional area through which the refrigerant passes suddenly becomes smaller. The liquid phase refrigerant in the gas-liquid two-phase refrigerant passes through the expansion part of the electronic expansion valve 300 and becomes a gas phase refrigerant.
  • the opening of the electronic expansion valve 300 is usually adjusted based on experience or according to the power of the compressor 110 .
  • adjusting the opening of the electronic expansion valve 300 based on experience cannot cope with frequent mode changes.
  • the indoor unit 200 performs frequent mode changes, the refrigerant flowing through the electronic expansion valve 300 will Intermittent refrigerant flow sound is produced.
  • the sound of refrigerant flow is mostly high-frequency noise or intermittent noise, and users are very sensitive to high-frequency and intermittent noise.
  • some embodiments of the present disclosure provide a control method for the indoor electronic expansion valve 320 .
  • the proportion of gas phase refrigerant in the refrigerant flowing through the electronic expansion valve 300 is reduced.
  • Figure 3 is a flow chart of a control method for reducing refrigerant flow noise of an indoor electronic expansion valve according to some embodiments
  • Figure 4 is a structural diagram of an indoor heat exchanger according to some embodiments.
  • control method is applied to the controller 91 and includes steps S101 to S105.
  • Step S101 Read the temperature difference X between the temperature at the middle part of the indoor unit heat exchanger 210 and the outlet temperature.
  • the middle part of the indoor heat exchanger 210 is a position close to the center of the indoor heat exchanger 210.
  • the indoor heat exchanger 210 includes an outlet pipe 211 and an inlet pipe 212 .
  • the air conditioner 1000 also includes a plurality of temperature sensors 20, such as a first temperature sensor 21 and a second temperature sensor 22.
  • the first temperature sensor 21 is disposed near the center of the indoor heat exchanger 210 and is configured to collect data from the indoor heat exchanger.
  • the temperature of the middle part is 210 TC.
  • the second temperature sensor 22 is provided at the outlet pipe 211 of the indoor heat exchanger 210 and is configured to collect the outlet temperature TL.
  • Step S102 determine the subcooling degree of the indoor electronic expansion valve 320 according to the temperature difference value X.
  • the degree of under cooling refers to the difference between the temperature of the refrigerant under a certain pressure and the corresponding saturation temperature when the temperature of the refrigerant under a certain pressure is lower than the saturation temperature under the corresponding pressure.
  • Figure 5 is a refrigerant pressure-enthalpy diagram according to some embodiments. As shown in Figure 5, the ordinate of the pressure-enthalpy diagram is the pressure P, the unit is Pa (Pa), the abscissa is the specific enthalpy value H, and the specific enthalpy value H refers to 1kg Enthalpy value of a certain substance, unit (kj/kg).
  • the refrigerant high-pressure saturated liquid can be a liquid-phase refrigerant or a gas-liquid two-phase refrigerant.
  • the temperature TC in the middle of the indoor heat exchanger 210 is used as the temperature T6 of the refrigerant high-pressure saturated liquid, and the detection at the outlet pipe 211 of the indoor heat exchanger 210 is selected.
  • the temperature TL is taken as the condenser outlet temperature T2.
  • SC subcooling degree of the indoor electronic expansion valve 320
  • Step S103 Calculate the subcooling degree difference ⁇ SC.
  • the subcooling degree difference ⁇ SC is the difference between the subcooling degree SC and the subcooling degree set value SC set .
  • ⁇ SC SC-SC set .
  • the subcooling degree set value SC set is preset by the system and can be set according to needs.
  • the subcooling degree set value SC set satisfies: 0°C ⁇ SC set ⁇ 20°C, for example, SC set (1°C ⁇ 5°C). It can be 1°C, 5°C, 10°C or 15°C, etc.
  • Step S104 determine the target opening EVI (N+1) of the indoor electronic expansion valve 320 based on the subcooling degree difference ⁇ SC.
  • the controller 91 of the air conditioner 1000 also includes a memory 92 , and the corresponding relationship between the subcooling degree difference ⁇ SC and the opening of the indoor electronic expansion valve 320 can be stored in the memory 92 in advance. . After the controller 91 completes the calculation of the subcooling degree difference ⁇ SC, the controller 91 retrieves the target opening EVI (N+1) according to the corresponding relationship between the stored subcooling degree difference ⁇ SC and the opening of the indoor electronic expansion valve 300 ).
  • Step S105 adjust the indoor electronic expansion valve 320 to the target opening EVI(N+1).
  • the controller 91 adjusts the opening of the indoor electronic expansion valve 320 according to the retrieved target opening EVI(N+1), thereby The indoor electronic expansion valve 320 is adjusted to the target opening EVI (N+1).
  • the proportion of gas-phase refrigerant in the indoor electronic expansion valve 320 can basically reach less than 30% or more than 70%. , In this way, it is helpful to control the proportion of gas phase refrigerant, thereby reducing the refrigerant flow noise.
  • FIG. 6 is a flow chart of an indoor electronic expansion valve control method according to some embodiments
  • FIG. 7 is a flow chart of another indoor electronic expansion valve control method according to some embodiments.
  • the controller 91 before step S101, the controller 91 also needs to perform step S100.
  • Step S100 Read the status of the indoor unit 200.
  • the indoor unit 200 includes an operating state and a non-operating state.
  • the operating state of the indoor unit 200 refers to the state when the indoor unit 200 is turned on and running, and the non-operating state of the indoor unit 200 refers to the shutdown state or standby state of the indoor unit 200 .
  • the controller 91 may adjust the opening of the indoor electronic expansion valve 320 to the initial value.
  • EVI02 is an initial value corresponding to the opening of the indoor electronic expansion valve 320 when the indoor unit 200 is in operation.
  • EVI0 is an initial value corresponding to the opening of the indoor electronic expansion valve 320 when the indoor unit 200 is in a non-operating state.
  • EVI(N) is the current opening of the indoor electronic expansion valve 320 .
  • EVI0 and EVI02 can be set according to needs.
  • EVI0 and EVI02 can be set according to the capacity of the air conditioner 1000 or the number of indoor units 200.
  • the values of EVI0 and EVI02 are positive to the capacity of the air conditioner 1000 or the number of indoor units 200.
  • step S104 includes steps S200 to S204.
  • Step S201 Determine whether the subcooling degree difference ⁇ SC is less than or equal to the first subcooling degree value G1. If yes, step S202 is executed. If not, step S203 is executed.
  • the first subcooling value G1 can be set according to requirements.
  • G1 can be 3°C, 5°C, or 6°C.
  • EVI(N+1) is the target opening of the indoor electronic expansion valve 320
  • ⁇ EVI is the opening variation of the indoor electronic expansion valve 320, which can be set according to requirements, and is not limited in this disclosure.
  • Step S202 Determine whether the subcooling degree difference ⁇ SC is greater than zero. If yes, step S2021 is executed. If not, step S2022 is executed.
  • the controller 91 needs to determine whether the subcooling difference ⁇ SC is greater than zero.
  • Step S2021 Keep the opening of the indoor electronic expansion valve 320 unchanged.
  • the controller 91 ensures the temperature-regulating efficiency of the air conditioner 1000 by keeping the opening of the indoor electronic expansion valve 320 constant.
  • Step S2022 reduce the opening of the indoor electronic expansion valve 320.
  • the controller 91 reduces the opening of the indoor electronic expansion valve 320 to reduce the refrigerant flow sound.
  • Step S203 Increase the opening of the indoor electronic expansion valve 320.
  • the controller 91 reduces the refrigerant flow noise by increasing the opening of the indoor electronic expansion valve 320 .
  • step S204 the controller 91 controls the opening of the indoor electronic expansion valve 320 to be adjusted and makes the indoor electronic expansion valve 320 operate stably according to the adjusted target opening EVI (N+1).
  • Step S204 End this adjustment process.
  • step S104 may include steps S300 to S304.
  • Step S301 Determine whether the subcooling degree difference ⁇ SC is less than or equal to the second subcooling degree value G2. If yes, step S302 is executed. If not, step S303 is executed.
  • the second subcooling value G2 can be set according to requirements.
  • G2 can be 5°C, 6°C or 10°C.
  • the indoor fan 602 when the indoor unit 200 is in the non-operating state, the indoor fan 602 is turned off and the indoor heat exchanger 210 cannot perform effective heat exchange. Therefore, when the indoor unit 200 is in the non-operating state, the corresponding second The subcooling degree value G2 is greater than the corresponding first subcooling degree value G1 when the indoor unit 200 is in the operating state.
  • Step S302 reduce the opening of the indoor electronic expansion valve 320.
  • the controller 91 reduces the opening of the indoor electronic expansion valve 320 to reduce the refrigerant flow sound.
  • Step S303 Keep the opening of the indoor electronic expansion valve 320 unchanged.
  • the controller 91 ensures the temperature-regulating efficiency of the air conditioner 1000 by keeping the opening of the indoor electronic expansion valve 320 constant.
  • step S304 is executed.
  • Step S304 End this adjustment process.
  • the controller 91 can re-read the temperature difference X every predetermined time interval T (such as 20 s), and adjust the opening of the indoor electronic expansion valve 320 in time according to the temperature difference X. In this way, refrigerant flow sound caused by refrigerant with a small degree of subcooling flowing through the indoor electronic expansion valve 320 can be avoided.
  • predetermined time T the more significant the effect of the air conditioner 1000 in reducing the refrigerant flow sound.
  • a shorter predetermined time T will increase the calculation amount of the controller 91 accordingly.
  • FIG 8 is a flow chart of yet another indoor electronic expansion valve control method according to some embodiments.
  • the frequency of the compressor 110 needs to be adjusted.
  • the frequency of the compressor 110 changes, and the refrigerant pressure in the system of the air conditioner 1000 changes accordingly, resulting in a degree of subcooling. SC changes, thereby affecting the opening of the indoor unit electronic expansion valve 320. Therefore, when receiving the instruction to adjust the frequency of the compressor 110, the controller 91 executes steps S400 to S404.
  • Step S400 A frequency adjustment instruction from the compressor 21 is received.
  • Step S401 Compare whether the current operating frequency Ft of the compressor 110 is less than the target frequency Fn. If yes, execute step S402; if not, execute step S403.
  • Step S402 Increase the opening of the indoor electronic expansion valve 320 to the target opening EVI(N+1).
  • EVI(N+1) EVI(N)+ ⁇ EVI.
  • Step S4021 increase the frequency of the compressor 110 to the target frequency Fn.
  • Step S403 reduce the compressor frequency to the target frequency Fn.
  • EVI(N+1) EVI(N)- ⁇ EVI.
  • Step S4031 reduce the opening of the indoor electronic expansion valve 320 to the target opening.
  • Step S404 End this adjustment process.
  • Figure 9 is a structural block diagram of an indoor electronic expansion valve control device according to some embodiments.
  • the controller 91 includes: a reading component 81 configured to read the temperature difference, or configured to pressure
  • the compressor operating frequency is the target frequency
  • the temperature difference is the difference between the temperature at the middle part of the indoor unit heat exchanger and the outlet temperature
  • the retrieval component 82 is used to retrieve the subcooling of the indoor electronic expansion valve 320 corresponding to the temperature difference. degree
  • the calculation component 83 is used to calculate the subcooling degree difference, which is the difference between the subcooling degree and the subcooling degree set value
  • the determination component 84 is used to determine the indoor electronic expansion based on the subcooling degree difference.
  • the target opening of the valve 320; the adjustment component 85 adjusts the opening of the indoor electronic expansion valve 320 to the target opening.
  • FIG. 10 is a structural diagram of another air conditioner according to some embodiments
  • FIG. 11 is a structural diagram of a refrigerant system according to some embodiments
  • FIG. 12 is a structural diagram of an adjustment device according to some embodiments.
  • the valve needle 36 is in a vertical direction.
  • the refrigerant flows from the inlet pipe 32 into the indoor electronic expansion valve 320, it will directly hit the top of the valve needle 36.
  • the valve needle 36 is subject to the excitation force of the gas phase refrigerant, causing the valve needle 36 to tremble. And it radiates high-frequency noise, causing the valve needle 36 to vibrate and produce refrigerant flow sound.
  • the refrigerant flows in the opposite direction (the direction pointed by the dotted arrow in Figure 12).
  • the refrigerant flows from the outlet pipe 33 of the indoor electronic expansion valve 320 to the inlet pipe 32.
  • the refrigerant acts vertically on the side of the valve needle 36, causing The excitation force is small, and it is difficult for the valve needle 36 to vibrate and thereby produce refrigerant flow sound. Therefore, refrigerant flow noise is usually easily produced in heating mode.
  • the air conditioner 1000 further includes an adjustment device 30, and the adjustment device 30 is configured In the heating mode, the impact of the gas-phase refrigerant on the valve needle 36 is reduced, and the excitation force on the valve needle 36 is reduced, thereby reducing the noise of the valve needle 36 .
  • the indoor electronic expansion valve 320 includes a valve body 31 , an inlet pipe 32 , an outlet pipe 33 and a valve needle 36 .
  • the inlet pipe 32 is connected to the indoor heat exchanger 210
  • the outlet pipe 33 is connected to the outdoor heat exchanger 120
  • the valve needle 36 is arranged in the valve body 31 .
  • the regulating device 30 includes a bypass pipe 34.
  • the first end 341 of the bypass pipe 34 is connected to the inlet pipe 32 of the indoor electronic expansion valve 320.
  • the second end 342 of the bypass pipe 34 is connected to the valve body 31 of the indoor electronic expansion valve 320. .
  • the refrigerant flows into the valve body 31 from the inlet pipe 32 of the indoor electronic expansion valve 320 and flows out from the outlet pipe 33, causing the valve needle 36 to vibrate and generate refrigerant flow sound.
  • the bypass pipe 34 of the regulating device 30 is provided.
  • the regulating device 30 further includes a one-way valve 35 , which is disposed on the bypass pipe 34 and is configured to pass from the inlet pipe 32 through the bypass pipe 34 There is one-way communication in the direction to the valve body 31 .
  • the one-way valve 35 When the air conditioner 1000 is operating in the heating mode, the one-way valve 35 is in an open state, so that the gas phase refrigerant can be diverted through the bypass pipe 34 to reduce the noise of the valve needle 36 .
  • the one-way valve 35 When the air conditioner 1000 operates in the cooling mode, the one-way valve 35 is in a closed state in the direction of refrigerant flow, so that the air conditioner 1000 can operate normally.
  • FIG. 13 is a flow chart of a control method of an adjustment device according to some embodiments. As shown in Figure 13, the control method is applied to the controller 91 and includes steps S10 to S11.
  • Step S10 Respond to the mode control instruction and read the operating mode carried by the mode control instruction.
  • each mode control instruction corresponds to an operating mode.
  • Operation modes include cooling mode, heating mode, air supply mode or dehumidification mode, etc.
  • the trigger mode control instruction may be implemented by the user inputting through a remote control or control panel, and the remote control or control panel sends the start instruction input by the user to the controller 91 of the air conditioner 1000 .
  • Step S11 when it is read that the operating mode carried by the mode control instruction is the heating mode, the one-way valve 35 is opened.
  • the gas phase refrigerant can be diverted through the bypass pipe 34 to reduce the noise of the valve needle 36 .
  • the one-way valve 35 is opened to reduce the refrigerant flow sound.
  • FIG. 14 is a flow chart of another control method of an adjustment device according to some embodiments.
  • step S11 may include steps S20 to S24.
  • Step S20 Obtain the operating status of the indoor unit 200.
  • Step S21 determine the operating status of the indoor unit 200.
  • execute step S22 executes step S23 to S24.
  • step S22 the opening of the indoor electronic expansion valve 320 is set to the first opening EVI(n1), and the one-way valve 35 is opened.
  • the indoor fan 602 and the indoor heat exchanger 210 are in a closed state.
  • the indoor electronic expansion valve 320 also needs to be controlled.
  • the opening is the first opening EVI(n1).
  • the oil return reliability refers to when the high-temperature and high-pressure gas-phase refrigerant compressed by the compressor 110 is discharged from the exhaust port 111. Due to the fast flow rate and high temperature of the gas-phase refrigerant when it is discharged, part of the compressor oil (i.e. The lubricating oil used in the compressor) forms oil vapor and oil droplets due to the high temperature, and is discharged together with the gas phase refrigerant. The compressor oil circulates with the refrigerant and is deposited in layers in the evaporator and condenser. The compressor oil The loss will affect the operation of the air conditioner 1000. In some embodiments of the present disclosure, the opening of the indoor electronic expansion valve 320 that is not turned on is set to the first opening EVI(n1) to ensure good operation of the air conditioner 1000.
  • step S23 the opening of the indoor electronic expansion valve 320 is set to the second opening EVI(n2).
  • first opening EVI(n1) and the second opening EVI(n2) are preset by the system, and can be set according to requirements during actual application, and this disclosure does not limit this.
  • the second opening degree EVI(n2) is greater than the first opening degree EVI(n1). Since the refrigerant flow rate flowing in the system is small when the indoor unit 200 is in the non-operating state, the refrigerant flow rate in the system is smaller when the indoor unit 200 is in the operating state. The refrigerant flow rate is large, so when the indoor unit 200 transitions from the non-operating state to the operating state, the opening of the indoor electronic expansion valve 320 needs to be increased to meet the refrigerant flow demand in the system.
  • Step S24 After the indoor unit 200 is in the operating state and has passed the first set time T set1 , the one-way valve 35 is opened.
  • the indoor fan 602 and the indoor heat exchanger 210 are turned on, so that the refrigerant flowing in the heat transfer tube of the indoor heat exchanger 210 exchanges heat with the indoor air to assist the temperature. adjust. Therefore, when the indoor unit 200 is in the heating mode, the proportion of gas-phase refrigerant in the system is relatively small and will not have a large impact on the valve needle 36 of the indoor electronic expansion valve 320. Therefore, there is no need to open it in advance.
  • the one-way valve 35 just needs to wait for the first set time T set1 , and then open the one-way valve 35 while the compressor 110 is starting.
  • Figure 15 is a flow chart of yet another control method of an adjustment device according to some embodiments.
  • the control method is applied to the controller 91 and also includes steps S31 to S32.
  • Step S31 After the indoor unit 200 turns on the operating state for the first set time T set1 , the compressor 110 is started, and the operating frequency of the compressor 110 is read.
  • Step S32 if it is determined that the operating frequency of the compressor 110 is equal to the set frequency, the one-way valve 35 is closed.
  • the indoor electronic expansion valve 320 is first opened to balance the inlet of the indoor electronic expansion valve 320.
  • the pressure and temperature at the pipe 32 and the outlet pipe 33 are waited for the first set time T set1 before starting the compressor 110, which can prevent the gas-liquid two-phase refrigerant from causing a large impact on the valve needle 36 of the indoor electronic expansion valve 320. impact, thereby reducing the refrigerant flow sound.
  • the operating frequency of the compressor 110 is equal to the set frequency, the pressure and temperature throughout the system tend to be stable, and refrigerant flow noise is less likely to occur, so the one-way valve 35 can be closed.
  • Figure 16 is a flow chart of yet another control method of an adjustment device according to some embodiments.
  • the control method is applied to the controller 91 and also includes steps S41 to S42.
  • step S41 when the read operating mode is another mode, the opening of the indoor electronic expansion valve 320 is set to the second opening EVI(n2).
  • other modes are modes different from the heating mode, such as cooling mode, etc., which is not limited by the present disclosure.
  • the indoor electronic expansion valve 320 Since the indoor electronic expansion valve 320 is not likely to produce refrigerant flow noise in other modes, it is only necessary to control the opening of the indoor electronic expansion valve 320 at a corresponding opening to balance the system pressure and temperature.
  • Step S42 after the second set time T set2 has passed, the compressor 110 is started.
  • the indoor electronic expansion valve 320 is first opened to balance the pressure and temperature at the inlet pipe 32 and the outlet pipe 33 of the indoor electronic expansion valve 320, and then the compressor 110 is started after waiting for the second set time T set2 .
  • the gas phase refrigerant can be prevented from having a large impact on the valve needle 36 of the indoor electronic expansion valve 320, thereby avoiding the generation of refrigerant flow noise.
  • first set time T set1 and the second set time T set2 are preset by the system.
  • the second set time T set2 is set according to needs and can be equal to the first preset time. Assume time T1, which is not limited in this disclosure.
  • the reading component 81 of the controller 91 is further configured to read the mode carried by the mode control instruction and the operating status of the indoor unit 200 .
  • the adjustment assembly 85 is also configured to adjust the opening of the indoor electronic expansion valve 320 .
  • the reading component 81 of the controller 91 is further configured to read the operating frequency of the compressor 110 .
  • the adjustment assembly 85 is also configured to adjust the operating frequency of the compressor 110 .
  • Figure 17 is a structural diagram of a controller according to some embodiments. As shown in Figure 17, in addition to a memory 92, the controller 91 also includes a processor 93, a communication interface 94 and a communication line 95.
  • the controller 91 refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal to instruct the air conditioner 1000 to execute the control instruction.
  • the controller 91 can be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller , programmable logic device (PLD) or any combination thereof.
  • the controller 91 may also be other devices with processing functions, such as circuits, devices or software modules, which is not limited in this disclosure.
  • controller 91 can be used to control the operation of various components inside the air conditioner 1000, so that the various components of the air conditioner 1000 operate to achieve various predetermined functions of the air conditioner 1000.
  • FIG. 17 only illustrates a scenario in which the controller 91 includes one processor.
  • the above scenario does not constitute a limitation.
  • the number of processors can be set according to requirements.
  • the memory 92 , the processor 93 and the communication interface 94 are connected by a communication line 95 .
  • the memory 92 is used to store computer program codes and data.
  • the computer program codes include instructions and are used by the processor 93 to execute the instructions stored in the memory 92.
  • the communication interface 94 is used to connect with other external devices to receive input content, thereby realizing the present invention. Controller 91 in some embodiments is disclosed.
  • the memory 92 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (Random Access Memory, RAM) or other type that can store information and instructions.
  • a dynamic storage device can also be an electrically erasable programmable read only memory (EEPROM), a compact disc (Compact Disc Read Only Memory, CD ROM) or other optical disc storage, optical disc storage (including compressed Optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), magnetic disk storage medium or other magnetic storage device, or can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer Any other medium, without limitation.
  • the memory 92 may exist independently and be connected to the processor 93 through a bus.
  • the memory 92 may also be integrated with the processor 93.
  • the processor 93 may be a general central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present invention. circuit.
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • the communication interface 94 may be connected to components of the air conditioner 1000 such as the adjustment device 30, the temperature sensor, and the compressor 110 to send signals to or receive signals from the components of the air conditioner 1000.
  • the present disclosure also provides a computer program product including one or more instructions, which can be executed by the controller 91 of the air conditioner 1000 to complete the control in the above embodiments. method.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention concerne un climatiseur (1000), comprenant : une machine extérieure (100), au moins une machine intérieure (200), des soupapes de détente électroniques (300) et un dispositif de commande (91). La machine extérieure (100) comprend un compresseur (110), un échangeur de chaleur extérieur (120) et un échangeur de chaleur intérieur (210), le compresseur (110) comprimant un fluide frigorigène pour entraîner le fluide frigorigène à circuler dans le climatiseur (1000) ; l'échangeur de chaleur extérieur (120) effectue l'une de la liquéfaction et de la vaporisation sur le fluide frigorigène ; l'au moins une machine intérieure (200) est reliée à la machine extérieure (100) ; chaque machine intérieure (200) comprend un échangeur de chaleur intérieur (210) ; et l'échangeur de chaleur intérieur (210) réalise l'autre de la liquéfaction et de la vaporisation sur le fluide frigorigène. Les soupapes de détente électroniques (300) sont reliées à la fois aux échangeurs de chaleur intérieurs (210) et à l'échangeur de chaleur extérieur (120) et sont utilisées pour régler l'écoulement du fluide frigorigène circulant entre l'échangeur de chaleur extérieur (120) et les échangeurs de chaleur intérieurs (210). Le dispositif de commande (91) est configuré pour lire une différence de température, déterminer des degrés de sous-refroidissement des soupapes de détente électroniques (300) en fonction de la différence de température, calculer la différence entre les degrés de sous-refroidissement, déterminer des degrés d'ouverture cibles des soupapes de détente électroniques (300) en fonction de la différence entre les degrés de sous-refroidissement et ajuster les degrés d'ouverture des soupapes de détente électroniques (300) aux degrés d'ouverture cibles.
PCT/CN2023/079666 2022-08-22 2023-03-03 Climatiseur WO2024040915A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN202211008849.4A CN115342476A (zh) 2022-08-22 2022-08-22 一种电子膨胀阀控制方法及控制装置、多联机空调系统
CN202211008849.4 2022-08-22
CN202222221157.X 2022-08-23
CN202211015066.9 2022-08-23
CN202222221157.XU CN218154729U (zh) 2022-08-23 2022-08-23 一种空调系统
CN202211015066.9A CN115388512A (zh) 2022-08-23 2022-08-23 一种空调系统、降低冷媒流动音的控制方法及调节装置

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CN115342476A (zh) * 2022-08-22 2022-11-15 青岛海信日立空调系统有限公司 一种电子膨胀阀控制方法及控制装置、多联机空调系统

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KR20140090323A (ko) * 2013-01-07 2014-07-17 엘지전자 주식회사 공기조화기 및 그 제어 방법
CN104697120A (zh) * 2015-03-24 2015-06-10 广东美的暖通设备有限公司 多联机系统及其的降噪控制方法
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