WO2021233343A1 - 多联机空调系统的回油控制方法 - Google Patents

多联机空调系统的回油控制方法 Download PDF

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Publication number
WO2021233343A1
WO2021233343A1 PCT/CN2021/094640 CN2021094640W WO2021233343A1 WO 2021233343 A1 WO2021233343 A1 WO 2021233343A1 CN 2021094640 W CN2021094640 W CN 2021094640W WO 2021233343 A1 WO2021233343 A1 WO 2021233343A1
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Prior art keywords
oil return
conditioning system
control method
line air
port
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PCT/CN2021/094640
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English (en)
French (fr)
Inventor
宋德跃
王海胜
张铭
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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 WO2021233343A1 publication Critical patent/WO2021233343A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems

Definitions

  • the invention belongs to the technical field of air conditioning, and specifically provides an oil return control method for a multi-connected air conditioning system.
  • the multi-line air-conditioning system includes an outdoor unit and multiple indoor units.
  • the multi-line air-conditioning system When the multi-line air-conditioning system is running under partial load, that is, one part of the multiple indoor units is in the normal on state, and the other part is in the standby or off state.
  • the refrigerating oil from the compressor of the refrigerant returns to the compressor to ensure long-term reliable operation of the compressor.
  • the multi-line air conditioning system will execute the oil return (that is, the refrigerant recovery) command after a period of time, so that the refrigerant in the indoor unit returns to the outdoor In the machine.
  • the execution frequency of the oil return command of the multi-line air-conditioning system depends on the number of standby or shut down indoor units, that is, the more the number of standby or shut down indoor units, the higher the frequency of execution of the oil return command.
  • the throttle valve of the standby or shutdown indoor unit When the multi-line system executes the oil return command, the throttle valve of the standby or shutdown indoor unit will open to a certain degree. At this time, the refrigerant will pass through the indoor unit and will not return to the closed state until the oil return action is completed. It can be seen that during the oil return process of the multi-line air-conditioning system, there is refrigerant flowing in the standby or shutdown indoor unit, and the flowing refrigerant is bound to produce a certain amount of noise, thereby reducing the user experience.
  • the present invention provides an oil return control method for the multi-line air conditioning system.
  • the multi-line air conditioning system of the present invention includes an outdoor unit and a plurality of indoor units, a part of the plurality of indoor units is in a normal power-on state, and the other part is in a standby or shutdown state, and is characterized in that the oil return control method includes The following steps: S100. When it is determined that the multi-line air conditioning system meets the oil return condition, adjust the flow direction of the refrigerant so that the multi-line air conditioning system is in the cooling mode; S200, turn off the outdoor throttling element of the outdoor unit; S300 , Keep the multi-line air-conditioning system working in the current state for a preset period of time.
  • the oil return control method further includes: turning off the indoor throttling element of the standby or shutdown indoor unit after step S200 and before step S300.
  • the oil return control method further includes: after step S200 and before step S300, turning off the indoor throttling element of the indoor unit that is normally turned on.
  • the oil return control method further includes: after step S200 and before step S300, turning off the indoor throttling element of the indoor unit normally turned on, and turning off the standby or shutdown indoor unit Indoor throttling element.
  • the oil return control method further includes: after step S100 and before step S200, adjusting the frequency of the compressor of the outdoor unit to a preset oil return frequency, Wherein, the oil return frequency is less than the frequency of the compressor in the cooling or heating mode of the multi-line air conditioning system.
  • the oil return control method determines that the multi-line air conditioning system satisfies the oil return condition by: starting the multi-line air conditioning system; starting timing; determining the The start-up load gear of the multi-line air conditioning system; the operating time corresponding to the multi-line air-conditioning system meeting the oil return condition is determined according to the start-up load gear; the multi-line air-conditioning system works at the current start-up load gear After the operation time is long, it is determined that the multi-line air conditioning system meets the oil return condition.
  • the outdoor unit further includes a direction control element
  • the direction control element includes a first port, a second port, a third port, and a fourth port.
  • the port communicates with the high-pressure side port of the compressor
  • the second port communicates with a port of the outdoor heat exchanger of the outdoor unit
  • the third port communicates with the indoor heat exchanger of each indoor unit
  • the third port is in communication with the low-pressure side port of the compressor; the step of "adjusting the flow direction of the refrigerant so that the multi-line air conditioning system is in the cooling mode" specifically includes: connecting the first port and the second port Port, and conducts the third port and the fourth port.
  • the direction control element is specifically a four-way valve.
  • the indoor throttle element is an electronic expansion valve.
  • the oil return control method determines that the multi-line air conditioning system satisfies the oil return condition by: starting the multi-line air conditioning system; starting timing; determining the The start-up load gear of the multi-line air conditioning system; the operating time corresponding to the multi-line air-conditioning system meeting the oil return condition is determined according to the start-up load gear; when the multi-line air-conditioning system works at the current start-up load gear After the operating time is long, it is determined that the multi-line air-conditioning system meets the oil return condition.
  • the multi-line air-conditioning system of the present invention includes an outdoor unit and a plurality of indoor units. A part of the multiple indoor units is in a normal power-on state, and the other part is in a standby or shutdown state.
  • the oil return control method of the multi-line air-conditioning system includes the following steps : S100. When it is determined that the multi-line air-conditioning system meets the oil return conditions, adjust the refrigerant flow to make the multi-line air-conditioning system in the cooling mode; S200, turn off the outdoor throttling element of the outdoor unit; S300, keep the multi-line air-conditioning system current The preset duration of the state work operation.
  • the outdoor throttling element of the outdoor unit is forcibly closed.
  • the outdoor unit uses a vacuum method to draw the refrigerant in the indoor heat exchanger back to the outdoor unit to complete the entire return.
  • the oil (refrigerant recovery) process basically no refrigerant flows through the standby or shut down indoor unit during the oil return process. Even if there is, there is a small amount of refrigerant in the pipeline between the outdoor throttling element and the indoor heat exchanger. The noise generated is not enough to affect the user experience, so the oil return control method can not only realize the oil return, ensure the long-term reliable operation of the system, but also reduce the refrigerant sound generated during the oil return process and eliminate user complaints.
  • Figure 1 is a schematic diagram of the specific structure of the multi-connected air conditioning system of the present invention.
  • Fig. 7 is a control flow diagram of a specific embodiment of determining that the multi-line air conditioning system meets the oil return condition in the oil return control method of the present invention.
  • CP compressor 4WV four-way valve, first port a, second port b, third port c, fourth port d, EHo outdoor heat exchanger, gas-liquid separator SPR, EHi1 first indoor heat exchanger, EHi2 The second indoor heat exchanger, XVo outdoor throttling element, XVi1 first indoor throttling element, XVi2 second indoor throttling element.
  • the multi-line air-conditioning system of the present invention includes an outdoor unit and a plurality of indoor units, and the plurality of indoor units are arranged in parallel with each other, wherein the quantifier "multiple" of the plurality of indoor units includes integers such as two, three, and four.
  • the number of outdoor units of the multi-connected air conditioning system of the present invention is not limited to one, it can also be multiple, and the number of outdoor units is smaller than the number of indoor units.
  • the multi-line air conditioning system includes an outdoor unit, a first indoor unit, and a second indoor unit.
  • the outdoor unit includes a compressor CP, a directional control valve, an outdoor heat exchanger EHo, an outdoor throttling element XVo, and a gas-liquid separator SPR; the outdoor heat exchanger EHo and the outdoor throttling element XVo are connected in series to form the main refrigerant circulation circuit.
  • An indoor unit includes a first indoor heat exchanger EHi1 and a first indoor throttle element XVi1, which are connected in series to form a first refrigerant circulation branch; the second indoor unit includes a second indoor heat exchanger EHi2 and a second indoor section The flow element XVi2 is also connected in series to form a second refrigerant circulation branch.
  • One port of the first refrigerant circulation branch and the second refrigerant circulation branch in parallel is connected in series to a port of the refrigerant circulation main circuit on the side of the outdoor throttle element XVo, and the first indoor throttle element XVi1 is set close to the outdoor
  • the second indoor throttle element XVi2 is arranged on the second refrigerant circulation branch on the side of the second refrigerant circulation near the outdoor throttle element XVo.
  • the direction control element in this embodiment is specifically a four-way valve 4WV.
  • the four-way valve 4WV has a first port a, a second port b, a third port c, and a fourth port d; the first port a and the compressor CP
  • the second port b is connected to the other port of the main refrigerant circulation circuit where the outdoor heat exchanger EHo is located, and the third port c is connected in parallel with the first refrigerant circulation branch and the second refrigerant circulation branch.
  • the other port is in communication, and the fourth port d is in communication with the low-pressure side port of the compressor CP through the gas-liquid separator SPR.
  • the four-way valve 4WV has two working positions. Adjusting its working position can adjust the flow of refrigerant in the multi-connected air-conditioning system, and then switch the cooling mode and heating mode of the multi-connected air-conditioning system.
  • the four-way valve 4WV when the four-way valve 4WV is in the first working position, the first port a and the second port b are conducted, and the third port c and the fourth port d are conducted, and the multi-line air conditioning system is in the cooling mode.
  • the working principle of the refrigeration mode of the multi-line air conditioning system is as follows: First, the compressor CPCP compresses the low-temperature and low-pressure refrigerant vapor into high-temperature and high-pressure superheated vapor; secondly, the refrigerant flows into the outdoor heat exchanger EHo through the four-way valve 4WV, and exchanges heat outdoors.
  • the heat exchange in the EHo transfers the heat to the air, and the refrigerant is condensed into a high-temperature and high-pressure liquid; again, the refrigerant flowing through the outdoor throttling element XVo becomes saturated after being throttled; then, the saturated refrigerant is diverted It flows into the first refrigerant circulation branch and the second refrigerant circulation branch respectively, and evaporates and absorbs heat in the first indoor heat exchanger EHi1 and the second indoor heat exchanger EHi2 to become low-temperature superheated vapor; finally, after the low-temperature superheated refrigerant converges It enters the gas-liquid separator SPR through the four-way valve 4WV, and is sucked into the compressor CP after the gas-liquid separation is carried out in the gas-liquid separator SPR. In this way, the multi-connected air-conditioning system continuously circulates and cools, absorbing heat from the indoor air.
  • the four-way valve 4WV When the four-way valve 4WV is switched from the first working position to the second working position, the first port a and the third port c are connected, the second port b and the fourth port d are connected, and the multi-line air conditioning system is switched from the cooling mode to Heating mode.
  • the heating mode of the multi-line air conditioning system works as follows: First, the compressor CPCP compresses the low-temperature and low-pressure refrigerant vapor into high-temperature and high-pressure superheated vapor; secondly, the refrigerant flows into the first refrigerant circulation branch and the first refrigerant circulation branch after passing through the four-way valve 4WV.
  • the second refrigerant circulation branch heat exchange is carried out in the first indoor heat exchanger EHi1 and the second indoor heat exchanger EHi2 to transfer heat to the air, and the refrigerant is condensed into a high-temperature and high-pressure liquid, which is separated by the first indoor heat exchanger.
  • the flow element XVi1 and the second indoor throttling element XVi2 throttling and depressurizing the two-phase refrigerant of high temperature and low pressure and then converge to the main refrigerant circulation circuit; again, the confluence of the refrigerant flows into the outdoor heat exchanger EHo and is absorbed in the outdoor heat exchanger EHo. The heat turns into low-temperature superheated vapor; finally, the low-temperature superheated refrigerant flows through the four-way valve 4WV and enters the gas-liquid separator SPR, where it undergoes gas-liquid separation in the gas-liquid separator SPR and is sucked into the compressor CP. In this cycle, the multi-connected air-conditioning system continuously circulates heating and releases heat to the indoor environment.
  • the current working status of the two indoor units is different according to the actual needs of users, for example: when the ambient temperature of the first indoor unit has reached the target set by the user When the temperature is high, the current working state of the first indoor unit is switched from normal power on to standby, or one indoor unit is turned off to save power because no one is living in the room, while the other indoor unit is still in the normal power-on cooling or heating state.
  • the multi-line air conditioning system will execute the oil return (ie, recover refrigerant) command every time a period of time passes, so that the refrigerant in the indoor unit returns to the outdoor unit.
  • the execution frequency of the oil return command of the multi-line air-conditioning system depends on the number of standby or shut down indoor units, that is, the more the number of standby or shut down indoor units, the higher the frequency of execution of the oil return command.
  • the throttle valve of the standby or shutdown indoor unit When the multi-line system executes the oil return command, the throttle valve of the standby or shutdown indoor unit will open to a certain degree. At this time, the refrigerant will pass through the indoor unit and will not return to the closed state until the oil return action is completed. It can be seen that during the oil return process of the multi-line air-conditioning system, there is refrigerant flowing in the standby or shutdown indoor unit, and the flowing refrigerant is bound to produce a certain amount of noise, thereby reducing the user experience.
  • the present invention provides an oil return control method.
  • the following five specific embodiments are used to describe the oil return control method of the multi-line air conditioning system of the present invention in detail with reference to FIGS.
  • the oil return control method of the multi-connected air conditioning system in the first embodiment includes the following steps:
  • the current working mode of the multi-line air conditioning system is cooling mode, no operation is required.
  • the refrigerant flow direction remains unchanged; if the current working mode of the multi-line air conditioning system is heating mode, adjust the four-way valve The working position is used to change the flow direction of the refrigerant, so that the multi-line air-conditioning system is switched from heating mode to cooling mode.
  • the specific adjustment method is described in detail in the previous article, so I will not repeat it here.
  • the outdoor throttling element in this embodiment preferably adopts an electronic expansion valve.
  • Closing the outdoor throttling element means adjusting its opening, and closing the outdoor throttling element is limited to adjusting its opening to 0.
  • Outdoor throttling The specific numerical range of the opening degree of the element in the closed state depends on its mechanical structure, which is set by those skilled in the art according to the specific structure of the outdoor throttling element used.
  • the multi-line air-conditioning system can run in the current working state to complete the oil return work depends on the specific structure of the multi-line air-conditioning system and its operating parameters, which can be set by those skilled in the art according to the actual situation. Data analysis after several tests found that the oil return work can be completed after keeping the multi-line air-conditioning system running in the current working state for 4 to 9 minutes under normal circumstances, and the preferred operating time is 5 minutes. After completing the oil return mode, the multi-line air conditioning system can return to the working mode before the oil return.
  • the outdoor throttling element of the outdoor unit when the system needs to return oil, the outdoor throttling element of the outdoor unit is forcibly turned off. At this time, the outdoor unit uses a vacuum to remove the refrigerant in the indoor heat exchanger. Withdraw the outdoor unit to complete the entire oil return (refrigerant recovery) process, and basically no refrigerant flows through the standby or shut down indoor unit during the oil return process, even if it is in the pipeline between the outdoor throttling element and the indoor heat exchanger The noise generated by this amount of refrigerant is not enough to affect the user’s experience. Therefore, the oil return control method can not only achieve oil return, ensure the long-term reliable operation of the system, but also reduce the refrigerant sound generated during the oil return process and eliminate Users complain.
  • the oil return control method of the multi-connected air conditioning system in the second embodiment includes the following steps:
  • the indoor throttling element in this embodiment preferably adopts an electronic expansion valve.
  • Closing the indoor throttling element refers to adjusting its opening, and closing the indoor throttling element is limited to adjusting its opening to 0.
  • the indoor throttling element The specific numerical range of the opening degree of the element in the closed state depends on its mechanical structure, which is set by those skilled in the art according to the specific structure of the indoor throttle element used.
  • the oil return control method in this embodiment not only turns off the outdoor throttling element of the outdoor unit, but also turns off the indoor throttling element of the standby or shut down indoor unit, which completely eliminates the oil return process.
  • the possibility that the refrigerant in the pipeline from the outdoor throttling element to the standby or shutdown indoor unit flows to standby or shuts down the indoor unit can be said to completely eliminate the possibility of refrigerant flow noise generated by the standby or shutdown indoor unit.
  • the oil return control method of the multi-connected air conditioning system in the third embodiment includes the following steps:
  • the indoor throttling element in this embodiment preferably adopts an electronic expansion valve.
  • Closing the indoor throttling element refers to adjusting its opening, and closing the indoor throttling element is limited to adjusting its opening to 0.
  • the indoor throttling element The specific numerical range of the opening degree of the element in the closed state depends on its mechanical structure, which is set by those skilled in the art according to the specific structure of the indoor throttle element used.
  • the oil return control method in this embodiment not only turns off the outdoor throttling element of the outdoor unit, but also turns off the indoor throttling element of the indoor unit that is normally turned on. This not only reduces the oil return process This eliminates the possibility of refrigerant flow noise generated by the indoor unit on standby or when it is turned off, and completely eliminates the possibility of refrigerant flow noise generated by the indoor unit normally turned on.
  • the oil return control method of the multi-connected air conditioning system in the fourth embodiment includes the following steps:
  • the oil return control method in this embodiment not only turns off the outdoor throttling element of the outdoor unit and the indoor throttling element of the standby or shut down indoor unit, but also turns off the indoor throttle of the indoor unit normally turned on.
  • the flow element cuts off the pipeline between the outdoor throttling element and the indoor throttling element of all indoor units and the passage of the indoor heat exchanger.
  • there is no refrigerant flowing into the indoor unit during standby or shutdown and normal startup. which greatly reduces the possibility of refrigerant sound on the indoor unit side.
  • the sequence of steps S201 and S202 can be adjusted, that is, after turning off the indoor throttling element of the standby or shutting down the indoor unit, the indoor throttling element of the normally turned on indoor unit can be turned off, or it can be turned off when the indoor throttle of the normally turned on indoor unit is turned off. After the flow element, turn off the indoor throttling element of the indoor unit that is normally turned on.
  • the oil return control method of the multi-connected air conditioning system in the fifth embodiment includes the following steps:
  • this embodiment includes step S101 after step S100 and before step S200.
  • the compressor frequency is adjusted to the oil return frequency, which is compared with the normal cooling or normal heating mode.
  • the lower compressor oil return frequency can ensure the stability of compressor refrigerant recovery.
  • the setting of the compressor oil return frequency depends on the structure and performance parameters of the multi-connected air conditioning system. Take the structure in Figure 1 as an example. Normally, the compressor’s oil return frequency is preset to 30Hz-60Hz. The exemplary description of the parameter setting does not limit the protection scope of the present invention.
  • step S101 in the fifth embodiment is also applicable to any one of the first to third embodiments of the oil return control method. Those skilled in the art can clearly and unambiguously know based on the record in the foregoing fifth embodiment, which will not be repeated here.
  • the oil return control method of the multi-line air-conditioning system of the present invention is implemented when the multi-line air-conditioning system meets the oil return conditions. There are methods to determine whether the multi-line air conditioning system meets the oil return conditions. There are many types, which are determined by the start-up load in this implementation. Referring to Fig. 7, it can be seen that the oil return control method of the present invention determines that the multi-line air conditioning system meets the oil return conditions in the following manner:
  • the multi-line air-conditioning system includes a first starting load gear, a second starting load gear, a third starting load gear, and a fourth starting load gear.
  • the first starting load gear is smaller than the second starting load gear.
  • the starting load gear is smaller than the third starting load gear, and the third starting load gear is smaller than the fourth starting load gear.
  • a multi-connected air conditioning system includes four start-up load positions, namely the first start-up load position (less than or equal to 25% of the total start-up load) and the second start-up load position (greater than the total start-up load). 25% and less than 50% of the total starting load), the third starting load gear (greater than or equal to 50% of the total starting load and less than or equal to 75% of the total starting load) and the fourth starting load gear (greater than the total 75% of the start-up load is less than the total start-up load), where the total start-up load refers to the start-up load when each indoor unit of the multi-connected air conditioning system is in a normal start-up state.
  • S104 Determine the operating time corresponding to the multi-line air conditioning system meeting the oil return condition according to the start-up load gear.
  • the multi-connected air-conditioning system meets the oil return condition after operating for the first time (4 hours).
  • the multi-line air-conditioning system meets the oil return condition after running for a second time period (6 hours), and the second time period is greater than the first time period.
  • the multi-connected air-conditioning system meets the oil return condition after the third period (12 hours) of operation, and the third period is greater than the second period.
  • the multi-line air-conditioning system meets the oil return condition after the fourth period of operation (24 hours), and the fourth period is greater than the third period.
  • this embodiment only exemplarily illustrates the start-up load gear division parameter of the multi-line air conditioning system and the corresponding relationship between it and the multi-line running time. This example does not limit the protection scope of the present invention.
  • the operation time corresponding to each start-up load gear mainly depends on the oil output rate of the compressor. The higher the oil output rate of the compressor, the shorter the operation time corresponding to the oil return condition of the multi-connected air conditioning system. Otherwise, the longer.

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Abstract

一种多联机空调系统的回油控制方法，包括：在多联机空调系统满足回油条件的情况下，调整冷媒流向以使多联机空调系统处于制冷模式，关闭室外机的室外节流元件，保持多联机空调系统以当前工作状态运行预设时长。

Description

多联机空调系统的回油控制方法 技术领域
本发明属于空调技术领域，具体提供一种多联机空调系统的回油控制方法。
背景技术
多联机空调系统包括室外机和多台室内机，该多联机空调系统在部分负荷状态下运行时，即多台室内机中一部分处于正常开机状态，另一部分处于待机或关机状态，为了控制溶于冷媒的压缩机冷冻油回到压缩机，来保证压缩机长期可靠运转，该多联机空调系统每经过一段时间都会执行回油(亦即回收冷媒)指令，让室内机里的冷媒重新回到室外机中。多联机空调系统回油指令的执行频次取决于待机或关机的室内机的台数，也就是说，待机或关机的室内机台数越多，执行回油指令的频次越高。
当多联机系统执行回油指令时，待机或关机的室内机的节流阀会打开一定的开度，此时冷媒会经过该室内机，直到完成回油动作后才恢复到关闭状态。可见，多联机空调系统在回油过程中，待机或关机的室内机内有冷媒流动，流动的冷媒势必会产生一定的噪音，从而降低了用户的使用体验。
有鉴于此，如何降低乃至消除回油过程中多联机空调系统的待机或关机室内机内冷媒音，是本领域技术人员需要解决的技术问题。
发明内容
为了降低乃至消除回油过程中多联机空调系统的待机或关机室内机内冷媒音，本发明提供一种多联机空调系统的回油控制方法。
本发明的所述多联机空调系统包括室外机和多个室内机，多个所述室内机的一部分处于正常开机状态，另一部分处于待机或关机状态，其特征在于，所述回油控制方法包括如下步骤：S100、在确 定所述多联机空调系统满足回油条件的情况下，调整冷媒流向以使所述多联机空调系统处于制冷模式；S200、关闭所述室外机的室外节流元件；S300、保持所述多联机空调系统以当前状态工作运行预设时长。
本发明的上述回油控制方法的一优选方案中，所述回油控制方法还包括：在步骤S200之后、步骤S300之前，关闭待机或关机室内机的室内节流元件。
本发明的上述回油控制方法的一优选方案中，所述回油控制方法还包括：在步骤S200之后、步骤S300之前，关闭正常开机室内机的室内节流元件。
本发明的上述回油控制方法的一优选方案中，所述回油控制方法还包括：在步骤S200之后、步骤S300之前，关闭正常开机室内机的室内节流元件，关闭待机或关机室内机的室内节流元件。
本发明的上述回油控制方法的一优选方案中，所述回油控制方法还包括：在步骤S100之后、步骤S200之前，调整所述室外机的压缩机的频率至预设的回油频率，其中，所述回油频率小于所述多联机空调系统在制冷或制热模式下所述压缩机的频率。
本发明的上述回油控制方法的一优选方案中，所述回油控制方法通过下述方式确定所述多联机空调系统满足回油条件：启动所述多联机空调系统；开始计时；确定所述多联机空调系统的开机负荷档位；根据所述开机负荷档位来确定所述多联机空调系统满足回油条件所对应的运行时长；所述多联机空调系统以当前开机负荷档位工作对应的运行时长后，则确定所述多联机空调系统满足回油条件。
本发明的上述回油控制方法的一优选方案中，所述室外机还包括方向控制元件，所述方向控制元件包括第一端口、第二端口、第三端口和第四端口，所述第一端口和所述压缩机的高压侧端口连通，所述第二端口和所述室外机的室外换热器的一端口连通，所述第三端口与每个所述室内机的室内换热器连通，所述第三端口与所述压缩机的低压侧端口连通；“调整冷媒流向以使所述多联机空调系统处于制冷模式”的步骤具体包括：导通所述第一端口和所述第二端口，并导通所述第三端口和所述第四端口。
本发明的上述回油控制方法的一优选方案中，所述方向控制元件具体为四通阀。
本发明的上述回油控制方法的一优选方案中，所述室内节流元件是电子膨胀阀。
本发明的上述回油控制方法的一优选方案中，所述回油控制方法通过下述方式确定所述多联机空调系统满足回油条件：启动所述多联机空调系统；开始计时；确定所述多联机空调系统的开机负荷档位；根据所述开机负荷档位来确定所述多联机空调系统满足回油条件所对应的运行时长；当所述多联机空调系统以当前开机负荷档位工作对应的运行时长后，则确定所述多联机空调系统满足回油条件。
本发明的多联机空调系统包括室外机和多个室内机，多个所述室内机的一部分处于正常开机状态，另一部分处于待机或关机状态，该多联机空调系统的回油控制方法包括如下步骤：S100、在确定多联机空调系统满足回油条件的情况下，调整冷媒流向以使多联机空调系统处于制冷模式；S200、关闭室外机的室外节流元件；S300、保持多联机空调系统以当前状态工作运行预设时长。
该回油控制方法中，当系统需要回油时，强制关闭室外机的室外节流元件，此时室外机类似使用抽真空的形式将室内换热器内的冷媒抽回室外机，完成整个回油(冷媒回收)过程，而且在回油过程中基本上没有冷媒流过待机或关机室内机，即便有也是室外节流元件和室内换热器之间管路内的少许冷媒，这部分冷媒量产生的噪音不足于影响用户的使用体验，从而该回油控制方法既可以实现回油，保障系统长期可靠运行，也可以降低回油过程中产生的冷媒音，消除用户抱怨。
附图说明
图1是本发明的多联机空调系统的具体结构示意图；
图2至6分别是本发明的多联机空调系统的回油控制方法的第一种至第五种实施例的控制流程示意图；
图7是本发明的回油控制方法中确定多联机空调系统满足回油条件的具体实施例的控制流程示意图。
其中，图1中各组件名称与附图标记之间的一一对应关系如下所示：
CP压缩机、4WV四通阀、第一端口a、第二端口b、第三端口c、第四端口d、EHo室外换热器、气液分离器SPR、EHi1第一室内换热器、EHi2第二室内换热器、XVo室外节流元件、XVi1第一室内节流元件、XVi2第二室内节流元件。
具体实施方式
下面参照附图来描述本发明的优选实施方式。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发明的技术原理，并非旨在限制本发明的保护范围。
需要说明的是，在本申请的描述中，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。
本发明的多联机空调系统包括室外机和多个室内机且多个室内机相互并联设置，其中，多个室内机的数量词“多个”包括两个、三个、四个等整数个。并且，本发明的多联机空调系统的室外机数量也不局限于一个，其也可以是多个，且室外机的数量小于室内机的数量。
接下来结合图1的示例来详细说明多联机空调系统的典型结构及工作原理。
参见图1，该多联机空调系统包括室外机、第一室内机和第二室内机。其中，室外机包括压缩机CP、方向控制阀、室外换热器EHo、室外节流元件XVo和气液分离器SPR；室外换热器EHo和室外节流元件XVo串联连接形成冷媒循环主路，第一室内机包括第一室内换热器EHi1和第一室内节流元件XVi1，两者相互串联连接形成第一冷媒循环支路；第二室内机包括第二室内换热器EHi2和第二室内节流元件XVi2，两者也相互串联连接形成第二冷媒循环支路。第一冷媒循环支路和第二冷媒循环支路并联后的一个端口串接在靠近室外节流元件XVo侧的冷媒循环主路的一个端口上，且第一室内节流元件XVi1设置在靠近室外节流元件XVo侧的第一冷媒循环支路上，第二室内节流元件XVi2设置在第二冷媒循环支路的靠近室外节流元件XVo侧的第二冷媒循环支路上。
本实施例中方向控制元件具体为四通阀4WV，详细地，四通阀4WV具有第一端口a、第二端口b、第三端口c和第四端口d； 第一端口a与压缩机CP的高压侧端口连通，第二端口b与室外换热器EHo所在的冷媒循环主路的另一个端口连通，第三端口c与第一冷媒循环支路和第二冷媒循环支路并联后形成的另一个端口连通，第四端口d通过气液分离器SPR与压缩机CP的低压侧端口连通。四通阀4WV具有两个工作位置，调整其工作位置即可调整多联机空调系统内的冷媒流向，继而切换多联机空调系统的制冷模式和制热模式。
详细地，四通阀4WV位于第一工作位置时，第一端口a和第二端口b导通，第三端口c和第四端口d导通，多联机空调系统处于制冷模式。
多联机空调系统的制冷模式的工作原理为：首先，压缩机CPCP将低温低压的冷媒蒸气压缩为高温高压过热的蒸气；其次，冷媒经四通阀4WV流入室外换热器EHo，在室外换热器EHo内进行热交换把热量传递到空气中去，冷媒冷凝为高温高压的液体；再次，流经室外节流元件XVo的冷媒经过节流后变为饱和状态；然后，饱和状态的冷媒分流后分别流入第一冷媒循环支路和第二冷媒循环支路，在第一室内换热器EHi1和第二室内换热器EHi2内蒸发吸热变为低温过热蒸气；最后，低温过热的冷媒汇流后经四通阀4WV进入气液分离器SPR，在气液分离器SPR内进行气液分离后被吸入压缩机CP内。如此循环往复，多联机空调系统不断循环制冷，从室内空气中吸收热量。
四通阀4WV由第一工作位置切换至第二工作位置时，第一端口a和第三端口c导通，第二端口b和第四端口d导通，多联机空调系统由制冷模式切换至制热模式。
多联机空调系统的制热模式的工作原理为：首先，压缩机CPCP将低温低压的冷媒蒸气压缩为高温高压过热的蒸气；其次，冷媒经四通阀4WV后分别流入第一冷媒循环支路和第二冷媒循环支路，在第一室内换热器EHi1和第二室内换热器EHi2内进行热交换把热量传递到空气中去，冷媒冷凝为高温高压的液体，并分别由第一室内节流元件XVi1和第二室内节流元件XVi2节流降压为高温低压的两相冷媒后汇流到冷媒循环主路上；再次，汇流后冷媒流入室外换热器EHo，在室外换热器EHo内吸热变为低温过热蒸气；最后，低温过热的冷媒汇流后经四通阀4WV进入气液分离器SPR，在气液分离器SPR内进 行气液分离后被吸入压缩机CP内。如此循环往复，多联机空调系统不断循环制热，向室内环境释放热量。
多联机空调系统在制冷或制热模式下运行时，根据用户实际需求不同，两个室内机的当前工作状态也不尽相同，例如：当第一室内机所在环境温度已达到用户设定的目标温度时，第一室内机当前工作状态由正常开机切换至待机，或者是因一个室内机所在房间没人居住为了省电将其关机，而另一个室内机仍然处于正常开机制冷或制热状态。
如背景技术中所述，在多个室内机中一部分处于关机或待机状态，另一部分处于正常开机状态下，为了控制溶于冷媒的压缩机冷冻油回到压缩机，来保证压缩机长期可靠运转，该多联机空调系统每经过一段时间都会执行回油(亦即回收冷媒)指令，让室内机里的冷媒重新回到室外机中。多联机空调系统回油指令的执行频次取决于待机或关机的室内机的台数，也就是说，待机或关机的室内机台数越多，执行回油指令的频次越高。当多联机系统执行回油指令时，待机或关机的室内机的节流阀会打开一定的开度，此时冷媒会经过该室内机，直到完成回油动作后才恢复到关闭状态。可见，多联机空调系统在回油过程中，待机或关机的室内机内有冷媒流动，流动的冷媒势必会产生一定的噪音，从而降低了用户的使用体验。
为了降低乃至消除回油过程中多联机空调系统的待机或关机室内机内冷媒音，本发明提供了一种回油控制方法。为了便于更好地理解，下面结合图2至6通过五种具体实施例来对本发明的多联机空调系统的回油控制方法进行详细说明，其中，图2至6分别是本发明的多联机空调系统的回油控制方法的第一、第二、第三、第四和第五种实施例的控制流程示意图。需要说明的是，为了保证本文的可读性，这五种实施例中对同样的步骤采用相同的步骤标记。
第一种实施例：
参见图2，第一种实施例中多联机空调系统的回油控制方法包括如下步骤：
S100、在多联机空调系统满足回油条件的情况下，调整冷媒流向以使多联机空调系统处于制冷模式。
需要说明的是，如果多联机空调系统的当前工作模式为制冷模式时无需进行任何操作冷媒流向保持不变；如果多联机空调系统的当前工作模式为制热模式时，则通过调整四通阀的工作位置来改变冷媒流向，使多联机空调系统由制热模式切换至制冷模式，具体调整方式前文中有详细记载，在此不再赘述。
S200、关闭室外机的室外节流元件。
需要说明的是，本实施例中室外节流元件优选采用电子膨胀阀，关闭室外节流元件是指调整其开度，关闭室外节流元件并仅限于将其开度调整为0，室外节流元件关闭状态下其开度具体数值范围取决于其机械结构，本领域技术人员根据采用的室外节流元件的具体结构来设定。
S300、保持多联机空调系统以当前工作状态运行预设时长。
需要说明的是，多联机空调系统以当前工作状态运行多长时间方能完成回油工作取决于多联机空调系统的具体结构及其运行参数，本领域技术人员可根据实际情况来设定，经多次试验后的数据分析发现通常情况下保持多联机空调系统以当前工作状态运行4分钟至9分钟后即可完成回油工作，优选运行时长为5分钟。完成回油模式后，多联机空调系统即可返回回油前的工作模式。
本实施例中多联机空调系统的回油控制方法中，当系统需要回油时，强制关闭室外机的室外节流元件，此时室外机类似使用抽真空的形式将室内换热器内的冷媒抽回室外机，完成整个回油(冷媒回收)过程，而且在回油过程中基本上没有冷媒流过待机或关机室内机，即便有也是室外节流元件和室内换热器之间管路内的少许冷媒，这部分冷媒量产生的噪音不足于影响用户的使用体验，从而该回油控制方法既可以实现回油，保障系统长期可靠运行，也可以降低回油过程中产生的冷媒音，消除用户抱怨。
第二种实施例：
参见图3，第二种实施例中多联机空调系统的回油控制方法包括如下步骤：
S100、在确定多联机空调系统满足回油条件的情况下，调整冷媒流向以使多联机空调系统处于制冷模式；
S200、关闭室外机的室外节流元件；
S201、关闭待机或关机室内机的室内节流元件；
S300、保持多联机空调系统以当前工作状态运行预设时长。
需要说明的是，本实施例中室内节流元件优选采用电子膨胀阀，关闭室内节流元件是指调整其开度，关闭室内节流元件并仅限于将其开度调整为0，室内节流元件关闭状态下其开度具体数值范围取决于其机械结构，本领域技术人员根据采用的室内节流元件的具体结构来设定。
与第一种实施例相比，本实施例中的回油控制方法除了关闭室外机的室外节流元件外，还关闭了待机或关机室内机的室内节流元件，回油过程中完全消除了室外节流元件至待机或关机室内机之间管路内冷媒流向待机或关闭室内机的可能性，可以说完全消除了待机或关机室内机产生冷媒流动噪音的可能性。
第三种实施例：
参见图4，第三种实施例中多联机空调系统的回油控制方法包括如下步骤：
S100、在确定多联机空调系统满足回油条件的情况下，调整冷媒流向以使多联机空调系统处于制冷模式；
S200、关闭室外机的室外节流元件；
S202、关闭正常开机室内机的室内节流元件；
S300、保持多联机空调系统以当前工作状态运行预设时长。
需要说明的是，本实施例中室内节流元件优选采用电子膨胀阀，关闭室内节流元件是指调整其开度，关闭室内节流元件并仅限于将其开度调整为0，室内节流元件关闭状态下其开度具体数值范围取决于其机械结构，本领域技术人员根据采用的室内节流元件的具体结构来设定。
与第二种实施例相比，本实施例中的回油控制方法除了关闭室外机的室外节流元件外，还关闭了正常开机室内机的室内节流元件，这样在回油过程中不仅降低了待机或关机室内机产生冷媒流动噪音的可能性，而且完全消除了正常开机室内机产生冷媒流动噪音的可能性。
第四种实施例：
参见图5，第四种实施例中多联机空调系统的回油控制方法包括如下步骤：
S100、在确定多联机空调系统满足回油条件的情况下调整冷媒流向以使多联机空调系统处于制冷模式；
S200、关闭室外机的室外节流元件；
S201、关闭待机或关机室内机的室内节流元件；
S202、关闭正常开机室内机的室内节流元件；
S300、保持多联机空调系统以当前工作状态运行预设时长。
与前面三种实施例相比，本实施例中的回油控制方法除了关闭室外机的室外节流元件外以及待机或关机室内机的室内节流元件，还关闭了正常开机室内机的室内节流元件，切断了室外节流元件至所有室内机的室内节流元件之间管路与室内换热器的通道，在回油过程中待机或关机室内机和正常开机室内机中都没有冷媒流入，极大地降低了室内机侧产生冷媒音的可能性。
另外，步骤S201和S202先后顺序可以调整，即可以在关闭待机或关机室内机的室内节流元件后，再关闭正常开机室内机的室内节流元件，也可以在关闭正常开机室内机的室内节流元件后，再关闭正常开机室内机的室内节流元件。
第五种实施例：
参见图6，第五种实施例中多联机空调系统的回油控制方法包括如下步骤：
S100、在确定多联机空调系统满足回油条件的情况下，调整冷媒流向以使多联机空调系统处于制冷模式；
S101、调整室外机的压缩机的频率至预设的回油频率，所述回油频率小于多联机空调系统在制冷或制热模式下压缩机的频率；
S200、关闭室外机的室外节流元件；
S201、关闭待机或关机室内机的室内节流元件；
S202、关闭正常开机室内机的室内节流元件；
S300、保持多联机空调系统以当前工作状态运行预设时长。
与第四种实施例相比，本实施例在步骤S100之后，步骤S200之前设置了步骤S101，该步骤中将压缩机的频率调整至回油频率，相对于正常制冷或正常制热模式相比，较低的压缩机回油频率能保证压缩机冷媒回收的稳定性。压缩机回油频率的设定取决于多联机空调系统的结构及性能参数，以图1中结构为例通常情况下压缩机的回油频率预设为30Hz-60Hz，可以理解本实施例中对该参数设定的示例性说明并不限定本发明的保护范围。
另外，需要说明的是，第五种实施例中的步骤S101也适用于第一种至第三种实施例中任一种的回油控制方法。本领域技术人员基于前面第五种实施例中记载可以清楚且毫无疑义的获知，本文在此不再赘述。
如前面五种实施例所述，本发明的多联机空调系统的回油控制方法是在多联机空调系统满足回油条件的情况下实施的，确定多联机空调系统是否满足回油条件的方法有很多种，本实施中通过开机负荷大小来确定，参见图7可知，本发明的回油控制方法通过下述方式确定多联机空调系统满足回油条件：
S101、启动多联机系统；
S102、开始计时；
S103、确定多联机空调系统的开机负荷档位。例如：
多联机空调系统包括第一开机负荷档位、第二开机负荷档位、第三开机负荷档位和第四开机负荷档位，且第一开机负荷档位小于第二开机负荷档位，第二开机负荷档位小于第三开机负荷档位，第三开机负荷档位小于第四开机负荷档位。
具体地，通常情况下，多联机空调系统包括四个开机负荷档位，分别为第一开机负荷档位(小于或等于总开机负荷的25％)、第二开机负荷档位(大于总开机负荷的25％并小于总开机负荷的50％)、第三开机负荷档位(大于或等于总开机负荷的50％并小于或等于总开机负荷的75％)和第四开机负荷档位(大于总开机负荷的75％并小于总开机负荷)，其中，总开机负荷是指该多联机空调系统的每个室内机都处于正常开机状态时的开机负荷。
S104、根据开机负荷档位来确定多联机空调系统满足回油条件所对应的运行时长。
S105、当所述多联机空调系统以当前开机负荷档位工作对应的运行时长后，则确定所述多联机空调系统满足回油条件。
详细地，当开机负荷档位位于第一开机负荷档位时，多联机空调系统运行第一时长(4小时)后满足回油条件。
当开机负荷档位位于第二开机负荷档位时，多联机空调系统运行第二时长(6小时)后满足回油条件，第二时长大于第一时长。
当开机负荷档位位于第三开机负荷档位时，多联机空调系统运行第三时长(12小时)后满足回油条件，第三时长大于第二时长。
当开机负荷档位位于第四开机负荷档位时，多联机空调系统运行第四时长(24小时)后满足回油条件，第四时长大于第三时长。
需要说明的是，本实施例仅是示例性地说明了多联机空调系统的开机负荷档位划分参数以及其与多联机运行时长之间的对应关系，该示例并不限定本发明的保护范围。
另外，与各个开机负荷档位相对应地运行时长主要取决于压缩机的出油率，压缩机的出油率越高，多联机空调系统的满足回油条件所对应地的运行时长越短，反之则越长。
至此，已经结合附图所示的优选实施方式描述了本发明的技术方案，但是，本领域技术人员容易理解的是，本发明的保护范围显然不局限于这些具体实施方式。在不偏离本发明的原理的前提下，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发明的保护范围之内。

Claims (10)

  1. 一种多联机空调系统的回油控制方法，所述多联机空调系统包括室外机和多个室内机，多个所述室内机的一部分处于正常开机状态，另一部分处于待机或关机状态，其特征在于，所述回油控制方法包括如下步骤：
    S100：在所述多联机空调系统满足回油条件的情况下，调整冷媒流向以使所述多联机空调系统处于制冷模式；
    S200：关闭所述室外机的室外节流元件；
    S300：保持所述多联机空调系统以当前工作状态运行预设时长。
  2. 根据权利要求1所述的回油控制方法，其特征在于，所述回油控制方法还包括：在步骤S200之后、步骤S300之前，关闭待机或关机室内机的室内节流元件。
  3. 根据权利要求1所述的回油控制方法，其特征在于，所述回油控制方法还包括：在步骤S200之后、步骤S300之前，关闭正常开机室内机的室内节流元件。
  4. 根据权利要求1所述的回油控制方法，其特征在于，所述回油控制方法还包括：在步骤S200之后、步骤S300之前，关闭待机或关机室内机的室内节流元件以及关闭正常开机室内机的室内节流元件。
  5. 根据权利要求1至4中任一项所述的回油控制方法，其特征在于，所述回油控制方法还包括：在步骤S100之后、步骤S200之前，调整所述室外机的压缩机的频率至预设的回油频率；
    其中，所述回油频率小于所述多联机空调系统在制冷或制热模式下所述压缩机的频率。
  6. 根据权利要求5所述的回油控制方法，其特征在于，所述回油控制方法通过下述方式确定所述多联机空调系统满足回油条件：
    启动所述多联机空调系统；
    开始计时；
    确定所述多联机空调系统的开机负荷档位；
    根据所述开机负荷档位来确定所述多联机空调系统满足回油条件所对应的运行时长；
    当所述多联机空调系统以当前开机负荷档位工作对应的运行时长后，则确定所述多联机空调系统满足回油条件。
  7. 根据权利要求5所述的回油控制方法，其特征在于，所述室外机包括方向控制元件，所述方向控制元件包括第一端口、第二端口、第三端口和第四端口，所述第一端口和所述压缩机的高压侧端口连通，所述第二端口和所述室外机的室外换热器的一端口连通，所述第三端口与每个所述室内机的室内换热器连通，所述第三端口与所述压缩机的低压侧端口连通；
    “调整冷媒流向以使所述多联机空调系统处于制冷模式”的步骤具体包括：
    导通所述第一端口和所述第二端口，并导通所述第三端口和所述第四端口。
  8. 根据权利要求7所述的回油控制方法，其特征在于，所述方向控制元件具体为四通阀。
  9. 根据权利要求7所述的回油控制方法，其特征在于，所述室内节流元件是电子膨胀阀。
  10. 根据权利要求1至4中任一项所述的回油控制方法，其特征在于，所述回油控制方法通过下述方式确定所述多联机空调系统满足回油条件：
    启动所述多联机空调系统；
    开始计时；
    确定所述多联机空调系统的开机负荷档位；
    根据所述开机负荷档位来确定所述多联机空调系统满足回油条件所对应的运行时长；
    当所述多联机空调系统以当前开机负荷档位工作对应的运行时长后，则确定所述多联机空调系统满足回油条件。
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CN111023272A (zh) * 2019-12-30 2020-04-17 宁波奥克斯电气股份有限公司 多联机空调系统的控制方法、装置和多联机空调系统
CN111141074A (zh) * 2020-01-06 2020-05-12 宁波奥克斯电气股份有限公司 一种空调的控制方法、装置、空调器及存储介质
CN112032827A (zh) * 2020-08-28 2020-12-04 青岛海尔空调电子有限公司 多联机空调系统的回油控制方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115264782A (zh) * 2022-08-01 2022-11-01 宁波奥克斯电气股份有限公司 空调回油控制方法、装置、多联机空调、存储介质
CN115325684A (zh) * 2022-09-13 2022-11-11 宁波奥克斯电气股份有限公司 一种多联机制冷控制方法、装置、多联机及可读存储介质

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