WO2024103793A1 - 空调系统及其控制方法 - Google Patents

空调系统及其控制方法 Download PDF

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Publication number
WO2024103793A1
WO2024103793A1 PCT/CN2023/105122 CN2023105122W WO2024103793A1 WO 2024103793 A1 WO2024103793 A1 WO 2024103793A1 CN 2023105122 W CN2023105122 W CN 2023105122W WO 2024103793 A1 WO2024103793 A1 WO 2024103793A1
Authority
WO
WIPO (PCT)
Prior art keywords
expansion valve
indoor
compressor
refrigerant
fan assembly
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2023/105122
Other languages
English (en)
French (fr)
Inventor
井旭
郭小惠
张恒
车闫瑾
刘心怡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Original Assignee
Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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
Application filed by Qingdao Hisense Hitachi Air Conditioning System Co Ltd filed Critical Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority to EP23890235.7A priority Critical patent/EP4592604A4/en
Publication of WO2024103793A1 publication Critical patent/WO2024103793A1/zh
Priority to US19/193,467 priority patent/US20250257894A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F24F11/62—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • 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
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • F24F2110/65—Concentration of specific substances or contaminants
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/029—Control issues
    • F25B2313/0293—Control issues related to the indoor fan, e.g. controlling speed
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
    • F25B2500/222—Detecting refrigerant leaks
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present disclosure relates to the technical field of air conditioning, and in particular to an air conditioning system and a control method thereof.
  • air conditioners Based on people's demand for perceived temperature comfort, air conditioners have entered thousands of households and become essential appliances in people's daily lives. During the operation of the air conditioner, refrigerant needs to circulate in the refrigerant circulation pipeline between the outdoor unit and the indoor unit.
  • an air conditioning system which includes an indoor unit, an outdoor unit, a first expansion valve, a second expansion valve and a controller.
  • the indoor unit includes an indoor heat exchanger and an indoor expansion valve.
  • the outdoor unit includes a compressor.
  • the indoor unit and the outdoor unit are connected via a refrigerant gas pipe and a refrigerant liquid pipe, respectively.
  • the first expansion valve is arranged on the refrigerant gas pipe between the indoor heat exchanger and the outdoor unit, and is configured to control the connection or disconnection of the refrigerant gas pipe between the indoor heat exchanger and the outdoor unit.
  • the second expansion valve is arranged on the refrigerant liquid pipe between the outdoor unit and the indoor expansion valve, and is configured to control the connection or disconnection of the refrigerant liquid pipe between the outdoor unit and the indoor expansion valve.
  • the controller is configured to: when obtaining information that the refrigerant is leaking indoors, control the air-conditioning system to switch to a cooling mode, and control the indoor expansion valve and the second expansion valve to be closed, and the first expansion valve to be opened; if it is determined that the compressor meets a first preset condition, control the compressor to stop, and close the first expansion valve; after controlling the compressor to stop, if it is determined that the refrigerant continues to leak indoors, start the compressor, and open the first expansion valve and the indoor expansion valve; if it is determined that the compressor meets the first preset condition, control the compressor to stop, and close the first expansion valve.
  • a control method of an air conditioning system includes an indoor unit, an outdoor unit, a first expansion valve, a second expansion valve, a refrigerant concentration sensor and a controller.
  • the indoor unit includes an indoor heat exchanger and an indoor expansion valve.
  • the outdoor unit includes a compressor.
  • the indoor unit and the outdoor unit are connected through a refrigerant gas pipe and a refrigerant liquid pipe respectively;
  • the first expansion valve is arranged on the refrigerant gas pipe between the indoor heat exchanger and the outdoor unit, and is configured to control the connection or disconnection of the refrigerant gas pipe between the indoor heat exchanger and the outdoor unit.
  • the second expansion valve is arranged on the refrigerant liquid pipe between the outdoor unit and the indoor expansion valve, and is configured to control the connection or disconnection of the refrigerant liquid pipe between the outdoor unit and the indoor expansion valve.
  • the refrigerant concentration sensor is configured to detect the refrigerant concentration in the room.
  • the controller is coupled to the indoor heat exchanger, the outdoor heat exchanger, the compressor, the first expansion valve, the second expansion valve and the refrigerant concentration sensor.
  • the control method includes: when obtaining information that the refrigerant is leaking indoors, controlling the air-conditioning system to switch to a cooling mode, and controlling the indoor expansion valve and the second expansion valve to be closed and the first expansion valve to be opened; if it is determined that the compressor meets a first preset condition, controlling the compressor to stop and closing the first expansion valve; after controlling the compressor to stop, if it is determined that the refrigerant continues to leak indoors, starting the compressor, and opening the first expansion valve and the indoor expansion valve; if it is determined that the compressor meets the first preset condition, controlling the compressor to stop and closing the first expansion valve; before obtaining information that the refrigerant is leaking indoors, the controller is also configured to: obtain the refrigerant concentrations in the room at the current moment and the previous moment, and if it is determined that the refrigerant concentration at the current moment is greater than the refrigerant concentration at the previous moment, confirming that the refrigerant is leaking indoors.
  • FIG1 is a perspective view of an air conditioning system according to some embodiments.
  • FIG2 is a schematic diagram of an air conditioning system according to some embodiments.
  • FIG3 is a block diagram of an air conditioning system according to some embodiments.
  • FIG4 is another schematic diagram of an air conditioning system according to some embodiments.
  • FIG5 is another block diagram of an air conditioning system according to some embodiments.
  • FIG6 is a cycle schematic diagram of an air conditioning system in a cooling mode according to some embodiments.
  • FIG7 is a flow chart of a refrigerant recovery method for an air conditioning system according to some embodiments.
  • FIG8 is a flow chart of another refrigerant recovery method for an air conditioning system according to some embodiments.
  • FIG9 is a flow chart of another refrigerant recovery method for an air-conditioning system according to some embodiments.
  • FIG10 is a schematic diagram of the opening and closing states of various components in an air conditioning system according to some embodiments.
  • FIG. 11 is a schematic diagram of the opening and closing states of components in another air-conditioning system 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 implicitly indicating the number of the indicated technical features.
  • a feature defined as “first” or “second” may explicitly or implicitly include one or more of the features.
  • plural means two or more.
  • connection can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium.
  • connection can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium.
  • coupled indicates, for example, that two or more components are in direct physical or electrical contact.
  • coupled or “communicatively coupled” may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other.
  • a and/or B includes the following three combinations: A only, B only, and a combination of A and B.
  • FIG. 1 is a three-dimensional diagram of an air conditioning system according to some embodiments.
  • the air conditioning system 100 includes an indoor unit 10 , an outdoor unit 20 , and a refrigerant pipeline 30 .
  • the refrigerant pipeline 30 may also be referred to as a circulation pipeline.
  • the refrigerant pipeline 30 connects the indoor unit 10 and the outdoor unit 20 to form a circulation loop.
  • FIG. 2 is a schematic diagram of an air conditioning system according to some embodiments. As shown in FIG. 2 , the air conditioning system 100 further includes a first expansion valve 101 and a second expansion valve 102 .
  • the indoor unit 10 , the second expansion valve 102 , the outdoor unit 20 and the first expansion valve 101 are sequentially connected in series via the refrigerant pipeline 30 .
  • the indoor unit 10 includes an indoor heat exchanger 11 and an indoor expansion valve 12 .
  • the first expansion valve 101 , the indoor heat exchanger 11 , the indoor expansion valve 12 , and the second expansion valve 102 are sequentially connected in series via the refrigerant pipeline 30 .
  • the outdoor unit 20 includes a four-way valve 21 , a compressor 22 , an outdoor heat exchanger 23 and an outdoor expansion valve 24 .
  • the compressor 22 includes an air intake port E and an air discharge port F.
  • the compressor 22 is configured to suck in low-temperature and low-pressure air from the air intake port E.
  • the gas phase refrigerant of the compressor 22 is driven by the motor to drive the piston to compress the gas phase refrigerant in the low temperature and low pressure state, and then discharge the high temperature and high pressure gas phase refrigerant through the exhaust port F.
  • the compressor 22 can provide power for the refrigeration cycle.
  • the air inlet E of the compressor 22 is the low pressure side
  • the exhaust port F of the compressor 22 is the high pressure side.
  • the indoor heat exchanger 11 performs heat exchange between indoor air and the refrigerant transmitted in the indoor heat exchanger 11 to liquefy or vaporize the refrigerant.
  • the outdoor heat exchanger 23 is configured to perform heat exchange between outdoor air and the refrigerant transmitted in the outdoor heat exchanger 23 to liquefy or vaporize the refrigerant.
  • the indoor expansion valve 12 and the outdoor expansion valve 24 are configured to adjust the flow rate of the refrigerant in the pipes of the air conditioning system 100 .
  • the compressor 22, the condenser (the indoor heat exchanger 11 or the outdoor heat exchanger 23), the expansion valve (the indoor expansion valve 12 and the outdoor expansion valve 24), and the evaporator (the outdoor heat exchanger 23 or the indoor heat exchanger 11) perform the refrigerant cycle of the air conditioning system 100.
  • the refrigerant cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and circulates and supplies the refrigerant to the conditioned side.
  • the four-way valve 21 includes a first port A, a second port B, a third port C and a fourth port D.
  • the first interface A of the four-way valve 21 is connected to the first expansion valve 101 , the second interface B is connected to the air intake port E of the compressor 22 , the third interface C is connected to the outdoor heat exchanger 23 , and the fourth interface D is connected to the air exhaust port F of the compressor 22 .
  • the refrigerant pipeline 30 includes a refrigerant gas pipe 31 and a refrigerant liquid pipe 32 , and the indoor unit 10 and the outdoor unit 20 are connected via the refrigerant gas pipe 31 and the refrigerant liquid pipe 32 , respectively.
  • the first expansion valve 101 is disposed on the refrigerant gas pipe 31 between the end of the indoor heat exchanger 11 away from the indoor expansion valve 12 and the outdoor unit 20, and is configured to open when the indoor refrigerant leaks, so that the refrigerant leaked from the indoor unit is recovered to the outdoor unit, and is closed after the refrigerant recovery is completed to prevent the refrigerant in the outdoor unit from flowing back to the indoor unit.
  • the second expansion valve 102 is disposed on the refrigerant liquid pipe 32 between the outdoor unit 20 and the indoor expansion valve 12, and is configured to close when the indoor refrigerant leaks, so as to prevent the refrigerant in the outdoor unit 20 from continuing to flow to the indoor unit 10, and to close the refrigerant liquid pipe between the second expansion valve 102 and the indoor expansion valve 12, so that the refrigerant is stored between the second expansion valve 102 and the indoor expansion valve 12.
  • the first expansion valve 101, the second expansion valve 102 and the indoor expansion valve 12 are electronic expansion valves.
  • the operation modes of the air conditioning system 100 include a cooling mode and a heating mode.
  • the air conditioning system 100 when the air conditioning system 100 operates in the heating mode, the first expansion valve 101, the indoor expansion valve 12, the second expansion valve 102, and the outdoor expansion valve 24 are opened, the first port A of the four-way valve 21 is connected to the fourth port D, and the second port B is connected to the third port C.
  • the indoor heat exchanger 11 acts as a condenser
  • the outdoor heat exchanger 23 acts as an evaporator.
  • the low-temperature and low-pressure gas-phase refrigerant is compressed by the compressor 22 and becomes a high-temperature and high-pressure gas-phase refrigerant.
  • the high-temperature and high-pressure gas-phase refrigerant flows into the indoor heat exchanger 11 through the four-way valve 21.
  • the indoor heat exchanger 11 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 during the condensation process.
  • the indoor expansion valve 12 and the outdoor expansion valve 24 throttle and reduce the pressure of the high-pressure liquid-phase refrigerant to become a low-pressure gas-liquid two-phase refrigerant.
  • the outdoor heat exchanger 23 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 22 through the four-way valve 21 to form a heating cycle.
  • FIG. 3 is a block diagram of an air conditioning system according to some embodiments. As shown in FIG. 3 , the air conditioning system 100 further includes a controller 40 .
  • the controller 40 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 conditioning system 100 to execute the control instruction.
  • the controller 40 is coupled to various components inside the air conditioning system 100 and is configured to control the operation of various components inside the air conditioning system 100 so that the various components of the air conditioning system 100 operate to realize various predetermined functions of the air conditioning system 100.
  • the controller 40 is configured to, if it is determined that the compressor 22 meets the first preset condition, control the compressor 22 to stop and close the first expansion valve 101; after controlling the compressor 22 to stop, determine whether the refrigerant continues to leak indoors, if it is no longer leaking, confirm that the leakage point is between the indoor expansion valve 12 and the first expansion valve 101, and the refrigerant at the leakage point has been recovered; if the refrigerant continues to leak, confirm that the leakage point is between the indoor expansion valve 12 and the second expansion valve 102, start the compressor 22, and open the first expansion valve 101 and the indoor expansion valve 12 to recover the refrigerant between the indoor expansion valve 12 and the second expansion valve 102, and if it is determined that the compressor 22 meets the first preset condition, control the compressor 22 to stop.
  • the machine is turned off and the first expansion valve 101 is closed, and the refrigerant recovery on the indoor unit 10 side is completed.
  • FIG4 is another schematic diagram of an air conditioning system according to some embodiments, which is different from the air conditioning system 100 in FIG2 .
  • the air conditioning system 100 further includes a first stop valve 51, a second stop valve 52, a first refrigerant concentration sensor 53, a second refrigerant concentration sensor 54, a first pressure sensor 55, a second pressure sensor 56, a third pressure sensor 57 and a temperature sensor 58.
  • the indoor unit 10 further includes an indoor fan assembly 13
  • the outdoor unit 20 further includes an outdoor fan assembly 25.
  • the first stop valve 51 is disposed on the refrigerant gas pipe 31 and is configured to control the connection or disconnection of the refrigerant gas pipe 31 .
  • the second stop valve 52 is disposed on the refrigerant liquid pipe 32 and is configured to control the connection or disconnection of the refrigerant liquid pipe 32 .
  • the first refrigerant concentration sensor 53 is disposed indoors and configured to detect the refrigerant concentration indoors.
  • the second refrigerant concentration sensor 54 is disposed in the indoor unit 10 and configured to detect the refrigerant concentration in the indoor unit 10 .
  • the first pressure sensor 55 is provided between the indoor expansion valve 12 and the second expansion valve 102, and is configured to detect the pressure value at the connecting pipe 70 between the indoor expansion valve 12 and the second expansion valve 102.
  • the second pressure sensor 56 is provided at the exhaust port F of the compressor 22, and is configured to detect the exhaust pressure value of the compressor 22.
  • the third pressure sensor 57 is provided at the intake port E of the compressor 22, and is configured to detect the intake pressure value of the compressor 22.
  • the temperature sensor 58 is disposed at the exhaust port F of the compressor 22 and is configured to detect a temperature value of the exhaust gas of the compressor 22 .
  • the indoor fan assembly 13 generates an airflow of indoor air passing through the indoor heat exchanger 11, and is configured to promote heat exchange between the refrigerant flowing in the heat transfer tube of the indoor heat exchanger 11 and the indoor air to assist in temperature regulation.
  • the outdoor fan assembly 25 generates an airflow of outdoor air passing through the outdoor heat exchanger 23, and is configured to promote heat exchange between the refrigerant flowing in the heat transfer tube of the outdoor heat exchanger 23 and the outdoor air.
  • FIG5 is another block diagram of an air conditioning system according to some embodiments, which is different from the air conditioning system 100 in FIG3 .
  • the air conditioning system 100 further includes a first stop valve 51, a second stop valve 52, a first refrigerant concentration sensor 53, a second refrigerant concentration sensor 54, a first pressure sensor 55, a second pressure sensor 56, a third pressure sensor 57 and a temperature sensor 58.
  • the indoor unit 10 further includes an indoor fan assembly 13
  • the outdoor unit 20 further includes an outdoor fan assembly 25.
  • the air conditioning system 100 further includes a memory 59 .
  • the memory 59 is coupled to the controller 40 .
  • the memory 59 is configured to store software programs and data.
  • the controller 40 executes various functions and data processing of the air conditioning system 100 by running the software programs or data stored in the memory 59.
  • the memory 59 in some embodiments of the present disclosure can store an operating system and various application programs, and can also store codes for executing a refrigerant recovery method of the air conditioning system 100 provided in some embodiments of the present disclosure.
  • the indoor unit 10 may further include a remote control device 62 (e.g., a remote controller), which is coupled to the controller 40.
  • the remote control device 62 has a function of communicating with the controller 40 using, for example, infrared rays or other communication methods.
  • the user may control the air conditioning system 100 through the remote control device 62, thereby realizing interaction between the user and the air conditioning system 100.
  • the air conditioning system 100 may further include: a communicator 63, which is electrically connected to the controller 40 and is used to establish a communication connection with the server.
  • the communicator 63 may include a radio frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, and a GPS module.
  • RF radio frequency
  • WIFI wireless fidelity
  • the air conditioning system 100 may also send its own operating data to the server through the communicator 63, so that the server can calculate the operating parameters of each component of the air conditioning system 100 during operation according to the data of the air conditioning system 100, and then send the calculated operating parameters to the air conditioning system 100.
  • the controller 40 controls each component in the air conditioning system 100 to operate according to the operating parameters calculated by the server.
  • FIG6 is a cycle schematic diagram of an air conditioning system in a cooling mode according to some embodiments.
  • the air conditioning system 100 operates in the cooling mode
  • the first expansion valve 101, the indoor expansion valve 12, the second expansion valve 102, and the outdoor expansion valve 24 are opened, the first interface A of the four-way valve 21 is connected to the second interface B, and the third interface C is connected to the fourth interface.
  • the outdoor heat exchanger 23 is connected to the port D.
  • the outdoor heat exchanger 23 acts as a condenser and the indoor heat exchanger 11 acts as an evaporator.
  • the outdoor heat exchanger 23 condenses the high-temperature and high-pressure gas phase refrigerant into a medium-temperature and high-pressure supercooled liquid phase refrigerant.
  • the second expansion valve 102 and the indoor expansion valve 12 convert the medium-temperature and high-pressure supercooled liquid refrigerant into a low-temperature and low-pressure gas-liquid two-phase refrigerant after throttling and reducing the pressure.
  • the indoor heat exchanger 11 absorbs heat from the surrounding environment and evaporates the low-temperature and 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 22 after passing through the four-way valve 21, forming a refrigeration cycle.
  • the arrows in FIG6 indicate the flow direction of the refrigerant when the air-conditioning system 100 is in the cooling mode.
  • refrigerant exists in the indoor unit 10, the outdoor unit 20 and the connecting pipe 70.
  • the connecting pipe 70 is long, when refrigerant leakage is detected indoors, it is necessary to recover all the refrigerant in the connecting pipe 70 and the indoor unit 10. Due to the large amount of refrigerant in the connecting pipe 70, it is sometimes impossible to completely recover the refrigerant. If the refrigerant in the connecting pipe 70 is not recovered in time and leaks from the connecting pipe 70 to the indoor side, it is easy to cause the indoor refrigerant concentration to be too high, and there is a flammable area, causing hidden dangers.
  • some embodiments of the present disclosure provide a refrigerant recovery method for an air-conditioning system, which is applied to a controller 40 .
  • FIG. 7 is a flow chart of a refrigerant recovery method for an air-conditioning system according to some embodiments. As shown in FIG. 7 , in some embodiments of the present disclosure, the method may include steps S101 to S107 .
  • the controller 40 When the controller 40 obtains the information of the refrigerant leakage indoors, it controls the air conditioning system 100 to be in the 0-point state shown in FIG. 10 , at which time, the indoor expansion valve 12 and the second expansion valve 102 are closed, and the compressor 22 and the first expansion valve 101 are opened.
  • the air-conditioning system 100 since the air-conditioning system 100 is operating in the cooling mode, the high-temperature and high-pressure gas-phase refrigerant flowing out of the compressor 22 can no longer flow to the indoor unit 10 side after flowing into the outdoor heat exchanger 23. Since the indoor expansion valve 12 and the second expansion valve 102 are both in the closed state, the refrigerant between the indoor expansion valve 12 and the second expansion valve 102 no longer flows at this time, and the refrigerant between the indoor expansion valve 12 and the first expansion valve 101 flows to the outdoor unit 20 side.
  • the controller 40 can adjust the opening of the indoor expansion valve 12 and the second expansion valve 102 to a fully closed state, that is, the opening of the indoor expansion valve 12 and the second expansion valve 102 are both 0pls. In this way, the refrigerant pipeline between the indoor expansion valve 12 and the second expansion valve 102 is a closed pipeline, and the refrigerant in the refrigerant pipeline between the indoor expansion valve 12 and the second expansion valve 102 can be stored.
  • pls is the abbreviation of pulse, which refers to pulse and is the unit of opening of the electronic expansion valve.
  • the controller 40 can, for example, adjust the opening of the first expansion valve 101 to a fully open state, so that the refrigerant flow area in the refrigerant gas pipe 31 can be maximized, the refrigerant can be recovered as quickly as possible, and the time for refrigerant recovery can be reduced.
  • the controller 40 when the controller 40 controls the indoor expansion valve 12 and the second expansion valve 102 to be closed, it can also control the indoor fan assembly 13 to be opened, so as to evaporate the liquid refrigerant on the indoor unit 10 side into the gaseous refrigerant as much as possible, so as to avoid the liquid refrigerant from entering the compressor and causing liquid hammer (i.e., the liquid refrigerant is not fully evaporated in the outdoor unit 20, resulting in the unevaporated liquid refrigerant flowing into the compressor 22), which affects the reliability of the compressor 22.
  • liquid hammer i.e., the liquid refrigerant is not fully evaporated in the outdoor unit 20, resulting in the unevaporated liquid refrigerant flowing into the compressor 22
  • the heat exchange efficiency between the indoor heat exchanger 11 and the indoor air can be improved, thereby increasing the refrigerant flow rate between the indoor heat exchanger 11 and the indoor expansion valve 12, reducing the time for refrigerant recovery, and thus reducing the amount of refrigerant leakage.
  • the controller 40 can control the indoor fan assembly 13 to operate at a first preset gear, which is a gear pre-set by the air conditioning system 100.
  • the first preset gear is, for example, the highest gear that the indoor fan assembly 13 can reach, that is, the gear at which the indoor fan assembly 13 outputs the most air per unit time.
  • the outdoor fan assembly 25 can also be controlled to open so that the refrigerant recovered in the refrigerant gas pipe 31 between the compressor 22 and the outdoor heat exchanger 23 flows to the refrigerant liquid pipe 32 between the outdoor heat exchanger 23 and the second expansion valve 102 .
  • the controller 40 can control the outdoor fan assembly 25 to operate at a second preset gear, and the second preset gear is a gear pre-set by the air conditioning system 100.
  • the second preset gear is, for example, the highest gear that the outdoor fan assembly 25 can reach, that is, the gear at which the outdoor fan assembly 25 outputs the most air per unit time.
  • the heat exchange efficiency between the outdoor heat exchanger 23 and the outdoor air is improved, the speed at which the gas phase refrigerant condenses into the liquid phase refrigerant in the outdoor heat exchanger 23 can be accelerated, and the refrigerant pipeline between the compressor 22 and the outdoor heat exchanger 23 can be prevented from having excessive pressure changes when the refrigerant is recovered, thereby ensuring the normal operation of the air conditioning system 100.
  • the controller 40 determines that the refrigerant in the indoor unit 10 flows into the outdoor unit 20 through the refrigerant gas pipe 31 at this time, and the refrigerant recovery can be ended. At this time, the controller 40 controls the air-conditioning system 100 to be in the point M state in Figure 10. At this time, the indoor expansion valve 12 and the second expansion valve 102 are still in the closed state. The controller 40 controls the compressor 22 to stop and closes the first expansion valve 101 to disconnect the connection between the indoor unit 10 and the outdoor unit 20, thereby preventing the refrigerant on the outdoor unit 20 side from flowing back to the indoor unit 10 side through the refrigerant gas pipe 31.
  • the controller 40 can adjust the first expansion valve 101 to a fully closed state, that is, adjust the opening degree of the first expansion valve 101 to 0Pls.
  • the first preset condition may include at least one of the following:
  • the running time of the compressor 22 after switching to the cooling mode is greater than the preset time.
  • the preset time is the operation time of the compressor 22 switching to the cooling mode when the refrigerant in the indoor unit 10 flows into the outdoor unit 20 and the refrigerant content in the indoor unit 10 is lower than the first preset threshold.
  • the preset time is a preset time, such as 20 minutes, 25 minutes, etc.
  • the controller 40 determines that the operating time after the compressor 22 switches to the cooling mode is greater than the preset time, it can be determined that the refrigerant in the indoor unit 10 flows into the outdoor unit 20 through the refrigerant gas pipe 31 at this time, and the refrigerant recovery is ended.
  • the controller 40 controls the compressor 22 to stop running and closes the first expansion valve 101 .
  • the controller 40 will switch the operating mode of the air-conditioning system 100 to the cooling mode. If it is determined that the air-conditioning system 100 was operating in the cooling mode before the refrigerant leakage, the controller 40 does not need to switch the operating mode of the air-conditioning system 100.
  • the exhaust pressure value of the compressor 22 is greater than the first preset value.
  • the first preset value is the exhaust pressure value of the compressor 22 when the refrigerant in the indoor unit 10 flows into the outdoor unit 20 and the refrigerant content in the indoor unit 10 is lower than the first preset threshold.
  • the first preset value is a preset value, such as 3.7Mpa, 3.8Mpa, etc.
  • controller 40 determines that the exhaust pressure value of the compressor 22 is greater than the first preset value, it can be determined that the refrigerant in the indoor unit 10 flows into the outdoor unit 20 through the refrigerant gas pipe 31, and the refrigerant recovery ends.
  • the controller 40 controls the compressor 22 to stop running and closes the first expansion valve 101 .
  • the exhaust temperature of the compressor 22 is greater than the second preset value.
  • the second preset value is the exhaust temperature value of the compressor 22 when the refrigerant in the indoor unit 10 flows into the outdoor unit 20 and the refrigerant content in the indoor unit 10 is lower than the first preset threshold.
  • the second preset value is a preset value, such as 105°C, 100°C, etc.
  • the controller 40 determines that the exhaust temperature of the compressor 22 is greater than the second preset value, it can be determined that the refrigerant in the indoor unit 10 flows into the outdoor unit 20 through the refrigerant gas pipe 31, and the refrigerant recovery ends. For example, if the second preset value is 105°C and the (current) exhaust temperature of the compressor 22 is 108°C, the controller 40 controls the compressor 22 to stop running and closes the first preset value. An expansion valve 101.
  • the suction pressure value of the compressor 22 is less than the third preset value.
  • the third preset value is the suction pressure value of the compressor 22 when the refrigerant in the indoor unit 10 flows into the outdoor unit 20 and the refrigerant content in the indoor unit 10 is lower than the first preset threshold.
  • the third preset value is a preset value, such as 0.1Mpa, 0.08Mpa, etc.
  • controller 40 determines that the suction pressure value of the compressor 22 is less than the third preset value, it can be determined that the refrigerant in the indoor unit 10 flows into the outdoor unit 20 through the refrigerant gas pipe 31, and the refrigerant recovery ends.
  • the third preset value may be 0.1 MPa, and the (current) suction pressure value of the compressor 22 is 0.08 MPa, then the controller 40 controls the compressor 22 to stop running and closes the first expansion valve 101 .
  • refrigerant recovery can be terminated when the first preset condition satisfies at least one of the above four judgment conditions.
  • the present disclosure does not limit the execution order of the four judgment conditions. Whether the corresponding judgment condition can be executed depends on the operating status of the air-conditioning system 100.
  • the preset time, the first preset value, the second preset value, and the third preset value can also be obtained through experiments.
  • the controller 40 after controlling the compressor 22 to stop, the controller 40 also controls the outdoor fan assembly 25 to turn off. In this way, the energy consumption of the air conditioning system 100 can be saved.
  • the controller 40 after controlling the compressor 22 to stop, the controller 40 also controls the indoor fan assembly 13 to turn off. In this way, the energy consumption of the air conditioning system 100 can be saved.
  • S104 may further include: the controller 40 obtains the indoor refrigerant concentration through the first refrigerant concentration sensor 53, and determines whether the indoor refrigerant concentration at the current moment is greater than the indoor refrigerant concentration at the previous moment.
  • the change in the indoor refrigerant concentration can indicate whether the refrigerant continues to leak indoors. For example, if the indoor refrigerant concentration at the current moment is greater than the indoor refrigerant concentration at the previous moment, it indicates that the refrigerant continues to leak indoors; if the indoor refrigerant concentration at the current moment is less than or equal to the indoor refrigerant concentration at the previous moment, it indicates that the refrigerant is no longer leaking indoors.
  • S104 includes: the controller 40 obtains the pressure values at the current moment and the previous moment at the connecting pipe 70 between the indoor expansion valve 12 and the second expansion valve 102 through the first pressure sensor 55, and determines whether the pressure value at the connecting pipe 70 at the current moment is less than the pressure value at the previous moment.
  • the refrigerant content in the refrigerant pipeline between the indoor expansion valve 12 and the first expansion valve 101 is lower than the first preset threshold value. If the refrigerant continues to leak indoors, the leakage point is located at the connecting pipe 70.
  • the change in the pressure value at the connecting pipe 70 can represent the change in the refrigerant concentration at the connecting pipe 70.
  • the controller 40 determines whether the refrigerant continues to leak indoors by determining whether the refrigerant concentration at the connecting pipe 70 changes.
  • the refrigerant concentration at the connecting pipe 70 increases, it indicates that the refrigerant continues to leak at the connecting pipe 70 ; if the refrigerant concentration at the connecting pipe 70 decreases, it indicates that the refrigerant has stopped leaking at the connecting pipe 70 .
  • the controller 40 determines that the refrigerant continues to leak indoors, it can be determined that the refrigerant leakage point is located at the connecting pipe 70 between the indoor expansion valve 12 and the second expansion valve 102.
  • the controller 40 controls the air conditioning system 100 to be in the N2 point state shown in Figure 11.
  • the second expansion valve 102 is in a closed state.
  • the controller 40 starts the compressor 22, and opens the first expansion valve 101 and the indoor expansion valve 12, and recycles the refrigerant at the connecting pipe 70 to the outdoor unit 20 side through the indoor expansion valve 12 and the first expansion valve 101.
  • the controller 40 can adjust the opening of the first expansion valve 101 to a fully open state, so that the refrigerant pipeline has a better flow capacity.
  • the controller 40 can gradually increase the frequency of the compressor 22 until the operating frequency of the compressor 22 reaches the preset operating frequency, and the compressor 22 continues to operate at the preset operating frequency.
  • the operation of the compressor 22 is stable, and the service life of the compressor 22 can be extended.
  • the controller 40 controls the superheat of the indoor unit 10 by adjusting the opening of the indoor expansion valve 12 .
  • the indoor unit 10 always ensures a preset superheat to prevent the compressor 22 from having a liquid backflow problem.
  • superheat refers to the difference between the actual temperature of the refrigerant at the evaporator outlet and the saturation temperature corresponding to the refrigerant pressure there, that is, the difference between the evaporator outlet temperature and the evaporation temperature.
  • the opening of the indoor expansion valve 12 is less than the maximum opening. For example, if the maximum opening of the indoor expansion valve 12 is 200Pls, the opening of the indoor expansion valve 12 in the cooling mode is 10% of the maximum opening of the expansion valve, that is, the opening of the indoor expansion valve 12 is 20Pls. At this time, compared with the fully open state, the flow area of the refrigerant pipeline is reduced, and the amount of refrigerant flowing into the indoor unit 10 from the connecting pipe 70 is reduced.
  • the opening of the indoor expansion valve 12 should not be greater than the first preset opening, and in order to ensure that the internal refrigerant at the connecting pipe 70 is recovered quickly, the opening of the indoor expansion valve 12 should not be less than the second preset opening.
  • the first preset opening refers to the opening of the indoor expansion valve 12 that causes the liquid phase refrigerant to enter the compressor 22 without sufficient evaporation
  • the second preset opening refers to the opening of the indoor expansion valve 12 that affects the refrigerant recovery rate at the connecting pipe 70
  • the first preset opening is less than the second preset opening.
  • the controller 40 may also adjust the opening of the indoor expansion valve 12 to a preset target opening according to the suction pressure value of the compressor 22 .
  • the suction pressure value of the compressor 22 when the suction pressure value of the compressor 22 is higher than the preset suction pressure value, the amount of refrigerant in the indoor unit 10 is large, and the opening of the indoor expansion valve 12 remains unchanged; when the suction pressure decreases, the amount of refrigerant retained in the indoor unit 10 is small, and the controller 40 increases the opening of the indoor expansion valve 12.
  • the memory 59 stores the corresponding relationship between the suction pressure value of the compressor 22 and the preset target opening of the indoor expansion valve 12. In some embodiments of the present disclosure, the suction pressure value of the compressor 22 may be negatively correlated with the preset target opening of the indoor expansion valve 12.
  • the corresponding relationship between the suction pressure value of the compressor 22 and the preset target opening degree of the indoor expansion valve 12 may be as shown in Table 1.
  • the controller 40 obtains the suction pressure value of the compressor 22 through the third pressure sensor 57, obtains the corresponding preset target opening of the indoor expansion valve 12 from the memory 59 according to the suction pressure value, and controls the indoor expansion valve 12 to adjust to the preset target opening.
  • the controller 40 obtains the suction pressure value of the compressor 22 as 0.5Mpa through the third pressure sensor 57, according to Table 1, the controller 40 adjusts the opening of the first expansion valve 101 to 800pls, increases the pipeline flow area, and replenishes the refrigerant retention in the connecting pipe 70 to the indoor unit 10, and then sucks it into the outdoor unit 20 by the compressor 22; after a period of time, the controller 40 obtains the suction pressure value of the compressor 22 through the third pressure sensor 57 to 0.49Mpa, and according to Table 1, adjusts the opening of the first expansion valve 101 to 1100Pls.
  • the controller 40 gradually increases the opening of the indoor expansion valve 12 until the opening of the indoor expansion valve 12 reaches a preset target opening.
  • the controller 40 may open the indoor expansion valve 12 at a speed of 20Pls/s. Increase the opening of the indoor expansion valve 12, and the adjustment time is 10s.
  • the controller 40 can also control the indoor fan assembly 13 to open to prevent liquid refrigerant from entering the compressor 22 and causing liquid hammer problems, thereby affecting the reliability of the compressor 22.
  • the controller 40 may control the indoor fan assembly 13 to operate at a first preset gear.
  • the controller 40 can also control the outdoor fan assembly 25 to open, so that the refrigerant recovered in the refrigerant gas pipe 31 between the compressor 22 and the outdoor heat exchanger 23 flows to the refrigerant liquid pipe 32 between the outdoor heat exchanger 23 and the second expansion valve 102.
  • the controller 40 may control the outdoor fan assembly 25 to operate at a second preset gear.
  • the controller 40 starts the compressor 22 and opens the first expansion valve 101 and the indoor expansion valve 12 to recover the refrigerant in the refrigerant gas pipe 31 on the indoor unit 10 side to the outdoor unit 20.
  • the compressor 22 meets the first preset condition, it means that the refrigerant in the refrigerant gas pipe 31 on the indoor unit 10 side is completely recovered.
  • the controller 40 controls the compressor 22 to stop; and closes the first expansion valve 101 to prevent the refrigerant on the outdoor unit 20 side from flowing back to the indoor unit 10 side.
  • controller 40 controls the compressor 22 to stop, it also controls the outdoor fan assembly 25 and the indoor fan assembly 13 to turn off.
  • the controller 40 controls the air conditioning system 100 to be in the state of point N1 in FIG. 10 or point P in FIG. 11 .
  • the compressor 22 , the first expansion valve 101 , the indoor expansion valve 12 and the second expansion valve 102 are all in the closed state.
  • the operation mode of the air conditioning system 100 may be a heating mode, etc.
  • FIG8 is a flow chart of another refrigerant recovery method for an air conditioning system according to some embodiments. As shown in FIG8 , S101 may also include S1011 to S1013.
  • the controller 40 may obtain operating parameter information of the air-conditioning system 100 , such as obtaining the current operating mode of the air-conditioning system 100 , so as to determine whether the air-conditioning system 100 is currently operating in a cooling mode.
  • the controller 40 may also determine the current operation mode by obtaining the connection status of the four interfaces of the four-way valve 21 and the operating frequency of the compressor 22, thereby determining whether the current air-conditioning system 100 is operating in the cooling mode. For example, when the controller 40 obtains that the first interface A of the four-way valve 21 is connected to the second interface B, and the third interface C is connected to the fourth interface D, it can be determined that the air-conditioning system 100 is operating in the cooling mode; when the controller 40 obtains that the first interface A of the four-way valve 21 is connected to the fourth interface D, and the second interface B is connected to the third interface C, it can be determined that the air-conditioning system 100 is operating in the heating mode.
  • the controller 40 controls the air conditioning system 100 to stop operating in the current operation mode.
  • S1013 Control the air conditioning system 100 to operate in cooling mode.
  • the controller 40 determines that the air-conditioning system 100 is operating in cooling mode, there is no need to change the current operating mode of the air-conditioning system 100; when the controller 40 determines that the air-conditioning system 100 is operating in non-cooling mode, the air-conditioning system 100 is controlled to adjust the operating mode to cooling mode.
  • FIG. 9 is a flow chart of another refrigerant recovery method for an air-conditioning system according to some embodiments. As shown in FIG. 9 , before step S101 , the refrigerant recovery method for the air-conditioning system 100 may further include step S100 .
  • the controller 40 obtains the indoor refrigerant concentration through the first refrigerant concentration sensor 53, and determines whether the indoor refrigerant concentration at the current moment is greater than the indoor refrigerant concentration at the previous moment.
  • the indoor refrigerant concentration at the current moment is greater than the indoor refrigerant concentration at the previous moment, it indicates that the refrigerant is leaking indoors; if it is determined that the indoor refrigerant concentration at the current moment is less than or equal to the indoor refrigerant concentration at the previous moment, it indicates that the refrigerant is not leaking indoors.
  • the controller 40 obtains the indoor refrigerant concentration according to the refrigerant concentration sensor 54 at a preset time interval, and the interval between the current moment and the previous moment is the preset time interval.
  • the preset time interval can be 5s, 10s, 30s, etc., which is not limited by the present disclosure.
  • the controller 40 obtains the indoor refrigerant concentration every 30 seconds. It is understandable that if the refrigerant concentration at the current moment is less than or equal to the refrigerant concentration at the previous moment, the controller 40 does not perform any action and can continue to obtain the indoor refrigerant concentration at the current moment and the previous moment.
  • the controller 40 can obtain the information of the refrigerant leakage in the room in time, and recycle the refrigerant in time to reduce the leakage of the refrigerant in the room.
  • FIG10 is a diagram of the opening and closing states of various components in an air conditioning system according to some embodiments.
  • the controller 40 controls the compressor 22, the first expansion valve 101, the indoor expansion valve 12, and the second expansion valve 102 to be in the 0-point state.
  • the compressor 22 is in the open state
  • the first expansion valve 101 is in the open state
  • the indoor expansion valve 12 is in the closed state
  • the second expansion valve 102 is in the closed state, so that the refrigerant leaked from the indoor unit 10 begins to be recovered to the outdoor unit 20.
  • the controller 40 controls the compressor 22, the first expansion valve 101, the indoor expansion valve 12, and the second expansion valve 102 to be in the M-point state.
  • the compressor 22 is in the closed state
  • the first expansion valve 101 is in the closed state
  • the indoor expansion valve 12 is in the closed state
  • the second expansion valve 102 is in the closed state.
  • the controller 40 determines that the refrigerant is no longer leaking indoors, it indicates that the refrigerant leakage is located at the indoor unit 10, and the leaked refrigerant in the indoor unit 10 has been recovered.
  • the controller 40 controls the compressor 22, the first expansion valve 101, the indoor expansion valve 12 and the second expansion valve 102 to be in the N1 point state. At this time, the compressor 22 is in the closed state, the first expansion valve 101 is in the closed state, the indoor expansion valve 12 is in the closed state, and the second expansion valve 102 is in the closed state.
  • FIG. 11 is an opening and closing state diagram of each component in another air-conditioning system according to some embodiments.
  • the meanings of point 0 and point M in FIG. 11 are the same as those of point 0 and point M in FIG. 10, and are not repeated here.
  • the controller 40 determines that the refrigerant continues to leak indoors, indicating that the refrigerant leak is located at the connecting pipe 70, and the controller 40 controls the compressor 22, the first expansion valve 101, the indoor expansion valve 12, and the second expansion valve 102 to be in the N2 point state.
  • the compressor 22 is in the open state, the first expansion valve 101 is in the open state, the indoor expansion valve 12 is in the open state, and the second expansion valve 102 is in the closed state, and the refrigerant at the connecting pipe 70 is recovered.
  • the controller 40 controls the compressor 22, the first expansion valve 101, the indoor expansion valve 12, and the second expansion valve 102 to be in the P point state.
  • the refrigerant recovery at the connecting pipe 70 is completed, and the compressor 22, the first expansion valve 101, the indoor expansion valve 12, and the second expansion valve 102 are all in the closed state.
  • the indoor expansion valve 12 may also be in an open state at point P.

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Abstract

一种空调系统（100）及其控制方法，空调系统（100）包括室内机（10）、室外机（20）、第一膨胀阀（101）、第二膨胀阀（102）和控制器（40）。室内机（10）包括室内换热器（11）和室内膨胀阀（12）。室外机（20）包括压缩机（22）。第一膨胀阀（101）被配置为控制冷媒气管（31）的连通或断开。第二膨胀阀（102）被配置为控制冷媒液管（32）的连通或断开。控制器（40）被配置为在获取冷媒在室内泄露时，控制空调系统（100）切换至制冷模式，控制室内膨胀阀（12）和第二膨胀阀（102）关闭、第一膨胀阀（101）打开；若确定压缩机（22）满足第一预设条件，则控制压缩机（22）停机并关闭第一膨胀阀（101）；在控制压缩机（22）停机之后，若确定冷媒在室内继续泄露，则启动压缩机（22）并开启第一膨胀阀（101）和室内膨胀阀（12）；若确定压缩机（22）满足第一预设条件，则控制压缩机（22）停机、关闭第一膨胀阀（101）。

Description

空调系统及其控制方法
本申请要求于2022年11月14日提交的、申请号为202211427196.3的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及空气调节技术领域，尤其涉及一种空调系统及其控制方法。
背景技术
基于人们对于体感温度舒适度的需求，空调器已经走进了千家万户，成为人们日常生活中必备的电器。空调器在运行过程中需要冷媒在室外机和室内机之间的冷媒循环管路中进行循环。
发明内容
一方面，提供一种空调系统，所述空调系统包括室内机、室外机、第一膨胀阀、第二膨胀阀和控制器。所述室内机包括室内换热器和室内膨胀阀。所述室外机包括压缩机。所述室内机与所述室外机之间分别通过冷媒气管和冷媒液管连接。所述第一膨胀阀设置于所述室内换热器和所述室外机之间的所述冷媒气管上，被配置为控制所述室内换热器和所述室外机之间的所述冷媒气管的连通或断开。所述第二膨胀阀设置于所述室外机和所述室内膨胀阀之间的所述冷媒液管上，被配置为控制所述室外机和所述室内膨胀阀之间的所述冷媒液管的连通或断开。所述控制器被配置为：在获取到冷媒在室内泄露的信息时，控制所述空调系统切换至制冷模式，且控制所述室内膨胀阀和所述第二膨胀阀关闭、所述第一膨胀阀打开；若确定所述压缩机满足第一预设条件，则控制所述压缩机停机、且关闭所述第一膨胀阀；在控制所述压缩机停机之后，若确定所述冷媒在室内继续泄露，则启动所述压缩机，并且开启所述第一膨胀阀和所述室内膨胀阀；若确定所述压缩机满足所述第一预设条件，则控制所述压缩机停机、且关闭所述第一膨胀阀。
另一方面，提供一种空调系统的控制方法，其中，所述空调系统包括室内机、室外机、第一膨胀阀、第二膨胀阀、冷媒浓度传感器和控制器。所述室内机包括室内换热器和室内膨胀阀。所述室外机包括压缩机。所述室内机与所述室外机之间分别通过冷媒气管和冷媒液管连接；所述第一膨胀阀设置于所述室内换热器和所述室外机之间的所述冷媒气管上，被配置为控制所述室内换热器和所述室外机之间的所述冷媒气管的连通或断开。所述第二膨胀阀设置于所述室外机和所述室内膨胀阀之间的所述冷媒液管上，被配置为控制所述室外机和所述室内膨胀阀之间的所述冷媒液管的连通或断开。所述冷媒浓度传感器，被配置为检测室内的冷媒浓度。所述控制器与所述室内换热器、所述室外换热器、所述压缩机、所述第一膨胀阀、所述第二膨胀阀和所述冷媒浓度传感器耦接。
所述控制方法包括：在获取到冷媒在室内泄露的信息时，控制所述空调系统切换至制冷模式，且控制所述室内膨胀阀和所述第二膨胀阀均关闭、所述第一膨胀阀打开；若确定所述压缩机满足第一预设条件，则控制所述压缩机停机、且关闭所述第一膨胀阀；在控制所述压缩机停机之后，若确定所述冷媒在室内继续泄露，则启动所述压缩机，并且开启所述第一膨胀阀和所述室内膨胀阀；若确定所述压缩机满足所述第一预设条件，则控制所述压缩机停机、且关闭所述第一膨胀阀；所述在获取到冷媒在室内泄露的信息之前，所述控制器还被配置为：获取室内在当前时刻和前一时刻的冷媒浓度，若确定当前时刻的冷媒浓度大于前一时刻的冷媒浓度，则确认冷媒在室内泄露。
附图说明
图1为根据一些实施例的空调系统的一种立体图；
图2为根据一些实施例的空调系统的一种示意图；
图3为根据一些实施例的空调系统的一种框图；
图4为根据一些实施例的空调系统的另一种示意图；
图5为根据一些实施例的空调系统的另一种框图；
图6为根据一些实施例的空调系统在制冷模式下的一种循环原理图；
图7为根据一些实施例的空调系统的一种冷媒回收方法的流程图；
图8为根据一些实施例的空调系统的另一种冷媒回收方法的流程图；
图9为根据一些实施例的空调系统的又一种冷媒回收方法的流程图；
图10为根据一些实施例的一种空调系统中各部件的开闭状态示意图；
图11为根据一些实施例的另一种空调系统中各部件的开闭状态示意图。
具体实施方式
下面将结合附图，对本公开的一些实施例进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开所提供的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本公开保护的范围。
除非上下文另有要求，否则，在整个说明书和权利要求书中，术语“包括(comprise)”及其其他形式例如第三人称单数形式“包括(comprises)”和现在分词形式“包括(comprising)”被解释为开放、包含的意思，即为“包含，但不限于”。在说明书的描述中，术语“一个实施例(one embodiment)”、“一些实施例(some embodiments)”、“示例性实施例(exemplary embodiments)”、“示例(example)”、“特定示例(specific example)”或“一些示例(some examples)”等旨在表明与该实施例或示例相关的特定特征、结构、材料或特性包括在本公开的至少一个实施例或示例中。上述术语的示意性表示不一定是指同一实施例或示例。此外，所述的特定特征、结构、材料或特点可以以任何适当方式包括在任何一个或多个实施例或示例中。
以下，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本公开实施例的描述中，除非另有说明，“多个”的含义是两个或两个以上。
在描述一些实施例时，可能使用了“耦接”和“连接”及其衍伸的表达。术语“连接”应做广义理解，例如，“连接”可以是固定连接，也可以是可拆卸连接，或成一体；可以是直接相连，也可以通过中间媒介间接相连。术语“耦接”例如表明两个或两个以上部件有直接物理接触或电接触。术语“耦接”或“通信耦合(communicatively coupled)”也可能指两个或两个以上部件彼此间并无直接接触，但仍彼此协作或相互作用。这里所公开的实施例并不必然限制于本文内容。
“A和/或B”，包括以下三种组合：仅A，仅B，及A和B的组合。
本文中“适用于”或“被配置为”的使用意味着开放和包容性的语言，其不排除适用于或被配置为执行额外任务或步骤的设备。
另外，“基于”的使用意味着开放和包容性，因为“基于”一个或多个所述条件或值的过程、步骤、计算或其他动作在实践中可以基于额外条件或超出所述的值。
图1为根据一些实施例的空调系统的一种立体图，如图1所示，空调系统100包括：室内机10、室外机20、冷媒管路30。
冷媒管路30还可称为循环管路，冷媒管路30将室内机10和室外机20连通，以构成循环回路。
图2为根据一些实施例的空调系统的一种示意图，如图2所示，空调系统100还包括第一膨胀阀101和第二膨胀阀102。
室内机10、第二膨胀阀102、室外机20和第一膨胀阀101通过冷媒管路30依次串联连通。
室内机10包括：室内换热器11和室内膨胀阀12。
第一膨胀阀101、室内换热器11、室内膨胀阀12和第二膨胀阀102通过冷媒管路30依次串联连通。
室外机20包括：四通阀21、压缩机22、室外换热器23和室外膨胀阀24。
压缩机22包括吸气口E和排气口F。压缩机22被配置为从吸气口E处吸入低温低压 的气相冷媒，通过电机运转带动活塞对低温低压状态的气相冷媒进行压缩后，通过排气口F排出高温高压的气相冷媒，这样，压缩机22可以为制冷循环提供动力。可以理解的是，压缩机22的吸气口E处为低压侧，压缩机22的排气口F处为高压侧。
室内换热器11通过将室内空气与在室内换热器11中传输的冷媒进行热交换，以对冷媒进行液化或汽化中的一种。室外换热器23被配置为通过将室外空气与在室外换热器23中传输的冷媒进行热交换，以对冷媒进行液化或汽化中的另一种。
室内膨胀阀12和室外膨胀阀24被配置为调节空调系统100的管路内的冷媒流量。
压缩机22、冷凝器(室内换热器11或室外换热器23)、膨胀阀(室内膨胀阀12和室外膨胀阀24)和蒸发器(室外换热器23或室内换热器11)来执行空调系统100的冷媒循环。冷媒循环包括一系列过程，涉及压缩、冷凝、膨胀和蒸发，并向被调节侧循环供应冷媒。
四通阀21包括第一接口A、第二接口B、第三接口C和第四接口D。
四通阀21的第一接口A与第一膨胀阀101连通，第二接口B与压缩机22的吸气口E连通，第三接口C与室外换热器23连通，第四接口D与压缩机22的排气口F连通。
冷媒管路30包括冷媒气管31和冷媒液管32，室内机10和室外机20之间分别通过冷媒气管31和冷媒液管32连接。
第一膨胀阀101设置于室内换热器11的远离室内膨胀阀12的一端和室外机20之间的冷媒气管31上，被配置为在室内冷媒泄露时打开，以使室内机泄漏的冷媒回收至室外机，且在冷媒回收结束后关闭，以阻止室外机中的冷媒回流至室内机。第二膨胀阀102设置于室外机20和室内膨胀阀12之间的冷媒液管32上，被配置为在室内冷媒泄露时关闭，以阻止室外机20的冷媒继续流向室内机10，且使第二膨胀阀102与室内膨胀阀12之间的冷媒液管封闭，使冷媒存储在第二膨胀阀102与室内膨胀阀12之间。在本公开一些实施例中，第一膨胀阀101、第二膨胀阀102和室内膨胀阀12为电子膨胀阀。
在本公开一些实施例中，空调系统100的运行模式包括制冷模式和制热模式。
例如，当空调系统100运行在制热模式时，第一膨胀阀101、室内膨胀阀12、第二膨胀阀102、室外膨胀阀24打开，四通阀21的第一接口A与第四接口D连通，第二接口B与第三接口C连通。此时，室内换热器11作为冷凝器，室外换热器23作为蒸发器。
低温低压状态的气相冷媒经压缩机22压缩后变为高温高压的气相冷媒，高温高压的气相冷媒通过四通阀21流入室内换热器11。室内换热器11将高温高压的气相冷媒冷凝成高压状态的液相冷媒，热量随着冷凝过程释放到周围环境。室内膨胀阀12和室外膨胀阀24将高压状态的液相冷媒节流降压之后变成低压状态的气液两相态冷媒，室外换热器23从周围环境中吸取热量并将低压状态的气液两相态冷媒蒸发形成低温低压的气相冷媒，低温低压状态的气相冷媒经四通阀21返回到压缩机22中，形成制热循环。
图3为根据一些实施例的空调系统的一种框图，如图3所示，空调系统100还包括控制器40。
在本公开一些实施例中，控制器40是指可以根据指令操作码和时序信号，产生操作控制信号，指示空调系统100执行控制指令的装置。控制器40与空调系统100内部的各部件耦接，被配置为控制空调系统100内部中各部件工作，使得空调系统100各个部件运行实现空调系统100的各预定功能。
例如，控制器40被配置为若确定压缩机22满足第一预设条件，则控制压缩机22停机且关闭第一膨胀阀101；在控制压缩机22停机之后，判断冷媒在室内是否继续泄露，若不再泄露，则确认泄露点位于室内膨胀阀12与第一膨胀阀101之间，此时该泄露点处的冷媒已经回收；若冷媒继续泄露，则确认泄露点位于室内膨胀阀12与第二膨胀阀102之间，启动压缩机22，并且开启第一膨胀阀101和室内膨胀阀12，将室内膨胀阀12与第二膨胀阀102之间的冷媒回收，若确定压缩机22满足第一预设条件，则控制压缩机22停 机，且关闭第一膨胀阀101，室内机10侧的冷媒回收完成。
图4为根据一些实施例的空调系统的另一种示意图，区别于图2中的空调系统100，如图4所示，空调系统100还包括第一截止阀51、第二截止阀52、第一冷媒浓度传感器53、第二冷媒浓度传感器54、第一压力传感器55、第二压力传感器56、第三压力传感器57和温度传感器58。室内机10还包括室内风机组件13，室外机20还包括室外风机组件25。
第一截止阀51设置在冷媒气管31上，被配置为控制冷媒气管31的连通或断开，第二截止阀52设置在冷媒液管32上，被配置为控制冷媒液管32的连通或断开。
在本公开一些实施例中，第一冷媒浓度传感器53设置在室内，被配置为检测室内的冷媒浓度。第二冷媒浓度传感器54设置在室内机10中，被配置为检测室内机10中的冷媒浓度。
第一压力传感器55设置在室内膨胀阀12与第二膨胀阀102之间，被配置为检测室内膨胀阀12与第二膨胀阀102的之间的连接配管70处的压力值。第二压力传感器56设置在压缩机22的排气口F处，被配置为检测压缩机22的排气压力值。第三压力传感器57设置在压缩机22的吸气口E处，被配置为检测压缩机22的吸气压力值。
温度传感器58设置在压缩机22的排气口F处，被配置为检测压缩机22的排气温度值。
室内风机组件13产生通过室内换热器11的室内空气的气流，被配置为促进在室内换热器11的传热管中流动的冷媒与室内空气的热交换，以辅助温度调节。室外风机组件25产生通过室外换热器23的室外空气的气流，被配置为促进在室外换热器23的传热管中流动的冷媒与室外空气的热交换。
图5为根据一些实施例的空调系统的另一种框图，区别于图3中的空调系统100，如图5所示，空调系统100还包括第一截止阀51、第二截止阀52、第一冷媒浓度传感器53、第二冷媒浓度传感器54、第一压力传感器55、第二压力传感器56、第三压力传感器57和温度传感器58。室内机10还包括室内风机组件13，室外机20还包括室外风机组件25。
在本公开一些实施例中，空调系统100还包括存储器59。存储器59与控制器40耦接。
在一些实施例中，存储器59被配置为存储软件程序及数据。控制器40通过运行存储在存储器59的软件程序或数据，以执行空调系统100的各种功能以及数据处理。本公开一些实施例中的存储器59可以存储操作系统及各种应用程序，还可以存储执行本公开一些实施例提供的一种空调系统100的冷媒回收方法的代码。
如图5所示，在本公开一些实施例中，室内机10还可以包括遥控装置62(例如遥控器)，遥控装置62与控制器40耦接，遥控装置62具有例如使用红外线或其他通信方式与控制器40进行通信的功能。用户可以通过遥控装置62对空调系统100进行控制，实现用户与空调系统100之间的交互。
在一些实施例中，如图5所示，空调系统100还可以包括：通信器63，通信器63与控制器40电连接，用于与服务器建立通信连接。通信器63可以包括射频(radio frequency，RF)模块、蜂窝模块、无线保真(wireless fidelity，WIFI)模块、以及GPS模块等。
在一些实施例中，空调系统100也可以通过通信器63将自身的运行数据发送至服务器，以便于服务器根据空调系统100的数据计算空调系统100的各部件在工作过程中的运行参数，进而将计算出的运行参数发送至空调系统100。控制器40控制空调系统100中各部件按照服务器计算出的运行参数进行工作。
图6为根据一些实施例的空调系统在制冷模式下的一种循环原理图，如图6所示，当空调系统100运行在制冷模式时，第一膨胀阀101、室内膨胀阀12、第二膨胀阀102、室外膨胀阀24打开，四通阀21的第一接口A与第二接口B连通，第三接口C与第四接 口D连通。此时，室外换热器23作为冷凝器，室内换热器11作为蒸发器。
压缩机22排出的高温高压的气相冷媒通过四通阀21，流入室外换热器23。室外换热器23将高温高压的气相冷媒冷凝为中温高压状态的过冷液相冷媒，第二膨胀阀102和室内膨胀阀12将中温高压过冷液态冷媒在经过节流降压之后变成低温低压气液两相态冷媒，室内换热器11从周围环境中吸取热量并将低温低压的气液两相态冷媒蒸发形成低温低压的气相冷媒，低温低压的气相冷媒经过四通阀21后返回到压缩机22中，形成制冷循环。图6中的箭头指向代表空调系统100处于制冷模式下冷媒的流动方向。
在空调系统100运行过程中，室内机10、室外机20和连接配管70中均存在冷媒，而当连接配管70长度较长时，当在室内检测到冷媒泄漏，需要将连接配管70内和室内机10内的冷媒全部回收，由于连接配管70内的冷媒存量较大，存在无法将冷媒完全回收的情况。若连接配管70内的冷媒未及时回收，并且从连接配管70处泄漏到室内侧，容易导致室内冷媒浓度过高，存在易燃区域，造成隐患。
为解决上述问题，本公开一些实施例提供了一种空调系统的冷媒回收方法，该方法应用于控制器40。
图7为根据一些实施例的空调系统的一种冷媒回收方法的流程图，如图7所示，在本公开一些实施例中，该方法可以包括步骤S101至S107。
S101、在获取到冷媒在室内泄露的信息时，控制空调系统100运行在制冷模式。
S102、控制室内膨胀阀12和第二膨胀阀102关闭、第一膨胀阀101打开。
控制器40在获取到冷媒在室内泄露的信息时，控制空调系统100处于图10中所示的0点状态，此时，室内膨胀阀12和第二膨胀阀102关闭、压缩机22和第一膨胀阀101打开。
如图6所示，由于空调系统100运行在制冷模式，从压缩机22流出的高温高压的气相冷媒流入室外换热器23后，不能再向室内机10侧流动，由于室内膨胀阀12和第二膨胀阀102均处于关闭状态，因此此时室内膨胀阀12和第二膨胀阀102之间的冷媒也不再流动，且室内膨胀阀12与第一膨胀阀101之间的冷媒向室外机20侧流动。
在本公开一些实施例中，由于室内膨胀阀12、第二膨胀阀102和第一膨胀阀101均为电子膨胀阀，因此控制器40可以将室内膨胀阀12和第二膨胀阀102的开度调节为全关状态，即室内膨胀阀12和第二膨胀阀102的开度均为0pls。如此，室内膨胀阀12和第二膨胀阀102之间的冷媒管路为封闭管路，可以存储室内膨胀阀12和第二膨胀阀102之间的冷媒管路中的冷媒。
其中，pls为pulse的缩写，是指脉冲，为电子膨胀阀的开度单位。
在本公开一些实施例中，控制器40例如可以将第一膨胀阀101的开度调节为全开状态，如此，可以实现冷媒在冷媒气管31中流通面积最大，实现冷媒的最快回收，减少冷媒回收的时间。
在本公开一些实施例中，控制器40在控制室内膨胀阀12和第二膨胀阀102关闭时，还可以控制室内风机组件13开启，以尽可能将室内机10侧的液相冷媒蒸发为气相冷媒，这样可以避免液相冷媒进入压缩机，出现液击现象(即液相冷媒在室外机20蒸发不充分，导致未蒸发的液相冷媒流入到压缩机22中)，影响压缩机22的可靠性。如此，可以提高室内换热器11与室内空气的换热效率，从而提高室内换热器11与室内膨胀阀12之间的冷媒流速，减少冷媒回收的时间，从而降低冷媒的泄露量。
在本公开一些实施例中，控制器40可以控制室内风机组件13以第一预设档位运行，第一预设档位为空调系统100预先设置的档位。第一预设档位例如为室内风机组件13所能达到的最高档位，即室内风机组件13在单位时间内出风量最多的档位。如此，提高了室内换热器11与室内空气的换热效率，可以加快液相冷媒在室内换热器11中蒸发为气相冷媒的速度，可以实现冷媒的快速回收，降低冷媒的泄露量。
在本公开另一些实施例中，控制器40在控制室内膨胀阀12和第二膨胀阀102关闭时， 还可以控制室外风机组件25开启，以使回收至压缩机22与室外换热器23之间的冷媒气管31中的冷媒、流向室外换热器23与第二膨胀阀102之间的冷媒液管32。
在本公开一些实施例中，控制器40可以控制室外风机组件25以第二预设档位运行，第二预设档位为空调系统100预先设置的档位。第二预设档位例如为室外风机组件25所能达到的最高档位，即室外风机组件25在单位时间内出风量最多的档位。如此，提高了室外换热器23与室外空气的换热效率，可以加快气相冷媒在室外换热器23中冷凝为液相冷媒的速度，可以避免压缩机22与室外换热器23之间的冷媒管路在冷媒回收时压力变化过大，确保空调系统100正常运转。
S103、确定压缩机22满足第一预设条件时，控制压缩机22停机、且关闭第一膨胀阀101。
在本公开一些实施例中，当压缩机22满足第一预设条件时，控制器40判定此时室内机10中的冷媒通过冷媒气管31流入室外机20，即可以结束冷媒回收，此时，控制器40控制空调系统100处于图10中M点状态，此时，室内膨胀阀12和第二膨胀阀102仍然处于关闭状态，控制器40控制压缩机22停机，并关闭第一膨胀阀101，以断开室内机10与室外机20的连通，从而避免室外机20侧的冷媒通过冷媒气管31回流至室内机10侧。
控制器40可以将该第一膨胀阀101调整为全关状态，即，将第一膨胀阀101的开度调整为0Pls。
第一预设条件可以包括以下至少之一：
其一，压缩机22切换至制冷模式之后的运行时间大于预设时间。
预设时间为室内机10中的冷媒流入室外机20，且室内机10中的冷媒含量已低于第一预设阈值时，压缩机22切换至制冷模式的运行时间。在本公开一些实施例中，预设时间为预先设置的时间，预设时间例如为20min、25min等。
需要说明的是，当室内机10中的冷媒含量低于第一预设阈值时，表明室内机10中的冷媒已回收完毕。因此，控制器40若确定压缩机22切换至制冷模式之后的运行时间大于预设时间，则可以判定此时室内机10中的冷媒通过冷媒气管31流入室外机20，结束冷媒回收。
例如，若预设时间为20min，则当压缩机22切换至制冷模式运行20min后，控制器40控制压缩机22停止运转、且关闭第一膨胀阀101。
可以理解的是，若确定空调系统100在冷媒泄露前未运行在制冷模式，则控制器40将空调系统100的运行模式切换至制冷模式，若确定空调系统100在冷媒泄露前运行在制冷模式，则控制器40不需要再切换空调系统100的运行模式。
其二，压缩机22的排气压力值大于第一预设值。
第一预设值为室内机10中的冷媒流入室外机20，且室内机10中的冷媒含量已低于第一预设阈值时，压缩机22的排气压力值。在本公开一些实施例中，第一预设值为预先设置的数值，第一预设值例如为3.7Mpa、3.8Mpa等。
控制器40若确定压缩机22的排气压力值大于第一预设值，则可以判定此时室内机10中的冷媒通过冷媒气管31流入室外机20，结束冷媒回收。
例如，若压缩机22的(当前)排气压力值为3.8Mpa，第一预设值为3.7Mpa，则控制器40控制压缩机22停止运转、且关闭第一膨胀阀101。
其三，压缩机22的排气温度值大于第二预设值。
第二预设值为室内机10中的冷媒流入室外机20，且室内机10中的冷媒含量已低于第一预设阈值时，压缩机22的排气温度值。在本公开一些实施例中，第二预设值为预先设置的数值，该第二预设值例如为105℃、100℃等。
控制器40若确定压缩机22的排气温度值大于第二预设值，则可以判定此时室内机10中的冷媒通过冷媒气管31流入室外机20，结束冷媒回收。例如，若第二预设值为105℃，压缩机22的(当前)排气温度为108℃，则控制器40控制压缩机22停止运转、且关闭第 一膨胀阀101。
其四，压缩机22的吸气压力值小于第三预设值。
第三预设值为室内机10中的冷媒流入室外机20，且室内机10中的冷媒含量已低于第一预设阈值时，压缩机22的吸气压力值。在本公开一些实施例中，第三预设值为预先设置的数值，第三预设值例如为0.1Mpa、0.08Mpa等。
控制器40若确定压缩机22的吸气压力值小于第三预设值，则可以判定此时室内机10中的冷媒通过冷媒气管31流入室外机20，结束冷媒回收。
例如，第三预设值可以为0.1Mpa，压缩机22的(当前)吸气压力值为0.08Mpa，则控制器40控制压缩机22停止运转、且关闭第一膨胀阀101。
可以理解的是，在第一预设条件满足以上四个判断条件中的至少之一的情况下即可结束冷媒回收，本公开对四个判断条件的执行顺序不做限定，对应的判断条件是否可以执行取决于空调系统100的运行状态。
需要说明的是，预设时间、第一预设值、第二预设值、第三预设值也可以通过实验获取。
在本公开一些实施例中，控制器40在控制压缩机22停机之后，还控制室外风机组件25关闭。如此，可以节省空调系统100的能耗。
在本公开另一些实施例中，控制器40在控制压缩机22停机之后，还控制室内风机组件13关闭。如此，可以节省空调系统100的能耗。
S104、判断冷媒在室内是否继续泄露，若是，则执行S105，若否，则执行S107。
在本公开一些实施例中，S104还可以包括：控制器40通过第一冷媒浓度传感器53获取室内的冷媒浓度，判断当前时刻室内的冷媒浓度是否大于前一时刻室内的冷媒浓度。
可以理解的是，在本公开一些实施例中，室内的冷媒浓度的变化可以表征冷媒是否继续在室内泄露。例如，若当前时刻室内的冷媒浓度大于前一时刻室内的冷媒浓度，则表明冷媒在室内继续泄露；若当前时刻室内的冷媒浓度小于或等于前一时刻室内的冷媒浓度，则表明冷媒不再在室内泄露。
在本公开另一些实施例中，S104包括：控制器40通过第一压力传感器55获取室内膨胀阀12与第二膨胀阀102之间的连接配管70处的当前时刻和前一时刻的压力值，并判断连接配管70处当前时刻的压力值是否小于前一时刻的压力值。
可以理解的是，室内膨胀阀12与第一膨胀阀101之间的冷媒管路中的冷媒含量已低于第一预设阈值，若冷媒继续在室内泄露，则该泄露点位于连接配管70处。连接配管70处的压力值的变化可以表征连接配管70处冷媒浓度的变化，控制器40通过判断连接配管70处冷媒浓度是否发生变化来判断冷媒是否继续在室内泄露。
例如，若连接配管70处冷媒浓度增大，则表明冷媒在连接配管70处继续泄露；若连接配管70处冷媒浓度减小，则表明冷媒在连接配管70处已停止泄露。
S105、启动压缩机22，并且开启第一膨胀阀101和室内膨胀阀12。
可以理解的是，在判断冷媒在室内是否继续泄露时，压缩机22、第一膨胀阀101和室内膨胀阀12处于关闭状态，且经过S101至S102之后，室内膨胀阀12和第一膨胀阀101之间的冷媒已回收完成，此处不会再出现冷媒泄露的情况。
因此，当控制器40确定冷媒在室内继续泄漏，则可以确定冷媒泄露点位于室内膨胀阀12与第二膨胀阀102之间的连接配管70处，控制器40控制空调系统100处于图11中所示的N2点状态，此时，第二膨胀阀102处于关闭状态，控制器40启动压缩机22，并开启第一膨胀阀101和室内膨胀阀12，将连接配管70处的冷媒通过室内膨胀阀12和第一膨胀阀101回收至室外机20侧。在本公开一些实施例中，控制器40可以将第一膨胀阀101的开度调节为全开状态，从而使冷媒管路具有较好的流通能力。
控制器40在启动压缩机22后可以逐步提高压缩机22的频率，直至压缩机22的运转频率达到预设运转频率后，压缩机22继续以该预设运转频率运行。这样，可以使压缩机 22的运转稳定，能够延长压缩机22的使用寿命。
在空调系统100运行在制冷模式时，控制器40通过室内膨胀阀12的开度的大小来控制室内机10的过热度，室内机10始终保证预设的过热度能够防止压缩机22发生回液问题。
需要说明的是，过热度是指在冷媒在蒸发器出口的实际温度与此处冷媒压力下对应的饱和温度的差值，也即蒸发器出口温度与蒸发温度的差值。
在空调系统100运行在制冷模式时，室内膨胀阀12的开度小于最大开度，例如，若室内膨胀阀12的最大开度为200Pls，制冷模式下室内膨胀阀12的开度为膨胀阀最大开度的10％，即室内膨胀阀12的开度为20Pls，此时，相较于全开状态而言，减少了冷媒管路的流通面积，减少了由连接配管70流入室内机10的冷媒量。为避免压缩机22发生液击，室内膨胀阀12的开度不应大于第一预设开度，而为了保证连接配管70处的内冷媒较快完成回收，室内膨胀阀12的开度不应小于第二预设开度。其中，第一预设开度是指会导致液相冷媒未充分蒸发而进入压缩机22的室内膨胀阀12的开度；第二预设开度是指会影响连接配管70处的冷媒回收速率的室内膨胀阀12的开度；且第一预设开度小于第二预设开度。
因此，在本公开一些实施例中，在控制器40还可以根据压缩机22的吸气压力值，调整室内膨胀阀12的开度至预设目标开度。
可以理解的是，当压缩机22的吸气压力值高于预设吸气压力值时，室内机10中的冷媒量较多，室内膨胀阀12的开度维持不变；当吸气压力降低时，室内机10中的冷媒留存量较小，控制器40增加室内膨胀阀12的开度。存储器59中存储有压缩机22的吸气压力值与室内膨胀阀12的预设目标开度的对应关系，在本公开一些实施例中，压缩机22的吸气压力值的大小可以与室内膨胀阀12的预设目标开度呈负相关关系。
例如，压缩机22的吸气压力值与室内膨胀阀12的预设目标开度的对应关系可以如表1所示。
表1
控制器40通过第三压力传感器57获取压缩机22的吸气压力值，根据该吸气压力值从存储器59中获取对应的室内膨胀阀12的预设目标开度，并控制室内膨胀阀12调整至预设目标开度。
例如，若控制器40通过第三压力传感器57获取到压缩机22的吸气压力值为0.5Mpa，根据表1可知，控制器40将第一膨胀阀101的开度调节为800pls，增大管路流通面积，将连接配管70内的冷媒留存量补充到室内机10内，再由压缩机22吸入室外机20；经过一段时间后，控制器40通过第三压力传感器57获取到压缩机22的吸气压力值变为0.49Mpa，根据表1，将第一膨胀阀101的开度调整为1100Pls。如此，随着吸气压力的降低，室内膨胀阀12的开度逐渐增大，使连接配管70内的冷媒被回收到室外机20，且连接配管70内冷媒量低于第二预设阈值，以保证压缩机22的使用可靠性。
需要说明的是，当连接配管70内的冷媒量低于第二预设阈值时，表明连接配管70处的冷媒已回收完毕。
在本公开一些实施例中，控制器40逐步提高室内膨胀阀12的开度，直至室内膨胀阀12的开度到达预设目标开度。
例如，若室内膨胀阀12的预设目标开度为200Pls，则控制器40可以以20Pls/s的速度 增加室内膨胀阀12的开度，调节时间为10s。
在本公开一些实施例中，在开启第一膨胀阀101和室内膨胀阀12时，控制器40还可以控制室内风机组件13开启，避免液相冷媒进入压缩机22，出现液击问题，影响压缩机22的可靠性。
在本公开一些实施例中，控制器40可以控制室内风机组件13以第一预设档位运行。
在本公开一些实施例中，在开启第一膨胀阀101和室内膨胀阀12时，控制器40还可以控制室外风机组件25开启，以使回收至压缩机22与室外换热器23之间的冷媒气管31中的冷媒、流向室外换热器23与第二膨胀阀102之间的冷媒液管32。
在本公开一些实施例中，控制器40可以控制室外风机组件25以第二预设档位运行。
S106、确定压缩机22再次满足第一预设条件时，控制压缩机22停机、且关闭第一膨胀阀101。
可以理解的是，在室内膨胀阀12和第一膨胀阀101开启后，冷媒气管31中会通过重新流入冷媒，导致压缩机22不再满足第一预设条件。
因此，控制器40启动压缩机22并开启第一膨胀阀101和室内膨胀阀12，以将室内机10侧的冷媒气管31中的冷媒回收至室外机20，在压缩机22满足第一预设条件时，则表示室内机10侧的冷媒气管31中的冷媒完全回收，此时，控制器40控制压缩机22停机；并关闭第一膨胀阀101，以避免室外机20侧的冷媒回流至室内机10侧。
在本公开一些实施例中，控制器40控制压缩机22停机之后，还控制室外风机组件25和室内风机组件13关闭。
S107、冷媒回收完成。
控制器40控制空调系统100处于图10中N1点状态或图11中P点状态，此时，压缩机22、第一膨胀阀101、室内膨胀阀12和第二膨胀阀102均处于关闭状态。
采用本公开一些实施例的方案，可以判断出冷媒泄露处为连接配管70处或者是室内机10处，并及时将连接配管70和室内机10内的冷媒回收，降低冷媒的泄露量。
在本公开一些实施例中，在控制器40获取到冷媒在室内泄露时，空调系统100的运行模式可能为制热模式等。图8为根据一些实施例的空调系统的另一种冷媒回收方法的流程图，如图8所示，S101还可以包括S1011至S1013。
S1011、判断空调系统100当前运行模式是否为制冷模式，若是，则执行S1013，若否，则执行S1012。
在本公开一些实施例中，控制器40可以获取空调系统100的运行参数信息，例如获取空调系统100当前的运行模式，从而判断当前空调系统100是否运行在制冷模式。
在本公开另一些实施例中，控制器40还可以根据获取四通阀21的四个接口的连接状况以及压缩机22的运行频率确定当前运行模式，从而判断当前空调系统100是否运行在制冷模式。例如，当控制器40获取到四通阀21的第一接口A与第二接口B连通，第三接口C与第四接口D连通时，可以确定空调系统100运行在制冷模式；当控制器40获取四通阀21的第一接口A与第四接口D连通，第二接口B与第三接口C连通时，可以确定空调系统100运行在制热模式。
S1012、当前运行模式停止运行。
控制器40控制空调系统100停止运行当前运行模式。
S1013、控制空调系统100以制冷模式运行。
当控制器40确定空调系统100运行在制冷模式时，则不需要改变空调系统100当前的运行模式；当控制器40确定空调系统100运行在非制冷模式时，则控制空调系统100将运行模式调整为制冷模式。
图9为根据一些实施例的空调系统的又一种冷媒回收方法的流程图，如图9所示，在步骤S101之前，空调系统100的冷媒回收方法还可以包括S100。
S100、获取室内在当前时刻和前一时刻的室内冷媒浓度，若确定当前时刻的冷媒浓 度大于前一时刻的冷媒浓度，则确认冷媒在室内泄露。
控制器40通过第一冷媒浓度传感器53获取室内的冷媒浓度，判断当前时刻室内的冷媒浓度是否大于前一时刻室内的冷媒浓度。
例如，若确定当前时刻室内的冷媒浓度大于前一时刻室内的冷媒浓度，则表明冷媒在室内泄露；若确定当前时刻室内的冷媒浓度小于或等于前一时刻室内的冷媒浓度，则表明冷媒未在室内泄露。
在本公开一些实施例中，控制器40每间隔预设时长根据冷媒浓度传感器54获取室内的冷媒浓度，当前时刻与前一时刻即间隔预设时长。其中，间隔预设时长可以为5s、10s、30s等，本公开对此不作限定。
例如，间隔预设时长为30s，则控制器40每间隔30s获取室内的冷媒浓度。可以理解的是，若当前时刻的冷媒浓度小于或等于前一时刻的冷媒浓度，则控制器40不执行动作，可以继续获取室内在当前时刻和前一时刻的冷媒浓度。
这样，控制器40可以及时获取到冷媒在室内泄露的信息，并及时回收冷媒，减少冷媒在室内的泄露。
图10为根据一些实施例的一种空调系统中各部件的开闭状态图，如图10所示，控制器40获取到冷媒泄露的信息时，控制器40控制压缩机22、第一膨胀阀101、室内膨胀阀12和第二膨胀阀102处于0点状态，此时，压缩机22处于开启状态，第一膨胀阀101处于开启状态，室内膨胀阀12处于关闭状态，第二膨胀阀102处于关闭状态，使室内机10泄漏的冷媒开始回收至室外机20。压缩机22满足第一预设条件时，控制器40控制压缩机22、第一膨胀阀101、室内膨胀阀12和第二膨胀阀102处于M点状态，此时，室内机10侧的冷媒回收完成，因此，压缩机22处于关闭状态，第一膨胀阀101处于关闭状态，室内膨胀阀12处于关闭状态，第二膨胀阀102处于关闭状态。控制器40确定冷媒在室内不再泄露时，表明冷媒泄露处位于室内机10处，且室内机10泄露的冷媒已回收完成，控制器40控制压缩机22、第一膨胀阀101、室内膨胀阀12和第二膨胀阀102处于N1点状态，此时，压缩机22处于关闭状态，第一膨胀阀101处于关闭状态，室内膨胀阀12处于关闭状态，第二膨胀阀102处于关闭状态。
图11为根据一些实施例的另一种空调系统中各部件的开闭状态图，图11中的0点和M点与图10中的0点和M点的含义相同，在此不再赘述。区别于图10中的开闭状态图，图11中控制器40确定冷媒在室内继续泄露，表明冷媒泄露处位于连接配管70处，控制器40控制压缩机22、第一膨胀阀101、室内膨胀阀12和第二膨胀阀102处于N2点状态，此时，压缩机22处于开启状态，第一膨胀阀101处于开启状态，室内膨胀阀12处于开启状态，第二膨胀阀102处于关闭状态，重新回收连接配管70处的冷媒。压缩机22再一次满足第一预设条件时，控制器40控制压缩机22、第一膨胀阀101、室内膨胀阀12和第二膨胀阀102处于P点状态，此时，连接配管70处的冷媒回收完成，压缩机22、第一膨胀阀101、室内膨胀阀12和第二膨胀阀102均处于关闭状态。在本公开一些实施例中，室内膨胀阀12在P点时也可以处于开启状态。
本领域的技术人员将会理解，本申请的公开范围不限于上述具体实施例，并且可以在不脱离本申请的精神的情况下对实施例的某些要素进行修改和替换。本申请的范围受所附权利要求的限制。

Claims (19)

  1. 一种空调系统，包括：
    室内机，包括室内换热器和室内膨胀阀；
    室外机，包括压缩机；所述室内机与所述室外机之间分别通过冷媒气管和冷媒液管连接；
    第一膨胀阀，设置于所述室内换热器和所述室外机之间的所述冷媒气管上，被配置为控制所述室内换热器和所述室外机之间的所述冷媒气管的连通或断开；
    第二膨胀阀，设置于所述室外机和所述室内膨胀阀之间的所述冷媒液管上，被配置为控制所述室外机和所述室内膨胀阀之间的所述冷媒液管的连通或断开；
    控制器，被配置为：
    在获取到冷媒在室内泄露的信息时，控制所述空调系统运行在制冷模式，且控制所述室内膨胀阀和所述第二膨胀阀关闭、所述第一膨胀阀打开；
    若确定所述压缩机满足第一预设条件，则控制所述压缩机停机、且关闭所述第一膨胀阀；
    在控制所述压缩机停机之后，若确定所述冷媒在室内继续泄露，则启动所述压缩机，并且开启所述第一膨胀阀和所述室内膨胀阀；
    若确定所述压缩机再次满足所述第一预设条件，则控制所述压缩机停机、且关闭所述第一膨胀阀。
  2. 根据权利要求1所述的空调系统，还包括：
    冷媒浓度传感器，被配置为检测室内的冷媒浓度；
    所述在获取到冷媒在室内泄露的信息之前，所述控制器还被配置为：
    获取室内在当前时刻和前一时刻的冷媒浓度，若确定当前时刻的冷媒浓度大于前一时刻的冷媒浓度，则确认冷媒在室内泄露。
  3. 根据权利要求1或2所述的空调系统，还包括第一压力传感器，所述第一压力传感器设置在所述室内膨胀阀与所述第二膨胀阀之间，被配置为检测所述室内膨胀阀和所述第二膨胀阀之间的连接配管处的压力值；
    获取所述室内膨胀阀和所述第二膨胀阀之间的所述连接配管处当前时刻和前一时刻的压力值；
    所述若确定所述冷媒在室内继续泄露，包括以下之一：
    若确定所述室内膨胀阀和所述第二膨胀阀之间的所述连接配管处当前时刻的压力值小于所述前一时刻的压力值，则启动所述压缩机，并且开启所述第一膨胀阀和所述室内膨胀阀；和
    若确定当前时刻的冷媒浓度大于前一时刻的冷媒浓度，则启动所述压缩机，并且开启所述第一膨胀阀和所述室内膨胀阀。
  4. 根据权利要求1至4中任一项所述的空调系统，其中，所述第一预设条件包括：所述压缩机切换至制冷模式之后的运行时间大于预设时间。
  5. 根据权利要求4所述的空调系统，还包括：
    第二压力传感器，被配置为检测所述压缩机的排气压力值；
    温度传感器，被配置为检测所述压缩机的排气温度值；
    所述第一预设条件还包括以下之一：
    所述压缩机的排气压力值大于第一预设值；和
    所述压缩机的排气温度值大于第二预设值。
  6. 根据权利要求4或5所述的空调系统，还包括：第三压力传感器，所述第三压力传感器被配置为检测所述压缩机的吸气压力值；
    所述第一预设条件还包括：所述压缩机的吸气压力值小于第三预设值。
  7. 根据权利要求1至6中任一项所述的空调系统，其中，所述室内膨胀阀为室内电子膨胀阀；
    所述空调系统还包括：第三压力传感器，所述第三压力传感器被配置为检测所述压缩机的吸气压力值；
    所述启动所述压缩机，并且开启所述第一膨胀阀和所述室内膨胀阀，还包括：
    根据所述压缩机的吸气压力值，调整所述室内膨胀阀至预设目标开度。
  8. 根据权利要求7所述的空调系统，还包括存储器，所述存储器中存储有所述吸气压力值与所述室内膨胀阀的预设目标开度的对应关系；
    所述根据所述压缩机的吸气压力值，调整所述室内膨胀阀至预设目标开度，包括：
    通过所述第三压力传感器获取所述压缩机的当前吸气压力值；
    根据所述当前吸气压力值从所述存储器中获取与对应的所述室内膨胀阀的预设目标开度；
    控制所述室内膨胀阀调整至所述预设目标开度。
  9. 根据权利要求1至8中任一项所述的空调系统，还包括：
    室外风机组件，设置在所述室外机中，被配置为向室外换热器吹风；
    室内风机组件，设置在所述室内机中，被配置为向所述室内换热器吹风；
    在所述控制所述室内膨胀阀和所述第二膨胀阀关闭时，所述控制器还被配置为：
    控制所述室外风机组件和所述室内风机组件开启；
    其中，所述控制所述室内风机组件开启，包括：控制所述室内风机组件以第一预设档位运行；
    所述控制所述室外风机组件开启，包括：控制所述室外风机组件以第二预设档位运行。
  10. 根据权利要求1至9中任一项所述的空调系统，还包括：
    室外风机组件，设置在所述室外机中，被配置为向室外换热器吹风；
    室内风机组件，设置在所述室内机中，被配置为向所述室内换热器吹风；
    在所述控制所述压缩机停机之后，所述控制器还被配置为：
    控制所述室外风机组件和所述室内风机组件关闭；
    其中，所述控制所述室内风机组件开启，包括：控制所述室内风机组件以第一预设档位运行；
    所述控制所述室外风机组件开启，包括：控制所述室外风机组件以第二预设档位运行。
  11. 根据权利要求1至10中任一项所述的空调系统，还包括：
    室外风机组件，设置在所述室外机中，被配置为向室外换热器吹风；
    室内风机组件，设置在所述室内机中，被配置为向所述室内换热器吹风；
    在所述开启所述第一膨胀阀和所述室内膨胀阀时，所述控制器还被配置为：
    控制所述室外风机组件和所述室内风机组件开启；
    其中，所述控制所述室内风机组件开启，包括：控制所述室内风机组件以第一预设 档位运行；
    所述控制所述室外风机组件开启，包括：控制所述室外风机组件以第二预设档位运行。
  12. 一种空调系统的控制方法，其中，所述空调系统包括：
    室内机，包括：室内换热器和室内膨胀阀；
    室外机，包括压缩机；所述室内机与所述室外机之间分别通过冷媒气管和冷媒液管连接；
    第一膨胀阀，设置于所述室内换热器和所述室外机之间的所述冷媒气管上，被配置为控制所述室内换热器和所述室外机之间的所述冷媒气管的连通或断开；
    第二膨胀阀，设置于所述室外机和所述室内膨胀阀之间的所述冷媒液管上，被配置为控制所述室外机和所述室内膨胀阀之间的所述冷媒液管的连通或断开；
    冷媒浓度传感器，被配置为检测室内的冷媒浓度；
    控制器，与所述室内换热器、所述室外换热器、所述压缩机、所述第一膨胀阀、所述第二膨胀阀和所述冷媒浓度传感器耦接；
    所述控制方法包括：
    获取室内在当前时刻和前一时刻的冷媒浓度，若确定当前时刻的冷媒浓度大于前一时刻的冷媒浓度，则确认冷媒在室内泄露；
    在获取到冷媒在室内泄露的信息时，控制所述空调系统运行在制冷模式，且控制所述室内膨胀阀和所述第二膨胀阀均关闭、所述第一膨胀阀打开；
    若确定所述压缩机满足第一预设条件，则控制所述压缩机停机、且关闭所述第一膨胀阀；
    在控制所述压缩机停机之后，若确定所述冷媒在室内继续泄露，则启动所述压缩机，并且开启所述第一膨胀阀和所述室内膨胀阀；
    若确定所述压缩机再次满足所述第一预设条件，则控制所述压缩机停机、且关闭所述第一膨胀阀。
  13. 根据权利要求12所述的控制方法，其中，所述空调系统还包括第一压力传感器，所述第一压力传感器设置在所述室内膨胀阀与所述第二膨胀阀之间，被配置为检测所述室内膨胀阀和所述第二膨胀阀之间的所述连接配管处的压力值；
    获取所述室内膨胀阀和所述第二膨胀阀之间的所述连接配管处当前时刻和前一时刻的压力值；
    所述若确定所述冷媒在室内是否继续泄露，包括以下之一：
    若确定所述室内膨胀阀和所述第二膨胀阀之间的所述连接配管处当前时刻的压力值小于所述前一时刻的压力值，则启动所述压缩机，并且开启所述第一膨胀阀和所述室内膨胀阀；和
    若确定当前时刻的冷媒浓度大于前一时刻的冷媒浓度，则启动所述压缩机，并且开启所述第一膨胀阀和所述室内膨胀阀。
  14. 根据权利要求12或13所述的控制方法，其中，所述第一预设条件包括：所述压缩机切换至制冷模式之后的运行时间大于预设时间。
  15. 根据权利要求14所述的控制方法，其中，所述空调系统还包括：
    第二压力传感器，被配置为检测所述压缩机的排气压力值；
    温度传感器，被配置为检测所述压缩机的排气温度值；
    所述第一预设条件还包括以下之一：
    所述压缩机的排气压力值大于第一预设值；和，
    所述压缩机的排气温度值大于第二预设值。
  16. 根据权利要求14或15所述的控制方法，其中，所述空调系统还包括：第三压力传感器，所述第三压力传感器被配置为检测所述压缩机的吸气压力值；
    所述第一预设条件还包括：所述压缩机的吸气压力值小于第三预设值。
  17. 根据权利要求12至16中任一项所述的控制方法，其中，所述室内膨胀阀为室内电子膨胀阀；
    所述空调系统还包括：第三压力传感器，所述第三压力传感器被配置为检测所述压缩机的吸气压力值；
    所述启动所述压缩机，并且开启所述第一膨胀阀和所述室内膨胀阀，还包括：
    根据所述压缩机的吸气压力值，调整所述室内膨胀阀至预设目标开度。
  18. 根据权利要求17所述的控制方法，其中，所述空调系统还包括存储器，所述存储器中存储有所述吸气压力值与所述室内膨胀阀的预设目标开度的对应关系；
    所述根据所述压缩机的吸气压力值，调整所述室内膨胀阀至预设目标开度，包括：
    通过所述第三压力传感器获取所述压缩机的当前吸气压力值；
    根据所述当前吸气压力值从所述存储器中获取与对应的所述室内膨胀阀的预设目标开度；
    控制所述室内膨胀阀调整至所述预设目标开度。
  19. 根据权利要求12至18中任一项所述的控制方法，其中，所述空调系统还包括：
    室外风机组件，设置在所述室外机中，被配置为向室外换热器吹风；
    室内风机组件，设置在所述室内机中，被配置为向所述室内换热器吹风；
    所述控制方法还包括以下至少之一：
    在控制所述室内膨胀阀和所述第二膨胀阀均关闭时，控制所述室外风机组件和所述室内风机组件开启；
    在控制所述压缩机停机之后，控制所述室外风机组件和所述室内风机组件关闭；或
    在开启所述第一膨胀阀和所述室内膨胀阀时，控制所述室外风机组件和所述室内风机组件开启；
    其中，所述控制所述室内风机组件开启，包括：控制所述室内风机组件以第一预设档位运行；
    控制所述室外风机组件开启，包括：控制所述室外风机组件以第二预设档位运行。
PCT/CN2023/105122 2022-11-14 2023-06-30 空调系统及其控制方法 Ceased WO2024103793A1 (zh)

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