EP3517848B1 - Multi-split air conditioning system and switching control method for operating mode of indoor units thereof - Google Patents

Multi-split air conditioning system and switching control method for operating mode of indoor units thereof Download PDF

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Publication number
EP3517848B1
EP3517848B1 EP16916102.3A EP16916102A EP3517848B1 EP 3517848 B1 EP3517848 B1 EP 3517848B1 EP 16916102 A EP16916102 A EP 16916102A EP 3517848 B1 EP3517848 B1 EP 3517848B1
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EP
European Patent Office
Prior art keywords
control valve
indoor unit
control
mode
refrigeration
Prior art date
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Application number
EP16916102.3A
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German (de)
English (en)
French (fr)
Other versions
EP3517848A1 (en
EP3517848A4 (en
Inventor
Jun Zhou
Shihong YANG
Zibao ZHUANG
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.)
Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
Original Assignee
Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Publication of EP3517848A1 publication Critical patent/EP3517848A1/en
Publication of EP3517848A4 publication Critical patent/EP3517848A4/en
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Classifications

    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—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
    • 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
    • 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
    • F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
    • 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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • 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
    • 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
    • F24F11/62—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
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F24F11/67—Switching between heating and cooling modes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F25B2313/006—Compression machines, plants or systems with reversible cycle not otherwise provided for two pipes connecting the outdoor side to the indoor side with multiple indoor units
    • 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
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • 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
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0234—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in series 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
    • F25B2500/00—Problems to be solved
    • F25B2500/12—Sound
    • 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
    • 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
    • F25B2600/2507—Flow-diverting 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2515—Flow 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves

Definitions

  • the present disclosure relates to air conditioning technology field, and more particularly, to a method for controlling switching between operating modes of an indoor unit in a multi-split air conditioning system and a multi-split air conditioning system.
  • a multi-split air conditioning system is a high-efficiency air conditioning unit that reasonably distributes the refrigerant in the high-pressure pipe and the low-pressure pipe of the outdoor unit to the corresponding indoor unit operating in the heating mode or indoor unit operating in the refrigeration mode through a plurality of control valves in the shunt device, to realize simultaneous heating and refrigerating.
  • the indoor unit when the indoor unit performs the mode switching, and large mode switching (that is, the four-way valve in the outdoor unit does not need to be switched) is not involved, when the indoor unit receives a switching instruction for switching from a heating (refrigeration) mode to a refrigeration (heating) mode, the heating control valve (refrigeration control valve) corresponding to the indoor unit in the shunt device will be closed after delay of a tl time, and the refrigeration control valve (heating control valve) will be opened after delay of a (t1+t2) time, thus completing the mode switching of the indoor unit.
  • the heating control valve reffrigeration control valve
  • the indoor unit performs the mode switching, and large mode switching (that is, the outdoor four-way valve in the outdoor unit needs to be switched) is involved, the four-way valve in the outdoor unit and the refrigeration control valve (heating control valve) in the shunt device are switched independently, that is, switching is performed twice, which will cause large impact on the corresponding pipe system twice, and generate refrigerant impact noise twice, such that the reliability of the pipe system and the noise quality of the product can be seriously affected.
  • large mode switching that is, the outdoor four-way valve in the outdoor unit needs to be switched
  • the four-way valve in the outdoor unit and the refrigeration control valve (heating control valve) in the shunt device are switched independently, that is, switching is performed twice, which will cause large impact on the corresponding pipe system twice, and generate refrigerant impact noise twice, such that the reliability of the pipe system and the noise quality of the product can be seriously affected.
  • US 5 237 833 A relates to an air-conditioning system in which a plurality of indoor units are connected to a single heat source unit and particularly to a refrigerant flow rate control unit so that a multi-room heat pump type air conditioning system is provided for selectively operating the respective indoor units in cooling or heating mode of operation, or wherein cooling can be carried out in one or some indoor units while heating can be concurrently carried out in other indoor units.
  • the present invention aims to solve at least one of the technical problems in the related art to at least some extent.
  • an objective of the present invention is to provide a method for controlling switching between operating modes of an indoor unit in a multi-split air conditioning system as defined by claim 1.
  • Another objective of the present invention is to provide a multi-split air conditioning system as defined by claim 7.
  • inventions of an aspect of the present invention provide a method for controlling switching between operating modes of an indoor unit in a multi-split air conditioning system.
  • the multi-split air conditioning system includes an outdoor unit, a shunt device and a plurality of indoor units.
  • the outdoor unit includes a compressor and a four-way valve.
  • the shunt device includes: a first heat exchange component, a second heat exchange component, a first throttling component arranged between an outlet of a first heat exchange flow path of the first heat exchange component and an inlet of a first heat exchange flow path of the second heat exchange component, a second throttling component arranged between an outlet of a first heat exchange flow path of the second heat exchange component and an inlet of a second heat exchange flow path of the second heat exchange component, a bypass valve arranged between the outlet of the first heat exchange flow path of the second heat exchange component and a low pressure pipeline of the shunt device, and a heating control valve and a refrigeration control valve corresponding to each indoor unit in the plurality of indoor units.
  • the first throttling component includes a first control valve.
  • the method includes: when any indoor unit in the plurality of indoor units receives a mode switching instruction, sending, by the indoor unit, the mode switching instruction to the shunt device; performing, by the shunt device, switching control on the heating control valve or the refrigeration control valve corresponding to the indoor unit according to the received mode switching instruction, releasing a pressure by controlling the second throttling component, the first control valve and the bypass valve to reduce a differential pressure across the refrigeration control valve or the heating control valve corresponding to the indoor unit, obtaining a switching flag bit of the four-way valve, and controlling the refrigeration control valve or the heating control valve corresponding to the indoor unit and the four-way valve according to the switching flag bit of the four-way valve.
  • the indoor unit when any indoor unit in the plurality of indoor units receives the mode switching instruction, the indoor unit sends the mode switching instruction to the shunt device, the shunt device performs switching control on the heating control valve or the refrigeration control valve corresponding to the indoor unit according to the received mode switching instruction, releases the pressure by controlling the second throttling component, the first control valve and the bypass valve to reduce the differential pressure across the refrigeration control valve or the heating control valve corresponding to the indoor unit, obtains the switching flag bit of the four-way valve, and controls the refrigeration control valve or the heating control valve corresponding to the indoor unit and the four-way valve according to the switching flag bit of the four-way valve, such that hidden dangers of pipe cracking caused by the impact of refrigerant can be eliminated, the corresponding impact noise can be reduced, and the reliability and the noise quality of the system can be effectively improved.
  • the switching flag bit of the four-way valve includes 0 and 1.
  • the switching flag bit of the four-way valve is 0, the operating mode of the multi-split air conditioning system is switched from a main refrigeration mode to a pure refrigeration mode, or switched from the main refrigeration mode to the main refrigeration mode, or switched from a main heating mode to a pure heating mode, or switched from the main heating mode to the main heating mode.
  • the switching flag bit of the four-way valve is 1, the operating mode of the multi-split air conditioning system is switched from the main heating mode to the main refrigeration mode, or switched from the main refrigeration mode to the main heating mode, or switched from the main refrigeration mode to the pure heating mode, or switched from the main heating mode to the pure refrigeration mode.
  • the method when the shunt device determines that the indoor unit is switched from a heating mode to a refrigeration mode according to the received mode switching instruction, and the switching flag bit of the four-way valve is 0, the method includes: after delay of a first preset time, controlling, by the shunt device, the heating control valve corresponding to the indoor unit to close, and controlling the second throttling component and the first control valve to be in an open state, and after delay of a second preset time, controlling, by the shunt device, the second throttling component and the first control valve to be in a closed state, and controlling the refrigeration control valve corresponding to the indoor unit to be in an open state; or after delay of the first preset time, controlling, by the shunt device, the heating control valve corresponding to the indoor unit to close, and controlling the second throttling component and the bypass valve to be in an open state, and after delay of second preset time, controlling, by the shunt device, the second throttling component and the bypass valve to be in an open state, and after delay
  • the method when the shunt device determines that the indoor unit is switched from a heating mode to a refrigeration mode according to the received mode switching instruction, and the switching flag bit of the four-way valve is 1, the method includes: after delay of a first preset time, controlling, by the shunt device, the heating control valve corresponding to the indoor unit to close, and controlling the second throttling component and the first control valve to be in an open state, and after delay of a second preset time, controlling, by the shunt device, the second throttling component and the first control valve to be in a closed state, controlling the refrigeration control valve corresponding to the indoor unit to be in an open state, and controlling the four-way valve to switch; or after delay of the first preset time, controlling, by the shunt device, the heating control valve corresponding to the indoor unit to close, and controlling the second throttling component and the bypass valve to be in an open state, and after delay of the second preset time, controlling, by the shunt device, the second thrott
  • the method when the shunt device determines that the indoor unit is switched from a refrigeration mode to a heating mode according to the received mode switching instruction, and the switching flag bit of the four-way valve is 0, the method includes: after delay of a first preset time, controlling, by the shunt device, the refrigeration control valve corresponding to the indoor unit to close, and controlling the second throttling component and the first control valve to be in an open state, and after delay of a second preset time, controlling, by the shunt device, the second throttling component and the first control valve to be in a closed state, and controlling the heating control valve corresponding to the indoor unit to be in an open state; or after delay of a first preset time, controlling, by the shunt device, the refrigeration control valve corresponding to the indoor unit to close, and controlling the second throttling component and the bypass valve to be in an open state, after delay of the second preset time, controlling the second throttling component and the bypass valve to be in a closed state, and controlling the
  • the method when the shunt device determines that the indoor unit is switched from a refrigeration mode to a heating mode according to the received mode switching instruction, and the switching flag bit of the four-way valve is 1, the method includes: after delay of a first preset time, controlling, by the shunt device, the refrigeration control valve corresponding to the indoor unit to close, and controlling the second throttling component and the first control valve to be in an open state, and after delay of a second preset time, controlling, by the shunt device, the second throttling component and the first control valve to be in a closed state, controlling the heating control valve corresponding to the indoor unit to be in an open state, and controlling the four-way valve to switch; or after delay of the first preset time, controlling, by the shunt device, the refrigeration control valve corresponding to the indoor unit to close, and controlling the second throttling component and the bypass valve to be in an open state, and after delay of a second preset time, controlling, by the shunt device, the second th
  • inventions of an aspect of the present invention provide a multi-split air conditioning system.
  • the multi-split air conditioning system includes an outdoor unit, a plurality of indoor units and a shunt device.
  • the outdoor unit includes a compressor and a four-way valve.
  • the shunt device includes: a first heat exchange component, a second heat exchange component, a first throttling component arranged between an outlet of a first heat exchange flow path of the first heat exchange component and an inlet of a first heat exchange flow path of the second heat exchange component, a second throttling component arranged between an outlet of a first heat exchange flow path of the second heat exchange component and an inlet of a second heat exchange flow path of the second heat exchange component, a bypass valve arranged between the outlet of the first heat exchange flow path of the second heat exchange component and a low pressure pipeline of the shunt device, and a heating control valve and a refrigeration control valve corresponding to each indoor unit in the plurality of indoor units.
  • the first throttling component includes a first control valve.
  • the indoor unit When any indoor unit in plurality of indoor units receives a mode switching instruction, the indoor unit is configured to send the mode switching instruction to the shunt device.
  • the shunt device further includes a control module.
  • the control module is configured to: perform switching control on the heating control valve or the refrigeration control valve corresponding to the indoor unit according to the received mode switching instruction, release a pressure by controlling the second throttling component, the first control valve and the bypass valve to reduce a differential pressure across the refrigeration control valve or the heating control valve corresponding to the indoor unit, obtain a switching flag bit of the four-way valve, and control the refrigeration control valve or the heating control valve corresponding to the indoor unit and the four-way valve according to the switching flag bit of the four-way valve.
  • the indoor unit when any indoor unit in plurality of indoor units receives a mode switching instruction, the indoor unit is configured to send the mode switching instruction to the shunt device, the control module in the shunt device is configured to perform switching control on the heating control valve or the refrigeration control valve corresponding to the indoor unit according to the received mode switching instruction, release a pressure by controlling the second throttling component, the first control valve and the bypass valve to reduce a differential pressure across the refrigeration control valve or the heating control valve corresponding to the indoor unit, obtain a switching flag bit of the four-way valve, and control the refrigeration control valve or the heating control valve corresponding to the indoor unit and the four-way valve according to the switching flag bit of the four-way valve, such that hidden dangers of pipe cracking caused by the impact of refrigerant can be eliminated, the corresponding impact noise can be reduced, and the reliability and the noise quality of the system can be effectively improved.
  • the switching flag bit of the four-way valve includes 0 and 1.
  • an operating mode of the multi-split air conditioning system is switched from a main refrigeration mode to a pure refrigeration mode, or switched from the main refrigeration mode to the main refrigeration mode, or switched from a main heating mode to a pure heating mode, or switched from the main heating mode to the main heating mode.
  • the switching flag bit of the four-way valve is 1, the operating mode of the multi-split air conditioning system is switched from the main heating mode to the main refrigeration mode, or switched from the main refrigeration mode to the main heating mode, or switched from the main refrigeration mode to the pure heating mode, or switched from the main heating mode to a pure refrigeration mode.
  • the control module is configured to: after delay of a first preset time, control the heating control valve corresponding to the indoor unit to close, and control the second throttling component and the first control valve to be in an open state, after delay of a second preset time, control the second throttling component and the first control valve to be in a closed state, and control the refrigeration control valve corresponding to the indoor unit to be in an open state; or after delay of the first preset time, control the heating control valve corresponding to the indoor unit to close, and control the second throttling component and the bypass valve to be in an open state, after delay of the second preset time, control the second throttling component and the bypass valve to be in a closed state, and control the refrigeration control valve corresponding to the indoor unit to be in an open state.
  • the control module is configured to: after delay of a first preset time, control the heating control valve corresponding to the indoor unit to close, and control the second throttling component and the first control valve to be in an open state, after delay of a second preset time, control the second throttling component and the first control valve to be in a closed state, and control the refrigeration control valve corresponding to the indoor unit to be in an open state, and control the four-way valve to switch; or after delay of the first preset time, control the heating control valve of corresponding to the indoor unit to close, and control the second throttling component and the bypass valve to be in an open state, after delay of the second preset time, control the second throttling component and the bypass valve to be in a closed state, and controls the refrigeration control valve corresponding to the indoor unit to
  • the control is configured to: after delay of a first preset time, control the refrigeration control valve corresponding to the indoor unit to close, and control the second throttling component and the first control valve to be in an open state, after delay of a second preset time, control the second throttling component and the first control valve to be in a closed state, and control the heating control valve corresponding to the indoor unit to be in an open state; or after delay of the first preset time, control the refrigeration control valve corresponding to the indoor unit to close, and control the second throttling component and the bypass valve to be in an open state, after delay of the second preset time, control the second throttling component and the bypass valve to be in a closed state, and control the heating control valve corresponding to the indoor unit to be in the open state.
  • the control module is configured to: after delay of a first preset time, control the refrigeration control valve corresponding to the indoor unit to close, and control the second throttling component and the first control valve to be in an open state, after delay of a second preset time, control the second throttling component and the first control valve to be in a closed state, control the heating control valve corresponding to the indoor unit to be in an open state, and control the four-way valve to switch; or after delay of the first preset time, control the refrigeration control valve corresponding to the indoor unit to close, and control the second throttling component and the bypass valve to be in an open state, after delay of the second preset time, control the second throttling component and the bypass valve to be in a closed state, control the heating control valve corresponding to the indoor unit to be in the
  • outdoor unit 10 first indoor unit 21, second indoor unit 22, third indoor unit 23, fourth indoor unit 24, heating control valve SV1B, SV2B, SV3B and SV4B, refrigeration control valve SV1, SV2, SV3 and SV4, shunt device 30, first heat exchange component 31, second heat exchange component 32, first throttling component 33, second throttling component 34, bypass valve SVME, first control valve SVMC, first throttling element EXV2 and second control valve SVP.
  • Fig. 1 is a schematic diagram of a multi-split air conditioning system according to an embodiment of the present invention.
  • the multi-split air conditioning system includes an outdoor unit, a shunt device and a plurality of indoor units.
  • the outdoor unit includes a compressor and a four-way valve.
  • the shunt device includes: a first heat exchange component, a second heat exchange component, a first throttling component arranged between an outlet of a first heat exchange flow path of the first heat exchange component and an inlet of a first heat exchange flow path of the second heat exchange component, a second throttling component arranged between an outlet of a first heat exchange flow path of the second heat exchange component and an inlet of a second heat exchange flow path of the second heat exchange component, a bypass valve arranged between the outlet of the first heat exchange flow path of the second heat exchange component and a low pressure pipeline of the shunt device, and a heating control valve and a refrigeration control valve corresponding to each indoor unit in the plurality of indoor units.
  • the first throttling component includes a first control valve.
  • Fig. 2 is a flow chart of a method for controlling switching between operating modes of an indoor unit in a multi-split air conditioning system according to an embodiment of the present disclosure. As shown in Fig. 2 , the method for controlling switching between operating modes of an indoor unit in a multi-split air conditioning system may include the followings.
  • the indoor unit sends the mode switching instruction to a shunt device.
  • the shunt device performs switching control on a heating control valve or a refrigeration control valve corresponding to the indoor unit according to the received mode switching instruction, releases a pressure by controlling a second throttling component, a first control valve and a bypass valve to reduce a differential pressure across the refrigeration control valve or the heating control valve corresponding to the indoor unit, obtains a switching flag bit of a four-way valve, and controls the refrigeration control valve or the heating control valve corresponding to the indoor unit and the four-way valve according to the switching flag bit of the four-way valve.
  • the switching flag bit of the four-way valve includes 0 and 1.
  • the switching flag bit of the four-way valve is 0, the operating mode of the multi-split air conditioning system is switched from a main refrigeration mode to a pure refrigeration mode, or switched from the main refrigeration mode to the main refrigeration mode, or switched from a main heating mode to a pure heating mode, or switched from the main heating mode to the main heating mode.
  • the switching flag bit of the four-way valve is 1, the operating mode of the multi-split air conditioning system is switched from the main heating mode to the main refrigeration mode, or switched from the main refrigeration mode to the main heating mode, or switched from the main refrigeration mode to the pure heating mode, or switched from the main heating mode to a pure refrigeration mode.
  • the operating mode of the multi-split air conditioning system may include the main refrigeration mode, the main heating mode, the pure refrigeration mode and the pure heating mode.
  • the indoor unit in the multi-split air conditioning system performs the mode switching, the operating mode of the whole system (i.e., the operating mode of the outdoor unit) may be changed. For example, assuming that there are two indoor units in the multi-split air conditioning system, the indoor unit having a large refrigeration capacity operates in the heating mode, the indoor unit having a small refrigeration capacity operates in the refrigeration mode, and the multi-split air conditioning system operates in the main heating mode.
  • the multi-split air conditioning system may switch from the main heating mode to the pure refrigeration mode, in this case, large mode switching is involved, i. e., the four-way valve in the outdoor unit needs to be switched, and the switching flag bit of the four-way valve is 1.
  • the multi-split air conditioning system may switch from the main heating mode to the pure heating mode, in this case, small mode switching is involved, i.e., the four-way valve in the outdoor unit does not need to be switched, and the switching flag bit of the four-way valve is 0.
  • the indoor unit performs the mode switching, it is also necessary to determine whether the operating mode of the system needs to be switched, when the operating mode of the system needs to be switched, the switching flag bit of the four-way valve is 1, and when the operating mode of the system does not need to be switched, the switching flag bit of the four-way valve is 0. Then, the refrigeration control valve or the heating control valve corresponding to the indoor unit and the four-way valve are controlled according to the mode switching instruction and the switching flag bit of the four-way valve.
  • the shunt device when the shunt device determines that the indoor unit is switched from the heating mode to the refrigeration mode according to the received mode switching instruction, and the switching flag bit of the four-way valve is 0, the shunt device, after delay of a first preset time, controls the heating control valve corresponding to the indoor unit to close, and controls the second throttling component and the first control valve to be in an open state, after delay of a second preset time, the shunt device controls the second throttling component and the first control valve to be in a closed state, and controls the refrigeration control valve corresponding to the indoor unit to be in the open state.
  • the shunt device after delay of the first preset time, controls the heating control valve corresponding to the indoor unit to close, and controls the second throttling component and the bypass valve to be in an open state, after delay of the second preset time, the shunt device controls the second throttling component and the bypass valve to be in a closed state, and controls the refrigeration control valve corresponding to the indoor unit to be in the open state.
  • the first preset time and the second preset time can be calibrated according to actual situations.
  • the fourth indoor unit operates in the refrigeration mode (the refrigerant performs the refrigeration cycle along the dotted line), and the multi-split air conditioning system operates in the main heating mode.
  • the indoor unit When the first indoor unit (the indoor unit having a small refrigeration capacity) receives an instruction for switching from the heating mode to the refrigeration mode, the indoor unit sends the mode switching instruction to the shunt device, the shunt device determines that the multi-split air conditioning system is switched from the main heating mode to the main heating mode, i.e., the operating mode of system remains unchanged, in this case, the switching flag bit of the four-way valve is equal to 0.
  • the shunt device After delay of the first preset time, the shunt device, controls the heating control valve corresponding to the indoor unit to close, and controls the second throttling component and the first control valve to be in the open state (or controls the second throttling component and the bypass valve to be in the open state), the refrigerant passes through the first control valve and the indoor units operating in the heating mode, and flows into the low pressure pipe of the shunt device through the second throttling component, the pressure at the low pressure pipe can be increased in a short time, such that the differential pressure across the refrigeration control valve corresponding to the first indoor unit can be reduced.
  • the shunt device controls the second throttling component and the first control valve to be in the closed state (or controls the second throttling component and the bypass valve to be in the closed state), and controls the refrigeration control valve corresponding to the indoor unit to be in the open state, and the four-way valve keeps the current state unchanged.
  • the differential pressure across the refrigeration control valve can be effectively reduced, such that the instantaneous impact of the refrigerant on the corresponding pipe system can be effectively reduced, the noise caused by the impact of refrigerant can be reduced, and the reliability and noise quality of the system can be effectively improved.
  • the shunt device when the shunt device determines that the indoor unit is switched from the refrigeration mode to the heating mode according to the received mode switching instruction, and the switching flag bit of the four-way valve is 0, the shunt device, after delay of the first preset time, controls the refrigeration control valve corresponding to the indoor unit to close, and controls the second throttling component and the first control valve to be in the open state, after delay of the second preset time, the shunt device controls the second throttling component and the first control valve to be in the closed state, and controls the heating control valve corresponding to the indoor unit to be in the open state.
  • the shunt device after delay of the first preset time, controls the refrigeration control valve corresponding to the indoor unit to close, and controls the second throttling component and the bypass valve to be in the open state, after delay of the second preset time, the shunt device controls the second throttling component and the bypass valve to be in the closed state, and controls the heating control valve corresponding to the indoor unit to be in the open state.
  • the indoor unit receives the mode switching instruction for switching from the refrigeration mode to the heating mode
  • the indoor unit sends the mode switching instruction to the shunt device
  • the shunt device determines that the multi-split air conditioning system is switched from the main heating mode to the pure heating mode, in this case, the switching flag bit of the four-way valve is 0.
  • the shunt device controls the refrigeration control valve corresponding to the fourth indoor unit to close, and controls the second throttling component and the first control valve to be in the open state (or controls the second throttling component and the bypass valve to be in the open state) to release pressure, to reduce the differential pressure across the heating control valve corresponding to the fourth indoor unit. Then, after delay of the second preset time, the shunt device controls the second throttling component and the first control valve to be in the closed state (or controls the second throttling component and the bypass valve to be in the closed state), and controls the heating control valve corresponding to the indoor unit to be in the open state, and the four-way valve keeps the current state unchanged.
  • the differential pressure across the refrigeration control valve can be effectively reduced, such that the instantaneous impact of the refrigerant on the corresponding pipe system can be effectively reduced, the noise caused by the impact of refrigerant can be reduced, and the reliability and noise quality of the system can be effectively improved.
  • the shunt device when the shunt device determines that the indoor unit is switched from the heating mode to the refrigeration mode according to the received mode switching instruction, and the switching flag bit of the four-way valve is 1, the shunt device, after delay of the first preset time, controls the heating control valve corresponding to the indoor unit to close, and controls the second throttling component and the first control valve to be in the open state, after delay of the second preset time, the shunt device controls the second throttling component and the first control valve to be in the closed state, and controls the refrigeration control valve corresponding to the indoor unit to be in the open state and controls the four-way valve to switch.
  • the shunt device after delay of the first preset time, controls the heating control valve corresponding to the indoor unit to close, and controls the second throttling component and the bypass valve to be in the open state, after delay of the second time, the shunt device controls the second throttling component and the bypass valve to be in the closed state, and controls the refrigeration control valve corresponding to the indoor unit to be in the open state and controls the four-way valve to switch.
  • the best time for switching the refrigeration control valve is when the differential pressure across the refrigeration control valve (heating control valve) corresponding to the indoor unit in the shunt device is minimum. Therefore, when large mode switching is performed, the four-way valve and the refrigeration control valve (heating control valve) are operated simultaneously, which can effectively reduce the instantaneous impact of the refrigerant on the corresponding pipe system and reduce the noise caused by the impact of the refrigerant.
  • the second indoor unit receives the mode switching instruction for switching from the heating mode to the refrigeration mode
  • the indoor unit sends the mode switching instruction to the shunt device
  • the shunt device determines that the multi-split air conditioning system is switched from the main heating mode to the main refrigeration mode, in this case, the switching flag bit of the four-way valve is 1.
  • the shunt device after delay of the first preset time, controls the refrigeration control valve corresponding to the second indoor unit to close, and controls the second throttling component and the first control valve to be in the open state (or controls the second throttling component and the bypass valve to be in the open state) to release pressure, to reduce the differential pressure across the heating control valve corresponding to the second indoor unit.
  • the shunt device controls the second throttling component and the first control valve to be in the closed state (or controls the second throttling component and the bypass valve to be in the closed state), and controls the heating control valve corresponding to the indoor unit to be in the open state and simultaneously controls the four-way valve to switch, thereby effectively reducing the number of impacts of the refrigerant on the pipeline.
  • the differential pressure across the refrigeration control valve is minimum, and the impact is minimum during switching, and by controlling the second throttling component, the first control valve and the bypass valve, the differential pressure across the refrigeration control valve can be reduced, such that the differential pressure across the refrigeration control valve is smaller, thereby significantly improving the impact of refrigerant caused by the mode switching of the indoor unit, reducing the impact noise caused by the impact of refrigerant, and effectively improving the reliability and the noise quality of the system.
  • the shunt device when the shunt device determines that the indoor unit is switched from the refrigeration mode to the heating mode according to the received mode switching instruction, and the switching flag bit of the four-way valve is 1, the shunt device, after delay of the first preset time, controls the refrigeration control valve corresponding to the indoor unit to close, and controls the second throttling component and the first control valve to be in the open state, and after delay of the second time, the shunt device controls the second throttling component and the first control valve to be in the closed state, and controls the heating control valve corresponding to the indoor unit to be in the open state and controls the four-way valve to switch.
  • the shunt device after delay of the first preset time, controls the refrigeration control valve corresponding to the indoor unit to close, and controls the second throttling component and the bypass valve to be in the open state, and after delay of the second time, the shunt device controls the second throttling component and the bypass valve to be in the closed state, and controls the heating control valve corresponding to the indoor unit to be in the open state and controls the four-way valve to switch.
  • the fourth indoor unit operates in the heating mode
  • the multi-split air conditioning system operates in the main refrigeration mode.
  • the second indoor unit receives an instruction for switching from the refrigeration mode to the heating mode
  • the indoor unit sends the mode switching instruction to the shunt device
  • the shunt device determines that the multi-split air conditioning system is switched from the main refrigeration mode to the main heating mode, in this case, the switching flag bit of the four-way valve is equal to 1.
  • the shunt device after delay of the first preset time, controls the refrigeration control valve corresponding to the second indoor unit to close, and controls the second throttling component and the first control valve to be in the open state (or controls the second throttling component and the bypass valve to be in the open state) to release pressure, to reduce the differential pressure across the heating control valve corresponding to the second indoor unit.
  • the shunt device controls the second throttling component and the first control valve to be in the closed state (or controls the second throttling component and the bypass valve to be in the closed state) and controls the heating control valve corresponding to the indoor unit to be in the open state, and simultaneously controls the four-way valve to switch, thereby effectively reducing the number of impacts of the refrigerant on the pipeline.
  • the differential pressure across the heating control valve is minimum, and the impact is minimum during switching, and by controlling the second throttling component, the first control valve and the bypass valve, the differential pressure across the heating control valve can be reduced, such that the differential pressure across the heating control valve is smaller, thereby significantly improving the impact of refrigerant caused by mode switching of the indoor unit, reducing the impact noise caused by the impact of the refrigerant, and effectively improving the reliability and noise quality of the system.
  • FIG. 3 is a flow chart of a method for controlling switching between operating modes of an indoor unit in a multi-split air conditioning system according to an embodiment of the present invention.
  • the method for controlling switching between operating modes of an indoor unit in a multi-split air conditioning system may include the following operations:
  • the indoor unit when any indoor unit in the plurality of indoor units receives the mode switching instruction, the indoor unit sends the mode switching instruction to the shunt device, the shunt device performs switching control on the heating control valve or the refrigeration control valve corresponding to the indoor unit according to the received mode switching instruction, releases the pressure by controlling the second throttling component, the first control valve and the bypass valve to reduce the differential pressure across the refrigeration control valve or the heating control valve corresponding to the indoor unit, obtains the switching flag bit of the four-way valve, and controls the refrigeration control valve or the heating control valve corresponding to the indoor unit and the four-way valve according to the switching flag bit of the four-way valve, such that hidden dangers of pipe cracking caused by impact of refrigerant can be eliminated, the corresponding impact noise can be reduced, and the reliability and noise quality of the system can be effectively improved.
  • the multi-split air conditioning system may include an outdoor unit 10, a plurality of indoor units and a shunt device 30.
  • the outdoor unit includes a compressor and a four-way valve (not shown in the figure).
  • the shunt device 30 includes a first heat exchange component 31, a second heat exchange component 32, a first throttling component 33 arranged between an outlet of a first heat exchange flow path of the first heat exchange component 31 and an inlet of a first heat exchange flow path of the second heat exchange component 32, a second throttling component 34 arranged between an outlet of a first heat exchange flow path of the second heat exchange component 32 and an inlet of a second heat exchange flow path of the second heat exchange component 32, a bypass valve SVME arranged between the outlet of the first heat exchange flow path of the second heat exchange component 32 and a low pressure pipeline of the shunt device 30, a heating control valve and a refrigeration control valve corresponding to each indoor unit in the plurality of indoor units and a control module (not shown in the figure).
  • the first throttling component 33 includes a first control valve SVMC
  • a second throttle component 35 includes a first throttling element
  • the plurality of indoor units may include a first indoor unit 21, a second indoor unit 22, a third indoor unit 23 and a fourth indoor unit 24.
  • the first indoor unit 21 corresponds to a heating control valve SV1B and a refrigeration control valve SV1
  • the second indoor unit 22 corresponds to a heating control valve SV2B and a refrigeration control valve SV2
  • the third indoor unit 23 corresponds to a heating control valve SV3B and a refrigeration control valve SV3
  • the fourth indoor unit 24 corresponds to a heating control valve SV4B and a refrigeration control valve SV4.
  • the control module in the shunt device 30 is configured to perform switching control on the heating control valve or the refrigeration control valve corresponding to the indoor unit according to the received mode switching instruction, release a pressure by controlling the second throttling component 34, the first control valve SVMC and the bypass valve SVME to reduce the differential pressure across the refrigeration control valve or the heating control valve corresponding to the indoor unit, obtain a switching flag bit of the four-way valve, and control the refrigeration control valve or the heating control valve corresponding to the indoor unit and the four-way valve according to the switching flag bit of the four-way valve.
  • the switching flag bit of the four-way valve includes 0 and 1.
  • the switching flag bit of the four-way valve is 0, the operating mode of the multi-split air conditioning system is switched from a main refrigeration mode to a pure refrigeration mode, or switched from the main refrigeration mode to the main refrigeration mode, or switched from a main heating mode to a pure heating mode, or switched from the main heating mode to the main heating mode.
  • the switching flag bit of the four-way valve is 1, the operating mode of the multi-split air conditioning system is switched from the main heating mode to the main refrigeration mode, or switched from the main refrigeration mode to the main heating mode, or switched from the main refrigeration mode to the pure heating mode, or switched from the main heating mode to a pure refrigeration mode.
  • the control module when the control module determines that the indoor unit is switched from the heating mode to the refrigeration mode according to the received mode switching instruction, and the switching flag bit of the four-way valve is 0, the control module is configured to, after delay of a first preset time, control the heating control valve corresponding to the indoor unit to close, and control the second throttling component 34 and the first control valve SVMC to be in the open state, after delay of the second time, the control module is configured to control the second throttling component 34 and the first control valve SVMC to be in the closed state, and control the refrigeration control valve corresponding to the indoor unit to be in the open state.
  • control module is configured to, after delay of the first preset time, control the heating control valve corresponding to the indoor unit to close, and control the second throttling component 34 and the bypass valve SVME to be in the open state, after delay of the second time, the control module is configured to control the second throttling component 34 and the bypass valve SVME to be in the closed state, and control the refrigeration control valve corresponding to the indoor unit to be in the open state.
  • the control module when the control module determines that the indoor unit is switched from the refrigeration mode to the heating mode according to the received mode switching instruction, and the switching flag bit of the four-way valve is 0, the control module is configured to, after delay of a first preset time, control the refrigeration control valve corresponding to the indoor unit to close, and control the second throttling component 34 and the first control valve SVMC to be in the open state, after delay of the second time, the control module is configured to control the second throttling component 34 and the first control valve SVMC to be in the closed state, and control the heating control valve corresponding to the indoor unit to be in the open state.
  • control module is configured to, after delay of the first preset time, control the refrigeration control valve corresponding to the indoor unit to close, and control the second throttling component 34 and the bypass valve SVME to be in the open state, after delay of the second time, the control module is configured to control the second throttling component 34 and the bypass valve SVME to be in the closed state, and control the heating control valve corresponding to the indoor unit to be in the open state.
  • the control module determines that the indoor unit is switched from the heating mode to the refrigeration mode according to the received mode switching instruction, and the switching flag bit of the four-way valve is 1, the control module is configured to, after delay of the first preset time, control the heating control valve corresponding to the indoor unit to close, and control the second throttling component 34 and the first control valve SVMC to be in the open state, after delay of the second time, the control module is configured to control the second throttling component 34 and the first control valve SVMC to be in the closed state, and control the refrigeration control valve corresponding to the indoor unit to be in the open state and controls the four-way valve to switching.
  • control module is configured to, after delay of the first preset time, control the heating control valve corresponding to the indoor unit to close, and control the second throttling component 34 and the bypass valve SVME to be in the open state, after delay of the second time, the control module is configured to control the second throttling component 34 and the bypass valve SVME to be in the closed state, and control the refrigeration control valve corresponding to the indoor unit to be in the open state and control the four-way valve to switch.
  • the control module determines that the indoor unit is switched from the refrigeration mode to the heating mode according to the received mode switching instruction, and the switching flag bit of the four-way valve is 1, the control module is configured to, after delay of a first preset time, control the refrigeration control valve corresponding to the indoor unit to close, and control the second throttling component 34 and the first control valve SVMC to be in the open state, after delay of the second time, the control module is configured to control the second throttling component 34 and the first control valve SVMC to be in the closed state, and control the heating control valve corresponding to the indoor unit to be in the open state and control the four-way valve to switch.
  • control module is configured to, after delay of the first preset time, control the refrigeration control valve corresponding to the indoor unit to close, and control the second throttling component 34 and the bypass valve SVME to be in the open state, after delay of the second time, the control module is configured to control the second throttling component 34 and the bypass valve SVME to be in the closed state, and control the heating control valve corresponding to the indoor unit to be in the open state and control the four-way valve to switch.
  • the indoor unit when any indoor unit in a plurality of indoor units receives the mode switching instruction, the indoor unit sends the mode switching instruction to the shunt device, the shunt device performs switching control on the heating control valve or the refrigeration control valve corresponding to the indoor unit according to the received mode switching instruction, releases the pressure by controlling the second throttling component, the first control valve and the bypass valve to reduce the differential pressure across the refrigeration control valve or the heating control valve corresponding to the indoor unit, obtains a switching flag bit of the four-way valve, and controls the refrigeration control valve or the heating control valve corresponding to the indoor unit and the four-way valve according to the switching flag bit of the four-way valve, such that the hidden dangers of pipe cracking caused by impact of refrigerant can be eliminated, the corresponding impact noise can be reduced, and the reliability and noise quality of the system can be effectively improved.
  • first and second are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features.
  • the feature defined with “first” and “second” may include one or more this feature.
  • a plurality of' means at least two, for example, two or three, unless specified otherwise.
  • the terms “mounted,” “connected,” “coupled,” “fixed” and the like are used broadly, and may be, for example, fixed connections, detachable connections, or integral connections; may also be mechanical or electrical connections; may also be direct connections or indirect connections via intervening structures; may also be inner communications of two elements, which can be understood by those skilled in the art according to specific situations.
  • a structure in which a first feature is “on” or “below” a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are contacted via an additional feature formed therebetween.
  • a first feature "on,” “above,” or “on top of' a second feature may include an embodiment in which the first feature is right or obliquely “on,” “above,” or “on top of' the second feature, or just means that the first feature is at a height higher than that of the second feature.
  • a first feature "below,” “under,” or “on bottom of' a second feature may include an embodiment in which the first feature is right or obliquely “below,” “under,” or “on bottom of' the second feature, or just means that the first feature is at a height lower than that of the second feature.

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EP3517848A1 (en) 2019-07-31
EP3517848A4 (en) 2019-10-09
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CA3037194A1 (en) 2018-03-22
CN106440455B (zh) 2019-04-30
US20190212024A1 (en) 2019-07-11

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