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CN114353172A - Multi-split air conditioner, control method and storage medium - Google Patents

Multi-split air conditioner, control method and storage medium Download PDF

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Publication number
CN114353172A
CN114353172A CN202210067731.2A CN202210067731A CN114353172A CN 114353172 A CN114353172 A CN 114353172A CN 202210067731 A CN202210067731 A CN 202210067731A CN 114353172 A CN114353172 A CN 114353172A
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CN
China
Prior art keywords
heat exchanger
refrigerant port
indoor heat
port
compressor
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.)
Pending
Application number
CN202210067731.2A
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Chinese (zh)
Inventor
盖博
黎锦钊
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.)
TCL Air Conditioner Zhongshan Co Ltd
Original Assignee
TCL Air Conditioner Zhongshan Co Ltd
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Application filed by TCL Air Conditioner Zhongshan Co Ltd filed Critical TCL Air Conditioner Zhongshan Co Ltd
Priority to CN202210067731.2A priority Critical patent/CN114353172A/en
Publication of CN114353172A publication Critical patent/CN114353172A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • 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
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Sustainable Development (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a multi-split air conditioner, a control method and a storage medium, wherein the multi-split air conditioner comprises the following components: the multi-split air conditioner comprises a compressor, an outdoor heat exchanger and a plurality of indoor heat exchangers arranged in parallel, wherein a first inner refrigerant port of each indoor heat exchanger is communicated with the compressor, a first control valve is arranged at a second inner refrigerant port of each indoor heat exchanger, when the multi-split air conditioner is used for heating and defrosting, at least one indoor heat exchanger is communicated with a first outer refrigerant port of the outdoor heat exchanger through the first control valve, refrigerant of a high-pressure side refrigerant port of the compressor is subjected to heat exchange through the indoor heat exchangers without throttling, the refrigerant directly enters the outdoor heat exchanger for defrosting, the refrigerant after defrosting does not enter the indoor heat exchangers which are not started for heating and evaporate, and then returns to the compressor to form a complete refrigeration cycle, defrosting of the outdoor heat exchangers is realized, four-way valve reversing is not needed, and the refrigeration mode is switched. Guarantee indoor continuous heating, reinforcing travelling comfort.

Description

Multi-split air conditioner, control method and storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split air conditioner, a control method and a storage medium.
Background
The typical structure of the multi-split air conditioning system comprises a compressor, a four-way valve, an outdoor unit and a plurality of indoor units; the multi-split air conditioning system comprises a plurality of indoor units, a four-way valve, an outdoor unit, a compressor, a multi-split air conditioning system and a control system, wherein the indoor units are connected in parallel, the four-way valve is used for controlling the high-pressure side of the compressor to be communicated with the indoor units and the low-pressure side of the compressor to be communicated with the outdoor unit, or the high-pressure side of the compressor to be communicated with the outdoor unit and the low-pressure side of the compressor to be communicated with the indoor units, so that the multi-split air conditioning system can be switched between heating and cooling modes.
When the outdoor environment temperature is lower than the outer ring dew point value, the multi-split air conditioning system can frost on the outer surface of the outdoor unit when in the heating mode, and the frosted outdoor unit can influence the heat exchange effect of the heat exchanger, so that the air outlet temperature of the indoor unit is reduced. Therefore, the indoor unit needs to be defrosted regularly, the conventional defrosting method is to switch the multi-split air-conditioning system from a heating mode to a cooling mode, and the existing defrosting mode of the one-split multi-air-conditioner is refrigeration cycle defrosting. The defrosting of the refrigeration cycle is to make the system change from the heating cycle to the refrigeration cycle through a four-way reversing valve, at the moment, the outdoor heat exchanger is used as a condenser, and the defrosting is carried out by utilizing a high-temperature refrigerant entering the condenser. The defrosting mode can not supply heat to the indoor space in the defrosting process, so that the indoor temperature is reduced, and the comfort of users is influenced. Meanwhile, when the refrigeration cycle is used for defrosting, the indoor heat exchanger is used as an evaporator and can absorb heat in a room, and the comfort of a user is further reduced.
Disclosure of Invention
The embodiment of the invention provides a multi-split air conditioner, a control method and a storage medium, and aims to solve the problem that indoor heating cannot be realized in the defrosting process in the prior art.
On one hand, the embodiment of the invention provides a multi-split air conditioner, which comprises a compressor, an outdoor heat exchanger and a plurality of indoor heat exchangers, wherein the indoor heat exchangers are connected in parallel;
each indoor heat exchanger comprises a first inner refrigerant port and a second inner refrigerant port, and the outdoor heat exchanger comprises a first outer refrigerant port and a second outer refrigerant port;
the first inner refrigerant port of each indoor heat exchanger is communicated with the compressor, the second inner refrigerant port of each indoor heat exchanger is provided with a first control valve, the second inner refrigerant port of each indoor heat exchanger is communicated with the first outer refrigerant port or the second outer refrigerant port of the outdoor heat exchanger through the first control valve, when the multi-split air conditioner heats and defrosts, at least one indoor heat exchanger is communicated with the first outer refrigerant port of the outdoor heat exchanger through the first control valve, refrigerant of the compressor flows into the outdoor heat exchanger for defrosting after heat exchange, and after defrosting, the refrigerant in the outdoor heat exchanger flows through the second outer refrigerant port and then enters the rest indoor heat exchangers through the first control valves corresponding to the rest indoor heat exchangers.
In some embodiments of the present invention, it is preferred that,
when the multi-split air conditioner heats and defrosts, the second inner refrigerant port of at least one indoor heat exchanger is communicated with the first outer refrigerant port of the outdoor heat exchanger through the corresponding first control valve, and the second inner refrigerant ports of the rest indoor heat exchangers are connected with the second outer refrigerant port of the outdoor heat exchanger through the corresponding first control valve.
In some embodiments of the present invention, a second control valve is disposed at the first inner refrigerant port of each of the indoor heat exchangers;
when the multi-split air conditioner heats and defrosts, the first inner refrigerant port of at least one indoor heat exchanger is communicated with the high-pressure side refrigerant port of the compressor through the corresponding second control valve, and the first inner refrigerant ports of the rest indoor heat exchangers are communicated with the low-pressure side refrigerant port of the compressor through the corresponding second control valve.
In some embodiments of the invention, the first control valve comprises a first heat exchange valve and a first throttle valve;
a second inner refrigerant port of the indoor heat exchanger is connected with a first outer refrigerant port of the outdoor heat exchanger through the first heat exchange valve, and a second inner refrigerant port of the indoor heat exchanger is connected with a second outer refrigerant port of the outdoor heat exchanger through the first throttling valve;
when the multi-split air conditioner heats and defrosts, the second inner refrigerant port of at least one indoor heat exchanger is communicated with the first outer refrigerant port of the outdoor heat exchanger through the corresponding first heat exchange valve, and the second inner refrigerant ports of the rest indoor heat exchangers are communicated with the second outer refrigerant port of the outdoor heat exchanger through the corresponding first throttle valve.
In some embodiments of the invention, the first control valve is a two-position, three-way valve including a first operating position and a second operating position;
when the two-position three-way valve is at the first working position, a second inner refrigerant port of the indoor heat exchanger is communicated with a first outer refrigerant port of the outdoor heat exchanger, and the second inner refrigerant port of the indoor heat exchanger is disconnected with a second outer refrigerant port of the outdoor heat exchanger;
when the two-position three-way valve is at the second working position, the second inner refrigerant port of the indoor heat exchanger is disconnected with the first outer refrigerant port of the outdoor heat exchanger, and the second inner refrigerant port of the indoor heat exchanger is communicated with the second outer refrigerant port of the outdoor heat exchanger.
In some embodiments of the invention, the second control valve comprises a second high pressure/low pressure side control valve and a second low pressure/high pressure side control valve;
a first inner refrigerant port of the indoor heat exchanger is connected with a high-pressure side refrigerant port of the compressor through the second high-pressure/low-pressure side control valve, and the first inner refrigerant port of the indoor heat exchanger is connected with a low-pressure side refrigerant port of the compressor through the second low-pressure/high-pressure side control valve;
when the multi-split air conditioner heats and defrosts, the first inner refrigerant port of at least one indoor heat exchanger is communicated with the high-pressure side refrigerant port of the compressor through the corresponding second high-pressure/low-pressure side control valve, and the first inner refrigerant ports of the rest indoor heat exchangers are communicated with the low-pressure side refrigerant port of the compressor through the corresponding second low-pressure/high-pressure side control valves.
In some embodiments of the invention, the second control valve is a two-position, three-way valve including a first operating position and a second operating position;
when the two-position three-way valve is at the first working position, a first inner refrigerant port of the indoor heat exchanger is communicated with a high-pressure side refrigerant port of the compressor, and the first inner refrigerant port of the indoor heat exchanger is disconnected with a low-pressure side refrigerant port of the compressor;
when the two-position three-way valve is at the second working position, a first inner refrigerant port of the indoor heat exchanger is disconnected with a high-pressure side refrigerant port of the compressor, and the first inner refrigerant port of the indoor heat exchanger is communicated with a low-pressure side refrigerant port of the compressor.
On the other hand, an embodiment of the present invention provides a method for controlling a multi-split air conditioner, where the method for controlling a multi-split air conditioner includes:
if the multi-split air conditioner starts a defrosting mode, determining a first target indoor heat exchanger in a plurality of indoor heat exchangers according to states of the plurality of indoor heat exchangers in the multi-split air conditioner, wherein the states comprise opening and closing, and the first target indoor heat exchanger is an indoor heat exchanger which is opened in the state;
controlling a first control valve corresponding to the first target indoor heat exchanger, disconnecting a second inner refrigerant port of the first target indoor heat exchanger from a second outer refrigerant port of an outdoor heat exchanger, and communicating the second inner refrigerant port of the first target indoor heat exchanger with a first outer refrigerant port of the outdoor heat exchanger, wherein the first control valve is used for communicating or disconnecting the second inner refrigerant port of the first target indoor heat exchanger with the outdoor heat exchanger in the multi-split air conditioner;
and (3) enabling the refrigerant flowing out of the refrigerant port on the high-pressure side of the compressor to flow into the first target indoor heat exchanger for heat exchange, and enabling the refrigerant after heat exchange to flow into the outdoor heat exchanger for defrosting.
In some embodiments of the present invention, the control method of the multi-split air conditioner further includes:
acquiring a second target indoor heat exchanger in the indoor heat exchangers according to the state of each indoor heat exchanger, wherein the second target indoor heat exchanger is an indoor heat exchanger which is closed in the state;
communicating a second inner refrigerant port of the second target indoor heat exchanger with a second outer refrigerant port of the outdoor heat exchanger, and disconnecting the second inner refrigerant port of the second target indoor heat exchanger from the first outer refrigerant port of the outdoor heat exchanger, so that the refrigerant in the outdoor heat exchanger enters the second target indoor heat exchanger to be evaporated;
disconnecting a first inner refrigerant port of the second target indoor heat exchanger from a high-pressure side refrigerant port of the compressor, and communicating the first inner refrigerant port of the second target indoor heat exchanger with a low-pressure side refrigerant port of the compressor, so that the refrigerant evaporated in the second target indoor heat exchanger returns to the compressor through the low-pressure side refrigerant port.
In some embodiments of the present invention, after the refrigerant flowing out of the high-pressure side refrigerant port of the compressor flows into the first target indoor heat exchanger for heat exchange and flows into the outdoor heat exchanger for defrosting, the method includes:
acquiring a new surface temperature of the outdoor heat exchanger, and determining whether to exit the defrosting mode or not according to the new surface temperature and/or the time length for operating the defrosting mode;
and if the defrosting mode is exited, disconnecting the second inner refrigerant port of the first target indoor heat exchanger from the first outer refrigerant port of the outdoor heat exchanger, and communicating the second inner refrigerant port of the first target indoor heat exchanger with the second outer refrigerant port of the outdoor heat exchanger.
In another aspect, an embodiment of the present invention provides a storage medium, where a plurality of instructions are stored, and the instructions are suitable for being loaded by a processor to perform the steps in the method for controlling a multi-split air conditioner.
According to the embodiment of the invention, the first control valve is added on the second inner refrigerant port of the indoor heat exchanger on the basis of the existing multi-split air conditioner, when the multi-split air conditioner is used for heating and defrosting, at least one indoor heat exchanger is communicated with the first outer refrigerant port of the outdoor heat exchanger through the first control valve, refrigerant of a high-pressure side refrigerant port of the compressor exchanges heat and flows into the outdoor heat exchanger for defrosting, when high-temperature and high-pressure refrigerant extruded by the compressor exchanges heat through the indoor heat exchanger, throttling is not carried out, the refrigerant directly enters the outdoor heat exchanger for defrosting, and the defrosted refrigerant returns to the compressor after entering the indoor heat exchanger which is not started for heating to evaporate, so that a complete refrigeration cycle is formed, defrosting of the outdoor heat exchanger is realized, reversing of the four-way valve is not needed, and the refrigeration mode is switched. Guarantee indoor continuous heating, reinforcing travelling comfort.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a multi-split air conditioner provided by an embodiment of the invention;
fig. 2 is a schematic flow direction diagram of a refrigerant of a multi-split air conditioner in a heating defrosting mode according to an embodiment of the present invention;
fig. 3 is a schematic flow direction diagram of a refrigerant in a heating mode of a multi-split air conditioner according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another embodiment of a multi-split air conditioner according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a method for controlling a multi-split air conditioner according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating defrosting in a control method of a multi-split air conditioner according to an embodiment of the present invention.
Wherein, the corresponding relationship between the names and the reference numbers of the components in fig. 1 to fig. 4 is:
101, a compressor: a Dy1 low-pressure side refrigerant port and a Hy1 high-pressure side refrigerant port;
102 outdoor heat exchanger: oi1 first external refrigerant port, Oi2 second external refrigerant port;
103 first indoor heat exchanger, 104 second indoor heat exchanger: io1 first inner refrigerant port, Io2 second inner refrigerant port;
a first control valve: SV1 first throttle valve, SV2 first heat exchange valve; 401 first two-position three-way valve: the switch comprises a sw11 first port, a sw12 second port and a sw13 third port;
a second control valve: SV3 second high pressure/low pressure side control valve, SV4 second low pressure/high pressure side control valve; 402 second two-position three-way valve: the switch comprises a sw21 first port, a sw22 second port and a sw23 third port;
105 four-way valve, 106 outdoor heat exchange valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a multi-split air conditioner, a control method and a storage medium.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a multi-split air conditioner provided in an embodiment of the present invention, the multi-split air conditioner includes a compressor 101, an outdoor heat exchanger 102, and a first indoor heat exchanger 103 and a second indoor heat exchanger 104 which are arranged in parallel, the first indoor heat exchanger 103 and the second indoor heat exchanger 104 both include a first inner refrigerant port Io1 and a second inner refrigerant port Io2, and the outdoor heat exchanger 102 includes a first outer refrigerant port Oi1 and a second outer refrigerant port Oi 2. It should be noted that, in order to better understand the working principle of the multi-split air conditioner according to the embodiment of the present invention, the embodiment of the present invention takes the multi-split air conditioner including two indoor heat exchangers as an example to explain the structure and the working principle of the multi-split air conditioner, and of course, the number of the indoor heat exchangers in the multi-split air conditioner provided by the embodiment of the present invention may be multiple, where multiple refers to two or more integer numbers, and therefore, the specific number of the indoor heat exchangers in the multi-split air conditioner provided by the embodiment of the present invention does not limit the protection scope of the present invention.
In the multi-split air conditioner shown in fig. 1, the first inner refrigerant port Io1 of each of the indoor heat exchangers communicates with the high-pressure side refrigerant port Hy1 of the compressor 101, the second inner refrigerant port Io2 of each of the indoor heat exchangers is provided with a first control valve provided between the second inner refrigerant port Io2 of each of the indoor heat exchangers and the first outer refrigerant port Oi1 of the outdoor heat exchanger 102 and the second outer refrigerant port Oi2 of the outdoor heat exchanger 102, and each of the indoor heat exchangers communicates with the first outer refrigerant port Oi1 of the outdoor heat exchanger 102 or the second outer refrigerant port Oi2 of the outdoor heat exchanger 102 through the first control valve.
As shown in fig. 1, each indoor heat exchanger provided by the embodiment of the present invention is provided with a first control valve. A first control valve is arranged between the second inner refrigerant port Io2 of the first indoor heat exchanger 103 and the first outer refrigerant port Oi1 of the outdoor heat exchanger 102 and the second outer refrigerant port Oi2 of the outdoor heat exchanger 102, and the second inner refrigerant port Io2 of the first indoor heat exchanger 103 is communicated with the first outer refrigerant port Oi1 of the outdoor heat exchanger 102 or the second outer refrigerant port Oi2 of the outdoor heat exchanger 102 through the first control valve; a second first control valve is provided between the second inner refrigerant port Io2 of the second indoor heat exchanger 104 and the first outer refrigerant port Oi1 of the outdoor heat exchanger 102 and the second outer refrigerant port Oi2 of the outdoor heat exchanger 102, and the second inner refrigerant port Io2 of the second indoor heat exchanger 104 is communicated with the first outer refrigerant port Oi1 of the outdoor heat exchanger 102 or the second outer refrigerant port Oi2 of the outdoor heat exchanger 102 through the second first control valve.
In some embodiments of the present invention, when the multi-split air conditioner performs heating defrosting, at least one indoor heat exchanger communicates with the first external refrigerant port Oi1 of the outdoor heat exchanger 102 through a first control valve, and the refrigerant of the compressor 101 exchanges heat and flows into the outdoor heat exchanger 102 for defrosting. For example, in the multi-split air conditioner shown in fig. 1, taking an example that the first indoor heat exchanger 103 heats and the second indoor heat exchanger 104 is idle, when the multi-split air conditioner operates in a heating and defrosting mode, the second inner refrigerant port Io2 of the first indoor heat exchanger 103 is communicated with the first outer refrigerant port Oi1 of the outdoor heat exchanger 102 through a corresponding first control valve and is disconnected from the second outer refrigerant port Oi2 of the outdoor heat exchanger 102, the second indoor heat exchanger 104 is disconnected from the first outer refrigerant port Oi1 of the outdoor heat exchanger 102 through a corresponding second first control valve and is communicated with the second outer refrigerant port Oi2 of the outdoor heat exchanger 102, the refrigerant flowing out of the compressor 101 enters the first indoor heat exchanger 103 through the first inner refrigerant port Io 387 2 of the first indoor heat exchanger 103 to exchange heat, after heat exchange, enters the outdoor heat exchanger 102 through the first outer refrigerant port Oi1 of the first outdoor heat exchanger 102 to defrost, after defrosting, the refrigerant in the outdoor heat exchanger 102 flows out of the second external refrigerant port Oi2 of the outdoor heat exchanger 102, enters the second indoor heat exchanger 104, and finally returns to the compressor 101 through the first internal refrigerant port Io1 of the second indoor heat exchanger 104.
The multi-split air conditioner shown in fig. 1 further includes a four-way valve 105 and an outdoor heat exchange valve 106. The four-way valve 105 is connected to a high-pressure side refrigerant port Hy1 of the compressor 101, a low-pressure side refrigerant port Dy1 of the compressor 101, a first external refrigerant port Oi1 of the outdoor heat exchanger 102, and a first internal refrigerant port Io1 of each indoor heat exchanger, respectively; the outdoor heat exchange valve 106 is disposed between the first outdoor refrigerant port Oi1 of the outdoor heat exchanger 102 and the four-way valve 105, and the outdoor heat exchange valve 106 is configured to control disconnection or communication between the first outdoor refrigerant port Oi1 of the outdoor heat exchanger 102 and the four-way valve 105, and to control disconnection or communication between a second branch corresponding to the first indoor refrigerant port Io1 of the first indoor heat exchanger 103 and the four-way valve 105.
In some embodiments of the present invention, in the multi-split air conditioner shown in fig. 1, taking an example that the first indoor heat exchanger 103 heats and the second indoor heat exchanger 104 is idle, when the multi-split air conditioner operates in the heating and defrosting mode, the outdoor heat exchange valve 106 is turned off, that is, the second branch corresponding to the first inner refrigerant port Io1 of the first indoor heat exchanger 103 is turned off from the four-way valve 105, the first outer refrigerant port Oi1 of the outdoor heat exchanger 102 is turned off from the four-way valve 105, the second branch corresponding to the first inner refrigerant port Io1 of the second indoor heat exchanger 104 is connected to the low-pressure side refrigerant port Dy1 of the compressor 101 through the four-way valve 105, and the refrigerant in the second indoor heat exchanger 104 flows through the four-way valve 105 and then enters the compressor 101 through the low-pressure side refrigerant port Dy1 of the compressor 101.
According to the embodiment of the invention, a first control valve is added on the basis of the existing multi-split air conditioner at the second inner refrigerant port Io2 of an indoor heat exchanger, when the multi-split air conditioner is used for heating and defrosting, at least one indoor heat exchanger is communicated with the first outer refrigerant port Oi1 of an outdoor heat exchanger 102 through the first control valve, the refrigerant of a high-pressure side refrigerant port Hy1 of a compressor 101 is subjected to heat exchange and then flows into the outdoor heat exchanger 102 for defrosting, when the high-temperature and high-pressure refrigerant pressed out by the compressor 101 is subjected to heat exchange through the indoor heat exchanger, throttling is not performed, the high-temperature and high-pressure refrigerant directly enters the outdoor heat exchanger 102 for defrosting, the defrosted refrigerant enters the indoor heat exchanger which is not started for heating and evaporates and then returns to the compressor 101, a complete refrigeration cycle is formed, defrosting of the outdoor heat exchanger 102 is realized, four-way valve reversing is not needed, and the refrigeration mode is switched. Guarantee indoor continuous heating, reinforcing travelling comfort.
In some embodiments of the present invention, as shown in fig. 1, in the multi-split air conditioner provided in the embodiment of the present invention, the first inner refrigerant port Io1 of each of the indoor heat exchangers is provided with a second control valve, the second control valve is provided between the first inner refrigerant port Io1 of each of the indoor heat exchangers and the high-pressure side refrigerant port Hy1 of the compressor 101 or the low-pressure side refrigerant port Dy1 of the compressor 101, and each of the indoor heat exchangers is communicated with the high-pressure side refrigerant port Hy1 of the compressor 101 or the low-pressure side refrigerant port Dy1 of the compressor 101 through the second control valve.
In some embodiments of the present invention, as shown in fig. 1, a first second control valve is disposed between the first inner refrigerant port Io1 of the first indoor heat exchanger 103 and the high-pressure side refrigerant port Hy1 of the compressor 101 and the low-pressure side refrigerant port Dy1 of the compressor 101, and the first inner refrigerant port Io1 of the first indoor heat exchanger 103 is communicated with the high-pressure side refrigerant port Hy1 of the compressor 101 or the low-pressure side refrigerant port Dy1 of the compressor 101 through the first second control valve; a second control valve is provided between the first inner refrigerant port Io1 of the second indoor heat exchanger 104 and the high-pressure side refrigerant port Hy1 of the compressor 101 and the low-pressure side refrigerant port Dy1 of the compressor 101, and the first inner refrigerant port Io1 of the second indoor heat exchanger 104 is communicated with the high-pressure side refrigerant port Hy1 of the compressor 101 or the low-pressure side refrigerant port Dy1 of the compressor 101 through the second control valve.
In some embodiments of the present invention, the second control valve may be disposed on a first branch of the first internal refrigerant port Io1 of each indoor heat exchanger, may be disposed on a second branch of the first internal refrigerant port Io1 of each indoor heat exchanger, and may be disposed on the first branch and the second branch of the first internal refrigerant port Io1 of each indoor heat exchanger, respectively; the first internal refrigerant port Io1 may be disposed in each indoor heat exchanger, one end of the second control valve may be connected to the first internal refrigerant port Io1 of each indoor heat exchanger, and the other end of the second control valve may be connected to the first branch and the second branch of the first internal refrigerant port Io1 of each indoor heat exchanger, respectively. For example, in the case where the second control valves are respectively disposed in the first branch and the second branch of the first inner refrigerant port Io1 of each indoor heat exchanger, as shown in fig. 1, the second control valves include a second high pressure/low pressure side control valve SV3 and a second low pressure/high pressure side control valve SV4, the first inner refrigerant port Io1 of the first indoor heat exchanger 103 and the first inner refrigerant port Io1 of the second indoor heat exchanger 104 are respectively connected to or disconnected from the high pressure side refrigerant port Hy1 of the compressor 101 through the corresponding second high pressure/low pressure side control valve SV3, and the first inner refrigerant port Io1 of the first indoor heat exchanger 103 and the first inner refrigerant port Io1 of the second indoor heat exchanger 104 are respectively connected to or disconnected from the low pressure side refrigerant port Dy1 of the compressor 101 through the corresponding second low pressure/high pressure side control valve SV 4.
In detail, as shown in fig. 1, the second high pressure/low pressure side control valve SV3 is provided in a first branch corresponding to each of the first inner refrigerant port Io1 of the first indoor heat exchanger 103 and the first inner refrigerant port Io1 of the second indoor heat exchanger 104, and the second low pressure/high pressure side control valve SV4 is provided in a second branch corresponding to each of the first inner refrigerant port Io1 of the first indoor heat exchanger 103 and the first inner refrigerant port Io1 of the second indoor heat exchanger 104. Taking the first indoor heat exchanger 103 for heating and the second indoor heat exchanger 104 for idling as an example, when the multi-split air conditioner operates in the heating and defrosting mode, the second high-pressure/low-pressure side control valve SV3 on the first branch corresponding to the first internal refrigerant port Io1 of the first indoor heat exchanger 103 is opened, and the second low-pressure/high-pressure side control valve SV4 on the second branch corresponding to the first internal refrigerant port Io1 of the first indoor heat exchanger 103 is disconnected, that is, the first internal refrigerant port Io1 of the first indoor heat exchanger 103 is communicated with the high-pressure side refrigerant port Hy1 of the compressor 101, and the first internal refrigerant port Io1 of the first indoor heat exchanger 103 is disconnected from the low-pressure side refrigerant port Dy1 of the compressor 101; the second high pressure/low pressure side control valve SV3 on the first branch corresponding to the first interior refrigerant port Io1 of the second indoor heat exchanger 104 is turned off, the second low pressure/high pressure side control valve SV4 on the second branch corresponding to the first interior refrigerant port Io1 of the second indoor heat exchanger 104 is turned on, that is, the first interior refrigerant port Io1 of the second indoor heat exchanger 104 is turned off from the high pressure side refrigerant port Hy1 of the compressor 101, and the first interior refrigerant port Io1 of the first indoor heat exchanger 103 is communicated with the low pressure side refrigerant port Dy1 of the compressor 101.
In some embodiments of the present invention, embodiments of the present invention provide that the first control valve comprises a first heat exchange valve SV2 and a first throttle valve SV 1. As shown in fig. 1, the first heat exchange valve SV2 is disposed between the second inner refrigerant port Io2 of each indoor heat exchanger and the first outer refrigerant port Oi1 of the outdoor heat exchanger 102, and the first inner refrigerant port Io1 of each indoor heat exchanger is communicated with or disconnected from the first outer refrigerant port Oi1 of the outdoor heat exchanger 102 through the first heat exchange valve SV 2; the first throttle valve SV1 is disposed between the second inner refrigerant port Io2 of each indoor heat exchanger and the second outer refrigerant port Oi2 of the outdoor heat exchanger 102, and the first inner refrigerant port Io1 of each indoor heat exchanger is connected to or disconnected from the second outer refrigerant port Oi2 of the outdoor heat exchanger 102 by a first heat exchanging valve SV 2.
When the multi-split air conditioner performs heating and defrosting, that is, when the multi-split air conditioner operates in a heating and defrosting mode, taking the example that the first indoor heat exchanger 103 is turned on and the second indoor heat exchanger 104 is turned off, the first indoor heat exchanger 103 communicates with the first external refrigerant port Oi1 of the outdoor heat exchanger 102 through a corresponding first control valve, and the refrigerant of the compressor 101 exchanges heat and flows into the outdoor heat exchanger 102 to perform defrosting. A first heat exchange valve SV2 corresponding to a second inner refrigerant port Io2 of the first indoor heat exchanger 103 is opened, and a first throttle valve SV1 corresponding to a second inner refrigerant port Io2 of the first indoor heat exchanger 103 is disconnected, namely the second inner refrigerant port Io2 of the first indoor heat exchanger 103 is communicated with a first outer refrigerant port Oi1 of the outdoor heat exchanger 102, and a second inner refrigerant port Io2 of the first indoor heat exchanger 103 is disconnected with a second outer refrigerant port Oi2 of the outdoor heat exchanger 102; the first heat exchange valve SV2 corresponding to the second indoor heat exchanger 104 is turned off, and the first throttle valve SV1 corresponding to the first indoor heat exchanger 103 is opened, that is, the second inner refrigerant port Io2 of the first indoor heat exchanger 103 is disconnected from the first outer refrigerant port Oi1 of the outdoor heat exchanger 102, and the second inner refrigerant port Io2 of the first indoor heat exchanger 103 is communicated with the second outer refrigerant port Oi2 of the outdoor heat exchanger 102; the second high pressure/low pressure side control valve SV3 corresponding to the first interior refrigerant port Io1 of the first interior heat exchanger 103 is opened, the second low pressure/high pressure side control valve SV4 corresponding to the first interior refrigerant port Io1 of the first interior heat exchanger 103 is cut off, that is, the first interior refrigerant port Io1 of the first interior heat exchanger 103 is communicated with the high pressure side refrigerant port Hy1 of the compressor 101, the first interior refrigerant port Io1 of the first interior heat exchanger 103 is cut off from the low pressure side refrigerant port Dy1 of the compressor 101, the second high pressure/low pressure side control valve SV3 corresponding to the first interior refrigerant port Io1 of the second interior heat exchanger 104 is cut off, the second low pressure/high pressure side control valve SV4 corresponding to the first interior refrigerant port Io1 of the second interior heat exchanger 104 is opened, that is, that the first interior refrigerant port Io1 of the second interior heat exchanger 104 is cut off from the high pressure side refrigerant port Hy1 of the compressor 101, and the first interior refrigerant port Io1 of the second interior refrigerant port 101 is communicated with Dy of the low pressure side refrigerant port 1 of the compressor 101, the first indoor heat exchanger 103 exchanges heat with the refrigerant of the compressor 101, flows into the outdoor heat exchanger 102 to defrost the refrigerant, and then the refrigerant defrosted in the outdoor heat exchanger 102 flows into the second indoor heat exchanger 104 to evaporate the refrigerant, and then flows through the low-pressure side refrigerant port Dy1 of the compressor 101 to return to the compressor 101.
Specifically, the multi-split air conditioner shown in fig. 2 has a refrigerant flow direction in the heating and defrosting mode (the refrigerant flow direction is indicated by an arrow in fig. 2): a high-temperature and high-pressure refrigerant in the compressor 101 flows through the first indoor heat exchanger 103 corresponding to the second high-pressure/low-pressure side control valve SV3, and enters the first indoor heat exchanger 103 through a first internal refrigerant port Io1 of the first indoor heat exchanger 103 to exchange heat; the first indoor heat exchanger 103 flows out the heat-exchanged refrigerant through the second inner refrigerant port Io2 of the first indoor heat exchanger 103, and flows through the first heat exchange valve SV2 corresponding to the first indoor heat exchanger 103, and then enters the outdoor heat exchanger 102 through the first outer refrigerant port Oi1 of the outdoor heat exchanger 102, the frost layer on the surface of the outdoor heat exchanger 102 is heated and gradually reduced until ablation, the refrigerant in the outdoor heat exchanger 102 flows out through the second outer refrigerant port Oi2 of the outdoor heat exchanger 102, flows through the first throttle valve SV1, flows into the second heat exchanger through the second inner refrigerant port Io2 of the second indoor heat exchanger 104 to be evaporated, flows out through the first inner refrigerant port Io1 of the second indoor heat exchanger 104, flows through the second low-pressure/high-pressure side control valve SV4 corresponding to the second indoor heat exchanger 104, and then returns to the compressor 101 through the low-pressure side port Dy1 of the compressor 101.
When the multi-split air conditioner operates in a heating mode: opening a first throttle valve SV1 corresponding to each of a second inner refrigerant port Io2 of the first indoor heat exchanger 103 and a second inner refrigerant port Io2 of the second indoor heat exchanger 104, and opening a first heat exchange valve SV2 corresponding to each of a second inner refrigerant port Io2 of the first indoor heat exchanger 103 and a second inner refrigerant port Io2 of the second indoor heat exchanger 104, that is, each of a second inner refrigerant port Io2 of the first indoor heat exchanger 103 and a second inner refrigerant port Io2 of the second indoor heat exchanger 104 is communicated with a second outer refrigerant port Oi2 of the outdoor heat exchanger 102, and each of a second inner refrigerant port Io2 of the first indoor heat exchanger 103 and a second inner refrigerant port Io2 of the second indoor heat exchanger 104 is disconnected from a first outer refrigerant port Oi1 of the outdoor heat exchanger 102; opening a second high-pressure/low-pressure side control valve SV3 corresponding to each of a first inner refrigerant port Io1 of the first indoor heat exchanger 103 and a first inner refrigerant port Io1 of the second indoor heat exchanger 104, and opening a second low-pressure/high-pressure side control valve SV4 corresponding to each of a first inner refrigerant port Io1 of the first indoor heat exchanger 103 and a first inner refrigerant port Io1 of the second indoor heat exchanger 104, that is, the first inner refrigerant port Io1 of the first indoor heat exchanger 103 and the first inner refrigerant port Io1 of the second indoor heat exchanger 104 are respectively communicated with a high-pressure side refrigerant port Hy1 of the compressor 101, and the first inner refrigerant port Io1 of the first indoor heat exchanger 103 and the first inner refrigerant port Io1 of the second indoor heat exchanger 104 are respectively disconnected from a low-pressure side refrigerant port Dy1 of the compressor 101; the outdoor heat exchange valve 106 corresponding to the first external refrigerant port Oi1 of the outdoor heat exchanger 102 is opened, that is, the first external refrigerant port Oi1 of the outdoor heat exchanger 102 is communicated with the low-pressure side refrigerant port Dy1 of the compressor 101.
Specifically, the flow direction of the refrigerant in the multi-split air conditioner in the heating mode is as shown in fig. 3 (the flow direction of the refrigerant is indicated by an arrow in fig. 3): the high-temperature high-pressure refrigerant flowing out of a high-pressure side refrigerant port Hy1 of the compressor 101 is divided into two paths, the first path of refrigerant enters the first indoor heat exchanger 103 from a first inner refrigerant port Io1 of the first indoor heat exchanger 103, the second path of refrigerant enters the second indoor heat exchanger 104 from a first inner refrigerant port Io1 of the second indoor heat exchanger 104, the refrigerant exchanges heat with the indoor environment in the first indoor heat exchanger 103 and the second indoor heat exchanger 104 to release heat and flows out, then flows through first throttling valves SV1 corresponding to the first indoor heat exchanger 103 and the second indoor heat exchanger 104 respectively, enters the outdoor heat exchanger 102 through a second outer refrigerant port Oi2 of the outdoor heat exchanger 102, evaporates in the outdoor heat exchanger 102 and flows out, finally flows through the outdoor heat exchange valve 106 and returns to the compressor 101 through a low-pressure side refrigerant port Dy1 of the compressor 101, and a heating cycle is completed.
On the basis of the existing multi-split air conditioner, a first control valve is added to a second internal refrigerant port Io2 of each indoor heat exchanger, a second control valve is added to a first internal refrigerant port Io1 of each indoor heat exchanger, when the surface of the outdoor heat exchanger 102 frosts, the outdoor heat exchanger 102 and the indoor heat exchangers can be connected in series, and high-temperature and high-pressure refrigerant pressed out by a compressor 101 directly enters the outdoor heat exchanger 102 for defrosting without throttling after heat exchange is carried out by the indoor heat exchangers; and one of the indoor heat exchangers which is not started for heating is selected as an evaporator, and the defrosted refrigerant enters the indoor heat exchanger which is not started for heating to evaporate and then returns to the compressor 101 to form a complete refrigeration cycle, so that the defrosting of the outdoor heat exchanger 102 is realized, the four-way valve is not required to be reversed, and the refrigeration mode is switched. Guarantee indoor continuous heating, reinforcing travelling comfort.
In some embodiments of the present invention, the first control valve may be two-position three-way valves, and the two-position three-way valves are the same as the indoor heat exchangers in number and are arranged in a one-to-one correspondence. As shown in fig. 4, fig. 4 is a schematic structural diagram of another embodiment of a multi-split air conditioner according to an embodiment of the present invention, in which the second inner refrigerant port Io2 of the first indoor heat exchanger 103, the first outer refrigerant port Oi1 of the outdoor heat exchanger 102, and the second outer refrigerant port Oi2 of the outdoor heat exchanger 102 are respectively connected to the corresponding first two-position three-way valve 401, and the second inner refrigerant port Io2 of the second indoor heat exchanger 104, the first outer refrigerant port Oi1 of the outdoor heat exchanger 102, and the second outer refrigerant port Oi2 of the outdoor heat exchanger 102 are respectively connected to the first two-position three-way valve 401. In some embodiments of the present invention, the two-position three-way valve includes a first operating position and a second operating position, when the two-position three-way valve is in the first operating position, the second inner refrigerant port Io2 of the indoor heat exchanger corresponding to the two-position three-way valve is communicated with the first outer refrigerant port Oi1 of the outdoor heat exchanger 102, and the second inner refrigerant port Io2 of the indoor heat exchanger is disconnected from the second outer refrigerant port Oi2 of the outdoor heat exchanger 102; when the two-position three-way valve is at the second working position, the second inner refrigerant port Io2 of the indoor heat exchanger corresponding to the two-position three-way valve is disconnected from the first outer refrigerant port Oi1 of the outdoor heat exchanger 102, and the second inner refrigerant port Io2 of the indoor heat exchanger is communicated with the second outer refrigerant port Oi2 of the outdoor heat exchanger 102.
Specifically, taking the first two-position three-way valve 401 corresponding to the second refrigerant port Io2 of the first indoor heat exchanger 103 as an example, the first two-position three-way valve 401 includes a first port sw11, a second port sw12 and a third port sw13, and the first two-position three-way valve includes a first operating position and a second operating position. A first port sw11 of the first two-position three-way valve is communicated with a second inner refrigerant port Io2 of the first indoor heat exchanger 103, a second port sw12 of the first two-position three-way valve is communicated with a first outer refrigerant port Oi1 of the outdoor heat exchanger 102, and a third port sw13 of the first two-position three-way valve 401 is communicated with the other end of the outdoor compressor 101. When the first two-position three-way valve 401 is located at the first working position, the first port sw11 is communicated with the second port sw12, that is, the second inner refrigerant port Io2 of the first indoor heat exchanger 103 is communicated with the first outer refrigerant port Oi1 of the outdoor heat exchanger 102; when the first two-position three-way valve 401 is located at the second operating position, the first port sw11 and the third port sw13 are communicated, that is, the second inner refrigerant port Io2 of the first indoor heat exchanger 103 is communicated with the second outer refrigerant port Oi2 of the outdoor heat exchanger 102.
In some embodiments of the present invention, the second control valve may be two-position three-way valves, and the two-position three-way valves are the same as the indoor heat exchangers in number and are arranged in a one-to-one correspondence. As shown in fig. 4, fig. 4 is a schematic structural view of another embodiment of a multi-split air conditioner according to an embodiment of the present invention, in which a first internal refrigerant port Io1 of a first indoor heat exchanger 103, a high-pressure side refrigerant port Hy1 of a compressor 101, and a low-pressure side refrigerant port Dy1 of the compressor 101 are respectively connected to a second two-position three-way valve 402, and a first internal refrigerant port Io1 of a second indoor heat exchanger 104, a high-pressure side refrigerant port Hy1 of the compressor 101, and a low-pressure side refrigerant port Dy1 of the compressor 101 are respectively connected to the second two-position three-way valve 402. In some embodiments of the present invention, the two-position three-way valve includes a first operating position and a second operating position, when the two-position three-way valve is in the first operating position, the first internal refrigerant port Io1 of the indoor heat exchanger is communicated with the high-pressure side refrigerant port Hy1 of the compressor 101, and the first internal refrigerant port Io1 of the indoor heat exchanger is disconnected from the low-pressure side refrigerant port Dy1 of the compressor 101; when the two-position three-way valve is in the second working position, the first inner refrigerant port Io1 of the indoor heat exchanger is disconnected from the high-pressure side refrigerant port Hy1 of the compressor 101, and the first inner refrigerant port Io1 of the indoor heat exchanger is communicated with the low-pressure side refrigerant port Dy1 of the compressor 101.
Specifically, taking the second two-position three-way valve 402 corresponding to the first refrigerant port Io1 of the first indoor heat exchanger 103 as an example, the second two-position three-way valve 402 includes a first port sw21, a second port sw22 and a third port sw23, and the second two-position three-way valve 402 includes a first operating position and a second operating position. A first port sw21 of the second two-position three-way valve 402 is communicated with a first inner refrigerant port Io1 of the first indoor heat exchanger 103, a second port sw22 of the second two-position three-way valve 402 is communicated with a high-pressure side refrigerant of the compressor 101, and a third port sw23 of the second two-position three-way valve 402 is communicated with a low-pressure side refrigerant of the compressor 101. When the second two-position three-way valve 402 is located at the first operating position, the first port sw21 is communicated with the second port sw22, that is, the first inner refrigerant port Io1 of the first indoor heat exchanger 103 is communicated with the high-pressure side refrigerant port Hy1 of the compressor 101; when the second two-position three-way valve 402 is located at the second operating position, the first port sw21 and the third port sw23 are communicated, that is, the first inner refrigerant port Io1 of the first indoor heat exchanger 103 is communicated with the low-pressure side refrigerant port Dy1 of the compressor 101.
In some embodiments of the present invention, the port and the working position of the first two-position three-way valve 401 are similar to those of the second two-position three-way valve 402, and are not described herein again.
When the multi-split air conditioner is operated in a heating and defrosting mode, that is, when the multi-split air conditioner is operated in a heating and defrosting mode, taking the first indoor heat exchanger 103 as an example of being opened and the second indoor heat exchanger 104 as an example of being closed, the first two-position three-way valve 401 corresponding to the second inner refrigerant port Io2 of the first indoor heat exchanger 103 is located at the first working position, the first two-position three-way valve 401 corresponding to the second inner refrigerant port Io2 of the second indoor heat exchanger 104 is located at the second working position, that is, the second inner refrigerant port Io2 of the first indoor heat exchanger 103 is communicated with the first outer refrigerant port Oi1 of the outdoor heat exchanger 102, the second inner refrigerant port Io2 of the first indoor heat exchanger 103 is disconnected from the second outer refrigerant port Oi2 of the outdoor heat exchanger 102, the second inner refrigerant port Io2 of the first indoor heat exchanger 103 is disconnected from the first outer refrigerant port Oi1 of the outdoor heat exchanger 102, and the second inner refrigerant port Io2 of the first indoor heat exchanger 103 is communicated with the second outer refrigerant port Oi2 of the outdoor heat exchanger 102; the second two-position three-way valve 402 corresponding to the first inner refrigerant port Io1 of the first indoor heat exchanger 103 is located at a first working position, and the second two-position three-way valve corresponding to the first inner refrigerant port Io1 of the second indoor heat exchanger 104 is located at a second working position, that is, the first inner refrigerant port Io1 of the first indoor heat exchanger 103 is communicated with the high-pressure side refrigerant port Hy1 of the compressor 101, the first inner refrigerant port Io1 of the first indoor heat exchanger 103 is disconnected from the low-pressure side refrigerant port Dy1 of the compressor 101, the first inner refrigerant port Io1 of the second indoor heat exchanger 104 is disconnected from the high-pressure side refrigerant port Hy1 of the compressor 101, and the first inner refrigerant port Io1 of the second indoor heat exchanger 104 is communicated with the low-pressure side refrigerant port Dy1 of the compressor 101. The first indoor heat exchanger 103 exchanges heat with the refrigerant of the compressor 101, flows into the outdoor heat exchanger 102 to defrost the refrigerant, and then the refrigerant defrosted in the outdoor heat exchanger 102 flows into the second indoor heat exchanger 104 to evaporate the refrigerant, and then flows through the low-pressure side refrigerant port Dy1 of the compressor 101 to return to the compressor 101.
When the multi-split air conditioner operates in a heating mode: to illustrate by taking the first indoor heat exchanger 103 as an example and the second indoor heat exchanger 104 as an example, the first two-position three-way valve 401 corresponding to the second inner refrigerant port Io2 of the first indoor heat exchanger 103 is located at the second working position, the first two-position three-way valve 401 corresponding to the second inner refrigerant port Io2 of the second indoor heat exchanger 104 is located at the second working position, that is, the second inner refrigerant port Io2 of the first indoor heat exchanger 103 and the second inner refrigerant port Io2 of the second indoor heat exchanger 104 are respectively communicated with the second outer refrigerant port Oi2 of the outdoor heat exchanger 102, and the second inner refrigerant port Io2 of the first indoor heat exchanger 103 and the second inner refrigerant port Io2 of the second indoor heat exchanger 104 are respectively disconnected from the first outer refrigerant port Oi1 of the outdoor heat exchanger 102; the second two-position three-way valve 402 corresponding to the first inner refrigerant port Io1 of the first indoor heat exchanger 103 is located at a first working position, and the second two-position three-way valve 402 corresponding to the second inner refrigerant port Io2 of the second indoor heat exchanger 104 is located at a first working position, that is, the first inner refrigerant port Io1 of the first indoor heat exchanger 103 and the first inner refrigerant port Io1 of the second indoor heat exchanger 104 are respectively communicated with the high-pressure side refrigerant port Hy1 of the compressor 101, and the first inner refrigerant port Io1 of the first indoor heat exchanger 103 and the first inner refrigerant port Io1 of the second indoor heat exchanger 104 are respectively disconnected from the low-pressure side refrigerant port Dy1 of the compressor 101; the outdoor heat exchange valve 106 corresponding to the first external refrigerant port Oi1 of the outdoor heat exchanger 102 is opened, that is, the first external refrigerant port Oi1 of the outdoor heat exchanger 102 is communicated with the low-pressure side refrigerant port Dy1 of the compressor 101.
It should be noted that in the embodiment of the present invention, any one of the first control valve and the second control valve may be a two-position three-way valve, and the remaining one includes two control valves, for example, the first control valve is a two-position three-way valve, and the second control valve includes a second high pressure/low pressure side control valve SV3 and a second low pressure/high pressure side control valve SV 4; the first control valve comprises a first heat exchange valve SV2 and a first throttle valve SV1, and the second control valve is a two-position three-way valve.
In some embodiments of the present invention, to better describe the multi-split air conditioner provided in the embodiments of the present invention, a method for controlling the multi-split air conditioner is provided on the basis of the multi-split air conditioner, as shown in fig. 5, where fig. 5 is a schematic flow diagram of an embodiment of the method for controlling the multi-split air conditioner provided in the embodiments of the present invention, and the method for controlling the multi-split air conditioner includes steps 501 to 503:
step 501, if the multi-split air conditioner starts a defrosting mode, determining a first target indoor heat exchanger in a plurality of indoor heat exchangers according to states of the plurality of indoor heat exchangers in the multi-split air conditioner.
The state comprises opening and closing, and the first target indoor heat exchanger is an indoor heat exchanger of which the state is opening.
In some embodiments of the present invention, whether the defrosting mode of the multi-split air conditioner is activated may be determined by at least one of a surface temperature of the outdoor heat exchanger, an outdoor ambient temperature, and a received defrosting command. For example, if a defrosting instruction is received, controlling the multi-online air conditioner to start a defrosting mode; if the defrosting instruction is not received, acquiring the surface temperature and the outdoor environment temperature of the outdoor heat exchanger, and comparing the surface temperature and the outdoor environment temperature of the outdoor heat exchanger with a first preset temperature threshold and a second preset temperature threshold respectively; and if the surface temperature of the outdoor heat exchanger is less than or equal to a first preset temperature threshold and/or the outdoor environment temperature is less than or equal to a second preset temperature threshold, controlling the multi-split air conditioner to start a defrosting mode.
Step 502, controlling a first control valve corresponding to the first target indoor heat exchanger, disconnecting a second inner refrigerant port of the first target indoor heat exchanger from a second outer refrigerant port of the outdoor heat exchanger, and communicating the second inner refrigerant port of the first target indoor heat exchanger with the first outer refrigerant port of the outdoor heat exchanger.
The first control valve is used for communicating or disconnecting a second inner refrigerant port of the first target indoor heat exchanger with an outdoor heat exchanger in the multi-split air conditioner.
Step 503, the refrigerant flowing out of the high-pressure side refrigerant port of the compressor flows into the first target indoor heat exchanger for heat exchange, and the refrigerant after heat exchange flows into the outdoor heat exchanger for defrosting.
In some embodiments of the present invention, after step 503, it may be determined whether to exit the defrost mode according to at least one of a length of time the heating defrost mode is operated and a new surface temperature of the outdoor heat exchanger, and specifically, the steps a 1-a 2:
and a1, acquiring the new surface temperature of the outdoor heat exchanger, and determining whether to exit the defrosting mode according to the new surface temperature and/or the time length for operating the heating defrosting mode.
In step a2, if the defrosting mode is exited, the second inner refrigerant port of the first target indoor heat exchanger is disconnected from the first outer refrigerant port of the outdoor heat exchanger, and the second inner refrigerant port of the first target indoor heat exchanger is communicated with the second outer refrigerant port of the outdoor heat exchanger.
When the multi-split air conditioner heats and defrosts, the high-temperature and high-pressure refrigerant extruded by the compressor directly enters the outdoor heat exchanger for defrosting without throttling after exchanging heat by the indoor heat exchanger, and the defrosted refrigerant returns to the compressor after entering the indoor heat exchanger without starting heating for evaporation, so that a complete refrigeration cycle is formed, defrosting of the outdoor heat exchanger is realized, reversing of the four-way valve is not needed, and the refrigeration mode is switched. Guarantee indoor continuous heating, reinforcing travelling comfort.
In some embodiments of the present invention, a second target indoor heat exchanger in an off state may be selected as an evaporator in the indoor heat exchanger according to a state of the indoor heat exchanger, and a refrigerant in the outdoor heat exchange enters the second target indoor heat exchanger to be evaporated and then returns to the compressor through a low-pressure side refrigerant port of the compressor, specifically, as shown in fig. 6, fig. 6 is a flow diagram of an embodiment of defrosting in the control method of the multi-split air conditioner provided in the embodiment of the present invention, where the illustrated defrosting method includes steps 601 to 603:
step 601, acquiring a second target indoor heat exchanger in the indoor heat exchangers according to the states of the indoor heat exchangers.
Wherein the second target indoor heat exchanger is an indoor heat exchanger whose state is off.
Step 602, communicating a second inner refrigerant port of the second target indoor heat exchanger with a second outer refrigerant port of the outdoor heat exchanger, and disconnecting the second inner refrigerant port of the second target indoor heat exchanger from the first outer refrigerant port of the outdoor heat exchanger.
So that the refrigerant in the outdoor heat exchanger enters the second target indoor heat exchanger to be evaporated.
In some embodiments of the present invention, the second inner refrigerant port Io2 of the second target indoor heat exchanger may be controlled to communicate with the second outer refrigerant port Oi2 of the outdoor heat exchanger 102 and the second inner refrigerant port Io2 of the second target indoor heat exchanger may be controlled to disconnect or open the first throttle SV 8932 and the first heat exchange valve SV2 shown in fig. 1 to 3, or the operating position of the second two-position three-way valve 402 shown in fig. 4 may be adjusted to disconnect or open the first throttle SV1 and the second inner refrigerant port Io2 of the second target indoor heat exchanger from the first outer refrigerant port Oi1 of the outdoor heat exchanger 102.
Step 603, disconnecting the first inner refrigerant port of the second target indoor heat exchanger from the high-pressure side refrigerant port of the compressor, and communicating the first inner refrigerant port of the second target indoor heat exchanger with the low-pressure side refrigerant port of the compressor.
So that the refrigerant evaporated in the second target indoor heat exchanger returns to the compressor through the low-pressure side refrigerant port.
In some embodiments of the present invention, the first inner refrigerant port Io1 of the second target indoor heat exchanger may be disconnected from the high-pressure side refrigerant port Hy1 of the compressor 101 and the first inner refrigerant port Io1 of the second target indoor heat exchanger may be communicated with the low-pressure side refrigerant port Dy1 of the compressor 101 by controlling the disconnection or opening of the second high-pressure/low-pressure side control valve SV3 and the second low-pressure/high-pressure side control valve SV4 shown in fig. 1 to 3 or adjusting the operating position of the second two-position three-way valve 402 shown in fig. 4.
In some embodiments of the present invention, when the multi-split air conditioner operates in the heating and defrosting mode, the opening degree of the first throttle SV1 corresponding to the second target indoor heat exchanger may be adjusted by the duration of operating the heating and defrosting mode and/or the surface temperature of the outdoor heat exchanger, for example, if the duration of operating the heating and defrosting mode does not reach the preset duration, the temperature change value of the surface temperature of the outdoor heat exchanger 102 in the preset time period is calculated; adjusting the opening degree of the first throttle valve SV1 to a first preset opening degree if the temperature change value is less than or equal to a first preset temperature change threshold value; if the temperature change value is greater than a first preset temperature change threshold value and the temperature change value is less than or equal to a second preset temperature change value, adjusting the opening degree of the first throttle valve SV1 to a second preset opening degree; if the temperature change value is greater than a second preset temperature change threshold, adjusting the opening degree of the first throttle valve SV1 to a third preset opening degree; if the period of time for which the heating defrost mode is operated reaches the preset period of time, the opening degree of the first throttle valve SV1 is adjusted to the third preset opening degree. The first preset opening degree, the second preset opening degree and the second preset opening degree meet the conditions that the first preset opening degree is smaller than the first preset opening degree and smaller than the first preset opening degree, and the first preset temperature change threshold value, the second preset temperature change threshold value and the third preset temperature change threshold value meet the conditions that the first preset temperature change threshold value is smaller than the second preset temperature change threshold value and smaller than the third preset temperature change threshold value.
It will be understood by those skilled in the art that all or part of the steps of the methods of the above embodiments may be performed by instructions or by associated hardware controlled by the instructions, which may be stored in a computer readable storage medium and loaded and executed by a processor.
To this end, embodiments of the present invention provide a storage medium, in which a plurality of instructions are stored, and the instructions can be loaded by a processor to perform steps of any of the methods for controlling a multi-split air conditioner provided by the embodiments of the present invention. For example, the instructions may perform the steps of:
if the multi-split air conditioner starts a defrosting mode, determining a first target indoor heat exchanger in the plurality of indoor heat exchangers according to the states of the plurality of indoor heat exchangers in the multi-split air conditioner, wherein the states comprise opening and closing, and the first target indoor heat exchanger is an indoor heat exchanger which is opened in the state;
controlling a first control valve corresponding to the first target indoor heat exchanger, disconnecting a second inner refrigerant port of the first target indoor heat exchanger from a second outer refrigerant port of the outdoor heat exchanger, and communicating the second inner refrigerant port of the first target indoor heat exchanger with a first outer refrigerant port of the outdoor heat exchanger, wherein the first control valve is used for communicating or disconnecting the second inner refrigerant port of the first target indoor heat exchanger with the outdoor heat exchanger in the multi-split air conditioner;
and (3) enabling the refrigerant flowing out of the refrigerant port on the high-pressure side of the compressor to flow into the first target indoor heat exchanger for heat exchange, and enabling the refrigerant after heat exchange to flow into the outdoor heat exchanger for defrosting.
The above operations can be implemented in the foregoing embodiments, and are not described in detail herein.
Wherein the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
Since the instructions stored in the storage medium may execute the steps in any of the control methods for the multi-split air conditioners provided in the embodiments of the present invention, the beneficial effects that can be achieved by any of the control methods for the multi-split air conditioners provided in the embodiments of the present invention can be achieved, which are detailed in the foregoing embodiments and will not be described herein again.
The multi-split air conditioner, the control method and the storage medium provided by the embodiments of the present invention are described in detail above, and the principle and the implementation of the present invention are explained in the present document by applying specific examples, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (11)

1. A multi-split air conditioner comprises a compressor, an outdoor heat exchanger and a plurality of indoor heat exchangers,
all the indoor heat exchangers are connected in parallel;
each indoor heat exchanger comprises a first inner refrigerant port and a second inner refrigerant port, and the outdoor heat exchanger comprises a first outer refrigerant port and a second outer refrigerant port;
the first inner refrigerant port of each indoor heat exchanger is communicated with the compressor, the second inner refrigerant port of each indoor heat exchanger is provided with a first control valve, the second inner refrigerant port of each indoor heat exchanger is communicated with the first outer refrigerant port or the second outer refrigerant port of the outdoor heat exchanger through the first control valve, when the multi-split air conditioner heats and defrosts, at least one indoor heat exchanger is communicated with the first outer refrigerant port of the outdoor heat exchanger through the first control valve, refrigerant of the compressor flows into the outdoor heat exchanger for defrosting after heat exchange, and after defrosting, the refrigerant in the outdoor heat exchanger flows through the second outer refrigerant port and then enters the rest indoor heat exchangers through the first control valves corresponding to the rest indoor heat exchangers.
2. The multi-split air conditioner as claimed in claim 1,
when the multi-split air conditioner heats and defrosts, the second inner refrigerant port of at least one indoor heat exchanger is communicated with the first outer refrigerant port of the outdoor heat exchanger through the corresponding first control valve, and the second inner refrigerant ports of the rest indoor heat exchangers are connected with the second outer refrigerant port of the outdoor heat exchanger through the corresponding first control valve.
3. The multi-split air conditioner as claimed in claim 2,
a second control valve is arranged at a first inner refrigerant port of each indoor heat exchanger;
when the multi-split air conditioner heats and defrosts, the first inner refrigerant port of at least one indoor heat exchanger is communicated with the high-pressure side refrigerant port of the compressor through the corresponding second control valve, and the first inner refrigerant ports of the rest indoor heat exchangers are communicated with the low-pressure side refrigerant port of the compressor through the corresponding second control valve.
4. A multi-split air conditioner as set forth in any one of claims 1 to 3, wherein said first control valve comprises a first heat exchanging valve and a first throttle valve;
a second inner refrigerant port of the indoor heat exchanger is connected with a first outer refrigerant port of the outdoor heat exchanger through the first heat exchange valve, and a second inner refrigerant port of the indoor heat exchanger is connected with a second outer refrigerant port of the outdoor heat exchanger through the first throttling valve;
when the multi-split air conditioner heats and defrosts, the second inner refrigerant port of at least one indoor heat exchanger is communicated with the first outer refrigerant port of the outdoor heat exchanger through the corresponding first heat exchange valve, and the second inner refrigerant ports of the rest indoor heat exchangers are communicated with the second outer refrigerant port of the outdoor heat exchanger through the corresponding first throttle valve.
5. A multi-split air conditioner as claimed in any one of claims 1 to 3, wherein the first control valve is a two-position three-way valve including a first operating position and a second operating position;
when the two-position three-way valve is at the first working position, a second inner refrigerant port of the indoor heat exchanger is communicated with a first outer refrigerant port of the outdoor heat exchanger, and the second inner refrigerant port of the indoor heat exchanger is disconnected with a second outer refrigerant port of the outdoor heat exchanger;
when the two-position three-way valve is at the second working position, the second inner refrigerant port of the indoor heat exchanger is disconnected with the first outer refrigerant port of the outdoor heat exchanger, and the second inner refrigerant port of the indoor heat exchanger is communicated with the second outer refrigerant port of the outdoor heat exchanger.
6. A multi-split air conditioner as set forth in any one of claims 1 to 3, wherein said second control valve comprises a second high pressure/low pressure side control valve and a second low pressure/high pressure side control valve;
a first inner refrigerant port of the indoor heat exchanger is connected with a high-pressure side refrigerant port of the compressor through the second high-pressure/low-pressure side control valve, and the first inner refrigerant port of the indoor heat exchanger is connected with a low-pressure side refrigerant port of the compressor through the second low-pressure/high-pressure side control valve;
when the multi-split air conditioner heats and defrosts, the first inner refrigerant port of at least one indoor heat exchanger is communicated with the high-pressure side refrigerant port of the compressor through the corresponding second high-pressure/low-pressure side control valve, and the first inner refrigerant ports of the rest indoor heat exchangers are communicated with the low-pressure side refrigerant port of the compressor through the corresponding second low-pressure/high-pressure side control valves.
7. A multi-split air conditioner as claimed in any one of claims 1 to 3, wherein the second control valve is a two-position three-way valve including a first operating position and a second operating position;
when the two-position three-way valve is at the first working position, a first inner refrigerant port of the indoor heat exchanger is communicated with a high-pressure side refrigerant port of the compressor, and the first inner refrigerant port of the indoor heat exchanger is disconnected with a low-pressure side refrigerant port of the compressor;
when the two-position three-way valve is at the second working position, a first inner refrigerant port of the indoor heat exchanger is disconnected with a high-pressure side refrigerant port of the compressor, and the first inner refrigerant port of the indoor heat exchanger is communicated with a low-pressure side refrigerant port of the compressor.
8. A multi-split air conditioner control method applied to the multi-split air conditioner as set forth in any one of claims 1 to 7, comprising:
if the multi-split air conditioner starts a defrosting mode, determining a first target indoor heat exchanger in a plurality of indoor heat exchangers according to states of the plurality of indoor heat exchangers in the multi-split air conditioner, wherein the states comprise opening and closing, and the first target indoor heat exchanger is an indoor heat exchanger which is opened in the state;
controlling a first control valve corresponding to the first target indoor heat exchanger, disconnecting a second inner refrigerant port of the first target indoor heat exchanger from a second outer refrigerant port of an outdoor heat exchanger, and communicating the second inner refrigerant port of the first target indoor heat exchanger with a first outer refrigerant port of the outdoor heat exchanger, wherein the first control valve is used for communicating or disconnecting the second inner refrigerant port of the first target indoor heat exchanger with the outdoor heat exchanger in the multi-split air conditioner;
and (3) enabling the refrigerant flowing out of the refrigerant port on the high-pressure side of the compressor to flow into the first target indoor heat exchanger for heat exchange, and enabling the refrigerant after heat exchange to flow into the outdoor heat exchanger for defrosting.
9. The multi-split air conditioner control method as set forth in claim 8, further comprising:
acquiring a second target indoor heat exchanger in the indoor heat exchangers according to the state of each indoor heat exchanger, wherein the second target indoor heat exchanger is an indoor heat exchanger which is closed in the state;
communicating a second inner refrigerant port of the second target indoor heat exchanger with a second outer refrigerant port of the outdoor heat exchanger, and disconnecting the second inner refrigerant port of the second target indoor heat exchanger from the first outer refrigerant port of the outdoor heat exchanger, so that the refrigerant in the outdoor heat exchanger enters the second target indoor heat exchanger to be evaporated;
disconnecting a first inner refrigerant port of the second target indoor heat exchanger from a high-pressure side refrigerant port of the compressor, and communicating the first inner refrigerant port of the second target indoor heat exchanger with a low-pressure side refrigerant port of the compressor, so that the refrigerant evaporated in the second target indoor heat exchanger returns to the compressor through the low-pressure side refrigerant port.
10. The method for controlling a multi-split air conditioner according to claim 8 or 9, wherein after the refrigerant flowing out of a high pressure side refrigerant port of the compressor flows into the first target indoor heat exchanger for heat exchange and the refrigerant after heat exchange flows into the outdoor heat exchanger for defrosting, the method comprises:
acquiring a new surface temperature of the outdoor heat exchanger, and determining whether to exit the defrosting mode or not according to the new surface temperature and/or the time length for operating the defrosting mode;
and if the defrosting mode is exited, disconnecting the second inner refrigerant port of the first target indoor heat exchanger from the first outer refrigerant port of the outdoor heat exchanger, and communicating the second inner refrigerant port of the first target indoor heat exchanger with the second outer refrigerant port of the outdoor heat exchanger.
11. A storage medium storing a plurality of instructions adapted to be loaded by a processor to perform the steps of the multi-split air conditioner control method according to any one of claims 8 to 10.
CN202210067731.2A 2022-01-20 2022-01-20 Multi-split air conditioner, control method and storage medium Pending CN114353172A (en)

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CN115371153A (en) * 2022-08-22 2022-11-22 珠海格力电器股份有限公司 Air conditioner and control method

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CN109269017A (en) * 2018-09-03 2019-01-25 南京天加环境科技有限公司 A kind of multi-connected machine single module system for not shutting down defrosting
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CN103383157A (en) * 2013-06-28 2013-11-06 广东美的电器股份有限公司 Heat pump air-conditioning system and control method thereof
CN106885405A (en) * 2017-04-24 2017-06-23 深圳创维空调科技有限公司 A kind of air-conditioner system and its Defrost method
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Application publication date: 20220415