CN114857662B - Multi-split air conditioning system and control method thereof - Google Patents

Multi-split air conditioning system and control method thereof Download PDF

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Publication number
CN114857662B
CN114857662B CN202210491978.7A CN202210491978A CN114857662B CN 114857662 B CN114857662 B CN 114857662B CN 202210491978 A CN202210491978 A CN 202210491978A CN 114857662 B CN114857662 B CN 114857662B
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China
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indoor unit
conditioning system
indoor
air conditioning
outdoor
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CN114857662A (en
Inventor
左计学
李丛来
孙健宗
王西涛
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Priority to CN202210491978.7A priority Critical patent/CN114857662B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • 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
    • F24F11/43—Defrosting; Preventing freezing of indoor 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
    • F24F11/65—Electronic processing for selecting an operating mode
    • F24F11/67—Switching between heating and cooling modes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
    • 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
    • F25B41/40—Fluid line arrangements
    • F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The application discloses a multi-split air conditioning system and a control method thereof, which relate to the technical field of household appliances and can remove condensed water on the surface of an indoor heat exchanger when the multi-split air conditioning system operates. The multi-split air conditioning system comprises: the outdoor unit comprises an outdoor heat exchanger, a compressor, a four-way valve, a bypass stop valve, an outdoor electromagnetic valve and an outdoor throttling device; the indoor unit comprises a plurality of indoor units connected in parallel, and each indoor unit comprises an indoor heat exchanger, an indoor expansion valve, a bypass branch electromagnetic valve and a circulation branch electromagnetic valve; the compressor, the four-way valve, the outdoor heat exchanger and the indoor expansion valve, the indoor heat exchanger and the circulation branch electromagnetic valve in each indoor unit are connected through pipelines to form a refrigerant circulation loop; the exhaust port of the compressor in the outdoor unit, the outdoor throttling device, the outdoor electromagnetic valve, the bypass stop valve, the bypass branch electromagnetic valve in each indoor unit and the indoor heat exchanger are connected through pipelines to form a refrigerant bypass branch.

Description

Multi-split air conditioning system and control method thereof
Technical Field
The application relates to the technical field of household appliances, in particular to a multi-split air conditioning system and a control method thereof.
Background
With the development of economy and society, air conditioners are increasingly used in various places such as entertainment, home, work and the like. When air conditioners are needed to be used in a plurality of small areas in the same area, a multi-split air conditioning system is often adopted to realize the regulation and control of the room temperature of the multiple areas in consideration of the saving of electric energy. However, in the use process of the multi-split air conditioning system, condensed water is easy to generate on the surface of an indoor heat exchanger of the multi-split air conditioning system during refrigeration, so that bacteria are bred on the surface of the indoor heat exchanger, and peculiar smell is generated.
In order to solve the problem of accumulation of condensed water, a condensate tray is arranged at the tail end equipment of a multi-split air conditioning system in the related art, and when the condensed water in the condensate tray reaches a certain amount, a gravity valve arranged at the bottom of the condensate tray is opened to drain water to a chassis; like this, although can play certain get rid of the condensate water function, because the condensate water tray just drains after ponding reaches a certain amount, consequently still can remain moisture, and then breeds the bacterium, can't thoroughly get rid of the condensate water.
Disclosure of Invention
The embodiment of the application provides a multi-split air conditioning system and a control method thereof, which are used for removing condensed water on the surface of an indoor heat exchanger when the multi-split air conditioning system is in operation and improving the cleanliness of the multi-split air conditioning system.
In a first aspect, an embodiment of the present application provides a multi-split air conditioning system, including: the outdoor unit comprises an outdoor heat exchanger, a compressor, a four-way valve, a bypass stop valve, an outdoor electromagnetic valve and an outdoor throttling device; the indoor unit comprises a plurality of indoor units connected in parallel, and each indoor unit comprises an indoor heat exchanger, an indoor expansion valve, a bypass branch electromagnetic valve and a circulation branch electromagnetic valve; the compressor, the four-way valve, the outdoor heat exchanger and the indoor expansion valve, the indoor heat exchanger and the circulation branch electromagnetic valve in each indoor unit are sequentially connected through pipelines to form a refrigerant circulation loop; the exhaust port of the compressor in the outdoor unit, the outdoor throttling device, the outdoor electromagnetic valve, the bypass stop valve, the bypass branch electromagnetic valve in each indoor unit and the indoor heat exchanger are sequentially connected through pipelines to form a refrigerant bypass branch.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects: in the multi-split air conditioning system, the indoor unit is provided with the refrigerant circulation loop and the refrigerant bypass branch, and the refrigerant circulation loop and the refrigerant bypass branch are communicated and cut off, so that the indoor unit can have different refrigerant circulation flow directions, namely, the indoor unit can be flexibly switched between the evaporator and the condenser. Therefore, in the refrigeration mode, if the indoor unit has the problem of condensation water, the indoor unit can be switched from the evaporator to the condenser, so that the condensation water attached to the surface of the indoor heat exchanger of the indoor unit is evaporated, and the cleanliness of the multi-split air conditioning system is ensured.
In some embodiments, the multi-split air conditioning system is in a cooling and drying mode or a heating and defrosting mode: for the outdoor unit, an outdoor electromagnetic valve is opened, and the outdoor heat exchanger works as a condenser; for the first type indoor unit in the indoor unit, the bypass branch electromagnetic valve is opened, the circulation branch electromagnetic valve is closed, and the indoor heat exchanger works as a condenser; for the second type indoor unit in the indoor unit, the bypass branch electromagnetic valve is closed, the circulation branch electromagnetic valve is opened, and the indoor heat exchanger works as an evaporator.
Therefore, in the refrigeration and drying mode, the first type indoor unit is used as a condenser for heating, so that condensed water on the surface of the heat exchanger of the first type indoor unit is evaporated, and the cleanliness of the multi-split air conditioning system is improved. And when the first type indoor unit removes condensed water, the second type indoor unit works as an evaporator, so that normal refrigeration is realized, and the refrigeration experience of a user is not influenced. In the heating defrosting mode, the outdoor unit works as a condenser, so that frost on the surface of the outdoor heat exchanger is removed, and the heating effect is improved. The first type indoor unit is used as a condenser for normal heating so as to ensure heating experience of a user, the second type indoor unit is used as an evaporator, a refrigerant loop is formed between the second type indoor unit and the first type indoor unit, and a refrigerant loop is formed between the second type indoor unit and the outdoor unit so as to ensure normal defrosting.
In some embodiments, the multi-split air conditioning system further includes a controller; the controller is configured to: acquiring the running state of each indoor unit under the condition that the multi-split air conditioning system is in a refrigerating mode; if part of the indoor units are in the shutdown state, judging whether the indoor units in the shutdown state exist or not, wherein the indoor units meet the starting condition of the drying function; if the indoor unit is in the shutdown state and meets the starting condition of the drying function, the indoor unit in the refrigeration state is used as a first type indoor unit, and the indoor unit in the refrigeration state is used as a second type indoor unit, so that the multi-split air conditioning system is controlled to operate in a refrigeration drying mode.
It should be understood that the indoor unit in the shutdown state has reached the preset cooling temperature, that is, the cooling process is completed, and there is a high possibility that the condensation water adheres to the surface of the indoor heat exchanger, so it is further determined whether there is an indoor unit satisfying the starting condition of the drying function in the indoor unit in the shutdown state, and the indoor unit in the shutdown state and satisfying the starting condition of the drying function is used as the first type indoor unit, that is, as the condenser, to evaporate the condensation water on the surface of the indoor heat exchanger of the indoor unit, thereby realizing the drying function. The room controlled by the indoor unit in the refrigerating state still does not reach the preset temperature, so the indoor unit in the refrigerating state is used as the second type indoor unit to work, the indoor unit in the refrigerating state normally refrigerates, and the refrigerating experience of a user is not affected.
In some embodiments, the drying function starting conditions of the multi-split air conditioning system include: the temperature of the refrigerant liquid pipe of the indoor unit is smaller than the difference between the dew point temperature of the environment where the indoor unit is positioned and the first temperature compensation value within the first preset time.
It should be understood that if the temperature of the refrigerant liquid pipe of the indoor unit is less than the ambient dew point temperature, condensation water will be generated on the indoor heat exchanger surface of the indoor unit. In order to further improve the accuracy of condensation water judgment, a first temperature compensation value is added for correction, and if the temperature of a refrigerant liquid pipe of the indoor unit is smaller than the difference between the ambient dew point temperature and the first temperature compensation value, the heat exchanger of the indoor unit is more moist, and condensation water is generated. Considering that a detection error exists in single measurement, if the measurement is continuously performed within a first preset time period, if the indoor unit constantly meets the condition that the temperature of the refrigerant liquid pipe is smaller than the difference between the ambient dew point temperature and the first temperature compensation value within the first preset time period, the heat exchanger of the indoor unit is considered to be more moist, the starting condition of a drying function is met, and further the indoor unit is dried.
In some embodiments, each indoor unit of the multi-split air conditioning system further includes: an indoor fan; a controller, further configured to: when the multi-split air conditioning system is in a refrigeration drying mode, controlling an indoor fan of a first type indoor unit to operate according to a first air quantity; after the air volume adjusting condition is met, controlling the indoor fan of the first type indoor unit to operate according to a second air volume, wherein the second air volume is larger than the first air volume, and the air volume adjusting condition comprises the following steps: the temperature of the refrigerant liquid pipe of the first type indoor unit is larger than the sum of the dew point temperature of the environment where the first type indoor unit is positioned and a second temperature compensation value within a second preset time period; and after the third preset time period passes, controlling the indoor fans of the first type indoor units to stop running.
It should be appreciated that when the multi-split air conditioning system is in the cool and dry mode, the first type of indoor unit operates as a condenser in the heating mode. At this time, the air near the heat exchanger of the first type indoor unit is heated by the lower first air quantity, and then kept near the indoor heat exchanger, so that heat is accumulated, and condensation water on the surface of the heat exchanger of the first type indoor unit is evaporated more quickly. Further, if the temperature of the refrigerant liquid pipe of the first type indoor unit is detected to be larger than the sum of the dew point temperature of the environment where the first type indoor unit is located and the second temperature compensation value within the second preset time period, the indoor heat exchanger of the indoor unit indicates that the surface is drier, and the condensed water is evaporated. Therefore, after the air quantity adjusting condition is met, the operation of the indoor fan is controlled by the larger second air quantity, so that the evaporated condensed water vapor is discharged out of the indoor unit.
In some embodiments, the controller of the multi-split air conditioning system is further configured to: setting the opening degree of an indoor expansion valve of the first type indoor unit as an initial opening degree; and adjusting the opening degree of the indoor expansion valve of the first-type indoor unit according to the temperature of the refrigerant liquid pipe of the first-type indoor unit so that the temperature of the refrigerant liquid pipe of the first-type indoor unit is greater than or equal to the dew point temperature of the environment where the first-type indoor unit is positioned.
It should be understood that, by adjusting the opening of the indoor expansion valve according to the temperature of the refrigerant liquid pipe of the first type indoor unit, the temperature of the refrigerant liquid pipe of the first type indoor unit tends to be higher than the ambient dew point temperature of the indoor unit along with the adjustment of the electronic expansion valve, so that the condensed water of the indoor unit is evaporated by the high temperature of the heat exchanger of the indoor unit.
In some embodiments, the controller of the multi-split air conditioning system is configured to adjust the opening of the indoor expansion valve according to the temperature of the refrigerant liquid pipe of the first type of indoor unit, and specifically performs the following steps: determining a first opening change value according to the opening of the indoor expansion valve of the first type indoor unit of the n-1 th adjustment period; determining a second opening degree change value according to the refrigerant liquid pipe temperature of the first-type indoor unit in the nth adjusting period, the dew point temperature of the environment of the first-type indoor unit in the nth adjusting period, the refrigerant liquid pipe temperature of the first-type indoor unit in the (n-1) th adjusting period and the dew point temperature of the environment of the first-type indoor unit in the (n-1) th adjusting period; and determining the opening degree of the indoor expansion valve of the first type indoor unit of the nth adjusting period according to the first opening degree change value, the second opening degree change value and the opening degree of the indoor expansion valve of the first type indoor unit of the nth adjusting period.
In some embodiments, the controller of the multi-split air conditioning system is further configured to: judging whether the first type indoor unit meets the exit condition of the drying function; and when the first type indoor unit meets the exit condition of the drying function, controlling a bypass branch electromagnetic valve in the first type indoor unit to be closed.
Based on the above, the first type indoor unit is enabled to close the bypass branch electromagnetic valve in time after the exit condition of the drying function is met, so that the refrigerant which is fed to the indoor unit through the bypass branch is transferred to other indoor units, and the refrigerating effect is improved.
In some embodiments, the drying function exit condition described above includes: the temperature of the refrigerant liquid pipe of the indoor unit is larger than or equal to the sum of the dew point temperature of the environment where the indoor unit is positioned and a third temperature compensation value within a third preset time period.
It should be understood that if the temperature of the refrigerant liquid pipe of the indoor unit is greater than or equal to the sum of the dew point temperature of the environment where the indoor unit is located and the third temperature compensation value, the surface of the heat exchanger of the indoor unit is drier, so that the bypass branch electromagnetic valve of the indoor unit is closed to terminate the refrigerant flow of the bypass branch of the indoor unit. The single measurement error is considered, so that the temperature of the refrigerant fluid tube can be continuously detected for multiple times within the third preset time length, and the detection reliability is improved.
In some embodiments, the multi-split air conditioning system further includes a controller; a controller configured to: judging whether the outdoor unit meets the starting condition of the defrosting function or not under the condition that the multi-split air conditioning system is in a heating mode; when the outdoor unit meets the defrosting starting condition, judging whether the ratio between the total capacity of the indoor unit in a heating state and the capacity of the outdoor unit is smaller than or equal to a preset ratio; if yes, the indoor unit in the heating state is used as a first type indoor unit, the indoor unit in the stopping state is used as a second type indoor unit, and the multi-split air conditioning system is controlled to operate in a heating defrosting mode.
It should be understood that if the outdoor unit satisfies the defrosting function start condition, the multi-split air conditioning system may be converted into a heating defrosting mode to complete defrosting. The indoor unit in the stop state is used as a second type indoor unit, namely, an evaporator, so as to be matched with the refrigerant circulation when the outdoor unit is used as a condenser. And taking the indoor unit in a heating state as a first type indoor unit, namely, taking the indoor unit as a condenser to run for continuous heating so as to ensure the heating experience of a user.
In some embodiments, the defrosting function starting condition includes that the refrigerant tube temperature of the outdoor unit is less than or equal to a difference between the outdoor ambient temperature and a fourth temperature compensation value within a fourth preset time period.
It should be understood that when the temperature of the liquid pipe of the outdoor unit is less than or equal to the difference between the outdoor ambient temperature and the fourth temperature compensation value, the surface of the heat exchanger of the outdoor unit is frosted, and the error of single detection temperature is considered, so that whether the temperature of the liquid pipe of the refrigerant of the outdoor unit is always less than or equal to the difference between the outdoor ambient temperature and the fourth temperature compensation value is judged within the fourth preset time period, so that the detection accuracy is improved.
In some embodiments, the controller of the multi-split air conditioning system is further configured to: after the multi-split air conditioning system starts to operate in a heating defrosting mode, judging whether the outdoor unit meets a defrosting function exit condition or not; if the outdoor unit meets the defrosting function exit condition, controlling the multi-split air conditioning system to operate in a heating mode; if the outdoor unit does not meet the defrosting function exit condition, controlling the multi-split air conditioning system to operate in a heating mode when the duration of operating in heating and defrosting of the multi-split air conditioning system reaches a fifth preset duration.
It should be understood that the outdoor heat exchanger of the outdoor unit has completed defrosting when the outdoor unit satisfies the defrosting function exit condition. Therefore, the multi-split air conditioner system is converted into a heating mode, and the indoor temperature is further improved. In addition, if the outdoor unit does not meet the exiting condition of the defrosting function, but the operation heating defrosting mode reaches a fifth preset duration, the indoor unit in the shutdown state in the air conditioning system is refrigerated for a long time, the outdoor unit finishes partial defrosting, and in order to ensure the comfort of indoor temperature, the whole multi-split air conditioning system is converted into the heating mode so as to stop the indoor unit refrigeration in the defrosting mode, and further improve the indoor temperature.
In some embodiments, the defrosting function exit condition includes that the refrigerant liquid pipe temperature of the outdoor unit is greater than a sum of the outdoor ambient temperature and a fifth temperature compensation value within a sixth preset duration.
It should be understood that if the temperature of the refrigerant liquid pipe of the outdoor unit is greater than the sum of the outdoor ambient temperature and the fifth temperature compensation value within the sixth preset time period, the surface temperature of the heat exchanger of the outdoor unit is higher, and defrosting is completed, so that the multi-split air conditioning system is controlled to operate in a heating mode so that the air conditioning system can heat normally. The single measurement error is considered, so that the refrigerant liquid pipe temperature of the outdoor unit can be continuously detected for multiple times within the sixth preset time length, and the detection reliability is improved.
In some embodiments, the multi-split air conditioning system further includes a controller; a controller configured to: under the condition that the multi-split air conditioning system is in a refrigerating mode or a heating mode, judging whether the liquid storage function starting condition is met or not, wherein the liquid storage function starting condition comprises the following steps: in the refrigeration mode, the ratio between the total capacity of the indoor units in the refrigeration state and the capacity of the outdoor units is smaller than or equal to a preset ratio, the exhaust pressure value of the compressor is larger than a preset pressure value, and the difference between the return air temperature and the air outlet temperature of the indoor units in the refrigeration state is smaller than a preset temperature difference; or in the heating mode, the ratio between the total capacity of the indoor unit in the heating state and the capacity of the outdoor unit is smaller than or equal to a preset ratio, the exhaust pressure value of the compressor is larger than a preset pressure value, and the difference between the air outlet temperature and the air return temperature of the indoor unit in the heating state is smaller than a preset temperature difference; when the target indoor unit meets the starting condition of the liquid storage function, the outdoor electromagnetic valve in the outdoor unit is controlled to be opened.
It should be understood that, when the multi-split air conditioning system is in the refrigeration mode, if the exhaust pressure value of the compressor is greater than the preset pressure value and the difference between the return air temperature and the outlet air temperature of the indoor unit is less than the preset temperature difference, this indicates that the refrigerant in the air conditioning system does not perform sufficient heat exchange at this time, the air pressure near the condenser is increased, and the air conditioning system operates under a small load. At this time, the circulating refrigerant amount required by the multi-split air conditioning system is relatively small. Considering that the refrigerant amount of the multi-split air conditioning system is relatively more, the unit operation frequency is low, and the refrigerating or heating effect is poor. Similarly, if the multi-split air conditioning system is in the heating mode and the exhaust pressure value of the compressor is larger than the preset pressure value and the difference between the air outlet temperature and the return air temperature of the indoor unit is smaller than the preset temperature difference, the air conditioning system is also in the small-load operation. In this case, a cooling or heating liquid storage mode may be activated, storing excess refrigerant in the hot gas bypass loop. After the outdoor solenoid valve is opened, part of refrigerant output by the compressor enters a pipeline between the outdoor solenoid valve and the bypass branch solenoid valve after passing through the four-way valve, so that part of refrigerant is stored, the load of the compressor is reduced, and the refrigerating or heating effect is improved.
In a second aspect, an embodiment of the present application provides a control method of a multi-split air conditioning system, where the method includes: controlling the multi-split air conditioning system to operate in a refrigeration drying mode or a heating defrosting mode; when the multi-split air conditioning system operates in a refrigeration drying mode or a heating defrosting mode: for an outdoor unit in the multi-split air conditioning system, an outdoor electromagnetic valve is opened, and an outdoor heat exchanger works as a condenser; for a first type indoor unit in the multi-split air conditioning system, a bypass branch electromagnetic valve is opened, a circulation branch electromagnetic valve is closed, and an indoor heat exchanger works as a condenser; for the second type indoor unit in the multi-split air conditioning system, the bypass branch electromagnetic valve is closed, the circulation branch electromagnetic valve is opened, and the indoor heat exchanger works as an evaporator.
In some embodiments, the controlling the multi-split air conditioning system to operate in a cooling and drying mode or a heating and defrosting mode includes: acquiring the running state of each indoor unit under the condition that the multi-split air conditioning system is in a refrigerating mode; if part of the indoor units are in the shutdown state, judging whether the indoor units in the shutdown state exist or not, wherein the indoor units meet the starting condition of the drying function; if the indoor unit is in the shutdown state and meets the starting condition of the drying function, the indoor unit in the refrigeration state is used as a first type indoor unit, and the indoor unit in the refrigeration state is used as a second type indoor unit, so that the multi-split air conditioning system is controlled to operate in a refrigeration drying mode.
In some embodiments, the drying function starting conditions of the multi-split air conditioning system include: the temperature of the refrigerant liquid pipe of the indoor unit is smaller than the difference between the dew point temperature of the environment where the indoor unit is positioned and the first temperature compensation value within the first preset time.
In some embodiments, the above method further comprises: when the multi-split air conditioning system is in a refrigeration drying mode, controlling an indoor fan of a first type indoor unit to operate according to a first air quantity; after the air volume adjusting condition is met, controlling the indoor fan of the first type indoor unit to operate according to a second air volume, wherein the second air volume is larger than the first air volume, and the air volume adjusting condition comprises the following steps: the temperature of the refrigerant liquid pipe of the first type indoor unit is larger than the sum of the dew point temperature of the environment where the first type indoor unit is positioned and a second temperature compensation value within a second preset time period; and after the third preset time period passes, controlling the indoor fans of the first type indoor units to stop running.
In some embodiments, the above method further comprises: setting the opening degree of an indoor expansion valve of the first type indoor unit as an initial opening degree; and adjusting the opening degree of the indoor expansion valve of the first-type indoor unit according to the temperature of the refrigerant liquid pipe of the first-type indoor unit so that the temperature of the refrigerant liquid pipe of the first-type indoor unit is greater than or equal to the dew point temperature of the environment where the first-type indoor unit is positioned.
In some embodiments, the adjusting the opening of the indoor expansion valve of the first type indoor unit according to the refrigerant liquid pipe temperature of the first type indoor unit includes: determining a first opening change value of the nth adjusting period according to the opening of the indoor expansion valve of the first type indoor unit of the nth-1 adjusting period; determining a second opening degree change value of the nth adjusting period according to the refrigerant liquid pipe temperature of the first type indoor unit in the nth adjusting period, the dew point temperature of the environment of the first type indoor unit in the nth adjusting period, the refrigerant liquid pipe temperature of the first type indoor unit in the nth-1 adjusting period and the dew point temperature of the environment of the first type indoor unit in the nth-1 adjusting period; and determining the opening degree of the indoor expansion valve of the first type indoor unit of the nth adjusting period according to the opening degree of the indoor expansion valve of the first type indoor unit of the nth-1 adjusting period, the first opening degree change value of the nth adjusting period and the second opening degree change value of the nth adjusting period.
In some embodiments, the above method further comprises: judging whether the first type indoor unit meets the exit condition of the drying function; and when the first type indoor unit meets the exit condition of the drying function, controlling a bypass branch electromagnetic valve in the first type indoor unit to be closed.
In some embodiments, the drying function exit condition described above includes: the temperature of the refrigerant liquid pipe of the indoor unit is larger than or equal to the sum of the dew point temperature of the environment where the indoor unit is positioned and a third temperature compensation value within a third preset time period.
In some embodiments, the controlling the multi-split air conditioning system to operate in a cooling and drying mode or a heating and defrosting mode includes: judging whether the outdoor unit meets the starting condition of the defrosting function or not under the condition that the multi-split air conditioning system is in a heating mode; when the outdoor unit meets the defrosting starting condition, judging whether the ratio between the total capacity of the indoor unit in a heating state and the capacity of the outdoor unit is smaller than or equal to a preset ratio; if yes, the indoor unit in the heating state is used as a first type indoor unit, the indoor unit in the stopping state is used as a second type indoor unit, and the multi-split air conditioning system is controlled to operate in a heating defrosting mode.
In some embodiments, the defrosting function starting condition includes that the refrigerant tube temperature of the outdoor unit is less than or equal to a difference between the outdoor ambient temperature and a fourth temperature compensation value within a fourth preset time period.
In some embodiments, the above method further comprises: after the multi-split air conditioning system starts to operate in a heating defrosting mode, judging whether the outdoor unit meets a defrosting function exit condition or not; if the outdoor unit meets the defrosting function exit condition, controlling the multi-split air conditioning system to operate in a heating mode; if the outdoor unit does not meet the defrosting function exit condition, controlling the multi-split air conditioning system to operate in a heating mode when the duration of operating in heating and defrosting of the multi-split air conditioning system reaches a fifth preset duration.
In some embodiments, the defrosting function exit condition includes that the refrigerant liquid pipe temperature of the outdoor unit is greater than a sum of the outdoor ambient temperature and a fifth temperature compensation value within a sixth preset duration.
In some embodiments, the above method further comprises: under the condition that the multi-split air conditioning system is in a refrigerating mode or a heating mode, judging whether the liquid storage function starting condition is met or not, wherein the liquid storage function starting condition comprises the following steps: in the refrigeration mode, the ratio between the total capacity of the indoor units in the refrigeration state and the capacity of the outdoor units is smaller than or equal to a preset ratio, the exhaust pressure value of the compressor is larger than a preset pressure value, and the difference between the return air temperature and the air outlet temperature of the indoor units in the refrigeration state is smaller than a preset temperature difference; or in the heating mode, the ratio between the total capacity of the indoor unit in the heating state and the capacity of the outdoor unit is smaller than or equal to a preset ratio, the exhaust pressure value of the compressor is larger than a preset pressure value, and the difference between the air outlet temperature and the air return temperature of the indoor unit in the heating state is smaller than a preset temperature difference; when the target indoor unit meets the starting condition of the liquid storage function, the outdoor electromagnetic valve in the outdoor unit is controlled to be opened.
In a third aspect, an embodiment of the present application provides a control device for a multi-split air conditioning system, including: one or more processors; one or more memories; wherein the one or more memories are configured to store computer program code comprising computer instructions that, when executed by the one or more processors, cause the controller to perform the method provided in the second aspect and possible implementations.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium comprising computer instructions which, when run on a computer, cause the computer to perform the method provided in the second aspect and in a possible implementation manner.
In a fifth aspect, embodiments of the present application provide a computer program product comprising computer instructions which, when run on a computer, cause the computer to perform the method provided in the second aspect and possible implementations described above.
It should be noted that the above-mentioned computer instructions may be stored in whole or in part on a computer-readable storage medium. The computer readable storage medium may be packaged together with the processor of the controller or may be packaged separately from the processor of the controller, which is not limited in the present application.
The advantageous effects described in the second to fifth aspects of the present application may be referred to for the advantageous effect analysis of the first aspect, and will not be described here again.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.
Fig. 1 is a schematic structural diagram of a multi-split air conditioning system according to some embodiments;
fig. 2 is a schematic diagram of a refrigerant circulation principle of a multi-split air conditioning system according to some embodiments;
FIG. 3 is a schematic diagram of a refrigerant circulation principle of another multi-split air conditioning system according to some embodiments;
fig. 4 is a schematic diagram of a control method of an indoor fan of a multi-split air conditioning system according to some embodiments;
fig. 5 is a schematic diagram of a control method of an indoor expansion valve of a multi-split air conditioning system according to some embodiments;
fig. 6 is a schematic diagram of a refrigerant circulation principle of a multi-split air conditioning system according to another embodiment;
FIG. 7 is a schematic diagram of a control method of a multi-split air conditioning system according to some embodiments;
FIG. 8 is a schematic diagram of a refrigerant circulation principle of a multi-split air conditioning system according to another embodiment;
FIG. 9 is a second schematic diagram of a control method of another multi-split air conditioning system according to some embodiments;
fig. 10 is a schematic diagram of a hardware architecture of a controller according to some embodiments.
Reference numerals: 100-multi-split air conditioning system; 200-an outdoor unit; 201-an outdoor heat exchanger; 202-a compressor; 203-a four-way valve; 204-a bypass shutoff valve; 205-an outdoor solenoid valve; 206-an outdoor throttle device; 207-an outdoor liquid pipe temperature sensor; 300A-a first indoor unit; 301A-a first indoor heat exchanger; 302A-a first indoor expansion valve; 303A-a first bypass solenoid valve; 304A-a first circulation branch solenoid valve; 305A-a first indoor liquid tube temperature sensor; 306A-a first indoor fan; 300B-a second indoor unit; 301B-a second indoor heat exchanger; 302B-a second indoor expansion valve; 303B-a second bypass solenoid valve; 304B-a second circulation branch solenoid valve; 305B-a second indoor liquid tube temperature sensor; 306B-a second indoor fan; 300C-a third indoor unit; 301C-a third indoor heat exchanger; 302C-a third indoor expansion valve; 303C-a third bypass solenoid valve; 304C-a third circulation branch solenoid valve; 305C-a third indoor liquid tube temperature sensor; 306C-third indoor fan.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art. In addition, when describing a pipeline, the terms "connected" and "connected" as used herein have the meaning of conducting. The specific meaning is to be understood in conjunction with the context.
Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and its other forms such as the third person referring to the singular form "comprise" and the present word "comprising" are to be construed as open, inclusive meaning, i.e. as "comprising, but not limited to. In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", "some examples", "and the like are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
As described in the background art, condensation water is easily generated on the surface of an indoor heat exchanger during refrigeration of the multi-split air conditioning system, and the condensation water can cause bacteria to grow on the surface of the heat exchanger and generate peculiar smell. In order to solve the problem, a condensation water tray is arranged at the tail end equipment of the multi-split air conditioning system in the related art, and when the condensation water in the condensation water tray reaches a certain amount, a gravity valve arranged at the bottom of the condensation water tray is opened to drain water to the chassis. Like this, although can play certain get rid of the condensate water function, because the condensate water dish just discharges water after ponding reaches a certain amount, consequently still can remain moisture, and then breeds the bacterium, can't eradicate the peculiar smell.
In addition, in order to solve the problem of frosting of the outdoor unit during heating, when frosting of the outdoor unit of the air conditioner is detected, the related technology switches all indoor units of the whole multi-split air conditioning system into refrigeration operation, and the outdoor unit heats up to melt the frost of the outdoor unit; in this way, although a certain defrosting function can be achieved, all indoor units can be cooled under the condition of heating, the room temperature is reduced, and the heating effect of the air conditioning system is reduced.
In this regard, the embodiment of the application provides a multi-split air conditioning system, which is provided with a refrigerant bypass branch at each indoor unit, and when the heat exchanger of a certain indoor unit needs to remove condensate, the refrigerant bypass branch of the indoor unit can be independently communicated, so that the indoor unit is switched to a heating mode to remove condensate, and meanwhile, other indoor units still normally refrigerate while the indoor unit removes condensate, and the refrigerating experience of a user is not affected.
In addition, when the multi-split air conditioning system is in a heating mode, if the heat exchanger of the outdoor unit needs to defrost, the multi-split air conditioning system can be switched into a cooling mode so as to realize the defrosting purpose. And after the multi-split air conditioning system is switched to the refrigerating mode, the refrigerant bypass branch of the heat exchanger of the indoor unit needing to be heated can be communicated, so that the indoor unit is switched to the heating mode, and the use of a user is not influenced.
For further description of the scheme of the present application, fig. 1 is a schematic structural diagram of a multi-split air conditioning system according to an embodiment of the present application.
Referring to fig. 1, the multi-split air conditioning system 100 includes an outdoor unit 200 and a plurality of indoor units (e.g., a first indoor unit 300A, a second indoor unit 300B, and a third indoor unit 300C shown in fig. 1) connected in parallel. In some embodiments, multi-split air conditioning system 100 also includes a controller (not shown in fig. 1).
The outdoor unit 200 includes: an outdoor heat exchanger 201, a compressor 202, a four-way valve 203, a bypass shutoff valve 204, an outdoor solenoid valve 205, and an outdoor throttle device 206. In some embodiments, the outdoor unit further includes an outdoor liquid pipe temperature sensor 207.
The first indoor unit 300A includes: a first indoor heat exchanger 301A, a first indoor expansion valve 302A, a first bypass-branch solenoid valve 303A, and a first circulation-branch solenoid valve 304A. In some embodiments, the first indoor unit 300A further includes a first indoor liquid pipe temperature sensor 305A and a first indoor fan 306A.
The second indoor unit 300B includes: a second indoor heat exchanger 301B, a second indoor expansion valve 302B, a second bypass-branch solenoid valve 303B, and a second circulation-branch solenoid valve 304B. In some embodiments, the second indoor unit 300B further includes a second indoor liquid pipe temperature sensor 305B and a second indoor fan 306B.
The third indoor unit 300C includes: a third indoor heat exchanger 301C, a third indoor expansion valve 302C, a third bypass solenoid valve 303C, and a third circulation bypass solenoid valve 304C. In some embodiments, the first indoor unit 300C further includes a third indoor fluid pipe temperature sensor 305C and a third indoor fan 306C.
In some embodiments, the compressor 202, the four-way valve 203, the outdoor heat exchanger 201 in the outdoor unit 200, and the indoor expansion valve, the indoor heat exchanger, and the circulation branch electromagnetic valve in each indoor unit are sequentially connected through pipelines to form a refrigerant circulation loop.
In some embodiments, the discharge port of the compressor 202, the outdoor throttling device 206, the outdoor solenoid valve 205, the bypass cut-off valve 204 in the outdoor unit 200, and the bypass solenoid valve and the indoor heat exchanger in each indoor unit are sequentially connected through pipelines to form a refrigerant bypass.
It should be noted that the number of the indoor units is merely an example, and the number of the indoor units of the multi-split air conditioning system shown in the present application may be two or more, which is not limited in the present application.
The functions and arrangement of the respective components of the outdoor unit 200 are described in detail below.
In some embodiments, the outdoor heat exchanger 201 is connected to the compressor 202 at one end via the four-way valve 203 and to the indoor heat exchanger at the other end. The outdoor heat exchanger 201 is configured to exchange heat between the outdoor air and the refrigerant flowing through the heat transfer pipe of the outdoor heat exchanger 201.
In some embodiments, the compressor 202 is disposed between the indoor heat exchanger and the outdoor heat exchanger 201 for powering the refrigerant cycle. Taking a refrigeration cycle as an example, the compressor 202 sends a compressed refrigerant to the outdoor heat exchanger 201 through the four-way valve 203. Alternatively, the compressor 202 may be a variable capacity inverter compressor 202 controlled based on the rotational speed of the inverter.
In some embodiments, four ports of the four-way valve 203 are respectively connected to the exhaust port of the compressor 202, the outdoor heat exchanger 201, the air suction port of the compressor 202, and the indoor heat exchangers of the respective indoor units. The four-way valve 203 is used to change the flow direction of the refrigerant in the system pipeline to realize the mutual conversion between the cooling mode and the heating mode.
In some embodiments, the bypass cut-off valve 204 is disposed between the four-way valve 203 and the indoor heat exchangers of the indoor units, and the bypass cut-off valve 204 is kept in a normally open state after the multi-split air conditioning system is installed.
In some embodiments, the outdoor solenoid valve 205 is disposed on a refrigerant bypass branch between the four-way valve 203 and each indoor heat exchanger, for controlling the communication and cut-off of the refrigerant bypass branch.
In some embodiments, an outdoor throttle device 206 is disposed between the outdoor solenoid valve 205 and the compressor 202 for reducing the pressure of the high-temperature and high-pressure refrigerant delivered by the compressor discharge. For example, the outdoor throttle device 206 may include an electronic expansion valve and/or a capillary tube. Alternatively, the outdoor throttle device 206 may be provided between the outdoor solenoid valve 205 and the bypass shutoff valve 204. Alternatively, the outdoor throttle device 206 may be provided between the bypass shutoff valve 204 and each indoor unit. The application is not limited in this regard.
In some embodiments, the outdoor unit 200 further includes an outdoor fan (not shown) that generates an airflow of the outdoor air passing through the outdoor heat exchanger 201 to promote heat exchange between the refrigerant flowing in the heat transfer tubes of the outdoor heat exchanger 201 and the outdoor air.
In some embodiments, the outdoor unit 200 further includes an outdoor fan motor (not shown) connected to the outdoor fan for driving or varying the rotational speed of the outdoor fan.
In some embodiments, the outdoor unit 200 further includes a high-pressure switch (not shown in the figures), and the high-pressure switch is electrically connected to the controller, so as to monitor the pressure of the air conditioning pipeline, and when the pipeline pressure of the multi-split air conditioning system 100 is abnormal, send abnormal information to the controller, so that the controller controls the system to stop, and ensure the normal operation of the multi-split air conditioning system 100.
The functions and arrangement of the respective components of the first indoor unit 300A will be specifically described below.
In some embodiments, the first indoor heat exchanger 301A is configured to exchange heat between the refrigerant flowing in the heat transfer tube of the first indoor heat exchanger 301A and the indoor air.
In some embodiments, the first indoor expansion valve 302A is disposed between the first indoor heat exchanger 301A and the outdoor heat exchanger 201, and has a function of expanding and depressurizing the refrigerant flowing through the electronic expansion valve, and can be used to adjust the supply amount of the refrigerant in the pipeline. Alternatively, the multi-split air conditioning system 100 may be provided with a plurality of electronic expansion valves. When the electronic expansion valve decreases the opening degree, the flow path resistance of the refrigerant passing through the electronic expansion valve increases. When the electronic expansion valve increases the opening degree, the flow path resistance of the refrigerant passing through the electronic expansion valve decreases. In this way, even if the state of other devices in the circuit is not changed, when the opening degree of the electronic expansion valve is changed, the flow rate of the refrigerant flowing to the first indoor heat exchanger 301A or the outdoor heat exchanger 201 is also changed. It should be noted that the number of electronic expansion valves shown in fig. 1 is merely an example, and the present application is not limited thereto.
In some embodiments, a first bypass solenoid valve 303A is disposed between the first indoor heat exchanger 301A and the four-way valve 203 for controlling the communication and the cut-off of the refrigerant bypass branch of the single indoor unit. It should be understood that the first bypass-branch electromagnetic valve 303A may be disposed between the bypass shutoff valve 204 and the four-way valve 203, or between the first indoor heat exchanger 301A and the four-way valve 203, so long as the first bypass-branch electromagnetic valve is disposed on the total branch of the bypass refrigerant branch of each indoor unit, which is not limited in the present application.
In some embodiments, a first circulation branch electromagnetic valve 304A is disposed between the first indoor heat exchanger 301A and the four-way valve 203, for controlling the communication and the cut-off of the refrigerant circulation branch of the single indoor unit.
In some embodiments, a first indoor liquid pipe temperature sensor 305A is disposed at the liquid pipe of the first indoor heat exchanger 301A for detecting the liquid pipe temperature of the first indoor heat exchanger 301A.
In some embodiments, the first indoor fan 306A generates an airflow of the indoor air passing through the first indoor heat exchanger 301A to promote heat exchange of the refrigerant flowing in the heat transfer tubes of the first indoor heat exchanger 301A with the indoor air.
In some embodiments, the first indoor unit 300A further includes an indoor fan motor (not shown) connected to the indoor fan for driving or changing the rotational speed of the indoor fan.
In some embodiments, the first indoor unit 300A further includes a plurality of capillaries (not shown in the figure) for reducing the pressure of the refrigerant in the pipeline, and reducing the pressure of the high-pressure refrigerant sent from the condenser and then sending the high-pressure refrigerant to the evaporator.
In some embodiments, the first indoor unit 300A further includes a humidity sensor (not shown) for detecting the relative humidity of the indoor air.
In some embodiments, the first indoor unit 300A further includes a dew point meter (not shown) for detecting an ambient dew point temperature in the vicinity of the indoor heat exchanger.
In some embodiments, the first indoor unit 300A further includes a display (not shown). The display is electrically connected with the controller. Optionally, a display is used to display a control panel of the multi-split air conditioning system 100, for example, the display may be used to display an indoor temperature or a current operation mode. Optionally, the display is connected to the controller, and the user can perform operations and set programs on the control panel through the display. Optionally, the display further includes a pressure sensor or a temperature sensor, and the display may transmit a user instruction to the control according to a gesture operation of the user, such as pressing a key, so as to implement a man-machine interaction function. Alternatively, the display may be a liquid crystal display, an organic light-emitting diode (OLED) display. The particular type, size, resolution, etc. of the display are not limited, and those skilled in the art will appreciate that the display may be modified in performance and configuration as desired.
In some embodiments, the controller refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal, and instruct the multi-split air conditioning system 100 to execute a control instruction. By way of example, the controller may be a central processing unit (central processing unit, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD), or any combination thereof. The controller may also be any other device having processing functionality, such as a circuit, device or software module, for which embodiments of the application are not limited in any way.
Although not shown in fig. 1, the multi-split air conditioning system 100 may further include a power supply device (such as a battery and a power management chip) for supplying power to each component, and the battery may be logically connected to the controller through the power management chip, so that functions such as power consumption management of the multi-split air conditioning system 100 are implemented through the power supply device.
In some embodiments, the multi-split air conditioning system at least has one or more of the following operation modes: a cooling mode, a cooling and drying mode, a heating and defrosting mode, and a defrosting mode. The above operation modes are specifically described below in conjunction with the description.
1. Refrigeration mode
When the multi-split air conditioning system is in a refrigerating mode, the indoor unit needing refrigeration can open the solenoid valve of the circulation branch and close the bypass branch. Thus, the indoor unit requiring refrigeration can operate as an evaporator.
For example, in connection with the multi-split air conditioning system 100 shown in fig. 1, assuming that the first indoor unit 300A, the second indoor unit 300B, and the third indoor unit 300C are all indoor units requiring refrigeration, the controller of the multi-split air conditioning system 100 controls the first circulation-by-pass solenoid valve 304A, the second circulation-by-pass solenoid valve 304B, and the third circulation-by-pass solenoid valve 304C to be opened, controls the first bypass-by-pass solenoid valve 303A, the second bypass-by-pass solenoid valve 303B, and the third bypass-by-pass solenoid valve 303C to be closed, and controls the outdoor solenoid valve 205 to be closed, and the bypass shutoff valve 204 to be closed. At this time, the refrigerant circulation direction is shown by an arrow in fig. 2.
Referring to fig. 2, the refrigerant circuit flowing through the first indoor unit 300A is: (1) → (2) → (3) → (4) → (7) → (10) → (18) → (19) → (1).
The refrigerant circuit flowing through the second indoor unit 300B is: (1) → (2) → (3) → (4) → (5) → (8) → (12) → (17) → (18) → (19) → (1).
The refrigerant circuit flowing through the third indoor unit 300C is: (1) → (2) → (3) → (4) → (5) → (6) → (9) → (14) → (16) → (17) → (18) → (19) → (1).
It can be seen that the first indoor unit 300A, the second indoor unit 300B, and the third indoor unit 300C are all in the cooling operation state at this time.
It should be understood that the embodiment shown in fig. 1 is only one example. In the refrigeration mode, each indoor unit of the multi-split air conditioning system may be in a refrigeration operation state (as shown in fig. 1), or only a part of the indoor units may be in a refrigeration operation state. For example, the multi-split air conditioning system may only have a portion of the indoor units on for cooling. For another example, the indoor unit may be in a shutdown state after reaching a preset temperature.
2. Refrigeration and drying mode
When the multi-split air conditioning system is in a refrigeration mode, as the indoor heat exchanger in the indoor unit works as an evaporator, the surface temperature of the indoor heat exchanger in the indoor unit is low, and condensation water can be generated on the surface. In this regard, when some indoor units need to clear up the condensate water, the multi-split air conditioning system can switch from the cooling mode to the cooling and drying mode. When the multi-split air conditioning system is switched to a refrigeration and drying mode, an outdoor electromagnetic valve is opened for an outdoor unit, a bypass branch electromagnetic valve is opened for a first type indoor unit (namely an indoor unit needing heating) in an indoor unit, a circulation branch electromagnetic valve is closed, and an indoor heat exchanger works as a condenser; for the second type indoor unit (i.e. the indoor unit which does not need heating), the bypass branch electromagnetic valve is closed, the circulation branch electromagnetic valve is opened, and the indoor heat exchanger works as an evaporator.
Therefore, in the refrigeration and drying mode, the first type indoor unit is used as a condenser for heating, so that condensed water on the surface of the heat exchanger of the first type indoor unit is evaporated, and the cleanliness of the multi-split air conditioning system is improved. In addition, when the first type indoor unit removes condensed water, the second type indoor unit works as an evaporator, and normal refrigeration is achieved, so that refrigeration experience of a user is not affected.
In some embodiments, the controller of the multi-split air conditioning system is configured to: acquiring the running state of each indoor unit under the condition that the multi-split air conditioning system is in a refrigerating mode; if part of the indoor units are in the shutdown state, judging whether the indoor units in the shutdown state exist or not, wherein the indoor units meet the starting condition of the drying function; if the indoor unit is in the shutdown state and meets the starting condition of the drying function, the indoor unit in the refrigeration state is used as a first type indoor unit, and the indoor unit in the refrigeration state is used as a second type indoor unit, so that the multi-split air conditioning system is controlled to operate in a refrigeration drying mode.
The shutdown state refers to a state of Wen Tingji of the multi-split air conditioning system, namely, a state that an air conditioner compressor stops running after the indoor temperature reaches the set temperature of an air conditioner.
It should be understood that the indoor unit in the stopped state has reached the cooling temperature and completed the cooling process, and the condensed water is likely to adhere to the surface of the indoor heat exchanger, so that the indoor unit in the stopped state and meeting the starting condition of the drying function is used as the first type of indoor unit, i.e. is used as the condenser, and the condensed water on the surface of the indoor heat exchanger of the indoor unit can be evaporated to realize the drying function. The room controlled by the indoor unit in the refrigerating state still does not reach the preset temperature, so the indoor unit in the refrigerating state is used as the second type indoor unit to work, the indoor unit in the refrigerating state normally refrigerates, and the refrigerating experience of a user is not affected.
In some embodiments, the drying function initiation condition comprises: the temperature of the refrigerant liquid pipe of the indoor unit is smaller than the difference between the dew point temperature of the environment where the indoor unit is positioned and the first temperature compensation value within the first preset time.
The dew point temperature is the temperature at which air is cooled to saturation under the condition that the water vapor content and the air pressure are not changed.
Alternatively, the multi-split air conditioning system measures dew point temperature by a built-in dew point meter. Optionally, the controller of the multi-split air conditioning system obtains the dry-bulb temperature of the indoor air through a built-in indoor temperature sensor, obtains the relative humidity of the indoor air through a built-in indoor humidity sensor, and calculates the dew point temperature of the environment where the indoor unit is located according to the dry-bulb temperature and the relative humidity of the indoor air. The application is not limited to a specific manner of obtaining the dew point temperature.
It should be understood that when the temperature of the refrigerant liquid pipe of the indoor unit is less than the difference between the ambient dew point temperature and the first temperature compensation value, it is indicated that the heat exchanger of the indoor unit is more humid and is prone to generate condensation water. Considering that a detection error exists in single measurement, if the indoor unit constantly meets the condition that the temperature of the refrigerant liquid pipe is smaller than the difference between the ambient dew point temperature and the first temperature compensation value within the first preset time period, the heat exchanger of the indoor unit is considered to be more moist, the starting condition of a drying function is met, and the indoor unit is further dried.
In order to further explain the specific working conditions of each component of the multi-split air conditioning system in the refrigeration and drying mode, as shown in fig. 3, the refrigerant circulation process of the multi-split air conditioning system 100 is specifically described below by taking the example that the first indoor unit 300A and the second indoor unit 300B are in the refrigeration state and the third indoor unit 300C is in the shutdown state and the drying function starting condition is satisfied.
Referring to fig. 3, when the multi-split air conditioning system is in the cooling and drying mode, the controller of the multi-split air conditioning system 100 controls the first circulation-by-pass solenoid valve 304A and the second circulation-by-pass solenoid valve 304B to be opened, controls the third circulation-by-pass solenoid valve 304C to be closed, controls the first bypass-by-pass solenoid valve 303A and the second bypass-by-pass solenoid valve 303B to be closed, controls the third bypass-by-pass solenoid valve 303C to be opened, and controls the outdoor solenoid valve 205 to be opened and the bypass shutoff valve 204 to be opened. At this time, the refrigerant circulation direction is shown by an arrow in fig. 3.
Referring to fig. 3, the refrigerant circuit flowing through the first indoor unit 300A is: (1) → (2) → (3) → (4) → (7) → (10) → (18) → (19) → (1).
The refrigerant circuit flowing through the second indoor unit 300B is: (1) → (2) → (3) → (4) → (5) → (8) → (12) → (17) → (18) → (19) → (1).
The refrigerant circuit flowing through the third indoor unit 300C is: (1) The method comprises the steps of (1) 20, (21) 22, (23) 15, (9) 6, (7) or (8), 18, (19) and (1).
It can be seen that, at this time, the multi-split air conditioning system 100 is in the cooling and drying mode, where the first indoor unit 300A and the second indoor unit 300B operate as the second type indoor units, and are in the cooling operation state, and the third indoor unit 300C operates as the first type indoor units, and is in the drying mode. Therefore, when the heat exchanger of the third indoor unit needs to remove the condensate water, the refrigerant bypass branch of the third indoor unit is independently communicated, so that the third indoor unit is switched to a heating mode to remove the condensate water, and meanwhile, the first indoor unit and the second indoor unit are guaranteed to still normally refrigerate while the condensate water is removed by the third indoor unit, and the refrigerating experience of a user is not influenced.
In some embodiments, as shown in fig. 4, when the multi-split air conditioning system is in the cool drying mode, the controller may be further configured to: controlling an indoor fan of a first type indoor unit to run according to a first air quantity; after the air quantity adjusting conditions are met, the indoor fans of the first type indoor units are controlled to operate according to second air quantity, and the second air quantity is larger than the first air quantity. And after the third preset time period passes, controlling the indoor fans of the first type indoor units to stop running.
Optionally, the air volume adjustment condition includes: the temperature of the refrigerant liquid pipe of the first type indoor unit is larger than the sum of the dew point temperature of the environment where the first type indoor unit is located and the second temperature compensation value within the second preset time period.
It should be appreciated that when the multi-split air conditioning system is in the cool and dry mode, the first type of indoor unit operates as a condenser in the heating mode. At this time, the air near the heat exchanger of the first type indoor unit is heated by the lower first air quantity, and then kept near the indoor heat exchanger, so that heat is accumulated, and condensation water on the surface of the indoor heat exchanger of the first type indoor unit is evaporated more quickly. After the air quantity adjusting condition is met, the condensed water of the indoor heat exchanger of the first type indoor unit is evaporated, and the operation of the indoor fan is controlled by the second larger air quantity so as to discharge the evaporated condensed water vapor out of the indoor unit. Further, when the indoor fan is operated for a third preset time at the second air volume, the indoor fan is turned off. So that the first type indoor unit does not send hot air to the indoor any more, thereby improving the comfort of the environment temperature.
In some embodiments, when the multi-split air conditioning system is in the refrigeration drying function, the controller of the multi-split air conditioning system is configured to: and adjusting the opening of the indoor expansion valve of the first type indoor unit according to the temperature of the refrigerant liquid pipe of the first type indoor unit.
Alternatively, the specific opening adjustment mode may be: and determining a first opening change value of the nth adjusting period according to the opening of the indoor expansion valve of the first type indoor unit of the nth-1 adjusting period. And determining a second opening degree change value of the nth adjusting period according to the refrigerant liquid pipe temperature of the first type indoor unit in the nth adjusting period, the dew point temperature of the environment of the first type indoor unit in the nth adjusting period, the refrigerant liquid pipe temperature of the first type indoor unit in the (n-1) th adjusting period and the dew point temperature of the environment of the first type indoor unit in the (n-1) th adjusting period. And determining the opening degree of the indoor expansion valve of the first type indoor unit of the nth adjusting period according to the opening degree of the indoor expansion valve of the first type indoor unit of the nth-1 adjusting period, the first opening degree change value and the second opening degree change value of the nth adjusting period.
As a specific example, as shown in fig. 5, the adjustment of the opening degree of the indoor expansion valve according to the refrigerant liquid pipe temperature of the first type indoor unit may be specifically implemented as the following steps:
sa1, the multi-split air conditioning system starts a refrigeration drying function.
Sa2, the initial opening EVI (i, 0) of the indoor expansion valve of the i-th first-type indoor unit is set to EVI (i, 0) =0, and the adjustment cycle of the indoor expansion valve is set to n, the initial value of n being 0.
Sa3, the indoor expansion valve opening EVI (i, n-1) of the first type indoor unit of the nth-1 adjusting period is obtained.
Wherein n is a positive integer.
Sa41 for determining a first opening change value of the nth adjustment period as DeltaEVI based on the opening EVI (i, n-1) of the indoor expansion valve of the first type indoor unit of the nth adjustment period 1 （i，n）=M 3 * EVI（i，n-1）。
Wherein M is 3 The control constants are overshoot and undershoot.
Sa42, determining a target temperature difference delta T1 (i, N) =T (i, N) -Tdew (i, N) +N, N in the nth adjustment period as a target temperature correction coefficient of the refrigerant liquid pipe according to the refrigerant liquid pipe temperature T (i, N) in the nth adjustment period of the first type indoor unit and the dew point temperature Tdew (i, N) of the environment in the nth adjustment period; determining a target temperature difference delta T1 (i, N-1) =T (i, N-1) -Tdew (i, N-1) +N in the N-1 th adjustment period according to the refrigerant liquid pipe temperature T (i, N-1) in the N-1 th adjustment period and the dew point temperature Tdew (i, N-1) of the environment in the N-1 th adjustment period; determining the second opening degree variation value as DeltaEVI in the nth adjustment period according to the target temperature difference DeltaT 1 (i, n) in the nth adjustment period and the target temperature difference DeltaT 1 (i, n-1) in the nth-1 adjustment period 2 （i，n）=M 1 *(△T1(i,n)-△T1(i,n-1))+M 2 *△T1(i,n)；M 1 、M 2 Is a control constant.
It should be noted that, step Sa42 may be performed before step Sa41, may be performed after step Sa41, or may be performed simultaneously with step Sa41, which is not limited by the present application.
Sa5, first opening degree variation value DeltaEVI of first type indoor unit according to n-1 th adjustment period 1 (i, n) and a second opening degree variation value ΔEVI 2 (i, n), determining that the opening degree variation value of the first type indoor unit of the nth adjustment period is Δevi (i, n) = Δevi 1 （i，n）+△EVI 2 （i，n）。
Sa6, determining that the opening degree of the indoor expansion valve of the first type indoor unit in the nth adjustment period is EVI (i, n) =EVI (i, n-1) +delta EVI (i, n) according to the opening degree variation value delta EVI (i, n) and the indoor expansion valve opening degree EVI (i, n-1) of the first type indoor unit in the nth adjustment period, and adding one to the adjustment period n.
In some embodiments, the multi-split air conditioning system repeatedly performs steps Sa3 to Sa6 described above until the air conditioning system exits the refrigeration drying function.
It should be understood that, when the temperature of the liquid pipe of the first type indoor unit is lower than the ambient dew point temperature, condensation water is generated, and the steps Sa1 to Sa6 adjust the opening of the indoor expansion valve according to the temperature of the liquid pipe of the first type indoor unit, so that the temperature of the liquid pipe of the first type indoor unit tends to be higher than the ambient dew point temperature of the indoor unit along with the adjustment of the electronic expansion valve, and the condensation water of the indoor unit is evaporated at a high temperature.
In some embodiments, the controller of the multi-split air conditioning system may be further configured to: judging whether the first type indoor unit meets the exit condition of the drying function; and when the first type indoor unit meets the exit condition of the drying function, controlling a bypass branch electromagnetic valve in the first type indoor unit to be closed. So that the indoor unit is closed in time after the drying condition is met, thereby transferring the refrigerant which should pass through the indoor unit into other indoor units and improving the refrigerating effect.
Further, after the first type indoor unit meets the exit condition of the drying function, the circulation branch electromagnetic valve of the first type indoor unit can be opened, so that the indoor unit is converted into the second type indoor unit, and the cooling mode is entered after the drying function is completed. It should be appreciated that the first type of indoor unit actually operates as a condenser when performing the drying function, and has a heating effect. In order to further reduce the room temperature, the first type indoor unit can be converted into the second type indoor unit after drying, and the second type indoor unit can work as an evaporator to perform refrigeration, so that the comfort of a user is improved.
In some embodiments, the exit condition of the drying function is that the temperature of the refrigerant liquid pipe of the indoor unit is greater than or equal to the sum of the dew point temperature of the environment in which the indoor unit is located and the third temperature compensation value within the third preset time period.
It should be understood that if the temperature of the refrigerant liquid pipe of the indoor unit is greater than or equal to the sum of the dew point temperature of the environment where the indoor unit is located and the third temperature compensation value, the heat exchanger surface of the indoor unit is drier, so that the bypass solenoid valve of the indoor unit is closed to terminate the bypass refrigerant flow of the indoor unit. In consideration of the sensitivity of the sensor, it is therefore possible to detect whether the above condition is satisfied or not a plurality of times in succession within the third preset period of time, to improve the reliability of the detection.
3. Drying mode
When the multi-split air conditioning system is in a refrigeration mode, as the indoor heat exchanger in the indoor unit works as an evaporator, the surface temperature of the indoor heat exchanger in the indoor unit is low, and condensation water can be generated on the surface. In this regard, when all indoor units need to be cleaned of condensation water, the multi-split air conditioning system may be switched from a cooling mode to a drying mode. When the multi-split air conditioning system is in a drying mode, the outdoor heat exchangers of the multi-split air conditioning system work as evaporators, and the indoor heat exchangers work as condensers.
In connection with the multi-split air conditioning system 100 shown in fig. 1, the controller of the multi-split air conditioning system 100 controls the first circulation-bypass solenoid valve 304A, the second circulation-bypass solenoid valve 304B, and the third circulation-bypass solenoid valve 304C to be opened, controls the first bypass-bypass solenoid valve 303A, the second bypass-bypass solenoid valve 303B, and the third bypass-bypass solenoid valve 303C to be closed, and controls the outdoor solenoid valve 205 to be closed, and the bypass shutoff valve 204 to be closed. At this time, the refrigerant circulation direction is shown by an arrow in fig. 6.
Referring to fig. 6, the refrigerant circuit flowing through the first indoor unit 300A is: (1) → (2) → (18) → (10) → (7) → (4) → (3) → (19) → (1).
The refrigerant circuit flowing through the second indoor unit 300B is: (1) → (2) → (18) → (17) → (12) → (8) → (5) → (4) → (3) → (19) → (1).
The refrigerant circuit flowing through the third indoor unit 300C is: (1) → (2) → (18) → (17) → (16) → (14) → (9) → (6) → (5) → (4) → (3) → (19) → (1).
It can be seen that the first indoor unit 300A, the second indoor unit 300B, and the third indoor unit 300C are all in the heating operation state at this time. It should be understood that at this time, the heat exchangers of the respective indoor units operate as condensers, thereby releasing heat and evaporating condensed water on the surfaces of the indoor heat exchangers.
In some embodiments, when the multi-split air conditioning system is in the dry mode, the compressor of the multi-split air conditioning system is operated at a low frequency and the outdoor fan is operated at a low wind.
It should be understood that in the drying mode, the outdoor temperature of the multi-split air conditioning system is higher, so that the suction pressure of the outdoor unit is higher, and the discharge pressure of the indoor unit is also higher. In addition, the low-wind operation of the fan can enable heating to be less in the drying mode, the influence of the drying mode on the room temperature is reduced, and indoor comfort is improved.
Fig. 7 illustrates a control method of the multi-split air conditioning system, which is used to switch the operation modes of the multi-split air conditioning system 100 among a cooling mode, a cooling and drying mode, and a drying mode.
Referring to fig. 7, when the multi-split air conditioning system is in a cooling mode, it is detected whether there are indoor units that are already on but in a stopped state in the multi-split air conditioning system.
If so, detecting whether the indoor unit in the shutdown state meets the refrigeration and drying conditions.
If the indoor units in the shutdown state meet the refrigeration and drying conditions, judging whether the indoor units which are started in the multi-split air conditioning system are in the shutdown state.
If all the indoor units which are started in the multi-split air conditioning system are in a stop state, controlling the air conditioning system to enter a drying mode, and switching a four-way valve of the air conditioning system into a heating state; or if the indoor units which are started in the multi-split air conditioning system are not in the stop state, controlling the air conditioning system to enter a refrigeration drying mode.
Judging whether the indoor unit of the multi-split air conditioning system meets the exit condition of the drying function, and if so, switching the operation mode of the multi-split air conditioning system into a refrigeration mode; or if the operation duration of the air conditioning system in the operation drying mode or the refrigeration drying mode exceeds the preset duration, switching the operation mode of the multi-split air conditioning system into the refrigeration mode.
It should be understood that when the air conditioning system is in the refrigeration mode, the indoor units of the air conditioning system are prone to generate condensed water, so that whether each indoor unit of the multi-split air conditioning system meets the starting condition of the refrigeration and drying function is detected, and if so, the indoor units in the shutdown state are the indoor units which are shutdown after reaching the preset temperature, so that the indoor units in the shutdown state complete drying according to the shutdown condition of the indoor units, and the influence of the drying process on the room temperature is reduced. Further, after the exit condition of the drying function is satisfied, the air conditioning system is switched to a refrigeration mode, and each indoor unit continues normal refrigeration.
4. Heating mode
When the multi-split air conditioning system is in the heating mode, the outdoor heat exchanger works as an evaporator, and the controller of the multi-split air conditioning system 100 controls the first circulation-bypass solenoid valve 304A, the second circulation-bypass solenoid valve 304B, and the third circulation-bypass solenoid valve 304C to be opened, controls the first bypass-bypass solenoid valve 303A, the second bypass-bypass solenoid valve 303B, and the third bypass-bypass solenoid valve 303C to be closed, and controls the outdoor solenoid valve 205 to be closed and the bypass shutoff valve 204 to be closed. At this time, the refrigerant circulation direction is still shown by the arrow in fig. 6.
Still referring to fig. 6, the refrigerant circuit flowing through the first indoor unit 300A is: (1) → (2) → (18) → (10) → (7) → (4) → (3) → (19) → (1). The refrigerant circuit flowing through the second indoor unit 300B is: (1) → (2) → (18) → (17) → (12) → (8) → (5) → (4) → (3) → (19) → (1). The refrigerant circuit flowing through the third indoor unit 300C is: (1) → (2) → (18) → (17) → (16) → (14) → (9) → (6) → (5) → (4) → (3) → (19) → (1).
It can be seen that the first indoor unit 300A, the second indoor unit 300B, and the third indoor unit 300C are all in the heating operation state at this time.
5. Heating defrosting mode
When the multi-split air conditioning system is in a heating mode, the outdoor unit heat exchanger works as an evaporator, so that the surface temperature of the outdoor unit heat exchanger is reduced, frost can be formed on the surface of the outdoor unit heat exchanger, and the heat exchange effect is affected. In this regard, when the outdoor heat exchanger needs to be defrosted, the multi-split air conditioning system may be switched from a heating mode to a heating defrosting mode. When the multi-split air conditioning system is in a heating defrosting mode, an outdoor electromagnetic valve is opened for an outdoor unit, and an outdoor heat exchanger works as a condenser; for a first type indoor unit (i.e. an indoor unit needing heating) in the indoor unit, a bypass branch electromagnetic valve is opened, a circulation branch electromagnetic valve is closed, and the indoor heat exchanger works as a condenser; for the second type indoor unit (i.e. the indoor unit which does not need heating) in the indoor unit, the bypass branch electromagnetic valve is closed, the circulation branch electromagnetic valve is opened, and the indoor heat exchanger works as an evaporator.
Therefore, the outdoor heat exchanger can work as a condenser in a heating and defrosting mode, so that frost on the surface of the outdoor heat exchanger is removed, and the heating effect is improved. In addition, the indoor heat exchanger in the first type indoor unit is used as a condenser for normal heating so as to ensure the heating experience of a user, the indoor heat exchanger in the second type indoor unit is used as an evaporator, a refrigerant loop is formed between the indoor heat exchanger and the first type indoor unit, and a refrigerant loop is formed between the indoor heat exchanger and the outdoor unit so as to ensure the normal defrosting.
In some embodiments, the controller of the multi-split air conditioning system is configured to: judging whether the outdoor unit meets the starting condition of the defrosting function or not under the condition that the multi-split air conditioning system is in a heating mode; when the outdoor unit meets the defrosting starting condition, judging whether the ratio between the total capacity of the indoor unit in a heating state and the capacity of the outdoor unit is smaller than or equal to a preset ratio; if yes, the indoor unit in the heating state is used as a first type indoor unit, the indoor unit in the stopping state is used as a second type indoor unit, and the multi-split air conditioning system is controlled to operate in a heating defrosting mode.
Wherein, the capacity refers to the refrigerating capacity. The shutdown state refers to a temperature control shutdown state of the multi-split air conditioning system, namely a state that an air conditioner compressor stops running after the indoor temperature reaches the set temperature of the air conditioner.
It should be understood that if the outdoor unit satisfies the defrosting function start condition, the multi-split air conditioner may be turned into a heating defrosting mode to complete defrosting. The indoor unit in the stop state is used as a second type indoor unit, namely, an evaporator, so as to be matched with the refrigerant circulation when the outdoor unit is used as a condenser. And the indoor unit in the heating state is used as a first type indoor unit and is used as a condenser to run, so that heating is continued to ensure the heating experience of a user.
In some embodiments, the defrosting function starting condition includes that the refrigerant pipe temperature of the outdoor unit is less than or equal to a difference between the outdoor ambient temperature and the fourth temperature compensation value for a fourth preset period of time. Optionally, the multi-split air conditioning system obtains the temperature of the refrigerant liquid pipe of the outdoor unit through an outdoor liquid pipe temperature sensor arranged in the outdoor unit. It should be understood that when the temperature of the liquid pipe of the outdoor unit is less than or equal to the difference between the outdoor ambient temperature and the fourth temperature compensation value, the surface of the heat exchanger of the outdoor unit is frosted, and the error of single detection temperature is considered, so that whether the temperature of the liquid pipe of the refrigerant of the outdoor unit is always less than or equal to the difference between the outdoor ambient temperature and the fourth temperature compensation value is judged within the fourth preset time period, so that the detection accuracy is improved.
In order to further explain the specific operation of each component of the multi-split air conditioning system in the heating and defrosting mode, as shown in fig. 8, the outdoor unit is used to satisfy the defrosting function starting condition, the second indoor unit 300B and the first indoor unit 300A are in the heating state, and the third indoor unit 300C is in the shutdown state, for example, the refrigerant circulation process of the multi-split air conditioning system 100 is specifically described.
When the multi-split air conditioning system is in the heating and defrosting mode, the four-way valve of the multi-split air conditioning system 100 is switched to the cooling mode, the outdoor heat exchanger 200 works as a condenser, the controller of the multi-split air conditioning system 100 controls the first circulation bypass solenoid valve 304A and the second circulation bypass solenoid valve 304B to be closed, the third circulation bypass solenoid valve 304C to be opened, the first bypass solenoid valve 303A and the second bypass solenoid valve 303B to be opened, the third bypass solenoid valve 303C to be closed, and the outdoor solenoid valve 205 to be opened. At this time, the refrigerant circulation direction is shown by an arrow in fig. 8.
It can be seen that, at this time, the multi-split air conditioning system 100 is in a heating and defrosting mode, wherein the first indoor unit 300A and the second indoor unit 300B operate as a first type indoor unit, are in a heating operation state, and the third indoor unit 300C operates as a second type indoor unit, and are in a defrosting mode. In this way, when the outdoor unit needs to defrost, the third indoor unit 300C in the shutdown state cooperates with the outdoor unit 200 to form a refrigerant circulation loop, and the first indoor unit 300A and the second indoor unit 300B in the heating state still continue to heat, so that the first indoor unit and the second indoor unit are ensured to heat normally while the outdoor unit defrost, and the heating experience of the user is not affected.
In some embodiments, after the multi-split air conditioning system starts to operate in a heating defrosting mode, judging whether the outdoor unit meets a defrosting function exit condition; if the outdoor unit meets the defrosting function exit condition, controlling the multi-split air conditioning system to operate in a heating mode; if the outdoor unit does not meet the defrosting function exit condition, controlling the multi-split air conditioning system to operate in a heating mode when the duration of operating in heating and defrosting of the multi-split air conditioning system reaches a fifth preset duration.
It should be understood that during heating and defrosting, the indoor unit in a stopped state starts to cool to match with the refrigerant circulation during defrosting of the outdoor unit. Therefore, when the outdoor unit meets the defrosting function exit condition, the outdoor unit finishes defrosting, and at the moment, the multi-split system is converted into a heating mode so as to stop indoor unit refrigeration in the defrosting mode, and further improve the indoor temperature. Or when the outdoor unit does not meet the exiting condition of the defrosting function, but the continuously running heating defrosting mode reaches the fifth preset duration, the indoor unit in the shutdown state is refrigerated for a long time, the outdoor unit is partially defrosted, and the whole multi-split system is converted into a heating mode to stop the indoor unit refrigeration in the defrosting mode so as to further improve the indoor temperature in order to ensure the comfort of the indoor temperature.
Optionally, the defrosting function exit condition includes that the refrigerant liquid pipe temperature of the outdoor unit is greater than the sum of the outdoor environment temperature and the fifth temperature compensation value within a sixth preset duration. It should be understood that if the temperature of the refrigerant liquid pipe of the outdoor unit is greater than the sum of the outdoor ambient temperature and the fifth temperature compensation value within the sixth preset time period, the surface temperature of the heat exchanger of the outdoor unit is higher, and defrosting is completed, so that the multi-split air conditioning system is controlled to operate in a heating mode so that the air conditioning system can heat normally. The single measurement error is considered, so that the refrigerant liquid pipe temperature of the outdoor unit can be continuously detected for multiple times within the sixth preset time length, and the detection reliability is improved.
6. Defrosting mode
When the multi-split air conditioning system is in a heating mode, the outdoor unit heat exchanger works as an evaporator, so that the surface temperature of the outdoor unit heat exchanger is reduced, frost can be formed on the surface of the outdoor unit heat exchanger, and the heat exchange effect is affected. In this regard, when the outdoor heat exchanger requires defrosting, the multi-split air conditioning system may be switched from the heating mode to the defrosting mode. When the multi-split air conditioning system is in a defrosting mode, the outdoor heat exchanger of the multi-split air conditioning system works as a condenser, and the indoor heat exchanger works as an evaporator. The controller of the multi-split air conditioning system 100 controls the first circulation-bypass solenoid valve 304A, the second circulation-bypass solenoid valve 304B, and the third circulation-bypass solenoid valve 304C to be opened, controls the first bypass-bypass solenoid valve 303A, the second bypass-bypass solenoid valve 303B, and the third bypass-bypass solenoid valve 303C to be closed, and the outdoor solenoid valve 205 to be closed, and the bypass shutoff valve 204 to be closed. At this time, the refrigerant circulation direction is shown by an arrow in fig. 2.
The refrigerant circuit flowing through the first indoor unit 300A is: (1) → (2) → (3) → (4) → (7) → (10) → (18) → (19) → (1).
The refrigerant circuit flowing through the second indoor unit 300B is: (1) → (2) → (3) → (4) → (5) → (8) → (12) → (17) → (18) → (19) → (1).
The refrigerant circuit flowing through the third indoor unit 300C is: (1) → (2) → (3) → (4) → (5) → (6) → (9) → (14) → (16) → (17) → (18) → (19) → (1).
It can be seen that the first indoor unit 300A, the second indoor unit 300B, and the third indoor unit 300C are all in a cooling operation state, and the outdoor heat exchanger serves as a condenser, thereby releasing heat, melting and evaporating frost on the surface of the outdoor heat exchanger.
It should be understood that the refrigerant flow direction of the multi-split air conditioning system in the defrosting mode is the same as the refrigerant flow direction in the cooling mode. However, the control logic for each component (e.g., rotational speed of the indoor fan, operating frequency of the compressor, etc.) of the multi-split air conditioning system in the defrost mode may be different from the control logic for each component in the cooling mode.
In some embodiments, the indoor fan is operated with low wind when the multi-split air conditioning system is in the defrost mode. Therefore, the indoor refrigeration is less in the defrosting mode, the influence of the defrosting mode on the room temperature is reduced, and the indoor comfort is improved.
Fig. 9 illustrates a control method of the multi-split air conditioning system, which is used to switch the operation modes of the multi-split air conditioning system 100 among a heating mode, a heating defrost mode, and a defrost mode.
Referring to fig. 9, when the multi-split air conditioning system is in a heating mode, it is detected whether an outdoor unit of the multi-split air conditioning system satisfies a heating defrost function on condition.
If the outdoor unit of the multi-split air conditioning system meets the heating and defrosting function starting conditions, judging whether the ratio between the total capacity of the indoor units in a heating state and the capacity of the outdoor unit is smaller than or equal to a preset ratio.
If the ratio of the total capacity of the indoor unit in the heating state to the capacity of the outdoor unit is smaller than or equal to a preset ratio, controlling the air conditioning system to enter a heating defrosting mode; or if the ratio of the total capacity of the indoor unit in the heating state to the capacity of the outdoor unit is larger than the preset ratio, controlling the air conditioning system to enter a defrosting mode.
Judging whether an outdoor unit of the multi-split air conditioning system meets a defrosting function exit condition, and if so, switching an operation mode of the multi-split air conditioning system into a heating mode; or if the operation duration of the air conditioning system in the defrosting mode or the heating defrosting mode exceeds the preset duration, switching the operation mode of the multi-split air conditioning system into the heating mode.
It should be understood that when the air conditioning system is in the heating mode, the outdoor heat exchanger of the air conditioning system is prone to frosting, so that whether the outdoor unit of the multi-split air conditioning system meets the starting condition of the heating defrosting function is detected, if so, because the indoor unit in the shutdown state is the indoor unit which is stopped after reaching the preset temperature, according to the shutdown condition of the indoor unit, the indoor unit in the shutdown state is matched with the refrigerant circulation when the outdoor unit is defrosted, and the indoor unit in the heating state is heated through the bypass branch, so that the influence of the defrosting process on the room temperature is reduced. Further, after the outdoor unit meets the defrosting function exit condition, the air conditioning system is switched to a heating mode, and each indoor unit continues to heat normally.
In some embodiments, the multi-split air conditioning system further has a liquid storage function.
Optionally, in a case where the multi-split air conditioning system is in the cooling mode or the heating mode, the controller of the multi-split air conditioning system may be further configured to: under the condition that the multi-split air conditioning system is in a refrigerating mode or a heating mode, judging whether the liquid storage function starting condition is met or not, wherein the liquid storage function starting condition comprises the following steps: in the refrigeration mode, the ratio between the total capacity of the indoor units in the refrigeration state and the capacity of the outdoor units is smaller than or equal to a preset ratio, the exhaust pressure value of the compressor is larger than a preset pressure value, and the difference between the return air temperature and the air outlet temperature of the indoor units in the refrigeration state is smaller than a preset temperature difference; or in the heating mode, the ratio between the total capacity of the indoor unit in the heating state and the capacity of the outdoor unit is smaller than or equal to a preset ratio, the exhaust pressure value of the compressor is larger than a preset pressure value, and the difference between the air outlet temperature and the air return temperature of the indoor unit in the heating state is smaller than a preset temperature difference; when the target indoor unit meets the starting condition of the liquid storage function, the outdoor electromagnetic valve in the outdoor unit is controlled to be opened.
It should be understood that, when the multi-split air conditioning system is in the refrigeration mode, if the exhaust pressure value of the compressor is greater than the preset pressure value and the difference between the return air temperature and the outlet air temperature of the indoor unit is less than the preset temperature difference, this indicates that the refrigerant in the air conditioning system does not perform sufficient heat exchange at this time, the air pressure near the condenser is increased, and the air conditioning system operates under a small load. At this time, the circulating refrigerant amount required by the multi-split air conditioning system is relatively small. Considering that the refrigerant amount of the multi-split air conditioning system is relatively more, the unit operation frequency is low, and the refrigerating or heating effect is poor. Similarly, if the multi-split air conditioning system is in the heating mode and the exhaust pressure value of the compressor is larger than the preset pressure value and the difference between the air outlet temperature and the return air temperature of the indoor unit is smaller than the preset temperature difference, the air conditioning system is also in the small-load operation. In this case, a cooling or heating liquid storage mode may be activated, storing excess refrigerant in the hot gas bypass loop. After the outdoor solenoid valve is opened, part of refrigerant output by the compressor enters a pipeline between the outdoor solenoid valve and the bypass branch solenoid valve after passing through the four-way valve, so that part of refrigerant is stored, the load of the compressor is reduced, and the refrigerating or heating effect is improved.
Furthermore, the embodiment of the application provides corresponding hardware structures and/or software modules for executing the functions. Those of skill in the art will readily appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The embodiment of the application can divide the functional modules of the controller according to the method example, for example, each functional module can be divided corresponding to each function, and two or more functions can be integrated in one processing module. The integrated modules may be implemented in hardware or in software functional modules. Optionally, the division of the modules in the embodiment of the present application is schematic, which is merely a logic function division, and other division manners may be implemented in practice.
The embodiment of the present application further provides a schematic hardware structure of a controller, as shown in fig. 10, where the controller 2000 includes a processor 2001, and optionally, a memory 2002 and a communication interface 2003 connected to the processor 2001. The processor 2001, memory 2002 and communication interface 2003 are connected by a bus 2004.
The processor 2001 may be a central processing unit (central processing unit, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD), or any combination thereof. The processor 2001 may also be any other device with processing functionality, such as a circuit, a device or a software module. The processor 2001 may also include multiple CPUs, and the processor 2001 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).
Memory 2002 may be a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that may store information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc read-only memory (compact disc read-only memory) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, as embodiments of the application are not limited in this regard. The memory 2002 may be provided separately or may be integrated with the processor 2001. Wherein the memory 2002 may include computer program code. The processor 2001 is configured to execute computer program code stored in the memory 2002, thereby implementing the control method provided by the embodiment of the present application.
The communication interface 2003 may be used to communicate with other devices or communication networks (e.g., ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN), etc. the communication interface 2003 may be a module, circuit, transceiver, or any means capable of enabling communications.
Bus 2004 may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus, among others. The bus 2004 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 10, but not only one bus or one type of bus.
Embodiments of the present invention also provide a computer-readable storage medium including computer-executable instructions that, when executed on a computer, cause the computer to perform a method as provided in the above embodiments.
The embodiment of the present invention also provides a computer program product, which can be directly loaded into a memory and contains software codes, and the computer program product can implement the method provided by the above embodiment after being loaded and executed by a computer.
Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, these functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
From the foregoing description of the embodiments, it will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of functional modules is illustrated, and in practical application, the above-described functional allocation may be implemented by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to implement all or part of the functions described above.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and the division of modules or units, for example, is merely a logical function division, and other manners of division are possible when actually implemented. For example, multiple modules or components may be combined or may be integrated into another device, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms. The modules illustrated as separate components may or may not be physically separate, and the components shown as modules may be one physical module or multiple physical modules, i.e., may be located in one place, or may be distributed across multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units. The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions for causing a device (may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.
The foregoing is merely illustrative of specific embodiments of the present application, and the scope of the present application is not limited thereto, but any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (13)

1. A multi-split air conditioning system, comprising:
the outdoor unit comprises an outdoor heat exchanger, a compressor, a four-way valve, a bypass stop valve, an outdoor electromagnetic valve and an outdoor throttling device;
the indoor unit comprises a plurality of indoor units connected in parallel, and each indoor unit comprises an indoor heat exchanger, an indoor expansion valve, a bypass branch electromagnetic valve and a circulation branch electromagnetic valve;
the compressor, the four-way valve, the outdoor heat exchanger and the indoor expansion valve, the indoor heat exchanger and the circulation branch electromagnetic valve in each indoor unit are sequentially connected through pipelines to form a refrigerant circulation loop;
the exhaust port of the compressor in the outdoor unit, the outdoor throttling device, the outdoor electromagnetic valve, the bypass stop valve, the bypass branch electromagnetic valve in each indoor unit and the indoor heat exchanger are sequentially connected through pipelines to form a refrigerant bypass branch;
wherein, the multi-split air conditioning system is in a refrigeration drying mode or a heating defrosting mode: for the outdoor unit, an outdoor electromagnetic valve is opened, and an outdoor heat exchanger works as a condenser; for the first type indoor units in the indoor unit, a bypass branch electromagnetic valve is opened, a circulation branch electromagnetic valve is closed, and the indoor heat exchanger works as a condenser; for the second type indoor units in the indoor unit, the bypass branch electromagnetic valve is closed, the circulation branch electromagnetic valve is opened, and the indoor heat exchanger works as an evaporator;
A controller configured to:
acquiring the running state of each indoor unit under the condition that the multi-split air conditioning system is in a refrigerating mode;
if part of the indoor units are in the shutdown state, judging whether the indoor units in the shutdown state exist or not, wherein the indoor units meet the starting condition of the drying function;
if the indoor unit is in the shutdown state and meets the starting condition of the drying function, the indoor unit in the refrigeration state is used as the first type indoor unit, the indoor unit in the refrigeration state is used as the second type indoor unit, and the multi-split air conditioning system is controlled to operate in a refrigeration drying mode.
2. The multi-split air conditioning system of claim 1, wherein the drying function start condition includes: the temperature of the refrigerant liquid pipe of the indoor unit is smaller than the difference between the dew point temperature of the environment where the indoor unit is positioned and the first temperature compensation value within the first preset time.
3. The multi-split air conditioning system according to claim 1 or 2, wherein each of the indoor units further comprises: an indoor fan;
the controller is further configured to:
when the multi-split air conditioning system is in a refrigeration and drying mode, controlling the indoor fans of the first type indoor units to run according to a first air quantity;
After the air volume adjustment condition is met, controlling the indoor fan of the first type indoor unit to operate according to a second air volume, wherein the second air volume is larger than the first air volume, and the air volume adjustment condition comprises: the temperature of the refrigerant liquid pipe of the first type indoor unit is larger than the sum of the dew point temperature of the environment where the first type indoor unit is positioned and a second temperature compensation value within a second preset time period;
and after a third preset time period passes, controlling the indoor fans of the first type indoor units to stop running.
4. The multi-split air-conditioning system according to claim 1 or 2, wherein,
the controller is further configured to:
setting the opening degree of an indoor expansion valve of the first type indoor unit as an initial opening degree;
and adjusting the opening degree of the indoor expansion valve of the first type indoor unit according to the temperature of the refrigerant liquid pipe of the first type indoor unit so that the temperature of the refrigerant liquid pipe of the first type indoor unit is greater than or equal to the dew point temperature of the environment where the first type indoor unit is positioned.
5. The multi-split air-conditioning system of claim 4, wherein,
the controller is configured to adjust the opening of the indoor expansion valve according to the temperature of the refrigerant liquid pipe of the first type indoor unit, and specifically performs the following steps:
Determining a first opening change value according to the opening of the indoor expansion valve of the first type indoor unit in the n-1 th adjustment period;
determining a second opening degree change value according to the refrigerant liquid pipe temperature of the first type indoor unit in the nth adjusting period, the dew point temperature of the environment of the first type indoor unit in the nth adjusting period, the refrigerant liquid pipe temperature of the first type indoor unit in the (n-1) th adjusting period and the dew point temperature of the environment of the first type indoor unit in the (n-1) th adjusting period;
and determining the opening degree of the indoor expansion valve of the first type indoor unit in the nth adjusting period according to the opening degree of the indoor expansion valve of the first type indoor unit, the first opening degree change value and the second opening degree change value in the nth-1 adjusting period.
6. The multi-split air-conditioning system according to claim 1 or 2, wherein,
the controller is further configured to:
judging whether the first type indoor unit meets a drying function exit condition or not;
and when the first type indoor unit meets the exit condition of the drying function, controlling a bypass branch electromagnetic valve in the first type indoor unit to be closed.
7. The multi-split air conditioning system of claim 6, wherein the dry function exit condition comprises: the temperature of the refrigerant liquid pipe of the indoor unit is larger than or equal to the sum of the dew point temperature of the environment where the indoor unit is positioned and a third temperature compensation value within a third preset time period.
8. The multi-split air conditioning system of claim 1, further comprising a controller;
the controller is configured to:
judging whether the outdoor unit meets a defrosting function starting condition or not under the condition that the multi-split air conditioning system is in a heating mode;
when the outdoor unit meets a defrosting starting condition, judging whether the ratio between the total capacity of the indoor unit in a heating state and the capacity of the outdoor unit is smaller than or equal to a preset ratio;
if yes, the indoor unit in the heating state is used as the first type indoor unit, the indoor unit in the stopping state is used as the second type indoor unit, and the multi-split air conditioning system is controlled to operate in a heating defrosting mode.
9. The multi-split air conditioning system of claim 8, wherein the defrost function start condition includes a refrigerant liquid pipe temperature of the outdoor unit being less than or equal to a difference between an outdoor ambient temperature and a fourth temperature compensation value for a fourth preset period of time.
10. The multi-split air conditioning system of claim 8 or 9, wherein,
the controller is further configured to:
after the multi-split air conditioning system starts to operate in a heating defrosting mode, judging whether the outdoor unit meets a defrosting function exit condition or not;
if the outdoor unit meets the defrosting function exit condition, controlling the multi-split air conditioning system to operate in a heating mode;
and if the outdoor unit does not meet the defrosting function exit condition, controlling the multi-split air conditioning system to operate in a heating mode when the duration of operating in heating and defrosting of the multi-split air conditioning system reaches a fifth preset duration.
11. The multi-split air conditioning system of claim 10, wherein the defrost function exit condition includes a refrigerant liquid line temperature of the outdoor unit being greater than a sum of an outdoor ambient temperature and a fifth temperature compensation value for a sixth preset period of time.
12. The multi-split air conditioning system of claim 1, wherein the controller is configured to:
judging whether a liquid storage function starting condition is met or not under the condition that the multi-split air conditioning system is in a refrigerating mode or a heating mode, wherein the liquid storage function starting condition comprises the following steps: in the refrigeration mode, the ratio between the total capacity of the indoor unit in the refrigeration state and the capacity of the outdoor unit is smaller than or equal to a preset ratio, the exhaust pressure value of the compressor is larger than a preset pressure value, and the difference between the return air temperature and the air outlet temperature of the indoor unit in the refrigeration state is smaller than a preset temperature difference; or in the heating mode, the ratio between the total capacity of the indoor unit in the heating state and the capacity of the outdoor unit is smaller than or equal to a preset ratio, the exhaust pressure value of the compressor is larger than a preset pressure value, and the difference between the air outlet temperature and the air return temperature of the indoor unit in the heating state is smaller than a preset temperature difference;
And when the target indoor unit meets the starting condition of the liquid storage function, controlling an outdoor electromagnetic valve in the outdoor unit to be opened.
13. A control method applicable to the multi-split air conditioning system according to any one of claims 1 to 12, characterized in that the method comprises:
controlling the multi-split air conditioning system to operate in a refrigeration drying mode or a heating defrosting mode;
when the multi-split air conditioning system operates in a refrigerating drying mode or a heating defrosting mode:
for an outdoor unit in the multi-split air conditioning system, an outdoor electromagnetic valve is opened, and an outdoor heat exchanger works as a condenser;
for a first type indoor unit in the multi-split air conditioning system, a bypass branch electromagnetic valve is opened, a circulation branch electromagnetic valve is closed, and an indoor heat exchanger works as a condenser;
and for the second type indoor unit in the multi-split air conditioning system, the bypass branch electromagnetic valve is closed, the circulation branch electromagnetic valve is opened, and the indoor heat exchanger works as an evaporator.
CN202210491978.7A 2022-05-05 2022-05-05 Multi-split air conditioning system and control method thereof Active CN114857662B (en)

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Publication number Priority date Publication date Assignee Title
CN115264923B (en) * 2022-08-09 2024-05-10 宁波奥克斯电气股份有限公司 Multi-split control method and multi-split system

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07234038A (en) * 1994-02-18 1995-09-05 Sanyo Electric Co Ltd Multiroom type cooling-heating equipment and operating method thereof
JP2003028525A (en) * 2001-07-19 2003-01-29 Fujitsu General Ltd Multiroom type air conditioner
CN1477344A (en) * 2002-08-22 2004-02-25 Lg������ʽ���� Multiunit air conditioner and method for controlling outdoor fan operation
CN1609527A (en) * 2003-10-21 2005-04-27 三星电子株式会社 Air conditioner and method for controlling the same
CN102042648A (en) * 2010-11-29 2011-05-04 青岛海信日立空调***有限公司 Heat recovery type multi-connection air condition unit
CN103123147A (en) * 2013-03-27 2013-05-29 宁波奥克斯空调有限公司 Variable refrigerant flow air conditioning system and control method thereof
CN103292511A (en) * 2012-03-01 2013-09-11 富士通将军股份有限公司 Air conditioner
CN104456731A (en) * 2014-11-21 2015-03-25 特灵空调***(中国)有限公司 Multi-split air conditioner
CN106152312A (en) * 2014-09-18 2016-11-23 富士通将军股份有限公司 The off-premises station of conditioner and conditioner
CN110030757A (en) * 2019-03-26 2019-07-19 青岛海尔空调电子有限公司 Multi-gang air-conditioner and its control method
CN113154522A (en) * 2021-04-25 2021-07-23 珠海格力电器股份有限公司 Multi-connected air conditioner system and defrosting control method
CN113983586A (en) * 2021-11-17 2022-01-28 北京市京科伦冷冻设备有限公司 Multi-split central air-conditioning system capable of simultaneously refrigerating and heating
CN114322351A (en) * 2021-12-20 2022-04-12 珠海格力电器股份有限公司 Double-bypass air conditioning system, defrosting control method and air conditioner

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2564363B (en) * 2016-05-31 2021-03-17 Mitsubishi Electric Corp Air-conditioning apparatus

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07234038A (en) * 1994-02-18 1995-09-05 Sanyo Electric Co Ltd Multiroom type cooling-heating equipment and operating method thereof
JP2003028525A (en) * 2001-07-19 2003-01-29 Fujitsu General Ltd Multiroom type air conditioner
CN1477344A (en) * 2002-08-22 2004-02-25 Lg������ʽ���� Multiunit air conditioner and method for controlling outdoor fan operation
CN1609527A (en) * 2003-10-21 2005-04-27 三星电子株式会社 Air conditioner and method for controlling the same
CN102042648A (en) * 2010-11-29 2011-05-04 青岛海信日立空调***有限公司 Heat recovery type multi-connection air condition unit
CN103292511A (en) * 2012-03-01 2013-09-11 富士通将军股份有限公司 Air conditioner
CN103123147A (en) * 2013-03-27 2013-05-29 宁波奥克斯空调有限公司 Variable refrigerant flow air conditioning system and control method thereof
CN106152312A (en) * 2014-09-18 2016-11-23 富士通将军股份有限公司 The off-premises station of conditioner and conditioner
CN104456731A (en) * 2014-11-21 2015-03-25 特灵空调***(中国)有限公司 Multi-split air conditioner
CN110030757A (en) * 2019-03-26 2019-07-19 青岛海尔空调电子有限公司 Multi-gang air-conditioner and its control method
CN113154522A (en) * 2021-04-25 2021-07-23 珠海格力电器股份有限公司 Multi-connected air conditioner system and defrosting control method
CN113983586A (en) * 2021-11-17 2022-01-28 北京市京科伦冷冻设备有限公司 Multi-split central air-conditioning system capable of simultaneously refrigerating and heating
CN114322351A (en) * 2021-12-20 2022-04-12 珠海格力电器股份有限公司 Double-bypass air conditioning system, defrosting control method and air conditioner

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