CN114857662A - 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
CN114857662A
CN114857662A CN202210491978.7A CN202210491978A CN114857662A CN 114857662 A CN114857662 A CN 114857662A CN 202210491978 A CN202210491978 A CN 202210491978A CN 114857662 A CN114857662 A CN 114857662A
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China
Prior art keywords
indoor unit
conditioning system
indoor
outdoor
split air
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CN202210491978.7A
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CN114857662B (en
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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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    • 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, relates 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. This multi-split air conditioning system includes: 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, wherein each indoor unit comprises an indoor heat exchanger, an indoor expansion valve, a bypass branch electromagnetic valve and a circulation branch electromagnetic valve; a compressor, a four-way valve and an outdoor heat exchanger in the outdoor unit are connected with an indoor expansion valve, an indoor heat exchanger and a circulation branch electromagnetic valve in each indoor unit through pipelines to form a refrigerant circulation loop; an exhaust port of a compressor in the outdoor unit, an outdoor throttling device, an outdoor electromagnetic valve and a bypass stop valve are connected with a bypass branch electromagnetic valve and an indoor heat exchanger in each indoor unit 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 economic society, air conditioners are increasingly widely used in various places such as entertainment, home and work. When a plurality of small areas in the same area need to use air conditioners, a multi-split air conditioning system is often adopted to regulate and control the room temperature of multiple areas in consideration of saving of electric energy. However, in the use process of the multi-split air conditioning system, during refrigeration, condensation water is easily generated on the surface of an indoor heat exchanger of the multi-split air conditioning system, 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 condensed water disc 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 condensed water disc reaches a certain amount, a gravity valve arranged at the bottom of the condensed water disc is opened to drain water to a chassis; like this, although can play certain condensed water function of getting rid of, because the condensed water dish just discharges water after ponding reaches a certain amount, consequently still can remain moisture, and then breed the bacterium, can't thoroughly get rid of the condensed 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 operates 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; a compressor, a four-way valve and an outdoor heat exchanger in the outdoor unit, and an indoor expansion valve, an indoor heat exchanger and a bypass 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 and the bypass stop valve are sequentially connected with the circulation branch electromagnetic valve and the indoor heat exchanger in each indoor unit 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, and the indoor unit can be flexibly switched between the evaporator and the condenser. Therefore, when in the cooling mode, if the indoor unit has the problem of condensed water, the indoor unit can be switched from the evaporator to the condenser, so that the condensed 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, the outdoor electromagnetic valve is opened, and the outdoor heat exchanger works as a condenser; for a first type of indoor unit in the indoor unit, a bypass branch electromagnetic valve is opened, a circulation branch electromagnetic valve is closed, and an indoor heat exchanger works as a condenser; for a second type of 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, the first type indoor unit can be used as a condenser for heating in a refrigeration drying mode, 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. When the first type indoor unit removes the condensed water, the second type indoor unit works as an evaporator to perform normal refrigeration, and the refrigeration experience of a user is not influenced. In the heating and 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 to normally heat so as to ensure the 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 the normal defrosting.
In some embodiments, the multi-split air conditioning system further includes a controller; the controller is configured to: under the condition that the multi-split air conditioning system is in a refrigeration mode, acquiring the running state of each indoor unit; if part of the indoor units are in a shutdown state, judging whether the indoor units meeting the starting condition of the drying function exist in the indoor units in the shutdown state; and if the air conditioner type is in the shutdown state, the indoor unit meeting the drying function starting condition is used as a first type indoor unit, the indoor unit in the current refrigeration state is used as a second type indoor unit, and the multi-split air conditioning system is controlled to operate in a refrigeration and drying mode.
It should be understood that, when the indoor unit in the shutdown state reaches the preset refrigeration temperature, that is, completes the refrigeration process, the possibility of the condensed water adhering to the surface of the indoor heat exchanger is high, and therefore, whether an indoor unit meeting the starting condition of the drying function exists in the indoor units in the shutdown state is further judged, and the indoor unit in the shutdown state and meeting the starting condition of the drying function is taken as a first type indoor unit, that is, taken as a condenser, so that the condensed water on the surface of the indoor heat exchanger of the indoor unit is evaporated, and the drying function is realized. And the room controlled by the indoor unit in the refrigeration state at present still does not reach the preset temperature, so that the indoor unit in the refrigeration state works as the second type indoor unit, the indoor unit in the refrigeration state at present is enabled to refrigerate normally, and the refrigeration experience of a user is not influenced.
In some embodiments, the drying function starting conditions of the multi-split air conditioning system include: the temperature of a refrigerant liquid pipe of the indoor unit is less than the difference between the dew point temperature of the environment where the indoor unit is located and the first temperature compensation value within a first preset time period.
It should be understood that if the temperature of the refrigerant liquid pipe of the indoor unit is lower than the ambient dew point temperature, condensation water is generated on the surface of the indoor heat exchanger of the indoor unit. In order to further improve the accuracy of judging the condensed water, a first temperature compensation value is added for correction, and if the temperature of a refrigerant liquid pipe of the indoor unit is less than the difference between the ambient dew point temperature and the first temperature compensation value, the heat exchanger of the indoor unit is wet to generate the condensed water. Considering that a detection error exists in single measurement, if the measurement is continuously carried out within a first preset time period, and if the temperature of the indoor unit constantly meets the condition that the temperature of the refrigerant liquid pipe is less 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 wet, the starting condition of the drying function is met, and the indoor unit is further 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 of indoor unit to operate according to a first air volume; after the air volume adjusting condition is met, controlling an 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 a refrigerant liquid pipe of the first type indoor unit is greater than the sum of the dew point temperature of the environment where the first type indoor unit is located and a second temperature compensation value within a second preset time period; and after the third preset time period, controlling the indoor fan of the first type indoor unit to stop running.
It should be understood that when the multi-split air conditioning system is in the cooling and drying mode, the first type of indoor unit operates as a condenser and is in the heating mode. In this case, the air near the heat exchanger of the first type indoor unit is heated by the first low air flow rate, and then kept near the indoor heat exchanger, so that heat is accumulated, and the condensed water on the surface of the heat exchanger of the first type indoor unit can be evaporated more quickly. Further, if the temperature of the refrigerant liquid pipe of the first type indoor unit is detected to be greater 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 a second preset time period, the indoor heat exchanger of the indoor unit indicates that the surface is dry and the condensed water is evaporated. Therefore, after the air volume adjusting condition is met, the operation of the indoor fan is controlled by a second air volume which is larger, 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 a first type indoor unit as an initial opening degree; and adjusting the opening degree of an indoor expansion valve of the first type indoor unit according to the temperature of a 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 located.
It should be understood that the opening degree of the indoor expansion valve is adjusted 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 tends to be higher than the ambient dew point temperature of the indoor unit along with the adjustment of the electronic expansion valve, and therefore 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 an opening degree of the indoor expansion valve according to a temperature of a refrigerant liquid pipe of the first type indoor unit, and specifically performs the following steps: determining a first opening degree change value according to the opening degree of an indoor expansion valve of the first type indoor unit in the (n-1) th adjusting period; determining a second opening 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 where the first type indoor unit is located 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 where the first type indoor unit is located in the nth-1 adjusting period; and determining the opening degree of the indoor expansion valve of the first type indoor unit in the nth regulation 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 in the nth-1 regulation period.
In some embodiments, the controller of the multi-split air conditioning system is further configured to: judging whether the first type of indoor unit meets a drying function exit condition or not; and when the first type of indoor unit meets the exit condition of the drying function, controlling a bypass branch electromagnetic valve in the first type of indoor unit to be closed.
Therefore, the electromagnetic valve of the bypass branch is closed in time after the first type of indoor unit meets the exit condition of the drying function, so that the refrigerant which is conveyed to the indoor unit through the bypass branch is transferred to other indoor units, and the refrigerating effect is improved.
In some embodiments, the above-described drying function exit condition comprises: the temperature of a 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 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 relatively dry, and therefore the bypass solenoid valve of the indoor unit is closed to terminate the refrigerant flow of the bypass branch of the indoor unit. In consideration of the error of single measurement, the temperature of the refrigerant liquid pipe can be continuously detected for multiple times within the third preset time period, so that 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 heating mode, judging whether an outdoor unit meets the starting condition of a defrosting function; when the outdoor unit meets the defrosting starting condition, judging whether the ratio of the total capacity of the indoor unit in a heating state to the capacity of the outdoor unit is smaller than or equal to a preset ratio or not; and if so, taking the indoor unit which is currently in a heating state as a first type indoor unit, taking the indoor unit which is currently in a shutdown state as a second type indoor unit, and controlling the multi-split air-conditioning system to operate in a heating and defrosting mode.
It should be understood that if the outdoor unit meets the starting condition of the defrosting function, the multi-split air conditioning system can be switched to the heating defrosting mode to complete defrosting. The indoor unit in the shutdown state is used as a second type of indoor unit, that is, as an evaporator to cooperate with the refrigerant circulation when the outdoor unit is used as a condenser. The indoor unit in the heating state is used as a first type indoor unit, namely, the indoor unit is used as a condenser to operate and continue heating, so that the heating experience of a user is guaranteed.
In some embodiments, the defrost function start condition includes that the temperature of the refrigerant liquid pipe of the outdoor unit is less than or equal to the difference between the outdoor environment temperature and the fourth temperature compensation value within a fourth preset time period.
It should be understood that when the outdoor unit liquid pipe temperature is less than or equal to the difference between the outdoor environment temperature and the fourth temperature compensation value, the surface of the heat exchanger of the outdoor unit is frosted, and in consideration of the error of the single detection temperature, it is determined whether the refrigerant liquid pipe temperature of the outdoor unit is always less than or equal to the difference between the outdoor environment temperature and the fourth temperature compensation value within the fourth preset time period, so as to improve the detection accuracy.
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 a heating defrosting mode, judging whether the outdoor unit meets a defrosting function exit condition; if the outdoor unit meets the condition of quitting the defrosting function, controlling the multi-connected air conditioning system to operate in a heating mode; and if the outdoor unit does not meet the condition for quitting the defrosting function, controlling the multi-split air-conditioning system to operate in the heating mode when the operation heating defrosting time of the multi-split air-conditioning system reaches a fifth preset time.
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 conditioning system is switched to a heating mode, and the indoor temperature is increased. In addition, if the outdoor unit does not meet the condition for completing the exit of the defrosting function, but the operation heating defrosting mode reaches the fifth preset time, the indoor unit in the shutdown state in the air conditioning system is already cooled for a long time, the outdoor unit is already partially defrosted, and in order to ensure the comfort of the indoor temperature, the whole multi-split air conditioning system is switched into the heating mode to stop the cooling of the indoor unit in the defrosting mode, so that the indoor temperature is improved.
In some embodiments, the defrost function exit condition includes a refrigerant pipe temperature of the outdoor unit being greater than a sum of the outdoor ambient temperature and the fifth temperature compensation value for a sixth predetermined period of time.
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 environment 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 the heating mode to normally heat the air conditioning system. In consideration of the error of single measurement, the temperature of the refrigerant liquid pipe of the outdoor unit can be continuously detected for multiple times within the sixth preset time period, so that 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 multi-split air conditioning system is in the mode of refrigeration or the mode of heating, judge whether satisfy stock solution function start condition, stock solution function start condition includes: in the refrigeration mode, the ratio of the total capacity of the indoor unit in the refrigeration state to 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 value between the return air temperature and the outlet air temperature of the indoor unit in the refrigeration state is smaller than a preset temperature difference value; or in the heating mode, 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, the exhaust pressure value of the compressor is larger than a preset pressure value, and the difference value between the outlet air temperature and the return air temperature of the indoor unit in the heating state is smaller than a preset temperature difference value; and when the target indoor unit meets the starting condition of the liquid storage function, controlling the opening of an outdoor electromagnetic valve in the outdoor unit.
It should be understood that, when the multi-split air conditioning system is in the cooling mode, if the discharge 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 value, it is indicated 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 amount of the circulating refrigerant required by the multi-split air conditioning system is relatively small. Considering that the multi-split air conditioning system generally fills a relatively large amount of refrigerant, the unit operation frequency is low, and the cooling or heating effect is poor. Similarly, when the multi-split air conditioning system is in the heating mode, if the exhaust pressure value of the compressor is greater than the preset pressure value and the difference between the outlet air temperature and the return air temperature of the indoor unit is less than the preset temperature difference value, it is indicated that the air conditioning system is also in low-load operation at this time. In this case, the cooling or heating liquid storage mode may be activated to store excess refrigerant in the hot gas bypass circuit. After the outdoor electromagnetic valve is opened, part of refrigerant output by the compressor enters a pipeline between the outdoor electromagnetic valve and the bypass branch electromagnetic valve after passing through the four-way valve, and then part of refrigerant is stored, so that 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 method for controlling a multi-split air conditioning system, including: controlling the multi-split air conditioning system to operate in a refrigeration drying mode or a heating defrosting mode; wherein, 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 of 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 serves as a condenser to work; for a second type of 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 drying mode or a heating defrosting mode includes: under the condition that the multi-split air conditioning system is in a refrigeration mode, acquiring the running state of each indoor unit; if part of the indoor units are in a shutdown state, judging whether the indoor units meeting the starting condition of the drying function exist in the indoor units in the shutdown state; and if the air conditioner type is in the shutdown state, the indoor unit meeting the drying function starting condition is used as a first type indoor unit, the indoor unit in the current refrigeration state is used as a second type indoor unit, and the multi-split air conditioning system is controlled to operate in a refrigeration and drying mode.
In some embodiments, the drying function starting conditions of the multi-split air conditioning system include: the temperature of a refrigerant liquid pipe of the indoor unit is less than the difference between the dew point temperature of the environment where the indoor unit is located and the first temperature compensation value within a first preset time period.
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 of indoor unit to operate according to a first air volume; after the air volume adjusting condition is met, controlling an 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 a refrigerant liquid pipe of the first type indoor unit is greater than the sum of the dew point temperature of the environment where the first type indoor unit is located and a second temperature compensation value within a second preset time period; and after the third preset time period, controlling the indoor fan of the first type indoor unit to stop running.
In some embodiments, the above method further comprises: setting the opening degree of an indoor expansion valve of a first type indoor unit as an initial opening degree; and adjusting the opening degree of an indoor expansion valve of the first type indoor unit according to the temperature of a 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 located.
In some embodiments, the 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 includes: determining a first opening degree change value of an nth regulation period according to the opening degree of an indoor expansion valve of a first type indoor unit of the nth-1 regulation period; determining a second opening change value of the nth regulation period according to the refrigerant liquid pipe temperature of the first type indoor unit in the nth regulation period, the dew point temperature of the environment where the first type indoor unit is located in the nth regulation period, the refrigerant liquid pipe temperature of the first type indoor unit in the nth-1 regulation period and the dew point temperature of the environment where the first type indoor unit is located in the nth-1 regulation period; and determining the opening degree of the indoor expansion valve of the first type indoor unit in the nth regulation period according to the opening degree of the indoor expansion valve of the first type indoor unit in the (n-1) th regulation period, the first opening degree change value in the nth regulation period and the second opening degree change value in the nth regulation period.
In some embodiments, the above method further comprises: judging whether the first type of indoor unit meets a drying function exit condition or not; and when the first type of indoor unit meets the exit condition of the drying function, controlling a bypass branch electromagnetic valve in the first type of indoor unit to be closed.
In some embodiments, the above-described drying function exit condition comprises: the temperature of a 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 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 drying mode or a heating defrosting mode includes: under the condition that the multi-split air-conditioning system is in a heating mode, judging whether an outdoor unit meets the starting condition of a defrosting function; when the outdoor unit meets the defrosting starting condition, judging whether the ratio of the total capacity of the indoor unit in a heating state to the capacity of the outdoor unit is smaller than or equal to a preset ratio or not; and if so, taking the indoor unit which is currently in a heating state as a first type indoor unit, taking the indoor unit which is currently in a shutdown state as a second type indoor unit, and controlling the multi-split air-conditioning system to operate in a heating and defrosting mode.
In some embodiments, the defrost function start condition includes that the temperature of the refrigerant liquid pipe of the outdoor unit is less than or equal to the difference between the outdoor environment temperature and the 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 a heating defrosting mode, judging whether the outdoor unit meets a defrosting function exit condition; if the outdoor unit meets the condition for quitting the defrosting function, controlling the multi-split air-conditioning system to operate in a heating mode; and if the outdoor unit does not meet the condition for quitting the defrosting function, controlling the multi-split air-conditioning system to operate in the heating mode when the operation heating defrosting time of the multi-split air-conditioning system reaches a fifth preset time.
In some embodiments, the defrost function exit condition includes a refrigerant pipe temperature of the outdoor unit being greater than a sum of the outdoor ambient temperature and the fifth temperature compensation value for a sixth predetermined period of time.
In some embodiments, the above method further comprises: under the condition that multi-split air conditioning system is in the mode of refrigeration or the mode of heating, judge whether satisfy stock solution function start condition, stock solution function start condition includes: in the refrigeration mode, the ratio of the total capacity of the indoor unit in the refrigeration state to 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 value between the return air temperature and the outlet air temperature of the indoor unit in the refrigeration state is smaller than a preset temperature difference value; or in the heating mode, 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, the exhaust pressure value of the compressor is larger than a preset pressure value, and the difference value between the outlet air temperature and the return air temperature of the indoor unit in the heating state is smaller than a preset temperature difference value; and when the target indoor unit meets the starting condition of the liquid storage function, controlling the opening of an outdoor electromagnetic valve in the outdoor unit.
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 for storing computer program code comprising computer instructions which, 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 including computer instructions that, when executed on a computer, cause the computer to perform the method provided in the second aspect and possible implementation manners.
In a fifth aspect, embodiments of the present application provide a computer program product containing computer instructions, which when executed on a computer, cause the computer to perform the method provided in the second aspect and possible implementation manners.
It should be noted that all or part of the computer instructions may be stored on the computer readable storage medium. The computer readable storage medium may be packaged with or separately from a processor of the controller, which is not limited in this application.
The beneficial effects described in the second aspect to the fifth aspect in the present application may refer to the beneficial effect analysis of the first aspect, and are not described herein again.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic structural view of a multi-split air conditioning system according to some embodiments;
fig. 2 is a first schematic diagram illustrating a refrigerant cycle principle of a multi-split air conditioning system according to some embodiments;
fig. 3 is a second schematic diagram illustrating a refrigerant cycle principle of another multi-split air conditioning system according to some embodiments;
fig. 4 is a schematic view illustrating a method of controlling indoor fans of a multi-split air conditioning system according to some embodiments;
fig. 5 is a schematic view illustrating a control method of an indoor expansion valve of a multi-split air conditioning system according to some embodiments;
fig. 6 is a third schematic diagram illustrating a refrigerant cycle principle of another multi-split air conditioning system according to some embodiments;
fig. 7 is a first diagram illustrating a control method of a multi-split air conditioning system according to some embodiments;
fig. 8 is a fourth schematic diagram illustrating a refrigerant cycle principle of another multi-split air conditioning system according to some embodiments;
FIG. 9 is a second schematic diagram illustrating another control method for a multi-split air conditioning system according to some embodiments;
fig. 10 is a hardware configuration diagram of a controller according to some embodiments.
Reference numerals: 100-a multi-split air conditioning system; 200-an outdoor unit; 201-outdoor heat exchanger; 202-a compressor; 203-four-way valve; 204-a bypass stop valve; 205-outdoor electromagnetic valve; 206-outdoor throttling device; 207-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 branch solenoid valve; 304A-a first circulation branch solenoid valve; 305A-first indoor liquid pipe 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 branch solenoid valve; 304B-a second circulation branch solenoid valve; 305B-a second indoor liquid pipe temperature sensor; 306B-a second indoor fan; 300C-a third indoor unit; 301C-third indoor heat exchanger; 302C-third indoor expansion valve; 303C-a third bypass branch solenoid valve; 304C-third circulation branch solenoid valve; 305C-third chamber liquid tube temperature sensor; 306C-third indoor fan.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art. In addition, when a pipeline is described, the terms "connected" and "connected" are used in this application to have a meaning of conducting. The specific meaning is to be understood in conjunction with the context.
Unless the context requires otherwise, throughout the description and the claims, the term "comprise" and its other forms, such as the third person's singular form "comprising" and the present participle form "comprising" are to be interpreted in an open, inclusive sense, i.e. as "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "example", "specific example" or "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 are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be included in any suitable manner in any one or more embodiments or examples.
In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "such as" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
As described in the background art, when the multi-split air conditioning system performs refrigeration, condensed water is easily generated on the surface of the indoor heat exchanger, and the condensed water can cause bacteria to grow on the surface of the heat exchanger and generate peculiar smell. In order to solve such a problem, in the related art, a condensate tray is provided at an end device of the multi-split air conditioning system, and when a certain amount of condensate in the condensate tray is reached, a gravity valve provided at the bottom of the condensate tray is opened to drain water to a base pan. Therefore, although the function of removing the condensed water to a certain extent can be achieved, the condensed water tray drains water after accumulated water reaches a certain amount, so that water still remains, bacteria are bred, and peculiar smell cannot be eradicated.
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, all indoor units of the whole multi-split air conditioning system are switched to be in refrigerating operation and the outdoor unit is in heating operation in the related technology, so that the frost of the outdoor unit is melted; in this way, although a certain defrosting effect can be achieved, all indoor units can cool under the condition of heating, the room temperature is reduced, and the heating effect of the air conditioning system is reduced.
To this, this application embodiment provides a multi-split air conditioning system, this system all is provided with refrigerant bypass branch road by each indoor set, when the heat exchanger of certain indoor set needs to get rid of the condensate water, can communicate the refrigerant bypass branch road of this indoor set alone for this indoor set switches into the mode of heating, with getting rid of the condensate water, simultaneously, when this indoor set got rid of the condensate water, other indoor sets still normally refrigerate, do not influence user's refrigeration and experience.
In addition, when the multi-split air-conditioning system is in a heating mode, if the heat exchanger of the outdoor unit needs to be defrosted, the multi-split air-conditioning system can be switched to the cooling mode, so that the defrosting purpose is realized. And after the multi-split air conditioning system is switched to the cooling mode, the refrigerant bypass branch of the heat exchanger of the indoor unit needing heating can be communicated, so that the indoor unit is switched to the heating mode, and the use of a user is not influenced.
To further describe the solution 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, the multi-split air conditioning system 100 further 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 cut-off valve 204, an outdoor electromagnetic valve 205, and an outdoor throttling 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 fluid 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-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 branch solenoid valve 303C, and a third circulation branch solenoid valve 304C. In some embodiments, the first indoor unit 300C further includes a third indoor-duct 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 solenoid valve in each indoor unit are connected in sequence through pipes to form a refrigerant circulation loop.
In some embodiments, the discharge port of the compressor 202 in the outdoor unit 200, the outdoor throttling device 206, the outdoor solenoid valve 205, and the bypass stop valve 204, and the bypass solenoid valve and the indoor heat exchanger in each indoor unit are connected in sequence through pipes to form a refrigerant bypass branch.
The number of the indoor units is only 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 the installation of the respective components of the outdoor unit 200 will be described in detail.
In some embodiments, outdoor heat exchanger 201 is coupled to compressor 202 at one end via four-way valve 203 and coupled to an indoor heat exchanger at the other end. The outdoor heat exchanger 201 exchanges heat between the refrigerant flowing through the heat transfer tubes of the outdoor heat exchanger 201 and the outdoor air.
In some embodiments, the compressor 202 is disposed between the indoor heat exchanger and the outdoor heat exchanger 201 for providing power for the refrigerant cycle. Taking a refrigeration cycle as an example, the compressor 202 sends a compressed refrigerant to the outdoor heat exchanger 201 via the four-way valve 203. Alternatively, the compressor 202 may be a variable capacity inverter compressor 202 that is 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 discharge port of the compressor 202, the outdoor heat exchanger 201, the suction port of the compressor 202, and the indoor heat exchanger of each indoor unit. The four-way valve 203 is used for realizing the interconversion between the cooling mode and the heating mode by changing the flow direction of the refrigerant in the system pipeline.
In some embodiments, a bypass cut-off valve 204 is disposed between the four-way valve 203 and the indoor heat exchanger of each indoor unit, and the bypass cut-off valve 204 is kept in a normally open state after the installation of the multi-split air conditioning system is completed.
In some embodiments, the outdoor solenoid valve 205 is disposed on the refrigerant bypass branch between the four-way valve 203 and each indoor heat exchanger, and is used for controlling the connection and disconnection of the refrigerant bypass branch.
In some embodiments, the outdoor throttling 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 from the compressor discharge port. Illustratively, the outdoor throttle 206 may include an electronic expansion valve and/or a capillary tube. Alternatively, the outdoor throttle device 206 may be disposed between the outdoor solenoid valve 205 and the bypass cut-off valve 204. Alternatively, the outdoor throttle device 206 may be provided between the bypass cut-off valve 204 and each indoor unit. This is not limited by the present application.
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 through the heat transfer pipes 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 changing the rotation speed of the outdoor fan.
In some embodiments, the outdoor unit 200 further includes a high pressure switch (not shown), and the high pressure switch is electrically connected to the controller, and is configured to monitor a pressure of the air conditioning pipeline, and send an abnormal message to the controller when the pipeline pressure of the multi-split air conditioning system 100 is abnormal, so that the controller controls the system to be shut down, and ensure normal operation of the multi-split air conditioning system 100.
The functions and the installation of the respective components of the indoor unit will be specifically described below by taking the first indoor unit 300A as an example.
In some embodiments, the first indoor heat exchanger 301A is configured to exchange heat between the refrigerant flowing through the heat transfer tubes 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 decompressing the refrigerant flowing through the electronic expansion valve, and may 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. If the opening degree of the electronic expansion valve is decreased, the flow path resistance of the refrigerant passing through the electronic expansion valve is increased. When the opening degree of the electronic expansion valve is increased, the flow path resistance of the refrigerant passing through the electronic expansion valve is decreased. In this way, even if the state of other components in the circuit does not change, the flow rate of the refrigerant flowing through the first indoor heat exchanger 301A or the outdoor heat exchanger 201 changes when the opening degree of the electronic expansion valve changes. It should be noted that the number of the electronic expansion valves shown in fig. 1 is merely an example, and the present application is not limited thereto.
In some embodiments, the first bypass solenoid valve 303A is disposed between the first indoor heat exchanger 301A and the four-way valve 203, and is used for controlling the communication and cut-off of the refrigerant bypass of a single indoor unit. It should be understood that the first bypass branch solenoid valve 303A may also be disposed between the bypass blocking valve 204 and the four-way valve 203, or between the first indoor heat exchanger 301A and the four-way valve 203, as long as it is disposed on the main branch of the bypass refrigerant branch of each indoor unit, which is not limited in this application.
In some embodiments, the first circulation branch solenoid valve 304A is disposed between the first indoor heat exchanger 301A and the four-way valve 203, and is used for controlling the connection and disconnection of the refrigerant circulation branches of the single indoor unit.
In some embodiments, a first indoor liquid pipe temperature sensor 301A is provided to 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 between the refrigerant flowing in the heat transfer pipes of the first indoor heat exchanger 301A and 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 rotation speed of the indoor fan.
In some embodiments, the first indoor unit 300A further includes a plurality of capillary tubes (not shown) for reducing the pressure of the refrigerant in the pipes, and for depressurizing the high-pressure refrigerant delivered from the condenser and delivering the depressurized 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 comprises a dew point meter (not shown) for detecting an ambient dew point temperature near 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. Alternatively, the 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, a display is connected to the controller, and a user can perform operations on the control panel through the display to set a program. Optionally, the display further includes a pressure sensor or a temperature sensor, and the display may transmit a user instruction to the control to implement a human-computer interaction function according to a gesture operation of the user, such as pressing a key or the like. 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 is not limiting, 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 may generate an operation control signal instructing the multi-split air conditioning system 100 to execute a control instruction according to the instruction operation code and the timing signal. For example, the controller may be a Central Processing Unit (CPU), a general purpose processor Network (NP), a Digital Signal Processor (DSP), a microprocessor, a microcontroller, a Programmable Logic Device (PLD), or any combination thereof. The controller may also be other devices with processing functions, such as a circuit, a device, or a software module, which is not limited in any way by the embodiments of the present application.
Although not shown in fig. 1, the multi-split air conditioning system 100 may further include a power supply device (e.g., 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 as to implement functions such as power consumption management of the multi-split air conditioning system 100 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-drying mode, a heating-defrosting mode, and a defrosting mode. The above operation modes are respectively described in detail with reference to the specification.
1. Refrigeration mode
When the multi-split air conditioning system is in a refrigeration mode, the indoor unit needing refrigeration can open the electromagnetic valve of the circulation branch and close the electromagnetic bypass of the bypass branch. In this way, the indoor unit requiring refrigeration can operate as an evaporator.
For example, referring to 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 cooling, the controller of the multi-split air conditioning system 100 controls the first circulation branch solenoid valve 304A, the second circulation branch solenoid valve 304B, and the third circulation branch solenoid valve 304C to be opened, controls the first bypass branch solenoid valve 303A, the second bypass branch solenoid valve 303B, and the third bypass branch solenoid valve 303C to be closed, controls the outdoor solenoid valve 205 to be closed, and controls the bypass stop 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 includes: (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 merely an example. In the cooling mode, each indoor unit of the multi-split air conditioning system may be in a cooling operation state (as shown in fig. 1), or only some indoor units may be in the cooling operation state. For example, the multi-split air conditioning system may only have some indoor units powered on for cooling. For another example, the indoor unit may enter a shutdown state after reaching a preset temperature.
2. Refrigeration drying mode
When the multi-split air conditioning system is in a refrigeration mode, because 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 condensed water can be generated on the surface. In this regard, when some indoor units need to clean condensed water, the multi-split air conditioning system may be switched from the cooling mode to the cooling and drying mode. When the multi-split air conditioning system is switched to a refrigeration drying mode, the outdoor electromagnetic valve is opened for the outdoor unit, the bypass branch electromagnetic valve is opened for a first type of indoor unit (namely, the indoor unit needing heating) in the indoor unit, the circulation branch electromagnetic valve is closed, and the indoor heat exchanger works as a condenser; for the second type of indoor unit (i.e. the indoor unit which does not need heating) in the indoor unit set, 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 first type indoor unit can be used as a condenser for heating in a refrigeration drying mode, 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 the condensed water, the second type indoor unit works as an evaporator, normal refrigeration is realized, and the refrigeration experience of a user is not influenced.
In some embodiments, the controller of the multi-split air conditioning system is configured to: under the condition that the multi-split air conditioning system is in a refrigeration mode, acquiring the running state of each indoor unit; if part of the indoor units are in the shutdown state, judging whether the indoor units meeting the starting condition of the drying function exist in the indoor units in the shutdown state; if the first type indoor unit is in the shutdown state, the indoor unit meeting the drying function starting condition is used as the first type indoor unit, the indoor unit in the current refrigerating state is used as the second type indoor unit, and the multi-split air-conditioning system is controlled to operate in the refrigerating and drying mode.
The shutdown state refers to a state of achieving a warm shutdown state of the multi-split air conditioning system, namely a state of stopping the operation of an air conditioner compressor after the indoor temperature reaches the set temperature of the air conditioner.
It should be understood that, when the indoor unit in the shutdown state reaches the cooling temperature to complete the cooling process, the possibility of the condensed water adhering to the surface of the indoor heat exchanger is high, and therefore, the indoor unit in the shutdown state and meeting the starting condition of the drying function is taken as the first type indoor unit, that is, the indoor unit is taken as a 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. And the room controlled by the indoor unit in the refrigeration state at present still does not reach the preset temperature, so that the indoor unit in the refrigeration state works as the second type indoor unit, the indoor unit in the refrigeration state at present is enabled to refrigerate normally, and the refrigeration experience of a user is not influenced.
In some embodiments, the drying function initiation conditions include: the temperature of a refrigerant liquid pipe of the indoor unit is less than the difference between the dew point temperature of the environment where the indoor unit is located and the first temperature compensation value within a first preset time period.
The dew point temperature is the temperature of air 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 the dew point temperature through a built-in dew point meter. Optionally, the controller of the multi-split air conditioning system acquires the dry bulb temperature of the indoor air through a built-in indoor temperature sensor, acquires 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 specific manner of obtaining the dew point temperature is not limited in this application.
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 means that the heat exchanger of the indoor unit is relatively wet and is prone to generate condensed water. Considering that a detection error exists in single measurement, if the indoor unit constantly meets the condition that the temperature of a refrigerant liquid pipe is less than the difference between the ambient dew point temperature and the first temperature compensation value within a first preset time period, the heat exchanger of the indoor unit is considered to be wet, the starting condition of the drying function is met, and the indoor unit is further dried.
To further explain the specific working conditions of each component of the multi-split air-conditioning system when the multi-split air-conditioning system is in the cooling and drying mode, as shown in fig. 3, the refrigerant circulation process of the multi-split air-conditioning system 100 is specifically explained below by taking as an example that the first indoor unit 300A and the second indoor unit 300B are in a cooling state, and the third indoor unit 300C is in a shutdown state and satisfies the drying function start condition.
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 branch solenoid valve 304A and the second circulation branch solenoid valve 304B to be opened, controls the third circulation branch solenoid valve 304C to be closed, controls the first bypass branch solenoid valve 303A and the second bypass branch solenoid valve 303B to be closed, controls the third bypass branch solenoid valve 303C to be opened, opens the outdoor solenoid valve 205, and opens the bypass cut-off valve 204. 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 includes: (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) → (20) → (21) → (22) → (23) → (15) → (9) → (6) → (7) or (8) → (18) → (19) → (1).
It can be seen that, at this time, the multi-split air conditioning system 100 is in the cooling and drying mode, wherein the first indoor unit 300A and the second indoor unit 300B operate as the second type indoor unit and are in the cooling operation state, and the third indoor unit 300C operates as the first type indoor unit and is in the drying mode. Like this, when making the heat exchanger at the third indoor set need get rid of the condensate water, communicate the refrigerant bypass branch road of the third indoor set alone for the third indoor set switches over into the heating mode, in order to get rid of the condensate water, simultaneously, when the third indoor set goes the condensate water, guarantees that first indoor set and second indoor set still normally refrigerate, does not influence user's refrigeration and experiences.
In some embodiments, as shown in fig. 4, when the multi-split air conditioning system is in the cooling and drying mode, the controller may be further configured to: controlling an indoor fan of a first type indoor unit to operate according to a first air volume; and 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 after the third preset time period, controlling the indoor fan of the first type indoor unit to stop running.
Optionally, the air volume adjusting condition includes: the temperature of the refrigerant liquid pipe of the first type indoor unit is greater than the sum of the dew point temperature of the environment where the first type indoor unit is located and a second temperature compensation value within a second preset time period.
It should be understood that when the multi-split air conditioning system is in the cooling and drying mode, the first type of indoor unit operates as a condenser and is in the heating mode. In this case, the air near the heat exchanger of the first type indoor unit is heated by the first low air flow rate, and then kept near the indoor heat exchanger, so that heat is accumulated, and the condensed water on the surface of the indoor heat exchanger of the first type indoor unit can be evaporated more quickly. And after the air volume 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 a second air volume larger than the first air volume so as to discharge the evaporated condensed water vapor out of the indoor unit. Further, after the indoor fan operates for a third preset time at the second air volume, the indoor fan is turned off. So that the first type indoor unit can not send hot air to the indoor space any more, and the comfort level of the environment temperature is improved.
In some embodiments, when the multi-split air conditioning system is in the cooling and drying function, the controller of the multi-split air conditioning system is configured to: and adjusting the opening degree of an indoor expansion valve of the first type indoor unit according to the temperature of a refrigerant liquid pipe of the first type indoor unit.
Optionally, the specific opening degree adjustment manner may be: and determining a first opening degree change value of the nth regulation period according to the opening degree of the indoor expansion valve of the first type indoor unit of the (n-1) th regulation period. And determining a second opening change value of the nth adjustment period according to the refrigerant liquid pipe temperature of the first type indoor unit in the nth adjustment period, the dew point temperature of the environment where the first type indoor unit is located in the nth adjustment period, the refrigerant liquid pipe temperature of the first type indoor unit in the nth-1 adjustment period and the dew point temperature of the environment where the first type indoor unit is located in the nth-1 adjustment period. And determining the opening degree of the indoor expansion valve of the first type indoor unit in the nth regulation period according to the opening degree of the indoor expansion valve of the first type indoor unit in the (n-1) th regulation period, the first opening degree change value and the second opening degree change value in the nth regulation period.
As a specific example, as shown in fig. 5, the adjusting of the opening degree of the indoor expansion valve according to the temperature of the refrigerant liquid pipe of the first type indoor unit may be implemented as the following steps:
sa1, the multi-split air conditioning system starts a refrigeration drying function.
Sa2 sets EVI (i, 0), which is the initial opening degree EVI (i, 0) of the indoor expansion valve of the ith first-type indoor unit, to 0, and sets the adjustment cycle of the indoor expansion valve to n, which is the initial value of n to 0.
Sa3, obtaining the opening EVI (i, n-1) of the indoor expansion valve of the first type indoor unit in the (n-1) th adjusting period.
Wherein n is a positive integer.
Sa41, determining the first opening variation value of the nth adjustment period as delta EVI according to the opening EVI (i, n-1) of the indoor expansion valve of the first type indoor unit in the nth-1 adjustment period 1 (i，n)＝M 3 *EVI(i，n-1)。
Wherein M is 3 Overshoot and undershoot control constants.
Sa42, determining a target temperature difference value delta T1(i, N) ═ T (i, N) -Tdew (i, N) + N, N at the nth adjustment period according to the refrigerant liquid pipe temperature T (i, N) at the nth adjustment period of the first type indoor unit and the dew point temperature Tdew (i, N) of the environment at the nth adjustment period, wherein N is a refrigerant liquid pipe target temperature correction coefficient; determining a target temperature difference delta T1(i, N-1) as T (i, N-1) -Tdew (i, N-1) + N in the (N-1) th adjusting period according to the temperature T (i, N-1) of a refrigerant liquid pipe in the (N-1) th adjusting period and the dew point temperature Tdew (i, N-1) of the environment in the (N-1) th adjusting period; determining the second opening degree change value as DeltaEVI 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 (n-1) th adjustment period 2 (i，n)＝M 1 *(△T1(i,n)-△T1(i,n-1))+M 2 *△T1(i,n)；M 1 、M 2 Are control constants.
Step Sa42 may be executed before step Sa41, after Sa41, or simultaneously with Sa41, which is not limited in the present application.
Sa5, first opening degree variation value delta EVI of first type indoor unit according to n-1 adjustment period 1 (i, n) and a second opening degree variation value DeltaEVI 2 (i, n), and determining the opening change value of the first type indoor unit in the nth regulation period as delta EVI (i, n) ═ delta EVI 1 (i，n)+△EVI 2 (i，n)。
Sa6, determining the opening degree of the indoor expansion valve of the first type indoor unit in the nth adjustment period as EVI (i, n) ═ EVI (i, n-1) + Δ EVI (i, n) according to the opening degree change value Δ EVI (i, n) and the opening degree EVI (i, n-1) of the indoor expansion valve 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 the above steps Sa3 to Sa6 until the air conditioning system exits the cooling and drying function.
It should be understood that when the liquid pipe temperature of the first type indoor unit is lower than the ambient dew point temperature, condensed water is generated, and the above steps Sa1 to Sa6 adjust the opening degree of the indoor expansion valve according to the refrigerant liquid pipe temperature of the first type indoor unit, so that the refrigerant liquid pipe temperature 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 further the condensed 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 of indoor unit meets a drying function exit condition or not; and when the first type of indoor unit meets the exit condition of the drying function, controlling a bypass branch electromagnetic valve in the first type of indoor unit to be closed. The indoor unit is closed in time after meeting the drying condition, so that the refrigerant which should pass through the indoor unit is transferred to other indoor units, and the refrigeration effect is improved.
Further, after the first type of indoor unit meets the exit condition of the drying function, the electromagnetic valve of the circulation branch of the first type of indoor unit can be opened, so that the indoor unit is converted into the second type of indoor unit, and then the indoor unit enters a refrigeration mode after the drying function is completed. It should be understood that the first type of indoor unit, when performing the drying function, actually operates as a condenser, with 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 be used as an evaporator to work for cooling, so that the comfort of a user is improved.
In some embodiments, the exiting 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 where 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 surface of the heat exchanger of the indoor unit is relatively dry, and therefore the bypass solenoid valve of the indoor unit is closed to stop the bypass refrigerant flow of the indoor unit. In consideration of the sensitivity of the sensor, whether the above condition is satisfied can be continuously detected for a plurality of times within a third preset time period, so that the detection reliability is improved.
3. Drying mode
When the multi-split air conditioning system is in a refrigeration mode, because 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 condensed water can be generated on the surface. In contrast, when all the indoor units need to clean condensed water, the multi-split air conditioning system may be switched from the cooling mode to the drying mode. When the multi-split air conditioning system is in the dry mode, the outdoor heat exchanger of the multi-split air conditioning system operates as an evaporator, and each of the indoor heat exchangers operates as a condenser.
Referring to the multi-split air conditioning system 100 shown in fig. 1, the controller of the multi-split air conditioning system 100 controls the first, second, and third circulation branch solenoid valves 304A, 304B, and 304C to be opened, controls the first, second, and third bypass branch solenoid valves 303A, 303B, and 303C to be closed, closes the outdoor solenoid valve 205, and closes the bypass shutoff valve 204. 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 includes: (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 the heat exchanger of each indoor unit operates as a condenser, thereby releasing heat and evaporating the condensed water on the surface of the indoor heat exchanger.
In some embodiments, when the multi-split air conditioning system is in the dry mode, the compressor of the multi-split air conditioning system operates at a low frequency, and the outdoor fan operates at a low wind.
It should be understood that in the drying mode, the outdoor temperature of the multi-split air conditioning system is high, so that the suction pressure of the outdoor unit is high, and the discharge pressure of the indoor unit is also high, so as to ensure the reliability of the air conditioning operation, and to control the low-frequency operation of the compressor of the air conditioning system. In addition, the fan runs at low wind, so that heating in the drying mode is less, the influence of the drying mode on the room temperature is reduced, and the indoor comfort is improved.
Fig. 7 illustrates a control method of a multi-split air conditioning system for switching an operation mode of the multi-split air conditioning system 100 between a cooling mode, a cooling-drying mode, and a drying mode.
Referring to fig. 7, when the multi-split air conditioning system is in the cooling mode, it is detected whether there is an indoor unit that is turned on but is in an off state in the multi-split air conditioning system.
And if so, detecting whether the indoor unit in the shutdown state meets the refrigeration and drying conditions.
And if the indoor units in the shutdown state meet the refrigeration and drying conditions, judging whether the started indoor units in the multi-split air-conditioning system are in the shutdown state or not.
If the started indoor units in the multi-split air-conditioning system are all in a shutdown 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 all the started indoor units in the multi-split air-conditioning system are not in the shutdown state, controlling the air-conditioning system to enter a refrigeration drying mode.
Judging whether an indoor unit of the multi-split air-conditioning system meets a drying function exit condition or not, and if so, switching the operation mode of the multi-split air-conditioning system to a refrigeration mode; or if the operation time of the air conditioning system in the drying mode or the refrigerating and drying mode exceeds the preset time, the operation mode of the multi-split air conditioning system is switched to the refrigerating mode.
It should be understood that when the air conditioning system is in the cooling mode, the indoor unit of the air conditioning system is prone to generate condensed water, so that whether each indoor unit of the multi-split air conditioning system meets the starting condition of the cooling and drying function is detected, if yes, the indoor unit in the shutdown state is the indoor unit which is shut down after reaching the preset temperature, and therefore the indoor unit in the shutdown state is enabled to complete drying according to the shutdown condition of the indoor unit, and the influence of the drying process on the room temperature is reduced. Further, after the condition that the drying function quits is met, the air conditioning system is switched to the refrigeration mode, and each indoor unit continues to perform normal refrigeration.
4. Heating mode
When the multi-split air-conditioning system is in the heating mode, the outdoor heat exchanger operates as an evaporator, the controller of the multi-split air-conditioning system 100 controls the first, second, and third circulation branch solenoid valves 304A, 304B, and 304C to be opened, controls the first, second, and third bypass branch solenoid valves 303A, 303B, and 303C to be closed, closes the outdoor solenoid valve 205, and closes the bypass stop valve 204. At this time, the refrigerant circulation direction is also shown by the arrow in fig. 6.
Still referring to fig. 6, the refrigerant circuit flowing through the first indoor unit 300A includes: (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 defrost mode
When the multi-split air conditioning system is in a heating mode, the outdoor heat exchanger works as an evaporator, so that the surface temperature of the outdoor heat exchanger is reduced, frost may be condensed on the surface of the outdoor heat exchanger, and the heat exchange effect is affected. In contrast, when the outdoor heat exchanger needs defrosting, the multi-split air conditioning system may be switched from the heating mode to the heating and 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 of indoor unit (namely, an indoor unit needing heating) in the indoor unit set, a bypass branch electromagnetic valve is opened, a circulation branch electromagnetic valve is closed, and an indoor heat exchanger serves as a condenser to work; for the second type of indoor unit (i.e. the indoor unit which does not need heating) in the indoor unit set, 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 the 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 to normally heat so as to ensure the heating experience of a user, and the indoor heat exchanger in the second type indoor unit is used as an evaporator to form a refrigerant loop with the first type indoor unit and form a refrigerant loop with 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: under the condition that the multi-split air-conditioning system is in a heating mode, judging whether an outdoor unit meets the starting condition of a defrosting function; when the outdoor unit meets the defrosting starting condition, judging whether the ratio of the total capacity of the indoor unit in a heating state to the capacity of the outdoor unit is smaller than or equal to a preset ratio or not; and if so, taking the indoor unit which is currently in a heating state as a first type indoor unit, taking the indoor unit which is currently in a shutdown state as a second type indoor unit, and controlling the multi-split air-conditioning system to operate in a heating and defrosting mode.
Wherein, the capacity refers to the refrigerating capacity. The shutdown state refers to a temperature-controlled shutdown state of the multi-split air conditioning system, that is, a state in which the air conditioner compressor stops operating after the indoor temperature reaches the set temperature of the air conditioner.
It should be understood that if the outdoor unit meets the starting condition of the defrosting function, the multi-split air conditioner can be switched to the heating defrosting mode to complete defrosting. The indoor unit in the shutdown state is used as a second type of indoor unit, that is, as an evaporator to cooperate with a refrigerant cycle when the outdoor unit is used as a condenser. The indoor unit in the heating state is used as a first type indoor unit and a condenser to operate, and heating is continued to ensure the heating experience of a user.
In some embodiments, the defrost function initiation condition includes a refrigerant tube temperature of the outdoor unit being less than or equal to a difference between the outdoor ambient temperature and the fourth temperature compensation value for a fourth predetermined 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 built in the outdoor unit. It should be understood that when the outdoor unit liquid pipe temperature is less than or equal to the difference between the outdoor environment temperature and the fourth temperature compensation value, the surface of the heat exchanger of the outdoor unit is frosted, and in consideration of the error of the single detection temperature, it is determined whether the refrigerant liquid pipe temperature of the outdoor unit is always less than or equal to the difference between the outdoor environment temperature and the fourth temperature compensation value within the fourth preset time period, so as to improve the detection accuracy.
To further explain the specific working conditions of each component of the multi-split air-conditioning system when the multi-split air-conditioning system is in the heating and defrosting mode, as shown in fig. 8, the refrigerant circulation process of the multi-split air-conditioning system 100 is specifically explained below by taking an example in which the outdoor unit satisfies 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.
When the multi-split air-conditioning system is in a heating and defrosting mode, the four-way valve of the multi-split air-conditioning system 100 is switched to a cooling mode, the outdoor heat exchanger 200 works as a condenser, the controller of the multi-split air-conditioning system 100 controls the first and second circulation branch electromagnetic valves 304A and 304B to be closed, the third circulation branch electromagnetic valve 304C to be opened, controls the first and second bypass branch electromagnetic valves 303A and 303B to be opened, closes the third bypass branch electromagnetic valve 303C, and opens the outdoor electromagnetic valve 205. 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 the heating and defrosting mode, in which the first indoor unit 300A and the second indoor unit 300B operate as the first type indoor unit and are in the heating operation state, and the third indoor unit 300C operates as the second type indoor unit and is in the defrosting mode. Therefore, when the outdoor unit needs defrosting, the third indoor unit 300C in the shutdown state cooperates with the outdoor unit 200 to form a refrigerant circulation loop, the first indoor unit 300A and the second indoor unit 300B in the heating state continue heating, and the first indoor unit and the second indoor unit can still normally heat while the outdoor unit is defrosting, so that the heating experience of a user is not influenced.
In some embodiments, after the multi-split air conditioning system starts to operate the heating and defrosting mode, whether the outdoor unit meets the defrosting function exit condition is judged; if the outdoor unit meets the condition for quitting the defrosting function, controlling the multi-split air-conditioning system to operate in a heating mode; and if the outdoor unit does not meet the condition for quitting the defrosting function, controlling the multi-split air-conditioning system to operate in the heating mode when the operation heating defrosting time of the multi-split air-conditioning system reaches a fifth preset time.
It should be understood that during heating and defrosting, the indoor unit in a shutdown state starts cooling to match the refrigerant cycle during defrosting of the outdoor unit. Therefore, when the outdoor unit meets the condition of quitting the defrosting function, the outdoor unit finishes defrosting, and at the moment, the multi-split system is switched to the heating mode to stop the indoor unit from refrigerating in the defrosting mode, so that the indoor temperature is increased. Or when the outdoor unit does not meet the condition for completing the exit of the defrosting function, but the continuous operation heating defrosting mode reaches the fifth preset time, the indoor unit in the shutdown state is cooled for a long time, the outdoor unit completes partial defrosting, and in order to ensure the comfort of the indoor temperature, the whole multi-split air-conditioning system is switched into the heating mode to stop the cooling of the indoor unit in the defrosting mode, so that the indoor temperature is improved.
Optionally, the defrosting function exit condition includes that the temperature of the refrigerant liquid pipe of the outdoor unit is greater than the sum of the outdoor environment temperature and the fifth temperature compensation value within a sixth preset time period. 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 environment 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 the heating mode to normally heat the air conditioning system. In consideration of the error of single measurement, the temperature of the refrigerant liquid pipe of the outdoor unit can be continuously detected for multiple times within the sixth preset time period, so that the detection reliability is improved.
6. Defrost mode
When the multi-split air conditioning system is in a heating mode, the outdoor heat exchanger works as an evaporator, so that the surface temperature of the outdoor heat exchanger is reduced, frost may be condensed on the surface of the outdoor heat exchanger, and the heat exchange effect is affected. In contrast, when the outdoor heat exchanger needs 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 branch solenoid valve 304A, the second circulation branch solenoid valve 304B, and the third circulation branch solenoid valve 304C to be opened, and controls the first bypass branch solenoid valve 303A, the second bypass branch solenoid valve 303B, and the third bypass branch solenoid valve 303C to be closed, the outdoor solenoid valve 205 to be closed, and the bypass cut-off 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, at this time, the first indoor unit 300A, the second indoor unit 300B, and the third indoor unit 300C are all in the cooling operation state, and the outdoor heat exchanger serves as a condenser, thereby releasing heat and melting and evaporating frost on the surface of the outdoor heat exchanger.
It should be understood that the refrigerant flow direction in the defrosting mode and the refrigerant flow direction in the heating mode of the multi-split air conditioning system are the same. However, the control logic of the multi-split air conditioning system for each component in the defrosting mode (e.g., the rotation speed of the indoor fan, the operating frequency of the compressor, etc.) may be different from the control logic for each component in the heating mode.
In some embodiments, when the multi-split air conditioning system is in the defrost mode, the indoor fan is operated with low wind. So that indoor refrigeration is less under 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 a multi-split air conditioning system for switching the operation modes of the multi-split air conditioning system 100 between the heating mode, the heating defrost mode, and the defrost mode.
Referring to fig. 9, when the multi-split air conditioning system is in the heating mode, it is detected whether an outdoor unit of the multi-split air conditioning system satisfies a heating defrost function activation condition.
And if the outdoor unit of the multi-split air-conditioning system meets the starting condition of the heating and defrosting functions, judging whether the ratio of the total capacity of the indoor units in the heating state to 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 units 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 units in the heating state to the capacity of the outdoor unit is greater than the preset ratio, controlling the air conditioning system to enter the defrosting mode.
Judging whether an outdoor unit of the multi-split air-conditioning system meets a defrosting function exit condition or not, and if the defrosting function exit condition is met, switching the operation mode of the multi-split air-conditioning system into a heating mode; or if the operation time of the air conditioning system in the defrosting operation mode or the heating defrosting operation mode exceeds the preset time, 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 and defrosting function is detected, if yes, the indoor unit in the shutdown state is the indoor unit which is shut down after reaching the preset temperature, so that the indoor unit in the shutdown state is matched with refrigerant circulation when the outdoor unit is defrosted according to the shutdown condition of the indoor unit, 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 condition of quitting the defrosting function, the air conditioning system is switched to the heating mode, and each indoor unit continues to normally heat.
In some embodiments, the multi-split air conditioning system further includes a liquid storage function.
Optionally, in a case where the multi-split air conditioning system is in a cooling mode or a heating mode, the controller of the multi-split air conditioning system may be further configured to: under the condition that multi-split air conditioning system is in the mode of refrigeration or the mode of heating, judge whether satisfy stock solution function start condition, stock solution function start condition includes: in the refrigeration mode, the ratio of the total capacity of the indoor unit in the refrigeration state to the capacity of the outdoor unit is smaller than or equal to a preset ratio, the discharge pressure value of the compressor is larger than a preset pressure value, and the difference value between the return air temperature and the outlet air temperature of the indoor unit in the refrigeration state is smaller than a preset temperature difference value; or in the heating mode, 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, the exhaust pressure value of the compressor is larger than a preset pressure value, and the difference value between the outlet air temperature and the return air temperature of the indoor unit in the heating state is smaller than a preset temperature difference value; and when the target indoor unit meets the starting condition of the liquid storage function, controlling the opening of an outdoor electromagnetic valve in the outdoor unit.
It should be understood that, when the multi-split air conditioning system is in the cooling mode, if the discharge 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 value, it is indicated 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 amount of the circulating refrigerant required by the multi-split air conditioning system is relatively small. Considering that the multi-split air conditioning system generally fills a relatively large amount of refrigerant, the unit operation frequency is low, and the cooling or heating effect is poor. Similarly, when the multi-split air conditioning system is in the heating mode, if the exhaust pressure value of the compressor is greater than the preset pressure value and the difference between the outlet air temperature and the return air temperature of the indoor unit is less than the preset temperature difference value, it is indicated that the air conditioning system is also in low-load operation at this time. In this case, the cooling or heating liquid storage mode may be activated to store excess refrigerant in the hot gas bypass circuit. After the outdoor electromagnetic valve is opened, part of refrigerant output by the compressor enters a pipeline between the outdoor electromagnetic valve and the bypass branch electromagnetic valve after passing through the four-way valve, and then part of refrigerant is stored, so that the load of the compressor is reduced, and the refrigerating or heating effect is improved.
In addition, the embodiment of the present application provides a hardware structure and/or a software module corresponding to each function. 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 performed as hardware or computer software drives 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 invention.
In the embodiment of the present application, the controller may be divided into the functional modules according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. Optionally, the division of the modules in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
The embodiment of the present application further provides a schematic diagram of a hardware structure of a controller, as shown in fig. 10, 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 (CPU), a general purpose processor Network (NP), a Digital Signal Processor (DSP), a microprocessor, a microcontroller, a Programmable Logic Device (PLD), or any combination thereof. The processor 2001 may also be any other means having a processing function such as a circuit, device or software module. The processor 2001 may also include a plurality of CPUs, and the processor 2001 may be one 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 that process data, such as 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 (RAM) or other type of dynamic storage device that may store information and instructions, but is not limited to, electrically erasable programmable read-only memory (EEPROM), compact disk read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, 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. The memory 2002 may be separate or integrated with the processor 2001. The memory 2002 may include, among other things, computer program code. The processor 2001 is configured to execute the computer program code stored in the memory 2002, thereby implementing the control method provided by the embodiment of the present application.
Communication interface 2003 may be used to communicate with other devices or communication networks (e.g., an Ethernet, Radio Access Network (RAN), Wireless Local Area Network (WLAN), etc.. communication interface 2003 may be a module, circuitry, transceiver, or any other device capable of communicating.
The bus 2004 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. 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 this is not intended to represent only one bus or type of bus.
Embodiments of the present invention also provide a computer-readable storage medium, where the computer-readable storage medium includes computer-executable instructions, and when the computer-executable instructions are executed on a computer, the computer is caused to execute the method provided in the foregoing embodiments.
The embodiment of the present invention further provides a computer program product, which can be directly loaded into the memory and contains software codes, and after being loaded and executed by the computer, the computer program product can implement the method provided by the above embodiment.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the 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.
Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical function division, and there may be other division ways in actual implementation. For example, multiple modules or components may be combined or may be integrated into another device, or some features may be omitted, or not implemented. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, indirect coupling or communication connection between devices or modules, and may be in an electrical, mechanical or other form. Modules described as separate components may or may not be physically separate, and components shown as modules may be one physical module or multiple physical modules, may be located in one place, or may be distributed in multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various media capable of storing program codes.
The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (15)

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;
a compressor, a four-way valve and an outdoor heat exchanger in the outdoor unit, and an indoor expansion valve, an indoor heat exchanger and a circulation branch electromagnetic valve in each indoor unit are sequentially connected through pipelines to form a refrigerant circulation loop;
and an exhaust port of a compressor in the outdoor unit, an outdoor throttling device, an outdoor electromagnetic valve and a bypass stop valve are sequentially connected with a bypass branch electromagnetic valve and an indoor heat exchanger in each indoor unit through pipelines to form a refrigerant bypass branch.
2. The multi-split air conditioning system as claimed in claim 1, wherein the multi-split air conditioning system is in a cooling 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 a first type of indoor unit in the indoor unit, a bypass branch electromagnetic valve is opened, a circulation branch electromagnetic valve is closed, and an indoor heat exchanger works as a condenser;
for a 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.
3. A multi-split air conditioning system as claimed in claim 2, further comprising a controller;
the controller configured to:
under the condition that the multi-split air conditioning system is in a refrigeration mode, acquiring the running state of each indoor unit;
if part of the indoor units are in a shutdown state, judging whether the indoor units meeting the starting condition of the drying function exist in the indoor units in the shutdown state;
and if the air conditioner type is the first type indoor unit, the indoor unit which is in a shutdown state and meets the starting condition of the drying function is taken as the first type indoor unit, the indoor unit which is in a refrigerating state at present is taken as the second type indoor unit, and the multi-split air conditioning system is controlled to operate in a refrigerating and drying mode.
4. The multi-split air conditioning system as claimed in claim 3, wherein the drying function starting condition includes: the temperature of a refrigerant liquid pipe of the indoor unit is less than the difference between the dew point temperature of the environment where the indoor unit is located and the first temperature compensation value within a first preset time period.
5. The multi-split air conditioning system as claimed in claim 3 or 4, wherein each of the indoor units further comprises: an indoor fan;
the controller further configured to:
when the multi-split air-conditioning system is in a refrigeration drying mode, controlling an indoor fan of the first type indoor unit to operate according to a first air volume;
controlling an indoor fan of the first type indoor unit to operate according to a second air volume after meeting an air volume adjusting condition, 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 a refrigerant liquid pipe of the first type indoor unit is greater than the sum of the dew point temperature of the environment where the first type indoor unit is located and a second temperature compensation value within a second preset time period;
and after a third preset time period, controlling the indoor fan of the first type indoor unit to stop running.
6. A multi-split air conditioning system as set forth in claim 3 or 4,
the controller 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 an indoor expansion valve of the first type indoor unit according to the temperature of a 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 located.
7. A multi-split air conditioning system as claimed in claim 6,
the controller is configured to adjust the opening degree of the indoor expansion valve according to the temperature of the refrigerant liquid pipe of the first type indoor unit, and specifically executes the following steps:
determining a first opening degree change value according to the opening degree of the indoor expansion valve of the first type indoor unit in the (n-1) th adjusting period;
determining a second opening 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 where the first type indoor unit is located 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 where the first type indoor unit is located in the nth-1 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 in the (n-1) th adjusting period, the first opening degree change value and the second opening degree change value.
8. A multi-split air conditioning system as set forth in claim 3 or 4,
the controller further configured to:
judging whether the first type of indoor unit meets a drying function exit condition or not;
and when the first type of indoor unit meets the condition of exiting the drying function, controlling a bypass branch electromagnetic valve in the first type of indoor unit to be closed.
9. The multi-split air conditioning system as claimed in claim 8, wherein the dry function exit condition includes: the temperature of a 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 a third temperature compensation value within a third preset time period.
10. A multi-split air conditioning system as claimed in claim 2, further comprising a controller;
the controller configured to:
under the condition that the multi-split air-conditioning system is in a heating mode, judging whether the outdoor unit meets the starting condition of a defrosting function;
when the outdoor unit meets the defrosting starting condition, judging whether the ratio of the total capacity of the indoor unit in a heating state to the capacity of the outdoor unit is smaller than or equal to a preset ratio or not;
and if so, taking the indoor unit which is currently in a heating state as the first type indoor unit, taking the indoor unit which is currently in a shutdown state as the second type indoor unit, and controlling the multi-split air-conditioning system to operate in a heating and defrosting mode.
11. The multi-split air conditioning system as claimed in claim 10, wherein the defrost function start condition includes that a refrigerant pipe temperature of the outdoor unit is less than or equal to a difference between an outdoor ambient temperature and a fourth temperature compensation value for a fourth preset time period.
12. A multi-split air conditioning system as set forth in claim 10 or 11,
the controller further configured to:
after the multi-split air-conditioning system starts to operate in a heating and defrosting mode, judging whether the outdoor unit meets a defrosting function exit condition;
if the outdoor unit meets the condition of quitting the defrosting function, controlling the multi-split air-conditioning system to operate in a heating mode;
and if the outdoor unit does not meet the condition for quitting the defrosting function, controlling the operation heating mode of the multi-split air-conditioning system when the operation heating defrosting time of the multi-split air-conditioning system reaches a fifth preset time.
13. The multi-split air conditioning system as claimed in claim 12, wherein the defrost function exit condition includes a refrigerant pipe 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 time period.
14. A multi-split air conditioning system as claimed in claim 1, further comprising a controller;
the controller configured to:
under the condition that the multi-split air conditioning system is in a refrigeration mode or a heating mode, whether a liquid storage function starting condition is met is judged, wherein the liquid storage function starting condition comprises the following steps: in a refrigeration mode, the ratio of the total capacity of the indoor unit in a refrigeration state to the capacity of the outdoor unit is smaller than or equal to a preset ratio, the discharge pressure value of the compressor is larger than a preset pressure value, and the difference value between the return air temperature and the outlet air temperature of the indoor unit in the refrigeration state is smaller than a preset temperature difference value; or in the heating mode, 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, the discharge pressure value of the compressor is larger than a preset pressure value, and the difference value between the outlet air temperature and the return air temperature of the indoor unit in the heating state is smaller than a preset temperature difference value;
and when the target indoor unit meets the starting condition of the liquid storage function, controlling the opening of an outdoor electromagnetic valve in the outdoor unit.
15. A control method applied to a multi-split air conditioning system as set forth in any one of claims 1 to 14, 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 runs 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 of 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 serves as a condenser to work;
for a second type of 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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