CN102927715B - Multiple-on-line heat pump air-conditioning system and method for controlling multiple-on-line heat pump air-conditioning system - Google Patents

Multiple-on-line heat pump air-conditioning system and method for controlling multiple-on-line heat pump air-conditioning system Download PDF

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Publication number
CN102927715B
CN102927715B CN201210427743.8A CN201210427743A CN102927715B CN 102927715 B CN102927715 B CN 102927715B CN 201210427743 A CN201210427743 A CN 201210427743A CN 102927715 B CN102927715 B CN 102927715B
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China
Prior art keywords
heat exchanger
valve
electronic expansion
expansion valve
unit
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CN102927715A (en
Inventor
刘敏
曹培春
李亚军
朱小磊
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Priority to CN201210427743.8A priority Critical patent/CN102927715B/en
Priority to EP12887504.4A priority patent/EP2916082B1/en
Priority to PCT/CN2012/083981 priority patent/WO2014067129A1/en
Publication of CN102927715A publication Critical patent/CN102927715A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/02—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing
    • F24F1/032—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing characterised by heat exchangers
    • 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
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0234—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in series arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor heat exchanger

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a multiple-on-line heat pump air-conditioning system and a method for controlling the multiple-on-line heat pump air-conditioning system. The method is that a confluence unit performs gas-liquid separation and compression to a refrigerant output by the third end of a changing-over unit and outputs the refrigerant to the first end of the changing-over unit; under the working conditions of refrigeration and cooling-free dehumidification, a refrigerant output by the second end of the changing-over unit is driven to flow through a first heat exchange unit, a second electronic expansion valve, a second heat exchanger, a third electronic expansion valve and a third heat exchanger, flows back to the fourth end of the changing-over unit through a first stop valve and then is output out of the third end; under a working condition of heating, a refrigerant output by the fourth end of the changing-over unit is driven to flow through the third heat exchanger, the third electronic expansion valve, the second heat exchanger and the second electronic expansion valve, flows back to the second end of the changing-over unit through a second stop valve and the first heat exchange unit and then is output from the third end. By applying the method, the system cost can be reduced, and the control accuracy of the multiple-on-line heat pump air-conditioning system can be improved.

Description

Multi-split heat pump air conditioning system and method for controlling same
Technical Field
The invention relates to a multi-split air conditioner control technology, in particular to a multi-split heat pump air conditioning system and a method for controlling the same.
Background
Along with the continuous improvement of people's standard of living, through installing air conditioning system under living and indoor operational environment for promote living and operational environment's travelling comfort, become an important selection that people improved the travelling comfort demand. The multi-split heat pump air conditioner technology is an important direction for development of the central air conditioner due to the advantages of free control, high efficiency, energy conservation, convenience in installation and maintenance and the like.
Fig. 1 is a schematic structural diagram of a conventional multi-split heat pump air conditioning system. Referring to fig. 1, the multi-split heat pump air conditioning system generally comprises one or more outdoor units 01, one or more indoor units 02, a central control network (CS-NET) 03, refrigerant pipelines 04, a branch pipe 05 and communication lines 06, wherein the outdoor units form an outdoor unit, the central control network controls the outdoor unit through the communication lines, the outdoor units are connected with the branch pipe through the refrigerant pipelines, and the branch pipe is connected with the indoor units. Wherein,
the outdoor unit generally comprises an outdoor heat exchanger, a compressor and other refrigeration accessories, wherein the outdoor heat exchanger generally adopts an air-cooled or water-cooled heat exchange mode; the indoor unit consists of a fan, a heat exchanger and the like, and generally adopts a direct evaporation heat exchange mode. Compared with a plurality of household air conditioners, the outdoor unit of the multi-split heat pump air conditioning system is shared, the equipment cost can be effectively reduced, the centralized management of each indoor unit can be realized, one indoor unit can be independently started to operate, and a plurality of indoor units can be simultaneously started to operate, so that the control is more flexible.
When an indoor unit of the multi-split heat pump air conditioning system is used for processing air, the temperature and the humidity of the air need to be adjusted and controlled, wherein the humidity control difficulty is higher. In the existing multi-split air-conditioning system, a cooling and dehumidifying method for controlling indoor humidity is adopted, however, by adopting the method, on one hand, the energy consumption of the multi-split air-conditioning system is high and the evaporation temperature is reduced due to excessively reducing the air supply temperature, and the energy efficiency ratio of the multi-split air-conditioning system is reduced due to the reduction of the evaporation temperature; on the other hand, the cooling and dehumidification are carried out in plum rain season, so that the cold blowing feeling of the supplied air is strong, and in order to avoid the discomfort caused by the strong cold blowing feeling to the user, an electric heating wire needs to be added to the indoor unit to heat the supplied air, so that the energy consumption of the multi-split heat pump air-conditioning system is further increased.
In order to avoid the technical problems of high system power consumption and low refrigeration performance when a multi-split heat pump air-conditioning system dehumidifies, the prior art provides an improved method, namely, a reheating heat exchanger is added to an indoor unit part of the multi-split heat pump air-conditioning system, the reheating heat exchanger is actually a condenser, high-temperature and high-pressure refrigerant flowing from an outdoor side heat exchanger flows through the reheating heat exchanger, so that heat is discharged into return air, the other part of the return air is cooled and dehumidified by an evaporator and then is mixed with the heated return air of the part of the return air and then is sent into a room, so that the non-cooling function is realized, or a special dehumidification electromagnetic valve is developed or a plurality of electromagnetic valves are added to realize the non-cooling function. However, this improved method requires an additional reheat heat exchanger in the indoor unit, which increases the system cost; on the other hand, a special dehumidification electromagnetic valve or a plurality of electromagnetic valves are adopted, so that the control difficulty of the multi-split heat pump air-conditioning system is increased, and the control precision is difficult to ensure.
Disclosure of Invention
The embodiment of the invention provides a multi-split heat pump air-conditioning system, which reduces the system cost and improves the control precision of the multi-split heat pump air-conditioning system.
The embodiment of the invention also provides a method for controlling the multi-split heat pump air-conditioning system, which reduces the system cost and improves the control precision of the multi-split heat pump air-conditioning system.
In order to achieve the above object, an embodiment of the present invention provides a multi-split heat pump air conditioning system, including: an outdoor unit and an indoor unit, wherein,
the outdoor unit includes: the heat exchanger comprises a control unit, a confluence unit, a switching unit and a first heat exchange unit;
the indoor unit includes: the indoor side fan, the second electronic expansion valve, the second heat exchanger, the third electronic expansion valve and the third heat exchanger;
the control unit is used for controlling a first heat exchanger in the first heat exchange unit to be a condenser and a second heat exchanger and a third heat exchanger in the indoor unit to be evaporators when the multi-split heat pump air-conditioning system is in a refrigeration working condition; when the multi-split heat pump air-conditioning system is in a heating working condition, controlling a first heat exchanger in a first heat exchange unit to be an evaporator, and controlling a second heat exchanger and a third heat exchanger in an indoor unit to be condensers; when the multi-split heat pump air-conditioning system is in a non-cooling dehumidification working condition, controlling a first heat exchanger in a first heat exchange unit and a second heat exchanger in an indoor unit to be condensers, and controlling a third heat exchanger in the indoor unit to be an evaporator;
the switching unit is used for controlling the first end of the switching unit to be communicated with the second end and the third end to be communicated with the fourth end when the multi-split heat pump air-conditioning system is in a refrigeration and non-cooling dehumidification working condition, the first end receives the output of the confluence unit and outputs the output to the first heat exchange unit from the second end, and the fourth end receives the output of the indoor unit and outputs the output to the confluence unit from the third end; when the multi-split heat pump air-conditioning system is in a heating working condition, the first end of the control switching unit is communicated with the fourth end, the second end of the control switching unit is communicated with the third end, the first end receives the output of the confluence unit and outputs the output to the first end of the indoor unit from the fourth end, the second end receives the output of the first heat exchange unit and outputs the output to the confluence unit from the third end;
the confluence unit is used for outputting the refrigerant output by the switching unit to the switching unit after gas-liquid separation and compression;
the first heat exchange unit is used for driving outdoor air to flow through a first heat exchanger in the first heat exchange unit, one end of the first heat exchange unit is connected with the second end of the switching unit, and the other end of the first heat exchange unit is connected with the second end of the indoor unit;
one end of the second electronic expansion valve is connected with the other end of the second stop valve, and the other end of the second electronic expansion valve is connected with one end of the second heat exchanger;
the other end of the second heat exchanger is connected with one end of a third electronic expansion valve;
the other end of the third electronic expansion valve is connected with one end of a third heat exchanger;
the other end of the third heat exchanger is connected with the other end of the first stop valve;
the indoor side fan is used for driving indoor return air to flow through the second heat exchanger and the third heat exchanger.
Preferably, the switching unit includes: a four-way reversing valve and a first stop valve, wherein,
the first end of the four-way reversing valve is connected with the output end of the confluence unit, the second end of the four-way reversing valve is connected with the input end of the first heat exchange unit, the third end of the four-way reversing valve is connected with the input end of the confluence unit, the fourth end of the four-way reversing valve is connected with one end of the first stop valve, and the other end of the first stop valve is connected with the first end of the indoor unit.
Preferably, the bus bar unit includes: a compressor, a one-way valve and a gas-liquid separator, wherein,
the output end of the compressor is connected with the input end of the one-way valve, the output end of the one-way valve is connected with the first end of the four-way reversing valve, the input end of the gas-liquid separator is connected with the third end of the four-way reversing valve, and the output end of the gas-liquid separator is connected with the input end of the compressor.
Preferably, the first heat exchange unit comprises: a first heat exchanger, an outdoor side fan, a first electronic expansion valve and a second stop valve,
one end of the first heat exchanger is connected with the second end of the four-way reversing valve, and the other end of the first heat exchanger is connected with one end of the first electronic expansion valve;
the other end of the first electronic expansion valve is connected with one end of the second stop valve;
the other end of the second stop valve is connected with the second end of the indoor unit;
the outdoor side fan is used for driving outdoor air to flow through the first heat exchanger.
Preferably, the compressor is composed of one or more constant speed compressors, or is composed of a variable speed compressor, or is composed of a combination of a constant speed compressor and a variable speed compressor.
Preferably, the first and second liquid crystal films are made of a polymer,
the outdoor side fan is an axial flow fan;
the indoor side fan is a centrifugal fan or a perfusion fan.
Preferably, the first heat exchanger, the second heat exchanger and the third heat exchanger are aluminum foil copper tube heat exchangers or aluminum fin type micro-channel heat exchangers.
Preferably, the second heat exchanger is located at an upper portion of the third heat exchanger.
Preferably, the indoor unit further includes: a first temperature sensor, a second temperature sensor, and a third temperature sensor, wherein,
the first temperature sensor is arranged on a refrigerant pipeline between the second electronic expansion valve and the second heat exchanger and close to one end of the second heat exchanger;
the second temperature sensor is arranged on the refrigerant pipeline between the third heat exchanger and the first stop valve and close to one end of the third heat exchanger;
and the third temperature sensor is arranged on the refrigerant pipeline between the third electronic expansion valve and the third heat exchanger and close to one end of the third heat exchanger.
Preferably, the refrigerant is discharged from the exhaust port of the compressor and enters the one-way valve, and the high-pressure refrigerant gas output by the one-way valve enters the first end of the four-way reversing valve;
when the multi-split heat pump air conditioning system is in a refrigeration and non-cooling dehumidification working condition:
the first end and the second end of the four-way reversing valve are communicated, the third end and the fourth end of the four-way reversing valve are communicated, and refrigerant sequentially flows through the second end of the four-way reversing valve, the first heat exchanger, the first electronic expansion valve, the second stop valve, the second electronic expansion valve, the third heat exchanger, the first stop valve and the fourth end of the four-way reversing valve and then flows through the gas-liquid separator from the third end of the four-way reversing valve to enter an air suction port of the compressor;
when the multi-split heat pump air conditioning system is in a heating working condition:
the first end and the fourth end of the four-way reversing valve are communicated, the second end and the third end of the four-way reversing valve are communicated, and the refrigerant flows through the fourth end of the four-way reversing valve, the first stop valve, the third heat exchanger, the third electronic expansion valve, the second heat exchanger, the second electronic expansion valve, the second stop valve, the first electronic expansion valve, the first heat exchanger and the second end of the four-way reversing valve in sequence and then flows through the gas-liquid separator from the third end of the four-way reversing valve to enter the air suction port of the compressor.
Preferably, the first and second liquid crystal films are made of a polymer,
under the working condition of refrigeration, the first electronic expansion valve and the third electronic expansion valve are fully opened, the second electronic expansion valve is throttled, the first heat exchanger is a condenser, the second heat exchanger and the third heat exchanger are evaporators, low-temperature air sent out by an indoor unit is used for indoor refrigeration, and the valve opening degree of the second electronic expansion valve is controlled by the difference value of the temperatures collected by the second temperature sensor and the first temperature sensor;
under the working condition of no temperature reduction and dehumidification, the first electronic expansion valve and the second electronic expansion valve are fully opened, the third electronic expansion valve is used for throttling, the first heat exchanger and the second heat exchanger are both condensers, the third heat exchanger is an evaporator, one part of return air flowing through the indoor unit is heated by the second heat exchanger to be hot air, the other part of return air is dehumidified and cooled by the third heat exchanger, and processed cold air and the hot air are mixed and then are sent into the indoor unit; the valve opening degree of the third electronic expansion valve is controlled by the difference value of the temperatures acquired by the second temperature sensor and the third temperature sensor;
under the heating condition, the third electronic expansion valve is fully opened, the first electronic expansion valve and the second electronic expansion valve are used for throttling, the first heat exchanger is an evaporator, the second heat exchanger and the third heat exchanger are condensers, and high-temperature air sent by the indoor unit is used for indoor heating; the valve opening degree of the second electronic expansion valve is controlled by the difference value of the condensation temperature of the high-pressure refrigerant and the temperature collected by the first temperature sensor.
Preferably, the indoor unit further includes: a fourth heat exchanger and a fifth heat exchanger, wherein,
the second heat exchanger and the third heat exchanger form a group of heat exchangers, the fourth heat exchanger and the fifth heat exchanger form another group of heat exchangers, and the two groups of heat exchangers are connected through sheet metal parts to form a V-shaped heat exchanger.
Preferably, the other end of the second heat exchanger is connected with one end of a fourth heat exchanger;
the other end of the fourth heat exchanger is connected with one end of a third electronic expansion valve;
the other end of the third electronic expansion valve is connected with one end of a third heat exchanger;
the other end of the third heat exchanger is connected with one end of the fifth heat exchanger;
the other end of the fifth heat exchanger is connected with the other end of the first stop valve, and the second temperature sensor is arranged on a refrigerant pipeline which is arranged between the fifth heat exchanger and the first stop valve and is close to one end of the fifth heat exchanger.
Preferably, under the working condition of no cooling and dehumidification, the refrigerant flows through the second electronic expansion valve, the second heat exchanger, the fourth heat exchanger, the third electronic expansion valve, the third heat exchanger and the fifth heat exchanger in sequence, the second electronic expansion valve is fully opened, the third electronic expansion valve is throttled, the second heat exchanger and the fourth heat exchanger are both condensers, the third heat exchanger and the fifth heat exchanger are both evaporators, hot air flows out of the second heat exchanger, cold air flows out of the third heat exchanger, hot air flows out of the fourth heat exchanger, cold air flows out of the fifth heat exchanger, and the hot air and the cold air are mixed to form air supply.
Preferably, the third electronic expansion valve is a thermostatic expansion valve and a solenoid valve connected in parallel, and a bulb of the thermostatic expansion valve is arranged on the refrigerant pipeline between the first stop valve and the third heat exchanger and near one end of the third heat exchanger, wherein,
when the electromagnetic valve is opened, the electromagnetic valve is fully opened corresponding to the third electronic expansion valve; when the electromagnetic valve is closed and the thermal expansion valve is adjusted, the throttle adjustment is carried out corresponding to the third electronic expansion valve, and the valve opening degree of the thermal expansion valve is controlled by the temperature measured by the temperature sensing bulb.
A method of controlling a multi-split heat pump air conditioning system, the method comprising:
a, a converging unit of the outdoor unit receives the refrigerant output by the third end of the switching unit, performs gas-liquid separation and compression on the refrigerant, and outputs the refrigerant to the first end of the switching unit;
judging the working condition of the multi-split heat pump air-conditioning system:
b, if the indoor unit is in a refrigeration and non-cooling dehumidification working condition, driving the refrigerant output by the second end of the switching unit, which is connected with the first end, to sequentially flow through the first heat exchange unit, the second electronic expansion valve, the second heat exchanger, the third electronic expansion valve and the third heat exchanger of the indoor unit, flow back to the fourth end of the switching unit through the first stop valve in the switching unit, and then output from the third end of the switching unit;
and C, if the indoor unit is in a heating working condition, driving the refrigerant output by the fourth end of the switching unit, which is connected with the first end, to sequentially flow through the third heat exchanger, the third electronic expansion valve, the second heat exchanger and the second electronic expansion valve of the indoor unit, flow back to the second end of the switching unit through the second stop valve of the outdoor unit and the first heat exchange unit, and then output from the third end of the switching unit.
Wherein,
the switching unit includes: a four-way reversing valve and a first stop valve, wherein,
the first end of the four-way reversing valve is connected with the output end of the confluence unit, the second end of the four-way reversing valve is connected with the input end of the first heat exchange unit, the third end of the four-way reversing valve is connected with the input end of the confluence unit, the fourth end of the four-way reversing valve is connected with one end of the first stop valve, and the other end of the first stop valve is connected with the first end of the indoor unit;
the bus bar unit includes: a compressor, a one-way valve and a gas-liquid separator, wherein,
the output end of the compressor is connected with the input end of the one-way valve, the output end of the one-way valve is connected with the first end of the four-way reversing valve, the input end of the gas-liquid separator is connected with the third end of the four-way reversing valve, and the output end of the gas-liquid separator is connected with the input end of the compressor;
the first heat exchange unit comprises: a first heat exchanger, an outdoor side fan, a first electronic expansion valve and a second stop valve,
one end of the first heat exchanger is connected with the second end of the four-way reversing valve, and the other end of the first heat exchanger is connected with one end of the first electronic expansion valve;
the other end of the first electronic expansion valve is connected with one end of the second stop valve;
the other end of the second stop valve is connected with the second end of the indoor unit;
the outdoor side fan is used for driving outdoor air to flow through the first heat exchanger;
the indoor unit further includes: and an indoor side fan for driving the indoor return air to flow through the second heat exchanger and the third heat exchanger.
Wherein the step B comprises:
the first end and the second end of the four-way reversing valve are communicated, the third end and the fourth end of the four-way reversing valve are communicated, and refrigerant sequentially flows through the second end of the four-way reversing valve, the first heat exchanger, the first electronic expansion valve, the second stop valve, the second electronic expansion valve, the third heat exchanger, the first stop valve and the fourth end of the four-way reversing valve and then flows through the gas-liquid separator from the third end of the four-way reversing valve to enter an air suction port of the compressor;
under the refrigeration working condition, the first electronic expansion valve and the third electronic expansion valve are fully opened, the second electronic expansion valve is throttled, the first heat exchanger is a condenser, the second heat exchanger and the third heat exchanger are evaporators, low-temperature air sent out by an indoor unit is used for indoor refrigeration, and the valve opening degree of the second electronic expansion valve is controlled by the difference value of the temperatures collected by the second temperature sensor and the first temperature sensor;
under the working condition of no temperature reduction and dehumidification, the first electronic expansion valve and the second electronic expansion valve are fully opened, the third electronic expansion valve is used for throttling, the first heat exchanger and the second heat exchanger are both condensers, the third heat exchanger is an evaporator, one part of return air flowing through the indoor unit is heated by the second heat exchanger to be hot air, the other part of return air is dehumidified and cooled by the third heat exchanger, and processed cold air and the hot air are mixed and then are sent into the indoor unit; the valve opening degree of the third electronic expansion valve is controlled by the difference value of the temperatures collected by the second temperature sensor and the third temperature sensor.
Wherein the step C comprises:
the first end and the fourth end of the four-way reversing valve are communicated, the second end and the third end of the four-way reversing valve are communicated, and the refrigerant sequentially flows through the fourth end of the four-way reversing valve, the first stop valve, the third heat exchanger, the third electronic expansion valve, the second heat exchanger, the second electronic expansion valve, the second stop valve, the first electronic expansion valve, the first heat exchanger and the second end of the four-way reversing valve, then flows through the gas-liquid separator from the third end of the four-way reversing valve and enters the air suction port of the compressor;
the first heat exchanger is an evaporator, the second heat exchanger and the third heat exchanger are condensers, and high-temperature air sent by the indoor unit is used for indoor heating; the valve opening degree of the second electronic expansion valve is controlled by the difference value of the condensation temperature of the high-pressure refrigerant and the temperature collected by the first temperature sensor.
In the multi-split heat pump air-conditioning system and the method for controlling the same, provided by the embodiment of the invention, the converging unit of the outdoor unit receives the refrigerant output by the third end of the switching unit, and outputs the refrigerant to the first end of the switching unit after gas-liquid separation and compression; judging the working condition of the multi-split heat pump air-conditioning system: if the indoor unit is in a refrigeration and non-cooling dehumidification working condition, the refrigerant output by the second end connected with the first end of the switching unit is driven to sequentially flow through the first heat exchange unit, the second electronic expansion valve, the second heat exchanger, the third electronic expansion valve and the third heat exchanger of the indoor unit, flows back to the fourth end of the switching unit through the first stop valve in the switching unit, and is output from the third end of the switching unit; if the outdoor unit is in a heating working condition, the refrigerant output by the fourth end connected with the first end of the driving switching unit sequentially flows through the third heat exchanger, the third electronic expansion valve, the second heat exchanger and the second electronic expansion valve of the indoor unit, flows back to the second end of the switching unit through the second stop valve of the outdoor unit and the first heat exchange unit, and is output from the third end of the switching unit. Therefore, the indoor unit and the outdoor unit both adopt electronic expansion valves, and a special dehumidification solenoid valve does not need to be developed or an electromagnetic valve does not need to be added, so that the system cost is reduced, the system control precision is ensured, and the system control difficulty is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings in the following description are merely exemplary of the invention and that other embodiments and drawings may be devised by those skilled in the art based on the exemplary embodiments shown in the drawings.
Fig. 1 is a schematic structural diagram of a conventional multi-split heat pump air conditioning system.
Fig. 2 is a schematic structural diagram of a multi-split heat pump air conditioning system according to an embodiment of the invention.
Fig. 3 is a schematic view of an indoor unit for achieving indoor cooling-free dehumidification according to an embodiment of the present invention.
Fig. 4 is another schematic structural diagram of an indoor unit according to an embodiment of the present invention.
Fig. 5 is a schematic view of another structure of an indoor unit according to an embodiment of the present invention.
Fig. 6 is a flowchart illustrating a method for controlling a multi-split heat pump air conditioning system according to an embodiment of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the existing multi-split air-conditioning system, a reheating heat exchanger is added, high-temperature and high-pressure refrigerant flowing from an outdoor heat exchanger flows through the reheating heat exchanger, so that heat is discharged into return air, and the other part of the return air is cooled and dehumidified by an evaporator and then is mixed with the heated return air and then is sent into a room, so that the functions of cooling and dehumidifying are realized, and the cost of the system is increased; or, the special dehumidification electromagnetic valve is developed or a plurality of electromagnetic valves are added to realize the function of cooling and dehumidification, so that the cost is increased, the control difficulty of the multi-split heat pump air-conditioning system is increased, and the control precision is difficult to ensure.
In the embodiment of the invention, from the economic and control perspectives, a novel high-performance indoor unit for a multi-split heat pump air-conditioning system is designed, the multi-split heat pump air-conditioning system with the non-cooling and dehumidifying functions is provided, the purposes of refrigeration, heating and non-cooling and dehumidifying are realized while the high-efficiency operation of the multi-split heat pump air-conditioning system is ensured, and the high-standard requirements of users are met.
The multi-split heat pump air conditioning system provided by the embodiment of the invention can meet the cooling-free and dehumidifying functions of indoor refrigeration in summer, heating in winter and plum rain season. From the economical point of view, the indoor unit related to the embodiment of the invention does not need to additionally increase a heat exchanger; from the aspects of improving the control precision and reducing the control difficulty, the indoor unit and the outdoor unit related to the embodiment of the invention both adopt the electronic expansion valve, so that a special dehumidification electromagnetic valve does not need to be developed or an electromagnetic valve does not need to be added.
Fig. 2 is a schematic structural diagram of a multi-split heat pump air conditioning system according to an embodiment of the invention. Referring to fig. 2, the multi-split heat pump air conditioning system includes: one or more outdoor units 01, one or more indoor units 02,
preferably, the indoor unit 02 may be an indoor unit including a non-cooling and dehumidifying function according to an embodiment of the present invention, or an indoor unit adopted in the prior art, that is, an indoor unit having only cooling and heating functions.
The outdoor unit 01 includes: a control unit, a confluence unit, a switching unit and a first heat exchange unit, wherein,
the control unit is used for controlling the first heat exchanger 4 in the first heat exchange unit to be a condenser and the second heat exchanger 13 and the third heat exchanger 14 in the indoor unit 02 to be evaporators when the multi-split heat pump air-conditioning system is in a refrigeration working condition; when the multi-split heat pump air-conditioning system is in a heating working condition, controlling a first heat exchanger 4 in a first heat exchange unit to be an evaporator, and controlling a second heat exchanger 13 and a third heat exchanger 14 in an indoor unit 02 to be condensers; when the multi-split heat pump air-conditioning system is in a non-cooling and dehumidifying working condition, controlling a first heat exchanger 4 in a first heat exchange unit and a second heat exchanger 13 in an indoor unit 02 to be condensers, and controlling a third heat exchanger 14 in the indoor unit 02 to be an evaporator;
the switching unit is used for controlling the first end of the switching unit to be communicated with the second end and the third end to be communicated with the fourth end when the multi-split heat pump air-conditioning system is in a refrigeration and non-cooling dehumidification working condition, the first end receives the output of the confluence unit and outputs the output to the first heat exchange unit from the second end, and the fourth end receives the output of the indoor unit and outputs the output to the confluence unit from the third end; when the multi-split heat pump air-conditioning system is in a heating working condition, the first end of the control switching unit is communicated with the fourth end, the second end of the control switching unit is communicated with the third end, the first end receives the output of the confluence unit and outputs the output to the first end of the indoor unit from the fourth end, the second end receives the output of the first heat exchange unit and outputs the output to the confluence unit from the third end;
the confluence unit is used for outputting the refrigerant output by the switching unit to the switching unit after gas-liquid separation and compression;
and the first heat exchange unit is used for driving outdoor air to flow through the first heat exchanger 4 in the first heat exchange unit, one end of the first heat exchange unit is connected with the second end of the switching unit, and the other end of the first heat exchange unit is connected with the second end of the indoor unit.
Wherein,
the switching unit includes: a four-way selector valve 3 and a first shut-off valve 8, wherein,
the first end of the four-way reversing valve 3 is connected with the output end of the confluence unit, the second end of the four-way reversing valve is connected with the input end of the first heat exchange unit, the third end of the four-way reversing valve is connected with the input end of the confluence unit, the fourth end of the four-way reversing valve is connected with one end of the first stop valve 8, and the other end of the first stop valve 8 is connected with the first end of the indoor unit.
The bus bar unit includes: a compressor 1, a check valve 2, and a gas-liquid separator 7, wherein,
the output end of the compressor 1 is connected with the input end of the one-way valve 2, the output end of the one-way valve is connected with the first end of the four-way reversing valve 3, the input end of the gas-liquid separator 7 is connected with the third end of the four-way reversing valve 3, and the output end of the gas-liquid separator 7 is connected with the input end of the compressor 1.
In the embodiment of the present invention, the compressor 1 may be composed of one or more constant speed compressors, may be composed of a variable speed compressor, or may be composed of a combination of a constant speed compressor and a variable speed compressor.
The first heat exchange unit comprises: a first heat exchanger 4, an outdoor side fan 5, a first electronic expansion valve 6, and a second shutoff valve 9, wherein,
one end of the first heat exchanger 4 is connected with the second end of the four-way reversing valve 3, and the other end of the first heat exchanger is connected with one end of the first electronic expansion valve 6;
the other end of the first electronic expansion valve 6 is connected with one end of a second stop valve 9;
the other end of the second stop valve 9 is connected with the second end of the indoor unit;
the outdoor side fan 5 serves to drive outdoor air to flow through the first heat exchanger 4.
In the embodiment of the present invention, the outdoor fan 5 is an axial fan, and the outdoor fan 5 rotates to drive outdoor air to flow through the first heat exchanger 4.
Thus, the outdoor unit 01 includes: a compressor 1, a one-way valve 2, a four-way reversing valve 3, a first heat exchanger 4, an outdoor fan 5, a first electronic expansion valve 6, a gas-liquid separator 7, a first stop valve 8 and a second stop valve 9, wherein,
the output end of the compressor 1 is connected with one end of the one-way valve 2, and the input end of the compressor is connected with the output end of the gas-liquid separator 7;
the other end of the one-way valve 2 is connected with the first end of the four-way reversing valve 3;
the second end of the four-way reversing valve 3 is connected with one end of the first heat exchanger 4, the third end of the four-way reversing valve is connected with the input end of the gas-liquid separator 7, and the fourth end of the four-way reversing valve is connected with one end of the first stop valve 8;
the other end of the first heat exchanger 4 is connected with one end of a first electronic expansion valve 6;
the other end of the first electronic expansion valve 6 is connected with one end of a second stop valve 9;
the other end of the first stop valve 8 is output to a first end of the outdoor unit 02, and the other end of the second stop valve 9 is output to a second end of the outdoor unit 02.
The indoor unit 02 includes: an indoor side fan 10, a second electronic expansion valve 11, a second heat exchanger 13, a third electronic expansion valve 17, and a third heat exchanger 14, wherein,
one end of a second electronic expansion valve 11 is connected with the other end of the second stop valve 9, and the other end of the second electronic expansion valve is connected with one end of a second heat exchanger 13;
the other end of the second heat exchanger 13 is connected with one end of a third electronic expansion valve 17;
the other end of the third electronic expansion valve 17 is connected with one end of the third heat exchanger 14;
the other end of the third heat exchanger 14 is connected with the other end of the first cutoff valve 8;
the indoor-side fan 10 is used to drive the indoor return air to flow through the second heat exchanger 13 and the third heat exchanger 14.
In the embodiment of the present invention, the indoor side fan 10 may be a centrifugal fan or a perfusion fan, and the indoor return air is driven to flow through the second heat exchanger 13 and the third heat exchanger 14 by the rotation of the indoor side fan 10.
The first heat exchanger 4, the second heat exchanger 13 and the third heat exchanger 14 may be aluminum foil-fin copper tube heat exchangers or aluminum fin-type microchannel heat exchangers.
Preferably, the second heat exchanger 13 is located at an upper portion of the third heat exchanger 14 in a direction in which the heat exchangers are placed (height).
In practical application, a single heat exchanger can be divided into an upper part and a lower part by connecting and welding the bent pipes on the end surfaces of the heat exchangers, for example, the heat exchanger in the indoor unit can be divided into the upper part and the lower part, namely the second heat exchanger 13 and the third heat exchanger 14, by connecting and welding the bent pipes on the end surfaces of the heat exchangers, so that the second heat exchanger 13 and the third heat exchanger 14 are formed.
Preferably, the indoor unit may further include: a first temperature sensor 12, a second temperature sensor 15, and a third temperature sensor 16, wherein,
the first temperature sensor 12 is arranged on a refrigerant pipeline between the second electronic expansion valve 11 and the second heat exchanger 13 and close to one end of the second heat exchanger 13;
the second temperature sensor 15 is arranged on the refrigerant line between the third heat exchanger 14 and the first cut-off valve 8 and near one end of the third heat exchanger 14;
a third temperature sensor 16 is arranged on the refrigerant line between the third electronic expansion valve 17 and the third heat exchanger 14 and near one end of the third heat exchanger 14.
In the embodiment of the present invention, the first temperature sensor 12, the second temperature sensor 15, and the third temperature sensor 16 are respectively used for sensing the temperature of the refrigerant pipeline at the arrangement position, so that the electronic expansion valve on the corresponding refrigerant pipeline adjusts the valve opening of the electronic expansion valve according to the temperature sensed by the temperature sensor, thereby implementing the functions of cooling, heating, and non-cooling and dehumidifying.
Thus, the indoor unit 02 includes: an indoor side fan 10, a second electronic expansion valve 11, a first temperature sensor 12, a second heat exchanger 13, a third heat exchanger 14, a second temperature sensor 15, a third temperature sensor 16, and a third electronic expansion valve 17, wherein,
one end of the second electronic expansion valve 11 is connected with one end of the second heat exchanger 13, the first temperature sensor 12 is arranged on a refrigerant pipeline between the second electronic expansion valve 11 and the second heat exchanger 13 and close to one end of the second heat exchanger 13, and the other end of the second electronic expansion valve 11 is connected with the other end of the second stop valve 9;
the other end of the second heat exchanger 13 is connected with one end of a third electronic expansion valve 17;
the other end of the third electronic expansion valve 17 is connected with one end of the third heat exchanger 14, and the third temperature sensor 16 is arranged on a refrigerant pipeline between the third electronic expansion valve 17 and the third heat exchanger 14 and close to one end of the third heat exchanger 14;
the other end of the third heat exchanger 14 is connected with the other end of the first stop valve 8, and the second temperature sensor 15 is arranged on a refrigerant pipeline which is arranged between the third heat exchanger 14 and the first stop valve 8 and is close to one end of the third heat exchanger 14;
the indoor-side fan 10 is used to drive the indoor return air to flow through the second heat exchanger 13 and the third heat exchanger 14.
The working process of the multi-split heat pump air conditioning system according to the embodiment of the invention is described in detail below.
The refrigerant is discharged from an exhaust port (output end) of the compressor 1 and enters the one-way valve 2, and high-pressure refrigerant gas output by the one-way valve 2 enters the first end of the four-way reversing valve 3;
when the multi-split heat pump air conditioning system is in a refrigeration and non-cooling dehumidification working condition:
the first end and the second end of the four-way reversing valve 3 are communicated, the third end and the fourth end are communicated, refrigerant sequentially flows through the second end of the four-way reversing valve 3, the first heat exchanger 4, the first electronic expansion valve 6, the second stop valve 9, the second electronic expansion valve 11, the second heat exchanger 13, the third electronic expansion valve 17, the third heat exchanger 14, the first stop valve 8 and the fourth end of the four-way reversing valve 3, and then flows through the gas-liquid separator 7 from the third end of the four-way reversing valve 3 to enter an air suction port (input end) of the compressor 1;
when the multi-split heat pump air conditioning system is in a heating working condition:
the first end and the fourth end of the four-way reversing valve 3 are communicated, the second end and the third end are communicated, refrigerant flows through the fourth end of the four-way reversing valve 3, the first stop valve 8, the third heat exchanger 14, the third electronic expansion valve 17, the second heat exchanger 13, the second electronic expansion valve 11, the second stop valve 9, the first electronic expansion valve 6, the first heat exchanger 4 and the second end of the four-way reversing valve 3 in sequence, and then flows through the gas-liquid separator 7 from the third end of the four-way reversing valve 3 to enter the air suction port of the compressor 1.
In order to realize the refrigeration, heating and cooling-free dehumidification functions of the multi-split heat pump air-conditioning system, the adjustment control method of each electronic expansion valve and the working process of each heat exchanger under different working conditions are as follows:
under the refrigeration working condition, the first electronic expansion valve 6 and the third electronic expansion valve 17 are fully opened, the second electronic expansion valve 11 is throttled, and the flow of the flowing refrigerant is adjusted, under the refrigeration working condition, the first heat exchanger 4 is a condenser, the second heat exchanger 13 and the third heat exchanger 14 are evaporators, low-temperature air sent out by the indoor unit 02 is used for indoor refrigeration, and the valve opening degree of the second electronic expansion valve 11 is controlled by the difference value of the temperatures collected by the second temperature sensor 15 and the first temperature sensor 12, namely the evaporation superheat degree; wherein,
SH=T15-T12
in the formula,
SH is evaporation superheat degree, and the opening degree of the valve is controlled through calculation of the evaporation superheat degree;
T15a temperature value collected for the second temperature sensor 15;
T12the temperature value collected for the first temperature sensor 12.
Under the heating working condition, the third electronic expansion valve 17 is fully opened, the first electronic expansion valve 6 and the second electronic expansion valve 11 are throttled, and the flow of the flowing refrigerant is correspondingly adjusted, under the heating working condition, the first heat exchanger 4 is an evaporator, the second heat exchanger 13 and the third heat exchanger 14 are condensers, and high-temperature air sent by the indoor unit 02 is used for indoor heating; the valve opening degree of the second electronic expansion valve 11 is controlled by the difference value of the condensation temperature of the high-pressure refrigerant and the temperature collected by the first temperature sensor 12, namely the condensation supercooling degree; wherein,
SC=Tc-T12
in the formula,
SC is condensation supercooling degree;
TCis the condensation temperature value of the refrigerant;
T12the temperature value collected for the first temperature sensor 12.
Under the working condition of no temperature reduction and dehumidification, the first electronic expansion valve 6 and the second electronic expansion valve 11 are fully opened, the third electronic expansion valve 17 is throttled, under the working condition of no temperature reduction and dehumidification, the first heat exchanger 4 and the second heat exchanger 13 are both condensers, the third heat exchanger 14 is an evaporator, one part of return air flowing through the indoor unit 02 is heated by the second heat exchanger 13 into hot air, the other part of return air is dehumidified and cooled by the third heat exchanger 14, and treated cold air and the hot air are mixed and then are sent into a room to realize no temperature reduction and dehumidification in the room; the valve opening degree of the third electronic expansion valve 17 is controlled by the difference between the temperatures collected by the second temperature sensor 15 and the third temperature sensor 16, i.e., the evaporation superheat degree. Wherein,
SH′=T15-T16
in the formula,
SH' is the degree of superheat of evaporation;
T15a temperature value collected for the second temperature sensor 15;
T16is the third temperatureThe temperature value collected by the degree sensor 16.
Fig. 3 is a schematic view of an indoor unit for achieving indoor cooling-free dehumidification according to an embodiment of the present invention. Referring to fig. 3, the second heat exchanger 13 is a condenser, the third heat exchanger 14 is an evaporator, the indoor fan 10 is started to drive the indoor return air to flow through the second heat exchanger 13 and the third heat exchanger 14, so that the return air flowing through the indoor unit 02 forms two parts of return air, one part of return air is heated by the second heat exchanger 13 to be hot air, the other part of return air is dehumidified and cooled by the third heat exchanger 14, and then the hot air heated by the second heat exchanger 13 and the cold air dehumidified and cooled by the third heat exchanger 14 are mixed and then sent into the room, so that the indoor temperature and humidity can be reduced and dehumidified without being reduced.
Fig. 4 is another schematic structural diagram of an indoor unit according to an embodiment of the present invention. Referring to fig. 4, in the embodiment, for an optimized and optional embodiment, two groups of heat exchangers are adopted, one group of heat exchangers is composed of a second heat exchanger 13 and a third heat exchanger 14, the other group of heat exchangers is composed of a fourth heat exchanger 13 'and a fifth heat exchanger 14', and the two groups of heat exchangers are connected by a sheet metal part 20 to form a V-shaped heat exchanger, so that the heat exchange area can be increased in a limited space of an indoor unit, and the refrigerating capacity, the heating capacity and the dehumidifying capacity of the multi-split heat pump air conditioning system are improved.
Wherein, the other end of the second heat exchanger 13 is connected with one end of a fourth heat exchanger 13';
the other end of the fourth heat exchanger 13' is connected with one end of a third electronic expansion valve 17;
the other end of the third electronic expansion valve 17 is connected with one end of the third heat exchanger 14, and the third temperature sensor 16 is arranged on a refrigerant pipeline between the third electronic expansion valve 17 and the third heat exchanger 14 and close to one end of the third heat exchanger 14;
the other end of the third heat exchanger 14 is connected with one end of a fifth heat exchanger 14';
the other end of the fifth heat exchanger 14 ' is connected to the other end of the first cut-off valve 8, and a second temperature sensor 15 is disposed on the refrigerant pipe between the fifth heat exchanger 14 ' and the first cut-off valve 8 and near one end of the fifth heat exchanger 14 '.
In the embodiment of the invention, in terms of heat exchanger functions, the second heat exchanger 13 and the fourth heat exchanger 13 'are connected through a refrigerant pipeline, and the third heat exchanger 14 and the fifth heat exchanger 14' are identical in function, that is, the second heat exchanger 13 and the fourth heat exchanger 13 'are both condensers or both evaporators, and the third heat exchanger 14 and the fifth heat exchanger 14' are both evaporators or both condensers.
Taking the refrigerant and air supply circulation process under the non-cooling and dehumidifying condition as an example, in fig. 4, the refrigerant sequentially flows through the second electronic expansion valve 11, the second heat exchanger 13, the fourth heat exchanger 13 ', the third electronic expansion valve 17, the third heat exchanger 14 and the fifth heat exchanger 14', under the condition, the second electronic expansion valve 11 is fully opened, the third electronic expansion valve 17 throttles, the second heat exchanger 13 and the fourth heat exchanger 13 'are both condensers, the third heat exchanger 14 and the fifth heat exchanger 14' are both evaporators, the processed return air sequentially comprises hot air, cold air, hot air and cold air from top to bottom, namely the return air flows out of the second heat exchanger 13 is hot air, the return air flows out of the third heat exchanger 14 is cold air, the return air flows out of the fourth heat exchanger 13 'is hot air, the return air flows out of the fifth heat exchanger 14' is cold air, and the hot air and the cold air are mixed to form air supply. Therefore, the air supply mixing device is beneficial to mixing of air supplies with different temperatures, and therefore the air supply comfort and the thermal performance of the multi-split heat pump air-conditioning system are improved.
In the present embodiment, in fig. 3 and 4, the control law of each electronic expansion valve is the same as that in fig. 2. In fig. 4, the second temperature sensor 15 is arranged on the refrigerant pipe between the first cut valve 8 and the fifth heat exchanger 14 'and near one end of the fifth heat exchanger 14', and the other temperature sensors are not changed in position.
Fig. 5 is a schematic view of another structure of an indoor unit according to an embodiment of the present invention. Referring to fig. 5, unlike fig. 3, the third electronic expansion valve 17 is replaced with a thermostatic expansion valve 18 and a solenoid valve 19 connected in parallel, that is, one end of the thermostatic expansion valve 18 is connected to one end of the solenoid valve 19 and to the other end of the second heat exchanger 13, the other end of the thermostatic expansion valve 18 is connected to the other end of the solenoid valve 19 and to one end of the third heat exchanger 14, and a bulb 15' of the thermostatic expansion valve is disposed on the refrigerant line between the first cutoff valve 8 and the third heat exchanger 14 and near one end of the third heat exchanger 14.
In the embodiment of the present invention, the functions of the heat exchangers under different working conditions are the same as the functions of the corresponding heat exchangers in the embodiment shown in fig. 2, and in the two embodiments (fig. 2 and 5), the control laws of the first electronic expansion valve 6 and the second electronic expansion valve 11 are also respectively and correspondingly the same. In contrast, in this embodiment, the third electronic expansion valve 17 is replaced by the thermostatic expansion valve 18 and the electromagnetic valve 19 which are connected in parallel, and the correspondence rule is as follows: when the electromagnetic valve 19 is opened, the third electronic expansion valve 17 is fully opened; when the electromagnetic valve 19 is closed and the thermostatic expansion valve 18 is adjusted, throttling adjustment is performed corresponding to the third electronic expansion valve 17, and the valve opening degree of the thermostatic expansion valve 18 is controlled by the temperature measured by the temperature sensing bulb 15'.
As can be seen from the above description, in the multi-split heat pump air conditioning system according to the embodiment of the present invention, the outdoor units can be shared, the indoor units do not need to additionally add a reheat heat exchanger, and one heat exchanger is divided into the upper part and the lower part by connecting and welding the elbows on the end surfaces of the heat exchangers in the indoor units, so that high economy is achieved, the equipment cost is effectively reduced, centralized management of each indoor unit can be realized, one indoor unit can be independently started to operate, or multiple indoor units can be simultaneously started to operate, so that the control is more flexible; the indoor unit can realize the functions of refrigerating in summer, heating in winter and dehumidifying without cooling in plum rain, thereby improving the air supply comfort; furthermore, the indoor unit and the outdoor unit of the embodiment of the invention both adopt electronic expansion valves, and a special dehumidification solenoid valve does not need to be developed or added, so that the control precision of the system is ensured, and the control difficulty of the system is reduced.
Fig. 6 is a flowchart illustrating a method for controlling a multi-split heat pump air conditioning system according to an embodiment of the present invention. Referring to fig. 6, the process includes:
step 601, the confluence unit of the outdoor unit receives the refrigerant output by the third end of the switching unit, and outputs the refrigerant to the first end of the switching unit after gas-liquid separation and compression;
in this step, the switching unit includes: a four-way reversing valve and a first stop valve, wherein,
the first end of the four-way reversing valve is connected with the output end of the confluence unit, the second end of the four-way reversing valve is connected with the input end of the first heat exchange unit, the third end of the four-way reversing valve is connected with the input end of the confluence unit, the fourth end of the four-way reversing valve is connected with one end of the first stop valve, and the other end of the first stop valve is connected with the first end of the indoor unit;
the bus bar unit includes: a compressor, a one-way valve and a gas-liquid separator, wherein,
the output end of the compressor is connected with the input end of the one-way valve, the output end of the one-way valve is connected with the first end of the four-way reversing valve, the input end of the gas-liquid separator is connected with the third end of the four-way reversing valve, and the output end of the gas-liquid separator is connected with the input end of the compressor.
Step 602, judging the working condition of the multi-split heat pump air conditioning system, executing step 603 if the multi-split heat pump air conditioning system is in a refrigerating and non-cooling dehumidifying working condition, and executing step 604 if the multi-split heat pump air conditioning system is in a heating working condition;
step 603, driving the refrigerant output by the second end of the switching unit connected with the first end to sequentially flow through the first heat exchange unit, and a second electronic expansion valve, a second heat exchanger, a third electronic expansion valve and a third heat exchanger of the indoor unit, flow back to the fourth end of the switching unit through a first stop valve in the switching unit, and then output from the third end of the switching unit;
in this step, the first heat exchange unit includes: a first heat exchanger, an outdoor side fan, a first electronic expansion valve and a second stop valve,
one end of the first heat exchanger is connected with the second end of the four-way reversing valve, and the other end of the first heat exchanger is connected with one end of the first electronic expansion valve;
the other end of the first electronic expansion valve is connected with one end of the second stop valve;
the other end of the second stop valve is connected with the second end of the indoor unit;
the outdoor side fan is used for driving outdoor air to flow through the first heat exchanger;
the indoor set still includes: an indoor side fan for driving indoor return air to flow through the second heat exchanger and the third heat exchanger;
thus, the steps include:
the first end and the second end of the four-way reversing valve are communicated, the third end and the fourth end of the four-way reversing valve are communicated, and the refrigerant flows through the second end of the four-way reversing valve, the first heat exchanger, the first electronic expansion valve, the second stop valve, the second electronic expansion valve, the third heat exchanger, the first stop valve and the fourth end of the four-way reversing valve in sequence and then flows through the gas-liquid separator from the third end of the four-way reversing valve to enter an air suction port of the compressor.
Under the refrigeration working condition, the first electronic expansion valve and the third electronic expansion valve are fully opened, the second electronic expansion valve is throttled, the first heat exchanger is a condenser, the second heat exchanger and the third heat exchanger are evaporators, low-temperature air sent out by an indoor unit is used for indoor refrigeration, and the valve opening degree of the second electronic expansion valve is controlled through the difference value of the temperatures collected by the second temperature sensor and the first temperature sensor.
Under the working condition of no temperature reduction and dehumidification, the first electronic expansion valve and the second electronic expansion valve are fully opened, the third electronic expansion valve is used for throttling, the first heat exchanger and the second heat exchanger are both condensers, the third heat exchanger is an evaporator, one part of return air flowing through the indoor unit is heated by the second heat exchanger to be hot air, the other part of return air is dehumidified and cooled by the third heat exchanger, and processed cold air and the hot air are mixed and then are sent into the indoor unit; the valve opening degree of the third electronic expansion valve is controlled by the difference value of the temperatures collected by the second temperature sensor and the third temperature sensor.
Step 604, the refrigerant output from the fourth end of the switching unit connected to the first end is driven to flow through the third heat exchanger, the third electronic expansion valve, the second heat exchanger and the second electronic expansion valve of the indoor unit in sequence, and then flows back to the second end of the switching unit through the second stop valve of the outdoor unit and the first heat exchange unit, and is output from the third end of the switching unit.
The method comprises the following specific steps:
the first end and the fourth end of the four-way reversing valve are communicated, the second end and the third end of the four-way reversing valve are communicated, refrigerant sequentially flows through the fourth end of the four-way reversing valve, the first stop valve, the third heat exchanger, the third electronic expansion valve, the second heat exchanger, the second electronic expansion valve, the second stop valve, the first electronic expansion valve, the first heat exchanger and the second end of the four-way reversing valve, then flows through the gas-liquid separator from the third end of the four-way reversing valve, and enters an air suction port of the compressor.
The first heat exchanger is an evaporator, the second heat exchanger and the third heat exchanger are condensers, and high-temperature air sent by the indoor unit is used for indoor heating; the valve opening degree of the second electronic expansion valve is controlled by the difference value of the condensation temperature of the high-pressure refrigerant and the temperature collected by the first temperature sensor.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also encompasses these modifications and variations.

Claims (17)

1. A multi-split heat pump air conditioning system, comprising: an outdoor unit and an indoor unit, wherein,
the outdoor unit includes: the heat exchanger comprises a control unit, a confluence unit, a switching unit and a first heat exchange unit, wherein the first heat exchange unit is provided with a first heat exchanger;
the indoor unit includes: the indoor side fan, the second electronic expansion valve, the second heat exchanger, the third electronic expansion valve, the third heat exchanger, the fourth heat exchanger and the fifth heat exchanger;
the control unit is used for controlling a first heat exchanger in the first heat exchange unit to be a condenser and a second heat exchanger and a third heat exchanger in the indoor unit to be evaporators when the multi-split heat pump air-conditioning system is in a refrigeration working condition; when the multi-split heat pump air-conditioning system is in a heating working condition, controlling a first heat exchanger in a first heat exchange unit to be an evaporator, and controlling a second heat exchanger and a third heat exchanger in an indoor unit to be condensers; when the multi-split heat pump air-conditioning system is in a non-cooling dehumidification working condition, controlling a first heat exchanger in a first heat exchange unit and a second heat exchanger in an indoor unit to be condensers, and controlling a third heat exchanger in the indoor unit to be an evaporator;
the switching unit is used for controlling the first end of the switching unit to be communicated with the second end and the third end to be communicated with the fourth end when the multi-split heat pump air-conditioning system is in a refrigeration and non-cooling dehumidification working condition, the first end receives the output of the confluence unit and outputs the output to the first heat exchange unit from the second end, and the fourth end receives the output of the indoor unit and outputs the output to the confluence unit from the third end; when the multi-split heat pump air-conditioning system is in a heating working condition, the first end of the control switching unit is communicated with the fourth end, the second end of the control switching unit is communicated with the third end, the first end receives the output of the confluence unit and outputs the output to the first end of the indoor unit from the fourth end, the second end receives the output of the first heat exchange unit and outputs the output to the confluence unit from the third end;
the confluence unit is used for outputting the refrigerant output by the switching unit to the switching unit after gas-liquid separation and compression;
the first heat exchange unit is used for driving outdoor air to flow through a first heat exchanger in the first heat exchange unit, one end of the first heat exchange unit is connected with the second end of the switching unit, and the other end of the first heat exchange unit is connected with the second end of the indoor unit;
one end of the second electronic expansion valve is connected with one end of the second stop valve facing the indoor unit, and the other end of the second electronic expansion valve is connected with one end of the second heat exchanger;
the indoor side fan is used for driving indoor return air to flow through the second heat exchanger and the third heat exchanger;
the second heat exchanger and the third heat exchanger form a group of heat exchangers, the fourth heat exchanger and the fifth heat exchanger form another group of heat exchangers, and the two groups of heat exchangers are connected by sheet metal parts to form a V-shaped heat exchanger;
the other end of the second heat exchanger is connected with one end of a fourth heat exchanger;
the other end of the fourth heat exchanger is connected with one end of a third electronic expansion valve;
the other end of the third electronic expansion valve is connected with one end of a third heat exchanger;
the other end of the third heat exchanger is connected with one end of the fifth heat exchanger;
the other end of the fifth heat exchanger is connected with one end, outputting to the first end of the outdoor unit, of the first stop valve, and the second temperature sensor is arranged on a refrigerant pipeline which is arranged between the fifth heat exchanger and the first stop valve and close to one end of the fifth heat exchanger.
2. The system of claim 1, wherein the switching unit comprises: a four-way reversing valve and a first stop valve, wherein,
the first end of the four-way reversing valve is connected with the output end of the confluence unit, the second end of the four-way reversing valve is connected with the input end of the first heat exchange unit, the third end of the four-way reversing valve is connected with the input end of the confluence unit, the fourth end of the four-way reversing valve is connected with one end of the first stop valve, and the other end of the first stop valve is connected with the first end of the indoor unit.
3. The system of claim 2, wherein the bus bar unit comprises: a compressor, a one-way valve and a gas-liquid separator, wherein,
the output end of the compressor is connected with the input end of the one-way valve, the output end of the one-way valve is connected with the first end of the four-way reversing valve, the input end of the gas-liquid separator is connected with the third end of the four-way reversing valve, and the output end of the gas-liquid separator is connected with the input end of the compressor.
4. The system of claim 3, wherein the first heat exchange unit comprises: a first heat exchanger, an outdoor side fan, a first electronic expansion valve and a second stop valve,
one end of the first heat exchanger is connected with the second end of the four-way reversing valve, and the other end of the first heat exchanger is connected with one end of the first electronic expansion valve;
the other end of the first electronic expansion valve is connected with one end of the second stop valve;
the other end of the second stop valve is connected with the second end of the indoor unit;
the outdoor side fan is used for driving outdoor air to flow through the first heat exchanger.
5. The system of claim 4, wherein the compressor is comprised of one or more fixed speed compressors, or a variable speed compressor, or a combination of fixed and variable speed compressors.
6. The system of claim 4,
the outdoor side fan is an axial flow fan;
the indoor side fan is a centrifugal fan or a perfusion fan.
7. The system of claim 4, wherein the first heat exchanger, the second heat exchanger, and the third heat exchanger are aluminum foil-fin-copper tube heat exchangers or aluminum fin-type microchannel heat exchangers.
8. The system of claim 4, wherein the second heat exchanger is in an upper portion of the third heat exchanger.
9. The system according to any one of claims 1 to 8, characterized in that said indoor unit further comprises: a first temperature sensor, a second temperature sensor, and a third temperature sensor, wherein,
the first temperature sensor is arranged on a refrigerant pipeline between the second electronic expansion valve and the second heat exchanger and close to one end of the second heat exchanger;
the second temperature sensor is arranged on the refrigerant pipeline between the fifth heat exchanger and the first stop valve and close to one end of the fifth heat exchanger;
and the third temperature sensor is arranged on the refrigerant pipeline between the third electronic expansion valve and the third heat exchanger and close to one end of the third heat exchanger.
10. The system of claims 3-8 wherein refrigerant exits the compressor discharge port into a one-way valve, and high pressure refrigerant gas output by the one-way valve enters the first end of the four-way reversing valve;
when the multi-split heat pump air conditioning system is in a refrigeration and non-cooling dehumidification working condition:
the first end and the second end of the four-way reversing valve are communicated, the third end and the fourth end of the four-way reversing valve are communicated, refrigerant sequentially flows through the second end of the four-way reversing valve, the first heat exchanger, the first electronic expansion valve, the second stop valve, the second electronic expansion valve, the second heat exchanger, the fourth heat exchanger, the third electronic expansion valve, the third heat exchanger, the fifth heat exchanger, the first stop valve and the fourth end of the four-way reversing valve, and then flows through the gas-liquid separator from the third end of the four-way reversing valve to enter an air suction port of the compressor;
when the multi-split heat pump air conditioning system is in a heating working condition:
the first end and the fourth end of the four-way reversing valve are communicated, the second end and the third end of the four-way reversing valve are communicated, refrigerant sequentially flows through the fourth end of the four-way reversing valve, the first stop valve, the fifth heat exchanger, the third electronic expansion valve, the fourth heat exchanger, the second electronic expansion valve, the second stop valve, the first electronic expansion valve, the first heat exchanger and the second end of the four-way reversing valve, and then flows through the gas-liquid separator from the third end of the four-way reversing valve to enter an air suction port of the compressor.
11. The system of claim 10,
under the working condition of refrigeration, the first electronic expansion valve and the third electronic expansion valve are fully opened, the second electronic expansion valve is throttled, the first heat exchanger is a condenser, the second heat exchanger and the third heat exchanger are evaporators, low-temperature air sent out by an indoor unit is used for indoor refrigeration, and the valve opening degree of the second electronic expansion valve is controlled by the difference value of the temperatures collected by the second temperature sensor and the first temperature sensor;
under the working condition of no cooling and dehumidification, the first electronic expansion valve and the second electronic expansion valve are fully opened, the third electronic expansion valve is throttled, the first heat exchanger, the second heat exchanger and the fourth heat exchanger are condensers, the third heat exchanger and the fifth heat exchanger are evaporators, one part of return air flowing through the indoor unit is heated by the second heat exchanger and the fourth heat exchanger to be hot air, the other part of return air is dehumidified and cooled by the third heat exchanger and the fifth heat exchanger, and processed cold air and the hot air are mixed and then are sent into the indoor unit; the valve opening degree of the third electronic expansion valve is controlled by the difference value of the temperatures acquired by the second temperature sensor and the third temperature sensor;
under the heating condition, the third electronic expansion valve is fully opened, the first electronic expansion valve and the second electronic expansion valve are used for throttling, the first heat exchanger is an evaporator, the second heat exchanger, the third heat exchanger, the fourth heat exchanger and the fifth heat exchanger are condensers, and high-temperature air sent by the indoor unit is used for indoor heating; the valve opening degree of the second electronic expansion valve is controlled by the difference value of the condensation temperature of the high-pressure refrigerant and the temperature collected by the first temperature sensor.
12. The system of claim 1, wherein under a non-cooling dehumidification condition, the refrigerant flows through the second electronic expansion valve, the second heat exchanger, the fourth heat exchanger, the third electronic expansion valve, the third heat exchanger and the fifth heat exchanger in sequence, the second electronic expansion valve is fully opened, the third electronic expansion valve is throttled, the second heat exchanger and the fourth heat exchanger are both condensers, the third heat exchanger and the fifth heat exchanger are both evaporators, hot air flows out of the second heat exchanger, cold air flows out of the third heat exchanger, hot air flows out of the fourth heat exchanger, cold air flows out of the fifth heat exchanger, and the hot air and the cold air are mixed to form the air supply.
13. The system of claim 9, wherein the third electronic expansion valve is a thermostatic expansion valve and a solenoid valve connected in parallel, a bulb of the thermostatic expansion valve being disposed on the refrigerant line between the first shut-off valve and the third heat exchanger and near one end of the third heat exchanger, wherein,
when the electromagnetic valve is opened, the electromagnetic valve is fully opened corresponding to the third electronic expansion valve; when the electromagnetic valve is closed and the thermal expansion valve is adjusted, the throttle adjustment is carried out corresponding to the third electronic expansion valve, and the valve opening degree of the thermal expansion valve is controlled by the temperature measured by the temperature sensing bulb.
14. A method of controlling the multi-split heat pump air conditioning system as set forth in claim 1, the method comprising:
a, a converging unit of the outdoor unit receives the refrigerant output by the third end of the switching unit, performs gas-liquid separation and compression on the refrigerant, and outputs the refrigerant to the first end of the switching unit;
judging the working condition of the multi-split heat pump air-conditioning system:
b, if the indoor unit is in a refrigeration and non-cooling dehumidification working condition, driving the refrigerant output by the second end of the switching unit, which is connected with the first end, to sequentially flow through the first heat exchange unit and a second electronic expansion valve, a second heat exchanger, a fourth heat exchanger, a third electronic expansion valve, a third heat exchanger and a fifth heat exchanger of the indoor unit, flow back to the fourth end of the switching unit through a first stop valve in the switching unit, and then output from the third end of the switching unit;
and C, if the indoor unit is in a heating working condition, driving the refrigerant output by the fourth end connected with the first end of the switching unit to sequentially flow through the fifth heat exchanger, the third electronic expansion valve, the fourth heat exchanger, the second heat exchanger and the second electronic expansion valve of the indoor unit, flow back to the second end of the switching unit through the second stop valve of the outdoor unit and the first heat exchange unit, and then output from the third end of the switching unit.
15. The method of claim 14, wherein,
the switching unit includes: a four-way reversing valve and a first stop valve, wherein,
the first end of the four-way reversing valve is connected with the output end of the confluence unit, the second end of the four-way reversing valve is connected with the input end of the first heat exchange unit, the third end of the four-way reversing valve is connected with the input end of the confluence unit, the fourth end of the four-way reversing valve is connected with one end of the first stop valve, and the other end of the first stop valve is connected with the first end of the indoor unit;
the bus bar unit includes: a compressor, a one-way valve and a gas-liquid separator, wherein,
the output end of the compressor is connected with the input end of the one-way valve, the output end of the one-way valve is connected with the first end of the four-way reversing valve, the input end of the gas-liquid separator is connected with the third end of the four-way reversing valve, and the output end of the gas-liquid separator is connected with the input end of the compressor;
the first heat exchange unit comprises: a first heat exchanger, an outdoor side fan, a first electronic expansion valve and a second stop valve,
one end of the first heat exchanger is connected with the second end of the four-way reversing valve, and the other end of the first heat exchanger is connected with one end of the first electronic expansion valve;
the other end of the first electronic expansion valve is connected with one end of the second stop valve;
the other end of the second stop valve is connected with the second end of the indoor unit;
the outdoor side fan is used for driving outdoor air to flow through the first heat exchanger;
the indoor unit further includes: and the indoor side fan is used for driving indoor return air to flow through the second heat exchanger, the third heat exchanger, the fourth heat exchanger and the fifth heat exchanger.
16. The method of claim 15, wherein step B comprises:
the first end and the second end of the four-way reversing valve are communicated, the third end and the fourth end of the four-way reversing valve are communicated, refrigerant sequentially flows through the second end of the four-way reversing valve, the first heat exchanger, the first electronic expansion valve, the second stop valve, the second electronic expansion valve, the second heat exchanger, the fourth heat exchanger, the third electronic expansion valve, the third heat exchanger, the fifth heat exchanger, the first stop valve and the fourth end of the four-way reversing valve, and then flows through the gas-liquid separator from the third end of the four-way reversing valve to enter an air suction port of the compressor;
under the refrigeration working condition, the first electronic expansion valve and the third electronic expansion valve are fully opened, the second electronic expansion valve is throttled, the first heat exchanger is a condenser, the second heat exchanger, the third heat exchanger, the fourth heat exchanger and the fifth heat exchanger are evaporators, low-temperature air sent out by an indoor unit is used for indoor refrigeration, and the valve opening degree of the second electronic expansion valve is controlled by the difference value of the temperatures collected by the second temperature sensor and the first temperature sensor;
under the working condition of no cooling and dehumidification, the first electronic expansion valve and the second electronic expansion valve are fully opened, the third electronic expansion valve is throttled, the first heat exchanger, the second heat exchanger and the fourth heat exchanger are condensers, the third heat exchanger and the fifth heat exchanger are evaporators, one part of return air flowing through the indoor unit is heated by the second heat exchanger and the fourth heat exchanger to be hot air, the other part of return air is dehumidified and cooled by the third heat exchanger and the fifth heat exchanger, and processed cold air and the hot air are mixed and then are sent into the indoor unit; the valve opening degree of the third electronic expansion valve is controlled by the difference value of the temperatures collected by the second temperature sensor and the third temperature sensor.
17. The method of claim 15, wherein step C comprises:
the first end and the fourth end of the four-way reversing valve are communicated, the second end and the third end of the four-way reversing valve are communicated, refrigerant sequentially flows through the fourth end of the four-way reversing valve, the first stop valve, the fifth heat exchanger, the third electronic expansion valve, the fourth heat exchanger, the second electronic expansion valve, the second stop valve, the first electronic expansion valve, the first heat exchanger and the second end of the four-way reversing valve, and then flows through the gas-liquid separator from the third end of the four-way reversing valve and enters an air suction port of the compressor;
the third electronic expansion valve is fully opened, the first electronic expansion valve and the second electronic expansion valve are used for throttling, the first heat exchanger is an evaporator, the second heat exchanger, the third heat exchanger, the fourth heat exchanger and the fifth heat exchanger are condensers, and high-temperature air sent by the indoor unit is used for indoor heating; the valve opening degree of the second electronic expansion valve is controlled by the difference value of the condensation temperature of the high-pressure refrigerant and the temperature collected by the first temperature sensor.
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