CN111707015B - Air conditioning system and control method thereof - Google Patents

Air conditioning system and control method thereof Download PDF

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Publication number
CN111707015B
CN111707015B CN202010628910.XA CN202010628910A CN111707015B CN 111707015 B CN111707015 B CN 111707015B CN 202010628910 A CN202010628910 A CN 202010628910A CN 111707015 B CN111707015 B CN 111707015B
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China
Prior art keywords
port
valve
conditioning system
air conditioning
heat exchanger
Prior art date
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Active
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CN202010628910.XA
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Chinese (zh)
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CN111707015A (en
Inventor
胡余生
魏会军
巩庆霞
吴健
罗惠芳
柯达俊
邓罡
麦境治
尹雪峰
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Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
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Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
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Priority to CN202010628910.XA priority Critical patent/CN111707015B/en
Publication of CN111707015A publication Critical patent/CN111707015A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems

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

Abstract

The invention provides an air conditioning system and a control method of the air conditioning system. An air conditioning system includes: the compression assembly comprises a first compression part and a second compression part, the first compression part is provided with a first air suction port and a first air discharge port, and the second compression part is provided with a second air suction port and a second air discharge port; the first reversing component is used for switching the refrigerating and heating of the air conditioning system and is connected with the first air suction port and the first air exhaust port; the second reversing component is used for switching the refrigerating and heating of the air conditioning system and is connected with the second air suction port; the second exhaust port is connected with the second reversing component and the first air suction port; the first indoor heat exchanger is connected with the first reversing component; the second indoor heat exchanger is connected with the second reversing component; the outdoor heat exchanger is connected with the first reversing component, the second reversing component, the first indoor heat exchanger and the second indoor heat exchanger. The problem that an air conditioning system in the prior art cannot always be in the most economical running state is solved.

Description

Air conditioning system and control method thereof
Technical Field
The invention relates to the field of air conditioners, in particular to an air conditioning system and a control method of the air conditioning system.
Background
In some areas, the climate is changeable all the year round, as in the first Xia Shidu, the traditional fresh air conditioner needs lower evaporation temperature to meet the dehumidification requirement, but the evaporation temperature is reduced, for the compressor, the pressure ratio is increased, the operation is uneconomical, the reduction of the evaporation temperature leads to the reduction of the air outlet temperature of the indoor unit, and the human comfort is reduced; however, in the midsummer season, the outdoor temperature is high, and the common single-stage compression system is used, so that the risk of incapability of running due to overhigh exhaust temperature exists; meanwhile, in the early winter, the system operation working condition pressure is smaller and the load is smaller, but in the severe winter, the outdoor temperature is extremely low, and the system operation pressure ratio is large.
When the existing air conditioning system circulation mode realizes refrigeration/heating in regions with changeable climates throughout the year, the system cannot be ensured to be always in the most economical running state; even some existing air conditioning systems cannot operate under severe conditions.
Disclosure of Invention
The invention mainly aims to provide an air conditioning system and a control method thereof, which are used for solving the problem that the air conditioning system in the prior art cannot always be in the most economical running state.
In order to achieve the above object, according to one aspect of the present invention, there is provided an air conditioning system comprising: the compression assembly comprises a first compression part and a second compression part, the first compression part is provided with a first air suction port and a first air discharge port, and the second compression part is provided with a second air suction port and a second air discharge port; the first reversing component is used for switching the refrigerating and heating of the air conditioning system and is connected with the first air suction port and the first air exhaust port; the second reversing component is used for switching the refrigerating and heating of the air conditioning system and is connected with the second air suction port; the second exhaust port is connected with the second reversing component and the first air suction port; the first end of the first indoor heat exchanger is connected with the first reversing component; the first end of the second indoor heat exchanger is connected with the second reversing component; the first end of the outdoor heat exchanger is connected with the first reversing component and the second reversing component, and the second end of the outdoor heat exchanger is connected with the second end of the first indoor heat exchanger and the second end of the second indoor heat exchanger.
Further, the first reversing component is provided with a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is communicated with the second valve port or the fourth valve port, and the third valve port is communicated with the fourth valve port or the second valve port; the second valve port is connected with the first air suction port; the fourth valve port is connected with the first exhaust port; the second reversing component is provided with a fifth valve port, a sixth valve port, a seventh valve port and an eighth valve port, the fifth valve port is communicated with the sixth valve port or the eighth valve port, and the seventh valve port is communicated with the eighth valve port or the sixth valve port; the sixth valve port is connected with the second air suction port; the second exhaust port is connected with the eighth valve port and the first air suction port; the first end of the first indoor heat exchanger is connected with the first valve port; the first end of the second indoor heat exchanger is connected with the fifth valve port; the first end of the outdoor heat exchanger is connected with the third valve port and the seventh valve port.
Further, the compression assembly is a compressor, the compressor is a double-cylinder compressor, an upper cylinder of the double-cylinder compressor is a first compression part, and a lower cylinder of the double-cylinder compressor is a second compression part; or, the compression assembly includes two compressors, one compressor being a first compression portion and the other compressor being a second compression portion.
Further, the first reversing component is a four-way reversing valve; and/or the second reversing component is a four-way reversing valve.
Further, the air conditioning system further includes: the first end of the first connecting pipe is connected with the first end of the first indoor heat exchanger, and the second end of the first connecting pipe is connected with the first valve port; the first end of the second connecting pipe is connected with the second valve port, and the second end of the second connecting pipe is connected with the first air suction port.
Further, the air conditioning system further includes: the first end of the third connecting pipe is connected with the first end of the outdoor heat exchanger, and the second end of the third connecting pipe is connected with the third valve opening; and the first end of the fourth connecting pipe is connected with the first exhaust port, and the second end of the fourth connecting pipe is connected with the fourth valve port.
Further, the air conditioning system further includes: and the first end of the fifth connecting pipe is connected with the first end of the second indoor heat exchanger, and the second end of the fifth connecting pipe is connected with the fifth valve port.
Further, the air conditioning system further includes: a sixth connecting pipe, the first end of which is connected with the sixth valve port, and the second end of which is connected with the second air suction port; and a seventh connecting pipe, wherein the first end of the seventh connecting pipe is connected with the seventh valve port, and the second end of the seventh connecting pipe is connected with the first end of the outdoor heat exchanger.
Further, the air conditioning system further includes: and the first end of the eighth connecting pipe is connected with the eighth valve port, and the second end of the eighth connecting pipe is connected with the second exhaust port.
Further, the air conditioning system further includes: the first end of the first main pipe is connected with the second end of the outdoor heat exchanger; the first end of the first branch pipe is connected with the second end of the first main pipe, and the second end of the first branch pipe is connected with the second end of the first indoor heat exchanger; the first branch pipe is provided with a first throttling mechanism; the first end of the second branch pipe is connected with the second end of the first main pipe, and the second end of the second branch pipe is connected with the second end of the second indoor heat exchanger; the second branch pipe is provided with a second throttling mechanism.
Further, the air conditioning system further includes: a flash evaporator; the first end of the first pipeline is connected with the second end of the outdoor heat exchanger, and the second end of the first pipeline is connected with the flash evaporator; the first end of the second pipeline is connected with the flash evaporator, and the second end of the second pipeline is connected with the second end of the first indoor heat exchanger and the second end of the second indoor heat exchanger; and the first end of the third pipeline is connected with the flash evaporator, and the second end of the third pipeline is connected with the first air suction port.
Further, a third throttling mechanism is arranged on the first pipeline.
Further, a first end of the first pipeline is connected with the first main pipe, and a second end of the first pipeline is connected with the flash evaporator; the first end of the second pipeline is connected with the flash evaporator, and the second end of the second pipeline is connected with the second end of the first main pipe; the second pipeline is provided with a first control valve; the air conditioning system further includes: the second control valve is arranged on the first main pipe and is positioned at one side of the first pipeline away from the outdoor heat exchanger; the third control valve is arranged on the first branch pipe; the fourth control valve is arranged on the second branch pipe and is positioned between the second throttling mechanism and the second indoor heat exchanger; the first end of the fourth pipeline is connected with the second end of the first indoor heat exchanger, and the second end of the fourth pipeline is connected with the second branch pipe and is positioned between the second throttling mechanism and the fourth control valve; the fourth pipeline is provided with a fifth control valve.
Further, a first end of the third pipeline is connected with the flash evaporator, and a second end of the third pipeline is connected with the first air suction port; the third pipeline is provided with a sixth control valve.
Further, the air conditioning system further includes: a fifth pipeline, the first end of which is connected with the first connecting pipe, and the second end of which is connected with the fifth connecting pipe; a seventh control valve is arranged on the fifth pipeline; and an eighth control valve provided on the second connection pipe.
Further, the air conditioning system further includes: a sixth pipeline, the first end of which is connected with the second air outlet, and the second end of which is connected with the first air suction port; a ninth control valve is arranged on the sixth pipeline; and a tenth control valve provided on the eighth connection pipe.
Further, the air conditioning system further includes: a seventh pipe, the first end of which is connected with the second air suction port; the first three-way valve is arranged on the second connecting pipe, a first connecting port and a second connecting port of the first three-way valve are both positioned on the second connecting pipe, and a third connecting port of the first three-way valve is connected with the second end of the seventh pipeline; wherein the first connection port is selectively communicated with the second connection port or the third connection port.
Further, the air conditioning system further includes: an eighth pipeline; the second three-way valve is arranged on the eighth connecting pipe, the fourth connecting port and the fifth connecting port of the second three-way valve are both positioned on the eighth connecting pipe, and the sixth connecting port of the second three-way valve is connected with the first end of the eighth pipeline; wherein the fourth connection port is selectively communicated with the fifth connection port or the sixth connection port; the third three-way valve is arranged on the second connecting pipe and is positioned on one side of the first three-way valve away from the first reversing component, a seventh connecting port and an eighth connecting port of the third three-way valve are both positioned on the second connecting pipe, and a ninth connecting port of the third three-way valve is connected with the second end of the eighth pipeline; wherein the seventh connection port is selectively communicated with the eighth connection port or the ninth connection port.
Further, a first end of the third pipeline is connected with the flash evaporator, and a second end of the third pipeline is connected with the eighth pipeline.
Further, a first end of the first pipeline is connected with the first branch pipe and is positioned at one side of the first throttling mechanism away from the first main pipe, and a second end of the first pipeline is connected with the flash evaporator; a first valve is arranged on the first pipeline; the first end of the second pipeline is connected with the flash evaporator, and the second end of the second pipeline is connected with the second branch pipe and is positioned at one side of the second throttling mechanism far away from the second indoor heat exchanger; the air conditioning system further includes: a ninth pipeline, the first end of which is connected with the second branch pipe and is positioned at one side of the second throttling mechanism close to the second indoor heat exchanger; the fourth three-way valve is arranged on the first branch pipe, a tenth connecting port and an eleventh connecting port of the fourth three-way valve are both positioned on the first branch pipe, and the twelfth connecting port of the fourth three-way valve is connected with the second end of the ninth pipeline; wherein the tenth connection port is selectively communicated with the eleventh connection port or the twelfth connection port; the second valve is arranged on the second branch pipe and is positioned at one side of the second pipeline far away from the second throttling mechanism.
Further, when the air conditioning system is in a refrigeration and dehumidification mode and is in a rated refrigeration working condition, the flow rate of the refrigerant flowing through the first indoor heat exchanger is q1, and the flow rate of the refrigerant flowing through the second indoor heat exchanger is q2; the ratio of q1 to (q1+q2) ranges from 10% to 30%.
Further, when the air conditioning system is in the cooling and dehumidifying mode and is in the intermediate cooling condition, the flow rate of the refrigerant flowing through the first indoor heat exchanger is q1, the flow rate of the refrigerant flowing through the second indoor heat exchanger is q2, and the ratio of q1 to (q1+q2) is in the range of 1% -6%.
According to another aspect of the present invention, there is provided a control method of an air conditioning system, the control method of the air conditioning system including: controlling the air conditioning system to enter a refrigeration and dehumidification mode; the cooling and dehumidifying modes include: after the first compression part of the compression assembly of the air conditioning system compresses the refrigerant discharged by the first indoor heat exchanger of the air conditioning system, the refrigerant enters the outdoor heat exchanger of the air conditioning system; the second compression part of the compression assembly compresses the refrigerant discharged by the second indoor heat exchanger of the air conditioning system, and then the refrigerant enters the outdoor heat exchanger; part of the refrigerant flowing out of the outdoor heat exchanger flows through the first indoor heat exchanger to dehumidify the indoor air, and part of the refrigerant flowing out of the outdoor heat exchanger flows through the second indoor heat exchanger to refrigerate the indoor air; or, controlling the air conditioning system to enter a refrigeration mode; the cooling mode includes: the second compression part performs primary compression on the refrigerant discharged by the first indoor heat exchanger and the refrigerant of the second indoor heat exchanger, and then the refrigerant enters the first compression part for secondary compression; the refrigerant discharged by the first compression part passes through the outdoor heat exchanger and then enters the first indoor heat exchanger and the second indoor heat exchanger respectively to exchange heat with indoor air; or controlling the air conditioning system to enter a first heating mode; the first heating mode includes: the second compression part performs primary compression on the refrigerant discharged by the outdoor heat exchanger, and then the refrigerant enters the first compression part for secondary compression; the refrigerant discharged from the first compression part flows into the outdoor heat exchanger after exchanging heat with indoor air through the first indoor heat exchanger and the second indoor heat exchanger respectively; or controlling the air conditioning system to enter a second heating mode; the second heating mode includes: the second compression part performs primary compression on the refrigerant discharged by the outdoor heat exchanger, and then the refrigerant enters the first compression part for secondary compression; the refrigerant discharged from the first compression part flows into the outdoor heat exchanger after exchanging heat with indoor air through the first indoor heat exchanger; or controlling the air conditioning system to enter a third heating mode; the third heating mode includes: the first compression part compresses part of the refrigerant discharged by the outdoor heat exchanger, and then the refrigerant enters the first indoor heat exchanger to exchange heat with indoor air; the second compression part compresses part of the refrigerant discharged by the outdoor heat exchanger, and then the refrigerant enters the second indoor heat exchanger to exchange heat with indoor air; the refrigerant discharged from the first indoor heat exchanger and the second indoor heat exchanger flows into the outdoor heat exchanger.
Further, the cooling and dehumidifying modes include: the first valve port and the second valve port of the first reversing component of the air conditioning system are controlled to be communicated, and the fourth valve port and the third valve port of the first reversing component are controlled to be communicated; the fifth valve port and the sixth valve port of the second reversing component of the air conditioning system are controlled to be communicated, and the seventh valve port and the eighth valve port of the second reversing component are controlled to be communicated; the second control valve, the third control valve, the fourth control valve, the eighth control valve and the tenth control valve of the air conditioning system are controlled to be opened, and the first control valve, the fifth control valve, the sixth control valve, the seventh control valve and the ninth control valve of the air conditioning system are controlled to be closed.
Further, the cooling mode includes: the first valve port and the second valve port of the first reversing component of the air conditioning system are controlled to be communicated, and the fourth valve port and the third valve port of the first reversing component are controlled to be communicated; the fifth valve port and the sixth valve port of the second reversing component of the air conditioning system are controlled to be communicated, and the seventh valve port and the eighth valve port of the second reversing component are controlled to be communicated; the second control valve, the third control valve, the eighth control valve and the tenth control valve of the air conditioning system are closed, and the first control valve, the fourth control valve, the fifth control valve, the sixth control valve, the seventh control valve and the ninth control valve of the air conditioning system are opened.
Further, the first heating mode includes: the first valve port and the fourth valve port of the first reversing component of the air conditioning system are controlled to be communicated, and the second valve port and the third valve port of the first reversing component are controlled to be communicated; the fifth valve port and the eighth valve port of the second reversing component of the air conditioning system are controlled to be communicated, and the sixth valve port and the seventh valve port of the second reversing component are controlled to be communicated; the second control valve, the third control valve, the eighth control valve and the tenth control valve of the air conditioning system are closed, and the first control valve, the fourth control valve, the fifth control valve, the sixth control valve, the seventh control valve and the ninth control valve of the air conditioning system are opened.
Further, the second heating mode includes: the first valve port and the fourth valve port of the first reversing component of the air conditioning system are controlled to be communicated, and the second valve port and the third valve port of the first reversing component are controlled to be communicated; the fifth valve port and the eighth valve port of the second reversing component of the air conditioning system are controlled to be communicated, and the sixth valve port and the seventh valve port of the second reversing component are controlled to be communicated; the second control valve, the third control valve, the fourth control valve, the fifth control valve, the seventh control valve, the eighth control valve and the tenth control valve of the air conditioning system are closed, and the first control valve, the sixth control valve and the ninth control valve of the air conditioning system are opened.
Further, the third heating mode includes: the first valve port and the fourth valve port of the first reversing component of the air conditioning system are controlled to be communicated, and the second valve port and the third valve port of the first reversing component are controlled to be communicated; the fifth valve port and the eighth valve port of the second reversing component of the air conditioning system are controlled to be communicated, and the sixth valve port and the seventh valve port of the second reversing component are controlled to be communicated; the second control valve, the third control valve, the fourth control valve, the fifth control valve, the seventh control valve, the eighth control valve and the tenth control valve of the air conditioning system are controlled to be opened, and the first control valve, the sixth control valve and the ninth control valve of the air conditioning system are controlled to be closed.
According to the air conditioning system, the first compression part and the second compression part are arranged to realize single-stage and double-stage compression of the refrigerant, so that the requirements of different operation pressure ratios are met; the switching between refrigeration and heating is realized by arranging a first reversing component and a second reversing component; the refrigeration and the initial separation treatment can be realized by arranging two indoor heat exchangers, and the change of the heat exchange area can be realized; the air conditioning system can further realize the switching of five operation modes, including a double-evaporator double-cylinder single-stage operation mode, a double-evaporator double-cylinder double-stage air supplementing mode, a double-condenser double-cylinder double-stage air supplementing mode, a single-condenser double-cylinder double-stage air supplementing mode and a double-condenser double-cylinder single-stage mode, so that the most economical operation state of the system is ensured when the refrigerating and heating functions are realized in a region with changeable climates.
Drawings
The accompanying drawings, which 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 description serve to explain the invention. In the drawings:
fig. 1 shows a schematic view of a first embodiment of an air conditioning system according to the present invention;
FIG. 2 is a schematic diagram of the air conditioning system of FIG. 1 in a cooling and dehumidification mode;
fig. 3 shows a pressure-enthalpy diagram of an air conditioning system according to the invention in a cooling and dehumidifying mode;
FIG. 4 shows a graph of the total flow ratio (q 1/(q1+q2)) of the dehumidification flow path refrigerant flow to the system energy efficiency ratio (E) under rated refrigeration conditions;
FIG. 5 is a schematic diagram of the air conditioning system of FIG. 1 in a cooling and mode;
FIG. 6 shows a schematic diagram of the air conditioning system of FIG. 1 in a first heating mode;
FIG. 7 shows a schematic diagram of the air conditioning system of FIG. 1 in a second heating mode;
FIG. 8 shows a schematic diagram of the air conditioning system of FIG. 1 in a third heating mode;
fig. 9 shows a schematic view of a second embodiment of an air conditioning system according to the present invention.
Wherein the above figures include the following reference numerals:
10. A compression assembly; 11. a first compression section; 12. a second compression section; 20. an outdoor heat exchanger; 30. a first indoor heat exchanger; 40. a second indoor heat exchanger; 50. a first reversing component; 51. a first valve port; 52. a second valve port; 53. a third valve port; 54. a fourth valve port; 60. a first connection pipe; 70. a second connection pipe; 80. a third connection pipe; 90. a fourth connection pipe; 100. a second reversing component; 101. a fifth valve port; 102. a sixth valve port; 103. a seventh valve port; 104. an eighth valve port; 110. a fifth connection pipe; 120. a sixth connection pipe; 130. a seventh connection pipe; 140. an eighth connection pipe; 150. a first manifold; 160. a first branch pipe; 170. a second branch pipe; 180. a first throttle mechanism; 190. a second throttle mechanism; 200. a flash evaporator; 210. a first pipeline; 220. a second pipeline; 230. a third pipeline;
240. a third throttle mechanism; 250. a first control valve; 260. a second control valve; 270. a third control valve; 280. a fourth control valve; 290. a fourth pipeline; 300. a fifth control valve; 310. a sixth control valve; 320. a fifth pipeline; 330. a seventh control valve; 340. an eighth control valve; 350. a sixth pipeline; 360. a ninth control valve; 370. a tenth control valve;
380. A seventh pipeline; 390. a first three-way valve; 391. a first connection port; 392. a second connection port; 393. a third connection port; 400. an eighth pipeline; 410. a second three-way valve; 411. a fourth connection port; 412. a fifth connection port; 413. a sixth connection port; 420. a third three-way valve; 421. a seventh connection port; 422. an eighth connection port; 423. a ninth connection port; 430. a first valve; 440. a ninth pipeline; 450. a fourth three-way valve; 451. a tenth connection port; 452. an eleventh connection port; 453. a twelfth connection port; 460. and a second valve.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Technical problem that this application solved: the circulation mode of the air conditioning system in the prior art cannot ensure that the system is always in the most economical running state when the refrigerating/heating problem is realized in regions with changeable climates throughout the year.
The present invention provides an air conditioning system, please refer to fig. 1 to 9, comprising: a compression assembly 10 including a first compression part 11 and a second compression part 12, the first compression part 11 having a first suction port and a first discharge port, the second compression part 12 having a second suction port and a second discharge port; the first reversing component 50 is used for switching the cooling and heating of the air conditioning system, and the first reversing component 50 is connected with the first air suction port and the first air exhaust port; the second reversing component 100 is used for switching the cooling and heating of the air conditioning system, and the second reversing component 100 is connected with the second air suction port; the second exhaust port is connected with the second reversing component 100 and the first air suction port; a first indoor heat exchanger 30, a first end of the first indoor heat exchanger 30 being connected to the first reversing member 50; a second indoor heat exchanger 40, a first end of the second indoor heat exchanger 40 being connected to the second reversing member 100; the outdoor heat exchanger 20, a first end of the outdoor heat exchanger 20 is connected to both the first reversing member 50 and the second reversing member 100, and a second end of the outdoor heat exchanger 20 is connected to both the second end of the first indoor heat exchanger 30 and the second end of the second indoor heat exchanger 40.
The air conditioning system realizes single-stage and double-stage compression of the refrigerant by arranging the first compression part 11 and the second compression part 12, thereby meeting the requirements of different operation pressure ratios; the switching between cooling and heating is achieved by providing the first reversing element 50 and the second reversing element 100; the two indoor heat exchangers are arranged to separate refrigeration and dehumidification, and the change of heat exchange area can be realized; the air conditioning system can further realize the switching of five operation modes, including a double-evaporator double-cylinder single-stage operation mode, a double-evaporator double-cylinder double-stage air supplementing mode, a double-condenser double-cylinder double-stage air supplementing mode, a single-condenser double-cylinder double-stage air supplementing mode and a double-condenser double-cylinder single-stage mode, so that the most economical operation state of the system is ensured when the refrigerating and heating functions are realized in a region with changeable climates.
In the present embodiment, the first reversing element 50 has a first valve port 51, a second valve port 52, a third valve port 53, and a fourth valve port 54, the first valve port 51 communicates with the second valve port 52 or the fourth valve port 54, and the third valve port 53 communicates with the fourth valve port 54 or the second valve port 52; the second valve port 52 is connected with the first air suction port; the fourth valve port 54 is connected to the first exhaust port; the second reversing element 100 has a fifth port 101, a sixth port 102, a seventh port 103, and an eighth port 104, the fifth port 101 being in communication with the sixth port 102 or the eighth port 104, the seventh port 103 being in communication with the eighth port 104 or the sixth port 102; the sixth valve port 102 is connected with the second air suction port; the second exhaust port is connected with the eighth valve port 104 and the first air suction port; a first end of the first indoor heat exchanger 30 is connected to the first valve port 51; the first end of the second indoor heat exchanger 40 is connected with the fifth valve port 101; the first end of the outdoor heat exchanger 20 is connected to both the third valve port 53 and the seventh valve port 103.
In this embodiment, the compression assembly 10 is a compressor, the compressor is a double-cylinder compressor, an upper cylinder of the double-cylinder compressor is a first compression part 11, and a lower cylinder of the double-cylinder compressor is a second compression part 12; alternatively, the compression assembly 10 includes two compressors, one compressor being the first compression portion 11 and the other compressor being the second compression portion 12.
In this embodiment, the first reversing element 50 is a four-way reversing valve; and/or the second reversing component 100 is a four-way reversing valve.
In this embodiment, the air conditioning system further includes: a first connection pipe 60, a first end of the first connection pipe 60 being connected to a first end of the first indoor heat exchanger 30, a second end of the first connection pipe 60 being connected to the first valve port 51; a third connection pipe 80, a first end of the third connection pipe 80 being connected to a first end of the outdoor heat exchanger 20, and a second end of the third connection pipe 80 being connected to the third valve port 53; a fourth connection pipe 90, a first end of the fourth connection pipe 90 being connected to the first exhaust port, and a second end of the fourth connection pipe 90 being connected to the fourth valve port 54; a fifth connection pipe 110, a first end of the fifth connection pipe 110 being connected to a first end of the second indoor heat exchanger 40, a second end of the fifth connection pipe 110 being connected to the fifth valve port 101; a sixth connection pipe 120, a first end of the sixth connection pipe 120 being connected to the sixth valve port 102, a second end of the sixth connection pipe 120 being connected to the second suction port; the seventh connection pipe 130, the first end of the seventh connection pipe 130 is connected to the seventh valve port 103, and the second end of the seventh connection pipe 130 is connected to the first end of the outdoor heat exchanger 20.
In this embodiment, the air conditioning system further includes: and a second connection pipe 70, a first end of the second connection pipe 70 being connected to the second valve port 52, and a second end of the second connection pipe 70 being connected to the first suction port.
In this embodiment, the air conditioning system further includes: and an eighth connection pipe 140, a first end of the eighth connection pipe 140 being connected to the eighth valve port 104, and a second end of the eighth connection pipe 140 being connected to the second exhaust port.
In this embodiment, the air conditioning system further includes: a first bus 150, a first end of the first bus 150 being connected to a second end of the outdoor heat exchanger 20; a first branch pipe 160, a first end of the first branch pipe 160 being connected to a second end of the first header 150, and a second end of the first branch pipe 160 being connected to a second end of the first indoor heat exchanger 30; the first branch pipe 160 is provided with a first throttle mechanism 180; a second branch pipe 170, a first end of the second branch pipe 170 being connected to a second end of the first header 150, a second end of the second branch pipe 170 being connected to a second end of the second indoor heat exchanger 40; the second branch pipe 170 is provided with a second throttle mechanism 190.
In this embodiment, the air conditioning system further includes: flash vessel 200; a first pipe 210, a first end of the first pipe 210 being connected to a second end of the outdoor heat exchanger 20, a second end of the first pipe 210 being connected to the flash evaporator 200; a second pipe 220, a first end of the second pipe 220 being connected to the flash evaporator 200, a second end of the second pipe 220 being connected to both the second end of the first indoor heat exchanger 30 and the second end of the second indoor heat exchanger 40; and a third pipe 230, a first end of the third pipe 230 is connected to the flash evaporator 200, and a second end of the third pipe 230 is connected to the first suction port.
In the first embodiment, a third throttle mechanism 240 is provided on the first pipe 210.
In a first embodiment, a first end of first conduit 210 is connected to first manifold 150 and a second end of first conduit 210 is connected to flash vessel 200; a first end of the second pipe 220 is connected to the flash evaporator 200, and a second end of the second pipe 220 is connected to a second end of the first bus 150; the second pipeline 220 is provided with a first control valve 250; the air conditioning system further includes: a second control valve 260 provided on the first manifold 150 at a side of the first pipe 210 remote from the outdoor heat exchanger 20; a third control valve 270 provided on the first branch pipe 160; a fourth control valve 280 provided on the second branch pipe 170 between the second throttle mechanism 190 and the second indoor heat exchanger 40; a fourth pipe 290, a first end of the fourth pipe 290 being connected to the second end of the first indoor heat exchanger 30, a second end of the fourth pipe 290 being connected to the second branch pipe 170 and being located between the second throttling mechanism 190 and the fourth control valve 280; a fifth control valve 300 is provided on the fourth line 290.
In the first embodiment, a first end of the third pipe 230 is connected to the flash evaporator 200, and a second end of the third pipe 230 is connected to the first suction port; a sixth control valve 310 is provided in the third line 230.
In a first embodiment, the air conditioning system further comprises: a fifth pipe 320, a first end of the fifth pipe 320 being connected to the first connection pipe 60, and a second end of the fifth pipe 320 being connected to the fifth connection pipe 110; the fifth pipeline 320 is provided with a seventh control valve 330; the eighth control valve 340 is provided on the second connection pipe 70.
In a first embodiment, the air conditioning system further comprises: a sixth pipe 350, a first end of the sixth pipe 350 being connected to the second air outlet, a second end of the sixth pipe 350 being connected to the first air inlet; a ninth control valve 360 is provided on the sixth conduit 350; the tenth control valve 370 is provided on the eighth connection pipe 140.
Specifically, the second end of the third pipe 230 is connected to the second connection pipe 70 and is located at a side of the eighth control valve 340 remote from the first reversing component 50; a first end of the sixth pipe 350 is connected to the eighth connection pipe 140, and a second end of the sixth pipe 350 is connected to the third pipe 230 and is located at a side of the sixth control valve 310 remote from the flash evaporator 200.
Optionally, the first control valve 250, the second control valve 260, the third control valve 270, the fourth control valve 280, the fifth control valve 300, the sixth control valve 310, the seventh control valve 330, the eighth control valve 340, the ninth control valve 360 and the tenth control valve 370 are all shut-off valves.
In a second embodiment, the air conditioning system further includes: a seventh pipe 380, a first end of the seventh pipe 380 being connected to the second suction port; the first three-way valve 390, the first three-way valve 390 is disposed on the second connecting pipe 70, the first connecting port 391 and the second connecting port 392 of the first three-way valve 390 are both disposed on the second connecting pipe 70, the third connecting port 393 of the first three-way valve 390 is connected with the second end of the seventh pipeline 380; wherein the first connection port 391 is selectively communicated with the second connection port 392 or the third connection port 393.
In a second embodiment, the air conditioning system further includes: eighth conduit 400; the second three-way valve 410, the second three-way valve 410 is disposed on the eighth connection pipe 140, the fourth connection port 411 and the fifth connection port 412 of the second three-way valve 410 are both disposed on the eighth connection pipe 140, and the sixth connection port 413 of the second three-way valve 410 is connected to the first end of the eighth pipeline 400; wherein the fourth connection port 411 is selectively connected to the fifth connection port 412 or the sixth connection port 413; the third three-way valve 420, the third three-way valve 420 is disposed on the second connection pipe 70 and is located at a side of the first three-way valve 390 away from the first reversing component 50, the seventh connection port 421 and the eighth connection port 422 of the third three-way valve 420 are both located on the second connection pipe 70, and the ninth connection port 423 of the third three-way valve 420 is connected with the second end of the eighth pipeline 400; the seventh connection port 421 is selectively connected to the eighth connection port 422 or the ninth connection port 423.
In a second embodiment, a first end of the third line 230 is connected to the flash vessel 200 and a second end of the third line 230 is connected to the eighth line 400.
In the second embodiment, a first end of the first pipe 210 is connected to the first branch pipe 160 and is located at a side of the first throttle mechanism 180 remote from the first header 150, and a second end of the first pipe 210 is connected to the flash evaporator 200; the first pipeline 210 is provided with a first valve 430; a first end of the second pipe 220 is connected to the flash evaporator 200, and a second end of the second pipe 220 is connected to the second branch pipe 170 and is located at a side of the second throttling mechanism 190 away from the second indoor heat exchanger 40; the air conditioning system further includes: a ninth pipe 440, a first end of the ninth pipe 440 being connected to the second branch pipe 170 and being located at a side of the second throttling mechanism 190 close to the second indoor heat exchanger 40; a fourth three-way valve 450, the fourth three-way valve 450 being disposed on the first branch pipe 160, the tenth connection port 451 and the eleventh connection port 452 of the fourth three-way valve 450 being disposed on the first branch pipe 160, the twelfth connection port 453 of the fourth three-way valve 450 being connected to the second end of the ninth pipeline 440; wherein the tenth connection port 451 is selectively communicated with the eleventh connection port 452 or the twelfth connection port 453; a second valve 460 is disposed on the second leg 170 on a side of the second conduit 220 remote from the second throttling mechanism 190.
Optionally, the first valve 430 and the second valve 460 are both shut-off valves.
In the present embodiment, when the air conditioning system is in the cooling and dehumidifying mode and is in the rated cooling condition, the flow rate of the refrigerant flowing through the first indoor heat exchanger 30 is q1, and the flow rate of the refrigerant flowing through the second indoor heat exchanger 40 is q2; the ratio of q1 to (q1+q2) ranges from 10% to 30%. Preferably, the ratio of q1 to (q1+q2) ranges from 17% to 25%.
In this embodiment, when the air conditioning system is in the cooling and dehumidifying mode and is in the intermediate cooling condition, the flow rate of the refrigerant flowing through the first indoor heat exchanger 30 is q1, the flow rate of the refrigerant flowing through the second indoor heat exchanger 40 is q2, and the ratio of q1 to (q1+q2) is in the range of 1% -6%. Preferably, the ratio of q1 to (q1+q2) ranges from 1.0% to 3.5%.
The humidity in early summer is high, the traditional fresh air conditioner needs lower evaporation temperature to meet the dehumidification requirement, but the evaporation temperature is reduced firstly, for a compressor, the pressure ratio is increased, the operation is uneconomical, and the reduction of the evaporation temperature leads to the reduction of the air outlet temperature of the indoor unit, so that the human body comfort is reduced; the device is suitable for separately treating cooling and dehumidifying in the occasions, directly realizes two evaporating temperatures of cooling and dehumidifying, improves the evaporating temperature for realizing the refrigerating function, reduces the pressure ratio and improves the energy efficiency of the system. However, in the summer season, the outdoor temperature is higher, under the operation working condition of relatively high pressure, the single-stage circulation system with double evaporation temperatures is uneconomical to operate, the energy efficiency of the two-stage compression system is higher, meanwhile, the operation load is relatively high under the working condition, and the area of the heat exchanger is increased, so that the energy efficiency of the system can be improved. Meanwhile, in the winter, the system operation working condition pressure is smaller and the load is smaller, the requirement can be met by adopting a single-stage compression system and a smaller heat exchanger, but in the winter, the outdoor temperature is extremely low, the system operation pressure ratio is large, the problems of low volumetric efficiency, overhigh exhaust temperature and the like exist in single-stage compression, and the problems can be well solved by double-stage compression, so that the system is in a high-efficiency operation state. Meanwhile, the operation load is larger in severe winter, and the heat exchanger area is increased, so that the energy efficiency of the system can be improved. Therefore, it is needed to develop an air conditioning system with single/double-stage switching and variable heat exchanger area, so that the system meets the requirements of regions with varied climates all the year round, and the system is ensured to be always in the most economical running state.
The beneficial effects of this application: an air conditioning system device capable of automatically switching single/double stages and adjusting the area of a heat exchanger according to the load, namely an air conditioning system with multi-mode operation is provided. The air conditioning system can realize the switching of five operation modes through the switching of the stop valve and the cooperation of the compression assembly, and can ensure that the system is always in the most economical operation state when the refrigerating/heating function is realized in the region with changeable climate.
The air conditioning system realizes the switching of five operation modes through the switching of the stop valve and the cooperation of the compression assembly, and comprises a double-evaporator double-cylinder single-stage operation mode (namely a refrigerating mode and a dehumidifying mode), a double-evaporator double-cylinder double-stage air supplementing mode (namely a refrigerating mode), a double-condenser double-cylinder double-stage air supplementing mode (namely a first heating mode), a single-condenser double-cylinder double-stage air supplementing mode (namely a second heating mode) and a double-condenser double-cylinder single-stage mode (namely a second heating mode).
Further, in the refrigerating and dehumidifying mode of the air conditioning system, the percentage range of the refrigerant flow q2 of the dehumidifying flow path to the total flow (q1+q2) when the air conditioning system obtains the optimal energy efficiency ratio under different operation conditions is specified, for example, the system has the optimal energy efficiency ratio when the ratio of q2 to (q1+q2) is between 10% and 30% under the rated refrigerating condition, the operation is more economical (see figure 4), and the energy efficiency ratio is optimal when the ratio is between 17% and 25%; under the intermediate refrigeration working condition, the system has better energy efficiency ratio when the ratio of q2 to (q1+q2) is in the range of 1.0-6%, and has the optimal energy efficiency ratio when the ratio is in the range of 1.0-3.5%.
In a first embodiment, the air conditioning system includes a compression assembly, three heat exchangers, two four-way reversing valves, three throttle mechanisms, and ten shut-off valves. The compression assembly can be a multi-cylinder compressor capable of realizing single-stage and double-stage switching or a plurality of compressors. The heat exchangers are two indoor heat exchangers and one outdoor heat exchanger; the four-way reversing valve is responsible for refrigerating and heating switching; the throttling mechanism is responsible for throttling the high pressure to the medium pressure or throttling the high pressure from the medium pressure to the low pressure; the stop valve cooperates with the compression assembly to switch between multiple modes of operation.
The invention also provides a control method of an air conditioning system, please refer to fig. 1 to 9, which is applied to the air conditioning system in the above embodiment, and the control method of the air conditioning system comprises: controlling the air conditioning system to enter a refrigeration and dehumidification mode; the cooling and dehumidifying modes include: the first compression part 11 of the compression assembly 10 of the air conditioning system compresses the refrigerant discharged from the first indoor heat exchanger 30 of the air conditioning system and then makes the refrigerant enter the outdoor heat exchanger 20 of the air conditioning system; the second compression part 12 of the compression assembly 10 compresses the refrigerant discharged from the second indoor heat exchanger 40 of the air conditioning system and then causes the refrigerant to enter the outdoor heat exchanger 20; part of the refrigerant flowing out of the outdoor heat exchanger 20 flows through the first indoor heat exchanger 30 to dehumidify the indoor air, and part of the refrigerant flowing out of the outdoor heat exchanger 20 flows through the second indoor heat exchanger 40 to cool the indoor air; or, controlling the air conditioning system to enter a refrigeration mode; the cooling mode includes: the second compression unit 12 performs first-stage compression on the refrigerant discharged from the first indoor heat exchanger 30 and the refrigerant discharged from the second indoor heat exchanger 40, and then causes the refrigerant to enter the first compression unit 11 for second-stage compression; the refrigerant discharged from the first compression part 11 passes through the outdoor heat exchanger 20 and then enters the first indoor heat exchanger 30 and the second indoor heat exchanger 40 to exchange heat with indoor air; or controlling the air conditioning system to enter a first heating mode; the first heating mode includes: the second compression unit 12 performs first-stage compression on the refrigerant discharged from the outdoor heat exchanger 20, and then causes the refrigerant to enter the first compression unit 11 for second-stage compression; the refrigerant discharged from the first compression part 11 flows into the outdoor heat exchanger 20 after exchanging heat with indoor air through the first indoor heat exchanger 30 and the second indoor heat exchanger 40, respectively; or controlling the air conditioning system to enter a second heating mode; the second heating mode includes: the second compression unit 12 performs first-stage compression on the refrigerant discharged from the outdoor heat exchanger 20, and then causes the refrigerant to enter the first compression unit 11 for second-stage compression; the refrigerant discharged from the first compression part 11 flows into the outdoor heat exchanger 20 after exchanging heat with indoor air through the first indoor heat exchanger 30; or controlling the air conditioning system to enter a third heating mode; the third heating mode includes: the first compression unit 11 compresses a part of the refrigerant discharged from the outdoor heat exchanger 20, and then causes the refrigerant to enter the first indoor heat exchanger 30 to exchange heat with indoor air; the second compression unit 12 compresses a part of the refrigerant discharged from the outdoor heat exchanger 20, and then causes the refrigerant to enter the second indoor heat exchanger 40 to exchange heat with indoor air; the refrigerant discharged from the first indoor heat exchanger 30 and the second indoor heat exchanger 40 flows into the outdoor heat exchanger 20.
As shown in fig. 1, the air conditioning system can meet the requirements of regions with changeable climates all the year round by single/double-stage automatic conversion and adjusting the area of the heat exchanger according to the load, and the system is ensured to be always in the most economical running state. The present application describes a twin-cylinder compressor as an example.
In a first embodiment, as shown in fig. 2, the cooling and dehumidifying modes include: the first valve port 51 and the second valve port 52 of the first reversing component 50 of the control air conditioning system are communicated, and the fourth valve port 54 and the third valve port 53 of the first reversing component 50 are controlled to be communicated; the fifth valve port 101 and the sixth valve port 102 of the second reversing element 100 of the control air conditioning system are communicated, and the seventh valve port 103 and the eighth valve port 104 of the second reversing element 100 are controlled to be communicated; the second, third, fourth, eighth, and tenth control valves 260, 270, 280, 340, and 370, which control the air conditioning system, are opened, and the first, fifth, sixth, seventh, and ninth control valves 250, 300, 310, 330, and 360, which control the air conditioning system, are closed.
Specifically, the air conditioning system is in a refrigeration and dehumidification mode, so that double evaporation temperatures can be realized, the compressor is in a double-cylinder single-stage operation mode, the first indoor heat exchanger 30 realizes lower evaporation temperature, the second indoor heat exchanger 40 realizes higher evaporation temperature, the first indoor heat exchanger 30 with lower evaporation temperature bears latent heat load, the dehumidification function is mainly realized, the second indoor heat exchanger 40 with higher evaporation temperature bears sensible heat load, the refrigeration function is mainly realized, and the air side of the second indoor heat exchanger 40 is subjected to heat exchange with small enthalpy difference, so that the efficiency of the pressure ratio small system can be remarkably improved. The refrigerant in the second indoor heat exchanger 40 is absorbed by the lower cylinder of the compressor through the second reversing element 100, and as shown in fig. 3, the refrigerant has a pressure P2 and a temperature T2, and is compressed into a refrigerant having a pressure P4 and a temperature T4 in the lower cylinder; the refrigerant in the first indoor heat exchanger 30 is absorbed by the upper cylinder of the compressor through the first reversing element 50, and the refrigerant has a pressure P1 and a temperature T1 (where T2> T1) and is compressed into a refrigerant having a pressure P4 and a temperature T3. The pressure is P2, the temperature is T2, the refrigerant flow q2 is greater than P1, the temperature is T1, the refrigerant flow q1 of the dehumidification flow path accounts for different percentage ranges of the total flow (q1+q2) when the air conditioning system under different operation conditions obtains the optimal energy efficiency ratio, for example, the system has the optimal energy efficiency ratio when the ratio of q1 to (q1+q2) is between 10% and 30% under the rated refrigeration condition, the air conditioning system has the optimal energy efficiency ratio when the ratio is between 17% and 25% and the air conditioning system has the optimal energy efficiency ratio when the ratio of q1 to (q1+q2) is between 1% and 6% under the middle refrigeration condition, and the air conditioning system has the optimal energy efficiency ratio when the ratio is between 1.0% and 3.5%. The refrigerant with the pressure of P4 and the temperature of T3 and the refrigerant with the pressure of P4 and the temperature of T3 respectively enter a condenser (namely an outdoor heat exchanger 20) through a second reversing component 100 and a first reversing component 50, are condensed and cooled into a high-temperature high-pressure liquid refrigerant through the condenser, are divided into two paths through the refrigerant of a second control valve 260, and one path is throttled into the refrigerant with the pressure of P6 and the temperature of T6 through a second throttling mechanism 190 and then enters a second indoor heat exchanger 40, absorbs heat and evaporates into the refrigerant with the pressure of P2 and the temperature of T2, and is sucked away by a lower cylinder of the compressor; the other path is throttled and depressurized by the first throttling mechanism 180 to form a refrigerant with the pressure of P7 and the temperature of T7, and the refrigerant enters the first indoor heat exchanger 30 which is responsible for dehumidification and absorbs heat to evaporate to form a refrigerant with the pressure of P1 and the temperature of T1, and then the refrigerant is sucked by the upper cylinder of the compressor, so that the whole system circulation process is completed. When the circulation type is used in early summer with high humidity, refrigeration and dehumidification can be separately processed, two evaporation temperatures of refrigeration and dehumidification can be directly realized, the evaporation temperature for realizing a refrigeration function is improved, the pressure ratio is reduced, and the energy efficiency of the system is improved.
In a first embodiment, as shown in fig. 5, the cooling mode includes: the first valve port 51 and the second valve port 52 of the first reversing component 50 of the control air conditioning system are communicated, and the fourth valve port 54 and the third valve port 53 of the first reversing component 50 are controlled to be communicated; the fifth valve port 101 and the sixth valve port 102 of the second reversing element 100 of the control air conditioning system are communicated, and the seventh valve port 103 and the eighth valve port 104 of the second reversing element 100 are controlled to be communicated; the second, third, eighth and tenth control valves 260, 270, 340 and 370 controlling the air conditioning system are closed, and the first, fourth, fifth, sixth, seventh and ninth control valves 250, 280, 300, 310, 330 and 360 controlling the air conditioning system are opened.
Specifically, the air conditioning system is in a cooling mode, the compressor is in a two-cylinder two-stage air-make-up operation mode, the refrigerant in the second indoor heat exchanger 40 and the refrigerant in the first indoor heat exchanger 30 are sucked by the lower cylinder of the compressor through the second reversing component 100, the refrigerant is compressed into medium-pressure refrigerant with the pressure of P2 and the temperature of T2 in the lower cylinder at the pressure of P1 and the temperature of T1, and the medium-pressure refrigerant is mixed with the gas refrigerant separated in the flash evaporator to enter the upper cylinder for high-pressure stage compression, is further compressed to the condensation pressure Pk through the high-pressure stage, and then enters the condenser (i.e. the outdoor heat exchanger 20) through the first reversing component 50 for cooling, condensation and supercooling. The cooled liquid refrigerant enters a flash evaporator after being throttled and depressurized into medium-pressure refrigerant by a third throttling mechanism 240, and gas separated in the flash evaporator is used as intermediate air supplementing by a sixth control valve 310 to be mixed with the refrigerant with the pressure of P2 and the temperature of T2 and enters an upper cylinder to be compressed at a high pressure level, so that high-pressure level air suction is cooled, the high-pressure level compression process is optimized, and the exhaust temperature is reduced; the liquid separated in the flash evaporator is throttled and depressurized into a low-temperature low-pressure refrigerant by the second throttling mechanism 190, and then enters the first indoor heat exchanger 30 and the second indoor heat exchanger 40 through the fifth control valve 300 and the fourth control valve 280 respectively to absorb heat and evaporate into a low-temperature low-pressure gaseous refrigerant, and then is sucked and compressed by the lower cylinder, so that the whole system circulation process is completed. In the midsummer season, the outdoor temperature is higher, the pressure ratio is large, the load is high, the two-stage compression mode can decompose the pressure ratio, the volumetric efficiency is improved, and the exhaust temperature is reduced; meanwhile, the load is large, and the circulating device is provided with two indoor evaporators, so that the system can obtain higher energy efficiency.
In a first embodiment, as shown in fig. 6, the first heating mode includes: the first valve port 51 and the fourth valve port 54 of the first reversing element 50 of the control air conditioning system are communicated, and the second valve port 52 and the third valve port 53 of the first reversing element 50 are controlled to be communicated; the fifth valve port 101 and the eighth valve port 104 of the second reversing element 100 of the control air conditioning system are communicated, and the sixth valve port 102 and the seventh valve port 103 of the second reversing element 100 are controlled to be communicated; the second, third, eighth and tenth control valves 260, 270, 340 and 370 controlling the air conditioning system are closed, and the first, fourth, fifth, sixth, seventh and ninth control valves 250, 280, 300, 310, 330 and 360 controlling the air conditioning system are opened.
Specifically, the air conditioning system is in a first heating mode, the compressor is in a double-cylinder double-stage operation mode, the low-temperature low-pressure refrigerant in the evaporator (i.e. the outdoor heat exchanger 20) is absorbed by the lower cylinder of the compressor through the second reversing component 100, the refrigerant is at the pressure P1 and the temperature T1, the refrigerant is compressed into the medium-pressure refrigerant at the pressure P2 and the temperature T2 in the lower cylinder, then the medium-pressure refrigerant is mixed with the gas refrigerant separated from the flash evaporator through the ninth control valve 360 and enters the upper cylinder to be compressed at a high pressure level, the high-pressure compressed is further compressed to the condensation pressure Pk through the first reversing component 50, one path is cooled, condensed and supercooled in the first indoor heat exchanger 30, the other path enters the second indoor heat exchanger 40 through the seventh control valve 330, the heat exchange area is increased, the heat dissipation efficiency is improved, and the system energy efficiency is improved in winter. The cooled liquid refrigerant is throttled and depressurized into medium-pressure refrigerant by the second throttling mechanism 190 through the fifth control valve 300 and the fourth control valve 280, then enters the flash evaporator through the first control valve 250, gas separated in the flash evaporator is used as intermediate supplementing gas, is mixed with refrigerant with pressure P2 and temperature T2 after being compressed by the lower cylinder through the sixth control valve 310, then directly enters the high-pressure stage for compression, the high-pressure stage compression process is optimized, the compression power consumption of the high-pressure stage is reduced, the liquid separated in the flash evaporator is throttled and depressurized into low-temperature low-pressure refrigerant through the third throttling mechanism 240, then enters the evaporator for absorbing heat and evaporating into low-temperature low-pressure gaseous refrigerant, and then enters the lower cylinder for compression, and the whole system circulation process is completed. In severe winter, the system has large operating pressure ratio and large load, and the double-cylinder double-stage air supplementing operation mode of the double condensers can reduce the pressure ratio, increase the area of an indoor heat exchanger (condenser) and greatly improve the energy efficiency of the system.
In a first embodiment, as shown in fig. 7, the second heating mode includes: the first valve port 51 and the fourth valve port 54 of the first reversing element 50 of the control air conditioning system are communicated, and the second valve port 52 and the third valve port 53 of the first reversing element 50 are controlled to be communicated; the fifth valve port 101 and the eighth valve port 104 of the second reversing element 100 of the control air conditioning system are communicated, and the sixth valve port 102 and the seventh valve port 103 of the second reversing element 100 are controlled to be communicated; the second, third, fourth, fifth, seventh, eighth, and tenth control valves 260, 270, 280, 300, 330, 340, and 370 controlling the air conditioning system are closed, and the first, sixth, and ninth control valves 250, 310, and 360 controlling the air conditioning system are opened.
Specifically, the air conditioning system is in the second heating mode, and the system flow path is substantially the same as that shown in fig. 6, with the main difference that the second indoor heat exchanger 40 in the system does not participate in the circulation by closing the fourth control valve 280 and the seventh control valve 330 in the system circulation, and only the first indoor heat exchanger 30 participates in the system circulation, which is advantageous in that the energy saving effect of the system operation is remarkable and the energy efficiency ratio is relatively high in the low load operation.
In the first embodiment, as shown in fig. 8, the third heating mode includes: the first valve port 51 and the fourth valve port 54 of the first reversing element 50 of the control air conditioning system are communicated, and the second valve port 52 and the third valve port 53 of the first reversing element 50 are controlled to be communicated; the fifth valve port 101 and the eighth valve port 104 of the second reversing element 100 of the control air conditioning system are communicated, and the sixth valve port 102 and the seventh valve port 103 of the second reversing element 100 are controlled to be communicated; the second, third, fourth, fifth, seventh, eighth, and tenth control valves 260, 270, 280, 300, 330, 340, and 370 controlling the air conditioning system are opened, and the first, sixth, and ninth control valves 250, 310, and 360 controlling the air conditioning system are closed.
In particular, the cycle of fig. 6 and 7 can achieve higher system energy efficiency when used in severe winter, but in early winter, the outdoor temperature is slightly higher than that in severe winter, but still the air conditioner needs to be turned on for heating, at this time, the pressure ratio is relatively small, the two-stage compression cycle is uneconomical, and the single-stage compression system is more advantageous.
Specifically, the air conditioning system is in the third heating mode, the compressor is in a double-cylinder single-stage operation mode, the low-temperature low-pressure refrigerant from the evaporator is divided into two paths, one path of refrigerant enters the lower cylinder of the compressor through the second reversing component 100, compressed into high-temperature high-pressure refrigerant enters the second indoor heat exchanger 40 through the tenth control valve 370 and the second reversing component 100 for cooling, condensing and supercooling, and the other path of refrigerant enters the upper cylinder of the compressor through the first reversing component 50 for compressing into high-pressure refrigerant, and then enters the first indoor heat exchanger 30 through the first reversing component 50 for cooling, condensing and supercooling. The cooled liquid refrigerant is throttled by the second throttle mechanism 190 to a low-pressure refrigerant through the fourth control valve 280 and the fifth control valve 300, respectively, and then enters the evaporator (i.e., the outdoor heat exchanger 20) through the second control valve 260 to evaporate and absorb heat, so that the whole system circulation process is completed.
In the second embodiment, as shown in fig. 9, the air conditioning system achieves the same operation mode as the first embodiment, i.e., five operation mode switches can be achieved, so that the system is always in a high-efficiency operation state when the system is used in a climate change area throughout the year. The device in this embodiment includes a compression assembly, three heat exchangers, two four-way reversing valves, three-way valves, two throttle valves, and two shut-off valves. The compression assembly can be a multi-cylinder compressor capable of realizing single-stage and double-stage switching, and also can be a plurality of compressors, the heat exchangers are two indoor side heat exchangers, one outdoor side heat exchanger, the four-way reversing valve is responsible for refrigerating and heating switching, the throttling mechanism is responsible for throttling high pressure to medium pressure or throttling medium pressure to low pressure, and the stop valve, the three-way valve and the compression assembly are matched to realize multi-mode switching.
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:
the air conditioning system realizes single-stage and double-stage compression of the refrigerant by arranging the first compression part 11 and the second compression part 12, thereby meeting the requirements of different operation pressure ratios; the switching between cooling and heating is achieved by providing the first reversing element 50 and the second reversing element 100; the refrigeration and the initial separation treatment can be realized by arranging two indoor heat exchangers, and the change of the heat exchange area can be realized; the air conditioning system can further realize the switching of five operation modes, including a double-evaporator double-cylinder single-stage operation mode, a double-evaporator double-cylinder double-stage air supplementing mode, a double-condenser double-cylinder double-stage air supplementing mode, a single-condenser double-cylinder double-stage air supplementing mode and a double-condenser double-cylinder single-stage mode, so that the most economical operation state of the system is ensured when the refrigerating and heating functions are realized in a region with changeable climates.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of being practiced otherwise than as specifically illustrated and described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (27)

1. A control method of an air conditioning system, which is applied to an air conditioning system, the control method of the air conditioning system comprising:
controlling the air conditioning system to enter a refrigeration and dehumidification mode; the cooling and dehumidifying modes include: a first compression part (11) of a compression assembly (10) of the air conditioning system compresses the refrigerant discharged by a first indoor heat exchanger (30) of the air conditioning system and then enables the refrigerant to enter an outdoor heat exchanger (20) of the air conditioning system; a second compression part (12) of the compression assembly (10) compresses the refrigerant discharged by a second indoor heat exchanger (40) of the air conditioning system and then enables the refrigerant to enter the outdoor heat exchanger (20); part of the refrigerant flowing out of the outdoor heat exchanger (20) flows through the first indoor heat exchanger (30) to dehumidify the indoor air, and part of the refrigerant flowing out of the outdoor heat exchanger (20) flows through the second indoor heat exchanger (40) to refrigerate the indoor air; or alternatively, the first and second heat exchangers may be,
Controlling the air conditioning system to enter a refrigeration mode; the cooling mode includes: the second compression part (12) and the refrigerant discharged by the first indoor heat exchanger (30) and the refrigerant discharged by the second indoor heat exchanger (40) are subjected to primary compression, and then the refrigerant enters the first compression part (11) to be subjected to secondary compression; the refrigerant discharged from the first compression part (11) passes through the outdoor heat exchanger (20) and then enters the first indoor heat exchanger (30) and the second indoor heat exchanger (40) respectively to exchange heat with indoor air; or alternatively, the first and second heat exchangers may be,
controlling the air conditioning system to enter a first heating mode; the first heating mode includes: the second compression part (12) performs primary compression on the refrigerant discharged by the outdoor heat exchanger (20), and then makes the refrigerant enter the first compression part (11) for secondary compression; the refrigerant discharged from the first compression part (11) flows into the outdoor heat exchanger (20) after exchanging heat with indoor air through the first indoor heat exchanger (30) and the second indoor heat exchanger (40) respectively; or alternatively, the first and second heat exchangers may be,
controlling the air conditioning system to enter a second heating mode; the second heating mode includes: the second compression part (12) performs primary compression on the refrigerant discharged by the outdoor heat exchanger (20), and then makes the refrigerant enter the first compression part (11) for secondary compression; the refrigerant discharged from the first compression part (11) flows into the outdoor heat exchanger (20) after exchanging heat with indoor air through the first indoor heat exchanger (30); or alternatively, the first and second heat exchangers may be,
Controlling the air conditioning system to enter a third heating mode; the third heating mode includes: the first compression part (11) compresses part of the refrigerant discharged by the outdoor heat exchanger (20) and then enables the refrigerant to enter the first indoor heat exchanger (30) to exchange heat with indoor air; the second compression part (12) compresses part of the refrigerant discharged by the outdoor heat exchanger (20) and then enables the refrigerant to enter the second indoor heat exchanger (40) to exchange heat with indoor air; refrigerant discharged from the first indoor heat exchanger (30) and the second indoor heat exchanger (40) flows into the outdoor heat exchanger (20);
the air conditioning system includes:
a compression assembly (10) comprising a first compression portion (11) and a second compression portion (12), the first compression portion (11) having a first suction port and a first discharge port, the second compression portion (12) having a second suction port and a second discharge port;
the first reversing component (50) is used for switching the refrigerating and heating of the air conditioning system, and the first reversing component (50) is connected with the first air suction port and the first air exhaust port;
the second reversing component (100) is used for switching the refrigerating and heating of the air conditioning system, and the second reversing component (100) is connected with the second air suction port; the second exhaust port is connected with the second reversing component (100) and the first air suction port;
A first indoor heat exchanger (30), a first end of the first indoor heat exchanger (30) being connected to the first reversing component (50);
a second indoor heat exchanger (40), a first end of the second indoor heat exchanger (40) being connected to the second reversing component (100);
the outdoor heat exchanger (20), the first end of outdoor heat exchanger (20) with first switching-over part (50) with second switching-over part (100) all are connected, the second end of outdoor heat exchanger (20) with the second end of first indoor heat exchanger (30) with the second end of second indoor heat exchanger (40) all are connected.
2. The control method of an air conditioning system according to claim 1, characterized in that the first reversing element (50) has a first valve port (51), a second valve port (52), a third valve port (53) and a fourth valve port (54), the first valve port (51) being in communication with the second valve port (52) or the fourth valve port (54), the third valve port (53) being in communication with the fourth valve port (54) or the second valve port (52); the second valve port (52) is connected with the first air suction port; the fourth valve port (54) is connected with the first exhaust port;
the second reversing component (100) is provided with a fifth valve port (101), a sixth valve port (102), a seventh valve port (103) and an eighth valve port (104), wherein the fifth valve port (101) is communicated with the sixth valve port (102) or the eighth valve port (104), and the seventh valve port (103) is communicated with the eighth valve port (104) or the sixth valve port (102); the sixth valve port (102) is connected with the second air suction port; the second exhaust port is connected with the eighth valve port (104) and the first air suction port;
A first end of the first indoor heat exchanger (30) is connected with the first valve port (51);
the first end of the second indoor heat exchanger (40) is connected with the fifth valve port (101);
the first end of the outdoor heat exchanger (20) is connected with the third valve port (53) and the seventh valve port (103).
3. The control method of an air conditioning system according to claim 1, characterized in that the compression assembly (10) is a compressor, the compressor is a double-cylinder compressor, an upper cylinder of the double-cylinder compressor is the first compression part (11), and a lower cylinder of the double-cylinder compressor is the second compression part (12); or, the compression assembly (10) comprises two compressors, one of which is the first compression part (11) and the other of which is the second compression part (12).
4. The control method of an air conditioning system according to claim 1, characterized in that the first reversing component (50) is a four-way reversing valve; and/or, the second reversing component (100) is a four-way reversing valve.
5. The control method of an air conditioning system according to claim 2, characterized in that the air conditioning system further comprises:
a first connection pipe (60), wherein a first end of the first connection pipe (60) is connected with a first end of the first indoor heat exchanger (30), and a second end of the first connection pipe (60) is connected with the first valve port (51);
And a second connecting pipe (70), wherein a first end of the second connecting pipe (70) is connected with the second valve port (52), and a second end of the second connecting pipe (70) is connected with the first air suction port.
6. The control method of an air conditioning system according to claim 2, characterized in that the air conditioning system further comprises:
a third connection pipe (80), a first end of the third connection pipe (80) being connected to a first end of the outdoor heat exchanger (20), a second end of the third connection pipe (80) being connected to the third valve opening (53);
and a fourth connecting pipe (90), wherein a first end of the fourth connecting pipe (90) is connected with the first exhaust port, and a second end of the fourth connecting pipe (90) is connected with the fourth valve port (54).
7. The control method of an air conditioning system according to claim 5, further comprising:
and a fifth connecting pipe (110), wherein a first end of the fifth connecting pipe (110) is connected with a first end of the second indoor heat exchanger (40), and a second end of the fifth connecting pipe (110) is connected with the fifth valve port (101).
8. The control method of an air conditioning system according to claim 2, characterized in that the air conditioning system further comprises:
A sixth connection pipe (120), wherein a first end of the sixth connection pipe (120) is connected with the sixth valve port (102), and a second end of the sixth connection pipe (120) is connected with the second air suction port;
a seventh connection pipe (130), wherein a first end of the seventh connection pipe (130) is connected to the seventh valve port (103), and a second end of the seventh connection pipe (130) is connected to the first end of the outdoor heat exchanger (20).
9. The control method of an air conditioning system according to claim 5, further comprising:
and an eighth connecting pipe (140), wherein a first end of the eighth connecting pipe (140) is connected with the eighth valve port (104), and a second end of the eighth connecting pipe (140) is connected with the second exhaust port.
10. The control method of an air conditioning system according to claim 9, wherein the air conditioning system further comprises:
a first manifold (150), a first end of the first manifold (150) being connected to a second end of the outdoor heat exchanger (20);
a first branch pipe (160), a first end of the first branch pipe (160) is connected with a second end of the first main pipe (150), and a second end of the first branch pipe (160) is connected with a second end of the first indoor heat exchanger (30); a first throttling mechanism (180) is arranged on the first branch pipe (160);
A second branch pipe (170), a first end of the second branch pipe (170) being connected to a second end of the first header pipe (150), a second end of the second branch pipe (170) being connected to a second end of the second indoor heat exchanger (40); a second throttling mechanism (190) is arranged on the second branch pipe (170).
11. The control method of an air conditioning system according to claim 10, wherein the air conditioning system further comprises:
a flash evaporator (200);
a first pipe (210), a first end of the first pipe (210) being connected to a second end of the outdoor heat exchanger (20), a second end of the first pipe (210) being connected to the flash evaporator (200);
a second pipeline (220), wherein a first end of the second pipeline (220) is connected with the flash evaporator (200), and a second end of the second pipeline (220) is connected with a second end of the first indoor heat exchanger (30) and a second end of the second indoor heat exchanger (40);
and a third pipeline (230), wherein a first end of the third pipeline (230) is connected with the flash evaporator (200), and a second end of the third pipeline (230) is connected with the first air suction port.
12. The method of controlling an air conditioning system according to claim 11, wherein a third throttle mechanism (240) is provided on the first pipe (210).
13. The control method of an air conditioning system according to claim 11, characterized in that a first end of the first pipe (210) is connected to the first bus (150), and a second end of the first pipe (210) is connected to the flash evaporator (200);
a first end of the second pipeline (220) is connected with the flash evaporator (200), and a second end of the second pipeline (220) is connected with a second end of the first bus (150); the second pipeline (220) is provided with a first control valve (250);
the air conditioning system further includes:
a second control valve (260) disposed on the first manifold (150) on a side of the first pipe (210) remote from the outdoor heat exchanger (20);
a third control valve (270) provided on the first branch pipe (160);
a fourth control valve (280) disposed on the second branch pipe (170) and located between the second throttle mechanism (190) and the second indoor heat exchanger (40);
a fourth conduit (290), a first end of the fourth conduit (290) being connected to a second end of the first indoor heat exchanger (30), a second end of the fourth conduit (290) being connected to the second branch pipe (170) and being located between the second throttle mechanism (190) and the fourth control valve (280); a fifth control valve (300) is arranged on the fourth pipeline (290).
14. The control method of an air conditioning system according to claim 11, wherein a first end of the third pipe (230) is connected to the flash evaporator (200), and a second end of the third pipe (230) is connected to the first suction port;
the third pipeline (230) is provided with a sixth control valve (310).
15. The control method of an air conditioning system according to claim 7, wherein the air conditioning system further comprises:
a fifth pipe (320), a first end of the fifth pipe (320) being connected to the first connection pipe (60), a second end of the fifth pipe (320) being connected to the fifth connection pipe (110); a seventh control valve (330) is arranged on the fifth pipeline (320);
an eighth control valve (340) is provided on the second connection pipe (70).
16. The control method of an air conditioning system according to claim 9, wherein the air conditioning system further comprises:
a sixth pipeline (350), wherein a first end of the sixth pipeline (350) is connected with the second exhaust port, and a second end of the sixth pipeline (350) is connected with the first air suction port; a ninth control valve (360) is arranged on the sixth pipeline (350);
a tenth control valve (370) provided on the eighth connection pipe (140).
17. The control method of an air conditioning system according to claim 11, wherein the air conditioning system further comprises:
a seventh pipe (380), wherein a first end of the seventh pipe (380) is connected to the second air inlet;
a first three-way valve (390), wherein the first three-way valve (390) is arranged on the second connecting pipe (70), a first connecting port (391) and a second connecting port (392) of the first three-way valve (390) are both positioned on the second connecting pipe (70), and a third connecting port (393) of the first three-way valve (390) is connected with the second end of the seventh pipeline (380); wherein the first connection port (391) is selectively in communication with the second connection port (392) or the third connection port (393).
18. The control method of an air conditioning system according to claim 17, wherein the air conditioning system further comprises:
an eighth pipeline (400);
a second three-way valve (410), wherein the second three-way valve (410) is arranged on the eighth connecting pipe (140), a fourth connecting port (411) and a fifth connecting port (412) of the second three-way valve (410) are both positioned on the eighth connecting pipe (140), and a sixth connecting port (413) of the second three-way valve (410) is connected with the first end of the eighth pipeline (400); wherein the fourth connection port (411) is selectively communicated with the fifth connection port (412) or the sixth connection port (413);
A third three-way valve (420), wherein the third three-way valve (420) is arranged on the second connecting pipe (70) and is positioned at one side of the first three-way valve (390) away from the first reversing component (50), a seventh connecting port (421) and an eighth connecting port (422) of the third three-way valve (420) are both positioned on the second connecting pipe (70), and a ninth connecting port (423) of the third three-way valve (420) is connected with the second end of the eighth pipeline (400); wherein the seventh connection port (421) is selectively communicated with the eighth connection port (422) or the ninth connection port (423).
19. The control method of an air conditioning system according to claim 18, characterized in that a first end of the third pipe (230) is connected to the flash evaporator (200), and a second end of the third pipe (230) is connected to the eighth pipe (400).
20. The method of controlling an air conditioning system according to claim 11, wherein a first end of the first pipe (210) is connected to the first branch pipe (160) and is located at a side of the first throttle mechanism (180) remote from the first header pipe (150), and a second end of the first pipe (210) is connected to the flash evaporator (200); a first valve (430) is arranged on the first pipeline (210);
The first end of the second pipeline (220) is connected with the flash evaporator (200), and the second end of the second pipeline (220) is connected with the second branch pipe (170) and is positioned at one side of the second throttling mechanism (190) away from the second indoor heat exchanger (49);
the air conditioning system further includes:
a ninth pipe (440), wherein a first end of the ninth pipe (440) is connected with the second branch pipe (170) and is positioned at one side of the second throttling mechanism (190) close to the second indoor heat exchanger (40);
a fourth three-way valve (450), the fourth three-way valve (450) is disposed on the first branch pipe (160), a tenth connection port (451) and an eleventh connection port (452) of the fourth three-way valve (450) are both located on the first branch pipe (160), and a twelfth connection port (453) of the fourth three-way valve (450) is connected to the second end of the ninth pipeline (440); wherein the tenth connection port (451) is selectively communicated with the eleventh connection port (452) or the twelfth connection port (453);
a second valve (460) is disposed on the second branch pipe (170) and on a side of the second pipe (220) remote from the second throttle mechanism (190).
21. The control method of an air conditioning system according to claim 1, characterized in that when the air conditioning system is in a cooling and dehumidifying mode and in a rated cooling condition, the flow rate of the refrigerant flowing through the first indoor heat exchanger (30) is q1, and the flow rate of the refrigerant flowing through the second indoor heat exchanger (40) is q2; the ratio of q1 to (q1+q2) ranges from 10% to 30%.
22. The method according to claim 1, wherein the flow rate of the refrigerant flowing through the first indoor heat exchanger (30) is q1, the flow rate of the refrigerant flowing through the second indoor heat exchanger (40) is q2, and the ratio of q1 to (q1+q2) is in the range of 1% -6% when the air conditioning system is in the cooling and dehumidifying mode and in the intermediate cooling condition.
23. The method of controlling an air conditioning system according to claim 1, wherein the cooling and dehumidifying mode includes:
a first valve port (51) and a second valve port (52) of a first reversing component (50) of the air conditioning system are controlled to be communicated, and a fourth valve port (54) and a third valve port (53) of the first reversing component (50) are controlled to be communicated;
a fifth valve port (101) and a sixth valve port (102) of a second reversing component (100) of the air conditioning system are controlled to be communicated, and a seventh valve port (103) and an eighth valve port (104) of the second reversing component (100) are controlled to be communicated;
the second control valve (260), the third control valve (270), the fourth control valve (280), the eighth control valve (340) and the tenth control valve (370) of the air conditioning system are controlled to be opened, and the first control valve (250), the fifth control valve (300), the sixth control valve (310), the seventh control valve (330) and the ninth control valve (360) of the air conditioning system are controlled to be closed.
24. The control method of an air conditioning system according to claim 1, wherein the cooling mode includes:
a first valve port (51) and a second valve port (52) of a first reversing component (50) of the air conditioning system are controlled to be communicated, and a fourth valve port (54) and a third valve port (53) of the first reversing component (50) are controlled to be communicated;
a fifth valve port (101) and a sixth valve port (102) of a second reversing component (100) of the air conditioning system are controlled to be communicated, and a seventh valve port (103) and an eighth valve port (104) of the second reversing component (100) are controlled to be communicated;
the second control valve (260), the third control valve (270), the eighth control valve (340) and the tenth control valve (370) of the air conditioning system are controlled to be closed, and the first control valve (250), the fourth control valve (280), the fifth control valve (300), the sixth control valve (310), the seventh control valve (330) and the ninth control valve (360) of the air conditioning system are controlled to be opened.
25. The control method of an air conditioning system according to claim 1, wherein the first heating mode includes:
a first valve port (51) and a fourth valve port (54) of a first reversing component (50) of the air conditioning system are controlled to be communicated, and a second valve port (52) and a third valve port (53) of the first reversing component (50) are controlled to be communicated;
A fifth valve port (101) and an eighth valve port (104) of a second reversing component (100) of the air conditioning system are controlled to be communicated, and a sixth valve port (102) and a seventh valve port (103) of the second reversing component (100) are controlled to be communicated;
the second control valve (260), the third control valve (270), the eighth control valve (340) and the tenth control valve (370) of the air conditioning system are controlled to be closed, and the first control valve (250), the fourth control valve (280), the fifth control valve (300), the sixth control valve (310), the seventh control valve (330) and the ninth control valve (360) of the air conditioning system are controlled to be opened.
26. The control method of an air conditioning system according to claim 1, wherein the second heating mode includes:
a first valve port (51) and a fourth valve port (54) of a first reversing component (50) of the air conditioning system are controlled to be communicated, and a second valve port (52) and a third valve port (53) of the first reversing component (50) are controlled to be communicated;
a fifth valve port (101) and an eighth valve port (104) of a second reversing component (100) of the air conditioning system are controlled to be communicated, and a sixth valve port (102) and a seventh valve port (103) of the second reversing component (100) are controlled to be communicated;
the second control valve (260), the third control valve (270), the fourth control valve (280), the fifth control valve (300), the seventh control valve (330), the eighth control valve (340) and the tenth control valve (370) of the air conditioning system are controlled to be closed, and the first control valve (250), the sixth control valve (310) and the ninth control valve (360) of the air conditioning system are controlled to be opened.
27. The control method of an air conditioning system according to claim 1, wherein the third heating mode includes:
a first valve port (51) and a fourth valve port (54) of a first reversing component (50) of the air conditioning system are controlled to be communicated, and a second valve port (52) and a third valve port (53) of the first reversing component (50) are controlled to be communicated;
a fifth valve port (101) and an eighth valve port (104) of a second reversing component (100) of the air conditioning system are controlled to be communicated, and a sixth valve port (102) and a seventh valve port (103) of the second reversing component (100) are controlled to be communicated;
the second control valve (260), the third control valve (270), the fourth control valve (280), the fifth control valve (300), the seventh control valve (330), the eighth control valve (340) and the tenth control valve (370) of the air conditioning system are controlled to be opened, and the first control valve (250), the sixth control valve (310) and the ninth control valve (360) of the air conditioning system are controlled to be closed.
CN202010628910.XA 2020-07-02 2020-07-02 Air conditioning system and control method thereof Active CN111707015B (en)

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CN213090173U (en) * 2020-07-02 2021-04-30 珠海格力节能环保制冷技术研究中心有限公司 Air conditioning system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060030446A (en) * 2004-10-05 2006-04-10 류경륜 Refrigeration and air conditioning system
CN110631286A (en) * 2019-10-18 2019-12-31 珠海格力电器股份有限公司 Heat exchange system and control method
CN111237928A (en) * 2020-01-19 2020-06-05 珠海格力电器股份有限公司 Double-temperature double-flash air conditioner refrigerating system
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