CN110986409A - Heat exchange system, control method of heat exchange system and air conditioner - Google Patents

Heat exchange system, control method of heat exchange system and air conditioner Download PDF

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Publication number
CN110986409A
CN110986409A CN201911052414.8A CN201911052414A CN110986409A CN 110986409 A CN110986409 A CN 110986409A CN 201911052414 A CN201911052414 A CN 201911052414A CN 110986409 A CN110986409 A CN 110986409A
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preparation
pipeline
heat exchange
channel
exchange system
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CN110986409B (en
Inventor
魏腾飞
贺申淦
陈辉
吕丹丹
黄海伟
黄康
詹丽强
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Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Zhuhai Gree Energy Saving Environmental Protection Refrigeration Technology Research Center Co Ltd
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Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
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    • 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
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/31—Low ambient temperatures

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

Abstract

The application provides a heat exchange system, including compressor unit, compressor unit's gas vent has connected gradually the entrance point of first heat exchanger, throttling arrangement, second heat exchanger, and the exit end of second heat exchanger communicates with compressor unit's compressor induction port, and compressor unit includes: the system comprises a single-stage compressor assembly, a double-stage compressor assembly and a switching mechanism; the single-stage compressor assembly is operated alone in a first operating condition; the two-stage compressor assembly is independently operated in a second working state; the double-stage compressor component and the single-stage compressor component are matched to perform three-stage compression to be in a third working state; the switching mechanism is used for switching the heat exchange system among a first working state, a second working state and a third working state. According to the heat exchange system, the compressor can work in a stable and reliable running state in a severe cold environment or an environment with large temperature difference change, the energy consumption of the system is reduced, and the adjusting range is wide.

Description

Heat exchange system, control method of heat exchange system and air conditioner
Technical Field
The application belongs to the technical field of air conditioners, and particularly relates to a control method of a heat exchange system, the heat exchange system and the air conditioner.
Background
At present, a single-stage compressor or a multi-stage compressor system is generally adopted for a heat exchange system to carry out refrigeration or heating.
However, when a single-stage compressor is adopted, the single-stage compressor is operated for heating in a relatively high outdoor environment, so that the economic reliability is good, and when the outdoor environment temperature is relatively low, particularly in a cold region and a severe cold region, the heating operation in winter can have a plurality of problems, for example, the outdoor temperature of the severe cold region at minus 30 ℃ can cause that the single-stage compression system can not meet the requirement of heating quantity; when a two-stage compression system is adopted, although the required heating capacity can be achieved, the compressor is overloaded and is in a full-load operation state, and the system reliability is seriously influenced.
Therefore, how to provide a heat exchange system, a control method of the heat exchange system and an air conditioner which can enable the compressor to work in a stable and reliable operation state in a severe cold environment or an environment with large temperature difference change, reduce the energy consumption of the system and have a wide adjustment range becomes a problem which needs to be solved by technical personnel in the field.
Disclosure of Invention
Therefore, the technical problem to be solved in the present application is to provide a heat exchange system, a control method of the heat exchange system, and an air conditioner, which can enable a compressor to work in a stable and reliable operation state in a severe cold environment or an environment with large temperature difference change, reduce the energy consumption of the system, and have a wide adjustment range.
In order to solve the above problem, the present application provides a heat exchange system, including compressor unit, compressor unit's gas vent has connected gradually the entrance point of first heat exchanger, throttling arrangement, second heat exchanger, and the exit end of second heat exchanger communicates with compressor unit's compressor induction port, and compressor unit includes: the system comprises a single-stage compressor assembly, a double-stage compressor assembly and a switching mechanism; the single-stage compressor assembly is operated alone in a first operating condition; the two-stage compressor assembly is independently operated in a second working state; the double-stage compressor assembly and the single-stage compressor assembly are matched to perform three-stage compression to be in a third working state, and the three-stage compression is performed to be in the third working state; the switching mechanism is used for switching the heat exchange system among a first working state, a second working state and a third working state.
Preferably, the restriction device comprises a first restriction; the double-stage compressor assembly comprises a compressor main body, and an air supplementing cavity of the compressor main body is communicated with a flash tank; the compressor exhaust port, the first heat exchanger and the first throttler of the single-stage compressor assembly are sequentially connected; the compressor discharge of the dual stage compressor assembly is adapted for selective communication with one of the first heat exchanger and the single stage compressor assembly.
Preferably, the throttling means further comprises a second restriction, the outlet end of the first restriction being adapted for selective communication with at least one of the second heat exchanger, the second restriction and the flash tank.
Preferably, the switching mechanism comprises a pipeline adjusting mechanism, and the outlet end of the first restrictor, the compressor exhaust port of the two-stage compressor assembly, the inlet end of the second restrictor, the first heat exchanger, the compressor air suction port of the single-stage compressor assembly, the inlet end of the second heat exchanger and the inlet end of the flash tank are connected to the pipeline adjusting mechanism; the pipeline adjusting mechanism is used for collecting the refrigerant flowing out of the first throttling device and/or the compressor exhaust port of the two-stage compressor assembly, and controlling the flow direction of the refrigerant according to the working state of the heat exchange system.
Preferably, the pipeline adjusting mechanism comprises a control part and a first channel, a second channel, a third channel, a fourth channel, a fifth channel and a sixth channel; the control piece is used for controlling the opening and closing of any channel of the first channel, the second channel, the third channel, the fourth channel, the fifth channel and the sixth channel; the first channel is communicated with the outlet end of the first throttling device, and the second channel is respectively communicated with the first heat exchanger and a compressor air suction port of the single-stage compressor assembly; the third channel is communicated with the flash tank; the fourth channel is communicated with a compressor exhaust port of the double-stage compressor assembly, the fifth channel is communicated with the inlet end of the second heat exchanger, and the sixth channel is communicated with the inlet end of the second throttling valve.
Preferably, a temperature sensor and a pressure sensor 8 are arranged in the pipeline adjusting mechanism.
Preferably, a second storage area, a third storage area, a fifth storage area and a sixth storage area are arranged in the pipeline adjusting mechanism, the second channel is communicated with the second storage area, the third channel is communicated with the third storage area, and the fifth channel is communicated with the fifth storage area; the sixth channel is communicated with the sixth storage area; the second storage area, the third storage area, the fifth storage area and the sixth storage area are communicated to the heat exchange chamber and are respectively used for storing refrigerants with corresponding temperature and pressure.
Preferably, the dual stage compressor assembly further comprises an air make-up valve; the air compensating valve is communicated with the flash tank and the pipeline adjusting mechanism; the air compensating valve is used for adjusting the air input into the flash tank.
Preferably, the switching mechanism comprises a three-way reversing valve, and a first port, a second port and a third port are arranged on the three-way reversing valve; the first port is communicated with a compressor exhaust port of the two-stage compressor assembly; the second port is communicated with a single-stage compressor component compressor suction port, and the third port is communicated with the first heat exchanger.
Preferably, the switching mechanism further comprises a first control valve and a second control valve, and the outlet end of the second heat exchanger is communicated with the compressor suction port of the single-stage compressor assembly through a first pipeline; the outlet end of the second heat exchanger is communicated with a compressor air suction port of the second pipeline double-stage compressor assembly; the first control valve is arranged on the first pipeline and used for controlling the on-off of the first pipeline; the second control valve is arranged on the second pipeline and used for controlling the on-off of the second pipeline.
Preferably, the switching mechanism comprises a pipeline adjusting mechanism; the pipeline adjusting mechanism comprises a first gas-liquid separator and a second gas-liquid separator; the first gas-liquid separator is communicated with the first throttling device and the flash tank through a fifth pipeline; a fifth control valve is arranged on the fifth pipeline and used for controlling the on-off of the fifth pipeline; the second gas-liquid separator is communicated with a compressor exhaust port of the double-stage compressor assembly and a compressor suction port of the single-stage compressor assembly through a sixth pipeline; and a sixth control valve is arranged on the sixth pipeline and used for controlling the on-off of the sixth pipeline.
Preferably, the pipeline adjusting mechanism further comprises a third pipeline, a fourth pipeline and a seventh pipeline, wherein the third pipeline is communicated with the first throttling device and the inlet end of the second heat exchanger; the fourth pipeline is communicated with the first throttling device and the second throttling device; the seventh pipeline is communicated with a compressor exhaust port of the double-stage compressor assembly and the first heat exchanger; the third pipeline is provided with a third control valve which is used for controlling the on-off of the third pipeline; a fourth control valve is arranged on the fourth pipeline and used for controlling the on-off of the fourth pipeline; and a seventh control valve is arranged on the seventh pipeline and used for controlling the on-off of the seventh pipeline.
According to an embodiment of the present application, there is also disclosed a method for controlling a heat exchange system, where the heat exchange system is the above-mentioned heat exchange system, and includes:
detecting temperature-regulating load
Figure BDA0002255642800000031
The temperature regulation load is cold or heat quantity which is required to be supplied to the indoor space and is used for regulating the environment temperature to be preset temperature;
according to the load of temperature regulation
Figure BDA0002255642800000032
And controlling the working state of the heat exchange system to be switched among a first working state, a second working state and a third working state.
Preferably, the temperature control load is detected
Figure BDA0002255642800000033
Comprises the following steps:
detecting indoor ambient temperature TRing (C)；
According to the ambient temperature TRing (C)And a predetermined temperature TPreparation ofThe difference in temperature determines the tempering load.
Preferably, depending on the tempering load
Figure BDA0002255642800000034
The step of controlling the working state of the heat exchange system comprises the following steps:
judgment of
Figure BDA0002255642800000035
And a first predetermined load
Figure BDA0002255642800000036
And a second preset load
Figure BDA0002255642800000037
The relationship of (1);
according to the load of temperature regulation
Figure BDA0002255642800000038
And a first predetermined load
Figure BDA0002255642800000039
And a second preset load
Figure BDA00022556428000000310
Controls the working state of the heat exchange system.
Preferably, depending on the tempering load
Figure BDA0002255642800000041
And a first predetermined load
Figure BDA0002255642800000042
And a second preset load
Figure BDA0002255642800000043
The step of controlling the working state of the heat exchange system comprises the following steps:
when in use
Figure BDA0002255642800000044
When the heat exchange system is in the first working state, the heat exchange system is controlled to enter the first working state;
when in use
Figure BDA0002255642800000045
When the heat exchange system is in the first working state, controlling the heat exchange system to enter a second working state;
when in use
Figure BDA0002255642800000046
When the heat exchange system is in the third working state, the heat exchange system is controlled to enter the third working state; wherein
Figure BDA0002255642800000047
Figure BDA0002255642800000048
Preferably, when the heat exchange system is in a first working state, the first control valve is controlled to be closed, the second control valve is controlled to be opened, meanwhile, the first port, the second port and the third port of the three-way reversing valve are controlled to be closed, the first channel and the fifth channel are controlled to be opened, the second channel, the third channel, the fourth channel and the sixth channel are controlled to be closed, the two-stage compressor assembly is unloaded, the single-stage compressor assembly is loaded, the first throttling device is communicated with the inlet end of the second heat exchanger, and the outlet end of the second heat exchanger is communicated to the compressor suction port of the single-stage compressor assembly;
when the heat exchange system is in a second working state, the first control valve is controlled to be closed, and the second control valve is controlled to be opened; simultaneously controlling a first port and a third port of the three-way reversing valve to be opened, and closing a second port; the first channel, the second channel, the third channel, the fourth channel and the sixth channel are controlled to be opened, the fifth channel is closed, the double-stage compressor assembly is loaded, the single-stage compressor assembly is unloaded, a compressor exhaust port of the double-stage compressor assembly is communicated with the first heat exchanger, and the outlet end of the first restrictor is communicated with the second restrictor and the air supply valve;
when the heat exchange system is in a third working state, the first control valve and the second control valve are controlled to be closed, the first port and the second port of the three-way reversing valve are controlled to be opened, and the third port is controlled to be closed; and the first channel, the second channel, the third channel, the fourth channel and the sixth channel are controlled to be opened, the fifth channel is closed, the double-stage compressor assembly and the single-stage compressor assembly are loaded, the compressor exhaust port of the double-stage compressor assembly is communicated with the compressor suction port of the single-stage compressor assembly, and the outlet end of the first restrictor is communicated with the second restrictor and the air compensating valve.
Preferably, when the heat exchange system is in the first working state, the third control valve is controlled to be closed, and the third pipeline is communicated; the fourth control valve, the fifth control valve, the sixth control valve and the seventh control valve are controlled to be disconnected, the fourth pipeline, the fifth pipeline, the sixth pipeline and the seventh pipeline are disconnected, and the first throttling device is communicated with the second heat exchanger;
when the heat exchange system is in a second working state, the fourth control valve, the fifth control valve and the seventh control valve are controlled to be closed, and the fourth pipeline, the fifth pipeline and the seventh pipeline are communicated; the third control valve and the sixth control valve are controlled to be disconnected, the third pipeline and the sixth pipeline are disconnected, the first throttling device and the second throttling device are communicated, a compressor exhaust port of the double-stage compressor assembly is communicated with the first heat exchanger, and the first throttling device is communicated with the flash tank;
when the heat exchange system is in a third working state, the fourth control valve, the fifth control valve and the sixth control valve are controlled to be closed, and the fourth pipeline, the fifth pipeline and the sixth pipeline are communicated; controlling the third control valve and the seventh control valve to be disconnected, the third pipeline and the seventh pipeline to be disconnected, and the third pipeline and the sixth pipeline to be disconnected; the first throttler is communicated with the second throttler, the outlet end of the second heat exchanger is communicated with a compressor suction port of the double-stage compressor assembly, and the first throttler is communicated with the flash tank.
Preferably, the control method of the heat exchange system further comprises:
detecting temperature T of refrigerant in refrigerant heat exchange memberColdAnd pressure PCold；
According to TColdAnd PColdWith a preset value of temperature TPreparation ofAnd controlling the refrigerant in the heat exchange chamber to enter the corresponding storage area in relation to the preset pressure value.
Preferably, according to TColdAnd PColdThe step of controlling the refrigerant in the heat exchange chamber to enter the corresponding storage area according to the relation between the preset temperature value and the preset pressure value comprises the following steps:
when T1Preparation of≦TCold<T2Preparation ofAnd P1Preparation of≦P2Cold<P2Preparation ofWhen the refrigerant enters the second storage area, the refrigerant is controlled to enter the second storage area; wherein P1Preparation ofAnd P2Preparation ofFor the preset value of the pressure in the second channel, T1Preparation ofAnd T2Preparation ofThe preset temperature value of the second channel is obtained;
when T2Preparation of≦TCold<T3Preparation ofAnd P2Preparation of≦P2Cold<P3Preparation ofWhen the refrigerant enters the third storage area, the refrigerant is controlled to enter the third storage area; wherein P2Preparation ofAnd P3Preparation ofFor the pressure preset value of the third channel, T2Preparation ofAnd T3Preparation ofIs the temperature preset value of the third channel;
when T4Preparation of≦TCold<T5Preparation ofAnd P4Preparation of≦P2Cold<P5Preparation ofMeanwhile, controlling the refrigerant to enter a fifth storage area; wherein P4Preparation ofAnd P5Preparation ofFor the pressure preset value of the fifth passage, T4Preparation ofAnd T5Preparation ofThe temperature preset value of the fifth channel is obtained;
when T5Preparation of≦TCold<T6Preparation ofAnd P5Preparation of≦P2Cold<P6Preparation ofWhen the refrigerant enters the sixth storage area, the refrigerant is controlled to enter the sixth storage area; wherein P5Preparation ofAnd P6Preparation ofFor the pressure preset value of the sixth passage, T5Preparation ofAnd T6Preparation ofThe temperature preset value of the sixth channel is obtained; wherein T3Preparation of<T4Preparation of<T5Preparation of<T6Preparation of<T1Preparation of<T2Preparation of；P3Preparation of<P4Preparation of<P5Preparation of<P6Preparation of<P1Preparation of<P2Preparation of。
According to still another aspect of the present application, there is provided an air conditioner including a heat exchange system as described above.
The application provides a heat transfer system can switch between these three kinds of operating condition of single stage compressor work, bipolar compressor work and tertiary compressor work according to the change of the load that adjusts the temperature, can make the compressor be in under the reliable and stable state of operation under the severe cold environment or in the environment that the difference in temperature changes greatly, reduces the system energy consumption to the control range is wide.
Drawings
Fig. 1 is a schematic structural diagram of a heat exchange system according to an embodiment of the present application.
The reference numerals are represented as:
1. a two-stage compressor assembly; 2. a single stage compressor assembly; 21. a flash tank; 22. an air supply valve; 31. a first control valve; 32. a second control valve; 33. a three-way reversing valve; 331. a first port; 332. a second port; 333. a third port; 34. a pipeline adjusting mechanism; 341. a first channel; 342. a second channel; 343. a third channel; 344. a fourth channel; 345. a fifth channel; 346. a sixth channel; 347. a temperature sensor; 348. a pressure sensor; 4. a first heat exchanger; 5. a first restrictor; 6. a second choke; 7. a second heat exchanger.
Detailed Description
Referring to fig. 1 in combination, according to an embodiment of the present application, a heat exchange system includes a compressor unit, an exhaust port of the compressor unit is sequentially connected with an inlet end of a first heat exchanger 4, a throttling device and a second heat exchanger 7, an outlet end of the second heat exchanger 7 is communicated with a compressor suction port of the compressor unit, and the compressor unit includes: the system comprises a single-stage compressor component 2, a double-stage compressor component 1 and a switching mechanism; the single-stage compressor assembly 2 alone is operated in a first operating condition; the two-stage compressor assembly 1 is operated alone in a second operating state; the double-stage compressor component 1 and the single-stage compressor component 2 are matched to perform three-stage compression to form a third working state; the switching mechanism is used for switching the heat exchange system among a first working state, a second working state and a third working state, so that the compressor can work in a stable and reliable running state in a severe cold environment or an environment with large temperature difference change, the energy consumption of the system is reduced, and the adjusting range is wide.
Further, the throttling means comprise a first throttle 5; the double-stage compressor component 1 comprises a compressor main body, and an air supplementing cavity of the compressor main body is communicated with a flash tank 21; the compressor, the first heat exchanger 4 and the first throttling device 5 of the single-stage compressor component 2 are sequentially connected; the compressor discharge of the dual stage compressor assembly 1 is adapted to selectively communicate with one of the first heat exchanger 4 and the single stage compressor assembly 2.
Further, the throttling arrangement further comprises a second throttling device 6, and the outlet end of the first throttling device 5 is used for selectively communicating with at least one of the second heat exchanger 7, the second throttling device 6 and the flash tank 21.
Further, the switching mechanism comprises a pipeline adjusting mechanism 34, and the outlet end of the first throttling device 5, the compressor exhaust port of the two-stage compressor assembly 1, the inlet end of the second throttling device 6, the first heat exchanger 4, the compressor air suction port of the single-stage compressor assembly 2, the inlet end of the second heat exchanger 7 and the inlet end of the flash tank 21 are all connected to the pipeline adjusting mechanism 34; the pipeline adjusting mechanism 34 is used for collecting the refrigerant flowing out of the first throttling device 5 and/or the compressor exhaust port of the two-stage compressor assembly 1, and controlling the flow direction of the refrigerant according to the working state of the heat exchange system.
Further, the line adjustment mechanism 34 includes a control member and a first passage 341, a second passage 342, a third passage 343, a fourth passage 344, a fifth passage 345, and a sixth passage 346; the control part is used for controlling the opening and closing of any one of the first channel 341, the second channel 342, the third channel 343, the fourth channel 344, the fifth channel 345 and the sixth channel 346; the first passage 341 is communicated with the outlet end of the first throttling device 5, and the second passage 342 is respectively communicated with the first heat exchanger 4 and the compressor suction port of the single-stage compressor assembly 2; the third channel 343 is communicated with the flash tank 21; when the temperature adjusting load is small, the heat exchange system is in a first working state, the single-stage compressor 2 assembly is loaded, the bipolar compressor assembly 1 is unloaded, a refrigerant flowing into the single-stage compressor assembly 2 through the first throttling device 5 and the first channel 341 directly flows out through the fifth channel 345, then enters the second heat exchanger 7, and directly flows back to a compressor suction port of the single-stage compressor assembly 2 after passing through the second heat exchanger 7, so that the heat exchange process is completed; when the temperature-adjusting load is larger, the heat exchange system is in a second working state, the single-stage compressor 2 component is unloaded, the bipolar compressor component 1 is loaded, the refrigerant discharged from the compressor exhaust port of the bipolar compressor component 1 flows into the first heat exchanger 4 through the refrigerant heat exchange part, enters the first throttling device 5 through the first heat exchanger 4, then flows into the refrigerant heat exchange part from the first channel 341, at the moment, the refrigerant entering from the first channel 341 exchanges heat with the refrigerant discharged from the compressor exhaust port of the bipolar compressor assembly 1 in the refrigerant heat exchange part, after the heat exchange, a part of the refrigerant enters the second heat exchanger 7, the refrigerant directly flows back to the compressor air suction port of the two-stage compressor assembly 1 through the second heat exchanger 7, and the other part of the refrigerant is transmitted to the flash tank 21 through the third channel 343, is flashed and then enters the compressor air supplement cavity of the two-stage compressor assembly 1 for secondary compression; when the temperature adjusting load is large, the heat exchange system is in a third working state, the single-stage compressor component 2 and the bipolar compressor component 1 are both loaded, the refrigerant discharged from the compressor exhaust port of the bipolar compressor component 1 flows into the compressor air suction port of the first-stage compressor component 2 through the refrigerant heat exchange part for three-stage compression, enters the first throttling device 5 through the first heat exchanger 4, then flows into the refrigerant heat exchange part from the first channel 341, at the moment, the refrigerant entering from the first channel 341 exchanges heat with the refrigerant discharged from the compressor exhaust port of the bipolar compressor assembly 1 in the refrigerant heat exchange part, after the heat exchange, a part of the refrigerant enters the second heat exchanger 7, and then directly flows back to the compressor air suction port of the two-stage compressor assembly 1 through the second heat exchanger 7, and the other part of the refrigerant is conveyed to the flash tank 21 through the third channel 343, is flashed and then enters the compressor air supplement chamber of the two-stage compressor assembly 1 for secondary compression.
Further, the line adjusting mechanism 34 further comprises a heat exchange chamber, to which the first passage 341, the second passage 342, the third passage 343, the fourth passage 344, the fifth passage 345 and the sixth passage 346 are communicated.
Further, a temperature sensor 347 and a pressure sensor 348 are provided in the line adjustment mechanism 34.
Further, a second storage area, a third storage area, a fifth storage area and a sixth storage area are arranged in the pipeline adjusting mechanism 34, a second channel 342 is communicated with the second storage area, a third channel 343 is communicated with the third storage area, and a fifth channel 345 is communicated with the fifth storage area; sixth channel 346 communicates with a sixth storage area; the second storage area, the third storage area, the fifth storage area and the sixth storage area are communicated to the heat exchange chamber and are respectively used for storing refrigerants with corresponding temperature and pressure.
Further, the single-stage compressor is a double-cylinder compressor or a single-cylinder compressor.
Further, the single-stage compressor is a twin-rotor compressor.
Further, the single-stage compressor is an inverter compressor.
Further, the bipolar compressor is an inverter compressor.
Further, the dual-stage compressor assembly 1 also comprises an aeration valve 22; the air compensating valve 22 is communicated with the flash tank 21 and the pipeline adjusting mechanism 34; the air compensating valve 22 is used for adjusting the air inflow into the flash tank 21.
Further, the switching mechanism comprises a three-way reversing valve 33, and the three-way reversing valve 33 is provided with a first port 331, a second port 332 and a third port 333; the first port 331 is in communication with the compressor discharge of the two-stage compressor assembly 1; the second port 332 communicates with the compressor suction of the single stage compressor assembly 2 and the third port 333 communicates with the first heat exchanger 4.
Further, the switching mechanism further comprises a first control valve 31 and a second control valve 32, and the outlet end of the second heat exchanger 7 is communicated with the compressor suction port of the single-stage compressor assembly 2 through a first pipeline; the outlet end of the second heat exchanger 7 is communicated with a compressor suction port of the second pipeline double-stage compressor component 1; the first control valve 31 is arranged on the first pipeline, and the first control valve 31 is used for controlling the on-off of the first pipeline; the second control valve 32 is disposed on the second pipeline, and the second control valve 32 is used for controlling on-off of the second pipeline, so as to control loading and unloading of the single-stage compressor assembly 2 and the two-stage compressor assembly 1.
Further, the switching mechanism includes a pipeline adjusting mechanism 34; the line adjusting mechanism 34 includes a first gas-liquid separator and a second gas-liquid separator; the first gas-liquid separator is communicated with the first throttling device 5 and the flash tank 21 through a fifth pipeline; a fifth control valve is arranged on the fifth pipeline and used for controlling the on-off of the fifth pipeline; the second gas-liquid separator is communicated with a compressor exhaust port of the two-stage compressor component 1 and a compressor suction port of the single-stage compressor component 2 through a sixth pipeline; and a sixth control valve is arranged on the sixth pipeline and used for controlling the on-off of the sixth pipeline, and the first gas-liquid separator and the second gas-liquid separator can ensure that the refrigerant flowing into the compressor exhaust port of the single-stage compressor assembly 1 is gas, so that the liquid impact phenomenon is prevented.
Further, the pipeline adjusting mechanism 34 further includes a third pipeline, a fourth pipeline and a seventh pipeline, the third pipeline is communicated with the inlet ends of the first throttling device 5 and the second heat exchanger 7; the fourth pipeline is communicated with the first throttling device 5 and the second throttling device 6; the seventh pipeline is communicated with the compressor exhaust port of the double-stage compressor assembly 1 and the first heat exchanger 4; the third pipeline is provided with a third control valve which is used for controlling the on-off of the third pipeline; a fourth control valve is arranged on the fourth pipeline and used for controlling the on-off of the fourth pipeline; and a seventh control valve is arranged on the seventh pipeline and used for controlling the on-off of the seventh pipeline, so that the structure is simpler and the cost is low.
According to an embodiment of the present application, there is also disclosed a method for controlling a heat exchange system, where the heat exchange system is the above-mentioned heat exchange system, and includes:
detecting temperature-regulating load
Figure BDA0002255642800000091
The temperature regulation load is cold or heat quantity which is required to be supplied to the indoor space and is used for regulating the environment temperature to be preset temperature;
according to the load of temperature regulation
Figure BDA0002255642800000092
The heat exchange system is controlled to be switched among the first working state, the second working state and the third working state, so that the compressor can work in a stable and reliable running state in a severe cold environment or an environment with large temperature difference change, the energy consumption of the system is reduced, and the adjusting range is wide.
Further, the temperature adjusting load is detected
Figure BDA0002255642800000093
Comprises the following steps:
detecting indoor ambient temperature TRing (C)；
According to the ambient temperature TRing (C)And a predetermined temperature TPreparation ofThe difference in temperature determines the tempering load.
Further, according to the load of temperature adjustment
Figure BDA0002255642800000094
The step of controlling the working state of the heat exchange system comprises the following steps:
judgment of
Figure BDA0002255642800000095
And a first predetermined load
Figure BDA0002255642800000096
And a second preset load
Figure BDA0002255642800000097
The relationship of (1);
according to the load of temperature regulation
Figure BDA0002255642800000098
And a first predetermined load
Figure BDA0002255642800000099
And a second preset load
Figure BDA00022556428000000910
Controls the working state of the heat exchange system.
Further, according to the load of temperature adjustment
Figure BDA00022556428000000911
And a first predetermined load
Figure BDA00022556428000000912
And a second preset load
Figure BDA00022556428000000913
Figure BDA00022556428000000914
The step of controlling the working state of the heat exchange system comprises the following steps:
when in use
Figure BDA00022556428000000915
When the heat exchange system is in the first working state, the heat exchange system is controlled to enter the first working state;
when in use
Figure BDA00022556428000000916
When the heat exchange system is in the first working state, controlling the heat exchange system to enter a second working state;
when in use
Figure BDA00022556428000000917
When the heat exchange system is in the third working state, the heat exchange system is controlled to enter the third working state; wherein
Figure BDA00022556428000000918
Figure BDA00022556428000000919
Further, when the heat exchange system is in the first working state, the first control valve 31 is controlled to be closed, the second control valve 32 is controlled to be opened, meanwhile, the first port 331, the second port 332 and the third port 333 of the three-way reversing valve 33 are controlled to be closed, the first passage 341 and the fifth passage 345 are controlled to be opened, the second passage 342, the third passage 343, the fourth passage 344 and the sixth passage 346 are controlled to be closed, the two-stage compressor assembly 1 is unloaded, the single-stage compressor assembly 2 is loaded, the first throttling device 5 is communicated with the inlet end of the second heat exchanger 7, and the outlet end of the second heat exchanger 4 is communicated to the compressor suction port of the single-stage compressor assembly 2;
when the heat exchange system is in a second working state, the first control valve 31 is controlled to be closed, and the second control valve 32 is controlled to be opened; simultaneously controlling the first port 331 and the third port 333 of the three-way reversing valve 33 to be opened, and the second port 332 to be closed; the first channel 341, the second channel 342, the third channel 343, the fourth channel 344 and the sixth channel 346 are controlled to be opened, the fifth channel 345 is closed, the double-stage compressor assembly 1 is loaded, the single-stage compressor assembly 2 is unloaded, the compressor exhaust port of the double-stage compressor assembly 1 is communicated with the first heat exchanger 4, and the outlet end of the first throttling device 5 is communicated with the second throttling device 6 and the air replenishing valve;
when the heat exchange system is in a third working state, the first control valve 31 and the second control valve 32 are controlled to be closed, the first port 331 and the second port 332 of the three-way reversing valve 33 are controlled to be opened, and the third port 333 is controlled to be closed; and controls the first passage 341, the second passage 342, the third passage 343, the fourth passage 344 and the sixth passage 346 to be opened, the fifth passage 345 to be closed, the two-stage compressor assembly 1 and the single-stage compressor assembly 2 to be loaded, the compressor discharge port of the two-stage compressor assembly 1 to be communicated with the compressor suction port of the single-stage compressor assembly 2, and the outlet port of the first throttling device 5 to be communicated with the second throttling device 6 and the air replenishing valve.
Further, when the heat exchange system is in the first working state, the third control valve is controlled to be closed, and the third pipeline is communicated; the fourth control valve, the fifth control valve, the sixth control valve and the seventh control valve are controlled to be disconnected, the fourth pipeline, the fifth pipeline, the sixth pipeline and the seventh pipeline are disconnected, and the first throttling device 5 is communicated with the second heat exchanger 7;
when the heat exchange system is in a second working state, the fourth control valve, the fifth control valve and the seventh control valve are controlled to be closed, and the fourth pipeline, the fifth pipeline and the seventh pipeline are communicated; controlling the third control valve and the sixth control valve to be disconnected, the third pipeline and the sixth pipeline to be disconnected, communicating the first throttling device 5 with the second throttling device 6, communicating a compressor exhaust port of the double-stage compressor assembly 1 with the first heat exchanger 4, and communicating the first throttling device 5 with the flash tank 21;
when the heat exchange system is in a third working state, the fourth control valve, the fifth control valve and the sixth control valve are controlled to be closed, and the fourth pipeline, the fifth pipeline and the sixth pipeline are communicated; controlling the third control valve and the seventh control valve to be disconnected, the third pipeline and the seventh pipeline to be disconnected, and the third pipeline and the sixth pipeline to be disconnected; the first throttling device 5 is communicated with the second throttling device 6, the outlet end of the second heat exchanger 7 is communicated with the compressor suction port of the double-stage compressor assembly 1, and the first throttling device 5 is communicated with the flash tank 21.
Further, the control method of the heat exchange system further comprises the following steps:
detecting temperature T of refrigerant in refrigerant heat exchange memberColdAnd pressure PCold；
According to TColdAnd PColdAnd controlling the refrigerant in the heat exchange chamber to enter the corresponding storage area according to the relation between the preset temperature value and the preset pressure value.
Further, according to TColdAnd PColdThe step of controlling the refrigerant in the heat exchange chamber to enter the corresponding storage area according to the relation between the preset temperature value and the preset pressure value comprises the following steps:
when T1Preparation of≦TCold<T2Preparation ofAnd P1Preparation of≦P2Cold<P2Preparation ofWhen the refrigerant enters the second storage area, the refrigerant is controlled to enter the second storage area; wherein P1Preparation ofAnd P2Preparation ofFor the preset value of the pressure of the second passage 342, T1Preparation ofAnd T2Preparation ofIs a preset value of the temperature of the second channel 342;
when T2Preparation of≦TCold<T3Preparation ofAnd P2Preparation of≦P2Cold<P3Preparation ofWhen the refrigerant enters the third storage area, the refrigerant is controlled to enter the third storage area; wherein P2Preparation ofAnd P3Preparation ofIs the pressure preset value of the third channel 343, T2Preparation ofAnd T3Preparation ofIs the temperature preset value of the third channel 343;
when T4Preparation of≦TCold<T5Preparation ofAnd P4Preparation of≦P2Cold<P5Preparation ofMeanwhile, controlling the refrigerant to enter a fifth storage area; wherein P4Preparation ofAnd P5Preparation ofFor the preset value of the pressure in the fifth channel 345, T4Preparation ofAnd T5Preparation ofIs a preset value of the temperature of the fifth channel 345;
when T5Preparation of≦TCold<T6Preparation ofAnd P5Preparation of≦P2Cold<P6Preparation ofWhen the refrigerant enters the sixth storage area, the refrigerant is controlled to enter the sixth storage area; wherein P5Preparation ofAnd P6Preparation ofFor the pressure preset value of the sixth passage 346, T5Preparation ofAnd T6Preparation ofIs the temperature preset value for the sixth channel 346; wherein T3Preparation of<T4Preparation of<T5Preparation of<T6Preparation of<T1Preparation of<T2Preparation of；P3Preparation of<P4Preparation of<P5Preparation of<P6Preparation of<P1Preparation of<P2Preparation of。
According to the embodiment of the application, the air conditioner comprises the heat exchange system.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims (22)

1. The utility model provides a heat exchange system, includes compressor unit, first heat exchanger (4), throttling arrangement and second heat exchanger (7) that connect gradually, its characterized in that, compressor unit includes: the system comprises a single-stage compressor assembly (2), a double-stage compressor assembly (1) and a switching mechanism; said single-stage compressor assembly (2) operating alone in a first operating condition; the double-stage compressor assembly (1) is independently operated in a second working state; the double-stage compressor component (1) and the single-stage compressor component (2) are matched to perform three-stage compression to form a third working state; the switching mechanism is used for switching the heat exchange system among a first working state, a second working state and a third working state.
2. A heat exchange system according to claim 1, wherein the throttling means comprises a first throttle (5); the double-stage compressor assembly (1) comprises a compressor main body, and an air replenishing cavity of the compressor main body is communicated with a flash tank (21); the single-stage compressor assembly (2), the first heat exchanger (4) and the first throttling device (5) are connected in sequence; the compressor discharge of the dual stage compressor assembly (1) is adapted to selectively communicate with one of the first heat exchanger (4) and the single stage compressor assembly (2).
3. A heat exchange system according to claim 2, wherein the throttling means further comprises a second throttling device (6), the outlet end of the first throttling device (5) being adapted to be in selective communication with at least one of the second heat exchanger (7), the second throttling device (6) and the flash tank (21).
4. The heat exchange system according to claim 3, wherein the switching mechanism comprises a pipeline adjusting mechanism (34), and the outlet end of the first throttling device (5), the compressor exhaust port of the two-stage compressor assembly (1), the inlet end of the second throttling device (6), the first heat exchanger (4), the compressor suction port of the single-stage compressor assembly (2), the inlet end of the second heat exchanger (7) and the inlet end of the flash tank (21) are all connected to the pipeline adjusting mechanism (34); the pipeline adjusting mechanism (34) is used for collecting the refrigerant flowing out of the first throttling device (5) and/or the compressor exhaust port of the two-stage compressor assembly (1), and controlling the flow direction of the refrigerant according to the working state of the heat exchange system.
5. The heat exchange system according to claim 4, wherein the tube adjustment mechanism (34) comprises a control member and a first channel (341), a second channel (342), a third channel (343), a fourth channel (344), a fifth channel (345) and a sixth channel (346); the control part is used for controlling the opening and closing of any one of the first channel (341), the second channel (342), the third channel (343), the fourth channel (344), the fifth channel (345) and the sixth channel (346); the first passage (341) is communicated with the outlet end of the first throttling device (5), and the second passage (342) is respectively communicated with the first heat exchanger (4) and the compressor suction port of the single-stage compressor assembly (2); the third channel (343) is in communication with the flash tank (21); the fourth passage (344) is in communication with a compressor discharge of the dual stage compressor assembly (1), the fifth passage (345) is in communication with an inlet end of the second heat exchanger (7), and the sixth passage (346) is in communication with an inlet end of the second throttle valve.
6. A heat exchange system according to claim 5, characterized in that the line conditioning means (34) further comprises a heat exchange chamber to which the first (341), second (342), third (343), fourth (344), fifth (345) and sixth (346) channels are connected.
7. The heat exchange system of claim 6, wherein a temperature sensor (347) and a pressure sensor (348) are disposed within the line conditioning mechanism (34).
8. The heat exchange system according to claim 7, wherein a second storage area, a third storage area, a fifth storage area and a sixth storage area are arranged in the pipeline adjusting mechanism (34), the second channel (342) is communicated with the second storage area, the third channel (343) is communicated with the third storage area, and the fifth channel (345) is communicated with the fifth storage area; said sixth channel (346) being in communication with said sixth storage area; the second storage area, the third storage area, the fifth storage area and the sixth storage area are communicated to the heat exchange chamber and are respectively used for storing refrigerants with corresponding temperature and pressure.
9. The heat exchange system according to claim 8, wherein the dual-stage compressor assembly (1) further comprises an aeration valve (22); the air compensating valve (22) is communicated with the flash tank (21) and the pipeline adjusting mechanism (34); the air compensating valve (22) is used for adjusting the air inlet amount entering the flash tank (21).
10. The heat exchange system according to claim 1, wherein the switching mechanism comprises a three-way reversing valve (33), and a first port (331), a second port (332) and a third port (333) are arranged on the three-way reversing valve (33); the first port (331) is in communication with a compressor discharge of the dual stage compressor assembly (1); the second port (332) is in communication with the single stage compressor assembly (2) compressor suction and the third port (333) is in communication with the first heat exchanger (4).
11. The heat exchange system according to claim 3, wherein the switching mechanism further comprises a first control valve (31) and a second control valve (32), the outlet end of the second heat exchanger (7) being in communication with the compressor suction of the single stage compressor assembly (2) via a first conduit; the outlet end of the second heat exchanger (7) is communicated with a compressor suction port of the double-stage compressor assembly (1) through a second pipeline; the first control valve (31) is arranged on the first pipeline, and the first control valve (31) is used for controlling the on-off of the first pipeline; the second control valve (32) is arranged on a second pipeline, and the second control valve (32) is used for controlling the on-off of the second pipeline.
12. The heat exchange system of claim 11, wherein the switching mechanism comprises a line conditioning mechanism (34); the pipeline adjusting mechanism (34) comprises a first gas-liquid separator and a second gas-liquid separator; the first gas-liquid separator is communicated with the first throttling device (5) and the flash tank (21) through a fifth pipeline; a fifth control valve is arranged on the fifth pipeline and used for controlling the on-off of the fifth pipeline; the second gas-liquid separator is communicated with a compressor exhaust port of the double-stage compressor assembly (1) and a compressor suction port of the single-stage compressor assembly (2) through a sixth pipeline; and a sixth control valve is arranged on the sixth pipeline and used for controlling the on-off of the sixth pipeline.
13. The heat exchange system according to claim 12, wherein the pipeline adjusting mechanism (34) further comprises a third pipeline, a fourth pipeline and a seventh pipeline, wherein the third pipeline is communicated with the inlet ends of the first throttling device (5) and the second heat exchanger (7); the fourth pipeline is communicated with the first throttling device (5) and the second throttling device (6); the seventh pipeline is communicated with a compressor exhaust port of the double-stage compressor assembly (1) and the first heat exchanger (4); a third control valve is arranged on the third pipeline and used for controlling the on-off of the third pipeline; a fourth control valve is arranged on the fourth pipeline and used for controlling the on-off of the fourth pipeline; and a seventh control valve is arranged on the seventh pipeline and used for controlling the on-off of the seventh pipeline.
14. A method for controlling a heat exchange system according to any one of claims 1 to 13, comprising:
detecting a temperature-controlled load Δ TNegative poleThe temperature adjusting load is cold or heat quantity which is required to be supplied to the indoor space for adjusting the environment temperature to be preset temperature;
according to the tempering load Delta TNegative poleAnd controlling the heat exchange system to switch among a first working state, a second working state and a third working state.
15. The method of controlling a heat exchange system according to claim 14, wherein the detected attemperation load Δ TNegative poleComprises the following steps:
detecting the ambient temperature T in the roomRing (C)；
According to the ambient temperature TRing (C)And a predetermined temperature TPreparation ofThe difference in temperature determines the tempering load.
16. The method of claim 14, wherein the delta T is a temperature dependent loadNegative poleThe step of controlling the working state of the heat exchange system comprises the following steps:
determination of Delta TNegative poleAnd a first predetermined load Δ T1Preparation ofAnd a second preset load Δ T2Preparation ofThe relationship of (1);
according to the tempering load Delta TNegative poleAnd a first predetermined load Δ T1Preparation ofAnd a second preset load Δ T2Preparation ofControls the working state of the heat exchange system.
17. The method of claim 16, wherein the delta T is a temperature dependent loadNegative poleAnd a first predetermined load Δ T1Preparation ofAnd a second preset load Δ T2Preparation ofThe step of controlling the working state of the heat exchange system comprises the following steps:
when Δ TNegative pole<ΔT2Preparation ofWhen the heat exchange system is in the first working state, the heat exchange system is controlled to enter the first working state;
when Δ T2Preparation of≦ΔTNegative pole<ΔT1Preparation ofWhen the heat exchange system is in the first working state, controlling the heat exchange system to enter a second working state;
when Δ TNegative pole≧ΔT1Preparation ofWhen the heat exchange system is in the third working state, the heat exchange system is controlled to enter the third working state; wherein Δ T2Preparation of<ΔT1Preparation of。
18. The control method of the heat exchange system according to claim 17, characterized in that when the heat exchange system is in the first working state, the first control valve (31) is controlled to be closed, the second control valve (32) is controlled to be opened, the first port (331), the second port (332) and the third port (333) of the three-way reversing valve (33) are controlled to be closed, the first passage (341) and the fifth passage (345) are controlled to be opened, the second passage (342), the third passage (343), the fourth passage (344) and the sixth passage (346) are controlled to be closed, the two-stage compressor assembly (1) is unloaded, the single-stage compressor assembly (2) is loaded, the first throttling device (5) is communicated with the second heat exchanger (7), and the outlet end of the second heat exchanger (4) is communicated to the compressor suction port of the single-stage compressor assembly (2);
when the heat exchange system is in a second working state, the first control valve (31) is controlled to be closed, and the second control valve (32) is controlled to be opened; simultaneously controlling a first port (331) and a third port (333) of the three-way reversing valve (33) to be opened, and a second port (332) to be closed; the first channel (341), the second channel (342), the third channel (343), the fourth channel (344) and the sixth channel (346) are controlled to be opened, the fifth channel (345) is closed, the double-stage compressor assembly (1) is loaded, the single-stage compressor assembly (2) is unloaded, a compressor exhaust port of the double-stage compressor assembly (1) is communicated with the first heat exchanger (4), and the outlet end of the first throttling device (5) is communicated with the second throttling device (6) and the air replenishing valve;
when the heat exchange system is in a third working state, the first control valve (31) and the second control valve (32) are controlled to be closed, the first port (331) and the second port (332) of the three-way reversing valve (33) are controlled to be opened, and the third port (333) is controlled to be closed; and controlling a first channel (341), a second channel (342), a third channel (343), a fourth channel (344) and a sixth channel (346) to be opened, closing a fifth channel (345), loading both the double-stage compressor assembly (1) and the single-stage compressor assembly (2), communicating a compressor exhaust port of the double-stage compressor assembly (1) with a compressor suction port of the single-stage compressor assembly (2), and communicating an outlet end of the first throttling device (5) with a second throttling device (6) and an air replenishing valve.
19. The method of claim 17, wherein when the heat exchange system is in the first operating state, the third control valve is controlled to be closed, and the third pipeline is communicated; the fourth control valve, the fifth control valve, the sixth control valve and the seventh control valve are controlled to be disconnected, the fourth pipeline, the fifth pipeline, the sixth pipeline and the seventh pipeline are disconnected, and the first throttling device (5) is communicated with the second heat exchanger (7);
when the heat exchange system is in a second working state, the fourth control valve, the fifth control valve and the seventh control valve are controlled to be closed, and the fourth pipeline, the fifth pipeline and the seventh pipeline are communicated; the third control valve and the sixth control valve are controlled to be disconnected, the third pipeline and the sixth pipeline are disconnected, the first throttling device (5) is communicated with the second throttling device (6), a compressor exhaust port of the double-stage compressor assembly (1) is communicated with the first heat exchanger (4), and the first throttling device (5) is communicated with the flash tank (21);
when the heat exchange system is in a third working state, the fourth control valve, the fifth control valve and the sixth control valve are controlled to be closed, and the fourth pipeline, the fifth pipeline and the sixth pipeline are communicated; controlling the third control valve and the seventh control valve to be disconnected, the third pipeline and the seventh pipeline to be disconnected, and the third pipeline and the sixth pipeline to be disconnected; the first throttling device (5) is communicated with the second throttling device (6), the outlet end of the second heat exchanger (7) is communicated with a compressor suction port of the double-stage compressor assembly (1), and the first throttling device (5) is communicated with the flash tank (21).
20. The method of controlling a heat exchange system according to claim 14, further comprising:
detecting temperature T of refrigerant in refrigerant heat exchange memberColdAnd pressure PCold；
According to TColdAnd PColdAnd controlling the refrigerant in the heat exchange chamber to enter the corresponding storage area according to the relation between the preset temperature value and the preset pressure value.
21. The method of claim 20, wherein the function T is TColdAnd PColdThe step of controlling the refrigerant in the heat exchange chamber to enter the corresponding storage area according to the relation between the preset temperature value and the preset pressure value comprises the following steps:
when T1Preparation of≦TCold<T2Preparation ofAnd P1Preparation of≦P2Cold<P2Preparation ofWhen the refrigerant enters the second storage area, the refrigerant is controlled to enter the second storage area; wherein P1Preparation ofAnd P2Preparation ofFor the preset value of the pressure in the second passage (342), T1Preparation ofAnd T2Preparation ofIs a preset value of the temperature of the second channel (342);
when T2Preparation of≦TCold<T3Preparation ofAnd P2Preparation of≦P2Cold<P3Preparation ofWhen the refrigerant enters the third storage area, the refrigerant is controlled to enter the third storage area; wherein P2Preparation ofAnd P3Preparation ofFor the preset value of the pressure in the third channel (343), T2Preparation ofAnd T3Preparation ofIs a preset value of the temperature of the third channel (343);
when T4Preparation of≦TCold<T5Preparation ofAnd P4Preparation of≦P2Cold<P5Preparation ofMeanwhile, controlling the refrigerant to enter a fifth storage area; wherein P4Preparation ofAnd P5Preparation ofA preset value of pressure for the fifth channel (345), T4Preparation ofAnd T5Preparation ofIs a preset value of the temperature of the fifth channel (345);
when T5Preparation of≦TCold<T6Preparation ofAnd P5Preparation of≦P2Cold<P6Preparation ofWhen the refrigerant enters the sixth storage area, the refrigerant is controlled to enter the sixth storage area; wherein P5Preparation ofAnd P6Preparation ofFor the pressure preset value of the sixth channel (346), T5Preparation ofAnd T6Preparation ofIs a temperature preset value of the sixth channel (346); wherein T3Preparation of<T4Preparation of<T5Preparation of<T6Preparation of<T1Preparation of<T2Preparation of；P3Preparation of<P4Preparation of<P5Preparation of<P6Preparation of<P1Preparation of<P2Preparation of。
22. An air conditioner comprising a heat exchange system according to any one of claims 1 to 13.
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CN106885389A (en) * 2017-03-24 2017-06-23 广东美芝精密制造有限公司 Refrigerating plant
CN107860151A (en) * 2017-10-31 2018-03-30 珠海格力电器股份有限公司 Heat pump and there is its air conditioner

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CN111609479A (en) * 2020-04-23 2020-09-01 海信（山东）空调有限公司 Air conditioner
CN111609479B (en) * 2020-04-23 2021-05-28 海信（山东）空调有限公司 Air conditioner
CN114183862A (en) * 2021-12-21 2022-03-15 宁波奥克斯电气股份有限公司 Air conditioning system with single-stage compression switching function and double-stage compression switching control method
CN114475156A (en) * 2022-02-17 2022-05-13 岚图汽车科技有限公司 Automobile heat management system and automobile
CN114475156B (en) * 2022-02-17 2023-11-03 岚图汽车科技有限公司 Automobile heat management system and automobile
CN114485254A (en) * 2022-02-18 2022-05-13 佳木斯大学 Uniform heat exchange control method for aircraft equipment
CN114485254B (en) * 2022-02-18 2023-10-10 佳木斯大学 Uniform heat exchange control method for aircraft equipment

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