CN111765567B - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN111765567B CN111765567B CN202010633320.6A CN202010633320A CN111765567B CN 111765567 B CN111765567 B CN 111765567B CN 202010633320 A CN202010633320 A CN 202010633320A CN 111765567 B CN111765567 B CN 111765567B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000007791 dehumidification Methods 0.000 claims abstract description 44
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims description 20
- 230000007704 transition Effects 0.000 claims description 18
- 238000005057 refrigeration Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 description 18
- 239000003507 refrigerant Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 10
- 230000008020 evaporation Effects 0.000 description 8
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000003303 reheating Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000002301 combined effect Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
-
- 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
- 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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
-
- 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
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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
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an air conditioning system and a control method thereof, wherein the air conditioning system comprises: the device comprises a compressor, an outdoor heat exchanger, a first indoor heat exchanger and a second indoor heat exchanger; the air conditioning system further comprises a first branch and a second branch, one end of the first branch is communicated to the first pipeline, and the other end of the first branch is communicated to the second pipeline; one end of the second branch is communicated to the first pipeline, and the other end of the second branch is communicated to the second pipeline and is positioned between the second indoor heat exchanger and the compressor; the first indoor heat exchanger and the second indoor heat exchanger are arranged side by side, and air flow can sequentially flow through the second indoor heat exchanger and the first indoor heat exchanger to complete heat exchange. According to the invention, the temperature of the indoor air can be effectively increased under the condition of evaporating, cooling and dehumidifying the indoor air through the combined action of the evaporator and the reheater, so that the air outlet temperature of the air conditioner is not too low due to dehumidification, and the condition of lowering indoor comfort is avoided.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system and a control method thereof.
Background
In order to meet the dehumidification requirement, the conventional refrigeration and air conditioning system shown in fig. 1 generally needs to lower the evaporator temperature to a larger extent than the return air dew point temperature during summer refrigeration.
From the viewpoint of indoor environment comfort, when the conventional air conditioning system heats in summer, particularly in the southern plum rainy season or in the "return to the south" when dehumidification operation is required, the problems of uncomfortable feeling of human body caused by low air outlet temperature and indoor temperature can occur.
From the angle of energy efficiency of the air conditioning system, under the condition of a certain condensing temperature of the system: the lower the evaporating temperature, i.e. the greater the compressor suction to discharge pressure ratio, the lower the energy efficiency of the system. In order to solve the problem of low energy efficiency of the system caused by large temperature difference between the return air temperature and the evaporating temperature in the operation of the air conditioning system, a dual-evaporating-temperature system is proposed in the patent number CN105115181B, as shown in fig. 2, namely, two high-temperature evaporators and two low-temperature evaporators are respectively arranged in a single or same heat exchange channel, indoor return air is subjected to heat exchange through the high-temperature evaporators and the low-temperature evaporators successively, and meanwhile, outlets of the two evaporators are respectively connected with two independent compression cylinders of the compressor, so that the evaporating temperature of the high-temperature evaporators is higher than that of a conventional system, and the energy efficiency of the system is improved. However, the system also has the condition that the temperature of the air outlet running in the dehumidification mode is too low, so that the comfort of a human body is affected.
The problem that the air-conditioning system in the prior art is easy to cause the reduction of comfort due to the excessively low air-out temperature of the air conditioner when the air-conditioning system is operated in a dehumidification mode in a transition season in a damp-hot area; and the air conditioning system has the technical problems that the evaporation temperature is too low during refrigeration and dehumidification operation, the system operation energy efficiency is too low, and the like, so the invention designs the air conditioning system and the control method thereof.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the comfort is reduced easily caused by the too low air outlet temperature of the air conditioner when the air conditioner system in the prior art operates in a dehumidification mode in a transition season of a damp-heat region, so as to provide the air conditioner system and the control method thereof.
In order to solve the above problems, the present invention provides an air conditioning system comprising:
The device comprises a compressor, an outdoor heat exchanger, a first indoor heat exchanger and a second indoor heat exchanger;
The first pipeline is provided with a first throttling device, and the second pipeline is provided with a second throttling device;
the air conditioning system further comprises a first branch and a second branch, one end of the first branch is communicated to the first pipeline and is positioned between the first indoor heat exchanger and the compressor, and the other end of the first branch is communicated to the second pipeline and is positioned between the junction of the second pipeline and the first pipeline and the second throttling device; one end of the second branch is communicated to the first pipeline and is positioned between the first indoor heat exchanger and the compressor, and the other end of the second branch is communicated to the second pipeline and is positioned between the second indoor heat exchanger and the compressor;
The first indoor heat exchanger and the second indoor heat exchanger are arranged side by side, and air flow can sequentially flow through the second indoor heat exchanger and the first indoor heat exchanger to complete heat exchange.
Preferably, a third two-way valve is arranged on the first branch, a second two-way valve is arranged on the second branch, a fourth two-way valve is also arranged on the second pipeline at a position between the intersection with the first pipeline and the intersection with the first branch, and a first two-way valve is also arranged on the first pipeline at a position between the intersection with the first branch and the intersection with the second branch; or a first three-way valve is arranged at the junction of the first branch and the second pipeline, and a second three-way valve is arranged at the junction of the second branch and the first pipeline.
Preferably, the compressor includes a first cylinder and a second cylinder;
The first cylinder has a first intake port and a first exhaust port, and the second cylinder has a second intake port and a second exhaust port: the outdoor heat exchanger can be simultaneously communicated to the first exhaust port and the second exhaust port, the first indoor heat exchanger can be communicated to the first air suction port, and the second indoor heat exchanger can be communicated to the second air suction port; or the outdoor heat exchanger can be simultaneously communicated with the first air suction port and the second air suction port, the first indoor heat exchanger can be communicated with the first air exhaust port, and the second indoor heat exchanger can be communicated with the second air exhaust port;
or the first cylinder is provided with a first air suction port, the second cylinder is provided with a second air suction port, and the air discharged by the first cylinder and the air discharged by the second cylinder are mixed in the shell of the compressor and then discharged through a third air discharge port: the outdoor heat exchanger can be communicated with the third exhaust port, the first indoor heat exchanger can be communicated with the first air suction port, and the second indoor heat exchanger can be communicated with the second air suction port; or the outdoor heat exchanger can be simultaneously communicated with the first air suction port and the second air suction port, the first indoor heat exchanger can be communicated with the third air exhaust port, and the second indoor heat exchanger can also be communicated with the third air exhaust port.
Preferably, the valve further comprises a first four-way valve and a second four-way valve:
four ports of the first four-way valve are respectively communicated with the first air suction port, the first exhaust port, the outdoor heat exchanger and the first indoor heat exchanger, and four ports of the second four-way valve are respectively communicated with the second air suction port, the second exhaust port, the outdoor heat exchanger and the second indoor heat exchanger;
Or when the third exhaust port is included, the four ports of the first four-way valve are respectively communicated with the first air suction port, the third exhaust port, the outdoor heat exchanger and the first indoor heat exchanger, and the four ports of the second four-way valve are respectively communicated with the second air suction port, the third exhaust port, the outdoor heat exchanger and the second indoor heat exchanger.
Preferably, when the second exhaust port is included, the air conditioning system further includes an oil return device disposed at the second exhaust port to enable oil in the gas exhausted from the second exhaust port to return to the bottom of the inner cavity of the compressor.
Preferably, the oil return device comprises an oil separator and an oil return assembly, the second exhaust port is communicated with the oil separator through an exhaust pipeline, the bottom of the oil separator is communicated to the bottom of an inner cavity of the compressor through an oil return pipeline, and the oil return assembly comprises a first oil return control valve arranged on the oil return pipeline; or alternatively
The oil return device comprises an oil separator and an oil return assembly, the second exhaust port is communicated with the oil separator through an exhaust pipeline, the bottom of the oil separator is communicated to the bottom of an inner cavity of the compressor through an oil return pipeline, the oil return assembly comprises a second oil return control valve arranged on the oil return pipeline and a parallel pipeline connected with the second oil return control valve in parallel, and an oil return capillary tube is arranged on the parallel pipeline.
Preferably, the first throttling device is a fully-opened conductive electronic expansion valve; and/or the second throttling device is a full-open throttling electronic expansion valve.
The invention also provides a control method suitable for the air conditioning system in any one of the previous claims, which comprises the following steps:
a detection step for detecting an operation mode of the air conditioning system;
Judging, namely judging which of the plurality of modes the operation mode of the current air conditioner belongs to, wherein the operation mode comprises a refrigeration mode, a summer high-temperature environment dehumidification mode, a heating mode and a wet and hot region transition season operation dehumidification mode;
a control step, when the air conditioning system operates in a dehumidification mode in a transition season of a damp-heat region:
When the throttle valve comprises a first two-way valve, a second two-way valve, a third two-way valve and a fourth two-way valve, the first two-way valve is controlled to be closed, the second two-way valve is controlled to be opened, the third two-way valve is controlled to be opened, the fourth two-way valve is controlled to be closed, the opening of the first throttle device is controlled to be adjusted to the maximum opening, and the second throttle device throttles normally;
When the first three-way valve and the second three-way valve are included, the first three-way valve is controlled to enable the first branch to be conducted, the junction of the second pipeline and the first pipeline is disconnected from a pipe section between the first three-way valve, the second three-way valve is controlled to enable the second branch to be conducted, the junction of the first pipeline and the first branch is disconnected from the pipe section between the junction of the first pipeline and the second branch, and meanwhile the opening of the first throttling device is controlled to be adjusted to the maximum opening, and the second throttling device throttles normally.
Preferably, the controlling step is further configured to, when the air conditioning system is operating in the cooling mode:
when the first, second, third and fourth two-way valves are included, the first, second, third and fourth two-way valves are controlled to be opened, the second, fourth two-way valves are controlled to be closed, and the first throttling device is controlled to normally throttle at the same time;
When the first three-way valve and the second three-way valve are included, the first three-way valve is controlled to enable the first branch to be disconnected, the junction of the second pipeline and the first pipeline is connected with a pipe section between the first three-way valve, the second three-way valve is controlled to enable the second branch to be disconnected, the junction of the first pipeline and the first branch is connected with the pipe section between the junction of the first pipeline and the second branch, and meanwhile the first throttling device is controlled to normally throttle, and the second throttling device is controlled to normally throttle.
Preferably, the controlling step is further configured to, when the air conditioning system is operating in a summer high temperature environment dehumidification mode:
when the first, second, third and fourth two-way valves are included, the first, second, third and fourth two-way valves are controlled to be opened, the second, fourth two-way valves are controlled to be closed, and the first throttling device is controlled to normally throttle at the same time;
When the first three-way valve and the second three-way valve are included, the first three-way valve is controlled to enable the first branch to be disconnected, the junction of the second pipeline and the first pipeline is connected with a pipe section between the first three-way valve, the second three-way valve is controlled to enable the second branch to be disconnected, the junction of the first pipeline and the first branch is connected with the pipe section between the junction of the first pipeline and the second branch, and meanwhile the first throttling device is controlled to normally throttle, and the second throttling device is controlled to normally throttle.
Preferably, the controlling step is further configured to, when the air conditioning system is operating in the heating mode:
when the first, second, third and fourth two-way valves are included, the first, second, third and fourth two-way valves are controlled to be opened, the second, fourth two-way valves are controlled to be closed, and the first throttling device is controlled to normally throttle at the same time;
When the first three-way valve and the second three-way valve are included, the first three-way valve is controlled to enable the first branch to be disconnected, the junction of the second pipeline and the first pipeline is connected with a pipe section between the first three-way valve, the second three-way valve is controlled to enable the second branch to be disconnected, the junction of the first pipeline and the first branch is connected with the pipe section between the junction of the first pipeline and the second branch, and meanwhile the first throttling device is controlled to normally throttle, and the second throttling device is controlled to normally throttle.
The air conditioning system and the control method thereof provided by the invention have the following beneficial effects:
1. According to the invention, by arranging the first branch and the second branch, an effective short circuit effect can be formed on the pipe section between the junction of the first pipeline and the first branch and the junction of the first pipeline and the second branch, and an effective short circuit effect can be formed on the pipe section between the junction of the second pipeline and the junction of the first pipeline and the junction of the second pipeline and the first branch, so that the first branch and the second branch can be conducted simultaneously under the condition of relatively high indoor humidity in a transitional season, the first indoor heat exchanger and the second indoor heat exchanger are connected in series, the first throttling device connected with the first indoor heat exchanger positioned downstream of air-air flow is controlled to be fully opened, no throttling is formed, the first indoor heat exchanger can effectively achieve the effect of heating air (a reheater), the second indoor heat exchanger can cool air, the indoor air temperature can be effectively increased under the condition of effectively evaporating, cooling and dehumidifying the indoor air through the combined effect of the evaporator and the reheater, and the air outlet temperature of the air conditioner is not reduced excessively and the indoor comfort condition is avoided;
2. In addition, the invention also arranges two evaporators at the evaporator side, and improves the evaporation temperature at the high temperature side by carrying out step cooling dehumidification treatment on indoor return air, so that the suction-exhaust pressure ratio is reduced, the power consumption is reduced, and the overall energy efficiency of the system is improved, namely, the running energy efficiency of the system is improved under the condition of effectively ensuring the refrigerating capacity and the dehumidifying capacity of the system; meanwhile, the temperature of the refrigerant at the outlet of the condenser (the first indoor heat exchanger is used as the condenser at the moment) is reduced under the working condition of high humidity in the transitional season, so that the cold out of the condenser is effectively increased, the refrigerating evaporation capacity is further improved, the energy efficiency of the system is further improved, and the indoor environment comfort is improved while the dehumidification effect is ensured;
3. The invention also provides a third two-way valve arranged on the first branch, a second two-way valve arranged on the second branch, and a fourth two-way valve arranged on the second pipeline and positioned between the junction with the first pipeline and the junction with the first branch, wherein the first two-way valve is also arranged on the first pipeline and positioned between the junction with the first branch and the junction with the second branch, or the first three-way valve is arranged on the junction between the first branch and the second pipeline, the second three-way valve is arranged on the junction between the second branch and the first pipeline, and the four-way valve or the two three-way valves arranged at different positions can be used for completing the control under different operation modes of the air conditioner, and especially the first branch and the second branch can be controlled to be conducted under the working condition of large humidity in a transition season.
Drawings
Fig. 1 is a system configuration diagram of a conventional single temperature air conditioning system according to the first prior art;
FIG. 2 is a system configuration diagram of a conventional single temperature air conditioning system according to the second prior art;
FIG. 3 is a system configuration diagram of an air conditioning system according to the present invention in a cooling mode of a main embodiment;
Fig. 4 is a system configuration diagram of an air conditioning system according to the present invention in a heating mode of a main embodiment;
FIG. 5 is a system configuration diagram of the main embodiment of the air conditioning system of the present invention in a transient season dehumidification mode (higher humidity condition);
FIG. 6 is a system configuration diagram of an alternative embodiment of an air conditioning system according to the present invention in a cooling mode;
FIG. 7 is a system configuration diagram of an alternative embodiment of an air conditioning system according to the present invention in a heating mode;
FIG. 8 is a block diagram of a system in a transient season dehumidification mode (higher humidity condition) in accordance with an alternative embodiment of the air conditioning system of the present disclosure;
FIG. 9 is a block diagram of a system in a dehumidification mode (higher humidity condition) of an alternative embodiment of an air conditioning system according to the present invention;
fig. 10 is a system configuration diagram of an alternative embodiment of the air conditioning system according to the present invention in a dehumidification mode (higher humidity condition) in three transition seasons.
The reference numerals are expressed as:
1. a compressor; 101. a first air suction port; 102. a second air suction port; 103. a second exhaust port; 104. a first exhaust port; 105. a third exhaust port; 106. a first pipeline; 107. a second pipeline; 108. a third pipeline; 109. a first branch; 110. a second branch; 2. a first four-way valve; 3. a second four-way valve; 4. an outdoor heat exchanger; 5. a stop valve for the connecting pipe of the inner and outer machines; 501. a second inner and outer machine connecting pipe stop valve; 502. a third inner and outer machine connecting pipe stop valve; 6. a first throttle device; 7. a second throttle device; 8. a first indoor heat exchanger; 9. a second indoor heat exchanger; 10. a first two-way valve; 11. a second two-way valve; 12. a third two-way valve; 13. a fourth two-way valve; 14. an oil separator; 15. a first three-way valve; 16. and a second three-way valve.
Detailed Description
As shown in fig. 3 to 10, the present invention provides an air conditioning system, comprising:
a compressor 1, an outdoor heat exchanger 4, a first indoor heat exchanger 8 and a second indoor heat exchanger 9;
The first pipeline 106 where the first indoor heat exchanger 8 is located and the second pipeline 107 where the second indoor heat exchanger 9 is located are converged and then are communicated to the outdoor heat exchanger 4 through a third pipeline 108, a first throttling device 6 is arranged on the first pipeline 106, and a second throttling device 7 is arranged on the second pipeline 107;
The air conditioning system further comprises a first branch 109 and a second branch 110, wherein one end of the first branch 109 is communicated with the first pipeline 106 and is positioned between the first indoor heat exchanger 8 and the compressor 1, and the other end of the first branch 109 is communicated with the second pipeline 107 and is positioned between the junction of the second pipeline 107 and the first pipeline 106 and the second throttling device 7; one end of the second branch 110 is connected to the first pipeline 106 and is located at a position between the first indoor heat exchanger 8 and the compressor 1, and the other end of the second branch 110 is connected to the second pipeline 107 and is located at a position between the second indoor heat exchanger 9 and the compressor 1;
the first indoor heat exchanger 8 and the second indoor heat exchanger 9 are arranged side by side, and air flow can sequentially flow through the second indoor heat exchanger 9 and the first indoor heat exchanger 8 to complete heat exchange.
According to the invention, by arranging the first branch and the second branch, an effective short circuit effect can be formed on the pipe section between the junction of the first pipeline and the first branch and the junction of the first pipeline and the second branch, and an effective short circuit effect can be formed on the pipe section between the junction of the second pipeline and the junction of the first pipeline and the junction of the second pipeline and the first branch, so that the first branch and the second branch can be conducted simultaneously under the condition of relatively high indoor humidity in a transitional season, the first indoor heat exchanger and the second indoor heat exchanger are connected in series, the first throttling device connected with the first indoor heat exchanger positioned downstream of air-air flow is controlled to be fully opened, no throttling is formed, the first indoor heat exchanger can effectively achieve the effect of heating air (a reheater), the second indoor heat exchanger can cool air, the indoor air temperature can be effectively increased under the condition of effectively evaporating, cooling and dehumidifying the indoor air through the combined effect of the evaporator and the reheater, and the air outlet temperature of the air conditioner is not reduced excessively and the indoor comfort condition is avoided;
In addition, the invention also arranges two evaporators at the evaporator side, and improves the evaporation temperature at the high temperature side by carrying out step cooling dehumidification treatment on indoor return air, so that the suction-exhaust pressure ratio is reduced, the power consumption is reduced, and the overall energy efficiency of the system is improved, namely, the running energy efficiency of the system is improved under the condition of effectively ensuring the refrigerating capacity and the dehumidifying capacity of the system; simultaneously, the temperature of the refrigerant at the outlet of the condenser (the first indoor heat exchanger is used as the condenser at the moment) is reduced under the working condition of high humidity in the transitional season, the cold out of the condenser is effectively increased, the refrigerating evaporation capacity is further improved, the energy efficiency of the system is further improved, and the indoor environment comfort is improved while the dehumidification effect is ensured.
Preferably, in the main embodiment, as shown in fig. 3-5, the first branch 109 is provided with a third two-way valve 12, the second branch 110 is provided with a second two-way valve 11, a fourth two-way valve 13 is further provided on the second pipeline 107 at a position between the junction with the first pipeline 106 and the junction with the first branch 109, and a first two-way valve 10 is further provided on the first pipeline 106 at a position between the junction with the first branch 109 and the junction with the second branch 110; or in the alternative, as shown in fig. 9-10, a first three-way valve 15 is disposed at the junction of the first branch 109 and the second pipeline 107, and a second three-way valve 16 is disposed at the junction of the second branch 110 and the first pipeline 106.
The invention also provides a third two-way valve arranged on the first branch, a second two-way valve arranged on the second branch, and a fourth two-way valve arranged on the second pipeline and positioned between the junction with the first pipeline and the junction with the first branch, wherein the first two-way valve is also arranged on the first pipeline and positioned between the junction with the first branch and the junction with the second branch, or the first three-way valve is arranged on the junction between the first branch and the second pipeline, the second three-way valve is arranged on the junction between the second branch and the first pipeline, and the four-way valve or the two three-way valves arranged at different positions can be used for completing the control under different operation modes of the air conditioner, and especially the first branch and the second branch can be controlled to be conducted under the working condition of large humidity in a transition season.
Preferably, the compressor 1 comprises a first cylinder and a second cylinder;
3-5, the first cylinder has a first intake port 101 and a first exhaust port 104, and the second cylinder has a second intake port 102 and a second exhaust port 103: the outdoor heat exchanger 4 can be simultaneously communicated to the first exhaust port 104 and the second exhaust port 103, the first indoor heat exchanger 8 can be communicated to the first air suction port 101, and the second indoor heat exchanger 9 can be communicated to the second air suction port 102; or the outdoor heat exchanger 4 may be simultaneously connected to the first air inlet 101 and the second air inlet 102, the first indoor heat exchanger 8 may be connected to the first air outlet 104, and the second indoor heat exchanger 9 may be connected to the second air outlet 103;
or in the first alternative embodiment, as shown in fig. 6-8, in the second alternative embodiment, as shown in fig. 10, the first cylinder has a first air suction port 101, the second cylinder has a second air suction port 102, and the air discharged by the first cylinder and the air discharged by the second cylinder are mixed inside the shell of the compressor and then discharged through a third air discharge port 105: the outdoor heat exchanger 4 may be connected to the third exhaust port 105, the first indoor heat exchanger 8 may be connected to the first air intake port 101, and the second indoor heat exchanger 9 may be connected to the second air intake port 102; or the outdoor heat exchanger 4 may be simultaneously connected to the first air inlet 101 and the second air inlet 102, the first indoor heat exchanger 8 may be connected to the third air outlet 105, and the second indoor heat exchanger 9 may also be connected to the third air outlet 105.
According to the invention, by arranging the compressors of at least two independent cylinders, the first indoor heat exchanger communicated with the first cylinder, the second indoor heat exchanger communicated with the second cylinder, the first throttling device arranged on the first pipeline between the outdoor heat exchanger and the first indoor heat exchanger and the second throttling device arranged on the second pipeline between the outdoor heat exchanger and the second indoor heat exchanger, double-temperature evaporation can be effectively realized, and by carrying out step cooling dehumidification treatment on indoor return air, the evaporation temperature at the high temperature side is increased, and the corresponding suction pressure is increased, so that the suction-exhaust pressure ratio is reduced, the power consumption is reduced, and the overall energy efficiency of the system is improved, namely, the operation energy efficiency of the system is improved under the condition that the refrigerating capacity and the dehumidifying capacity of the system are effectively ensured; simultaneously, the temperature of the refrigerant at the outlet of the condenser (the first indoor heat exchanger is used as the condenser at the moment) is reduced under the working condition of high humidity in the transitional season, the cold out of the condenser is effectively increased, the refrigerating evaporation capacity is further improved, the energy efficiency of the system is further improved, and the indoor environment comfort is improved while the dehumidification effect is ensured.
Preferably, the device further comprises a first four-way valve 2 and a second four-way valve 3:
Four ports of the first four-way valve 2 are respectively communicated with the first air suction port, the first air exhaust port, the outdoor heat exchanger 4 and the first indoor heat exchanger 8, and four ports of the second four-way valve 3 are respectively communicated with the second air suction port, the second air exhaust port, the outdoor heat exchanger 4 and the second indoor heat exchanger 9;
Or when a third exhaust port is included, the four ports of the first four-way valve 2 are respectively communicated to the first air suction port, the third exhaust port, the outdoor heat exchanger 4 and the first indoor heat exchanger 8, and the four ports of the second four-way valve 3 are respectively communicated to the second air suction port, the third exhaust port, the outdoor heat exchanger 4 and the second indoor heat exchanger 9.
The double-temperature air conditioning system is in a further preferable structural form, the first indoor heat exchanger can be effectively switched as a refrigerating working condition and a heating working condition through the first four-way valve, and the second indoor heat exchanger can be effectively switched as a refrigerating working condition and a heating working condition through the second four-way valve.
Preferably, when the second exhaust port is included, the air conditioning system further includes an oil return device disposed at the second exhaust port 103 so as to be capable of returning oil in the gas exhausted from the second exhaust port to the bottom of the inner cavity of the compressor 1. The oil return device can effectively realize oil return of the compressor.
Preferably, the oil return device comprises an oil separator 14 and an oil return assembly, the second exhaust port is communicated with the oil separator 14 through an exhaust pipeline, the bottom of the oil separator 14 is communicated to the bottom of the inner cavity of the compressor 1 through an oil return pipeline, and the oil return assembly comprises a first oil return control valve arranged on the oil return pipeline; the oil return device is in a preferable structural form of the embodiment 1 of the oil return device, the opening and closing of the oil return passage can be effectively controlled through the arrangement of the first oil return control valve and the oil return pipeline, and an effective oil return effect can be achieved when oil return is needed.
Or alternatively
The oil return device comprises an oil separator 14 and an oil return assembly, the second exhaust port is communicated with the oil separator 14 through an exhaust pipeline, the bottom of the oil separator 14 is communicated to the bottom of an inner cavity of the compressor 1 through an oil return pipeline, the oil return assembly comprises a second oil return control valve arranged on the oil return pipeline and a parallel pipeline connected with the second oil return control valve in parallel, and an oil return capillary tube is arranged on the parallel pipeline. The oil return device is in the preferred structural form of the embodiment 2 of the oil return device, the opening and closing of the oil return passage can be effectively controlled through the arrangement of the second oil return control valve and the oil return pipeline, an effective oil return effect (high flow rate) can be achieved when oil return is needed, an oil return effect (low flow rate) with throttling degree can be achieved through the oil return capillary tube when the second oil return control valve is closed, and the continuous and effective oil return process can be effectively guaranteed.
Preferably, the first throttling device 6 is a fully-opened and conductive electronic expansion valve; and/or, the second throttling device 7 is a full-open throttling electronic expansion valve. The fully-opened and conducted electronic expansion valve is large in flow cross section area when the opening degree of the fully-opened and conducted electronic expansion valve is fully opened, has no throttling function, can play a role of a connecting pipe, ensures that the fully-opened and non-throttled electronic expansion valve is fully opened, and can play a role of throttling when a second throttling device serving as the fully-opened and throttled electronic expansion valve is fully conducted, so that the first throttling device is fully conducted, the heating (reheating) function of the first indoor heat exchanger when the humidity is high is ensured, the air outlet temperature of an air conditioner is improved, and the indoor comfort level is improved.
The invention provides a control method suitable for an air conditioning system, which comprises the following steps:
a detection step for detecting an operation mode of the air conditioning system;
Judging, namely judging which of the plurality of modes the operation mode of the current air conditioner belongs to, wherein the operation mode comprises a refrigeration mode, a summer high-temperature environment dehumidification mode, a heating mode and a wet and hot region transition season operation dehumidification mode;
a control step, when the air conditioning system operates in a dehumidification mode in a transition season of a damp-heat region:
When the first, second, third and fourth two-way valves are included, the first, second, third and fourth two-way valves 10, 11, 12 and 13 are controlled to be closed, and the opening of the first throttle device 6 is controlled to be adjusted to the maximum opening, and the second throttle device 7 is controlled to be throttled normally;
When the first three-way valve and the second three-way valve are included, the first three-way valve 15 is controlled to conduct the first branch 109, the junction of the second pipeline 107 and the first pipeline 106 is disconnected from the pipe section between the first three-way valve 15, the second three-way valve 16 is controlled to conduct the second branch 110, the junction of the first pipeline 106 and the first branch 109 is disconnected from the pipe section between the junction of the first pipeline 106 and the second branch 110, and the opening of the first throttling device 6 is controlled to be adjusted to the maximum opening, and the second throttling device 7 throttles normally.
The method is a preferable control method, namely, the first branch and the second branch are controlled to be conducted when the dehumidification mode is operated in a transition season of a damp-heat area, the first indoor heat exchanger and the second indoor heat exchanger are connected in series, the first indoor heat exchanger heats, the second indoor heat exchanger refrigerates, so that the temperature of indoor air can be effectively improved under the condition of evaporating, cooling and dehumidifying the indoor air, the air outlet temperature of the air conditioner is not too low due to dehumidification, the condition of indoor comfort is avoided, normal refrigeration or heating is completed by controlling the first indoor heat exchanger and the second indoor heat exchanger under the normal refrigeration working condition and the heating working condition, and the conversion of the functions of the heat exchangers under different operation modes is realized by the effective control method, so that an intelligent and effective control effect is formed.
Preferably, the controlling step is further configured to, when the air conditioning system is operating in the cooling mode:
When the first, second, third and fourth two-way valves are included, the first, second, third and fourth two-way valves 10, 11, 12 and 13 are controlled to be opened, and the first and second throttle devices 6, 7 are controlled to be normally throttled;
when the first three-way valve and the second three-way valve are included, the first three-way valve 15 is controlled so that the first branch 109 is disconnected, the junction of the second pipeline 107 and the first pipeline 106 is connected with the pipe section between the first three-way valve 15, the second three-way valve 16 is controlled so that the second branch 110 is disconnected, the junction of the first pipeline 106 and the first branch 109 is connected with the pipe section between the junction of the first pipeline 106 and the second branch 110, and the first throttling device 6 is controlled to normally throttle, and the second throttling device 7 is controlled to normally throttle.
The control method is a preferred control method of the invention, namely, the first branch and the second branch are controlled to be closed during the refrigeration mode, the first indoor heat exchanger and the second indoor heat exchanger are respectively communicated to the first air cylinder and the second air cylinder, the first indoor heat exchanger and the second indoor heat exchanger are refrigerated to evaporate and cool indoor air for refrigeration, and through the effective control means, the function conversion of the heat exchangers under different operation modes is realized to form intelligent and effective control effect.
Preferably, the controlling step is further configured to, when the air conditioning system is operating in a summer high temperature environment dehumidification mode:
When the first, second, third and fourth two-way valves are included, the first, second, third and fourth two-way valves 10, 11, 12 and 13 are controlled to be opened, and the first and second throttle devices 6, 7 are controlled to be normally throttled;
when the first three-way valve and the second three-way valve are included, the first three-way valve 15 is controlled so that the first branch 109 is disconnected, the junction of the second pipeline 107 and the first pipeline 106 is connected with the pipe section between the first three-way valve 15, the second three-way valve 16 is controlled so that the second branch 110 is disconnected, the junction of the first pipeline 106 and the first branch 109 is connected with the pipe section between the junction of the first pipeline 106 and the second branch 110, and the first throttling device 6 is controlled to normally throttle, and the second throttling device 7 is controlled to normally throttle.
The control method is a preferred control method, namely, the first branch and the second branch are controlled to be closed in a dehumidification mode of a high-temperature environment in summer, the first indoor heat exchanger and the second indoor heat exchanger are respectively communicated to the first air cylinder and the second air cylinder, the first indoor heat exchanger and the second indoor heat exchanger are refrigerated to evaporate and cool indoor air for refrigeration, and through the effective control means, the function conversion of the heat exchangers in different operation modes is realized to form intelligent and effective control effects.
Preferably, the controlling step is further configured to, when the air conditioning system is operating in the heating mode:
When the first, second, third and fourth two-way valves are included, the first, second, third and fourth two-way valves 10, 11, 12 and 13 are controlled to be opened, and the first and second throttle devices 6, 7 are controlled to be normally throttled;
when the first three-way valve and the second three-way valve are included, the first three-way valve 15 is controlled so that the first branch 109 is disconnected, the junction of the second pipeline 107 and the first pipeline 106 is connected with the pipe section between the first three-way valve 15, the second three-way valve 16 is controlled so that the second branch 110 is disconnected, the junction of the first pipeline 106 and the first branch 109 is connected with the pipe section between the junction of the first pipeline 106 and the second branch 110, and the first throttling device 6 is controlled to normally throttle, and the second throttling device 7 is controlled to normally throttle.
The control method is a preferred control method of the invention, namely, the first branch and the second branch are controlled to be closed during the heating mode, the first indoor heat exchanger and the second indoor heat exchanger are respectively communicated to the first air cylinder and the second air cylinder, and the first indoor heat exchanger and the second indoor heat exchanger are heated to condense and release heat for heating indoor air, and through the effective control means, the function conversion of the heat exchangers under different operation modes is realized, so that an intelligent and effective control effect is formed.
The refrigeration system shown in fig. 3 includes a compressor 1, two four-way reversing valves (a first four-way valve 2 and a second four-way valve 3), four two-way control valves (a first two-way valve 10, a second two-way valve 11, a third two-way valve 12 and a fourth two-way valve 13), an outdoor heat exchanger 4, two electronic expansion valves (a first throttling device 6 and a second throttling device 7), two indoor heat exchangers (a first indoor heat exchanger 8 and a second indoor heat exchanger 9), a stop valve between inner and outer connecting pipes (an inner and outer connecting pipe stop valve 5, a second inner and outer connecting pipe stop valve 501 and a third inner and outer connecting pipe stop valve 502), a fan provided in the vicinity of the heat exchangers, and the like.
The compressor 1 has two mutually independent compression cylinders, which are respectively connected with two air inlets (a first air inlet 101 and a second air inlet 102), the displacements of the two compression cylinders connected with the two air inlets are Va and Vb respectively, and the value of (Va/Vb) is between 0.5 and 2; the exhaust ports (a first exhaust port 104 and a second exhaust port 103) of the two compression cylinders are respectively connected with the air inlets (a first air inlet 101 and a second air inlet 102) of the compressor; wherein the D pipe of the first four-way valve 2 is connected with the first exhaust port 104 of the compressor, the C pipe is connected with the inlet of the outdoor heat exchanger 4, and the S pipe is connected with the first air suction port 101 of the compressor; the D pipe of the second four-way valve 3 is connected with the air outlet of the oil separator, wherein the second air outlet 103 of the compressor is connected with the oil separator 14, the C pipe is converged with the C pipe of the first four-way reversing valve and then enters the inlet end of the external heat exchanger, the E pipe of the second four-way reversing valve is connected with one end of the second indoor heat exchanger 9, and the other second air suction port 102 of the S pipe compressor of the second four-way reversing valve is connected; the outdoor heat exchanger 4 is connected to the first indoor heat exchanger 8 and the second indoor heat exchanger 9 via two electronic expansion valves (the first throttle device 6 and the second throttle device 7).
And when the refrigerating mode and the summer high-temperature environment dehumidification mode are operated, the D pipe and the C pipe of the first four-way reversing valve and the second four-way reversing valve are communicated, and the E pipe and the S pipe are communicated. At this time, the second and third two-way valves 11 and 12 are in a closed state, and the first and fourth two-way valves 10 and 13 are in a conductive state. The high-pressure gas compressed by the compressor passes through the D pipes of the two four-way valves (the first four-way valve 2 and the second four-way valve 3), is communicated with the C pipes of the two four-way reversing valves respectively and is converged to enter the inlet of the outdoor heat exchanger 4, the high-pressure gas is released and condensed into high-pressure refrigerant liquid in the outdoor condenser, the high-pressure refrigerant liquid is throttled by the electronic expansion valve (the first throttling device 6 and the second throttling device 7) respectively and then enters the two evaporators (the first indoor heat exchanger 8 and the second indoor heat exchanger 9) respectively, the throttled low-pressure two-phase refrigerant absorbs heat and gasifies in the two evaporators respectively, the gasified refrigerant gas is communicated with the E pipes of the first four-way reversing valve and the second four-way reversing valve respectively, the E pipes of the two four-way reversing valves are communicated with the S pipes respectively, and the refrigerant gas is respectively conveyed to the two air inlets a and b of the compressor for compression, and the whole refrigeration cycle is completed.
In the heating mode, the four-way reversing valves are in a second conduction state, namely the D pipe and the E pipe of the two four-way reversing valves are communicated, and the S pipe and the C pipe are communicated. At this time, the second and third two-way valves 11 and 12 are in a closed state, and the first and fourth two-way valves 10 and 13 are in a conductive state. The exhaust gas of the compressor is respectively connected to the first indoor heat exchanger 8 and the second indoor heat exchanger 9 through a D pipe and an E pipe of the four-way reversing valve, high-pressure refrigerant gas is subjected to heat release condensation in the first indoor heat exchanger 8 and the second indoor heat exchanger 9 to form high-pressure liquid, the high-pressure liquid is respectively throttled and mixed by an electronic expansion valve (a first throttling device 6 and a second throttling device 7) and then is sent to an outdoor heat exchanger, and the high-pressure refrigerant gas is respectively sent to two air inlets of the compressor through a C pipe and an S pipe of the first four-way reversing valve and the second four-way reversing valve after heat absorption and gasification in the outdoor heat exchanger, so that the whole refrigerant circulation flow is completed.
When the dehumidification mode is operated in a transition season of a damp-heat region, the D pipe and the C pipe of the first four-way reversing valve and the second four-way reversing valve are communicated, and the E pipe and the S pipe are communicated. At this time, the second and third two-way valves 11 and 12 are in the on state, and the first and fourth two-way valves 10 and 13 are in the off state. The high-pressure gas compressed by the compressor passes through the D pipes of the two four-way reversing valves (the first four-way valve 2 and the second four-way valve 3), is communicated with the C pipes of the two four-way reversing valves respectively, is converged and enters the inlet of the outdoor heat exchanger 4, is exothermically condensed into high-pressure refrigerant liquid in the outdoor condenser, at the moment, the electronic expansion valve (the first throttling device 6) is in a fully-opened state, the high-temperature refrigerant liquid firstly passes through the first throttling device 6 and then enters the first indoor heat exchanger 8 respectively, is further cooled in the first indoor heat exchanger 8 and then is throttled by the second throttling device 7 and then becomes low-pressure two-phase refrigerant to enter the second indoor heat exchanger 9 for heat absorption and gasification, the gasified refrigerant gas is respectively communicated with the E pipes of the first four-way reversing valve and the second four-way reversing valve, and the E pipes of the two four-way reversing valves are respectively communicated with the S pipes, and the refrigerant gas is respectively conveyed to the two air inlets a and b of the compressor for compression, so that the whole refrigeration cycle is completed.
The first throttling device 6 is a special electronic expansion valve which is conducted when fully opened and plays a role in throttling when regulated normally, and the second throttling device 7 can be a conventional throttling electronic expansion valve.
As shown in fig. 6, 7 and 8, in the alternative embodiment 1, the double suction double row compressor in the original main embodiment is replaced by a double suction single row compressor, that is, two compression cylinders of the compressor compress the gas sucked from two suction ports of the compressor respectively, and then mix the compressed gas with the gas in the compressor shell and then discharge the compressed gas through the same discharge port of the compressor, and the gas operation mode is the same as that of the main embodiment;
Fig. 9 and 10 are respectively a second and third embodiment of the present disclosure, mainly replacing the four-way two-way valve in the main embodiment with two three-way valves, wherein the first three-way valve 15 is in a-b conducting state when the cooling and heating modes are operated, the second three-way valve 16 is in f-d conducting state, the first three-way valve 15 is in c-b conducting state when the transition season dehumidifies the operation mode, and the second three-way valve 16 is in e-d conducting state.
The application has the technical effects that: through the improvement of the indoor heat exchanger connecting pipeline and the optimization of the operation control mode, the air supply reheating mode of the damp-heat area in the transition season dehumidification mode operation is increased, the air supply temperature is improved, the requirement of indoor environment comfort is met, and the efficient and comfortable operation in various operation modes is realized.
The invention is characterized in that:
1. two evaporators are arranged at the evaporator side, and the indoor return air is subjected to step cooling and dehumidification treatment, so that the running energy efficiency of the system is improved under the condition that the refrigerating capacity and the dehumidification capacity of the system are ensured;
2. when the dehumidification mode is operated in the transition season, the leeward side heat exchanger can be converted into the reheating heat exchanger by the control of the valve, so that the air supply temperature in the dehumidification mode is improved, the temperature of the refrigerant at the outlet of the condenser is reduced, the cold-out supercooling degree of the condenser is increased, the energy efficiency of the system is improved, and the indoor environment comfort is improved while the dehumidification effect is ensured;
3. through a reasonable control method, the function conversion of the heat exchanger in different operation modes is realized.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (7)
1. An air conditioning system, characterized in that: comprising the following steps:
a compressor (1), an outdoor heat exchanger (4), a first indoor heat exchanger (8) and a second indoor heat exchanger (9);
The first pipeline (106) where the first indoor heat exchanger (8) is located and the second pipeline (107) where the second indoor heat exchanger (9) is located are converged and then are communicated to the outdoor heat exchanger (4) through a third pipeline (108), a first throttling device (6) is arranged on the first pipeline (106), and a second throttling device (7) is arranged on the second pipeline (107);
The air conditioning system further comprises a first branch (109) and a second branch (110), wherein one end of the first branch (109) is communicated to the first pipeline (106) and is positioned between the first indoor heat exchanger (8) and the compressor (1), and the other end of the first branch (109) is communicated to the second pipeline (107) and is positioned between the junction of the second pipeline (107) and the first pipeline (106) and the second throttling device (7); one end of the second branch (110) is communicated to the first pipeline (106) and is positioned between the first indoor heat exchanger (8) and the compressor (1), and the other end of the second branch (110) is communicated to the second pipeline (107) and is positioned between the second indoor heat exchanger (9) and the compressor (1);
The first indoor heat exchanger (8) and the second indoor heat exchanger (9) are arranged side by side, and air flow can sequentially flow through the second indoor heat exchanger (9) and the first indoor heat exchanger (8) to complete heat exchange;
The first branch (109) is provided with a third two-way valve (12), the second branch (110) is provided with a second two-way valve (11), a fourth two-way valve (13) is arranged on the second pipeline (107) and positioned between the junction with the first pipeline (106) and the junction with the first branch (109), and a first two-way valve (10) is also arranged on the first pipeline (106) and positioned between the junction with the first branch (109) and the junction with the second branch (110); or a first three-way valve (15) is arranged at the junction of the first branch (109) and the second pipeline (107), and a second three-way valve (16) is arranged at the junction of the second branch (110) and the first pipeline (106);
a detection step for detecting an operation mode of the air conditioning system;
Judging, namely judging which of the plurality of modes the operation mode of the current air conditioner belongs to, wherein the operation mode comprises a refrigeration mode, a summer high-temperature environment dehumidification mode, a heating mode and a wet and hot region transition season operation dehumidification mode;
a control step, when the air conditioning system operates in a dehumidification mode in a transition season of a damp-heat region:
When the first, second, third and fourth two-way valves are included, the first two-way valve (10), the second two-way valve (11), the third two-way valve (12) and the fourth two-way valve (13) are controlled to be closed, the opening of the first throttling device (6) is controlled to be adjusted to the maximum opening, and the second throttling device (7) is controlled to be normally throttled;
when the three-way valve comprises a first three-way valve and a second three-way valve, the first three-way valve (15) is controlled to enable the first branch (109) to be conducted, a joint of the second pipeline (107) and the first pipeline (106) is disconnected from a pipe section between the first three-way valve (15), the second three-way valve (16) is controlled to enable the second branch (110) to be conducted, a joint of the first pipeline (106) and the first branch (109) is disconnected from a pipe section between the first pipeline (106) and the second branch (110), and meanwhile, the opening of the first throttling device (6) is controlled to be adjusted to be the maximum opening, and the second throttling device (7) is normally throttled;
The control step is further used for when the air conditioning system is operated in a summer high-temperature environment dehumidification mode:
When the first, second, third and fourth two-way valves are included, the first two-way valve (10), the second two-way valve (11), the third two-way valve (12) and the fourth two-way valve (13) are controlled to be opened, and the first throttling device (6) is controlled to normally throttle, and the second throttling device (7) is controlled to normally throttle;
When the first three-way valve and the second three-way valve are included, the first three-way valve (15) is controlled to disconnect the first branch (109), a pipe section between the junction of the second pipeline (107) and the first pipeline (106) and the first three-way valve (15) is connected, the second three-way valve (16) is controlled to disconnect the second branch (110), a pipe section between the junction of the first pipeline (106) and the first branch (109) and the junction of the first pipeline (106) and the second branch (110) is connected, and meanwhile, the first throttling device (6) is controlled to normally throttle, and the second throttling device (7) is controlled to normally throttle;
The compressor (1) comprises a first cylinder and a second cylinder;
The first cylinder has a first intake port (101) and a first exhaust port (104), and the second cylinder has a second intake port (102) and a second exhaust port (103): the outdoor heat exchanger (4) can be simultaneously communicated to the first exhaust port (104) and the second exhaust port (103), the first indoor heat exchanger (8) can be communicated to the first air suction port (101), and the second indoor heat exchanger (9) can be communicated to the second air suction port (102); or the outdoor heat exchanger (4) can be simultaneously communicated with the first air suction port (101) and the second air suction port (102), the first indoor heat exchanger (8) can be communicated with the first air exhaust port (104), and the second indoor heat exchanger (9) can be communicated with the second air exhaust port (103);
Or the first cylinder is provided with a first air suction port (101), the second cylinder is provided with a second air suction port (102), and the air discharged by the first cylinder and the air discharged by the second cylinder are mixed in the shell of the compressor and then discharged through a third air discharge port (105): the outdoor heat exchanger (4) can be communicated with the third exhaust port (105), the first indoor heat exchanger (8) can be communicated with the first air suction port (101), and the second indoor heat exchanger (9) can be communicated with the second air suction port (102); or the outdoor heat exchanger (4) can be simultaneously communicated with the first air suction port (101) and the second air suction port (102), the first indoor heat exchanger (8) can be communicated with the third air exhaust port (105), and the second indoor heat exchanger (9) can also be communicated with the third air exhaust port (105).
2. An air conditioning system according to claim 1, wherein:
the valve also comprises a first four-way valve (2) and a second four-way valve (3):
Four ports of the first four-way valve (2) are respectively communicated with the first air suction port, the first air exhaust port, the outdoor heat exchanger (4) and the first indoor heat exchanger (8), and four ports of the second four-way valve (3) are respectively communicated with the second air suction port, the second air exhaust port, the outdoor heat exchanger (4) and the second indoor heat exchanger (9);
Or when the third exhaust port is included, four ports of the first four-way valve (2) are respectively communicated with the first air suction port, the third exhaust port, the outdoor heat exchanger (4) and the first indoor heat exchanger (8), and four ports of the second four-way valve (3) are respectively communicated with the second air suction port, the third exhaust port, the outdoor heat exchanger (4) and the second indoor heat exchanger (9).
3. An air conditioning system according to claim 1, wherein:
When the air conditioning system comprises a second exhaust port, the air conditioning system further comprises an oil return device, wherein the oil return device is arranged at the second exhaust port (103) and can return oil in gas exhausted by the second exhaust port to the bottom of an inner cavity of the compressor (1);
The oil return device comprises an oil separator (14) and an oil return assembly, the second exhaust port is communicated with the oil separator (14) through an exhaust pipeline, the bottom of the oil separator (14) is communicated to the bottom of an inner cavity of the compressor (1) through an oil return pipeline, and the oil return assembly comprises a first oil return control valve arranged on the oil return pipeline; or alternatively
The oil return device comprises an oil separator (14) and an oil return assembly, the second exhaust port is communicated with the oil separator (14) through an exhaust pipeline, the bottom of the oil separator (14) is communicated to the bottom of an inner cavity of the compressor (1) through an oil return pipeline, the oil return assembly comprises a second oil return control valve arranged on the oil return pipeline and a parallel pipeline connected with the second oil return control valve in parallel, and an oil return capillary tube is arranged on the parallel pipeline.
4. An air conditioning system according to any of claims 1-3, characterized in that:
The first throttling device (6) is a fully-opened and conducted electronic expansion valve; and/or the second throttling device (7) is a full-open throttling electronic expansion valve.
5. A control method applicable to the air conditioning system according to any one of claims 1 to 4, characterized in that: comprising the following steps:
a detection step for detecting an operation mode of the air conditioning system;
Judging, namely judging which of the plurality of modes the operation mode of the current air conditioner belongs to, wherein the operation mode comprises a refrigeration mode, a summer high-temperature environment dehumidification mode, a heating mode and a wet and hot region transition season operation dehumidification mode;
a control step, when the air conditioning system operates in a dehumidification mode in a transition season of a damp-heat region:
When the first, second, third and fourth two-way valves are included, the first two-way valve (10), the second two-way valve (11), the third two-way valve (12) and the fourth two-way valve (13) are controlled to be closed, the opening of the first throttling device (6) is controlled to be adjusted to the maximum opening, and the second throttling device (7) is controlled to be normally throttled;
when the three-way valve comprises a first three-way valve and a second three-way valve, the first three-way valve (15) is controlled to enable the first branch (109) to be conducted, a joint of the second pipeline (107) and the first pipeline (106) is disconnected from a pipe section between the first three-way valve (15), the second three-way valve (16) is controlled to enable the second branch (110) to be conducted, a joint of the first pipeline (106) and the first branch (109) is disconnected from a pipe section between the first pipeline (106) and the second branch (110), and meanwhile, the opening of the first throttling device (6) is controlled to be adjusted to be the maximum opening, and the second throttling device (7) is normally throttled;
The control step is further used for when the air conditioning system is operated in a summer high-temperature environment dehumidification mode:
When the first, second, third and fourth two-way valves are included, the first two-way valve (10), the second two-way valve (11), the third two-way valve (12) and the fourth two-way valve (13) are controlled to be opened, and the first throttling device (6) is controlled to normally throttle, and the second throttling device (7) is controlled to normally throttle;
When the three-way valve is included, the first three-way valve (15) is controlled to enable the first branch (109) to be disconnected, the junction of the second pipeline (107) and the first pipeline (106) is connected with a pipe section between the first three-way valve (15), the second three-way valve (16) is controlled to enable the second branch (110) to be disconnected, the junction of the first pipeline (106) and the first branch (109) is controlled to enable the pipe section between the junction of the first pipeline (106) and the second branch (110) to be connected, and meanwhile the first throttling device (6) is controlled to be normally throttled, and the second throttling device (7) is controlled to be normally throttled.
6. The control method according to claim 5, characterized in that:
the control step is further configured to, when the air conditioning system is operating in a cooling mode:
When the first, second, third and fourth two-way valves are included, the first two-way valve (10), the second two-way valve (11), the third two-way valve (12) and the fourth two-way valve (13) are controlled to be opened, and the first throttling device (6) is controlled to normally throttle, and the second throttling device (7) is controlled to normally throttle;
When the three-way valve is included, the first three-way valve (15) is controlled to enable the first branch (109) to be disconnected, the junction of the second pipeline (107) and the first pipeline (106) is connected with a pipe section between the first three-way valve (15), the second three-way valve (16) is controlled to enable the second branch (110) to be disconnected, the junction of the first pipeline (106) and the first branch (109) is controlled to enable the pipe section between the junction of the first pipeline (106) and the second branch (110) to be connected, and meanwhile the first throttling device (6) is controlled to be normally throttled, and the second throttling device (7) is controlled to be normally throttled.
7. The control method according to claim 5, characterized in that:
the control step is further configured to, when the air conditioning system is operating in the heating mode:
When the first, second, third and fourth two-way valves are included, the first two-way valve (10), the second two-way valve (11), the third two-way valve (12) and the fourth two-way valve (13) are controlled to be opened, and the first throttling device (6) is controlled to normally throttle, and the second throttling device (7) is controlled to normally throttle;
When the three-way valve is included, the first three-way valve (15) is controlled to enable the first branch (109) to be disconnected, the junction of the second pipeline (107) and the first pipeline (106) is connected with a pipe section between the first three-way valve (15), the second three-way valve (16) is controlled to enable the second branch (110) to be disconnected, the junction of the first pipeline (106) and the first branch (109) is controlled to enable the pipe section between the junction of the first pipeline (106) and the second branch (110) to be connected, and meanwhile the first throttling device (6) is controlled to be normally throttled, and the second throttling device (7) is controlled to be normally throttled.
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| CN112229003B (en) * | 2020-10-26 | 2024-03-26 | 珠海格力电器股份有限公司 | Air conditioning system and control method thereof |
| CN112229002B (en) * | 2020-10-26 | 2022-05-10 | 珠海格力电器股份有限公司 | Air conditioning system and control method thereof |
| CN113847749A (en) * | 2021-09-16 | 2021-12-28 | 珠海格力电器股份有限公司 | Control device and method of air conditioning system and air conditioning system |
| CN113834188A (en) * | 2021-09-16 | 2021-12-24 | 珠海格力电器股份有限公司 | Control device and method of air conditioning system and air conditioning system |
| CN117232170A (en) * | 2023-11-16 | 2023-12-15 | 珠海格力电器股份有限公司 | Heat pump air conditioning system, control method and device thereof and air conditioner |
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| JP2013204937A (en) * | 2012-03-28 | 2013-10-07 | Fujitsu General Ltd | Air conditioner |
| CN111306833A (en) * | 2020-02-27 | 2020-06-19 | 珠海格力电器股份有限公司 | Double-temperature air conditioning system |
| CN212253006U (en) * | 2020-07-02 | 2020-12-29 | 珠海格力电器股份有限公司 | Air conditioning system |
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| CN105333638B (en) * | 2014-05-26 | 2018-09-21 | 大金工业株式会社 | Air-conditioning device and its control method |
| CN105352042B (en) * | 2015-11-27 | 2019-03-12 | 深圳创维空调科技有限公司 | Air conditioner indoor unit and air conditioner |
| CN205227549U (en) * | 2015-12-22 | 2016-05-11 | 珠海格力电器股份有限公司 | Air conditioning system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013204937A (en) * | 2012-03-28 | 2013-10-07 | Fujitsu General Ltd | Air conditioner |
| CN111306833A (en) * | 2020-02-27 | 2020-06-19 | 珠海格力电器股份有限公司 | Double-temperature air conditioning system |
| CN212253006U (en) * | 2020-07-02 | 2020-12-29 | 珠海格力电器股份有限公司 | Air conditioning system |
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