CN111609589A - Double-temperature air conditioning system, control method and air conditioner - Google Patents
Double-temperature air conditioning system, control method and air conditioner Download PDFInfo
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- CN111609589A CN111609589A CN202010331312.6A CN202010331312A CN111609589A CN 111609589 A CN111609589 A CN 111609589A CN 202010331312 A CN202010331312 A CN 202010331312A CN 111609589 A CN111609589 A CN 111609589A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005057 refrigeration Methods 0.000 claims description 110
- 238000010438 heat treatment Methods 0.000 claims description 108
- 230000009977 dual effect Effects 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract description 7
- 238000010168 coupling process Methods 0.000 abstract description 7
- 238000005859 coupling reaction Methods 0.000 abstract description 7
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009467 reduction 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
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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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
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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
- 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
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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
- 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
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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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
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
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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
- F25B31/00—Compressor arrangements
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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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application provides a dual-temperature air conditioning system, a control method and an air conditioner. This two temperature air conditioning system includes: the heat exchanger comprises a compressor, an outdoor heat exchanger, a first indoor heat exchanger and a second indoor heat exchanger; a first pipeline communicated with the first indoor heat exchanger and a second pipeline communicated with the second indoor heat exchanger are converged and then communicated to the outdoor heat exchanger through a third pipeline, a first throttling device is arranged on the third pipeline, and a second throttling device is arranged on the second pipeline; the opening degree of the first throttling device can be adjusted, the opening degree of the second throttling device is fixed, and the opening degree of the first throttling device can be controlled and adjusted according to the temperature of the first indoor heat exchanger or the second indoor heat exchanger. According to the method and the device, the two throttling devices in the dual-temperature air-conditioning system can be stably controlled, the situation that opening degrees between the two throttling devices are mutually influenced and cannot be stably controlled due to coupling in actual control is prevented, and the dual-temperature air-conditioning system is guaranteed to stably, reliably and efficiently run.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to a dual-temperature air conditioning system, a control method and an air conditioner.
Background
The existing air conditioning system usually adopts a single-suction single-row compressor, and a refrigeration cycle loop is formed by the single-row compressor and single-row or multi-row heat exchangers indoors and outdoors, so that indoor air is heated or cooled, and the requirement of indoor environment comfort is met. The air conditioning system can only realize one evaporation temperature and one condensation temperature because the compressor is only connected with the indoor heat exchanger and the outdoor heat exchanger through the suction port and the exhaust port. In order to realize step heating or cooling of indoor air, patent application No. CN105444453A proposes a dual-temperature air conditioning system with two parallel-connected cylinders to improve system energy efficiency and slow down the attenuation speed of energy efficiency under the working condition of low-temperature heating and frosting. The double-temperature air conditioning system is provided with two throttling devices, and the control of the two throttling devices plays an important role in the performance of the system.
Because the dual-temperature air conditioning system in the prior art needs two throttling devices, the two throttling devices belong to a parallel relation, and the opening degrees of the two throttling devices are mutually influenced, the technical problems of mutual coupling, difficulty in stable control and the like exist in the actual system control, and therefore the dual-temperature air conditioning system, the control method and the air conditioner are researched and designed.
Disclosure of Invention
Therefore, the technical problem to be solved by the present application is to overcome the defect that the two throttling devices in the dual-temperature air conditioning system in the prior art cannot realize stable control, so that the system cannot operate stably, reliably and efficiently, thereby providing a dual-temperature air conditioning system, a control method and an air conditioner.
In order to solve the above problems, the present application provides a dual temperature air conditioning system, comprising:
the compressor comprises a first cylinder and a second cylinder, the first cylinder is provided with a first air suction port and a first exhaust port, and the second cylinder is provided with a second air suction port and a second exhaust port; the outdoor heat exchanger can be communicated to the first exhaust port and the second exhaust port at the same time, 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 communicated to the first air suction port and the second air suction port at the same time, the first indoor heat exchanger can be communicated to the first exhaust port, and the second indoor heat exchanger can be communicated to the second 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 gas discharged by the first cylinder and the gas 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 to the third 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 communicated to the first air suction port and the second air suction port at the same time, the first indoor heat exchanger can be communicated to the third air exhaust port, and the second indoor heat exchanger can also be communicated to the third air exhaust port;
a first pipeline communicated with the first indoor heat exchanger and a second pipeline communicated with the second indoor heat exchanger are converged and then communicated to the outdoor heat exchanger through a third pipeline, a first throttling device is arranged on the third pipeline, and a second throttling device is arranged on the second pipeline;
the opening degree of the first throttling device can be adjusted, the opening degree of the second throttling device is fixed, and the opening degree of the first throttling device can be controlled and adjusted according to the temperature of the first indoor heat exchanger or the second indoor heat exchanger.
Preferably, during the refrigeration operation, the outdoor heat exchanger is communicated to the first exhaust port and the second exhaust port at the same time, the first indoor heat exchanger is communicated to the first air suction port, and the second indoor heat exchanger is communicated to the second air suction port; presetting first indoor heat exchanger temperature for refrigeration, presetting second indoor heat exchanger temperature for refrigeration the aperture of first throttling device can be adjusted according to the refrigeration first difference between the temperature of the first indoor heat exchanger and the refrigeration preset first indoor heat exchanger temperature and the larger absolute value between the temperature of the second indoor heat exchanger and the refrigeration second difference between the refrigeration preset second indoor heat exchanger temperature, wherein the refrigeration first difference is (first indoor heat exchanger temperature-refrigeration preset first indoor heat exchanger temperature), and the refrigeration second difference is (second indoor heat exchanger temperature-refrigeration preset second indoor heat exchanger temperature).
Preferably, during heating operation, the outdoor heat exchanger is communicated to the first air suction port and the second air suction port at the same time, the first indoor heat exchanger is communicated to the first exhaust port, and the second indoor heat exchanger is communicated to the second exhaust port; presetting first indoor heat exchanger temperature for heating, presetting second indoor heat exchanger temperature for heating, the aperture of the first throttling device can be adjusted according to a first heating difference value of the first indoor heat exchanger temperature and the preset first indoor heat exchanger temperature for heating and a larger absolute value between a second indoor heat exchanger temperature and a second heating difference value of the preset second indoor heat exchanger temperature for heating, wherein the first heating difference value is (the first indoor heat exchanger temperature-the preset first indoor heat exchanger temperature for heating), and the second heating difference value is (the second indoor heat exchanger temperature-the preset second indoor heat exchanger temperature for heating).
Preferably, when the compressor includes a first exhaust port and a second exhaust port, the dual-temperature air conditioning system further includes a first four-way valve and a second four-way valve, four ports of the first four-way valve are respectively communicated to 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 to the second air suction port, the second exhaust port, the outdoor heat exchanger and the second indoor heat exchanger; or when the compressor comprises a third exhaust port, the dual-temperature air conditioning system further comprises a first four-way valve and a second four-way valve, four ports of the first four-way valve are respectively communicated to the first air suction port, the third exhaust port, the outdoor heat exchanger and the first indoor heat exchanger, and four ports of the second four-way valve are respectively communicated to the second air suction port, the third exhaust port, the outdoor heat exchanger and the second indoor heat exchanger.
Preferably, the compressor further comprises an oil return device, wherein the oil return device is arranged at the second air outlet and can return oil in the air discharged by the second air outlet to the bottom of the inner cavity of the compressor;
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,
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 indoor heat exchanger comprises an indoor fan, the first indoor heat exchanger and the second indoor heat exchanger are arranged side by side, and the indoor fan is arranged on one side of the second indoor heat exchanger, so that airflow sequentially flows through the first indoor heat exchanger, the second indoor heat exchanger and the indoor fan.
According to another aspect of the present application, there is provided a control method for the dual temperature air conditioning system, including:
a detection step for detecting the temperature of the first indoor heat exchanger, the temperature of the second indoor heat exchanger, the frequency of a compressor, and the temperature and humidity of an indoor environment;
a calculating step, namely calculating to obtain a preset first indoor heat exchanger temperature according to the detected indoor environment temperature and humidity and the compressor frequency, and determining a first difference value according to the detected first indoor heat exchanger temperature and the calculated preset first indoor heat exchanger temperature; or calculating to obtain a preset second indoor heat exchanger temperature according to the detected indoor environment temperature and humidity and the compressor frequency, and determining a second difference value according to the detected temperature of the second indoor heat exchanger and the calculated preset second indoor heat exchanger temperature, wherein the first difference value is (the first indoor heat exchanger temperature-the preset first indoor heat exchanger temperature), and the second difference value is (the second indoor heat exchanger temperature-the preset second indoor heat exchanger temperature);
and a control step of controlling and adjusting the opening degree of the first throttling device (41) according to the first difference or the second difference.
Preferably, when the refrigerator is operated, in the calculating step: the refrigeration preset first indoor heat exchanger temperature is determined according to the detected indoor environment temperature and humidity; the control step comprises: adjusting the opening degree of the first throttling device according to the larger absolute value between a refrigeration first difference value between the temperature of the first indoor heat exchanger and the refrigeration preset first indoor heat exchanger and a refrigeration second difference value between the temperature of the second indoor heat exchanger and the refrigeration preset second indoor heat exchanger, wherein the refrigeration first difference value is equal to (the temperature of the first indoor heat exchanger-the temperature of the refrigeration preset first indoor heat exchanger), and the refrigeration second difference value is equal to (the temperature of the second indoor heat exchanger-the temperature of the refrigeration preset second indoor heat exchanger);
when heating operation is performed, the calculating step comprises: the heating preset first indoor heat exchanger temperature is determined according to the detected indoor environment temperature and the compressor frequency; the control step comprises: the opening size of the first throttling device is adjusted according to the fact that the absolute value between the first heating difference value of the first indoor heat exchanger temperature and the preset heating first indoor heat exchanger temperature and the absolute value between the second indoor heat exchanger temperature and the preset heating second difference value of the second indoor heat exchanger temperature are larger, wherein the first heating difference value is equal to (the first indoor heat exchanger temperature-the preset heating first indoor heat exchanger temperature), and the second heating difference value is equal to (the second indoor heat exchanger temperature-the preset heating second indoor heat exchanger temperature).
Preferably, during the refrigeration operation, if the absolute value of the first refrigeration difference is large, when the first refrigeration difference between the temperature of the first indoor heat exchanger and the temperature of the refrigeration preset first indoor heat exchanger is greater than 0, the opening degree of the first throttling device is controlled to be reduced; when a first refrigeration difference value between the temperature of the first indoor heat exchanger and the temperature of a refrigeration preset first indoor heat exchanger is smaller than 0, controlling the opening degree of the first throttling device to increase; when a first refrigeration difference value between the temperature of the first indoor heat exchanger and the temperature of a refrigeration preset first indoor heat exchanger is equal to 0, controlling the opening degree of the first throttling device to be unchanged;
when the air conditioner works in a heating mode, if the absolute value of the first heating difference value is larger, when the first heating difference value between the temperature of the first indoor heat exchanger and the temperature of a preset first indoor heat exchanger for heating is larger than 0, the opening degree of the first throttling device is controlled to be reduced; when a first heating difference value between the temperature of the first indoor heat exchanger and a preset first indoor heat exchanger for heating is smaller than 0, controlling the opening degree of the first throttling device to increase; and when a first heating difference value between the temperature of the first indoor heat exchanger and the temperature of a preset first indoor heat exchanger for heating is equal to 0, controlling the opening degree of the first throttling device to be unchanged.
According to another aspect of the present application, there is provided an air conditioner including the above-described dual temperature air conditioning system.
The application provides a two temperature air conditioning system, control method and air conditioner have following beneficial effect:
the air conditioner comprises a compressor provided with at least two independent cylinders, a first indoor heat exchanger communicated with the first cylinder, a second indoor heat exchanger communicated with the second cylinder, a first throttling device arranged on a first pipeline between an outdoor heat exchanger and the first indoor heat exchanger, and a second throttling device arranged on a second pipeline between the outdoor heat exchanger and the second indoor heat exchanger, wherein the difference value between the temperature of the indoor heat exchanger and the preset temperature is used as a main factor for controlling the opening of the first throttling device, so that the opening of the first throttling device is adjustable, the opening of the second throttling device is fixed, the coupling of the first throttling device and the second throttling device in the air conditioning control process is effectively removed, the stable control of the two throttling devices in a dual-temperature air conditioning system can be effectively realized, and the mutual influence of the openings between the two throttling devices in the actual system control is prevented, The condition that the stable control cannot be realized due to the coupling exists, and the stable, reliable and efficient operation of the dual-temperature air conditioning system is ensured.
Drawings
FIG. 1 is a system diagram of a first embodiment of a dual temperature air conditioning system of the present application;
FIG. 2 is a system diagram of a second embodiment of a dual temperature air conditioning system of the present application;
FIG. 3 is a block diagram of a dual suction, dual discharge compressor in the dual temperature air conditioning system of the present application;
fig. 4 is a system diagram of a third embodiment of a dual-temperature air conditioning system according to the present application.
The reference numerals are represented as:
1. a compressor; 21. a first four-way valve; 22. a second four-way valve; 3. an outdoor heat exchanger; 41. a first throttling device; 42. a second throttling device; 51. a first indoor heat exchanger; 52. a second indoor heat exchanger; 6. an oil separator; 7. a first oil return control valve; 8. an indoor fan; 9. an outdoor fan; 10. a second return oil control valve; 11. an oil return capillary tube; 12. a first pipeline; 13. a second pipeline; 14. a third pipeline; 101. a first air intake port; 102. a second air suction port; 103. a first exhaust port; 104. a second exhaust port; 105. an oil return port; 106. a third exhaust port.
Detailed Description
As shown in fig. 1-4, the present application provides a dual temperature air conditioning system, comprising:
a compressor 1, an outdoor heat exchanger 3, a first indoor heat exchanger 51 and a second indoor heat exchanger 52, the compressor 1 comprising a first cylinder having a first suction port 101 and a first discharge port 103 and a second cylinder having a second suction port 102 and a second discharge port 104; the outdoor heat exchanger 3 may be communicated to the first exhaust port 103 and the second exhaust port 104 at the same time, the first indoor heat exchanger 51 may be communicated to the first suction port 101, and the second indoor heat exchanger 52 may be communicated to the second suction port 102; alternatively, the outdoor heat exchanger 3 may be communicated to the first suction port 101 and the second suction port 102 at the same time, the first indoor heat exchanger 51 may be communicated to the first exhaust port 103, and the second indoor heat exchanger 52 may be communicated to the second exhaust port 104;
or, the first cylinder has a first air intake 101, the second cylinder has a second air intake 102, and the gas discharged from the first cylinder and the gas discharged from the second cylinder are mixed in the interior of the compressor casing and then discharged through a third air discharge 106: the outdoor heat exchanger 3 may be communicated to the third discharge port 106, the first indoor heat exchanger 51 may be communicated to the first suction port 101, and the second indoor heat exchanger 52 may be communicated to the second suction port 102; alternatively, the outdoor heat exchanger 3 may be communicated to the first suction port 101 and the second suction port 102 at the same time, the first indoor heat exchanger 51 may be communicated to the third discharge port 106, and the second indoor heat exchanger 52 may also be communicated to the third discharge port 106;
a first pipeline 12 communicated with the first indoor heat exchanger 51 and a second pipeline 13 communicated with the second indoor heat exchanger 52 are merged and then communicated to the outdoor heat exchanger 3 through a third pipeline 14, a first throttling device 41 is arranged on the third pipeline 14 (embodiment 1), and a second throttling device 42 is arranged on the second pipeline 13;
the opening degree of the first throttle device 41 can be adjusted, the opening degree of the second throttle device 42 is fixed, and the opening degree of the first throttle device 41 can be controlled and adjusted according to the temperature of the first indoor heat exchanger 51 or the second indoor heat exchanger 52.
The air conditioner comprises a compressor provided with at least two independent cylinders, a first indoor heat exchanger communicated with the first cylinder, a second indoor heat exchanger communicated with the second cylinder, a first throttling device arranged on a first pipeline between an outdoor heat exchanger and the first indoor heat exchanger, and a second throttling device arranged on a second pipeline between the outdoor heat exchanger and the second indoor heat exchanger, wherein the difference value between the temperature of the indoor heat exchanger and the preset temperature is used as a main factor for controlling the opening of the first throttling device, so that the opening of the first throttling device is adjustable, the opening of the second throttling device is fixed, the coupling of the first throttling device and the second throttling device in the air conditioning control process is effectively removed, the stable control of the two throttling devices in a dual-temperature air conditioning system can be effectively realized, and the mutual influence of the openings between the two throttling devices in the actual system control is prevented, The condition that the stable control cannot be realized due to the coupling exists, and the stable, reliable and efficient operation of the dual-temperature air conditioning system is ensured.
Preferably, when cooling operation is performed, the outdoor heat exchanger 3 is communicated to the first exhaust port and the second exhaust port at the same time, the first indoor heat exchanger 51 is communicated to the first suction port, and the second indoor heat exchanger 52 is communicated to the second suction port; presetting the temperature of the first indoor heat exchanger as the temperature of a refrigeration preset first indoor heat exchanger, presetting the temperature of the second indoor heat exchanger as the temperature of a refrigeration preset second indoor heat exchanger, the refrigeration preset first indoor heat exchanger temperature and the refrigeration preset second indoor heat exchanger temperature are determined according to the indoor temperature and the humidity, the opening degree of the first throttling device 41 can be adjusted according to a refrigeration first difference value between the temperature of the first indoor heat exchanger and the refrigeration preset first indoor heat exchanger and a larger absolute value between the temperature of the second indoor heat exchanger 52 and the refrigeration second difference value between the temperature of the refrigeration preset second indoor heat exchanger, wherein the refrigeration first difference value is (the temperature of the first indoor heat exchanger-the refrigeration preset first indoor heat exchanger), and the refrigeration second difference value is (the temperature of the second indoor heat exchanger-the refrigeration preset second indoor heat exchanger).
The dual-temperature air conditioning system is in an optimal structure form under the refrigeration operation working condition, namely, a first exhaust port of a first compressor is communicated with an outdoor heat exchanger, a first indoor heat exchanger is communicated with a first air suction port of the first compressor, a second exhaust port of a second compressor is communicated with the outdoor heat exchanger, a second indoor heat exchanger is communicated with a second air suction port of the second compressor, as the first indoor heat exchanger is communicated with a first air suction port of a first cylinder, the temperature of the first preset refrigeration indoor heat exchanger is determined according to the indoor temperature and the humidity, the temperature of the second preset refrigeration indoor heat exchanger is determined according to the indoor temperature and the humidity, the opening degree of a first throttling device is controlled and adjusted through the larger absolute value between the obtained first difference value of the temperature of the first indoor heat exchanger and the temperature of the first preset refrigeration indoor heat exchanger and the absolute value between the temperature of the second indoor heat exchanger 52 and the second difference value of the temperature of the second preset refrigeration indoor heat exchanger, the optimal opening degree of the first throttling device 41 under the refrigeration working condition is obtained, stable control over the two throttling devices is achieved, influence or interference between the two throttling devices is avoided, and the stable, reliable and efficient operation of the dual-temperature air conditioning system is guaranteed.
Preferably, in heating operation, the outdoor heat exchanger 3 is communicated to the first suction port and the second suction port at the same time, the first indoor heat exchanger 51 is communicated to the first exhaust port, and the second indoor heat exchanger 52 is communicated to the second exhaust port; presetting the temperature of the first indoor heat exchanger as the heating preset first indoor heat exchanger temperature, presetting the temperature of the second indoor heat exchanger as the refrigerating preset second indoor heat exchanger temperature, the heating preset first indoor heat exchanger temperature and the preset second indoor heat exchanger temperature are determined according to the indoor temperature and the compressor frequency, the opening degree of the first throttling device 41 can be adjusted according to a first heating difference value between the first indoor heat exchanger temperature and the preset first indoor heat exchanger temperature for heating and a second heating difference value between the second indoor heat exchanger temperature and the preset second indoor heat exchanger temperature for heating, wherein the first heating difference value is equal to (the first indoor heat exchanger temperature-the preset first indoor heat exchanger temperature for heating), and the second heating difference value is equal to (the second indoor heat exchanger temperature-the preset second indoor heat exchanger temperature for heating).
The dual-temperature air conditioning system is in an optimal structural form under the heating operation working condition, namely a first exhaust port of a first compressor is communicated with a first indoor heat exchanger, an outdoor heat exchanger is communicated to a first air suction port of the first compressor, a second exhaust port of a second compressor is communicated with a second indoor heat exchanger, and the outdoor heat exchanger is communicated to a second air suction port of the second compressor And controlling and adjusting to obtain the optimal opening size of the first throttling device under the heating working condition, realizing the stable control of the two throttling devices, avoiding the influence or interference between the two throttling devices and ensuring the stable, reliable and efficient operation of the dual-temperature air conditioning system.
Preferably, when the compressor includes a first exhaust port and a second exhaust port, the dual temperature air conditioning system further includes a first four-way valve 21 and a second four-way valve 22, four ports of the first four-way valve 21 are respectively communicated to the first suction port, the first exhaust port, the outdoor heat exchanger 3 and the first indoor heat exchanger 51, and four ports of the second four-way valve 22 are respectively communicated to the second suction port, the second exhaust port, the outdoor heat exchanger 3 and the second indoor heat exchanger 52; or, when the compressor includes a third exhaust port, the dual temperature air conditioning system further includes a first four-way valve 21 and a second four-way valve 22, four ports of the first four-way valve 21 are respectively communicated to the first intake port, the third exhaust port, the outdoor heat exchanger 3 and the first indoor heat exchanger 51, and four ports of the second four-way valve 22 are respectively communicated to the second intake port, the third exhaust port, the outdoor heat exchanger 3 and the second indoor heat exchanger 52. The first four-way valve is used for realizing effective switching of the first indoor heat exchanger as a refrigerating condition and a heating condition, and the second four-way valve is used for realizing effective switching of the second indoor heat exchanger as a refrigerating condition and a heating condition.
Preferably, the dual-temperature air conditioning system further comprises an oil return device, wherein the oil return device is arranged at the second air outlet and can enable oil in the gas exhausted by the second air outlet to flow back to the bottom of the inner cavity of the compressor 1.
As shown in fig. 1, the oil return device includes an oil separator 6 and an oil return assembly, the second exhaust port is communicated with the oil separator 6 through an exhaust pipeline, the bottom of the oil separator 6 is communicated to the bottom of the inner cavity of the compressor 1 through an oil return pipeline, and the oil return assembly includes a first oil return control valve 7 disposed on the oil return pipeline. This is a preferable configuration of the oil return device according to embodiment 1 of the present application, and the opening and closing of the oil return passage can be effectively controlled by the arrangement of the first oil return control valve and the oil return line, and an effective oil return function can be performed when oil return is required.
In another embodiment, as shown in fig. 2, the oil return device includes an oil separator 6 and an oil return assembly, the second exhaust port communicates with the oil separator 6 through an exhaust line, the bottom of the oil separator 6 communicates with the bottom of the inner cavity of the compressor 1 through an oil return line, the oil return assembly includes a second oil return control valve 10 disposed on the oil return line, and a parallel line connected in parallel with the second oil return control valve, and an oil return capillary 11 is disposed on the parallel line. This is the preferred structural style of the oil return device of embodiment 2 of this application, can effectively control opening and closing of oil return route through the setting of second oil return control valve and oil return pipeline, can carry out effective oil return effect (large-traffic) when needing to carry out the oil return, can also carry out the oil return effect (little flow) that has the throttle degree through oil return capillary 11 when second oil return control valve closes, can effectively guarantee that the oil return process lasts effectual going on.
Preferably, the dual temperature air conditioning system further includes an indoor fan 8, the first indoor heat exchanger 51 and the second indoor heat exchanger 52 are arranged side by side, and the indoor fan 8 is arranged at one side of the second indoor heat exchanger 52, so that an air flow passes through the first indoor heat exchanger 51, the second indoor heat exchanger 52 and the indoor fan 8 in sequence. This is the further preferred structural style of air conditioning system of this application, unites two indoor heat exchangers, carries out the heat transfer effect to two indoor heat exchangers through an indoor fan, has realized the effective integration of heat exchanger, compact structure, and can realize the refrigerated effect of air current step, has reduced the heat transfer difference in temperature, improves system's energy efficiency level.
The present application further provides a control method for a dual temperature air conditioning system as set forth in any of the preceding claims, comprising:
a detection step for detecting the temperature of the first indoor heat exchanger, the temperature of the second indoor heat exchanger, the frequency of a compressor, and the temperature and humidity of an indoor environment;
a calculating step, namely calculating to obtain a preset first indoor heat exchanger temperature according to the detected indoor environment temperature and humidity and the compressor frequency, and determining a first difference value according to the detected first indoor heat exchanger temperature and the calculated preset first indoor heat exchanger temperature; or calculating to obtain a preset second indoor heat exchanger temperature according to the detected indoor environment temperature and humidity and the compressor frequency, and determining a second difference value according to the detected temperature of the second indoor heat exchanger and the calculated preset second indoor heat exchanger temperature, wherein the first difference value is (the first indoor heat exchanger temperature-the preset first indoor heat exchanger temperature), and the second difference value is (the second indoor heat exchanger temperature-the preset second indoor heat exchanger temperature);
and a control step of controlling and adjusting the opening degree of the first throttling device 41 according to the first difference or the second difference.
This application is through the temperature that detects first indoor heat exchanger, the compressor frequency, the temperature and the humidity of indoor environment, and effectively obtain through calculation and predetermine first indoor heat exchanger temperature, the difference of the temperature with predetermine first indoor heat exchanger temperature of first indoor heat exchanger is as the main factor of the first throttling arrangement aperture of control, can realize two throttling arrangement's among the two temperature air conditioning system stability control effectively, in preventing the actual system control, aperture between two throttling arrangement influences each other, there is the coupling to lead to the unable stability control's the condition, guarantee that two temperature air conditioning system is stable, reliably and move high-efficiently.
Preferably, when the refrigerator is operated, in the calculating step: the refrigeration preset first indoor heat exchanger temperature is determined according to the detected indoor environment temperature and humidity; the control step comprises: adjusting the opening degree of the first throttling device according to the larger absolute value between a refrigeration first difference value between the temperature of the first indoor heat exchanger and the refrigeration preset first indoor heat exchanger and a refrigeration second difference value between the temperature of the second indoor heat exchanger and the refrigeration preset second indoor heat exchanger, wherein the refrigeration first difference value is equal to (the temperature of the first indoor heat exchanger-the temperature of the refrigeration preset first indoor heat exchanger), and the refrigeration second difference value is equal to (the temperature of the second indoor heat exchanger-the temperature of the refrigeration preset second indoor heat exchanger);
when heating operation is performed, the calculating step comprises: the heating preset first indoor heat exchanger temperature is determined according to the detected indoor environment temperature and the compressor frequency; the control step comprises: adjusting the opening of the first throttling device according to the larger absolute value between a heating first difference value between the temperature of the first indoor heat exchanger and the heating preset first indoor heat exchanger and a heating second difference value between the temperature of the second indoor heat exchanger and the heating preset second indoor heat exchanger, wherein the heating first difference value is equal to (the temperature of the first indoor heat exchanger-the temperature of the heating preset first indoor heat exchanger), and the heating second difference value is equal to (the temperature of the second indoor heat exchanger-the temperature of the heating preset second indoor heat exchanger);
according to the optimal control form of different working conditions (refrigeration or heating), the temperature of the first indoor heat exchanger or the temperature of the second indoor heat exchanger under the refrigeration working condition can be obtained, or the temperature of the first indoor heat exchanger or the temperature of the second indoor heat exchanger under the heating working condition can be obtained, the opening degree of the first throttling device is controlled according to the obtained temperature of the first indoor heat exchanger or the obtained temperature of the second indoor heat exchanger, the opening degree of the second throttling device is kept constant, the opening degree of the first throttling device can be effectively controlled, and influence or interference of the two throttling devices can be effectively prevented.
Preferably, during the refrigeration operation, if the absolute value of the first refrigeration difference is large, when the first refrigeration difference between the temperature of the first indoor heat exchanger and the temperature of the refrigeration preset first indoor heat exchanger is greater than 0, the opening degree of the first throttling device is controlled to be reduced; when a first refrigeration difference value between the temperature of the first indoor heat exchanger and the temperature of a refrigeration preset first indoor heat exchanger is smaller than 0, controlling the opening degree of the first throttling device to increase; when a first refrigeration difference value between the temperature of the first indoor heat exchanger and the temperature of a refrigeration preset first indoor heat exchanger is equal to 0, controlling the opening degree of the first throttling device to be unchanged;
if the absolute value of the second refrigeration difference is larger, controlling the opening degree of the first throttling device to be reduced when the second refrigeration difference between the temperature of the second indoor heat exchanger and the temperature of the refrigeration preset second indoor heat exchanger is larger than 0; when a second refrigeration difference value between the temperature of the second indoor heat exchanger and the temperature of a refrigeration preset second indoor heat exchanger is smaller than 0, controlling the opening degree of the first throttling device to increase; when a second refrigeration difference value between the temperature of the second indoor heat exchanger and the temperature of a refrigeration preset second indoor heat exchanger is equal to 0, controlling the opening degree of the first throttling device to be unchanged;
when the air conditioner works in a heating mode, if the absolute value of the first heating difference value is larger, when the first heating difference value between the temperature of the first indoor heat exchanger and the temperature of a preset first indoor heat exchanger for heating is larger than 0, the opening degree of the first throttling device is controlled to be reduced; when a first heating difference value between the temperature of the first indoor heat exchanger and a preset first indoor heat exchanger for heating is smaller than 0, controlling the opening degree of the first throttling device to increase; when a first heating difference value between the temperature of the first indoor heat exchanger and a preset first indoor heat exchanger for heating is equal to 0, controlling the opening degree of the first throttling device to be unchanged;
when the air conditioner works in a heating mode, if the absolute value of the second heating difference value is larger, when the second heating difference value between the temperature of the second indoor heat exchanger and the temperature of a preset second indoor heat exchanger for heating is larger than 0, the opening degree of the first throttling device is controlled to be reduced; when a second heating difference value between the temperature of the second indoor heat exchanger and a preset second indoor heat exchanger for heating is smaller than 0, controlling the opening degree of the first throttling device to increase; and when a second heating difference value between the temperature of the second indoor heat exchanger and the temperature of the preset second indoor heat exchanger for heating is equal to 0, controlling the opening degree of the first throttling device to be unchanged.
This is a further preferable control form of the control method of the present application, when the first difference value of refrigeration between the temperature of the first indoor heat exchanger and the temperature of the refrigeration preset first indoor heat exchanger is greater than 0 ℃, generally basically speaking, the temperature of the first indoor heat exchanger at low temperature is higher, and the magnitude of throttling and pressure reduction is larger, so that it is necessary to appropriately increase the opening degree of the first throttling device to effectively reduce the pressure drop, reduce the temperature of the first indoor heat exchanger, and reduce the first difference value of refrigeration between the temperature of the first indoor heat exchanger and the temperature of the refrigeration preset first indoor heat exchanger, so that the first difference value of refrigeration is within a specified range; on the contrary, when the first difference value of the refrigeration between the temperature of the first indoor heat exchanger and the temperature of the refrigeration preset first indoor heat exchanger is within the preset range, namely 0 ℃, generally, basically, the temperature of the first indoor heat exchanger at the low temperature basically reaches the set temperature, and the temperature of the first indoor heat exchanger does not need to be adjusted, and the opening degree of the first throttling device does not need to be adjusted; the system is ensured to operate stably, reliably and efficiently all the time.
When the first heating difference value between the temperature of the first indoor heat exchanger and the temperature of the preset first indoor heat exchanger for heating is greater than 0 ℃, generally, basically, the temperature of the outdoor heat exchanger at the low temperature is low, and the amplitude of throttling and pressure reduction is small, so that the opening degree of the first throttling device needs to be properly reduced to effectively increase the pressure drop, improve the temperature of the first indoor heat exchanger, and reduce the first difference value between the temperature of the first indoor heat exchanger and the temperature of the preset first indoor heat exchanger for cooling, so that the first difference value is in a specified range; on the contrary, when the first heating difference between the temperature of the first indoor heat exchanger and the preset first indoor heat exchanger for heating is in the preset range, namely 0 ℃, generally, basically, the temperature of the outdoor heat exchanger at the low temperature basically reaches the set temperature, and the temperature of the first indoor heat exchanger and the opening degree of the first throttling device do not need to be adjusted; the system is ensured to operate stably, reliably and efficiently all the time. The control of the second indoor heat exchanger is similar to that of the first indoor heat exchanger, and is not described in detail herein.
Wherein the preset value is a range value.
The present application further provides an air conditioner comprising the dual temperature air conditioning system of any of the preceding claims.
A double-temperature system comprises a double-suction double-row compressor, an oil return device, a first four-way valve, a second four-way valve, an outdoor heat exchanger, a first throttling device, a second throttling device, a first indoor heat exchanger and a second indoor heat exchanger.
The double suction and double discharge compressor has a first cylinder and a second cylinder, a first suction port and a second suction port, a first exhaust port and a second exhaust port. The first cylinder is communicated with the first air suction port and the first air exhaust port respectively, and the second cylinder is communicated with the second air suction port and the second air exhaust port respectively. The volume ratio of the first cylinder to the second cylinder is 0.2-2.5.
The oil return device is communicated with the second exhaust port through a pipeline and is communicated with an oil return port at the bottom of the compressor through a pipeline.
The outdoor heat exchanger is respectively communicated with the first exhaust port and the oil return device of the compressor through the first four-way valve and the second four-way valve.
The first indoor heat exchanger is communicated with the first air suction port through a first four-way valve, and the second indoor heat exchanger is communicated with the second air suction port through a second four-way valve.
The opening degree of the first throttling device is adjustable, the opening degree of the second throttling device is fixed, and the first throttling device is controlled according to a preset temperature control method.
The first throttling device is respectively communicated with the outdoor heat exchanger and the first indoor heat exchanger, and the second throttling device is respectively communicated with the second indoor heat exchanger and the outdoor heat exchanger or the first throttling device.
The preset temperature control method of the first throttling device includes detecting indoor ambient temperature and humidity through a temperature and relative humidity sensor arranged on an indoor side, and detecting temperature of the first indoor heat exchanger through a sensor arranged on the first indoor heat exchanger.
When the refrigeration device runs, the first throttling device is controlled by judging the difference value between the temperature of the first indoor heat exchanger and the temperature of the refrigeration preset first indoor heat exchanger.
When the air conditioner works in a heating mode, the first throttling device is controlled by judging the difference value between the temperature of the first indoor heat exchanger and the temperature of the preset first indoor heat exchanger in the heating mode.
The first indoor heat exchanger temperature is preset for refrigeration and related to the indoor environment temperature and humidity, and the first indoor heat exchanger temperature is preset for heating and related to the indoor environment temperature and the compressor frequency.
In a first embodiment, the oil return device includes an oil separator, an oil return assembly. The oil separator is arranged at a second exhaust port (direct exhaust port) of the double-suction double-row compressor, and the oil return assembly is arranged between the oil separator and an oil return port of an oil pool at the bottom of the compressor. The oil return component comprises an oil return control valve and a connecting pipe, wherein the oil return control valve has two states of opening and conducting (the drift diameter is the same as that of the connecting pipe and has no resistance) and closing and throttling (the drift diameter is smaller than that of the connecting pipe and has resistance).
In a second embodiment, the oil return device comprises an oil separator and an oil return assembly. The oil separator is arranged at a second exhaust port (direct exhaust port) of the double-suction double-row compressor, and the oil return assembly is arranged between the oil separator and an oil return port of an oil pool at the bottom of the compressor. The oil return assembly comprises an oil return switch assembly and an oil return throttling assembly which are connected in parallel, the oil return switch assembly comprises an oil return stop valve and a connecting pipe, and the oil return throttling assembly comprises an oil return capillary pipe and a connecting pipe.
Example 1
A double-temperature system comprises a double-suction double-row compressor 1, an oil separator 6, an oil return control valve 7, a first four-way valve 21, a second four-way valve 22, an outdoor heat exchanger 3, a first throttling device 41, a second throttling device 42, a first indoor heat exchanger 51, a second indoor heat exchanger 52, an outdoor fan 9 and an indoor fan 8. The double suction double row compressor has a first suction port 101 and a first discharge port 103 communicating with a first compression cylinder, and a second suction port 102 and a second discharge port 104 communicating with a second compression cylinder, and an oil return port 105 communicating with a bottom oil sump of the compressor.
The first exhaust port 103 is connected to the outdoor heat exchanger 3 through the first four-way valve 21, the second exhaust port 104 is connected to the oil separator 6, the oil separator 6 is connected to the outdoor heat exchanger 3 through the second four-way valve 22, the first throttling device 41 is connected to the outdoor heat exchanger 3 and the first indoor heat exchanger 51, respectively, the second throttling device 42 is connected to the second indoor heat exchanger 52 and the first throttling device 41, respectively, the first indoor heat exchanger 51 is connected to the first intake port 101 through the first four-way valve 21, and the second indoor heat exchanger 52 is connected to the second intake port 102 through the second four-way valve 22. The oil return control valve 7 is connected to the oil separator 6 and the oil return port 105.
Example 2
An air conditioning system comprises a double-suction double-row compressor 1, an oil separator 6, an oil return stop valve 10, an oil return capillary tube 11, a first four-way valve 21, a second four-way valve 22, an outdoor heat exchanger 3, a first throttling device 41, a second throttling device 42, a first indoor heat exchanger 51, a second indoor heat exchanger 52, an outdoor fan 9 and an indoor fan 8. The double suction double row compressor has a first suction port 101 and a first discharge port 103 communicating with a first compression cylinder, and a second suction port 102 and a second discharge port 104 communicating with a second compression cylinder, and an oil return port 105 communicating with a bottom oil sump of the compressor.
Example 3
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. 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 (10)
1. A dual temperature air conditioning system characterized in that: the method comprises the following steps:
the air conditioner comprises a compressor (1), an outdoor heat exchanger (3), a first indoor heat exchanger (51) and a second indoor heat exchanger (52), wherein the compressor (1) comprises a first cylinder and a second cylinder, the first cylinder is provided with a first air suction port (101) and a first air exhaust port (103), and the second cylinder is provided with a second air suction port (102) and a second air exhaust port (104); the outdoor heat exchanger (3) is connectable to the first exhaust port (103) and the second exhaust port (104) at the same time, the first indoor heat exchanger (51) is connectable to the first intake port (101), and the second indoor heat exchanger (52) is connectable to the second intake port (102); or, the outdoor heat exchanger (3) may be communicated to the first suction port (101) and the second suction port (102) at the same time, the first indoor heat exchanger (51) may be communicated to the first exhaust port (103), and the second indoor heat exchanger (52) may be communicated to the second exhaust port (104);
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 gas discharged by the first cylinder and the gas discharged by the second cylinder are mixed in the shell of the compressor and then discharged through a third air discharge port (106): the outdoor heat exchanger (3) is communicable to the third exhaust port (106), the first indoor heat exchanger (51) is communicable to the first suction port (101), and the second indoor heat exchanger (52) is communicable to the second suction port (102); or, the outdoor heat exchanger (3) can be communicated to the first suction port (101) and the second suction port (102) at the same time, the first indoor heat exchanger (51) can be communicated to the third discharge port (106), and the second indoor heat exchanger (52) can also be communicated to the third discharge port (106);
a first pipeline (12) communicated with the first indoor heat exchanger (51) and a second pipeline (13) communicated with the second indoor heat exchanger (52) are converged and then communicated to the outdoor heat exchanger (3) through a third pipeline (14), a first throttling device (41) is arranged on the third pipeline (14), and a second throttling device (42) is arranged on the second pipeline (13);
the opening degree of the first throttling device (41) can be adjusted, the opening degree of the second throttling device (42) is fixed, and the opening degree of the first throttling device (41) can be controlled and adjusted according to the temperature of the first indoor heat exchanger (51) or the second indoor heat exchanger (52).
2. A dual temperature air conditioning system as set forth in claim 1, wherein:
during cooling operation, the outdoor heat exchanger (3) is communicated to the first exhaust port and the second exhaust port at the same time, the first indoor heat exchanger (51) is communicated to the first air suction port, and the second indoor heat exchanger (52) is communicated to the second air suction port; presetting a first indoor heat exchanger temperature for refrigeration, presetting a second indoor heat exchanger temperature for refrigeration, wherein the opening degree of the first throttling device (41) can be adjusted according to a refrigeration first difference value of the temperature of the first indoor heat exchanger (51) and the refrigeration preset first indoor heat exchanger temperature and a larger absolute value between a refrigeration second difference value of the temperature of the second indoor heat exchanger (52) and the refrigeration preset second indoor heat exchanger temperature, wherein the refrigeration first difference value is (the first indoor heat exchanger temperature-refrigeration preset first indoor heat exchanger temperature), and the refrigeration second difference value is (the second indoor heat exchanger temperature-refrigeration preset second indoor heat exchanger temperature).
3. A dual temperature air conditioning system as claimed in claim 1 or 2, wherein:
in heating operation, the outdoor heat exchanger (3) is communicated to the first air suction port and the second air suction port at the same time, the first indoor heat exchanger (51) is communicated to the first exhaust port, and the second indoor heat exchanger (52) is communicated to the second exhaust port; presetting a first indoor heat exchanger temperature for heating, presetting a second indoor heat exchanger temperature for heating, wherein the opening degree of the first throttling device (41) can be adjusted according to a heating first difference value of the first indoor heat exchanger temperature and the heating preset first indoor heat exchanger temperature and a larger absolute value between the second indoor heat exchanger temperature and a heating second difference value of the heating preset second indoor heat exchanger temperature, wherein the heating first difference value is (the first indoor heat exchanger temperature-the heating preset first indoor heat exchanger temperature), and the heating second difference value is (the second indoor heat exchanger temperature-the heating preset second indoor heat exchanger temperature).
4. A dual temperature air conditioning system as claimed in any one of claims 1 to 3, wherein:
when the compressor comprises a first exhaust port and a second exhaust port, the dual-temperature air conditioning system further comprises a first four-way valve (21) and a second four-way valve (22), wherein four ports of the first four-way valve (21) are respectively communicated to the first air suction port, the first exhaust port, the outdoor heat exchanger (3) and the first indoor heat exchanger (51), and four ports of the second four-way valve (22) are respectively communicated to the second air suction port, the second exhaust port, the outdoor heat exchanger (3) and the second indoor heat exchanger (52); or,
when the compressor comprises a third exhaust port, the dual-temperature air conditioning system further comprises a first four-way valve (21) and a second four-way valve (22), four ports of the first four-way valve (21) are respectively communicated to the first air suction port, the third exhaust port, the outdoor heat exchanger (3) and the first indoor heat exchanger (51), and four ports of the second four-way valve (22) are respectively communicated to the second air suction port, the third exhaust port, the outdoor heat exchanger (3) and the second indoor heat exchanger (52).
5. A dual temperature air conditioning system as claimed in any one of claims 1 to 4, wherein:
the oil return device is arranged at the second air outlet and can return oil in the gas exhausted by the second air outlet to the bottom of the inner cavity of the compressor (1);
the oil return device comprises an oil separator (6) and an oil return assembly, the second exhaust port is communicated with the oil separator (6) through an exhaust pipeline, the bottom of the oil separator (6) 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 (7) arranged on the oil return pipeline; or,
the oil return device comprises an oil separator (6) and an oil return assembly, the second exhaust port is communicated with the oil separator (6) through an exhaust pipeline, the bottom of the oil separator (6) 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 (10) 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 (11) is arranged on the parallel pipeline.
6. A dual temperature air conditioning system as claimed in any one of claims 1 to 5, wherein:
the air conditioner further comprises an indoor fan (8), the first indoor heat exchanger (51) and the second indoor heat exchanger (52) are arranged side by side, and the indoor fan (8) is arranged on one side of the second indoor heat exchanger (52) so that airflow sequentially flows through the first indoor heat exchanger (51), the second indoor heat exchanger (52) and the indoor fan (8).
7. A control method suitable for the dual temperature air conditioning system of any one of claims 1 to 6, characterized in that: the method comprises the following steps:
a detection step for detecting the temperature of the first indoor heat exchanger, the temperature of the second indoor heat exchanger, the frequency of a compressor, and the temperature and humidity of an indoor environment;
a calculating step, namely calculating to obtain a preset first indoor heat exchanger temperature according to the detected indoor environment temperature and humidity and the compressor frequency, and determining a first difference value according to the detected first indoor heat exchanger temperature and the calculated preset first indoor heat exchanger temperature; or calculating to obtain a preset second indoor heat exchanger temperature according to the detected indoor environment temperature and humidity and the compressor frequency, and determining a second difference value according to the detected temperature of the second indoor heat exchanger and the calculated preset second indoor heat exchanger temperature, wherein the first difference value is (the first indoor heat exchanger temperature-the preset first indoor heat exchanger temperature), and the second difference value is (the second indoor heat exchanger temperature-the preset second indoor heat exchanger temperature);
and a control step of controlling and adjusting the opening degree of the first throttling device (41) according to the first difference or the second difference.
8. The control method according to claim 7, characterized in that:
when the refrigeration is operated, the calculation step comprises the following steps: the refrigeration preset first indoor heat exchanger temperature is determined according to the detected indoor environment temperature and humidity; the control step comprises: adjusting the opening degree of the first throttling device according to the larger absolute value between a refrigeration first difference value between the temperature of the first indoor heat exchanger and the refrigeration preset first indoor heat exchanger and a refrigeration second difference value between the temperature of the second indoor heat exchanger and the refrigeration preset second indoor heat exchanger, wherein the refrigeration first difference value is equal to (the temperature of the first indoor heat exchanger-the temperature of the refrigeration preset first indoor heat exchanger), and the refrigeration second difference value is equal to (the temperature of the second indoor heat exchanger-the temperature of the refrigeration preset second indoor heat exchanger);
when heating operation is performed, the calculating step comprises: the heating preset first indoor heat exchanger temperature is determined according to the detected indoor environment temperature and the compressor frequency; the control step comprises: the opening size of the first throttling device is adjusted according to the fact that the absolute value between the first heating difference value of the first indoor heat exchanger temperature and the preset heating first indoor heat exchanger temperature and the absolute value between the second indoor heat exchanger temperature and the preset heating second difference value of the second indoor heat exchanger temperature are larger, wherein the first heating difference value is equal to (the first indoor heat exchanger temperature-the preset heating first indoor heat exchanger temperature), and the second heating difference value is equal to (the second indoor heat exchanger temperature-the preset heating second indoor heat exchanger temperature).
9. The control method according to claim 8, characterized in that:
when the first difference value of the refrigeration is larger during the refrigeration operation, when the first difference value of the first indoor heat exchanger temperature and the refrigeration preset first indoor heat exchanger temperature is larger than 0, the opening degree of the first throttling device is controlled to be reduced; when a first refrigeration difference value between the temperature of the first indoor heat exchanger and the temperature of a refrigeration preset first indoor heat exchanger is smaller than 0, controlling the opening degree of the first throttling device to increase; when a first refrigeration difference value between the temperature of the first indoor heat exchanger and the temperature of a refrigeration preset first indoor heat exchanger is equal to 0, controlling the opening degree of the first throttling device to be unchanged;
when the air conditioner works in a heating mode, if the absolute value of the first heating difference value is larger, when the first heating difference value between the temperature of the first indoor heat exchanger and the temperature of a preset first indoor heat exchanger for heating is larger than 0, the opening degree of the first throttling device is controlled to be reduced; when a first heating difference value between the temperature of the first indoor heat exchanger and a preset first indoor heat exchanger for heating is smaller than 0, controlling the opening degree of the first throttling device to increase; and when a first heating difference value between the temperature of the first indoor heat exchanger and the temperature of a preset first indoor heat exchanger for heating is equal to 0, controlling the opening degree of the first throttling device to be unchanged.
10. An air conditioner, characterized in that: comprising a dual temperature air conditioning system as claimed in any one of claims 1-6.
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