CN111609590B - 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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- CN111609590B CN111609590B CN202010331320.0A CN202010331320A CN111609590B CN 111609590 B CN111609590 B CN 111609590B CN 202010331320 A CN202010331320 A CN 202010331320A CN 111609590 B CN111609590 B CN 111609590B
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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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Abstract
The invention provides a dual-temperature air conditioning system, a control method and an air conditioner, wherein the dual-temperature air conditioning system comprises: the air conditioner comprises a compressor, an outdoor heat exchanger, a first indoor heat exchanger and a second indoor heat exchanger, wherein the compressor comprises a first cylinder and a second cylinder; the outdoor heat exchanger is communicated with the first indoor heat exchanger through a first pipeline, the first pipeline is provided with a first throttling device, the outdoor heat exchanger is also communicated with the second indoor heat exchanger through a second pipeline, and the second pipeline is provided with a second throttling device; the opening degree of the first throttling device can be controlled and adjusted according to the suction superheat degree of the first suction port, and the opening degree of the second throttling device can be controlled and adjusted in a constant proportion according to the opening degree of the first throttling device. According to the invention, the two throttling devices in the dual-temperature air-conditioning system can be stably controlled, the situation that the opening degrees of 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 ensured to stably, reliably and efficiently run.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a dual-temperature air conditioner 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 are in parallel connection, 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 invention 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 invention 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 is capable of being communicated to the first exhaust port and the second exhaust port simultaneously, the first indoor heat exchanger is capable of being communicated to the first suction port, and the second indoor heat exchanger is capable of being communicated to the second suction port; or, the outdoor heat exchanger may be communicated to the first suction port and the second suction port at the same time, the first indoor heat exchanger may be communicated to the first exhaust port, and the second indoor heat exchanger may be communicated to the second exhaust port;
or, the first cylinder has a first air suction port, the second cylinder has a second air suction port, and the gas discharged from the first cylinder and the gas discharged from the second cylinder are mixed in the shell of the compressor and then discharged through a third air discharge port: the outdoor heat exchanger is communicable to the third air outlet, the first indoor heat exchanger is communicable to the first air intake, and the second indoor heat exchanger is communicable to the second air intake; 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 discharge port, and the second indoor heat exchanger can be communicated to the third air discharge port;
the outdoor heat exchanger is communicated with the first indoor heat exchanger through a first pipeline, a first throttling device is arranged on the first pipeline, the outdoor heat exchanger is also communicated with the second indoor heat exchanger through a second 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 can be adjusted, the opening degree of the first throttling device can be controlled and adjusted according to the suction superheat degree of the first air suction port, and the opening degree of the second throttling device can be controlled and adjusted in a constant proportion according to the opening degree of the first throttling device.
Preferably, during cooling operation, the outdoor heat exchanger is communicated to the first exhaust port and the second exhaust port at the same time, or the outdoor heat exchanger is communicated to the third exhaust port, 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; the suction superheat degree of the first suction port is a first suction superheat degree, the first suction superheat degree is equal to (first suction temperature-first indoor heat exchanger temperature), the opening degree of the first throttling device can be adjusted according to the difference value of the first suction superheat degree and a first preset value, and the first suction temperature is the suction temperature at the first suction port.
Preferably, in heating operation, the outdoor heat exchanger is communicated to the first suction port and the second suction port at the same time, the first indoor heat exchanger is communicated to the first exhaust port or the third exhaust port, and the second indoor heat exchanger is communicated to the second exhaust port or the third exhaust port; the suction superheat degree of the first suction port is a first suction superheat degree, the first suction superheat degree is equal to (a first suction temperature-an outdoor heat exchanger temperature), the opening degree of the first throttling device can be adjusted according to the difference value of the first suction superheat degree and a second preset value, and the first suction temperature is the suction temperature at the first suction port.
Preferably, the air conditioner further comprises a first four-way valve and a second four-way valve, wherein four ports of the first four-way valve are respectively communicated to the first air suction port, the first air 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 air exhaust port, the outdoor heat exchanger and the second indoor heat exchanger;
or when a third exhaust port is included, 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; alternatively, the first and second electrodes may be,
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 is arranged on the parallel pipeline.
Preferably, the indoor heat exchanger comprises a first indoor heat exchanger and a second indoor heat exchanger, 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.
The invention also provides a control method suitable for the dual-temperature air conditioning system, which comprises the following steps:
a detection step of detecting a temperature of the outdoor heat exchanger, detecting a temperature of the first indoor heat exchanger, and detecting a first suction temperature of a first suction port of the compressor;
a calculating step, which is used for calculating and obtaining a first suction gas superheat degree according to the detected temperature of the outdoor heat exchanger, the detected temperature of the first indoor heat exchanger and the detected first suction gas temperature;
and a control step of controlling and adjusting the opening degree of the first throttling device according to the first suction superheat degree, and simultaneously controlling and adjusting the opening degree of the second throttling device in a constant proportion according to the opening degree of the first throttling device.
Preferably, when the refrigerator is operated, in the calculating step: the first air suction superheat degree is equal to a first air suction temperature-a first indoor heat exchanger temperature; the control step comprises: adjusting the opening degree of the first throttling device according to the difference value of the first suction gas superheat degree and a first preset value, wherein the first suction gas temperature is the suction gas temperature at the first suction port; controlling the opening size of the second throttling device to be the opening size of the first throttling device, wherein k is a constant between 0 and 100;
when heating operation is performed, the calculating step comprises: the first suction gas superheat degree (first suction gas temperature-outdoor heat exchanger temperature); the control step comprises: adjusting the opening degree of the first throttling device according to the difference value of the first suction gas superheat degree and a second preset value, wherein the first suction gas temperature is the suction gas temperature at the first suction port; and controlling the opening size of the second throttling device to be the opening size of the first throttling device, wherein k is a constant between 0 and 100.
Preferably, when the difference value between the first suction superheat degree and a first preset value is greater than 0 during the refrigerating operation, the opening degree of the first throttling device is controlled to be increased; when the difference value of the first air suction superheat degree and a first preset value is smaller than 0, controlling the opening degree of the first throttling device to be reduced, wherein the first preset value is a range interval of positive numbers;
when the difference value between the first air suction superheat degree and a second preset value is larger than 0 during heating operation, controlling the opening degree of the first throttling device to increase; and when the difference value of the first air suction superheat degree and a second preset value is less than 0, controlling the opening degree of the first throttling device to be reduced, wherein the second preset value is a range interval of positive numbers.
The invention also provides an air conditioner which comprises the dual-temperature air conditioning system.
The invention provides a dual-temperature air conditioning system, a control method and an air conditioner, which have the following beneficial effects:
the invention arranges at least two compressors of independent cylinders, a first indoor heat exchanger communicated with the first cylinder and a second indoor heat exchanger communicated with the second cylinder, and a first throttling device arranged on a first pipeline between the 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, and the degree of superheat of air suction is used as a main factor for controlling the opening of the first throttling device, and the opening of the second throttling device is adjusted in a constant proportion according to the opening of the first throttling device, so that the stable control of the two throttling devices in the dual-temperature air-conditioning system can be effectively realized, the conditions that the opening between the two throttling devices is influenced mutually and cannot be stably controlled due to coupling in actual system control are prevented, 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 invention;
FIG. 2 is a system diagram of a first embodiment of a dual temperature air conditioning system of the present invention;
FIG. 3 is a system diagram of a third embodiment of a dual temperature air conditioning system of the present invention;
FIG. 4 is a structural diagram of a double suction and double discharge compressor in the dual temperature air conditioning system of the present invention;
fig. 5 is a system diagram of a dual-temperature air conditioning system according to a fourth embodiment of the present invention.
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 to 5, the present invention provides a dual temperature air conditioning system, which includes:
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 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 first exhaust port 103, and the second indoor heat exchanger 52 can be communicated to the second exhaust port 104 (as shown in fig. 1-4, embodiments one, two and three, the compressor is a double-row double-suction compressor);
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: in a cooling working condition, the outdoor heat exchanger 3 can be communicated to the third exhaust port 106, the first indoor heat exchanger 51 can be communicated to the first suction port 101, and the second indoor heat exchanger 52 can be communicated to the second suction port 102; alternatively, in the heating operation, the outdoor heat exchanger 3 can be simultaneously connected to the first suction port 101 and the second suction port 102, the first indoor heat exchanger 51 can be connected to the third discharge port 106, and the second indoor heat exchanger 52 can also be connected to the third discharge port 106 (as shown in fig. 5, in the fourth embodiment, the compressor is a single-row double-suction compressor);
a first pipeline 12 communicating with the first indoor heat exchanger 51 and a second pipeline 13 communicating with the second indoor heat exchanger 52 are joined together and communicated to the outdoor heat exchanger 3 through a third pipeline 14, a first throttling device 41 is provided on the first pipeline 12 (embodiment 1) or the third pipeline 14 (embodiment 3), and a second throttling device 42 is provided on the second pipeline 13;
the opening degree of the first throttle device 41 is adjustable, the opening degree of the second throttle device 42 is adjustable, the opening degree of the first throttle device 41 is controllable and adjustable according to the suction superheat degree of the first suction port, and the opening degree of the second throttle device 42 is controllable and adjustable in a constant proportion according to the opening degree of the first throttle device 41.
The invention arranges at least two compressors of independent cylinders, a first indoor heat exchanger communicated with the first cylinder and a second indoor heat exchanger communicated with the second cylinder, and a first throttling device arranged on a first pipeline between the 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, and the degree of superheat of air suction is used as a main factor for controlling the opening of the first throttling device, and the opening of the second throttling device is adjusted in a constant proportion according to the opening of the first throttling device, so that the stable control of the two throttling devices in the dual-temperature air-conditioning system can be effectively realized, the conditions that the opening between the two throttling devices is influenced mutually and cannot be stably controlled due to coupling in actual system control are prevented, 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, or the outdoor heat exchanger 3 is communicated to the third exhaust port, 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; the suction superheat degree of the first suction port is a first suction superheat degree, the first suction superheat degree is equal to a first suction temperature-first indoor heat exchanger temperature, the opening degree of the first throttling device can be adjusted according to the difference value of the first suction superheat degree and a first preset value, and the first suction temperature is the suction temperature at the first suction port.
The preferable structure form of the dual-temperature air conditioning system of the invention under the working condition of refrigeration operation is that the first exhaust port of the first cylinder is communicated with the outdoor heat exchanger, the first indoor heat exchanger is communicated with the first intake port of the first cylinder, the second exhaust port of the second cylinder is communicated with the outdoor heat exchanger, the second indoor heat exchanger is communicated with the second intake port of the second cylinder, as the first indoor heat exchanger is communicated with the first intake port of the first cylinder, the first intake superheat degree is obtained by the difference between the first intake temperature and the temperature of the first indoor heat exchanger, the opening degree of the first throttling device is controlled and adjusted by the obtained difference between the first intake superheat degree and the first preset value, the opening degree of the second throttling device is controlled and adjusted according to the opening degree of the first throttling device in a constant proportion (for example, the constant proportion is 80%, if the first throttling device is fully opened, the opening degree of the second throttling device is 80%) to obtain the optimal opening degree of the two throttling devices under the refrigeration working condition, so that the two throttling devices are stably controlled, the 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 ensured.
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 or the third exhaust port, and the second indoor heat exchanger 52 is communicated to the second exhaust port or the third exhaust port; the suction superheat degree of the first suction port is a first suction superheat degree, the first suction superheat degree is a first suction temperature-outdoor heat exchanger temperature, the opening degree of the first throttling device can be adjusted according to the difference value of the first suction superheat degree and a second preset value, and the first suction temperature is the suction temperature at the first suction port.
The preferable structure form of the dual-temperature air conditioning system under the heating operation condition is that the first exhaust port of the first cylinder is communicated with the first indoor heat exchanger, the outdoor heat exchanger is communicated with the first air suction port of the first cylinder, the second exhaust port of the second cylinder is communicated with the second indoor heat exchanger, the outdoor heat exchanger is communicated with the second air suction port of the second cylinder, as the outdoor heat exchanger is communicated with the first air suction port of the first cylinder, the first air suction superheat degree is obtained by the difference between the first air suction temperature and the temperature of the outdoor heat exchanger, the opening degree of the first throttling device is controlled and adjusted by the obtained difference between the first air suction superheat degree and the second preset value, the opening degree of the second throttling device is controlled and adjusted according to the opening degree of the first throttling device in a constant proportion (for example, the constant proportion is 80%, if the first throttling device is fully opened, the opening degree of the second throttling device is 80%) to obtain the optimal opening degree of the two throttling devices under the heating working condition, so that the two throttling devices are stably controlled, the 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 ensured.
Preferably, a first four-way valve 21 and a second four-way valve 22 are further included, 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 (as shown in fig. 1-4); or when a third exhaust port 106 is included, four ports of the first four-way valve 21 are respectively communicated to the first 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 suction port, the third exhaust port, the outdoor heat exchanger 3 and the second indoor heat exchanger 52 (see fig. 5). The first four-way valve can realize effective switching of the first indoor heat exchanger as a refrigerating and heating condition, and the second four-way valve can realize effective switching of the second indoor heat exchanger as a refrigerating and heating condition.
Preferably, the compressor further comprises an oil return device, wherein the oil return device is arranged at the second air outlet and is used for returning oil in the air discharged by the second air outlet 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 invention, 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 action can be performed when oil return is required.
As shown in fig. 2, or 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 pipe, the bottom of the oil separator 6 is communicated to the bottom of the inner cavity of the compressor 1 through an oil return pipe, the oil return assembly includes a second oil return control valve 10 arranged on the oil return pipe and a parallel pipe connected in parallel with the second oil return control valve, and an oil return capillary 11 is arranged on the parallel pipe. This is a preferable configuration of the oil return device according to embodiment 2 of the present invention, and the second oil return control valve and the oil return line are provided to effectively control the opening and closing of the oil return passage, so that an effective oil return action (a large flow rate) can be performed when oil return is required, and an oil return action (a small flow rate) with a throttling degree can be performed by the oil return capillary tube 11 when the second oil return control valve is closed, thereby effectively ensuring that the oil return process is continuously and effectively performed.
Preferably, an indoor fan 8 is further included, 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 the airflow sequentially flows through the first indoor heat exchanger 51, the second indoor heat exchanger 52 and the indoor fan 8. The air conditioning system is a further preferred structural form of the air conditioning system, the two indoor heat exchangers are combined, and the heat exchange effect is carried out on the two indoor heat exchangers through the indoor fan, so that the effective integration of the heat exchangers is realized, the structure is compact, the effect of airflow cascade cooling can be realized, the heat exchange temperature difference is reduced, and the energy efficiency level of the system is improved.
The invention also provides a control method suitable for the dual-temperature air conditioning system, which comprises the following steps:
a detection step of detecting a temperature of the outdoor heat exchanger, detecting a temperature of the first indoor heat exchanger, and detecting a first suction temperature of a first suction port of the compressor;
a calculating step, which is used for calculating and obtaining a first suction gas superheat degree according to the detected temperature of the outdoor heat exchanger, the detected temperature of the first indoor heat exchanger and the detected first suction gas temperature;
a control step of controlling and adjusting the opening degree of the first throttling device 41 according to the first suction superheat degree, and controlling and adjusting the opening degree of the second throttling device 42 according to the opening degree of the first throttling device 41 in a constant proportion.
According to the invention, the temperature of the outdoor heat exchanger, the temperature of the first indoor heat exchanger and the first air suction temperature of the first air suction port of the compressor are detected, the first air suction superheat degree of the first air cylinder is effectively obtained through calculation, the first air suction superheat degree is taken as a main factor for controlling the opening degree of the first throttling device, and the opening degree of the second throttling device is regulated in a constant proportion according to the opening degree of the first throttling device, so that the stable control of the two throttling devices in the dual-temperature air-conditioning system can be effectively realized, the conditions that the opening degrees of the two throttling devices are mutually influenced and cannot be stably controlled due to coupling in the actual system control are prevented, and the stable, reliable and efficient operation of the dual-temperature air-conditioning system is ensured.
Preferably, when the refrigerator is operated, in the calculating step: the first air suction superheat degree is equal to a first air suction temperature-a first indoor heat exchanger temperature; the control step comprises: adjusting the opening degree of the first throttling device according to the difference value of the first suction gas superheat degree and a first preset value, wherein the first suction gas temperature is the suction gas temperature at the first suction port; controlling the opening size of the second throttling device to be the opening size of the first throttling device, wherein k is a constant between 0 and 100;
when heating operation is performed, the calculating step comprises: the first air suction superheat degree is equal to a first air suction temperature-outdoor heat exchanger temperature; the control step comprises: adjusting the opening degree of the first throttling device according to the difference value of the first suction gas superheat degree and a second preset value, wherein the first suction gas temperature is the suction gas temperature at the first suction port; and controlling the opening size of the second throttling device to be the opening size of the first throttling device, wherein k is a constant between 0 and 100.
According to the control method, the first air suction superheat degree under the refrigeration working condition or the first air suction superheat degree under the heating working condition can be obtained according to the preferred control modes of different working conditions (refrigeration or heating), the opening degree of the first throttling device is controlled according to the obtained first air suction superheat degree, the second throttling device is adjusted according to the constant proportion of the opening degree of the first throttling device, the opening degrees of the two throttling devices can be effectively controlled, and the influence or interference of the two throttling devices can be effectively prevented.
Preferably, when the difference value between the first suction superheat degree and a first preset value is greater than 0 during the refrigerating operation, the opening degree of the first throttling device is controlled to be increased; when the difference value of the first air suction superheat degree and a first preset value is less than 0, controlling the opening degree of the first throttling device to be reduced, wherein the first preset value is a range interval (such as [3,5]) of a positive number;
when the difference value between the first air suction superheat degree and a second preset value is larger than 0 during heating operation, controlling the opening degree of the first throttling device to increase; and when the difference between the first air suction superheat degree and a second preset value is less than 0, controlling the opening degree of the first throttling device to be reduced, wherein the second preset value is a range interval (such as [7,9]) of positive number.
This is a further preferable control form of the control method of the present invention, during refrigeration, when a difference between the first suction gas superheat degree and the first preset value is greater than 0, basically, the first suction gas superheat degree is described as being larger, and further, the refrigerant flowing through the first indoor heat exchanger for heat exchange is described as being smaller, so that the temperature after evaporation and heat absorption is higher, and therefore, it is necessary to appropriately increase the opening degree of the first throttling device to increase the flow rate of the refrigerant in the system, increase the flow rate of the refrigerant entering the evaporator for heat exchange, and effectively reduce the first suction gas superheat degree, so that the first suction gas superheat degree is within a range specified by the first preset value; on the contrary, when the difference between the first suction superheat degree and the first preset value is less than 0, generally, the first suction superheat degree is basically small, and further, the refrigerant flowing through the first indoor heat exchanger for heat exchange is large, so that the temperature after evaporation and heat absorption is low, therefore, the opening degree of the first throttling device needs to be properly reduced, so as to reduce the flow of the refrigerant in the system, reduce the flow of the refrigerant entering the evaporator for heat exchange, and effectively improve the first suction superheat degree, so that the first suction superheat degree is within the range specified by the first preset value; the system is ensured to operate stably, reliably and efficiently all the time.
During heating, when the difference between the first air suction superheat degree and the second preset value is greater than 0, the first air suction superheat degree is generally basically larger, and further, the refrigerant which is subjected to heat exchange by the outdoor heat exchanger is smaller in flow rate, so that the temperature after evaporation and heat absorption is higher, therefore, the opening degree of the first throttling device needs to be properly increased to increase the flow rate of the refrigerant in the system, increase the flow rate of the refrigerant which enters the outdoor heat exchanger for heat exchange, and effectively reduce the first air suction superheat degree, so that the first air suction superheat degree is in a range specified by the second preset value; on the contrary, when the difference between the first suction superheat degree and the second preset value is less than 0, generally, the first suction superheat degree is basically small, and further, the flow of the refrigerant subjected to heat exchange by the outdoor heat exchanger is large, so that the temperature after evaporation and heat absorption is low, therefore, the opening degree of the first throttling device needs to be properly reduced, so as to reduce the flow of the refrigerant in the system, reduce the flow of the refrigerant entering the evaporator for heat exchange, and effectively improve the first suction superheat degree, so that the first suction superheat degree is within the range specified by the second preset value; therefore, the regulation and control processes of the two throttling devices are effectively ensured to be in stable operation, and the system is ensured to be always operated stably, reliably and efficiently.
The invention also provides an air conditioner which comprises the dual-temperature air conditioning system.
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 adjustable, the first throttling device is controlled according to a suction superheat degree control method, and the opening degree of the second throttling device is controlled according to a constant proportion of the opening degree of the first throttling device.
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 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 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).
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.
The control method of the suction superheat degree of the first throttling device comprises the steps that the temperature of the outdoor heat exchanger is detected through a sensor arranged on the outdoor heat exchanger, the temperature of the first indoor heat exchanger is detected through a sensor arranged on the first indoor heat exchanger, and the first suction temperature is detected through a temperature sensor arranged on a first suction port of the compressor.
During the refrigerating operation, the first throttling device is controlled by judging the difference between the first suction gas superheat degree (the difference between the first suction gas temperature and the first indoor heat exchanger temperature) and a first preset value, and the second throttling device is controlled according to the constant proportion of the opening degree of the first throttling device (for example, when the first throttling device is 300 pulses, the second throttling device is 240 pulses).
During heating operation, the first throttling device is controlled by judging the difference between the first suction superheat (the first suction temperature and the temperature of the outdoor heat exchanger) and a first preset value, the second throttling device is controlled according to the constant proportion of the opening of the first throttling device, and the proportionality coefficients (the proportionality coefficients are the opening proportion, or the pulse proportion, and are the proportion between the second throttling device and the first throttling device) can be different during refrigerating operation and heating operation.
Example 1
A double-temperature system comprises a double-suction double-row compressor 1, an oil separator 6, a first 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 outdoor heat exchanger 3 and the second indoor heat exchanger 52, 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 first 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, a second oil return control 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
A double-temperature system comprises a double-suction double-row compressor 1, an oil separator 6, a first 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 first oil return control valve 7 is connected to the oil separator 6 and the oil return port 105.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, 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 invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
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 has a first intake port (101) and a first exhaust port (103), and the second cylinder has a second intake port (102) and a second 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 first pipeline (12) or 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) can be adjusted, the opening degree of the first throttling device (41) can be controlled and adjusted according to the suction superheat degree of the first suction port, and the opening degree of the second throttling device (42) can be controlled and adjusted in a constant proportion according to the opening degree of the first throttling device (41).
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, or the outdoor heat exchanger (3) is communicated to the third exhaust port, 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; the suction superheat degree of the first suction port is a first suction superheat degree, the first suction superheat degree = (the first suction superheat degree-the temperature of the first indoor heat exchanger), the opening degree of the first throttling device can be adjusted according to the difference between the first suction superheat degree and a first preset value, and the first suction temperature is the suction temperature at the first suction port.
3. A dual temperature air conditioning system as set forth in claim 1, 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 or the third exhaust port, and the second indoor heat exchanger (52) is communicated to the second exhaust port or the third exhaust port; the suction superheat degree of the first suction port is a first suction superheat degree, the first suction superheat degree = (first suction superheat degree-outdoor heat exchanger temperature), the opening degree of the first throttling device can be adjusted according to the difference between the first suction superheat degree and a second preset value, and the first suction temperature is the suction temperature at the first suction port.
4. A dual temperature air conditioning system as claimed in any one of claims 1 to 3, wherein:
also 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 a third exhaust port is included, 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 3, 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; alternatively, the first and second electrodes may be,
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 3, 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 of detecting a temperature of the outdoor heat exchanger, detecting a temperature of the first indoor heat exchanger, and detecting a first suction temperature of a first suction port of the compressor;
a calculating step, which is used for calculating and obtaining a first suction gas superheat degree according to the detected temperature of the outdoor heat exchanger, the detected temperature of the first indoor heat exchanger and the detected first suction gas temperature;
a control step of controlling and adjusting the opening degree of the first throttling device (41) according to the first suction superheat degree, and controlling and adjusting the opening degree of the second throttling device (42) according to the opening degree of the first throttling device (41) in a constant proportion.
8. The control method according to claim 7, characterized in that:
when the refrigeration is operated, the calculation step comprises the following steps: the first suction superheat = first suction temperature-first indoor heat exchanger temperature; the control step comprises: adjusting the opening degree of the first throttling device according to the difference value of the first suction gas superheat degree and a first preset value, wherein the first suction gas temperature is the suction gas temperature at the first suction port; controlling the opening size of the second throttling device = the opening size of the first throttling device x k%, wherein k is a constant between 0 and 100;
when heating operation is performed, the calculating step comprises: the first suction gas superheat degree = (first suction gas temperature-outdoor heat exchanger temperature); the control step comprises: adjusting the opening degree of the first throttling device according to the difference value of the first suction gas superheat degree and a second preset value, wherein the first suction gas temperature is the suction gas temperature at the first suction port; controlling the opening size of the second throttle device = the opening size of the first throttle device x k%, where k is a constant between 0 and 100.
9. The control method according to claim 8, characterized in that:
when the refrigerating operation is carried out, when the difference value between the first air suction superheat degree and a first preset value is larger than 0, controlling the opening degree of the first throttling device to increase; when the difference value of the first air suction superheat degree and a first preset value is smaller than 0, controlling the opening degree of the first throttling device to be reduced, wherein the first preset value is a range interval of positive numbers;
when the difference value between the first air suction superheat degree and a second preset value is larger than 0 during heating operation, controlling the opening degree of the first throttling device to increase; and when the difference value of the first air suction superheat degree and a second preset value is less than 0, controlling the opening degree of the first throttling device to be reduced, wherein the second preset value is a range interval of positive numbers.
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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