CN111609584B - Dual-temperature air conditioning system, control method and air conditioner - Google Patents
Dual-temperature air conditioning system, control method and air conditioner Download PDFInfo
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- CN111609584B CN111609584B CN202010331299.4A CN202010331299A CN111609584B CN 111609584 B CN111609584 B CN 111609584B CN 202010331299 A CN202010331299 A CN 202010331299A CN 111609584 B CN111609584 B CN 111609584B
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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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- Air Conditioning Control Device (AREA)
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 first throttling device can be adjusted by taking the determined preset reference as a reference according to the first difference, and the opening degree of the second throttling device and the opening degree of the first throttling device are in a constant proportion. According to the invention, the two throttling devices can be stably controlled, the condition 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 stable, reliable and efficient operation of the dual-temperature air conditioning system is ensured.
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;
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 first pipeline or the third pipeline, and a second throttling device is arranged on the second pipeline;
the opening degree of the first throttling device corresponds to one of a plurality of preset reference opening degrees in a preset throttling device opening degree table, and can be adjusted by taking a determined preset reference as a reference according to a first difference value between a first exhaust temperature of the first exhaust port and a preset first exhaust temperature threshold value; the ratio of the opening degree of the second throttling device to the opening degree of the first throttling device is constant.
Preferably, the first and second electrodes are formed of a metal,
the adjustment amount of the opening degree adjustment of the first throttle device is positively correlated with the first difference.
Preferably, the first and second electrodes are formed of a metal,
the preset throttle device opening degree table comprises a plurality of outdoor environment temperature preset ranges and compressor operation frequency preset ranges, different preset reference opening degrees respectively correspond to different outdoor environment temperature preset ranges and different compressor operation frequency preset ranges, and the first throttle device corresponds to one of the different preset reference opening degrees and takes the corresponding preset reference opening degree as an adjustment reference.
Preferably, the first and second electrodes are formed of a metal,
the preset throttle device opening degree table further comprises an upper adjustment limit and a lower adjustment limit corresponding to a plurality of different preset reference opening degrees, and the first throttle device is adjusted between the upper adjustment limit and the lower adjustment limit corresponding to the corresponding preset reference opening degrees.
Preferably, the first and second electrodes are formed of a metal,
the preset throttle device opening degree table comprises a plurality of outdoor environment temperature preset ranges and compressor operation frequency preset ranges, a plurality of different compressors operate the preset frequency ranges and preset reference opening degrees corresponding to the same outdoor environment temperature preset range, and the first throttle device corresponds to one of the different preset reference opening degrees and takes the corresponding preset reference opening degree as an adjustment reference.
Preferably, the first and second electrodes are formed of a metal,
during refrigerating 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; 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; and/or the proportion of the opening degree of the first throttling device to the opening degree of the second throttling device is different when the dual-temperature air-conditioning system is in heating operation or cooling operation.
Preferably, the first and second electrodes are formed of a metal,
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;
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.
The invention also provides a control method suitable for the dual-temperature air conditioning system, which comprises the following steps:
a detection step, detecting outdoor environment temperature, compressor operation frequency and first exhaust temperature;
an opening reference determining step of obtaining a preset reference opening corresponding to at least one of the outdoor environment temperature and the compressor operation frequency according to the obtained outdoor environment temperature and the compressor operation frequency;
a comparison step, comparing the first exhaust temperature with a preset first exhaust temperature threshold value to obtain a first difference value;
and an opening degree adjusting step of adjusting the opening degrees of the first throttling device and the second throttling device respectively, wherein the opening degree adjusting quantity of the first throttling device is positively correlated with the first difference value and is adjusted by taking a determined preset reference as a reference, and the opening degree adjusting quantity of the second throttling device is in a constant proportion with the opening degree adjusting quantity determined by the first throttling device.
Preferably, the first and second electrodes are formed of a metal,
when the preset throttle device opening table comprises adjustment upper limits and adjustment lower limits corresponding to a plurality of different preset reference openings, controlling the first throttle device to adjust between the adjustment upper limit and the adjustment lower limit corresponding to the corresponding preset reference opening; and/or the presence of a gas in the gas,
when a plurality of different compressors operate within a preset frequency range and a preset reference opening degree correspond to the same preset range of outdoor environment temperature, the opening degree reference determining step further comprises the steps of firstly obtaining the preset range of outdoor environment temperature corresponding to the outdoor environment temperature, and then determining the preset reference opening degree corresponding to the compressor operating frequency range corresponding to the corresponding preset range of outdoor environment temperature.
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, wherein compressors of at least two independent cylinders respectively form the dual-temperature air conditioning system with two evaporation temperatures or condensation temperatures with a first indoor heat exchanger, a second indoor heat exchanger, an outdoor heat exchanger, a first throttling device, a second throttling device and corresponding pipelines which respectively correspond to the first throttling device, the second throttling device and the corresponding pipelines, the stable control of the two throttling devices in the dual-temperature air conditioning system can be effectively realized by independently controlling the first throttling device and the second throttling device, corresponding control strategies are mutually associated with a preset throttling device opening table and a first difference value, the opening degree of the second throttling device is adjusted in a constant proportion to the opening degree of the first throttling device, the condition that the stable control cannot be caused due to the mutual influence and coupling of the opening degrees between the two throttling devices in the actual system control is prevented, the stable, reliable and efficient operation of the dual-temperature air conditioning system is ensured, and meanwhile, the control logic of the dual-temperature air conditioning system is further simplified by adjusting the opening degree of the second throttling device to be in a constant proportion with the opening degree of the first throttling device.
Drawings
FIG. 1 is a system diagram of a dual temperature air conditioning system according to one embodiment of the present invention;
FIG. 2 is a system diagram of a dual temperature air conditioning system according to another embodiment of the present invention;
FIG. 3 is a system diagram of a dual temperature air conditioning system according to yet another embodiment of the present invention;
FIG. 4 is a block diagram of a double suction double row compressor in accordance with one embodiment of the present invention;
fig. 5 is a system diagram of a dual temperature air conditioning system according to still another 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
Referring to fig. 1 to 5 in combination, the present invention provides a dual temperature air conditioning system, including: the air conditioner comprises a compressor 1, an outdoor heat exchanger 3 (and an outdoor fan 9 corresponding to the outdoor heat exchanger), 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 can be communicated to the first exhaust port 103 and the second exhaust port 104 at the same time, 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, for example, when the system shown in fig. 1 is in a cooling condition; 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, for example, when the system shown in fig. 1 is in a heating condition; 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 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 the third pipeline 14, and a second throttling device 42 is arranged on the second pipeline 13; the opening degree of the first throttle device 41 corresponds to one of a plurality of preset reference opening degrees in a preset throttle device opening degree table, and can be adjusted based on a first difference between the first exhaust temperature of the first exhaust port 103 and a preset first exhaust temperature threshold value by using the determined preset reference opening degree as a reference; the ratio between the opening degree of the second throttle device 42 and the opening degree of the first throttle device 41 is constant. In the technical scheme, the compressors of at least two independent cylinders respectively form a double-temperature air conditioning system with two evaporation temperatures or condensation temperatures with the first indoor heat exchanger 51, the second indoor heat exchanger 52, the outdoor heat exchanger 3, the corresponding first throttling device 41, the second throttling device 42 and the corresponding pipelines, the stable control of the two throttling devices in the double-temperature air conditioning system can be effectively realized by independently controlling the first throttling device 41 and the second throttling device 42, the corresponding control strategy is mutually associated with a preset throttling device opening table and a first difference value, the opening degree of the second throttling device 42 is adjusted in a constant proportion to the opening degree of the first throttling device 41, the situation that the two throttling devices in the double-temperature air conditioning system cannot be stably controlled due to mutual influence of the opening degrees between the two throttling devices in actual system control is prevented, and the situation that the double-temperature air conditioning system cannot be stably controlled due to mutual coupling is ensured, The reliable and efficient operation while at the same time adjusting the opening degree of the second throttle device 42 in constant proportion to the opening degree of the first throttle device 41 further simplifies the control logic of the dual temperature air conditioning system. It is understood that the aforementioned preset first exhaust temperature threshold is determined according to the compressor running frequency, the outdoor heat exchanger temperature and the real-time detection value of the first indoor heat exchanger temperature, and the specific calculation method is the conventional technology in the art, and the invention is not intended to improve the method, but only the first exhaust temperature threshold is determined by the corresponding method in the prior art.
Preferably, the adjustment amount of the opening degree adjustment of the first throttle device 41 is positively correlated with the first difference. Specifically, the larger the first difference value is, the larger the respective opening degree adjustment amounts of the corresponding first and second throttling devices 41 and 42 are, and conversely, the smaller the first difference value is, the smaller the respective opening degree adjustment amounts of the corresponding first and second throttling devices 41 and 42 are, and since the second throttling device 42 and the first throttling device 41 are in a constant ratio, the opening degree adjustment tendency thereof is consistent with the opening degree adjustment tendency of the first throttling device 41.
As a specific implementation manner of the preset throttle device opening table, preferably, the preset throttle device opening table includes a plurality of preset ranges of outdoor environment temperatures and preset ranges of compressor operation frequencies, different preset reference openings respectively correspond to different preset ranges of outdoor environment temperatures and different preset ranges of compressor operation frequencies, and the first throttle device 41 corresponds to one of the plurality of different preset reference openings and uses the corresponding preset reference opening as an adjustment reference.
Further, the preset throttle device opening degree table further includes an upper adjustment limit and a lower adjustment limit corresponding to a plurality of different preset reference opening degrees, and the first throttle device 41 is adjusted between the upper adjustment limit and the lower adjustment limit corresponding to the corresponding preset reference opening degree.
Preferably, the frequency range is preset in the operation of a plurality of different compressors, the preset reference opening corresponds to the same preset range of the outdoor environment temperature, at this time, the dual-temperature air conditioning system can firstly determine the outdoor environment temperature corresponding to real-time detection in the aspect of opening adjustment of the throttling device, then the corresponding preset range of the operation frequency of the compressor can be determined more quickly and efficiently, and then the corresponding preset reference opening can be locked more quickly and efficiently, so that logical confusion in the determination of the preset reference opening is prevented, and the control is more efficient.
As a concrete expression of the preset throttle device schedule, the following table shows:
taking the opening degree adjustment of the first throttle apparatus as an example based on the expression shown in the above table, when the detected outdoor ambient temperature is 31 ℃, at this time, the detected compressor operation frequency is 44Hz, at this time, according to the setting rule of the preset reference opening degree of the throttle apparatus of the present invention, the opening degree adjustment reference of the first throttle apparatus is correspondingly determined — the preset reference opening degree is 130, and further, when the first difference between the detected real-time exhaust temperature of the first exhaust port and the first exhaust temperature threshold value is +3 ℃, the opening degree of the first throttle apparatus is increased toward the upper opening degree limit direction based on the adjustment reference of the opening degree of 130; when the first difference is +2 ℃, the adjusting direction of the opening degree is the same as that when the first difference is +3 ℃, but the adjusting amount is smaller; on the contrary, when the first difference is-3 ℃, the opening degree of the first throttling device 41 is decreased towards the direction of the lower limit of the opening degree by taking the adjustment reference of 130 as the opening degree, and the opening degree adjustment of the second throttling device 42 is based on the specific value of the constant proportion K, for example, the value of K is 0-100%, and the specific value is, for example, 58%, that is, the opening degree adjustment amount of the second throttling device is 58% of the opening degree adjustment amount of the first throttling device 41, and further, the opening degree of the first throttling device 41 and the opening degree proportion of the second throttling device 42 are different in the heating operation or the cooling operation of the dual-temperature air conditioning system.
In order to ensure the smooth switching between the cooling working condition and the heating working condition of the dual-temperature air conditioning system, preferably, the outdoor heat exchanger 3 is communicated to the first exhaust port 103 and the second exhaust port 104 at the same time, the first indoor heat exchanger 51 is communicated to the first air inlet 101, and the second indoor heat exchanger 52 is communicated to the second air inlet 102, so as to ensure that the dual-temperature air conditioning system has the cooling working condition; the outdoor heat exchanger 3 is communicated to the first air inlet 101 and the second air inlet 102 at the same time, the first indoor heat exchanger 51 is communicated to the first exhaust port 103, and the second indoor heat exchanger 52 is communicated to the second exhaust port 104, so as to ensure that the dual-temperature air conditioning system has a heating working condition. Specifically, for example, 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 101, the first exhaust port 103, 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 102, the second exhaust port 104, the outdoor heat exchanger 3 and the second indoor heat exchanger 52.
First cylinder and second cylinder are preferred through the parallel connection mode of same pivot drive, the first gas vent 103 of first cylinder with compressor 1's casing inner chamber intercommunication, and the casing inner chamber of compressor then realizes the fluid separation effect of first gas vent 103, and to the second gas vent 104 of second cylinder then can design solitary oil return device best, oil return device sets up second gas vent 104 department, in order to can with oil among the second gas vent combustion gas flows back extremely compressor 1's inner chamber bottom. In order to ensure the energy efficiency utilization rate of the first indoor heat exchanger 51 and the second indoor heat exchanger 52, preferably, the volume ratio of the first cylinder to the second cylinder is 0.2 to 2.5, so that the reasonable distribution of the flow rates of the refrigerant in the first indoor heat exchanger 51 and the second indoor heat exchanger 52 can be ensured, and the efficiency of the dual-temperature air conditioning system is improved more obviously.
As shown in fig. 1, the oil return device includes an oil separator 6 and an oil return assembly, the second exhaust port 104 is communicated with the oil separator 6 through an exhaust pipe, the bottom of the oil separator 6 is communicated to an oil return port 105 of the compressor 1 through an oil return pipe to return oil separated by the oil separator 6 to the bottom of the inner cavity of the compressor 1, the oil return assembly includes a first oil return control valve 7 arranged on the oil return pipe, in the technical scheme, the opening and closing of an oil return passage can be effectively controlled through the arrangement of the first oil return control valve 7 and the oil return pipe, and an effective oil return effect can be performed when oil return is required; alternatively, as shown in fig. 2, the oil return device includes an oil separator 6 and an oil return assembly, the second exhaust port 104 communicates with the oil separator 6 through an exhaust line, 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, 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, an oil return capillary tube 11 is arranged on the parallel pipeline, in the technical scheme, the opening and closing of the oil return passage can be effectively controlled through the arrangement of the second oil return control valve 10 and the oil return pipeline, effective oil return effect (large flow) can be carried out when needs carry out the oil return, can also carry out the oil return effect (small flow) that has the throttle degree through oil return capillary 11 when second oil return control valve 10 closes, can effectively guarantee that the oil return process lasts effectual going on.
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; or, the indoor fan 8 is disposed at one side of the first indoor heat exchanger 51, so that the airflow sequentially flows through the second indoor heat exchanger 52, the first indoor heat exchanger 51 and the indoor fan 8, in the technical scheme, the two indoor heat exchangers are overlapped in the flowing direction of the airflow, and one indoor fan performs a heat exchange effect on the two indoor heat exchangers, so that effective integration of the heat exchangers is realized, the structure is compact, the airflow step cooling effect can be realized, the heat exchange temperature difference is reduced, and the energy efficiency level of the system is improved.
According to an embodiment of the present invention, there is also provided a control method for the dual-temperature air conditioning system, including:
detecting outdoor environment temperature, compressor operation frequency and first exhaust temperature at first time, wherein the first time can be understood as any time point, namely the outdoor environment temperature, the compressor operation frequency and the first exhaust temperature are detected and obtained at the same time, so as to ensure that the reference of subsequent processing steps is uniform;
an opening reference determining step of obtaining a preset reference opening corresponding to at least one of the outdoor environment temperature and the compressor operation frequency according to the obtained outdoor environment temperature and the compressor operation frequency;
a comparison step, comparing the first exhaust temperature with a preset first exhaust temperature threshold value to obtain a first difference value;
and an opening degree adjusting step of adjusting the opening degrees of the first throttle device 41 and the second throttle device 42, respectively, wherein the opening degree adjustment amount of the first throttle device 41 is positively correlated with the first difference value and is adjusted based on a predetermined reference opening degree, and the opening degree adjustment amount of the second throttle device 42 is in a constant proportion to the opening degree adjustment amount determined by the first throttle device 41.
Preferably, when the preset throttle device opening table includes adjustment upper limits and adjustment lower limits corresponding to a plurality of different preset reference openings, the first throttle device 41 is controlled to adjust between the adjustment upper limit and the adjustment lower limit corresponding to the corresponding preset reference opening; and/or the presence of a gas in the gas,
when a plurality of different compressors operate within a preset frequency range and a preset reference opening degree correspond to the same preset range of outdoor environment temperature, the opening degree reference determining step further comprises the steps of firstly obtaining the preset range of outdoor environment temperature corresponding to the outdoor environment temperature, and then determining the preset reference opening degree corresponding to the compressor operating frequency range corresponding to the corresponding preset range of outdoor environment temperature.
The invention also provides an air conditioner which comprises the dual-temperature air conditioning system.
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, comprising:
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 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) corresponds to one of a plurality of preset reference opening degrees in a preset throttling device opening degree table, and can be adjusted by taking the determined preset reference opening degree as a reference according to a first difference value between the first exhaust temperature of the first exhaust port (103) and a preset first exhaust temperature threshold value; the ratio of the opening degree of the second throttling device (42) to the opening degree of the first throttling device (41) is constant.
2. Dual temperature air conditioning system according to claim 1,
the adjustment amount of the opening degree adjustment of the first throttle device (41) is positively correlated with the first difference.
3. Dual temperature air conditioning system according to claim 2,
the preset throttle device opening degree table comprises a plurality of outdoor environment temperature preset ranges and compressor operation frequency preset ranges, different preset reference opening degrees respectively correspond to different outdoor environment temperature preset ranges and different compressor operation frequency preset ranges, and the first throttle device (41) corresponds to one of the different preset reference opening degrees and takes the corresponding preset reference opening degree as an adjustment reference.
4. A dual temperature air conditioning system as set forth in claim 3,
the preset throttle device opening degree table further comprises an upper adjustment limit and a lower adjustment limit corresponding to a plurality of different preset reference opening degrees, and the first throttle device (41) is adjusted between the upper adjustment limit and the lower adjustment limit corresponding to the corresponding preset reference opening degree.
5. Dual temperature air conditioning system according to claim 2,
the preset throttle device opening degree table comprises a plurality of outdoor environment temperature preset ranges and compressor operation frequency preset ranges, a plurality of different compressors operate the preset frequency ranges and preset reference opening degrees corresponding to the same outdoor environment temperature preset range, and the first throttle device (41) corresponds to one of the different preset reference opening degrees and takes the corresponding preset reference opening degree as an adjustment reference.
6. Dual temperature air conditioning system according to any of claims 1 to 5,
during cooling operation, the outdoor heat exchanger (3) is communicated with the first exhaust port (103) and the second exhaust port (104) at the same time, the first indoor heat exchanger (51) is communicated with the first suction port (101), and the second indoor heat exchanger (52) is communicated with the second suction port (102); in heating operation, the outdoor heat exchanger (3) is communicated to the first suction port (101) and the second suction port (102) at the same time, the first indoor heat exchanger (51) is communicated to the first exhaust port (103), and the second indoor heat exchanger (52) is communicated to the second exhaust port (104); and/or the opening ratio of the first throttling device (41) to the second throttling device (42) is different when the dual-temperature air conditioning system is in heating operation or cooling operation.
7. A dual temperature air conditioning system as set forth in claim 6, wherein:
the oil return device is arranged at the second exhaust port (104) and can return oil in the gas exhausted by the second exhaust port 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 (104) 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 (104) 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.
8. A control method adapted to the dual temperature air conditioning system of any one of claims 1 to 7, comprising:
a detection step, detecting outdoor environment temperature, compressor operation frequency and first exhaust temperature;
an opening reference determining step of obtaining a preset reference opening corresponding to at least one of the outdoor environment temperature and the compressor operation frequency according to the obtained outdoor environment temperature and the compressor operation frequency;
a comparison step, comparing the first exhaust temperature with a preset first exhaust temperature threshold value to obtain a first difference value;
and an opening degree adjusting step of adjusting the opening degrees of the first throttle device (41) and the second throttle device (42), respectively, wherein the opening degree adjustment amount of the first throttle device (41) is positively correlated with the first difference value and is adjusted by taking the determined preset reference opening degree as a reference, and the opening degree adjustment amount of the second throttle device (42) is in a constant proportion to the opening degree adjustment amount determined by the first throttle device (41).
9. The control method according to claim 8,
when the preset throttle device opening table comprises an upper adjustment limit and a lower adjustment limit corresponding to a plurality of different preset reference openings, controlling the first throttle device (41) to adjust between the upper adjustment limit and the lower adjustment limit corresponding to the corresponding preset reference openings; and/or the presence of a gas in the gas,
when a plurality of different compressors operate within a preset frequency range and a preset reference opening degree correspond to the same preset range of outdoor environment temperature, the opening degree reference determining step further comprises the steps of firstly obtaining the preset range of outdoor environment temperature corresponding to the outdoor environment temperature, and then determining the preset reference opening degree corresponding to the compressor operating frequency range corresponding to the corresponding preset range of outdoor environment temperature.
10. An air conditioner characterized by comprising the dual temperature air conditioning system of any one of claims 1 to 7.
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