CN111609582B - 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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- CN111609582B CN111609582B CN202010331269.3A CN202010331269A CN111609582B CN 111609582 B CN111609582 B CN 111609582B CN 202010331269 A CN202010331269 A CN 202010331269A CN 111609582 B CN111609582 B CN 111609582B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 62
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- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 17
- 230000009977 dual effect Effects 0.000 claims description 16
- 230000002596 correlated effect Effects 0.000 claims description 8
- 238000005057 refrigeration Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 230000000875 corresponding effect Effects 0.000 description 11
- 239000007789 gas Substances 0.000 description 10
- 239000002184 metal Substances 0.000 description 7
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- General Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
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- Mathematical Physics (AREA)
- 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 opening degree of the second throttling device is adjusted according to the difference value between the corresponding temperature of the indoor heat exchanger and the preset temperature of the indoor heat exchanger, and the opening degree of the first throttling device and the opening degree of the second throttling device are in 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 first indoor heat exchanger and the second indoor heat exchanger are respectively positioned at the upstream and the downstream of the circulating airflow in the flowing direction of the circulating airflow;
the opening degree of the second throttling device can be adjusted according to the difference value between the temperature of the second indoor heat exchanger and the preset temperature of the second indoor heat exchanger; the ratio of the opening degree of the first throttling device to the opening degree of the second 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 second throttle device is positively correlated with the difference.
Preferably, the first and second electrodes are formed of a metal,
when the dual-temperature air conditioning system operates in a refrigerating mode, the temperature of the preset second indoor heat exchanger is determined according to the indoor environment temperature and the indoor relative humidity; and/or when the dual-temperature air conditioning system is used for heating, the preset temperature of the second indoor heat exchanger is determined according to the indoor environment temperature and the compressor operation frequency.
Preferably, when the dual-temperature air conditioning system operates in a refrigerating mode, the preset temperature of the second indoor heat exchanger is determined according to the temperature of the first indoor heat exchanger and the indoor relative humidity; and/or when the dual-temperature air conditioning system is in heating operation, the preset temperature of the second indoor heat exchanger is determined according to the temperature of the first indoor heat exchanger and the operation frequency of the compressor.
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; when the air conditioner works for heating, 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.
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; or,
the oil return device comprises an oil separator and an oil return assembly, the second exhaust port is communicated with the oil separator through an exhaust pipeline, the bottom of the oil separator is communicated to the bottom of an inner cavity of the compressor through an oil return pipeline, the oil return assembly comprises a second oil return control valve arranged on the oil return pipeline and a parallel pipeline connected with the second oil return control valve in parallel, and an oil return capillary is arranged on the parallel pipeline.
Preferably, the first and second electrodes are formed of a metal,
the opening ratio of the first throttling device to the second throttling device is different when the dual-temperature air conditioning system is in heating operation or cooling operation.
The invention also provides a control method suitable for the dual-temperature air conditioning system, which comprises the following steps:
detecting the indoor environment temperature, the indoor relative humidity, the compressor running frequency and the second indoor heat exchanger temperature;
acquiring an operation mode of a dual-temperature air conditioning system;
acquiring a preset temperature of the second indoor heat exchanger according to the acquired operation mode;
comparing the obtained temperature of the second indoor heat exchanger with the preset temperature of the second indoor heat exchanger to obtain a difference value;
and respectively adjusting the opening degrees of the first throttling device and the second throttling device, wherein the opening degree adjustment quantity of the second throttling device is positively correlated with the difference value, and the opening degree adjustment quantity of the first throttling device is in a constant proportion with the opening degree adjustment quantity determined by the second throttling device.
Preferably, the first and second electrodes are formed of a metal,
the operation modes comprise a cooling mode and a heating mode;
when the operation mode is a refrigeration mode, the preset temperature of the second indoor heat exchanger is determined according to the acquired indoor environment temperature and the acquired indoor relative humidity; and/or when the operation mode is the heating mode, the preset temperature of the second indoor heat exchanger is determined according to the acquired indoor environment temperature and the compressor operation frequency.
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.A compressor of at least two independent cylinders respectively forms 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 and the second throttling device, the first throttling device and the second throttling device are independently controlled, and the difference between the corresponding control strategy and the preset temperature of the indoor heat exchanger is correlated to each other, so that the stable control of the two throttling devices in the dual-temperature air conditioning system can be effectively realized, the condition that the opening degrees of the two throttling devices in the actual system control are mutually influenced to generate coupling to cause unstable control is 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 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 first indoor heat exchanger 51 and the second indoor heat exchanger 52 are respectively located upstream and downstream of the ventilation air flow in the flow direction of the ventilation air flow; the opening degree of the second throttling device 42 can be adjusted according to the difference value between the second indoor heat exchanger temperature of the second indoor heat exchanger 52 and the preset second indoor heat exchanger temperature; the ratio between the opening degree of the first throttle device 41 and the opening degree of the second throttle device 42 is constant. In the technical scheme, the compressors of at least two independent cylinders respectively form a dual-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 dual-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 correlated with the difference value between the preset indoor heat exchanger temperatures, and the opening degree of the first throttling device 41 and the opening degree of the second throttling device 42 are adjusted in a constant proportion, so that the situation that the two throttling devices in the dual-temperature air conditioning system cannot be stably controlled due to the fact that the opening degrees of the two throttling devices in actual system control are mutually influenced and coupled is prevented from occurring, and the dual-temperature air conditioning system is ensured to be stable, Operates reliably and efficiently.
Preferably, the adjustment amount of the opening degree adjustment of the second throttle device 42 is positively correlated with the difference. Specifically, the larger the difference is, the larger the corresponding opening degree adjustment amount of the corresponding second throttle device 42 is, and conversely, the smaller the difference is, the smaller the corresponding opening degree adjustment amount of the corresponding second throttle device 42 is. Further, whether the opening degree adjustment amount is adjusted in a direction toward a larger direction or in a direction toward a smaller direction depends on an operation mode of the dual-temperature air conditioning system, for example, when the dual-temperature air conditioning system performs cooling operation, if the difference is greater than 0, it indicates that the temperature of the second indoor heat exchanger 52 is higher, at this time, the opening degree adjustment amount should be adjusted in the direction toward the smaller direction, and if the difference is larger, the opening degree adjustment amount is also larger, so that the temperature of the second indoor heat exchanger 52 can more rapidly approach the preset second indoor heat exchanger temperature until the preset second indoor heat exchanger temperature is the same, that is, the difference is 0, otherwise, if the difference is less than 0, it indicates that the temperature of the second indoor heat exchanger 52 is lower, at this time, the opening degree adjustment amount should be adjusted in a direction toward a larger direction, and if the difference is larger, so that the temperature of the second indoor heat exchanger 52 can more rapidly approach the preset second indoor heat exchanger temperature The temperature of the heat exchanger is the same; for the dual-temperature air conditioning system to operate for heating, the opening adjustment principle of the throttling device is the same as that for refrigerating, and the details are not repeated here.
It is understood that the aforementioned predetermined second indoor heat exchanger temperature may be determined according to a plurality of common detection values of the compressor operation frequency, the indoor environment temperature, the indoor relative humidity and the like, and a specific calculation or obtaining method (such as experimental statistics) is a conventional technology in the field, and the present invention is not intended to improve the determination method, and preferably, the predetermined second indoor heat exchanger temperature is determined according to the indoor environment temperature and the indoor relative humidity when the dual-temperature air conditioning system is in a cooling operation; and/or when the dual-temperature air conditioning system is used for heating, the preset temperature of the second indoor heat exchanger is determined according to the indoor environment temperature and the compressor operation frequency. The possibility that condensation can be generated in the cooling mode and the possibility that condensation cannot be generated in the heating mode is fully considered, so that when the system is in cooling operation, the indoor environment temperature and the indoor relative humidity are selected as the preset acquisition basis parameters of the temperature of the second indoor heat exchanger, and the probability of condensation is effectively avoided. Further, at the same detection time, the lowest value of the preset temperature of the first indoor heat exchanger is higher than the highest value of the preset temperature of the second indoor heat exchanger, so that the gradient of the temperature is reduced when circulating airflow sequentially flows through the first indoor heat exchanger 51 and the second indoor heat exchanger 52, and the energy efficiency of the air conditioning system is improved.
Specifically, a specific example of determining the preset second indoor heat exchanger temperature in the cooling mode is given in the following table, and it can be seen in the table that both the indoor ambient temperature and the indoor relative humidity determine the preset second indoor heat exchanger temperature at a certain detection time, for example, when the indoor ambient temperature is 25 ℃ and the indoor relative humidity is 61%, the preset second indoor heat exchanger temperature at this time corresponds to 17 ℃, but it can be understood that the parameter range in the following table is only used as a specific example of the technical solution of the present application, and it does not unduly limit the protection range structure of the technical solution of the present invention, and also does not give a complete example of various states.
The following table gives a specific example of the determination of the preset second indoor heat exchanger temperature in the heating mode, and it can be seen from the table that the indoor ambient temperature, the compressor operating frequency and the damper level jointly determine the preset second indoor heat exchanger temperature at a certain detection time (the damper level may also be disregarded, but is preferably disregarded to ensure a more accurate corresponding acquisition of the preset temperature), specifically for example, when the indoor environment temperature is 17 ℃, the compressor running frequency is 19Hz, and the windshield grade is a high windshield, the preset temperature of the second indoor heat exchanger is 33 ℃, it should be understood, however, that the ranges of the parameters in the following table are only given as a specific example of the technical solution of the present application, it does not limit the scope of the technical solution of the present invention, nor does it give a complete example of the various states. The opening degree of the first throttling device 41 is adjusted according to a specific value of the constant ratio K, for example, the value K is 0 to 100%, and a specific value is, for example, 58%, that is, the opening degree adjustment amount of the first throttling device 41 is 58% of the opening degree adjustment amount of the second throttling device 42, and preferably, the opening degree of the second throttling device 42 is different from the opening degree ratio of the first throttling device 41 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 the indoor environment temperature, the indoor relative humidity, the compressor running frequency and the second indoor heat exchanger temperature;
acquiring an operation mode of a dual-temperature air conditioning system;
acquiring a preset temperature of the second indoor heat exchanger according to the acquired operation mode;
comparing the obtained temperature of the second indoor heat exchanger with the preset temperature of the second indoor heat exchanger to obtain a difference value;
the opening degrees of the first throttle device 41 and the second throttle device 42 are respectively adjusted, the opening degree adjustment amount of the second throttle device 42 is positively correlated with the difference, and the opening degree adjustment amount of the first throttle device 41 and the opening degree adjustment amount determined by the second throttle device 42 are in a constant proportion.
Preferably, the first and second electrodes are formed of a metal,
the operation modes comprise a cooling mode and a heating mode; when the operation mode is a refrigeration mode, the preset temperature of the second indoor heat exchanger is determined according to the acquired indoor environment temperature and the acquired indoor relative humidity; and/or when the operation mode is the heating mode, the preset temperature of the second indoor heat exchanger is determined according to the acquired indoor environment temperature and the compressor operation frequency.
According to an embodiment of the invention, an air conditioner is also provided, 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 (9)
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 first indoor heat exchanger (51) and the second indoor heat exchanger (52) are respectively positioned at the upstream and the downstream of the circulating airflow in the flowing direction of the circulating airflow;
the opening degree of the second throttling device (42) can be adjusted according to the difference value between the temperature of the second indoor heat exchanger (52) and the preset temperature of the second indoor heat exchanger; the ratio between the opening degree of the first throttling device (41) and the opening degree of the second throttling device (42) is constant.
2. Dual temperature air conditioning system according to claim 1,
the adjustment amount of the opening degree adjustment of the second throttle device (42) is positively correlated with the difference.
3. Dual temperature air conditioning system according to claim 1,
when the dual-temperature air conditioning system operates in a refrigerating mode, the temperature of the preset second indoor heat exchanger is determined according to the indoor environment temperature and the indoor relative humidity; and/or when the dual-temperature air conditioning system is used for heating, the preset temperature of the second indoor heat exchanger is determined according to the indoor environment temperature and the compressor operation frequency.
4. Dual temperature air conditioning system according to any of claims 1 to 3,
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); when the air conditioner is operated for heating, the outdoor heat exchanger (3) is communicated to the first air suction port (101) and the second air 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).
5. A dual temperature air conditioning system as set forth in claim 4, 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; or,
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.
6. A dual temperature air conditioning system according to claim 1, wherein the ratio of the opening degree of the first throttling means (41) to the opening degree of the second throttling means (42) is different in the heating operation or the cooling operation of the dual temperature air conditioning system.
7. A control method suitable for the dual temperature air conditioning system of any one of claims 1 to 5, comprising:
detecting the indoor environment temperature, the indoor relative humidity, the compressor running frequency and the second indoor heat exchanger temperature;
acquiring an operation mode of a dual-temperature air conditioning system;
acquiring a preset temperature of the second indoor heat exchanger according to the acquired operation mode;
comparing the obtained temperature of the second indoor heat exchanger with the preset temperature of the second indoor heat exchanger to obtain a difference value;
the opening degrees of the first throttling device (41) and the second throttling device (42) are respectively adjusted, the opening degree adjusting amount of the second throttling device (42) is positively correlated with the difference value, and the opening degree adjusting amount of the first throttling device (41) and the opening degree adjusting amount determined by the second throttling device (42) are in a constant proportion.
8. The control method according to claim 7,
the operation modes comprise a cooling mode and a heating mode;
when the operation mode is a refrigeration mode, the preset temperature of the second indoor heat exchanger is determined according to the acquired indoor environment temperature and the acquired indoor relative humidity; and/or when the operation mode is the heating mode, the preset temperature of the second indoor heat exchanger is determined according to the acquired indoor environment temperature and the compressor operation frequency.
9. An air conditioner characterized by comprising the dual temperature air conditioning system of any one of claims 1 to 6.
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| CN202010331269.3A CN111609582B (en) | 2020-04-24 | 2020-04-24 | Dual-temperature air conditioning system, control method and air conditioner |
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| CN202010331269.3A CN111609582B (en) | 2020-04-24 | 2020-04-24 | Dual-temperature air conditioning system, control method and air conditioner |
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| CN105588359A (en) * | 2015-01-30 | 2016-05-18 | 海信（山东）空调有限公司 | Air conditioning system |
| CN106352585B (en) * | 2016-09-29 | 2019-01-08 | 广东美的制冷设备有限公司 | Air-conditioning system and its control method |
| CN108180680B (en) * | 2018-01-22 | 2023-08-22 | 珠海格力电器股份有限公司 | Oil return control device, air conditioning system and oil return control method thereof |
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