CN113776142A - Heat pump type air conditioner refrigeration cycle system and control method thereof - Google Patents
Heat pump type air conditioner refrigeration cycle system and control method thereof Download PDFInfo
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- CN113776142A CN113776142A CN202111058199.XA CN202111058199A CN113776142A CN 113776142 A CN113776142 A CN 113776142A CN 202111058199 A CN202111058199 A CN 202111058199A CN 113776142 A CN113776142 A CN 113776142A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 40
- 238000010257 thawing Methods 0.000 claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 239000003507 refrigerant Substances 0.000 claims abstract description 35
- 230000000694 effects Effects 0.000 claims description 15
- 230000005494 condensation Effects 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 5
- 238000004781 supercooling Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 8
- 238000004378 air conditioning Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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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
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/02—Subcoolers
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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
- F25B41/00—Fluid-circulation arrangements
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The system comprises an indoor side heat exchanger and an outdoor side heat exchanger, a flash evaporator and a subcooler are further arranged on the outdoor side, a gas outlet end of the flash evaporator is sequentially connected with the subcooler and the outdoor side heat exchanger, a liquid outlet end of the flash evaporator is further respectively connected with the indoor side heat exchanger and the outdoor side heat exchanger, the indoor side heat exchanger and the outdoor side heat exchanger are connected onto a liquid storage device circulation pipeline through a four-way reversing valve, and a liquid storage device and a compressor are arranged on the liquid storage device circulation pipeline. The control method is respectively and correspondingly controlled according to whether the system is in a refrigeration mode, a heating mode or a defrosting mode. The invention can effectively improve the energy efficiency of the refrigeration cycle system of the heat pump type air conditioner, inhibit or slow down the frosting of the outdoor side heat exchanger in the heating mode, and simultaneously realize the supercooling of the high-pressure side liquid refrigerant in the refrigeration mode, thereby improving the refrigerating capacity of the system.
Description
Technical Field
The invention belongs to the technical field of refrigeration air conditioners, and particularly relates to a heat pump type air conditioner refrigeration cycle system and a control method thereof.
Background
The heat pump type air conditioner is energy-saving and environment-friendly heating and cooling equipment, and is a device which consumes electric energy to enable heat to flow from a low-temperature heat source to a high-temperature heat source. The heat pump type air conditioner consumes a certain amount of electric energy, but the supplied heat is the sum of the consumed electric energy and the drawn low-temperature heat. Therefore, the heat pump type air conditioner can achieve the purpose of energy saving. However, when the heat pump type air conditioner heats in winter, the outdoor air temperature is low, the evaporation temperature of the heat pump type air conditioning system is too low, and when the evaporation temperature is lower than the freezing point temperature, outdoor air is easy to frost on the surface of the evaporator. The frosting not only increases the resistance of air flowing through the outdoor heat exchanger and reduces the air flow so as to reduce the heat supply performance of the unit, but also increases the heat transfer resistance between the outdoor air and the refrigerant, reduces the heat exchange effect, leads to obvious attenuation of the heating capacity of the system and rapid reduction of the energy efficiency of the system, even causes the shutdown of the compressor in severe cases, and leads to the abnormal work of the system. Therefore, the heat pump type air conditioner requires timely defrosting. The most widely applied reverse cycle defrosting method at present has the problems of influence on indoor thermal comfort, long defrosting time and the like. The problem of frosting and defrosting of the heat pump type air conditioning system in the heating mode in winter becomes a bottleneck for restricting the efficient operation of the heat pump type air conditioning system, how to effectively inhibit or delay the frosting of the heat pump type air conditioning system and efficiently and quickly realize the defrosting of an outdoor heat exchanger, and the key problem of whether the heat pump type air conditioning system can be operated more widely and efficiently is the problem of reducing the adverse effect on a unit and an indoor environment caused by the frosting and defrosting processes.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a refrigeration cycle system of a heat pump type air conditioner and a control method thereof, which can suppress or reduce the frost formation of an outdoor heat exchanger in a heating mode and increase the cooling capacity.
In order to achieve the purpose, the invention has the following technical scheme:
the utility model provides a heat pump type air conditioner refrigeration cycle system, includes indoor side heat exchanger and outdoor side heat exchanger, and the outdoor side still is provided with flash vessel and subcooler, and the gas outlet end of flash vessel links to each other with subcooler and outdoor side heat exchanger in proper order, the liquid outlet end of flash vessel still links to each other with indoor side heat exchanger and outdoor side heat exchanger respectively, indoor side heat exchanger and outdoor side heat exchanger pass through the four-way reversing valve and connect on reservoir circulating line, be provided with reservoir and compressor on the reservoir circulating line.
As a preferable aspect of the present invention, a first electronic expansion valve is disposed in a pipeline between the liquid outlet end of the flash evaporator and the indoor-side heat exchanger, a second electronic expansion valve is disposed in a pipeline between the subcooler and the outdoor-side heat exchanger, and a third electronic expansion valve is disposed in a pipeline between the liquid outlet end of the flash evaporator and the outdoor-side heat exchanger.
As a preferred scheme of the invention, an indoor temperature sensor is also arranged on the indoor side, and a defrosting temperature sensor is also arranged on the outdoor side; the indoor temperature sensor, the defrosting temperature sensor, the first electronic expansion valve, the second electronic expansion valve, the third electronic expansion valve and the compressor are connected with the controller.
As a preferred scheme of the present invention, the heat pump type air conditioner refrigeration cycle system includes three operation modes, which are a heating mode, a cooling mode and a defrosting mode.
As a preferred scheme of the present invention, when the heat pump type air conditioner refrigeration cycle system is in a heating mode, the opening degree is adjusted by the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve to realize the throttling effect of the refrigerant; at the moment, the indoor side heat exchanger is used as a condenser, and the outdoor side heat exchanger is used as an evaporator; high-temperature and high-pressure refrigerant is discharged by a compressor and flows into the indoor side heat exchanger through a four-way reversing valve, the refrigerant is condensed and releases heat in the indoor side heat exchanger to provide heat for the indoor space, then the refrigerant enters the flash evaporator through the first electronic expansion valve, flash steam flashed by the flash evaporator enters the subcooler to realize condensation, and meanwhile, outdoor air is heated; the liquid in the flash evaporator enters the outdoor side heat exchanger after being throttled by the third electronic expansion valve; the refrigerant flowing out of the outdoor heat exchanger flows through the four-way reversing valve and the liquid storage device in sequence and then returns to the compressor.
As a preferable scheme of the present invention, when the heat pump type air conditioner refrigeration cycle system is in the heating mode, the outdoor cold air firstly flows through the subcooler and then flows through the outdoor heat exchanger, the subcooler condenses the flash vapor flowing out of the flash evaporator, and on the other hand, heats the outdoor cold air, so as to increase the air inlet temperature of the outdoor heat exchanger and slow down the frosting on the surface of the outdoor heat exchanger.
As a preferred scheme of the present invention, when the heat pump type air conditioner refrigeration cycle system is in a refrigeration mode, the third electronic expansion valve is closed, the second electronic expansion valve is fully opened, and the first electronic expansion valve adjusts the opening degree to realize the throttling effect of the refrigerant; at the moment, the indoor side heat exchanger is used as an evaporator, and the outdoor side heat exchanger is used as a condenser; the refrigerant with high temperature and high pressure is discharged by the compressor, flows into the outdoor heat exchanger through the four-way reversing valve, then enters the subcooler through the second electronic expansion valve, releases heat for the second time in the subcooler, and then flows into the flash evaporator; and then the refrigerant flows into the indoor side heat exchanger after flowing through the first electronic expansion valve for throttling, and after the indoor side heat exchanger achieves a refrigeration effect, the refrigerant sequentially flows through the four-way reversing valve and the liquid storage device and then returns to the compressor.
As a preferable scheme of the present invention, when the heat pump type air conditioner refrigeration cycle system is in the refrigeration mode, the outdoor cold air firstly flows through the subcooler and then flows through the outdoor side heat exchanger, and the subcooler is used for performing a secondary subcooling effect on the refrigerant.
In a preferred embodiment of the present invention, the four-way reversing valve, the accumulator circulation line, the accumulator and the compressor are disposed outside the chamber.
The invention also provides a control method of the heat pump type air conditioner refrigeration cycle system, which comprises the following steps:
the heat pump type air conditioner refrigeration cycle system judges whether the working mode is in a refrigeration mode, a heating mode or a defrosting mode;
when the refrigeration cycle system of the heat pump type air conditioner is in a refrigeration mode, adjusting the opening degree of pipelines between the liquid outlet end of the flash evaporator and the indoor side heat exchanger and between the subcooler and the outdoor side heat exchanger, and closing the pipelines between the liquid outlet end of the flash evaporator and the outdoor side heat exchanger; when the indoor temperature T1 is detected to be not more than T2, the target temperature set by the refrigeration working condition is reached, wherein T2 is the target temperature set by refrigeration, and at the moment, the compressor stops working;
when the refrigeration cycle system of the heat pump type air conditioner is in a heating mode, adjusting the opening degree of pipelines between the liquid outlet end of the flash evaporator and the indoor side heat exchanger, between the subcooler and the outdoor side heat exchanger and between the liquid outlet end of the flash evaporator and the outdoor side heat exchanger; when the indoor temperature T1 is detected to be more than or equal to T3, the target temperature set by the heating working condition is reached, wherein T3 is the target temperature set by heating, and at the moment, the compressor stops working;
when the refrigeration cycle system of the heat pump type air conditioner is in a defrosting mode, adjusting the opening degree of a pipeline between the liquid outlet end of the flash evaporator and the indoor side heat exchanger, completely opening the pipeline between the subcooler and the outdoor side heat exchanger, and closing the pipeline between the liquid outlet end of the flash evaporator and the outdoor side heat exchanger; when the temperature Tw at the outlet pipe of the subcooler is detected to be more than or equal to T4, the condition of ending defrosting is reached, wherein T4 is the target temperature set for ending defrosting, and at the moment, the compressor stops working; or when the defrosting time t1 is more than or equal to t2, the time upper limit set by the defrosting condition is reached, wherein t2 is the target time set for finishing defrosting, and the compressor stops working at the moment.
Compared with the prior art, the invention has the following beneficial effects: in the refrigeration cycle mode, the arranged flash evaporator plays a role of a high-pressure liquid storage device, secondary supercooling of the refrigerant flowing out of the outdoor heat exchanger is realized by the addition of the subcooler, the supercooling degree of the refrigerant before throttling is improved, and the improvement of the unit mass refrigerating capacity is facilitated. In the heating circulation mode, the flash gas in the flash evaporator is condensed into liquid in the subcooler, and then the liquid and the fluid throttled by the flash evaporator are converged in the outdoor heat exchanger to realize evaporation and heat absorption. The condensation of the flash gas can improve the heat absorption capacity of the system evaporator and increase the heating capacity of the system. In the heating circulation mode, the system utilizes the subcooler to heat the outdoor air, and improves the air inlet temperature of the outdoor heat exchanger, thereby effectively slowing down the frosting on the surface of the outdoor heat exchanger. In the heating circulation mode, the subcooler heats the inlet air of the outdoor heat exchanger, and the evaporation temperature of the system is increased, so that the energy efficiency of the system is improved, and the energy-saving effect is achieved. The invention has obvious characteristics and advantages, can effectively improve the energy efficiency of a refrigeration cycle system of the heat pump type air conditioner, inhibit or slow down the frosting of an outdoor side heat exchanger in the heating mode, can realize the supercooling of a high-pressure side liquid refrigerant in the refrigeration mode and improve the refrigerating capacity of the system aiming at the problems of serious frosting and frequent defrosting of the conventional heat pump type air conditioner in the heating mode in winter.
Drawings
FIG. 1 is a schematic diagram of a heat pump type air conditioner refrigeration cycle system according to the present invention;
FIG. 2 is a flow chart of a method for controlling a refrigeration cycle system of a heat pump type air conditioner according to the present invention;
in the drawings: 101-a reservoir; 102-a compressor; 103-four-way reversing valve; 104-indoor side heat exchanger; 105-a flash evaporator; 106-a first electronic expansion valve; 107-a subcooler; 108-a second electronic expansion valve; 109-a third electronic expansion valve; 110-outdoor side heat exchanger; 111-a controller; 112-indoor temperature sensor; 113-defrost temperature sensor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the embodiment of the present invention provides a heat pump type air conditioner refrigeration cycle system, which includes a liquid reservoir 101, a compressor 102, a four-way reversing valve 103, an indoor side heat exchanger 104, a flash evaporator 105, a first electronic expansion valve 106, a subcooler 107, a second electronic expansion valve 108, a third electronic expansion valve 109, an outdoor side heat exchanger 110, a controller 111, an indoor temperature sensor 112, and a defrosting temperature sensor 113. Wherein, the reservoir 101, the compressor 102, the four-way reversing valve 103, the flash evaporator 105, the subcooler 107, the second electronic expansion valve 108, the third electronic expansion valve 109 and the outdoor heat exchanger 110 are positioned outside the room; and the indoor heat exchanger 104 and the first electronic expansion valve 106 are located at the indoor side. One end of the flash evaporator 105 is connected with the first electronic expansion valve 106, a gas outlet end of the flash evaporator 105 is sequentially connected with the subcooler 107, the second electronic expansion valve 108 and the outdoor heat exchanger 110, and a liquid outlet end of the flash evaporator 105 is sequentially connected with the third electronic expansion valve 109 and the outdoor heat exchanger 110. The compressor 102, the first electronic expansion valve 106, the second electronic expansion valve 108, the third electronic expansion valve 109, the indoor temperature sensor 112, and the defrosting temperature sensor 113 are all connected to a controller 111. The heat pump type air conditioner refrigeration cycle system of the invention comprises three working modes: a heating mode, a cooling mode, and a defrosting mode. The flash evaporator 105 plays a flash evaporation role in the heating circulation mode, and the subcooler 107 plays a role in condensing flash evaporation gas; the flash evaporator 105 plays a role in high-pressure side liquid delivery in the refrigeration cycle mode, and the subcooler 107 plays a role in secondary subcooling; the first electronic expansion valve 106, the second electronic expansion valve 108, and the third electronic expansion valve 109 are controlled to have opening degrees according to the operation mode, and can be fully opened or fully closed.
When the system of the embodiment works, the outdoor air firstly flows through the subcooler 107 and then flows through the outdoor side heat exchanger 110.
The system of the embodiment comprises three working modes: a heating mode, a cooling mode, and a defrosting mode.
When the refrigeration cycle system of the heat pump type air conditioner is in a heating cycle mode, the opening degrees of the first electronic expansion valve 106, the second electronic expansion valve 108 and the third electronic expansion valve 109 are adjusted to realize the throttling effect of the refrigerant. The indoor side heat exchanger 104 serves as a condenser, and the outdoor side heat exchanger 110 serves as an evaporator; high-temperature and high-pressure refrigerant is discharged from a compressor 102, flows into an indoor side heat exchanger 104 through a four-way reversing valve 103, is condensed and releases heat in the indoor side heat exchanger 104 to provide heat indoors, and then enters a flash evaporator 105 through a first electronic expansion valve 106, wherein flashed gas enters a subcooler 107 through a gas outlet of the flash evaporator 105 to realize condensation of the flashed gas, and outdoor air is heated. The liquid in the flash evaporator 105 is throttled by the third electronic expansion valve 109 and enters the outdoor heat exchanger 110. The refrigerant flowing out of the outdoor heat exchanger 110 passes through the four-way selector valve 103 and the accumulator 101 in this order and returns to the compressor 102. In the heating circulation mode, the outdoor cold air firstly flows through the subcooler 107 and then flows through the outdoor heat exchanger 110, at the moment, the heat pump type air conditioner refrigeration circulation system utilizes the subcooler 107 to realize condensation of flash vapor flowing out of the flash evaporator 105 on the one hand, and on the other hand, the subcooler 107 heats the outdoor air, so that the air inlet temperature of the outdoor heat exchanger 110 is increased, the evaporation temperature of the system is increased, and the frosting on the surface of the outdoor heat exchanger 110 is effectively slowed down.
When the heat pump type air conditioner refrigeration cycle system is in the refrigeration cycle mode, the third electronic expansion valve 109 is closed, the second electronic expansion valve 108 is fully opened, and the first electronic expansion valve 106 adjusts the opening degree to realize the throttling effect of the refrigerant. At this time, the indoor heat exchanger 104 serves as an evaporator, and the outdoor heat exchanger 110 serves as a condenser; the high-temperature and high-pressure refrigerant is discharged from the compressor 102, flows into the outdoor heat exchanger 110 through the four-way reversing valve 103, and then enters the subcooler 107 through the second electronic expansion valve 108, at this time, the second electronic expansion valve 108 is in a fully open state, and the refrigerant further releases heat in the subcooler 107, thereby realizing further subcooling. The refrigerant then flows into the flash evaporator 105, and the flash evaporator 105 functions as a high-pressure side accumulator. Then, the refrigerant flows into the indoor side heat exchanger 104 after flowing through the first electronic expansion valve 106 for throttling, and after the indoor side heat exchanger 104 achieves a refrigeration effect, the refrigerant sequentially flows through the four-way reversing valve 103 and the reservoir 101 and then returns to the compressor 102; in the refrigeration cycle mode, the outdoor cold air firstly flows through the subcooler 107 and then flows through the outdoor heat exchanger 110, and the subcooler 107 achieves the effect of further subcooling the refrigerant on the high-pressure side.
As shown in fig. 2, the embodiment provides a control method of a refrigeration cycle system of a heat pump type air conditioner, comprising the steps of:
step 1: after the compressor 102 is started, the refrigeration cycle system of the heat pump type air conditioner with the flash evaporator 105 and the subcooler 107 judges whether the system is in a refrigeration mode, a heating mode or a defrosting mode.
Step 2: when the system is in the cooling mode, the controller 111 adjusts the opening degrees of the first electronic expansion valve 106, the second electronic expansion valve 108, and the third electronic expansion valve 109 is fully closed. The target temperature set by the cooling condition is reached when the indoor temperature sensor 112 detects that the indoor temperature T1 is not more than T2, wherein: t2 is set at 16-35 deg.C, at which time the compressor 101 stops working.
And step 3: when the system is in the heating mode, the controller 111 adjusts the opening degrees of the first electronic expansion valve 106, the second electronic expansion valve 108, and the third electronic expansion valve 109. When the indoor temperature sensor detects that the indoor temperature T1 is not less than T3, the set target temperature of the heating working condition is reached, wherein: t3 is set at 10-32 deg.C, at which time the compressor 102 stops working.
And 4, step 4: when the system is in the defrost mode, the controller 111 adjusts the opening degree of the first electronic expansion valve 106, fully opens the second electronic expansion valve 108, and fully closes the third electronic expansion valve 109. The condition for ending the defrost condition is reached when the defrost temperature sensor 113 detects that the temperature Tw at the outlet of the subcooler 107 is greater than or equal to T4, where: t4 is set at 0-30 deg.C, at which time the compressor 102 will stop working. Or when the defrosting time t1 is more than or equal to t2, the time upper limit set by the defrosting condition is reached, wherein t2 is the set defrosting time of 0-100 min, and at the moment, the compressor 101 also stops working.
And 5: the operation is terminated, the compressor 102 is stopped, and the timer time in the controller 111 is cleared.
When the heat pump type air conditioner refrigeration cycle system heats in winter, a refrigerant (with a lower temperature level and insufficient heat supply) from an indoor side heat exchanger 104 (used as a condenser) enters a flash evaporator 105 after primary throttling, and flashed gas flows into a subcooler 107 and exchanges heat with outdoor air in the subcooler 107, so that the flashed gas is condensed into liquid, the outdoor cooler air entering an outdoor side heat exchanger 110 (used as an evaporator) is heated, the air inlet temperature of the air is improved, the evaporation temperature of the system is further improved, and the frosting of the outdoor side heat exchanger 110 can be effectively delayed; in the refrigeration cycle, the flash evaporator 105 may be used as a high-pressure accumulator, and the subcooler 107 may perform a subcooling function on the high-pressure side refrigerant, thereby increasing the cooling capacity. Therefore, the invention has positive promotion effect on the technical development of preventing or delaying the frosting of the heat pump type air conditioner system, and solves the problems of serious frosting and frequent defrosting of the existing heat pump type air conditioner in a heating mode in winter.
The above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and it should be understood by those skilled in the art that the technical solution can be modified and replaced by a plurality of simple modifications and replacements without departing from the spirit and principle of the present invention, and the modifications and replacements also fall into the protection scope covered by the claims.
Claims (10)
1. A heat pump type air conditioner refrigeration cycle system is characterized in that: including indoor side heat exchanger (104) and outdoor side heat exchanger (110), the outdoor side still is provided with flash vessel (105) and subcooler (107), the gas outlet end of flash vessel (105) links to each other with subcooler (107) and outdoor side heat exchanger (110) in proper order, the liquid outlet end of flash vessel (105) still links to each other with indoor side heat exchanger (104) and outdoor side heat exchanger (110) respectively, indoor side heat exchanger (104) and outdoor side heat exchanger (110) connect on reservoir (101) circulation pipeline through four-way reversing valve (103), reservoir (101) circulation pipeline is provided with reservoir (101) and compressor (102).
2. A heat pump type air conditioner refrigeration cycle system according to claim 1, wherein: a first electronic expansion valve (106) is arranged on a pipeline between the liquid outlet end of the flash evaporator (105) and the indoor side heat exchanger (104), a second electronic expansion valve (108) is arranged on a pipeline between the subcooler (107) and the outdoor side heat exchanger (110), and a third electronic expansion valve (109) is arranged on a pipeline between the liquid outlet end of the flash evaporator (105) and the outdoor side heat exchanger (110).
3. A heat pump type air conditioner refrigeration cycle system according to claim 2, wherein: an indoor temperature sensor (112) is also arranged on the indoor side, and a defrosting temperature sensor (113) is also arranged on the outdoor side;
the indoor temperature sensor (112), the defrosting temperature sensor (113), the first electronic expansion valve (106), the second electronic expansion valve (108), the third electronic expansion valve (109) and the compressor (102) are connected with the controller (111).
4. A heat pump type air conditioner refrigeration cycle system according to claim 3, wherein: the heat pump type air conditioner refrigeration cycle system comprises three working modes, namely a heating mode, a refrigeration mode and a defrosting mode.
5. A heat pump type air conditioner refrigeration cycle system according to claim 4, wherein: when the heat pump type air conditioner refrigeration cycle system is in a heating mode, the opening degree is adjusted through a first electronic expansion valve (106), a second electronic expansion valve (108) and a third electronic expansion valve (109) to realize the throttling effect of a refrigerant; at the moment, the indoor side heat exchanger (104) is used as a condenser, and the outdoor side heat exchanger (110) is used as an evaporator; high-temperature and high-pressure refrigerant is discharged by a compressor (102), flows into an indoor side heat exchanger (104) through a four-way reversing valve (103), is condensed and releases heat in the indoor side heat exchanger (104) to provide heat for the indoor, then enters a flash evaporator (105) through a first electronic expansion valve (106), flash vapor flashed by the flash evaporator (105) enters a subcooler (107) to realize condensation, and simultaneously heats outdoor air; the liquid in the flash evaporator (105) enters an outdoor heat exchanger (110) after being throttled by a third electronic expansion valve (109); the refrigerant flowing out of the outdoor heat exchanger (110) flows through the four-way reversing valve (103) and the liquid storage device (101) in sequence and then returns to the compressor (102).
6. A heat pump type air conditioner refrigeration cycle system according to claim 5, wherein: when the heat pump type air conditioner refrigeration cycle system is in a heating mode, outdoor cold air firstly flows through the subcooler (107) and then flows through the outdoor heat exchanger (110), the subcooler (107) condenses flash steam flowing out of the flash evaporator (105) on one hand, and heats the outdoor cold air on the other hand, so that the air inlet temperature of the outdoor heat exchanger (110) is increased, and the frosting on the surface of the outdoor heat exchanger (110) is reduced.
7. A heat pump type air conditioner refrigeration cycle system according to claim 4, wherein: when the heat pump type air conditioner refrigeration cycle system is in a refrigeration mode, the third electronic expansion valve (109) is closed, the second electronic expansion valve (108) is fully opened, and the first electronic expansion valve (106) adjusts the opening degree to realize the throttling effect of the refrigerant; at the moment, the indoor side heat exchanger (104) is used as an evaporator, and the outdoor side heat exchanger (110) is used as a condenser; high-temperature and high-pressure refrigerant is discharged by a compressor (102), flows into an outdoor heat exchanger (110) through a four-way reversing valve (103), then enters a subcooler (107) through a second electronic expansion valve (108), releases heat for the second time in the subcooler (107), and then flows into a flash evaporator (105); then, the refrigerant flows into the indoor side heat exchanger (104) after flowing through the first electronic expansion valve (106) for throttling, and after the indoor side heat exchanger (104) achieves a refrigeration effect, the refrigerant flows through the four-way reversing valve (103) and the liquid storage device (101) in sequence and returns to the compressor (102).
8. A heat pump type air conditioner refrigeration cycle system according to claim 7, wherein: when the heat pump type air conditioner refrigeration cycle system is in a refrigeration mode, outdoor cold air firstly flows through the subcooler (107) and then flows through the outdoor side heat exchanger (110), and the subcooler (107) is used for performing secondary subcooling on a refrigerant.
9. A heat pump type air conditioner refrigeration cycle system according to claim 1, wherein: the four-way reversing valve (103), the circulating pipeline of the liquid accumulator (101), the liquid accumulator (101) and the compressor (102) are arranged outside the chamber.
10. A method for controlling a refrigeration cycle system of a heat pump type air conditioner according to any one of claims 1 to 9, comprising the steps of:
the heat pump type air conditioner refrigeration cycle system judges whether the working mode is in a refrigeration mode, a heating mode or a defrosting mode;
when the refrigeration cycle system of the heat pump type air conditioner is in a refrigeration mode, the opening degree of a pipeline between the liquid outlet end of the flash evaporator (105) and the indoor side heat exchanger (104) and between the subcooler (107) and the outdoor side heat exchanger (110) is adjusted, and the pipeline between the liquid outlet end of the flash evaporator (105) and the outdoor side heat exchanger (110) is closed; when the indoor temperature T1 is detected to be not more than T2, the target temperature set by the refrigeration working condition is reached, wherein T2 is the target temperature set by refrigeration, and at the moment, the compressor (102) stops working;
when the refrigeration cycle system of the heat pump type air conditioner is in a heating mode, adjusting the opening degree of a pipeline between the liquid outlet end of the flash evaporator (105) and the indoor side heat exchanger (104), between the subcooler (107) and the outdoor side heat exchanger (110) and between the liquid outlet end of the flash evaporator (105) and the outdoor side heat exchanger (110); when the indoor temperature T1 is detected to be more than or equal to T3, the target temperature set by the heating working condition is reached, wherein T3 is the target temperature set by heating, and at the moment, the compressor (102) stops working;
when the refrigeration cycle system of the heat pump type air conditioner is in a defrosting mode, the opening degree of a pipeline between the liquid outlet end of the flash evaporator (105) and the indoor side heat exchanger (104) is adjusted, the pipeline between the subcooler (107) and the outdoor side heat exchanger (110) is completely opened, and the pipeline between the liquid outlet end of the flash evaporator (105) and the outdoor side heat exchanger (110) is closed; when the temperature Tw at the outlet pipe of the subcooler (107) is detected to be more than or equal to T4, the condition of ending defrosting is reached, wherein T4 is the target temperature set for ending defrosting, and the compressor (102) stops working at the moment; or when the defrosting time t1 is more than or equal to t2, the time upper limit set by the defrosting condition is reached, wherein t2 is the target time set by the defrosting ending, and the compressor (102) stops working at the moment.
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