CN111023372A - Heat pump system of air conditioner, air conditioner and defrosting control method of air conditioner - Google Patents
Heat pump system of air conditioner, air conditioner and defrosting control method of air conditioner Download PDFInfo
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- CN111023372A CN111023372A CN201911414400.6A CN201911414400A CN111023372A CN 111023372 A CN111023372 A CN 111023372A CN 201911414400 A CN201911414400 A CN 201911414400A CN 111023372 A CN111023372 A CN 111023372A
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- 238000010257 thawing Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims description 45
- 238000001816 cooling Methods 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 239000003570 air Substances 0.000 description 50
- 239000003507 refrigerant Substances 0.000 description 10
- 230000015654 memory Effects 0.000 description 8
- 230000005494 condensation Effects 0.000 description 7
- 238000009833 condensation Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000005057 refrigeration Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000004378 air conditioning Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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
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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
- F24F11/62—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
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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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
- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Mathematical Physics (AREA)
- Fuzzy Systems (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a heat pump system of an air conditioner, the air conditioner and a defrosting control method thereof, wherein the heat pump system comprises a compressor, an indoor heat exchanger, a first outdoor heat exchanger and a second outdoor heat exchanger which are connected in parallel, a first four-way valve and a second four-way valve; the first valve port of the first four-way valve is connected with the indoor heat exchanger, the second valve port of the first four-way valve is connected with the suction port of the compressor, the third valve port of the first four-way valve is connected with the fourth valve port of the second four-way valve, the fourth valve port of the first four-way valve is connected with the exhaust port of the compressor, the first valve port of the second four-way valve is connected with the first outdoor heat exchanger, the second valve port of the second four-way valve is connected with the indoor heat exchanger, and the third valve port of the second four-way valve is connected with the second outdoor heat exchanger. The invention ensures that the air conditioner heats continuously during defrosting, so that the indoor temperature is kept stable, and the user experience is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a heat pump system of an air conditioner, the air conditioner and a defrosting control method of the air conditioner.
Background
In the process of heating operation of the air conditioner in winter, the outdoor side heat exchanger is used as an evaporator, the surface temperature of the outdoor side heat exchanger is reduced along with the reduction of the environmental temperature, when the surface temperature of the outdoor side heat exchanger is lower than the dew point temperature of the ambient air and lower than 0 ℃, when the outdoor air flows through the outdoor side heat exchanger, moisture in the cooled air is separated out, and then a frost layer is formed on the outdoor side heat exchanger. Due to the existence of the frost layer, the heat exchange coefficient of the surface of the heat exchanger is reduced on the one hand, and the wind resistance is increased due to the reduction of the copper pipe gap on the other hand, so that the heat transfer effect of the heat exchanger is reduced, and the air conditioner has to start a defrosting mode. The air conditioner in the market at present usually adopts the four-way valve to switch the air conditioner mode into the refrigeration mode and defrost, and outdoor side heat exchanger is as the condenser, and indoor side stops heating to absorb heat from indoor side, and the defrosting cycle is generally 7-10min for indoor temperature produces great fluctuation, indoor travelling comfort greatly reduced.
Disclosure of Invention
The invention solves the problems that the heating is stopped and heat is absorbed from the indoor when the air conditioner defrosts, so that the indoor temperature fluctuation is large and the comfort is reduced.
In order to solve the problems, the invention provides a heat pump system of an air conditioner, the air conditioner and a defrosting control method thereof.
The technical scheme adopted by the invention is as follows:
according to an aspect of the present invention, there is provided a heat pump system of an air conditioner, including a compressor, an indoor heat exchanger, a first outdoor heat exchanger and a second outdoor heat exchanger connected in parallel, a first four-way valve, a second four-way valve; wherein the content of the first and second substances,
the first valve port of the first four-way valve is connected with the indoor heat exchanger, the second valve port of the first four-way valve is connected with the suction port of the compressor, the third valve port of the first four-way valve is connected with the fourth valve port of the second four-way valve, the fourth valve port of the first four-way valve is connected with the exhaust port of the compressor, the first valve port of the second four-way valve is connected with the first outdoor heat exchanger, the second valve port of the second four-way valve is connected with the indoor heat exchanger, and the third valve port of the second four-way valve is connected with the second outdoor heat exchanger.
Under the heating defrosting mode, one of the two outdoor heat exchangers is used as an evaporator, when the outdoor heat exchanger needs defrosting after frosting, the outdoor heat exchanger is switched into a condenser through the second four-way valve 6, and the other outdoor heat exchanger is switched into the evaporator, so that the two outdoor heat exchangers work alternately, the purpose of indoor uninterrupted heating is achieved, the problem of large indoor temperature difference fluctuation caused by defrosting is avoided, and the comfort of air conditioning heating is improved.
In some embodiments of the invention, the indoor heat exchanger, the first outdoor heat exchanger and the second outdoor heat exchanger are respectively connected in series with a throttling device, and each throttling device is respectively connected in parallel with a one-way valve, so that the flow requirement of the throttling device is met.
In some embodiments of the invention, the restriction device is an electronic expansion valve.
In some embodiments of the present invention, it is preferred that,
a pipeline for connecting a second valve port of the second four-way valve with the indoor heat exchanger is provided with a first valve, and a pipeline for connecting the first valve port of the first four-way valve with the indoor heat exchanger does not pass through the first valve;
a branch pipeline for communicating the first pipeline and the second pipeline is arranged between a first pipeline for connecting a first valve port of the second four-way valve with the first outdoor heat exchanger and a second pipeline for connecting a third valve port of the second four-way valve with the second outdoor heat exchanger, and a second valve is arranged on the branch pipeline.
In some embodiments of the invention, the external fan of the heat pump system comprises a forward rotation mode and a reverse rotation mode, the forward rotation mode and the reverse rotation mode can be switched, and the air flow of the external unit is always ensured to enter from the condenser at the defrosting side, so that the condition that the temperature of the air flow entering from the evaporator side is too low after heat exchange at the evaporator side and the defrosting speed is influenced when the air flow passes through the defrosting side can be prevented; while the air flow preferentially passes through the condenser on the defrost side, the air flow temperature will rise slightly, helping to slow the rate of frost formation on the evaporator side.
In some embodiments of the present invention, the outer fan is located between the first outdoor heat exchanger and the second outdoor heat exchanger.
In some embodiments of the invention, the heat pump system comprises a heating defrosting mode, a heating mode and a cooling mode, and meets the use requirements of users on the air conditioner in different environments.
In some embodiments of the present invention, it is preferred that,
when the heat pump system is in a heating and defrosting mode, after frosting of the second outdoor heat exchanger is detected, the first valve port and the fourth valve port of the second four-way valve are communicated, and the second valve port and the third valve port of the second four-way valve are communicated;
when the first outdoor heat exchanger is frosted, the first valve port and the second valve port of the second four-way valve are communicated, and the third valve port and the fourth valve port of the second four-way valve are communicated.
In some embodiments of the present invention, it is preferred that,
when the heat pump system is in a heating mode, the first valve port and the fourth valve port of the first four-way valve are communicated, the second valve port and the third valve port of the first four-way valve are communicated, and the second valve is opened or closed.
In some embodiments of the present invention, it is preferred that,
when the heat pump system is in a refrigeration mode, the first valve port and the second valve port of the first four-way valve are communicated, the third valve port and the fourth valve port of the first four-way valve are communicated, the two outdoor heat exchangers are condensers in a parallel connection mode and work simultaneously, and the indoor heat exchanger serves as an evaporator, so that the indoor refrigeration effect is good.
According to another aspect of the present invention, there is also provided an air conditioner including the heat pump system as described above.
According to another aspect of the present invention, there is also provided a defrosting control method for an air conditioner as described above, in the heating defrosting mode, when it is detected that the outdoor heat exchanger needs to be defrosted, the second four-way valve is switched, and in the defrosting process, one outdoor heat exchanger is always used as an evaporator, thereby ensuring that the indoor heat exchanger is continuously heated.
According to another aspect of the present invention, there is also provided a computer readable storage medium having stored thereon a computer program which, when executed, implements the steps of the defrost control method as described above.
Drawings
Fig. 1 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the heat pump system according to the embodiment of the present invention in the heating mode.
Fig. 3 is a schematic diagram of the heat pump system in a heating and second heat exchanger defrosting mode according to the embodiment of the present invention.
Fig. 4 is a schematic diagram of the heat pump system in a heating and first heat exchanger defrosting mode according to the embodiment of the present invention.
Fig. 5 is a schematic diagram of the heat pump system according to the embodiment of the present invention in the cooling mode.
Fig. 6 is a schematic diagram illustrating a defrosting control method of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
1-a compressor;
2-indoor heat exchanger;
3-a first outdoor heat exchanger;
4-a second outdoor heat exchanger;
5-a first four-way valve; 5-1-first valve port; 5-2-second valve port; 5-3-third valve port; 5-4-fourth valve port;
6-a second four-way valve; 6-1-first valve port; 6-2-second valve port; 6-3-third valve port; 6-4-fourth valve port;
7-first throttling means;
8-a second throttling device;
9-a third throttling means;
10-a first valve;
13-a first one-way valve;
11-a second one-way valve;
12-a third one-way valve;
14-a second valve;
15-external fan.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Certain embodiments of the invention now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. Indeed, various embodiments of the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.
In an embodiment of the present invention, a heat pump system of an air conditioner is provided, as shown in fig. 1, which includes a compressor 1, an indoor heat exchanger 2, a first outdoor heat exchanger 3 and a second outdoor heat exchanger 4 connected in parallel, a first four-way valve 5, and a second four-way valve 6.
Wherein, the first valve port 5-1 of the first four-way valve 5 is connected with the indoor heat exchanger 2, the second valve port 5-2 of the first four-way valve 5 is connected with the suction inlet of the compressor 1, the third valve port 5-3 of the first four-way valve 5 is connected with the fourth valve port 6-4 of the second four-way valve 6, the fourth valve port 5-4 of the first four-way valve 5 is connected with the exhaust outlet of the compressor 1, the first valve port 6-1 of the second four-way valve 6 is connected with the first outdoor heat exchanger 3, the second valve port 6-2 of the second four-way valve 6 is connected with the indoor heat exchanger 2, and the third valve port 6-3 of the second four-way valve 6 is connected with the second outdoor heat exchanger 4.
The first four-way valve 5 is used for switching the cooling and heating modes, and the second four-way valve 6 is used for switching the working states of the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4. Under the heating defrosting mode, one of the two outdoor heat exchangers is used as an evaporator, when the outdoor heat exchanger needs defrosting after frosting, the outdoor heat exchanger is switched into a condenser through the second four-way valve 6, and the other outdoor heat exchanger is switched into the evaporator, so that the two outdoor heat exchangers work alternately, the purpose of indoor uninterrupted heating is achieved, the problem of large indoor temperature difference fluctuation caused by defrosting is avoided, and the comfort of air conditioning heating is improved.
As shown in fig. 1, the indoor heat exchanger 2, the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 are respectively connected in series with a throttling device, which is a first throttling device 7, a second throttling device 8 and a third throttling device 9. When the air conditioner pipeline is assembled, the second throttling device 8 is connected with the first outdoor heat exchanger 3 in series, the third throttling device 9 is connected with the second outdoor heat exchanger 4 in series, and then the second throttling device 8, the first outdoor heat exchanger 3, the third throttling device 9 and the second outdoor heat exchanger 4 which are connected in series are connected in parallel.
In order to make the flow rate of the throttling device meet the requirement, a one-way valve is connected in parallel with each throttling device, and the one-way valves corresponding to the first throttling device 7, the second throttling device 8 and the third throttling device 9 are a first one-way valve 13, a second one-way valve 11 and a third one-way valve 12 respectively. In the embodiment of the present invention, the throttling device is preferably an electronic expansion valve, but is not limited thereto.
In addition, a first valve 10 is provided on a pipeline connecting the second valve port 6-2 of the second four-way valve 6 and the indoor heat exchanger 2, and it should be noted that a pipeline connecting the first valve port 5-1 of the first four-way valve 5 and the indoor heat exchanger 2 does not pass through the first valve 10. A branch pipeline for communicating the pipeline connected with the first outdoor heat exchanger 3 at the first valve port 6-1 of the second four-way valve 6 and the pipeline connected with the second outdoor heat exchanger 4 at the third valve port 6-3 of the second four-way valve 6 is arranged between the two pipelines, and a second valve 14 is arranged on the branch pipeline. Through the cooperation of the first valve 10, the second valve 14 and other parts, under the heating and defrosting mode, uninterrupted indoor heating is realized.
In the heating defrosting mode, the outer fan 15 can be switched in forward and reverse rotation, the rotation direction of the outer fan 15 is switched while the working states of the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 are switched, and the air flow of the outer fan is always ensured to enter from the defrosting side condenser. Therefore, the condition that the temperature of the airflow entering from the evaporator side is too low after the airflow passes through the evaporator side for heat exchange and influences the defrosting speed when the airflow passes through the defrosting side can be prevented; while the air flow preferentially passes through the condenser on the defrost side, the air flow temperature will rise slightly, helping to slow the rate of frost formation on the evaporator side. As a specific embodiment, two outdoor heat exchangers are disposed in the same outdoor unit casing, one of the two outdoor heat exchangers is disposed in a position where the heat exchanger is disposed in a conventional outdoor unit, so that the modification of the conventional outdoor unit can be reduced, and the cost can be reduced, and the other is disposed in front of the external fan 15, i.e., in front of the air inlet of the external unit. Further, an outer fan 15 is located between the two outdoor heat exchangers. It should be noted that the two outdoor heat exchangers are not limited to being located in the same casing, and may be respectively disposed in one casing.
The heat pump system in the embodiment of the invention not only comprises a heating defrosting mode, but also comprises a heating mode and a cooling mode. The specific operation of each operation mode will be described in detail below.
As shown in fig. 2, when the air conditioner is in the heating and defrosting mode, when the air conditioner is turned on, the first port 5-1 and the fourth port 5-4 of the first four-way valve 5 are connected, the second port 5-2 and the third port 5-3 are connected, the second four-way selector valve 6 defaults that the first port 6-1 and the second port 6-2 are connected, the third port 6-3 and the fourth port 6-4 are connected, the opening degree of the second throttle device 8 is zero, the third check valve 12 short-circuits the third throttle device 9, the second valve 14 is closed, the first valve 10 is opened, at this time, the first outdoor heat exchanger 3 does not work, the second outdoor heat exchanger 4 works as an evaporator, and the external fan 15 rotates to allow airflow to enter from the side of the first outdoor heat exchanger 3. Here, the short circuit means that the third check valve 12 circulates the refrigerant together with the third throttling device 9. For the second four-way reversing valve 6, in some embodiments, the communication is performed according to the above-mentioned default communication mode, but it is also possible to program the first valve port 6-1 to communicate with the fourth valve port 6-4, and the second valve port 6-2 to communicate with the third valve port 6-3, at this time, the first outdoor heat exchanger 3 operates as an evaporator, the second outdoor heat exchanger 4 does not operate, and the external fan 15 rotates to make the air flow enter from the second outdoor heat exchanger 4 side. The communication mode of each valve port of the second four-way valve 6 can be selected through program setting, so that the first outdoor heat exchanger 3 or the second outdoor heat exchanger 4 in the heating mode can be controlled to work.
As shown in fig. 2, the compressor 1 exhausts air, passes through a first valve port 5-1 and a fourth valve port 5-4 of a first four-way valve 5, then enters an indoor heat exchanger 2 for condensation and heat release, then passes through a first throttling device 7, then passes through a third throttling device 9 and a third one-way valve 12, enters a second outdoor heat exchanger 4 for evaporation and heat absorption, and finally returns to an air suction port of the compressor 1 through a third valve port 6-3 and a fourth valve port 6-4 of a second four-way reversing valve 6, a second valve port 5-2 and a third valve port 5-3 of the first four-way valve 5, thereby completing a heating cycle.
As shown in fig. 3, when frosting of the second outdoor heat exchanger 4 is detected, the second four-way valve 6 is switched to be connected with the first valve port 6-1 and the fourth valve port 6-4, the second valve port 6-2 and the third valve port 6-3 are connected, meanwhile, the third throttling device 9 and the first throttling device 7 work, the second throttling device 8 is short-circuited by the second one-way valve 11, at this time, the first outdoor heat exchanger 3 is switched to be an evaporator, the second outdoor heat exchanger 4 is switched to be a condenser for defrosting, meanwhile, the outer fan 15 switches the rotation direction, so that air flow enters from the second outdoor heat exchanger 4 side, when the second outdoor heat exchanger 4 is defrosted, the opening degree of the third throttling device 9 is adjusted to be zero, and the second outdoor heat exchanger 4 enters a standby working state.
The compressor 1 exhausts air, after passing through a fourth valve port 5-4 and a first valve port 5-1 of a first four-way valve 5, a refrigerant is divided into two parts, the first part enters an indoor heat exchanger 2 for condensation and heat release, and then passes through a first throttling device 7; the second part passes through the first valve 10, then passes through a second valve port 6-2 and a third valve port 6-3 of a second four-way valve 6, enters a second outdoor heat exchanger 4 for condensation and heat release, is defrosted, and passes through a third throttling device 9; the first part of refrigerant passing through the first throttling device 7 is merged with the second part of refrigerant passing through the third throttling device 9, then passes through the second throttling device 8 and the second one-way valve 11, enters the first outdoor heat exchanger 3 for evaporation and heat absorption, finally returns to the suction port of the compressor 1 through the first valve port 6-1 and the fourth valve port 6-4 of the second four-way reversing valve 6, the third valve port 5-3 and the second valve port 5-2 of the first four-way valve 5, and completes one-time heating and defrosting cycle.
As shown in fig. 4, when it is detected that the first outdoor heat exchanger 3 is frosted, the second four-way valve 6 is switched to connect the first valve port 6-1 and the second valve port 6-2, the third valve port 6-3 and the fourth valve port 6-4 are connected, the first throttling device 7 and the second throttling device 8 operate at the same time, the third throttling device 9 is short-circuited by the third one-way valve 12, the second outdoor heat exchanger 4 which is standby at this time is switched to an evaporator, the first outdoor heat exchanger 3 is switched to a condenser for defrosting, the outer fan 15 switches the rotation direction at the same time, so that the airflow enters from the first outdoor heat exchanger 3 side, when the first outdoor heat exchanger 3 is defrosted, the opening degree of the second throttling device 8 is adjusted to zero, and the first outdoor heat exchanger 3 enters the standby operation state.
The compressor 1 exhausts air, after passing through a fourth valve port 5-4 and a first valve port 5-1 of a first four-way valve 5, a refrigerant is divided into two parts, the first part enters an indoor heat exchanger 2 for condensation and heat release, and then passes through a first throttling device 7; the second part passes through the first valve 10, then passes through a second valve port 6-2 and a first valve port 6-1 of a second four-way valve 6, enters the first outdoor heat exchanger 3 for condensation and heat release, is defrosted, and passes through a second throttling device 8; the first part of refrigerant passing through the first throttling device 7 is merged with the second part of refrigerant passing through the second throttling device 8, then passes through the third throttling device 9 and the third one-way valve 12, enters the second outdoor heat exchanger 4 for evaporation and heat absorption, finally returns to the suction port of the compressor 1 through the third valve port 6-3 and the fourth valve port 6-4 of the second four-way reversing valve 6, the third valve port 5-3 and the second valve port 5-2 of the first four-way valve 5, and completes one-time heating and defrosting cycle.
It can be seen from the above that, under the heating defrosting mode, through the switching of the second four-way valve 6, the adjustment of the second throttling device 8 and the third throttling device 9, and the switching of the rotating direction of the outer fan 15, the alternate defrosting of the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 is realized, so that the air conditioner heats continuously during defrosting, the indoor temperature is kept stable, and the user experience is improved.
When the air conditioner is in a heating mode, the first outdoor heat exchanger 3 or the second outdoor heat exchanger 4 can be used as an evaporator to work, and the operation is the same as the heating cycle in the heating defrosting mode, or the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 can be used as the evaporator to work at the same time by opening the second valve 14, so that the indoor heating effect is good.
As shown in fig. 5, when the air conditioner is in the cooling mode, the first four-way valve 5 switches to connect the first port 5-1 and the second port 5-2, the third port 5-3 and the fourth port 5-4, the second four-way valve 6 defaults to connect the first port 6-1 and the second port 6-2, the third port 6-3 and the fourth port 6-4, the second valve 14 is opened, the first valve 10 is closed, the second throttling device 8 and the third throttling device 9 are in the working state, and the first one-way valve 13 short-circuits the first throttling device 7. The first and second outdoor heat exchangers 3 and 4 serve as condensers and the indoor heat exchanger 2 serves as an evaporator. Here, the first port 6-1 and the fourth port 6-4 of the second four-way valve 6 may be programmed to communicate with each other, and the second port 6-2 and the third port 6-3 may be programmed to communicate with each other.
The compressor 1 exhausts air, passes through a fourth valve port 5-4 and a third valve port 5-3 of a first four-way valve 5, then passes through a fourth valve port 6-4 and a third valve port 6-3 of a second four-way valve 6, refrigerant is divided into two parts, the first part enters a second outdoor heat exchanger 4 for condensation and heat release, and then passes through a third throttling device 9; the second part passes through a second valve 14, then enters the first outdoor heat exchanger 3 for condensation and heat release, and then passes through a second throttling device 8; the first part of refrigerant passing through the third throttling device 9 is merged with the second part of refrigerant passing through the second throttling device 8, then enters the indoor heat exchanger 2 for evaporation and heat absorption after passing through the first throttling device 7 and the first one-way valve 13, and finally returns to the suction port of the compressor 1 through the first valve port 5-1 and the second valve port 5-2 of the first four-way valve 5, thus completing the primary refrigeration cycle.
In the refrigeration mode, the two outdoor heat exchangers are condensers in a parallel connection mode and work simultaneously, and the indoor heat exchanger 2 serves as an evaporator to ensure good indoor refrigeration effect. One of the outdoor heat exchangers can also be operated by adjusting the second valve 14, the first throttling device 8 and the second throttling device 9.
In the embodiment of the invention, the heat pump system comprises a heating mode, a heating defrosting mode and a refrigerating mode, so that various air conditioning functions are realized, and the use requirements of users on air conditioners in different environments are met.
In an embodiment of the present invention, an air conditioner is further provided, which includes the heat pump system as described above, wherein in the heating and defrosting mode, the air conditioner includes two heating circulation systems, one is an indoor heating system, and the other is a defrosting system, so that uninterrupted heating during defrosting is realized, indoor temperature is kept stable, and user experience is improved.
In the embodiment of the present invention, as shown in fig. 6, in the heating and defrosting mode, when it is detected that the outdoor heat exchanger needs defrosting, the second four-way valve 6 is switched, the second throttling device 8 and the third throttling device 9 are adjusted, the first valve 10 is in an open state, and during defrosting, one outdoor heat exchanger is always used as an evaporator, so as to ensure that the indoor heat exchanger is continuously heated.
In an embodiment of the present invention, there is also provided a computer-readable storage medium having a computer program stored thereon, the computer program, when executed, implementing the steps of the defrosting control method of the air conditioner as set forth in the above embodiment.
Up to this point, the present embodiment has been described in detail with reference to the accompanying drawings. In light of the above description, those skilled in the art should clearly recognize the heat pump system of the air conditioner, the air conditioner and the defrosting control method thereof according to the present invention.
It should be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present invention. In addition, unless steps are specifically described or must occur in sequence, the order of the steps is not limited to that listed above and may be changed or rearranged as desired by the desired design. The embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e., technical features in different embodiments may be freely combined to form further embodiments.
The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware.
Furthermore, the use of ordinal numbers such as "first," "second," "third," etc., in the specification and claims to modify a corresponding element is not intended to imply any ordinal numbers for the element, nor the order in which an element is sequenced or methods of manufacture, but are used to distinguish one element having a certain name from another element having a same name.
It should be noted that throughout the drawings, like elements are represented by like or similar reference numerals. In the following description, some specific embodiments are for illustrative purposes only and should not be construed as limiting the present invention in any way, but merely as exemplifications of embodiments of the invention. Conventional structures or constructions will be omitted when they may obscure the understanding of the present invention. It should be noted that the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by hardware instructions of a program, and the program may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), one-time Programmable Read-Only Memory (otp ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), compact disc Read-Only Memory (CD-ROM), or other disk memories, A tape memory, or any other medium readable by a computer that can be used to carry or store data.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (13)
1. A heat pump system of an air conditioner is characterized by comprising a compressor (1), an indoor heat exchanger (2), a first outdoor heat exchanger (3) and a second outdoor heat exchanger (4) which are connected in parallel, a first four-way valve (5) and a second four-way valve (6); wherein the content of the first and second substances,
a first valve port (5-1) of the first four-way valve (5) is connected with the indoor heat exchanger (2), a second valve port (5-2) of the first four-way valve (5) is connected with a suction port of the compressor (1), a third valve port (5-3) of the first four-way valve (5) is connected with a fourth valve port (6-4) of the second four-way valve (6), a fourth valve port (5-4) of the first four-way valve (5) is connected with an exhaust port of the compressor (1), a first valve port (6-1) of the second four-way valve (6) is connected with the first outdoor heat exchanger (3), a second valve port (6-2) of the second four-way valve (6) is connected with the indoor heat exchanger (2), and a third valve port (6-3) of the second four-way valve (6) is connected with the second outdoor heat exchanger (4).
2. The heat pump system according to claim 1, wherein the indoor heat exchanger (2), the first outdoor heat exchanger (3) and the second outdoor heat exchanger (4) are connected in series with a throttling device, and each throttling device is connected in parallel with a one-way valve.
3. The heat pump system of claim 2, wherein the throttling device is an electronic expansion valve.
4. The heat pump system of claim 2,
a first valve (10) is arranged on a pipeline connecting a second valve port (6-2) of the second four-way valve (6) with the indoor heat exchanger (2), and a pipeline connecting a first valve port (5-1) of the first four-way valve (5) with the indoor heat exchanger (2) does not pass through the first valve (10);
a branch pipeline for communicating the first pipeline and the second pipeline is arranged between a first pipeline connected with the first outdoor heat exchanger (3) through a first valve port (6-1) of the second four-way valve (6) and the first outdoor heat exchanger (3) and a second pipeline connected with a third valve port (6-3) of the second four-way valve (6) and the second outdoor heat exchanger (4), and a second valve (14) is arranged on the branch pipeline.
5. The heat pump system according to claim 1, wherein the external fan (15) of the heat pump system comprises a forward mode and a reverse mode, which are switchable.
6. Heat pump system according to claim 5, characterized in that the outer fan (15) is located between the first (3) and second (4) outdoor heat exchangers.
7. The heat pump system of claim 4, wherein the heat pump system comprises a heating defrost mode, a heating mode, and a cooling mode.
8. The heat pump system of claim 7,
when the heat pump system is in a heating and defrosting mode, after frosting of the second outdoor heat exchanger (4) is detected, the first valve port (6-1) and the fourth valve port (6-4) of the second four-way valve (6) are communicated, and the second valve port (6-2) and the third valve port (6-3) of the second four-way valve (6) are communicated;
when the first outdoor heat exchanger (3) is frosted, the first valve port (6-1) and the second valve port (6-2) of the second four-way valve (6) are communicated, and the third valve port (6-3) and the fourth valve port (6-4) of the second four-way valve (6) are communicated.
9. The heat pump system of claim 7,
when the heat pump system is in a heating mode, the first valve port (5-1) and the fourth valve port (5-4) of the first four-way valve (5) are communicated, the second valve port (5-2) and the third valve port (5-3) of the first four-way valve (5) are communicated, and the second valve (14) is opened or closed.
10. The heat pump system of claim 7,
when the heat pump system is in a cooling mode, the first valve port (5-1) and the second valve port (5-2) of the first four-way valve (5) are communicated, and the third valve port (5-3) and the fourth valve port (5-4) of the first four-way valve (5) are communicated.
11. An air conditioner characterized in that it comprises a heat pump system according to any one of claims 1-10.
12. A defrosting control method of an air conditioner according to claim 11, characterized in that in the heating defrosting mode, when it is detected that the outdoor heat exchanger needs to be defrosted, the second four-way valve (6) is switched, and in the defrosting process, one outdoor heat exchanger is always used as an evaporator, thereby ensuring that the indoor heat exchanger is continuously heated.
13. A computer-readable storage medium having a computer program stored thereon, wherein the computer program when executed implements the steps of the defrost control method of claim 12.
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| CN201911414400.6A CN111023372A (en) | 2019-12-31 | 2019-12-31 | Heat pump system of air conditioner, air conditioner and defrosting control method of air conditioner |
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| CN201911414400.6A CN111023372A (en) | 2019-12-31 | 2019-12-31 | Heat pump system of air conditioner, air conditioner and defrosting control method of air conditioner |
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