CN110030665B - Defrosting control method and device and air conditioner - Google Patents
Defrosting control method and device and air conditioner Download PDFInfo
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- CN110030665B CN110030665B CN201910316467.XA CN201910316467A CN110030665B CN 110030665 B CN110030665 B CN 110030665B CN 201910316467 A CN201910316467 A CN 201910316467A CN 110030665 B CN110030665 B CN 110030665B
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Air Conditioning Control Device (AREA)
Abstract
The invention provides a defrosting control method and device and an air conditioner, and relates to the technical field of air conditioners. The method comprises the following steps: and in the heating mode, whether the air conditioner meets the defrosting control condition is judged according to the detected outdoor environment temperature, the defrosting temperature and the running time of the compressor, when the air conditioner meets the defrosting control condition, the second valve element and the fourth valve element are controlled to be closed, and the first valve element and the third valve element are opened, so that part of the refrigerant in the exhaust pipe enters the indoor unit heat exchanger through the four-way valve, and the other part of the refrigerant enters the outdoor unit heat exchanger through the first valve element and the second inlet pipe. So, can make in the off-premises station heat exchanger with the first part of advancing pipe, first exit tube intercommunication normally heat the operation, the air conditioner internal unit need not to shut down, and advance the pipe with the second in the off-premises station heat exchanger, the part of second exit tube intercommunication will refrigerate the operation, carries out the outer quick-witted defrosting, has realized the effect that the internal unit does not shut down the defrosting, has effectively improved the unable problem of heating of current defrosting in-process, has improved user experience.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a defrosting control method and device and an air conditioner.
Background
With the development of society, the living standard of people is continuously improved, the pursuit living quality is higher and higher, and the use of air conditioners is more and more common. At present, the air conditioner can make the condenser surface produce the comdenstion water when heating the operation, because external low temperature environment, the comdenstion water can condense and produce the frost layer in the condenser surface, will influence the heat exchange efficiency of condenser along with the thickening on frost layer to influence the effect of heating.
In order to solve the problem that the heating effect is influenced by frost layer accumulation, the frosting condition is generally judged by detecting the temperature of an outer disc through a sensor, when the defrosting requirement is met, the four-way valve is reversed, the outdoor unit is defrosted by switching to a refrigerating mode, and the indoor unit is stopped at the moment so as to prevent cold air from blowing out. In the defrosting mode, the intermittent shutdown of the internal machine can occur, and the user experience is influenced.
Disclosure of Invention
The invention solves the problem that the air conditioner needs to change the refrigeration mode to defrost the outer machine, which causes intermittent shutdown of the inner machine and influences user experience.
In order to solve the above problems, the present invention provides a defrosting control method, which is applied to an air conditioner, the air conditioner comprises an outdoor heat exchanger, an indoor heat exchanger, a four-way valve and a compressor, an inlet pipe of the outdoor heat exchanger, an indoor heat exchanger and an exhaust pipe of the compressor are all connected with the four-way valve, the inlet pipe of the outdoor heat exchanger comprises a first inlet pipe and a second inlet pipe, an outlet pipe of the outdoor heat exchanger comprises a first outlet pipe and a second outlet pipe, the first inlet pipe is communicated with the first outlet pipe, the second inlet pipe is communicated with the second outlet pipe, the first outlet pipe is connected with the indoor heat exchanger, the second outlet pipe is connected with a return air pipe of the compressor, a first connection point is arranged on the exhaust pipe, a second connection point is arranged on the second inlet pipe, and a first connection pipe is arranged between the first connection point and the second connection point, a first valve is arranged on the first connecting pipe, a third connecting point is arranged on the first inlet pipe, one end of the second inlet pipe is connected with the third connecting point, a second valve is arranged on the second inlet pipe and arranged between the second connecting point and the third connecting point, a fourth connecting point is arranged on the first outlet pipe, a fifth connecting point is arranged on the second outlet pipe, a third valve is arranged on the second outlet pipe and arranged between the fifth connecting point and the air return pipe, a second connecting pipe is arranged between the fourth connecting point and the fifth connecting point, and a fourth valve is arranged on the second connecting pipe; the method comprises the following steps:
in the heating mode, judging whether the air conditioner meets defrosting control conditions or not according to the detected outdoor environment temperature, defrosting temperature and the running time of the compressor;
when the air conditioner meets the defrosting control condition, the second valve element and the fourth valve element are controlled to be closed, the first valve element and the third valve element are opened, so that part of refrigerant in the exhaust pipe enters the indoor unit heat exchanger through the four-way valve, and the other part of refrigerant enters the outdoor unit heat exchanger through the first valve element and the second inlet pipe.
In the invention, the exhaust pipe of the compressor is not only communicated with the four-way valve through a first connecting point, but also communicated with a second inlet pipe of the outdoor heat exchanger through a first connecting point and a first connecting pipe, the inlet pipe of the outdoor heat exchanger is divided into a first inlet pipe and a second inlet pipe, the outlet pipe of the outdoor heat exchanger is also divided into a first outlet pipe and a second outlet pipe, the first inlet pipe is communicated with the first outlet pipe, and the second inlet pipe is communicated with the second outlet pipe and respectively corresponds to part of heat exchange area on the outdoor heat exchanger. When the air conditioner accords with defrosting control conditions in a heating mode, the first valve element and the third valve element are opened, and the second valve element and the fourth valve element are closed, so that part of refrigerant in the exhaust pipe enters the indoor unit heat exchanger through the four-way valve, and the other part of refrigerant enters the outdoor unit heat exchanger through the first valve element and the second inlet pipe, so that the part of the outdoor unit heat exchanger communicated with the first inlet pipe and the first outlet pipe can be normally heated and operated, the indoor unit of the air conditioner does not need to be stopped, the part of the outdoor unit heat exchanger communicated with the second inlet pipe and the second outlet pipe can be cooled and operated, the defrosting of the outdoor unit is carried out, the effect that the indoor unit is not stopped to defrost is achieved, the problems that noise is caused by frequent starting and stopping of the indoor unit in the existing defrosting process and the heating cannot be carried out during defrosting are effectively solved, and.
Further, the method further comprises:
and after the first valve element is opened, adjusting the opening degree of the first valve element according to the defrosting temperature.
In the invention, when defrosting control is carried out, the exhaust pipe of the compressor, the first valve element, the second inlet pipe, the outdoor heat exchanger, the second outlet pipe and the air return pipe of the compressor form a defrosting loop, and the exhaust pipe of the compressor, the four-way valve, the indoor heat exchanger, the first outlet pipe, the outdoor heat exchanger, the first inlet pipe, the four-way valve and the air return pipe of the compressor form a heating loop, so that the defrosting loop only circulates at the outdoor unit of the air conditioner and is shorter than the heating loop, therefore, the flow of a refrigerant in the defrosting loop can be controlled by adjusting the opening degree of the first valve element.
Further, the adjusting the opening degree of the first valve element according to the defrosting temperature includes:
and when the defrosting temperature is less than or equal to a first preset temperature, controlling the opening degree of the first valve to increase.
In the present invention, the lower the defrosting temperature is, the thicker the frost is in the outdoor heat exchanger, the larger the required refrigerant flow is, and therefore, the opening degree of the first valve needs to be increased.
Further, the adjusting the opening degree of the first valve element according to the defrosting temperature includes:
and when the defrosting temperature is higher than a first preset temperature and lower than or equal to a second preset temperature, controlling the opening degree of the first valve to be kept unchanged.
Further, the adjusting the opening degree of the first valve element according to the defrosting temperature includes:
and when the defrosting temperature is higher than a second preset temperature and lower than or equal to a third preset temperature, controlling the opening degree of the first valve to be reduced.
Further, the adjusting the opening degree of the first valve element according to the defrosting temperature includes:
and when the defrosting temperature is higher than a third preset temperature and the duration time is longer than a first preset time, if the collecting temperature of a preset collecting point of the outdoor unit heat exchanger is higher than a fourth preset temperature, controlling the first valve to be closed.
Further, the method further comprises:
after the closing time of the first valve element reaches second preset time, controlling the third valve element to close, and controlling the second valve element and the fourth valve element to open;
and when the temperature of the coil of the heat exchanger of the indoor unit is detected to be higher than a fifth preset temperature, controlling an inner fan of the air conditioner to operate at a set air speed, and quitting defrosting control.
Further, the method further comprises:
and when the air conditioner meets the defrosting control condition, controlling an inner fan of the air conditioner to reduce the wind speed to operate.
In the invention, after the air conditioner enters defrosting control, the phenomenon of cold air blowing caused by the reduction of the heat exchange function of the heat exchanger of the outdoor unit can be effectively prevented by controlling the inner fan of the air conditioner to rotate to low air.
Further, the method further comprises:
and when the air conditioner meets the defrosting control condition, controlling an outer fan of the air conditioner to stop running or reducing the wind speed of the outer fan to a preset value.
In the invention, after the air conditioner enters the defrosting control, one part of the heat exchanger of the outdoor unit is normally heated and operated, and the other part of the heat exchanger of the outdoor unit is refrigerated and defrosted, so that the air speed of the external fan can be controlled to be reduced and the operation can be stopped.
Further, the step of judging whether the air conditioner meets the defrosting control condition according to the detected outdoor environment temperature, the defrosting temperature and the running time of the compressor comprises:
and when the outdoor environment temperature is less than or equal to a sixth preset temperature and the duration is greater than a third preset time, the continuous operation time of the compressor is greater than a fourth preset time or the accumulated operation time of the compressor is greater than a fifth preset time, the defrosting temperature is less than a seventh preset temperature and the duration is greater than the sixth preset time, determining that the air conditioner meets the defrosting control condition.
Further, when the number of times that the air conditioner continuously meets the defrosting control condition in the heating mode is larger than a preset number of times, the first valve element and the third valve element are controlled to be closed, the second valve element and the fourth valve element are controlled to be opened, and meanwhile the air conditioner is controlled to be switched from the heating mode to the cooling mode to operate.
In the invention, when the times of the air conditioner continuously meeting the defrosting control condition in the heating mode are more than the preset times, the first valve and the third valve are controlled to be closed, the second valve and the fourth valve are controlled to be opened, and meanwhile, the air conditioner is controlled to be switched from the heating mode to the cooling mode to operate, so that the defrosting of the outdoor unit is carried out, the defrosting effect is improved, and the user experience is improved.
The invention also provides a defrosting control device, which is applied to an air conditioner, the air conditioner comprises an outdoor heat exchanger, an indoor heat exchanger, a four-way valve and a compressor, an inlet pipe of the outdoor heat exchanger, an indoor heat exchanger and an exhaust pipe of the compressor are all connected with the four-way valve, the inlet pipe of the outdoor heat exchanger comprises a first inlet pipe and a second inlet pipe, an outlet pipe of the outdoor heat exchanger comprises a first outlet pipe and a second outlet pipe, the first inlet pipe is communicated with the first outlet pipe, the second inlet pipe is communicated with the second outlet pipe, the first outlet pipe is connected with the indoor heat exchanger, the second outlet pipe is connected with a return pipe of the compressor, the exhaust pipe is provided with a first connecting point, the second inlet pipe is provided with a second connecting point, and a first connecting pipe is arranged between the first connecting point and the second connecting point, a first valve is arranged on the first connecting pipe, a third connecting point is arranged on the first inlet pipe, one end of the second inlet pipe is connected with the third connecting point, a second valve is arranged on the second inlet pipe and arranged between the second connecting point and the third connecting point, a fourth connecting point is arranged on the first outlet pipe, a fifth connecting point is arranged on the second outlet pipe, a third valve is arranged on the second outlet pipe and arranged between the fifth connecting point and the air return pipe, a second connecting pipe is arranged between the fourth connecting point and the fifth connecting point, and a fourth valve is arranged on the second connecting pipe; the device comprises:
the judging module is used for judging whether the air conditioner meets defrosting control conditions or not according to the detected outdoor environment temperature, defrosting temperature and the running time of the compressor under the heating mode;
and the control module is used for controlling the second valve element and the fourth valve element to be closed when the air conditioner meets the defrosting control condition, and the first valve element and the third valve element are opened so that one part of refrigerant in the exhaust pipe enters the indoor unit heat exchanger through the four-way valve and the other part of refrigerant enters the outdoor unit heat exchanger through the first valve element and the second inlet pipe.
The invention also provides an air conditioner, which comprises an outdoor heat exchanger, an indoor heat exchanger, a four-way valve, a compressor and a controller, wherein an inlet pipe of the outdoor heat exchanger, an inlet pipe of the indoor heat exchanger and an exhaust pipe of the compressor are all connected with the four-way valve, the inlet pipe of the outdoor heat exchanger comprises a first inlet pipe and a second inlet pipe, an outlet pipe of the outdoor heat exchanger comprises a first outlet pipe and a second outlet pipe, the first inlet pipe is communicated with the first outlet pipe, the second inlet pipe is communicated with the second outlet pipe, the first outlet pipe is connected with the indoor heat exchanger, the second outlet pipe is connected with a return pipe of the compressor, the exhaust pipe is provided with a first connecting point, the second inlet pipe is provided with a second connecting point, a first connecting pipe is arranged between the first connecting point and the second connecting point, and the first connecting pipe is provided with a first valve element, the defrosting control method is characterized in that a third connection point is arranged on the first inlet pipe, one end of the second inlet pipe is connected with the third connection point, a second valve piece is arranged on the second inlet pipe and is arranged between the second connection point and the third connection point, a fourth connection point is arranged on the first outlet pipe, a fifth connection point is arranged on the second outlet pipe, a third valve piece is arranged on the second outlet pipe and is arranged between the fifth connection point and the air return pipe, a second connection pipe is arranged between the fourth connection point and the fifth connection point, a fourth valve piece is arranged on the second connection pipe, and the controller runs a computer program to execute the defrosting control method.
Furthermore, a check valve is arranged between the air return pipe of the compressor and the four-way valve, and the check valve is used for preventing the refrigerant flowing out of the second outlet pipe from flowing back to the four-way valve.
In the invention, the one-way valve structure is arranged at the air return pipe side of the compressor, so that the backflow of the heating refrigerant is effectively prevented from being influenced because the refrigerant flowing out of the second outlet pipe flows back to the four-way valve.
Further, the tail end of the outdoor unit heat exchanger is connected with the second outlet pipe.
In the invention, in order to ensure the defrosting effect in the outdoor heat exchanger, the tail end of the outdoor heat exchanger is connected with the second outlet pipe, so that the bottommost flow path in the outdoor heat exchanger is in a defrosting loop.
Drawings
FIG. 1 is a schematic diagram of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a defrosting control method according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a defrosting control method according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a defrosting control method according to an embodiment of the present invention;
FIG. 5 is a schematic view showing the variation of the opening degree of the first valve element according to the variation of the defrosting temperature;
fig. 6 is a schematic functional block diagram of a defrosting control device according to an embodiment of the present invention.
Description of reference numerals: 10-an air conditioner; 100-an outdoor unit; 200-internal machine units; 300-a defrosting control device; 101-a four-way valve; 102-a compressor; 103-an exhaust pipe; 104-outdoor heat exchanger; 105-inlet pipe; 106-muffler; 107-an outlet pipe; 108-a capillary tube; 109-a first connection tube; 110-a second connecting tube; 111-an external fan; 112-defrosting temperature sensor; 113-outdoor temperature sensor; 114-middle temperature sensor; 115-a one-way valve; 201-indoor heat exchanger; 202-an inner fan; 203-indoor return air temperature sensor; 204-inner disc temperature sensor; 310-a judgment module; 320-a control module; 1051-a first inlet tube; 1052-a second inlet tube; 1071 — a first exit tube; 1072-a second outlet tube; d-a first interface; c-a second interface; s-a third interface; e-a fourth interface; f1 — first valve element; f2 — second valve element; f3 — third valve element; f4-fourth valve element; l1 — first connection point; l2-second point of attachment; l3-third point of attachment; l4-fourth point of attachment; l5-fifth connection point.
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.
Fig. 1 is a schematic diagram of an air conditioner 10 according to an embodiment of the present invention. The air conditioner 10 includes an outdoor unit 100 and an indoor unit 200, in the outdoor unit 100, a first interface D of a four-way valve 101 is connected with an exhaust pipe 103 of a compressor 102, a second interface C of the four-way valve 101 is connected with an inlet pipe 105 of an outdoor heat exchanger 104, and a third interface S of the four-way valve 101 is connected with an air return pipe 106 of the compressor 102; the inlet pipe 105 of the outdoor heat exchanger 104 comprises a first inlet pipe 1051 and a second inlet pipe 1052, the outlet pipe 107 of the outdoor heat exchanger 104 comprises a first outlet pipe 1071 and a second outlet pipe 1072, the first inlet pipe 1051 is communicated with the first outlet pipe 1071, the second inlet pipe 1052 is communicated with the second outlet pipe 1072, the heat exchange areas of the outdoor heat exchanger 104 are respectively half corresponding to the heat exchange areas, and the second outlet pipe 1072 is connected with the return pipe 106; in the indoor unit 200, one end of the indoor unit heat exchanger 201 is connected to the fourth port E of the four-way valve 101, and the other end of the indoor unit heat exchanger 201 is connected to the first outlet pipe 1071 through the capillary tube 108.
A first connection point L1 is disposed on the exhaust pipe 103, a second connection point L2 is disposed on the second inlet pipe 1052, a first connection pipe 109 is disposed between the first connection point L1 and the second connection point L2, a first valve element F1 is disposed on the first connection pipe 109, a third connection point L3 is disposed on the first inlet pipe 1051, one end of the second inlet pipe 1052 is connected to the third connection point L3, a second valve element F2 and a second valve element F2 are disposed between the second connection point L2 and the third connection point L3 are disposed on the second inlet pipe 1052, a fourth connection point L4 is disposed on the first outlet pipe 1071, a fifth connection point L5 is disposed on the second outlet pipe 1072, a third valve element F3 and a third valve element F3 are disposed between the fifth connection point L5 and the return pipe 106 of the compressor 102, a second connection pipe 110 is disposed between the fourth connection point L4 and the fifth connection point L5, and a fourth connection pipe F4 is disposed on the second connection pipe 110.
The first valve element F1 may be an electronic expansion valve, and the second valve element F2, the third valve element F3, and the fourth valve element F4 may be solenoid valves or electronic expansion valves. When the air conditioner 10 is operating under normal conditions, the first valve element F1 and the third valve element F3 remain closed, and the second valve element F2 and the fourth valve element F4 remain open.
The first connection point L1, the second connection point L2, the third connection point L3, the fourth connection point L4 and the fifth connection point L5 are all three-way structures, and are used for realizing one-to-two or two-in-one of the pipelines.
In the air conditioner 10 shown in fig. 1, the defrosting temperature sensor 112, the outdoor temperature sensor 113, and the middle temperature sensor 114 provided in the outer unit 100 are used for defrosting temperature, outdoor ambient temperature, and middle temperature of the outdoor unit heat exchanger 104, respectively, and the indoor return air temperature sensor 203 and the inner panel temperature sensor 204 provided in the inner unit 200 are used for detecting indoor return air temperature and coil temperature of the indoor unit heat exchanger 201, respectively.
A check valve 115 is disposed between the return pipe 106 of the compressor 102 and the four-way valve 101, and the check valve 115 is used to prevent the refrigerant flowing out of the second outlet pipe 1072 from flowing back to the four-way valve 101 during the defrosting operation of the air conditioner 10, thereby preventing the heating refrigerant from flowing back.
Optionally, since the frosted water flows downward in the outdoor heat exchanger 104, the temperature of the bottommost flow path of the outdoor heat exchanger 104 is relatively low, and if the bottommost flow path is not in the defrosting loop, the frosting of the bottommost flow path of the outdoor heat exchanger 104 is not clean, in this embodiment, the end of the outdoor heat exchanger 104 may be connected to the second outlet pipe 1072, so that the bottommost flow path of the outdoor heat exchanger 104 is in the defrosting loop, thereby improving the defrosting effect of the outdoor heat exchanger 104.
In this embodiment, the air conditioner 10 may further include a controller (not shown in fig. 1), which may be located in the external unit 100 or the internal unit 200, and the controller stores program instructions/modules corresponding to the defrosting control method and apparatus provided by the embodiment of the present invention, and executes various functional applications and data processing by executing these computer programs and modules.
Fig. 2 is a schematic flow chart of a defrosting control method according to an embodiment of the present invention. It should be noted that the defrosting control method according to the present invention is not limited to the specific sequence shown in fig. 2 and described below. It should be understood that in other embodiments, the order of some steps in the defrosting control method according to the present invention may be interchanged according to actual needs, or some steps may be omitted or deleted. The defrosting control method can be applied to the above controller, and the specific flow shown in fig. 2 will be described in detail below.
And step S101, judging whether the air conditioner meets defrosting control conditions or not according to the detected outdoor environment temperature, defrosting temperature and the running time of the compressor in the heating mode.
Specifically, when the outdoor environment temperature is less than or equal to the sixth preset temperature and the duration is greater than the third preset time, the continuous operation time of the compressor 102 is greater than the fourth preset time, or the accumulated operation time of the compressor 102 is greater than the fifth preset time, the defrosting temperature is less than the seventh preset temperature and the duration is greater than the sixth preset time, it is determined that the air conditioner 10 meets the defrosting control condition.
The outdoor ambient temperature Tao may be detected by the outdoor temperature sensor 113, and the defrosting temperature Tdef may be detected by the defrosting temperature sensor 112.
And S102, when the air conditioner meets the defrosting control condition, controlling the second valve element and the fourth valve element to be closed, and opening the first valve element and the third valve element so that one part of refrigerant in the exhaust pipe enters the indoor unit heat exchanger through the four-way valve, and the other part of refrigerant enters the outdoor unit heat exchanger through the first valve element and the second inlet pipe.
In the present embodiment, the first valve element F1 may be opened by a preset initial number of steps, which may be 160PLS, for example. When the air conditioner 10 meets the defrosting control condition, the defrosting control is performed, and by opening the first valve element F1 and the third valve element F3, and the second valve element F2 and the fourth valve element F4 are closed, so that a part of the refrigerant in the exhaust pipe 103 enters the indoor unit heat exchanger 201 through the four-way valve 101, another part of the refrigerant enters the outdoor unit heat exchanger 104 through the first valve element F1 and the second inlet pipe 1052, thus, the portion of the outdoor heat exchanger 104 communicating with the first inlet pipe 1051 and the first outlet pipe 1071 can be normally operated for heating, the indoor unit 200 does not need to be stopped, and the portion of the outdoor unit heat exchanger 104 communicating with the second inlet pipe 1052 and the second outlet pipe 1072 performs cooling operation to defrost the outdoor unit, therefore, the defrosting effect of the indoor unit without stopping is realized, the problems of noise caused by frequent starting and stopping of the indoor unit in the existing defrosting process and incapability of heating during defrosting are effectively solved, and the user experience is improved.
Alternatively, in order to prevent the occurrence of the cold air blowing phenomenon due to the decrease of the heat exchange function of the outdoor heat exchanger 104 after the air conditioner 10 enters the defrosting control, the inner fan 202 of the air conditioner 10 may be first controlled to operate at a reduced air speed when the air conditioner 10 meets the defrosting control condition.
Alternatively, after the air conditioner 10 enters the defrosting control, one part of the outdoor heat exchanger 104 is normally operated for heating, and the other part is operated for cooling for defrosting, so the operation of the external fan 111 of the air conditioner 10 may be controlled to stop or the wind speed of the external fan 111 may be reduced to a preset value while the second valve element F2 and the fourth valve element F4 are controlled to close and the first valve element F1 and the third valve element F3 are controlled to open. The preset value can be understood as the preset minimum rotation speed of the outer fan 111.
During the defrosting operation, the exhaust pipe 103 of the compressor 102, the first valve element F1, the second inlet pipe 1052, the outdoor heat exchanger 104, the second outlet pipe 1072 and the air return pipe 106 of the compressor 102 form a defrosting loop, the exhaust pipe 103 of the compressor 102, the four-way valve 101, the indoor heat exchanger 201, the first outlet pipe 1071, the outdoor heat exchanger 104, the first inlet pipe 1051, the four-way valve 101 and the air return pipe 106 of the compressor 102 form a heating loop, and since the defrosting loop circulates only in the outdoor unit of the air conditioner and is shorter than the heating loop, the opening degree of the first valve element F1 is adjusted according to the frosting condition in the outdoor heat exchanger 104, the refrigerant flow rate in the defrosting loop can be controlled, and the defrosting efficiency is improved. Based on this, fig. 3 shows another schematic flow chart of the defrosting control method provided by the embodiment of the present invention, and the method may further include:
and step S103, after the first valve element is opened, adjusting the opening degree of the first valve element according to the defrosting temperature.
Specifically, when the defrosting temperature is lower than or equal to a first preset temperature, the opening degree of the first valve element F1 is controlled to be increased, when the defrosting temperature is higher than the first preset temperature and lower than or equal to a second preset temperature, the opening degree of the first valve element F1 is controlled to be kept unchanged, when the defrosting temperature is higher than the second preset temperature and lower than or equal to a third preset temperature, the opening degree of the first valve element F1 is controlled to be decreased, and when the defrosting temperature is higher than the third preset temperature and the duration time is longer than the first preset time, if the collection temperature of the preset collection point of the outdoor heat exchanger 104 is higher than a fourth preset temperature, the first valve element F1 is controlled to be closed.
The collected temperature TC of the preset collection point of the outdoor heat exchanger 104 can be detected by the middle temperature sensor 114, that is, the collected temperature TC of the preset collection point of the outdoor heat exchanger 104 is the middle temperature of the outdoor heat exchanger 104.
It can be understood that, when the defrosting temperature Tdef is lower, it indicates that the frost formation in the outdoor heat exchanger 104 is thicker, and the refrigerant flow rate required in the defrosting loop is also larger, so that the opening degree of the first valve element F1 needs to be increased.
The adjustment range of the number of steps of the electronic expansion valve is 0PLS to 500PLS, the effective adjustment interval is generally 80PLS to 480PLS, and the probability of step loss of the electronic expansion valve is higher as the upper limit value and the lower limit value are closer. Therefore, in the present application, the first valve element F1 is set in the step number adjustment range of 100PLS to 450 PLS. That is, the maximum number of steps does not generally exceed 450PLS when the opening degree of the first valve element F1 is increased, and the minimum number of steps does not fall below 100PLS when the opening degree of the first valve element F1 is decreased.
Fig. 4 is a schematic flow chart of a defrosting control method according to an embodiment of the present invention. The defrosting control method can also comprise the following steps:
and step S104, after the closing time of the first valve element reaches a second preset time, controlling the third valve element to close, and controlling the second valve element and the fourth valve element to open.
And S105, when the temperature of the coil of the heat exchanger of the indoor unit is detected to be higher than a fifth preset temperature, controlling an inner fan of the air conditioner to operate at a set air speed, and quitting defrosting control.
The coil temperature of the indoor heat exchanger 201 can be detected by the inner coil temperature sensor 204, and the set wind speed can be understood as the rotation speed of the inner fan 202 when the air conditioner 10 is in normal operation.
And step S106, when the times of the air conditioner continuously meeting the defrosting control condition in the heating mode are larger than the preset times, controlling the first valve piece and the third valve piece to be closed, and controlling the second valve piece and the fourth valve piece to be opened, and simultaneously controlling the air conditioner to be switched from the heating mode to the cooling mode to operate.
In this embodiment, only a part of the outdoor heat exchanger 104 is used for defrosting, and there may be a case where defrosting is not clean under the conditions of too low temperature and too high humidity, thereby affecting user experience. In view of this, when the air conditioner 10 defrosts according to the method of the above steps S101 to S105 for a certain number of times, the air conditioner 10 may be controlled to perform a normal logical defrosting, at this time, the first valve element F1 and the third valve element F3 are closed, the second valve element F2 and the fourth valve element F4 are opened, the air conditioner 10 is switched from the heating mode to the cooling mode, and the indoor unit is shut down to prevent cold air from being blown out.
Next, an example is given to explain in detail the above-described step S101 to step S106. Assuming that the preset times are 3 times, the first preset temperature is-2 ℃, the second preset temperature is 7 ℃, the third preset temperature is 12 ℃, the fourth preset temperature is 7 ℃, the fifth preset temperature is 45 ℃, the sixth preset temperature is 0 ℃, the seventh preset temperature is-2 ℃, the first preset time is 2min, the second preset time is 5S, the third preset time is 5min, the fourth preset time is 5min, the fifth preset time is 40min, and the sixth preset time is 5 min. When the air conditioner 10 is operated in the heating mode, if the outdoor ambient temperature Tao, the defrosting temperature Tdef, and the operation time of the compressor 102 are detected to simultaneously satisfy the following 3 conditions: firstly, the outdoor environment temperature Tao is less than or equal to 0 ℃ and the duration time is more than 5 min; the continuous operation time of the compressor 102 is more than 5min or the accumulated operation time of the compressor 102 is more than 40 min; thirdly, when the defrosting temperature Tdef is less than-2 ℃ and the duration is more than 5min, the air conditioner 10 is determined to meet the defrosting control condition and needs to enter the defrosting control process.
After entering the defrosting operation, the inner fan 202 of the air conditioner 10 is controlled to rotate to a low wind to prevent the cold wind blowing phenomenon caused by the reduction of the heat exchange from the outside, then the first valve element F1 and the third valve element F3 are controlled to be opened, the second valve element F2 and the fourth valve element F4 are controlled to be closed, the initial opening step number of the first valve element F1 is 160PLS, at this time, one part of the outdoor heat exchanger 104 performs the cooling operation (defrosting), the other part performs the normal heating operation, and the rotation speed of the outer fan 111 is controlled to be reduced to the lowest or stopped. When the first valve element F1 is opened, the defrosting temperature Tdef will gradually increase due to defrosting, and the relationship between the opening degree of the first valve element F1 and the defrosting temperature Tdef can be referred to fig. 5, when Tdef is less than or equal to-2 ℃, the opening degree of the first valve element F1 needs to be gradually increased, and the maximum opening degree is not higher than 450 PLS; when Tdef is more than-2 and less than or equal to 7 ℃, the opening degree of the first valve element F1 is kept consistent with the previous state; when Tdef is more than 7 and less than or equal to 12 ℃, the opening degree of the first valve element F1 is gradually reduced, and the lowest opening degree is 100 PLS; when Tdef is more than 12 ℃ and the duration is more than 2min, detecting the middle temperature TC of the outdoor heat exchanger 104, if TC is more than 7 ℃, closing the first valve element F1, otherwise, continuing to operate and repeatedly executing the previous operation until TC is more than 7 ℃. When the first valve element F1 is closed for 5S, the third valve element F3 is closed, the second valve element F2 and the fourth valve element F4 are opened simultaneously, the coil temperature TE of the indoor unit heat exchanger 201 is detected, and when the TE is greater than 45 ℃, the inner fan 202 is controlled to operate at the set wind speed, and the defrosting control is quit.
After the air conditioner 10 continuously performs the defrosting control process for 3 times in the heating mode, and when the defrosting control condition is met for 4 times, the first valve element F1 and the third valve element F3 are controlled to be closed, the second valve element F2 and the fourth valve element F4 are controlled to be opened, the air conditioner 10 is controlled to be switched from the heating mode to the cooling mode for defrosting, the heating mode is performed after defrosting is finished, and the above process is repeated, so that the defrosting effect is improved, and the user experience is improved.
Fig. 6 is a functional block diagram of a defrosting control device 300 according to an embodiment of the present invention. It should be noted that the basic principle and the technical effects of the defrosting control device 300 provided in the present embodiment are the same as those of the foregoing method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the foregoing method embodiments for the parts that are not mentioned in the present embodiment. The defrosting control device 300 can be applied to the above controller, and includes a determining module 310 and a control module 320.
The determining module 310 is configured to determine whether the air conditioner 10 meets the defrosting control condition according to the detected outdoor environment temperature, the defrosting temperature, and the operation time of the compressor 102 in the heating mode.
Optionally, the determining module 310 is specifically configured to determine that the air conditioner 10 meets the defrosting control condition when the outdoor environment temperature is less than or equal to a sixth preset temperature and the duration is greater than a third preset time, the continuous operation time of the compressor 102 is greater than a fourth preset time or the accumulated operation time of the compressor 102 is greater than a fifth preset time, the defrosting temperature is less than a seventh preset temperature and the duration is greater than the sixth preset time.
It is understood that the determining module 310 can execute the above step S101.
The control module 320 is configured to control the second valve element F2 and the fourth valve element F4 to close and the first valve element F1 and the third valve element F3 to open when the air conditioner 10 meets the defrosting control condition, so that a portion of the refrigerant in the exhaust pipe 103 enters the indoor heat exchanger 201 through the four-way valve 101, and another portion of the refrigerant enters the outdoor heat exchanger 104 through the first valve element F1 and the second inlet pipe 1052.
Optionally, the control module 320 is further configured to adjust the opening degree of the first valve element F1 according to the defrosting temperature after the first valve element F1 is opened.
The control module 320 is specifically configured to control the opening degree of the first valve element F1 to increase when the defrosting temperature is less than or equal to a first preset temperature; when the defrosting temperature is higher than a first preset temperature and lower than or equal to a second preset temperature, controlling the opening degree of the first valve element F1 to be kept unchanged; when the defrosting temperature is higher than the second preset temperature and lower than or equal to a third preset temperature, controlling the opening degree of the first valve element F1 to be reduced; when the defrosting temperature is higher than the third preset temperature and the duration time is longer than the first preset time, if the collecting temperature of the preset collecting point of the outdoor heat exchanger 104 is higher than the fourth preset temperature, the first valve element F1 is controlled to be closed.
Optionally, the control module 320 may be further configured to control the third valve element F3 to close and the second valve element F2 and the fourth valve element F4 to open after the closing time of the first valve element F1 reaches a second preset time; when the coil temperature of the indoor unit heat exchanger 201 is detected to be higher than the fifth preset temperature, the inner fan 202 of the air conditioner 10 is controlled to operate at the set wind speed, and the defrosting control is exited.
Optionally, the control module 320 may be further configured to control the inner fan 202 of the air conditioner 10 to reduce the wind speed when the air conditioner 10 meets the defrosting control condition.
Optionally, the control module 320 may be further configured to control the external fan 111 of the air conditioner 10 to stop operating or reduce the wind speed of the external fan 111 to a preset value when the air conditioner 10 meets the defrosting control condition.
Alternatively, the control module 320 may be further configured to control the first valve element F1 and the third valve element F3 to close and the second valve element F2 and the fourth valve element F4 to open when the air conditioner 10 continuously meets the defrosting control condition in the heating mode more than a preset number of times, and simultaneously control the air conditioner 10 to switch from the heating mode to the cooling mode.
It is understood that the control module 320 can execute the steps S102, S103, S104, S105 and S106.
In summary, in the defrosting control method, the defrosting control device, and the air conditioner provided in the embodiments of the present invention, the exhaust pipe of the compressor is not only connected to the four-way valve through the first connection point, but also connected to the second inlet pipe of the outdoor heat exchanger through the first connection point and the first connection pipe, the inlet pipe of the outdoor heat exchanger is divided into the first inlet pipe and the second inlet pipe, the outlet pipe of the outdoor heat exchanger is also divided into the first outlet pipe and the second outlet pipe, the first inlet pipe is communicated with the first outlet pipe, and the second inlet pipe is communicated with the second outlet pipe, which respectively correspond to part of the heat exchange area on the outdoor heat exchanger. When the air conditioner accords with defrosting control conditions in a heating mode, the first valve element and the third valve element are opened, and the second valve element and the fourth valve element are closed, so that part of refrigerant in the exhaust pipe enters the indoor unit heat exchanger through the four-way valve, and the other part of refrigerant enters the outdoor unit heat exchanger through the first valve element and the second inlet pipe, so that the part of the outdoor unit heat exchanger communicated with the first inlet pipe and the first outlet pipe can be normally heated and operated, the indoor unit of the air conditioner does not need to be stopped, the part of the outdoor unit heat exchanger communicated with the second inlet pipe and the second outlet pipe can be cooled and operated, the defrosting of the outdoor unit is carried out, the effect that the indoor unit is not stopped to defrost is achieved, the problems that noise is caused by frequent starting and stopping of the indoor unit in the existing defrosting process and the heating cannot be carried out during defrosting are effectively solved, and.
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 (12)
1. A defrosting control method is applied to an air conditioner (10), and is characterized in that the air conditioner (10) comprises an outdoor heat exchanger (104), an indoor heat exchanger (201), a four-way valve (101) and a compressor (102), wherein an inlet pipe (105) of the outdoor heat exchanger (104), the indoor heat exchanger (201) and an exhaust pipe (103) of the compressor (102) are all connected with the four-way valve (101), the inlet pipe (105) of the outdoor heat exchanger (104) comprises a first inlet pipe (1051) and a second inlet pipe (1052), an outlet pipe (107) of the outdoor heat exchanger (104) comprises a first outlet pipe (1071) and a second outlet pipe (1072), the first inlet pipe (1051) is communicated with the first outlet pipe (1071), the second inlet pipe (1052) is communicated with the second outlet pipe (1072), and the first outlet pipe (1071) is connected with the indoor heat exchanger (201), the second outlet pipe (1072) is connected with an air return pipe (106) of the compressor (102), a first connection point (L1) is arranged on the exhaust pipe (103), a second connection point (L2) is arranged on the second inlet pipe (1052), a first connection pipe (109) is arranged between the first connection point (L1) and the second connection point (L2), a first valve member (F1) is arranged on the first connection pipe (109), a third connection point (L3) is arranged on the first inlet pipe (1051), one end of the second inlet pipe (1052) is connected with the third connection point (L3), a second valve member (F2) is arranged on the second inlet pipe (1052), and the second valve member (F2) is arranged between the second connection point (L2) and the third connection point (L3), a fourth connection point (L4) is arranged on the first outlet pipe (1071), and a fifth connection point (L5) is arranged on the second inlet pipe (1072), a third valve (F3) is arranged on the second outlet pipe (1072), the third valve (F3) is arranged between the fifth connection point (L5) and the air return pipe (106), a second connection pipe (110) is arranged between the fourth connection point (L4) and the fifth connection point (L5), and a fourth valve (F4) is arranged on the second connection pipe (110); the method comprises the following steps:
in the heating mode, judging whether the air conditioner (10) meets defrosting control conditions or not according to the detected outdoor environment temperature, defrosting temperature and the running time of the compressor (102);
when the air conditioner (10) meets the defrosting control condition, the second valve element (F2) and the fourth valve element (F4) are controlled to be closed, the first valve element (F1) and the third valve element (F3) are controlled to be opened, so that a part of refrigerant in the exhaust pipe (103) enters the indoor unit heat exchanger (201) through the four-way valve (101), and the other part of refrigerant enters the outdoor unit heat exchanger (104) through the first valve element (F1) and the second inlet pipe (1052);
adjusting an opening degree of the first valve element (F1) according to the defrosting temperature after the first valve element (F1) is opened; when the defrosting temperature is higher than a third preset temperature and the duration time is longer than a first preset time, if the collecting temperature of a preset collecting point of the outdoor heat exchanger (104) is higher than a fourth preset temperature, controlling the first valve element (F1) to be closed; after the closing time of the first valve piece (F1) reaches a second preset time, controlling the third valve piece (F3) to be closed, and controlling the second valve piece (F2) and the fourth valve piece (F4) to be opened; and when the temperature of the coil of the heat exchanger (201) of the indoor unit is detected to be higher than a fifth preset temperature, controlling an inner fan (202) of the air conditioner (10) to operate at a set air speed, and exiting from defrosting control.
2. The method according to claim 1, wherein said step of adjusting the opening degree of said first valve member (F1) according to said defrosting temperature comprises:
and when the defrosting temperature is lower than or equal to a first preset temperature, controlling the opening degree of the first valve element (F1) to increase.
3. The method according to claim 1, wherein said step of adjusting the opening degree of said first valve member (F1) according to said defrosting temperature comprises:
and when the defrosting temperature is higher than a first preset temperature and lower than or equal to a second preset temperature, controlling the opening degree of the first valve element (F1) to be kept unchanged.
4. The method according to claim 1, wherein said step of adjusting the opening degree of said first valve member (F1) according to said defrosting temperature comprises:
and when the defrosting temperature is higher than the second preset temperature and lower than or equal to a third preset temperature, controlling the opening degree of the first valve element (F1) to be reduced.
5. The method of claim 1, further comprising:
and when the air conditioner (10) meets the defrosting control condition, controlling an internal fan (202) of the air conditioner (10) to reduce the wind speed to operate.
6. The method of claim 1, further comprising:
and when the air conditioner (10) meets the defrosting control condition, controlling an outer fan (111) of the air conditioner (10) to stop running or reducing the wind speed of the outer fan (111) to a preset value.
7. The method of claim 1, wherein the step of determining whether the air conditioner (10) meets a defrosting control condition according to the detected outdoor ambient temperature, defrosting temperature, and operating time of the compressor (102) comprises:
and when the outdoor environment temperature is less than or equal to a sixth preset temperature and the duration is greater than a third preset time, the continuous operation time of the compressor (102) is greater than a fourth preset time or the accumulated operation time of the compressor (102) is greater than a fifth preset time, the defrosting temperature is less than a seventh preset temperature and the duration is greater than the sixth preset time, determining that the air conditioner (10) meets defrosting control conditions.
8. The method according to any one of claims 1-7, further comprising:
when the air conditioner (10) continuously meets the defrosting control condition in the heating mode for more than a preset number of times, controlling the first valve element (F1) and the third valve element (F3) to be closed, and controlling the second valve element (F2) and the fourth valve element (F4) to be opened, and simultaneously controlling the air conditioner (10) to be switched from the heating mode to the cooling mode.
9. A defrosting control device applied to an air conditioner (10), wherein the air conditioner (10) comprises an outdoor heat exchanger (104), an indoor heat exchanger (201), a four-way valve (101) and a compressor (102), an inlet pipe (105) of the outdoor heat exchanger (104), the indoor heat exchanger (201) and an exhaust pipe (103) of the compressor (102) are all connected with the four-way valve (101), the inlet pipe (105) of the outdoor heat exchanger (104) comprises a first inlet pipe (1051) and a second inlet pipe (1052), an outlet pipe (107) of the outdoor heat exchanger (104) comprises a first outlet pipe (1071) and a second outlet pipe (1072), the first inlet pipe (1051) is communicated with the first outlet pipe (1071), the second inlet pipe (1052) is communicated with the second outlet pipe (1072), and the first outlet pipe (1071) is connected with the indoor heat exchanger (201), the second outlet pipe (1072) is connected with an air return pipe (106) of the compressor (102), a first connection point (L1) is arranged on the exhaust pipe (103), a second connection point (L2) is arranged on the second inlet pipe (1052), a first connection pipe (109) is arranged between the first connection point (L1) and the second connection point (L2), a first valve member (F1) is arranged on the first connection pipe (109), a third connection point (L3) is arranged on the first inlet pipe (1051), one end of the second inlet pipe (1052) is connected with the third connection point (L3), a second valve member (F2) is arranged on the second inlet pipe (1052), and the second valve member (F2) is arranged between the second connection point (L2) and the third connection point (L3), a fourth connection point (L4) is arranged on the first outlet pipe (1071), and a fifth connection point (L5) is arranged on the second inlet pipe (1072), a third valve (F3) is arranged on the second outlet pipe (1072), the third valve (F3) is arranged between the fifth connection point (L5) and the air return pipe (106), a second connection pipe (110) is arranged between the fourth connection point (L4) and the fifth connection point (L5), and a fourth valve (F4) is arranged on the second connection pipe (110); the device comprises:
a judging module (310) for judging whether the air conditioner (10) meets defrosting control conditions according to the detected outdoor environment temperature, defrosting temperature and the running time of the compressor (102) in the heating mode;
a control module (320) for controlling the second valve element (F2) and the fourth valve element (F4) to be closed and the first valve element (F1) and the third valve element (F3) to be opened when the air conditioner (10) meets a defrosting control condition, so that a part of refrigerant in the exhaust pipe (103) enters the indoor heat exchanger (201) through the four-way valve (101), and another part of refrigerant enters the outdoor heat exchanger (104) through the first valve element (F1) and the second inlet pipe (1052);
the control module (320) is further used for adjusting the opening degree of the first valve element (F1) according to the defrosting temperature after the first valve element (F1) is opened; when the defrosting temperature is higher than a third preset temperature and the duration time is longer than a first preset time, if the collecting temperature of a preset collecting point of the outdoor heat exchanger (104) is higher than a fourth preset temperature, controlling the first valve element (F1) to be closed; after the closing time of the first valve piece (F1) reaches a second preset time, controlling the third valve piece (F3) to be closed, and controlling the second valve piece (F2) and the fourth valve piece (F4) to be opened; and when the temperature of the coil of the heat exchanger (201) of the indoor unit is detected to be higher than a fifth preset temperature, controlling an inner fan (202) of the air conditioner (10) to operate at a set air speed, and exiting from defrosting control.
10. An air conditioner, comprising an outdoor heat exchanger (104), an indoor heat exchanger (201), a four-way valve (101), a compressor (102), and a controller, wherein an inlet pipe (105) of the outdoor heat exchanger (104), the indoor heat exchanger (201), and an exhaust pipe (103) of the compressor (102) are connected to the four-way valve (101), the inlet pipe (105) of the outdoor heat exchanger (104) comprises a first inlet pipe (1051) and a second inlet pipe (1052), the outlet pipe (107) of the outdoor heat exchanger (104) comprises a first outlet pipe (1071) and a second outlet pipe (1072), the first inlet pipe (1051) and the first outlet pipe (1071) are communicated, the second inlet pipe (1052) and the second outlet pipe (1072) are communicated, the first outlet pipe (1071) is connected to the indoor heat exchanger (201), and the second outlet pipe (1072) is connected to the exhaust pipe (106) of the compressor (102), be equipped with first connecting point (L1) on blast pipe (103), be equipped with second connecting point (L2) on second advance pipe (1052), first connecting point (L1) with be equipped with first connecting pipe (109) between second connecting point (L2), be equipped with first valve member (F1) on first connecting pipe (109), be equipped with third connecting point (L3) on first advance pipe (1051), the second advance the one end of pipe (1052) with third connecting point (L3) is connected, be equipped with second valve member (F2) and second valve member (F2) set up in second connecting point (L2) with between third connecting point (L3) on the second advance pipe (1071), be equipped with fourth connecting point (L4) on first exit tube (1071), be equipped with fifth connecting point (L5) on second exit tube (1072), be equipped with third valve member (F3) and third connecting point (F3) and fifth exit tube (5) set up in second exit tube (1072) the third connecting point (F3) and fifth exit tube (5) the L5) the air return pipe (L5) is equipped with the exhaust tube (5) (106) -a second connection line (110) is provided between the fourth connection point (L4) and the fifth connection point (L5), -a fourth valve element (F4) is provided on the second connection line (110), -the controller executes a computer program to perform the method according to any of claims 1-8.
11. The air conditioner according to claim 10, wherein a check valve (115) is disposed between the return pipe (106) of the compressor (102) and the four-way valve (101), and the check valve (115) is configured to prevent the refrigerant flowing out of the second outlet pipe (1072) from flowing back to the four-way valve (101).
12. The air conditioner as claimed in claim 10, wherein an end of the outdoor heat exchanger (104) is connected to the second outlet pipe (1072).
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| CN110579014B (en) * | 2019-09-03 | 2021-05-25 | 青岛海信日立空调系统有限公司 | Heat exchange device and control method and control device thereof |
| CN112696839B (en) * | 2019-10-18 | 2022-12-27 | 广东美的制冷设备有限公司 | Air conditioning system, air conditioner and control method and control device of air conditioner |
| CN110940055B (en) * | 2019-12-16 | 2021-10-22 | 宁波奥克斯电气股份有限公司 | Heating and defrosting control method and device for air conditioner and air conditioner |
| CN111059700B (en) * | 2019-12-24 | 2021-01-15 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device and air conditioner |
| CN111121230A (en) * | 2019-12-30 | 2020-05-08 | 宁波奥克斯电气股份有限公司 | Air conditioner defrosting control method and device and air conditioner |
| CN111219803A (en) * | 2020-01-09 | 2020-06-02 | 珠海格力电器股份有限公司 | Multi-split air conditioner and defrosting method thereof |
| CN111397237A (en) * | 2020-02-26 | 2020-07-10 | 浙江中广电器股份有限公司 | Air conditioner and control mode for realizing defrosting during heating |
| CN111397095B (en) * | 2020-03-27 | 2022-08-12 | 广东美的制冷设备有限公司 | Control method of air conditioner and air conditioner |
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