CN114992899B - Air conditioner and oil blocking prevention control method thereof - Google Patents
Air conditioner and oil blocking prevention control method thereof Download PDFInfo
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- CN114992899B CN114992899B CN202210651770.7A CN202210651770A CN114992899B CN 114992899 B CN114992899 B CN 114992899B CN 202210651770 A CN202210651770 A CN 202210651770A CN 114992899 B CN114992899 B CN 114992899B
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000002265 prevention Effects 0.000 title claims abstract description 27
- 230000000903 blocking effect Effects 0.000 title claims abstract description 26
- 239000003507 refrigerant Substances 0.000 claims abstract description 152
- 238000010438 heat treatment Methods 0.000 claims abstract description 58
- 239000003921 oil Substances 0.000 claims description 49
- 238000010257 thawing Methods 0.000 claims description 33
- 239000010687 lubricating oil Substances 0.000 claims description 19
- 239000002826 coolant Substances 0.000 claims description 9
- 238000004378 air conditioning Methods 0.000 abstract description 11
- 230000001276 controlling effect Effects 0.000 description 36
- 230000008569 process Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 9
- 239000007788 liquid Substances 0.000 description 8
- 238000004891 communication Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005338 heat storage Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000013526 supercooled liquid Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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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
-
- 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
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
-
- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/003—Filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
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- Combustion & Propulsion (AREA)
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- Human Computer Interaction (AREA)
- Fuzzy Systems (AREA)
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- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner and an oil blocking prevention control method thereof, wherein the air conditioner comprises the following components: the refrigerant circulation loop consists of a compressor, a four-way valve, an outdoor heat exchanger, a throttling device and an indoor heat exchanger; the first end of the bypass pipeline which can be opened and closed is connected to a connecting pipeline between the four-way valve and the indoor heat exchanger, and the second end of the bypass pipeline is connected to a connecting pipeline between the indoor heat exchanger and the throttling device; the controller is used for: responding to a heating instruction, and controlling the refrigerant circulation loop to convey a refrigerant according to the heating refrigerant flow direction; and periodically controlling the bypass pipeline to be opened for a preset time period until the opening times of the bypass pipeline reach the preset times. By adopting the embodiment of the invention, the oil plug at the throttling device in the refrigerant circulation loop can be effectively dredged, so that the reliability of the air conditioning system is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and an oil blocking prevention control method thereof.
Background
Currently, flammable refrigerants such as R290 are widely used in air conditioning systems with their low global warming potential and almost pollution-free advantages. However, since the flammable refrigerant has combustibility and explosiveness, the filling amount of the flammable refrigerant in the air conditioning system is greatly limited, and in order to obtain a high heating amount, the air conditioning system generally adopts a method of increasing the discharge amount of the compressor to obtain the heating amount. Under extremely low combustible refrigerant filling amount and higher compressor exhaust amount, throttling abnormal phenomenon is easily caused in the initial starting stage of an air conditioning system under a low-temperature working condition, and in the process of heating and starting, the compressor lubricating oil is easy to generate floccules to block a throttling device to cause oil blockage, so that the combustible refrigerant and the lubricating oil cannot return to the compressor, the compressor idles, and the operation reliability of the combustible refrigerant air conditioning system is seriously threatened.
Disclosure of Invention
The embodiment of the invention provides an air conditioner and an oil blockage prevention control method thereof, which can effectively dredge oil blockage at a throttling device in a refrigerant circulation loop, thereby improving the reliability of an air conditioning system.
An air conditioner provided in a first embodiment of the present invention includes:
the refrigerant circulation loop consists of a compressor, a four-way valve, an outdoor heat exchanger, a throttling device and an indoor heat exchanger;
the first end of the bypass pipeline which can be opened and closed is connected to a connecting pipeline between the four-way valve and the indoor heat exchanger, and the second end of the bypass pipeline is connected to a connecting pipeline between the indoor heat exchanger and the throttling device;
a controller for:
responding to a heating instruction, and controlling the refrigerant circulation loop to convey a refrigerant according to the heating refrigerant flow direction;
and periodically controlling the bypass pipeline to be opened for a preset time period until the opening times of the bypass pipeline reach the preset times.
In the air conditioner provided in the first embodiment of the present invention, when the controller receives the heating instruction, the bypass pipeline is controlled to be periodically opened, so that after the refrigerant gas is discharged from the compressor, the refrigerant gas can be directly conveyed to the throttling device through the bypass pipeline when being opened, so as to form a larger impact on the interior of the throttling device, and therefore, the oil blockage occurring at the throttling device can be effectively dredged, so as to improve the reliability of the air conditioning system.
In the air conditioner provided in the second embodiment of the present invention, the opening of the bypass line is periodically controlled for a preset period of time until the number of times of opening the bypass line reaches a preset number of times, specifically:
and when the working frequency of the compressor is detected to reach the preset frequency, periodically controlling the bypass pipeline to be opened for a preset time period until the opening times of the bypass pipeline reach the preset times.
In the air conditioner provided in the second embodiment of the present invention, when the controller receives the heating instruction, the controller waits for the working frequency of the compressor to reach the preset frequency, and then periodically controls the bypass pipeline to be opened, so that the compressor can be prevented from just entering the heating start mode, the working frequency of the compressor is unstable, and the discharge of the refrigerant gas is affected, so that the oil blockage at the throttle device cannot be dredged, thereby further ensuring the oil blockage prevention effect during the heating operation of the air conditioner.
The air conditioner provided in the third embodiment of the present invention further includes: an indoor coil pipe temperature acquisition device; wherein,,
the indoor coil temperature acquisition device is used for detecting the coil temperature of the indoor heat exchanger;
the controller is further configured to:
responding to a defrosting instruction, and controlling the refrigerant circulation loop to convey the refrigerant according to the defrosting refrigerant flow direction;
and acquiring the coil temperature, and controlling the bypass pipeline to be opened when the coil temperature is detected to be smaller than or equal to the preset pour point temperature of lubricating oil, until the coil temperature is detected to be larger than or equal to the sum of the pour point temperature and the preset temperature, and controlling the bypass pipeline to be closed.
In the air conditioner provided in the third embodiment of the invention, since the bypass pipeline is connected in parallel with the indoor heat exchanger, when the controller receives a defrosting instruction and detects that the coil temperature of the indoor heat exchanger is less than or equal to the preset pour point temperature of lubricating oil, the bypass pipeline is controlled to be opened, so that refrigerant can flow back to the compressor through the bypass pipeline, further, the coil temperature of the indoor heat exchanger is prevented from continuously reducing to cause oil blockage, meanwhile, the normal operation of refrigerant circulation during defrosting can be ensured, and when the coil temperature of the indoor heat exchanger is detected to be greater than or equal to the sum of the pour point temperature and the preset temperature, namely, the temperature of the indoor heat exchanger is detected to be raised, the bypass pipeline is controlled to be closed, thereby preventing the bypass pipeline from being opened for a long time to cause the suction liquid of the compressor, and meanwhile, the heat of the indoor heat exchanger body can be recovered again to defrost.
The air conditioner provided in the fourth embodiment of the present invention further comprises a power component;
the bypass line specifically includes:
the first end of the switch valve is a first end of the bypass pipeline and is used for being opened or closed under the control of the controller;
the radiator is arranged below the power component, the first end of the radiator is connected with the second end of the switch valve, the second end of the radiator is the second end of the bypass pipeline, and the radiator is used for exchanging heat with the power component through the coolant flowing in the bypass pipeline.
In the air conditioner provided in the fourth embodiment of the present invention, since the bypass line is provided with the radiator for exchanging heat with the power component through the coolant flowing in the bypass line, when the bypass line is opened, the refrigerant passing through the radiator can recover heat generated by the power component for defrosting the outdoor heat exchanger. Meanwhile, the refrigerant passing through the radiator can cool the power components, so that the stable operation of the power components of the air conditioner is ensured.
The air conditioner provided in the fifth embodiment of the present invention, wherein the radiator specifically includes:
the base comprises a heat absorbing surface and a heat radiating surface, wherein the heat absorbing surface is used for being connected with the power component;
the refrigerant coil pipe is arranged in the base, the first end of the refrigerant coil pipe is the first end of the radiator, and the second end of the refrigerant coil pipe is the second end of the radiator;
and the fins are arranged on the radiating surface and are used for increasing the radiating area.
In the air conditioner provided in the fifth embodiment of the present invention, since the refrigerant coil is provided in the radiator, when the refrigerant flows through the refrigerant coil, the radiator and the power component can be cooled reversely, and heat is recovered from the power component for defrosting the outdoor heat exchanger. In addition, as the radiating surface of the radiator is provided with the ribs, the radiating area of the radiator can be further increased, so that the stable operation of the power components connected with the radiator is ensured.
The oil blocking prevention control method for an air conditioner provided in a sixth embodiment of the present invention is applied to the air conditioner described in any one of the above embodiments, and is executed by a controller; the method comprises the following steps:
responding to a heating instruction, and controlling the refrigerant circulation loop to convey a refrigerant according to the heating refrigerant flow direction;
and periodically controlling the bypass pipeline to be opened for a preset time period until the opening times of the bypass pipeline reach the preset times.
In the oil blockage prevention control method for the air conditioner provided by the sixth embodiment of the invention, when the controller receives a heating instruction, the bypass pipeline is controlled to be periodically opened, so that after refrigerant gas is discharged from the compressor, the refrigerant gas can be directly conveyed to the throttling device through the bypass pipeline when being opened, so that a large impact is formed on the inside of the throttling device, and therefore, the oil blockage generated at the throttling device can be effectively dredged, and the reliability of an air conditioning system is improved.
According to the oil blocking prevention control method for the air conditioner provided in the seventh embodiment of the present invention, the opening of the bypass line is periodically controlled for a preset period of time until the opening times of the bypass line reach a preset number of times, specifically:
and when the working frequency of the compressor is detected to reach the preset frequency, periodically controlling the bypass pipeline to be opened for a preset time period until the opening times of the bypass pipeline reach the preset times.
In the oil blocking prevention control method for the air conditioner provided by the seventh embodiment of the invention, when the controller receives a heating instruction, the controller waits for the working frequency of the compressor to reach the preset frequency and then periodically controls the bypass pipeline to be opened, so that the phenomenon that the oil blocking at the throttle device cannot be dredged due to unstable working frequency of the compressor which influences the discharge of refrigerant gas can be prevented, and the oil blocking prevention effect of the air conditioner during heating operation is further ensured.
The oil blocking prevention control method for the air conditioner provided in the eighth embodiment of the invention, wherein the method further comprises the following steps:
responding to a defrosting instruction, and controlling the refrigerant circulation loop to convey the refrigerant according to the defrosting refrigerant flow direction;
and acquiring the coil temperature of the indoor heat exchanger, and controlling the bypass pipeline to be opened when the coil temperature is detected to be smaller than or equal to the preset pour point temperature of lubricating oil, until the coil temperature is detected to be larger than or equal to the sum of the pour point temperature and the preset temperature, and controlling the bypass pipeline to be closed.
According to the oil blocking prevention control method for the air conditioner, provided by the eighth embodiment of the invention, when the controller receives a defrosting instruction and detects that the coil temperature of the indoor heat exchanger is smaller than or equal to the preset pour point temperature of lubricating oil, the bypass pipeline is controlled to be opened, so that refrigerant can flow back to the compressor through the bypass pipeline, the coil temperature of the indoor heat exchanger is prevented from being continuously reduced to cause oil blocking, normal operation of refrigerant circulation during defrosting can be ensured, and when the coil temperature of the indoor heat exchanger is detected to be larger than or equal to the sum of the pour point temperature and the preset temperature, namely, the temperature of the indoor heat exchanger is detected to be raised, the bypass pipeline is controlled to be closed, thereby preventing the bypass pipeline from being opened for a long time to cause liquid suction of the compressor, and meanwhile, the heat storage of the indoor heat exchanger body can be recovered again to perform frost.
Drawings
Fig. 1 is a schematic structural diagram of a refrigerant circulation circuit of a first air conditioner according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a circuit structure of an air conditioner according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a refrigerant circulation circuit of a second air conditioner according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a heat sink according to an embodiment of the invention.
Fig. 5 is a schematic structural diagram of a refrigerant circulation circuit of a third air conditioner according to another embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a refrigerant circulation circuit of a fourth air conditioner according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a complete machine structure of an air conditioner according to an embodiment of the present invention.
Fig. 8 is a flowchart illustrating a heating start-up phase of a controller of an air conditioner according to an embodiment of the present invention.
Fig. 9 is another operation flow chart of a heating start stage of a controller of an air conditioner according to an embodiment of the present invention.
FIG. 10 is a flowchart illustrating a defrosting process of a controller of an air conditioner according to an embodiment of the present invention;
fig. 11 is a schematic flow chart of an oil blocking prevention control method for an air conditioner according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Referring to fig. 1, a schematic diagram of a refrigerant circulation circuit of a first air conditioner according to an embodiment of the invention is shown.
The air conditioner 100 provided in the embodiment of the invention includes:
the refrigerant circulation loop consists of a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttling device 4 and an indoor heat exchanger 5;
a bypass line 6 which is openable and closable, a first end of which is connected to a connection line between the four-way valve 2 and the indoor heat exchanger 5, and a second end of which is connected to a connection line between the indoor heat exchanger 5 and the throttle device 4;
a controller 60 for:
responding to a heating instruction, and controlling the refrigerant circulation loop to convey a refrigerant according to the heating refrigerant flow direction;
and periodically controlling the bypass pipeline 6 to be opened for a preset time period until the opening times of the bypass pipeline 6 reach the preset times.
Referring to fig. 1, specifically, in the refrigerant circulation circuit, the discharge port of the compressor 1 is connected to the first end of the four-way valve 2, the second end of the four-way valve 2 is connected to the first end of the throttle device 4 through the outdoor heat exchanger 3, the second end of the throttle device 4 is connected to the third end of the four-way valve 2 through the indoor heat exchanger 5, and the fourth end of the four-way valve 2 is connected to the suction port of the compressor 1.
It should be noted that, the circuit structure of the air conditioner provided in this embodiment is shown in fig. 2. In the refrigerant circulation circuit, the indoor heat exchanger 5 and the outdoor heat exchanger 3 function as a condenser or an evaporator. The outdoor heat exchanger 3 has a first inlet and outlet for flowing a refrigerant (refrigerant) between the outdoor heat exchanger and the suction port of the compressor 1, and has a second inlet and outlet for flowing a refrigerant between the outdoor heat exchanger and the throttle device 4. The outdoor heat exchanger 3 is configured to exchange heat between outdoor air and refrigerant flowing through a heat transfer pipe connected between a second inlet and a first inlet of the outdoor heat exchanger 3. The indoor heat exchanger 5 has a second inlet and outlet for allowing the liquid refrigerant to flow between the indoor heat exchanger and the throttle device 4, and a first inlet and outlet for allowing the gas refrigerant to flow between the indoor heat exchanger and the discharge port of the compressor 1. The indoor heat exchanger 5 is used for performing heat exchange between the indoor air and the refrigerant flowing in the heat transfer tube connected between the second inlet and the first inlet of the indoor heat exchanger 5. The expansion device 4 has a function of expanding and decompressing the refrigerant flowing between the outdoor heat exchanger 3 and the indoor heat exchanger 5. The throttle device 4 can be changed in opening degree by the controller 60, the flow path resistance of the refrigerant passing through the throttle device 4 is increased by decreasing the opening degree of the throttle device 4, and the flow path resistance of the refrigerant passing through the throttle device 4 is decreased by increasing the opening degree of the throttle device 4. Therefore, the expansion device 4 expands and decompresses the refrigerant flowing from the indoor heat exchanger 5 to the outdoor heat exchanger 3 during the heating operation. Even if the state of other devices mounted in the refrigerant circulation circuit is unchanged, when the opening degree of the throttle device 4 is changed, the flow rate of the refrigerant flowing in the refrigerant circulation circuit is changed. Further, a reservoir is disposed between the outdoor heat exchanger 3 and the suction port of the compressor 1. In the accumulator, the refrigerant flowing from the outdoor heat exchanger 3 to the compressor 1 is separated into a gas refrigerant and a liquid refrigerant, and the gas refrigerant is mainly supplied from the accumulator to the suction port of the compressor 1. The four-way valve 2 can change the state of the controller 60 to change the flow direction of the refrigerant in the refrigerant circulation circuit, thereby realizing the switching of the functions of cooling, heating or defrosting of the air conditioner 100. In addition, the bypass line 6 may be controlled by a switch regulated by the controller 60, which is not described herein.
Illustratively, the flow direction of the heating refrigerant of the air conditioner 100 is: the refrigerant gas is discharged from the compressor 1 and enters the indoor unit heat exchanger through the four-way valve 2, the refrigerant gas is condensed into supercooled liquid, then enters the outdoor heat exchanger 3 after being throttled by the throttling device 4, the liquid refrigerant absorbs heat to be gaseous refrigerant, and enters the compressor 1 through the four-way valve 2 to absorb air, so that the whole heating cycle is completed. Referring to fig. 1, in the present embodiment, an openable and closable bypass line 6 connected in parallel with the indoor heat exchanger 5 is disposed in the air conditioner 100, and when the bypass line 6 is opened, the exhaust gas of the compressor 1 can be directly delivered to the throttling device 4, on the one hand, the refrigerant gas discharged through the compressor 1 forms a large impact on the throttling device 4; on the other hand, the refrigerant gas discharged from the compressor 1 has a certain heat storage capacity, and can heat the throttling device 4 and the auxiliary pipeline thereof, so as to reduce the viscosity of the lubricating oil, enhance the fluidity of the lubricating oil, and effectively dredge the oil blockage at the throttling device 4.
As an example, referring to fig. 8, which is a flowchart illustrating a heating start-up phase of a controller of an air conditioner according to an embodiment of the present invention, a heating start-up phase control process of the controller 60 is specifically as follows: responding to the heating instruction, controlling a refrigerant circulation loop to convey a refrigerant according to the heating refrigerant flow direction (step S11); controlling the bypass line 6 to be opened and maintained for a preset period of time (step S12) to direct the exhaust gas of the compressor 1 to the front of the throttle device 4 for dredging the oil blockage which may occur; recording the number of times of opening the bypass line 6 (step S13); judging whether the opening times are smaller than the preset times (step S14), if yes, entering step S15, and if not, ending the oil blocking prevention control process in the heating starting process; whether the bypass line 6 is closed for a preset interval period is judged (step S15), if so, the flow returns to step S12 to dredge again, and if not, the monitoring is continued.
As an alternative embodiment, the periodically controlling the bypass line 6 to be opened for a preset period of time until the number of times of opening the bypass line 6 reaches a preset number of times is specifically:
when the working frequency of the compressor 1 is detected to reach a preset frequency, the bypass pipeline 6 is periodically controlled to be opened for a preset duration until the opening times of the bypass pipeline 6 reach a preset time.
In the air conditioner 100 provided in this embodiment, when the controller 60 receives the heating instruction, it waits for the working frequency of the compressor 1 to reach the preset frequency, and then periodically controls the bypass pipeline 6 to be opened, so that the compressor 1 can be prevented from just entering the heating start mode, the working frequency of the compressor 1 is unstable, and the discharge of the refrigerant gas is affected, so that the oil blockage at the throttle device 4 cannot be dredged, thereby further ensuring the oil blockage prevention effect during the heating operation of the air conditioner 100.
Further, the periodically controlling the bypass line 6 to be opened for a preset period of time is specifically: each time a period arrives, controlling the bypass pipeline 6 to be opened for a preset time period, and controlling the bypass pipeline 6 to be closed for a preset interval time period after the bypass pipeline 6 is opened for the preset time period; and the sum of the preset time length and the preset interval time length is a period value.
Preferably, the value range of the preset duration is as follows: 3-5 s; the value range of the preset interval duration is as follows: 40-60 s.
For example, in the actual control process, when the controller 60 receives a heating instruction, the air conditioner 100 enters a heating start stage, the controller 60 controls the throttle device 4 to be reset to an initial opening of heating, adjusts the state of the four-way valve 2, and starts the compressor 1, thereby controlling the refrigerant circulation loop to convey the refrigerant according to the flow direction of the heating refrigerant; then, detecting the working frequency of the compressor 1, when detecting that the working frequency of the compressor 1 reaches the preset frequency, controlling the bypass pipeline 6 to be opened for a preset period of time, directly leading the exhaust gas of the compressor 1 to the throttle device 4, dredging the oil blockage possibly occurring, and recording the opening times of the bypass pipeline 6 through a counter; when the opening times of the bypass pipeline 6 are smaller than or equal to the preset times, after the bypass pipeline 6 is controlled to be closed for a preset interval time, the bypass pipeline 6 is opened again to conduct second dredging, and the dredging of the bypass pipeline 6 is ended until the opening times of the bypass pipeline 6 reach the preset times, and the heating starting process is completed. It will be appreciated that the bypass line 6 should be in a closed state before the controller 60 periodically controls the bypass line 6 to be open for a preset period of time.
Referring to fig. 9, another working flow chart of a heating start stage of a controller of an air conditioner according to an embodiment of the present invention is shown, and a control process of another heating start stage of the controller 60 is specifically as follows: responding to the heating instruction, controlling a refrigerant circulation loop to convey a refrigerant according to the heating refrigerant flow direction (step S11); detecting whether the working frequency of the compressor 1 reaches a preset frequency (step S11'), if so, proceeding to step S12; controlling the bypass line 6 to be opened and maintained for a preset period of time (step S12) to direct the exhaust gas of the compressor 1 to the front of the throttle device 4 for dredging the oil blockage which may occur; recording the number of times of opening the bypass line 6 (step S13); judging whether the opening times are smaller than the preset times (step S14), if yes, entering step S15, and if not, ending the oil blocking prevention control process in the heating starting process; whether the bypass line 6 is closed for a preset interval period is judged (step S15), if so, the flow returns to step S12 to dredge again, and if not, the monitoring is continued.
In the present embodiment, the bypass line 6 may be opened or closed by an on-off valve, and the opening and closing of the bypass line 6 are not particularly limited.
Referring to fig. 3, further, the air conditioner 100 further includes: an indoor coil temperature acquisition device 7; wherein,,
the indoor coil temperature acquisition device 7 is used for detecting the coil temperature of the indoor heat exchanger 5;
the controller 60 is further configured to:
responding to a defrosting instruction, and controlling the refrigerant circulation loop to convey the refrigerant according to the defrosting refrigerant flow direction;
and acquiring the coil temperature, and controlling the bypass pipeline 6 to be opened when the coil temperature is detected to be smaller than or equal to the preset pour point temperature of lubricating oil, until the coil temperature is detected to be larger than or equal to the sum of the pour point temperature and the preset temperature, and controlling the bypass pipeline 6 to be closed.
In the air conditioner 100 provided in this embodiment, since the bypass pipeline 6 is connected in parallel with the indoor heat exchanger 5, when the controller 60 receives a defrosting instruction and detects that the coil temperature of the indoor heat exchanger 5 is less than or equal to the preset pour point temperature of lubricating oil, by controlling the bypass pipeline 6 to be opened, refrigerant can flow back to the compressor 1 through the bypass pipeline 6, thereby preventing the coil temperature of the indoor heat exchanger 5 from continuously decreasing to cause oil blockage, and at the same time, ensuring normal operation of refrigerant circulation during defrosting, and when detecting that the coil temperature of the indoor heat exchanger 5 is greater than or equal to the sum of the pour point temperature and the preset temperature, that is, when the temperature of the indoor heat exchanger 5 is raised, the bypass pipeline 6 is controlled to be closed, thereby preventing the bypass pipeline 6 from being opened for a long time to cause the suction of the compressor 1, and at the same time, heat of the body of the indoor heat exchanger 5 can be recovered again to defrost.
Illustratively, the defrost refrigerant flow direction of the air conditioner 100 is: the refrigerant gas is exhausted through the compressor 1, is reversed through the four-way valve 2 and enters the outdoor heat exchanger 3, the refrigerant condenses, releases heat and defrosts, the defrosted refrigerant enters the indoor heat exchanger 5 through the throttling device 4 to absorb heat, and then flows back to the compressor 1 through the four-way valve 2 to suck air, and the whole defrosting cycle is completed. However, in the defrosting process, the refrigerant continuously takes away the heat stored in the indoor heat exchanger 5, so that the temperature of the indoor heat exchanger 5 is continuously reduced, and when the temperature of the indoor heat exchanger 5 is reduced to the pour point temperature of the lubricating oil or below, the lubricating oil of the pipeline of the indoor heat exchanger 5, the throttling device 4 between the outdoor heat exchanger 3 and the indoor heat exchanger 5 and the accessory pipeline thereof is easily condensed, so that the oil is blocked. Therefore, referring to fig. 3, in the present embodiment, the bypass line 6 is connected in parallel with the indoor heat exchanger 5, when the heat accumulation of the indoor heat exchanger 5 is continuously taken away by the refrigerant, the evaporating temperature of the indoor heat exchanger 5 is continuously reduced, in order to prevent the coil temperature of the indoor heat exchanger 5 from being reduced to the pour point temperature of the lubricating oil or below and causing oil blockage, when the coil temperature is detected to be less than or equal to the preset pour point temperature of the lubricating oil, the bypass line 6 is controlled to be opened, the refrigerant can flow back to the four-way valve 2 through the bypass line 6, and after merging with the refrigerant flowing through the indoor heat exchanger 5, the refrigerant enters the compressor 1 through the four-way valve 2 to suck air, so as to ensure the normal operation of the refrigerant circulation when the air conditioner 100 is defrosted.
Preferably, the preset temperature is in a value range of 5-10 ℃.
It will be appreciated that when the coil temperature is detected to be greater than or equal to the sum of the pour point temperature and the predetermined temperature, this indicates that the indoor heat exchanger 5 has regained a certain amount of heat storage, and therefore the bypass line 6 may be closed to prevent the bypass line 6 from being opened for a long period of time, resulting in liquid refrigerant being entrained in the refrigerant gas absorbed by the compressor 1.
Referring to fig. 10, which is a flowchart illustrating a defrosting phase of a controller of an air conditioner according to an embodiment of the present invention, a defrosting phase control process of the controller 60 is specifically as follows: in response to the defrosting instruction, controlling the refrigerant circulation loop to convey the refrigerant according to the defrosting refrigerant flow direction (step S21); detecting the coil temperature of the indoor heat exchanger 5 (step S22); judging whether the coil temperature of the indoor heat exchanger 5 is less than or equal to the pour point temperature of lubricating oil (step S23), if so, entering step S24; the bypass pipeline 6 is controlled to be opened (step S24), at the moment, the pipeline of the indoor heat exchanger 5 is connected with the bypass pipeline 6 in parallel, and part of refrigerant passes through the radiator through the bypass pipeline 6 to recover the heating value of the power components; detecting whether the coil temperature of the indoor heat exchanger 5 is greater than or equal to the sum of the pour point temperature and the preset temperature (step S25), if so, entering step S26 when the temperature of the indoor heat exchanger 5 is informed of regaining a certain heat storage amount, and if not, continuing to detect; the bypass line 6 is controlled to be closed (step S26) to prevent the bypass line 6 from being opened for a long time to cause the suction of the compressor 1 to carry liquid.
It is worth to say that the existing method for improving the air-conditioner oil plug mainly comprises the following steps: the refrigerant filling amount is increased, the oil blockage position is melted by resistance heating, the working frequency of the compressor is changed, the opening of the electronic expansion valve is preset to be increased, and the like. In the existing method for improving the air-conditioning oil blockage, the increase of the refrigerant filling amount causes higher safety risk, and is not suitable for flammable refrigerants; the heating efficiency is low in a mode of heating the melted oil plug position by resistance, the heating speed is low, and the user experience under the low-temperature heating working condition is seriously influenced; preventive measures such as changing the working frequency of the compressor are required to be high in reliability of a control system, and the compressor is easy to fail under extreme working conditions so as to cause machine shutdown; the oil blockage can be effectively relieved or eliminated by presetting and increasing the opening of the electronic expansion valve, but the compressor is easy to suck air and carry liquid, so that the safe operation of the compressor is threatened. In contrast, the air conditioner 100 provided by the embodiment of the invention has the advantages of simple control process, no need of higher requirements on the reliability of a control system, fewer design sensors, low cost and suitability for room air conditioners.
Further, the air conditioner 100 further includes a power component 13. Referring to fig. 3, the bypass line 6 specifically includes:
a switching valve 8, a first end of the switching valve 8 is a first end of the bypass line 6, and is used for being opened or closed under the control of the controller 60;
the radiator 9 is arranged below the power component 13, a first end of the radiator 9 is connected with a second end of the switch valve 8, the second end of the radiator 9 is a second end of the bypass pipeline 6, and the radiator 9 is used for performing heat exchange with the power component 13 through coolant flowing in the bypass pipeline 6.
In the air conditioner 100 provided in this embodiment, since the bypass line 6 is provided with the radiator 9 for exchanging heat with the power component 13 through the coolant flowing in the bypass line 6, when the bypass line 6 is opened, the refrigerant passing through the radiator 9 can recover the heat generated by the power component 13 for defrosting the outdoor heat exchanger 3. Meanwhile, the cooling medium passing through the radiator 9 can cool the power components 13, so as to ensure the stable operation of the power components 13 of the air conditioner 100.
Specifically, the power component 13 includes: intelligent power module, power factor correction module and insulated gate bipolar transistor.
It can be understood that when the air conditioner 100 enters the defrosting mode, the fans of the indoor heat exchanger 5 and the outdoor heat exchanger 3 stop running, and the power components 13 continuously generate heat, so that when the bypass pipeline 6 is opened, the coolant flowing in the bypass pipeline 6 can exchange heat with the power components 13, and on one hand, the coolant can recover the heat generation amount of the power components 13 for defrosting the outdoor heat exchanger 3; on the other hand, the coolant can cool down the radiator 9 and the power element 13 to ensure stable operation of the radiator 9 and the power element 13.
Referring to fig. 4, as one of the alternative embodiments, the heat sink 9 specifically includes:
the base comprises a heat absorbing surface and a heat radiating surface, wherein the heat absorbing surface is used for being connected with the power component 13;
a refrigerant coil 10 disposed in the base, a first end of the refrigerant coil being a first end of the radiator 9, and a second end of the refrigerant coil being a second end of the radiator 9;
and ribs 14 provided on the heat radiating surface for increasing a heat radiating area.
In the air conditioner 100 provided in this embodiment, since the refrigerant coil 10 is provided in the radiator 9, when the refrigerant flows through the refrigerant coil 10, the radiator 9 and the power component 13 can be reversely cooled, and heat is recovered from the power component 13 to defrost the outdoor heat exchanger 3. In addition, since the radiating surface of the radiator 9 is provided with the ribs 14, the radiating area of the radiator 9 can be further increased to ensure stable operation of the power component 13 connected with the radiator 9.
Referring to fig. 5, further, the refrigerant circulation circuit further includes: a first filter 12 and a second filter 11; wherein,,
the first filter 12 is connected to a connection line between the throttle device 4 and the outdoor heat exchanger 3;
the second filter 11 is connected to a connection line between the throttle device 4 and the indoor heat exchanger 5.
In this embodiment, by providing the first filter 12 and the second filter 11, moisture in the refrigerant can be absorbed and impurities can be blocked, so that the refrigerant can not pass through the filter, and the pipeline is further prevented from being blocked, thereby affecting normal operation.
Referring to fig. 6, further, the air conditioner 100 further includes: an outdoor coil temperature acquisition device 15; wherein,,
the outdoor coil temperature acquisition device 15 is used for detecting the coil temperature of the outdoor heat exchanger 3.
Wherein the coil temperature of the outdoor heat exchanger 3 is used to determine whether a defrost mode is to be entered.
Referring to fig. 6, preferably, the on-off valve 8 is a solenoid valve, and the throttle device 4 is an electronic expansion valve. The throttle device 4 may be any throttle device such as a capillary tube, other than an electronic expansion valve, and is not particularly limited.
Referring to fig. 7, a schematic diagram of a complete machine structure of an air conditioner according to an embodiment of the present invention is shown. The air conditioner 100 of the present invention includes an indoor unit 30, which is typically mounted on an indoor wall surface WL or the like, taking an indoor unit (shown in the drawing) as an example. For another example, an indoor unit (not shown) is also an indoor unit of the indoor unit 30. The indoor heat exchanger 5 and the indoor coil temperature acquisition device 7 are located in the indoor unit 30. The air conditioner 100 further includes an outdoor unit 20; the outdoor unit 20 is typically disposed outdoors for heat exchange in an indoor environment. In fig. 7, the outdoor unit 20 is shown by a broken line, since the outdoor unit 20 is located outdoors on the opposite side of the indoor unit 30 across the wall surface WL. As shown in fig. 7, a remote controller 50 is attached to the air conditioner 100, and the remote controller 50 has a liquid crystal display device 5a and buttons 5b shown in fig. 7, and the remote controller 50 has a function of communicating with the controller 60 using, for example, infrared rays or other communication means. The remote controller 50 is used for various controls that a user can control the air conditioner 100, and interaction between the user and the air conditioner 100 is achieved.
Referring to fig. 11, a flow chart of an oil blocking prevention control method for an air conditioner according to an embodiment of the invention is shown.
The oil blocking prevention control method of the air conditioner provided in the present embodiment is applied to the air conditioner 100 described in any one of the above embodiments, and is executed by the controller 60; the method comprises the following steps:
s1, responding to a heating instruction, and controlling the refrigerant circulation loop to convey a refrigerant according to the flow direction of the heating refrigerant;
s2, periodically controlling the bypass pipeline to be opened for a preset time period until the opening times of the bypass pipeline reach the preset times.
In the oil blockage prevention control method for the air conditioner provided by the embodiment, when the controller receives the heating instruction, the bypass pipeline is controlled to be periodically opened, so that after the refrigerant gas is discharged by the compressor, the refrigerant gas can be directly conveyed to the throttling device through the bypass pipeline when being opened, so that a large impact is formed on the inside of the throttling device, and therefore, the oil blockage generated at the throttling device can be effectively dredged, and the reliability of an air conditioning system is improved.
As an optional implementation manner, in step S2, the step of periodically controlling the bypass line to be opened for a preset period of time until the number of times of opening the bypass line reaches a preset number of times specifically includes:
and when the working frequency of the compressor is detected to reach the preset frequency, periodically controlling the bypass pipeline to be opened for a preset time period until the opening times of the bypass pipeline reach the preset times.
In the oil blocking prevention control method for the air conditioner provided by the embodiment, when the controller receives the heating instruction, the controller waits for the working frequency of the compressor to reach the preset frequency and then periodically controls the bypass pipeline to be opened, so that the compressor can be prevented from just entering a heating starting mode, the working frequency of the compressor is unstable, the discharge of refrigerant gas is influenced, and the oil blocking at the throttle device cannot be dredged, so that the oil blocking prevention effect during heating operation of the air conditioner is further ensured.
Further, the method further comprises:
responding to a defrosting instruction, and controlling the refrigerant circulation loop to convey the refrigerant according to the defrosting refrigerant flow direction;
and acquiring the coil temperature of the indoor heat exchanger, and controlling the bypass pipeline to be opened when the coil temperature is detected to be smaller than or equal to the preset pour point temperature of lubricating oil, until the coil temperature is detected to be larger than or equal to the sum of the pour point temperature and the preset temperature, and controlling the bypass pipeline to be closed.
According to the oil blocking prevention control method for the air conditioner, when the controller receives a defrosting instruction and detects that the temperature of the coil pipe of the indoor heat exchanger is smaller than or equal to the preset pour point temperature of lubricating oil, the bypass pipeline is controlled to be opened, so that refrigerant can flow back to the compressor through the bypass pipeline, the coil pipe temperature of the indoor heat exchanger is prevented from being continuously reduced to cause oil blocking, meanwhile, normal operation of refrigerant circulation during defrosting can be ensured, and when the temperature of the coil pipe of the indoor heat exchanger is detected to be larger than or equal to the sum of the pour point temperature and the preset temperature, namely, when the temperature of the indoor heat exchanger is detected to be raised to some extent, the bypass pipeline is controlled to be closed, the bypass pipeline is prevented from being opened for a long time to cause the suction of the compressor, and meanwhile, the stored heat of the indoor heat exchanger body can be recovered again to defrost.
The specific description of the oil blocking prevention control method of the air conditioner provided in this embodiment may refer to the specific description of each embodiment of the air conditioner, which is not repeated herein.
It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (8)
1. An air conditioner, comprising:
the refrigerant circulation loop consists of a compressor, a four-way valve, an outdoor heat exchanger, a throttling device and an indoor heat exchanger;
the first end of the bypass pipeline which can be opened and closed is connected to a connecting pipeline between the four-way valve and the indoor heat exchanger, and the second end of the bypass pipeline is connected to a connecting pipeline between the indoor heat exchanger and the throttling device;
a controller for:
responding to a heating instruction, and controlling the refrigerant circulation loop to convey a refrigerant according to the heating refrigerant flow direction;
and periodically controlling the bypass pipeline to be opened for a preset time period until the opening times of the bypass pipeline reach the preset times.
2. The air conditioner as set forth in claim 1, wherein said periodically controlling said bypass line to be opened for a predetermined period of time until said bypass line is opened for a predetermined number of times, specifically:
and when the working frequency of the compressor is detected to reach the preset frequency, periodically controlling the bypass pipeline to be opened for a preset time period until the opening times of the bypass pipeline reach the preset times.
3. The air conditioner of claim 1, further comprising: an indoor coil pipe temperature acquisition device; wherein,,
the indoor coil temperature acquisition device is used for detecting the coil temperature of the indoor heat exchanger;
the controller is further configured to:
responding to a defrosting instruction, and controlling the refrigerant circulation loop to convey the refrigerant according to the defrosting refrigerant flow direction;
and acquiring the coil temperature, and controlling the bypass pipeline to be opened when the coil temperature is detected to be smaller than or equal to the preset pour point temperature of lubricating oil, until the coil temperature is detected to be larger than or equal to the sum of the pour point temperature and the preset temperature, and controlling the bypass pipeline to be closed.
4. The air conditioner according to any one of claims 1 to 3, further comprising a power component;
the bypass line specifically includes:
the first end of the switch valve is a first end of the bypass pipeline and is used for being opened or closed under the control of the controller;
the radiator is arranged below the power component, the first end of the radiator is connected with the second end of the switch valve, the second end of the radiator is the second end of the bypass pipeline, and the radiator is used for exchanging heat with the power component through the coolant flowing in the bypass pipeline.
5. The air conditioner as set forth in claim 4, wherein said heat sink comprises in particular:
the base comprises a heat absorbing surface and a heat radiating surface, wherein the heat absorbing surface is used for being connected with the power component;
the refrigerant coil pipe is arranged in the base, the first end of the refrigerant coil pipe is the first end of the radiator, and the second end of the refrigerant coil pipe is the second end of the radiator;
and the fins are arranged on the radiating surface and are used for increasing the radiating area.
6. An oil blocking prevention control method of an air conditioner, characterized by being applied to the air conditioner as claimed in any one of claims 1 to 5 and executed by a controller; the method comprises the following steps:
responding to a heating instruction, and controlling the refrigerant circulation loop to convey a refrigerant according to the heating refrigerant flow direction;
and periodically controlling the bypass pipeline to be opened for a preset time period until the opening times of the bypass pipeline reach the preset times.
7. The oil blocking prevention control method of an air conditioner according to claim 6, wherein the periodically controlling the bypass line to be opened for a preset period of time until the number of times of opening the bypass line reaches a preset number of times is specifically as follows:
and when the working frequency of the compressor is detected to reach the preset frequency, periodically controlling the bypass pipeline to be opened for a preset time period until the opening times of the bypass pipeline reach the preset times.
8. The oil blocking prevention control method of an air conditioner as set forth in claim 6, further comprising:
responding to a defrosting instruction, and controlling the refrigerant circulation loop to convey the refrigerant according to the defrosting refrigerant flow direction;
and acquiring the coil temperature of the indoor heat exchanger, and controlling the bypass pipeline to be opened when the coil temperature is detected to be smaller than or equal to the preset pour point temperature of lubricating oil, until the coil temperature is detected to be larger than or equal to the sum of the pour point temperature and the preset temperature, and controlling the bypass pipeline to be closed.
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