CN110567183B - Air conditioner and defrosting control method thereof - Google Patents
Air conditioner and defrosting control method thereof Download PDFInfo
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- CN110567183B CN110567183B CN201910872055.4A CN201910872055A CN110567183B CN 110567183 B CN110567183 B CN 110567183B CN 201910872055 A CN201910872055 A CN 201910872055A CN 110567183 B CN110567183 B CN 110567183B
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located 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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/009—Indoor units, e.g. fan coil units characterised by heating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application provides an air conditioner and a defrosting control method thereof. The air conditioner comprises a compressor (1), an indoor heat exchanger (2), an outdoor heat exchanger (3) and a throttling device (4), wherein a through pipeline (5) is arranged between the outdoor heat exchanger (3) and the compressor (1), an adjusting pipeline (6) is arranged on the through pipeline (5) in parallel, the adjusting pipeline (6) comprises a liquid storage device (7), and the outdoor heat exchanger (3) is selectively communicated with the adjusting pipeline (6) or the through pipeline (5). According to the air conditioner and the defrosting control method thereof, the whole refrigerant flow direction of the air conditioner does not need to be switched when defrosting is carried out, and the air conditioner is simple in structure, low in cost and high in comfort.
Description
Technical Field
The application relates to the technical field of air conditioning, in particular to an air conditioner and a defrosting control method thereof.
Background
When the existing air conditioner is heated and operated to defrost, the air conditioner can be switched to a cooling operation mode, heat is absorbed from the indoor space, the indoor temperature drop is large during defrosting, and the comfort experience is poor.
For example, in the chinese patent application with publication number CN104422216A, an air conditioner is disclosed, in which a heat accumulator connected to a compressor is arranged on the compressor, during defrosting, a refrigerant flows out from the compressor and flows through the four-way valve to be shunted, a part of the refrigerant enters an outdoor heat exchanger through a shunt branch for defrosting, a part of the refrigerant enters an indoor heat exchanger for heat supply, two parts of the refrigerant after heat exchange are throttled and then flow into a confluence main line, and then enter the heat accumulator for heat extraction, and then return to the compressor to complete circulation. The limitation of the method is that a plurality of branches and control valves are required, the cost is high, and the process is complex.
Disclosure of Invention
Therefore, an object of the present invention is to provide an air conditioner and a defrosting control method thereof, which do not need to switch the overall refrigerant flow direction of the air conditioner during defrosting, and have the advantages of simple structure, low cost and high comfort.
In order to solve the problems, the application provides an air conditioner which comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger and a throttling device, wherein a straight-through pipeline is arranged between the outdoor heat exchanger and the compressor, an adjusting pipeline is arranged on the straight-through pipeline in parallel, the adjusting pipeline comprises a liquid storage device, and the outdoor heat exchanger is selectively communicated with the adjusting pipeline or the straight-through pipeline.
Preferably, the air conditioner further comprises a bypass pipeline, the bypass pipeline is connected with the indoor heat exchanger in parallel, one end of the bypass pipeline is communicated with the outdoor heat exchanger, the other end of the bypass pipeline is communicated with the compressor, and a control valve for controlling the on-off of the bypass pipeline is arranged on the bypass pipeline.
Preferably, the regulating pipeline further comprises a throttling unit, and the throttling unit is arranged on a pipeline between the liquid storage device and the outdoor heat exchanger.
Preferably, the throttling unit is a capillary tube.
Preferably, the outdoor heat exchanger is selectively communicated with the adjusting pipeline or the straight pipeline through a three-way valve; or the regulating pipeline and the straight-through pipeline are respectively provided with a control valve for controlling the on-off of the pipeline.
Preferably, the air conditioner further comprises a heater, wherein the heater is used for heating the outlet air of the indoor heat exchanger; and/or the air conditioner also comprises a four-way valve, and the compressor, the indoor heat exchanger and the outdoor heat exchanger are connected with the four-way valve.
Preferably, the air conditioner further comprises a gas-liquid separator disposed at a suction port of the compressor.
According to another aspect of the present application, there is provided a defrosting control method of the air conditioner, including:
acquiring an outdoor environment temperature T outer ring and a tube temperature T outer tube of an outdoor heat exchanger;
acquiring the temperature range of the T outer ring and the T outer tube;
selecting a defrosting mode according to the temperature interval range of the T outer ring and the T outer pipe;
wherein the defrosting mode comprises a first defrosting mode and a second defrosting mode;
when the air conditioner is in a first defrosting mode, the straight pipeline and the bypass pipeline are closed, and the adjusting pipeline is opened;
when the air conditioner is in the second defrosting mode, the straight pipeline is closed, and the bypass pipeline and the adjusting pipeline are opened.
Preferably, the step of selecting the defrosting mode according to the temperature interval range in which the Touter ring and the Touter pipe are located comprises the following steps:
when the T outer ring is more than or equal to a, and the T outer tube is more than T2 and less than or equal to T1 and lasts for T0 time, or when the T outer tube is more than T3 and less than or equal to T2, entering a first defrosting mode;
and when the T outer ring is more than or equal to a and the T outer tube is less than or equal to T3, or when the T outer ring is less than a, entering a second defrosting mode.
Preferably, when the air conditioner enters the first defrosting mode, the defrosting control method includes:
controlling the throttle device to be opened to a first preset step number;
controlling the three-way valve to switch so that the outdoor heat exchanger is communicated with the adjusting pipeline and is not communicated with the straight pipeline;
a control valve for controlling the bypass pipeline closes the bypass pipeline;
turning on a heater;
and adjusting the rotating speed of the indoor fan according to the pipe temperature of the indoor heat exchanger.
Preferably, when the air conditioner enters the second defrosting mode, the defrosting control method includes:
controlling the throttle device to be opened to a second preset step number;
controlling the three-way valve to switch so that the outdoor heat exchanger is communicated with the adjusting pipeline and is not communicated with the straight pipeline;
a control valve for controlling the bypass pipeline opens the bypass pipeline;
controlling the outdoor fan to stop;
and controlling the indoor fan to stop.
Preferably, the defrost control method further comprises:
detecting whether the air conditioner reaches a defrosting exit condition;
when the air conditioner reaches a defrosting exit condition, the adjusting pipeline and the bypass pipeline are controlled to be closed, and the straight pipeline is opened;
controlling the throttling device to recover the normal heating opening;
and controlling the indoor fan to recover to the set rotating speed.
The application provides an air conditioner, including compressor, indoor heat exchanger, outdoor heat exchanger and throttling arrangement, be provided with the through pipeline between outdoor heat exchanger and the compressor, parallelly connected being provided with the regulation pipeline on the through pipeline, the regulation pipeline includes the stock solution device, outdoor heat exchanger optionally with regulation pipeline or through pipeline intercommunication. This air conditioner is through setting up the stock solution device parallelly connected with the through pipeline, can change the in-process of frost at outdoor heat exchanger, the heat that cold medium accumulated in advance in the utilization stock solution device and ambient environment heat provide the heat for outdoor heat exchanger's the frost of changing, thereby can defrost under the condition that does not switch to the whole refrigerant flow direction of air conditioner, can effectively reduce the indoor cooling during the defrosting, improve the effect of heating, user experience's travelling comfort is improved, the frost of this air conditioner simple structure, and the cost is lower, change to the system is less, the transformation is with low costs, easily realize.
Drawings
Fig. 1 is a system schematic diagram of an air conditioner according to an embodiment of the present application;
fig. 2 is a refrigerant flow circulation diagram of the air conditioner according to the embodiment of the present invention under a refrigeration condition;
fig. 3 is a refrigerant flow circulation diagram of the air conditioner according to the embodiment of the present invention under a heating condition;
fig. 4 is a refrigerant flow circulation diagram of the air conditioner in the first defrosting mode according to the embodiment of the present disclosure;
fig. 5 is a refrigerant flow circulation diagram when the air conditioner of the embodiment of the present application is in the second defrosting mode;
FIG. 6 is a schematic diagram illustrating a defrosting control method of an air conditioner according to an embodiment of the present disclosure;
fig. 7 is a flowchart of a defrosting control method of an air conditioner according to an embodiment of the present application.
The reference numerals are represented as:
1. a compressor; 2. an indoor heat exchanger; 3. an outdoor heat exchanger; 4. a throttling device; 5. a straight-through pipeline; 6. adjusting the pipeline; 7. a liquid storage device; 8. a bypass line; 9. a control valve; 10. a throttling unit; 11. a three-way valve; 12. a heater; 13. a four-way valve; 14. a gas-liquid separator.
Detailed Description
Referring to fig. 1 to 5 in combination, according to an embodiment of the present application, the air conditioner includes a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, and a throttling device 4, a through pipe 5 is disposed between the outdoor heat exchanger 3 and the compressor 1, an adjusting pipe 6 is disposed on the through pipe 5 in parallel, the adjusting pipe 6 includes a liquid storage device 7, and the outdoor heat exchanger 3 is selectively communicated with the adjusting pipe 6 or the through pipe 5.
This air conditioner is through setting up the regulation pipeline 6 parallelly connected with through pipeline 5, and set up stock solution device 7 on adjusting pipeline 6, can change the in-process of frost at outdoor heat exchanger 3, the heat that utilizes the heat of cold medium accumulation in advance in stock solution device 7 and the heat that produces of compressor 1 doing work for outdoor heat exchanger 3's the frost provides the heat, thereby can defrost under the condition that does not switch over the whole refrigerant flow direction of air conditioner, realize continuously supplying heat during the defrosting, can effectively reduce the indoor cooling during the defrosting, improve the effect of heating, improve user experience's travelling comfort, this air conditioner change the frost simple structure, and the cost is lower, change to the system is less, it is with low costs to reform transform, easily realize. The overall refrigerant flow direction of the air conditioner refers to the flow direction of the air conditioner after flowing out of the compressor, and mainly refers to the refrigerant flow direction when the air conditioner is not changed in the heating condition.
In the embodiment, in the defrosting process of the outdoor heat exchanger 3, the refrigerant still flows through the indoor heat exchanger 2 and then flows to the outdoor heat exchanger 3, so that a part of heat can still be provided for the indoor heat exchanger 2, although the provided heat is less than that provided in the normal heating process of the air conditioner, the indoor temperature can still be effectively kept in a more proper temperature range, and the adverse effect of defrosting of the outdoor heat exchanger 3 on the indoor temperature is reduced as much as possible. The heat for defrosting the outdoor heat exchanger 3 mainly comes from the heat accumulated in advance by the refrigerant in the liquid storage device 7, the heat of the surrounding environment and the heat generated by the work done by the compressor, so that the heating of the indoor heat exchanger 2 and the defrosting of the outdoor heat exchanger 3 can be still maintained to a certain extent, and the aim of defrosting the outdoor heat exchanger 3 without changing the whole refrigerant flow direction of the air conditioner is fulfilled.
The defrosting mode is a first defrosting mode of the present application.
The air conditioner can further comprise a bypass pipeline 8, the bypass pipeline 8 is connected with the indoor heat exchanger 2 in parallel, one end of the bypass pipeline 8 is communicated with the outdoor heat exchanger 3, the other end of the bypass pipeline 8 is communicated with the compressor 1, and a control valve 9 for controlling the bypass pipeline 8 to be switched on and off is arranged on the bypass pipeline 8.
Through increasing bypass line 8, can directly carry out the short circuit to indoor heat exchanger 2 at the air conditioner operation in-process for compressor 1 exhaust high temperature refrigerant can directly enter into outdoor heat exchanger 3 and defrost, because the high temperature refrigerant does not basically flow through indoor heat exchanger 2, therefore the heat of high temperature refrigerant can mainly used heat the defrosting to outdoor heat exchanger 3, can improve the defrosting efficiency to outdoor heat exchanger 3, guarantees to provide sufficient heat for the defrosting of outdoor heat exchanger 3. Meanwhile, although the high-temperature refrigerant does not flow through the indoor heat exchanger 2, the refrigerant entering the indoor heat exchanger 2 can still continuously radiate heat outwards when the air conditioner is in a normal heating state, so that the temperature of the indoor heat exchanger 2 can be effectively prevented from being rapidly reduced to influence the indoor temperature, the indoor temperature can be kept at a more appropriate temperature for a longer time, and the use experience of a user can not be reduced.
In the embodiment, a bypass pipeline 8 connected with the indoor heat exchanger 2 in parallel is added, so that a second defrosting mode is provided for the air conditioner. In the first defrosting mode, which is more suitable for a situation where the outdoor temperature is relatively high, the air conditioner can absorb enough heat from the outdoor environment to defrost when defrosting the outdoor heat exchanger 3. For the second defrosting mode, the air conditioner is more suitable for the situation that the outdoor temperature is relatively low, and in such a situation, the air conditioner is difficult to directly absorb enough heat from the outdoor environment to defrost the outdoor heat exchanger 3, so that the defrosting of the outdoor heat exchanger 3 is mainly realized by utilizing the heat of the refrigerant of the air conditioner. The two defrosting modes can be used for defrosting the outdoor heat exchanger 3 under the condition that the flowing direction of the whole refrigerant of the air conditioner is not switched, and the appropriate defrosting mode can be selected according to the actual working condition, so that the air conditioner has better working energy efficiency, and the indoor temperature can be influenced less.
The regulating pipeline 6 further comprises a throttling unit 10, and the throttling unit 10 is arranged on a pipeline between the liquid storage device 7 and the outdoor heat exchanger 3. The refrigerant flows to liquid storage device 7's in-process from outdoor heat exchanger 3, can at first carry out the throttle through throttle unit 10 to in-process that mixes with the refrigerant in liquid storage device 7, absorb more heat from liquid storage device 7's refrigerant, make the refrigerant heat in liquid storage device 7 can enter into the compressor more, improve the exhaust temperature of compressor, shorten the defrosting time simultaneously, can also utilize liquid storage device 7 to avoid taking place the liquid hammer phenomenon more effectively.
Preferably, the throttling unit 10 is a capillary tube. Other throttling elements such as electronic expansion valves may also be used in the throttling unit 10.
The structure for realizing the selective communication between the outdoor heat exchanger 3 and the adjusting pipeline 6 or the through pipeline 5 can be various, for example, the outdoor heat exchanger 3 is selectively communicated with the adjusting pipeline 6 or the through pipeline 5 through a three-way valve 11; or the regulating pipeline 6 and the straight-through pipeline 5 are respectively provided with a control valve 9 for controlling the on-off of the pipelines. In any case, as long as the refrigerant flow path can be controlled conveniently, the communication state between the outdoor heat exchanger 3 and the adjusting line 6 or the straight line 5 can be switched conveniently.
Preferably, the air conditioner further comprises a heater 12, wherein the heater 12 is used for heating the outlet air of the indoor heat exchanger 2; and/or the air conditioner also comprises a four-way valve 13, and the compressor 1, the indoor heat exchanger 2 and the outdoor heat exchanger 3 are connected with the four-way valve 13. When the air conditioner comprises the four-way valve 13, the defrosting control method can realize defrosting of the outdoor heat exchanger 3 without switching the four-way valve 13, reduce indoor temperature drop during defrosting under the condition of small system configuration change, improve comfort and reduce cost.
When the first defrosting mode is adopted for defrosting, the indoor heat exchanger 2 is still in a heating state, and therefore the indoor fan is required to be kept on, however, the heat source is less, the refrigerant absorbs heat and is difficult to ensure that the heating quantity of the indoor heat exchanger 2 meets the indoor heating requirement, and therefore under the state that the indoor fan is on, the air with relatively low temperature after the heat exchange of the indoor heat exchanger 2 can be rapidly diffused to the peripheral side, so that the indoor temperature is obviously reduced, therefore, in order to improve the condition, the indoor environment temperature is improved by increasing the auxiliary heat source, and the defrosting mode is an effective mode. This application is through increasing heater 12, can heat the air that indoor heat exchanger 2 blew out to effectively improve indoor ambient temperature, make indoor ambient temperature keep at suitable temperature, improve user's use experience more effectively.
The air conditioner further includes a gas-liquid separator 14, and the gas-liquid separator 14 is disposed at a suction port of the compressor 1.
The above-mentioned throttle device 4 is, for example, an electronic expansion valve. The liquid storage device 7 is, for example, a liquid storage tank.
Referring to fig. 6 and 7 in combination, according to an embodiment of the present application, a defrosting control method of an air conditioner includes: acquiring an outdoor environment temperature T outer ring and a tube temperature T outer tube of the outdoor heat exchanger 3; acquiring the temperature range of the T outer ring and the T outer tube; selecting a defrosting mode according to the temperature interval range of the T outer ring and the T outer pipe; wherein the defrosting mode comprises a first defrosting mode and a second defrosting mode; when the air conditioner is in a first defrosting mode, the straight pipeline 5 and the bypass pipeline 8 are closed, and the adjusting pipeline 6 is opened; when the air conditioner is in the second defrosting mode, the straight pipeline 5 is closed, and the bypass pipeline 8 and the adjusting pipeline 6 are opened.
Through the control method, the T outer ring and the T outer pipe can be used as a judgment basis for selecting the defrosting mode of the air conditioner, the T outer ring has a large influence on the air conditioner to absorb enough heat from the ambient environment to defrost the outdoor heat exchanger 3, the T outer pipe has enough influence on whether the refrigerant can provide enough heat for defrosting of the outdoor heat exchanger 3, and the T outer ring and the refrigerant can influence the defrosting effect and the defrosting efficiency of the outdoor heat exchanger 3 at the same time, so that accurate basis can be provided for selecting the defrosting mode of the air conditioner by obtaining the numerical values of the T outer ring and the T outer pipe, the defrosting efficiency and the defrosting effect of the outdoor heat exchanger 3 of the air conditioner are ensured, and the operation energy efficiency of the air conditioner is improved.
The step of selecting the defrosting mode according to the temperature interval range of the T outer ring and the T outer pipe comprises the following steps: when the T outer ring is more than or equal to a, and the T outer tube is more than T2 and less than or equal to T1 and lasts for T0 time, or when the T outer tube is more than T3 and less than or equal to T2, entering a first defrosting mode; and when the T outer ring is more than or equal to a and the T outer tube is less than or equal to T3, or when the T outer ring is less than a, entering a second defrosting mode.
The above-mentioned a is, for example, 1 deg.C, T1 is, for example, -5 deg.C, T2 is, for example, -10 deg.C to-5 deg.C, T3 is related to the outdoor ambient temperature, and is generally lower than the outdoor ambient temperature, for example, -10 deg.C. t0 is for example 2-3 min.
The three temperatures of T1, T2, T3 are the restriction to the frost accumulation degree, can guarantee to select suitable defrosting mode, can effectively prevent to adopt first defrosting mode to change the problem of unclean frost when outdoor heat exchanger 3 frosts too thickly for the air conditioner can select more suitable defrosting mode, improves the validity of outdoor heat exchanger 3 defrosting.
For example, the Touter pipe is lower than the defrosting temperature T1 and maintains a specified T0min between T1 and T2, then the first defrosting mode is entered; if the temperature of the outdoor heat exchanger 3 drops more slowly and directly drops between T2 and T3, the first defrosting mode is directly entered without continuing; and if the tube temperature of the outdoor heat exchanger 3 is less than T3, judging that the frosting degree is severe, and selecting to enter a second defrosting mode for defrosting.
When the air conditioner enters a first defrosting mode, the defrosting control method comprises the following steps: controlling the throttle device 4 to be opened to a first preset step number; controlling the three-way valve 11 to switch so that the outdoor heat exchanger 3 is communicated with the adjusting pipeline 6 and is not communicated with the straight pipeline 5; the control valve 9 controlling the bypass line 8 closes the bypass line 8; turning on the heater 12; and adjusting the rotating speed of the indoor fan according to the pipe temperature of the indoor heat exchanger 2. The above-mentioned throttle device 4 is, for example, an electronic expansion valve.
In this embodiment, after the air conditioner enters the first defrosting mode, the opening degree of the electronic expansion valve needs to be increased to a certain step number, preferably to the maximum opening degree, because when the air conditioner is in the first defrosting mode, both the indoor heat exchanger 2 and the outdoor heat exchanger 3 are in the heat release state, it is necessary to avoid throttling of the refrigerant before the refrigerant comes out of the indoor heat exchanger 2 to the outdoor heat exchanger 3, and to avoid heat absorption of the refrigerant after the refrigerant enters the outdoor heat exchanger 3, and therefore, the electronic expansion valve needs to be reduced or avoided as much as possible to play a throttling role, and it is ensured that the refrigerant still is in the heat release state after the refrigerant enters the outdoor heat exchanger 3.
Because the throttling unit 10 is arranged between the outdoor heat exchanger 3 and the liquid storage device 7, the refrigerant can absorb heat after entering the liquid storage device 7, under the condition, the indoor heat exchanger 2 and the outdoor heat exchanger 3 are taken as condensers, the throttling unit 10 is taken as a throttling device of the air conditioner, and the liquid storage device 7 is taken as an evaporator of the air conditioner, so that the refrigerant circularly flows, and the heat exchange circulation of the air conditioner can be ensured to be smoothly carried out.
When the air conditioner enters a second defrosting mode, the defrosting control method comprises the following steps: controlling the throttle device 4 to be opened to a second preset step number; controlling the three-way valve 11 to switch so that the outdoor heat exchanger 3 is communicated with the adjusting pipeline 6 and is not communicated with the straight pipeline 5; a control valve 9 for controlling the bypass pipeline 8 opens the bypass pipeline 8; controlling the outdoor fan to stop; and controlling the indoor fan to stop.
The defrosting control method further includes: detecting whether the air conditioner reaches a defrosting exit condition; when the air conditioner reaches a defrosting exit condition, the regulating pipeline 6 and the bypass pipeline 8 are controlled to be closed, and the straight pipeline 5 is opened; controlling the throttling device 4 to recover the normal heating opening; and controlling the indoor fan to recover to the set rotating speed.
When the air conditioner enters a first defrosting mode, the indoor fan adjusts the rotating speed according to the pipe temperature of the indoor heat exchanger 2, the outdoor heat exchanger 3 utilizes an environment heat source and a high-temperature refrigerant supercooled from the indoor heat exchanger 2 to defrost, and the defrosting process continuously supplies heat. When the air conditioner reaches a defrosting exit condition, the regulating pipeline 6 and the bypass pipeline 8 are controlled to be closed, and the straight pipeline 5 is opened; controlling the throttling device 4 to recover the normal heating opening; and controlling the indoor fan to recover to the set rotating speed, and simultaneously closing the heater 12 after the pipe temperature of the indoor heat exchanger 2 meets the requirement, thereby realizing the normal heating control of the air conditioner.
When the air conditioner enters a second defrosting mode, the control valve 9 on the bypass pipeline 8 is opened, the three-way valve is switched to the adjusting pipeline 6 where the liquid storage device 7 is located, the electronic expansion valve is adjusted to a preset opening degree, the outdoor fan and the indoor fan stop simultaneously, high-temperature refrigerants directly enter the outdoor heat exchanger 3 from the bypass pipeline 8 to be defrosted, the liquid storage device 7 is throttled and flashed to form a small evaporator, defrosting efficiency is improved, and liquid refrigerants are prevented from entering the compressor to generate liquid impact. The outdoor fan and the indoor fan stop, and the indoor heat exchanger 2 does not heat at the moment, so that the indoor fan stops, air with lower temperature generated by the indoor heat exchanger 2 can stay on the peripheral side of the indoor heat exchanger 2, the air cannot be rapidly expanded to other indoor positions, the indoor temperature is rapidly reduced, the indoor temperature can be kept in a higher state for a long time, the adverse effect on the indoor temperature in a defrosting stage is effectively reduced, and the indoor temperature is maintained to be suitable. And the outdoor fan stops, then can guarantee that the heat that the refrigerant distributes through outdoor heat exchanger 3 can keep around outdoor heat exchanger 3 for form the air of higher temperature around outdoor heat exchanger 3, thereby accelerate the defrosting efficiency of outdoor heat exchanger 3, improve the defrosting effect of outdoor heat exchanger 3.
After the air conditioner enters the second defrosting mode, the indoor fan can be turned on, and the heater 12 is turned on simultaneously, so that the indoor temperature is heated in an auxiliary manner by the heater 12, the indoor environment temperature is guaranteed to be in a relatively constant temperature range, and the use comfort of a user is improved.
When the air conditioner reaches a defrosting exit condition, the regulating pipeline 6 and the bypass pipeline 8 are controlled to be closed, and the straight pipeline 5 is opened; controlling the throttling device 4 to recover the normal heating opening; and controlling the indoor fan and the outdoor fan to recover to the set rotating speed, so as to realize the normal heating control of the air conditioner. In this embodiment, when the air conditioner is in the second defrosting mode, since the indoor heat exchanger 2 is short-circuited, the opening degree of the electronic expansion valve may be unchanged or may be adjusted to be as small as possible, so as to reduce the possibility that the refrigerant flows through the indoor heat exchanger 2 as possible.
In the heating operation or the refrigerating operation process of the air conditioner, the bypass pipeline 8 and the adjusting pipeline 6 are both in a closed state, and the liquid storage device 7 only increases the volume of the system and can reduce the pressure of the system.
Preferably, before the air conditioner enters the defrosting mode, whether the accumulated running time of the air conditioner reaches the time required to detect defrosting or not needs to be detected, when the accumulated running time does not reach the time, the air conditioner does not need to enter the defrosting mode, and when the accumulated running time reaches the time, the air conditioner needs to be subjected to defrosting control according to the detected T outer ring and the detected T outer tube.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (11)
1. An air conditioner is characterized by comprising a compressor (1), an indoor heat exchanger (2), an outdoor heat exchanger (3) and a throttling device (4), wherein a through pipeline (5) is arranged between the outdoor heat exchanger (3) and the compressor (1), an adjusting pipeline (6) is arranged on the through pipeline (5) in parallel, the adjusting pipeline (6) comprises a liquid storage device (7), and the outdoor heat exchanger (3) is selectively communicated with the adjusting pipeline (6) or the through pipeline (5); the air conditioner further comprises a bypass pipeline (8), the bypass pipeline (8) is connected with the indoor heat exchanger (2) in parallel, one end of the bypass pipeline (8) is communicated with the outdoor heat exchanger (3), the other end of the bypass pipeline (8) is communicated with the compressor (1), and a control valve (9) for controlling the on-off of the bypass pipeline (8) is arranged on the bypass pipeline (8);
and the air conditioner selects the on-off of the bypass pipeline (8) according to the temperature range of the T outer ring and the T outer pipe.
2. Air conditioner according to claim 1, characterized in that the conditioning circuit (6) further comprises a throttling unit (10), the throttling unit (10) being arranged on the circuit between the liquid storage means (7) and the outdoor heat exchanger (3).
3. Air conditioner according to claim 2, characterized in that the throttling unit (10) is a capillary tube.
4. Air conditioner according to claim 1, characterized in that the outdoor heat exchanger (3) is in selective communication with the conditioning line (6) or the through line (5) through a three-way valve (11); or the adjusting pipeline (6) and the straight-through pipeline (5) are respectively provided with a control valve (9) for controlling the on-off of the pipelines.
5. The air conditioner according to claim 1, further comprising a heater (12), wherein the heater (12) is used for heating the outlet air of the indoor heat exchanger (2); and/or the air conditioner also comprises a four-way valve (13), and the compressor (1), the indoor heat exchanger (2) and the outdoor heat exchanger (3) are connected with the four-way valve (13).
6. The air conditioner according to claim 1, further comprising a gas-liquid separator (14), the gas-liquid separator (14) being provided at a suction port of the compressor (1).
7. A defrost control method of an air conditioner according to any one of claims 1 to 6, comprising:
acquiring an outdoor environment temperature T outer ring and a tube temperature T outer tube of an outdoor heat exchanger (3);
acquiring the temperature range of the T outer ring and the T outer tube;
selecting a defrosting mode according to the temperature interval range of the T outer ring and the T outer pipe;
wherein the defrosting mode comprises a first defrosting mode and a second defrosting mode;
when the air conditioner is in a first defrosting mode, the straight pipeline (5) and the bypass pipeline (8) are closed, and the adjusting pipeline (6) is opened;
when the air conditioner is in the second defrosting mode, the straight-through pipeline (5) is closed, and the bypass pipeline (8) and the adjusting pipeline (6) are opened.
8. The defrost control method of claim 7, wherein the step of selecting the defrost mode based on the temperature range in which the T outer ring and the T outer tube are located comprises:
when the T outer ring is more than or equal to a, and the T outer tube is more than T2 and less than or equal to T1 and lasts for T0 time, or when the T outer tube is more than T3 and less than or equal to T2, entering a first defrosting mode;
and when the T outer ring is more than or equal to a and the T outer tube is less than or equal to T3, or when the T outer ring is less than a, entering a second defrosting mode.
9. The defrost control method according to claim 7 or 8, characterized in that in case the air conditioner comprises a heater (12), said heater (12) is used for heating the outlet air of the indoor heat exchanger (2), when the air conditioner enters the first defrost mode, the defrost control method comprises:
controlling the opening of the throttling device (4) to be larger than a first preset step number;
the three-way valve (11) is controlled to switch, so that the outdoor heat exchanger (3) is communicated with the adjusting pipeline (6) and is not communicated with the straight pipeline (5);
a control valve (9) for controlling the bypass pipeline (8) closes the bypass pipeline (8);
turning on the heater (12);
and adjusting the rotating speed of the indoor fan according to the pipe temperature of the indoor heat exchanger (2).
10. The defrost control method of claim 7 or 8, wherein when the air conditioner enters the second defrost mode, the defrost control method comprises:
controlling the opening of the throttling device (4) to a second preset step number;
the three-way valve (11) is controlled to switch, so that the outdoor heat exchanger (3) is communicated with the adjusting pipeline (6) and is not communicated with the straight pipeline (5);
a control valve (9) for controlling the bypass pipeline (8) opens the bypass pipeline (8);
controlling the outdoor fan to stop;
and controlling the indoor fan to stop.
11. The defrost control method of claim 7, further comprising:
detecting whether the air conditioner reaches a defrosting exit condition;
when the air conditioner reaches a defrosting exit condition, the adjusting pipeline (6) and the bypass pipeline (8) are controlled to be closed, and the straight pipeline (5) is opened;
controlling the throttling device (4) to recover the normal heating opening;
and controlling the indoor fan to recover to the set rotating speed.
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| CN111503819B (en) * | 2020-04-29 | 2022-05-03 | 广东美的制冷设备有限公司 | Control method of air conditioning system and air conditioning system |
| CN111637594A (en) * | 2020-06-11 | 2020-09-08 | 宁波奥克斯电气股份有限公司 | Defrosting control method and device and air conditioner |
| CN112665226B (en) * | 2020-12-15 | 2024-04-12 | 珠海格力电器股份有限公司 | Air conditioning system and control method thereof |
| CN113188265B (en) * | 2021-04-14 | 2022-08-02 | 三一汽车起重机械有限公司 | Air conditioner cold air prevention control system and method and air conditioner |
| CN113587262B (en) * | 2021-07-26 | 2022-07-08 | 珠海格力电器股份有限公司 | Outdoor unit, air conditioning system and control method thereof |
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| JPH08159621A (en) * | 1994-12-08 | 1996-06-21 | Hitachi Ltd | Air conditioner |
| CN101749904A (en) * | 2008-12-05 | 2010-06-23 | 乐金电子(天津)电器有限公司 | Hot air bypassing continuous heat-supply and defrost cycle structure of air conditioner |
| CN103383157B (en) * | 2013-06-28 | 2016-01-13 | 美的集团股份有限公司 | Heat pump type air conditioning system and control method thereof |
| CN109959120B (en) * | 2019-03-21 | 2021-03-19 | 宁波奥克斯电气股份有限公司 | Defrosting method of air conditioner and air conditioner |
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