CN114909776B - Air conditioner and defrosting control method thereof - Google Patents
Air conditioner and defrosting control method thereof Download PDFInfo
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- CN114909776B CN114909776B CN202210605555.3A CN202210605555A CN114909776B CN 114909776 B CN114909776 B CN 114909776B CN 202210605555 A CN202210605555 A CN 202210605555A CN 114909776 B CN114909776 B CN 114909776B
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- 238000010257 thawing Methods 0.000 title claims abstract description 212
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 14
- 239000003507 refrigerant Substances 0.000 claims description 42
- 230000000694 effects Effects 0.000 description 11
- 238000001816 cooling Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- 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
- 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
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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
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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)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner and a defrosting control method of the air conditioner, wherein the air conditioner comprises the following components: an indoor unit including an indoor heat exchanger; the outdoor unit comprises a compressor, an outdoor heat exchanger, an outdoor fan and an outdoor back net; the controller is configured to record the operation time length of the compressor in each operation period in the operation heating mode process of the air conditioner, and record the current operation time length of the compressor when the defrosting temperature condition is met for the first time; determining that the running time lengths of the compressors in the continuous N running periods all meet the post-net frosting condition, wherein N is a positive integer greater than 1; and controlling the air conditioner to enter a first defrosting mode, wherein the first defrosting mode comprises a basic defrosting stage and a back net defrosting stage. The air conditioner can solve the problem of outdoor back net frost, and improves the heat exchange rate of the air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and a defrosting control method of the air conditioner.
Background
The heat dissipation fins of the condenser (evaporator) of the outdoor unit of the air conditioner are exposed outside generally, are sharp and are easy to collide and deform in the processes of production, transportation, installation and the like, so that the heat exchange effect is affected, therefore, an outdoor back net is adopted at the exposed part to protect the heat dissipation fins of the condenser (evaporator) of the outdoor unit from being damaged, but the cost is limited, the outdoor back net is generally made of plastic materials and is in a dense-pore structure, and is easy to slightly deform in the installation process, so that gaps of 0.5-2 cm are generated between the outdoor back net and the heat dissipation fins.
When the air conditioner executes defrosting mode to melt the frost of the outdoor heat exchanger completely, the outdoor back net cannot acquire heat generated by the outdoor heat exchanger due to an installation gap between the outdoor heat exchanger and the outdoor back net, so that the frost of the outdoor back net cannot be melted, and after the air conditioner runs the defrosting mode for many times, the frost formed by the outdoor back net becomes more, so that defrosting of the outdoor back net is needed.
In the related art, an air conditioner generally adopts a reverse circulation defrosting mode, namely a refrigerating mode defrosting mode, and determines that an outdoor heat exchanger needs to defrost through a fixed or small-range-variable compressor operation time, an outdoor coil temperature and an outdoor heat exchange temperature difference, and when the reverse circulation defrosting mode is executed, an outdoor fan is controlled to stop operation so as to increase heat released by the outdoor heat exchanger, so that frost of the outdoor heat exchanger is melted, and then the frost of the outdoor heat exchanger is completely eliminated according to the defrosting time and the outdoor coil temperature, and the air conditioner exits the defrosting mode and returns to a heating mode operation, wherein the outdoor heat exchange temperature difference is a difference value between an outdoor environment temperature and the outdoor coil temperature. However, in the reverse circulation defrosting mode, frost of the outdoor back net cannot be removed, so that the heat exchange rate of the outdoor heat exchanger is seriously attenuated, the heating capacity of the air conditioner is reduced, the user experience is affected, meanwhile, the frosting speed of the outdoor heat exchanger is accelerated, a vicious circle is formed, and the air conditioner is damaged.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide an air conditioner, which can solve the problem of outdoor back net frost and improve the heat exchange rate of the air conditioner.
The second objective of the present invention is to provide a defrosting control method for an air conditioner.
In order to solve the above problems, an embodiment of a first aspect of the present invention provides an air conditioner, including: an indoor unit including an indoor heat exchanger; the outdoor unit comprises a compressor, an outdoor heat exchanger, an outdoor fan and an outdoor back net; a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator and the four-way valve; the controller is configured to record the operation time length of the compressor in each operation period in the operation heating mode process of the air conditioner, and record the current operation time length of the compressor when the defrosting temperature condition is met for the first time; determining that the running time lengths of the compressors in the continuous N running periods all meet the post-net frosting condition, wherein N is a positive integer greater than 1; and controlling the air conditioner to enter a first defrosting mode, wherein the first defrosting mode comprises a basic defrosting stage and a back net defrosting stage.
According to the air conditioner provided by the embodiment of the invention, when the air conditioner is in the heating mode, the frosting condition of the outdoor back net is judged by the running time of the compressor when the defrosting temperature condition is met in the running period, when the running time of the compressor in the continuous N running periods is determined to meet the back net frosting condition, the frosting quantity of the outdoor back net can be determined to seriously influence the heating effect of the air conditioner, the air conditioner is controlled to enter the first defrosting mode, so that the outdoor heat exchanger, the radiating fins and the outdoor back net are defrosted, the frosting on the outdoor back net is effectively removed, vicious circulation is avoided, the heating effect of the air conditioner is improved, and the comfort experience of a user is improved.
In some embodiments, when controlling the air conditioner to enter the first defrost mode, the controller is further configured to: entering the basic defrosting stage, controlling the air conditioner to operate in a refrigerating mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating until the air conditioner meets a basic defrosting ending condition; entering the back net defrosting stage, and controlling the outdoor fan to reversely run; determining that the reverse operation time length of the outdoor fan reaches a preset operation time length, controlling the operation time length of the compressor to be cleared, controlling the air conditioner to exit the first defrosting mode, and entering the next operation period.
In some embodiments, the post-net frosting conditions are: the first set duration is less than or equal to the operated duration of the compressor and less than or equal to the second set duration.
In some embodiments, the defrost temperature condition is: the temperature of the outdoor coil reaches a first preset temperature lower limit value, and the temperature difference value between the temperature of the outdoor coil and the outdoor environment temperature reaches a preset temperature difference upper limit value; the basic defrosting end conditions are: the outdoor coil temperature reaches a second preset upper temperature limit.
In some embodiments, the controller is further configured to: determining that the running time lengths of the compressors in the discontinuous N running periods all meet the post-net frosting condition; after determining that the current operation time of the compressor reaches the preset operation time, controlling the air conditioner to enter a second defrosting mode, wherein in the second defrosting mode, controlling the air conditioner to operate in a refrigerating mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating; and determining that the air conditioner meets a basic defrosting ending condition, controlling the running duration of the compressor to be cleared, and controlling the air conditioner to exit the second defrosting mode.
An embodiment of a second aspect of the present invention provides a defrosting control method for an air conditioner, including: in the operation and heating mode of the air conditioner, in each operation period, the operation time of the compressor is recorded, and when the defrosting temperature condition is met for the first time, the current operation time of the compressor is recorded; determining that the running time lengths of the compressors in the continuous N running periods all meet the post-net frosting condition, wherein N is a positive integer greater than 1; and controlling the air conditioner to enter a first defrosting mode, wherein the first defrosting mode comprises a basic defrosting stage and a back net defrosting stage.
According to the defrosting control method for the air conditioner, provided by the embodiment of the invention, when the air conditioner is in a heating mode, the frosting condition of the outdoor back net is judged by the running time of the compressor when the defrosting temperature condition is met in the running period, when the running time of the compressor in the continuous N running periods is confirmed to meet the back net frosting condition, the frosting quantity of the outdoor back net can be confirmed to seriously influence the heating effect of the air conditioner, so that after the current running time of the compressor reaches the preset running time, the air conditioner is controlled to enter the first defrosting mode so as to defrost the outdoor heat exchanger, the radiating fins and the outdoor back net, the frosting on the outdoor back net is effectively removed, vicious circulation is avoided, the heating effect of the air conditioner is improved, and the comfort experience of a user is improved.
In some embodiments, controlling the air conditioner to enter a first defrost mode includes: entering the basic defrosting stage, controlling the air conditioner to operate in a refrigerating mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating until the air conditioner meets a basic defrosting ending condition; entering the back net defrosting stage, and controlling the outdoor fan to reversely run; determining that the reverse operation time length of the outdoor fan reaches a preset operation time length, controlling the operation time length of the compressor to be cleared, controlling the air conditioner to exit the first defrosting mode, and entering the next operation period.
In some embodiments, the post-net frosting conditions are: the first set duration is less than or equal to the operated duration of the compressor and less than or equal to the second set duration.
In some embodiments, the defrost temperature condition is: the temperature of the outdoor coil reaches a first preset temperature lower limit value, and the temperature difference value between the temperature of the outdoor coil and the outdoor environment temperature reaches a preset temperature difference upper limit value; the basic defrosting end conditions are: the outdoor coil temperature reaches a second preset upper temperature limit.
In some embodiments, the controller is further configured to: determining that the running time lengths of the compressors in the discontinuous N running periods all meet the post-net frosting condition; after determining that the current operation time of the compressor reaches the preset operation time, controlling the air conditioner to enter a second defrosting mode, wherein in the second defrosting mode, controlling the air conditioner to operate in a refrigerating mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating; and determining that the air conditioner meets a basic defrosting ending condition, controlling the running duration of the compressor to be cleared, and controlling the air conditioner to exit the second defrosting mode.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a perspective view of an external appearance of an air conditioner according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an outline of a structure of an air conditioner according to an embodiment of the present invention;
fig. 3 is a schematic view of a flow direction of a refrigerant in a heating mode according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the direction of refrigerant flow in a cooling mode according to one embodiment of the invention;
fig. 5 is a schematic view of an outdoor unit according to an embodiment of the present invention;
fig. 6 is a flowchart of an air conditioner defrost control method according to an embodiment of the present invention;
FIG. 7 is a flowchart of a first defrost mode control method according to one embodiment of the present invention;
fig. 8 is a flowchart of a defrosting control method of an air conditioner according to another embodiment of the present invention.
Reference numerals:
1: an air conditioner; 2: an outdoor unit; 3: an indoor unit; 4: connecting a piping;
11: a compressor; 14: an expansion valve; 15: a reservoir; 16: an indoor heat exchanger; 21: an outdoor fan; 22: an outdoor heat exchanger; 24: outdoor back net; 26: an outdoor control device; 27: an outdoor ambient temperature sensor; 28: an outdoor coil temperature sensor; 29: a four-way valve; 31: an indoor fan; 35: an indoor control device; 50: a controller;
21a: an outdoor fan motor; 31a: an indoor fan motor.
Detailed Description
Embodiments of the present application will be described in detail below, by way of example with reference to the accompanying drawings.
The air conditioner of the present application performs a refrigerating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner may adjust the temperature of the indoor space throughout the cycle.
An outdoor unit of an air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, an indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater of a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler of a cooling mode.
The air conditioner 1 shown in fig. 1 includes: the indoor unit 3 is, for example, an indoor unit (shown in the figure), and the indoor unit is usually mounted on the indoor wall surface. For another example, an indoor unit (not shown) is also an indoor unit mode. The outdoor unit 2 is usually installed outdoors and is used for heat exchange in an indoor environment.
Fig. 2 shows a circuit configuration of the air conditioner 1, and the air conditioner 1 is provided with an indoor controller 50 for controlling operations of respective components in the air conditioner 1 inside, so that the respective components of the air conditioner 1 are operated to realize respective predetermined functions of the air conditioner 1.
As shown in fig. 2, the air conditioner 1 further includes a compressor 11, an outdoor heat exchanger 22, an expansion valve 14, a receiver 15, and an indoor heat exchanger 16. The indoor heat exchanger 16 and the outdoor heat exchanger 22 operate as condensers or evaporators, i.e., one operates as a condenser and the other operates as an evaporator. The compressor 11 sucks in refrigerant from the suction port, and discharges the refrigerant compressed therein to the indoor heat exchanger 16 from the discharge port. The compressor 11 is an inverter compressor of variable capacity that performs rotational speed control based on an inverter.
The outdoor heat exchanger 22 has a first inlet and outlet for passing the refrigerant between the compressor 11 and the suction port via the accumulator 15, and has a second inlet and outlet for passing the refrigerant between the expansion valve 14. The outdoor heat exchanger 22 exchanges heat between the outdoor air and the refrigerant flowing through a heat transfer tube (not shown) connected between the second inlet and the first inlet of the outdoor heat exchanger 22.
The expansion valve 14 is disposed between the outdoor heat exchanger 22 and the indoor heat exchanger 16. The expansion valve 14 has a function of expanding and decompressing the refrigerant flowing between the outdoor heat exchanger 22 and the indoor heat exchanger 16.
The indoor heat exchanger 16 has a second inlet and outlet for allowing the liquid refrigerant to flow between the expansion valve 14 and a first inlet and outlet for allowing the gas refrigerant to flow between the gas refrigerant and the discharge port of the compressor 11.
A receiver 15 is disposed between the outdoor heat exchanger 22 and the suction port of the compressor 11. In the accumulator 15, the refrigerant flowing from the outdoor heat exchanger 22 to the compressor 11 is separated into a gas refrigerant and a liquid refrigerant. The gas refrigerant is mainly supplied from the accumulator 15 to the suction port of the compressor 11.
The outdoor unit 2 further includes an outdoor fan 21, and the outdoor fan 21 generates an airflow of the outdoor air passing through the outdoor heat exchanger 22. The outdoor fan 21 is driven by an outdoor fan motor 21a capable of changing the rotational speed. The indoor unit 3 further includes an indoor fan 31, and the indoor fan 31 generates an airflow of the indoor air passing through the indoor heat exchanger 16, and the indoor fan 31 is driven by an indoor fan motor 31a capable of changing the rotation speed.
As shown in fig. 2, the controller 50 includes an outdoor control device 26 incorporated in the outdoor unit 2 and an indoor control device 35 incorporated in the indoor unit 3. The outdoor control device 26 and the indoor control device 35 are connected to each other by a signal line, and can transmit and receive signals to and from each other. The outdoor control device 26 of the outdoor unit 2 controls the compressor 11, the expansion valve 14, the outdoor fan 21, and the like.
As shown in fig. 3, in the heating mode of the air conditioner 1, the high-temperature and high-pressure refrigerant discharged from the compressor 11 flows into the indoor heat exchanger 16 through the four-way valve 29. At this time, the indoor heat exchanger 16 functions as a condenser. Therefore, the refrigerant flows through the indoor heat exchanger 16, heats the indoor air by heat exchange with the indoor air, and radiates heat to cool the refrigerant. The low-temperature high-pressure refrigerant whose temperature has been removed by the indoor heat exchanger 16 is depressurized by the expansion valve 14 to change into a low-temperature low-pressure refrigerant. The refrigerant flowing into the outdoor heat exchanger 22 through the expansion valve 14 is heated by heat exchange with the outdoor air. In this case, the outdoor heat exchanger 22 functions as an evaporator. Then, the gas refrigerant, which is mainly low in temperature, is sucked into the compressor 11 from the outdoor heat exchanger 22 via the accumulator 15.
As shown in fig. 4, in the cooling mode of the air conditioner 1, the high-temperature and high-pressure refrigerant discharged from the compressor 11 flows into the outdoor heat exchanger 22 through the four-way valve 29 to become a low-temperature and high-pressure liquid refrigerant. In this case, the outdoor heat exchanger 22 functions as a condenser. The low-temperature low-pressure liquid refrigerant passing through the expansion valve 14 flows into the indoor heat exchanger 13. At this time, the indoor heat exchanger 16 functions as an evaporator. Then, the low-temperature low-pressure gas refrigerant is sucked into the compressor 11 from the indoor heat exchanger 16 via the accumulator 15.
In an embodiment, the outdoor unit 2 of the present application further includes an outdoor rear net 24. As shown in fig. 5, an outdoor rear net 24 is provided at the outside of the outdoor heat exchanger 22 to prevent the heat radiating fins of the outdoor heat exchanger 22 from being deformed or damaged when the outdoor unit 1 collides with the outside during transportation or installation.
When the outdoor environment temperature is low in winter and the air conditioner 1 operates in a heating mode for a long time, the outdoor rear net 24 is possibly frosted and even frozen under the influence of severe environments such as frosting, rain and snow of the outdoor heat exchanger 22, but due to the influence of an installation gap between the outdoor heat exchanger 22 and the outdoor rear net 24, after the defrosting of the outdoor heat exchanger 22 of the air conditioner 1 is finished, the outdoor rear net 24 is separated from a heat source, so that the frost on the outdoor rear net 24 cannot be melted, after a plurality of continuous operation periods, the frosting on the outdoor rear net 24 is more and even an ice shell is formed to wrap the outdoor heat exchanger 22, so that the heat exchange rate of the outdoor heat exchanger 22 is seriously attenuated, the heating capacity of the air conditioner 1 is reduced, the user experience is influenced, the frosting speed of the outdoor heat exchanger 22 is accelerated, a vicious cycle is formed, and finally the air conditioner 1 is invalid.
In order to solve the above-described problems, the present application is configured such that the controller 50 performs defrosting during the operation of the heating mode of the air conditioner 1 by the following steps.
First, in each operation cycle, the compressor operation time period is recorded, and the current operated time period of the compressor 11 is recorded when the defrosting temperature condition is satisfied for the first time.
Among them, for the operation cycle, the present application takes the period from the start of the compressor 11 to the end of defrosting as an operation cycle. The defrosting temperature condition may be understood as a temperature condition in which the air conditioner 1 enters defrosting. The operated period of the compressor 11 is an operation period in which the compressor 11 has been operated when the defrosting temperature condition is satisfied for the first time by the air conditioner 1, that is, the period of time taken from when the compressor 11 is started to when the defrosting temperature condition is satisfied by the air conditioner 1 during the operation period is recorded as the operated period of time of the compressor.
Secondly, if it is determined that the operation time periods of the compressor 11 in the continuous N operation periods all meet the back net frost condition, it is indicated that the frost formed on the outdoor back net 24 has seriously affected the heating amount of the air conditioner 1. Wherein N is a positive integer greater than 1.
The back net frosting condition is understood to be a condition in which frosting exists on the outdoor back net 24. N is a value preset according to experiments, and is not limited thereto, and N may be 2 or 3.
Specifically, in the operation heating mode of the air conditioner 1, the outdoor rear net 24 may be frosted or frozen due to the influence of factors such as low temperature rain and snow weather, deformation of the outdoor unit rear net installation, etc., and in the conventional defrosting mode, after the frost on the outdoor heat exchanger 22 is melted, the heat source of the outdoor rear net 24 is separated, so that the frost on the outdoor rear net 24 cannot be timely and effectively removed, and after multiple cycles, the outdoor rear net 24 may be frozen, thereby affecting the heat exchange efficiency of the outdoor heat exchanger 22. In order to solve the above problems, the present application judges whether the outdoor back net 24 is frosted by the operating time of the compressor when the defrosting temperature condition is reached in the operating cycle, so that the subsequent defrosting operation of the outdoor back net 24 can be performed in time when the outdoor back net 24 is determined to be frosted, thereby effectively solving the problem of frosting of the outdoor back net 24.
For example, when the air conditioner 1 is operated in the heating mode, the controller 50 detects whether the defrosting temperature condition is satisfied, records the operated time period t ' of the compressor in the current operation period immediately after the defrosting temperature condition is reached, the operated time period t ' is used as an important condition for determining whether the outdoor back net of the air conditioner 1 frosts, and adds 1 to the accumulated number of times when the operated time period t ' of the compressor in each operation period satisfies the back net frosting condition until the accumulated number of times reaches N, and the controller 50 performs the defrosting of the outdoor back net 24 when the air conditioner 1 is subsequently defrosted. Taking N as 2 as an example, if the running duration t' of the compressor 11 in each running period satisfies the back net frosting condition in 2 running periods continuously, it indicates that the outdoor back net 24 frosts, and the frosting amount of the outdoor back net 24 causes the air intake amount of the air conditioner 1 to be reduced, and affects the heat exchange efficiency of the outdoor heat exchanger 22, so the controller 50 considers that the defrosting action of the outdoor back net 24 needs to be executed when defrosting the air conditioner 1, so as to avoid the vicious circle of the frosting state of the outdoor back net 24; if the operated time period of the compressor 11 of the current operation cycle does not satisfy this condition, the record number is cleared.
Next, the air conditioner 1 is controlled to enter a first defrosting mode, wherein the first defrosting mode includes a basic defrosting stage and a back net defrosting stage.
The basic defrosting stage is understood to be a stage of defrosting the outdoor heat exchanger 22 and the radiating fins in the prior art, and the post-net defrosting stage is understood to be a stage of defrosting the outdoor post-net 24 added to the prior art of defrosting the outdoor heat exchanger 22 and the radiating fins.
Specifically, in the existing defrosting mode, when the defrosting temperature condition is met and the current operation time of the compressor reaches the preset operation time, the air conditioner can be controlled to enter the defrosting mode, and the situation of outdoor back net frosting is not considered, however, in the application, the influence of the back net frosting on the air conditioner 1 is considered, in the process that the air conditioner 1 meets the defrosting temperature condition and the current operation time of the compressor 11 does not reach the preset operation time, the judgment process of the outdoor back net frosting condition is added, namely, in the process, the controller 50 judges whether frosting occurs on the outdoor back net 24 by the operation time of the compressor 11 when the defrosting temperature condition is met in the operation period, and the compressor 11 is always in the operation state, the controller 50 records the current operation time of the compressor 11 in real time, and further, the controller 50 controls the air conditioner 1 to enter the first defrosting mode when the operation time of the compressor 11 meets the back net frosting condition in the continuous N operation periods, and the first defrosting mode comprises both a basic defrosting stage and a back net stage, so that in the first defrosting mode, the heat exchanger 22 can be basically defrosted, the outdoor net 24 can be effectively defrosted, and the outdoor net 2 can be effectively defrosted, and the outdoor heat exchanger can be effectively defrosted, and the outdoor net can be effectively and the outdoor heat exchanger is prevented from being polluted, and the outdoor heat exchanger is greatly improved.
According to the air conditioner 1 of the embodiment of the invention, when the air conditioner 1 is in the heating mode, the frosting condition of the outdoor back net 24 is judged by the operated time length of the compressor 11 when the defrosting temperature condition is met in the operation period, and when the operated time length of the compressor 11 in the continuous N operation periods is determined to meet the back net frosting condition, the frosting quantity of the outdoor back net 24 can be determined to seriously influence the heating effect of the air conditioner 1, so that the air conditioner 1 is controlled to enter the first defrosting mode, both the radiating fins of the outdoor heat exchanger 22 and the outdoor back net 24 are defrosted, the frosting on the outdoor back net 24 is effectively removed, the vicious circle is avoided, the heating effect of the air conditioner 1 is improved, and the comfort experience of a user is improved.
In some embodiments, the controller 50 is further configured such that the controller 50 performs the first defrost mode by the following steps.
The air conditioner 1 enters a basic defrosting stage, controls the air conditioner 1 to operate in a refrigerating mode, controls the compressor 11 to operate to defrosting frequency, controls the outdoor fan 21 to stop operating until the air conditioner 1 meets a basic defrosting end condition, and completes the basic defrosting stage, thereby completing the defrosting effect of the outdoor heat exchanger 22 through the basic defrosting stage.
The basic defrost end condition is a condition for determining that frost on the outdoor heat exchanger 22 and the radiating fins has been removed.
After the basic defrosting stage is finished, the air conditioner 1 does not finish the defrosting process, but enters the post-net defrosting stage, and the controller 50 controls the outdoor fan 21 to reversely operate to blow heat generated when the refrigerant in the outdoor heat exchanger 22 is condensed to the outdoor post-net 24 to melt frost formed on the outdoor post-net 24.
Further, after determining that the reverse operation duration of the outdoor fan 21 reaches the preset operation duration, it is indicated that frost on the outdoor back net 24 is removed, so that the operation duration of the compressor is controlled to be cleared, the air conditioner 1 is controlled to exit the first defrosting mode, the air conditioner 1 finishes the whole defrosting mode so far, the next operation period is entered, and meanwhile, frost on the outdoor back net 24 is effectively removed, so that vicious circle is avoided.
The reverse operation period may be understood as an operation period during which the outdoor fan 21 is reversely rotated. The preset operation time period is a time period preset according to experience, and is not limited thereto. The operation rotation speed at the time of controlling the reverse operation of the outdoor fan 21 may be set by the system according to actual demands.
In the embodiment, with the annual improvement of energy efficiency level, the outdoor fan 21 of the air conditioner 1 adopts a brushless direct current motor, and the motor has excellent speed regulation performance, and can easily realize forward and reverse rotation on the basis of not increasing cost, thereby providing a basis for realizing the invention.
For example, the controller 50 determines that the reverse operation duration t2 of the outdoor fan 21 is greater than or equal to the preset operation duration t_s2, that is, t2 is greater than or equal to t_s2, which indicates that frost formed on the outdoor rear net 24 has been removed, controls the compressor operation duration to clear, and completes the rear net defrosting stage, so far, the frost on the outdoor heat exchanger 22 of the air conditioner 1 and the outdoor rear net 24 is completely removed, controls the air conditioner 1 to exit the first defrosting mode, and returns the air conditioner 1 to the normal heating mode.
In some embodiments, the post-net frosting condition is: the first set time length is less than or equal to the running time length of the compressor and less than or equal to the second set time length, wherein the second set time length is less than the preset running time length.
The first set duration is a duration preset according to experience, and it should be noted that the setting of the first set duration needs to avoid the rapid decrease time of the outdoor coil temperature caused by the rapid frequency rising of the compressor 11. The second set time period is a time period preset according to experience.
For example, the controller 50 determines whether the outdoor back net 24 is frosted according to the operated duration of the compressor 11, and if the operated duration of the compressor 11 is greater than or equal to the first set duration and the operated duration of the compressor 11 is less than or equal to the second set duration, that is, the operated duration of the compressor 11 is within the range of [ t_s0, t_s1], it indicates that the outdoor back net 24 is frosted.
In some embodiments, the temperature difference Δt between the outdoor coil temperature t_p and the outdoor ambient temperature t_e may be calculated, for example, may be expressed as Δt=t_e-t_p, and if the outdoor coil temperature t_p reaches a first preset temperature lower limit value, i.e., t_p is less than or equal to a first preset temperature t_s1, and the temperature difference Δt between the outdoor coil temperature and the outdoor ambient temperature reaches a preset temperature difference upper limit value, i.e., Δt is less than or equal to a preset temperature difference Δt_s, it is determined that the air conditioner 1 satisfies the defrosting temperature condition for entering the defrosting mode. When the two temperature conditions are satisfied, the operation time of the compressor is shorter than the prediction time, and if N operation periods continuously appear to satisfy the back net frosting condition, the air inlet of the air conditioner 1 is judged to be affected, namely, the outdoor back net 24 is judged to be frosted.
As shown with reference to fig. 2, the outdoor coil temperature t_p may be detected by an outdoor coil temperature sensor 28 provided on the outdoor heat exchanger 22 of the air conditioner 1, and the detected outdoor coil temperature t_p may be transmitted to the controller 50 of the air conditioner 1. The outdoor ambient temperature t_e may be detected by an outdoor ambient temperature sensor 27 provided on the outdoor heat exchanger 22 of the air conditioner 1, and the detected outdoor ambient temperature t_e is transmitted to the controller 50 of the air conditioner 1.
And, in the basic defrosting stage, when it is determined that the outdoor coil temperature t_p reaches the second preset upper temperature limit, that is, t_p is greater than or equal to the second preset temperature t_s2, the air conditioner 1 indicates that the frost on the outdoor heat exchanger 22 has been removed, and then determines that the basic defrosting stage is finished.
The preset temperature difference is a temperature difference value preset according to experience, and is not limited. The first preset temperature is a temperature value preset empirically, and is not limited thereto. The second preset temperature is a temperature value preset empirically, and is not limited thereto.
In some embodiments, if it is determined that the operating time periods of the compressor 11 in the N non-continuous operating periods all meet the back-net frosting condition, it is indicated that the outdoor back-net 24 is not frosted or the frosting degree of the outdoor back-net 24 does not affect the heat exchange rate of the outdoor heat exchanger 22, and defrosting of the outdoor back-net 24 is not needed, so that after it is determined that the current operating time period of the compressor 11 reaches the preset operating time period, the air conditioner 1 is controlled to enter the second defrosting mode.
The current operation time of the compressor 11 is understood to be the recorded time of the real-time operation of the compressor 11. The preset operation time period is a time period set based on experience, and is not limited thereto. The second defrosting mode may be understood as a mode in which the outdoor heat exchanger 22 and the radiating fins are defrosted in the conventional art, that is, the second defrosting mode is to defrost only the outdoor heat exchanger 22 and the radiating fins.
Further, in the second defrosting mode, the controller 50 controls the air conditioner 1 to operate in the cooling mode, controls the compressor 11 to operate to defrost frequency, controls the outdoor fan 21 to stop operating, and when the air conditioner 1 meets the basic defrosting end condition, indicates that frost on the outdoor heat exchanger 22 and the radiating fins is eliminated, so that the operation duration of the compressor is controlled to be cleared, and controls the air conditioner 1 to exit the second defrosting mode to finish defrosting the outdoor heat exchanger 22.
An embodiment of the second aspect of the present invention provides a defrosting control method for an air conditioner, as shown in fig. 6, where the method at least includes steps S1 to S3.
Step S1, in the operation and heating mode process of the air conditioner, in each operation period, the operation duration of the compressor is recorded, and when the defrosting temperature condition is met for the first time, the current operation duration of the compressor is recorded.
Specifically, the time period from when the compressor starts to operate to when the air conditioner first satisfies the defrosting temperature condition is recorded as the operated time period of the compressor in the current operation period.
And S2, determining that the running time lengths of the compressors in the continuous N running periods all meet the post-net frosting condition, wherein N is a positive integer greater than 1.
Specifically, in the operation heating mode of the air conditioner, the outdoor back net may be frosted or frozen due to the influence of factors such as low temperature rain and snow weather, the mounting deformation of the outdoor unit back net, etc., and when the frost on the condenser (evaporator) and the radiating fins of the outdoor unit is melted, the heat source of the outdoor back net is separated, so that the frost on the outdoor back net cannot be timely and effectively removed, and the outdoor back net may be frozen after multiple cycles, thereby affecting the heat exchange efficiency of the air conditioner. In order to solve the problems, the application judges whether the outdoor back net frosts or not by judging the running time of the compressor when the defrosting temperature condition is reached in the running period, thereby being convenient for executing the operation of defrosting the back net in time when the outdoor back net frosts are confirmed later, and effectively solving the problem of the back net frosts.
For example, after the air conditioner is operated in the heating mode, the controller detects whether the defrosting temperature condition is satisfied, immediately records the operated time period t ' of the compressor in the current operation period once the defrosting temperature condition is reached, the operated time period t ' is used as an important condition for judging whether the outdoor back net of the air conditioner frosts, when the operated time period t ' of the compressor in each operation period satisfies the back net frosting condition, the accumulated time is increased by 1, and when the accumulated time reaches N, the controller can defrost the outdoor back net when the air conditioner is defrosted subsequently. If N is 2 as an example, if the running duration of the compressor in each running period satisfies the back net frost condition in 2 continuous running periods, the outdoor back net frost is described, and the air intake amount of the air conditioner is reduced due to the frosting amount of the outdoor back net, and the heat exchange efficiency of the outdoor heat exchanger is affected, so that the controller considers that the defrosting action of the outdoor back net needs to be executed when defrosting the air conditioner, so as to avoid vicious circle of the back net frost state; and if the running time of the compressor in the current running period does not meet the condition, clearing the recorded times.
And S3, controlling the air conditioner to enter a first defrosting mode, wherein the first defrosting mode comprises a basic defrosting stage and a back net defrosting stage.
Specifically, in the existing defrosting mode, when the defrosting temperature condition is met and the current operation time of the compressor reaches the preset operation time, the air conditioner can be controlled to enter the defrosting mode, and the situation of outdoor back net frosting is not considered, however, in the application, the influence of the back net frosting on the air conditioner is considered, in the process that the air conditioner meets the defrosting temperature condition and the current operation time of the compressor does not reach the preset operation time, the judgment process of the outdoor back net frosting condition is increased, namely, in the process, the controller can judge whether the outdoor back net frosting is carried out by the operation time of the compressor when the operation time reaches the defrosting temperature condition in the operation period, and the compressor is always in the operation state, the controller records the current operation time of the compressor in real time, and then, the controller controls the air conditioner to enter the first defrosting mode when the operation time of the compressor is determined to meet the back net frosting condition in N operation periods, and the first defrosting mode comprises a basic defrosting stage and a back net defrosting stage, so that in the first defrosting mode, the outdoor heat exchanger and the fins can be effectively removed after the heat exchanger is cooled, the outdoor heat exchanger is effectively cooled, and the outdoor heat exchanger is prevented from being frosted, and the outdoor heat exchanger is polluted, and the outdoor heat exchanger is effectively cooled.
According to the defrosting control method for the air conditioner, when the air conditioner is in a heating mode, the frosting condition of the outdoor back net is judged by the running time of the compressor when the defrosting temperature condition is met in the running period, when the running time of the compressor in the continuous N running periods is confirmed to meet the back net frosting condition, the frosting quantity of the outdoor back net can be confirmed to seriously influence the heating effect of the air conditioner, so that the air conditioner is controlled to enter a first defrosting mode, the outdoor heat exchanger, the radiating fins and the outdoor back net are defrosted, frost formed on the outdoor back net is effectively removed, vicious circulation is avoided, the heating effect of the air conditioner is improved, and the comfort experience of a user is improved.
In some embodiments, the air conditioner is controlled to enter a first defrost mode, as shown in fig. 7, the method comprising at least steps S4-S6.
And S4, entering a basic defrosting stage, controlling the air conditioner to operate in a refrigerating mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating until the air conditioner meets a basic defrosting ending condition.
And S5, entering a post-net defrosting stage, and controlling the outdoor fan to reversely operate so as to blow heat generated during condensation of the refrigerant in the outdoor heat exchanger to the outdoor post-net to melt frost formed on the outdoor post-net.
In the embodiment, with the annual improvement of energy efficiency level, the outdoor fan of the air conditioner adopts a brushless direct current motor, the motor has excellent speed regulation performance, and forward and reverse rotation can be easily realized on the basis of not increasing cost, thereby providing a basis for realizing the invention.
And S6, determining that the reverse operation time of the outdoor fan reaches the preset operation time, controlling the operation time of the compressor to be cleared, controlling the air conditioner to exit the first defrosting mode, and entering the next operation period.
For example, the controller determines that the reverse operation duration t2 of the outdoor fan is greater than or equal to the preset operation duration t_s2, that is, t2 is greater than or equal to t_s2, which indicates that frost formed by the outdoor back-net has been removed, controls the compressor to perform zero clearing on the operation duration, completes the back-net defrosting stage, and enters the next operation period, so far, the frost of the outdoor heat exchanger 22 and the outdoor back-net 24 of the air conditioner is completely removed, controls the air conditioner to exit the first defrosting mode, and the air conditioner is restored to the normal heating mode.
In some embodiments, the post-net frosting condition is: the first set time length is less than or equal to the running time length of the compressor and less than or equal to the second set time length, wherein the second set time length is less than the preset running time length.
The controller judges whether the outdoor back net frosts according to the running time of the compressor, if the running time of the compressor is longer than or equal to the first set time, and the running time of the compressor is shorter than or equal to the second set time, namely, the running time of the compressor is within the range of [ t_s0, t_s1], the outdoor back net frosts are indicated.
In some embodiments, the temperature difference Δt between the outdoor coil temperature t_p and the outdoor ambient temperature t_e may be calculated, for example, may be expressed as Δt=t_e-t_p, and if the outdoor coil temperature t_p reaches a first preset temperature lower limit value, i.e., t_p is less than or equal to a first preset temperature t_s1, and the temperature difference Δt between the outdoor coil temperature and the outdoor ambient temperature reaches a preset temperature difference upper limit value, i.e., Δt is less than or equal to a preset temperature difference Δt_s, it is determined that the air conditioner satisfies the defrosting temperature condition for entering the defrosting mode. And when the two temperature conditions are met, the running time of the compressor is shorter than the predicted time, and if N running periods continuously appear to meet the rear net frosting condition, the air inlet of the air conditioner is judged to be affected, namely the outdoor rear net frosting is judged.
And in the basic defrosting stage, when the temperature T_p of the outdoor coil reaches the second preset upper temperature limit value, namely, when the temperature T_p is more than or equal to the second preset temperature T_s2, the air conditioner indicates that the frost on the condenser and the radiating fins of the outdoor unit is cleared, and then the basic defrosting stage is finished.
In some embodiments, if it is determined that the running durations of the compressors in the N non-continuous running periods all meet the back net frosting condition, it is indicated that the outdoor back net is not frosted or the frosting degree of the outdoor back net does not affect the heat exchange rate of the outdoor heat exchanger, defrosting of the outdoor back net is not needed, and then after it is determined that the current running duration of the compressors reaches the preset running duration, the air conditioner is controlled to enter the second defrosting mode.
Further, in the second defrosting mode, the controller controls the air conditioner to operate in a refrigerating mode, controls the compressor to operate to defrosting frequency, controls the outdoor fan to stop operating, and when the air conditioner meets a basic defrosting end condition, indicates that frost on the outdoor heat exchanger and the radiating fins is eliminated, so that the operation duration of the compressor is controlled to be cleared, and controls the air conditioner to exit the second defrosting mode to finish defrosting of the outdoor heat exchanger.
The defrosting control method for an air conditioner according to an embodiment of the present invention is illustrated with reference to fig. 8, and the following details are given.
Step S7, the air conditioner operates in a heating mode.
Step S8, starting to accumulate the operation time of the compressor.
And S9, judging whether the running time of the compressor is greater than or equal to t_s0, if so, executing the step S10, otherwise, continuing to execute the step S9.
Step S10, detecting a defrosting temperature condition for executing the defrosting mode, that is, determining whether the outdoor coil temperature is less than or equal to a first preset temperature t_s1, and whether the temperature difference Δt between the outdoor coil temperature and the outdoor ambient temperature is greater than or equal to a preset temperature difference Δt_s. If the defrosting temperature condition is satisfied, step S11 is executed, and otherwise step S8 is executed.
Step S11, recording the current running time of the compressor.
Step S12, judging whether the running time length of the compressor meets the post-net frost condition, namely, whether the running time length t 'of the compressor meets t_s0 is less than or equal to t'. Less than or equal to t_s1, if so, executing step S14, otherwise, executing step S13.
Step S13, the recorded accumulated times n are cleared, and step S15 is executed.
In step S14, the accumulated number n is increased by 1.
Step S15, judging whether the accumulated times N is larger than N, if so, executing step S16, otherwise, executing step S17.
Step S16, outdoor back-net defrosting is needed, and step S19 is executed.
Step S17, the outdoor back net defrosting is not needed, and step S18 is executed.
Step S18, judging whether the current operation time t of the compressor is greater than the preset operation time t_s, if yes, executing step S19, otherwise executing step S8.
Step S19, entering a defrosting mode, operating the air conditioner in a refrigerating mode, and controlling the outdoor fan to stop operating by the controller.
Step S20, determining whether the outdoor coil temperature t_p is greater than or equal to the second preset temperature t_s2, if yes, executing step S21, otherwise executing step S19.
Step S21, judging whether to execute outdoor back net defrosting, if yes, executing step S22, otherwise executing step S24.
And S22, the controller controls the outdoor fan to reversely run, the rotating speed can be set through the system according to actual requirements, and the recorded accumulated times n are cleared.
Step S23, judging whether the reverse operation time t2 of the outdoor fan is greater than or equal to the preset operation time t_s2, if yes, executing step S24, otherwise executing step S22.
And step S24, the controller controls the compressor to run for zero clearing.
Step S25, the air conditioner exits the defrosting mode and returns to the execution of step S8.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. An air conditioner, comprising:
an indoor unit including an indoor heat exchanger;
the outdoor unit comprises a compressor, an outdoor heat exchanger, an outdoor fan and an outdoor back net;
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator and the four-way valve;
The controller is configured to record the operation time length of the compressor in each operation period in the operation heating mode process of the air conditioner, and record the current operation time length of the compressor when the defrosting temperature condition is met for the first time;
determining that the running time lengths of the compressors in the continuous N running periods all meet the post-net frosting condition, wherein N is a positive integer greater than 1;
controlling the air conditioner to enter a first defrosting mode, wherein the first defrosting mode comprises a basic defrosting stage and a back net defrosting stage;
upon controlling the air conditioner to enter a first defrost mode, the controller is further configured to:
entering the basic defrosting stage, controlling the air conditioner to operate in a refrigerating mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating until the air conditioner meets a basic defrosting ending condition;
entering the back net defrosting stage, and controlling the outdoor fan to reversely run;
determining that the reverse operation time length of the outdoor fan reaches a preset operation time length, controlling the operation time length of the compressor to be cleared, controlling the air conditioner to exit the first defrosting mode, and entering the next operation period.
2. The air conditioner according to claim 1, wherein the rear net frost condition is: the first set duration is less than or equal to the operated duration of the compressor and less than or equal to the second set duration.
3. An air conditioner according to claim 2, wherein,
the defrosting temperature conditions are as follows: the temperature of the outdoor coil reaches a first preset temperature lower limit value, and the temperature difference value between the temperature of the outdoor coil and the outdoor environment temperature reaches a preset temperature difference upper limit value;
the basic defrosting end conditions are: the outdoor coil temperature reaches a second preset upper temperature limit.
4. The air conditioner of any one of claims 1-3, wherein the controller is further configured to:
determining that the running time lengths of the compressors in the discontinuous N running periods all meet the post-net frosting condition;
after determining that the current operation time of the compressor reaches the preset operation time, controlling the air conditioner to enter a second defrosting mode, wherein in the second defrosting mode, controlling the air conditioner to operate in a refrigerating mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating;
and determining that the air conditioner meets a basic defrosting ending condition, controlling the running duration of the compressor to be cleared, and controlling the air conditioner to exit the second defrosting mode.
5. A defrosting control method of an air conditioner, comprising:
in the operation and heating mode of the air conditioner, in each operation period, the operation time of the compressor is recorded, and when the defrosting temperature condition is met for the first time, the current operation time of the compressor is recorded;
determining that the running time lengths of the compressors in the continuous N running periods all meet the post-net frosting condition, wherein N is a positive integer greater than 1;
controlling the air conditioner to enter a first defrosting mode, wherein the first defrosting mode comprises a basic defrosting stage and a back net defrosting stage;
controlling the air conditioner to enter a first defrosting mode, comprising:
entering the basic defrosting stage, controlling the air conditioner to operate in a refrigerating mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating until the air conditioner meets a basic defrosting ending condition;
entering the back net defrosting stage, and controlling the outdoor fan to reversely run;
and determining that the reverse operation time length of the outdoor fan reaches a preset operation time length, controlling the operation time length of the compressor to be cleared, and controlling the air conditioner to exit the first defrosting mode.
6. The defrosting control method of claim 5, wherein the back net defrosting condition is: the first set duration is less than or equal to the operated duration of the compressor and less than or equal to the second set duration.
7. The defrosting control method of an air conditioner as claimed in claim 6, wherein,
the defrosting temperature conditions are as follows: the temperature of the outdoor coil reaches a first preset temperature lower limit value, and the temperature difference value between the temperature of the outdoor coil and the outdoor environment temperature reaches a preset temperature difference upper limit value;
the basic defrosting end conditions are: the outdoor coil temperature reaches a second preset upper temperature limit.
8. The defrosting control method for an air conditioner according to any one of claims 5 to 7, wherein,
determining that the running time lengths of the compressors in the discontinuous N running periods all meet the post-net frosting condition;
after determining that the current operation time of the compressor reaches the preset operation time, controlling the air conditioner to enter a second defrosting mode, wherein in the second defrosting mode, controlling the air conditioner to operate in a refrigerating mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating;
and determining that the air conditioner meets a basic defrosting ending condition, controlling the running duration of the compressor to be cleared, and controlling the air conditioner to exit the second defrosting mode.
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| CN105135628A (en) * | 2015-09-28 | 2015-12-09 | Tcl空调器(中山)有限公司 | Air conditioner and defrosting control method of air conditioner |
| CN110470014A (en) * | 2019-08-03 | 2019-11-19 | 青岛海尔空调器有限总公司 | Control method and device, air-conditioning for air-conditioner defrosting |
| JP2019219129A (en) * | 2018-06-21 | 2019-12-26 | シャープ株式会社 | Air conditioner |
| CN212692066U (en) * | 2020-02-27 | 2021-03-12 | 海南翰洋智能环境科技有限公司 | Defrosting device for air conditioner refrigeration |
| CN113266932A (en) * | 2021-05-18 | 2021-08-17 | 海信（山东）空调有限公司 | Method and device for controlling defrosting of air conditioner, storage medium and air conditioner |
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- 2022-05-30 CN CN202210605555.3A patent/CN114909776B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105135628A (en) * | 2015-09-28 | 2015-12-09 | Tcl空调器(中山)有限公司 | Air conditioner and defrosting control method of air conditioner |
| JP2019219129A (en) * | 2018-06-21 | 2019-12-26 | シャープ株式会社 | Air conditioner |
| CN110470014A (en) * | 2019-08-03 | 2019-11-19 | 青岛海尔空调器有限总公司 | Control method and device, air-conditioning for air-conditioner defrosting |
| CN212692066U (en) * | 2020-02-27 | 2021-03-12 | 海南翰洋智能环境科技有限公司 | Defrosting device for air conditioner refrigeration |
| CN113266932A (en) * | 2021-05-18 | 2021-08-17 | 海信（山东）空调有限公司 | Method and device for controlling defrosting of air conditioner, storage medium and air conditioner |
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