CN114909776A - Air conditioner and defrosting control method thereof - Google Patents

Air conditioner and defrosting control method thereof Download PDF

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Publication number
CN114909776A
CN114909776A CN202210605555.3A CN202210605555A CN114909776A CN 114909776 A CN114909776 A CN 114909776A CN 202210605555 A CN202210605555 A CN 202210605555A CN 114909776 A CN114909776 A CN 114909776A
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China
Prior art keywords
air conditioner
defrosting
outdoor
compressor
temperature
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CN202210605555.3A
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Chinese (zh)
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CN114909776B (en
Inventor
彭琪
田野
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Hisense Guangdong Air Conditioning Co Ltd
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Hisense Guangdong Air Conditioning Co Ltd
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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
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—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 thereof, wherein the air conditioner comprises: an indoor unit including an indoor heat exchanger; the outdoor unit comprises a compressor, an outdoor heat exchanger, an outdoor fan and an outdoor rear net; the controller is configured to record the running time of the compressor in each running period during the operation of the air conditioner in the heating mode, and record the running time of the current compressor when the defrosting temperature condition is met for the first time; determining that the running time lengths of the compressors in N continuous running periods meet a back net frosting condition, wherein N is a positive integer greater than 1; the method comprises the steps of controlling the air conditioner to enter a first defrosting mode, wherein the first defrosting mode comprises a basic defrosting phase and a back net defrosting phase. The air conditioner can solve the problem of frosting of the outdoor rear net and improve the heat exchange rate of the air conditioner.

Description

Air conditioner and defrosting control method thereof
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 radiating fins of the condenser (evaporator) of the outdoor unit of the air conditioner are usually exposed outside, are very sharp, and are easy to deform due to collision in the processes of production, transportation, installation and the like, so that the heat exchange effect is influenced, therefore, an outdoor rear net is adopted in the exposed part to protect the heat radiating fins of the condenser (evaporator) of the outdoor unit from being damaged, but is limited by cost, and the outdoor rear net is usually made of plastic materials and has a dense hole structure, and is easy to slightly deform in the installation process, so that a gap of 0.5-2 cm is formed between the outdoor rear net and the heat radiating fins.
In winter with low outdoor environment temperature, when the air conditioner operates in a heating mode for a long time, the outdoor rear net is frosted or frozen due to the fact that the outdoor heat exchanger is frosted or is in a rainy or snowy severe environment, when the air conditioner executes a defrosting mode to completely melt frost of the outdoor heat exchanger, the outdoor rear net cannot acquire heat generated by the outdoor heat exchanger due to an installation gap between the outdoor heat exchanger and the outdoor rear net, the frost of the outdoor rear net cannot be melted, and after the air conditioner operates in the defrosting mode for multiple times, the frost formed on the outdoor rear net is increased, so that the outdoor rear net needs to be defrosted.
In the related art, an air conditioner usually adopts a reverse cycle defrosting mode, namely a refrigeration mode defrosting mode, the condition that an outdoor heat exchanger needs to be defrosted is judged through fixed or small-range variable compressor running time, outdoor coil temperature and outdoor heat exchange temperature difference, when the reverse cycle defrosting mode is executed, an outdoor fan is controlled to stop running so as to increase heat released by the outdoor heat exchanger, frost of the outdoor heat exchanger is melted, the frost of the outdoor heat exchanger is completely eliminated according to defrosting time and the outdoor coil temperature, the air conditioner exits the defrosting mode and is recovered to a heating mode to run, and the outdoor heat exchange temperature difference is the difference value between outdoor environment temperature and the outdoor coil temperature. However, in the reverse cycle defrosting mode, the frost on the outdoor rear screen 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 influenced, the frosting speed of the outdoor heat exchanger is increased, a vicious cycle is formed, and the air conditioner is damaged.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide an air conditioner, which can solve the problem of frosting of an outdoor rear screen 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 problem, 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 rear net; the refrigerant circulation loop is used 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 running time of the compressor in each running period during the operation of the air conditioner in the heating mode, and record the running time of the current compressor when the defrosting temperature condition is met for the first time; determining that the running time lengths of the compressors in N continuous running periods meet a back 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 phase and a back net defrosting phase.
According to 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 rear net is judged by the running time length of the compressor when the defrosting temperature condition is met in the running period, when the running time lengths of the compressors in N running periods are determined to meet the frosting condition of the rear net, the frosting quantity of the outdoor rear 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 to defrost the outdoor heat exchanger, the radiating fins and the outdoor rear net, the frosting on the outdoor rear net is effectively removed, the vicious circle 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 refrigeration mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating until the air conditioner meets basic defrosting ending conditions; entering the back net defrosting stage, and controlling the outdoor fan to reversely operate; and determining that the reverse operation time of the outdoor fan reaches a preset operation time, controlling the operation time of the compressor to be reset, controlling the air conditioner to exit the first defrosting mode, and entering the next operation period.
In some embodiments, the back-net frosting condition is: the first set time is less than or equal to the running time of the compressor and less than or equal to the second set time.
In some embodiments, the defrost temperature conditions are: 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 condition is as follows: and the temperature of the outdoor coil reaches a second preset upper temperature limit value.
In some embodiments, the controller is further configured to: determining that the running time lengths of the compressors in the discontinuous N running periods meet the back net frosting condition; after the current operation time of the compressor is determined to reach the preset operation time, the air conditioner is controlled to enter a second defrosting mode, wherein in the second defrosting mode, the air conditioner is controlled to operate in a refrigerating mode, the compressor is controlled to operate to defrosting frequency, and the outdoor fan is controlled to stop operating; and determining that the air conditioner meets a basic defrosting ending condition, controlling the running time of the compressor to be reset, 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 process of operating a heating mode of an air conditioner, recording the operation time length of a compressor in each operation period, and recording 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 N continuous running periods meet a back 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 phase and a back net defrosting phase.
According to the defrosting control method of the air conditioner, when the air conditioner is in a heating mode, the frosting condition of the outdoor rear net is judged according to the running time length of the compressor when the defrosting temperature condition is met in the running period, and when the running time lengths of the compressors in N running periods are determined to meet the frosting condition of the rear net, the frosting quantity of the outdoor rear net can be determined to seriously influence the heating effect of the air conditioner, so that the air conditioner is controlled to enter the first defrosting mode after the current running time length of the compressor reaches the preset running time length, the outdoor heat exchanger, the radiating fins and the outdoor rear net are defrosted, the frosting on the outdoor rear net is effectively removed, vicious circle 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 refrigeration mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating until the air conditioner meets basic defrosting ending conditions; entering the back net defrosting stage, and controlling the outdoor fan to reversely operate; and determining that the reverse operation time of the outdoor fan reaches a preset operation time, controlling the operation time of the compressor to be reset, controlling the air conditioner to exit the first defrosting mode, and entering the next operation period.
In some embodiments, the back-net frosting condition is: the first set time is less than or equal to the running time of the compressor and less than or equal to the second set time.
In some embodiments, the defrost temperature conditions are: 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 condition is as follows: and the temperature of the outdoor coil reaches a second preset upper temperature limit value.
In some embodiments, the controller is further configured to: determining that the running time lengths of the compressors in the discontinuous N running periods meet the back net frosting condition; after the current operation time of the compressor is determined to reach the preset operation time, the air conditioner is controlled to enter a second defrosting mode, wherein in the second defrosting mode, the air conditioner is controlled to operate in a refrigerating mode, the compressor is controlled to operate to defrosting frequency, and the outdoor fan is controlled to stop operating; and determining that the air conditioner meets a basic defrosting ending condition, controlling the running time of the compressor to be reset, 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 above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of 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 the structure of an air conditioner according to one embodiment of the present invention;
FIG. 3 is a schematic view of the refrigerant flow direction in a heating mode according to one embodiment of the present invention;
FIG. 4 is a schematic view of the refrigerant flow direction in a cooling mode according to one embodiment of the present 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 flow chart 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 pipe;
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: an outdoor rear 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;
21 a: an outdoor fan motor; 31 a: indoor fan motor.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
The air conditioner performs a refrigeration 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 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 can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the 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 serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
The air conditioner 1 shown in fig. 1 includes: the indoor unit 3 is exemplified by an indoor unit (shown in the figure), and the indoor unit is usually mounted on an indoor wall surface. For another example, an indoor unit (not shown) is also an indoor unit type of the indoor unit. The outdoor unit 2 is generally installed outdoors and 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 the operation of each component in the air conditioner 1 so that each component of the air conditioner 1 can operate to realize each predetermined function of the air conditioner 1.
Further, as shown in fig. 2, the air conditioner 1 is further provided with a compressor 11, an outdoor heat exchanger 22, an expansion valve 14, an accumulator 15, and an indoor heat exchanger 16. Among them, the indoor heat exchanger 16 and the outdoor heat exchanger 22 operate as a condenser or an evaporator, i.e., one operates as a condenser and the other operates as an evaporator. The compressor 11 sucks the 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 with variable capacity that performs rotational speed control by an inverter.
The outdoor heat exchanger 22 has a first inlet and a second outlet for allowing the refrigerant to flow between the refrigerant and the suction port of the compressor 11 via the accumulator 15, and the refrigerant flows between the refrigerant and the expansion valve 14. The outdoor heat exchanger 22 exchanges heat between the outdoor air and the refrigerant flowing through a heat transfer pipe (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 the indoor heat exchanger, and has a first inlet and outlet for allowing the gas refrigerant to flow between the compressor 11 and the discharge port.
An accumulator 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. Then, 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 outdoor air flow passing through the outdoor heat exchanger 22. The outdoor fan 21 is driven by an outdoor fan motor 21a whose rotational speed can be changed. The indoor unit 3 further includes an indoor fan 31, the indoor fan 31 generating 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 signal lines, 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 is cooled by dissipating heat. The low-temperature high-pressure refrigerant deprived of the temperature by the indoor heat exchanger 16 is decompressed by the expansion valve 14 and changes 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. At this time, the outdoor heat exchanger 22 functions as an evaporator. Then, the gas refrigerant mainly having a low temperature is sucked from the outdoor heat exchanger 22 into the compressor 11 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. At this time, the outdoor heat exchanger 22 functions as a condenser. The low-temperature and low-pressure liquid refrigerant passes through the expansion valve 14 and flows into the indoor heat exchanger 13. At this time, the indoor heat exchanger 16 functions as an evaporator. Then, the low-temperature and low-pressure gas refrigerant is sucked from the indoor heat exchanger 16 into the compressor 11 through the accumulator 15.
In an embodiment, the outdoor unit 2 of the present application further includes an outdoor rear screen 24. As shown in fig. 5, the outdoor rear net 24 is disposed outside the outdoor heat exchanger 22 to prevent the 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.
In winter, when the outdoor environment temperature is low and the air conditioner 1 operates in the heating mode for a long time, due to the adverse environment effects such as frosting, rain and snow of the outdoor heat exchanger 22 of the air conditioner, the outdoor rear net 24 may be frosted or even frozen, but due to the effect of the 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 the heat source, so that the frost on the outdoor rear net 24 cannot be melted, after a plurality of continuous operation cycles, the frost on the outdoor rear net 24 is accumulated more and more, even an ice shell is formed to wrap the outdoor heat exchanger 22, therefore, the heat exchange rate of the outdoor heat exchanger 22 is severely reduced, the heating capacity of the air conditioner 1 is reduced, the user experience is affected, the frosting speed of the outdoor heat exchanger 22 is accelerated, a vicious circle is formed, and finally the air conditioner 1 fails.
In order to solve the above problem, the present application, during the air conditioner 1 operates in the heating mode, the controller 50 is configured to perform defrosting by the following steps.
First, in each operation period, the compressor operation time period is recorded, and the current operation time period of the compressor 11 is recorded when the defrosting temperature condition is satisfied for the first time.
Here, for the operation period, the period from the turning on of the compressor 11 to the end of the defrosting is referred to as an operation period in the present application. The defrosting temperature condition may be understood as a temperature condition at which the air conditioner 1 enters defrosting. The operated period of the compressor 11 is an operating period in which the compressor 11 has been operated when the air conditioner 1 first satisfies the defrosting temperature condition, that is, a period from when the compressor 11 is started to when the air conditioner 1 satisfies the defrosting temperature condition during the operation cycle is recorded as the operated period of the compressor.
Secondly, if it is determined that the operating time lengths of the compressor 11 in the N consecutive operating periods all satisfy the rear-net frosting condition, it is determined that the frosting on the outdoor rear net 24 seriously affects the heating capacity of the air conditioner 1. Wherein N is a positive integer greater than 1.
Wherein a back-net frosting condition may be understood as a condition where there is a frosting condition on the outdoor back-net 24. N is a value predetermined by experiment, and is not limited thereto, and N may be 2 or 3.
Specifically, in the air conditioner 1, in the heating mode, the outdoor rear net 24 may be frosted or frozen due to the influence of factors such as low-temperature rain and snow weather and deformation of the outdoor unit rear net, and the conventional defrosting mode is adopted, so that after 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, so that the heat exchange efficiency of the outdoor heat exchanger 22 is influenced. In order to solve the problem, whether the outdoor rear net 24 frosts or not is judged according to the running time of the compressor when the defrosting temperature condition is achieved in the running period, so that the operation of defrosting the outdoor rear net 24 can be timely executed when the frosting of the outdoor rear net 24 is determined, and the problem that the outdoor rear net 24 frosts is effectively solved.
Illustratively, after the air conditioner 1 starts a heating mode to operate, the controller 50 detects whether a defrosting temperature condition is met, once the defrosting temperature condition is met, an operated time t ' of the compressor in a current operation period is recorded immediately, the operated time t ' is used as an important condition for judging whether an outdoor rear screen of the air conditioner 1 is frosted, when the operated time t ' of the compressor in each operation period meets the rear screen frosting condition, the accumulated times are added by 1, and until the accumulated times reach N, the controller 50 defrosts the outdoor rear screen 24 in the subsequent defrosting of the air conditioner 1. If N is 2, for example, in 2 consecutive operation cycles, the running time t' of the compressor 11 in each operation cycle satisfies the rear-net frosting condition, which indicates that the outdoor rear-net 24 is frosted, and the frosting amount of the outdoor rear-net 24 causes the intake air amount of the air conditioner 1 to be decreased, which affects the heat exchange efficiency of the outdoor heat exchanger 22, so that the controller 50 determines that the defrosting operation for the outdoor rear-net 24 is required to be performed when the air conditioner 1 is defrosted, so as to avoid vicious cycle of the frosting state of the outdoor rear-net 24; if the operated time period of the compressor 11 of the current operation period does not satisfy this condition, the number of times of recording is cleared.
Next, the air conditioner 1 is controlled to enter a first defrost mode, wherein the first defrost mode includes a basic defrost phase and a rear net defrost phase.
The basic defrosting stage may be understood as a stage of defrosting the outdoor heat exchanger 22 and the heat dissipation fins in the related art, and the back mesh defrosting stage may be understood as a stage of defrosting the outdoor back mesh 24 added to the related stage of defrosting the outdoor heat exchanger 22 and the heat dissipation fins.
Specifically, in the existing defrosting mode, when the defrosting temperature condition is met and the current running time of the compressor reaches the preset running time, the air conditioner is controlled to enter the defrosting mode, and the frosting condition of the outdoor rear net is not considered, however, the influence of the rear net frosting on the air conditioner 1 is considered in the application, a judgment process for the frosting condition of the outdoor rear net is added in the process that the air conditioner 1 meets the defrosting temperature condition but the current running time of the compressor 11 does not reach the preset running time, that is, in the process, the controller 50 judges whether the outdoor rear net 24 is frosted or not by the running time of the compressor 11 when the defrosting temperature condition is reached in the running period, and the compressor 11 is always in the running state, the controller 50 records the current running time of the compressor 11 in real time, furthermore, the controller 50 determines that the running time of the compressor 11 in N continuous running periods all meets the rear net frosting condition, the air conditioner 1 is controlled to enter the first defrosting mode, and the first defrosting mode includes both the basic defrosting stage and the back screen defrosting stage, so that in the first defrosting mode, the defrosting of the outdoor heat exchanger 22 can be completed in the basic defrosting stage, and in the back screen defrosting stage, the frost on the outdoor back screen 24 can be effectively removed, thereby avoiding the vicious circle of frosting of the outdoor back screen 24, improving the heat exchange effect of the outdoor unit 2, and improving the comfort experience of users.
According to the air conditioner 1 of the embodiment of the invention, when the air conditioner 1 is in a heating mode, the frosting condition of the outdoor rear net 24 is judged by the running time length of the compressor 11 when the defrosting temperature condition is met in the running period, and when the running time lengths of the compressor 11 in N running periods are determined to meet the rear net frosting condition, the frosting quantity of the outdoor rear net 24 can be determined to seriously affect the heating effect of the air conditioner 1, so that the air conditioner 1 is controlled to enter the first defrosting mode to defrost both the radiating fins of the outdoor heat exchanger 22 and the outdoor rear net 24, the frost on the outdoor rear 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 to the controller 50 perform the first defrost mode by the following steps.
The air conditioner 1 enters a basic defrosting stage, the air conditioner 1 is controlled to operate in a refrigeration mode, the compressor 11 is controlled to operate to defrosting frequency, the outdoor fan 21 is controlled to stop operating until the air conditioner 1 meets basic defrosting ending conditions, and the basic defrosting stage is completed, so that the effect of defrosting the outdoor heat exchanger 22 is completed through the basic defrosting stage.
Among them, the basic defrosting end condition is a condition that determines that frost on the outdoor heat exchanger 22 and the heat radiation fins has been removed.
After the basic defrosting stage is finished, the air conditioner 1 does not finish the defrosting process but enters the rear net defrosting stage, and the controller 50 controls the outdoor fan 21 to operate in reverse to blow heat generated when the refrigerant in the outdoor heat exchanger 22 is condensed to the outdoor rear net 24 to melt frost formed on the outdoor rear net 24.
Furthermore, after the reverse operation time of the outdoor fan 21 is determined to reach the preset operation time, it is determined that the frost on the outdoor rear net 24 is removed, so that the operation time of the compressor is controlled to be reset, the air conditioner 1 is controlled to exit from the first defrosting mode, the air conditioner 1 finishes the whole defrosting mode and enters the next operation period, and meanwhile, the frost on the outdoor rear net 24 is effectively removed, and vicious circle is avoided.
Here, the reverse operation time period may be understood as an operation time period in which the outdoor fan 21 is rotated in the reverse direction. The preset operation time is a time preset according to experience, and is not limited to this. The operation speed at the time of controlling the reverse operation of the outdoor fan 21 may be set by the system according to actual demand.
In the embodiment, as the energy efficiency grade is improved year by year, the outdoor fan 21 of the air conditioner 1 adopts a brushless direct current motor which has excellent speed regulation performance and can easily realize forward and reverse rotation on the basis of not increasing the cost, thereby providing a basis for realizing the invention.
For example, the controller 50 determines that the reverse operation time period t2 of the outdoor fan 21 is greater than or equal to the preset operation time period t _ s2, that is, t2 is greater than or equal to t _ s2, which indicates that the frost formed on the outdoor rear net 24 is eliminated, controls the operation time period of the compressor to be cleared, and completes the rear net defrosting stage, so far, the frost on the outdoor heat exchanger 22 and the outdoor rear net 24 of the air conditioner 1 is completely eliminated, controls the air conditioner 1 to exit from the first defrosting mode, and returns the air conditioner 1 to the normal heating mode.
In some embodiments, the back-net frosting condition is: the first set time is less than or equal to the operated time of the compressor and less than or equal to a second set time, wherein the second set time is less than the preset operated time.
The first set time period is a preset time period according to experience, and it should be noted that the first set time period needs to be set to avoid the rapid temperature decrease time of the outdoor coil caused by the rapid frequency increase 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 rear net 24 is frosted by the operated time period of the compressor 11, and if the operated time period of the compressor 11 is greater than or equal to the first set time period and the operated time period of the compressor 11 is less than or equal to the second set time period, that is, the operated time period of the compressor 11 is within the range of [ t _ s0, t _ s1], it indicates that the frosting occurs on the outdoor rear net 24.
In some embodiments, it may be determined that the air conditioner 1 satisfies the defrosting temperature condition for entering the defrosting mode by obtaining the outdoor coil temperature T _ p and the outdoor environment temperature T _ e, and calculating a temperature difference value Δ T between the outdoor coil temperature T _ p and the outdoor environment temperature T _ e, which may be represented as Δ T ═ T _ e-T _ p, if the outdoor coil temperature T _ p reaches a first preset lower temperature limit value, i.e., T _ p ≦ first preset temperature T _ s1, and a temperature difference value Δ T between the outdoor coil temperature and the outdoor environment temperature reaches a preset upper temperature limit value, i.e., Δ T ≧ preset temperature difference Δ T _ s. Further, when the two temperature conditions are satisfied, the operation time of the compressor is shorter than the prediction time, and if the back screen frosting condition is satisfied for N operation cycles continuously, it is determined that the intake air of the air conditioner 1 is affected, that is, it is determined that the outdoor back screen 24 is frosted.
Here, referring 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 is 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 the outdoor coil temperature T _ p is determined to reach the second preset upper temperature limit value, i.e. T _ p is greater than or equal to the second preset temperature T _ s2, it indicates that the frost on the outdoor heat exchanger 22 is removed, i.e. it is determined 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 lengths of the compressor 11 in the non-consecutive N operating periods all satisfy the rear-screen frosting condition, it indicates that the outdoor rear screen 24 is not frosted or the frosting degree of the outdoor rear screen 24 does not affect the heat exchange rate of the outdoor heat exchanger 22, and it is not necessary to defrost the outdoor rear screen 24, and then after it is determined that the current operating time length of the compressor 11 reaches the preset operating time length, the air conditioner 1 is controlled to enter the second defrosting mode.
The current operation time period of the compressor 11 may be understood as the recorded time period 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 conventional mode for defrosting the outdoor heat exchanger 22 and the heat radiating fins, that is, the second defrosting mode is a mode for defrosting only the outdoor heat exchanger 22 and the heat 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 the defrosting frequency, and controls the outdoor fan 21 to stop operating, and when the air conditioner 1 meets the basic defrosting end condition, it indicates that frost on the outdoor heat exchanger 22 and the heat dissipation fins is eliminated, so that the operation duration of the compressor is controlled to be cleared, and the air conditioner 1 is controlled to exit the second defrosting mode, and defrosting of the outdoor heat exchanger 22 is completed.
In a second embodiment of the present invention, a defrosting control method for an air conditioner is provided, as shown in fig. 6, the method at least includes steps S1 to S3.
And step S1, in the process of the air conditioner running heating mode, in each running period, recording the running time of the compressor, and recording the running time of the current compressor when the defrosting temperature condition is met for the first time.
Specifically, in the current operation period, the time period from the start operation of the compressor to when the air conditioner first satisfies the defrosting temperature condition is recorded as the operated time period of the compressor.
And step S2, determining that the running time lengths of the compressors in N continuous running periods all meet the back net frosting condition, wherein N is a positive integer greater than 1.
Specifically, in the process of the air conditioner in the heating mode, the outdoor rear net can be frosted or frozen under the influence of factors such as low-temperature rain and snow weather, outdoor unit rear net installation deformation and the like, a conventional defrosting mode is adopted, when frost on an outdoor unit condenser (evaporator) and a radiating fin is completely melted, a heat source of the outdoor rear net is separated, so that the frost on the outdoor rear net cannot be timely and effectively removed, the outdoor rear net can be frozen after multiple cycles, and the heat exchange efficiency of the air conditioner is influenced. In order to solve the problems, whether the outdoor rear net frosts or not is judged according to the running duration of the compressor when the defrosting temperature condition is achieved in the running period, so that the operation of defrosting the rear net can be timely executed when the frosting of the outdoor rear net is determined, and the problem of frosting of the rear net is effectively solved.
Illustratively, after the air conditioner starts a heating mode to operate, the controller detects whether a defrosting temperature condition is met, once the defrosting temperature condition is met, the operated time t ' of the compressor in the current operation period is recorded immediately, the operated time t ' is used as an important condition for judging whether the outdoor rear net of the air conditioner frosts, when the operated time t ' of the compressor in each operation period meets the rear net frosting condition, the accumulated times are added by 1, and when the accumulated times reach N, the controller defrosts the outdoor rear net in the subsequent defrosting process of the air conditioner. If taking N as an example, in 2 consecutive operation cycles, if the operation duration of the compressor of each operation cycle meets the back-net frosting condition, it indicates that the outdoor back-net frosts, and the frosting amount of the outdoor back-net causes the intake air volume of the air conditioner to become less, which affects the heat exchange efficiency of the outdoor heat exchanger, so that the controller considers that the defrosting action for the outdoor back-net needs to be performed when the air conditioner is defrosted, so as to avoid the vicious cycle of the back-net frosting state; and if the running time of the compressor in the current running period does not meet the condition, clearing the recorded times.
And step S3, controlling the air conditioner to enter a first defrosting mode, wherein the first defrosting mode comprises a basic defrosting phase and a back net defrosting phase.
Specifically, in the existing defrosting mode, the air conditioner can be controlled to enter the defrosting mode when the defrosting temperature condition is met and the current running time of the compressor reaches the preset running time, and the frosting condition of the outdoor rear net is not considered, however, the influence of the rear net frosting on the air conditioner is considered in the application, the judgment process of the frosting condition of the outdoor rear net is added in the process that the air conditioner meets the defrosting temperature condition and the current running time of the compressor does not reach the preset running time, namely, in the process, the controller can judge whether the outdoor rear net is frosted or not through the running time of the compressor when the defrosting temperature condition is reached in the running period, the compressor is always in the running state, the controller records the current running time of the compressor in real time, and further, the controller determines that the running time of the compressor in N continuous running periods all meets the rear net frosting condition, the air conditioner is controlled to enter a first defrosting mode, the first defrosting mode comprises a basic defrosting stage and a back net defrosting stage, and therefore in the first defrosting mode, defrosting of the outdoor heat exchanger and the radiating fins can be completed in the basic defrosting stage, and frost on the outdoor back net can be effectively removed in the back net defrosting stage, so that vicious circle of frost on the outdoor back net is avoided, the heat exchange effect of the outdoor unit is improved, and the comfort experience of users is improved.
According to the defrosting control method of the air conditioner, when the air conditioner is in a heating mode, the frosting condition of the outdoor rear net is judged according to the running time length of the compressor when the defrosting temperature condition is met in the running period, and when the running time length of the compressor in N running periods is determined to meet the frosting condition of the rear net, the frosting quantity of the outdoor rear net can be determined to seriously influence the heating effect of the air conditioner, so that the air conditioner is controlled to enter the first defrosting mode, the outdoor heat exchanger, the radiating fins and the outdoor rear net are all defrosted, the frosting on the outdoor rear net is effectively removed, the vicious circle 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 the first defrost mode, as shown in fig. 7, and the method includes at least steps S4-S6.
And step S4, entering a basic defrosting stage, controlling the air conditioner to operate in a refrigeration mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating until the air conditioner meets basic defrosting ending conditions.
And step S5, entering a back net defrosting stage, controlling the outdoor fan to reversely run so as to blow heat generated when the refrigerant in the outdoor heat exchanger is condensed to the outdoor back net to melt frost formed on the outdoor back net.
In the embodiment, as the energy efficiency grade is improved year by year, the outdoor fan of the air conditioner adopts the brushless direct current motor, the speed regulation performance of the motor is excellent, and the forward and reverse rotation can be easily realized on the basis of not increasing the cost, thereby providing a basis for realizing the invention.
And step 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, and controlling the air conditioner to exit the first defrosting mode and enter the next operation period.
For example, the controller determines that the reverse operation time t2 of the outdoor fan is greater than or equal to the preset operation time t _ s2, that is, t2 is greater than or equal to t _ s2, it indicates that frost formed on the outdoor rear net is eliminated, controls the operation time of the compressor to be zero cleared, completes the rear net defrosting stage, and enters the next operation period, so far, frost on the outdoor heat exchanger 22 and the outdoor rear net 24 of the air conditioner is completely eliminated, controls the air conditioner to exit the first defrosting mode, and returns to the normal heating mode.
In some embodiments, the back-net frosting condition is: the first set time length is less than or equal to the operated time length of the compressor and less than or equal to a second set time length, wherein the second set time length is less than the preset operation time length.
For example, the controller determines whether the outdoor rear net is frosted or not according to the running time length of the compressor, and if the running time length of the compressor is greater than or equal to a first set time length and the running time length of the compressor is less than or equal to a second set time length, namely the running time length of the compressor is within a range of [ t _ s0, t _ s1], the frosting condition on the outdoor rear net is indicated.
In some embodiments, it may be determined that the air conditioner satisfies the defrosting temperature condition for entering the defrosting mode by obtaining the outdoor coil temperature T _ p and the outdoor environment temperature T _ e, and calculating a temperature difference value Δ T between the outdoor coil temperature T _ p and the outdoor environment temperature T _ e, as can be expressed as Δ T ═ T _ e-T _ p, if the outdoor coil temperature T _ p reaches a first preset lower temperature limit value, i.e., T _ p ≦ T _ s1, and the temperature difference value Δ T between the outdoor coil temperature and the outdoor environment temperature reaches a preset upper temperature difference value, i.e., Δ T ≧ T _ s. And when the two temperature conditions are met, the running time of the compressor is shorter than the prediction time, and if N running periods meet the back net frosting condition continuously, the air inlet of the air conditioner is judged to be influenced, namely, the outdoor back net frosting is judged.
And in the basic defrosting stage, when the temperature T _ p of the outdoor coil reaches the second preset temperature upper limit value, namely T _ p is larger than or equal to the second preset temperature T _ s2, the condition that frost on the condenser and the radiating fins of the outdoor unit is removed is indicated, and the basic defrosting stage can be determined to be finished.
In some embodiments, if it is determined that the operating time lengths of the compressors in the non-consecutive N operating periods all satisfy the rear-screen frosting condition, it is indicated that the outdoor rear screen is not frosted or the frosting degree of the outdoor rear screen does not affect the heat exchange rate of the outdoor heat exchanger, defrosting of the outdoor rear screen is not required, and the air conditioner is controlled to enter the second defrosting mode after it is determined that the current operating time length of the compressors reaches the preset operating time length.
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, and controls the outdoor fan to stop operating.
The following describes an exemplary method for controlling defrosting of an air conditioner according to an embodiment of the present invention with reference to fig. 8, and the following details are provided.
In step S7, the air conditioner operates in a heating mode.
Step S8, the cumulative compressor operation time period is started.
In step S9, it is determined whether the running time of the compressor is greater than or equal to t _ S0, if yes, step S10 is performed, otherwise, step S9 is continuously performed.
In step S10, the defrosting temperature condition for executing the defrosting mode is detected, that is, it is determined whether the outdoor coil temperature is less than or equal to the first preset temperature T _ S1 and whether the temperature difference Δ T between the outdoor coil temperature and the outdoor environment temperature is greater than or equal to the preset temperature difference Δ T _ S. If the defrosting temperature condition is satisfied, go to step S11, otherwise go to step S8.
And step S11, recording the running time length of the current compressor.
Step S12, judging whether the running time length of the compressor meets the back net frosting condition, namely whether the running time length t 'of the compressor meets t _ S0 and t' andt _ S1, if yes, executing step S14, otherwise, executing step S13.
In step S13, the recorded cumulative count n is cleared, and step S15 is executed.
In step S14, 1 is added to the cumulative count n.
In step S15, it is determined whether the accumulated number of times N is greater than N, if so, step S16 is performed, otherwise, step S17 is performed.
In step S16, the outdoor rear net needs to be defrosted, and step S19 is executed.
In step S17, the outdoor rear net defrosting is not required, and step S18 is executed.
In step S18, it is determined whether the current operation time t of the compressor is longer than the preset operation time t _ S, if yes, step S19 is executed, otherwise step S8 is executed.
And 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.
In step S20, it is determined whether the outdoor coil temperature T _ p is greater than or equal to the second predetermined temperature T _ S2, if yes, step S21 is performed, otherwise step S19 is performed.
Step S21, determining whether to perform outdoor rear net defrosting, if yes, performing step S22, otherwise performing step S24.
And step S22, the controller controls the outdoor fan to run reversely, the rotating speed can be set by the system according to actual requirements, and the recorded accumulated times n are cleared.
In step S23, it is determined whether the reverse operation time t2 of the outdoor fan is greater than or equal to the preset operation time t _ S2, if yes, step S24 is executed, otherwise step S22 is executed.
In step S24, the controller controls the compressor operation period to be cleared.
In step S25, the air conditioner exits the defrost mode and returns to step S8.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

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 rear net;
the refrigerant circulation loop is used 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 running time of the compressor in each running period during the operation of the air conditioner in the heating mode, and record the running time of the current compressor when the defrosting temperature condition is met for the first time;
determining that the running time lengths of the compressors in N continuous running periods meet a back 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 phase and a back net defrosting phase.
2. The air conditioner of claim 1, wherein in 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 refrigeration mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating until the air conditioner meets basic defrosting ending conditions;
entering the back net defrosting stage, and controlling the outdoor fan to reversely operate;
and determining that the reverse operation time of the outdoor fan reaches a preset operation time, controlling the operation time of the compressor to be reset, controlling the air conditioner to exit the first defrosting mode, and entering the next operation period.
3. The air conditioner of claim 2, wherein the rear-net frosting condition is: the first set time is less than or equal to the running time of the compressor and less than or equal to the second set time.
4. The air conditioner according to claim 3,
the defrosting temperature condition is 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 condition is as follows: and the temperature of the outdoor coil reaches a second preset upper temperature limit value.
5. The air conditioner of any one of claims 1-4, wherein the controller is further configured to:
determining that the running time lengths of the compressors in the discontinuous N running periods meet the back net frosting condition;
after the current operation time of the compressor is determined to reach the preset operation time, the air conditioner is controlled to enter a second defrosting mode, wherein in the second defrosting mode, the air conditioner is controlled to operate in a refrigerating mode, the compressor is controlled to operate to defrosting frequency, and the outdoor fan is controlled to stop operating;
and determining that the air conditioner meets a basic defrosting ending condition, controlling the running time of the compressor to be reset, and controlling the air conditioner to exit the second defrosting mode.
6. A defrosting control method of an air conditioner is characterized by comprising the following steps:
in the process of operating a heating mode of an air conditioner, recording the operation time length of a compressor in each operation period, and recording 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 N continuous running periods all meet a rear net frosting condition, wherein N is a positive integer greater than 1;
the method comprises the steps of controlling the air conditioner to enter a first defrosting mode, wherein the first defrosting mode comprises a basic defrosting stage and a rear net defrosting stage.
7. The air conditioner defrosting control method of claim 6, wherein controlling the air conditioner to enter a first defrosting mode comprises:
entering the basic defrosting stage, controlling the air conditioner to operate in a refrigeration mode, controlling the compressor to operate to defrosting frequency, and controlling the outdoor fan to stop operating until the air conditioner meets basic defrosting ending conditions;
entering the back net defrosting stage, and controlling the outdoor fan to reversely operate;
and determining that the reverse operation time of the outdoor fan reaches a preset operation time, controlling the operation time of the compressor to be reset, and controlling the air conditioner to exit the first defrosting mode.
8. The air conditioner defrost control method of claim 7, wherein the rear screen frosting condition is: the first set time is less than or equal to the running time of the compressor and less than or equal to the second set time.
9. The air conditioner defrost control method of claim 8,
the defrosting temperature condition is 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 condition is as follows: and the temperature of the outdoor coil reaches a second preset upper temperature limit value.
10. The air conditioner defrost control method of any one of claims 6-9, wherein the controller is further configured to:
determining that the running time lengths of the compressors in the discontinuous N running periods meet the back net frosting condition;
after the current operation time of the compressor is determined to reach the preset operation time, the air conditioner is controlled to enter a second defrosting mode, wherein in the second defrosting mode, the air conditioner is controlled to operate in a refrigerating mode, the compressor is controlled to operate to defrosting frequency, and the outdoor fan is controlled to stop operating;
and determining that the air conditioner meets a basic defrosting ending condition, controlling the running time of the compressor to be reset, and controlling the air conditioner to exit the second defrosting mode.
CN202210605555.3A 2022-05-30 2022-05-30 Air conditioner and defrosting control method thereof Active CN114909776B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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