CN115289615A - Automatic defrosting control method and system for air conditioner - Google Patents
Automatic defrosting control method and system for air conditioner Download PDFInfo
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- CN115289615A CN115289615A CN202210934530.8A CN202210934530A CN115289615A CN 115289615 A CN115289615 A CN 115289615A CN 202210934530 A CN202210934530 A CN 202210934530A CN 115289615 A CN115289615 A CN 115289615A
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- 238000010257 thawing Methods 0.000 title claims abstract description 241
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000001704 evaporation Methods 0.000 claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 230000008020 evaporation Effects 0.000 claims description 55
- 239000003507 refrigerant Substances 0.000 claims description 32
- 230000005494 condensation Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 description 8
- 238000001816 cooling Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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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
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- 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
- F24F11/62—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
- F24F11/67—Switching between heating and cooling modes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air conditioner defrosting, in particular to an automatic defrosting control method and an automatic defrosting control system for an air conditioner, which aim to solve the problem that the use experience of a user is influenced because the indoor temperature cannot be increased and the defrosting time is unnecessarily prolonged due to improper operation control before defrosting of the existing air conditioner. The defrosting control method of the air conditioner comprises the following steps: judging whether the air conditioner meets a defrosting condition or not in the process of heating operation of the air conditioner; if yes, obtaining the evaporating temperature of the outdoor heat exchanger of the air conditioner, further judging whether to execute the operation control before defrosting based on the evaporating temperature, if yes, executing the operation control before defrosting, otherwise, executing reverse defrosting and defrosting by the vibration defrosting machine without executing the operation control before defrosting. Thereby accurately and appropriately performing pre-defrosting operation control.
Description
Technical Field
The invention relates to the technical field of air conditioner defrosting, in particular to an automatic defrosting control method for an air conditioner.
Background
The air conditioner comprises an air conditioner indoor unit and an air conditioner outdoor unit, when the air conditioner heats the indoor in winter, the air conditioner outdoor unit is used as an evaporator to absorb the outdoor heat, and the air conditioner indoor unit is used as a condenser to release the heat to the indoor. At this time, water vapor in the outdoor air is condensed into water droplets and then frosted when encountering cold on the outdoor heat exchanger of the outdoor unit of the air conditioner, so that the heat exchange capacity between the outdoor heat exchanger and the outdoor air is reduced, and the heating capacity of the air conditioner is further affected, and therefore, the outdoor heat exchanger of the outdoor unit of the air conditioner needs to be defrosted.
The defrosting mode is performed on the premise of interrupting the heating mode, which may cause a decrease in the indoor temperature, thereby affecting user comfort. Therefore, in the related art, the air conditioner is controlled to continue the heating mode until the indoor temperature exceeds the target temperature of the set temperature or more by the pre-defrosting operation control within the preset time before the defrosting operation is started, thereby preventing the indoor temperature from excessively decreasing during the defrosting operation. However, when the outdoor heat exchanger is frosted, the indoor temperature may not be increased even if the operation control before defrosting is performed. In this case, the operation before defrosting becomes useless, and the amount of frost formation of the outdoor heat exchanger further increases, which in turn leads to a longer defrosting operation time. In order to solve the above-described problems, in the related art, it is determined whether or not the rotation speed of the compressor has reached a predetermined value or more before starting the pre-defrosting operation, and when the rotation speed of the compressor has reached the predetermined value or more, the defrosting operation is performed immediately without performing the pre-defrosting operation. Since it is not expected that the indoor temperature can be raised when the rotation speed of the compressor becomes equal to or higher than a predetermined value, by immediately performing the defrosting operation, it is possible to prevent the defrosting time from being unnecessarily long.
However, depending on the amount of frost formation in the outdoor heat exchanger, the temperature in the two rooms may not increase even during operation before defrosting when the number of revolutions of the compressor is less than a predetermined value. That is, if the frost formation amount of the outdoor heat exchanger is excessive during the operation control before defrosting, the heat exchange amount in the outdoor heat exchanger is insufficient, and the indoor temperature cannot be raised to the target temperature even if the rotation speed of the compressor is increased.
Disclosure of Invention
Therefore, an object of the present invention is to provide a defrosting control method for an air conditioner and an air conditioner that can appropriately determine whether or not an operation before defrosting is necessary, so as to overcome the disadvantage that the defrosting time is unnecessarily increased even if the indoor temperature cannot be raised due to improper control of the operation before defrosting.
In order to achieve the purpose, the following technical scheme is adopted in the application:
in a first aspect, the present application provides an automatic defrosting control method for an air conditioner, the method including: the air conditioner comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger and an expansion valve, wherein the expansion valve is arranged between the outdoor heat exchanger and the indoor heat exchanger; a four-way valve for switching a flow direction of the refrigerant discharged from the compressor; an outdoor heat exchange temperature sensor that detects an evaporation temperature of the refrigerant in the refrigerant circuit, and an indoor heat exchange temperature sensor that detects a condensation temperature of the refrigerant in the refrigerant circuit, characterized in that the defrosting control method includes:
the method comprises the following steps that S1, in the heating operation process of the air conditioner, whether the air conditioner meets defrosting conditions or not is judged; if yes, executing step S2, if not, executing step S4;
s2, acquiring the evaporation temperature of an outdoor heat exchanger of the air conditioner, and judging whether to execute pre-defrosting operation control or not based on the evaporation temperature, wherein the pre-defrosting operation control is to increase the rotating speed of a compressor within a preset time before the start of a defrosting mode so as to enable the indoor temperature to be a target temperature higher than the set temperature by a specified temperature; if yes, executing step S3, otherwise, executing step S4;
s3, executing operation control before defrosting;
step S4, the operation control before defrosting is not executed, and a defrosting mode is executed, wherein the defrosting mode refers to that the air conditioner is controlled to be switched from a heating mode to a refrigerating mode so as to carry out reverse defrosting;
and step S5, continuing to execute the heating mode.
In a preferred embodiment of the defrosting control method for an air conditioner, the performing of the defrosting mode without performing the pre-defrosting operation control further includes providing a vibration defrosting machine on the outdoor heat exchanger, and controlling the vibration defrosting machine to generate a vibration wave for vibrating down a frost layer on the heat exchanger while performing the defrosting mode.
In a preferred embodiment of the defrosting control method of an air conditioner, the determining whether to perform the pre-defrosting operation control based on the evaporation temperature includes: when the evaporation temperature of the refrigerant is lower than a first preset temperature, the controller judges that the operation control before defrosting is not needed; or acquiring a first evaporation temperature and a second evaporation temperature at intervals within preset time, calculating a difference value between the second evaporation temperature and the first evaporation temperature, and if the difference value is smaller than a first specified value, judging that the operation control before defrosting is not needed by the controller.
In a preferred embodiment of the defrosting control method of an air conditioner, the determining whether to perform the pre-defrosting operation control based on the evaporation temperature includes: and when the evaporation temperature of the refrigerant is higher than a first preset temperature, the controller judges that the operation control before defrosting is required.
In a preferred embodiment of the defrosting control method of the air conditioner, after step S3 is executed, it is determined whether a condition for continuing the pre-defrosting operation control is satisfied, and if so, it is determined that the pre-defrosting operation control needs to be continued; if not, if it is determined that the pre-defrosting operation control does not need to be continued, the pre-defrosting operation control is terminated and the defrosting mode is executed.
In a preferred embodiment of the defrosting control method for an air conditioner, the determining of the operation continuation condition before defrosting is: and determining that the pre-defrosting operation control does not need to be continued when an increase in the condensing temperature of the refrigerant during execution of the pre-defrosting operation control is smaller than a second predetermined value.
In a preferred embodiment of the defrosting control method for an air conditioner, the determining of the operation continuation condition before defrosting is: the controller determines that the pre-defrosting operation does not need to be continued when the evaporation temperature of the refrigerant during execution of the pre-defrosting operation control is lower than a predetermined temperature.
In the preferable technical scheme of the defrosting control method of the air conditioner, the method further comprises the steps of determining the running time of the defrosting mode of the air conditioner, and controlling the outdoor fan to reversely rotate when the running time of the defrosting mode meets the first preset defrosting time.
In a preferred technical scheme of the defrosting control method of the air conditioner, the method further comprises the step of stopping the vibration defrosting machine when the reverse rotation time of the outdoor unit fan reaches a second preset defrosting time, and automatically controlling the air conditioner to enter a normal heating mode.
The invention also provides an automatic defrosting control system of the air conditioner, which comprises a memory, a processor and an automatic defrosting control program of the air conditioner, wherein the automatic defrosting control program of the air conditioner is stored in the memory and can run on the processor, and when the automatic defrosting control program of the air conditioner is executed by the processor, the steps of the automatic defrosting control method of the air conditioner in any one of the steps 1 to 6 are realized.
This application adopts above technical scheme, possesses following beneficial effect at least:
the application provides a defrosting control method of an air conditioner and the air conditioner, wherein in the heating operation process of the air conditioner, whether the air conditioner meets a defrosting condition is judged; if yes, executing step S2, and if not, executing step S4; s2, acquiring the evaporation temperature of an outdoor heat exchanger of the air conditioner, and judging whether to execute pre-defrosting operation control or not based on the evaporation temperature, wherein the pre-defrosting operation control refers to that the rotating speed of a compressor is increased within a preset time before the start of a defrosting mode so that the indoor temperature becomes a target temperature higher than a set temperature by a specified temperature; if yes, executing step S3, otherwise, executing step S4; s3, executing operation control before defrosting; step S4, the operation control before defrosting is not executed, and a defrosting mode is executed, wherein the defrosting mode refers to that the air conditioner is controlled to be switched from a heating mode to a refrigerating mode so as to carry out reverse defrosting; and step S5, continuing to execute the heating mode. By properly judging whether the operation before defrosting is needed or not, the indoor temperature can be increased when the operation before defrosting is needed, the comfort of a user during defrosting is improved, when the operation before defrosting is not needed, the operation before defrosting is prevented from being controlled by mistake, and the technical effect that the defrosting time is unnecessarily prolonged because the indoor temperature cannot be increased is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a refrigerant circuit diagram of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a flow chart of a defrost control method of an air conditioner;
description of reference numerals:
1-compressor, 2-compressor exhaust temperature sensor, 3-four-way valve, 4-outdoor heat exchanger temperature sensor, 5-outdoor temperature sensor, 6-outdoor heat exchanger, 7-outdoor fan, 8-expansion valve, 9-indoor heat exchanger temperature sensor, 10-indoor temperature sensor, 11-indoor heat exchanger, 12-indoor fan.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Fig. 1 is a refrigerant circuit diagram of an air conditioner according to an embodiment of the present invention. The air conditioner comprises a compressor 1, a reversing valve 3, an outdoor heat exchanger 6, an outdoor fan 7, an expansion valve 8, an indoor heat exchanger 11 and an indoor fan 12, wherein an exhaust outlet of the compressor 1 is provided with a compressor exhaust temperature sensor, the outdoor heat exchanger 6 is provided with an outdoor temperature sensor 5 and an outdoor heat exchanger temperature sensor 4, the indoor heat exchanger 11 is provided with an indoor temperature sensor 10 and an indoor heat exchanger temperature sensor 9, the outdoor heat exchanger temperature sensor 4 detects the evaporation temperature of refrigerant in a refrigerant loop, and the indoor heat exchanger temperature sensor 9 detects the condensation temperature of the refrigerant in the refrigerant loop.
Fig. 2 shows an automatic defrosting control method of an air conditioner according to the present invention, which comprises:
step S1, judging whether the air conditioner meets defrosting conditions or not in the process of heating operation of the air conditioner; if yes, executing step S2, and if not, executing step S4;
s2, acquiring the evaporation temperature of an outdoor heat exchanger of the air conditioner, and judging whether to execute pre-defrosting operation control or not based on the evaporation temperature, wherein the pre-defrosting operation control is to increase the rotating speed of a compressor within a preset time before the start of a defrosting mode so as to enable the indoor temperature to be a target temperature higher than the set temperature by a specified temperature; if yes, executing step S3, otherwise, executing step S4;
s3, executing operation control before defrosting;
step S4, the operation control before defrosting is not executed, and a defrosting mode is executed, wherein the defrosting mode is to control the air conditioner to be switched from a heating mode to a cooling mode so as to perform reverse defrosting;
and step S5, continuing to execute the heating mode.
Firstly, in the process of heating operation of the air conditioner, whether the air conditioner meets the defrosting condition is judged. The defrosting start condition is not particularly limited, and for example, it is determined that the defrosting start condition is satisfied when the outdoor temperature is 10 ℃ or lower and the difference between the outdoor temperature and the temperature of the outdoor heat exchanger 6 is 15 ℃ or higher, or the outdoor temperature is 10 ℃ or lower and the temperature of the outdoor heat exchanger 6 is decreased by 2 ℃/5 minutes or more from a reference temperature, which is the temperature of the outdoor heat exchanger 6 after a predetermined time (for example, 5 minutes) has elapsed from the start of the heating operation. When the defrosting start condition is not satisfied, the controller proceeds to step S4 to continue the heating operation, and when the defrosting start condition is satisfied (yes in step S1), the controller proceeds to step S2 to acquire the evaporation temperature of the refrigerant in the outdoor heat exchanger 6, and determines whether or not the defrosting pre-operation start condition is satisfied, wherein the controller increases the rotation speed of the compressor within a preset time before the start of the defrosting mode so that the indoor temperature becomes a target temperature higher than the set temperature by a predetermined temperature. Here, the indoor temperature is a detection value of the indoor temperature sensor 10. The set temperature is a temperature set by a user at the start of the heating operation. The target temperature refers to an indoor temperature to be achieved by the operation before defrosting. The target temperature is not particularly limited, and may be a temperature higher than the set temperature. The predetermined temperature is, for example, 1 ℃ to 2 ℃.
The controller determines that the pre-defrosting operation control is necessary when the pre-defrosting operation start condition is satisfied, and determines that the pre-defrosting operation control is not necessary when the pre-defrosting operation start condition is not satisfied. Preferably, the controller determines that the pre-defrosting operation condition is satisfied (yes in step S2), performs the pre-defrosting operation in step S3, determines that the pre-defrosting operation condition is not satisfied (no in step S2), and performs the defrosting mode in which the air conditioner is controlled to switch from the heating mode to the cooling mode to perform the reverse defrosting without performing the pre-defrosting operation control in step S4, when the evaporation temperature is, for example, equal to or higher than-20 ℃.
Further, the executing of the defrosting mode without executing the pre-defrosting operation control further includes that a vibration defrosting machine is further provided on the outdoor heat exchanger, and the vibration defrosting machine is further controlled to generate a vibration wave while the defrosting mode is executed, wherein the vibration wave is used for vibrating down a frost layer on the heat exchanger. The vibration defroster may convert other forms of energy into mechanical energy in a vibration form, and transmits the mechanical energy to the heat exchanger to vibrate a frost layer on the heat exchanger, and the vibration defroster may be an ultrasonic transducer, a pneumatic vibrator, or the like, without limitation.
In some embodiments, the vibration defrosting machine is controlled to generate vibration waves, a plurality of vibration defrosting machines may be disposed on the surface of the heat exchanger, and the vibration defrosting machines generate vibration waves, or a sound wave generating device may be used to vibrate the frost layer on the heat exchanger in an air-isolated manner by sound waves, which is not limited in this respect.
It can be understood that the vibration wave generated by the vibration defroster can destroy the structure of the frost layer, and can remove a part of the frost layer while carrying out reverse defrosting, thereby reducing the processing difficulty of the residual frost layer and improving the defrosting work efficiency.
Preferably, the determining whether to execute the pre-defrosting operation control based on the evaporation temperature includes: when the evaporation temperature of the refrigerant is lower than a first preset temperature, the controller judges that the operation control before defrosting is not needed; or acquiring a first evaporation temperature and a second evaporation temperature at intervals within a preset time, calculating a difference value between the second evaporation temperature and the first evaporation temperature, and if the difference value is smaller than a first specified value, judging that the operation control before defrosting is not needed by the controller;
preferably, the determining whether to execute the pre-defrosting operation control based on the evaporation temperature includes: and when the evaporation temperature of the refrigerant is higher than a first preset temperature, the controller judges that the operation control before defrosting is needed.
When the evaporation temperature is lower than a first preset temperature (for example, -20 ℃), the controller determines that the pre-defrosting operation start condition is not satisfied (no in step S2), and executes the defrosting mode without executing the pre-defrosting operation control (step S4). In this way, when the evaporation temperature is lower than the first preset temperature, it is determined that the pre-defrosting operation control is not required to be started, and the defrosting operation is performed quickly. This is because, when the evaporation temperature is lower than the first preset temperature, the amount of frost formation of the outdoor heat exchanger 23 is large, and even if the operation before defrosting is performed, the increase in the indoor temperature cannot be expected. Since the frost formation amount of the outdoor heat exchanger 23 is estimated based on the evaporation temperature and whether or not the pre-defrosting operation control needs to be started is determined based on the estimation result, it is possible to appropriately determine whether or not the pre-defrosting operation is needed, as compared with a case where the rotation speed of the compressor 21 is equal to or greater than a predetermined value.
The reference whether or not the operation control before defrosting needs to be started is not limited to whether or not the evaporation temperature is equal to or higher than the first preset temperature. For example, when the decrease amount of the evaporation temperature is equal to or greater than a predetermined value (for example, 1 ℃/minute), it may be determined that the pre-defrosting operation control is not required to be started. In this case, the controller may determine that the pre-defrosting operation control is not necessary when a difference between the first evaporation temperature and the second evaporation temperature is obtained at predetermined time intervals, the difference between the second evaporation temperature and the first evaporation temperature, that is, a decrease amount of the evaporation temperature is calculated, and the decrease amount of the evaporation temperature is smaller than a first predetermined value (for example, 5 ℃. The amount of decrease in the evaporation temperature means the rate of frost formation in the outdoor heat exchanger 6, and therefore the degree and state of frost formation can be easily grasped.
Preferably, after step S3 is executed, it is also determined whether a condition for continuing the pre-defrosting operation control is satisfied, and if so, it is determined that the pre-defrosting operation control needs to be continued; if not, if it is determined that the pre-defrosting operation control does not need to be continued, the pre-defrosting operation control is terminated and the defrosting mode is executed.
The controller determines whether or not a condition for continuing the pre-defrosting operation is satisfied after the pre-defrosting operation control is executed in step S3. The process of determining the pre-defrosting operation continuation condition corresponds to determining whether or not the pre-defrosting operation control needs to be continued during execution of the pre-defrosting operation control. The controller determines that the pre-defrosting operation control needs to be continued when the pre-defrosting operation continuation condition is satisfied, and determines that the pre-defrosting operation control does not need to be continued when the pre-defrosting operation continuation condition is not satisfied.
Preferably, the condition for determining the operation continuation before defrosting is: and determining that the pre-defrosting operation control does not need to be continued when an increase in the condensing temperature of the refrigerant during execution of the pre-defrosting operation control is smaller than a second predetermined value.
Preferably, the operation continuation condition before defrosting is determined as follows: the controller determines that the pre-defrosting operation does not need to be continued when the evaporation temperature of the refrigerant during execution of the pre-defrosting operation control is lower than a predetermined temperature.
As the condition for continuing the pre-defrosting operation, for example, when the increase in the indoor temperature during execution of the pre-defrosting operation control is equal to or less than a predetermined value (e.g., 0.5 ℃/minute), when the increase in the condensing temperature of the refrigerant during execution of the pre-defrosting operation control is equal to or less than a second predetermined value (e.g., 1 ℃/minute), or when the evaporation temperature during execution of the pre-defrosting operation control is less than a first preset temperature (e.g., -20 ℃).
When the increase in the indoor temperature during execution of the pre-defrosting operation control is equal to or less than a predetermined value (e.g., 0.5 ℃/minute), or when the increase in the condensing temperature of the refrigerant during execution of the pre-defrosting operation control is equal to or less than a predetermined value (e.g., 1 ℃/minute), or when the evaporation temperature during execution of the pre-defrosting operation control is less than a first preset temperature (e.g., -20 ℃), the frost formation amount of the outdoor heat exchanger 6 is large, and the heat exchange amount between the refrigerant in the outdoor heat exchanger 6 and the outdoor air is reduced. In this case, since it is expected that the pre-defrosting operation control cannot raise the indoor temperature, the controller ends the pre-defrosting operation control to execute the defrosting mode.
The controller determines whether or not a defrosting operation end condition is satisfied after the defrosting operation is started. The defrosting operation termination condition is, for example, a time (for example, 10 minutes) elapsed from the start of the defrosting operation, or a time when the temperature of the outdoor heat exchanger 6 becomes equal to or higher than a predetermined temperature (for example, 10 ℃). The controller continues the defrosting operation when the defrosting operation ending condition is not satisfied, and ends the defrosting operation when the defrosting operation ending condition is satisfied.
Preferably, the method further comprises exiting the defrosting mode and stopping the vibration defrosting machine according to preset exit conditions, wherein the preset exit conditions are as follows: the working time of the defrosting mode of the air conditioner reaches the set time.
Preferably, the method further comprises the steps of determining the running time of the air conditioner in the defrosting mode, and controlling the outdoor fan to reversely rotate when the running time of the defrosting mode meets a first preset defrosting time.
Preferably, the method further comprises the step of stopping the vibration defrosting machine when the reverse rotation time of the outdoor unit fan reaches a second preset defrosting time, and automatically controlling the air conditioner to enter a normal heating mode.
The control of the outdoor fan for reversing can be understood as that the outdoor fan is in a state from a closed state to a reverse running state. When the running time of the defrosting mode satisfies the first preset defrosting time, the outdoor fan is controlled to rotate reversely, wind blown out by the outdoor fan blows to the outdoor heat exchanger 6, so that a frost layer on the surface of the outdoor heat exchanger 6, which is not melted, falls off under the action of the wind blowing, and meanwhile dew on the surface of the outdoor heat exchanger can be dried, and the technical problems of unclean defrosting and incomplete defrosting in the prior art are solved.
The present invention also provides, as a preferred embodiment of the present invention, an automatic air conditioner defrosting control system, which includes a memory, a processor, and an automatic air conditioner defrosting control program stored in the memory and operable on the processor, wherein when the automatic air conditioner defrosting control program is executed by the processor, the steps of the automatic air conditioner defrosting control method according to any one of 1 to 6 are implemented.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.
Claims (10)
1. An automatic defrosting control method for an air conditioner, wherein the air conditioner comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger and an expansion valve, wherein the expansion valve is arranged between the outdoor heat exchanger and the indoor heat exchanger; a four-way valve for switching a flow direction of the refrigerant discharged from the compressor; an outdoor heat exchange temperature sensor that detects an evaporation temperature of the refrigerant in the refrigerant circuit, and an indoor heat exchange temperature sensor that detects a condensation temperature of the refrigerant in the refrigerant circuit, characterized in that the defrosting control method includes:
step S1, judging whether the air conditioner meets defrosting conditions or not in the process of heating operation of the air conditioner; if yes, executing step S2, and if not, executing step S4;
s2, acquiring the evaporation temperature of an outdoor heat exchanger of the air conditioner, and judging whether to execute pre-defrosting operation control or not based on the evaporation temperature, wherein the pre-defrosting operation control is to increase the rotating speed of a compressor within a preset time before the start of a defrosting mode so as to enable the indoor temperature to be a target temperature higher than the set temperature by a specified temperature; if yes, executing step S3, otherwise, executing step S4;
s3, executing operation control before defrosting;
step S4, the operation control before defrosting is not executed, and a defrosting mode is executed, wherein the defrosting mode refers to that the air conditioner is controlled to be switched from a heating mode to a refrigerating mode so as to carry out reverse defrosting;
and step S5, continuing to execute the heating mode.
2. The defrost control method of claim 1, wherein the performing of the defrost mode without performing the pre-defrost operation control further comprises further comprising providing a vibration defroster on the outdoor heat exchanger, and controlling the vibration defroster to generate a vibration wave for vibrating down a frost layer on the outdoor heat exchanger while the defrost mode is performed.
3. The defrost control method of claim 1, wherein said determining whether to perform pre-defrost operation control based on the evaporation temperature comprises:
when the evaporation temperature of the refrigerant is lower than a first preset temperature, the controller judges that the pre-defrosting operation control is not needed;
or acquiring a first evaporation temperature and a second evaporation temperature at intervals within preset time, calculating a difference value between the second evaporation temperature and the first evaporation temperature, and if the difference value is smaller than a first specified value, judging that the operation control before defrosting is not needed by the controller.
4. The defrost control method of claim 1, wherein said determining whether to perform pre-defrost operation control based on the evaporation temperature comprises:
and when the evaporation temperature of the refrigerant is higher than a first preset temperature, the controller judges that the operation control before defrosting is needed.
5. The defrosting control method according to any one of claims 1 to 4, wherein after the step S3 is executed, it is further determined whether or not a continuation condition of the pre-defrosting operation control is established, and if so, it is determined that the pre-defrosting operation control needs to be continued; if not, if it is determined that the pre-defrosting operation control does not need to be continued, the pre-defrosting operation control is terminated and the defrosting mode is executed.
6. The defrosting control method according to claim 5, wherein the determination of the pre-defrosting operation continuation condition is: and determining that the pre-defrosting operation control does not need to be continued when an increase in the condensing temperature of the refrigerant during execution of the pre-defrosting operation control is smaller than a second predetermined value.
7. The defrost control method according to claim 5, wherein the determining a pre-defrost operation continuation condition is: the controller determines that the pre-defrosting operation does not need to be continued when the evaporation temperature of the refrigerant during execution of the pre-defrosting operation control is lower than a predetermined temperature.
8. The defrost control method of any one of claims 1-7, further comprising determining a period of time for the air conditioner to operate the defrost mode, and controlling the outdoor fan to reverse when the period of time for the defrost mode satisfies a first preset defrost period.
9. The defrost control method of claim 8, further comprising stopping the vibration defroster when a reverse rotation period of the outdoor unit fan reaches a second preset defrost period, and automatically controlling the air conditioner to enter a normal heating mode.
10. An automatic defrosting control system of an air conditioner, which is characterized by comprising a memory, a processor and an automatic defrosting control program of the air conditioner, wherein the automatic defrosting control program of the air conditioner is stored in the memory and can run on the processor, and when the automatic defrosting control program of the air conditioner is executed by the processor, the steps of the automatic defrosting control method of the air conditioner in any one of 1 to 8 are realized.
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