CN113028591A - Air conditioner frosting delaying method, control device and air conditioner - Google Patents
Air conditioner frosting delaying method, control device and air conditioner Download PDFInfo
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- CN113028591A CN113028591A CN202110159489.7A CN202110159489A CN113028591A CN 113028591 A CN113028591 A CN 113028591A CN 202110159489 A CN202110159489 A CN 202110159489A CN 113028591 A CN113028591 A CN 113028591A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention provides a method for delaying frosting of an air conditioner, a control device and the air conditioner, and relates to the technical field of air conditioners. The method for delaying frosting of the air conditioner comprises the following steps: acquiring the outdoor environment temperature; judging whether the outdoor environment temperature is smaller than a first temperature threshold value or not; if yes, controlling the air conditioner to enter a frosting delaying mode, and under the frosting delaying mode, executing a heating mode by the air conditioner and increasing the rotating speed of the outdoor fan. The embodiment of the invention can delay the frosting degree of the outdoor unit, thereby reducing the times of defrosting operation executed by the air conditioner, correspondingly prolonging the heating duration and the heating effect of the indoor unit on the indoor environment, and improving the use comfort of users.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method for delaying frosting of an air conditioner, a control device and the air conditioner.
Background
The air conditioner wide application is in the regulation of indoor temperature, when indoor temperature is lower, can choose for use the mode of heating of air conditioner, heats the in-process, when outdoor ambient temperature is lower, the frosting phenomenon appears easily in the outer quick-witted heat exchanger of air conditioner to along with the extension of operating time, the frost layer on the outer quick-witted heat exchanger of machine can be long-pending thicker more, leads to the heat exchange efficiency greatly reduced of outer quick-witted heat exchanger, and the heating volume of the air conditioner inner machine heat exchanger also reduces thereupon.
In the prior art, generally, an air conditioner is directly controlled to be switched from a heating mode to a cooling mode, an outer machine heat exchanger radiates heat outwards to remove a frost layer on the outer machine heat exchanger, after defrosting is completed, the air conditioner is switched from the cooling mode to the heating mode, and after the air conditioner runs for a long time, air outlet of an indoor machine can meet user requirements, so that frequent defrosting of the air conditioner is caused, and the use comfort of a user is poor.
Disclosure of Invention
The invention aims to provide a method for delaying frosting of an air conditioner, a control device and the air conditioner, and aims to solve the technical problems that the conventional air conditioner is frequently defrosted and the use comfort of a user is poor.
In order to solve the above problems, the present invention provides a method for delaying frosting of an air conditioner, comprising:
acquiring the outdoor environment temperature; judging whether the outdoor environment temperature is smaller than a first temperature threshold value; and if so, controlling the air conditioner to enter a frosting delaying mode, wherein in the frosting delaying mode, the air conditioner executes a heating mode, and the rotating speed of the outdoor fan is increased.
According to the method for delaying frosting of the air conditioner, the frosting degree of the outdoor unit can be judged according to the comparison between the outdoor environment temperature and the first temperature threshold, when the outdoor environment is severe, the air conditioner is controlled to enter a frosting delaying mode, and under the frosting delaying mode, the air conditioner still executes a heating mode so as to keep the indoor unit to continuously perform heating operation on the indoor environment and correspondingly maintain the use comfort of a user; meanwhile, the rotating speed of the outdoor fan is increased, so that the heat absorption effect of the outdoor unit on the outdoor environment is enhanced, the pressure of the working medium at the outdoor unit is increased, and the reduction of the temperature of the working medium at the outdoor unit is slowed down, so that the effect of delaying frosting of the outdoor unit is achieved, the defrosting times of the air conditioner are correspondingly reduced, the outdoor unit is defrosted by the air conditioner in a frequent refrigeration mode, the indoor unit stops heating the indoor environment and even refrigerates the indoor environment, and the use experience condition of a user is influenced; in addition, the heat exchange efficiency of the outdoor unit is improved, and the heating effect of the indoor unit on the indoor environment is correspondingly enhanced, so that the heating effect of the air conditioner on the indoor environment is improved, long-time continuous effective heating of the air conditioner on the indoor environment is ensured, and the use comfort of a user is correspondingly improved.
Optionally, if so, controlling the air conditioner to enter a frosting delay mode, where in the frosting delay mode, the air conditioner executes a heating mode, and the step of increasing the rotation speed of the outdoor fan includes: acquiring the system low-pressure of the air conditioner, the working medium inlet pipe temperature of an outdoor unit and the actual rotating speed of an outdoor fan; judging whether the low-pressure of the system and the working medium inlet pipe temperature meet the condition of delaying frosting or not; and if the actual rotating speed is less than the preset upper limit rotating speed, controlling to increase the rotating speed of the outdoor fan. The low-pressure of the comprehensive system and the working medium inlet pipe temperature jointly judge whether the air conditioner meets the condition of delaying frosting, so that the state monitoring accuracy of the air conditioner can be effectively improved, and the effective delaying of the frosting of the air conditioner is correspondingly ensured.
Optionally, the step of determining whether the low pressure of the system and the temperature of the working medium inlet pipe meet the condition of delaying frosting includes: judging whether the low-pressure of the system is smaller than a pressure limit value or not; and if so, determining that the frost delaying condition is met.
Optionally, the step of determining whether the low pressure of the system and the temperature of the working medium inlet pipe meet the condition of delaying frosting includes: judging whether the working medium inlet pipe temperature is smaller than a second temperature threshold value or not, wherein the duration time of the working medium inlet pipe temperature being smaller than the second temperature threshold value is greater than or equal to a preset time; and if so, determining that the frost delaying condition is met.
Optionally, if the actual rotating speed is less than the preset upper limit rotating speed, the step of controlling to increase the rotating speed of the outdoor fan includes: and determining a second rotating speed threshold value for increasing the rotating speed of the outdoor fan at this time according to the first rotating speed threshold value for increasing the rotating speed of the outdoor fan at the last time, wherein the second rotating speed threshold value is greater than the first rotating speed threshold value.
Optionally, the method further comprises: after the air conditioner enters the frosting delaying mode, judging whether the actual rotating speed is greater than or equal to the preset upper limit rotating speed or not; and if so, controlling the air conditioner to exit the frosting delaying mode and enter a conventional defrosting mode. In the same mode of delaying defrosting, when the rotating speed of the outdoor fan is increased and adjusted, the rotating speed value of the rotating speed increase of the outdoor fan at this time is larger than the rotating speed value of the rotating speed increase of the outdoor fan at last time, namely, the adjusting degree of the rotating speed of the outdoor fan on heat exchange and frosting alleviation of the outdoor unit is enhanced, the rotating speed of the outdoor fan is adjusted in a gradient mode, so that the outdoor fan can gradually and efficiently achieve the effect of alleviating frosting of the outdoor unit, and the effectiveness and the adjusting efficiency of the treatment of alleviating frosting of the outdoor unit are correspondingly improved.
Optionally, if so, the step of controlling the air conditioner to exit the frost-formation-delaying mode and enter the normal defrosting mode includes: and controlling the outdoor fan to operate at the actual rotating speed when the outdoor fan exits the frosting delaying mode until the air conditioner completes one-time defrosting in the conventional defrosting mode. In the conventional defrosting mode, the outdoor fan keeps a higher rotating speed, and the heat exchange between the outdoor unit and an external frost layer of the outdoor unit can be effectively improved, so that the defrosting efficiency of the outdoor unit is improved, the defrosting time of the air conditioner is correspondingly shortened, the adverse effect of the defrosting process of the air conditioner on the heating of the indoor environment is reduced, and the use comfort of a user is further ensured.
Optionally, the air conditioner is a multi-split air conditioner, in the heating mode, working media flow into the outdoor unit from the indoor units through the branch lines, and the lowest one of the branch line working media flowing into the outdoor unit is determined to be the working media inlet pipe temperature of the outdoor unit. The lowest working medium temperature in the branch pipes is used as the working medium inlet pipe temperature of the outdoor unit, the rotating speed of the outdoor fan is adjusted according to the working medium inlet pipe temperature, the adjusting effect is superior to the rotating speed adjustment according to the actual working medium inlet pipe temperature of the outdoor unit, the frosting delaying effect of the rotating speed adjustment of the outdoor fan in the multi-split air conditioner on the outdoor unit is improved, a plurality of outdoor units in the multi-split air conditioner heating process are ensured, particularly the indoor unit with the lowest working medium temperature can have a good heating effect on the indoor environment, the defrosting times of the multi-split air conditioner are reduced, and the use comfort of a user is improved.
The present invention also provides a control apparatus comprising: the detection module is used for detecting the outdoor environment temperature; the judging module is used for judging whether the outdoor environment temperature is smaller than a first temperature threshold value or not; and the control module is used for controlling the air conditioner to enter a frost delaying mode according to the judgment result. The control device can execute the frost delaying method, can delay the frost degree of the outdoor unit, thereby reducing the times of defrosting operation executed by the air conditioner, correspondingly prolonging the heating duration and the heating effect of the indoor unit on the indoor environment, and improving the use comfort of users.
The invention also provides an air conditioner, which comprises a computer readable storage medium and a controller, wherein the computer readable storage medium is used for storing a computer program, and the computer program is read by the controller and runs to realize the air conditioner frost delaying method. The computer readable storage medium of the air conditioner stores the related computer program of the method for delaying frosting, and the controller can control the rotating speed of the outdoor fan and the operation mode of the air conditioner through the computer program, so that the frequency of defrosting operation executed by the air conditioner is reduced, the heating duration and the heating effect of the indoor unit on the indoor environment are correspondingly prolonged, and the use comfort of a user is improved.
The invention also provides a computer readable storage medium, which stores a computer program, and when the computer program is read and executed by a controller, the method for delaying frosting of the air conditioner is realized. The computer readable storage medium includes all technical effects of the above-mentioned frost-delaying method, which are not described herein in detail.
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, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic flow chart of a first method for retarding frost formation according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a second method for retarding frost formation according to an embodiment of the present invention;
FIG. 3 is a partial flow diagram of a third method for retarding frost formation according to an embodiment of the present invention;
FIG. 4 is a partial flow diagram illustrating a fourth method for retarding frost formation, in accordance with one embodiment of the present invention;
fig. 5 is a schematic structural diagram of a control device according to an embodiment of the present invention.
Description of reference numerals:
51-a detection module; 52-a judgment module; 53-control module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
FIG. 1 is a schematic flow chart of a first method for delaying frosting according to an embodiment of the present invention.
As shown in fig. 1, the frost-retarding method includes:
s102 acquires an outdoor ambient temperature.
S104, judging whether the outdoor environment temperature is smaller than a first temperature threshold value.
And S106, if so, controlling the air conditioner to enter a frosting delaying mode, and under the frosting delaying mode, executing a heating mode by the air conditioner and increasing the rotating speed of the outdoor fan.
When the air conditioner is started and the heating mode is executed, the frosting degree of the outdoor unit is determined according to the outdoor environment temperature, the outdoor environment temperature is compared with the first temperature threshold, when the outdoor environment temperature is larger than or equal to the first temperature threshold, the current outdoor environment temperature is represented to be not in a low-temperature range where the outdoor unit is prone to frosting, and the outdoor unit is not prone to frosting when the outdoor environment temperature runs at the outdoor environment temperature, so that the air conditioner can run according to a conventional defrosting mode. When the outdoor environment temperature is lower than a first temperature threshold, representing that the current outdoor environment temperature enters a low-temperature range in which an outdoor unit is prone to frosting, and the frosting degree of the outdoor unit is severe when the outdoor unit operates at the outdoor environment temperature, controlling the air conditioner to enter a frosting delaying mode at the moment, and controlling the air conditioner to still execute a heating mode under the frosting delaying mode so as to keep the indoor unit to continuously perform heating operation on the indoor environment and correspondingly maintain the use comfort of a user; meanwhile, the rotating speed of the outdoor fan is increased, so that the heat absorption effect of the outdoor unit on the outdoor environment is enhanced, the pressure of the working medium at the outdoor unit is increased, and the reduction of the temperature of the working medium at the outdoor unit is slowed down, so that the effect of delaying frosting of the outdoor unit is achieved, the defrosting times of the air conditioner are correspondingly reduced, the outdoor unit is defrosted by the air conditioner in a frequent refrigeration mode, the indoor unit stops heating the indoor environment and even refrigerates the indoor environment, and the use experience condition of a user is influenced; in addition, the heat exchange efficiency of the outdoor unit is improved, and the heating effect of the indoor unit on the indoor environment is correspondingly enhanced, so that the heating effect of the air conditioner on the indoor environment is improved, long-time continuous effective heating of the air conditioner on the indoor environment is ensured, and the use comfort of a user is correspondingly improved.
In particular, the first temperature threshold may range from 0 ℃ to 4 ℃, preferably 2 ℃.
Optionally, in this embodiment, in step S106: if yes, the air conditioner is controlled to enter a frosting delaying mode, the air conditioner executes a heating mode under the frosting delaying mode, and the step of increasing the rotating speed of the outdoor fan comprises the following steps: acquiring the system low-pressure of the air conditioner, the working medium inlet pipe temperature of an outdoor unit and the actual rotating speed of an outdoor fan; judging whether the low-pressure of the system and the temperature of the working medium inlet pipe meet the condition of delaying frosting or not; and if the actual rotating speed is less than the preset upper limit rotating speed, controlling to increase the rotating speed of the outdoor fan.
The system low pressure of the air conditioner refers to the pressure of a working medium after passing through the outdoor unit and before entering the compressor, the saturation temperature corresponding to the system low pressure is the evaporation temperature of the working medium in the outdoor unit, the evaporation temperature of the working medium at the outdoor unit is determined by the level of the system low pressure, when the system low pressure is lower, the evaporation temperature of the working medium is correspondingly lower, the heat exchange effect of the outdoor unit and the outdoor environment is worsened along with the lower pressure, and the outdoor unit is easier to frost; when the low pressure of the system is higher, the evaporation temperature of the working medium is correspondingly higher, the heat exchange effect between the outdoor unit and the outdoor environment is improved, and the frosting degree of the outdoor unit can be relieved. The working medium inlet pipe temperature of the outdoor unit is the working medium temperature in a pipeline of the working medium flowing from the indoor unit to the outdoor unit in a heating mode, the working medium inlet pipe temperature determines the working medium temperature flowing through the outdoor unit, and when the working medium inlet pipe temperature is low, the outdoor unit frosts quickly and seriously; when the temperature of the working medium inlet pipe is higher, the frosting speed of the outdoor unit is slowed down, and the frosting degree is relieved; preferably, the lowest working medium temperature in a pipeline through which the working medium flows from the indoor unit to the outdoor unit can be selected as the working medium inlet pipe temperature of the outdoor unit, so as to represent the worst frosting degree of the outdoor unit. The actual rotating speed of the outdoor fan during operation can affect the heat exchange effect between the outdoor unit and the outdoor environment, the preset upper limit rotating speed of the outdoor fan during normal operation is determined according to parameters such as the model number and the operating environment of the outdoor fan, when the actual rotating speed of the outdoor fan is lower than the preset upper limit rotating speed, the outdoor fan can normally operate, the higher the rotating speed of the outdoor fan is, the better the heat exchange effect between the outdoor unit and the outdoor environment is, the higher the pressure and the temperature of working media at the outdoor unit can be improved, and therefore the frosting degree at the outdoor unit is relieved.
Therefore, the frosting tendency of the outdoor unit can be judged according to the system low-pressure of the air conditioner and the working medium inlet pipe temperature of the outdoor unit, when the outdoor unit is judged to be not frosted easily or frosted easily but frosted slightly, the air conditioner is determined not to meet the condition of delaying frosting, and the air conditioner is correspondingly controlled to execute a conventional defrosting mode; when the frosting trend of the outdoor unit tends to be frosted and the frosting degree is relatively serious, the air conditioner is determined to meet the condition of delaying frosting, and when the actual rotating speed of the outdoor fan is in the normal rotating speed range, the operation of delaying frosting is executed: controlling and increasing the rotating speed of the outdoor fan; when the actual rotating speed of the outdoor fan reaches the preset upper limit rotating speed, further increasing the rotating speed of the outdoor fan influences the normal operation of the outdoor fan, and is not suitable for delaying frosting by increasing the rotating speed of the outdoor fan again, the air conditioner is controlled to enter a conventional defrosting mode until the air conditioner completes primary defrosting on the outdoor unit, the air conditioner executes an initial heating mode, the low-pressure of a system of the air conditioner, the working medium inlet pipe temperature of the outdoor unit and the actual rotating speed of the outdoor fan are judged again, and the air conditioner is controlled to enter the conventional defrosting mode or the frosting delaying mode. The comprehensive system low-pressure and the working medium inlet pipe temperature jointly judge whether the air conditioner meets the condition of delaying frosting, so that the state monitoring accuracy of the air conditioner can be effectively improved, and the effective delaying of the frosting of the air conditioner is correspondingly ensured.
Specifically, in this embodiment, the step of determining whether the low-pressure of the system and the temperature of the working medium inlet pipe satisfy the condition of delaying frosting includes: judging whether the low-pressure of the system is smaller than a pressure limit value or not; if yes, determining that the frost delaying condition is met. The judgment method mainly judges according to the low pressure of the system, when the low pressure of the system is smaller than a pressure limit value, the frosting tendency of the outdoor unit tends to frosting and the frosting degree is relatively serious, the air conditioner is determined to meet the frosting delaying condition, and the air conditioner is correspondingly controlled to enter a frosting delaying mode; when the low-pressure of the system is larger than or equal to the pressure limit value, the outdoor unit is not easy to frost or is easy to frost but the frosting degree is slight, the working medium inlet pipe temperature is continuously judged, and whether the air conditioner meets the condition of delaying frosting or not is finally determined.
Besides the judgment of the condition of delaying frosting according to the low-pressure of the system, the step of judging whether the low-pressure of the system and the temperature of the working medium inlet pipe meet the condition of delaying frosting can further comprise the following steps: judging whether the temperature of the working medium entering pipe is less than a second temperature threshold value or not, wherein the duration time when the temperature of the working medium entering pipe is less than the second temperature threshold value is more than or equal to a preset time; if yes, determining that the frost delaying condition is met. The judgment method mainly judges according to the pipe inlet temperature of the working medium, when the pipe inlet temperature of the working medium is smaller than a second temperature threshold value and the duration of the pipe inlet temperature of the working medium which is lower than the second temperature threshold value is greater than or equal to the preset duration, the pipe inlet temperature of the working medium can be stably lower than the second temperature threshold value for a long time, the frosting tendency of an outdoor unit tends to frosting and the frosting degree is severe, the air conditioner is determined to meet the frosting delaying condition, and the air conditioner is correspondingly controlled to enter a frosting delaying mode; when the working medium inlet pipe temperature is lower than the second temperature threshold value, but the duration of the working medium inlet pipe temperature being lower than the second temperature threshold value is shorter than the preset duration, the working medium inlet pipe temperature is in an unstable state, and the outdoor unit is possibly in a transition stage where frosting is difficult and easy, so that the working medium inlet pipe temperature needs to be continuously judged; when the duration time that the temperature of the working medium entering pipe is kept lower than the second temperature is less than the preset duration time, or the temperature of the working medium entering pipe is greater than or equal to the second temperature threshold value, the fact that the outdoor unit is in a transition stage that frosting is difficult to occur is indicated, the outdoor unit is not easy to frost, or frosting is easy to occur but the frosting degree is slight, the low-pressure of the system is continuously judged, and whether the air conditioner meets the condition of delaying frosting or not is finally determined.
Optionally, in this embodiment, if the actual rotation speed is less than the preset upper limit rotation speed, the step of controlling to increase the rotation speed of the outdoor fan includes: and determining a second rotating speed threshold value for increasing the rotating speed of the outdoor fan at this time according to the first rotating speed threshold value for increasing the rotating speed of the outdoor fan last time, wherein the second rotating speed threshold value is greater than the first rotating speed threshold value. When the air conditioner enters a frost delaying mode and meets a frost delaying condition, the actual rotating speed of the outdoor fan is smaller than the preset upper limit rotating speed, and then the frost relieving treatment can be performed on the outdoor unit by increasing the rotating speed of the outdoor fan; controlling and increasing the rotating speed of the outdoor fan, wherein the system low-pressure and the working medium inlet pipe temperature of the air conditioner are increased to a certain extent after the rotating speed of the outdoor fan is increased, whether the system low-pressure and the working medium inlet pipe temperature meet the condition of delaying frosting or not is continuously judged under the state that the outdoor fan is operated at the increased rotating speed, if not, the frosting of the outdoor unit is effectively relieved by increasing the rotating speed of the outdoor fan, and the outdoor fan is continuously operated at the increased rotating speed; if the condition of delaying frosting is still met, the rotating speed value of the rotating speed increase of the outdoor fan is smaller, the effect of relieving frosting of the outdoor unit is not achieved, the rotating speed of the outdoor fan is controlled and increased again, the rotating speed value of the rotating speed increase of the outdoor fan at this time is larger than the rotating speed value of the rotating speed increase of the outdoor fan at last time, namely the adjusting degree of the rotating speed of the outdoor fan on heat exchange and frosting relief of the outdoor unit is enhanced, the effect of relieving frosting of the outdoor unit can be gradually and efficiently achieved by the outdoor fan through gradient adjustment of the rotating speed of the outdoor fan, and effectiveness and adjusting efficiency of treatment of relieving frosting of the outdoor unit are correspondingly improved.
In this embodiment, after the air conditioner enters the frost delaying mode, whether the actual rotating speed is greater than or equal to the preset upper limit rotating speed is judged; and if so, controlling the air conditioner to exit the frost-forming delaying mode and enter a conventional defrosting mode. After the air conditioner enters a frost delaying mode, judging whether the air conditioner meets a frost delaying condition or not by judging the low-pressure and the working medium inlet pipe temperature of the system, and correspondingly increasing the rotating speed of the outdoor fan; after defrosting is finished, the air conditioner returns to the initial heating mode again, and the defrosting delaying method is executed again so as to delay frosting of the outdoor unit, accordingly reduce defrosting times of the air conditioner, ensure heating effect of the air conditioner on outdoor environment and accordingly improve use comfort of users.
Optionally, in this embodiment, when the rotation speed of the outdoor fan reaches the preset upper limit rotation speed, the air conditioner is controlled to exit the frost-formation-delaying mode and enter the conventional defrosting mode, and the outdoor fan is controlled to operate at the actual rotation speed when exiting the frost-formation-delaying mode until the air conditioner completes one defrosting in the conventional defrosting mode. After the air conditioner enters a conventional defrosting mode, the air conditioner judges whether the heating mode is converted into a refrigerating mode according to conventional defrosting conditions to defrost the air conditioner, and when the air conditioner is still in the heating mode, the outdoor fan keeps a high rotating speed, so that the frosting of the outdoor unit can be effectively delayed; after the air conditioner is switched to the refrigeration mode, the frosting of the outdoor unit is serious, the outdoor unit is used as a condenser to release heat outwards, the outdoor fan keeps high rotating speed, the heat exchange between the outdoor unit and an external frost layer of the outdoor unit can be effectively improved, the defrosting efficiency of the outdoor unit is improved, the defrosting time of the air conditioner is correspondingly shortened, the adverse effect of the defrosting process of the air conditioner on the heating of the indoor environment is reduced, and the use comfort of a user is further ensured. After the air conditioner completes defrosting according to a conventional defrosting mode, the air conditioner is switched from a refrigerating mode to an initial heating mode, and the rotating speed of an outdoor fan is correspondingly reduced to the initial rotating speed.
Specifically, in this embodiment, the air conditioner may be a multi-split air conditioner, in the heating mode, the working medium flows into the outdoor unit from the indoor units through the plurality of branches, and it is determined that the lowest one of the temperatures of the branch working mediums flowing into the outdoor unit is the working medium inlet pipe temperature of the outdoor unit. In the multi-split air conditioner, after being connected in parallel, a plurality of indoor units form a circulation passage with an outdoor unit through branch pipes, under a frost delaying mode, the multi-split air conditioner executes a heating mode, working medium outlet sides of the indoor units are communicated with a working medium inlet side of the outdoor unit through corresponding branch pipes, so that the temperature of the working medium in the branch pipes jointly determines the temperature of the working medium flowing into the outdoor unit, the temperature of the lowest working medium in the branch pipes represents the worst frost formation degree which the outdoor unit can reach at present, and correspondingly, the temperature is higher than the actual working medium inlet pipe temperature of the outdoor unit, therefore, the temperature of the lowest working medium in the branch pipes is used as the working medium inlet pipe temperature of the outdoor unit, the rotating speed of an outdoor fan is regulated according to the working medium inlet pipe temperature, the regulating effect is better than the rotating speed regulation according to the actual working medium inlet pipe temperature of the outdoor unit, and the frost delaying effect of the rotating speed regulation of the outdoor fan, and a plurality of indoor units in the heating process of the multi-split air conditioner are ensured, particularly the indoor unit with the lowest working medium temperature can have a better heating effect on the indoor environment, so that the defrosting times of the multi-split air conditioner are reduced, and the use comfort of a user is improved.
FIG. 2 is a flow chart of a second method for delaying frosting according to an embodiment of the present invention.
As shown in fig. 2, the frost-retarding method includes:
s201, the air conditioner is started, and the running time of the air conditioner in the heating mode is more than or equal to the set time t0. In particular, t0The value range of (A) can be 20-40 min.
S202 obtaining outdoor environment temperature TOuter cover。
S203 judging TOuter coverWhether or not it is less than the first temperature threshold T1. If yes, executing S204; if not, executing S202. When T isOuter cover≥T1When the outdoor unit runs in the current outdoor environment, the outdoor unit is not easy to frost or the frosting degree is low, and the air conditioner executes a conventional defrosting mode; wherein, T1The range of (A) may be 1 to 3 ℃, preferably 2 ℃.
S204, controlling the air conditioner to enter a frost delaying mode.
S205 obtaining the system low pressure of the air conditionerForce PSThe working medium inlet pipe temperature T of the outdoor unit and the actual rotating speed M of the outdoor fan.
S206 judging PSAnd whether T meets the condition of delaying frosting. If so, execute 207; if not, S205 is executed.
S207 judges whether M is less than preset upper limit rotating speed MLimit of. If yes, executing S208; if not, then 209 is performed. When M is more than or equal to MLimit ofWhen the rotation speed of the outdoor fan reaches the upper limit, the rotation speed is not suitable to be increased again; when M < MLimit ofAnd when the rotation speed of the outdoor fan is higher than the preset rotation speed, the rotation speed of the outdoor fan is adjusted to be higher than the preset rotation speed.
And S208, controlling to increase the rotating speed of the outdoor fan.
S209 exits the frost-retarding mode and enters a normal defrost mode.
FIG. 3 is a partial flow chart of a third method for retarding frost formation according to an embodiment of the present invention. As shown in fig. 3, the frost-retarding method includes:
s302, acquiring system low-pressure P of air conditionerSAnd the working medium inlet pipe temperature T of the outdoor unit.
S304 judges PSWhether less than the pressure limit P is satisfiedLimit of. If not, executing S306; if yes, go to S310. Wherein, PLimit ofThe value range of (A) can be 0.05-2.1 MPa, and preferably 1.5 MPa.
S306, judging whether the working medium inlet pipe temperature T is less than a second temperature threshold value T2. If yes, go to S308.
S308, judging that T is less than T2Duration t of1Is more than or equal to the preset time length t2. If yes, go to S310. Wherein, t2The value range of (A) can be 40-80 s, preferably 60 s.
S310 determines that the frost-retarding condition is satisfied.
The above-mentioned flow is a specific judgment method for step S206, and firstly according to PSJudging when P isS＜PLimit ofIf so, determining that the air conditioner meets the condition of delaying frosting, and then continuing to execute the step S207; when in usePSWhen the T is more than or equal to the P limit, continuing to judge T, and when T is more than or equal to T2And t is1≥t2If so, determining that the air conditioner meets the condition of delaying frosting, and then continuing to execute the step S207; when P is presentS≥PLimit ofAnd T is not less than T2Or T < T2And t is1＜t2If it is determined that the air conditioner does not satisfy the frost delaying condition, the step S302 is performed again.
Of course, in other embodiments, T may be determined first, and then P may be determinedSJudging; or, for T and P simultaneouslySMaking a judgment when P is satisfiedS＜PLimit ofOr T < T2And t is1≥t2And if so, determining that the air conditioner meets the condition of delaying frosting.
FIG. 4 is a partial flow chart illustrating a fourth method for retarding frost formation, according to an embodiment of the present invention. As shown in fig. 4, the frost-retarding method includes:
s402, in the same frost delaying mode, controlling the rotation speed of the outdoor fan to be increased for the (i + 1) th time. When the air conditioner is in a conventional heating mode, the rotating speed of the outdoor fan is less than the limit M, and when the rotating speed of the outdoor fan is increased for the first time in the same frost formation delaying mode, the increased rotating speed threshold M1 can be 25-35 r/min, preferably 30 r/min.
S404, increasing the rotating speed threshold value M of the rotating speed of the outdoor fani+1＝Miδ. Wherein δ may range from 1.1 to 1.3, preferably δ is 1.2; in the same frost-delaying mode, the increase of the rotating speed regulation of the outdoor fan is increased in a gradient manner, so that the regulation effect of delaying the frost formation of the outdoor unit is improved.
S406, judging whether the actual rotating speed M of the outdoor fan after the (i + 1) th acceleration is less than the preset upper limit rotating speed M or notLimit of. If not, S408 is executed.
And S408, exiting the frost-forming delaying mode and entering a conventional defrosting mode, and operating the outdoor fan at the actual rotating speed M. When M is more than or equal to MLimit ofWhen the frosting delay condition is met, the outdoor unit is subjected to frosting delay, and the frosting delay condition is metAnd gradually frosting, controlling the air conditioner to enter a conventional defrosting mode at the moment, determining whether the air conditioner performs defrosting operation on the air conditioner according to the judgment condition of the conventional defrosting mode, and keeping the actual rotating speed M after the acceleration for the (i + 1) th time by the outdoor fan in the process.
The normal defrost mode completes one defrost S410.
The air conditioner performs an initial heating mode S412.
The above-mentioned flow is a specific control method for increasing the rotation speed, which is provided for step S208, when the air conditioner satisfies the condition of delaying frosting:
the outdoor fan is accelerated for the first time, and the threshold value of the increased rotating speed is a set value M1；
The second time of accelerating the outdoor fan, the increased rotating speed threshold value M2＝M1*δ；
The third time of accelerating the outdoor fan, the increased rotating speed threshold value M3＝M2*δ；
……
The n +1 th time of speeding up the outdoor fan, and the increased rotating speed threshold value Mn+1＝Mn*δ。
After every speed increase, whether the actual rotating speed M of the outdoor fan after speed increase is less than M or not is judgedLimit ofIf M < MLimit ofThen, the steps S205 to S208 and S402 to S406 are executed continuously; if M is greater than or equal to MLimit ofThen S408-S412 are executed continuously, and the process is circulated.
Fig. 5 is a schematic structural diagram of a control device according to an embodiment of the present invention. As shown in fig. 5, the control device includes:
and the detection module 51 is used for detecting the outdoor environment temperature. Specifically, a temperature sensor may be provided at the outdoor unit for detecting an outdoor ambient temperature.
And a determining module 52, configured to determine whether the outdoor ambient temperature is less than a first temperature threshold.
And the control module 53 is used for controlling the air conditioner to enter a frost delaying mode according to the judgment result.
The control device can execute the frost delaying method, can delay the frost degree of the outdoor unit, thereby reducing the times of defrosting operation executed by the air conditioner, correspondingly prolonging the heating duration and the heating effect of the indoor unit on the indoor environment, and improving the use comfort of users.
Optionally, the embodiment further provides an air conditioner, which includes a computer readable storage medium storing a computer program and a controller, where the computer program is read and executed by the controller to implement the air conditioner frost-formation delaying method. The computer readable storage medium of the air conditioner stores the related computer program of the method for delaying frosting, and the controller can control the rotating speed of the outdoor fan and the operation mode of the air conditioner through the computer program, so that the frequency of defrosting operation executed by the air conditioner is reduced, the heating duration and the heating effect of the indoor unit on the indoor environment are correspondingly prolonged, and the use comfort of a user is improved.
A computer-readable storage medium storing a computer program which, when read and executed by a controller, implements the above-described frost-retarding method. The computer readable storage medium includes all technical effects of the above-mentioned frost-delaying method, which are not described herein in detail.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for delaying frosting of an air conditioner is characterized by comprising the following steps:
acquiring the outdoor environment temperature;
judging whether the outdoor environment temperature is smaller than a first temperature threshold value;
and if so, controlling the air conditioner to enter a frosting delaying mode, wherein in the frosting delaying mode, the air conditioner executes a heating mode, and the rotating speed of the outdoor fan is increased.
2. The method for delaying frosting of an air conditioner according to claim 1, wherein if yes, the step of controlling the air conditioner to enter a frosting delaying mode, wherein in the frosting delaying mode, the air conditioner executes a heating mode, and the rotation speed of the outdoor fan is increased comprises:
acquiring the system low-pressure of the air conditioner, the working medium inlet pipe temperature of an outdoor unit and the actual rotating speed of an outdoor fan;
judging whether the low-pressure of the system and the working medium inlet pipe temperature meet the condition of delaying frosting or not;
and if the actual rotating speed is less than the preset upper limit rotating speed, controlling to increase the rotating speed of the outdoor fan.
3. The method for delaying frosting of an air conditioner according to claim 2, wherein the step of judging whether the low-pressure of the system and the temperature of the working medium inlet pipe meet the condition of delaying frosting comprises the following steps:
judging whether the low-pressure of the system is smaller than a pressure limit value or not;
and if so, determining that the frost delaying condition is met.
4. The method for delaying frosting of an air conditioner according to claim 2, wherein the step of judging whether the low-pressure of the system and the temperature of the working medium inlet pipe meet the condition of delaying frosting comprises the following steps:
judging whether the working medium inlet pipe temperature is smaller than a second temperature threshold value or not, wherein the duration time of the working medium inlet pipe temperature being smaller than the second temperature threshold value is greater than or equal to a preset time;
and if so, determining that the frost delaying condition is met.
5. The method for delaying frosting of an air conditioner according to claim 2, wherein if the actual rotating speed is less than the preset upper limit rotating speed, the step of controlling to increase the rotating speed of the outdoor fan comprises:
and determining a second rotating speed threshold value for increasing the rotating speed of the outdoor fan at this time according to the first rotating speed threshold value for increasing the rotating speed of the outdoor fan at the last time, wherein the second rotating speed threshold value is greater than the first rotating speed threshold value.
6. The method for delaying frosting of an air conditioner according to claim 2, wherein the method further comprises:
after the air conditioner enters the frosting delaying mode, judging whether the actual rotating speed is greater than or equal to the preset upper limit rotating speed or not;
and if so, controlling the air conditioner to exit the frosting delaying mode and enter a conventional defrosting mode.
7. The method for delaying frosting of an air conditioner according to claim 6, wherein if yes, the step of controlling the air conditioner to exit the frost delaying mode and enter a normal defrosting mode includes:
and controlling the outdoor fan to operate at the actual rotating speed when the outdoor fan exits the frosting delaying mode until the air conditioner completes one-time defrosting in the conventional defrosting mode.
8. The method as claimed in claim 2, wherein the air conditioner is a multi-split air conditioner, in a heating mode, the working medium flows from the indoor units to the outdoor unit through a plurality of branches, and the lowest one of the plurality of branch working medium temperatures flowing into the outdoor unit is determined as the working medium inlet pipe temperature of the outdoor unit.
9. A control device, comprising:
a detection module (51) for detecting an outdoor ambient temperature;
a judging module (52) for judging whether the outdoor environment temperature is less than a first temperature threshold value;
and the control module (53) is used for controlling the air conditioner to enter a frost delaying mode according to the judgment result.
10. An air conditioner comprising a computer readable storage medium storing a computer program and a controller, wherein the computer program is read by the controller and executed to implement the air conditioner frost mitigation method according to any of claims 1 to 8.
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