CN111380154A - Intelligent cleaning control method for air conditioner - Google Patents
Intelligent cleaning control method for air conditioner Download PDFInfo
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- CN111380154A CN111380154A CN202010231523.2A CN202010231523A CN111380154A CN 111380154 A CN111380154 A CN 111380154A CN 202010231523 A CN202010231523 A CN 202010231523A CN 111380154 A CN111380154 A CN 111380154A
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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
- F24F11/43—Defrosting; Preventing freezing of indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0071—Indoor units, e.g. fan coil units with means for purifying supplied 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
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump 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
- F24F2110/50—Air quality properties
- F24F2110/65—Concentration of specific substances or contaminants
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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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Abstract
The invention discloses an intelligent cleaning control method for an air conditioner. The cleaning stage comprises the following steps: frosting: an indoor heat exchanger of the air conditioner refrigerates, and a frost layer is formed on the surface of the indoor heat exchanger; a high-temperature steam washing step: after frosting, the indoor heat exchanger heats to convert the frost layer into steam, and the indoor fan operates to blow out the steam after flowing through the air duct. In the high-temperature sterilization stage, the indoor heat exchanger is kept in a heating state. According to the intelligent cleaning control method for the air conditioner, disclosed by the embodiment of the invention, the cleaning effect and the sterilization effect can be improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an intelligent cleaning control method for an air conditioner.
Background
After the air conditioner is used for a long time, a large amount of dust and dirt enters the indoor evaporator, and dust is accumulated on the evaporator. This not only influences the heat transfer performance of evaporimeter, increases the energy consumption, reduces refrigeration effect, still can breed a large amount of bacteriums on the evaporimeter, causes user's health problem.
The evaporator self-cleaning technology adopted at present mainly depends on cleaning by adopting a condensed water or evaporator frosting mode, and sterilization is carried out through normal heating and drying. However, the temperature of the indoor heat exchanger of the general air conditioner is low when the general air conditioner is in normal heating operation, and generally is between 44 ℃ and 52 ℃, and the high temperature of sterilization can not be reached. The existing self-cleaning technology has poor cleaning effect and sterilization effect.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an intelligent cleaning control method for an air conditioner, which is used for improving the cleaning and sterilizing effects of the air conditioner.
According to the intelligent cleaning control method of the air conditioner, the air conditioner is provided with an intelligent cleaning mode, and the intelligent cleaning mode comprises a cleaning stage and a high-temperature sterilization stage. The cleaning stage comprises the following steps: frosting: an indoor heat exchanger of the air conditioner performs refrigeration, and a frost layer is formed on the surface of the indoor heat exchanger; a high-temperature steam washing step: after frosting, the indoor heat exchanger heats to convert the frost layer into steam, and the indoor fan operates to blow out the steam after flowing through the air duct. In the high-temperature sterilization stage, the indoor heat exchanger is kept in a heating state.
According to the intelligent cleaning control method for the air conditioner, the frosting is firstly carried out in the cleaning stage, then the high-temperature steam cleaning is carried out, the large-viscosity impurities are favorably loosened during the frosting, the cleaning range is favorably expanded during the high-temperature steam cleaning, and the corners and the seams are favorably cleaned, so that the cleaning effect is improved. The intelligent cleaning mode comprises a cleaning stage and a high-temperature sterilization stage, wherein the cleaning stage enables microorganisms to undergo a cold-heat conversion process, cell components of the microorganisms are passively changed and are more easily broken, the high-temperature sterilization stage is favorable for enabling the microorganisms to be rapidly dehydrated in dry heat, and the combination of the two stages is favorable for improving the sterilization effect.
In some embodiments, the washing phase further comprises a water condensation step: the indoor fan is operated at a first rotating speed, and the indoor heat exchanger is refrigerated to generate enough condensed water; and automatically entering a frosting step after the water condensation step reaches a preset water condensation condition.
Optionally, after the frosting step is performed, the indoor fan stops operating first until a first preset frosting condition is reached, and then the indoor fan operates at a second rotating speed until a second preset frosting condition is reached; the second rotational speed is less than the first rotational speed.
Further, the duration time of the water condensation step and the frosting step is respectively a fixed time; alternatively, the duration of the water condensation step decreases with increasing indoor humidity, and the duration of the frosting step decreases with increasing indoor humidity.
In some embodiments, the cleaning stage further comprises a step of slowing between the frosting step and the high-temperature steam washing step: and after the system pressure difference of the air conditioner reaches a set range in the delaying step, performing high-temperature steam washing.
In the step of waiting for slowing, whether the system pressure difference reaches a set range is detected by detecting the pressure difference between the high pressure of the system and the low pressure of the system or detecting the temperature difference between the condensation temperature of the system and the evaporation temperature of the system.
In the step to be slowed, the compressor is directly stopped to enable the system pressure difference to reach a set range; or in the step of waiting for slowing, the frequency of the compressor is reduced or the opening degree of the throttling element is increased so that the system pressure difference reaches a set range.
In some embodiments, the indoor fan is stopped after the high temperature steam washing step is started, and the indoor fan is operated to blow out the steam after the preset steam washing condition is reached.
Optionally, the preset steaming and washing condition is that the temperature of the indoor heat exchanger reaches a preset steaming and washing temperature, or the high-temperature steam washing step lasts for a preset steaming and washing time.
In some embodiments, in the smart cleaning mode, the cleaning phase may be performed first and then the pasteurization phase, or the pasteurization phase may be performed first and then the cleaning phase;
in the intelligent cleaning mode, a one-time cleaning phase or a plurality of cleaning phases are included;
in the intelligent cleaning mode, one high-temperature sterilization stage or a plurality of high-temperature sterilization stages are included.
In some embodiments, when the high-temperature sterilization phase is followed by the washing phase, the intelligent cleaning mode further includes a waiting phase interposed therebetween, and the washing phase is entered after the system pressure difference of the air conditioner reaches a set range in the waiting phase.
In some embodiments, the intelligent cleaning mode further comprises a drying stage, wherein the intelligent cleaning mode firstly carries out a cleaning stage, the air conditioner enters a high-temperature sterilization stage when a trigger condition is met after the cleaning stage is finished, and the air conditioner enters the drying stage when the trigger condition is not met; in the drying stage: the indoor heat exchanger keeps a heating state, and the indoor fan operates.
Specifically, the air conditioner has at least one of the following cases: the air conditioner is provided with a concentration detection piece for detecting the concentration of microorganisms in a room or in the air conditioner, and when the detection value of the concentration detection piece reaches a preset concentration, the trigger condition is met, otherwise, the trigger condition is not met; the air conditioner has user options, and when the user selects sterilization, the triggering condition is met, otherwise, the triggering condition is not met.
Further, the termination condition of the smart cleaning mode is one of:
the air conditioner starts timing from entering the intelligent cleaning mode, and exits the intelligent cleaning mode when the time lasts for a first set total time;
the intelligent cleaning mode starts to time from the high-temperature sterilization stage, and exits from the intelligent cleaning mode when the duration reaches the second set total time.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of an intelligent cleaning control method for an air conditioner according to an embodiment of the present invention.
Fig. 2 is a flow chart of an intelligent cleaning control method for an air conditioner according to another embodiment of the invention.
Fig. 3 is a flowchart of an intelligent cleaning control method for an air conditioner according to another embodiment of the present invention.
Fig. 4 is a flowchart illustrating a control procedure of the scheme 1 during a high-temperature sterilization stage of the air conditioner according to an embodiment of the present invention.
Fig. 5 is a flowchart illustrating a control procedure of the scheme 2 during a high-temperature sterilization stage of the air conditioner according to an embodiment of the present invention.
Fig. 6 is a flowchart illustrating a control procedure of scheme 3 during a high-temperature sterilization stage of the air conditioner according to an embodiment of the present invention.
Fig. 7 is a flowchart illustrating the control of the scheme 4 during the high-temperature sterilization phase of the air conditioner according to the embodiment of the present invention.
Fig. 8 is a graph showing the comparison between the outdoor ambient temperature and the compressor frequency in the high-temperature sterilization stage of the air conditioner according to the embodiment of the present invention.
Fig. 9 is a control flowchart of an air conditioner according to an embodiment of the present invention at the beginning of a high-temperature sterilization stage.
Fig. 10 is a flowchart illustrating an initial control of the air conditioner entering the high-temperature sterilization stage according to another embodiment of the present invention.
Fig. 11 is a flowchart illustrating an initial control of the air conditioner entering the pasteurization stage according to still another embodiment of the present invention.
Fig. 12 is a diagram illustrating a method for determining a time when an air conditioner enters a high-temperature sterilization stage according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
An intelligent cleaning control method of an air conditioner according to an embodiment of the present invention will be described with reference to the accompanying drawings.
The air conditioner has an intelligent cleaning mode, which includes a washing stage and a high-temperature sterilization stage, referring to fig. 1 to 3.
The cleaning stage comprises the following steps:
frosting: an indoor heat exchanger of the air conditioner refrigerates, and a frost layer is formed on the surface of the indoor heat exchanger;
a high-temperature steam washing step: after frosting, the indoor heat exchanger heats to convert the frost layer into steam, and the indoor fan operates to blow out the steam after flowing through the air duct.
In the high-temperature sterilization stage, the indoor heat exchanger is kept in a heating state.
Specifically, in the cleaning stage, the frosting step is arranged in such a way that the refrigerating cycle is carried out through the indoor heat exchanger, so that the space where the indoor heat exchanger is located gradually forms condensed water, and the condensed water is gradually condensed into frost. In the process of condensing water vapor in the space, a large amount of water vapor in the air can be atomized to form small water drops, so that dust in the air is brought away when the water drops drop to the water receiving tray, and the dust and impurities on the parts can be washed away in the process that the water drops flow downwards along the indoor heat exchanger and the surrounding parts (such as electric auxiliary heat and various supporting and fixing frames).
Especially when the surface of the component forms a frost layer, the lower temperature is favorable for killing viruses and bacteria, and when ice particles are condensed on impurities with large viscosity on the surface of the component, the impurities are easy to loosen from the surface of the component along with the expansion process of freezing the condensed water by water, and the loosened impurities are easy to flow to the water receiving disc along with the condensed water after defrosting.
The high-temperature steam washing step is carried out after the frosting step, the process from frosting to defrosting is finished, and for microorganisms, liquid substances in cells are converted from quick cooling to quick heating, the cells are more easily broken due to the fact that the temperature greatly affects all components of the cells, and the lethality rate of the microorganisms can be improved due to the quick-finished cold and hot alternation, and the killing effect is improved.
Through setting up the high temperature steam and washing the step, make and exist a large amount of water vapor in the air conditioner temporarily, water vapor can condense into water and flow downwards when meetting the part surface to take away the dust. It should be noted that the condensed water formed in the early stage of the frosting step is mainly concentrated on the indoor heat exchanger, and the lower amount of condensed water is large and the upper amount of condensed water is small because the water flows downwards. However, in the high-temperature steam washing step, because the condensed water is formed by condensing the heated steam, the steam rises upwards, and a large amount of steam can fill the space where the indoor heat exchanger is located, the steam can flow to the surfaces of surrounding parts, and the steam can also flow to corners and slits. When the indoor fan operates to blow out the steam after flowing through the air duct, the high-temperature steam can also clean the inner wall of the air duct and bring the dust on the inner wall of the air duct out of the air conditioner.
In the high-temperature sterilization stage, the indoor heat exchanger is kept in a dry and hot state, and water is easy to lose in the dry and hot state, so that the dehydration and the killing of microorganisms are facilitated. The high-temperature sterilization stage is matched with the cleaning stage, so that the killing probability of microorganisms is greatly improved, and the sterilization effect is improved.
In the scheme of the invention, the high-temperature sterilization stage is to keep the indoor heat exchanger in a temperature range favorable for sterilization for a period of time. Specifically, the air conditioner may detect the temperature T2 of the indoor heat exchanger, control the temperature T2 of the indoor heat exchanger to be maintained between T1 and Th during the high temperature sterilization period, and maintain this temperature interval for at least a preset sterilization time. Wherein, T2 can be the temperature of a certain place (such as a coil) of the indoor heat exchanger, T1 is the lowest temperature of the sterilization control, and Th is the highest temperature of the sterilization control. T1 and Th can be set according to actual needs, for example, the air conditioner can kill new coronavirus, the virus can be killed after being kept for a period of time at 56 degrees according to the diagnosis and treatment scheme (trial version) of new coronavirus pneumonia issued by the national Weijian Commission, and T1 and Th can be set according to the data, for example, T1 is 56 degrees, Th is 58 degrees, and the like.
Referring to fig. 4 to 7 in particular, during the high-temperature sterilization stage, the air conditioner may be operated in a default heating mode (and may also be operated in a drying mode), and it is detected whether T2 reaches a sterilization temperature range after T1 minutes of operation. If the temperature reaches the sterilization temperature range, the operation state is maintained, and if the temperature does not reach the sterilization temperature range, the temperature is detected by adjusting at least one of the frequency of the compressor, the wind speed of the indoor fan and the opening degree of the throttling element (if the air conditioner is provided with electric auxiliary heat, the heating value of the electric auxiliary heat is also included) and then T2 is detected after the adjustment. This is repeated until T2 reaches a temperature range for sterilization.
In order to increase the temperature increase rate, when the pasteurization stage is started, as shown in fig. 4, 6, and 7, the frequency f0 of the compressor may be set to the current maximum frequency for operation. The current maximum frequency of the compressor, i.e., the frequency limited frequency of the compressor at the current outdoor ambient temperature T4 (since the compressor is susceptible to overheating damage if the frequency is not limited when the ambient temperature is high). The frequency limiting frequency can be searched from a database of the air conditioner in a table look-up mode. Assuming that the limited frequency is f1, this f1 can be looked up by the table shown in fig. 8. When the air conditioner is adjusted, the air level of the indoor fan, the opening degree of the electronic expansion valve, the electric auxiliary heating gear and the like can be adjusted. The compressor frequency can also be adjusted if desired.
When the pasteurization stage is started, as shown in fig. 5, the frequency f0 of the compressor may be set to the initial frequency preset by the air conditioner. And when the temperature is adjusted, the frequency of the compressor, the wind level of the indoor fan, the opening degree of the electronic expansion valve, the electric auxiliary heating gear and the like can be adjusted. The initial frequency also needs to be set according to the outdoor ambient temperature T4, and assuming that the initial frequency is f1, this f1 can be looked up by the table shown in fig. 8.
In one specific example, after entering the pasteurization stage, the compressor's lower frequency f0 is operated at the initial frequency f1, where f1 is the frequency limit frequency at the outdoor ambient temperature T4. The evaporator presets a first temperature target value TE _ B (e.g. 48 ℃) during high-temperature disinfection, and the TE _ B is close to the target temperature value but is smaller than the TE _ A (e.g. 56 ℃). The outdoor compressor is first operated at the preset frequency f1 without reaching the preset first temperature target value TE _ B. And calculating the difference variation of the current indoor evaporator temperature and a preset first temperature target value, and adjusting the indoor fan rotating speed according to the variation amplitude and a preset adjusting period, so that the indoor evaporator temperature is quickly close to the preset first temperature target value.
In this example, the temperature of the indoor heat exchanger is increased by lowering the indoor fan to an ultra-low rotation speed. Wherein, indoor fan speed range: 50rpm to 1800rpm, and can be adjusted in a wide range. The normal rotation speed is 500-1200 rpm, which exceeds the normal range. The indoor fan is reduced, so that the temperature of the indoor heat exchanger is increased to ultrahigh temperature to disinfect the heat exchanger.
In some embodiments, the washing phase further comprises a water condensation step: the indoor fan runs at a first rotating speed, and the indoor heat exchanger refrigerates to generate enough condensed water; and automatically entering a frosting step after the water condensation step reaches a preset water condensation condition. That is, after the cleaning stage, the air conditioner performs a water condensation step, a frosting step, and a high-temperature steam washing step. It will be appreciated that the frosting step operates with the aim of rapid frosting, and that the amount of condensed water, although it may be produced, is limited. The water condensing step is set to generate enough condensed water on the indoor heat exchanger, so that the condensed water can wet enough surface of the indoor heat exchanger.
It can be understood that when the indoor heat exchanger is a fin heat exchanger, the specific surface area of the fins is large, and when the amount of condensed water is small, most of the surfaces of the fins cannot be wetted. The water condensation step is arranged to generate enough condensed water to wet the fins, so that the frost formation step has enough condensed water to form a frost layer with enough thickness, and the frost formation step can have the frost layer formed on the surfaces of the fins.
In the water condensing step, the air conditioner is operated in a mode of high condensed water generating speed of the air conditioner or a mode of high condensed water generating amount (a mode of high dehumidification amount). At this time, the temperature of the indoor heat exchanger is low, and the indoor fan operates at a rotating speed matched with the temperature, so that a large amount of indoor air containing water vapor flows through the indoor heat exchanger to generate a large amount of condensed water.
It should be noted that the air conditioner in the related art has a dehumidification mode for rapidly removing indoor moisture in hot and humid weather. The operating parameters of the air conditioner during dehumidification are the prior art, and the air conditioner can operate in a state of a dehumidification mode of the existing air conditioner according to the state when entering a water condensation step. In the water condensing step, to ensure a sufficient amount of condensed water, the first rotation speed may be a preset fixed value, and the first rotation speed may also be changed with the passage of time, and the first rotation speed of the indoor fan is set for the purpose of "the dehumidification amount is the largest, and the generated condensed water is the largest", and is not limited specifically here.
The setting of the preset condition of the condensed water is flexible and can be flexibly set according to actual needs. In one embodiment, the water condensation preset condition is that the water condensation step lasts for a first preset time. Here, the first preset time may be a fixed time or may vary according to the indoor humidity, and the higher the indoor humidity is, the shorter the first preset time is. The condition of predetermineeing of congealing also can set up through other modes, for example the air conditioner has humidity to detect the meter (detect indoor humidity or humidity in the air conditioner), through the data change that detects the meter in the step of congealing the water, can embody the degree of going on of the step of congealing the water, and the air conditioner gets into the step of frosting by the step of congealing automatically after humidity detects the meter data change and reaches certain degree.
Of course, in some examples, the water condensing step may not be provided, and in this case, the water requirement of the high-temperature steam washing step may be supplemented by filling water into the air conditioner.
In some embodiments, after the frosting step, the indoor fan is stopped to reach a first preset frosting condition, and then the indoor fan is operated at a second rotating speed to reach a second preset frosting condition. Wherein the second rotation speed is less than the first rotation speed.
Here, when frosting, the indoor fan stops operating earlier, has reduced the air and has flowed the back, and the cold volume that indoor heat exchanger produced no longer runs off, and cold volume concentrates to be used on the condensate water around the indoor heat exchanger, makes the condensate water quickly become the frost layer. And after the frost layer reaches certain thickness, the frost layer may be unfavorable for cold volume to continue to diffuse from indoor heat exchanger, and control indoor fan at this moment and operate with the second rotational speed, be favorable to the air to flow in the small range, make cold volume can spill over from indoor heat exchanger in to can thicken the frost layer, be favorable to the frost layer to permeate to the indoor heat exchanger and in the slit of refrigerant around, for example in the middle of the fin.
Specifically, the second rotation speed is an ultra-low rotation speed of the indoor fan, optionally, the second rotation speed is between 0rpm and 500rpm, and further optionally, the second rotation speed is 150 rpm. In some examples, the second speed may be variable.
The first preset frosting condition and the second preset frosting condition are flexibly set and can be flexibly set according to actual needs. In one embodiment, the first preset frosting condition is that the indoor fan is stopped for a second preset time after the frosting step is started, and the second preset frosting condition is that the indoor fan is operated again for a third preset time. Here, the second preset time and the third preset time may be fixed times or may vary according to the humidity of the room. The higher the indoor humidity is, the shorter the second preset time and the third preset time are. The first preset frosting condition and the second preset frosting condition can be set in other modes, for example, the air conditioner is provided with a temperature detector (for detecting the surface temperature of the indoor heat exchanger or the temperature of the internal refrigerant), and the progress degree of the frosting step can be reflected through the data change of the temperature detector in the frosting step, so that the state switching of the air conditioner is controlled.
In some embodiments, the cleaning stage further comprises a step of slowing between the frosting step and the high-temperature steam washing step: and after the system pressure difference of the air conditioner reaches a set range in the delaying step, performing high-temperature steam washing.
This is because the indoor heat exchanger is in a cooling state in the frosting step and in a heating state in the high-temperature steam washing step, and switching between the two steps means that the refrigerant circulation path is switched. Therefore, a waiting step is inserted between the two steps, and the heating cycle can be switched after the system pressure is balanced, so that the system reliability is improved. In some air conditioners, the pressure can be kept better when the state is switched, and the cleaning stage of the air conditioner can be free from a waiting and slowing step.
In some embodiments, in the step of waiting for slowing, whether the system pressure difference reaches the set range is reflected by detecting the pressure difference between the system high pressure and the system low pressure or detecting the temperature difference between the system condensing temperature and the system evaporating temperature.
In the step to be slowed, if it is detected, if the set range is not reached, the system pressure difference is brought to the set range by reducing the compressor frequency or increasing the opening degree of the throttling element.
In some cases, the compressor is directly stopped in the waiting step to make the system pressure difference reach the set range. The compressor is stopped for a fourth preset time, the process of the step to be delayed is controlled by time, the control mode is simple, and the reliability is high. Optionally, the fourth preset time is within a range from 0min to 20min, and further optionally, the fourth preset time is within a range from 0.5min to 5.5 min.
Further, in the standby step, the indoor fan may be operated at a low rotation speed or may be stopped, so that the air flow may be reduced.
In some embodiments, after the high temperature steam washing step is started, the indoor fan is stopped, and after the preset steam washing condition is reached, the indoor fan is operated again to blow out the steam.
When the high-temperature steam washing step is carried out, the indoor fan stops running first, so that the heat generated by the indoor heat exchanger is not lost after the air flow is reduced, and the heat is intensively applied to a frost layer and condensed water around the indoor heat exchanger to be quickly converted into steam. During the period, because air is not blown out of the air conditioner, high-temperature steam is retained in the air conditioner for a period of time, the high-temperature steam can be fully infiltrated to the surfaces of surrounding parts in the air conditioner, particularly to a seam and a corner (the air pressure of the high-temperature steam rises when the air is stopped, and the high-temperature steam is favorably filled into the corner seam), and therefore, a large-range cleaning process is formed when the high-temperature steam in a large range is discharged after the indoor fan is operated.
Specifically, the preset steaming-washing condition is that the temperature of the indoor heat exchanger reaches the preset steaming-washing temperature, that is, the indoor fan is shut down in the high-temperature steam washing step, and the indoor fan is operated to blow out steam after the temperature of the indoor heat exchanger reaches the preset steaming-washing temperature. The high-temperature steam is controlled by temperature in the first step, and the control mode is simple and direct. Optionally, the preset steaming and washing temperature is in a range of 0 ℃ to 90 ℃, and further optionally, the preset steaming and washing temperature is 45 ℃. When the indoor fan operates again to blow out steam, the rotating speed of the indoor fan can be flexibly set, for example, the indoor fan can operate at a fixed rotating speed, and can also be set slowly and then quickly.
In some examples, the steaming and washing preset condition is that the high temperature steam washing step is continued for a steaming and washing preset time. Therefore, the timing control is more convenient and reliable.
The indoor fan may also be turned on at the beginning of the high temperature steam wash step, but initially at a lower wind speed (e.g., 0-10rpm) to allow the steam to diffuse around under the wind flow. After diffusion to a certain extent (for a certain time), the rotation speed is increased again.
In some embodiments, in the intelligent cleaning mode, the cleaning phase may be performed first and then the pasteurization phase, or the high temperature sterilization phase may be performed first and then the cleaning phase. The order of the phase combinations here is very flexible.
In the intelligent cleaning mode, a single washing stage or a plurality of washing stages are included. When the washing stage is carried out for a plurality of times, the washing stage can be continuously carried out or the high-temperature sterilization stage can be carried out alternatively. In the intelligent cleaning mode, a high-temperature sterilization stage or a plurality of high-temperature sterilization stages are included, and the high-temperature sterilization stages can be intermittently carried out or cleaning stages can be alternately carried out. Not intended to be limiting.
When the intelligent cleaning mode starts with the high temperature sterilization stage, the air conditioner needs to judge the current mode first. According to fig. 9-10, if the heating mode is currently in use, the high-temperature sterilization stage is directly performed according to the method 1-4. If the current mode is the shutdown or air supply mode, the air conditioner is switched to the heating mode, and the high-temperature sterilization stage is carried out according to the methods 1 to 4. If the current mode is the refrigeration or dehumidification mode, whether the system state is balanced needs to be judged, the mode is switched to the heating mode after the system state is balanced, and the high-temperature sterilization stage is carried out according to the methods 1 to 4.
There are various ways to determine whether the system state is balanced, for example, in fig. 9, the pressure difference is taken as the difference between the system high pressure and the system low pressure, the high pressure is the condensing pressure (or the exhaust pressure), and the low pressure is the evaporating pressure (or the return pressure). For example, in fig. 10, the temperature difference is taken as a judgment, and the temperature difference is a difference value between the system condensation temperature and the system evaporation temperature. As shown in fig. 11, if the current mode is the cooling or dehumidifying mode, the system is directly stopped for Xmin, then switched to the heating mode, and the high-temperature sterilization stage is performed according to the methods 1 to 4, without determining whether the system state is balanced. In fig. 9 to 11, X represents a value that can be set according to actual conditions, and X does not represent an equivalent value in the three drawings.
In some embodiments, when the high-temperature sterilization phase is followed by the washing phase, the intelligent cleaning mode further includes a waiting phase interposed therebetween, and the washing phase is entered after the system pressure difference of the air conditioner reaches a set range in the waiting phase.
This is because the indoor heat exchanger is in a heating state in the high-temperature sterilization stage, and the indoor heat exchanger is in a cooling state initially in the cleaning stage, and the switching of the two steps means that the refrigerant circulation path is switched. Therefore, a waiting and slowing stage is inserted between the two steps, and the refrigerating cycle can be switched after the system pressure is balanced, so that the system reliability is improved. The air conditioner may not be provided with a waiting period.
In some embodiments, in the waiting period, whether the system pressure difference reaches the set range is reflected by detecting the pressure difference between the system high pressure and the system low pressure or detecting the temperature difference between the system condensing temperature and the system evaporating temperature.
In the waiting period, if detection is carried out, if the set range is not reached, the system pressure difference reaches the set range by reducing the frequency of the compressor or increasing the opening degree of the throttling element.
In some cases, during the ramp-down phase, the compressor is shut down directly to bring the system pressure differential to the set range. The compressor is stopped for the fifth preset time, the process of the waiting-to-slow stage is controlled by time, the control mode is simple, and the reliability is high. Optionally, the fifth preset time is within a range from 0min to 20min, and further optionally, the fifth preset time is within a range from 0.5min to 5.5 min.
Further, in the waiting period, the indoor fan may be operated at a low rotation speed or may be stopped, so that the air flow may be reduced.
In some embodiments, the intelligent cleaning mode further comprises a drying phase, the intelligent cleaning mode performs a cleaning phase first, the air conditioner enters a high-temperature sterilization phase when the trigger condition is met after the cleaning phase is completed, and the air conditioner enters the drying phase when the trigger condition is not met. Through the selection of the high-temperature sterilization stage and the drying stage, the air conditioner is more flexibly arranged, sterilization is not needed when the triggering condition is not met, and the consumption of the air conditioner is reduced.
Wherein, in the drying stage: the indoor heat exchanger keeps a heating state, and the indoor fan operates. The drying step is arranged in such a way that condensed water in the air conditioner is fully converted into steam through drying after the cleaning step, particularly, the condensed water step is arranged in the cleaning step in order to enlarge the attachment surface of the condensed water, and the frosting step is arranged in order to enlarge the attachment layer of the frost layer, so that the condensed water and the frost layer remained in the corners and the slits can be fully converted into steam through the drying step, the steam is discharged out of the air conditioner, and the condensed water is prevented from being retained in the corners and the slits to cause the breeding of bacteria.
Specifically, the drying phase needs to continue until reaching the preset drying condition, for example, the preset drying condition is that the drying phase continues to reach a seventh preset time. The seventh preset time may be a fixed time or may vary according to the indoor humidity, and the higher the indoor humidity is, the longer the seventh preset time is.
Specifically, the air conditioner includes at least one of the following cases.
In one case, the air conditioner has a concentration detection member for detecting the concentration of microorganisms in a room or in the air conditioner, and the trigger condition is satisfied when the detection value of the concentration detection member reaches a preset concentration, or the trigger condition is not satisfied. The microorganism may be a virus or a bacterium, and is not limited herein.
The other situation is as follows: the air conditioner has user options, and when the user selects sterilization, the triggering condition is met, otherwise, the triggering condition is not met. The user options are also very flexible to be set on a mobile terminal (such as a remote controller, a mobile phone) or a controller on an air conditioner.
The triggering conditions can be set as one or both of the air conditioners. When the air conditioner sets a plurality of trigger conditions, the priority of each trigger condition may be set in advance, for example, the priority of the user option may be higher than the priority of the density detection.
The trigger condition may be other conditions, for example, the air conditioner may be a trigger condition according to a current time period, and the trigger condition is not satisfied when the smart cleaning mode is turned on in a certain time period during the day, and the trigger condition is satisfied when the smart cleaning mode is turned on in a certain time period at night. Or the air conditioner is used as a trigger condition according to the indoor position of the air conditioner, the trigger condition is met when the air conditioner is in a bedroom, and the trigger condition is not met when the air conditioner is in a living room.
Of course, in some embodiments, after the cleaning stage is completed, the high-temperature sterilization stage is directly performed, and the air conditioner does not set the trigger condition, so that the detection of the trigger condition is not required.
In some embodiments, the air conditioner performs shutdown blowing at the end of the smart cleaning mode, i.e., the compressor stops operating while the indoor fan continues to operate. The residual heat in the air conditioner is dissipated through air flow, and aging and the like caused by residual heat in the local part of the air conditioner are avoided. In some embodiments, the last of the multiple stages is a drying stage, and the air supply may be stopped or stopped during the drying stage.
In some embodiments, the termination condition of the smart cleaning mode is one of:
the air conditioner starts timing from entering the intelligent cleaning mode, and exits the intelligent cleaning mode when the air conditioner continues to reach the first set total time;
the intelligent cleaning mode starts to time from the high-temperature sterilization stage, and exits from the intelligent cleaning mode when the duration reaches the second set total time.
The two timing modes are very flexible, and can meet the requirements of various actual working conditions.
The setting of the first set total time and the second set total time may be fixed. Referring also to fig. 12, a reasonable time is selected according to the outdoor ambient temperature and the indoor ambient temperature. As shown in fig. 12, when both the indoor and outdoor ambient temperatures are 5 degrees or less, the second set total time is 55 min.
In some embodiments, control is required for the duration of the pasteurization stage. In some examples, the time control is performed, and the timing is started from entering a high-temperature sterilization stage, so that the longest operation time is limited; or after the high-temperature sterilization stage is started, timing is started when the indoor heat exchanger reaches the high-temperature sterilization temperature; or the total self-cleaning time is determined according to the working condition, and is related to the outdoor environment temperature T4 and the indoor environment temperature T1. In some embodiments, the operation time of the intelligent cleaning mode is limited, and the self-cleaning operation is started and timed, and the self-cleaning operation is exited after the predetermined time period is accumulated.
In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (14)
1. An intelligent cleaning control method for air conditioner is characterized in that the air conditioner has an intelligent cleaning mode, the intelligent cleaning mode comprises a cleaning stage and a high-temperature sterilization stage,
the cleaning stage comprises the following steps:
frosting: an indoor heat exchanger of the air conditioner performs refrigeration, and a frost layer is formed on the surface of the indoor heat exchanger;
a high-temperature steam washing step: after frosting, the indoor heat exchanger heats to convert the frost layer into steam, and the indoor fan operates to blow out the steam after flowing through the air duct;
in the high-temperature sterilization stage, the indoor heat exchanger is kept in a heating state.
2. The intelligent cleaning control method for the air conditioner as claimed in claim 1, wherein the washing stage further comprises a water condensing step: the indoor fan is operated at a first rotating speed, and the indoor heat exchanger is refrigerated to generate enough condensed water; and automatically entering a frosting step after the water condensation step reaches a preset water condensation condition.
3. The intelligent cleaning control method for the air conditioner as claimed in claim 2, wherein after the frosting step, the indoor fan stops operating until reaching a first preset frosting condition, and then the indoor fan operates at a second rotating speed until reaching a second preset frosting condition; the second rotational speed is less than the first rotational speed.
4. The intelligent cleaning control method for air conditioner according to claim 2, characterized in that the duration of the water condensation step and the frost formation step is respectively a fixed time; alternatively, the duration of the water condensation step decreases with increasing indoor humidity, and the duration of the frosting step decreases with increasing indoor humidity.
5. The intelligent cleaning control method of air conditioner as claimed in claim 1, further comprising a step of waiting for slowing down between the step of frosting and the step of high temperature steam washing in the washing stage, and entering the step of high temperature steam washing after the system pressure difference of the air conditioner reaches a set range in the step of waiting for slowing down.
6. The intelligent cleaning control method for air conditioner according to claim 5, characterized in that in the waiting step, whether the system pressure difference reaches the set range is detected by detecting the pressure difference between the system high pressure and the system low pressure, or by detecting the temperature difference between the system condensing temperature and the system evaporating temperature.
7. The intelligent cleaning control method for the air conditioner according to claim 5, characterized in that in the step of waiting for delay, the compressor is directly stopped to make the system pressure difference reach the set range; or in the step of waiting for slowing, the frequency of the compressor is reduced or the opening degree of the throttling element is increased so that the system pressure difference reaches a set range.
8. The intelligent cleaning control method for air conditioner as claimed in claim 1, wherein the indoor fan is stopped after the high temperature steam washing step is started, and the indoor fan is operated again to blow out steam after the preset steaming washing condition is reached.
9. The intelligent cleaning control method for air conditioner according to claim 8, wherein the preset steaming-washing condition is that the temperature of the indoor heat exchanger reaches the preset steaming-washing temperature, or the high temperature steam washing step continues for the preset steaming-washing time.
10. The intelligent cleaning control method for air conditioner as claimed in claim 1, wherein in the intelligent cleaning mode, the cleaning phase is performed first and then the high temperature sterilization phase is performed, or the high temperature sterilization phase is performed first and then the cleaning phase is performed;
in the intelligent cleaning mode, a one-time cleaning phase or a plurality of cleaning phases are included;
in the intelligent cleaning mode, one high-temperature sterilization stage or a plurality of high-temperature sterilization stages are included.
11. The intelligent cleaning control method of air conditioner as claimed in claim 10, wherein when the cleaning phase is performed after the high temperature sterilization phase, the intelligent cleaning mode further includes a waiting phase interposed therebetween, and the cleaning phase is performed after the system pressure difference of the air conditioner reaches a set range in the waiting phase.
12. The intelligent cleaning control method of the air conditioner as claimed in claim 1, wherein the intelligent cleaning mode further comprises a drying stage, the intelligent cleaning mode firstly performs a cleaning stage, the air conditioner enters a high temperature sterilization stage when a trigger condition is met after the cleaning stage is completed, and the air conditioner enters the drying stage when the trigger condition is not met;
in the drying stage: the indoor heat exchanger keeps a heating state, and the indoor fan operates.
13. The intelligent cleaning control method for air conditioner according to claim 12, characterized in that the air conditioner has at least one of the following conditions:
the air conditioner is provided with a concentration detection piece for detecting the concentration of microorganisms in a room or in the air conditioner, and when the detection value of the concentration detection piece reaches a preset concentration, the trigger condition is met, otherwise, the trigger condition is not met;
the air conditioner has user options, and when the user selects sterilization, the triggering condition is met, otherwise, the triggering condition is not met.
14. An intelligent cleaning control method for air conditioner according to any one of claims 1-13, characterized in that the termination condition of the intelligent cleaning mode is one of the following:
the air conditioner starts timing from entering the intelligent cleaning mode, and exits the intelligent cleaning mode when the time lasts for a first set total time;
the intelligent cleaning mode starts to time from the high-temperature sterilization stage, and exits from the intelligent cleaning mode when the duration reaches the second set total time.
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