CN114234349A - Self-cleaning method and device for indoor side heat exchanger of air conditioner and air conditioner - Google Patents
Self-cleaning method and device for indoor side heat exchanger of air conditioner and air conditioner Download PDFInfo
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- CN114234349A CN114234349A CN202111356459.1A CN202111356459A CN114234349A CN 114234349 A CN114234349 A CN 114234349A CN 202111356459 A CN202111356459 A CN 202111356459A CN 114234349 A CN114234349 A CN 114234349A
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- side heat
- indoor side
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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
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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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
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/22—Cleaning ducts or apparatus
- F24F2221/225—Cleaning ducts or apparatus using a liquid
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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
Abstract
Provided is a self-cleaning method of an indoor side heat exchanger of an air conditioner, including: s1: when the air conditioner enters a self-cleaning mode, the frosting of the indoor heat exchanger is realized by adjusting the rotating speed of the motor and the deflection angle of the air guide blade; s2: stopping the indoor heat exchanger from frosting when a preset condition is met, reversing the motor, driving the air guide blades forwards, and starting heating to heat the indoor heat exchanger to realize defrosting of the indoor heat exchanger; s3: when the temperature of the inner pipe of the indoor side heat exchanger is larger than the preset temperature threshold value or the continuous defrosting time of the indoor side heat exchanger reaches the preset time, continuing to execute the steps S1 and S2; s4: and when the steps S1 and S2 are periodically executed and reach the preset times, stopping the work of the compressor, reversing the motor of the air conditioner fan, starting electric heating, and exiting the self-cleaning mode when the temperature of the inner pipe of the indoor side heat exchanger is higher than the preset drying temperature. The scheme of the invention realizes the purposes of rapid defrosting of the indoor side heat exchanger and air duct drying, does not need to arrange a four-way valve component, uses a heat pump heating mode to defrost, and saves the cost.
Description
Technical Field
The invention relates to the field of intelligent control, in particular to a self-cleaning method and device for an indoor side heat exchanger of an air conditioner and the air conditioner.
Background
When the air conditioner is used, the heat exchange of the inner heat exchanger and the outer heat exchanger cannot be carried out, the heat exchanger takes away the cold (heat) quantity of the heat exchanger by using the air quantity generated by the rotation of the fan, and simultaneously, dust in a room is inevitably absorbed into the air conditioner, although a filter screen can block most of dust, the dust smaller than the meshes of the filter screen still adheres to the indoor heat exchanger along with air flow, so that the heat exchanger of the air conditioner is easily clogged, the thermal resistance is increased, the heat exchange effect is poor, and the refrigerating capacity of the air conditioner is insufficient; the mixed condensate water of the heat exchanger on the indoor side is easy to breed bacteria, mildew and smell, cause secondary pollution and cause air conditioner diseases. In order to ensure the heat exchange efficiency of the air conditioner and the indoor air quality, the air conditioner needs to be cleaned regularly.
If the heat exchanger is cleaned by manpower, it is time-consuming and labor-consuming, and these problems can be solved to some extent by many of the disclosed air conditioner self-cleaning techniques. However, the existing self-cleaning technology is basically realized for a split heat pump machine with double motors: the double motors can be skillfully set by rotating speeds of the inner motor and the outer motor, for example, one motor works and the other motor does not work, so that the indoor heat exchanger is easy to frost; and defrosting is achieved by heating the heat exchanger on the inner side of the heating chamber through the heat pump to melt frost on the heat exchanger on the inner side of the heating chamber, so that self-cleaning is achieved.
For an integral single-cooling machine which only has one motor to drive indoor and outdoor fan blades simultaneously, the inner and outer fan blades rotate simultaneously along with a motor shaft or stop simultaneously, and few patents which disclose that the integral machine can realize an evaporation self-cleaning function are known at present. For example, in the blower assembly for self-cleaning of an air conditioner and the control method thereof in the prior art, an indoor complex clutch mechanism is required to realize the purpose of frosting by asynchronous inner and outer fan blades, or one more capillary assembly and one more reversing valve are required to realize frosting. Therefore, there is a need in the art for a self-cleaning solution for an indoor side heat exchanger of an integral air conditioner.
The above information disclosed in the background section is only for further understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention provides a self-cleaning method and a self-cleaning device for an indoor side heat exchanger of an air conditioner and the air conditioner.
The first aspect of the present invention provides a self-cleaning method for an indoor side heat exchanger of an air conditioner, comprising: s1: when the air conditioner enters a self-cleaning mode, the frosting of the indoor heat exchanger is realized by adjusting the rotating speed of the motor and the deflection angle of the air guide blade; s2: stopping the indoor heat exchanger from frosting when a preset condition is met, reversing the motor, turning a positive air guide blade, and starting electric heating to heat the indoor heat exchanger to raise the temperature so as to defrost the indoor heat exchanger; s3: when the temperature of the inner pipe of the indoor side heat exchanger is larger than the preset temperature threshold value or the continuous frosting time of the indoor side heat exchanger reaches the preset time, continuing to execute the steps S1 and S2; s4: and when the steps S1 and S2 are periodically executed and reach the preset times, stopping the work of the compressor, reversing the motor of the air conditioner fan, starting electric heating, and exiting the self-cleaning mode when the temperature of the inner pipe of the indoor side heat exchanger is higher than the preset drying temperature.
According to an embodiment of the present invention, the preset conditions are: the temperature of an inner pipe of the indoor side heat exchanger is less than or equal to zero and lasts for a first preset time.
According to an embodiment of the present invention, the step S1 further includes: and detecting the temperature of the inner pipe of the indoor side heat exchanger, the temperature of the outdoor environment, the temperature of the outer pipe of the outdoor side heat exchanger and the temperature of the exhaust pipe.
According to an embodiment of the present invention, the step S1 further includes, after the preset second time, if the temperature of the inner tube of the indoor-side heat exchanger is greater than zero and the rotation speed of the motor is greater than a preset first low rotation speed, decreasing the rotation speed of the motor every predetermined time period.
According to an embodiment of the present invention, the step S2 further includes: the preset conditions are as follows: when the rotating speed of the motor reaches a preset first low rotating speed, or the temperature of the outer pipe of the outdoor heat exchanger is greater than or equal to the warning value of the temperature of the outer pipe of the outdoor heat exchanger and/or the temperature of the exhaust pipe is greater than or equal to the warning value of the temperature of the exhaust pipe, or the continuous frosting time reaches a preset time, if the temperature of the inner pipe of the indoor heat exchanger is still greater than zero degree; when the preset condition is met, the frosting of the indoor side heat exchanger is stopped, the motor is reversely rotated and runs for a third preset time to realize the self-cleaning of the indoor side heat exchanger.
According to an embodiment of the present invention, the first low rotation speed is a preset minimum allowable rotation speed of the motor in each outer ring temperature zone.
According to an embodiment of the present invention, wherein in the step S1, the motor speed is adjusted to be between 1/3 and 2/3 of the normal cooling low windshield speed.
According to an embodiment of the invention, the preset temperature threshold is any value in the range of 5-40 ℃, and the value range of the drying temperature is 40-60 ℃.
According to an embodiment of the invention, the duration from entering the self-cleaning mode to exiting the self-cleaning mode is between 5 minutes and 20 minutes.
The second aspect of the present invention provides a self-cleaning apparatus for an indoor side heat exchanger of an air conditioner, comprising a storage and a processor; the memory is used for storing a computer program; the processor is configured to implement the above-mentioned method when executing the computer program.
A third aspect of the invention provides an air conditioner which employs the method described above, or which comprises the apparatus described above.
The invention has the beneficial effects that: (1) the indoor heat exchanger is cleaned to purify blown air, and peculiar smell and bacteria breeding caused by dust and impurities attached to the indoor heat exchanger are reduced. (2) The indoor air quantity is increased after cleaning, the power of the whole machine is reduced, and the refrigeration efficiency is increased. (3) The single-cold machine is simple and feasible, the purposes of rapid defrosting of the indoor side heat exchanger and drying of the air channel can be realized only by additionally adding an electric heater and a reversible motor in the air channel, a four-way valve component is not needed, defrosting is realized in a heat pump heating mode, and the cost is saved. (4) The self-cleaning of the indoor side heat exchanger is realized by only depending on frosting, and the periodic positive and negative rotation of the motor activates the defrosting water or condensed water of each layer in the evaporation thickness direction to wash the fins back and forth, and the dust embedded into the gaps of the fins is ejected out through reverse airflow, so that the reverse wedge pulse dust removal effect is realized, the dust between the fins of the indoor side heat exchanger is taken away, and further, the self-cleaning of the indoor side heat exchanger is realized.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of reverse wedge dusting in accordance with an exemplary embodiment of the present invention.
Fig. 2 is a block diagram of a heat exchanger system according to an exemplary embodiment of the present invention.
FIG. 3 is a schematic view of frosting/dew flow direction and motor operation direction according to an exemplary embodiment of the present invention.
FIG. 4 is a schematic view of defrosting, dedusting airflow direction and motor operation direction according to an exemplary embodiment of the present invention.
Fig. 5 is a flowchart of a self-cleaning method of an indoor side heat exchanger of an air conditioner according to an exemplary embodiment of the present invention.
Fig. 6 is a flowchart illustrating an implementation of a self-cleaning method of an indoor side heat exchanger of an air conditioner according to an exemplary embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
As used herein, the terms "first," "second," and the like may be used to describe elements of exemplary embodiments of the invention. These terms are only used to distinguish one element from another element, and the inherent features or order of the corresponding elements and the like are not limited by the terms. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms, such as those defined in commonly used dictionaries, are to be interpreted as having a meaning that is consistent with their context in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Those skilled in the art will understand that the devices and methods of the present invention described herein and illustrated in the accompanying drawings are non-limiting exemplary embodiments and that the scope of the present invention is defined solely by the claims. Features illustrated or described in connection with one exemplary embodiment may be combined with features of other embodiments. Such modifications and variations are intended to be included within the scope of the present invention.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, a detailed description of related known functions or configurations is omitted to avoid unnecessarily obscuring the technical points of the present invention. In addition, the same reference numerals refer to the same circuits, modules or units throughout the description, and repeated descriptions of the same circuits, modules or units are omitted for brevity.
Further, it should be understood that one or more of the following methods or aspects thereof may be performed by at least one control unit or controller. The term "control unit", "controller", "control module" or "main control module" may refer to a hardware device including a memory and a processor, and the term "air conditioner" may refer to a device similar to an air conditioner. The memory or computer-readable storage medium is configured to store program instructions, while the processor is specifically configured to execute the program instructions to perform one or more processes that will be described further below. Moreover, it is to be appreciated that the following methods may be performed by including a processor in conjunction with one or more other components, as will be appreciated by one of ordinary skill in the art.
The scheme of the invention provides a self-cleaning technology of an inner side heat exchanger of an air conditioner, in particular to a self-cleaning technology of a single-cooling single-motor integrated air conditioner, which enables the inner side heat exchanger (for the single-cooling single-motor integrated air conditioner, an evaporator) to quickly dew (frost) in a self-cleaning mode from the control method, and then the dust embedded on fins is pushed out by multiple groups of periodic positive and negative rotating pulses of a motor, so that the reverse wedge dust removal is realized, the frosting of the inner side heat exchanger is finished, the motor rotates reversely, and simultaneously the electric heating defrosting and defrosting are started to melt water to take away the dust and impurities on the fins, and the self-cleaning function of a window machine is realized.
According to one or more embodiments of the present invention, the present invention provides a self-cleaning mode of an integrated single-cooling air conditioner for cleaning an indoor-side heat exchanger of the air conditioner. Compared with a self-cleaning mode which is easy to realize by a double-motor air conditioner, the self-cleaning air conditioner solves the problem that a single-motor single-cold machine of an integral air conditioner cannot realize self cleaning. The ultra-low rotating speed of the motor with different temperature areas is set by the outer ring temperature subarea to realize the rapid dewing (frost) of the indoor side heat exchanger, the electric heating component (or the electric heating supporting bracket with the electric heating function, the electric heater, the temperature limiter and the like) is arranged between the indoor side heat exchanger and the fan blade, the airflow in the air duct reversely passes through the electric heating and the indoor side heat exchanger by the reverse rotation of the motor to bring the heat of the electric heating to the frosted indoor side heat exchanger, so that the indoor side heat exchanger is rapidly heated, the purposes of taking away the dust and drying the air duct by the defrosting and the melting water of the indoor side heat exchanger of the integral single-cooler are realized, the periodic forward and reverse rotation of the motor activates the defrosting water or the condensing water of each layer in the thickness direction of the indoor side heat exchanger to wash the fins back and forth, the fins are cleaned, the dust entering the gaps of the fins is ejected by the periodic reverse airflow, the frosting and the dust locking are more favorable for the defrosting and the melting water to take away the dust, the self-cleaning function of the indoor heat exchanger is realized, and the dust on the outdoor condenser fins is loosened and separated from the fins under the periodic positive and negative rotating airflow action of the motor, and is taken away by the airflow, so that the self-cleaning function of the outdoor heat exchanger is realized.
The invention is simple and easy to implement, and the used method can enable a single-cold machine to realize quick defrosting self-cleaning of an indoor side heat exchanger, and the specific method is that an electric heating assembly is additionally arranged between a fan blade in an air duct and the indoor side heat exchanger of the single-cold machine, an integrated motor is changed into a reversible motor, after the indoor side heat exchanger is frosted, the motor is reversed, air flow in the air duct reversely passes through the electric heating and the indoor side heat exchanger, heat of the electric heating is brought to the frosted indoor side heat exchanger, the temperature of the indoor side heat exchanger is quickly raised, and the purposes of quickly defrosting, melting water, bringing dust and drying the air duct by the indoor side heat exchanger are realized. The electric heating assembly is used in a self-cleaning mode, and can be used for realizing pure electric heating when the motor rotates forwards, so that the single-cold machine is increased in heating modes, and the heating requirements of tropical regions are met.
The frosting method of the indoor side heat exchanger of the invention is different from the self-cleaning treatment measures of the common air conditioner: the indoor heat exchanger frosts only through the operation of conventional low wind shelves, and under some operating modes, ordinary low wind shelves operation, indoor heat exchanger can not frosted all the time, for example condensation operating mode, higher temperature operating mode. The invention operates through ultra-low wind gear, cooperates with deflection of the air deflector of the indoor air outlet, etc., to make the indoor air output reduce rapidly, thus make the air quantity through the indoor heat exchanger reduce, the heat exchange of the indoor heat exchanger worsens, the indoor heat exchanger cools down rapidly, the air through the indoor heat exchanger is lower than the dew point temperature rapidly and separates out the moisture, the indoor heat exchanger temperature is lower than 0 deg.C or lower rapidly after cooling down a period of time, the condensation turns into the frost rapidly and locks the dust, and then the electric heating heats the frost melt and takes away the dust, realize the self-cleaning.
The invention uses a direct current motor capable of rotating forward and backward, the ultralow wind gear of the direct current motor is not fixed, each temperature zone is verified according to the reliability of the whole machine, and the lowest allowable rotating speed P is setminThe higher the outdoor temperature zone, PminThe higher the initial ultralow rotation speed is, the recommended initial ultralow rotation speed is about 1/3 to 2/3 of the normal low windshield rotation speed, the rotation speed can be further reduced according to the frosting speed so as to accelerate frosting, namely, the temperature of the inner pipe and the temperature of the outer ring are detected at regular time, and when the temperature of the inner pipe is more than 0 ℃ (or T frosting), the rotation speed is reduced, but the lowest rotation speed cannot exceed the lowest rotation speed allowed by each outer ring temperature zone, so that the phenomenon that the rotation speed of a motor is too low, the outdoor heat exchange is poor, and the compressor is damaged due to overload operation of the whole machine is avoided. Meanwhile, the ultra-low wind speed is adjusted in place in different times, all parts of the indoor side heat exchanger frosts at a constant speed under each working condition of the purpose, the problem that after the parts are lowered to the lowest rotating speed at one time is solved, the U pipe part in the middle of the lowest indoor side heat exchanger is rapidly frozen to block a wind channel and isolate air, no wind passes through the indoor side heat exchanger again, the indoor side heat exchanger is frosted only in the deep layer, the surface is frostless, and frosting and dust locking on the surface of the indoor side heat exchanger are not facilitated.
According to the scheme of the invention, when the ultra-low wind runs, the temperature of the outer pipe or the temperature of the exhaust pipe needs to be synchronously monitored, as the rotating speed of the motor is reduced, the heat exchange capacity of the indoor and outdoor heat exchangers is simultaneously reduced, the exhaust temperature is gradually increased, the temperature of the condenser is gradually increased, and the temperature is fed back to the compressor, so that the power of the compressor and the temperature of a winding of the compressor can be gradually increased, and the rotating speed is timely increased or the compressor is directly stopped by monitoring the temperature of the outer pipe or the temperature of the exhaust pipe and exceeding the set warning pipe temperature, thereby avoiding the compressor fault caused by overload damage of the whole machine.
In the solution of the present invention, the temperature of the outer tube needs to be determined in combination with the placement position of the outer tube, and may be any value or set of values within the range of 50-70 degrees, if the latter alarm temperature is set in steps, such as the alarm temperature 1,2,3 … of the outer tube, the alarm temperature of the exhaust tube is generally any value or set of values between 105 and 120 degrees, if the latter alarm temperature is set in steps, such as the alarm temperature 1,2,3 … of the exhaust tube.
According to the scheme of the invention, in addition to simple self-cleaning of dust carried away by frosting, dust locking and defrosting water, the fins are washed back and forth by activating each layer of defrosting water or condensed water in the thickness direction of the indoor side heat exchanger through the periodical positive and negative rotation of the motor, the fins are cleaned, and the dust embedded in the gaps of the fins is ejected out through reverse airflow, so that the dust carried away by frosting, dust locking and defrosting water is facilitated, namely, the reverse wedge pulsating dust removal function is realized.
FIG. 1 is a schematic diagram of reverse wedge dusting in accordance with an exemplary embodiment of the present invention.
As shown in FIG. 1, the fins are first and the dust is second. When the heat exchanger is positively rotated, dust is blocked by the heat exchanger fins along with air inlet, smaller dust is gathered into larger dust and then is plugged into gaps of the fins like wedges, and if the air flow is normally positively rotated, the part of dust is plugged more and more tightly and cannot be blown away; according to the invention, through the reverse rotation of the motor, the dust in the fin gaps is loosened and finally ejected out under the action of the reverse airflow, and meanwhile, the periodic forward and reverse airflow is similar to a wedge which is loosened by shaking, so that the dust is more easily loosened and ejected out.
Fig. 2 is a block diagram of a heat exchanger system according to an exemplary embodiment of the present invention.
As shown in fig. 2, wherein the various components in the system are: 1. the air conditioner comprises an indoor heat exchanger, 2 electric heating components, 3 indoor fan blades, 4 direct current motors capable of rotating positively and negatively, 5 outdoor fan blades, 6 outdoor partition plates, 7 outdoor heat exchangers, 8 indoor partition plates, 9 compressors, 10 indoor air ducts and other parts.
FIG. 3 is a schematic view of frosting/dew flow direction and motor operation direction according to an exemplary embodiment of the present invention. As shown in fig. 3, the direction of the indoor airflow when the motor normally works and operates in the forward direction is as follows: the motor corotation, the air current passes through air inlet panel, indoor side heat exchanger 1, electric heating 2, indoor baffle 8, under the drive of fan blade 3, blows off to the indoor space through indoor wind channel 10 and air outlet wind-guiding blade, realizes normal refrigeration air supply function.
FIG. 4 is a schematic view of defrosting, dedusting airflow direction and motor operation direction according to an exemplary embodiment of the present invention.
As shown in fig. 4, the process of starting electric heating and heating the indoor heat exchanger for defrosting or drying is as follows: the motor reverses, and the electric heating operation is started synchronously, and at the moment, the indoor air is driven by the (centrifugal) fan blade 3 to pass through the indoor partition plate 8, the electric heater 2, the indoor side heat exchanger 1 and the panel from the air outlet guide blade and the indoor air duct 10 and finally blown out through the air inlet panel.
Fig. 5 is a flowchart of a self-cleaning method of an indoor side heat exchanger of an air conditioner according to an exemplary embodiment of the present invention.
As shown in fig. 5, S1: the method comprises the steps that a self-cleaning mode is entered under the refrigeration operation of an air conditioner, the temperature of an inner pipe of an indoor side heat exchanger, the temperature of an outdoor environment, the temperature of an outer pipe of the outdoor side heat exchanger and the temperature of an exhaust pipe are detected, and the frosting of the indoor side heat exchanger is realized by adjusting the rotating speed of a motor and the deflection angle of a wind guide blade;
s2: stopping the indoor heat exchanger from frosting when a preset condition is met, reversing the motor, driving the air guide blades forwards, and starting heating to heat the indoor heat exchanger to realize defrosting of the indoor heat exchanger; the temperature of an inner pipe of the indoor side heat exchanger is less than or equal to zero and lasts for a first preset time.
S3: when the temperature of the inner pipe of the indoor side heat exchanger is larger than the preset temperature threshold value or the continuous frosting time of the indoor side heat exchanger reaches the preset time, continuing to execute the steps S1 and S2;
s4: and when the steps S1 and S2 are periodically executed and reach the preset times, stopping the work of the compressor, reversing the motor of the air conditioner fan, starting electric heating, and exiting the self-cleaning mode when the temperature of the inner pipe of the indoor side heat exchanger is higher than the preset drying temperature.
Fig. 6 is a flowchart of a self-cleaning method of an indoor side heat exchanger of an air conditioner according to an exemplary embodiment of the present invention.
In fig. 6, when the air conditioner operates in the non-self-cleaning mode, the motor rotates forward, the rotation speed of the motor is the rotation speed required by the conventional mode, such as high/medium/low gear, when the user selects to enter the self-cleaning mode through the display panel or the remote controller, the compressor is turned on, the complete machine controller controls the deflection of the air guide blades of the indoor air outlet to reduce the indoor air outlet, at this time, the indoor air passes through the air inlet panel, the indoor side heat exchanger 1, the electric heater 2 and the indoor partition plate 8, and is blown out through the indoor air duct 10 and the air guide blades of the air outlet under the driving of the centrifugal fan blade 3, and the initial rotation speed of the motor is set to be the initial ultralow wind gear PUltra low of 0，PUltra low of 0Between 1/3 and 2/3 of common low windshield, and the rotating speed is higher than the lowest allowable rotating speed P of each temperature zonemin. The conventional wind-guiding blade of low fan rotational speed cooperation air outlet deflects, reduces indoor air output to reduce indoor side heat exchanger heat transfer, accelerate the cooling of indoor side heat exchanger, thereby accelerate indoor side heat exchanger dewfall (frost) speed.
The whole machine is provided with an inner pipe temperature on the elbow of the indoor heat exchanger, an outer ring temperature on the outdoor side, an outer pipe temperature on the outdoor heat exchanger, and/or an exhaust temperature sensing bulb on the exhaust pipe, and the controller synchronously detects the inner pipe temperature T through the temperature sensing bulbsInner pipeAnd outer ring temperature TOuter ringTemperature T of outer tubeOuter tubeAndor exhaust pipe temperature TExhaust of gases. The method is characterized in that the time length of each outer ring at the temperature is 5-20 minutes (the reliability of the whole machine is not needed to be considered for a long time, the running time at the ultra-low rotating speed cannot be too long, the self-cleaning mode is too long, the user experience is poor, the problem of poor heat exchange of the machine is easily caused), the reliability of the whole machine is not a problem, the lowest allowable motor rotating speed P of the motor is set by the outer ring temperature partitionsmin1，Pmin2，Pmin3.., it is proposed to set 3 and more temperature zones, covering (ultra high)/high/(higher)/medium/low/(ultra low) temperature zones, with high/medium/low temperature zones being set as an example, as shown in table 1 below.
TABLE 1
If t lasts2Minute detection of TInner pipeWhen the temperature is less than or equal to 0 ℃, the frosting is finished for the first time, the controller sends an instruction to stop the compressor, the indoor air guide blade is corrected, the motor is reversely rotated at a high speed, the electric heating operation is synchronously started, the indoor air is guided from the air outlet air guide blade at the moment, the indoor air duct 10 is driven by the centrifugal fan blade 3 to pass through the indoor partition plate 8, the electric heating 2, the indoor side heat exchanger 1 and the panel are blown out through the air inlet panel, and when the temperature of the inner tube on the indoor side heat exchanger is TInner pipeNot less than 10 deg.C (or other values, such as any of 5-40 deg.C), or continuous defrosting tDefrosting maxAnd (3) quitting defrosting, comparing the controller with a preset defrosting/defrosting period N, and if the cycle number is less than N (recommended 2-10 times), continuing the defrosting/defrosting process: when the power is cut off, the compressor is started, and the motor is in initial ultra-low rotating speed PUltra low of 0When defrosting is finished at a certain time, the controller detects that the cycle number reaches N, the compressor is stopped, the motor rotates reversely, the electric heating is kept on, and when the temperature T of the inner tube of the indoor side heat exchanger is reachedInner pipe≥TDrying by bakingWhile exiting self-cleaning, TDrying by bakingThe temperature is recommended to be 40 ℃ to 60 ℃. And when the frosting, defrosting and dedusting process is finished once, the controller accumulates 1 cycle number, and simultaneously, the controller compares the preset total cycle number N once, so that self-cleaning is quitted when the preset cycle number N is reached, and the frosting, defrosting and dedusting process is continued when the preset cycle number N is not reached.
When entering the self-cleaning mode, if the initial super-low wind gear P is pressedUltra low of 0Operation t1After minutes, the temperature T of the inner tube is continuously detectedInner pipe>0 ℃ and the motor rotates positively at the momentUltra-lowIs greater than the lowest allowable motor speed P at the corresponding outer ring temperatureminAnd then T is presentOuter tube<TWarning value of outer tubeAndor TExhaust of gases<TExhaust warning valueEvery tSpacerReducing the rotation speed delta P of the motor in minutes to accelerate the knotDew (frost) and motor speed is reduced to a certain speed if t lasts2Minute detection of TInner pipeWhen the temperature is less than or equal to 0 ℃, finishing frosting, executing a defrosting process according to the description in the previous section, checking the cycle number N after frosting is finished, if the preset number is not reached, continuing to turn on the electric heating defrosting process of the ultralow-speed frosting reversal motor until the preset cycle number is reached, stopping the compressor, reversing the motor, turning on the electric heating, and when the temperature T of the inner tube of the indoor side heat exchanger is less than or equal to 0 ℃, stopping the compressor, and turning on the electric heatingInner pipe≥TDrying by bakingAnd when the self-cleaning is finished, the self-cleaning is stopped.
After entering the self-cleaning mode, the rotating speed of the motor is reduced to the lowest allowable rotating speed P of the motor under the corresponding outer ringminOr not reduced to the lowest speed, but T is detectedOuter tube≥TWarning value of outer tubeAndor TExhaust of gases≥TThe exhaust gas warning value is set according to the exhaust gas warning value,or not reduced to the lowest speed, but the running time is more than the allowed longest frosting time t at the ultra-low speedFrosting maxWhen the frost is not formed, the compressor is stopped, the fan is switched to high-speed reverse rotation, and the operation is carried out for tInverse directionAnd after the time is up, checking the cycle number N, and if the preset number is not up, continuing the initial self-cleaning state: frosting (dew) at ultralow rotation speed, turning on or not turning on an electric heating defrosting self-cleaning motor in a reversing way, stopping a compressor until the preset cycle number is reached, turning back the motor, turning on the electric heating, and when the temperature T of an inner pipe of the indoor side heat exchanger is measuredInner pipe≥TDrying by bakingAnd when the self-cleaning is finished, the self-cleaning is stopped.
In the self-cleaning frosting (dew) process, when the air conditioner runs in ultra-low wind, the rotating speed of a motor is reduced, the heat exchange capacity of the indoor heat exchanger and the outdoor heat exchanger is simultaneously reduced, the exhaust temperature is gradually increased, the temperature of a condenser is gradually increased and fed back to the compressor, and the power of the compressor and the temperature of a winding of the compressor can be gradually increased, so that the compressor overload protection is possible to break down in the long-term ultra-low wind speed refrigeration operation, or the winding of the compressor is directly burnt out, and the problem is avoided by effective measures. T mentioned hereWarning value of outer tubeAndor TThe exhaust gas warning value is set according to the exhaust gas warning value,in order to meet the requirement of 5-20min duration under each outer ring temperature, the compressor cannot generate overload protection, and the temperature of the winding of the compressor has a value determined by enough safety margin.
According to one or more embodiments of the invention, the self-cleaning working principle of the prior art is mostly that the heat exchanger frosts, and then the heat pump heats, defrosts and melts water to take away dust, so as to realize the self-cleaning of the heat exchanger, and the invention also discloses another reverse-wedge pulse dust removal self-cleaning mode: the method is characterized in that the motor is arranged to periodically rotate forward and backward (for example, the operation mode in fig. 3 is motor forward rotation, the operation mode in fig. 4 is motor reverse rotation, the motor and the fin are periodically operated), each layer of defrosting water or condensed water in the thickness direction of the indoor side heat exchanger is activated to wash the fin back and forth, the fin is cleaned, and the dust embedded into the gap of the fin is ejected out through periodic reverse airflow, as shown in fig. 1, the dust is loosened or separated from the surface of the fin under the action of airflow reverse force, the loosened/separated dust is more favorable for frosting and locking the dust when frosting is formed on the surface of the indoor side heat exchanger, the dust is taken away by defrosting and defrosting water, if the dust is loosened without reverse force, only by frosting and defrosting water, and very tight dust embedded between the fins is difficult to take away completely. Similarly, under the periodic positive and negative rotating airflow action of the motor, the dust on the outdoor condenser fins is loosened and separated from the fins and taken away by the airflow, so that the self-cleaning effect of the outdoor heat exchanger is realized.
According to one or more embodiments of the present invention, there is also provided a self-cleaning apparatus of an indoor side heat exchanger of an air conditioner, including, a storage and a processor; the memory is used for storing a computer program; the processor is configured to implement the above-mentioned method when executing the computer program.
According to one or more embodiments of the invention, the invention also provides an air conditioner which adopts the method or comprises the device.
According to one or more embodiments of the invention, from the viewpoint of cost reduction, the ultra-low rotating speed P is respectively set according to each outdoor temperature zonemin1It can also be changed into that only one allowed ultra-low rotating speed is set, and the whole machine can be operated according to the unique ultra-low gear under various working conditions, and its reliability is not existedAnd therefore, an outdoor environment temperature device can be eliminated.
According to one or more embodiments of the invention, a reversible direct current motor can be changed into a reversible alternating current tap motor, 1-X ultra-low gears are added on the basis of conventional high, medium and low gears, the recommended value of X is 2-5, 1 ultra-low gear, the reliability of the whole machine is not problem when the machine operates under various working conditions according to the ultra-low gears, a plurality of ultra-low gears can correspond to the ultra-low gears allowed by a plurality of temperature zones, or the frosting (dew) speed can be judged to be fast and slow according to the indoor pipe temperature, the machine is set into a step type ultra-low gear, the frosting (dew) speed is fast, and the machine can be operated by using the ultra-low gear with high rotating speed. And (4) if the frosting (dew) is slow, the ultra-low gear rotating speed is adjusted downwards, and the adjusted ultra-low gear rotating speed is required to be more than or equal to the lowest allowable ultra-low gear rotating speed.
In accordance with one or more embodiments of the present invention, the control logic in the method of the present invention may implement the processes of the above-described aspects of the present invention using encoded instructions (e.g., computer and/or machine readable instructions) stored on a non-transitory computer and/or machine readable medium (e.g., a hard disk drive, a flash memory, a read-only memory, an optical disk, a digital versatile disk, a cache, a random-access memory, and/or any other storage device or storage disk) in which information is stored for any period of time (e.g., for extended periods of time, permanent, transitory instances, temporary caches, and/or information caches). As used herein, the term "non-transitory computer-readable medium" is expressly defined to include any type of computer-readable storage device and/or storage disk and to exclude propagating signals and to exclude transmission media.
In accordance with one or more embodiments of the present invention, the control circuitry, (control logic, master control system or control module) of the method or apparatus of the present invention may comprise one or more processors and may also comprise a non-transitory computer readable medium therein. Specifically, a microcontroller MCU may be included in the device or apparatus (a main control system or a control module), which is disposed in the air conditioner, for automatically implementing the operation of the present invention and implementing various functions. A processor for implementing aspects of the present invention may be such as, but not limited to, one or more single-core or multi-core processors. The processor(s) may include any combination of general-purpose processors and special-purpose processors (e.g., graphics processors, application processors, etc.). The processor may be coupled thereto and/or may include a memory/storage device and may be configured to execute instructions stored in the memory/storage device to implement various applications and/or operating systems running on the controller in accordance with the present invention.
The drawings referred to above and the detailed description of the invention, which are exemplary of the invention, serve to explain the invention without limiting the meaning or scope of the invention as described in the claims. Accordingly, modifications may be readily made by those skilled in the art from the foregoing description. Further, those skilled in the art may delete some of the constituent elements described herein without deteriorating the performance, or may add other constituent elements to improve the performance. Further, the order of the steps of the methods described herein may be varied by one skilled in the art depending on the environment of the process or apparatus. Therefore, the scope of the present invention should be determined not by the embodiments described above but by the claims and their equivalents.
While the invention has been described in connection with what is presently considered to be practical embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (12)
1. A self-cleaning method of an indoor side heat exchanger of an air conditioner includes:
s1: the method comprises the following steps of entering a self-cleaning mode under the refrigeration operation of an air conditioner, and realizing frosting of an indoor side heat exchanger by adjusting the rotating speed of a motor and the deflection angle of an air guide blade;
s2: when the indoor side heat exchanger frosts to meet the preset condition, stopping the indoor side heat exchanger frosting, reversing the motor, turning the air guide blade forward, and starting electric heating to heat the indoor side heat exchanger to realize defrosting of the indoor side heat exchanger;
s3: when the temperature of the inner pipe of the indoor side heat exchanger is larger than the preset temperature threshold value or the continuous defrosting time of the indoor side heat exchanger reaches the preset time, continuing to execute the steps S1 and S2;
s4: and when the steps S1 and S2 are periodically executed and reach the preset times, stopping the work of the compressor, reversing the motor of the air conditioner fan, starting electric heating, and exiting the self-cleaning mode when the temperature of the inner pipe of the indoor side heat exchanger is higher than the preset drying temperature.
2. The method of claim 1, the preset condition being: the temperature of an inner pipe of the indoor side heat exchanger is less than or equal to zero and lasts for a first preset time.
3. The method according to claim 1, further comprising in the step S1: and detecting the temperature of the inner pipe of the indoor side heat exchanger, the temperature of the outdoor environment, the temperature of the outer pipe of the outdoor side heat exchanger and the temperature of the exhaust pipe.
4. The method according to claim 1, wherein the step S1 further comprises, after the preset second time, if the temperature of the inner tube of the indoor side heat exchanger is greater than zero and the rotation speed of the motor is greater than the preset first low rotation speed, decreasing the rotation speed of the motor every predetermined period of time.
5. The method of claim 4, the step S2 further comprising: the preset conditions are as follows: when the rotating speed of the motor reaches a preset first low rotating speed, or the temperature of the outer pipe of the outdoor heat exchanger is greater than or equal to the warning value of the temperature of the outer pipe of the outdoor heat exchanger and/or the temperature of the exhaust pipe is greater than or equal to the warning value of the temperature of the exhaust pipe, or the continuous defrosting time reaches a preset time, if the temperature of the inner pipe of the indoor heat exchanger is still greater than zero degree; when the preset condition is met, the frosting of the indoor side heat exchanger is stopped, the motor is reversely rotated and runs for a third preset time to realize the self-cleaning of the indoor side heat exchanger.
6. The method of claim 4, wherein the first low rotation speed is a preset minimum allowable rotation speed of the motor in each outer ring temperature partition, and the minimum allowable rotation speeds of the temperature zones are different.
7. The method of claim 4, wherein in the step S1, the motor speed is adjusted to between 1/3 and 2/3 of the normal refrigerated low windshield speed.
8. The method according to claim 1, wherein the preset temperature threshold is any value of 5-40 ℃, and the drying temperature ranges from 40 ℃ to 60 ℃.
9. The method of claim 1, wherein a time period from entering the self-cleaning mode to exiting the self-cleaning mode is between 5 minutes and 20 minutes.
10. A self-cleaning device of an indoor side heat exchanger of an air conditioner comprises a storage and a processor;
the memory is used for storing a computer program;
the processor, when executing the computer program, for implementing the method according to any of claims 1-9.
11. An air conditioner employing the method according to any one of claims 1-9 or comprising the apparatus according to claim 10.
12. The air conditioner as claimed in claim 11, which is a single cooling and single motor unitary air conditioner, and the indoor side heat exchanger is an evaporator.
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