CN110822621A - Self-cleaning control method for air conditioner - Google Patents
Self-cleaning control method for air conditioner Download PDFInfo
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- CN110822621A CN110822621A CN201810920710.4A CN201810920710A CN110822621A CN 110822621 A CN110822621 A CN 110822621A CN 201810920710 A CN201810920710 A CN 201810920710A CN 110822621 A CN110822621 A CN 110822621A
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- 238000004140 cleaning Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 76
- 239000003507 refrigerant Substances 0.000 claims abstract description 100
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 230000000694 effects Effects 0.000 abstract description 12
- 238000011010 flushing procedure Methods 0.000 abstract description 12
- 238000001816 cooling Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000011089 carbon dioxide Nutrition 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 239000010721 machine oil Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 206010024796 Logorrhoea Diseases 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/22—Cleaning ducts or apparatus
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Abstract
The invention relates to a self-cleaning control method for an air conditioner. In the technical scheme of the invention, the air conditioner comprises a pulse vibration device arranged on an indoor heat exchanger, the indoor heat exchanger capable of forming a closed-loop refrigerant circulating system, an outdoor heat exchanger, a compressor, an electronic expansion valve and a four-way valve, and the self-cleaning control method comprises the following steps: under the heating condition, the compressor is used for reducing the frequency and the four-way valve is used for reversing; closing the electronic expansion valve, and closing the electromagnetic valve at the low-pressure side of the compressor after a preset time; starting a pulse vibration device to crush dirt inside the indoor heat exchanger; and opening the electronic expansion valve to a preset opening degree, and opening the electromagnetic valve to increase the frequency of the compressor, so that the refrigerant is utilized to flush the crushed dirt in the indoor heat exchanger. The invention can strongly clean the interior of the indoor heat exchanger by using a mode of firstly vibrating and then flushing, so that the dirt adhered to the interior of the indoor heat exchanger can be quickly and thoroughly removed, and the cleaning efficiency and the cleaning effect of the indoor heat exchanger are ensured.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a self-cleaning control method for an air conditioner.
Background
Generally, the refrigerant circulating system of an air conditioner mainly includes a refrigerant and a refrigerating machine oil. After the air conditioner runs for a long time, residual liquid of the refrigerating machine oil, dust and impurities entering the air conditioner are easily adhered to the inner wall of the heat exchanger of the air conditioner, heat exchange between a refrigerant in the heat exchanger and outside air is influenced, heat exchange efficiency is reduced, and the inner wall of the heat exchanger is possibly abraded by the impurities when the refrigerant flows.
At present, except for a manual cleaning method, the self-cleaning mode of the air conditioner is as follows: the dirt on the position to be cleaned of the air conditioner is firstly condensed, specifically, the dirt can be condensed by means of defrosting on the position to be cleaned or spraying dry ice on the position to be cleaned, and then the dirt is peeled off from the position to be cleaned through means of defrosting or sublimation of the dry ice, so that the cleaning purpose is achieved. The disadvantages of the above cleaning methods are: the cleaning method is not suitable for cleaning the inner wall of the heat exchanger, and the cleaning method has poor effect on peeling off the dirt with strong adhesive force, and the air conditioner may have dirt residue after cleaning.
Accordingly, there is a need in the art for a new self-cleaning control method for an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the self-cleaning control method of the existing air conditioner is not well suitable for cleaning the inner wall of the heat exchanger and is difficult to completely strip the stubborn dirt in the air conditioner, the invention provides a self-cleaning control method for the air conditioner, the air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger, a compressor, an electronic expansion valve and a four-way valve, the indoor heat exchanger, the electronic expansion valve, the outdoor heat exchanger, the compressor and the four-way valve form a closed-loop refrigerant circulation system, the air conditioner further comprises a pulse vibration device arranged on the indoor heat exchanger, and the self-cleaning control method comprises the following steps: under the heating condition, the compressor is subjected to frequency reduction, and the four-way valve is reversed; closing the electronic expansion valve, and closing the electromagnetic valve at the low-pressure side of the compressor after a preset time; turning on the pulse vibration device to crush dirt inside the indoor heat exchanger; and opening the electronic expansion valve to a preset opening degree, and opening the electromagnetic valve to increase the rotating speed of an outdoor fan of the air conditioner, so that the crushed dirt in the indoor heat exchanger is washed by the refrigerant.
In a preferred technical solution of the above self-cleaning control method for an air conditioner, the preset opening degree is a maximum opening degree of the electronic expansion valve.
In the above preferred technical solution of the self-cleaning control method for an air conditioner, the step of "increasing the rotation speed of the outdoor fan of the air conditioner" specifically includes: and gradually increasing the rotating speed of an outdoor fan of the air conditioner to the maximum rotating speed.
In a preferred embodiment of the above-mentioned self-cleaning control method for an air conditioner, the step of "opening the electronic expansion valve to a preset opening degree", the step of "opening the solenoid valve", and the step of "increasing the rotation speed of the outdoor fan of the air conditioner" are performed simultaneously.
In the above preferred embodiment of the self-cleaning control method for an air conditioner, the self-cleaning control method further includes, while "closing the solenoid valve on the low-pressure side of the compressor": the compressor is stopped.
In a preferred embodiment of the above self-cleaning control method for an air conditioner, the self-cleaning control method further includes, while "opening the electronic expansion valve to a preset opening degree": and turning off the pulse vibration device.
In the above-described preferred embodiment of the self-cleaning control method for an air conditioner, after the step of "closing the solenoid valve on the low pressure side of the compressor" and before the step of "opening the electronic expansion valve to a preset opening degree", the self-cleaning control method further includes: and reversing the four-way valve.
In a preferred embodiment of the above self-cleaning control method for an air conditioner, the self-cleaning control method further includes, while "opening the electronic expansion valve to a preset opening degree": up-converting the compressor.
In a preferred embodiment of the above self-cleaning control method for an air conditioner, the step of "raising the frequency of the compressor" specifically includes: gradually increasing the frequency of the compressor to a maximum frequency.
In a preferred embodiment of the above self-cleaning control method for an air conditioner, the self-cleaning control method further includes, while "raising the frequency of the compressor": and reversing the four-way valve before the frequency of the compressor is increased to a preset frequency.
As can be understood by those skilled in the art, in the technical solution of the present invention, under a normal heating condition, the compressor is down-converted to reverse the four-way valve, so that the refrigerant flows along a flow path under a cooling condition, that is, the refrigerant circularly flows along a path of the indoor heat exchanger-the solenoid valve on the low pressure side of the compressor-the outdoor heat exchanger-the electronic expansion valve. At the moment, the electronic expansion valve is closed, the electromagnetic valve on the low-pressure side of the compressor is closed after the preset time, all the refrigerants can be recycled to the outdoor side of the air conditioner, so that the refrigerants at the position of the indoor heat exchanger are emptied, the interference of the refrigerants in the indoor heat exchanger on the cleaning work of the indoor heat exchanger is avoided, and the preparation work is prepared for cleaning the indoor heat exchanger. Then, the mode through opening the pulse vibration device exerts vibration stress to indoor heat exchanger for dirt such as the greasy dirt plaque that glues on the indoor heat exchanger, impurity is shaken loose or falls. And finally, opening the electronic expansion valve and the electromagnetic valve and increasing the rotating speed of an outdoor fan of the air conditioner, so that the refrigerant on the outdoor side can flow to the indoor side, the crushed dirt in the indoor heat exchanger is washed by the flowing of the refrigerant, and the dirt shaken off or loosened in the indoor heat exchanger is washed and taken out of the indoor heat exchanger. Compared with the existing cleaning mode of condensation and peeling, the vibration mode can separate stubborn impurities adhered to the inner wall of the indoor heat exchanger from the inner wall more easily, and particularly when the inside of the heat exchanger is cleaned, part of vibration-loosened dirt which does not vibrate is further washed by utilizing impact force acting on the inner wall of the indoor heat exchanger when a refrigerant flows, so that the dirt remained in the inside of the indoor heat exchanger and adhered to the inner wall of the indoor heat exchanger can be thoroughly removed, and a good cleaning effect is ensured.
In a preferred embodiment, the electronic expansion valve is opened to the maximum opening degree, so that a large amount of refrigerant can flow into the indoor heat exchanger from the outdoor side, the inner wall of the indoor heat exchanger can be cleaned and washed away by the refrigerant in the process of flowing through the indoor heat exchanger, stubborn dirt can be washed away, the process of washing away the dirt is accelerated, and the overall cleaning efficiency and cleaning effect are ensured.
In a preferred embodiment, the rotation speed of the outdoor fan of the air conditioner is gradually increased to the maximum rotation speed, that is, when the refrigerant flows to the indoor side to flush the indoor heat exchanger, the outdoor fan operates at the maximum rotation speed, so as to accelerate the heat exchange efficiency of the outdoor heat exchanger and the state conversion process of the refrigerant in the outdoor heat exchanger, thereby further increasing the refrigerant flow and improving the impact force of the refrigerant on the inner wall of the indoor heat exchanger.
Drawings
Fig. 1 is a schematic view of a first structure of an air conditioner of the present invention, in which a refrigerant flow path of the air conditioner is shown under a heating condition;
FIG. 2 is a second structural diagram of the air conditioner of the present invention, wherein the refrigerant flow path of the air conditioner is shown under the cooling condition;
fig. 3 is a flowchart of a self-cleaning control method of an air conditioner of the present invention;
fig. 4 is a logic control diagram of an embodiment of a self-cleaning control method of an air conditioner of the present invention.
Detailed Description
It should be noted that although the steps of the control method of the present invention are described in a particular order in the present application, the order is not limiting and those skilled in the art can perform the steps in a different order without departing from the basic principles of the present invention.
It should be noted that the terms "first" and "second" in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Based on the problems that the prior self-cleaning control method of the air conditioner pointed out by the background technology cannot be well suitable for cleaning the inner wall of the heat exchanger and is difficult to completely strip stubborn dirt in the air conditioner, the invention provides the self-cleaning control method for the air conditioner, and aims to quickly and completely clean the dirt in the indoor heat exchanger and ensure the cleaning effect in the indoor heat exchanger.
Referring first to fig. 1 and 2, fig. 1 is a first structural diagram of an air conditioner according to the present invention, in which a refrigerant flow path is shown in a heating operation. Fig. 2 is a second structural diagram of the air conditioner of the present invention, in which the refrigerant flow path under the cooling condition is shown. As shown in fig. 1 and 2, the air conditioner of the present invention includes an indoor heat exchanger 1, an outdoor heat exchanger 2, a compressor 3, an electronic expansion valve 4, and a four-way valve 5, wherein the indoor heat exchanger 1, the electronic expansion valve 4, the outdoor heat exchanger 2, the compressor 3, and the four-way valve 5 form a closed-loop refrigerant circulation system, the four-way valve 5 is configured to change an operation condition of the air conditioner by reversing, that is, the air conditioner can be changed into a heating condition by reversing the four-way valve 5 under a cooling condition, and the air conditioner can be changed into a cooling condition by reversing the four-way valve. A first solenoid valve 31 is provided on a low pressure side of the compressor 3, and a second solenoid valve 32 is provided on a high pressure side of the compressor 3, so as to control on/off of a refrigerant suction path and a refrigerant discharge path of the compressor 3. The air conditioner of the invention also comprises a pulse vibration device 6 arranged on the indoor heat exchanger 1, and the pulse vibrator 6 can apply vibration stress on the indoor heat exchanger 1 so as to shake off and loosen dirt on the inner wall of the indoor heat exchanger 1 and shake up the agglomerated dirt in the indoor heat exchanger 1.
Referring next to fig. 3 with continued reference to fig. 1 and 2, fig. 3 is a flowchart of a self-cleaning control method of an air conditioner according to the present invention. As shown in fig. 1, 2 and 3, the self-cleaning control method of the present invention comprises the following main steps:
s1: under the heating condition, the compressor 3 is subjected to frequency reduction, and the four-way valve 5 is reversed;
s2: closing the electronic expansion valve 4, and closing the first electromagnetic valve 31 at the low-pressure side of the compressor 3 after a preset time;
s3: starting the pulse vibration device 6 to crush dirt inside the indoor heat exchanger 1;
s4: the electronic expansion valve 4 is opened to a predetermined opening degree, and the first solenoid valve 31 is opened to increase the rotation speed of the outdoor fan 21 at the position of the outdoor heat exchanger 2, thereby flushing the crushed dirt inside the indoor heat exchanger 1 with the refrigerant.
In step S1, as shown in fig. 1, in the heating condition, the refrigerant flows in the clockwise direction, and at this time, the first solenoid valve 31 on the low pressure side of the compressor 3 is a solenoid valve located on the right side of the compressor 3 in fig. 2, and the second solenoid valve 32 on the high pressure side of the compressor 3 is a solenoid valve located on the left side of the compressor 3 in fig. 2. As shown in fig. 2, after the air conditioner is switched from the heating operation mode to the cooling operation mode, the refrigerant flows in a counterclockwise direction, at this time, the first electromagnetic valve 31 on the low pressure side of the compressor 3 is an electromagnetic valve located on the left side of the compressor 3 in fig. 2, and the second electromagnetic valve 32 on the high pressure side of the compressor 3 is an electromagnetic valve located on the right side of the compressor 3 in fig. 2. Because the normal operating frequency of the compressor is higher when the air conditioner is in the heating working condition, the four-way valve 5 can not be reversed. Therefore, when the air conditioner starts to self-clean, the frequency of the compressor 3 is reduced from the normal operation frequency to the frequency that can allow the four-way valve 5 to change the direction, so that the four-way valve 5 can change the direction of the refrigerant, and the subsequent refrigerant recovery operation is prepared.
In step S2, after the electronic expansion valve 4 is closed, the refrigerant gradually flows to the outdoor side of the air conditioner in the counterclockwise direction, and the closed electronic expansion valve 4 can gradually collect the refrigerant to the outdoor side by preventing the refrigerant flowing to the outdoor side from flowing to the indoor side of the air conditioner. After all the refrigerants flow to the outdoor side uniformly, namely the preset time is reached and the refrigerant recovery is finished, the first electromagnetic valve 31 is closed, so that the refrigerants are separated from the front side and the rear side of the flowing direction to the outdoor side of the air conditioner, and the indoor heat exchanger 1 on the indoor side is prevented from being influenced by the flowing of the refrigerants. As an example, the preset time may be 30 seconds, that is, 30 seconds after the electronic expansion valve 4 is closed, the first electromagnetic valve 31 is closed, so as to ensure that all the refrigerant is recovered to the outdoor side of the air conditioner. It should be noted that the preset time may be any time other than 30 seconds, and those skilled in the art may reasonably set the preset time in practical applications in combination with the operating parameters of the air conditioner, as long as the demarcation point determined by the preset time can ensure that all the refrigerants are recovered to the outdoor side of the air conditioner.
In step S3, after the pulse vibration device 6 is turned on, a vibration stress can be applied to the inner wall of the indoor heat exchanger 1, so as to shake loose or shake down dirt such as oil spots and impurities stuck on the inner wall of the indoor heat exchanger 1, and shake up large dirt stuck in the indoor heat exchanger 1, thereby preventing the dirt from sticking and sticking in the indoor heat exchanger 1.
In step S4, when the electronic expansion valve 4 is opened to the predetermined opening degree and the first solenoid valve 31 is opened, the refrigerant can start to circulate again, and the refrigerant flows from the outdoor side to the indoor side, and flushes the interior of the indoor heat exchanger 1 while flowing through the indoor heat exchanger 1. After the rotating speed of the outdoor fan 21 is increased, the heat exchange efficiency of the outdoor heat exchanger 2 is increased, so that the state conversion (twice reversing, namely evaporation or once reversing, namely condensation, and the following process will be described in detail) efficiency of the refrigerant in the outdoor heat exchanger 2 is increased, a large amount of refrigerant can flow in the pipeline, the indoor heat exchanger 1 is flushed by the flowing of the large amount of refrigerant, and the dirt loosened by vibration is washed away and is brought out of the indoor heat exchanger 1 along with the flowing of the refrigerant together with the dirt broken and vibrated off.
In a preferred embodiment, the preset opening degree is a maximum opening degree of the electronic expansion valve 4. When the self-cleaning process of the indoor heat exchanger 1 enters the flushing stage, the electronic expansion valve 4 is opened to the maximum opening degree to allow the refrigerant to circularly flow, so that a large amount of refrigerant can flow to the indoor side through the electronic expansion valve 4, and the refrigerant can generate a large enough impact force on the interior of the indoor heat exchanger 1 when flowing. Of course, the "large amount" of refrigerant means that the flow rate of the refrigerant is greater than that of the refrigerant under normal refrigeration/thermal conditions, so that the refrigerant can have a good flushing effect in the indoor heat exchanger 1 when flowing.
As another preferred embodiment, the step S4 of "increasing the rotation speed of the outdoor fan 21 of the air conditioner" includes: the rotation speed of the outdoor fan 21 of the air conditioner is gradually increased to the maximum rotation speed. In the process of the refrigerant circulating flow, the outdoor fan 21 operates at the maximum rotation speed, so that the heat exchange between the outdoor heat exchanger 2 and the external environment is completed quickly and efficiently, and the process of refrigerant state conversion is promoted. The gradually increasing the rotation speed of the outdoor fan 21 to the maximum rotation speed may be to increase the rotation speed of the outdoor fan 21 in a linear relationship, or to increase the rotation speed of the outdoor fan 21 in a nonlinear relationship, and those skilled in the art may flexibly set the rotation speed increasing manner of the outdoor fan 21 in practical applications, as long as the rotation speed of the outdoor fan 21 is increased to the maximum rotation speed, so as to promote the rapid refrigerant conversion state in the outdoor heat exchanger 2.
Further, the three substeps of "opening the electronic expansion valve 4 to the preset opening degree", "opening the first solenoid valve 31", and "increasing the rotation speed of the outdoor fan 21 of the air conditioner" in step S4 are performed simultaneously, that is, when the cleaning process of the indoor heat exchanger 1 enters the flushing stage, the electronic expansion valve 4 (opened at the maximum opening degree) and the solenoid valve 31 are opened to circulate the flow path of the refrigerant and increase the rotation speed of the outdoor fan 21 to the maximum rotation speed, so that the flow rate of the refrigerant in the flow path is maximized in a short time, thereby ensuring that the refrigerant can strongly impact and wash the inside of the indoor heat exchanger 1, and not only can the dirt fallen and crushed in the indoor heat exchanger 1 be quickly cleaned up along with the flow of the refrigerant, but also the dirt loosened but not fallen from the inner wall of the indoor heat exchanger 1 can be flushed away, cleaning efficiency is improved and cleaning effect is ensured.
Further, while "closing the first solenoid valve 31 on the low pressure side of the compressor 3", the self-cleaning control method of the present invention further includes: the compressor 3 is stopped. That is, when the refrigerant is completely recovered and the flow path thereof is cut off from the front and rear sides in the flow direction, since the refrigerant does not need to flow circularly in the following vibration and dirt breaking stage, the compressor 3 is stopped to reduce the energy consumption of the air conditioner, and the pressure of the refrigerant to the electronic expansion valve 4 is reduced by stopping the exhaust of the compressor 3, thereby preventing the electronic expansion valve 4 from being unnecessarily worn.
Further, while "opening the electronic expansion valve 4 to a preset opening degree", the self-cleaning control method of the present invention further includes: the pulse vibrating device 6 is switched off. The indoor heat exchanger 1 enters a flushing stage while the electronic expansion valve 4 is opened to flow the refrigerant. Under this situation, because the refrigerant can play certain cushioning effect to the vibration of indoor heat exchanger 1 after getting into indoor heat exchanger 1, be unfavorable for garrulous dirt that shakes, consequently close pulse vibration device 6 this moment, avoided the waste of electric energy on the one hand, on the other hand can avoid the impact force of vibration stress and refrigerant to influence each other again and reduce clean effect. Specifically, after the pulse vibrator 6 is turned on, the pulse vibrator 6 may be operated for a certain period of time to crush dirt in the indoor heat exchanger 1, and the pulse vibrator 6 may be turned off while the refrigerant is circulated again to end the process of vibrating the crushed dust.
As a preferred embodiment, in the case where the operation of the compressor 3 is stopped while the first solenoid valve 31 is closed, after the step of "closing the first solenoid valve 31" and before the step of "opening the electronic expansion valve 4 to the preset opening degree", the self-cleaning control method of the present invention further includes: the four-way valve 5 is reversed. Specifically, since the compressor 3 is stopped after the first solenoid valve 31 is closed, the four-way valve 5 can be switched at any time point during the period before the frequency of the compressor 3 is increased, that is, before the cleaning process of the indoor heat exchanger 1 enters the refrigerant flushing indoor heat exchanger 1. Through the reversing operation again, the refrigerant can flow along the clockwise direction, and the air conditioner is in the heating working condition again. Compared with the situation that the air conditioner recovers to heat after reversing once until the self-cleaning process is completely finished, the embodiment of flushing the indoor heat exchanger 1 by the refrigerant during heating obviously can greatly weaken the adverse effect of the self-cleaning process on the heating of the air conditioner for users, so that the air conditioner can convey hot air to the indoor space in a very short time, and the user experience is ensured.
Still further, while "opening the electronic expansion valve 4 to a preset opening degree", the self-cleaning control method of the present invention further includes: the compressor 3 is upscaled. After the frequency of the compressor 3 is increased, the discharge amount of the refrigerant of the compressor 3 in unit time is increased, so that the amount of the refrigerant flowing into the indoor heat exchanger 1 is increased, a large amount of the refrigerant can flow in the pipeline, and the impact effect of the refrigerant on the indoor heat exchanger 1 is ensured. As a preferred embodiment, the step of "up-converting the compressor 3" specifically comprises: the frequency of the compressor 3 is gradually increased to the highest frequency. That is, when the self-cleaning process of the indoor heat exchanger 1 enters the flushing stage, the compressor 3 is rapidly increased to the maximum frequency in a short time, so that the displacement of the compressor 3 (i.e. the amount of the discharged high-pressure gaseous refrigerant) in unit time is maximized, thereby further ensuring the impact effect of the large-flow refrigerant on the indoor heat exchanger 1. The gradual increase of the frequency of the compressor 3 may be to increase the frequency of the compressor 3 in a linear relationship, or to increase the frequency of the compressor 3 in a non-linear relationship, and those skilled in the art may flexibly set the frequency increasing manner of the compressor 3 in practical applications, as long as the frequency of the compressor 3 is increased to the highest frequency, and then a large amount of refrigerant circulates along the flow path to strongly flush the interior of the indoor heat exchanger 1.
In addition to the above-mentioned reversing of the four-way valve 5 after closing the first solenoid valve 31 and before opening the electronic expansion valve 4 to the preset opening degree, as an alternative preferred embodiment, in the case of raising the frequency of the compressor 3 while opening the electronic expansion valve 4 to the preset opening degree, the self-cleaning control method of the present invention further includes, while "raising the frequency of the compressor 3": the four-way valve 5 is reversed before the frequency of the compressor 3 is raised to a preset frequency. The preset frequency is the maximum frequency that allows the four-way valve 5 to be reversed, that is, once the frequency of the compressor 3 exceeds the preset frequency, the four-way valve 5 cannot be reversed. That is, the four-way valve 5 may be reversed in an early stage of the refrigerant flushing of the indoor heat exchanger 1 within a frequency allowable range of the compressor 3. Because the compressor 3 will be raised to the highest frequency in a short time, the difference between the former stage of flushing the indoor heat exchanger 1 by the refrigerant and the time when the refrigerant starts to flow and flushes the indoor heat exchanger 1 is short, so that the process of recovering the heating operation of the air conditioner as soon as possible is not greatly influenced.
In summary, on the premise that the frequency of the compressor 3 allows, the four-way valve 5 can be switched at any time after the refrigerant is recovered and in the earlier stage when the refrigerant washes the indoor heat exchanger 1, so that the air conditioner can recover the heating mode as soon as possible on the premise that the self-cleaning process is not affected, the cleaning purpose is achieved, the normal work of the air conditioner is hardly affected, and the user experience is improved.
Referring finally to fig. 4 and with continued reference to fig. 1 and 2, the most preferred technical solution of the present invention is explained, and fig. 4 is a logic control diagram of an embodiment of the self-cleaning control method of the air conditioner of the present invention. As shown in fig. 1, 2 and 4, in particular, the complete self-cleaning process is as follows:
under the condition that the air conditioner is in the heating working condition, the outdoor fan 21 rotates at the normal working speed raoIn operation, the indoor fan 11 operates at the normal operating speed rnThe compressor 3 is operated at the normal working frequency f, the electronic expansion valve 4 is in an opening state, and the opening degree is b 1;
when the air conditioner receives the self-cleaning command (i.e., point a in fig. 4) of the indoor heat exchanger 1, the compressor 3 is lowered from the frequency f to the preset frequency f1So that the four-way valve 5 can change the direction, thereby changing the flowing direction of the refrigerant;
after reversing, the compressor 3 is driven from the frequency f1Is raised to a frequency f2Wherein the frequency f2Higher than the normal heating frequency f of the compressor 3 so as to ensure that the refrigerant recovery can be completed quickly. At the same time (or thereafter), the electronic expansion valve 4 is closed to start recovering the refrigerant. The indoor fan 11 and the outdoor fan 21 are both still operated at the normal operating speed under the heating condition, and the compressor 3 is operated at the frequency f2When the air conditioner is operated, the refrigerant flows and gathers to the outdoor side of the air conditioner. After a predetermined time (30 seconds as shown in fig. 3), the refrigerant flows and is collected to the outdoor side, at t1Closing the solenoid valve 31 within a certain time to completely cut off the flow path of the refrigerant and completely recover the refrigerantThe routine ends. Wherein the frequency of the compressor 3 is changed from f while the electromagnetic valve 31 is closed2Gradually decreases to stop and the rotating speed of the outdoor fan 21 is increased from raoGradually decreases to stop so as to reduce the energy consumption of the air conditioner and reduce the pressure of the refrigerant to the electronic expansion valve 4 under the condition that the refrigerant does not need to flow.
Then, the pulse vibration device 6 is turned on to crush the dirt inside the indoor heat exchanger 1, and the pulse vibration device 6 is operated for a period of time to completely crush and shake off the dirt inside the indoor heat exchanger 1, and the operation time of the pulse vibration device 6 may be 3 to 5 minutes, as an example. The specific operation time can be set according to the actual cleaning requirement. In this process, the outdoor fan 21 and the compressor 3 are always in a state of being stopped, and the electronic expansion valve 4 and the electromagnetic valve 31 are always in a closed state. Indoor fan 11 maintains rotational speed rnThe rotation is not changed or stopped;
finally, after the vibration and dirt breaking process is finished, the pulse vibration device 6 is closed, the electronic expansion valve 4 is opened to the maximum opening degree B, the electromagnetic valve 31 is opened, the compressor 3 and the outdoor fan 21 are opened, and the frequency and the rotating speed of the compressor 3 and the outdoor fan 21 are respectively increased to fmaxAnd rao-maxThe refrigerant of a large flow rate circulates again to flow through the indoor heat exchanger 11, and the indoor heat exchanger 11 is washed, so that dirt in the indoor heat exchanger 11 can flow out of the indoor heat exchanger 11 along with the circulation flow of the refrigerant. Wherein the frequency is increased to be higher than the frequency f after the compressor 3 stops operating2Previously, the four-way valve 5 was reversed so that the air conditioner could heat the user while the above-described flushing process was in progress. The rotating speed of the indoor fan 11 can be increased to the maximum rotating speed rn-maxSo as to further promote the circulation flow of a large amount of refrigerant and also to continuously maintain the normal working rotating speed rn. A filtering device is arranged on the indoor heat exchanger 11 or the compressor 3 or between the indoor heat exchanger 11 and the compressor 3, so that the filtering device can filter and collect dirt and impurities in the refrigerant. As an example, the filtering device may be a dust collecting ring disposed at the bottom of the compressor 3. The manner of filtering and collecting the dirt is not limited, and a specific filtering scheme can be adoptedThe air conditioner can be set according to the actual flow pipeline of the air conditioner as long as the dirt in the refrigerant can be collected and the normal operation of the air conditioner is not influenced. The time length of the washing process can be 2-3 minutes, and the actual washing time length can be adjusted according to the cleaning requirement;
after the rinsing is finished, at t2Adjusting the opening degree of the electronic expansion valve from B to B within the time1The frequency of the compressor 3 is set from fmaxReduced to f, the rotating speeds of the indoor fan 11 and the outdoor fan 21 are respectively adjusted to raoAnd rnAnd the air conditioner can recover the normal heating working condition before self-cleaning.
In the above embodiment, since the raising and lowering of the frequencies and the rotational speeds of the compressor 3, the outdoor fan 21, and the indoor fan 11 are not instantaneously completed, it takes time t to complete the raising and lowering work1And t2The time consumed for the actual lifting of the compressor 3, the outdoor fan 21, and the indoor fan 11 is taken as a criterion. And because the lifting action takes a short time, the partial steps can be approximately regarded as being performed simultaneously. For example, if the three steps of "opening the electronic expansion valve 4 to the preset opening degree", "opening the first electromagnetic valve 31", and "increasing the rotation speed of the outdoor fan 21" are performed simultaneously, the three steps are considered to be performed simultaneously although the end times of the three steps after the simultaneous start of the execution are slightly different. The above time difference does not affect the actual operation of the self-cleaning method of the present invention.
Finally, it should be noted that the above examples are all preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. When the present invention is actually used, a part of the steps may be added or deleted as needed or the order between the different steps may be changed by those skilled in the art. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A self-cleaning control method for an air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger, a compressor, an electronic expansion valve and a four-way valve, wherein the indoor heat exchanger, the electronic expansion valve, the outdoor heat exchanger, the compressor and the four-way valve form a closed-loop refrigerant circulating system,
the air conditioner is characterized by further comprising a pulse vibration device arranged on the indoor heat exchanger, and the self-cleaning control method comprises the following steps:
under the heating condition, the compressor is subjected to frequency reduction, and the four-way valve is reversed;
closing the electronic expansion valve, and closing the electromagnetic valve at the low-pressure side of the compressor after a preset time;
turning on the pulse vibration device to crush dirt inside the indoor heat exchanger;
and opening the electronic expansion valve to a preset opening degree, and opening the electromagnetic valve to increase the rotating speed of an outdoor fan of the air conditioner, so that the crushed dirt in the indoor heat exchanger is washed by the refrigerant.
2. The self-cleaning control method of claim 1, wherein the preset opening degree is a maximum opening degree of the electronic expansion valve.
3. The self-cleaning control method according to claim 1, wherein the step of "increasing the rotation speed of the outdoor fan of the air conditioner" specifically comprises:
and gradually increasing the rotating speed of an outdoor fan of the air conditioner to the maximum rotating speed.
4. The self-cleaning control method of claim 1, wherein the steps of "opening the electronic expansion valve to a preset opening degree", "opening the solenoid valve", and "increasing a rotation speed of an outdoor fan of the air conditioner" are performed simultaneously.
5. The self-cleaning control method according to claim 1, wherein, while "closing a solenoid valve at a low pressure side of the compressor", the self-cleaning control method further comprises:
the compressor is stopped.
6. The self-cleaning control method according to claim 1, wherein, while "opening the electronic expansion valve to a preset opening degree", the self-cleaning control method further comprises:
and turning off the pulse vibration device.
7. The self-cleaning control method according to claim 5, wherein after the step of "closing a solenoid valve at a low pressure side of the compressor" and before the step of "opening the electronic expansion valve to a preset opening degree", the self-cleaning control method further comprises:
and reversing the four-way valve.
8. The self-cleaning control method according to any one of claims 1 to 6, wherein, simultaneously with the step of "opening the electronic expansion valve to a preset opening degree", the self-cleaning control method further comprises:
up-converting the compressor.
9. The self-cleaning control method of claim 8, wherein the step of "upshifting the compressor" specifically comprises:
gradually increasing the frequency of the compressor to a maximum frequency.
10. The self-cleaning control method of claim 8, wherein, while "up-clocking" the compressor, the self-cleaning control method further comprises:
and reversing the four-way valve before the frequency of the compressor is increased to a preset frequency.
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| CN201810920710.4A CN110822621A (en) | 2018-08-14 | 2018-08-14 | Self-cleaning control method for air conditioner |
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Cited By (1)
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| CN113483448A (en) * | 2021-07-09 | 2021-10-08 | 青岛海尔空调器有限总公司 | Method for recovering oil stain in pipe of indoor unit |
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Application publication date: 20200221 |