CN110822624A - Self-cleaning control method for air conditioner - Google Patents
Self-cleaning control method for air conditioner Download PDFInfo
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- CN110822624A CN110822624A CN201810920799.4A CN201810920799A CN110822624A CN 110822624 A CN110822624 A CN 110822624A CN 201810920799 A CN201810920799 A CN 201810920799A CN 110822624 A CN110822624 A CN 110822624A
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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
Abstract
In the technical scheme of the invention, the air conditioner comprises a pulse vibration device arranged on an outdoor heat exchanger, an indoor heat exchanger capable of forming a closed-loop refrigerant circulating system, the 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 refrigeration working 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; starting a pulse vibration device to crush dirt inside the outdoor heat exchanger; the electronic expansion valve is opened to a preset opening degree, the electromagnetic valve is opened, the compressor is increased in frequency, the rotating speed of an indoor fan of the air conditioner is increased, and therefore the refrigerant is used for flushing crushed dirt in the outdoor heat exchanger. The invention can strongly clean the interior of the outdoor heat exchanger by using a mode of firstly vibrating and then washing, so that the dirt adhered to the interior of the outdoor heat exchanger can be quickly and thoroughly removed, and the cleaning efficiency and the cleaning effect of the outdoor 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 outdoor heat exchanger, and the self-cleaning control method comprises the following steps: under the refrigeration working 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 outdoor heat exchanger; and opening the electronic expansion valve to a preset opening degree, opening the electromagnetic valve, increasing the frequency of the compressor, and increasing the rotating speed of an indoor fan of the air conditioner, so that the crushed dirt in the outdoor 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 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 the above preferred technical solution of the self-cleaning control method for an air conditioner, "the rotation speed of the air inside and outside fans is gradually increased to the maximum rotation 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", the step of "raising the frequency of the compressor", and the step of "raising the rotation speed of the indoor 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 the above-described preferred embodiment of the self-cleaning control method for an air conditioner, the self-cleaning control method further includes, after the step of "closing the solenoid valve on the low pressure side of the compressor" and before the step of "raising the frequency of the compressor": 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 "raising the frequency of the compressor": and reversing the four-way valve before the frequency of the compressor is increased to a preset frequency.
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 addition, the invention also provides an air conditioner, which comprises a control unit, wherein the control unit is used for executing any one of the self-cleaning control methods for the air conditioner.
As can be understood by those skilled in the art, in the technical solution of the present invention, under a normal refrigeration condition, the compressor is frequency-down to reverse the four-way valve, so that the refrigerant flows along a flow path in a heating condition, that is, the refrigerant circularly flows along a path of the outdoor heat exchanger-the solenoid valve on the low pressure side of the compressor-the indoor heat exchanger-the electronic expansion valve. At the moment, the electronic expansion valve is closed firstly, the electromagnetic valve on the low-pressure side of the compressor is closed after the preset time, so that the refrigerant can be completely recycled to the indoor side of the air conditioner, the refrigerant at the position of the outdoor heat exchanger is emptied, the interference of the refrigerant in the outdoor heat exchanger on the cleaning work of the outdoor heat exchanger is avoided, and the preparation work is prepared for cleaning the outdoor heat exchanger. Then, a vibration stress is applied to the outdoor heat exchanger by starting the pulse vibration device, so that dirt such as greasy dirt patch, impurities and the like adhered to the outdoor heat exchanger is loosened or dropped by vibration. And finally, opening the electronic expansion valve and the electromagnetic valve, raising the frequency of the compressor, and raising the rotating speed of the indoor fan, so that the refrigerant on the indoor side can flow to the outdoor side, the crushed dirt in the outdoor heat exchanger is washed by the flowing of the refrigerant, and the dirt shaken off or loosened in the outdoor heat exchanger is washed and taken out of the outdoor 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 outdoor heat exchanger from the inner wall more easily, and particularly when the inside of the heat exchanger is cleaned, part of loosened dirt which is not vibrated and fallen is further washed by utilizing the impact force acting on the inner wall of the outdoor heat exchanger when a refrigerant flows, so that the dirt remained in the inside of the outdoor heat exchanger and adhered to the inner wall of the outdoor heat exchanger can be thoroughly removed, and a good cleaning effect is ensured.
In a preferred embodiment, make electronic expansion valve open to the maximum aperture to make in a large amount of refrigerants can flow to outdoor heat exchanger from the indoor side, thereby guaranteed that the refrigerant can clear up the inner wall of scouring away outdoor heat exchanger in the in-process of outdoor heat exchanger of flowing through, can scour away clean stubborn dirt and quicken the process of washing away the dirt, guaranteed whole clean efficiency and clean effect.
In a preferred embodiment, the frequency of the compressor is gradually increased to the highest frequency, that is, when the refrigerant flows to the outdoor side to flush the outdoor heat exchanger, the compressor is operated at the highest frequency, so as to increase the refrigerant discharge capacity of the compressor per unit time, thereby further increasing the refrigerant flow rate, and improving the impact force of the refrigerant on the inner wall of the outdoor heat exchanger.
In a preferred embodiment, the rotation speed of the indoor fan of the air conditioner is gradually increased to the maximum rotation speed, that is, when the refrigerant flows to the outdoor side to wash the outdoor heat exchanger, the indoor fan operates at the maximum rotation speed, so as to accelerate the heat exchange efficiency of the indoor heat exchanger and accelerate the state conversion process of the refrigerant in the indoor heat exchanger, thereby further increasing the refrigerant flow and improving the impact force of the refrigerant on the inner wall of the outdoor heat exchanger.
Drawings
Fig. 1 is a schematic diagram of a first structure of an air conditioner according to the present invention, wherein a refrigerant flow path of the air conditioner is shown in a cooling condition;
fig. 2 is a second structural diagram of the air conditioner of the present invention, which shows the refrigerant flow path of the air conditioner under the heating 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 outdoor heat exchanger and ensure the cleaning effect in the outdoor heat exchanger.
Referring first to fig. 1 and 2, fig. 1 is a first structural schematic diagram of an air conditioner according to the present invention, in which a refrigerant flow path is shown under a cooling condition. Fig. 2 is a schematic diagram of a second structure of the air conditioner of the present invention, in which a refrigerant flow path in a heating operation 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 outdoor heat exchanger 2, and the pulse vibrator 6 can apply vibration stress on the outdoor heat exchanger 2 so as to shake off and loosen dirt on the inner wall of the outdoor heat exchanger 2 and shake up the agglomerated dirt in the outdoor heat exchanger 2.
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 refrigeration working 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: the pulse vibration device 6 is turned on to crush dirt inside the outdoor heat exchanger 21;
s4: the electronic expansion valve 4 is opened to a preset opening degree, the first electromagnetic valve 31 is opened, the compressor 3 is increased in frequency, the rotating speed of the indoor fan 11 at the position of the indoor heat exchanger 1 is increased, and therefore the refrigerant is used for flushing crushed dirt in the outdoor heat exchanger 2.
In step S1, as shown in fig. 1, in the cooling mode, the refrigerant flows in a counterclockwise direction, in which case the first solenoid valve 31 on the low pressure side of the compressor 3 is the solenoid valve located on the left side of the compressor 3 in fig. 2, and the second solenoid valve 32 on the high pressure side of the compressor 3 is the solenoid valve located on the right side of the compressor 3 in fig. 2. As shown in fig. 2, after the air conditioner is switched from the cooling operation mode to the heating operation mode, the refrigerant flows in a clockwise 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 right 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 left side of the compressor 3 in fig. 2. Because the normal operating frequency of the compressor is higher when the air conditioner is in a refrigeration working condition, the four-way valve 5 cannot 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 into the indoor side of the air conditioner in the clockwise direction, and the closed electronic expansion valve 4 can gradually recover the refrigerant to the indoor side by preventing the refrigerant flowing into the indoor side from flowing into the outdoor side of the air conditioner. After all the refrigerants flow to the indoor 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 indoor side of the air conditioner, and the outdoor heat exchanger 2 on the outdoor 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 indoor 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 boundary point determined by the preset time can ensure that all the refrigerant is recovered to the indoor 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 outdoor heat exchanger 2, so as to shake loose or shake down dirt such as oil spots and impurities stuck on the inner wall of the outdoor heat exchanger 2, and shake up large dirt stuck in the outdoor heat exchanger 2, so as to prevent the dirt from sticking and sticking in the outdoor heat exchanger 2.
In step S4, when the electronic expansion valve 4 is opened to the preset opening degree and the first solenoid valve 31 is opened, the refrigerant can start to circulate again, and the refrigerant flows from the indoor side to the outdoor side, and flushes the interior of the outdoor heat exchanger 2 while passing through the outdoor heat exchanger 2. 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 outdoor heat exchanger 2 is increased, and after the rotating speed of the indoor fan 11 is increased, the heat exchange efficiency of the indoor heat exchanger 1 is increased, thereby increasing the state conversion (evaporation when the refrigerant is reversed once or condensation when the refrigerant is reversed twice, the detailed process will be described below) efficiency of the refrigerant in the indoor heat exchanger 1, further enabling a large amount of the refrigerant to flow in the pipeline, facilitating strong scouring of the refrigerant in the outdoor heat exchanger 2 through the flow of the refrigerant, and washing out the vibrated loose dirt and bringing the vibrated loose dirt out of the outdoor heat exchanger 2 along with the flow of the refrigerant.
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 outdoor heat exchanger 2 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 outdoor side through the electronic expansion valve 4, and the refrigerant can generate a large enough impact force on the interior of the outdoor heat exchanger 2 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/heating conditions, so that the refrigerant can have a good flushing effect in the exterior heat exchanger 2 when flowing.
As another preferred embodiment, the step S4 of "frequency up-converting the compressor 3" specifically includes: the frequency of the compressor 3 is gradually increased to the highest frequency. That is, when the self-cleaning process of the outdoor heat exchanger 2 enters the flushing stage, the compressor 3 is rapidly increased to the maximum frequency in a short time, so that the refrigerant discharge amount (i.e., the amount of the discharged high-pressure gaseous/liquid refrigerant) of the compressor 3 in a unit time is maximized, thereby further ensuring the impact effect of the large-flow refrigerant on the inside of the outdoor heat exchanger 2. 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 inside of the outdoor heat exchanger 2.
As another preferred embodiment, the "increasing the rotation speed of the indoor fan 11 of the air conditioner" in the step S4 specifically includes: the rotation speed of the indoor fan 11 of the air conditioner is gradually increased to the maximum rotation speed. In the process of the refrigerant circulating flow, the indoor fan 11 operates at the maximum rotation speed, so that the heat exchange between the indoor heat exchanger 1 and the external environment is completed quickly and efficiently, and the process of the refrigerant state conversion is promoted. The gradually increasing the rotation speed of the indoor fan 11 to the maximum rotation speed may be to increase the rotation speed of the indoor fan 11 in a linear relationship, or to increase the rotation speed of the indoor fan 11 in a nonlinear relationship, and those skilled in the art may flexibly set the rotation speed increasing manner of the indoor fan 11 in practical applications, as long as the rotation speed of the indoor fan 121 is increased to the maximum rotation speed, so as to promote the rapid conversion state of the refrigerant in the indoor heat exchanger 1.
Further, the four substeps of "opening the electronic expansion valve 4 to the preset opening degree", "opening the first solenoid valve 31", "raising the frequency of the compressor 3", and "raising the rotation speed of the indoor fan 11" in step S4 are performed simultaneously, that is, when the cleaning process of the outdoor heat exchanger 2 enters the flushing stage, the electronic expansion valve 4 (opened at the maximum opening degree) and the first solenoid valve 31 are opened to circulate the flow path of the refrigerant, the compressor 3 is raised to the maximum frequency, and the rotation speed of the indoor fan 11 is raised 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-wash the inside of the outdoor heat exchanger 2, and the dirt loosened and crushed inside the outdoor heat exchanger 2 can be quickly cleaned up along with the flow of the refrigerant and can be flushed away from the dirt that is loosened but not fallen off from the inner wall of the outdoor heat exchanger 2, 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 both the front and rear sides in the flow direction, since the refrigerant does not need to flow in a circulating manner at the next vibration and dirt breaking stage, the operation of 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 discharge of the refrigerant from the compressor 3, thereby preventing the electronic expansion valve 4 from being unnecessarily worn.
As a preferred embodiment, in the case where the compressor stops operating while the first solenoid valve 31 is closed, after the step of "closing the first solenoid valve 31" and before the step of "up-converting the compressor 3", 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 outdoor heat exchanger 2 enters the refrigerant flushing outdoor heat exchanger 2. Through the reversing operation again, the refrigerant can flow along the anticlockwise direction, and the air conditioner is in the refrigerating working condition again. Compared with the situation that the air conditioner recovers to refrigerate after reversing once until the self-cleaning process is completely finished, the implementation mode of flushing the outdoor heat exchanger 2 by the refrigerant during refrigeration obviously can greatly weaken the adverse effect of the self-cleaning process on the air conditioner during refrigeration for users, so that the air conditioner can convey cold air indoors in a short time, and the user experience is guaranteed.
As an alternative embodiment, in addition to the above-described reversing situation, the self-cleaning control method of the present invention further includes, while "up-converting 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 can be reversed in the early stage of the refrigerant flushing outdoor heat exchanger 2 within the allowable frequency range of the compressor 3. Since the compressor 3 will be raised to the highest frequency within a short time, the difference between the "earlier stage of flushing the outdoor heat exchanger 2 with the refrigerant" and the time when the refrigerant starts to flow and flush the outdoor heat exchanger 2 is short, so that the influence on the process of recovering the refrigeration operation of the air conditioner as soon as possible is little.
In conclusion, 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 early stage when the refrigerant washes the outdoor heat exchanger 2, so that the air conditioner can recover the refrigeration mode as soon as possible on the premise that the self-cleaning process is not influenced, the cleaning purpose is achieved, the normal work of the air conditioner is hardly influenced, and the user experience is improved.
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 pulse vibrating device 6 is switched off. The outdoor heat exchanger 2 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 outdoor heat exchanger 2 after getting into outdoor heat exchanger 2, 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 outdoor heat exchanger 2, and the pulse vibrator 6 may be turned off while the refrigerant is circulated again to finish the process of vibrating the crushed dust.
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 refrigeration 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 outdoor heat exchanger 2, the frequency f of the compressor 3 is decreased to the preset frequency f1So that the four-way valve 5 can change the direction to change the flowing direction of the refrigerant. The indoor fan 11 stops running to avoid conveying hot air to the indoor in the self-cleaning process;
after reversing, the compressor 3 is driven from the frequency f1Is raised to a frequency f2Wherein the frequency f2Higher than the normal working frequency f of the compressor 3, so as to ensure that the refrigerant recovery can be completed quickly. Frequency is raised to f2While (or with increasing frequency to f)2Thereafter), the electronic expansion valve 4 is closed to start the recovery of the refrigerant. At this time, the outdoor fan 21 is set to be lower than raoThe rotating speed of the air conditioner is increased, so that the heating efficiency of the air conditioner after the air conditioner is reversed is prevented from being too high, and the user experience is reduced. Compressor 3 at frequency f2In operation, the refrigerant flows toward the indoor side of the air conditioner and is collected. After a predetermined time (30 seconds as shown in fig. 3), the refrigerant flows and is collected to the outsideIndoor side, at t1The first solenoid valve 31 is closed within a time to completely cut off the flow path of the refrigerant, and the entire recovery process of the refrigerant is completed. Wherein the frequency of the compressor 3 is from f while the first electromagnetic valve 31 is closed2Gradually decreases to stop, and the rotation speed of the outdoor fan 21 gradually decreases to zero, so as to reduce the energy consumption of the air conditioner and the pressure of the refrigerant on 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 outdoor heat exchanger 2, and the pulse vibration device 6 is operated for a certain period of time to completely crush and shake off the dirt inside the outdoor heat exchanger 2, 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 indoor fan 11, the outdoor fan 21, and the compressor 3 are always in a deactivated state, and the electronic expansion valve 4 and the first electromagnetic valve 31 are always in a closed state.
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 first electromagnetic valve 31 is opened, the compressor 3 and the indoor fan 11 are opened, and the frequency and the rotating speed of the compressor 3 and the indoor fan 11 are respectively increased to fmaxAnd rn-maxSo that the refrigerant with a large flow rate circularly flows again to flow through the outdoor heat exchanger 2 to flush the outdoor heat exchanger 2, and dirt in the outdoor heat exchanger 2 can flow out of the outdoor heat exchanger 2 along with the circulating flow of the refrigerant. Wherein, in order to further accelerate the self-cleaning efficiency, the outdoor fan raoAlso gradually increases to the maximum rotation speed rao-max. And after the compressor 3 stops operating until the compressor 3 rises above the frequency f2Previously, the four-way valve 5 was reversed so that the air conditioner could cool the user while the above-described flushing process was in progress. A filtering device is arranged on the outdoor heat exchanger 2 or the compressor 3 or between the outdoor heat exchanger 2 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 limitedSpecifically, the specific filtering scheme 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 affected. 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 refrigeration 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 four steps of "opening the electronic expansion valve 4 to the preset opening degree", "opening the first solenoid valve 31", "raising the frequency of the compressor 3", and "raising the rotational speed of the indoor fan 11" are performed simultaneously, the four steps are considered to be performed simultaneously although the end times of the four 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 outdoor heat exchanger, and the self-cleaning control method comprises the following steps:
under the refrigeration working 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 outdoor heat exchanger;
and opening the electronic expansion valve to a preset opening degree, opening the electromagnetic valve, increasing the frequency of the compressor, and increasing the rotating speed of an indoor fan of the air conditioner, so that the crushed dirt in the outdoor 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 of claim 1, wherein the step of "upshifting the compressor" specifically comprises:
gradually increasing the frequency of the compressor to a maximum frequency.
4. The self-cleaning control method according to claim 1, wherein the step of "increasing the rotation speed of the indoor fan of the air conditioner" specifically comprises:
and gradually increasing the rotating speed of an indoor fan of the air conditioner to the maximum rotating speed.
5. 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", "raising the frequency of the compressor", and "raising the rotation speed of an indoor fan of the air conditioner" are performed simultaneously.
6. The self-cleaning control method of claim 1, simultaneously with the step of closing the solenoid valve of the low pressure side of the compressor, the self-cleaning control method further comprising:
the compressor is stopped.
7. The self-cleaning control method of claim 5, wherein after the step of "closing a solenoid valve of a low pressure side of the compressor" and before the step of "raising the frequency of the compressor", the self-cleaning control method further comprises:
and reversing the four-way valve.
8. The self-cleaning control method of claim 1, wherein, simultaneously with the step of "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.
9. The self-cleaning control method according to claim 1, wherein, simultaneously with the step of opening the electronic expansion valve to a preset opening degree, the self-cleaning control method further comprises:
and closing the pulse vibration device.
10. An air conditioner characterized by comprising a control unit for executing the self-cleaning control method of any one of claims 1 to 9.
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| CN201810920799.4A CN110822624A (en) | 2018-08-14 | 2018-08-14 | Self-cleaning control method for air conditioner |
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| CN201810920799.4A CN110822624A (en) | 2018-08-14 | 2018-08-14 | Self-cleaning control method for air conditioner |
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| CN113654196A (en) * | 2021-07-15 | 2021-11-16 | 青岛海尔空调器有限总公司 | Method for controlling self-cleaning in indoor heat exchanger |
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