CN113639411B - Method for controlling external self-cleaning of outdoor heat exchanger - Google Patents
Method for controlling external self-cleaning of outdoor heat exchanger Download PDFInfo
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- CN113639411B CN113639411B CN202110802943.6A CN202110802943A CN113639411B CN 113639411 B CN113639411 B CN 113639411B CN 202110802943 A CN202110802943 A CN 202110802943A CN 113639411 B CN113639411 B CN 113639411B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—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
- 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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
The invention relates to the technical field of air conditioner self-cleaning, in particular to an external pipe self-cleaning control method of an outdoor heat exchanger. The method aims to solve the problem that the self-cleaning degree cannot be controlled according to the dirt degree of the outdoor coil pipe in the existing self-cleaning control method. To this end, the air conditioner of the present application includes a recovery line, a first on-off valve, and a second on-off valve. The control method comprises the following steps: acquiring operating parameters of an outdoor fan; judging the dust adhesion degree of the outdoor heat exchanger based on the operation parameters; executing a corresponding external pipe self-cleaning mode based on the dust adhesion degree; the degree of dust adhesion includes light adhesion, moderate adhesion, and heavy adhesion, and the outside-tube self-cleaning mode includes a light self-cleaning mode, a moderate self-cleaning mode, and a deep self-cleaning mode. This application can carry out assorted outside of tubes automatically cleaning mode based on outdoor heat exchanger's dust adheres to the degree, realizes more intelligent outside of tubes automatically cleaning.
Description
Technical Field
The invention relates to the technical field of air conditioner self-cleaning, in particular to an external pipe self-cleaning control method of an outdoor heat exchanger.
Background
The existing air conditioner has the self-cleaning function of the internal and external machines. Taking the self-cleaning process of the outdoor heat exchanger as an example, when the self-cleaning function is executed, the frosting and defrosting operations of the outdoor coil pipe are realized through the mode switching of cooling and heating, so that the dirt attached to the outdoor coil pipe is flushed away when the frost layer melts.
However, the cleaning mode of the current air conditioner is fixed after entering the self-cleaning mode, and the self-cleaning degree cannot be intelligently controlled according to the dirt condition of the outdoor coil pipe, so that the self-cleaning time is long when the dirt degree of the outer surface of the outdoor coil pipe is light, the normal experience of a user is influenced, and the self-cleaning is not thorough when the dirt degree of the outer surface of the outdoor coil pipe is serious.
Accordingly, there is a need in the art for a new method of controlling the external self-cleaning of the outdoor heat exchanger to solve the above problems.
Disclosure of Invention
In order to solve at least one of the above problems in the prior art, that is, to solve the problem that the existing self-cleaning control method cannot control the self-cleaning degree according to the contamination degree of the outdoor coil pipe, the present application provides an external self-cleaning control method of an outdoor heat exchanger, which is applied to an air conditioner, the air conditioner comprises a compressor, a four-way valve, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger that are sequentially connected through a refrigerant pipeline, the outdoor heat exchanger is provided with an outdoor fan, the air conditioner further comprises a recovery pipeline, a first on-off valve and a second on-off valve, the first on-off valve is arranged on the refrigerant pipeline between the indoor heat exchanger and the throttling device, one end of the recovery pipeline is arranged on the refrigerant pipeline between the first on-off valve and the throttling device, the other end of the recovery pipeline is communicated with an air suction port of the compressor, and the second on-off valve is arranged on the recovery pipeline,
the control method comprises the following steps:
acquiring the operating parameters of the outdoor fan;
judging the dust adhesion degree of the outdoor heat exchanger based on the operation parameters;
executing a corresponding external self-cleaning mode based on the dust adhesion degree;
the dust attachment degree comprises light attachment, moderate attachment and heavy attachment, and the external self-cleaning mode comprises a light self-cleaning mode, a moderate self-cleaning mode and a deep self-cleaning mode;
the mild self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; controlling the compressor to adjust to a first self-cleaning frequency; adjusting the opening degree of the throttling device to enable the temperature of a coil of the outdoor heat exchanger to be less than or equal to a first preset temperature, so that frosting is achieved; when the temperature of the coil pipe is less than or equal to the first preset temperature and lasts for a first preset time, controlling the air conditioner to be switched into a refrigeration mode; controlling the second on-off valve to be opened, and the throttling device to be opened to a first preset opening degree, and continuing for a second preset time to realize defrosting;
the moderate self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; controlling the compressor to adjust to a second self-cleaning frequency; adjusting the opening degree of the throttling device to enable the temperature of a coil of the outdoor heat exchanger to be less than or equal to a second preset temperature, so that frosting is achieved; when the temperature of the coil pipe is less than or equal to the second preset temperature and lasts for a third preset time, controlling the air conditioner to be switched into a refrigeration mode; controlling the first on-off valve and the second on-off valve to close; when a first preset condition is met, the second on-off valve is controlled to be opened, the throttling device is controlled to be opened to a second preset opening degree, and the fourth preset time is continued, so that defrosting is realized;
the deep self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; controlling the compressor to adjust to a third self-cleaning frequency; adjusting the opening degree of the throttling device to enable the temperature of a coil of the outdoor heat exchanger to be less than or equal to a third preset temperature, so that frosting is achieved; when the temperature of the coil pipe is less than or equal to the third preset temperature and lasts for a fifth preset time, controlling the air conditioner to be switched into a refrigeration mode; controlling the first on-off valve and the second on-off valve to close; when a second preset condition is met, the second on-off valve is controlled to be opened, and the throttling device is controlled to be opened to a third preset opening degree; after lasting for a sixth preset time, controlling the second cut-off valve to be closed; and when the second preset condition is met again, controlling the second on-off valve to be opened again, and continuing for a seventh preset time to realize defrosting.
In a preferred technical solution of the above method for controlling self-cleaning outside the tubes of the outdoor heat exchanger, the mild self-cleaning mode further includes: after the air conditioner is controlled to be switched into a refrigeration mode, controlling the compressor to adjust to the maximum limit frequency corresponding to the outdoor environment temperature; and/or
After controlling the air conditioner to be switched into a cooling mode, controlling an indoor fan to stop running; and/or
The mild self-cleaning mode further comprises: before the opening of the throttling device is adjusted, the outdoor fan is controlled to operate at the lowest wind speed, and the indoor fan is controlled to operate at a first preset rotating speed; and/or
The first preset opening degree is the maximum opening degree of the throttling device.
In a preferable technical solution of the method for controlling self-cleaning outside the tubes of the outdoor heat exchanger, the method further includes:
and after the second on-off valve is opened and the throttle device is opened to the first preset opening degree for the second preset time, the air conditioner exits from the mild self-cleaning mode and is controlled to be restored to the running state before entering the mild self-cleaning mode.
In a preferred technical solution of the above method for controlling self-cleaning of the outdoor heat exchanger, the moderate self-cleaning mode further includes: after the air conditioner is controlled to be switched into a refrigeration mode, controlling the compressor to adjust to the maximum limit frequency corresponding to the outdoor environment temperature; and/or
After controlling the air conditioner to be switched into a cooling mode, controlling an indoor fan to stop running; and/or
The moderate self-cleaning mode further comprises: before the opening degree of the throttling device is adjusted, the outdoor fan is controlled to operate at the lowest rotating speed, and the indoor fan is controlled to operate at a second preset rotating speed; and/or
The second preset opening degree is the maximum opening degree of the throttling device.
In a preferable technical solution of the method for controlling self-cleaning outside the tubes of the outdoor heat exchanger, the method further includes:
and after the second cut-off valve is opened and the throttle device is opened to a second preset opening degree for the fourth preset time, the air conditioner exits from the moderate self-cleaning mode and is controlled to be restored to the running state before entering the moderate self-cleaning mode.
In a preferred technical solution of the above method for controlling self-cleaning of the outdoor heat exchanger, the deep self-cleaning mode further includes: after the air conditioner is controlled to be switched into a refrigeration mode, controlling the compressor to adjust to the maximum limit frequency corresponding to the outdoor environment temperature; and/or
After controlling the air conditioner to be switched into a cooling mode, controlling an indoor fan to stop running; and/or
The deep self-cleaning mode further comprises: before the opening of the throttling device is adjusted, the outdoor fan is controlled to operate at the lowest rotating speed, and the indoor fan is controlled to operate at a third preset rotating speed; and/or
The third preset opening is the maximum opening of the throttling device.
In a preferable technical solution of the method for controlling self-cleaning outside the tubes of the outdoor heat exchanger, the method further includes:
and after the second cut-off valve is opened again for the seventh preset time, the deep self-cleaning mode is exited, and the air conditioner is controlled to be restored to the running state before the deep self-cleaning mode is entered.
In a preferable technical solution of the method for controlling self-cleaning outside the tubes of the outdoor heat exchanger, the method further includes:
and when the outdoor self-cleaning mode is entered, the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed.
In the preferable technical scheme of the control method for self-cleaning outside the tube of the outdoor heat exchanger, the outdoor fan is a direct current fan, the operation parameters comprise the actual rotating speed and the actual voltage value of the outdoor fan,
the step of "judging the degree of dust adhesion of the outdoor heat exchanger based on the operation parameter" further includes:
determining a theoretical voltage value corresponding to the actual rotating speed;
calculating the absolute value of the difference between the actual voltage value and the theoretical voltage value, and calculating the ratio of the absolute value of the difference to the theoretical voltage value;
when the ratio is greater than a first threshold value and less than or equal to a second threshold value, judging that the outdoor heat exchanger is slightly attached;
when the ratio is greater than the second threshold and less than or equal to a third threshold, judging that the outdoor heat exchanger is in the medium adhesion;
and when the ratio is larger than a third threshold value, judging that the outdoor heat exchanger is heavily attached.
In the preferable technical scheme of the control method for self-cleaning outside the tube of the outdoor heat exchanger, the outdoor fan is an alternating current fan, the operation parameters comprise the actual rotating speed and the actual current value of the outdoor fan,
the step of "judging the degree of dust adhesion of the outdoor heat exchanger based on the operation parameter" further includes:
determining a theoretical current value corresponding to the actual rotating speed;
calculating the absolute value of the difference value between the actual current value and the theoretical current value, and calculating the ratio of the absolute value of the difference value to the theoretical current value;
when the ratio is greater than a fourth threshold value and less than or equal to a fifth threshold value, judging that the outdoor heat exchanger is slightly adhered;
when the ratio is greater than the fifth threshold and less than or equal to a sixth threshold, judging that the outdoor heat exchanger is in the medium adhesion;
and when the ratio is larger than a sixth threshold value, judging that the outdoor heat exchanger is heavily attached.
By judging the dust adhesion degree of the outdoor heat exchanger according to the operation parameters of the outdoor fan and then operating different external pipe self-cleaning modes based on the dust adhesion degree, the control method not only can realize external pipe self-cleaning of the outdoor heat exchanger, but also can execute the matched external pipe self-cleaning mode based on the dust adhesion degree of the outdoor heat exchanger, thereby realizing more intelligent external pipe self-cleaning.
Drawings
The method for controlling the external self-cleaning of the outdoor heat exchanger according to the present invention will be described with reference to the accompanying drawings.
In the drawings:
FIG. 1 is a system diagram of an air conditioner of the present application in a heating mode;
FIG. 2 is a system diagram of the air conditioner of the present application in a cooling mode;
FIG. 3 is a flow chart of an external tube self-cleaning control method for an outdoor heat exchanger according to the present application;
fig. 4 is a logic diagram of a possible implementation process of the method for controlling the external self-cleaning of the outdoor heat exchanger according to the present application.
List of reference numerals
1. A compressor; 2. a four-way valve; 3. an outdoor heat exchanger; 4. a throttling device; 5. an indoor heat exchanger; 6. a refrigerant pipeline; 7. a recovery pipeline; 8. a first on-off valve; 9. a second on-off valve; 11. a reservoir.
Detailed Description
Preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principles of the present application, and are not intended to limit the scope of the present application. For example, although the following detailed description describes the detailed steps of the method of the present application, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present application, and the modified technical solution does not change the basic concept of the present application and therefore falls within the protection scope of the present application.
It should be noted that, in the description of the present application, the terms "first", "second", "third", "fourth", "fifth", "sixth", and "seventh" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It should also be noted that, in the description of the present application, unless explicitly stated or limited otherwise, the term "connected" is to be understood broadly, for example, it may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those skilled in the art according to specific situations.
First, referring to fig. 1, the structure of the air conditioner of the present application will be described. Fig. 1 is a system diagram of an air conditioner according to the present invention in a heating mode.
As shown in fig. 1, in one possible embodiment, the air conditioner includes a compressor 1, a four-way valve 2, an indoor heat exchanger 5, a throttle device 4, an outdoor heat exchanger 3, and a reservoir 11, the indoor heat exchanger 5 being provided with an indoor fan, and the outdoor heat exchanger 3 being provided with an outdoor fan. Compressor 1 'S gas vent passes through refrigerant pipeline 6 and the P interface intercommunication of cross valve 2, the E interface of cross valve 2 passes through refrigerant pipeline 6 and indoor heat exchanger 5' S import intercommunication, refrigerant pipeline 6 and throttling arrangement 4 'S a port intercommunication is passed through in indoor heat exchanger 5' S export, refrigerant pipeline 6 and outdoor heat exchanger 3 'S import intercommunication is passed through to throttling arrangement 4' S another port, refrigerant pipeline 6 and cross valve 2 'S C interface intercommunication is passed through in outdoor heat exchanger 3' S export, refrigerant pipeline 6 and reservoir 11 'S import intercommunication is passed through to cross valve 2' S S interface, the pipeline is passed through in reservoir 11 'S export and compressor 1' S induction port intercommunication. The throttling device 4 is preferably an electronic expansion valve, a filter screen is arranged in the liquid storage device 11, and the liquid storage device 11 can play roles in storing the refrigerant, separating gas from liquid of the refrigerant, filtering oil stain, silencing, buffering the refrigerant and the like.
The air conditioner further comprises a first on-off valve 8, a second on-off valve 9 and a recovery pipeline 7, the first on-off valve 8 and the second on-off valve 9 are preferably electromagnetic valves, the first on-off valve 8 is a normally open valve and is arranged on a refrigerant pipeline 6 between the throttling device 4 and the indoor heat exchanger 5, the second on-off valve 9 is a normally closed valve and is arranged on the recovery pipeline 7, the recovery pipeline 7 is a copper pipe with a smooth inner wall, the first end of the copper pipe is arranged on the refrigerant pipeline 6 between the throttling device 4 and the first on-off valve 8, and the second end of the copper pipe is arranged on the refrigerant pipeline 6 between an S interface of the four-way valve 2 and an inlet of the liquid reservoir 11. The first on-off valve 8 and the second on-off valve 9 are in communication connection with a controller of the air conditioner to receive opening and closing signals sent by the controller. Of course, one or more of the on-off valves may be replaced by an electronic control valve such as an electronic expansion valve.
The method for controlling the external self-cleaning of the outdoor heat exchanger in the following embodiment will be described in conjunction with the structure of the air conditioner, but it will be understood by those skilled in the art that the specific structural composition of the air conditioner is not constant, and those skilled in the art may adjust the method, for example, components may be added or deleted on the basis of the structure of the air conditioner.
The method for controlling the self-cleaning outside the tubes of the outdoor heat exchanger according to the present application is described with reference to fig. 1, 2 and 3. Fig. 2 is a system diagram of the air conditioner of the present application in a cooling mode; fig. 3 is a flowchart of an external tube self-cleaning control method of an outdoor heat exchanger according to the present application.
As shown in fig. 3, in order to solve the problem that the existing self-cleaning control method cannot control the self-cleaning degree according to the contamination degree of the outdoor heat exchanger, the method for controlling the external self-cleaning of the outdoor heat exchanger according to the present application includes:
s101, obtaining the operation parameters of the outdoor fan.
In a possible implementation manner, the operation parameters of the outdoor fan include an actual rotating speed, an actual current value, an actual voltage value and the like, and one or more of the operation parameters of the outdoor fan are obtained in the operation process of the air conditioner. The above-mentioned obtaining manner of the operation parameters all belongs to the conventional means in the field, and is not described herein again.
And S103, judging the dust adhesion degree of the outdoor heat exchanger based on the operation parameters.
In a possible implementation manner, the range of the operation parameter or the size of the operation parameter is determined by reasonably calculating the operation parameter, comparing the operation parameter with a preset threshold value and the like, and then determining the dust attachment degree of the outdoor heat exchanger.
And S105, executing a corresponding external pipe self-cleaning mode based on the dust adhesion degree.
In one possible embodiment, the dust attachment degree of the present application may be classified into light attachment, moderate attachment, and heavy attachment, and accordingly, the external self-cleaning mode includes a light self-cleaning mode, a moderate self-cleaning mode, and a deep self-cleaning mode for each dust attachment degree. That is, when it is determined that the degree of dust adhesion of the outdoor heat exchanger is light adhesion, controlling the air conditioner to perform a light self-cleaning mode; when the dust attachment degree of the outdoor heat exchanger is judged to be moderate, controlling the air conditioner to execute a moderate self-cleaning mode; and controlling the air conditioner to execute a deep self-cleaning mode when the dust attachment degree of the outdoor heat exchanger is judged to be heavy.
It can be seen that the control method not only can realize the external pipe self-cleaning of the outdoor heat exchanger, but also can execute the external pipe self-cleaning mode with corresponding degree based on the dust adhesion degree of the outdoor heat exchanger, so that the self-cleaning effect is adaptive to the dust adhesion degree, and more intelligent external pipe self-cleaning is realized.
Several possible embodiments of the present application for judging the degree of dust adhesion of the outdoor heat exchanger based on the operation parameters of the air conditioner are described below.
Example 1
In this embodiment, the outdoor fan is a direct current fan, the operation parameters include an actual rotation speed and an actual voltage value of the outdoor fan, and obtaining the operation parameters of the outdoor fan is to obtain the actual rotation speed and the actual voltage value of the outdoor fan. The mode of acquiring the actual voltage value of the outdoor fan belongs to conventional means in the field, and is not described herein again. The actual rotating speed of the outdoor fan can be acquired in the following manner:
generally, the rotation speed of the indoor fan is set by a user or automatically, and the rotation speed of the outdoor fan is determined by the system according to the operating environment. In one possible embodiment, the rotational speed of the outdoor fan is determined by both the frequency of the compressor and the outdoor ambient temperature. Specifically, the rotation speed of the outdoor fan is determined by the following formula:
r＝a×f+b×Tao+c (1)
in the formula (1), r is the rotation speed of the outdoor fan, f is the operating frequency of the compressor, tao is the outdoor environment temperature, a is the frequency coefficient, b is the temperature coefficient, and c is a constant. a. b, c can be determined based on experimental procedures, which are roughly as follows: and adjusting the rotating speed of the outdoor fan according to the operating frequency and the outdoor environment temperature of each compressor, and obtaining the rotating speed of the outdoor fan when the heat exchange of the outdoor heat exchanger is better as the optimal rotating speed of the outdoor fan under the corresponding operating frequency and the outdoor environment temperature of the compressor. After the operating frequency of the compressor and the outdoor environment temperature are adjusted, a plurality of groups of test data of the optimal rotating speed are obtained, and the specific numerical values of a, b and c are obtained through fitting the test data.
When the air conditioner is operated, the actual rotating speed of the outdoor fan is determined and adjusted in real time based on the operating frequency of the compressor and the outdoor environment temperature. Therefore, the actual rotation speed of the outdoor fan is obtained, that is, the current compressor operating frequency and the outdoor environment temperature are obtained, and then the actual rotation speed of the outdoor fan is calculated based on the formula (1).
Of course, the actual rotating speed can be obtained by directly reading the rotating speed of the outdoor fan, and the actual rotating speed is obtained through a formula in the application, so that the following calculation and judgment processes are facilitated.
After the actual rotating speed and the actual voltage value of the outdoor fan are obtained, the step of determining the dust attachment degree of the outdoor heat exchanger based on the operation parameters further comprises the following steps:
determining a theoretical voltage value corresponding to the actual rotating speed; calculating the absolute value of the difference value between the actual voltage value and the theoretical voltage value, and calculating the ratio of the absolute value of the difference value to the theoretical voltage value; when the ratio is greater than the first threshold value and less than or equal to the second threshold value, judging that the outdoor heat exchanger is lightly attached; when the ratio is greater than the second threshold and less than or equal to a third threshold, judging that the outdoor heat exchanger is moderately attached; and when the ratio is greater than a third threshold value, judging that the outdoor heat exchanger is heavily attached.
In one possible embodiment, the theoretical voltage value is determined experimentally. Specifically, for different actual rotation speeds of the outdoor fan (determined based on the above formula), the input current value is fixed under the same load (e.g., no dust attached to the outdoor heat exchanger), and then the bus voltage value at each rotation speed is recorded as the theoretical voltage value of the outdoor fan at the actual rotation speed. In the actual operation process, the actual load of the outdoor fan is changed due to the dust adhesion on the outdoor heat exchanger, when the actual rotating speed calculated according to the outdoor environment temperature and the operation frequency of the compressor is not changed, if the rotating speed is still reached, the air conditioner can automatically adjust the input voltage value of the outdoor fan, and the larger the load is, the larger the adjusted input voltage value is. Therefore, whether dust adhesion occurs and the degree of dust adhesion to the outdoor heat exchanger can be determined by comparing the actual voltage value of the outdoor fan with the theoretical voltage value thereof.
For example, assuming that the obtained theoretical voltage value corresponding to the actual rotation speed of the outdoor fan is Un and the actual voltage value of the outdoor fan is U, at this time, the absolute value Δ U = | U-Un | of the difference between the theoretical voltage value and the obtained theoretical voltage value is calculated, then the ratio Δ U/Un of the difference Δ U to the theoretical voltage value is calculated, and the range of the ratio is determined. In the application, a first threshold, a second threshold and a third threshold are sequentially increased, wherein the first threshold is any value from 0.9 to 1.05, the second threshold is any value from 1.05 to 1.2, and the third threshold is any value from 1.3 to 1.6. In the application, for example, the first threshold is 1, the second threshold is 1.1, and the third threshold is 1.5, if delta U/Un is less than or equal to 1, the dust attachment degree of the outdoor heat exchanger is not large, and self-cleaning is not needed; if 1 & ltdelta U/Un & gt is less than or equal to 1.1, the outdoor heat exchanger is considered to be lightly attached; if 1.1 <. DELTA.U/Un is less than or equal to 1.5, the outdoor heat exchanger is considered to be moderately attached; if DeltaU/Un is more than 1.5, the outdoor heat exchanger is considered to be heavily attached.
Example 2
In this embodiment, the outdoor fan is an ac fan, the operation parameters include an actual rotation speed and an actual current value of the outdoor fan, and the operation parameters of the outdoor fan, that is, the actual rotation speed and the actual current value of the outdoor fan, are obtained. The mode of acquiring the actual current value of the outdoor fan belongs to conventional means in the field, and is not described herein again. The actual rotation speed of the outdoor fan may be obtained in the same manner as in embodiment 1, and may be obtained by a formula, or may be directly obtained.
After the actual rotating speed and the actual current value of the outdoor fan are obtained, the step of determining the dust attachment degree of the outdoor heat exchanger based on the operation parameters further comprises the following steps:
determining a theoretical current value corresponding to the actual rotating speed; calculating the absolute value of the difference value between the actual current value and the theoretical current value, and calculating the ratio of the absolute value of the difference value to the theoretical current value; when the ratio is greater than the fourth threshold and less than or equal to the fifth threshold, judging that the outdoor heat exchanger is lightly adhered; when the ratio is greater than a fifth threshold and less than or equal to a sixth threshold, judging that the outdoor heat exchanger is moderately attached; and when the ratio is greater than a sixth threshold value, judging that the outdoor heat exchanger is heavily attached.
In one possible embodiment, the theoretical current value is determined experimentally. Specifically, for the ac fan, the voltage is a constant voltage, and for different actual rotation speeds of the outdoor fan (determined based on the above formula), the input current value at each rotation speed is recorded as the theoretical current value of the outdoor fan at the actual rotation speed under the same load (e.g., no dust attached to the outdoor heat exchanger). In the actual operation process, the actual load of the outdoor fan is changed due to the attachment of dust on the outdoor heat exchanger, when the actual rotating speed calculated according to the formula is not changed, if the rotating speed is still required to be reached, the air conditioner can automatically adjust the input current value of the outdoor fan, and the larger the load is, the larger the adjusted input current value is. Therefore, whether dust adhesion occurs and the degree of dust adhesion to the outdoor heat exchanger can be determined by comparing the actual current value of the outdoor fan with the theoretical current value thereof.
For example, assuming that the obtained theoretical current value corresponding to the actual rotation speed of the outdoor fan is In and the actual current value of the outdoor fan is I, at this time, an absolute value Δ I = | I-In | of a difference between the theoretical current value and the obtained theoretical current value is calculated, then a ratio Δ I/In of the difference Δ I to the theoretical current value is calculated, and a range where the ratio is located is determined. In the present application, the fourth threshold, the fifth threshold and the sixth threshold are sequentially increased, where the fourth threshold is any value from 0.9 to 1.05, the fifth threshold is any value from 1.05 to 1.2, and the sixth threshold is any value from 1.3 to 1.6. Taking the fourth threshold as 1, the fifth threshold as 1.1 and the sixth threshold as 1.5 as examples, if Δ I/In is less than or equal to 1, the dust attachment degree of the outdoor heat exchanger is considered to be low, and self-cleaning is not needed; if 1 & ltdelta I/In & lt 1.1 & gt, the outdoor heat exchanger is considered to be lightly attached; if 1.1 <. DELTA.I/In is less than or equal to 1.5, the outdoor heat exchanger is considered to be moderately attached; if DeltaI/In is more than 1.5, the outdoor heat exchanger is considered to be heavily attached.
The specific control procedure of each of the external pipe self-cleaning modes of the present application is described below.
In one possible embodiment, the mild self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; controlling the compressor to adjust to a first self-cleaning frequency; adjusting the opening degree of the throttling device to enable the temperature of a coil of the outdoor heat exchanger to be less than or equal to a first preset temperature, and realizing frosting of the outer surface of the coil; when the temperature of the coil pipe is less than or equal to a first preset temperature and lasts for a first preset time, controlling the air conditioner to be switched into a refrigeration mode; and controlling the second on-off valve to be opened and the throttling device to be opened to a first preset opening degree, and continuing for a second preset time to realize defrosting of the outer surface of the coil. In particular, the amount of the solvent to be used,
first, the air conditioner is controlled to operate a heating mode. The switching between the operation modes of the air conditioner may be controlled by controlling the switching on and off of the four-way valve, for example, when the four-way valve is energized, the air conditioner operates in a heating mode, and when the four-way valve is de-energized, the air conditioner operates in a cooling mode. In the embodiment, after entering the mild self-cleaning mode, if the air conditioner is in the heating mode, the air conditioner is controlled to continue to operate without adjustment; and if the air conditioner is operating in the non-heating mode, controlling the air conditioner to switch to the heating mode for operation.
The compressor is then controlled to adjust to the first self-cleaning frequency. The first self-cleaning frequency is a frequency determined in advance through experiments, and may be determined based on a correspondence between the outdoor ambient temperature and the first self-cleaning frequency in table 1 below, for example. When the compressor is operating at the first self-cleaning frequency, it facilitates implementation of a subsequent control process.
TABLE 1 comparison table of outdoor ambient temperature and first self-cleaning frequency
| Outdoor ambient temperature (. Degree. C.) | First self-cleaning frequency (Hz) |
| Tao≤-20 | Outer ring temperature frequency limit maximum frequency-5 |
| -20<Tao≤-10 | Outer ring temperature frequency limit maximum frequency-5 |
| -10<Tao≤-5 | Outer ring temperature frequency limit maximum frequency-5 |
| -5<Tao≤0 | Outer loop temperature frequency limiting maximum frequency |
| 0<Tao≤5 | Outer loop temperature frequency limiting |
| 5<Tao≤10 | Outer ring temperature frequency limiting maximum frequency +5 |
| 10<Tao≤16 | Outer ring temperature frequency limiting maximum frequency +5 |
| Tao>16 | Outer ring temperature frequency limit |
And then, adjusting the opening of the throttling device to enable the temperature of the coil of the outdoor heat exchanger to be less than or equal to a first preset temperature, and realizing frosting of the outer surface of the coil. In a possible implementation manner, the temperature of the coil of the outdoor heat exchanger can be detected by the temperature sensor, and the opening degree of the electronic expansion valve is dynamically adjusted, so that the temperature of the coil of the outdoor heat exchanger is less than or equal to a first preset temperature. Because dust is attached to the outer surface of the outdoor heat exchanger, the outer surface of the coil pipe can frost after the temperature of the coil pipe is reduced to a certain temperature and lasts for a certain time. The first preset temperature may be set to-1 ℃ to-10 ℃ in the present application, and the first preset temperature may be set to-5 ℃ in the present application. That is, the coil temperature of the outdoor heat exchanger is controlled to be equal to or lower than a first preset temperature, and the coil temperature of the outdoor heat exchanger is always in a state of being equal to or lower than the first preset temperature by adjusting the opening degree of the electronic expansion valve (such as PID adjustment).
Referring to fig. 1, when the air conditioner operates in a heating mode, the temperature of the coil of the outdoor heat exchanger is maintained at-5 ℃ or less, and frost may be formed on the outer surface of the outdoor heat exchanger.
Of course, in other embodiments, the coil temperature of the outdoor heat exchanger may be set to be equal to or lower than the first preset temperature by adjusting the opening degree of the electronic expansion valve to a fixed opening degree.
And then, when the temperature of the coil pipe is less than or equal to a first preset temperature and lasts for a first preset time, controlling the air conditioner to be switched into a refrigeration mode. The first preset time period can be any value in the range of 5-15 min. Preferably, the first preset time period in this embodiment is 10min, and when the temperature of the coil is less than or equal to-5 ℃ and lasts for 10min, a layer of frost is formed on the surface of the outdoor heat exchanger, and at this time, the defrosting operation may be performed on the outdoor heat exchanger. At this time, the switching between the operation modes of the air conditioner is controlled by controlling the on/off of the four-way valve, for example, the four-way valve is controlled to be powered off, and the air conditioner operates in a cooling mode.
And finally, controlling the second on-off valve to be opened, and controlling the throttling device to be opened to a first preset opening degree, and continuing for a second preset time to realize defrosting. In this application, the first preset opening degree is the maximum opening degree of the throttle device. The second preset time period can be any value from 3min to 10min, and the application is preferably 5min. And when the operation mode is switched to the refrigeration mode, controlling the second cut-off valve to be opened, controlling the throttling device to be opened to the maximum opening degree, and keeping the state to continuously operate for 5min. At this time, as indicated by arrows in fig. 2, the high-temperature and high-pressure refrigerant discharged from the compressor flows through the outdoor heat exchanger, and exchanges heat with the coil of the outdoor heat exchanger to melt the frost layer on the outer surface of the outdoor heat exchanger, and the dust attached to the outer surface of the outdoor heat exchanger also flows away along with the melt water. The high-temperature refrigerant flows back to the liquid storage device through the recovery pipeline, and the purpose of self-cleaning outside the tube of the outdoor heat exchanger is achieved. The throttling device is controlled to be opened to the maximum opening degree, so that high-temperature and high-pressure refrigerants can rapidly pass through the throttling device, the pressure drop in the flowing process of the refrigerants is reduced, and the self-cleaning effect outside the pipe is improved.
In one possible embodiment, the mild self-cleaning mode further comprises: after the step of controlling the air conditioner to switch to the cooling mode, controlling the compressor to adjust to the maximum limit frequency corresponding to the outdoor environment temperature. Generally, the operation frequency of the compressor is affected by the outdoor environment temperature, and cannot be increased without limit, otherwise, the phenomenon of high-temperature protection shutdown of the compressor is easy to occur, and the service life of the compressor is adversely affected. Therefore, the compressors are provided with protection mechanisms, and the maximum limit frequency is correspondingly set under different outdoor environment temperatures. The manner of acquiring the outdoor ambient temperature is a conventional means in the art, and is not described herein again.
In one possible embodiment, the mild self-cleaning mode further comprises: before the opening of the throttling device is adjusted, the outdoor fan is controlled to operate at the lowest rotating speed, and the indoor fan is controlled to operate at the first preset rotating speed. Specifically, in the mild self-cleaning mode, the outdoor fan is controlled to operate at the lowest rotating speed before the opening degree of the throttling device is adjusted, so that the heat exchange effect between the outdoor heat exchanger and air is reduced, the reduction speed of the temperature of the outdoor coil pipe can be increased, and the external self-cleaning efficiency is improved. The first preset rotating speed can be a low rotating speed in the rotating speeds of the indoor fans, such as 400r/min-700r/min, and can be 500r/min, and since dust of the outdoor heat exchanger is not seriously attached and the indoor environment temperature is being adjusted before the air conditioner enters the slight self-cleaning mode, on the basis of ensuring the self-cleaning effect, certain indoor comfort level can be ensured by controlling the outdoor fan to operate at the lowest rotating speed and controlling the indoor fan to operate at the first preset rotating speed.
In one possible embodiment, the indoor fan is controlled to stop operating after the air conditioner is controlled to be switched to the cooling mode. Specifically, when the refrigeration mode is operated, the outlet air temperature of the indoor unit is gradually reduced, and poor use experience can be brought to users. At this moment, the operation of the indoor fan is stopped after 30s, so that the influence on user experience caused by too low air outlet temperature can be avoided. Of course, the person skilled in the art can adjust the above 30s, for example, to any value within 10s-1 min.
In one possible embodiment, the method further comprises: and when entering a slight self-cleaning mode, closing the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function. Because the temperature of the coil of the outdoor heat exchanger needs to be reduced to a lower value, the compressor needs to be operated at high frequency in order to reach the condition as soon as possible, and therefore in the heating operation process, the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed, so that the smooth execution of the method is ensured. However, other protection functions of the air conditioner are started as usual, such as the functions of compressor exhaust protection, current overload protection and the like are kept started, and adverse effects on the service life of the air conditioner are prevented.
Of course, the specific control process of the mild self-cleaning mode is not exclusive, and the control mode can be adjusted by those skilled in the art. For example, one or more of the operating frequency of the compressor, the opening degree of the electronic expansion valve, the rotational speed of the indoor fan, and the rotational speed of the outdoor fan in the above-described control method may be omitted on the premise that the coil temperature of the outdoor heat exchanger can be maintained at or below the first preset temperature. For another example, after the air conditioner is controlled to switch to the cooling mode, no adjustment may be made to the throttle device.
In one possible embodiment, the method further comprises: and after the second on-off valve is opened and the throttling device is opened to the maximum opening degree for the second preset time, the air conditioner exits from the mild self-cleaning mode and is controlled to be restored to the running state before the air conditioner enters the mild self-cleaning mode. When the second on-off valve is opened and the throttling device is opened to the maximum opening for 5min, the high-temperature and high-pressure refrigerant is circulated for multiple times to complete the defrosting operation, so that the mild self-cleaning mode can be exited when the second on-off valve is opened and the throttling device is opened to the maximum opening for 5min.
Specifically, the step of exiting the mild self-cleaning mode further comprises: the air conditioner is controlled to recover to the running mode before entering the mild self-cleaning mode, the compressor is controlled to recover to the frequency before entering the mild self-cleaning mode, the indoor fan is controlled to be started, the air deflector of the indoor unit supplies air upwards, the throttling device is controlled to be opened to the maximum opening degree, and the second cut-off valve is controlled to be closed. After the mild self-cleaning mode is performed, the air conditioner needs to be returned to the operation mode before entering the mild self-cleaning mode to continuously adjust the indoor temperature. In the following, taking the air conditioner running heating mode before entering the mild self-cleaning mode as an example, after the mild self-cleaning mode is executed, the air conditioner needs to be switched back to the heating mode to run. At the moment, the four-way valve is controlled to be electrified to recover the heating mode, the compressor is controlled to recover from the highest limit frequency to the frequency before entering the slight self-cleaning mode, the indoor fan is controlled to be started, the air deflector of the indoor unit supplies air upwards, the electronic expansion valve is controlled to be opened to the maximum opening degree, and the second on-off valve is controlled to be closed, so that the refrigerant flows in the flow direction of the normal heating mode. The indoor fan is opened, the air guide plate of the indoor unit supplies air upwards, and poor use experience brought to users due to the fact that the temperature of the coil pipe of the outdoor heat exchanger is too low and the air outlet is poor when the air conditioner is just switched to the heating mode is prevented. The throttling device is opened to the maximum opening degree, and refrigerant circulates between the compressor and the outdoor heat exchanger when the compressor operates in the mild self-cleaning mode, so that refrigerant in the indoor heat exchanger is lost, and the throttling device is opened to the maximum opening degree, so that the refrigerant is quickly filled in the indoor heat exchanger, and normal circulation of the refrigerant is realized as soon as possible.
Correspondingly, after the indoor fan is controlled to be started and the air guide plate supplies air upwards for the first duration, the indoor fan and the air guide plate are controlled to be restored to the running state before the light self-cleaning mode is entered. The first duration time can be any value within 20s-1min, the time is preferably 30s in the application, after the indoor fan is started and the air deflector supplies air upwards for 30s, the temperature of the coil pipe of the outdoor heat exchanger is reduced to the temperature matched with the heating mode, and the indoor fan and the air deflector are controlled to be restored to the operation mode before the mild self-cleaning mode, so that the heating requirement of a user is met.
Accordingly, after controlling the throttle device to be opened to the maximum opening degree for the second duration, the throttle device is controlled to be returned to the opening degree before entering the mild self-cleaning mode. The second duration time can be any value within 1-5min, the application is preferably 3min, after the electronic expansion valve keeps the maximum opening degree and operates for 3min, the refrigerant circulation tends to be stable, and at the moment, the electronic expansion valve is controlled to recover to the opening degree before the air conditioner enters the slight self-cleaning mode, so that the air conditioner completely recovers to continue to operate the heating parameters before the air conditioner enters the slight self-cleaning mode.
Of course, the manner of exiting the mild self-cleaning mode is not limited to the above-mentioned one, and a person skilled in the art may freely select a specific control manner without departing from the principles of the present application, provided that the air conditioner can be restored to the operating state before entering the mild self-cleaning mode. For example, the outdoor fan may be controlled to return to the operation state before entering the mild self-cleaning mode; for another example, the indoor fan may be controlled to be turned off, and then the indoor fan may be controlled to start operation after the temperature of the coil of the outdoor heat exchanger is obtained and is reduced to the temperature suitable for the heating mode. As another example, it is also possible to control the components of the air conditioner to directly return to the operating parameters before entering the mild self-cleaning mode.
In one possible embodiment, the moderate self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; controlling the compressor to adjust to a second self-cleaning frequency; adjusting the opening degree of the throttling device to enable the temperature of a coil of the outdoor heat exchanger to be less than or equal to a second preset temperature, and realizing frosting; when the temperature of the coil pipe is less than or equal to the second preset temperature and lasts for a third preset time, controlling the air conditioner to be switched to a refrigeration mode; controlling the first on-off valve and the second on-off valve to close; and when the first preset condition is met, the second on-off valve is controlled to be opened, the throttling device is controlled to be opened to a second preset opening degree, and the fourth preset time duration is continued, so that defrosting is realized. In particular, the amount of the solvent to be used,
first, the air conditioner is controlled to operate a heating mode. Similarly to the above-described mild self-cleaning mode, switching between the operation modes of the air conditioner can be controlled by controlling the on/off of the four-way valve. In the embodiment, after the medium self-cleaning mode is entered, if the air conditioner is in the heating mode, the air conditioner is controlled to continue to operate without adjustment; and if the air conditioner is operating in the non-heating mode, controlling the air conditioner to switch to the heating mode for operation.
The compressor is then controlled to adjust to a second self-cleaning frequency. The second self-cleaning frequency is a frequency determined in advance through experiments, and the determination manner can refer to table 1, which is not described herein again. When the compressor is operating at the second self-cleaning frequency, it facilitates implementation of a subsequent control process.
And then, adjusting the opening of the throttling device to enable the temperature of the coil of the outdoor heat exchanger to be less than or equal to a second preset temperature, and realizing frosting of the outer surface of the coil. Preferably, the second preset temperature is lower than the first preset temperature, and in the present application, the second preset temperature may be-10 ℃. That is, the coil temperature of the outdoor heat exchanger is controlled to be equal to or lower than the second preset temperature, and the opening degree of the electronic expansion valve is adjusted (for example, by PID adjustment) so that the coil temperature of the outdoor heat exchanger is always equal to or lower than the second preset temperature. In this way, the outer surface of the coil can be made to frost faster and with a thicker frost layer than in the mild self-cleaning mode.
Referring to fig. 1, in a heating mode of an air conditioner, a coil temperature of an outdoor heat exchanger is maintained at-10 ℃ or lower, and frost is formed on an outer surface of the outdoor heat exchanger and a frost layer is attached to the outer surface of the coil of the outdoor heat exchanger.
Of course, in other embodiments, the coil temperature of the outdoor heat exchanger may be set to be equal to or lower than the second preset temperature by adjusting the opening degree of the electronic expansion valve to a fixed opening degree.
And then, when the temperature of the coil pipe is less than or equal to the second preset temperature and lasts for a third preset time, controlling the air conditioner to be switched into a refrigeration mode. The third preset time period can be any value in the range of 5-15 min. Preferably, the third preset time period in this embodiment is 10min, and when the temperature of the coil is less than or equal to-10 ℃ and lasts for 10min, a layer of frost is formed on the surface of the outdoor heat exchanger, at this time, the defrosting operation may be performed on the outdoor heat exchanger. At this time, the switching between the operation modes of the air conditioner is controlled by controlling the on/off of the four-way valve, for example, the four-way valve is controlled to be powered off, and the air conditioner operates in a cooling mode.
And then, after the air conditioner is switched to the cooling mode, controlling the first on-off valve and the second on-off valve to be closed. After the first on-off valve and the second on-off valve are closed, the refrigerant pipeline between the throttling device and the indoor heat exchanger and the recovery pipeline are throttled, and at the moment, as shown in fig. 2, the refrigerants in the indoor heat exchanger and the refrigerant pipeline are discharged by the compressor and are accumulated in the outdoor heat exchanger.
And finally, judging whether a first preset condition is met, and controlling the second stop valve to be opened and the throttling device to be opened to a second preset opening degree for a fourth preset time when the first preset condition is met. In this application, the first preset condition is that the discharge temperature of the compressor is greater than or equal to the discharge temperature threshold and lasts for an eighth preset time. Wherein the eighth preset time period is preferably any value from 3s to 10s, and takes 5s in the application. The exhaust temperature may be obtained continuously or at intervals, such as every 1s-5 s. In this application, the second preset opening is the maximum opening of the throttling device, and the throttling device is controlled to be opened to the maximum opening, so that the high-temperature and high-pressure refrigerant can rapidly pass through the throttling device. The fourth preset time period can be any value from 3min to 10min, and the application is preferably 5min. When the exhaust temperature is greater than or equal to the exhaust temperature threshold value and the eighth preset time is continued, the refrigerant is accumulated in the outdoor heat exchanger, the pressure of the exhaust port of the compressor is increased to a higher value at the moment, the condition is met, and defrosting operation can be performed. Therefore, when the conditions are met, the second cut-off valve is opened, the throttling device is opened to the maximum opening degree, the state is maintained for continuous operation for 5min, the high-temperature and high-pressure refrigerant defrosting is realized, and the defrosting speed and effect are ensured. At this time, as indicated by arrows in fig. 2, the high-temperature and high-pressure refrigerant discharged from the compressor flows through the outdoor heat exchanger, and exchanges heat with the coil of the outdoor heat exchanger to melt the frost layer on the outer surface of the outdoor heat exchanger, and the dust attached to the outer surface of the outdoor heat exchanger also flows away along with the melt water. The high-temperature refrigerant flows back to the liquid storage device through the recovery pipeline, and the purpose of self-cleaning outside the tube of the outdoor heat exchanger is achieved.
Although the exhaust temperature threshold is not exemplified in the above embodiments, this does not represent that the technical means of the present application cannot be implemented. On the contrary, a person skilled in the art can experimentally determine the exhaust temperature threshold value based on the principles disclosed in the present application, as long as the threshold value is set such that the second shut-off valve has a good defrosting effect on the outdoor heat exchanger when opened. In addition, the first preset condition is not limited to that the exhaust temperature is greater than or equal to the preset exhaust temperature threshold, and a person skilled in the art can substitute the exhaust temperature threshold with other parameters on the premise that the pressure/temperature state at the exhaust port of the compressor can be judged. For example, the comparison of the discharge pressure of the compressor and the preset discharge pressure can be selected as the first preset condition, or the comparison of the suction pressure of the compressor and the preset suction pressure threshold can be adopted as the first preset condition, etc.
In one possible embodiment, the moderate self-cleaning mode further comprises: after the step of controlling the air conditioner to switch to the cooling mode, controlling the compressor to adjust to the maximum limit frequency corresponding to the outdoor environment temperature. Generally, the operation frequency of the compressor is affected by the outdoor environment temperature, and cannot be increased without limit, otherwise, the phenomenon of high-temperature protection shutdown of the compressor is easy to occur, and the service life of the compressor is adversely affected. Therefore, the compressors are all provided with protection mechanisms, and the maximum limit frequency is correspondingly set at different outdoor environment temperatures. The obtaining method of the outdoor environment temperature is a conventional means in the field, and is not described herein again.
In one possible embodiment, the medium self-cleaning mode further comprises controlling the outdoor fan to operate at a minimum rotation speed and controlling the indoor fan to operate at a second preset rotation speed before adjusting the opening degree of the throttling device. Specifically, in the medium self-cleaning mode, before the opening of the throttling device is adjusted, the outdoor fan is controlled to run at the lowest rotating speed, so that the heat exchange effect between the outdoor heat exchanger and air is reduced, the reduction speed of the temperature of the outdoor coil pipe can be increased, and the external self-cleaning efficiency is improved. The second is predetermine the rotational speed and can be the maximum rotational speed of indoor fan in this application, because outdoor heat exchanger's dust adheres to comparatively seriously, consequently before adjusting throttling arrangement's aperture, through controlling indoor fan with the operation of maximum rotational speed, can improve the heat transfer effect between refrigerant and the environment among the indoor heat exchanger to reduce the temperature and the pressure of refrigerant, improve the evaporation effect of refrigerant in outdoor heat exchanger, make outdoor coil pipe reduce to the second with faster speed and predetermine the temperature.
In one possible embodiment, the moderate self-cleaning mode further comprises: and after controlling the air conditioner to be switched into the cooling mode, controlling the indoor fan to stop running. Specifically, when the refrigeration mode is operated, the outlet air temperature of the indoor unit is gradually reduced, and poor use experience can be brought to users. At this moment, the operation of the indoor fan is controlled to stop after 30s, and the influence on user experience due to too low air outlet temperature can be avoided. Of course, the person skilled in the art can adjust the above 30s, for example, to any value within 10s-1 min.
In one possible embodiment, the method further comprises: when the air conditioner enters the moderate self-cleaning mode, the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed, but other protection functions of the air conditioner are opened as usual. The purpose and implementation of this step are the same as in the light cleaning mode, and therefore are not described in detail.
Of course, the specific control procedure of the moderate self-cleaning mode is not exclusive, and the control mode can be adjusted by those skilled in the art. For example, one or more of the operating frequency of the compressor, the opening degree of the electronic expansion valve, the rotational speed of the indoor fan, and the rotational speed of the outdoor fan in the above control method may be omitted on the premise that the coil temperature of the outdoor heat exchanger can be maintained at the second preset temperature or lower. For another example, after the air conditioner is controlled to switch to the cooling mode, no adjustment may be made to the throttle device.
In one possible embodiment, the method further comprises: and after the second on-off valve is opened and the throttling device is opened to the maximum opening degree for a fourth preset time, the air conditioner exits from the moderate self-cleaning mode and is controlled to be restored to the running state before the air conditioner enters into the moderate self-cleaning mode. When the second on-off valve is opened and the throttling device is opened to the maximum time and lasts for 5min, the high-temperature and high-pressure refrigerant is circulated for many times to generate defrosting operation, so that the moderate self-cleaning mode can be exited when the second on-off valve is opened and the throttling device is opened to the maximum time and lasts for 5min.
In this application, the same control method as the above-mentioned method for exiting the mild self-cleaning mode may be adopted to achieve the purpose of exiting the moderate self-cleaning mode, and details are not described herein again.
Of course, the manner of exiting the moderate self-cleaning mode is not limited to the same manner as exiting the mild self-cleaning mode, and the skilled person can freely select a specific control manner without departing from the principles of the present application, provided that the air conditioner can be restored to the operation state before entering the moderate self-cleaning mode. For example, the outdoor fan may be controlled to return to the operating state before entering the moderate self-cleaning mode; for another example, the indoor fan may be controlled to be turned off, and then the indoor fan may be controlled to start operation after the temperature of the coil of the indoor heat exchanger is obtained to be raised to the temperature suitable for the heating mode. As another example, the various components of the air conditioner may be controlled to return directly to the operating parameters prior to entering the moderate self-cleaning mode.
In one possible embodiment, the deep self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; controlling the compressor to adjust to a third self-cleaning frequency; adjusting the opening degree of the throttling device to enable the temperature of a coil of the outdoor heat exchanger to be less than or equal to a third preset temperature, and achieving frosting; when the temperature of the coil pipe is less than or equal to the third preset temperature and lasts for a fifth preset time, controlling the air conditioner to be switched to a refrigeration mode; controlling the first on-off valve and the second on-off valve to be closed; when a second preset condition is met, the second on-off valve is controlled to be opened, and the throttling device is controlled to be opened to a third preset opening degree; after the sixth preset duration, controlling the second on-off valve to close; and when the second preset condition is met again, controlling the second on-off valve to be opened again, and continuing for a seventh preset time to realize defrosting. In particular, the amount of the solvent to be used,
preferably, the operation parameters of deep self-cleaning in the present application may be the same as the corresponding parameter settings in the moderate self-cleaning mode, that is, the parameters such as the third self-cleaning frequency, the third preset temperature, the fifth preset time, the second preset condition, and the sixth preset time are all the same as the moderate self-cleaning. The control process of the deep self-cleaning mode is different from the moderate self-cleaning mode in that:
and when a second preset condition is met, controlling the second on-off valve to be opened, controlling the throttling device to be opened to the maximum opening degree and continuing for a sixth preset time, not immediately exiting the deep self-cleaning mode, but controlling the second on-off valve to be closed again, continuously judging whether the second preset condition is met, and when the second preset condition is met, opening the second on-off valve again, defrosting the outdoor heat exchanger and continuing for a seventh preset time. Wherein the seventh preset duration may be any value from 1 to 5min, and 3min is selected in the present application. The first on-off valve is controlled to be closed and opened again, so that defrosting of the outdoor heat exchanger is more thorough, and the self-cleaning effect is more consistent with the dust attachment degree of the current outdoor heat exchanger.
Of course, the same control parameters for deep self-cleaning as those for moderate self-cleaning are only a preferred embodiment, and in other embodiments, those skilled in the art may also adjust the control parameters for deep self-cleaning to achieve better deep self-cleaning effect. For example, the deep self-cleaning mode may be operated for only one cycle, and the third preset temperature may be further decreased than the second preset temperature, the fifth or sixth preset time period may be increased than the third or fourth preset time period, and so on.
In one possible embodiment, the deep self-cleaning mode further comprises: after the step of controlling the air conditioner to switch to the cooling mode, controlling the compressor to adjust to the maximum limit frequency corresponding to the outdoor environment temperature.
In one possible embodiment, the deep self-cleaning mode further comprises: before the opening degree of the throttling device is adjusted, the outdoor fan is controlled to operate at the lowest rotating speed, and the indoor fan is controlled to operate at a third preset rotating speed. Specifically, in the deep self-cleaning mode, before the opening degree of the throttling device is adjusted, the outdoor fan is controlled to operate at the lowest rotating speed to reduce the heat exchange effect between the outdoor heat exchanger and air, so that the reduction speed of the temperature of the outdoor coil pipe can be increased, and the self-cleaning efficiency in the pipe is improved. The third preset rotating speed can be the highest rotating speed of the indoor fan in the application, and the heat exchange effect between the refrigerant and the environment in the indoor heat exchanger can be improved by controlling the indoor fan to operate at the highest rotating speed before the opening of the throttling device is adjusted because the filth blockage of the outdoor heat exchanger is serious, so that the temperature and the pressure of the refrigerant are reduced, the evaporation effect of the refrigerant in the outdoor heat exchanger is improved, and the outdoor coil is reduced to the third preset temperature at a higher speed.
In one possible embodiment, the deep self-cleaning mode further comprises: and after controlling the air conditioner to be switched into the cooling mode, controlling the indoor fan to stop running. Specifically, when the refrigeration mode is operated, the outlet air temperature of the indoor unit is gradually reduced, and poor use experience can be brought to users. At this moment, the operation of the indoor fan is stopped after 30s, so that the influence on user experience caused by too low air outlet temperature can be avoided. Of course, the person skilled in the art can adjust the above 30s, for example, to any value within 10s-1 min.
In one possible embodiment, the method further comprises: when the air conditioner enters the deep self-cleaning mode, the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed, but other protection functions of the air conditioner are opened as usual. The purpose and implementation of this step are the same as in the light cleaning mode, and therefore are not described in detail.
Of course, the specific control process of the deep self-cleaning mode is not exclusive, and the control mode can be adjusted by those skilled in the art. For example, one or more of the operating frequency of the compressor, the opening degree of the electronic expansion valve, the rotational speed of the indoor fan, and the rotational speed of the outdoor fan in the above control method may be omitted on the premise that the coil temperature of the outdoor heat exchanger can be maintained at the third preset temperature or lower. For another example, after the air conditioner is controlled to switch to the cooling mode, no adjustment may be made to the throttle device.
In one possible embodiment, the method further comprises: and after the second on-off valve is opened again for the seventh preset time, the deep self-cleaning mode is exited, and the air conditioner is controlled to be restored to the running state before the deep self-cleaning mode is entered. When the second on-off valve is opened for the seventh preset time period for the second time, a better defrosting effect can be generated, and therefore the deep self-cleaning mode can be quitted when the second on-off valve is opened again for the seventh preset time period.
In this application, the same control method as the above-mentioned method for exiting the mild self-cleaning mode may be adopted to achieve the purpose of exiting the deep self-cleaning mode, and details are not described herein again.
Of course, the manner of exiting the deep self-cleaning mode is not limited to the same manner as exiting the light self-cleaning mode, and a person skilled in the art may freely select a specific control manner without departing from the principles of the present application, provided that the air conditioner can be restored to the operation state before entering the deep self-cleaning mode. For example, the outdoor fan may be controlled to return to an operation state before entering the deep self-cleaning mode; for another example, the indoor fan may be controlled to be turned off, and then the indoor fan may be controlled to start operation after the temperature of the coil of the indoor heat exchanger is obtained to be raised to the temperature suitable for the heating mode. For another example, the components of the air conditioner may be controlled to directly return to the operating parameters before entering the deep self-cleaning mode.
Generally speaking, three kinds of outside of tubes self-cleaning modes of this application, through control air conditioner operation heating mode earlier, and adjust throttling arrangement's aperture and make frosting on the surface of outdoor heat exchanger, then control air conditioner conversion and become the refrigeration mode, and open the second on-off valve or close first on-off valve and second on-off valve earlier and open second on-off valve and throttling arrangement when satisfying preset condition, utilize the high temperature high pressure refrigerant to carry out the high temperature defrosting with the coil pipe heat transfer of outdoor heat exchanger, make the dust attached to on the coil pipe surface drop along with the water that melts after the frost layer melts together, the refrigerant then the recovery pipeline directly returns inside the reservoir, realize the outside of tubes self-cleaning to outdoor heat exchanger. And the cleaning effect of the three external pipe self-cleaning modes is sequentially enhanced from a mild self-cleaning mode, a moderate self-cleaning mode to a deep self-cleaning mode, so that the cleaning effect is matched with the dust attaching effect, and the intelligent self-cleaning of the outdoor heat exchanger is realized.
In addition, through set up the recovery pipeline in the air conditioner, this application can utilize the recovery pipeline to shorten the circulation path of refrigerant in the self-cleaning in-process outside the tubes of carrying out outdoor heat exchanger, realizes high-temperature high pressure refrigerant and outdoor heat exchanger's high-efficient heat exchange, reduces along journey pressure drop, improves the self-cleaning effect outside the tubes.
One possible implementation of the present application is described below with reference to fig. 4. Fig. 4 is a logic diagram of a possible implementation process of the method for controlling the external self-cleaning of the outdoor heat exchanger according to the present application.
As shown in fig. 4, the air conditioner is turned on to perform a heating operation, and then the following operations are performed:
step S201 is executed first to obtain the actual voltage value U of the outdoor fan, the operating frequency f of the compressor, and the outdoor ambient temperature Tao.
Step S203 is performed next, and the actual rotation speed r of the outdoor fan is calculated based on the formula r = a × f + b × Tao + c.
Next, step S205 is executed to determine a theoretical voltage value Un corresponding to the actual rotation speed r, and calculate Δ U = | U-Un |.
And step S207 is executed to determine whether Δ U/Un is less than or equal to 1, if yes, the operation is ended, otherwise, if not, step S209 is executed, where Δ U = | U-Un |, un is a theoretical voltage value corresponding to the actual rotation speed of the outdoor fan, and U is an actual voltage value of the outdoor fan.
S209, judging whether 1 < [ delta ] U/Un is less than or equal to 1.1; if true, step S213 is performed, otherwise, if false, step S211 is performed.
S211, judging whether the 1.1 <. DELTA.U/Un is less than or equal to 1.5; if true, step S215 is performed, otherwise, if false, step S217 is performed.
And S213, executing a mild self-cleaning mode.
And S215, executing a moderate self-cleaning mode.
S217, executing a deep self-cleaning mode.
Those skilled in the art will appreciate that the above-described air conditioner may also include other known structures, such as a processor, a controller, a memory, etc., wherein the memory includes, but is not limited to, a random access memory, a flash memory, a read only memory, a programmable read only memory, a volatile memory, a non-volatile memory, a serial memory, a parallel memory or a register, etc., and the processor includes, but is not limited to, a CPLD/FPGA, a DSP, an ARM processor, a MIPS processor, etc. Such well-known structures are not shown in the drawings in order to not unnecessarily obscure embodiments of the present disclosure.
Although the foregoing embodiments describe the steps in a sequential manner, those skilled in the art can understand that, in order to achieve the effect of the present embodiment, different steps are not necessarily performed in such an order, and may be performed simultaneously (in parallel) or in an inverse order, and these simple variations are within the scope of the present application.
So far, the technical solutions of the present application 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 application 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 present application, and the technical scheme after the changes or substitutions will fall into the protection scope of the present application.
Claims (10)
1. An external pipe self-cleaning control method of an outdoor heat exchanger is applied to an air conditioner and is characterized in that the air conditioner comprises a compressor, a four-way valve, an indoor heat exchanger, a throttling device and an outdoor heat exchanger which are sequentially connected through a refrigerant pipeline, the outdoor heat exchanger is provided with an outdoor fan, the air conditioner also comprises a recovery pipeline, a first on-off valve and a second on-off valve, the first on-off valve is arranged on the refrigerant pipeline between the indoor heat exchanger and the throttling device, one end of the recovery pipeline is arranged on the refrigerant pipeline between the first on-off valve and the throttling device, the other end of the recovery pipeline is communicated with an air suction port of the compressor, the second on-off valve is arranged on the recovery pipeline,
the control method comprises the following steps:
acquiring the operating parameters of the outdoor fan;
judging the dust adhesion degree of the outdoor heat exchanger based on the operation parameters;
executing a corresponding external self-cleaning mode based on the dust adhesion degree;
the degree of dust attachment includes light attachment, medium attachment, and heavy attachment, and the out-of-tube self-cleaning mode includes a light self-cleaning mode, a medium self-cleaning mode, and a deep self-cleaning mode;
the mild self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; controlling the compressor to adjust to a first self-cleaning frequency; adjusting the opening degree of the throttling device to enable the temperature of a coil of the outdoor heat exchanger to be less than or equal to a first preset temperature, so that frosting is achieved; when the temperature of the coil pipe is less than or equal to the first preset temperature and lasts for a first preset time, controlling the air conditioner to be switched into a refrigeration mode; controlling the second on-off valve to be opened, and the throttling device to be opened to a first preset opening degree, and continuing for a second preset time to realize defrosting;
the moderate self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; controlling the compressor to adjust to a second self-cleaning frequency; adjusting the opening degree of the throttling device to enable the temperature of a coil of the outdoor heat exchanger to be less than or equal to a second preset temperature, so that frosting is achieved; when the temperature of the coil pipe is less than or equal to the second preset temperature and lasts for a third preset time, controlling the air conditioner to be switched into a refrigeration mode; controlling the first on-off valve and the second on-off valve to close; when a first preset condition is met, the second on-off valve is controlled to be opened, the throttling device is controlled to be opened to a second preset opening degree, and the fourth preset time is continued, so that defrosting is realized;
the deep self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; controlling the compressor to adjust to a third self-cleaning frequency; adjusting the opening degree of the throttling device to enable the temperature of a coil of the outdoor heat exchanger to be less than or equal to a third preset temperature, and achieving frosting; when the temperature of the coil pipe is less than or equal to the third preset temperature and lasts for a fifth preset time, controlling the air conditioner to be switched into a refrigeration mode; controlling the first on-off valve and the second on-off valve to close; when a second preset condition is met, the second cut-off valve is controlled to be opened, and the throttling device is controlled to be opened to a third preset opening degree; after lasting for a sixth preset time, controlling the second cut-off valve to be closed; and when the second preset condition is met again, controlling the second stop valve to be opened again, and continuing for a seventh preset time to realize defrosting.
2. The method of controlling self-cleaning outside of tubes of an outdoor heat exchanger according to claim 1,
the mild self-cleaning mode further comprises: after the air conditioner is controlled to be switched into a refrigeration mode, controlling the compressor to adjust to the maximum limit frequency corresponding to the outdoor environment temperature; and/or
After controlling the air conditioner to be switched into a refrigeration mode, controlling an indoor fan to stop running; and/or
The mild self-cleaning mode further comprises: before the opening of the throttling device is adjusted, the outdoor fan is controlled to operate at the lowest wind speed, and the indoor fan is controlled to operate at a first preset rotating speed; and/or
The first preset opening degree is the maximum opening degree of the throttling device.
3. The method of controlling self-cleaning outside the tubes of an outdoor heat exchanger according to claim 2, further comprising:
and after the second on-off valve is opened and the throttle device is opened to the first preset opening degree for the second preset time, the air conditioner exits from the mild self-cleaning mode and is controlled to be restored to the running state before entering the mild self-cleaning mode.
4. The method of controlling self-cleaning outside of tubes of an outdoor heat exchanger according to claim 1,
the moderate self-cleaning mode further comprises: after the air conditioner is controlled to be switched into a refrigeration mode, controlling the compressor to adjust to the maximum limit frequency corresponding to the outdoor environment temperature; and/or
After controlling the air conditioner to be switched into a cooling mode, controlling an indoor fan to stop running; and/or
The moderate self-cleaning mode further comprises: before the opening of the throttling device is adjusted, the outdoor fan is controlled to operate at the lowest rotating speed, and the indoor fan is controlled to operate at a second preset rotating speed; and/or
The second preset opening degree is the maximum opening degree of the throttling device.
5. The method of controlling self-cleaning outside the tubes of an outdoor heat exchanger according to claim 4, further comprising:
and after the second cut-off valve is opened and the throttle device is opened to a second preset opening degree for the fourth preset time, the air conditioner exits from the moderate self-cleaning mode and is controlled to be restored to the running state before entering the moderate self-cleaning mode.
6. The method of controlling self-cleaning outside of tubes of an outdoor heat exchanger according to claim 1,
the deep self-cleaning mode further comprises: after the air conditioner is controlled to be switched into a refrigeration mode, controlling the compressor to adjust to the maximum limit frequency corresponding to the outdoor environment temperature; and/or
After controlling the air conditioner to be switched into a refrigeration mode, controlling an indoor fan to stop running; and/or
The deep self-cleaning mode further comprises: before the opening of the throttling device is adjusted, the outdoor fan is controlled to operate at the lowest rotating speed, and the indoor fan is controlled to operate at a third preset rotating speed; and/or
The third preset opening is the maximum opening of the throttling device.
7. The method of controlling self-cleaning outside the tubes of an outdoor heat exchanger according to claim 6, further comprising:
and after the second on-off valve is opened again for the seventh preset time, the deep self-cleaning mode is exited, and the air conditioner is controlled to be restored to the running state before the deep self-cleaning mode is entered.
8. The method of controlling self-cleaning outside the tubes of an outdoor heat exchanger according to claim 1, further comprising:
and when the device enters the external self-cleaning mode, closing the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function.
9. The method of claim 1, wherein the outdoor fan is a DC fan, the operating parameters include an actual speed and an actual voltage of the outdoor fan,
the step of "judging the degree of dust adhesion of the outdoor heat exchanger based on the operation parameter" further includes:
determining a theoretical voltage value corresponding to the actual rotating speed;
calculating the absolute value of the difference between the actual voltage value and the theoretical voltage value, and calculating the ratio of the absolute value of the difference to the theoretical voltage value;
when the ratio is greater than a first threshold value and less than or equal to a second threshold value, judging that the outdoor heat exchanger is slightly attached;
when the ratio is greater than the second threshold and less than or equal to a third threshold, judging that the outdoor heat exchanger is in the medium adhesion;
and when the ratio is larger than a third threshold value, judging that the outdoor heat exchanger is heavily attached.
10. The method of claim 1, wherein the outdoor fan is an AC fan, the operating parameters include an actual speed and an actual current of the outdoor fan,
the step of "judging the degree of dust adhesion of the outdoor heat exchanger based on the operation parameter" further includes:
determining a theoretical current value corresponding to the actual rotating speed;
calculating the absolute value of the difference value between the actual current value and the theoretical current value, and calculating the ratio of the absolute value of the difference value to the theoretical current value;
when the ratio is greater than a fourth threshold and less than or equal to a fifth threshold, judging that the outdoor heat exchanger is lightly adhered;
when the ratio is greater than the fifth threshold and less than or equal to a sixth threshold, judging that the outdoor heat exchanger is in the medium adhesion;
and when the ratio is larger than a sixth threshold value, judging that the outdoor heat exchanger is heavily attached.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110802943.6A CN113639411B (en) | 2021-07-15 | 2021-07-15 | Method for controlling external self-cleaning of outdoor heat exchanger |
| PCT/CN2021/129794 WO2023284193A1 (en) | 2021-07-15 | 2021-11-10 | Control method for implementing self-cleaning function outside of coiled pipe of outdoor heat exchanger |
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| CN202110802943.6A CN113639411B (en) | 2021-07-15 | 2021-07-15 | Method for controlling external self-cleaning of outdoor heat exchanger |
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| CN114110954B (en) * | 2021-11-29 | 2023-05-12 | 海信空调有限公司 | Self-cleaning control method for outdoor heat exchanger, air conditioner and computer storage medium |
| CN114608158B (en) * | 2022-02-18 | 2024-02-20 | 青岛海尔空调器有限总公司 | Method and device for controlling direct-current air conditioner and air conditioner |
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| WO2023284193A1 (en) | 2023-01-19 |
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