CN113531778B - Outside-tube self-cleaning control method of outdoor heat exchanger - Google Patents

Outside-tube self-cleaning control method of outdoor heat exchanger Download PDF

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Publication number
CN113531778B
CN113531778B CN202110777929.5A CN202110777929A CN113531778B CN 113531778 B CN113531778 B CN 113531778B CN 202110777929 A CN202110777929 A CN 202110777929A CN 113531778 B CN113531778 B CN 113531778B
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China
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self
heat exchanger
cleaning
outdoor heat
outdoor
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CN113531778A (en
Inventor
罗荣邦
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Priority to CN202110777929.5A priority Critical patent/CN113531778B/en
Publication of CN113531778A publication Critical patent/CN113531778A/en
Priority to PCT/CN2021/129802 priority patent/WO2023279611A1/en
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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
    • 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
    • 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
    • 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
    • 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
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G15/00—Details
    • F28G15/003—Control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • 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 self-cleaning of air conditioners, in particular to an external self-cleaning control method of an outdoor heat exchanger. The self-cleaning control method aims at solving the problem that the existing self-cleaning control method cannot control the self-cleaning degree according to the dirt degree of the outdoor coil. For this purpose, the air conditioner of this application includes the recovery pipeline, and its one end communicates with outdoor heat exchanger import, and the other end communicates with the compressor induction port, is equipped with the on-off valve on the recovery pipeline. The control method comprises the following steps: acquiring operation parameters of an outdoor fan; judging the dust adhesion degree of the outdoor heat exchanger based on the operation parameters; based on the dust adhesion degree, executing a corresponding out-of-pipe self-cleaning mode; the dust adhering degree includes light adhesion, moderate adhesion, and heavy adhesion, and the out-of-pipe self-cleaning mode includes a light self-cleaning mode, a moderate self-cleaning mode, and a deep self-cleaning mode. According to the self-cleaning mode outside the pipe, which is matched with the outdoor heat exchanger, can be executed based on the dust adhesion degree of the outdoor heat exchanger, so that more intelligent self-cleaning outside the pipe is realized.

Description

Outside-tube self-cleaning control method of outdoor heat exchanger
Technical Field
The invention relates to the technical field of self-cleaning of air conditioners, in particular to an external self-cleaning control method of an outdoor heat exchanger.
Background
The existing air conditioner part has the self-cleaning function of the inner machine and the outer machine. Taking the self-cleaning process of the outdoor heat exchanger as an example, when the self-cleaning function is executed, the frosting and defrosting operation of the outdoor coil is realized through the mode switching of cooling and heating, so that dirt attached to the outdoor coil is flushed away when the frost layer is melted.
However, the current air conditioner is fixed in a cleaning mode after entering a self-cleaning mode, and the self-cleaning degree cannot be intelligently controlled according to the dirt condition of the outdoor coil, so that the self-cleaning time is long when the dirt condition of the outer surface of the outdoor coil is light, the normal experience of a user is influenced, and the self-cleaning is not thorough when the dirt condition of the outer surface of the outdoor coil is serious.
Accordingly, there is a need in the art for a new off-tube self-cleaning control method for an outdoor heat exchanger to address the above-described problems.
Disclosure of Invention
In order to solve at least one of the problems in the prior art, namely to solve the problem that the existing self-cleaning control method cannot control the self-cleaning degree according to the dirt degree of an outdoor coil, the application provides an outdoor self-cleaning control method for an outdoor heat exchanger, which is applied to an air conditioner, wherein the air conditioner comprises a compressor, a four-way valve, an indoor heat exchanger, a throttling device and the outdoor heat exchanger which are connected through refrigerant pipelines, the outdoor heat exchanger is provided with an outdoor fan, the air conditioner further comprises a recovery pipeline, one end of the recovery pipeline is communicated with an inlet of the outdoor heat exchanger, the other end of the recovery pipeline is communicated with an air suction port of the compressor, the recovery pipeline is provided with an on-off valve, the on-off valve is a normally closed valve,
The control method comprises the following steps:
acquiring the operation parameters of the outdoor fan;
judging the dust adhesion degree of the outdoor heat exchanger based on the operation parameters;
based on the dust adhesion degree, executing a corresponding out-of-tube self-cleaning mode;
the dust adhering degree comprises light adhering, medium adhering and heavy adhering, and the out-pipe self-cleaning mode comprises a light self-cleaning mode, a medium self-cleaning mode and a deep self-cleaning mode;
the light 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; the opening degree of the throttling device is regulated so that the temperature of a coil pipe of the outdoor heat exchanger is smaller than or equal to a first preset temperature, and frosting is achieved; when the temperature of the coil pipe is smaller than or equal to the first preset temperature and lasts for a first preset time period, the air conditioner is controlled to be converted into a refrigeration mode; controlling the on-off valve to be opened, and the throttling device to be closed to the minimum opening, and continuously maintaining the second preset time length to realize defrosting;
the medium 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; the opening degree of the throttling device is regulated so that the temperature of a coil pipe of the outdoor heat exchanger is smaller than or equal to a second preset temperature, and frosting is achieved; when the temperature of the coil pipe is smaller than or equal to the second preset temperature and lasts for a third preset time period, the air conditioner is controlled to be converted into a refrigeration mode; controlling the on-off valve to be opened, and the throttling device to be closed to the minimum opening, and continuously maintaining the fourth preset time length to realize defrosting;
The deep self-cleaning mode includes: the following steps were repeated twice: controlling the air conditioner to operate in a heating mode; controlling the compressor to adjust to a third self-cleaning frequency; the opening degree of the throttling device is regulated so that the temperature of a coil pipe of the outdoor heat exchanger is smaller than or equal to a third preset temperature, and frosting is achieved; when the temperature of the coil pipe is smaller than or equal to the third preset temperature and lasts for a fifth preset duration, the air conditioner is controlled to be converted into a refrigeration mode; and controlling the on-off valve to be opened, and controlling the throttling device to be closed to the minimum opening, and continuing the sixth preset duration to realize defrosting.
In the preferable technical scheme of the method for controlling the self-cleaning outside the pipe of the outdoor heat exchanger, the light self-cleaning mode further includes: after the air conditioner is controlled to be converted into a refrigerating mode, controlling the compressor to adjust to the highest limit frequency corresponding to the outdoor environment temperature; and/or
The light self-cleaning mode further includes: before the opening degree of the throttling device is regulated, the outdoor fan is controlled to operate at the lowest wind speed, and the indoor fan is controlled to operate at the first preset rotating speed.
In the preferable technical scheme of the external self-cleaning control method of the outdoor heat exchanger, the control method further comprises the following steps:
And after the on-off valve is opened and the throttling device is closed to the minimum opening for the second preset time, the air conditioner is withdrawn from the slight self-cleaning mode, and is controlled to return to the running state before entering the slight self-cleaning mode.
In the preferable technical scheme of the method for controlling the self-cleaning outside the pipe of the outdoor heat exchanger, the moderate self-cleaning mode further comprises: after the air conditioner is controlled to be converted into a refrigerating mode, controlling the compressor to adjust to the highest limit frequency corresponding to the outdoor environment temperature; and/or
The medium self-cleaning mode further includes: before the opening degree of the throttling device is regulated, the outdoor fan is controlled to operate at the lowest rotating speed, and the indoor fan is controlled to operate at the second preset rotating speed.
In the preferable technical scheme of the external self-cleaning control method of the outdoor heat exchanger, the control method further comprises the following steps:
and after the on-off valve is opened and the throttling device is closed to the minimum opening for the fourth preset time, the air conditioner is withdrawn from the medium self-cleaning mode, and is controlled to return to the running state before entering the medium self-cleaning mode.
In the preferable technical scheme of the method for controlling the self-cleaning outside the pipe of the outdoor heat exchanger, the deep self-cleaning mode further includes: after the air conditioner is controlled to be converted into a refrigerating mode, controlling the compressor to adjust to the highest limit frequency corresponding to the outdoor environment temperature; and/or
The deep self-cleaning mode further includes: before the opening degree of the throttling device is regulated, controlling the outdoor fan to operate at the lowest rotating speed, and controlling the indoor fan to operate at a third preset rotating speed;
the deep self-cleaning mode further includes: and after the on-off valve is controlled to be opened for the first time and the sixth preset time period is continued, the air conditioner is controlled to operate in a heating mode and the seventh preset time period is continued.
In the preferable technical scheme of the external self-cleaning control method of the outdoor heat exchanger, the control method further comprises the following steps:
and after the second on-off valve is opened and the throttling device is closed to the minimum opening for the sixth preset time, the deep self-cleaning mode is exited, and the air conditioner is controlled to recover to the running state before entering the deep self-cleaning mode.
In the preferable technical scheme of the external self-cleaning control method of the outdoor heat exchanger, the control method further comprises the following steps:
When the self-cleaning mode outside the pipe 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 method for controlling the self-cleaning of the outside of the pipe 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 rotation speed;
calculating the absolute value of the difference between the actual voltage value and the theoretical voltage value, and calculating the ratio between the absolute value of the difference and the theoretical voltage value;
when the ratio is greater than a first threshold and less than or equal to a second threshold, 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 the moderate adhesion;
when the ratio is greater than a third threshold.
In the preferable technical scheme of the method for controlling the self-cleaning of the outside of the pipe 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 rotation speed;
calculating the absolute value of the difference between the actual current value and the theoretical current value, and calculating the ratio between the absolute value of the difference and the theoretical current value;
when the ratio is greater than a fourth threshold and less than or equal to a fifth threshold, determining that the outdoor heat exchanger is lightly attached;
when the ratio is greater than the fifth threshold and less than or equal to a sixth threshold, determining that the outdoor heat exchanger is the moderate adhesion;
and when the ratio is greater than a sixth threshold, judging that the outdoor heat exchanger is heavily attached.
Through judging the dust adhesion degree of outdoor heat exchanger according to the operating parameter of outdoor fan, then operate different outside pipe self-cleaning modes based on dust adhesion degree, the control method of this application not only can realize the outside self-cleaning to outdoor heat exchanger, but also can carry out assorted outside self-cleaning mode based on the dust adhesion degree of outdoor heat exchanger, realizes the outside self-cleaning of more intelligence.
Drawings
An off-pipe self-cleaning control method of the outdoor heat exchanger of the present application is described below with reference to the accompanying drawings.
In the accompanying 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 an air conditioner of the present application in a cooling mode;
FIG. 3 is a flow chart of an off-tube self-cleaning control method of the outdoor heat exchanger of the present application;
fig. 4 is a logic diagram of one possible implementation of the method of self-cleaning control of the outside of the tube of the outdoor heat exchanger of the present application.
List of reference numerals
1. A compressor; 2. a four-way valve; 3. an outdoor heat exchanger; 4. a throttle device; 5. an indoor heat exchanger; 6. a refrigerant pipe; 7. a recovery pipeline; 8. an on-off valve; 9. a reservoir; 10. an indoor fan; 11. an outdoor fan.
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 merely 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 details of the method of the present application, those skilled in the art may combine, split and exchange the sequence of the steps without departing from the basic principles of the present application, and the technical solution thus modified does not change the basic concepts of the present application, and therefore falls within the 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," "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 and limited otherwise, the term "coupled" is to be interpreted broadly, e.g., as a fixed connection, as a removable connection, or as an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those skilled in the art as the case may be.
First, with reference to fig. 1, a 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 application 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 outdoor heat exchanger 3, a throttling device 4, an indoor heat exchanger 5, and a liquid reservoir 9, the indoor heat exchanger 5 is configured with an indoor fan 10, the outdoor heat exchanger 3 is configured with an outdoor fan 11, the indoor fan 10 may be a through-flow fan, an axial-flow fan or a centrifugal fan, and the outdoor fan 11 may be an axial-flow fan or a centrifugal fan. The exhaust port of the compressor 1 is communicated with the P interface of the four-way valve 2 through a refrigerant pipeline 6, the E interface of the four-way valve 2 is communicated with the inlet of the indoor heat exchanger 5 through the refrigerant pipeline 6, the outlet of the indoor heat exchanger 5 is communicated with one port of the throttling device 4 through the refrigerant pipeline 6, the other port of the throttling device 4 is communicated with the inlet of the outdoor heat exchanger 3 through the refrigerant pipeline 6, the outlet of the outdoor heat exchanger 3 is communicated with the C interface of the four-way valve 2 through the refrigerant pipeline 6, the S interface of the four-way valve 2 is communicated with the inlet of the liquid accumulator 9 through the refrigerant pipeline 6, and the outlet of the liquid accumulator 9 is communicated with the air suction port of the compressor 1 through a pipeline. The throttling device 4 is an electronic expansion valve, a filter screen is arranged in the liquid reservoir 9, and the liquid reservoir 9 can play roles in storing refrigerants, separating refrigerant gas and liquid, filtering greasy dirt, silencing, buffering the refrigerants and the like.
The air conditioner further comprises a recovery pipeline 7 and an on-off valve 8, wherein the recovery pipeline 7 adopts a copper pipe with a smooth inner wall, a first end of the copper pipe is arranged on a refrigerant pipeline 6 between the throttling device 4 and the inlet of the outdoor heat exchanger 3, and a second end of the copper pipe is arranged on the refrigerant pipeline 6 between the S interface of the four-way valve 2 and the inlet of the liquid accumulator 9. The on-off valve 8 is preferably a solenoid valve, which is a normally closed valve and is provided on the recovery line 7, and is communicatively connected to the controller of the air conditioner to receive the opening and closing signals issued by the controller. Of course, the on-off valve 8 may be an electronic control valve such as an electronic expansion valve.
The following method for controlling the self-cleaning of the outside of the tube of the outdoor heat exchanger of the present 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 can adjust the same, 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 of the outside of the tube of the outdoor heat exchanger of the present application will be described with reference to fig. 1, 2 and 3. Fig. 2 is a system diagram of the air conditioner in the cooling mode; fig. 3 is a flow chart of an off-tube self-cleaning control method of the outdoor heat exchanger of 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 dirt degree of the outdoor heat exchanger, the outdoor self-cleaning control method of the outdoor heat exchanger of the present application includes:
s101, acquiring operation parameters of an outdoor fan.
In a possible implementation manner, the operation parameters of the outdoor fan include an actual rotation 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 during the operation of the air conditioner. The above-mentioned methods for obtaining the operation parameters are all conventional in the art, and are not described herein.
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, so as to determine the dust adhesion degree of the outdoor heat exchanger.
S105, executing a corresponding out-pipe self-cleaning mode based on the dust attachment degree.
In a possible embodiment, the dust adhesion degree of the present application may be classified into light adhesion, medium adhesion and heavy adhesion, and accordingly, the out-of-pipe self-cleaning mode corresponds to each dust adhesion degree including a light self-cleaning mode, a medium self-cleaning mode and a deep self-cleaning mode. That is, when it is judged that the degree of dust adhesion of the outdoor heat exchanger is light adhesion, the air conditioner is controlled to perform a light self-cleaning mode; when judging that the dust adhesion degree of the outdoor heat exchanger is moderate adhesion, controlling the air conditioner to execute a moderate self-cleaning mode; when the dust adhering degree of the outdoor heat exchanger is judged to be heavy adhering, the air conditioner is controlled to execute the deep self-cleaning mode.
It can be seen that by judging the dust adhesion degree of the outdoor heat exchanger according to the operation parameters of the outdoor fan and then operating different self-cleaning modes outside the pipe based on the dust adhesion degree, the control method of the application not only can realize self-cleaning outside the pipe of the outdoor heat exchanger, but also can execute the self-cleaning mode outside the pipe of 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 self-cleaning outside the pipe is realized.
Several possible embodiments of the present application for determining the dust attachment degree of the outdoor heat exchanger according to the operation parameters of the air conditioner will be described below.
Example 1
In this embodiment, the outdoor fan is a dc fan, and the operation parameters include an actual rotation speed and an actual voltage value of the outdoor fan, and the actual rotation speed and the actual voltage value of the outdoor fan are obtained by obtaining the operation parameters of the outdoor fan. The method for obtaining the actual voltage value of the outdoor fan belongs to a conventional means in the field, and is not described herein. The actual rotation speed of the outdoor fan can be obtained by the following steps:
typically, the rotational speed of the indoor fan is set by the user himself or automatically, while the rotational speed of the outdoor fan is determined by the system according to the operating environment. In a possible embodiment, the rotational speed of the outdoor fan is determined by the frequency of the compressor and the outdoor ambient temperature. Specifically, the rotational 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 operation 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 experimentally, with the experimental procedure being approximately as follows: and adjusting the rotating speed of the outdoor fan according to the operating frequency of each compressor and the outdoor environment temperature to obtain the rotating speed of the outdoor fan when the outdoor heat exchanger exchanges heat better as the optimal rotating speed of the outdoor fan under the corresponding operating frequency of the compressor and the outdoor environment temperature. After the running frequency of the compressor and the outdoor environment temperature are regulated, a plurality of groups of test data of optimal rotating speeds are obtained, and specific numerical values of a, b and c are obtained through fitting the test data.
When the air conditioner is operated, the actual rotation speed of the outdoor fan is determined and adjusted in real time based on the operation frequency of the compressor and the outdoor environment temperature. Therefore, the actual rotation speed of the outdoor fan is obtained, namely, the current compressor running 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 rotation speed can also be directly read, and the actual rotation speed is obtained through a formula in the application, so that the following calculation and judgment processes are more convenient.
After the actual rotation speed and the actual voltage value of the outdoor fan are obtained, the step of judging the dust adhesion degree of the outdoor heat exchanger based on the operation parameters further comprises:
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 between the absolute value of the difference and 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 value and less than or equal to the third threshold value, judging that the outdoor heat exchanger is in medium adhesion; and when the ratio is greater than a third threshold, judging that the outdoor heat exchanger is seriously attached.
In one possible embodiment, the theoretical voltage value is determined based on experimentation. Specifically, for different actual rotational 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 is attached to the outdoor heat exchanger) respectively, and then the bus voltage value at each rotational speed is recorded as the theoretical voltage value of the outdoor fan at the actual rotational speed. In the actual operation process, the actual load of the outdoor fan changes due to dust adhesion on the outdoor heat exchanger, and when the actual rotating speed calculated according to the outdoor environment temperature and the operating frequency of the compressor is unchanged, if the rotating speed is still wanted to be reached, the air conditioner automatically adjusts 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 to the outdoor heat exchanger and the degree of dust adhesion can be determined by comparing the actual voltage value of the outdoor fan with the theoretical voltage value thereof.
For example, assume that the obtained theoretical voltage value corresponding to the actual rotation speed of the outdoor fan is Un, the actual voltage value of the outdoor fan is U, at this time, the absolute value Δu= |u-un| of the difference between the two values is calculated, then the ratio Δu/Un of the difference value Δu to the theoretical voltage value is calculated, and the range in which the ratio is located is determined. In the application, the first threshold, the second threshold and the third threshold are sequentially increased, wherein the first threshold is any value in the range of 0.9-1.05, the second threshold is any value in the range of 1.05-1.2, and the third threshold is any value in the range of 1.3-1.6. In the application, the first threshold value is 1, the second threshold value is 1.1, the third threshold value is 1.5, and if DeltaU/Un is less than or equal to 1, the dust adhesion degree of the outdoor heat exchanger is not high, and self-cleaning is not needed; if the U/Un is less than or equal to 1.1, the outdoor heat exchanger is considered to be lightly attached; if the delta U/Un of 1.1 < [ delta ] is less than or equal to 1.5, the outdoor heat exchanger is considered to be moderately attached; if DeltaU/Un > 1.5, the outdoor heat exchanger is considered to be heavily attached.
Example 2
In this embodiment, the outdoor fan is an ac fan, and the operation parameters include an actual rotation speed and an actual current value of the outdoor fan, and the actual rotation speed and the actual current value of the outdoor fan are obtained by obtaining the operation parameters of the outdoor fan. The method for obtaining the actual current value of the outdoor fan belongs to a conventional means in the field, and is not described herein. The actual rotation speed of the outdoor fan may be obtained by the same formula as that in embodiment 1, or may be obtained directly.
After the actual rotation speed and the actual current value of the outdoor fan are obtained, the step of "judging the dust adhesion degree of the outdoor heat exchanger based on the operation parameters" further includes:
determining a theoretical current value corresponding to the actual rotation speed; calculating the absolute value of the difference between the actual current value and the theoretical current value, and calculating the ratio of the absolute value of the difference to the theoretical current value; when the ratio is greater than the fourth threshold value and less than or equal to the fifth threshold value, judging that the outdoor heat exchanger is lightly attached; when the ratio is greater than the fifth threshold and less than or equal to the sixth threshold, judging that the outdoor heat exchanger is moderately attached; and when the ratio is greater than a sixth threshold, judging that the outdoor heat exchanger is seriously attached.
In one possible embodiment, the theoretical current value is determined based on experimentation. Specifically, for an ac fan, the voltage is a constant voltage, and for different actual rotational speeds of the outdoor fan (determined based on the above formula), the input current value at each rotational speed is recorded as the theoretical current value of the outdoor fan at the actual rotational speed under the same load (e.g., no dust adhering to the outdoor heat exchanger) respectively. In the actual running process, the actual load of the outdoor fan changes due to the adhesion of dust on the outdoor heat exchanger, and when the actual rotating speed calculated according to the formula is unchanged, if the rotating speed still wants 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 to the outdoor heat exchanger and the degree of dust adhesion 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, firstly calculating an absolute value Δi= |i-in| of a difference value between the two values, then calculating a ratio Δi/In of the difference value Δi and the theoretical current value, and judging a range In which the ratio is located. In the application, the fourth threshold value, the fifth threshold value and the sixth threshold value are sequentially increased, wherein the fourth threshold value is any value in the range of 0.9-1.05, the fifth threshold value is any value in the range of 1.05-1.2, and the sixth threshold value is any value in the range of 1.3-1.6. In the application, the fourth threshold value is 1, the fifth threshold value is 1.1, the sixth threshold value is 1.5, and if delta I/In is less than or equal to 1, the dust adhesion degree of the outdoor heat exchanger is not large, and self cleaning is not needed; if 1 < [ delta ] I/In is less than or equal to 1.1, 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 ΔI/In > 1.5, the outdoor heat exchanger is considered to be heavily attached.
The following describes a specific control procedure of the respective out-of-pipe self-cleaning modes of the present application.
In a possible embodiment, the light self-cleaning mode comprises: controlling an air conditioner to operate a heating mode; controlling the compressor to adjust to a first self-cleaning frequency; the opening degree of the throttling device is regulated so that the temperature of a coil pipe of the outdoor heat exchanger is smaller than or equal to a first preset temperature, and frosting of the outer surface of the coil pipe is realized; when the temperature of the coil pipe is smaller than or equal to the first preset temperature and lasts for a first preset time period, the air conditioner is controlled to be converted into a refrigeration mode; and controlling the on-off valve to be opened, and the throttling device to be closed to the minimum opening, and continuously maintaining the second preset time length to realize defrosting of the outer surface of the coil. In particular, the method comprises the steps of,
First, the air conditioner is controlled to operate in a heating mode. The switching between the operation modes of the air conditioner can be controlled by controlling the on-off of the four-way valve, for example, when the four-way valve is electrified, the air conditioner operates in a heating mode, and when the four-way valve is deenergized, the air conditioner operates in a cooling mode. In this embodiment, after entering the mild self-cleaning mode, if the air conditioner is operating in the heating mode, no adjustment is needed, and the air conditioner is controlled to continue to operate; if the air conditioner is operating in the non-heating mode, the air conditioner is controlled to switch to the heating mode.
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, for example, a correspondence relationship between the outdoor ambient temperature and the first self-cleaning frequency as in table 1 below. When the compressor is operated at the first self-cleaning frequency, it facilitates the implementation of the subsequent control process.
TABLE 1 outdoor ambient temperature and first self-cleaning frequency Table
Outdoor ambient temperature (DEG C) First self-cleaning frequency (Hz)
Tao≤-20 Outer ring temperature frequency limiting highest frequency-5
-20<Tao≤-10 Outer ring temperature frequency limiting highest frequency-5
-10<Tao≤-5 Outer ring temperature frequency limiting highest frequency-5
-5<Tao≤0 Outer ring temperature frequency limiting highest frequency
0<Tao≤5 Outer ring temperature frequency limiting highest frequency
5<Tao≤10 Outer ring temperature frequency limiting highest frequency +5
10<Tao≤16 Outer ring temperature frequency limiting highest frequency +5
Tao>16 Outer ring temperature frequency limiting highest frequency +5
And then, adjusting the opening degree of the throttling device to ensure that the temperature of the coil pipe of the outdoor heat exchanger is smaller than or equal to a first preset temperature, so as to realize frosting of the outer surface of the coil pipe. In a possible implementation manner, the temperature of the coil pipe of the outdoor heat exchanger can be detected through a temperature sensor, and the opening degree of the electronic expansion valve is dynamically adjusted, so that the temperature of the coil pipe of the outdoor heat exchanger is smaller than or equal to a first preset temperature. Because dust adheres to the outer surface of the outdoor heat exchanger, the outer surface of the coil pipe can be frosted after the temperature of the coil pipe is reduced to a certain temperature for a certain time. The first preset temperature of the present application may be set to-1 ℃ to-10 ℃, and in the present application, the first preset temperature may be-5 ℃. That is, the coil temperature of the outdoor heat exchanger is set to be equal to or lower than the first preset temperature for control purposes by adjusting the opening degree (such as PID adjustment, etc.) of the electronic expansion valve, so that the coil temperature of the outdoor heat exchanger is always in a state of equal to or lower than the first preset temperature.
Referring to fig. 1, when the air conditioner is operated in a heating mode, the coil temperature of the outdoor heat exchanger is maintained at-5 c or less, and at this time, frost is 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 equal to or less than the first preset temperature by adjusting the opening of the electronic expansion valve to a fixed opening.
And then, when the temperature of the coil pipe is less than or equal to the first preset temperature and lasts for a first preset time period, controlling the air conditioner to be converted into a refrigeration mode. The first preset time period may be any value from 5 to 15 minutes. Preferably, in this embodiment, the first preset time period is 10min, and when the temperature of the coil is equal to or less than-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 of the outdoor heat exchanger can be performed. 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, controlling the four-way valve to be powered off, and the air conditioner operates in the cooling mode.
And finally, controlling the on-off valve to be opened, and the throttling device to be closed to the minimum opening, and continuously maintaining the second preset duration to realize defrosting. The throttle device is controlled to be closed to the minimum opening, namely, the opening is 0, the throttle device realizes complete throttling, and the refrigerant cannot flow. The second preset time period may be any value from 3min to 10min, and is preferably 5min in the application. And when the operation mode is switched to the refrigeration mode, the on-off valve is controlled to be opened, the throttling device is controlled to be closed to the minimum opening, and the state is kept to be continuously operated for 5 minutes. At this time, as shown by an arrow in fig. 2, the high-temperature and high-pressure refrigerant discharged from the compressor flows through the outdoor heat exchanger, exchanges heat with the coil pipe of the outdoor heat exchanger, melts the frost layer on the outer surface of the outdoor heat exchanger, and dust attached to the outer surface of the outdoor heat exchanger flows away along with the melted water. The high-temperature refrigerant flows back to the liquid reservoir through the recovery pipeline, so that the aim of self-cleaning outside the pipe of the outdoor heat exchanger is fulfilled.
In a possible embodiment, the light 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 highest limit frequency corresponding to the outdoor environment temperature. In general, the operating frequency of the compressor is affected by the outdoor environment temperature, and cannot rise 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 highest limit frequency is correspondingly set at different outdoor environment temperatures. The method for obtaining the outdoor environment temperature is a conventional method in the art, and is not described herein.
In a possible embodiment, the light self-cleaning mode further comprises: before the opening degree of the throttling device is regulated, 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 light self-cleaning mode, therefore, before the opening degree of the throttling device is adjusted, the outdoor fan is controlled to run at the lowest rotation speed so as to reduce the heat exchange effect between the outdoor heat exchanger and the air, thereby being capable of accelerating the reduction speed of the temperature of the outdoor coil and improving the self-cleaning efficiency outside the pipe. The first preset rotating speed can be the low rotating speed of the rotating speeds of the indoor fans in the application, such as 400r/min-700r/min, the application can be 500r/min, and because dust of the outdoor heat exchanger is not seriously attached, and the indoor environment temperature is being regulated before the air conditioner enters the mild self-cleaning mode, the indoor fan is controlled to operate at the lowest rotating speed on the basis of guaranteeing the self-cleaning effect, and the indoor fan is controlled to operate at the first preset rotating speed, so that certain indoor comfort can be guaranteed.
In one possible embodiment, after the air conditioner is controlled to be switched to the cooling mode, the indoor fan is controlled to stop operating. Specifically, when the cooling mode is operated, the air outlet temperature of the indoor unit is gradually reduced, and bad use experience can be brought to a user. At this time, the indoor fan is controlled to stop running after running for 30 seconds, 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 to any value of 10s-1 min.
In a possible embodiment, the method further comprises: when the light self-cleaning mode is entered, the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed. Because the coil temperature 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 as to ensure the smooth execution of the method. However, other protection functions of the air conditioner are started as usual, such as compressor exhaust protection, current overload protection and the like, and the service life of the air conditioner is prevented from being adversely affected.
Of course, the specific control of the light self-cleaning mode is not exclusive and can be adjusted by those skilled in the art. For example, on the premise that the coil temperature of the outdoor heat exchanger can be kept at the first preset temperature or lower, one or more of the operation frequency of the compressor, the opening degree of the electronic expansion valve, the rotation speed of the indoor fan, and the rotation speed of the outdoor fan in the control manner described above may be omitted.
In a possible embodiment, the method further comprises: and after the on-off valve is opened and the throttling device is closed to the minimum opening for a second preset time, the air conditioner exits from the mild self-cleaning mode, and is controlled to recover to the running state before entering the mild self-cleaning mode. When the on-off valve is opened and the throttling device is closed for 5min, the high-temperature and high-pressure refrigerant is circulated for a plurality of times, so that defrosting operation is finished, and when the on-off valve is opened and the throttling device is closed to the minimum opening for 5min, the mild self-cleaning mode can be exited.
Specifically, the step of exiting the light self-cleaning mode further comprises: the air conditioner is controlled to recover to an operation mode before entering the mild self-cleaning mode, the compressor is controlled to recover to a 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 on-off valve is controlled to be closed. After the light self-cleaning mode is performed, the air conditioner needs to be restored to an operation mode before entering the light self-cleaning mode to continue to adjust the indoor temperature. Taking the air conditioner operation heating mode before entering the light self-cleaning mode as an example, after the light self-cleaning mode is executed, the operation needs to be switched back to the heating mode operation. At the moment, the four-way valve is controlled to be electrified to restore the heat mode, the compressor is controlled to restore the frequency from the highest limit value frequency to the frequency before the air conditioner enters the mild 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 keep the maximum opening degree, and the on-off valve is controlled to be closed, so that the refrigerant flows in the flow direction of the normal heating mode. Wherein, indoor fan opens and the aviation baffle of indoor set upwards supplies air, prevents because the air conditioner just changes when heating the mode into, and outdoor heat exchanger coil pipe temperature is too low and the air-out brings bad use experience for the user. The throttling device is opened to the maximum opening, and the refrigerant circulates between the compressor and the outdoor heat exchanger during the operation in the mild self-cleaning mode, so that the refrigerant in the indoor heat exchanger is lost, and therefore the throttling device keeps the maximum opening, so that the refrigerant rapidly fills the indoor heat exchanger, and the normal circulation of the refrigerant is realized as soon as possible.
Accordingly, after the indoor fan is controlled to be started and the air guide plate supplies air upwards for a first duration, the indoor fan and the air guide plate are controlled to be restored to the running state before entering the mild self-cleaning mode. The first duration time can be any value of 20s-1min, the application is preferably 30s, when 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 already reduced to a temperature matched with a heating mode, and at the moment, the indoor fan and the air deflector are controlled to restore to an operation mode before entering a light self-cleaning mode so as to meet the heating requirement of a user.
Accordingly, after the throttle is controlled to open to the maximum opening for the second duration, the throttle is controlled to resume the opening before the mild self-cleaning mode is entered. The second duration may be any value within 1min-5min, and in this application, preferably, 3min, after the electronic expansion valve keeps the maximum opening to operate for 3min, the refrigerant circulation has already tended to be stable, and at this time, the electronic expansion valve is controlled to recover to the opening before entering the light self-cleaning mode, so that the heating parameters before the air conditioner completely recovers to enter the light self-cleaning mode continue to operate.
Of course, the manner of exiting the light self-cleaning mode is not limited to the above, 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 light self-cleaning mode. For example, the outdoor fan may be controlled to resume its operating state prior to entering the light self-cleaning mode; for another example, the indoor fan may be controlled to be turned off first, and then the indoor fan is controlled to start to operate after the coil temperature of the outdoor heat exchanger is obtained to be reduced to a temperature suitable for the heating mode. For another example, the components of the air conditioner may be controlled to revert directly to the operating parameters prior to entering the light self-cleaning mode.
In a possible embodiment, the medium self-cleaning mode comprises: controlling an air conditioner to operate a heating mode; controlling the compressor to adjust to a second self-cleaning frequency; the opening degree of the throttling device is regulated so that the temperature of a coil pipe of the outdoor heat exchanger is smaller than or equal to a second preset temperature, and 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 period, the air conditioner is controlled to be converted into a refrigeration mode; and controlling the on-off valve to be opened, and the throttling device to be closed to the minimum opening, and continuously maintaining the fourth preset time length to realize defrosting. In particular, the method comprises the steps of,
First, the air conditioner is controlled to operate in a heating mode. Similar to the light self-cleaning mode described above, switching between the operation modes of the air conditioner can be controlled by controlling the on-off of the four-way valve. In this embodiment, after entering the moderate self-cleaning mode, if the air conditioner is operating in the heating mode, no adjustment is needed, and the air conditioner is controlled to continue to operate; if the air conditioner is operating in the non-heating mode, the air conditioner is controlled to switch to the heating mode.
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 the above table 1, and is not described herein again. When the compressor is operated at the second self-cleaning frequency, it facilitates the implementation of the subsequent control process.
And then, adjusting the opening degree of the throttling device to enable the temperature of the coil pipe of the outdoor heat exchanger to be smaller than or equal to a second preset temperature, so as to realize frosting of the outer surface of the coil pipe. Preferably, the second preset temperature is smaller than the first preset temperature, and in this application, the second preset temperature may be-10 ℃. That is, the coil temperature of the outdoor heat exchanger is set to be equal to or lower than the second preset temperature for control purposes, and the coil temperature of the outdoor heat exchanger is always set to be equal to or lower than the second preset temperature by adjusting the opening degree (such as PID adjustment and the like) of the electronic expansion valve. In this way, the outer surface of the coil can be frosted faster than in the light self-cleaning mode, and the thickness of the frost layer is thicker.
Referring to fig. 1, when the air conditioner is operated in a heating mode, the coil temperature of the outdoor heat exchanger is maintained in a state of-10 ℃ or less, at which time frost is formed on the 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 equal to or less than the second preset temperature by adjusting the opening of the electronic expansion valve to a fixed opening.
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 period, controlling the air conditioner to be converted into a refrigeration mode. The third preset time period may be any value from 5 to 15 minutes. Preferably, in this embodiment, the third preset time period is 10min, and when the temperature of the coil is equal to or less than-10 ℃ 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 of the outdoor heat exchanger can be performed. 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, controlling the four-way valve to be powered off, and the air conditioner operates in the cooling mode.
And finally, controlling the on-off valve to be opened, and the throttling device to be closed to the minimum opening, and continuously maintaining the fourth preset duration to realize defrosting. The throttle device is controlled to be closed to the minimum opening, namely, the opening is 0, the throttle device realizes complete throttling, and the refrigerant cannot flow. The fourth preset time period may be any value from 3min to 10min, and is preferably 5min in the application. And when the operation mode is switched to the refrigeration mode, the on-off valve is controlled to be opened, the throttling device is controlled to be closed to the minimum opening, and the state is kept to be continuously operated for 5 minutes. At this time, as shown by an arrow in fig. 2, the high-temperature and high-pressure refrigerant discharged from the compressor flows through the outdoor heat exchanger, exchanges heat with the coil pipe of the outdoor heat exchanger, melts the frost layer on the outer surface of the outdoor heat exchanger, and dust attached to the outer surface of the outdoor heat exchanger flows away along with the melted water. The high-temperature refrigerant flows back to the liquid reservoir through the recovery pipeline, so that the aim of self-cleaning outside the pipe of the outdoor heat exchanger is fulfilled.
In a possible embodiment, the medium 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 highest limit frequency corresponding to the outdoor environment temperature. In general, the operating frequency of the compressor is affected by the outdoor environment temperature, and cannot rise 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 highest limit frequency is correspondingly set at different outdoor environment temperatures. The method for obtaining the outdoor environment temperature is a conventional method in the art, and is not described herein.
In a possible embodiment, the medium self-cleaning mode further comprises, before adjusting the opening degree of the throttle device, controlling the outdoor fan to operate at a minimum rotational speed and controlling the indoor fan to operate at a second preset rotational speed. Specifically, in the medium 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 so as to reduce the heat exchange effect between the outdoor heat exchanger and the air, thereby accelerating the temperature reduction speed of the outdoor coil pipe and improving the self-cleaning efficiency outside the pipe. The second preset rotating speed can be the highest rotating speed of the indoor fan in the application, and because dust of the outdoor heat exchanger is adhered seriously, before the opening degree of the throttling device is adjusted, the indoor fan is controlled to operate at the highest rotating speed, so that the heat exchange effect between the refrigerant and the environment in the indoor heat exchanger can be improved, 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 second preset temperature at a faster speed.
In one possible embodiment, after the air conditioner is controlled to be switched to the cooling mode, the indoor fan is controlled to stop operating. Specifically, when the cooling mode is operated, the air outlet temperature of the indoor unit is gradually reduced, and bad use experience can be brought to a user. At this time, the indoor fan is controlled to stop running after running for 30 seconds, 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 to any value of 10s-1 min.
In a possible embodiment, the method further comprises: when the air conditioner enters a 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 thus will not be described again.
Of course, the specific control procedure of the medium self-cleaning mode is not exclusive, and the control manner thereof can be adjusted by those skilled in the art. For example, on the premise that the coil temperature of the outdoor heat exchanger can be kept at the second preset temperature or lower, one or more of the operation frequency of the compressor, the opening degree of the electronic expansion valve, the rotation speed of the indoor fan, and the rotation speed of the outdoor fan in the control manner described above may be omitted.
In a possible embodiment, the method further comprises: and after the on-off valve is opened and the throttling device is closed to the minimum opening degree for a fourth preset time period, the air conditioner is controlled to recover to the running state before entering the medium self-cleaning mode after exiting the medium self-cleaning mode. When the opening time of the throttling device and the on-off valve lasts for 5min, the high-temperature and high-pressure refrigerant is circulated for a plurality of times, so that the operation of generating frost is enough, and when the throttling device and the on-off valve are opened for 5min, the medium self-cleaning mode can be exited.
In the present application, the same control method as that used for exiting the mild self-cleaning mode may be used to achieve the purpose of exiting the moderate self-cleaning mode, which is not described herein.
Of course, the mode of exiting the medium self-cleaning mode is not limited to the same method as exiting the light self-cleaning mode, and a person skilled in the art may freely select a specific control mode on the premise of enabling the air conditioner to return to the operation state before entering the medium self-cleaning mode, which does not deviate from the principle of the present application. For example, the outdoor fan may be controlled to resume an operating state prior to entering the neutral self-cleaning mode; for another example, the indoor fan may be controlled to be turned off first, and then the indoor fan may be controlled to start to operate after the temperature of the coil pipe of the indoor heat exchanger is obtained to rise to a temperature suitable for the heating mode. For another example, the components of the air conditioner may be controlled to revert directly to the operating parameters prior to entering the medium self-cleaning mode.
In a possible embodiment, the deep self-cleaning mode includes: the following steps were repeated twice: controlling an air conditioner to operate a heating mode; controlling the compressor to adjust to a third self-cleaning frequency; the opening degree of the throttling device is regulated so that the temperature of a coil pipe of the outdoor heat exchanger is smaller than or equal to a third preset temperature, and frosting is achieved; when the temperature of the coil pipe is smaller than or equal to the third preset temperature and lasts for a fifth preset time period, the air conditioner is controlled to be converted into a refrigeration mode; and controlling the on-off valve to be opened, and the throttling device to be closed to the minimum opening, and continuing the sixth preset duration to realize defrosting. In particular, the method comprises the steps of,
preferably, the operation parameters of deep self-cleaning in the present application may be the same as those of moderate self-cleaning, that is, the parameters of the third self-cleaning frequency, the third preset temperature, the fifth preset time period, the sixth preset time period, and the like are the same as those of moderate self-cleaning. In other words, in the present application, deep self-cleaning is a moderate self-cleaning mode of two continuous runs. And the specific control process of the moderate self-cleaning mode is not described herein.
In particular, the deep self-cleaning mode of the present application further includes: and after the on-off valve is controlled to be opened for the first time and the throttling device is closed to the minimum opening and the sixth preset time period is continued, the air conditioner is controlled to operate in a heating mode and the seventh preset time period is continued. In the application, because the air conditioner operates the heating mode before entering the deep self-cleaning mode, and the indoor fan is in a stop operation state in the deep self-cleaning mode execution process, and the deep self-cleaning mode execution time is longer, the indoor temperature fluctuation can be caused to be larger in the whole execution process, and poor experience is provided for users. Therefore, the method and the device control the air conditioner to operate the heating mode for a period of time before the two cycles of the deep self-cleaning mode are completed, namely after the control mode of the medium self-cleaning mode is executed for the first time, adjust the indoor environment temperature and avoid the occurrence of large fluctuation of the indoor environment temperature. The seventh preset time period may be any value of 20-40min, which may be 30min in the present application. In addition, the operation heating mode can directly recover the parameter operation before entering the deep self-cleaning mode, and can also additionally set the operation parameter operation, so that the operation heating mode can be flexibly selected by a person skilled in the art.
Of course, the same control parameters of the deep self-cleaning as those of the moderate self-cleaning are only a preferred embodiment, and in other embodiments, the control parameters of the deep self-cleaning can be adjusted by a person skilled in the art so as to achieve a better deep self-cleaning effect. For example, the deep self-cleaning mode may be run for only one cycle, and the third preset temperature may be further reduced as compared to the second preset temperature, the fifth or sixth preset time period may be increased as compared to the third or fourth preset time period, etc.
In a 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 highest limit frequency corresponding to the outdoor environment temperature.
In a possible embodiment, the deep self-cleaning mode further comprises: before the opening degree of the throttling device is regulated, the outdoor fan is controlled to operate at the lowest rotating speed, and the indoor fan is controlled to operate at the 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 firstly controlled to operate at the lowest rotating speed so as to reduce the heat exchange effect between the outdoor heat exchanger and the air, thereby being capable of accelerating the temperature reduction speed of the outdoor coil pipe and improving the self-cleaning efficiency in the pipe. The third preset rotating speed can be the highest rotating speed of the indoor fan in the application, and because the dirty blockage of the outdoor heat exchanger is serious, before the opening degree of the throttling device is regulated, the indoor fan is controlled to operate at the highest rotating speed, so that the heat exchange effect between the refrigerant and the environment in the indoor heat exchanger can be improved, 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 faster speed.
In a possible embodiment, the method further comprises: when the deep self-cleaning mode is entered, 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 thus will not be described again.
Of course, the specific control of the deep self-cleaning mode is not exclusive and can be adjusted by those skilled in the art. For example, on the premise that the coil temperature of the outdoor heat exchanger can be maintained at the third preset temperature or lower, one or more of the operation frequency of the compressor, the opening degree of the electronic expansion valve, the rotation speed of the indoor fan, and the rotation speed of the outdoor fan in the control manner described above may be omitted.
In a possible embodiment, the method further comprises: and after the state that the second on-off valve is opened and the throttling device is closed to the minimum opening degree lasts for a sixth preset time period, the deep self-cleaning mode is exited, and the air conditioner is controlled to recover to the running state before entering the deep self-cleaning mode. When the air conditioner runs for two times continuously with the parameters of moderate self-cleaning, a better defrosting effect is generated, so that the deep self-cleaning mode can be exited when the second throttling device and the on-off valve are opened for a sixth preset time.
In this application, the same control method as that used for exiting the light self-cleaning mode may be used to achieve the purpose of exiting the deep self-cleaning mode, which is not described herein.
Of course, the mode of exiting the deep self-cleaning mode is not limited to the same method as exiting the light self-cleaning mode, and a person skilled in the art may freely select a specific control mode on the premise of enabling the air conditioner to return to the operation state before entering the deep self-cleaning mode, which does not deviate from the principle of the present application. For example, the outdoor fan may be controlled to resume an operating state before entering the deep self-cleaning mode; for another example, the indoor fan may be controlled to be turned off first, and then the indoor fan may be controlled to start to operate after the temperature of the coil pipe of the indoor heat exchanger is obtained to rise to a temperature suitable for the heating mode. For another example, the components of the air conditioner may be controlled to revert directly to the operating parameters prior to entering the deep self-cleaning mode.
In general, the three pipe outer self-cleaning modes of the outdoor heat exchanger are operated by controlling the air conditioner to operate the heating mode firstly, adjusting the opening of the throttling device to enable frosting on the outer surface of the outdoor heat exchanger, controlling the air conditioner to convert into the refrigerating mode, opening the on-off valve, closing the throttling device, performing high-temperature frosting by utilizing high-temperature and high-pressure refrigerants to exchange heat with the coil pipe of the outdoor heat exchanger, enabling dust attached to the outer surface of the coil pipe to fall along with melting water after melting of a frost layer, and enabling the refrigerant to directly return to the inside of the liquid reservoir through a recovery pipeline, so that the pipe outer self-cleaning of the outdoor heat exchanger is realized. And moreover, the cleaning effect of the three self-cleaning modes outside the pipe is sequentially enhanced from mild, moderate to deep, 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 setting up the recovery pipeline in the air conditioner, this application can be in carrying out the outer automatically cleaning in-process of pipe to the outdoor heat exchanger, utilizes the recovery pipeline to shorten the circulation path of refrigerant, realizes the high-efficient heat exchange of high temperature high pressure refrigerant and outdoor heat exchanger, reduces along the journey pressure drop, improves the outer automatically cleaning effect of pipe.
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 procedure of the method for controlling the self-cleaning outside the tube of the outdoor heat exchanger of the present application.
As shown in fig. 4, the air conditioner is turned on to perform a heating operation, and then performs the following operations:
first, step S201 is performed to obtain an actual voltage value U of the outdoor fan, an operating frequency f of the compressor, and an outdoor ambient temperature Tao.
Next, step S203 is executed to calculate the actual rotation speed r of the outdoor fan based on the formula r=a×f+b×tao+c.
Next, step S205 is performed, in which a theoretical voltage value Un corresponding to the actual rotation speed r is determined based on the actual rotation speed r, and Δu= |u-un| is calculated.
Next, step S207 is executed to determine whether the cumulative time Δu/Un is equal to or less than 1, and when this is true, the operation is ended, otherwise, when this is not true, step S209 is executed.
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 delta U/Un of 1.1 < [ delta ] is less than or equal to 1.5; if true, step S215 is performed, otherwise, if false, step S217 is performed.
S213, a light self-cleaning mode is performed.
S215, a moderate self-cleaning mode is performed.
S217, a deep self-cleaning mode is executed.
It will be appreciated by those skilled in the art that the above-described air conditioner also includes some other well-known structure, 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, DSP, ARM processor, a MIPS processor, etc. These well-known structures are not shown in the drawings in order to not unnecessarily obscure the embodiments of the disclosure.
Although the steps are described in the above-described sequential order in the above-described embodiments, it will be appreciated by those skilled in the art that, in order to achieve the effects of the present embodiments, the steps need not be performed in such order, and may be performed simultaneously (in parallel) or in reverse order, and these simple variations are within the scope of the present application.
Thus far, the technical solution of the present application has 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 protection of the present application is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present application, and such modifications and substitutions will be within the scope of the present application.

Claims (10)

1. The self-cleaning control method for the outside of the pipe of the 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 the outdoor heat exchanger which are connected through a refrigerant pipeline, the outdoor heat exchanger is provided with an outdoor fan, the air conditioner also comprises a recovery pipeline, one end of the recovery pipeline is communicated with an inlet of the outdoor heat exchanger, the other end of the recovery pipeline is communicated with an air suction port of the compressor, an on-off valve is arranged on the recovery pipeline, the on-off valve is a normally closed valve,
the control method comprises the following steps:
acquiring the operation parameters of the outdoor fan;
judging the dust adhesion degree of the outdoor heat exchanger based on the operation parameters;
Based on the dust adhesion degree, executing a corresponding out-of-tube self-cleaning mode;
the dust adhering degree comprises light adhering, medium adhering and heavy adhering, and the out-pipe self-cleaning mode comprises a light self-cleaning mode, a medium self-cleaning mode and a deep self-cleaning mode;
the light 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; the opening degree of the throttling device is regulated so that the temperature of a coil pipe of the outdoor heat exchanger is smaller than or equal to a first preset temperature, and frosting is achieved; when the temperature of the coil pipe is smaller than or equal to the first preset temperature and lasts for a first preset time period, the air conditioner is controlled to be converted into a refrigeration mode; controlling the on-off valve to be opened, and the throttling device to be closed to the minimum opening, and continuously maintaining the second preset time length to realize defrosting;
the medium 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; the opening degree of the throttling device is regulated so that the temperature of a coil pipe of the outdoor heat exchanger is smaller than or equal to a second preset temperature, and frosting is achieved; when the temperature of the coil pipe is smaller than or equal to the second preset temperature and lasts for a third preset time period, the air conditioner is controlled to be converted into a refrigeration mode; controlling the on-off valve to be opened, and the throttling device to be closed to the minimum opening, and continuously maintaining the fourth preset time length to realize defrosting;
The deep self-cleaning mode includes: the following steps were repeated twice: controlling the air conditioner to operate in a heating mode; controlling the compressor to adjust to a third self-cleaning frequency; the opening degree of the throttling device is regulated so that the temperature of a coil pipe of the outdoor heat exchanger is smaller than or equal to a third preset temperature, and frosting is achieved; when the temperature of the coil pipe is smaller than or equal to the third preset temperature and lasts for a fifth preset duration, the air conditioner is controlled to be converted into a refrigeration mode; and controlling the on-off valve to be opened, and controlling the throttling device to be closed to the minimum opening, and continuing the sixth preset duration to realize defrosting.
2. The method for controlling the self-cleaning of the outside of a tube of an outdoor heat exchanger according to claim 1, wherein,
the light self-cleaning mode further includes: after the air conditioner is controlled to be converted into a refrigerating mode, controlling the compressor to adjust to the highest limit frequency corresponding to the outdoor environment temperature; and/or
After the air conditioner is controlled to be converted into a refrigerating mode, the indoor fan is controlled to stop running; and/or
The light self-cleaning mode further includes: before the opening degree of the throttling device is regulated, the outdoor fan is controlled to operate at the lowest wind speed, and the indoor fan is controlled to operate at the first preset rotating speed.
3. The out-of-pipe self-cleaning control method of an outdoor heat exchanger according to claim 2, characterized in that the control method further comprises:
and after the on-off valve is opened and the throttling device is closed to the minimum opening for the second preset time, the air conditioner is withdrawn from the slight self-cleaning mode, and is controlled to return to the running state before entering the slight self-cleaning mode.
4. The method for controlling the self-cleaning of the outside of a tube of an outdoor heat exchanger according to claim 1, wherein,
the medium self-cleaning mode further includes: after the air conditioner is controlled to be converted into a refrigerating mode, controlling the compressor to adjust to the highest limit frequency corresponding to the outdoor environment temperature; and/or
After the air conditioner is controlled to be converted into a refrigerating mode, the indoor fan is controlled to stop running; and/or
The medium self-cleaning mode further includes: before the opening degree of the throttling device is regulated, the outdoor fan is controlled to operate at the lowest rotating speed, and the indoor fan is controlled to operate at the second preset rotating speed.
5. The out-of-pipe self-cleaning control method of an outdoor heat exchanger according to claim 4, characterized in that the control method further comprises:
And after the on-off valve is opened and the throttling device is closed to the minimum opening for the fourth preset time, the air conditioner is withdrawn from the medium self-cleaning mode, and is controlled to return to the running state before entering the medium self-cleaning mode.
6. The method for controlling the self-cleaning of the outside of a tube of an outdoor heat exchanger according to claim 1, wherein,
the deep self-cleaning mode further includes: after the air conditioner is controlled to be converted into a refrigerating mode, controlling the compressor to adjust to the highest limit frequency corresponding to the outdoor environment temperature; and/or
After the air conditioner is controlled to be converted into a refrigerating mode, the indoor fan is controlled to stop running; and/or
The deep self-cleaning mode further includes: before the opening degree of the throttling device is regulated, controlling the outdoor fan to operate at the lowest rotating speed, and controlling the indoor fan to operate at a third preset rotating speed;
the deep self-cleaning mode further includes: and after the on-off valve is controlled to be opened for the first time and the sixth preset time period is continued, the air conditioner is controlled to operate in a heating mode and the seventh preset time period is continued.
7. The out-of-pipe self-cleaning control method of an outdoor heat exchanger according to claim 6, characterized in that the control method further comprises:
And after the second on-off valve is opened and the throttling device is closed to the minimum opening for the sixth preset time, the deep self-cleaning mode is exited, and the air conditioner is controlled to recover to the running state before entering the deep self-cleaning mode.
8. The out-of-pipe self-cleaning control method of an outdoor heat exchanger according to claim 1, characterized in that the control method further comprises:
when the self-cleaning mode outside the pipe is entered, the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed.
9. The method for controlling the self-cleaning of the outside of a tube of an outdoor heat exchanger according to claim 1, wherein the outdoor fan is a direct current fan, the operation parameters include an actual rotational speed and an 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 rotation speed;
calculating the absolute value of the difference between the actual voltage value and the theoretical voltage value, and calculating the ratio between the absolute value of the difference and the theoretical voltage value;
when the ratio is greater than a first threshold and less than or equal to a second threshold, 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 the moderate adhesion;
and when the ratio is greater than a third threshold, judging that the outdoor heat exchanger is heavily attached.
10. The method for controlling the self-cleaning of the outside of a tube of an outdoor heat exchanger according to claim 1, wherein the outdoor fan is an alternating current fan, the operation parameters include an actual rotational speed and an 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 rotation speed;
calculating the absolute value of the difference between the actual current value and the theoretical current value, and calculating the ratio between the absolute value of the difference and the theoretical current value;
when the ratio is greater than a fourth threshold and less than or equal to a fifth threshold, determining that the outdoor heat exchanger is lightly attached;
when the ratio is greater than the fifth threshold and less than or equal to a sixth threshold, determining that the outdoor heat exchanger is the moderate adhesion;
and when the ratio is greater than a sixth threshold, judging that the outdoor heat exchanger is heavily attached.
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