CN113654196B - Method for controlling self-cleaning in indoor heat exchanger - Google Patents
Method for controlling self-cleaning in indoor heat exchanger Download PDFInfo
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- CN113654196B CN113654196B CN202110801951.9A CN202110801951A CN113654196B CN 113654196 B CN113654196 B CN 113654196B CN 202110801951 A CN202110801951 A CN 202110801951A CN 113654196 B CN113654196 B CN 113654196B
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- 238000004140 cleaning Methods 0.000 title claims abstract description 147
- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000011084 recovery Methods 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 238000005057 refrigeration Methods 0.000 claims abstract description 17
- 239000003507 refrigerant Substances 0.000 claims description 73
- 230000002045 lasting effect Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 12
- 239000003921 oil Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 239000010721 machine oil Substances 0.000 description 4
- 230000008676 import Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000030279 gene silencing Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/43—Defrosting; Preventing freezing of indoor 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
-
- 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
- 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
- F24F11/83—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
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air conditioner self-cleaning, in particular to a method for controlling self-cleaning in a pipe of an indoor heat exchanger. This application aims at solving the problem of how to realize the intraductal automatically cleaning of indoor heat exchanger. To this end, the air conditioner of the present application is provided with a first on-off valve, a second on-off valve, and a recovery pipeline, and the control method includes: responding to a received instruction for carrying out self-cleaning in the pipe, and entering a self-cleaning mode in the pipe; controlling the air conditioner to perform refrigeration operation; controlling the first on-off valve, the second on-off valve to be closed and the throttling device to be closed to the minimum opening degree; controlling the compressor to adjust to a preset self-cleaning frequency; judging whether a valve opening condition is met or not according to the acquired exhaust temperature, exhaust pressure and/or intake pressure at intervals of a first interval; and when the first on-off valve is established, controlling the air conditioner to perform heating operation, and controlling the first on-off valve and the second on-off valve to be opened. This application can realize the automatically cleaning to indoor heat exchanger, solves indoor heat exchanger's intraductal filth stifled problem.
Description
Technical Field
The invention relates to the technical field of air conditioner self-cleaning, in particular to a method for controlling self-cleaning in a pipe of an indoor heat exchanger.
Background
After the air conditioner is used for a period of time, the refrigerating and heating effects are deteriorated. There are many factors affecting the cooling and heating effects, and the dirty blockage of the heat exchanger is one of the main reasons. For an indoor heat exchanger, the filth blockage of the indoor heat exchanger mainly comprises pipe outer filth blockage and pipe inner filth blockage, and the pipe outer filth blockage influences the air supply effect mainly due to the fact that the fin gaps of the heat exchanger are accumulated by indoor dust and impurities and the like, so that the heat exchange coefficient outside the pipe is reduced, and the heat exchange effect between the heat exchanger and air is poor. The heat exchange coefficient between the refrigerant and the coil pipe of the heat exchanger is reduced, so that the energy of the refrigerant in the pipe is influenced to be transmitted outwards. The main factor influencing the filth blockage in the pipe is refrigerating machine oil, the refrigerating machine oil in the compressor flows to a hairpin pipe of the heat exchanger along with a refrigerant, the current hairpin pipe is an internal thread copper pipe, the flowing of the refrigerating machine oil is influenced, and partial refrigerating machine oil cannot timely return to the inside of the compressor and stays on the inner wall of the thread copper pipe under the centrifugal force action of the flowing refrigerant, so that the heat transfer between the refrigerant and the coil pipe is blocked, the heat transfer temperature difference is reduced, and the refrigerating and heating effects of the air conditioner are deteriorated.
The surface dust and impurities can be removed by manually cleaning regularly or performing air conditioner frosting operation, but the pipe inside filth blockage is one of the main factors influencing the refrigerating and heating effects of the air conditioner and cannot be cleaned manually. Therefore, how to clean the indoor heat exchanger inside the tube is an urgent problem to be solved by air conditioner manufacturers.
Accordingly, there is a need in the art for a new method of controlling self-cleaning in a tube of an indoor 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 of how to realize the in-tube self-cleaning of the indoor heat exchanger, the present application provides a method for controlling the in-tube self-cleaning of the indoor heat exchanger, which is applied to an air conditioner, the air conditioner comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling device, an indoor heat exchanger, a recovery pipeline, a first on-off valve and a second on-off valve, the compressor, the four-way valve, the outdoor heat exchanger, the throttling device, the indoor heat exchanger, the recovery pipeline, the first on-off valve and the second on-off valve are sequentially connected through a refrigerant pipeline, the first on-off valve is arranged on the refrigerant pipeline between the throttling device and the indoor heat exchanger, one end of the recovery pipeline is arranged on the refrigerant pipeline between the throttling device and the first on-off valve, 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 method for controlling self-cleaning in the pipe comprises the following steps:
responding to a received instruction for carrying out in-pipe self-cleaning on the indoor heat exchanger, and entering an in-pipe self-cleaning mode;
controlling the air conditioner to perform refrigeration operation;
controlling the first on-off valve, the second on-off valve to be closed and the throttling device to be closed to the minimum opening degree;
controlling the compressor to adjust to a preset self-cleaning frequency;
acquiring the discharge temperature, the discharge pressure and/or the suction pressure of the compressor at intervals of a first interval;
judging whether a valve opening condition is met or not based on the acquired exhaust temperature, the acquired exhaust pressure and/or the acquired intake pressure;
when the valve opening condition is satisfied, the air conditioner heating operation is controlled, and the first on-off valve and the second on-off valve are controlled to be opened.
In a preferred technical solution of the method for controlling self-cleaning in a tube of an indoor heat exchanger, the air conditioner further includes a third shut-off valve disposed on a refrigerant line between the indoor heat exchanger and the four-way valve, and the method for controlling self-cleaning in a tube further includes:
after the air conditioner operates in a refrigerating mode and continues for a preset delay time, controlling the third stop valve to be closed; and
and controlling the third shut-off valve to open when the valve opening condition is satisfied.
In a preferred embodiment of the method for controlling self-cleaning in a tube of an indoor heat exchanger, the valve opening condition includes at least one of the following conditions:
the exhaust temperature is greater than or equal to an exhaust temperature threshold value and lasts for a first set time;
the exhaust pressure is greater than or equal to an exhaust pressure threshold value and lasts for a second set time;
and the suction pressure is less than or equal to a suction pressure threshold value and lasts for a third set time.
In a preferred technical solution of the method for controlling self-cleaning in a tube of an indoor heat exchanger, the method for controlling self-cleaning in a tube further includes:
and controlling the indoor fan to stop running at the same time of or after controlling the heating running of the air conditioner.
In a preferred technical solution of the method for controlling self-cleaning in a tube of an indoor heat exchanger, the method for controlling self-cleaning in a tube further includes:
and after controlling the air conditioner to perform heating operation for a fourth set time, exiting the in-pipe self-cleaning mode.
In a preferred embodiment of the method for controlling self-cleaning in a tube of an indoor heat exchanger, the step of exiting the self-cleaning mode in the tube further includes:
controlling the air conditioner to recover to the mode operation before entering the in-pipe self-cleaning mode;
controlling the compressor to maintain the self-cleaning frequency in operation;
controlling the throttle device to be opened to a preset opening degree;
and controlling the second cut-off valve to be closed.
In a preferred technical solution of the method for controlling self-cleaning in a tube of an indoor heat exchanger, the method for controlling self-cleaning in a tube further includes:
after controlling the throttle device to be opened to the preset opening degree and lasting for a fifth set time, controlling the throttle device to be restored to the opening degree before entering the in-pipe self-cleaning mode; and/or
And after the compressor keeps the self-cleaning frequency operation and lasts for a sixth set time, controlling the compressor to recover the frequency operation before entering the in-pipe self-cleaning mode.
In a preferred embodiment of the method for controlling self-cleaning in a tube of an indoor heat exchanger, the step of exiting the self-cleaning mode in the tube further includes:
controlling the indoor fan to be started and controlling an air deflector of the indoor unit to supply air upwards;
and after controlling the air deflector to supply air upwards and lasting for a seventh set time, controlling the indoor fan and the air deflector to recover to the running state before entering the in-pipe self-cleaning mode.
In an optimal technical scheme of the method for controlling self-cleaning in the pipe of the indoor heat exchanger, the preset opening degree is the maximum opening degree of the throttling device.
In the preferable technical scheme of the method for controlling self-cleaning in the tube of the indoor heat exchanger, the self-cleaning frequency is the maximum limit frequency corresponding to the outdoor environment temperature.
It should be noted that, in the preferred technical scheme of this application, the air conditioner includes the compressor that connects gradually through the refrigerant pipeline, the cross valve, outdoor heat exchanger, throttling arrangement, indoor heat exchanger, the air conditioner still includes the recovery pipeline, first on-off valve and second on-off valve, first on-off valve sets up on the refrigerant pipeline between throttling arrangement and indoor heat exchanger, the one end of recovery pipeline sets up on the refrigerant pipeline between throttling arrangement and first on-off valve, the other end of recovery pipeline communicates with the induction port of compressor, the second on-off valve sets up on the recovery pipeline, intraductal self-cleaning control method includes: responding to a received instruction for carrying out in-pipe self-cleaning on the outdoor heat exchanger, and entering an in-pipe self-cleaning mode; controlling the air conditioner to perform refrigeration operation; controlling the first on-off valve, the second on-off valve to be closed and the throttling device to be closed to the minimum opening degree; controlling the compressor to adjust to a preset self-cleaning frequency; acquiring the discharge temperature, the discharge pressure and/or the suction pressure of a compressor at intervals of a first interval; judging whether the valve opening condition is satisfied or not based on the acquired exhaust temperature, exhaust pressure and/or suction pressure; when the valve opening condition is established, the air conditioner is controlled to perform heating operation, and the first on-off valve and the second on-off valve are controlled to be opened.
Through the control mode, the control method can realize self-cleaning of the indoor heat exchanger, and solves the problem of pipe filth blockage of the indoor heat exchanger. Specifically, the air conditioner is controlled to perform refrigeration operation firstly, the first on-off valve and the second on-off valve are controlled to be closed, the throttling device is closed to the minimum opening degree, refrigerant discharged from the compressor is accumulated in the outdoor heat exchanger and the compressor, the refrigerant is recovered, the refrigerant is stored in the outdoor heat exchanger and the compressor, the air conditioner is controlled to perform heating operation when the condition of opening the valve is judged to be met based on the exhaust temperature, the exhaust pressure and/or the suction pressure of the compressor, the first on-off valve and the second on-off valve are opened, the interior of a coil pipe of the indoor heat exchanger can be effectively washed by utilizing the rapid flow of the high-temperature high-pressure refrigerant, oil stains on the inner wall of the coil pipe are washed away and directly return to the interior of the compressor along with the refrigerant through a recovery pipeline, and self-cleaning of the indoor heat exchanger is achieved. In addition, through setting up the recovery pipeline, can realize directly retrieving in bringing the compressor with the greasy dirt back at the automatically cleaning in-process, reduce the flow stroke of high temperature refrigerant, reduce the pressure drop of refrigerant, improve the automatically cleaning effect, practice thrift the automatically cleaning time, guarantee user experience.
Drawings
The in-tube self-cleaning control method of the indoor heat exchanger of the present application is described below 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 cooling mode;
FIG. 2 is a system diagram of the air conditioner of the present application in a heating mode;
FIG. 3 is a flow chart of a method for controlling self-cleaning in a tube of an indoor heat exchanger according to the present application;
fig. 4 is a logic diagram of a possible implementation process of the in-tube self-cleaning control method for the indoor 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; 10. a third shutoff 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 protection 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, split and exchange 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 into 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 as the case may be.
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 cooling 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 throttle device 4, an indoor heat exchanger 5, and an accumulator 11. The gas vent of compressor 1 passes through refrigerant pipeline 6 and the P interface intercommunication of cross valve 2, the C interface of cross valve 2 passes through refrigerant pipeline 6 and the import intercommunication of outdoor heat exchanger 3, the export of outdoor heat exchanger 3 passes through refrigerant pipeline 6 and a port intercommunication of throttling arrangement 4, another port of throttling arrangement 4 passes through refrigerant pipeline 6 and the import intercommunication of indoor heat exchanger 5, the export of indoor heat exchanger 5 passes through refrigerant pipeline 6 and the E interface intercommunication of cross valve 2, the S interface of cross valve 2 passes through refrigerant pipeline 6 and the import intercommunication of reservoir 11, the export of reservoir 11 passes through pipeline 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 a role 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 self-cleaning in a tube of an indoor heat exchanger according to 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 may adjust the method, for example, add other components on the basis of the structure of the air conditioner.
The method for controlling self-cleaning in the tube of the indoor heat exchanger according to the present invention will be described with reference to fig. 1 to 3. Fig. 2 is a system diagram of the air conditioner of the present application in a heating mode; fig. 3 is a flowchart of an in-tube self-cleaning control method of an indoor heat exchanger according to the present application.
As shown in fig. 2, in order to solve the problem of how to implement in-tube self-cleaning of an indoor heat exchanger, the in-tube self-cleaning control method of an indoor heat exchanger according to the present application includes:
s101, responding to a received command for carrying out in-pipe self-cleaning on the indoor heat exchanger, and entering an in-pipe self-cleaning mode.
In a possible implementation, the instruction of carrying out intraductal automatically cleaning to indoor heat exchanger can be sent by user's initiative, if send the instruction to the air conditioner through the button on the remote controller, perhaps send the instruction through the terminal with air conditioner communication connection, wherein the terminal can be the APP of installation on the smart machine, and the APP directly or through sending the instruction to the air conditioner to high in the clouds. The intelligent device comprises but is not limited to a mobile phone, a tablet personal computer, an intelligent sound box, an intelligent watch and the like, and the intelligent device is in communication connection with the air conditioner or the cloud end and comprises but is not limited to wifi, bluetooth, infrared, 3G/4G/5G and the like. After receiving an instruction of self-cleaning in the pipe of the indoor heat exchanger, the air conditioner switches the operation mode to the self-cleaning in the pipe, and starts to self-clean in the pipe of the coil pipe of the indoor heat exchanger. The self-cleaning mode in the pipe can be a computer program which is stored in the air conditioner in advance, and when the mode is operated, the air conditioner controls the operation of each part of the air conditioner according to the steps set by the program.
Of course, the self-cleaning command may also be automatically issued when the air conditioner reaches certain entry conditions, such as issuing a command for performing in-tube self-cleaning on the indoor heat exchanger when the accumulated working time of the air conditioner reaches a preset time, and the preset time may be, for example, 20h to 40h.
And S103, controlling the air conditioner to perform cooling operation.
In one possible embodiment, the switching between cooling and heating of the air conditioner is controlled by controlling the on/off of the four-way valve, for example, when the four-way valve is powered off, the air conditioner is in cooling operation, and when the four-way valve is powered on, the air conditioner is in heating operation. In the embodiment, after entering the in-tube self-cleaning mode, if the air conditioner is in the refrigeration mode, the air conditioner is controlled to continue to operate without adjustment; and if the air conditioner is running in the non-cooling mode, controlling the air conditioner to be switched to the cooling mode to run.
And S105, controlling the first on-off valve, the second on-off valve to be closed and the throttling device to be closed to the minimum opening degree.
In one possible embodiment, the first on-off valve is controlled to close, the refrigerant pipeline between the throttling device and the indoor heat exchanger is throttled, the second on-off valve is controlled to close, the recovery pipeline is throttled, and the electronic expansion valve is controlled to close to the minimum opening degree, namely, the opening degree is 0, at this time, the electronic expansion valve realizes complete throttling, and the refrigerant cannot flow through the electronic expansion valve. Referring to fig. 1, at this time, the refrigerant in the indoor heat exchanger is discharged from the compressor and is entirely accumulated in the outdoor heat exchanger and the compressor, thereby recovering the refrigerant in the indoor heat exchanger.
S107, controlling the compressor to adjust to a preset self-cleaning frequency.
In one possible embodiment, the self-cleaning frequency is a frequency determined by experiments in advance, the frequency can be close to or reach the highest operation frequency of the compressor, and when the compressor operates at a higher frequency, the pressure and the temperature of the refrigerant discharged from the air outlet of the compressor are higher, so that the temperature and the pressure of the refrigerant discharged from the compressor can be raised quickly. Preferably, the self-cleaning frequency is a maximum frequency corresponding to the outdoor ambient 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 compressor is provided with protective measures, the maximum limit frequency is correspondingly set under different outdoor environment temperatures, the self-cleaning frequency is the maximum limit frequency of the compressor under the current outdoor environment temperature, and under the frequency limit, the compressor can rapidly improve the pressure and the temperature of the refrigerant at the exhaust port in the shortest time. The manner of acquiring the outdoor ambient temperature is a conventional means in the art, and is not described herein again.
It should be noted that, although specific numerical values are not listed in the present application to describe the self-cleaning frequency, this does not mean that the control method of the present application cannot be implemented, and the self-cleaning frequency may be different in different types of air conditioners and under different environmental conditions, so that a person skilled in the art may set the self-cleaning frequency based on a specific application scenario, as long as the setting of the frequency enables the compressor to rapidly increase the pressure and the temperature of the refrigerant at the air outlet in a shorter time.
And S109, acquiring the discharge temperature, the discharge pressure and/or the suction pressure of the compressor at intervals of a first interval.
In a possible embodiment, the discharge temperature of the compressor may be obtained by providing a temperature sensor at the discharge port of the compressor, the discharge pressure may be obtained by providing a pressure sensor at the discharge port of the compressor, and the suction pressure may be obtained by providing a pressure sensor at the suction port of the compressor. The first interval time may be any value from 1s to 5s, which is selected in relation to the exhaust temperature, the exhaust pressure, the speed of change of the suction pressure and the control accuracy to be achieved in the present application. If the self-cleaning frequency is relatively large, the change speed of the exhaust temperature, the exhaust pressure and the suction pressure is high, or the application needs to achieve high control accuracy, the first interval time can be selected to be 1s or 2s or shorter, otherwise, if the self-cleaning frequency is relatively small, the change speed of the exhaust temperature, the exhaust pressure and the suction pressure is low, or the control method does not need to achieve high accuracy, the first interval time can be selected to be 4s or 5s or longer.
In the present application, the first interval time is preferably selected to be 1s, and the exhaust temperature, the exhaust pressure, and the suction pressure are all obtained. That is, after the compressor reaches the self-cleaning frequency, the discharge temperature, the discharge pressure, and the suction pressure of the compressor are simultaneously obtained every 1 s.
Of course, in other non-preferred embodiments, only one of the three parameters may be obtained. Further, the discharge temperature, the discharge pressure, and the suction pressure are not necessarily obtained in the only manner, and may be adjusted by those skilled in the art without departing from the principle of the present application, for example, the discharge temperature and the discharge pressure may be obtained by providing a temperature sensor and a pressure sensor on the coil of the outdoor heat exchanger, and the suction pressure may be obtained by providing a pressure sensor on the coil of the indoor heat exchanger.
And S111, judging whether the valve opening condition is met or not based on the acquired exhaust temperature, exhaust pressure and/or intake pressure.
In a possible embodiment, the valve-open condition comprises at least one of the following conditions: (1) The exhaust temperature is greater than or equal to an exhaust temperature threshold value and lasts for a first set time; (2) The exhaust pressure is greater than or equal to the exhaust pressure threshold value and lasts for a second set time; (3) The suction pressure is less than or equal to the suction pressure threshold value and lasts for a third set time. When the exhaust temperature is greater than or equal to the exhaust temperature threshold value and lasts for a first set time, the refrigerant after the exhaust port of the compressor reaches a relatively high temperature. Similarly, when the discharge pressure is greater than or equal to the discharge pressure threshold value and lasts for a second set time, the refrigerant after the discharge port of the compressor is proved to have reached a quite high pressure at the moment. When the suction pressure is less than or equal to the suction pressure threshold value and lasts for a third set time, the refrigerant at the suction port of the compressor is proved to be basically evacuated.
It is to be understood that the valve opening conditions described above are merely preferred embodiments in the present application, and those skilled in the art can adjust the valve opening conditions described above without departing from the principle of the present application, provided that the adjusted conditions can accurately determine the state of the refrigerant accumulated after the compressor. For example, the valve-open condition may include only one or two of the above three conditions; alternatively, the valve-opening condition may include only the judgment of the temperature/pressure, and the judgment of the duration may be omitted.
And S113, when the valve opening condition is met, controlling the air conditioner to perform heating operation and controlling the first on-off valve and the second on-off valve to be opened.
In one possible embodiment, when any of the above conditions (1) to (3) is met, the air conditioner heating operation is controlled, and the first and second on-off valves are controlled to be opened. At this time, as shown by arrows in fig. 2, the refrigerant recovered to the outdoor heat exchanger and the compressor is discharged in a high-temperature and high-pressure manner under the action of the compressor, and rapidly flows to the indoor heat exchanger, the oil stain attached to the inner wall of the coil pipe of the indoor heat exchanger is cleaned by utilizing the rapid flowing impact of the high-temperature and high-pressure refrigerant, and the washed oil stain is directly recovered to the liquid reservoir through the recovery pipeline to realize the oil stain filtration and the engine oil recovery, and then is discharged through the exhaust port again under the compression of the compressor, so that the circulation of the refrigerant is realized.
It can be seen that the refrigerant discharged from the compressor is accumulated in the outdoor heat exchanger and the compressor by controlling the air conditioner to perform refrigeration operation, controlling the first on-off valve and the second on-off valve to be closed and controlling the electronic expansion valve to be closed to the minimum opening degree, thereby realizing the recovery of the refrigerant. When the valve opening condition is judged to be established based on the exhaust temperature, the exhaust pressure and the suction pressure of the compressor, the first on-off valve and the second on-off valve are opened, the temperature and the pressure of the refrigerant are rapidly increased in a short time, the inside of the coil pipe of the indoor heat exchanger can be effectively washed by utilizing the rapid flow of the high-temperature and high-pressure refrigerant, oil stains on the inner wall of the coil pipe are washed away and directly returned to the inside of the liquid storage device along with the refrigerant through the recovery pipeline, and the indoor heat exchanger is automatically cleaned.
In addition, through setting up the recovery pipeline in the air conditioner, this application can be in the intraductal automatically cleaning in-process of executing to indoor heat exchanger, utilize the recovery pipeline to realize the recovery to refrigerator oil, realize that high temperature high pressure refrigerant is after scouring away indoor heat exchanger, need not to pass through outdoor heat exchanger once more, but directly take the greasy dirt back to and retrieve in the reservoir and filter, then again through compressor compression discharge circulation, the flow stroke of having reduced the high temperature refrigerant, reduce along journey pressure drop, improve intraductal automatically cleaning effect. Through the setting of reservoir, can filter the refrigerator oil of retrieving, avoid the impurity in the refrigerator oil to continue to participate in the refrigerant circulation.
Referring to fig. 1, in one possible embodiment, the air conditioner further includes a third cut-off valve 10, the third cut-off valve 10 is preferably a solenoid valve, the third cut-off valve 10 is a normally open valve and is disposed on the refrigerant pipeline 6 between the indoor heat exchanger 5 and the four-way valve 2, and the third cut-off valve 10 is in communication connection with a controller of the air conditioner to receive an opening and closing signal sent by the controller. Obviously, the third shut-off valve 10 may be replaced by an electronic control valve such as an electronic expansion valve.
On the basis of the third cut-off valve, the self-cleaning control method in the pipe further comprises the following steps: after the air conditioner operates in a refrigerating mode and continues to operate for a preset delay time, the third cut-off valve is controlled to be closed; and controlling the third cut-off valve to open when the valve opening condition is established.
Specifically, the preset delay time may be any value within 10s-1min, which is 30s in the present application, after the air conditioner continues to perform the cooling operation for 30s, substantially all the refrigerant in the indoor heat exchanger is recycled to the outdoor heat exchanger and the compressor, and at this time, the third shut-off valve is closed to prevent the refrigerant from flowing back, thereby ensuring that the compressor is rapidly heated and pressurized to reach a valve-opening condition. And after the valve opening condition is met, opening the third cut-off valve to enable the refrigerant recovered in the outdoor heat exchanger and the compressor to quickly impact a coil pipe of the indoor heat exchanger to automatically clean the indoor heat exchanger.
In one possible embodiment, the in-tube self-cleaning control method further comprises: and controlling the indoor fan to stop running at the same time of or after controlling the heating running of the air conditioner. Specifically, when the air conditioner is operated, the indoor heat exchanger is flushed by high temperature and high pressure of the refrigerant, and at the moment, if the indoor fan is started, the self-cleaning effect can be influenced, so that the indoor fan is controlled to stop operating, and the self-cleaning effect of the indoor heat exchanger is ensured. In addition, if before entering the intraductal self-cleaning mode, the air conditioner operation refrigeration mode, then close indoor fan this moment, can avoid the air-out high temperature, influence user experience.
In one possible embodiment, the in-tube self-cleaning control method further comprises: and after controlling the air conditioner to perform heating operation and lasting for a fourth set time, exiting the in-pipe self-cleaning mode. The fourth setting time can be any value from 3min to 10min, and is preferably 5min in the application. When the heating operation lasts for 5min, the high-temperature and high-pressure refrigerant circulates for many times to generate a better self-cleaning effect in the pipe, so that the self-cleaning mode in the pipe is exited when the on-off valve is opened for 5min.
Specifically, the step of exiting the in-tube self-cleaning mode further comprises: controlling the air conditioner to recover the mode operation before entering the self-cleaning mode in the pipe, controlling the compressor to keep the self-cleaning frequency operation, controlling the throttling device to be opened to the preset opening degree, and controlling the second cut-off valve to be closed. After the self-cleaning process in the air conditioner is completed, the air conditioner needs to be restored to the operation mode before the self-cleaning in the air conditioner so as to continuously adjust the indoor temperature. Still taking the refrigeration operation of the air conditioner before entering the in-tube cleaning mode as an example, after the in-tube self-cleaning mode is executed, the refrigeration mode operation needs to be switched back. At the moment, the four-way valve is controlled to be powered off to recover the refrigeration mode, the compressor is controlled to keep running at the self-cleaning frequency, the electronic expansion valve is controlled to be opened to the preset 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 refrigeration mode. The preset opening degree is the maximum opening degree of the throttling device, and due to the fact that most refrigerants circulate between the compressor and the indoor heat exchanger when the self-cleaning mode in the pipe is operated, refrigerant media in the outdoor heat exchanger are lost, the throttling device is adjusted to the maximum opening degree, the outdoor heat exchanger is rapidly filled with the refrigerants, and normal circulation of the refrigerants is achieved as soon as possible. The compressor still runs at the self-cleaning frequency, namely the maximum limit frequency, so that the circulation speed of the refrigerant can be increased, and the temperature of the coil pipe of the indoor heat exchanger can be quickly reduced.
Accordingly, after the throttle device is controlled to be opened to the preset opening degree for the fifth set time, the throttle device is controlled to be restored to the opening degree before the self-cleaning mode in the pipe is entered. The fifth setting time can be any value within 1-5 min, the application is preferably 3min, when the electronic expansion valve runs for 3min at the maximum opening, the refrigerant circulation tends to be stable, and at the moment, the electronic expansion valve is controlled to recover to the opening before entering the in-pipe self-cleaning mode, so that the electronic expansion valve completely recovers the refrigeration parameters before entering the in-pipe self-cleaning mode to continue running.
Accordingly, after controlling the compressor to maintain the self-cleaning frequency operation for the sixth set time, the compressor is controlled to resume the frequency operation before entering the in-pipe self-cleaning mode. The sixth set time can be any value within 1-5 min, preferably 3min, when the compressor runs for 3min at the maximum frequency, the temperature of the coil of the indoor heat exchanger is rapidly reduced, and the compressor is controlled to recover to the frequency before entering the self-cleaning mode in the pipe, so that the air conditioner completely recovers the refrigeration parameters before entering the self-cleaning mode in the pipe to continue running.
Of course, the manner of exiting the in-duct 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 in-duct self-cleaning mode. For example, all the components may be directly controlled to return to the operating state before entering the in-tube self-cleaning mode, or one or more components may be first controlled to return to the operating state before entering the in-tube self-cleaning mode, and then all the components may be gradually returned to the operating state before entering the in-tube self-cleaning mode.
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 self-cleaning in a tube of an indoor heat exchanger according to the present application.
As shown in fig. 4, in a possible implementation process, when the air conditioner is in cooling operation, a user sends an instruction for performing in-tube self-cleaning on the indoor heat exchanger to the air conditioner through a remote controller key:
firstly, step S201 is executed, the air conditioner enters an in-pipe self-cleaning mode, namely, the air conditioner is controlled to run in a refrigerating mode, the first on-off valve and the second on-off valve are closed, the electronic expansion valve is closed to the minimum opening degree, and the third on-off valve is controlled to be closed after the compressor runs for 30S, so that the indoor refrigerant is recovered.
Step S203 is executed to control the compressor to increase the frequency to the maximum frequency corresponding to the outdoor ambient temperature.
Step S205 is executed next, and the discharge temperature Td, the discharge pressure Pd, and the suction pressure Ps of the compressor are acquired.
Next, step S207 is executed to determine whether at least one of Td ≧ T, pd ≧ P1 and Ps ≤ P2 is satisfied, where T is an exhaust temperature threshold, P1 is an exhaust pressure threshold, and P2 is an intake pressure threshold. And executing step S209 when at least one of the determination results is satisfied, otherwise, returning to execute step S205 when none of the three determination conditions is satisfied.
S209, controlling the air conditioner to perform heating operation, stopping the indoor fan, and opening the first on-off valve, the second on-off valve and the third on-off valve.
Step S211 is executed next, and whether the duration time t1 of the heating operation is more than or equal to 5min is judged; if the determination result is true, step S213 is executed, otherwise, if the determination result is false, step S211 is returned to be continuously executed.
And S213, exiting the in-pipe self-cleaning mode, specifically, controlling the air conditioner to operate in a refrigeration mode, opening the electronic expansion valve to the maximum opening degree, keeping the self-cleaning frequency of the compressor, starting the indoor fan, enabling the air deflector to supply air upwards, and controlling the second on-off valve to be closed.
Step S215 is executed next, and whether the time t2 for opening the indoor fan is more than or equal to 30S is judged; when the judgment result is satisfied, executing step S217, otherwise, returning to continue executing step S215;
and S217, controlling the indoor fan and the air deflector to recover the running state before the indoor fan and the air deflector enter the self-cleaning mode.
Next, step S219 is executed, and whether the duration time t3 of the refrigeration mode is more than or equal to 3min is judged; if the determination result is true, executing step S221; otherwise, if the determination result is false, the process returns to continue to step S219.
S221, controlling the electronic expansion valve to recover to the opening degree before entering the in-pipe self-cleaning mode, and considering the frequency operation before the built-in compressor recovers to enter the in-pipe self-cleaning mode. And the air conditioner recovers to the refrigeration mode before entering the self-cleaning mode in the pipe.
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 the above sequential order, those skilled in the art can understand that, in order to achieve the effect of the present embodiments, the different steps need not be executed in such an order, and may be executed simultaneously (in parallel) or in an inverted order, and these simple changes are all within the scope of protection of the present application. For example, although the above-mentioned step S207 is described with reference to the simultaneous determination of Td ≧ T, pd ≧ P1 and Ps ≦ P2, those skilled in the art will appreciate that the above-mentioned three conditions may be determined sequentially.
It should be noted that, although the above embodiments are described with reference to the air conditioner running cooling mode before entering the in-duct self-cleaning mode, this is not intended to limit the scope of the present application, and when the air conditioner runs in other modes, if an instruction to enter the in-duct self-cleaning mode is received, the four-way valve is controlled to perform corresponding power on/off switching. For example, on the premise of the heating mode of air conditioner operation, when an instruction of entering the in-pipe self-cleaning mode is received, the four-way valve is controlled to be switched to the cooling mode in a power-off mode.
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 in-pipe self-cleaning control method of an indoor heat exchanger is applied to an air conditioner and is characterized in that the air conditioner comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling device and an indoor heat exchanger which are sequentially connected through a refrigerant pipeline, 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 throttling device and the indoor heat exchanger, one end of the recovery pipeline is arranged on the refrigerant pipeline between the throttling device and the first on-off valve, 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 method for controlling self-cleaning in the pipe comprises the following steps:
responding to a received instruction for carrying out in-pipe self-cleaning on the indoor heat exchanger, and entering an in-pipe self-cleaning mode;
controlling the air conditioner to perform refrigeration operation;
controlling the first on-off valve, the second on-off valve to be closed and the throttling device to be closed to the minimum opening degree;
controlling the compressor to adjust to a preset self-cleaning frequency;
acquiring the discharge temperature, the discharge pressure and/or the suction pressure of the compressor at intervals of a first interval;
judging whether a valve opening condition is met or not based on the acquired exhaust temperature, the acquired exhaust pressure and/or the acquired intake pressure;
when the valve opening condition is satisfied, the air conditioner heating operation is controlled, and the first on-off valve and the second on-off valve are controlled to be opened.
2. The method of controlling self-cleaning in a tube of an indoor heat exchanger as claimed in claim 1, wherein the air conditioner further comprises a third shut-off valve disposed on a refrigerant line between the indoor heat exchanger and the four-way valve, the method further comprising:
after the air conditioner operates in a refrigerating mode and continues for a preset delay time, controlling the third stop valve to be closed; and
and controlling the third shut-off valve to open when the valve opening condition is satisfied.
3. The in-tube self-cleaning control method of an indoor heat exchanger as claimed in claim 1, wherein the valve-open condition includes at least one of the following conditions:
the exhaust temperature is greater than or equal to an exhaust temperature threshold value and lasts for a first set time;
the exhaust pressure is greater than or equal to an exhaust pressure threshold value and lasts for a second set time;
and the suction pressure is less than or equal to a suction pressure threshold value and lasts for a third set time.
4. The in-tube self-cleaning control method of an indoor heat exchanger according to claim 1, further comprising:
and controlling the indoor fan to stop running at the same time of or after controlling the heating running of the air conditioner.
5. The in-tube self-cleaning control method of an indoor heat exchanger according to claim 4, further comprising:
and after controlling the air conditioner to perform heating operation and lasting for a fourth set time, exiting the self-cleaning mode in the pipe.
6. The in-tube self-cleaning control method of an indoor heat exchanger according to claim 5, wherein the step of exiting the in-tube self-cleaning mode further comprises:
controlling the air conditioner to recover to the mode operation before entering the in-pipe self-cleaning mode;
controlling the compressor to maintain the self-cleaning frequency in operation;
controlling the throttling device to be opened to a preset opening degree;
and controlling the second stop valve to close.
7. The in-tube self-cleaning control method of an indoor heat exchanger according to claim 6, further comprising:
after controlling the throttle device to be opened to the preset opening degree and lasting for a fifth set time, controlling the throttle device to be restored to the opening degree before entering the in-pipe self-cleaning mode; and/or
And after the compressor keeps the self-cleaning frequency operation and lasts for a sixth set time, controlling the compressor to recover the frequency operation before entering the in-pipe self-cleaning mode.
8. The method of controlling self-cleaning in a tube of an indoor heat exchanger as claimed in claim 6, wherein the step of exiting the self-cleaning in a tube mode further comprises:
controlling the indoor fan to be started and controlling an air deflector of the indoor unit to supply air upwards;
and after controlling the air deflector to supply air upwards and lasting for a seventh set time, controlling the indoor fan and the air deflector to recover to the running state before entering the in-pipe self-cleaning mode.
9. The method of controlling self-cleaning in a pipe of an indoor heat exchanger as claimed in claim 6, wherein the preset opening degree is a maximum opening degree of the throttling means.
10. The method for controlling self-cleaning in a tube of an indoor heat exchanger as claimed in claim 1, wherein the self-cleaning frequency is a maximum frequency corresponding to an outdoor ambient temperature.
Priority Applications (2)
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| CN202110801951.9A CN113654196B (en) | 2021-07-15 | 2021-07-15 | Method for controlling self-cleaning in indoor heat exchanger |
| PCT/CN2021/129813 WO2023284200A1 (en) | 2021-07-15 | 2021-11-10 | In-pipe self-cleaning control method for indoor heat exchanger |
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| CN202110801951.9A CN113654196B (en) | 2021-07-15 | 2021-07-15 | Method for controlling self-cleaning in indoor heat exchanger |
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| CN114504857B (en) * | 2022-01-24 | 2024-07-16 | 青岛海尔空调器有限总公司 | Filter, air conditioner and impurity filtering backflow preventing method of air conditioner |
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| CN110285544A (en) * | 2019-07-05 | 2019-09-27 | 珠海格力电器股份有限公司 | Oil return control method, device and system of temperature adjusting equipment and air conditioner |
| CN111811106A (en) * | 2020-06-24 | 2020-10-23 | 珠海格力电器股份有限公司 | Cleaning control method and device, air conditioner, storage medium and processor |
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| CN113654196A (en) | 2021-11-16 |
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