CN113654191B - In-pipe self-cleaning control method of outdoor heat exchanger - Google Patents
In-pipe self-cleaning control method of outdoor heat exchanger Download PDFInfo
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- CN113654191B CN113654191B CN202110802941.7A CN202110802941A CN113654191B CN 113654191 B CN113654191 B CN 113654191B CN 202110802941 A CN202110802941 A CN 202110802941A CN 113654191 B CN113654191 B CN 113654191B
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- 238000004140 cleaning Methods 0.000 title claims abstract description 151
- 238000000034 method Methods 0.000 title claims abstract description 62
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000011084 recovery Methods 0.000 claims abstract description 28
- 238000005057 refrigeration Methods 0.000 claims abstract description 11
- 239000003507 refrigerant Substances 0.000 claims description 75
- 230000003434 inspiratory effect Effects 0.000 claims description 4
- 230000002045 lasting effect Effects 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 12
- 239000007788 liquid Substances 0.000 description 8
- 239000003921 oil Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000010721 machine oil 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
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification 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
- 238000007796 conventional method 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
- 230000006698 induction Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 210000001835 viscera Anatomy 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
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
-
- 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 self-cleaning of air conditioners, in particular to an in-pipe self-cleaning control method of an outdoor heat exchanger. The application aims at solving the problem of how to realize the self-cleaning in the pipe of the outdoor heat exchanger. For this purpose, the air conditioner of this application is provided with first on-off valve, second on-off valve and recovery pipeline, and control method includes: responding to a received instruction for performing in-pipe self-cleaning, and entering an in-pipe self-cleaning mode; controlling the heating operation of the air conditioner; the first on-off valve is controlled to be closed, the second on-off valve is controlled to be opened, and the throttling device is controlled to be closed to the minimum opening; controlling the compressor to adjust to a preset self-cleaning frequency; judging whether the valve opening condition is met according to the exhaust temperature, the exhaust pressure and/or the suction pressure at intervals of a first interval; when the air conditioner is established, the air conditioner is controlled to perform refrigeration operation, the first on-off valve is controlled to be kept closed, the second on-off valve is controlled to be kept open, and the throttling device is controlled to be opened to a preset opening degree. The application can realize the self-cleaning of the indoor heat exchanger.
Description
Technical Field
The invention relates to the technical field of self-cleaning of air conditioners, in particular to an in-pipe self-cleaning control method of an outdoor heat exchanger.
Background
There are many factors affecting the cooling and heating effects of the air conditioner, wherein the dirty blockage of the heat exchanger is one of the main reasons. For the outdoor heat exchanger, the dirty plugs mainly comprise an external dirty plug and an internal dirty plug, and the external dirty plug affects the air supply effect mainly due to the fin gaps of the accumulated heat exchanger such as outdoor dust impurities, so that the heat exchange coefficient outside the tube is reduced, and the heat exchange effect between the heat exchanger and air is poor. The pipe internal blocking is mainly due to the fact that the heat exchange coefficient between the refrigerant and the heat exchanger coil is reduced, and energy of the refrigerant in the pipe is affected to be transmitted outwards. The main factors affecting the filth blockage in the pipe are refrigerating machine oil, and the refrigerating machine oil in the compressor flows to the hairpin pipe of the heat exchanger along with the refrigerant.
The external dirt blocking of the outdoor heat exchanger can also remove dust and impurities on the surface by means of manual periodic cleaning, or air conditioner frosting and defrosting operation, but the internal dirt blocking of the pipe is not only one of the main factors influencing the refrigerating and heating effects of the air conditioner, but also can not be cleaned manually. Therefore, how to clean the indoor heat exchanger in the pipe is a urgent problem to be solved by air conditioner manufacturers.
Accordingly, there is a need in the art for a new in-line 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 above problems in the prior art, that is, in order to solve the problem of how to realize the in-pipe self-cleaning of the outdoor heat exchanger, the application provides an in-pipe self-cleaning control method of the outdoor heat exchanger, which is applied to an air conditioner, the air conditioner comprises a compressor, a four-way valve, an indoor heat exchanger, a throttling device and the outdoor heat exchanger which are sequentially connected through a refrigerant pipeline, the air conditioner further comprises a recovery pipeline, a first on-off valve and a second on-off valve, the first on-off valve is arranged on the refrigerant pipeline between the indoor heat exchanger and the throttling device, one end of the recovery pipeline is arranged on the refrigerant pipeline between the first on-off valve and the throttling device, the other end of the recovery pipeline is communicated with an air suction port of the compressor, the second on-off valve is arranged on the recovery pipeline,
the in-pipe self-cleaning control method comprises the following steps:
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 heating operation of the air conditioner;
controlling the first on-off valve to be closed, the second on-off valve to be opened, and the throttling device to be closed to the minimum opening;
controlling the compressor to adjust to a preset self-cleaning frequency;
obtaining the discharge temperature, discharge pressure and/or suction pressure of the compressor at intervals of a first interval;
determining whether a valve-off condition is established based on the obtained exhaust temperature, exhaust pressure, and/or intake pressure;
when the valve opening condition is met, controlling the air conditioner to perform refrigeration operation, and controlling the first on-off valve to be kept closed, the second on-off valve to be kept open and the throttling device to be opened to a preset opening degree.
In the preferred technical scheme of the in-pipe self-cleaning control method of the outdoor heat exchanger, the air conditioner further comprises a third on-off valve, the third on-off valve is arranged on a refrigerant pipeline between the four-way valve and the indoor heat exchanger, and the in-pipe self-cleaning control method further comprises:
after the air conditioner heats and runs and lasts for a first preset delay time, the third on-off valve is controlled to be closed; and
and when the valve opening condition is met, controlling the third on-off valve to be opened.
In the preferable technical scheme of the in-pipe self-cleaning control method of the outdoor heat exchanger, the valve opening condition comprises at least one of the following conditions:
the exhaust temperature is greater than or equal to an exhaust temperature threshold 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;
the inspiratory pressure is less than or equal to an inspiratory pressure threshold and lasts for a third set time.
In the preferable technical scheme of the in-pipe self-cleaning control method of the outdoor heat exchanger, the in-pipe self-cleaning control method further comprises the following steps:
and after the air conditioner heats and runs for a second preset delay time, controlling the indoor fan to stop running.
In the preferable technical scheme of the in-pipe self-cleaning control method of the outdoor heat exchanger, the in-pipe self-cleaning control method further comprises the following steps:
and after controlling the air conditioner to perform refrigeration operation and lasting for a fourth set time, exiting the in-pipe self-cleaning mode.
In the preferable technical scheme of the in-pipe self-cleaning control method of the outdoor heat exchanger, the step of exiting the in-pipe self-cleaning mode further includes:
controlling the air conditioner to restore to the mode operation before entering the pipe for self-cleaning;
controlling the compressor to keep the self-cleaning frequency running;
controlling the throttling device to keep the preset opening;
and controlling the second on-off valve to be closed.
In the preferable technical scheme of the in-pipe self-cleaning control method of the outdoor heat exchanger, the in-pipe self-cleaning control method further comprises the following steps:
after the throttle device is controlled to keep the preset opening and the fifth set time is continued, controlling the throttle device to recover to the opening before entering the in-pipe self-cleaning mode; and/or
After the compressor keeps the self-cleaning frequency running for a sixth set time, controlling the compressor to restore to the frequency running before entering the pipe for self-cleaning.
In the preferable technical scheme of the in-pipe self-cleaning control method of the outdoor heat exchanger, the step of exiting the in-pipe self-cleaning mode further comprises:
when the temperature of the coil pipe of the indoor heat exchanger reaches the cold air prevention temperature, the indoor fan is controlled to start to operate.
In the preferable technical scheme of the in-pipe self-cleaning control method of the outdoor heat exchanger, the preset opening degree is the maximum opening degree of the throttling device.
In the preferable technical scheme of the in-pipe self-cleaning control method of the outdoor heat exchanger, the self-cleaning frequency is the highest limit frequency corresponding to the outdoor environment temperature.
It should be noted that, in the preferred technical scheme of the application, the air conditioner includes the compressor that connects gradually through the refrigerant pipeline, the cross valve, indoor heat exchanger, throttling arrangement, outdoor 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 indoor heat exchanger and the throttling arrangement, the one end of recovery pipeline sets up on the refrigerant pipeline between first on-off valve and the throttling arrangement, 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 automatically cleaning control method includes: responding to a received instruction for performing in-pipe self-cleaning on the outdoor heat exchanger, and entering an in-pipe self-cleaning mode; controlling the heating operation of the air conditioner; controlling the first on-off valve to be closed, the second on-off valve to be opened, and the throttling device to be closed to the minimum opening; controlling the compressor to adjust to a preset self-cleaning frequency; obtaining the discharge temperature, discharge pressure and/or suction pressure of the 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 met, the air conditioner is controlled to perform refrigeration operation, the first on-off valve is controlled to be kept closed, the second on-off valve is controlled to be kept open, and the throttling device is controlled to be opened to a preset opening degree.
Through the control mode, the self-cleaning of the outdoor heat exchanger can be realized, and the problem of pipe viscera blockage of the outdoor heat exchanger is solved. Specifically, the heating operation of the air conditioner is controlled firstly, the first on-off valve is controlled to be closed, the second on-off valve is controlled to be opened, the throttling device is closed to the minimum opening, the refrigerant discharged from the compressor is accumulated in the indoor heat exchanger and the compressor, the refrigerant is recovered, the refrigerant is stored in the indoor heat exchanger and the compressor, the refrigerating operation of the air conditioner is controlled when the condition that the on-off valve condition is judged to be met based on the exhaust temperature, the exhaust pressure and/or the suction pressure of the compressor is judged, the first on-off valve is controlled to be closed, the second on-off valve is controlled to be opened, the throttling device is controlled to be opened to the preset opening, the coil inside of the outdoor heat exchanger can be effectively flushed by the rapid flow of the high-temperature and high-pressure refrigerant, the greasy dirt on the inner wall of the coil is flushed and directly returns to the inside of the compressor along with the refrigerant through the recovery pipeline, and the self-cleaning of the outdoor heat exchanger is realized. In addition, through setting up the recovery pipeline, can realize directly retrieving in the compressor with the greasy dirt in self-cleaning process, reduce the flow stroke of high temperature refrigerant, reduce the pressure drop of refrigerant, improve self-cleaning effect, practice thrift self-cleaning time, guarantee user experience.
Drawings
An in-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 in-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 in-tube self-cleaning control method 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. a first on-off valve; 9. a second on-off valve; 10. a third cut-off valve; 11. a reservoir.
Detailed Description
Preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are 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, "and sixth" 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 indoor heat exchanger 5, a throttle device 4, an outdoor heat exchanger 3, and a reservoir 11. 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 indoor heat exchanger 5 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 11 through the refrigerant pipeline 6, and the outlet of the liquid accumulator 11 is communicated with the air suction port of the compressor 1 through a pipeline. The throttle device 4 is preferably an electronic expansion valve, a filter screen is arranged in the liquid reservoir 11, and the liquid reservoir 11 can play roles in storing refrigerant, separating refrigerant from gas and liquid, filtering greasy dirt, silencing, buffering 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, wherein 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 indoor heat exchanger 5 and the throttling device 4, the second on-off valve 9 is a normally closed valve and is arranged on the recovery pipeline 7, the recovery pipeline 7 adopts a copper pipe with a smooth inner wall, a first end of the copper pipe is arranged on the refrigerant pipeline 6 between the first on-off valve 8 and the throttling device 4, and a 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 storage device 11. The first on-off valve 8 and the second on-off valve 9 are both in communication connection with a controller of the air conditioner so as to receive opening and closing signals issued by the controller. Of course, one or more of the on-off valves can be replaced by an electronic expansion valve or other electronic control valve.
The following method for controlling the self-cleaning in the pipe of the outdoor heat exchanger 3 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, add other components on the basis of the structure of the air conditioner.
The in-pipe self-cleaning control method of the outdoor heat exchanger of the present application will be described with reference to fig. 1 to 3. Fig. 2 is a system diagram of the air conditioner in the cooling mode; fig. 3 is a flow chart of a method of in-tube self-cleaning control of an outdoor heat exchanger of the present application.
As shown in fig. 2, in order to solve the problem of how to implement the in-pipe self-cleaning of the outdoor heat exchanger, the in-pipe self-cleaning control method of the outdoor heat exchanger of the present application includes:
s101, 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.
In a possible implementation manner, the instruction of performing in-pipe self-cleaning on the outdoor heat exchanger can be actively sent by a user, for example, the instruction is sent to the air conditioner through a key on the remote controller, or the instruction is sent through a terminal in communication connection with the air conditioner, wherein the terminal can be an APP installed on the intelligent device, and the APP directly or through sending the instruction to the air conditioner to the cloud. The intelligent equipment comprises a mobile phone, a tablet personal computer, an intelligent sound box, an intelligent watch and the like, and the intelligent equipment is in communication connection with an air conditioner or a cloud terminal in a manner of wifi, bluetooth, infrared, 3G/4G/5G and the like. After receiving the instruction of cleaning the indoor heat exchanger, the air conditioner switches the operation mode to the self-cleaning mode, and starts to clean the coil pipe of the outdoor heat exchanger. The in-pipe self-cleaning mode 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 all parts of the air conditioner according to the steps set by the program.
Of course, the self-cleaning instruction may be automatically sent when the air conditioner reaches certain entering conditions, for example, when the accumulated working time of the air conditioner reaches a preset time, the self-cleaning instruction for the indoor heat exchanger is sent, and the preset time may be, for example, 20h-40h.
S103, controlling the heating operation of the air conditioner.
In a possible implementation manner, the switching between heating and cooling 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 this embodiment, after entering the in-pipe 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 operation.
S105, controlling the first on-off valve to be closed, the second on-off valve to be opened, and the throttling device to be closed to the minimum opening.
In a possible implementation manner, the first on-off valve is controlled to be closed, a refrigerant pipeline between the indoor heat exchanger and the throttling device is throttled, the second on-off valve is controlled to be opened, the refrigerant is recovered by the recovery pipeline, the electronic expansion valve is controlled to be closed to a minimum opening, namely, the opening is in a state of 0, at the moment, the electronic expansion valve realizes complete throttling, and the refrigerant cannot flow through. Referring to fig. 1, at this time, the refrigerant in the outdoor heat exchanger is discharged from the compressor and is entirely accumulated in the indoor heat exchanger and the compressor, thereby realizing recovery of the refrigerant in the outdoor heat exchanger.
And S107, controlling the compressor to adjust to a preset self-cleaning frequency.
In one possible implementation manner, the self-cleaning frequency is a frequency determined through 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 exhaust port are higher, so that the refrigerant discharged from the compressor can be quickly heated and boosted. Preferably, the self-cleaning frequency is 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 compressor is provided with protection measures, and the highest limit frequency is correspondingly arranged at different outdoor environment temperatures, and the self-cleaning frequency is the highest limit frequency of the compressor at the current outdoor environment temperature, and the compressor can rapidly improve the pressure and the temperature of the exhaust port refrigerant in the shortest time under the frequency limit. The method for obtaining the outdoor environment temperature is a conventional method in the art, and is not described herein.
It should be noted that, although specific values are not listed in the application to describe the self-cleaning frequency, this does not represent that the control method of the application cannot be implemented, and the self-cleaning frequency may be different in different types of air conditioners and different environmental conditions, so those skilled in the art can set the self-cleaning frequency based on specific application scenarios, as long as the setting of the frequency can enable the rapid increase of the pressure and the temperature of the refrigerant at the exhaust port to be achieved in a shorter time.
S109, obtaining the discharge temperature, discharge pressure and/or suction pressure of the compressor at intervals of a first interval.
In one 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 may be any value from 1s to 5s, which is selected in relation to the exhaust temperature, the exhaust pressure, the rate 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 speeds of the exhaust temperature, the exhaust pressure and the suction pressure are relatively high, or the application needs to achieve higher control precision, the first interval time can be selected to be 1s, 2s or shorter, otherwise if the self-cleaning frequency is relatively small, the change speeds of the exhaust temperature, the exhaust pressure and the suction pressure are relatively low, or the application control method does not need to achieve higher precision, the first interval time can be selected to be 4s, 5s or longer.
In this application, the first interval is preferably selected to be 1s, and the exhaust temperature, the exhaust pressure, and the suction pressure are all required to be obtained. That is, after the compressor reaches the self-cleaning frequency, the discharge temperature, discharge pressure, and suction pressure of the compressor are simultaneously acquired every 1 s.
Of course, in other non-preferred embodiments, only one of the three parameters may be obtained. In addition, the exhaust temperature, the exhaust pressure, and the suction pressure are not limited to the above-mentioned methods, and those skilled in the art may adjust the methods without departing from the principles of the present application, for example, the exhaust temperature and the exhaust pressure may be obtained by providing a temperature sensor, a pressure sensor, etc. on a coil of the indoor heat exchanger, and the suction pressure may be obtained by providing a pressure sensor on a coil of the outdoor heat exchanger.
S111, judging whether the valve opening condition is met or not based on the acquired exhaust temperature, exhaust pressure and/or suction pressure.
In one possible embodiment, the valve opening condition includes 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 inhalation pressure is less than or equal to the inhalation pressure threshold and lasts for a third set time. When the discharge temperature is greater than or equal to the discharge temperature threshold value and lasts for the first set time, the refrigerant after the discharge port of the compressor is proved to reach a quite high temperature. Similarly, when the discharge pressure is equal to or greater than the discharge pressure threshold for a second set time, it is proved that the refrigerant after the compressor discharge has reached a relatively high pressure. 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.
Of course, in the present application, the above-mentioned valve opening condition is only a preferred embodiment, and a person skilled in the art can adjust the above-mentioned valve opening condition without departing from the principle of the present application, so long as the adjusted condition can accurately determine the state of the refrigerant accumulated after the compressor. For example, the valve opening condition may also include only one or two of the above three conditions; or the valve-opening condition may include only the judgment of the temperature/pressure, and the judgment of the duration time or the like may be omitted.
And S113, when the valve opening condition is met, controlling the air conditioner to perform refrigeration operation, controlling the first on-off valve and the second on-off valve to keep the current state, and controlling the throttling device to be opened to a preset opening degree.
In one possible embodiment, when any of the above conditions (1) - (3) is satisfied, the air conditioner is controlled to perform a cooling operation, and the first on-off valve is controlled to be kept closed, the second on-off valve is controlled to be kept open, and the throttle device is controlled to be opened to a preset opening degree. At this time, as shown by arrows in fig. 2, the refrigerant recovered to the indoor heat exchanger and the compressor is discharged in a high-temperature and high-pressure mode under the action of the compressor, and flows to the outdoor heat exchanger rapidly, oil stains attached to the inner wall of a coil pipe of the outdoor heat exchanger are washed by rapid flowing impact of the high-temperature and high-pressure refrigerant, the washed oil stains are directly recovered to the liquid reservoir through the recovery pipeline to realize oil stain filtration and oil recovery, and then discharged through the exhaust port again under the compression of the compressor to realize the circulation of the refrigerant. Preferably, the preset opening is the maximum opening of the throttling device, and the throttling device is controlled to be opened to the maximum opening, so that the high-temperature and high-pressure refrigerant can rapidly pass through, the pressure drop in the flowing process of the refrigerant is reduced, and the self-cleaning effect in the pipe is improved.
It can be seen that by controlling the heating operation of the air conditioner, the first on-off valve is controlled to be closed, the second on-off valve is controlled to be opened, and the throttling device is controlled to be closed to the minimum opening, so that the refrigerant discharged from the compressor is accumulated in the indoor heat exchanger and the compressor, and the recovery of the refrigerant is realized. When the conditions of the disconnecting valve are judged based on the exhaust temperature, the exhaust pressure and the suction pressure of the compressor, the first on-off valve is controlled to be closed, the second on-off valve is controlled to be opened, the throttling device is opened to a preset opening degree, the temperature and the pressure of the refrigerant are rapidly increased in a short time, the inside of the coil of the outdoor heat exchanger can be effectively flushed by utilizing the rapid flow of the high-temperature and high-pressure refrigerant, oil stains on the inner wall of the coil are flushed and directly returned to the inside of the liquid storage device along with the refrigerant by the recovery pipeline, and the 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 intraductal automatically cleaning in-process to outdoor heat exchanger, utilize recovery pipeline to realize retrieving refrigerating machine oil, realize high temperature high pressure refrigerant and wash the back to outdoor heat exchanger, need not to pass through outdoor heat exchanger once more, but directly carry the greasy dirt back to the reservoir and retrieve the filtration, then discharge the circulation through the compressor compression again, reduced the flow stroke of high temperature refrigerant, reduced along the journey pressure drop, improve intraductal automatically cleaning effect. Through the setting of reservoir, can filter the refrigerator oil of retrieving, avoid 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 on-off valve 10, the third on-off valve 10 is preferably a solenoid valve, the third on-off valve 10 is a normally open valve, which is disposed on the refrigerant line 6 between the four-way valve 2 and the indoor heat exchanger 5, and the third on-off valve 10 is communicatively connected with a controller of the air conditioner to receive an on-off signal issued by the controller. Obviously, the third on-off valve 10 can be replaced by an electronic control valve such as an electronic expansion valve.
On the basis of being provided with a third on-off valve, the in-pipe self-cleaning control method further comprises the following steps: after the air conditioner heats and runs and lasts for a first preset delay time, the third three-way cut-off valve is controlled to be closed; and when the valve opening condition is met, controlling the third three-way shut-off valve to be opened.
Specifically, the first preset delay time can be any value of 10s-1min, in this application, 30s, after the heating operation of the air conditioner lasts for 30s, the refrigerant in the outdoor heat exchanger is basically all recovered to the indoor heat exchanger and the compressor, and at the moment, the third three-way valve is closed to prevent the refrigerant from flowing back, so that the condition that the temperature and the pressure of the compressor are raised quickly and reach the valve opening condition is ensured. After the valve opening condition is met, the third on-off valve is opened, so that the refrigerant recovered in the indoor heat exchanger and the compressor can rapidly impact the coil pipe of the outdoor heat exchanger, and the outdoor heat exchanger is self-cleaned.
In one possible embodiment, the in-tube self-cleaning control method further comprises: and after the heating operation of the air conditioner is controlled and the second preset delay time is continued, the indoor fan is controlled to stop running. Specifically, the second preset delay time may be any value of 10s-1min, which is 30s in this application. During heating operation, the refrigerant in the outdoor heat exchanger is recovered, and the self-cleaning effect is affected if the indoor fan is continuously started at the moment, so that the indoor fan is controlled to stop running after 30 seconds, and the self-cleaning effect of the outdoor heat exchanger is ensured. In addition, if the air conditioner operates in a heating mode before entering the in-pipe self-cleaning mode, the indoor fan is turned off at the moment, so that the influence of the liquefaction of the refrigerant in the indoor heat exchanger on the self-cleaning effect can be avoided.
In one possible embodiment, the in-tube self-cleaning control method further comprises: and after controlling the air conditioner to perform refrigeration operation and lasting for a fourth set time, exiting the in-pipe self-cleaning mode. The fourth setting time may be any value from 3min to 10min, and is preferably 5min in the present application. When the refrigerating operation lasts for 5min, the high-temperature and high-pressure refrigerant is circulated for a plurality of times, so that a better in-pipe self-cleaning effect is generated, and when the on-off valve is opened for 5min, the in-pipe self-cleaning mode is exited.
Specifically, the step of exiting the in-tube self-cleaning mode further comprises: the method comprises the steps of controlling the air conditioner to resume mode operation before entering an in-pipe self-cleaning mode, controlling the compressor to keep self-cleaning frequency operation, controlling the throttling device to keep a preset opening degree, and controlling the second switching valve to be closed. After the in-pipe self-cleaning process is completed, the air conditioner needs to be restored to an operation mode before the in-pipe self-cleaning process to continuously adjust the indoor temperature. Taking the heating operation of the air conditioner before entering the in-pipe cleaning mode as an example, after the in-pipe self-cleaning mode is executed, the heating mode operation needs to be switched back. At the moment, the four-way valve is controlled to be electrified to restore the heat mode, the compressor is controlled to keep running at the self-cleaning frequency, the electronic expansion valve is controlled to keep a 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 heating mode. The preset opening is the maximum opening of the throttling device, and most of refrigerant circulates between the compressor and the outdoor heat exchanger when the pipe is in the self-cleaning mode operation, so that the refrigerant in the outdoor heat exchanger is lost, and the throttling device keeps the maximum opening, so that the refrigerant is rapidly filled in the indoor heat exchanger, and the normal circulation of the refrigerant is realized as soon as possible. The compressor still operates at self-cleaning frequency, namely highest limit frequency, so that the circulation speed of the refrigerant can be increased, and the coil temperature of the indoor heat exchanger can be rapidly reduced.
Correspondingly, after the throttle device is controlled to be opened to the preset opening and the fifth set time is continued, the throttle device is controlled to be restored to the opening before entering the in-pipe self-cleaning mode. The fifth setting time can be any value within 1min-5min, the application is preferably 3min, after the electronic expansion valve keeps the maximum opening degree to run for 3min, the refrigerant circulation tends to be stable, and at the moment, the electronic expansion valve is controlled to recover to the opening degree before entering the self-cleaning mode in the pipe, so that the heating parameters before the electronic expansion valve completely recovers to enter the self-cleaning mode in the pipe are continuously operated.
Accordingly, after the compressor is controlled to remain in 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 setting time can be any value within 1min-5min, the application is preferably 3min, when the compressor runs for 3min at the highest limiting value frequency, the temperature of the coil pipe of the indoor heat exchanger is rapidly reduced, and at the moment, the compressor is controlled to be restored to the frequency before entering the in-pipe self-cleaning mode, so that the heating parameters of the air conditioner are fully restored to the heating parameters before entering the in-pipe self-cleaning mode to continue running.
Of course, the mode of exiting the in-pipe self-cleaning mode is not limited to the above one, and a person skilled in the art may freely select a specific control mode without departing from the principles of the present application, on the premise that the air conditioner can be restored to the operation state before entering the in-pipe self-cleaning mode. For example, all the components can be directly controlled to be restored to the operation state before entering the in-pipe self-cleaning mode, or one or more components can be controlled to be restored to the operation state before entering the in-pipe self-cleaning mode, and then all the components can be gradually restored to the operation state before entering the in-pipe 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 procedure of the in-pipe self-cleaning control method of the outdoor heat exchanger of the present application.
As shown in fig. 4, in one possible implementation process, when the air conditioner is in heating operation, a user sends an instruction for in-pipe self-cleaning of the outdoor heat exchanger to the air conditioner through a remote controller button:
step S201 is executed firstly, the air conditioner enters an in-pipe self-cleaning mode, namely, the air conditioner is controlled to keep heating operation, the first on-off valve is closed, the second on-off valve is opened, the electronic expansion valve is closed to the minimum opening, the compressor is controlled to close the third on-off valve after 30S operation, and the indoor fan is stopped after 30S operation, so that the recovery of outdoor refrigerant is realized.
Step S203 is executed to control the compressor to raise the frequency to the highest limit frequency corresponding to the outdoor environment temperature.
Next, step S205 is performed to acquire the discharge temperature Td, discharge pressure Pd, and suction pressure Ps of the compressor.
Next, step S207 is executed to determine whether at least one of Td.gtoreq. T, pd.gtoreq.P1 and Ps.gtoreq.P2 is true, where T is the exhaust temperature threshold, P1 is the exhaust pressure threshold, and P2 is the suction pressure threshold. If at least one of the judgment results is satisfied, step S209 is executed, otherwise, if none of the three judgment conditions is satisfied, step S205 is executed again.
S209, controlling the air conditioner to perform refrigeration operation, keeping the first on-off valve closed, keeping the second on-off valve open, and keeping the third on-off valve open, and opening the electronic expansion valve to the maximum opening.
Step S211 is executed next, and whether the duration t1 of the refrigeration operation is more than or equal to 5min is met or not is judged; if the determination result is true, step S213 is executed, otherwise, if the determination result is false, the routine returns to continue step S211.
S213, exiting the in-pipe self-cleaning mode, specifically, controlling the air conditioner to operate in a heating mode, keeping the electronic expansion valve to the maximum opening degree, keeping the compressor to self-cleaning frequency, and closing the second on-off valve.
After the step S213, a step S215 is executed to judge whether the coil temperature Tp of the indoor heat exchanger is more than or equal to 40 ℃ or not; when the judgment result is positive, executing step S217, otherwise, returning to continue executing step S215;
s217, controlling the indoor fan to start running.
After step S213, step S219 is also executed to determine whether the duration t2 of the operation heating mode is equal to or longer than 3 min; when the determination result is true, step S221 is executed; otherwise, when the determination result is not established, the routine returns to step S219.
S221, controlling the electronic expansion valve to recover to the opening 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. The air conditioner is restored to the heating mode operation before entering the in-pipe self-cleaning mode.
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. For example, while the above-described three conditions of Td.gtoreq. T, pd.gtoreq.P1 and Ps.gtoreq.P2 are described in conjunction with the simultaneous determination in step S207, those skilled in the art will appreciate that the above-described three conditions may also be sequentially determined.
It should be noted that, although the above embodiment is described in connection with the operation heating mode of the air conditioner before entering the in-pipe self-cleaning mode, this is not intended to limit the scope of protection of the application, and when the air conditioner is operated in other modes, if an instruction for entering the in-pipe self-cleaning mode is received, the four-way valve is controlled to perform corresponding on-off switching. For example, on the premise of an air conditioner operation refrigeration mode, when an instruction for entering an in-pipe self-cleaning mode is received, the four-way valve is controlled to be powered off and switched to heating operation.
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 in-pipe self-cleaning control method 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 sequentially connected through refrigerant pipelines, the air conditioner further comprises a recovery pipeline, a first on-off valve and a second on-off valve, the first on-off valve is arranged on the refrigerant pipeline between the indoor heat exchanger and the throttling device, one end of the recovery pipeline is arranged on the refrigerant pipeline between the first on-off valve and the throttling device, the other end of the recovery pipeline is communicated with an air suction port of the compressor, the second on-off valve is arranged on the recovery pipeline,
the in-pipe self-cleaning control method comprises the following steps:
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 heating operation of the air conditioner;
controlling the first on-off valve to be closed, the second on-off valve to be opened, and the throttling device to be closed to the minimum opening;
controlling the compressor to adjust to a preset self-cleaning frequency;
obtaining the discharge temperature, discharge pressure and/or suction pressure of the compressor at intervals of a first interval;
determining whether a valve-off condition is established based on the obtained exhaust temperature, exhaust pressure, and/or intake pressure;
when the valve opening condition is met, controlling the air conditioner to perform refrigeration operation, and controlling the first on-off valve to be kept closed, the second on-off valve to be kept open and the throttling device to be opened to a preset opening degree.
2. The in-pipe self-cleaning control method of an outdoor heat exchanger according to claim 1, wherein the air conditioner further comprises a third on-off valve provided on a refrigerant pipe between the four-way valve and the indoor heat exchanger, the in-pipe self-cleaning control method further comprising:
after the air conditioner heats and runs and lasts for a first preset delay time, the third on-off valve is controlled to be closed; and
and when the valve opening condition is met, controlling the third on-off valve to be opened.
3. The in-pipe self-cleaning control method of an outdoor heat exchanger according to claim 1, wherein 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 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;
the inspiratory pressure is less than or equal to an inspiratory pressure threshold and lasts for a third set time.
4. The in-pipe self-cleaning control method of an outdoor heat exchanger according to claim 1, characterized in that the in-pipe self-cleaning control method further comprises:
and after the air conditioner heats and runs for a second preset delay time, controlling the indoor fan to stop running.
5. The in-pipe self-cleaning control method of an outdoor heat exchanger according to claim 4, characterized in that the in-pipe self-cleaning control method further comprises:
and after controlling the air conditioner to perform refrigeration operation and lasting for a fourth set time, exiting the in-pipe self-cleaning mode.
6. The in-pipe self-cleaning control method of an outdoor heat exchanger according to claim 5, wherein the step of exiting the in-pipe self-cleaning mode further comprises:
controlling the air conditioner to restore to the mode operation before entering the pipe for self-cleaning;
controlling the compressor to keep the self-cleaning frequency running;
controlling the throttling device to keep the preset opening;
and controlling the second on-off valve to be closed.
7. The in-pipe self-cleaning control method of an outdoor heat exchanger according to claim 6, characterized in that the in-pipe self-cleaning control method further comprises:
after the throttle device is controlled to keep the preset opening and the fifth set time is continued, controlling the throttle device to recover to the opening before entering the in-pipe self-cleaning mode; and/or
After the compressor keeps the self-cleaning frequency running for a sixth set time, controlling the compressor to restore to the frequency running before entering the pipe for self-cleaning.
8. The in-pipe self-cleaning control method of an outdoor heat exchanger according to claim 6, wherein the step of exiting the in-pipe self-cleaning mode further comprises:
when the temperature of the coil pipe of the indoor heat exchanger reaches the cold air prevention temperature, the indoor fan is controlled to start to operate.
9. The in-pipe self-cleaning control method of an outdoor heat exchanger according to claim 1 or 6, wherein the preset opening degree is a maximum opening degree of the throttle device.
10. The in-pipe self-cleaning control method of an outdoor heat exchanger according to claim 1, wherein the self-cleaning frequency is a highest limit frequency corresponding to an outdoor ambient temperature.
Priority Applications (2)
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| CN202110802941.7A CN113654191B (en) | 2021-07-15 | 2021-07-15 | In-pipe self-cleaning control method of outdoor heat exchanger |
| PCT/CN2021/129796 WO2023284195A1 (en) | 2021-07-15 | 2021-11-10 | In-pipe self-cleaning control method of outdoor heat exchanger |
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| CN202110802941.7A CN113654191B (en) | 2021-07-15 | 2021-07-15 | In-pipe self-cleaning control method of outdoor heat exchanger |
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