CN113483448B - Method for recovering oil stain in pipe of indoor unit - Google Patents

Method for recovering oil stain in pipe of indoor unit Download PDF

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Publication number
CN113483448B
CN113483448B CN202110777926.1A CN202110777926A CN113483448B CN 113483448 B CN113483448 B CN 113483448B CN 202110777926 A CN202110777926 A CN 202110777926A CN 113483448 B CN113483448 B CN 113483448B
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pipe
indoor unit
controlling
oil stain
air conditioner
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CN113483448A (en
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罗荣邦
于文文
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Priority to CN202110777926.1A priority Critical patent/CN113483448B/en
Publication of CN113483448A publication Critical patent/CN113483448A/en
Priority to PCT/CN2021/129818 priority patent/WO2023279615A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (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 recovering oil stain in a pipe of an indoor unit. This application aims at solving the problem of how to realize the intraductal greasy dirt of indoor set and retrieve. For this purpose, the air conditioner of this application still includes the recovery pipeline, and its one end and outdoor heat exchanger export intercommunication, the other end and compressor induction port intercommunication are provided with the on-off valve on the recovery pipeline. The method comprises the following steps: entering an indoor machine pipe oil stain recovery mode; controlling the air conditioner to run in a refrigeration mode; controlling the compressor to adjust to a preset first recovery frequency; adjusting the opening degree of the throttling device to enable the temperature of a coil of the indoor heat exchanger to be less than or equal to a preset temperature; when the temperature of the coil pipe is less than or equal to the preset temperature and lasts for a first preset time, controlling the air conditioner to be switched into a heating mode; and controlling the on-off valve to be opened and the throttling device to be opened to a preset opening degree. The method can be used for recovering oil stain in the pipe of the indoor unit, and the problem of pipe filth blockage of the indoor heat exchanger is solved.

Description

Method for recovering oil stain in pipe of indoor unit
Technical Field
The invention relates to the technical field of air conditioner self-cleaning, in particular to a method for recovering oil stain in a pipe of an indoor unit.
Background
For an indoor unit of an air conditioner, in the using process, refrigerating machine oil can participate in circulation along with a refrigerant, in the circulation process, the refrigerating machine oil can generate carbon formation and impurities, oil stains flow to a hairpin pipe of an indoor heat exchanger along with the refrigerant, the flowing of the refrigerating machine oil is influenced because the existing hairpin pipe is an internal thread copper pipe, and in addition, the oil stains cannot return to the inside of a compressor in time under the action of centrifugal force of the flowing refrigerant, the oil stains stay on the inner wall of the threaded copper pipe, the heat transfer between the refrigerant and a coil pipe is hindered, the heat transfer temperature difference is reduced, and the refrigerating effect of the air conditioner is poor.
Accordingly, there is a need in the art for a new method of recovering oil contamination inside a pipe of an indoor unit to solve the above problems.
Disclosure of Invention
In order to solve at least one problem in the prior art, namely to solve the problem of how to recover the oil stain in the pipe of the indoor unit, the application provides a method for recovering the oil stain in the pipe of the indoor unit, which is applied to an air conditioner, wherein the air conditioner comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling device and an indoor heat exchanger which are connected through refrigerant pipelines, the air conditioner also comprises a recovery pipeline, one end of the recovery pipeline is communicated with an outlet of the outdoor heat exchanger, the other end of the recovery pipeline is communicated with an air suction port of the compressor, an on-off valve is arranged on the recovery pipeline, and the on-off valve is a normally-closed valve,
the method comprises the following steps:
responding to a received instruction for recovering the oil stain in the indoor unit pipe, and entering an indoor unit pipe oil stain recovery mode;
controlling the air conditioner to operate in a refrigeration mode;
controlling the compressor to adjust to a preset first recovery frequency;
adjusting the opening degree of the throttling device to enable the temperature of a coil of the indoor heat exchanger to be less than or equal to a preset temperature;
when the temperature of the coil pipe is less than or equal to the preset temperature and lasts for a first preset time, controlling the air conditioner to be switched into a heating mode;
controlling the on-off valve to be opened and the throttling device to be opened to a preset opening degree;
wherein the preset temperature is greater than the freezing temperature of the refrigerating machine oil.
In a preferred embodiment of the method for recovering oil contamination inside a pipe of the indoor unit, after the step of "controlling the air conditioner to switch to the heating mode", the method further includes:
and controlling the compressor to adjust to a preset second recovery frequency.
In a preferred technical solution of the method for recovering oil contamination in a pipe of the indoor unit, the second recovery frequency is a maximum limit frequency corresponding to an outdoor ambient temperature.
In a preferred embodiment of the method for recovering oil contamination inside a pipe of an indoor unit, before the step of "adjusting the opening degree of the throttling device", the method further includes:
and controlling the outdoor fan to operate at the highest rotating speed.
In a preferred technical scheme of the method for recovering the oil stain in the pipe of the indoor unit, the preset opening is the maximum opening of the throttling device.
In a preferred embodiment of the method for recovering oil contamination inside a pipe of an indoor unit, before the step of "adjusting the opening degree of the throttle device", the method further includes:
and controlling the indoor fan to stop running.
In a preferred technical solution of the method for recovering oil stain in the pipe of the indoor unit, the method further comprises:
and when the indoor unit pipe oil stain recovery mode is entered, the indoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed.
In a preferred technical solution of the method for recovering oil contamination in a pipe of the indoor unit, after the step of "controlling the on-off valve to be opened and the throttling device to be opened to a preset opening", the method further includes:
and after the on-off valve is opened and the throttling device is opened to the preset opening degree for a second preset time, the indoor unit pipe oil stain recovery mode is exited.
In a preferred technical solution of the method for recovering oil contamination in a tube of an indoor unit, the step of exiting the indoor unit tube oil contamination recovery mode further includes:
controlling the air conditioner to recover to an operation mode before entering an indoor unit pipe oil stain recovery mode;
controlling the frequency of the compressor to recover to the frequency before entering the indoor unit pipe oil stain recovery mode;
and controlling the on-off valve to close.
In the preferable technical solution of the method for recovering oil stain in the pipe of the indoor unit, the step of exiting the indoor unit pipe oil stain recovery mode further comprises:
controlling an 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 third preset time, controlling the indoor fan and the air deflector to recover to the running state before entering the indoor unit pipe oil stain recovery mode.
It should be noted that, in the preferred technical scheme of this application, the air conditioner includes compressor, cross valve, outdoor heat exchanger, throttling arrangement, indoor heat exchanger through refrigerant tube coupling, and the air conditioner still includes the recovery pipeline, and the one end of recovery pipeline communicates with the export of outdoor heat exchanger, and the other end of recovery pipeline communicates with the induction port of compressor, is provided with the on-off valve on the recovery pipeline, and the on-off valve is the normally closed valve, and the method includes: responding to a received instruction for recovering the oil stain in the indoor unit pipe, and entering an indoor unit pipe oil stain recovery mode; controlling the air conditioner to run in a refrigeration mode; controlling the compressor to adjust to a preset first recovery frequency; adjusting the opening degree of the throttling device to enable the temperature of a coil pipe of the indoor heat exchanger to be less than or equal to a preset temperature; when the temperature of the coil pipe is less than or equal to the preset temperature and lasts for a first preset time, controlling the air conditioner to be switched into a heating mode; controlling the on-off valve to be opened and the throttling device to be opened to a preset opening degree; wherein the preset temperature is higher than the freezing temperature of the refrigerating machine oil.
By means of the control mode, oil stain in the pipe of the indoor unit can be recovered, and the problem that the pipe of the indoor heat exchanger is dirty and blocked is solved. Specifically, the air conditioner is controlled to firstly run a refrigeration mode, the opening degree of the throttling device is adjusted to enable the temperature of the coil of the indoor heat exchanger to be less than or equal to a preset temperature, the oil stain of the refrigerating machine oil and the oil stain are large in viscosity, the freezing point is higher than that of a refrigerant, and the oil stain freezing point is higher than that of the oil stain, so that the oil stain in the refrigerating machine oil is firstly solidified and stripped from the refrigerant circulation in the process of temperature reduction of the refrigerant and is attached to the inner wall of the coil of the indoor heat exchanger, and the normal refrigerating machine oil returns to the compressor along with the circulation of the refrigerant, so that the oil stain in the refrigerant is separated and temporarily stored in the coil of the indoor heat exchanger. After the coil pipe temperature is less than or equal to the preset temperature and lasts for the first preset time, the air-conditioning heat exchanger is controlled to be converted into a heating mode, the on-off valve and the throttling device are opened, the quick flowing of the high-temperature and high-pressure refrigerant can be utilized to impact the interior of the coil pipe of the indoor heat exchanger, oil stains temporarily stored in the interior of the coil pipe are melted at high temperature and directly return to the interior of the compressor along with the refrigerant through the recovery pipeline, and oil stain recovery of the indoor heat exchanger is achieved. In addition, through setting up the recovery pipeline, can realize directly retrieving in taking the greasy dirt back compressor at greasy dirt recovery process, reduce the flow stroke of high temperature refrigerant, reduce the pressure drop of refrigerant, improve greasy dirt recovery effect, practice thrift greasy dirt recovery time, guarantee user experience.
Drawings
The method for recovering oil contamination inside a pipe of the indoor unit of the present application will be described with reference to the accompanying drawings. In the drawings:
FIG. 1 is a system diagram of an air conditioner of the present application in a 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 recovering oil stain in a pipe of an indoor unit according to the present application;
fig. 4 is a logic diagram of a possible implementation process of the method for recovering oil stain in the pipe of the indoor unit of 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. an on-off valve; 9. reservoir, 10, temperature sensor.
Detailed Description
Preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principles of the present application, and are not intended to limit the scope of the present application. For example, although the following detailed description describes the detailed steps of the method of the present application, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present application, and the modified technical solution does not change the basic concept of the present application and therefore falls within the protection scope of the present application.
It should be noted that the terms "first", "second", "third" and "fourth" in the description of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It should also be noted that, unless expressly stated or limited otherwise, the term "coupled" is used in the description of the invention in its broadest sense, and thus, for example, may be fixedly coupled, releasably coupled, or integrally coupled; 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 throttling device 4, an indoor heat exchanger 5, and an accumulator 9. 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 9, the export of reservoir 9 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 9, and the liquid storage device 9 can play roles in storing refrigerants, separating refrigerant gas and liquid, filtering oil stains, silencing, buffering the refrigerants and the like.
The air conditioner further comprises a recovery pipeline 7 and an on-off valve 8, wherein the recovery pipeline 7 is a copper pipe with a smooth inner wall, the first end of the copper pipe is arranged on a refrigerant pipeline 6 between the outlet of the outdoor heat exchanger 3 and the throttling device 4, 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 the inlet of the liquid storage device 9. The on-off valve 8 is preferably a solenoid valve which is a normally closed valve and is arranged on the recovery pipeline 7, and the solenoid valve is in communication connection with a controller of the air conditioner to receive opening and closing signals sent by the controller. Of course, the on-off valve 8 may be an electrically controlled valve such as an electronic expansion valve.
In order to implement the following method, a temperature sensor 10 is further disposed on the coil of the indoor heat exchanger 5, and the temperature sensor 10 is used for detecting the coil temperature of the indoor heat exchanger 5. The principle of detecting the temperature of the coil of the heat exchanger by the temperature sensor 10 is well known in the art and will not be described herein.
The method for recovering oil contamination inside the pipe of the indoor unit in the following embodiment will be described with reference to 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 always the same, and those skilled in the art may adjust the method, for example, add or delete components on the basis of the structure of the air conditioner.
The method for recovering oil stain in the pipe of the indoor unit of the present application will be described with reference to fig. 1, 2 and 3. Wherein, fig. 2 is a system diagram of the air conditioner of the present application in a heating mode; fig. 3 is a flowchart of a method for recovering oil contamination inside a pipe of an indoor unit according to the present application.
As shown in fig. 3, in order to solve the problem of how to recover the oil stain in the pipe of the indoor unit, the method for recovering the oil stain in the pipe of the indoor unit according to the present application includes:
s101, responding to a received instruction for recovering oil stain in the indoor unit pipe, and entering an indoor unit pipe oil stain recovery mode.
In a possible embodiment, carry out the instruction that intraductal greasy dirt was retrieved to indoor set and 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 for recovering oil stain in the pipe of the indoor unit, the air conditioner switches the operation mode to the indoor unit pipe oil stain recovery mode, and starts to recover the oil stain in the pipe of the coil pipe of the indoor unit. The oil stain recycling mode in the pipe can be a computer program which is stored in the air conditioner in advance, and when the air conditioner runs in the mode, the air conditioner controls the running of all parts of the air conditioner according to the steps set by the program.
Of course, the indoor unit pipe oil stain recovery instruction may also be automatically sent out when the air conditioner reaches certain entering conditions, for example, when the accumulated working time of the air conditioner reaches a preset time, an instruction for performing pipe oil stain recovery on the indoor unit is sent out, and the preset time may be 20h-40h, for example.
And S103, controlling the air conditioner to operate in a cooling mode.
In one possible embodiment, the switching between the operation modes of the air conditioner is controlled by controlling the power on and off of the four-way valve, for example, when the four-way valve is powered off, the air conditioner operates in a cooling mode, and when the four-way valve is powered on, the air conditioner operates in a heating mode. In the embodiment, after entering the indoor unit pipe oil stain recovery 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 compressor to adjust to a preset first recovery frequency.
In one possible embodiment, the first recovery frequency is a frequency determined in advance through experiments, and for example, may be determined based on the correspondence relationship between the outdoor ambient temperature and the first recovery frequency as shown in table 1 below. When the compressor is operating at the first recovery frequency, it facilitates implementation of a subsequent control process.
TABLE 1 comparison table of outdoor ambient temperature and first recovery frequency
Outdoor ambient temperature (. Degree. C.) First recovery frequency (Hz)
Tao≤16 50
16＜Tao≤22 60
22＜Tao≤29 70
29＜Tao≤35 80
35＜Tao≤43 85
43＜Tao≤52 78
Tao＞52 72
And S107, controlling the opening degree of the throttling device to enable the temperature of the coil of the indoor heat exchanger to be less than or equal to a preset temperature.
In a possible implementation manner, the temperature of the coil of the indoor heat exchanger is detected by the temperature sensor, and the opening degree of the electronic expansion valve is dynamically adjusted, so that the temperature of the coil of the indoor heat exchanger is less than or equal to a preset temperature. Preferably, the preset temperature is greater than the freezing temperature of the refrigerating machine oil, so that the freezing points of the refrigerating machine oil and the refrigerant are far lower than the freezing point of the oil stain, the preset temperature is set to be greater than the freezing temperature of the refrigerating machine oil, the oil stain is firstly solidified and separated out when the temperature of the coil pipe is less than or equal to the preset temperature, and the refrigerating machine oil and the refrigerant normally circulate. The freezing point of the refrigerator oil is different for different models of refrigerator oil, so the specific value of the preset temperature is determined based on the model of the refrigerator oil, for example, the freezing point of the refrigerator oil is below-50 ℃ to ensure the fluidity, so the preset temperature can be set to-5 ℃ to-25 ℃ in the application, and the preset temperature can be-10 ℃ in the application. That is to say, the coil temperature of the indoor heat exchanger is equal to or lower than the preset temperature as the control purpose, and the coil temperature of the indoor heat exchanger is always in the state of equal to or lower than the preset temperature by adjusting the opening degree of the electronic expansion valve (such as PID adjustment).
Referring to fig. 1, when the air conditioner operates in a cooling mode, the temperature of the coil of the indoor heat exchanger is maintained at a temperature of-10 ℃ or lower, and at this time, oil stains in the indoor heat exchanger are stripped from the refrigerant cycle and attached to the inner wall of the coil of the indoor heat exchanger.
Of course, in other embodiments, the coil temperature of the indoor heat exchanger may be less than or equal to the preset temperature by adjusting the opening degree of the electronic expansion valve to a fixed opening degree.
And S109, controlling the air conditioner to be switched into a heating mode after the temperature of the coil pipe is less than or equal to the preset temperature and lasts for a first preset time.
In a possible embodiment, the first preset time period may be any value within 5-15 min. Preferably, in this embodiment, the first preset time period is 10min, after the temperature of the coil pipe is less than or equal to-10 ℃ and lasts for 10min, the oil stains in the indoor heat exchanger have been peeled, and at this time, the peeled oil stains may be recovered. At this time, the switching between the operation modes of the air conditioner is controlled by controlling the on-off of the four-way valve, for example, the four-way valve is controlled to be powered on, and the air conditioner operates in a heating mode.
And S111, controlling the on-off valve to be opened and controlling the throttling device to be opened to a preset opening degree.
In one possible embodiment, the throttle device and the on-off valve are controlled to open after the operating mode is switched to the heating mode. At this time, as shown by the arrow in fig. 2, the high-temperature and high-pressure refrigerant discharged by the compressor flows through the indoor heat exchanger, the high-temperature and high-pressure refrigerant quickly impacts the coil pipe of the indoor heat exchanger, oil stains temporarily stored in the coil pipe are melted, and the high-temperature refrigerant directly flows back to the liquid storage device through the recovery pipeline and is intercepted and filtered by the filter screen in the liquid storage device, so that the purpose of recovering the oil stains is achieved. Preferably, the throttle device is controlled to be opened to the maximum opening degree, so that the high-temperature and high-pressure refrigerant can rapidly pass through the throttle device, the pressure drop in the flowing process of the refrigerant is reduced, and the oil stain recovery effect in the pipe is improved.
It can be seen that the refrigeration mode is firstly operated by controlling the air conditioner, and the opening degree of the throttling device is adjusted to enable the temperature of the coil pipe of the indoor heat exchanger to be less than or equal to the preset temperature, because the viscosity of the refrigerating machine oil and the oil stain is very large, the freezing point is higher than that of the refrigerant, and the freezing machine oil is higher than the freezing point of the oil stain, the oil stain in the refrigerating machine oil is firstly solidified and stripped from the refrigerant circulation in the process of the temperature reduction of the refrigerant and attached to the inner wall of the coil pipe of the indoor heat exchanger, and the normal refrigerating machine oil returns to the compressor along with the circulation of the refrigerant, so that the oil stain in the refrigerant is separated and temporarily stored in the coil pipe of the indoor heat exchanger. After coil pipe temperature less than or equal to preset the temperature and last for first presetting time, control air conditioner heat exchanger and convert the mode of heating to open on-off valve and throttling arrangement, can utilize the quick flow of high temperature high pressure refrigerant to strike indoor heat exchanger's coil pipe inside, the greasy dirt of temporary storage in the coil pipe inside is melted by high temperature and directly returns to inside the reservoir along with the refrigerant by the recovery pipeline, realizes retrieving the greasy dirt of indoor heat exchanger.
In addition, through setting up the recovery pipeline in the air conditioner, this application can be in carrying out the intraductal greasy dirt recovery process to indoor heat exchanger, utilize the recovery pipeline to realize the recovery to the greasy dirt, realize that high temperature high pressure refrigerant is scouring away the back to 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 high temperature refrigerant has been reduced, reduce along journey pressure drop, improve intraductal greasy dirt recovery effect.
In one possible embodiment, after the step of controlling the air conditioner to be switched to the heating mode, the method further includes: and controlling the compressor to adjust to a preset second recovery frequency. The second recovery frequency is preferably a maximum limit 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 a protection mechanism, the maximum limit frequency is correspondingly set under different outdoor environment temperatures, the second recovery frequency is the maximum limit frequency of the compressor under the current outdoor environment temperature, and under the frequency limit, the temperature and the pressure of the refrigerant can be improved by the compressor in the shortest time, so that the oil stain recovery effect is improved. The manner of acquiring the outdoor ambient temperature is a conventional means in the art, and is not described herein again.
In one possible embodiment, before the step of "adjusting the opening degree of the throttle device", the method further comprises: and controlling the outdoor fan to operate at the highest rotating speed. Specifically, before the aperture of the throttling device is adjusted, the outdoor fan is controlled to operate at the highest rotating speed, the heat exchange effect between the refrigerant and the environment in the outdoor heat exchanger can be improved, the temperature and the pressure of the refrigerant are reduced, the evaporation effect of the refrigerant in the indoor heat exchanger is improved, and the indoor coil is reduced to the preset temperature at a higher speed.
In one possible embodiment, before the step of "adjusting the opening degree of the throttle device", the method further comprises: and controlling the indoor fan to stop running. Specifically, before adjusting throttling arrangement's aperture, at first control indoor fan bring to rest to reduce the heat transfer effect between indoor heat exchanger and the air, thereby can accelerate the reducing rate of indoor coil's temperature, promote greasy dirt recovery efficiency.
In one possible embodiment, the method further comprises: and when the indoor unit pipe oil stain recovery mode is entered, the indoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed. Because the temperature of the coil pipe of the indoor heat exchanger needs to be reduced to a lower value, the compressor needs to be operated at high frequency in order to reach the condition as soon as possible, and therefore in the process of refrigerating operation, the indoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed, so that the method can be smoothly executed. However, other protection functions are normally started, such as compressor exhaust protection, current overload protection and the like, and the functions are kept started, so that adverse effects on the service life of the air conditioner are prevented.
Certainly, the specific control process of the indoor unit oil stain recovery mode is not unique, and a person skilled in the art can adjust the control mode on the premise of ensuring that the refrigeration mode is firstly operated to enable the temperature of the coil to be less than or equal to the preset temperature, then the operation is converted into the heating mode, and the on-off valve and the throttling device are opened. For example, one or more of the operation frequency of the compressor, the opening degree of the electronic expansion valve, the rotation speed of the indoor fan, and the rotation speed of the outdoor fan in the above control manner may be omitted on the premise that the coil temperature of the indoor heat exchanger can be maintained at a preset temperature or lower. For another example, when the oil stain recovery mode in the pipe is executed, the rotating speed of the outdoor fan can be determined according to the outdoor environment temperature, and then the outdoor fan is controlled to operate.
In one possible embodiment, the method further comprises: and after the on-off valve is opened and the throttling device is opened to the preset opening degree for a second preset time, the indoor unit pipe oil stain recovery mode is exited. The second preset time period can be any value from 3min to 10min, and the second preset time period is preferably 5min. When the opening time of the throttling device and the on-off valve lasts for 5min, the high-temperature and high-pressure refrigerant is circulated for many times, and a good oil stain recovery effect in the pipe can be achieved, so that the oil stain recovery mode in the pipe of the indoor unit is exited when the throttling device and the on-off valve are opened for 5min.
Specifically, the step of exiting the indoor unit pipe oil stain recovery mode further comprises: the air conditioner is controlled to recover to an operation mode before entering an indoor unit pipe oil stain recovery mode, the compressor is controlled to recover to a frequency before entering the indoor unit pipe oil stain recovery mode, an indoor fan is controlled to be started, an air deflector of an indoor unit is controlled to supply air upwards, a throttling device is controlled to keep the maximum opening degree, and an on-off valve is controlled to be closed. After the oil stain recovery process in the pipe is finished, the air conditioner needs to be recovered to the operation mode before the oil stain in the pipe is recovered so as to continuously adjust the indoor temperature. Taking the air conditioner running refrigeration mode before entering the indoor unit pipe oil stain recovery mode as an example, after the indoor unit pipe oil stain recovery mode is executed, the air conditioner needs to be switched back to the refrigeration mode to run. And at the moment, the four-way valve is controlled to be powered off to recover the refrigeration mode, the compressor is controlled to recover the frequency from the second recovery frequency to the frequency before entering the oil stain recovery mode in the indoor unit pipe, the indoor fan is controlled to be started, the air deflector of the indoor unit supplies air upwards, the electronic expansion valve is controlled to keep the maximum opening degree, and the on-off valve is controlled to be closed, so that the refrigerant flows in the flow direction of the normal refrigeration mode. The air guide plate of the indoor unit supplies air upwards when the indoor fan is started, so that bad use experience brought to a user by air outlet due to overhigh temperature of the coil pipe of the indoor heat exchanger when the air conditioner is just switched to a refrigeration mode is prevented. The throttling device keeps the maximum opening degree, and refrigerant circulates between the compressor and the indoor heat exchanger when the indoor unit runs in an oil stain recovery mode, so that refrigerant in the outdoor heat exchanger is lost, the throttling device keeps the maximum opening degree, the refrigerant is enabled to be filled in the outdoor heat exchanger quickly, and normal circulation of the refrigerant is achieved as soon as possible.
Correspondingly, after the air deflector is controlled to supply air upwards for a third preset time, the indoor fan and the air deflector are controlled to recover to the running state before entering the indoor pipeline oil stain recovery mode. The third preset time can be any value within 20s-1min, the third preset time is preferably 30s, after the indoor fan is started and the air deflector supplies air upwards for 30s, the temperature of the coil pipe of the indoor heat exchanger is reduced to the temperature matched with the refrigeration mode, and the indoor fan and the air deflector are controlled to recover to the operation mode before entering the indoor fan pipe oil stain recovery mode, so that the refrigeration requirements of users are met.
Correspondingly, after the throttling device is controlled to keep the maximum opening degree and lasts for a fourth preset time, the throttling device is controlled to recover the opening degree before entering the oil stain recovery mode in the indoor machine pipe. The fourth preset time can be any value within 1-5 min, the application is preferably 3min, after the electronic expansion valve keeps the maximum opening degree and operates for 3min, the refrigerant circulation tends to be stable, and the electronic expansion valve is controlled to recover to the opening degree before entering the indoor unit pipe oil stain recovery mode, so that the air conditioner completely recovers the refrigeration parameters before entering the indoor unit pipe oil stain recovery mode and continues to operate.
Of course, the mode of exiting the indoor unit pipe oil stain recovery mode is not limited to the above one, and a person skilled in the art can freely select a specific control mode on the premise that the air conditioner can be restored to the operation state before entering the indoor unit pipe oil stain recovery mode, and the selection does not deviate from the principle of the present application. For example, the outdoor fan can be controlled to be recovered to the running state before entering the indoor pipeline oil stain recovery mode; for another example, after the temperature of the coil of the indoor heat exchanger is reduced to a temperature suitable for the refrigeration mode, the indoor fan can be controlled to start and operate.
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 recovering oil contamination in a pipe of an indoor unit according to the present application.
As shown in fig. 4, in a possible implementation process, when the air conditioner operates in the cooling mode, a user sends an instruction for recovering oil stain in the pipe of the indoor unit to the air conditioner through a remote controller key:
firstly, step S201 is executed, the air conditioner enters an indoor unit pipe oil stain recovery mode, namely, the air conditioner is controlled to keep a refrigeration mode to operate, a compressor is controlled to adjust to a first recovery frequency, an indoor fan is controlled to stop operating, and an outdoor fan is controlled to operate at the maximum rotating speed.
Next, step S203 is executed to adjust the opening degree of the throttle device and obtain the coil temperature Tp of the indoor heat exchanger.
And step S205 is executed next, whether the coil temperature Tp of the indoor heat exchanger is less than or equal to-10 ℃ and the duration t1 is greater than or equal to 10min are simultaneously established or not is judged, when the coil temperature Tp is less than or equal to-10 ℃, step S207 is executed, otherwise, when the coil temperature Tp and the duration t1 are not simultaneously established, the step S203 is executed in a returning mode.
And S207, controlling the air conditioner to operate in a heating mode, controlling the compressor to adjust to the maximum limit frequency corresponding to the outdoor environment temperature, controlling the electromagnetic valve to open, and controlling the electronic expansion valve to open to the maximum opening.
Step S209 is executed next, and whether the duration time t2 for opening the electronic expansion valve and the electromagnetic valve together is more than or equal to 5min is judged; if the determination result is true, step S211 is executed, otherwise, if the determination result is false, the process returns to continue to execute step S209.
And S211, exiting the oil stain recovery mode in the pipe, specifically, controlling the air conditioner to operate in a refrigeration mode, controlling the electronic expansion valve to keep the maximum opening degree, controlling the indoor fan to be opened and the air deflector to blow upwards, controlling the frequency of the compressor to recover to the frequency before entering the oil stain recovery mode in the indoor unit pipe, and controlling the electromagnetic valve to be closed.
Step S213 is executed next, and whether the time t3 for opening the indoor fan is more than or equal to 30S is judged; when the judgment result is satisfied, executing step S215, otherwise, returning to continue executing step S213;
s215, controlling the indoor fan and the air deflector to recover the running state before the indoor fan enters the indoor unit pipe oil stain recovery mode.
Step S217 is executed next, and whether the duration time t4 for keeping the maximum opening of the electronic expansion valve is more than or equal to 3min is judged; if the determination result is true, step S219 is executed; otherwise, if the determination result is false, the process returns to continue to step S217.
And S219, controlling the electronic expansion valve to recover to the opening before entering the indoor unit pipe oil stain recovery mode, and then recovering the air conditioner to run in the refrigeration mode before entering the indoor unit pipe oil stain recovery mode.
Those skilled in the art will appreciate that the above-described air conditioner may also include other known structures, such as a processor, a controller, a memory, etc., wherein the memory includes, but is not limited to, a random access memory, a flash memory, a read only memory, a programmable read only memory, a volatile memory, a non-volatile memory, a serial memory, a parallel memory or a register, etc., and the processor includes, but is not limited to, a CPLD/FPGA, a DSP, an ARM processor, a MIPS processor, etc. Such well-known structures are not shown in the drawings in order to not unnecessarily obscure embodiments of the present disclosure.
Although the foregoing embodiments describe the steps in 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.
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 oil stain recovery method of an indoor unit 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 connected through refrigerant pipelines, the air conditioner also comprises a recovery pipeline, one end of the recovery pipeline is communicated with an outlet of the outdoor heat exchanger, the other end of the recovery pipeline is communicated with an air suction port of the compressor, an on-off valve is arranged on the recovery pipeline, the on-off valve is a normally-closed valve,
the method comprises the following steps:
responding to a received instruction for recovering the oil stain in the indoor unit pipe, and entering an indoor unit pipe oil stain recovery mode;
controlling the air conditioner to operate in a refrigeration mode;
controlling the compressor to adjust to a preset first recovery frequency;
adjusting the opening degree of the throttling device to enable the temperature of a coil of the indoor heat exchanger to be less than or equal to a preset temperature;
when the temperature of the coil pipe is less than or equal to the preset temperature and lasts for a first preset time, controlling the air conditioner to be switched into a heating mode;
controlling the on-off valve to be opened and the throttling device to be opened to a preset opening degree;
wherein the preset temperature is greater than the freezing temperature of the refrigerating machine oil.
2. The method for recovering oil contamination inside a pipe of an indoor unit according to claim 1, wherein after the step of 'controlling the air conditioner to be switched to a heating mode', the method further comprises:
and controlling the compressor to adjust to a preset second recovery frequency.
3. The method for recovering oil contamination inside a pipe of an indoor unit of claim 2, wherein the second recovery frequency is a maximum limit frequency corresponding to an outdoor ambient temperature.
4. The method for recovering oil stain in a pipe of an indoor unit according to claim 1, wherein before the step of adjusting the opening degree of the throttling means, the method further comprises:
and controlling the outdoor fan to operate at the highest rotating speed.
5. The method for recovering oil contamination inside a pipe of an indoor unit according to claim 1, wherein the preset opening degree is a maximum opening degree of the throttle device.
6. The method for recovering oil stain in a pipe of an indoor unit according to claim 1, wherein before the step of adjusting the opening degree of the throttling means, the method further comprises:
and controlling the indoor fan to stop running.
7. The method for recovering oil stain in a pipe of an indoor unit according to claim 1, further comprising:
and when the indoor unit pipe oil stain recovery mode is entered, the indoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed.
8. The method for recovering oil stain in a pipe of an indoor unit according to claim 6, wherein after the step of controlling the on-off valve to be opened and the throttling device to be opened to a preset opening degree, the method further comprises:
and after the on-off valve is opened and the throttling device is opened to the preset opening degree for a second preset time, the indoor unit pipe oil stain recovery mode is exited.
9. The indoor unit oil contamination recycling method of claim 8, wherein the step of exiting the indoor unit oil contamination recycling mode further comprises:
controlling the air conditioner to recover to an operation mode before entering an indoor unit pipe oil stain recovery mode;
controlling the frequency of the compressor to recover to the frequency before entering the indoor unit pipe oil stain recovery mode;
and controlling the on-off valve to be closed.
10. The indoor unit oil contamination recycling method of claim 9, wherein the step of exiting the indoor unit oil contamination recycling mode further comprises:
controlling an indoor fan to be started, and controlling an air deflector of an indoor unit to supply air upwards;
and after controlling the air deflector to supply air upwards for a third preset time, controlling the indoor fan and the air deflector to recover to the running state before entering the indoor unit pipe oil stain recovery mode.
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