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CN113483475B - Method for recovering and controlling oil stain in pipe of outdoor unit - Google Patents

Method for recovering and controlling oil stain in pipe of outdoor unit Download PDF

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Publication number
CN113483475B
CN113483475B CN202110777927.6A CN202110777927A CN113483475B CN 113483475 B CN113483475 B CN 113483475B CN 202110777927 A CN202110777927 A CN 202110777927A CN 113483475 B CN113483475 B CN 113483475B
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China
Prior art keywords
controlling
temperature
recovery
air conditioner
pipe
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CN202110777927.6A
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CN113483475A (en
Inventor
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
Original Assignee
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Application filed by Qingdao Haier Air Conditioner Gen Corp Ltd, Qingdao Haier Air Conditioning Electric Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Air Conditioner Gen Corp Ltd
Priority to CN202110777927.6A priority Critical patent/CN113483475B/en
Publication of CN113483475A publication Critical patent/CN113483475A/en
Priority to PCT/CN2021/129797 priority patent/WO2023279608A1/en
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Publication of CN113483475B publication Critical patent/CN113483475B/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
    • F24F11/62—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
    • F24F11/50—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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Mathematical Physics (AREA)
  • Fuzzy Systems (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Human Computer Interaction (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 and controlling oil stain in a pipe of an outdoor unit. This application aims at solving the problem that how to realize the intraductal greasy dirt of off-premises station and retrieve. To this end, the air conditioner of this application includes the recovery pipeline, and its one end and outdoor heat exchanger import intercommunication, the other end and compressor induction port intercommunication are equipped with the on-off valve on the recovery pipeline. The method comprises the following steps: responding to a received command of recovering the oil stain in the pipe, and entering an outdoor unit pipe oil stain recovery mode; controlling the air conditioner to operate in a heating 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 outdoor 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 refrigeration mode; and controlling the on-off valve to be opened and the throttling device to be closed to the minimum opening degree. This application can realize retrieving the intraductal greasy dirt of off-premises station.

Description

Method for recovering and controlling oil stain in pipe of outdoor unit
Technical Field
The invention relates to the technical field of air conditioner self-cleaning, in particular to a method for recovering and controlling oil stain in a pipe of an outdoor unit.
Background
For the air condensing units, in the use, the refrigerating machine oil can participate in the circulation along with the refrigerant together, in the circulation process, carbon formation and impurities can appear in the refrigerating machine oil, these greasy dirt accompany the hairpin pipe that the refrigerant flows to outdoor heat exchanger, because the present hairpin pipe is the internal thread copper pipe, influence the flow of refrigerating machine oil, in addition the centrifugal force effect that the refrigerant flows, lead to inside machine oil and greasy dirt can not in time return the compressor, stop at the copper pipe inner wall of screw thread form, hinder the heat transfer between refrigerant and the coil pipe, the heat transfer difference is reduced, make the air conditioner heat effect worsen.
Accordingly, there is a need in the art for a new method for controlling oil contamination recovery in a pipe of an outdoor 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 oil stain in the pipe of the outdoor unit, the application provides a method for recovering and controlling oil stain in the pipe of the outdoor unit, which is applied to an air conditioner, 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 inlet of the outdoor heat exchanger, the other end of the recovery pipeline is communicated with an air suction port of the compressor, an on-off valve is arranged on the recovery pipeline, and the on-off valve is a normally-closed valve,
the control method comprises the following steps:
responding to a received instruction for recovering oil stain in the outdoor unit, and entering an outdoor unit oil stain recovery mode;
controlling the air conditioner to operate in a heating 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 outdoor 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 refrigeration mode;
controlling the on-off valve to be opened and the throttling device to be closed to the minimum 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 controlling oil contamination recovery in a tube of an outdoor unit, after the step of "controlling the air conditioner to switch to the cooling 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 controlling the recovery of oil contamination in a pipe of the outdoor unit, the second recovery frequency is a maximum limit frequency corresponding to an outdoor environment temperature.
In a preferred embodiment of the method for controlling recovery of oil contamination inside a pipe of an outdoor 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 lowest rotating speed.
In a preferred embodiment of the method for controlling recovery of oil contamination in a pipe of an outdoor unit, before the step of "adjusting the opening degree of the throttle device", the method further includes:
and controlling the indoor fan to operate at a set rotating speed.
In a preferred embodiment of the method for controlling oil contamination recovery in a pipe of an outdoor unit, after the step of "controlling the air conditioner to switch to the cooling mode", the method further includes:
and controlling the indoor fan to stop running.
In a preferable embodiment of the method for controlling recovery of oil contamination in a pipe of the outdoor unit, the method further includes:
and when the outdoor unit pipe is in the oil stain recovery mode, the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed.
In a preferred embodiment of the method for controlling oil contamination recovery in a pipe of an outdoor unit, after the step of "controlling the on/off valve to be opened and the throttling device to be closed to a minimum opening", the method further includes:
and after the on-off valve is opened and the throttling device is closed to the minimum opening degree for a second preset time, the outdoor unit pipe is quitted from the oil stain recovery mode.
In a preferred embodiment of the method for controlling the recovery of oil contamination in a tube of an outdoor unit, the step of exiting the oil contamination recovery mode in the tube of the outdoor unit further includes:
controlling the air conditioner to recover to an operation mode before entering an oil stain recovery mode in the outdoor unit pipe;
controlling the frequency of the compressor before the compressor returns to the oil stain recovery mode in the outdoor unit pipe;
controlling the throttle device to recover to the opening before entering the oil stain recovery mode in the outdoor unit pipe;
and controlling the on-off valve to close.
In a preferred embodiment of the method for controlling the recovery of oil contamination in a tube of an outdoor unit, the step of exiting the oil contamination recovery mode in the tube of the outdoor unit further includes:
controlling the indoor fan to keep closed;
and when the temperature of the coil pipe of the indoor heat exchanger reaches the cold air prevention temperature, controlling the indoor fan to start and operate.
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 import 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 oil stain in the outdoor unit pipe, and entering an outdoor unit pipe oil stain recovery mode; controlling the air conditioner to operate in a heating 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 outdoor 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 refrigeration mode; controlling the on-off valve to be opened and the throttling device to be closed to the minimum opening degree; wherein the preset temperature is higher than the freezing temperature of the refrigerating machine oil.
By means of the control mode, oil stains in the pipe of the outdoor unit can be recovered, and the problem that the pipe of the outdoor heat exchanger is dirty and blocked is solved. Specifically, the air conditioner is controlled to firstly run a heating mode, the opening degree of the throttling device is adjusted to enable the temperature of the coil of the outdoor heat exchanger to be less than or equal to a preset temperature, the oil stain of the refrigerating machine oil is high in viscosity and higher in freezing point than that of a refrigerant, and the oil stain freezing point is higher than that of the oil stain of the refrigerating machine oil, 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 attached to the inner wall of the coil of the outdoor heat exchanger, and the normal refrigerating machine oil returns to the compressor along with the circulation of the refrigerant, and the oil stain in the refrigerant is separated and temporarily stored in the coil of the outdoor heat exchanger. When the temperature of the coil pipe is less than or equal to the preset temperature and lasts for a first preset time, the air-conditioning heat exchanger is controlled to be switched into a refrigeration mode, the on-off valve is opened, the throttling device is closed to the minimum opening degree, the quick flowing of a high-temperature and high-pressure refrigerant can be utilized to impact the interior of the coil pipe of the outdoor heat exchanger, oil dirt temporarily stored in the interior of the coil pipe is melted at high temperature and directly returns to the interior of the compressor along with the refrigerant, and the oil dirt recovery of the outdoor heat exchanger is realized. 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 controlling the recovery of oil contamination in a pipe of an outdoor unit according to the present invention will be described with reference to the accompanying drawings. In the drawings:
FIG. 1 is a system diagram of the air conditioner of the present application in a heating mode;
FIG. 2 is a system diagram of the air conditioner of the present application in a cooling mode;
fig. 3 is a flowchart of a method for controlling oil stain recovery in a pipe of an outdoor unit according to the present application;
fig. 4 is a logic diagram of a possible implementation process of the method for controlling oil stain recovery in a pipe of an outdoor unit according to the present application.
List of reference numerals
1. A compressor; 2. a four-way valve; 3. an outdoor heat exchanger; 4. a throttling device; 5. an indoor heat exchanger; 6. a refrigerant pipeline; 7. a recovery pipeline; 8. 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 protection of the present application. For example, although the following detailed description describes the detailed steps of the method of the present application, those skilled in the art can combine, split and exchange the order of the above steps without departing from the basic principle of the present application, and the modified technical solution does not change the basic concept of the present application and therefore falls into the protection scope of the present application.
It should be noted that the terms "first", "second" and "third" 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, in the description of the present application, unless explicitly stated or limited otherwise, the term "connected" is to be understood broadly, for example, it may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those skilled in the art as the case may be.
First, referring to fig. 1, the structure of the air conditioner of the present application will be described. Fig. 1 is a system diagram of the air conditioner of the present application in the heating mode.
As shown in fig. 1, in one possible embodiment, the air conditioner includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttle 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 E interface of cross valve 2 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 a port intercommunication of throttling arrangement 4, another port of throttling arrangement 4 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 the C 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, 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 throttling device 4 and the inlet of the outdoor heat exchanger 3, and the second end of the copper pipe is arranged on the refrigerant pipeline 6 between the S interface of the four-way valve 2 and the inlet of the liquid reservoir 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 realize the following method, a temperature sensor 10 is further disposed on the coil of the outdoor heat exchanger 3 of the present application, and the temperature sensor 10 is configured to detect the coil temperature of the outdoor heat exchanger 3. 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 in the outdoor unit of the present 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 constant, and those skilled in the art can adjust the method, for example, components may be added or deleted on the basis of the structure of the air conditioner.
The method for recovering oil contamination in a pipe of an outdoor unit according to the present invention will be described with reference to fig. 1, 2, and 3. Fig. 2 is a system diagram of the air conditioner of the present application in a cooling mode; fig. 3 is a flowchart of a method for recovering oil contamination in a pipe of an outdoor unit according to the present invention.
As shown in fig. 3, in order to solve the problem of how to recover oil contamination inside a pipe of an outdoor unit, the method for recovering oil contamination inside a pipe of an outdoor unit according to the present application includes:
s101, responding to a received instruction for recovering the oil stain in the pipe of the outdoor unit, and entering an outdoor unit pipe oil stain recovery mode.
In a possible implementation, the instruction of carrying out intraductal greasy dirt recovery to the off-premises station 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 not limited to a mobile phone, a tablet computer, an intelligent sound box, an intelligent watch and the like, and the mode of the intelligent device in communication connection with the air conditioner or the cloud comprises but not limited to wifi, bluetooth, infrared, 3G/4G/5G and the like. After receiving an instruction of recovering oil stain in the pipe from the outdoor unit, the air conditioner switches the operation mode to the oil stain recovery mode in the pipe of the outdoor unit, and starts to recover the oil stain in the pipe from the coil pipe of the outdoor unit. The oil stain recovery mode in the outdoor unit 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 each part of the air conditioner according to the steps set by the program.
Of course, the oil stain recycling instruction in the outdoor unit pipe may also be automatically sent out when the air conditioner reaches certain entering conditions, for example, the instruction for recycling the oil stain in the outdoor unit pipe is sent out when the accumulated working time of the air conditioner reaches a preset time, and the preset time may be, for example, 20h to 40h.
And S103, controlling the air conditioner to operate in a heating 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 heating mode, and when the four-way valve is powered on, the air conditioner operates in a cooling mode. In the embodiment, after entering the oil stain recovery mode in the outdoor unit pipe, if the air conditioner is in the heating mode, the air conditioner is controlled to continue to operate without adjustment; and if the air conditioner is operating in the non-heating mode, controlling the air conditioner to switch to the heating mode for operation.
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 a correspondence relationship between the outdoor environment 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≤-20 Outer loop temperature limit frequency maximum-5
-20<Tao≤-10 Outer ring temperature frequency limit maximum frequency-5
-10<Tao≤-5 Outer ring temperature frequency limit maximum frequency-5
-5<Tao≤0 Outer loop temperature frequency limiting maximum frequency
0<Tao≤5 Outer loop temperature frequency limiting maximum frequency
5<Tao≤10 Outer ring temperature frequency limiting maximum frequency +5
10<Tao≤16 Outer ring temperature frequency limiting maximum frequency +5
Tao>16 Outer ring temperature frequency limiting maximum frequency +5
It should be noted that, although specific numerical values are not listed in the present application to describe the first recovery frequency, this does not mean that the method of the present application cannot be implemented, and the first recovery frequency may be different under different types of air conditioners and different environmental conditions, so that a person skilled in the art may set the first recovery frequency based on a specific application scenario as long as the setting of the frequency is favorable for implementing a subsequent control process.
And S107, controlling the opening degree of the throttling device to enable the temperature of the coil of the outdoor heat exchanger to be less than or equal to a preset temperature.
In one possible implementation mode, the temperature of the coil of the outdoor heat exchanger is detected through a temperature sensor, and the opening degree of the electronic expansion valve is dynamically adjusted, so that the temperature of the coil of the outdoor heat exchanger is less than or equal to a 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 types of refrigerator oil, so the specific value of the preset temperature is determined based on the type 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 be-10 ℃ to-25 ℃, and the preset temperature can be-15 ℃ in the application. That is, the coil temperature of the outdoor heat exchanger is equal to or lower than the preset temperature as the control purpose, and the coil temperature of the outdoor 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 heating mode, the temperature of the coil of the outdoor heat exchanger is maintained at-15 ℃ or lower, and at this time, oil stains in the refrigerating machine oil flowing through the outdoor heat exchanger are separated from the refrigerant cycle and attached to the inner wall of the coil of the outdoor heat exchanger.
Of course, in other embodiments, the coil temperature of the outdoor 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 refrigeration 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, the first preset time period in this embodiment is 10min, and after the temperature of the coil pipe is less than or equal to-15 ℃ and lasts for 10min, the oil stains in the outdoor heat exchanger are already stripped, and then the stripped oil stains can be recycled. At this time, the switching between the operation modes of the air conditioner is controlled by controlling the on/off of the four-way valve, for example, the four-way valve is controlled to be powered off, and the air conditioner operates in a cooling mode.
And S111, controlling the on-off valve to be opened and the throttling device to be closed to the minimum opening degree.
In one possible embodiment, after the operation mode is switched to the cooling mode, the on-off valve is controlled to be opened, and the throttling device is closed to the minimum opening degree. The throttle device is controlled to be closed to the minimum opening, namely, the opening is 0, the throttle device realizes complete throttle, and the refrigerant can not flow through the throttle device. 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 outdoor heat exchanger, the high-temperature and high-pressure refrigerant quickly impacts the coil pipe of the outdoor heat exchanger, the oil stain temporarily stored in the coil pipe is 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 stain is achieved.
It can be seen that the heating mode is operated firstly by controlling the air conditioner, and the opening degree of the throttling device is adjusted to enable the temperature of the coil of the outdoor heat exchanger to be less than or equal to the preset temperature, because the viscosity of the refrigerating machine oil and the oil dirt is very large, the freezing point is higher than that of the refrigerant, and the freezing machine oil is higher than that of the oil dirt, the oil dirt in the refrigerating machine oil is firstly solidified and peeled 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 outdoor heat exchanger, and the normal refrigerating machine oil returns to the compressor along with the refrigerant circulation, so that the oil dirt in the refrigerant is separated and stored in the coil of the outdoor heat exchanger temporarily. After the coil pipe temperature is less than or equal to the preset temperature and lasts for the first preset duration, the air-conditioning heat exchanger is controlled to be converted into a refrigeration mode, the on-off valve is opened, the throttling device is closed, the quick flowing of the high-temperature and high-pressure refrigerant can be utilized to impact the interior of the coil pipe of the outdoor 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 liquid storage device along with the refrigerant through the recovery pipeline, and oil stain recovery of the outdoor heat exchanger is achieved.
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 outdoor 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 outdoor heat exchanger, need not to pass through indoor heat exchanger once more, but directly take the greasy dirt back to and retrieve the filtration in the reservoir, then again through compressor compression discharge circulation, the flow stroke that has reduced the high temperature refrigerant, 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 cooling 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 rise without limit, otherwise, the high-temperature protection shutdown phenomenon of the compressor is easy to occur, and the service life of the compressor is adversely affected. Therefore, the compressor all is provided with the protection mechanism, and under different outdoor environment temperature, the correspondence is provided with the maximum limit value frequency, and the second of this application is retrieved the frequency and is the maximum limit value frequency of compressor under current outdoor environment temperature, and under this frequency limit value, the compressor can improve the temperature and the pressure of refrigerant with the shortest time to improve greasy dirt recovery effect. 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 indoor fan to operate at a set rotating speed. Specifically, before the aperture of the throttling device is adjusted, the indoor fan is controlled to operate at a set rotating speed, so that the heat exchange effect between the refrigerant and the environment in the indoor heat exchanger can be improved, the temperature and the pressure of the refrigerant are reduced, the evaporation effect of the refrigerant in the outdoor heat exchanger is improved, and the outdoor coil is reduced to the preset temperature at a higher speed. The set rotating speed can be 600r/min-800r/min, the rotating speed is not suitable to be too high, and because the indoor unit is in a heating state, if the rotating speed is too high, sudden change of indoor environment temperature is easy to cause, and bad use experience is brought to users.
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 lowest rotating speed. Specifically, before the aperture of the throttling device is adjusted, the outdoor fan is controlled to operate at the lowest rotating speed, so that the heat exchange effect between the outdoor heat exchanger and air is reduced, the temperature reduction speed of the outdoor coil pipe can be increased, and the oil stain recovery efficiency is improved.
In one possible embodiment, the method further comprises: and after the air conditioner is controlled to be switched into the refrigeration mode, the indoor fan is controlled to operate for a third preset time and then stops operating. Specifically, the third preset time period may be any value from 10s to 1min, and may be 30s in the present application. When the indoor unit operates in the refrigeration mode, no refrigerant flows through the indoor heat exchanger, so that the outlet air temperature of the indoor unit is gradually reduced, and poor use experience can be brought to users. At this moment, the operation of the indoor fan is stopped after 30s, so that the influence on user experience caused by too low air outlet temperature can be avoided.
In one possible embodiment, the method further comprises: and when the outdoor unit enters an oil stain recovery mode in the pipe, the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed. Because the temperature of the coil of the outdoor heat exchanger needs to be reduced to a lower value, in order to achieve the condition as soon as possible, the compressor needs to operate at high frequency, and in the heating operation process, the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed, so that the smooth execution of the method is ensured. However, other protection functions 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 oil stain recovery mode in the outdoor unit pipe is not unique, and a person skilled in the art can adjust the control mode on the premise of ensuring that the heating mode is firstly operated to ensure that the temperature of the coil pipe is less than or equal to the preset temperature, then the operation is switched to the refrigeration mode, and the on-off valve is opened and the throttling device is closed. For example, one or more of the operating 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-described control manner may be omitted on the premise that the coil temperature of the outdoor heat exchanger can be maintained at or below the preset temperature.
In one possible embodiment, the method further comprises: and after the on-off valve is opened and the throttling device is closed to the minimum opening degree for a second preset time, the outdoor unit pipe is quitted from the oil stain recovery mode. 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 circulates for many times to generate a better oil stain recovery effect in the pipe, so that the oil stain recovery mode in the pipe of the outdoor unit is exited when the throttling device and the on-off valve are opened for 5min.
Specifically, the step of exiting the oil recovery mode in the outdoor unit pipe further comprises: the method comprises the steps of controlling the air conditioner to recover to an operation mode before entering an outdoor unit pipe oil stain recovery mode, controlling the frequency of the compressor before entering the outdoor unit pipe oil stain recovery mode, controlling an indoor fan to keep closed, controlling a throttling device to recover to an opening degree before entering the outdoor unit pipe oil stain recovery mode, and controlling an on-off valve 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 heating mode of the air conditioner before entering the oil stain recovery mode in the outdoor unit pipe as an example, after the oil stain recovery mode in the outdoor unit pipe is executed, the heating mode needs to be switched back to operate. At the moment, the four-way valve is controlled to be electrified to recover the heating mode, the compressor is controlled to recover the frequency before entering the oil stain recovery mode in the outdoor unit pipe from the second recovery frequency, the indoor fan is controlled to be kept closed, the electronic expansion valve is controlled to recover the opening degree before entering the oil stain recovery mode in the outdoor unit pipe, and the on-off valve is controlled to be closed, so that the refrigerant flows in the flow direction of the normal heating mode. Wherein, indoor fan keeps closing, prevents because when the air conditioner just changed into the mode of heating, indoor heat exchanger coil pipe temperature is crossed lowly and the air-out brings not good use experience for the user.
Correspondingly, after the indoor fan is controlled to be closed, the coil temperature of the indoor heat exchanger is acquired, and when the coil temperature of the indoor heat exchanger reaches the cold-proof air temperature, the indoor fan is controlled to be started and operated. When the temperature of the coil pipe of the indoor heat exchanger reaches the cold air prevention temperature, the indoor fan is started to operate at the moment, and the cold air cannot be blown outwards, so that the indoor fan can be controlled to start and operate, and the heating requirement of a user is met. And at this moment, the air conditioner completely recovers the heating parameters before the oil stain in the outdoor unit pipe is recovered and continues to operate.
Of course, the method for exiting the oil recovery mode in the outdoor unit pipe is not limited to the above-mentioned one, and a person skilled in the art can freely select a specific control method on the premise that the air conditioner can be restored to the operation state before entering the oil recovery mode in the outdoor unit pipe, and such a selection does not depart 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 oil stain recovery mode in the outdoor unit pipe; for another example, the indoor fan can be controlled to start and operate, the air guide plate is controlled to blow upwards, and the air guide plate is controlled to blow downwards after a certain time interval.
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 outdoor unit according to the present application.
As shown in fig. 4, in a possible implementation process, when the air conditioner operates in the heating mode, a user sends an instruction to the air conditioner to recover oil stain in the outdoor unit through a remote controller key:
firstly, step S201 is executed, the air conditioner enters an outdoor unit pipe oil stain recovery mode, namely the air conditioner is controlled to keep a heating mode to operate, the compressor is controlled to adjust to a first recovery frequency, the indoor fan is controlled to operate at a set rotating speed of 700r/min, and the outdoor fan is controlled to operate at the lowest rotating speed.
Next, step S203 is executed to adjust the opening degree of the throttling device and obtain the coil temperature Tc of the outdoor heat exchanger.
And step S205 is executed next, whether the coil temperature Tc of the outdoor heat exchanger is less than or equal to-15 ℃ and the duration t1 is more than or equal to 10min are simultaneously established or not is judged, and when the two conditions are simultaneously established, step S207 is executed, otherwise, when the two conditions are not simultaneously established, the step S203 is executed in a returning mode.
And S207, controlling an air conditioner to operate in a refrigeration mode, controlling a compressor to adjust to a maximum limit frequency corresponding to the outdoor environment temperature, controlling an indoor fan to operate for 30S and then to be closed, controlling an electromagnetic valve to be opened, and closing an electronic expansion valve to be at a minimum opening degree.
Step S209 is executed next, and whether the duration time t2 of the state that the electromagnetic valve is opened and the electronic expansion valve is closed to the minimum opening degree 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 heating mode, controlling the opening of the electronic expansion valve to recover to the opening before the oil stain recovery mode in the outdoor unit pipe, controlling the indoor fan to keep closed, controlling the frequency of the compressor to recover to the frequency before entering the oil stain recovery mode in the outdoor unit pipe, and controlling the electromagnetic valve to close.
Step S213 is executed next, and whether the coil temperature Tp of the indoor heat exchanger is equal to or higher than 40 ℃ is judged; when the judgment result is satisfied, executing step S215, otherwise, returning to continue executing step S213;
and S215, controlling the indoor fan to start and operate. And the air conditioner is recovered to the heating mode before entering the oil stain recovery mode in the outdoor unit pipe.
Those skilled in the art will appreciate that the above described air conditioner may also include other well known structures such as processors, controllers, memories, etc., wherein the memories include, but are not limited to, ram, flash, rom, prom, volatile, non-volatile, serial, parallel, or registers, etc., and the processors include, but are not limited to, CPLD/FPGA, DSP, ARM processor, 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 control method of an outdoor 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 inlet of the outdoor heat exchanger, the other end of the recovery pipeline is communicated with an air suction port of the compressor, an on-off valve is arranged on the recovery pipeline, the on-off valve is a normally-closed valve,
the control method comprises the following steps:
responding to a received instruction for recovering oil stain in the outdoor unit, and entering an outdoor unit oil stain recovery mode;
controlling the air conditioner to operate in a heating 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 outdoor 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 refrigeration mode;
controlling the on-off valve to be opened and the throttling device to be closed to the minimum opening degree;
wherein the preset temperature is greater than the freezing temperature of the refrigerating machine oil.
2. The method of claim 1, further comprising, after the step of controlling the air conditioner to be switched to the cooling mode, the step of:
and controlling the compressor to adjust to a preset second recovery frequency.
3. The method of claim 2, wherein the second recovery frequency is a maximum frequency corresponding to an outdoor ambient temperature.
4. The method of claim 1, further comprising, before the step of adjusting the opening degree of the throttling device, the step of:
and controlling the outdoor fan to operate at the lowest rotating speed.
5. The method of claim 1, further comprising, before the step of adjusting the opening degree of the throttling device, the step of:
and controlling the indoor fan to operate at a set rotating speed.
6. The method of claim 1, further comprising, after the step of controlling the air conditioner to be switched to the cooling mode, the step of:
and controlling the indoor fan to stop running.
7. The method of claim 1, further comprising:
and when the outdoor unit pipe is in the oil stain recovery mode, the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed.
8. The method of claim 6, further comprising, after the step of controlling the on/off valve to be opened and the throttling device to be closed to a minimum opening degree, the step of:
and after the on-off valve is opened and the throttling device is closed to the minimum opening degree for a second preset time, the outdoor unit pipe is quitted from the oil stain recovery mode.
9. The method of claim 8, wherein the step of exiting the outdoor unit indoor oil recovery mode further comprises:
controlling the air conditioner to recover to an operation mode before entering an oil stain recovery mode in the outdoor unit pipe;
controlling the frequency of the compressor before the compressor returns to the oil stain recovery mode in the outdoor unit pipe;
controlling the opening degree of the throttling device to be restored to the opening degree before the throttling device enters the oil stain recovery mode in the outdoor unit pipe;
and controlling the on-off valve to close.
10. The method of claim 9, wherein the step of exiting the outdoor unit indoor oil recovery mode further comprises:
controlling the indoor fan to keep closed;
and when the temperature of the coil pipe of the indoor heat exchanger reaches the cold air prevention temperature, controlling the indoor fan to start and operate.
CN202110777927.6A 2021-07-09 2021-07-09 Method for recovering and controlling oil stain in pipe of outdoor unit Active CN113483475B (en)

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