CN113483477B - Method for recycling and controlling oil stain in pipe of outdoor unit - Google Patents
Method for recycling and controlling oil stain in pipe of outdoor unit Download PDFInfo
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- CN113483477B CN113483477B CN202110802935.1A CN202110802935A CN113483477B CN 113483477 B CN113483477 B CN 113483477B CN 202110802935 A CN202110802935 A CN 202110802935A CN 113483477 B CN113483477 B CN 113483477B
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- 238000000034 method Methods 0.000 title claims abstract description 71
- 238000004064 recycling Methods 0.000 title abstract description 4
- 238000011084 recovery Methods 0.000 claims abstract description 135
- 230000001276 controlling effect Effects 0.000 claims abstract description 94
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 238000005057 refrigeration Methods 0.000 claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 239000003507 refrigerant Substances 0.000 claims description 68
- 238000001816 cooling Methods 0.000 claims description 9
- 238000007710 freezing Methods 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims description 6
- 238000011109 contamination Methods 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 90
- 230000008569 process Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 239000007788 liquid Substances 0.000 description 9
- 230000006870 function Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 239000010721 machine oil Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000030279 gene silencing Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 210000001835 viscera Anatomy 0.000 description 1
Classifications
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (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 application relates to the technical field of self-cleaning of air conditioners, in particular to a method for recycling and controlling oil stains in a pipe of an outdoor unit. The application aims to solve the problem of how to realize the recovery of oil stain in the pipe of the outdoor unit. For this purpose, the air conditioner of the present application includes a recovery line, a first on-off valve, and a second on-off valve. The method comprises the following steps: controlling the heating operation of the air conditioner and adjusting the compressor to a preset first recovery frequency; the opening degree of the throttling device is regulated to enable the temperature of a coil pipe of the outdoor heat exchanger to be smaller than or equal to a preset temperature; when the temperature of the coil is less than or equal to the preset temperature and lasts for a first preset time period, the air conditioner is controlled to be converted into refrigeration operation; controlling the throttling device to be closed to the minimum opening; and when the ratio of the discharge pressure to the suction pressure of the compressor is greater than a preset threshold value and lasts for a second preset time period, the first on-off valve is closed, and the second on-off valve and the throttling device are opened. The application can realize the recovery of the oil stain in the pipe of the outdoor unit.
Description
Technical Field
The application relates to the technical field of self-cleaning of air conditioners, in particular to a method for recycling and controlling oil stains in a pipe of an outdoor unit.
Background
For the outdoor unit of the air conditioner, the refrigerating machine oil can participate in circulation along with the refrigerant in the use process, in the circulation process, carbon formation and impurities can occur in the refrigerating machine oil, and the oil stains flow to the hairpin tube of the outdoor heat exchanger along with the refrigerant.
Accordingly, there is a need in the art for a new method of controlling the recovery of oil in a pipe of an outdoor unit to solve the above-mentioned problems.
Disclosure of Invention
In order to solve at least one of the above problems in the prior art, that is, in order to solve the problem of how to realize the recovery of oil stain in a pipe of an outdoor unit, the application provides a control method for recovering oil stain in a pipe of an outdoor unit, which is applied to an air conditioner, wherein the air conditioner comprises a compressor, a four-way valve, an indoor heat exchanger, a throttling device and an outdoor heat exchanger which are sequentially connected through refrigerant pipelines, the air conditioner further comprises a recovery pipeline, a first on-off valve and a second on-off valve, the first on-off valve is arranged on the refrigerant pipeline between the indoor heat exchanger and the throttling device, one end of the recovery pipeline is arranged on the refrigerant pipeline between the first on-off valve and the throttling device, the other end of the recovery pipeline is communicated with an air suction port of the compressor, the second on-off valve is arranged on the recovery pipeline,
The control method comprises the following steps:
responding to a received instruction for recovering the oil stain in the pipe of the outdoor unit, and entering an oil stain recovery mode in the pipe of the outdoor unit;
controlling the heating operation of the air conditioner;
controlling the compressor to adjust to a preset first recovery frequency;
the opening degree of the throttling device is regulated so that the temperature of the coil pipe of the outdoor heat exchanger is smaller than or equal to the preset temperature;
when the temperature of the coil is less than or equal to the preset temperature and lasts for a first preset time period, the air conditioner is controlled to be converted into refrigeration operation;
controlling the throttling device to be closed to the minimum opening;
obtaining the discharge pressure and the suction pressure of the compressor at intervals of a first interval;
and when the ratio of the exhaust pressure to the suction pressure is greater than or equal to a preset threshold value and lasts for a second preset duration, the first on-off valve is controlled to be closed, the second on-off valve is controlled to be opened, and the throttling device is controlled to be opened to a preset opening degree.
In the above preferred technical solution of the method for controlling recovery of oil stain in a pipe of an outdoor unit, the air conditioner further includes a third on-off valve, the third on-off valve is disposed on a refrigerant pipeline between the four-way valve and the indoor heat exchanger, and the step of controlling the air conditioner to switch to a refrigeration operation after the coil temperature is less than or equal to the preset temperature and the first preset duration further includes:
When the temperature of the coil is smaller than or equal to the preset temperature and lasts for the first preset time period, the first on-off valve and the third on-off valve are controlled to be closed;
controlling the compressor and the outdoor fan to stop;
and after the compressor and the outdoor fan are stopped and the first preset delay time is continued, controlling the air conditioner to be switched into refrigeration operation.
In a preferred technical solution of the method for controlling oil stain recovery in a pipe of an outdoor unit, before the step of controlling the throttle device to be closed to a minimum opening degree, the method further includes:
when the air conditioner is controlled to be switched into refrigeration operation, the first on-off valve, the second on-off valve and the third on-off valve are controlled to be opened;
controlling the compressor to adjust to a preset second recovery frequency;
the step of "controlling the throttle device to be closed to the minimum opening degree" further includes:
and after the compressor runs for a third preset time period at the second recovery frequency, controlling the throttling device to be closed to the minimum opening.
In the preferable technical scheme of the method for controlling the recovery of oil stain in the pipe of the outdoor unit, the second recovery frequency is the highest limit frequency corresponding to the outdoor environment temperature.
In a preferred technical solution of the method for controlling recovery of oil stain in a pipe of an outdoor unit, before the step of adjusting the opening degree of the throttling device, the method further includes:
the outdoor fan is controlled to stop running, and the indoor fan is controlled to run at a preset rotating speed;
after the step of "controlling the air conditioner to switch to the cooling operation", the control method further includes:
and controlling the indoor fan to stop running.
In a preferred technical solution of the above method for controlling recovery of oil stain in a pipe of an outdoor unit, the step of "adjusting the opening degree of the throttling device" further includes:
and adjusting the opening degree of the throttling device according to the preset exhaust temperature.
In the preferable technical scheme of the method for controlling oil stain recovery in the pipe of the outdoor unit, the control method further comprises the following steps:
when the oil stain recovery mode in the outdoor unit pipe is entered, the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed.
In the above preferred technical solution of the method for controlling recovery of oil stain in a pipe of an outdoor unit, after the step of controlling the first on-off valve to be closed, the second on-off valve to be opened, and the throttle device to be opened to a preset opening degree, the control method further includes:
And after the first on-off valve is closed, the second on-off valve is opened, and the throttling device is opened to a preset opening degree for a fourth preset duration, the oil stain recovery mode in the outdoor unit pipe is exited.
In the above preferred technical solution of the method for controlling oil stain recovery in a pipe of an outdoor unit, the step of "exiting the oil stain recovery mode in a pipe of the outdoor unit" further includes:
controlling the air conditioner to recover to an operation mode before entering the oil stain recovery mode in the outdoor unit pipe;
controlling the compressor to recover to a frequency before entering the oil stain recovery mode in the outdoor unit pipe;
after the throttle device is controlled to keep the preset opening and continuously for a fifth preset duration, controlling the throttle device to recover to the opening before entering the oil stain recovery mode in the outdoor unit pipe;
and controlling the first on-off valve to be opened and the second on-off valve to be closed.
In the above preferred technical solution of the method for controlling oil stain recovery in a pipe of an outdoor unit, the step of "exiting the oil stain recovery mode in a pipe of the outdoor unit" further includes:
when the temperature of the coil pipe of the indoor heat exchanger reaches the cold air prevention temperature, the indoor fan is controlled to start to operate.
In the preferred technical solution of the present application, the air conditioner includes a compressor, a four-way valve, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger sequentially connected by refrigerant pipelines, the air conditioner further includes a recovery pipeline, a first on-off valve, and a second on-off valve, the first on-off valve is disposed on the refrigerant pipeline between the indoor heat exchanger and the throttling device, one end of the recovery pipeline is disposed on the refrigerant pipeline between the first on-off valve and the throttling device, the other end of the recovery pipeline is communicated with an air suction port of the compressor, and the second on-off valve is disposed on the recovery pipeline, the control method includes: responding to a received command for recovering the oil stain in the pipe of the outdoor unit, and entering an oil stain recovery mode in the pipe of the outdoor unit; controlling the heating operation of the air conditioner; controlling the compressor to adjust to a preset first recovery frequency; the opening degree of the throttling device is regulated so that the temperature of a coil pipe of the outdoor heat exchanger is smaller than or equal to the preset temperature; when the temperature of the coil is less than or equal to the preset temperature and lasts for a first preset time period, the air conditioner is controlled to be converted into refrigeration operation; controlling the throttling device to be closed to the minimum opening; obtaining the discharge pressure and the suction pressure of the compressor at intervals of a first interval; and when the ratio of the exhaust pressure to the suction pressure is greater than or equal to a preset threshold value and lasts for a second preset duration, the first on-off valve is controlled to be closed, the second on-off valve is controlled to be opened, and the throttling device is controlled to be opened to a preset opening degree.
By the control mode, the method can realize the recovery of the oil stain in the pipe of the outdoor unit and solve the problem of pipe viscera blockage of the outdoor heat exchanger. Specifically, the air conditioner is controlled to perform heating operation firstly, the opening of the throttling device is regulated to enable the temperature of the coil pipe of the outdoor heat exchanger to be smaller than or equal to the preset temperature, and the viscosity of oil stains is large, the solidifying point is higher than that of the refrigerant, so that the oil stains are firstly solidified and separated out from the refrigerant circulation in the process of reducing the temperature of the refrigerant and are attached to the inner wall of the coil pipe of the outdoor heat exchanger, and the oil stains in the refrigerant are separated and temporarily stored in the coil pipe of the outdoor heat exchanger. When the temperature of the coil is less than or equal to the preset temperature and lasts for a first preset time period, the air conditioner heat exchanger is controlled to be switched into refrigeration operation, and the throttling device is controlled to be closed to the minimum opening degree, so that the refrigerant discharged by the compressor is heated, boosted and accumulated in the coil of the outdoor heat exchanger. When the ratio between the exhaust pressure and the suction pressure is larger than a preset threshold value, the first on-off valve is closed, the second on-off valve and the throttling device are opened, the coil pipe of the outdoor heat exchanger can be impacted by the rapid flow of the high-temperature and high-pressure refrigerant, and the greasy dirt temporarily stored in the coil pipe is melted at high temperature and directly returns to the inside of the compressor along with the refrigerant by the recovery pipeline, so that the greasy dirt recovery of the outdoor heat exchanger is realized. In addition, through setting up the recovery pipeline, can realize directly retrieving in the compressor with the greasy dirt belt back to the greasy dirt recovery in-process, reduce the flow stroke of high temperature refrigerant, reduce the pressure drop of refrigerant, improve the greasy dirt recovery effect, practice thrift the greasy dirt recovery time, guarantee user experience.
Drawings
The method for controlling the recovery of oil in a pipe of an outdoor unit according to the present application will be described with reference to the accompanying drawings. In the accompanying drawings:
fig. 1 is a system diagram of an air conditioner in a heating mode according to the present application;
FIG. 2 is a system diagram of an air conditioner in a cooling mode according to the present application;
FIG. 3 is a flow chart of the method for controlling the recovery of oil dirt in the pipe of the outdoor unit according to the present application;
fig. 4 is a logic diagram of a possible implementation procedure 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 throttle device; 5. an indoor heat exchanger; 6. a refrigerant pipe; 7. a recovery pipeline; 8. a first on-off valve; 9. a second on-off valve; 10. a third cut-off valve; 11. a reservoir.
Detailed Description
Preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present application, and are not intended to limit the scope of the present application. For example, although the following describes the steps of the method of the present application in detail, those skilled in the art can combine, split and exchange the above steps without departing from the basic principle of the present application, and the technical solution thus modified does not change the basic concept of the present application, and therefore falls within the scope of the present application.
It should be noted that in the description of the present application, the terms "first," second, "" third, "" fourth, "" fifth, "and sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It should also be noted that in the description of the present application, unless explicitly specified and limited otherwise, the term "connected" is to be construed broadly, and for example, may be a fixed connection, a removable connection, or a combination thereof; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.
First, referring to fig. 1, a structure of an air conditioner of the present application will be described. Fig. 1 is a system diagram of an air conditioner according to the present application in a heating mode.
As shown in fig. 1, in one possible embodiment, the air conditioner includes a compressor 1, a four-way valve 2, an indoor heat exchanger 5, a throttle device 4, an outdoor heat exchanger 3, and a reservoir 11. The exhaust port of the compressor 1 is communicated with the P interface of the four-way valve 2 through a refrigerant pipeline 6, the E interface of the four-way valve 2 is communicated with the inlet of the indoor heat exchanger 5 through the refrigerant pipeline 6, the outlet of the indoor heat exchanger 5 is communicated with one port of the throttling device 4 through the refrigerant pipeline 6, the other port of the throttling device 4 is communicated with the inlet of the outdoor heat exchanger 3 through the refrigerant pipeline 6, the outlet of the outdoor heat exchanger 3 is communicated with the C interface of the four-way valve 2 through the refrigerant pipeline 6, the S interface of the four-way valve 2 is communicated with the inlet of the liquid accumulator 11 through the refrigerant pipeline 6, and the outlet of the liquid accumulator 11 is communicated with the air suction port of the compressor 1 through a pipeline. The throttle device 4 is preferably an electronic expansion valve, a filter screen is arranged in the liquid reservoir 11, and the liquid reservoir 11 can play roles in storing refrigerant, separating refrigerant from gas and liquid, filtering greasy dirt, silencing, buffering refrigerant and the like.
The air conditioner further comprises a first on-off valve 8, a second on-off valve 9 and a recovery pipeline 7, wherein the first on-off valve 8 and the second on-off valve 9 are preferably electromagnetic valves, the first on-off valve 8 is a normally open valve and is arranged on a refrigerant pipeline 6 between the throttling device 4 and the indoor heat exchanger 5, the second on-off valve 9 is a normally closed valve and is arranged on the recovery pipeline 7, the recovery pipeline 7 adopts a copper pipe with a smooth inner wall, a first end of the copper pipe is arranged on the refrigerant pipeline 6 between the throttling device 4 and the first on-off valve 8, and a second end of the copper pipe is arranged on the refrigerant pipeline 6 between an S interface of the four-way valve 2 and an inlet of the liquid accumulator 11. The first on-off valve 8 and the second on-off valve 9 are both in communication connection with a controller of the air conditioner so as to receive opening and closing signals issued by the controller. Of course, one or more of the on-off valves can be replaced by an electronic expansion valve or other electronic control valve.
The following method for controlling oil stain recovery in the pipe of the outdoor unit of the present embodiment will be described in conjunction with the structure of the air conditioner, but it will be understood by those skilled in the art that the specific structural composition of the air conditioner is not constant, and those skilled in the art can adjust the same, for example, components may be added or deleted on the basis of the structure of the air conditioner.
The method for controlling the recovery of oil in a pipe of an outdoor unit according to the present application will be described with reference to fig. 1, 2 and 3. FIG. 2 is a system diagram of the air conditioner in a cooling mode according to the present application;
fig. 3 is a flowchart of the method for controlling the recovery of oil in a pipe of an outdoor unit according to the present application.
As shown in fig. 3, in order to solve the problem of how to implement oil stain recovery in a pipe of an outdoor unit, the method for controlling oil stain recovery in a pipe of an outdoor unit according to the present application includes:
s101, responding to a received command for recovering the oil stain in the pipe of the outdoor unit, and entering an oil stain recovery mode in the pipe of the outdoor unit.
In a possible implementation manner, the instruction for recovering the oil stain in the pipe of the outdoor unit can be actively sent by a user, for example, the instruction is sent to the air conditioner through a key on the remote controller, or the instruction is sent through a terminal in communication connection with the air conditioner, wherein the terminal can be an APP installed on the intelligent device, and the APP directly or through sending the instruction to the air conditioner to the cloud. The intelligent equipment comprises a mobile phone, a tablet personal computer, an intelligent sound box, an intelligent watch and the like, and the intelligent equipment is in communication connection with an air conditioner or a cloud terminal in a manner of wifi, bluetooth, infrared, 3G/4G/5G and the like. After receiving the instruction for recovering the oil stain in the pipe of 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 of the coil of the outdoor unit. The in-pipe oil stain recovery mode can be a computer program which is stored in the air conditioner in advance, and when the mode is operated, the air conditioner controls the operation of all parts of the air conditioner according to the steps set by the program.
Of course, the oil stain recovery instruction in the outdoor unit pipe can also be automatically sent when the air conditioner reaches certain entering conditions, for example, the instruction for recovering the oil stain in the outdoor unit pipe is sent when the accumulated working time of the air conditioner reaches the preset time, wherein the preset time can be 20-40 hours.
S103, controlling the heating operation of the air conditioner.
In a possible implementation manner, the switching between heating and cooling of the air conditioner is controlled by controlling the on-off of the four-way valve, for example, when the four-way valve is powered off, the air conditioner is in cooling operation, and when the four-way valve is powered on, the air conditioner is in heating operation. In this embodiment, after entering the oil stain recovery mode in the outdoor unit pipe, if the air conditioner is operating in the heating mode, no adjustment is needed, and the air conditioner is controlled to continue to operate; if the air conditioner is operating in the non-heating mode, the air conditioner is controlled to switch to the heating operation.
S105, controlling the compressor to adjust to a preset first recovery frequency.
In a possible embodiment, the first recovery frequency is a frequency determined in advance through experiments, and may be determined based on, for example, 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 the subsequent control process. The maximum value of the outer ring temperature frequency limit is the maximum limit frequency of the compressor corresponding to the outdoor environment temperature.
TABLE 1 comparison of outdoor ambient temperature with first recovery frequency and preset exhaust temperature
And S107, controlling the opening degree of the throttling device so that the coil temperature of the outdoor heat exchanger is smaller than or equal to the preset temperature.
In a possible implementation manner, the temperature of the coil pipe of the outdoor heat exchanger can be detected by a temperature sensor arranged on the coil pipe of the outdoor heat exchanger, and the opening degree of the electronic expansion valve is adjusted so that the temperature of the coil pipe of the outdoor heat exchanger is less than or equal to a preset temperature. Because the freezing point of the refrigerant is far lower than the freezing point of the greasy dirt, the greasy dirt can be solidified and separated out firstly when the temperature of the coil pipe is less than or equal to the preset temperature. The preset temperature of the present application may be set to-5 to-25 deg.c, and in the present application, the preset temperature may be-15 deg.c. That is, the coil temperature of the outdoor heat exchanger is set to be equal to or lower than the preset temperature for control purposes, and the coil temperature of the outdoor heat exchanger is always set to be equal to or lower than the preset temperature by adjusting the opening degree of the electronic expansion valve.
In one possible embodiment, the opening degree of the throttle device may be adjusted according to a preset exhaust gas temperature. Wherein the preset discharge temperature may be determined based on a correspondence relationship between the outdoor ambient temperature and the preset discharge temperature as in table 1 above. The target exhaust gas in the table is the target exhaust gas temperature of the compressor corresponding to the outdoor environment temperature, and the determination of the target exhaust gas temperature is a conventional means in the art and will not be described again. The applicant has found through experimentation that the outdoor coil temperature can be rapidly reduced below the preset temperature when the expansion valve is adjusted according to the preset discharge temperature described above.
Referring to fig. 1, during heating operation of the air conditioner, the coil temperature of the outdoor heat exchanger is maintained at-15 ℃ or lower, and oil stains in the outdoor heat exchanger are peeled off from the refrigerant circulation 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 equal to or lower than the preset temperature by adjusting the opening of the electronic expansion valve to a fixed opening.
And S109, controlling the air conditioner to switch into refrigeration operation after the temperature of the coil is less than or equal to the preset temperature and the first preset duration is prolonged.
In a possible implementation manner, the first preset duration may be any value in the range of 5-15 min. Preferably, in this embodiment, the first preset time period is 10min, and when the temperature of the coil is equal to or less than-15 ℃ and lasts for 10min, the oil stain in the outdoor heat exchanger is stripped, and at this time, the stripped oil stain can 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, controlling the four-way valve to be powered off and the air conditioner to operate in cooling.
S111, controlling the throttling device to be closed to the minimum opening.
In one possible embodiment, the throttle device is controlled to be closed to a state in which the minimum opening, i.e., the opening is 0, and the throttle device achieves complete throttle, and the refrigerant cannot flow. At this time, as shown in fig. 2, the refrigerant in the indoor heat exchanger and the refrigerant line is discharged by the compressor and accumulated in the outdoor heat exchanger.
S113, acquiring discharge pressure and suction pressure of the compressor at intervals of a first interval.
In one possible embodiment, the discharge pressure of the compressor may be obtained by providing a pressure sensor at the discharge port of the compressor, and the suction pressure may be obtained by providing a pressure sensor at the suction port of the compressor. The first interval may be any value from 1s to 10s, which is selected in relation to the exhaust pressure, the rate of change of the suction pressure and the control accuracy to be achieved by the present application. If the first recovery frequency is relatively large, the rate of change of the exhaust pressure and the suction pressure is relatively high, or the application requires a high control accuracy, the first interval time may be selected to be 1s, 2s or less, whereas if the first recovery frequency is relatively small, the rate of change of the exhaust pressure and the suction pressure is relatively low, or the control method of the application does not require a high accuracy, the first interval time may be selected to be 9s, 10s or more.
In the present application, the first interval time is preferably selected to be 5s, that is, after the first on-off valve is controlled to be closed, the discharge pressure and the suction pressure of the compressor are obtained every 5 s.
In other non-preferred embodiments, the exhaust pressure and the suction pressure may be obtained by a person skilled in the art without departing from the principles of the present application, for example, by providing a pressure sensor on the coil of the outdoor heat exchanger to obtain the exhaust pressure, providing a pressure sensor on the coil of the indoor heat exchanger to obtain the suction pressure, etc.
And S115, when the ratio of the exhaust pressure to the suction pressure is greater than or equal to a preset threshold value and lasts for a second preset duration, the first on-off valve is controlled to be closed, the second on-off valve is controlled to be opened, and the throttling device is controlled to be opened to a preset opening degree.
After the parameters are obtained, the ratio between the exhaust pressure and the suction pressure is calculated, and the ratio is compared with the magnitude of a preset threshold value and the duration of time when the ratio is smaller than the preset threshold value. In the present application, the preset threshold may be any value from 6 to 10, in the present application, 8, and the second preset duration may be any value from 3 to 10s, in the present application, 5s. When the ratio between the exhaust pressure and the suction pressure is greater than or equal to a preset threshold value and lasts for a second preset period of time, the refrigerant is accumulated in the outdoor heat exchanger, and the pressure of the exhaust port of the compressor is raised to a higher value at the moment, so that the oil stain recovery condition is met, and the oil stain recovery operation can be performed. When the conditions are met, the first on-off valve is controlled to be closed, the second on-off valve is controlled to be opened, and the throttling device is controlled to be opened to a preset opening degree. At this time, as shown by the arrow in fig. 2, the high-temperature and high-pressure refrigerant discharged by the compressor rapidly impacts the coil pipe of the outdoor heat exchanger, the greasy dirt temporarily stored in the coil pipe is melted, and flows back to the liquid reservoir along with the high-temperature refrigerant directly through the recovery pipeline, and is intercepted and filtered by the filter screen in the liquid reservoir, so as to achieve the aim of greasy dirt recovery. Preferably, the preset opening is the maximum opening of the throttling device, so that the high-temperature and high-pressure refrigerant can rapidly pass through, the pressure drop in the flowing process of the refrigerant is reduced, and the oil stain recovery effect in the pipe is improved.
It can be seen that by controlling the air conditioner to perform heating operation first and adjusting the opening of the throttling device, the temperature of the coil pipe of the outdoor heat exchanger is smaller than or equal to the preset temperature, and the viscosity of the greasy dirt is very high and the solidifying point is higher than that of the refrigerant, so that the greasy dirt is firstly solidified and separated out from the refrigerant circulation in the process of reducing the temperature of the refrigerant and is attached to the inner wall of the coil pipe of the outdoor heat exchanger, and the greasy dirt in the refrigerant is separated out and temporarily stored in the coil pipe of the outdoor heat exchanger. When the temperature of the coil is less than or equal to the preset temperature and lasts for a first preset time period, the air conditioner heat exchanger is controlled to be switched into refrigeration operation, and the throttling device is controlled to be closed to the minimum opening degree, so that the refrigerant discharged by the compressor is heated, boosted and accumulated in the coil of the outdoor heat exchanger. When the ratio between the exhaust pressure and the suction pressure is larger than a preset threshold value, the first on-off valve is closed, the second on-off valve and the throttling device are opened, the coil pipe of the outdoor heat exchanger can be impacted by the rapid flow of the high-temperature and high-pressure refrigerant, and the greasy dirt temporarily stored in the coil pipe is melted at high temperature and directly returns to the inside of the compressor along with the refrigerant by the recovery pipeline, so that the greasy dirt recovery of the outdoor heat exchanger is realized.
In addition, by arranging the recovery pipeline in the air conditioner, the application can realize the recovery of the oil stain by utilizing the recovery pipeline in the process of executing the recovery of the oil stain in the pipe of the outdoor heat exchanger, realize that the high-temperature and high-pressure refrigerant does not need to pass through the indoor heat exchanger again after flushing the outdoor heat exchanger, directly bring the oil stain back into the liquid reservoir for recovery and filtration, and then compress and discharge the oil stain again through the compressor for circulation, thereby reducing the flow stroke of the high-temperature refrigerant, reducing the along-path pressure drop and improving the recovery effect of the oil stain in the pipe.
Referring to fig. 1, in one possible embodiment, the air conditioner further includes a third on-off valve 10, the third on-off valve 10 is preferably a solenoid valve, the third on-off valve 10 is a normally open valve, which is disposed on the refrigerant line 6 between the four-way valve 2 and the indoor heat exchanger 5, and the third on-off valve 10 is communicatively connected with a controller of the air conditioner to receive an on-off signal issued by the controller. Obviously, the third on-off valve 10 can be replaced by an electronic control valve such as an electronic expansion valve.
On the basis of the third on-off valve, step S109 further includes: when the temperature of the coil is less than or equal to the preset temperature and lasts for a first preset time period, the first on-off valve and the third on-off valve are controlled to be closed; controlling the compressor and the outdoor fan to stop; after the compressor and the outdoor fan are stopped and the first preset delay time is continued, the air conditioner is controlled to be switched into refrigeration operation.
Specifically, the first preset delay time may be any value from 1min to 5min, and 3min is selected in the present application. When the temperature of the coil is less than or equal to the preset temperature and lasts for a first preset time period, the first on-off valve and the third on-off valve are controlled to be closed, and at the moment, part of refrigerant discharged by the compressor is accumulated in the outdoor heat exchanger, namely, between the first on-off valve and the third on-off valve. At this time, the compressor and the outdoor fan are controlled to stop, and the state is kept for 3min, and the coil of the outdoor heat exchanger can be fully cooled due to the fact that the temperature of the refrigerant is low at this time, and oil stains and the refrigerant are thoroughly separated. After lasting for 3min, the air conditioner is changed into refrigeration operation, and the oil stain recovery effect can be improved.
In a possible implementation manner, before step S111, the method further includes: when the air conditioner is controlled to be converted into refrigeration operation, the first on-off valve, the second on-off valve and the third on-off valve are controlled to be opened; controlling the compressor to adjust to a preset second recovery frequency; the step of "controlling the throttle device to be closed to the minimum opening degree" further includes: and after the compressor operates at the second recovery frequency for a third preset period of time, controlling the throttling device to be closed to the minimum opening.
Specifically, when the air conditioner is switched to the cooling operation, the first, second and third on-off valves are first controlled to be opened, and at this time, as shown in fig. 2, the refrigerant mainly circulates among the compressor, the outdoor heat exchanger and the recovery line. The second recovery frequency is preferably the highest limit frequency corresponding to the outdoor ambient temperature. In general, the operating frequency of the compressor is affected by the outdoor environment temperature, and cannot rise without limit, otherwise, the phenomenon of high-temperature protection shutdown of the compressor is easy to occur, and the service life of the compressor is adversely affected. Therefore, the compressor is provided with a protection mechanism, and the highest limit frequency is correspondingly arranged at different outdoor environment temperatures. The method for obtaining the outdoor environment temperature is a conventional method in the art, and is not described herein. The third preset time period can be any value of 10s-1min, 30s in the application, and after the compressor runs at the second recovery frequency for the third preset time period, the refrigerant circulates in the compressor, the outdoor heat exchanger and the recovery pipeline, is ready for oil stain recovery, and the throttle device is controlled to be closed to the minimum opening.
In one possible embodiment, before the step of "adjusting the opening degree of the throttle device", the method further includes: and controlling the outdoor fan to stop running, and controlling the indoor fan to run at a preset rotating speed. Specifically, before the opening degree of the throttling device is regulated, the outdoor fan is firstly controlled to stop running so as to reduce the heat exchange effect between the outdoor heat exchanger and the air, thereby being capable of accelerating the reduction speed of the temperature of the indoor coil pipe and improving the oil stain recovery efficiency. Before the opening degree of the throttling device is regulated, the indoor fan is controlled to run 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 too high, and because the indoor unit is in a heating state, if the rotating speed is too high, the mutation of the indoor environment temperature is easily caused, and bad use experience is brought to a user.
In one possible embodiment, the method further comprises: after the air conditioner is controlled to be converted into refrigeration operation, the indoor fan is controlled to operate for a sixth preset time period, and then the operation is stopped. Specifically, the sixth preset time period may be any value of 10s-1min, and may be 30s in the present application. When the refrigerating mode is operated, the air outlet temperature of the indoor unit is gradually reduced, and bad use experience can be brought to a user. At this time, the indoor fan is controlled to stop running after running for 30 seconds, so that the influence on user experience caused by too low air outlet temperature can be avoided.
In one possible embodiment, the method further comprises: when the oil stain recovery mode in the outdoor unit pipe is entered, the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed. Because the coil temperature of the outdoor heat exchanger needs to be reduced to a lower value, in order to reach the condition as soon as possible, the compressor needs to be operated 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 as to ensure the smooth execution of the method. However, other protection functions are normally started, such as compressor exhaust protection, current overload protection and the like, and the functions are kept on, so that adverse effects on the service life of the air conditioner are prevented.
Of course, the specific control process of the oil stain recovery mode in the outdoor unit pipe is not the only one, and on the premise of ensuring that the temperature of the coil pipe is smaller than or equal to the preset temperature in the heating operation, converting into the refrigeration operation, closing the throttling device to throttle, and controlling the first on-off valve to be closed, the second on-off valve to be opened and the throttling device to be opened through the pressure ratio of the exhaust pressure and the suction pressure, the control mode can be adjusted by a person skilled in the art. For example, on the premise that the coil temperature of the outdoor heat exchanger can be kept at a predetermined temperature or less, one or more of the operation frequency of the compressor, the opening degree of the electronic expansion valve, the opening and closing of the third cut-off valve, the rotation speed of the indoor fan, and the rotation speed of the outdoor fan in the control system described above may be omitted.
In one possible embodiment, the method further comprises: and after the first on-off valve is closed, the second on-off valve is opened, and the throttling device is opened to a preset opening degree for a fourth preset duration, the oil stain recovery mode in the outdoor unit pipe is exited. The fourth preset time period can be any value of 30s-120s, and the preset time period is preferably 60s. When the first on-off valve is closed, the second on-off valve is opened, and the throttling device is opened to the preset opening degree for 60 seconds, the high-temperature and high-pressure refrigerant is circulated for a plurality of times, so that a better oil stain recovery effect in the pipe is achieved, and when the first on-off valve is closed, the second on-off valve is opened, and the throttling device is opened to the preset opening degree for 60 seconds, the oil stain recovery mode in the pipe of the outdoor unit is exited.
Specifically, the step of exiting the oil stain recovery mode in the outdoor unit pipe further comprises: the method comprises the steps of controlling an air conditioner to recover to an operation mode before entering an oil stain recovery mode in an outdoor unit pipe, controlling a compressor to recover to a frequency before entering the oil stain recovery mode in the outdoor unit pipe, controlling a throttling device to keep a preset opening and continuously for a fifth preset duration, recovering to the opening before entering the oil stain recovery mode in the outdoor unit pipe, controlling an outdoor fan to be started, controlling an indoor fan to start to operate when the temperature of a coil pipe of an indoor heat exchanger reaches a cold air prevention temperature, and controlling a first on-off valve to be opened and a second on-off valve to be closed. After the oil stain recovery process in the pipe is finished, the air conditioner needs to be restored to an operation mode before oil stain recovery in the pipe so as to continuously adjust the indoor temperature. Taking the heating operation 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 operation needs to be switched back to the heating mode. At the moment, the four-way valve is controlled to be electrified to restore the heat mode, the compressor is controlled to restore the frequency before the oil stain recovery mode in the outdoor unit pipe from the second recovery frequency, the outdoor fan is controlled to be started, the indoor fan is controlled to be started when the coil temperature of the indoor heat exchanger reaches the cold air prevention temperature, the electronic expansion valve is controlled to keep the maximum opening degree, and the first on-off valve is controlled to be opened and the second on-off valve is controlled to be closed, so that the refrigerant flows in the flow direction of the normal heating mode.
When the temperature of the coil pipe of the indoor heat exchanger reaches the cold air prevention temperature, cold air cannot be blown outwards when the indoor fan is started to operate, so that the indoor fan can be controlled to start to operate, and the heating requirement of a user is met. The throttling device is opened to the maximum opening, so that the refrigerant is rapidly filled in the indoor heat exchanger, and the normal circulation of the refrigerant is realized as soon as possible.
Correspondingly, after the throttle device is controlled to keep the maximum opening and the fifth preset time period is continued, the throttle device is controlled to restore to the opening before entering the oil stain recovery mode in the outdoor unit pipe. The fifth preset time length can be any value within 1min-5min, the optimal time length is 3min, after the electronic expansion valve keeps the maximum opening degree to operate for 3min, the refrigerant circulation tends to be stable, and at the moment, the electronic expansion valve is controlled to restore to the opening degree before the oil stain in the outdoor unit pipe is restored to the oil stain recovery mode, so that the heating parameters of the air conditioner before the oil stain in the outdoor unit pipe is completely restored to continue to operate.
Of course, the mode of exiting the oil recovery mode in the outdoor unit pipe is not limited to the above, and a person skilled in the art may freely select a specific control mode without departing from the principles of the present application, on the premise that the air conditioner can be restored to the operation state before entering the oil recovery mode in the outdoor unit pipe. For example, the indoor fan can be controlled to start to operate and the air deflector is controlled to blow upwards, and after a certain time interval, the air deflector is controlled to blow downwards.
One possible implementation of the application is described below with reference to fig. 4. Fig. 4 is a logic diagram of a possible implementation procedure of the method for controlling oil stain recovery in a pipe of an outdoor unit according to the present application.
As shown in fig. 4, in one possible implementation process, when the air conditioner is in heating operation, a user sends an instruction for recovering oil stains in a pipe of the outdoor unit to the air conditioner through a remote controller button:
firstly, step S201 is executed, the air conditioner enters an oil stain recovery mode in an outdoor unit pipe, i.e. the air conditioner is controlled to keep a heating mode to operate, the compressor is controlled to adjust to a first recovery frequency, the outdoor fan is controlled to stop operating, and the indoor fan is controlled to operate at a preset rotating speed.
Next, step S203 is performed to determine a preset exhaust temperature according to the current outdoor ambient temperature, adjust the opening degree of the throttle device according to the preset exhaust temperature, and acquire the coil temperature Tp of the outdoor heat exchanger.
Step S205 is then executed to determine whether the coil temperature Tp 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, and when the coil temperature Tp and the duration t1 are simultaneously established, step S207 is executed, and otherwise, when the coil temperature Tp and the duration t1 are not simultaneously established, step S203 is executed.
S207, the first on-off valve and the third on-off valve are controlled to be closed, and the compressor and the outdoor fan are closed at the same time.
Step S209 is executed next, and whether the duration t2 of the closing of the compressor and the outdoor fan is more than or equal to 3min is established or not is judged, and when established, step S211 is executed; otherwise, when not established, the process returns to step S209.
S211, controlling the refrigerating operation of the air conditioner, controlling the starting of the compressor, adjusting the maximum limit frequency to the maximum limit frequency corresponding to the outdoor environment temperature, and controlling the first on-off valve, the second on-off valve and the third on-off valve to be opened simultaneously.
Step S213 is executed next to determine whether the duration t3 of the compressor running at the highest limit frequency is greater than or equal to 30S; if the determination result is true, step S215 is executed, otherwise, if the determination result is false, the routine returns to continue step S213.
S215, closing the throttling device and the indoor fan, detecting the exhaust pressure Pd and the suction pressure Ps every 5S, and calculating the ratio of the exhaust pressure Pd and the suction pressure Ps.
Next, step S217 is executed to determine whether the ratio Pd/Ps of the exhaust pressure Pd to the intake pressure Ps is equal to or greater than 8 and the duration t4 is equal to or greater than 5S is satisfied, and if so, step S219 is executed, and if not, step S217 is executed.
S219, the first on-off valve is closed, and the throttling device is opened to the maximum opening degree.
Next, step S221 is executed to determine whether the time period t5 when the first on/off valve is closed and the throttle device is opened to the maximum opening is equal to or greater than 60S, if yes, step S223 is executed, otherwise, step S221 is executed again if not.
S223, exiting the oil stain recovery mode in the outdoor unit pipe, specifically controlling the heating operation of the air conditioner, controlling the electronic expansion valve to keep the maximum opening, controlling the indoor fan to be started when the coil temperature of the indoor heat exchanger reaches the cold air prevention temperature, controlling the outdoor fan to be started, controlling the compressor to recover to the frequency before entering the oil stain recovery mode in the outdoor unit pipe, and controlling the first on-off valve to be opened and the second on-off valve to be closed.
Further, when the duration of keeping the maximum opening of the throttling device reaches 3min, the electronic expansion valve is controlled to recover to the opening before entering the oil stain recovery mode in the outdoor unit pipe, and the air conditioner is recovered to the heating mode before entering the oil stain recovery mode in the outdoor unit pipe.
It will be appreciated by those skilled in the art that the above-described air conditioner also includes some other well-known structure, such as a processor, a controller, a memory, etc., wherein the memory includes, but is not limited to, a random access memory, a flash memory, a read-only memory, a programmable read-only memory, a volatile memory, a non-volatile memory, a serial memory, a parallel memory, or a register, etc., and the processor includes, but is not limited to, a CPLD/FPGA, DSP, ARM processor, a MIPS processor, etc. These well-known structures are not shown in the drawings in order to not unnecessarily obscure the embodiments of the disclosure.
Although the steps are described in the above-described sequential order in the above-described embodiments, it will be appreciated by those skilled in the art that in order to achieve the effects of the present embodiments, the steps need not be performed in such order, and may be performed simultaneously (in parallel) or in reverse order, and such simple variations are within the scope of the present application.
Thus far, the technical solution of the present application has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present application is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present application, and such modifications and substitutions will fall within the scope of the present application.
Claims (10)
1. The method for controlling the recovery of the oil stain in the pipe of the outdoor unit is applied to an air conditioner and is characterized in that the air conditioner comprises a compressor, a four-way valve, an indoor heat exchanger, a throttling device and an outdoor heat exchanger which are sequentially connected through refrigerant pipelines, the air conditioner further comprises a recovery pipeline, a first on-off valve and a second on-off valve, the first on-off valve is arranged on the refrigerant pipeline between the indoor heat exchanger and the throttling device, one end of the recovery pipeline is arranged on the refrigerant pipeline between the first on-off valve and the throttling device, the other end of the recovery pipeline is communicated with an air suction port of the compressor, the second on-off valve is arranged on the recovery pipeline,
the control method comprises the following steps:
responding to a received instruction for recovering the oil stain in the pipe of the outdoor unit, and entering an oil stain recovery mode in the pipe of the outdoor unit;
controlling the heating operation of the air conditioner;
controlling the compressor to adjust to a preset first recovery frequency;
the opening degree of the throttling device is regulated so that the temperature of the coil pipe of the outdoor heat exchanger is smaller than or equal to the preset temperature;
when the temperature of the coil is less than or equal to the preset temperature and lasts for a first preset time period, the air conditioner is controlled to be converted into refrigeration operation;
Controlling the throttling device to be closed to the minimum opening;
obtaining the discharge pressure and the suction pressure of the compressor at intervals of a first interval;
and when the ratio of the exhaust pressure to the suction pressure is greater than or equal to a preset threshold value and lasts for a second preset duration, the first on-off valve is controlled to be closed, the second on-off valve is controlled to be opened, and the throttling device is controlled to be opened to a preset opening degree.
2. The method of claim 1, wherein the air conditioner further comprises a third on-off valve, the third on-off valve is disposed on a refrigerant pipeline between the four-way valve and the indoor heat exchanger, and the step of controlling the air conditioner to switch to a cooling operation when the coil temperature is less than or equal to the preset temperature for a first preset period of time further comprises:
when the temperature of the coil is smaller than or equal to the preset temperature and lasts for the first preset time period, the first on-off valve and the third on-off valve are controlled to be closed;
controlling the compressor and the outdoor fan to stop;
and after the compressor and the outdoor fan are stopped and the first preset delay time is continued, controlling the air conditioner to be switched into refrigeration operation.
3. The method of claim 2, wherein before the step of controlling the throttle device to be closed to the minimum opening degree, the method further comprises:
when the air conditioner is controlled to be switched into refrigeration operation, the first on-off valve, the second on-off valve and the third on-off valve are controlled to be opened;
controlling the compressor to adjust to a preset second recovery frequency;
the step of "the throttle device is closed to the minimum opening degree" further includes:
and after the compressor runs for a third preset time period at the second recovery frequency, controlling the throttling device to be closed to the minimum opening.
4. The method for controlling oil contamination recovery in a tube of an outdoor unit according to claim 3, wherein the second recovery frequency is a highest limit frequency corresponding to an outdoor ambient temperature.
5. The method of claim 1, wherein before the step of adjusting the opening degree of the throttle device, the method further comprises:
the outdoor fan is controlled to stop running, and the indoor fan is controlled to run at a preset rotating speed;
after the step of "controlling the air conditioner to switch to the cooling operation", the control method further includes:
And controlling the indoor fan to stop running.
6. The method of claim 1, wherein the step of adjusting the opening degree of the throttle device further comprises:
and adjusting the opening degree of the throttling device according to the preset exhaust temperature.
7. The method for controlling oil stain recovery in a pipe of an outdoor unit according to claim 1, further comprising:
when the oil stain recovery mode in the outdoor unit pipe is entered, the outdoor anti-freezing protection function and the outdoor environment temperature frequency limiting function are closed.
8. The method according to claim 5, wherein after the step of controlling the first on-off valve to be closed, the second on-off valve to be opened, and the throttle device to be opened to a preset opening degree, the method further comprises:
and after the first on-off valve is closed, the second on-off valve is opened, and the throttle device is opened to a preset opening degree for a fourth preset duration, the oil stain recovery mode in the outdoor unit pipe is exited.
9. The method of claim 8, wherein the step of exiting the outdoor unit in-pipe oil stain recovery mode further comprises:
Controlling the air conditioner to recover to an operation mode before entering the oil stain recovery mode in the outdoor unit pipe;
controlling the compressor to recover to a frequency before entering the oil stain recovery mode in the outdoor unit pipe;
after the throttle device is controlled to keep the preset opening and continuously for a fifth preset duration, controlling the throttle device to recover to the opening before entering the oil stain recovery mode in the outdoor unit pipe;
controlling the outdoor fan to start to operate;
and controlling the first on-off valve to be opened and the second on-off valve to be closed.
10. The method of claim 9, wherein the step of exiting the outdoor unit in-pipe oil stain recovery mode further comprises:
when the temperature of the coil pipe of the indoor heat exchanger reaches the cold air prevention temperature, the indoor fan is controlled to start to operate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110802935.1A CN113483477B (en) | 2021-07-15 | 2021-07-15 | Method for recycling and controlling oil stain in pipe of outdoor unit |
| PCT/CN2021/129795 WO2023284194A1 (en) | 2021-07-15 | 2021-11-10 | In-line oil contamination recovery control method for outdoor unit |
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| CN202110802935.1A CN113483477B (en) | 2021-07-15 | 2021-07-15 | Method for recycling and controlling oil stain in pipe of outdoor unit |
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| CN113483477B true CN113483477B (en) | 2023-09-19 |
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| CN113483475B (en) * | 2021-07-09 | 2022-10-28 | 青岛海尔空调器有限总公司 | Method for recovering and controlling oil stain in pipe of outdoor unit |
| CN113483477B (en) * | 2021-07-15 | 2023-09-19 | 青岛海尔空调器有限总公司 | Method for recycling and controlling oil stain in pipe of outdoor unit |
| CN114440392B (en) * | 2022-02-25 | 2023-10-27 | 海信空调有限公司 | Air conditioner and air conditioner control method |
| CN115930397B (en) * | 2022-11-21 | 2024-09-24 | 珠海格力电器股份有限公司 | Refrigerant recovery control method and device and air conditioner |
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