CN113566397B - Indoor unit in-pipe self-cleaning control method of air conditioning system - Google Patents

Indoor unit in-pipe self-cleaning control method of air conditioning system Download PDF

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Publication number
CN113566397B
CN113566397B CN202010291194.0A CN202010291194A CN113566397B CN 113566397 B CN113566397 B CN 113566397B CN 202010291194 A CN202010291194 A CN 202010291194A CN 113566397 B CN113566397 B CN 113566397B
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China
Prior art keywords
conditioning system
air conditioning
inlet
pipe
heat exchanger
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CN113566397A (en
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崔俊
徐佳佳
李延政
郑冬梅
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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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
    • F24F11/64—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
    • F24F11/50—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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • 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
    • 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
    • F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
    • F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
    • 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
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • 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
    • F25B43/003—Filters
    • 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
    • F25B43/006—Accumulators
    • 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
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/22—Cleaning ducts or apparatus
    • 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

Abstract

The invention relates to the technical field of air conditioners, in particular to a method for controlling self-cleaning in an indoor unit pipe of an air conditioning system. The invention aims to solve the problem that the heat exchange effect of an indoor heat exchanger is influenced because the refrigerator oil is easy to carbonize at high temperature. To this end, the method for controlling self-cleaning in the indoor unit pipe comprises the following steps: after the air conditioning system runs for a set time, acquiring the inlet pressure and the outlet pressure of the indoor heat exchanger; calculating an inlet-outlet pressure difference based on the inlet pressure and the outlet pressure of the indoor heat exchanger; comparing the inlet-outlet pressure difference with a pressure difference threshold value; and selectively controlling the air conditioning system to execute a self-cleaning mode in the indoor unit pipe based on the comparison result. Through the control mode, the indoor unit in-pipe self-cleaning control method can clear away impurities accumulated in the pipeline of the indoor heat exchanger, ensures that the pipe is clean and free of foreign matters, improves the whole heat exchange effect and efficiency of the air conditioning system, guarantees the service life sustainability of the air conditioning system, and improves user experience.

Description

Indoor unit in-pipe self-cleaning control method of air conditioning system
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method for controlling self-cleaning in an indoor unit pipe of an air conditioning system.
Background
The compressor is usually filled with refrigerating machine oil, and the refrigerating machine oil flows into a heat exchanger of an indoor unit along with a refrigerant in the operation process of the air conditioning system. High temperature carbonization of the refrigerating machine oil occurs due to the high temperature and wear of the compressor, and carbon substances are precipitated from the refrigerating machine oil mixture and become impurities. And current indoor heat exchanger's heat transfer copper pipe generally all is internal thread copper pipe, and intraductal sawtooth shape hinders the motion of impurity, and along with the time accumulation, impurity is intraductal long-pending more, hinders refrigerant and external heat transfer, leads to indoor heat exchanger's heat transfer area and difference in temperature to reduce, and heat exchange efficiency reduces, and direct influence user's use is experienced.
In view of the above problems, no practical and effective solution is available in the prior art.
Accordingly, there is a need in the art for a new method for controlling self-cleaning in an indoor unit tube of an air conditioning system to solve the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the heat exchange effect of an indoor heat exchanger is affected due to the fact that refrigerating machine oil is easily carbonized at high temperature, the invention provides a method for controlling self-cleaning in an indoor unit tube of an air conditioning system, wherein the air conditioning system comprises a compressor, an outdoor heat exchanger, an outdoor fan, a first throttling element, the indoor heat exchanger, the indoor fan and an oil controller, the compressor is provided with a liquid storage device, a filter screen is arranged in the liquid storage device, the oil controller comprises a shell, an inlet tube, an outlet tube and an oil return tube, the inlet tube, the outlet tube and the oil return tube are arranged in the shell, the oil return tube is communicated with an inlet of the liquid storage device, a second throttling element is arranged between the oil return tube and the inlet of the liquid storage device,
the indoor unit pipe self-cleaning control method comprises the following steps:
after the air conditioning system runs for a set time, acquiring the inlet pressure and the outlet pressure of the indoor heat exchanger;
calculating an inlet-outlet pressure difference based on the inlet pressure and the outlet pressure of the indoor heat exchanger;
comparing the inlet-outlet pressure difference with a pressure difference threshold value;
selectively controlling the air conditioning system to execute a self-cleaning mode in the indoor unit pipe based on the comparison result;
when the indoor unit operates in the self-cleaning mode, at least part of impurities in the indoor heat exchanger can flow into the liquid storage device together with refrigerant and refrigerating machine oil.
In a preferred embodiment of the above method for controlling self-cleaning in an indoor unit of an air conditioning system, "selectively controlling the air conditioning system to execute a self-cleaning mode in an indoor unit based on a comparison result" further includes:
and when the pressure difference between the inlet and the outlet is greater than or equal to the pressure difference threshold value, controlling the air conditioning system to execute a self-cleaning mode in the indoor unit.
In a preferred embodiment of the above method for controlling self-cleaning in an indoor unit of an air conditioning system, "selectively controlling the air conditioning system to execute a self-cleaning mode in an indoor unit based on a comparison result" further includes:
and when the inlet-outlet pressure difference is smaller than the pressure difference threshold value, controlling the air conditioning system to keep the current running state.
In the preferred technical solution of the above-mentioned method for controlling self-cleaning in an indoor unit tube of an air conditioning system, the step of controlling the air conditioning system to execute a self-cleaning mode in an indoor unit tube further includes:
acquiring a working mode of the air conditioning system;
when the air conditioning system operates in a refrigeration mode, controlling the air conditioning system to execute a first in-pipe self-cleaning step;
and when the air-conditioning system runs in a heating mode, controlling the air-conditioning system to execute a self-cleaning step in the second pipe.
In a preferred technical solution of the above method for controlling self-cleaning in an indoor unit of an air conditioning system, the step of self-cleaning in the first tube includes:
controlling the air conditioning system to adjust to the following states and continuously operating for a first set time period: the compressor is operated at a first set frequency, the outdoor fan is operated at a maximum wind speed, the indoor fan is operated at a minimum wind speed, the first throttling element is operated at a maximum opening degree, and the second throttling element is closed;
controlling the air conditioning system to adjust to the following states and continuously operating for a second set time length: the compressor stops operating, the outdoor fan stops operating, the indoor fan operates in a natural wind mode, the first throttling element is closed, and the second throttling element operates at a maximum opening degree.
In a preferred technical solution of the above method for controlling self-cleaning in an indoor unit of an air conditioning system, the step of self-cleaning in the second tube includes:
controlling the air conditioning system to adjust to the following states and continuously operating for a third set time length: the compressor is operated at a second set frequency, the outdoor fan is stopped, the indoor fan is operated at a medium air speed, the first throttling element is closed, and the second throttling element is operated at a maximum opening degree;
controlling the air conditioning system to adjust to the following states and continuously operating for a fourth set time length: the compressor stops operating, the outdoor fan and the indoor fan stop operating, the first throttling element is closed, and the second throttling element operates at a maximum opening degree.
In a preferred technical solution of the above method for controlling self-cleaning in an indoor unit of an air conditioning system, the method for controlling self-cleaning in an indoor unit further includes:
and after the execution of the self-cleaning mode in the indoor unit pipe is finished, controlling the air-conditioning system to recover to the state before the execution of the self-cleaning mode in the indoor unit pipe to continue running.
In the preferable technical scheme of the self-cleaning control method in the indoor unit pipe of the air conditioning system, the inlet-outlet pressure difference is calculated by adopting the following formula:
P＝ABS(P eva-in -P eva-out )
wherein P is the inlet-outlet pressure difference, P eva-in Is the inlet pressure of the indoor heat exchanger; the P is eva-out The ABS represents an absolute value for the outlet pressure of the indoor heat exchanger.
In a preferred technical scheme of the method for controlling self-cleaning in the indoor unit pipe of the air conditioning system, the inlet pipe is communicated with an outlet of the outdoor heat exchanger, the outlet pipe is communicated with an inlet of the indoor heat exchanger, and the first throttling element is arranged between the outlet pipe and the inlet of the indoor heat exchanger.
In a preferred technical solution of the above-mentioned method for controlling self-cleaning in an indoor unit of an air conditioning system, the first throttling element is an electronic expansion valve; and/or the second throttling element is an electronic expansion valve or an electromagnetic valve with controllable opening degree.
As can be understood by those skilled in the art, in a preferred technical solution of the present invention, an air conditioning system includes a compressor, an outdoor heat exchanger, an outdoor fan, a first throttling element, an indoor heat exchanger, an indoor fan, and an oil controller, the compressor is configured with a reservoir, a filter screen is disposed in the reservoir, the oil controller includes a casing, an inlet pipe, an outlet pipe, and an oil return pipe disposed in the casing, the oil return pipe is communicated with an inlet of the reservoir, a second throttling element is disposed between the oil return pipe and the inlet of the reservoir, and a self-cleaning control method in an indoor unit includes: after the air conditioning system runs for a set time, acquiring the inlet pressure and the outlet pressure of the indoor heat exchanger; calculating an inlet-outlet pressure difference based on the inlet pressure and the outlet pressure of the indoor heat exchanger; comparing the inlet-outlet pressure difference with a pressure difference threshold value; selectively controlling the air conditioning system to execute a self-cleaning mode in the indoor unit pipe based on the comparison result; when the indoor unit operates in the self-cleaning mode, at least part of impurities in the indoor heat exchanger can flow into the liquid storage device together with the refrigerant and the refrigerating machine oil.
Through the control mode, the indoor unit in-pipe self-cleaning control method can clear away impurities accumulated in an indoor heat exchanger pipeline, ensures that the pipe is clean and free of foreign matters, improves the overall heat exchange effect and efficiency of the indoor heat exchanger, guarantees the service life sustainability of the indoor heat exchanger, and improves user experience.
Specifically, the magnitude of the circulation resistance of the refrigerant in the pipeline of the indoor heat exchanger can be reflected by comparing the pressure difference between the inlet and the outlet of the indoor heat exchanger with the pressure difference threshold, when the pressure difference between the inlet and the outlet is greater than or equal to the pressure difference threshold, the pressure drop between the inlet and the outlet of the indoor heat exchanger is over large, namely the flow resistance of the refrigerant is over large, and as a result, the impurities in the pipeline are accumulated too much to block the circulation of the refrigerant, so that the inside of the pipeline of the indoor heat exchanger needs to be cleaned to remove the accumulation of the impurities. At this moment, carry out the intraductal automatically cleaning mode of indoor set through control air conditioning system, can make the interior impurity that gathers of indoor heat exchanger along with refrigerant and refrigerator oil together flow into the reservoir, filter impurity with the help of the inside filter screen that sets up of reservoir afterwards, make refrigerant and refrigerator oil after the filtration comparatively clean, it is less to contain the impurity content, finally realize the intraductal cleanness to indoor heat exchanger, improve indoor heat exchanger's heat transfer area and heat transfer effect, guarantee that air conditioning system is in higher work efficiency all the time, improve user experience.
Furthermore, the control method for executing the self-cleaning step in the first pipe or the self-cleaning step in the second pipe is selected based on the working mode of the air-conditioning system, so that different cleaning methods can be pertinently adopted based on different working modes, and the self-cleaning effect in the pipe under each working mode is improved on the premise of ensuring the user experience.
Drawings
The method for controlling self-cleaning in the indoor unit tube of the air conditioning system according to the present invention will be described with reference to the accompanying drawings. In the drawings:
FIG. 1 is a system diagram of an air conditioning system of the present invention;
FIG. 2 is a flow chart of a method for controlling self-cleaning in an indoor unit of an air conditioning system according to the present invention;
fig. 3 is a logic diagram of the method for controlling self-cleaning in the indoor unit of the air conditioning system according to the present invention.
List of reference numerals
1. A compressor; 2. a four-way valve; 3. an outdoor heat exchanger; 4. a first throttling element; 5. a bridge rectifier circuit; 6. an oil controller; 61. an inlet pipe; 62. an outlet pipe; 63. an oil return pipe; 7. an indoor heat exchanger; 8. a second throttling element; 9. a reservoir.
Detailed Description
Preferred embodiments of the present invention 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 principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the steps of the method of the present invention are described in detail below, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
First, referring to fig. 1, the structure of the air conditioning system of the present invention will be described.
As shown in fig. 1, fig. 1 is a system diagram of an air conditioning system, which includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a first throttling element 4, a bridge rectifier line 5, an oil controller 6, an indoor heat exchanger 7, a second throttling element 8, and an accumulator 9. The oil controller 6 comprises a shell, and an inlet pipe 61, an outlet pipe 62 and an oil return pipe 63 which are arranged on the shell, wherein the inlet pipe 61 extends into the shell from the top of the shell, the outlet pipe 62 and the oil return pipe 63 both extend into the shell from the bottom of the shell, and the extending height of the outlet pipe 62 is greater than that of the oil return pipe 63. The bridge type rectifying pipeline 5 is in a bridge type structure formed by four pipelines, and each pipeline is provided with a one-way valve (5 a-5 d). A filter screen is arranged in the liquid storage device 9, and the filter screen can filter other impurities on the basis that the refrigerant and the refrigerating machine oil can penetrate through. In this application, the first throttling element 4 is an electronic expansion valve, and the second throttling element 8 may be an electronic expansion valve or an electromagnetic valve with a controllable opening degree.
Referring to fig. 1, in the air conditioning system, in the cooling mode, an exhaust port of a compressor 1 is communicated with an inlet of an outdoor heat exchanger 3 through a four-way valve 2, an outlet of the outdoor heat exchanger 3 is communicated with an inlet pipe 61 of an oil controller 6 through a one-way valve 5a of a bridge rectifier pipeline 5, an outlet pipe 62 of the oil controller 6 is communicated with an inlet of a first throttling element 4, an outlet of the first throttling element 4 is communicated with an inlet of an indoor heat exchanger 7 through a one-way valve 5c, an outlet of the indoor heat exchanger 7 is communicated with an inlet of a reservoir 9 through the four-way valve 2, and an outlet of the reservoir 9 is communicated with an air suction port of the compressor 1. An oil return pipe 63 of the oil controller 6 is communicated with an inlet of the reservoir 9 through the second throttling element 8.
When the air conditioning system is in refrigeration operation, gaseous refrigerant mixed with refrigerating machine oil discharged by the compressor 1 enters the outdoor heat exchanger 3 through the four-way valve 2 and is liquefied into liquid refrigerant, and the liquid refrigerant enters the shell of the oil controller 6 through the one-way valve 5a and the inlet pipe 61. The liquid refrigerant entering the oil controller 6 has a trace amount of flash, most of the liquid refrigerant is still in a liquid state, the refrigerator oil in the oil controller 6 can be layered with the liquid refrigerant, the refrigerator oil is arranged at the lower layer, the middle layer is the liquid refrigerant, and the upper layer is the gaseous refrigerant. After being throttled by the outlet pipe 62 and the first throttling element 4, the gaseous refrigerant and the liquid refrigerant enter the indoor heat exchanger 7 through the one-way valve 5c and are vaporized into the gaseous refrigerant, and the gaseous refrigerant enters the suction port of the compressor 1 through the four-way valve 2 and the liquid reservoir 9, so that the circulation of the refrigerant is realized. The refrigerating machine oil at the lowest layer of the oil controller 6 enters the air suction port of the compressor 1 after passing through the second throttling element 8 and the reservoir 9, so that the circulation of the refrigerating machine oil is realized.
With continued reference to fig. 1, in the heating mode, the exhaust port of the compressor 1 is communicated with the inlet of the indoor heat exchanger 7 through the four-way valve 2, the outlet of the indoor heat exchanger 7 is communicated with the inlet pipe 61 of the oil controller 6 through the one-way valve 5b of the bridge rectifier pipeline 5, the outlet pipe 62 of the oil controller 6 is communicated with the inlet of the first throttling element 4, the outlet of the first throttling element 4 is communicated with the inlet of the outdoor heat exchanger 3 through the one-way valve 5d, the outlet of the outdoor heat exchanger 3 is communicated with the inlet of the reservoir 9 through the four-way valve 2, and the outlet of the reservoir 9 is communicated with the suction port of the compressor 1. An oil return pipe 63 of the oil controller 6 is communicated with an inlet of the reservoir 9 through the second throttling element 8.
When the air conditioning system is operated for heating, a gaseous refrigerant mixed with refrigerating machine oil and discharged from the compressor 1 enters the indoor heat exchanger 7 through the four-way valve 2 and is liquefied into a liquid refrigerant, and the liquid refrigerant enters the shell of the oil controller 6 through the one-way valve 5b and the inlet pipe 61. The liquid refrigerant entering the oil controller 6 has a trace amount of flash evaporation, most of the liquid refrigerant is still in a liquid state, the refrigerator oil in the oil controller 6 can be layered with the liquid refrigerant, the refrigerator oil is arranged at the lower layer, the middle layer is the liquid refrigerant, and the upper layer is the gaseous refrigerant. After being throttled by the outlet pipe 62 and the first throttling element 4, the gaseous refrigerant and the liquid refrigerant enter the outdoor heat exchanger 3 through the one-way valve 5d and are vaporized into the gaseous refrigerant, and the gaseous refrigerant enters the suction port of the compressor 1 through the four-way valve 2 and the liquid reservoir 9, so that the circulation of the refrigerant is realized. The refrigerating machine oil at the lowest layer of the oil controller 6 enters the air suction port of the compressor 1 after passing through the second throttling element 8 and the reservoir 9, so that the circulation of the refrigerating machine oil is realized.
It will be understood by those skilled in the art that although the air conditioning system of the present application is described in conjunction with the specific configuration, this is not intended to limit the scope of the present application, and those skilled in the art may add or delete one or more components or adjust the position of one or more components based on the configuration without departing from the principles of the present application. For example, the oil controller 6 may be replaced by another structure in the prior art, and the position of the oil controller may be between the rotary compressor 1 and the outdoor heat exchanger 3. For another example, the four-way valve 2 may not be provided in the air conditioning system, and accordingly, two lines need to be omitted from the bridge-type rectifying line 5.
Although the specific structure of the accumulator 9 is not discussed in the present application, this is not a lack of disclosure, and it can be understood by those skilled in the art that an accumulator of any structure may be applied to the present application as long as the conditions for filtering impurities and allowing filtered refrigerating machine oil and gaseous refrigerant to smoothly return to the compressor during the process of passing through the refrigerant and the refrigerating machine oil are satisfied.
The method for controlling self-cleaning in the indoor unit of the air conditioning system according to the present invention will be described with reference to fig. 2 and 3. Fig. 2 is a flowchart of a method for controlling self-cleaning in an indoor unit of an air conditioning system according to the present invention; fig. 3 is a logic diagram of the method for controlling self-cleaning in the indoor unit of the air conditioning system according to the present invention.
As described in the background art, in the prior art, the refrigerator oil is easily carbonized at high temperature under the influence of high temperature and abrasion of the compressor, and carbon substances are precipitated from the mixture of the refrigerator oil and become impurities to circulate in the system along with the refrigerant. And indoor heat exchanger is owing to be mostly internal thread copper pipe, and its inner structure hinders the operation of impurity easily and leads to impurity to gather, and long-term, impurity is in heat exchanger intraductal long-pending more, hinders refrigerant and external heat transfer, leads to indoor heat exchanger's heat transfer effect to descend, heat exchange efficiency reduces, influences user experience. In order to solve the problems, the method for controlling the self-cleaning in the indoor unit pipe of the air conditioning system mainly comprises the following steps:
s100, acquiring inlet pressure and outlet pressure of an indoor heat exchanger after the air conditioning system runs for a set time; for example, after the air conditioning system is started for 3min, the system operates stably, and at the moment, the inlet pressure and the outlet pressure of the indoor heat exchanger are respectively obtained through the pressure sensors arranged on the inlet pipeline and the outlet pipeline of the indoor heat exchanger. Certainly, the specific value of the set time and the pressure acquisition mode are not unique, and can be adjusted by a person skilled in the art, the set time is set to acquire pressure data after the air conditioning system runs stably, so that the accuracy of data acquisition is ensured, and the pressure can be determined by acquiring the temperature through the temperature-pressure corresponding relation after the temperature sensor acquires the temperature.
S200, calculating the pressure difference between an inlet and an outlet based on the inlet pressure and the outlet pressure of the indoor heat exchanger; for example, the inlet-outlet pressure difference may be calculated by calculating the absolute value of the difference between the inlet pressure and the outlet pressure (e.g., using an ABS function). Of course, the inlet-outlet pressure difference can also be obtained by subtracting a smaller value from a larger value of the inlet pressure and the outlet pressure.
S300, comparing the pressure difference between an inlet and an outlet with a pressure difference threshold value; for example, after the inlet/outlet pressure difference is calculated, the inlet/outlet pressure difference and the pressure difference threshold may be compared by comparing the difference or ratio between the inlet/outlet pressure difference and the pressure difference threshold.
S400, selectively controlling the air conditioning system to execute a self-cleaning mode in the indoor unit pipe based on the comparison result; for example, when the comparison result shows that the pressure difference between the inlet and the outlet is greater than or equal to the pressure difference threshold value, the air conditioning system is controlled to execute a self-cleaning mode in the indoor unit pipe.
Wherein, it should be noted that, when indoor set intraductal self-cleaning mode operation in this application, can take away and flow into the reservoir with refrigerant and refrigerator oil together through refrigerant and refrigerator oil's the at least some impurity in the pipeline of indoor heat exchanger with the scouring action.
According to the indoor unit pipe self-cleaning control method, impurities accumulated in the system pipeline, especially the indoor heat exchanger pipeline can be removed through the indoor unit pipe self-cleaning mode in operation, the pipe is clean and free of foreign matters, the overall heat exchange effect and efficiency of the indoor heat exchanger are improved, the service life sustainability of the indoor heat exchanger is guaranteed, and user experience is improved.
Specifically, the magnitude of the circulation resistance of the refrigerant in the pipeline can be reflected by comparing the pressure difference between the inlet and the outlet of the indoor heat exchanger with the pressure difference threshold, when the pressure difference between the inlet and the outlet is greater than or equal to the pressure difference threshold, the pressure drop between the inlet and the outlet of the indoor heat exchanger is over large, namely the flowing resistance of the refrigerant is over large, and as a result, the inside of the pipeline of the indoor heat exchanger needs to be cleaned to remove accumulated impurities due to the fact that the impurities in the pipeline are accumulated too much to block the circulation of the refrigerant. At this moment, carry out the intraductal automatically cleaning mode of indoor set through control air conditioning system, can make refrigerant and refrigerator oil flow at a high speed and erode the effect under, take away the impurity that gathers in the indoor heat exchanger and along with refrigerant and refrigerator oil together flow into the reservoir, filter impurity with the help of the inside filter screen that sets up of reservoir afterwards, make refrigerant and refrigerator oil after the filtration comparatively clean, it is less to contain the impurity content, thereby it is intraductal clean to realize indoor heat exchanger, improve indoor heat exchanger's heat transfer area and heat transfer effect, guarantee that indoor heat exchanger is in higher work efficiency all the time.
The following discusses the method for controlling self-cleaning in the indoor unit of the air conditioning system in detail.
In a preferred embodiment, step S400 further includes: when the pressure difference between the inlet and the outlet is greater than or equal to the pressure difference threshold value, controlling the air-conditioning system to execute a self-cleaning mode in the indoor unit pipe; and when the pressure difference between the inlet and the outlet is smaller than the pressure difference threshold value, controlling the air conditioning system to keep the current running state.
Specifically, when the pressure difference between the inlet and the outlet is greater than or equal to the pressure difference threshold, it indicates that the pressure drop between the inlet and the outlet of the indoor heat exchanger is too large, in other words, the circulation resistance of the refrigerant in the indoor heat exchanger is too large, and as a result, the impurities in the pipeline of the indoor heat exchanger are accumulated too much to obstruct the circulation of the refrigerant, and therefore, the interior of the pipeline of the indoor heat exchanger needs to be cleaned to remove the accumulated impurities. When the pressure difference between the inlet and the outlet is smaller than the pressure difference threshold value, the pressure drop between the inlet and the outlet of the indoor heat exchanger is small, the circulation of the refrigerant is normal, and therefore the indoor heat exchanger does not need to be cleaned, and the current operation state of the air conditioning system is kept.
In another preferred embodiment, since the operation mode of the air conditioning system determines the flow direction of the refrigerant in the system, and the flow direction of the refrigerant has a decisive influence on the cleaning manner, before the indoor heat exchanger is cleaned, the current operation mode of the air conditioning system is determined, and the specific cleaning step of the self-cleaning mode in the indoor unit pipe is specifically determined based on the operation mode. That is, the step of controlling the air conditioning system to perform the indoor unit self-cleaning mode further includes: acquiring a working mode of an air conditioning system; when the air conditioning system runs in a refrigeration mode, controlling the air conditioning system to execute a self-cleaning step in the first pipe; and when the air-conditioning system operates in a heating mode, controlling the air-conditioning system to execute a self-cleaning step in the second pipe.
Before describing the self-cleaning step in the first pipe and the self-cleaning step in the second pipe, it should be noted that the indoor fan of the existing air conditioning system generally includes a plurality of wind speeds, and for the following description to be clear, the wind speed of the indoor fan is divided from low to high according to the rotating speed as follows: the minimum wind speed is less than the low wind speed, the medium wind speed is less than the high wind speed and the maximum wind speed. Wherein, the minimum wind speed and the maximum wind speed respectively correspond to the minimum rotating speed and the maximum rotating speed of the indoor fan (the outdoor fan is the same as the above). In addition, the fan in the present embodiment also has a natural wind mode, in which the wind speed and the wind volume of the fan are random and non-repetitive, but are closest to the nature. Of course, the above-mentioned division is intended to more clearly describe the technical solution of the present application, and is not intended to limit the protection scope of the present application. Without departing from the principles of the present application, one skilled in the art may employ other partitioning methods to repartition the wind speed of the indoor fan.
Two self-cleaning steps are described in detail below. When the air conditioning system operates in the cooling mode, the step of controlling the air conditioning system to perform self-cleaning in the first tube further comprises: controlling the air conditioning system to adjust to the following states and continuously operating for a first set time period: the compressor runs at a first set frequency, the outdoor fan runs at the maximum wind speed, the indoor fan runs at the minimum wind speed, the first throttling element runs at the maximum opening degree, and the second throttling element is closed; and then controlling the air conditioning system to adjust to the following states and continuously operating for a second set time length: the compressor stops operating, the outdoor fan stops operating, the indoor fan operates in a natural wind mode, the first throttling element is closed, and the second throttling element operates at the maximum opening degree.
For example, when the air conditioning system operates in the cooling mode, the refrigerant flows in the direction of the compressor → the outdoor heat exchanger → the oil controller → the first throttling element → the indoor heat exchanger → the accumulator → the compressor. Because the refrigerant flows through the outdoor heat exchanger firstly and then flows through the indoor heat exchanger, the indoor heat exchanger can be cleaned by means of a normal refrigerant circulation loop. At this time, the compressor is first controlled to operate at a first set frequency, and the first set frequency can be selected to be a higher frequency, so that the system has a higher pressure, so as to increase the flow speed of the refrigerant. The specific value of the first set frequency can be obtained through experiments, and is not limited in this embodiment. Under the high-frequency drive of the compressor, the gaseous refrigerant enters the outdoor heat exchanger through the four-way valve, at the moment, the outdoor fan operates at the maximum wind speed, the heat exchange between the gaseous refrigerant entering the outdoor heat exchanger and air is violent and is rapidly condensed into a liquid refrigerant, and the liquid refrigerant rapidly flows into the oil controller. At the moment, the first throttling element operates at the maximum opening degree, the second throttling element is closed, so that the boiling point of liquid refrigerant entering the indoor heat exchanger is not greatly reduced, the evaporation process of the refrigerant in the indoor heat exchanger is not violent, in addition, the indoor unit operates at the minimum wind speed, the heat exchange between the refrigerant and indoor air is not violent, part of the refrigerant still flows through the indoor heat exchanger in a liquid state, a heat exchange copper pipe is flushed in the flowing process, impurities in the heat exchange copper pipe are taken away and flow back to the liquid storage device through the four-way valve, and the refrigerant mixed with refrigerating machine oil and impurities enters the compressor again to participate in circulation after filtering the impurities by the aid of a filter screen in the liquid storage device. When the operation state lasts for a first set time, all refrigerants circulate in the air conditioning system for one or more times, at the moment, the compressor is controlled to stop operating, the outdoor fan is controlled to stop operating, the first throttling element is kept closed, the second throttling element operates at the maximum opening degree, the refrigerants, the refrigerating machine oil and a small amount of impurities in the oil controller flow back into the liquid storage device through the oil return pipe and the second throttling element under the action of pressure, and the impurities are filtered by means of the filter screen in the liquid storage device. After the second set time, the liquid refrigerant, the refrigerating machine oil and the impurities in the oil controller basically flow back and are finished, the refrigerant and the refrigerating machine oil in the system are cleaner, and the self-cleaning in the pipe of the indoor unit under the refrigerating condition is realized. In the process of operation of the self-cleaning step in the first pipe, in order to ensure the cleaning effect and simultaneously not greatly sacrifice the experience of indoor users, when the compressor operates at a first set frequency, the indoor fan is controlled to operate at the minimum wind speed, and when the compressor stops operating, the indoor fan is controlled to keep operating in a natural wind mode.
When the air-conditioning system operates in the heating mode, the step of controlling the air-conditioning system to execute self-cleaning in the second pipe further comprises the following steps: controlling the air conditioning system to adjust to the following states and continuously operating for a third set time length: the compressor runs at a second set frequency, the outdoor fan stops running, the indoor fan runs at a medium wind speed, the first throttling element is closed, and the second throttling element runs at the maximum opening degree; and then controlling the air conditioning system to adjust to the following states and continuously operating for a fourth set time period: the compressor stops operating, the outdoor fan and the indoor fan stop operating, the first throttling element is closed, and the second throttling element operates at the maximum opening degree.
For example, when the air conditioning system operates in the heating mode, the refrigerant flows in the direction of the compressor → the indoor heat exchanger → the oil controller → the first throttling element → the outdoor heat exchanger → the accumulator → the compressor, and the refrigerating machine oil flows in the direction of the compressor → the indoor heat exchanger → the oil controller → the second throttling element → the accumulator → the compressor. Because the refrigerant flows through the indoor heat exchanger firstly, the indoor heat exchanger can be cleaned skillfully by the circulation formed by the compressor → the indoor heat exchanger → the oil controller → the liquid reservoir → the compressor. At this time, the compressor is first controlled to operate at a second set frequency, and the second set frequency may be a higher frequency, so that the system has a higher pressure, so as to increase the flow speed of the refrigerant. The specific value of the second set frequency can be obtained through experiments, and is not limited in this embodiment. Under the high frequency drive of compressor, gaseous refrigerant gets into indoor heat exchanger through the cross valve, and indoor fan moves with medium wind speed this moment, and this wind speed can balance refrigerant condensation effect and indoor heat transfer effect. The gaseous refrigerant entering the indoor heat exchanger exchanges heat with air and is rapidly condensed into liquid refrigerant, and the liquid refrigerant rapidly flows under high pressure to scour the heat exchange copper pipe, takes away impurities in the heat exchange copper pipe and enters the oil controller through the inlet pipe of the oil controller. At the moment, the first throttling element is closed, and the second throttling element operates at the maximum opening degree, so that liquid refrigerant, refrigerating machine oil and impurities flow back into the liquid storage device through the oil return pipe and the second throttling element under the internal pressure of the oil controller, and the impurities are filtered by the aid of the filter screen inside the liquid storage device. When the operation state lasts for a third set time, all refrigerants circulate for one or more times in the small circulation, at the moment, the compressor is controlled to stop operating, the outdoor fan is controlled to stop operating, the indoor fan is controlled to stop operating, the first throttling element is controlled to be closed, the second throttling element operates at the maximum opening, the refrigerants, the refrigerating machine oil and impurities in the oil controller flow back into the liquid storage device through the oil return pipe and the second throttling element under the action of pressure, and the impurities are filtered by means of the filter screen in the liquid storage device. After the fourth set time, the liquid refrigerant, the refrigerating machine oil and the impurities in the oil control device basically flow back, at the moment, the refrigerant and the refrigerating machine oil in the liquid storage device are relatively clean, and the in-pipe self-cleaning of the indoor unit under the heating condition is realized. In the process of operation of the self-cleaning step in the second pipe, in order to balance the cleaning effect and the experience of indoor users, when the compressor operates at the second set frequency, the indoor fan is controlled to operate at the medium air speed, and when the compressor stops, the indoor fan is controlled to stop operating so as to prevent the air conditioner from blowing cold air.
It can be seen from the above description that, this application can realize the intraductal automatically cleaning of indoor heat exchanger under balanced clean effect and indoor user experience prerequisite through controlling compressor, indoor fan, outdoor fan, first throttling element and second throttling element respectively under refrigeration and heating mode with different operating condition operation, guarantees heat transfer area and the heat transfer effect of indoor heat exchanger after the cleanness to make indoor heat exchanger be in higher work efficiency all the time, promote user experience.
In another preferred embodiment, the method for controlling self-cleaning in an indoor unit tube further includes: and after the self-cleaning mode in the indoor unit pipe is executed, controlling the air conditioning system to recover to the state before the self-cleaning mode in the indoor unit pipe is executed to continue running. Specifically, after the indoor unit pipe is operated in the self-cleaning mode, impurities in the indoor heat exchanger are removed, and the air conditioner can be controlled to return to the operation state before the indoor unit pipe in the self-cleaning mode, so that the use experience of a user is guaranteed.
In another preferred embodiment, the inlet-outlet pressure difference can be calculated by the following formula:
P＝ABS(P eva-in -P eva-out ) (1)
in the formula (1), P is the pressure difference between the inlet and the outlet, P eva-in The inlet pressure of the indoor heat exchanger; p eva-out Is the outlet pressure of the indoor heat exchanger.
It should be noted that, although specific values are not given in the above description, the pressure difference threshold, the first to fourth setting time periods, the first/second setting frequency, etc., are not insufficient in the disclosure of the present application, and on the contrary, a person skilled in the art may perform experimental setting or empirical setting on the above parameters based on a specific application scenario of the air conditioning system, so that the present control method can better exert its efficacy.
One possible implementation of the control method of the present invention is described below with reference to fig. 3. Fig. 3 is a logic diagram of a method for controlling self-cleaning in an indoor unit of an air conditioning system according to the present invention.
As shown in fig. 3, in a possible embodiment, after the air conditioner is started, step S10 is first executed: after acquiring the operation time t → acquiring the operation time t, step S20 is executed: comparing the running time t with 3min → if t is more than or equal to 3min, step S30 is executed: obtaining inlet pressure P of indoor heat exchanger eva-in And an outlet pressure P eva-out → after acquiring the above parameters, step S40 is executed: calculating the pressure difference P → calculating the temperature difference after using the formula (1), then executing step S50: comparing the magnitude of the inlet-outlet pressure difference P with the pressure difference threshold value delta P → when P ≧ delta P holds, executing step S60: judging whether the operation mode of the air conditioner is the cooling mode → if so, executing the step S61: performing a first in-tube self-cleaning step → otherwise, performing step S70: judging whether the air conditioning system is in the heating mode → if so, executing step S71: executing a second in-pipe self-cleaning step → when the comparison result in the step S50 is that P ≧ Δ P is false, or the judgment result in the step S70 is no, ending the program and keeping the current operating state of the air-conditioning system unchanged.
It should be noted that the controller for executing the control method may be a controller dedicated to execute the method of the present invention, a controller of an existing air conditioning system, or a functional module or functional unit of a general controller.
It will be understood by those skilled in the art that although the specific structure of the controller is not illustrated in the above embodiments, the controller of the air conditioning system may also include other known structures, such as a processor, a memory, etc., wherein the memory includes, but is not limited to, a random access memory, a flash memory, a read only memory, a programmable read only memory, a volatile memory, a non-volatile memory, a serial memory, a parallel memory or a register, etc., and the processor includes, but is not limited to, a CPLD/FPGA, a DSP, an ARM processor, a MIPS processor, etc. Such well-known structures are not shown in the drawings in order to not unnecessarily obscure embodiments of the present disclosure.
In addition, 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 embodiment, different steps need not be executed in such an order, and they may be executed simultaneously (in parallel) or in reverse order, and these simple changes are within the scope of the present invention. For example, the step of obtaining the inlet and outlet pressures of the indoor heat exchanger may be performed simultaneously, or may be performed sequentially, etc.
So far, the technical solutions of the present invention 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 invention 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 invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (7)

1. A self-cleaning control method in an indoor unit pipe of an air conditioning system comprises a compressor, an outdoor heat exchanger, an outdoor fan, a first throttling element, an indoor heat exchanger, an indoor fan and an oil controller, wherein the compressor is provided with a liquid storage device, a filter screen is arranged in the liquid storage device, the oil controller comprises a shell, an inlet pipe, an outlet pipe and an oil return pipe, the inlet pipe, the outlet pipe and the oil return pipe are arranged on the shell, the oil return pipe is communicated with an inlet of the liquid storage device, a second throttling element is arranged between the oil return pipe and the inlet of the liquid storage device,
the indoor unit pipe self-cleaning control method comprises the following steps:
after the air conditioning system runs for a set time, acquiring the inlet pressure and the outlet pressure of the indoor heat exchanger;
calculating an inlet-outlet pressure difference based on the inlet pressure and the outlet pressure of the indoor heat exchanger;
comparing the inlet-outlet pressure difference with a pressure difference threshold value;
selectively controlling the air conditioning system to execute a self-cleaning mode in the indoor unit pipe based on the comparison result;
when the indoor unit operates in a self-cleaning mode in the pipe, at least part of impurities in the indoor heat exchanger can flow into the liquid storage device together with a refrigerant and refrigerating machine oil;
the step of selectively controlling the air conditioning system to execute the indoor unit in-pipe self-cleaning mode based on the comparison result further comprises the following steps:
when the pressure difference between the inlet and the outlet is greater than or equal to the pressure difference threshold value, controlling the air conditioning system to execute a self-cleaning mode in the indoor unit pipe;
the step of controlling the air conditioning system to execute the self-cleaning mode in the indoor unit tube further comprises the following steps:
acquiring a working mode of the air conditioning system;
when the air conditioning system operates in a refrigeration mode, controlling the air conditioning system to execute a first in-pipe self-cleaning step;
when the air-conditioning system operates in a heating mode, controlling the air-conditioning system to execute a second in-pipe self-cleaning step;
the self-cleaning step in the first tube comprises:
controlling the air conditioning system to adjust to the following states and continuously operating for a first set time: the compressor is operated at a first set frequency, the outdoor fan is operated at a maximum wind speed, the indoor fan is operated at a minimum wind speed, the first throttling element is operated at a maximum opening degree, and the second throttling element is closed;
controlling the air conditioning system to adjust to the following states and continuously operating for a second set time length: the compressor stops operating, the outdoor fan stops operating, the indoor fan operates in a natural wind mode, the first throttling element is closed, and the second throttling element operates at a maximum opening degree.
2. The method as claimed in claim 1, wherein the step of selectively controlling the air conditioning system to perform the self-cleaning mode in the indoor unit based on the comparison result further comprises:
and when the inlet-outlet pressure difference is smaller than the pressure difference threshold value, controlling the air conditioning system to keep the current running state.
3. The method of claim 1, wherein the step of self-cleaning inside the second tube comprises:
controlling the air conditioning system to adjust to the following states and continuously operating for a third set time length: the compressor is operated at a second set frequency, the outdoor fan is stopped, the indoor fan is operated at a medium air speed, the first throttling element is closed, and the second throttling element is operated at a maximum opening degree;
controlling the air conditioning system to adjust to the following states and continuously operating for a fourth set time length: the compressor stops operating, the outdoor fan and the indoor fan both stop operating, the first throttling element is closed, and the second throttling element operates at a maximum opening degree.
4. The method of claim 1, further comprising:
and after the execution of the self-cleaning mode in the indoor unit pipe is finished, controlling the air-conditioning system to recover to the state before the execution of the self-cleaning mode in the indoor unit pipe to continue running.
5. The method of claim 1, wherein the inlet-outlet pressure difference is calculated by the following equation:
P＝ABS(P eva-in -P eva-out )
wherein P is the inlet-outlet pressure difference, P eva-in Is the inlet pressure of the indoor heat exchanger; the P is eva-out The ABS represents an absolute value for the outlet pressure of the indoor heat exchanger.
6. The method of claim 1, wherein the inlet pipe is in communication with an outlet of the outdoor heat exchanger, the outlet pipe is in communication with an inlet of the indoor heat exchanger, and the first throttling element is disposed between the outlet pipe and the inlet of the indoor heat exchanger.
7. The method of claim 1, wherein the first throttling element is an electronic expansion valve; and/or the second throttling element is an electronic expansion valve or an electromagnetic valve with controllable opening degree.
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JPH09280789A (en) * 1996-04-09 1997-10-31 Nippon P-Mac Kk Heat exchanger and method for cleaning coil with fin
CN204202062U (en) * 2014-09-18 2015-03-11 江苏辛普森新能源有限公司 With the water-cooled cooling water air conditioner unit of ice-reserving function
CN105299956A (en) * 2015-10-16 2016-02-03 珠海格力电器股份有限公司 Compressor oil return control device and method, and air conditioner with device
CN108870637A (en) * 2018-08-06 2018-11-23 合肥天鹅制冷科技有限公司 A kind of dirty stifled warning device of condenser

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09280789A (en) * 1996-04-09 1997-10-31 Nippon P-Mac Kk Heat exchanger and method for cleaning coil with fin
CN204202062U (en) * 2014-09-18 2015-03-11 江苏辛普森新能源有限公司 With the water-cooled cooling water air conditioner unit of ice-reserving function
CN105299956A (en) * 2015-10-16 2016-02-03 珠海格力电器股份有限公司 Compressor oil return control device and method, and air conditioner with device
CN108870637A (en) * 2018-08-06 2018-11-23 合肥天鹅制冷科技有限公司 A kind of dirty stifled warning device of condenser

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