CN114992800B - Self-cleaning control method for shutdown stage of air conditioning system and air conditioning system - Google Patents
Self-cleaning control method for shutdown stage of air conditioning system and air conditioning system Download PDFInfo
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- CN114992800B CN114992800B CN202210494806.5A CN202210494806A CN114992800B CN 114992800 B CN114992800 B CN 114992800B CN 202210494806 A CN202210494806 A CN 202210494806A CN 114992800 B CN114992800 B CN 114992800B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 107
- 238000004140 cleaning Methods 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000003507 refrigerant Substances 0.000 claims abstract description 16
- 230000001276 controlling effect Effects 0.000 claims description 45
- 238000004891 communication Methods 0.000 claims description 27
- 230000000875 corresponding effect Effects 0.000 claims description 10
- 230000002596 correlated effect Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 15
- 239000007788 liquid Substances 0.000 description 5
- 239000000428 dust Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010257 thawing Methods 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
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/20—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation
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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
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/90—Cleaning of purification apparatus
-
- 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
- F25B41/31—Expansion valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air conditioners, in particular to a self-cleaning control method for an air conditioning system in a shutdown stage and the air conditioning system, and aims to solve the problem that an outdoor heat exchanger of the existing air conditioning system is poor in self-cleaning effect. The air conditioning system comprises a refrigerant circulation loop, a compressor, an indoor heat exchanger, an indoor electronic expansion valve, a first outdoor heat exchange branch, a second outdoor heat exchange branch and a plurality of control valves, wherein the compressor, the indoor heat exchanger, the indoor electronic expansion valve, the first outdoor heat exchange branch and the plurality of control valves are arranged on the refrigerant circulation loop, the first outdoor heat exchanger and the first outdoor electronic expansion valve are arranged on the first outdoor heat exchange branch, and the second outdoor heat exchanger and the second outdoor electronic expansion valve are arranged on the second outdoor heat exchange branch.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides a self-cleaning control method for an air conditioning system in a shutdown stage and the air conditioning system.
Background
With the development of economic level, people have higher and higher requirements on the comfort level of the air conditioner, and particularly, people pay attention to the problem that the air conditioner is easy to cause air conditioner diseases when the air conditioner is blown for a long time. The dust on the surface of the heat exchanger is cleaned regularly, so that the heat exchange effect of the air conditioner can be guaranteed, the air supply quality of the indoor unit of the air conditioner can be effectively guaranteed, and the health of a user is further effectively guaranteed. However, the self-cleaning mode of the existing air conditioning system is usually to remove dust on the surface of the outdoor heat exchanger after heating and defrosting, so that the outdoor heat exchanger cannot be cleaned and sterilized when the air conditioning system is in a shutdown stage, and the untimely cleaning and sterilizing not only affects the heat exchange effect of the air conditioning system, but also threatens the health of users.
Accordingly, there is a need in the art for a new self-cleaning control method for an air conditioning system shutdown phase and an air conditioning system to address the above-described problems.
Disclosure of Invention
The invention aims to solve the technical problems, namely the problem that the self-cleaning effect of the outdoor heat exchanger of the existing air conditioning system is poor.
In a first aspect, the present invention provides a self-cleaning control method for a shutdown phase of an air conditioning system, the air conditioning system comprising a refrigerant circulation loop, and a compressor, an indoor heat exchanger, an indoor electronic expansion valve, a first outdoor heat exchange branch, a second outdoor heat exchange branch and a plurality of control valves arranged on the refrigerant circulation loop, the first outdoor heat exchange branch being provided with a first outdoor heat exchanger and a first outdoor electronic expansion valve, the second outdoor heat exchange branch being provided with a second outdoor heat exchanger and a second outdoor electronic expansion valve, the plurality of control valves being arranged to enable a refrigerant circulation path to be changed;
the self-cleaning control method comprises the following steps:
when the air conditioning system is in a stop state and the outdoor heat exchanger needs to be self-cleaned, controlling the communication state of the plurality of control valves so that the outdoor heat exchanger needing to be self-cleaned is used as an evaporator and the other outdoor heat exchanger is used as a condenser;
and controlling the opening of the corresponding outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the outdoor heat exchanger to be self-cleaned.
In the above preferred technical solution of the self-cleaning control method, the step of controlling the communication state of the plurality of control valves so that the outdoor heat exchanger requiring self-cleaning is used as the evaporator and the other outdoor heat exchanger is used as the condenser when the air conditioning system is in the stopped state and the outdoor heat exchanger requires self-cleaning specifically includes:
when the air conditioning system is in a shutdown state and the first outdoor heat exchanger needs to be self-cleaned, controlling the communication state of the plurality of control valves so that the first outdoor heat exchanger functions as an evaporator and the second outdoor heat exchanger functions as a condenser;
the step of controlling the opening degree of the corresponding outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the outdoor heat exchanger needing self-cleaning specifically comprises:
and controlling the opening degree of the first outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the first outdoor heat exchanger.
In the above preferred technical solution of the self-cleaning control method, the step of controlling the opening degree of the first outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the first outdoor heat exchanger specifically includes:
and controlling the opening degree of the first outdoor electronic expansion valve according to the difference value between the saturation temperature of the air conditioning system and the outlet temperature of the first outdoor heat exchanger.
In the above preferred technical solution of the self-cleaning control method, the step of controlling the opening degree of the first outdoor electronic expansion valve according to the difference between the saturation temperature of the air conditioning system and the outlet temperature of the first outdoor heat exchanger specifically includes:
the saturation temperature of the air conditioning system is positively correlated with the difference between the outlet temperature of the first outdoor heat exchanger and the opening degree of the first outdoor electronic expansion valve.
In the preferred technical solution of the self-cleaning control method, when the air conditioning system is in a stop state and the first outdoor heat exchanger needs to be self-cleaned, the control method further includes:
and controlling the second outdoor electronic expansion valve to operate at the maximum opening.
In the above preferred technical solution of the self-cleaning control method, the step of controlling the communication state of the plurality of control valves so that the outdoor heat exchanger requiring self-cleaning is used as the evaporator and the other outdoor heat exchanger is used as the condenser when the air conditioning system is in the stopped state and the outdoor heat exchanger requires self-cleaning specifically includes:
when the air conditioning system is in a shutdown state and the second outdoor heat exchanger needs to be self-cleaned, controlling the communication state of the plurality of control valves so that the second outdoor heat exchanger functions as an evaporator and the first outdoor heat exchanger functions as a condenser;
the step of controlling the opening degree of the corresponding outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the outdoor heat exchanger needing self-cleaning specifically comprises:
and controlling the opening degree of the second outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger.
In the above preferred technical solution of the self-cleaning control method, the step of controlling the opening degree of the second outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger specifically includes:
and controlling the opening degree of the second outdoor electronic expansion valve according to the difference value between the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger.
In the above preferred technical solution of the self-cleaning control method, the step of controlling the opening degree of the second outdoor electronic expansion valve according to the difference between the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger specifically includes:
and the difference between the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger is positively correlated with the opening degree of the second outdoor electronic expansion valve.
In the preferred technical solution of the self-cleaning control method, when the air conditioning system is in a stop state and the second outdoor heat exchanger needs to be self-cleaned, the control method further includes:
and controlling the first outdoor electronic expansion valve to operate at the maximum opening.
In another aspect, the present invention also provides an air conditioning system comprising a controller configured to be able to perform the self-cleaning control method as described in any one of the above preferred technical solutions.
Under the condition of adopting the technical scheme, the air conditioning system provided by the invention has the advantages that the communication states of the control valves are controlled so that the outdoor heat exchanger needing to be self-cleaned is used as an evaporator, the other outdoor heat exchanger is used as a condenser, and the opening degree of the corresponding outdoor electronic expansion valve is controlled according to the saturation temperature of the air conditioning system and the outlet temperature of the outdoor heat exchanger needing to be self-cleaned, so that the purposes of effectively cleaning and sterilizing the outdoor heat exchanger when the air conditioning system is in a shutdown state are realized, and the heat exchange effect and the air supply quality of the air conditioning system are further effectively ensured.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of the overall structure of an air conditioning system of the present invention;
FIG. 2 is a flow chart of the main steps of the self-cleaning control method of the present invention;
FIG. 3 is a flowchart of the specific steps of a first preferred embodiment of the self-cleaning control method of the present invention;
FIG. 4 is a flowchart of the specific steps of a second preferred embodiment of the self-cleaning control method of the present invention;
reference numerals:
1. a refrigerant circulation circuit;
2. a compressor;
3. an indoor heat exchanger;
4. an indoor electronic expansion valve;
5. a first outdoor heat exchange branch; 51. a first outdoor heat exchanger; 52. a first outdoor electronic expansion valve;
6. a second outdoor heat exchange branch; 61. a second outdoor heat exchanger; 62. a second outdoor electronic expansion valve;
7. a control valve; 71. a first four-way valve; 72. a second four-way valve; 73. a third four-way valve;
8. a plate heat exchanger;
9. a gas-liquid separator;
10. and a connection branch.
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 merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. Those skilled in the art can adapt it as desired to suit a particular application. For example, the present invention does not limit the specific application object of the self-cleaning control method, and the self-cleaning control method may be used in a wall-mounted air conditioning system, a ceiling-mounted air conditioning system, or a cabinet-type air conditioning system, which is not limiting, and a technician may set the application object of the self-cleaning control method according to the actual use requirement. Such changes as to the application object do not deviate from the basic principle of the invention and fall within the protection scope of the invention.
It should be noted that, in the description of the preferred embodiment, terms such as "inner", "outer", and the like, refer to directions or positional relationships 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 apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.
Furthermore, in the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and for example, may be directly connected, may be indirectly connected through an intermediary, or may be in communication with the interior of two elements. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances. Although the various steps of the control method of the present invention are described in a particular order in this application, these orders are not limiting and one skilled in the art may perform the steps in a different order without departing from the basic principles of the invention.
Referring first to fig. 1, fig. 1 is a schematic diagram of an overall structure of an air conditioning system according to the present invention. As shown in fig. 1, the air conditioning system of the present invention includes a refrigerant circulation circuit 1, a compressor 2, an indoor heat exchanger 3, an indoor electronic expansion valve 4, a first outdoor heat exchange branch 5, a second outdoor heat exchange branch 6, and three control valves 7 disposed on the refrigerant circulation circuit 1, wherein the first outdoor heat exchange branch 5 is provided with a first outdoor heat exchanger 51 and a first outdoor electronic expansion valve 52, the first outdoor electronic expansion valve 52 can control the communication state of the first outdoor heat exchange branch 5, the second outdoor heat exchange branch 6 is provided with a second outdoor heat exchanger 61 and a second outdoor electronic expansion valve 62, the second outdoor electronic expansion valve 62 can control the communication state of the second outdoor heat exchange branch 6, and the three control valves 7 are disposed to be capable of changing the refrigerant circulation path. Of course, it should be noted that the specific number of the outdoor heat exchange branches is not limited, and those skilled in the art can set the outdoor heat exchange branches according to the actual use requirements.
In addition, it should be noted that the specific structures of the compressor 2, the indoor heat exchanger 3, the first outdoor heat exchanger 51 and the second outdoor heat exchanger 61 are not limited in the present invention, and the compressor 2 may be a fixed-frequency compressor or a variable-frequency compressor; the indoor heat exchanger 3, the first outdoor heat exchanger 51, and the second outdoor heat exchanger 61 may be plate heat exchangers or shell-and-tube heat exchangers, which are not limitative. In addition, the present invention does not limit the specific types of the indoor electronic expansion valve 4, the first outdoor electronic expansion valve 52, the second outdoor electronic expansion valve 62 and the control valve 7 and the specific number and specific arrangement of the control valves 7, as long as it is possible to set one of the first outdoor heat exchanger 51 and the second outdoor heat exchanger 61 as an evaporator and the other as a condenser by controlling the communication state or the opening degree of the first outdoor electronic expansion valve 52, the second outdoor electronic expansion valve 62 and the control valve 7, thereby realizing the alternate cleaning of the first outdoor heat exchanger 51 and the second outdoor heat exchanger 61. Preferably, the number of the control valves 7 is three, namely, the first four-way valve 71, the second four-way valve 72 and the third four-way valve 73.
Further, the refrigerant circulation loop 1 is also provided with a plate heat exchanger 8 and a gas-liquid separator 9, the plate heat exchanger 8 is arranged between the outdoor electronic expansion valve and the indoor electronic expansion valve 4, and the gas-liquid separator 9 is connected with the first four-way valve 71, the second four-way valve 72 and the third four-way valve 73. The air conditioning system further comprises a connecting branch 10, the connecting branch 10 is connected with the refrigerant circulation loop 1, one end of the connecting branch 10 is connected to the plate heat exchanger 8, and the other end of the connecting branch 10 is connected between the gas-liquid separator 9 and the control valve 7.
It should be noted that, the specific structure of the plate heat exchanger 8 and the gas-liquid separator 9 is not limited in the present invention, and the specific structure of the air conditioning system is not limited in any way, and can be set by those skilled in the art according to practical situations.
Further, the air conditioning system further includes a plurality of temperature sensors capable of detecting the outlet temperature and the inlet temperature of the first outdoor heat exchanger 51 and the second outdoor heat exchanger 61, respectively, and a controller capable of acquiring detection data of the temperature sensors, and also capable of controlling the operation state of the air conditioning system, for example, the communication state of the control valve 7, the opening degrees of the first outdoor electronic expansion valve 52 and the second outdoor electronic expansion valve 62, and the like. It should be noted that the specific setting position, model and setting number of the temperature sensor are not limited in the invention, and the temperature sensor can be set by a person skilled in the art according to actual conditions; and the invention does not limit the specific structure and model of the controller, and the controller can be the original controller of the air conditioning system or the controller independently arranged for executing the self-cleaning control method of the invention, and the structure and model of the controller can be set by a person skilled in the art according to the actual use requirement.
Referring next to fig. 2, a flow chart of main steps of the self-cleaning control method of the present invention is shown. As shown in fig. 2, based on the air conditioning system described in the above embodiment, the self-cleaning control method of the present invention mainly includes the following steps:
s1: when the air conditioning system is in a stop state and the outdoor heat exchanger needs to be self-cleaned, controlling the communication state of the plurality of control valves so that the outdoor heat exchanger needing to be self-cleaned is used as an evaporator and the other outdoor heat exchanger is used as a condenser;
s2: and controlling the opening of the corresponding outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the outdoor heat exchanger needing self-cleaning.
First, in step S1, when the air conditioning system is in a stopped state and the outdoor heat exchanger needs to be self-cleaned, the controller controls the communication state of the plurality of control valves 7 so that the outdoor heat exchanger that needs to be self-cleaned functions as an evaporator and the other outdoor heat exchanger functions as a condenser, so that the outdoor heat exchanger of the present invention can be self-cleaned.
It should be noted that, the specific judging mode of whether the outdoor heat exchanger needs cleaning is not limited, and the method can be used for judging according to the running time of the air conditioning system and judging according to the heat exchanging effect when the air conditioning system is in the running state, which is not limiting, and can be set by a person skilled in the art according to the actual situation.
In addition, it should be noted that the present invention does not limit the specific control manner of the plurality of control valves 7 by the controller, so long as the outdoor heat exchanger that needs to be self-cleaned can be used as an evaporator and the other outdoor heat exchanger can be used as a condenser by controlling the communication state of the control valves 7, so as to realize self-cleaning of the outdoor heat exchanger, which can be set by a person skilled in the art according to practical situations.
Next, in step S2, the controller controls the opening of the corresponding outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the outdoor heat exchanger to be cleaned, so as to further improve the cleaning effect of the outdoor heat exchanger.
It should be noted that, the present invention does not limit the specific acquisition mode and specific acquisition time of the saturation temperature of the air conditioning system and the outlet temperature of the outdoor heat exchanger to be self-cleaned, and the specific acquisition mode and specific acquisition time can be acquired in real time or at intervals of a certain time; the heat exchanger can be obtained when the outdoor heat exchanger starts to be self-cleaned, and can be obtained at any time in the self-cleaning process of the outdoor heat exchanger, which is not limitative, and can be set by a person skilled in the art according to practical situations.
In addition, it should be noted that the specific opening degree of the outdoor electronic expansion valve is not limited in the invention, and the person skilled in the art can set the valve according to the actual cleaning condition of the outdoor heat exchanger.
First preferred embodiment
Referring next to fig. 3, a flowchart of specific steps of a first preferred embodiment of the self-cleaning control method of the present invention is shown. As shown in fig. 3, based on the air conditioning system described in the above preferred embodiment, a first preferred embodiment of the self-cleaning control method of the present invention specifically includes the steps of:
s101: when the air conditioning system is in a stop state and the first outdoor heat exchanger needs to be self-cleaned, controlling the communication state of the plurality of control valves so that the first outdoor heat exchanger serves as an evaporator and the second outdoor heat exchanger serves as a condenser;
s102: the difference value between the saturation temperature of the air conditioning system and the outlet temperature of the first outdoor heat exchanger is positively correlated with the opening degree of the first outdoor electronic expansion valve;
s103: and controlling the second outdoor electronic expansion valve to operate at the maximum opening.
First, in step S101, when the air conditioning system is in a stopped state and the first outdoor heat exchanger 51 needs to be self-cleaned, the controller controls the communication state of the plurality of control valves 7 such that the first outdoor heat exchanger 51 functions as an evaporator and the second outdoor heat exchanger 61 functions as a condenser to clean the first outdoor heat exchanger 51.
It should be noted that, the specific determination mode of whether the first outdoor heat exchanger 51 needs to be cleaned is not limited, and the determination may be performed according to the time period that the air conditioning system is already running, or may be performed according to the heat exchange effect when the air conditioning system is in the running state, which is not limited, and may be set by a person skilled in the art according to the actual situation.
In addition, the present invention is not limited to the specific control manner of the plurality of control valves 7 by the controller, as long as the communication state of the control valves 7 can be controlled so that the first outdoor heat exchanger 51 required to perform self-cleaning is used as an evaporator and the second outdoor heat exchanger 61 is used as a condenser, thereby realizing self-cleaning of the first outdoor heat exchanger 51, and those skilled in the art can set the device according to actual situations.
In the present embodiment, when cleaning of the first outdoor heat exchanger 51 is required, the controller controls the first four-way valve 71 to be in an energized state, and the second and third four-way valves 72 and 73 to be in a de-energized state. Based on this communication state, the high-pressure refrigerant flowing out of the compressor 2 first enters the second outdoor heat exchanger 61 through the second four-way valve 72, and after flowing through the second outdoor electronic expansion valve 62, enters the first outdoor heat exchanger 51 through the first outdoor electronic expansion valve 52, so that the first outdoor heat exchanger 51 functions as an evaporator, thereby achieving a cleaning effect thereof.
Further, the controller obtains the saturation temperature of the air conditioning system and the outlet temperature of the first outdoor heat exchanger 51, and controls the opening of the first outdoor electronic expansion valve 52 according to the saturation temperature of the air conditioning system and the outlet temperature of the first outdoor heat exchanger 51, so as to further improve the cleaning effect of the first outdoor heat exchanger 51.
It should be noted that, the specific control manner of the opening degree of the first outdoor electronic expansion valve 52 is not limited, for example, the controller may compare the saturation temperature of the air conditioning system, the outlet temperature of the first outdoor heat exchanger 51 and the preset temperature, and then control the opening degree of the first outdoor electronic expansion valve 52 according to the comparison result, which is not limited, and those skilled in the art may set the opening degree according to the actual situation.
Preferably, in step S102, the controller controls the opening degree of the first outdoor electronic expansion valve 52 according to the difference between the saturation temperature of the air conditioning system and the outlet temperature of the first outdoor heat exchanger 51, specifically, the difference between the saturation temperature of the air conditioning system and the outlet temperature of the first outdoor heat exchanger 51 and the opening degree of the first outdoor electronic expansion valve 52 are positively correlated.
It should be noted that, the specific adjustment range of the opening degree of the first outdoor electronic expansion valve 52 is not limited in the present invention, and a person skilled in the art may set the adjustment range according to the actual cleaning condition of the first outdoor heat exchanger 51.
Further, in step S103, the controller controls the second outdoor electronic expansion valve 62 to operate at the maximum opening degree to further secure the cleaning effect of the first outdoor heat exchanger 51.
It should be noted that, the specific execution sequence of the step S102 and the step S103 is not limited in the present invention, and may be executed simultaneously or sequentially without being sequenced, which is not limited, and may be set by a person skilled in the art according to the actual situation.
Second preferred embodiment
Referring next to fig. 4, a flowchart of specific steps of a second preferred embodiment of the self-cleaning control method of the present invention is shown. As shown in fig. 4, based on the air conditioning system described in the above preferred embodiment, a second preferred embodiment of the self-cleaning control method of the present invention specifically includes the steps of:
s201: when the air conditioning system is in a stop state and the second outdoor heat exchanger needs to be self-cleaned, controlling the communication state of the plurality of control valves so that the second outdoor heat exchanger serves as an evaporator and the first outdoor heat exchanger serves as a condenser;
s202: the difference value between the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger is positively correlated with the opening degree of the second outdoor electronic expansion valve;
s203: and controlling the first outdoor electronic expansion valve to operate at the maximum opening.
First, in step S201, when the air conditioning system is in a stopped state and the second outdoor heat exchanger 61 needs to be self-cleaned, the controller controls the communication state of the plurality of control valves 7 such that the second outdoor heat exchanger 61 functions as an evaporator and the first outdoor heat exchanger 51 functions as a condenser to clean the second outdoor heat exchanger 61.
It should be noted that, the specific determination mode of whether the second outdoor heat exchanger 61 needs to be cleaned is not limited in the present invention, and the determination may be performed according to the already operating time of the air conditioning system, or may be performed according to the heat exchange effect when the air conditioning system is in the operating state, which is not limited, and may be set by a person skilled in the art according to the actual situation.
In addition, the present invention is not limited to the specific control manner of the plurality of control valves 7 by the controller, as long as the communication state of the control valves 7 can be controlled so that the second outdoor heat exchanger 61 requiring self-cleaning is used as an evaporator and the first outdoor heat exchanger 51 is used as a condenser, thereby realizing self-cleaning of the second outdoor heat exchanger 61, and those skilled in the art can set the device according to the actual situation.
In the present embodiment, when cleaning of the second outdoor heat exchanger 61 is required, the controller controls the second four-way valve 72 to be in an energized state, and the first and third four-way valves 71 and 73 to be in a de-energized state. Based on this communication state, the high-pressure refrigerant flowing out of the compressor 2 first enters the first outdoor heat exchanger 51 through the first four-way valve 71, and after flowing through the first outdoor electronic expansion valve 52, enters the second outdoor heat exchanger 61 through the second outdoor electronic expansion valve 62, so that the second outdoor heat exchanger 61 functions as an evaporator, thereby achieving a cleaning effect thereof.
Further, the controller obtains the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger 61, and controls the opening of the second outdoor electronic expansion valve 62 according to the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger 61, so as to further improve the cleaning effect of the second outdoor heat exchanger 61.
It should be noted that the specific control manner of the opening degree of the second outdoor electronic expansion valve 62 is not limited, for example, the controller may compare the saturation temperature of the air conditioning system, the outlet temperature of the second outdoor heat exchanger 61 and the preset temperature, and then control the opening degree of the second outdoor electronic expansion valve 62 according to the comparison result, which is not limited, and those skilled in the art may set the opening degree according to the actual situation.
Preferably, in step S202, the controller controls the opening degree of the second outdoor electronic expansion valve 62 according to the difference between the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger 61, specifically, the difference between the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger 61 and the opening degree of the second outdoor electronic expansion valve 62 are positively correlated.
It should be noted that, the specific adjustment range of the opening degree of the second outdoor electronic expansion valve 62 is not limited in the present invention, and a person skilled in the art may set the adjustment range according to the actual cleaning condition of the second outdoor heat exchanger 61.
Further, in step S203, the controller controls the first outdoor electronic expansion valve 52 to operate at the maximum opening degree to further secure the cleaning effect of the second outdoor heat exchanger 61.
It should be noted that, the specific execution sequence of the step S202 and the step S203 is not limited in the present invention, and may be executed simultaneously or sequentially without being separated from each other, which is not limited, and may be set by a person skilled in the art according to the actual situation.
Thus far, the technical solution of the present invention 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 invention 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 invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (10)
1. The self-cleaning control method for the shutdown stage of the air conditioning system is characterized in that the air conditioning system comprises a refrigerant circulation loop, a compressor, an indoor heat exchanger, an indoor electronic expansion valve, a first outdoor heat exchange branch, a second outdoor heat exchange branch and a plurality of control valves, wherein the compressor, the indoor heat exchanger, the indoor electronic expansion valve, the first outdoor heat exchange branch, the second outdoor heat exchange branch and the plurality of control valves are arranged on the refrigerant circulation loop, the first outdoor heat exchange branch is provided with the first outdoor heat exchanger and the first outdoor electronic expansion valve, the second outdoor heat exchange branch is provided with the second outdoor heat exchanger and the second outdoor electronic expansion valve, and the plurality of control valves are arranged to change a refrigerant circulation path;
the self-cleaning control method comprises the following steps:
when the air conditioning system is in a stop state and the outdoor heat exchanger needs to be self-cleaned, controlling the communication state of the plurality of control valves so that the outdoor heat exchanger needing to be self-cleaned is used as an evaporator and the other outdoor heat exchanger is used as a condenser;
controlling the opening of a corresponding outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the outdoor heat exchanger to be self-cleaned;
an outdoor electronic expansion valve corresponding to an outdoor heat exchanger serving as a condenser is controlled to operate at a maximum opening degree.
2. The self-cleaning control method according to claim 1, wherein the step of controlling the communication state of the plurality of control valves so that the outdoor heat exchanger requiring self-cleaning functions as an evaporator and the other outdoor heat exchanger functions as a condenser when the air conditioning system is in a stopped state and the outdoor heat exchanger requires self-cleaning specifically comprises:
when the air conditioning system is in a shutdown state and the first outdoor heat exchanger needs to be self-cleaned, controlling the communication state of the plurality of control valves so that the first outdoor heat exchanger functions as an evaporator and the second outdoor heat exchanger functions as a condenser;
the step of controlling the opening degree of the corresponding outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the outdoor heat exchanger needing self-cleaning specifically comprises:
and controlling the opening degree of the first outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the first outdoor heat exchanger.
3. The self-cleaning control method according to claim 2, wherein the step of controlling the opening degree of the first outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the first outdoor heat exchanger specifically includes:
and controlling the opening degree of the first outdoor electronic expansion valve according to the difference value between the saturation temperature of the air conditioning system and the outlet temperature of the first outdoor heat exchanger.
4. A self-cleaning control method according to claim 3, wherein the step of controlling the opening degree of the first outdoor electronic expansion valve according to the difference between the saturation temperature of the air conditioning system and the outlet temperature of the first outdoor heat exchanger specifically comprises:
the saturation temperature of the air conditioning system is positively correlated with the difference between the outlet temperature of the first outdoor heat exchanger and the opening degree of the first outdoor electronic expansion valve.
5. The self-cleaning control method according to claim 2, wherein when the air conditioning system is in a stopped state and the first outdoor heat exchanger needs to be self-cleaned, the control method further comprises:
and controlling the second outdoor electronic expansion valve to operate at the maximum opening.
6. The self-cleaning control method according to claim 1, wherein the step of controlling the communication state of the plurality of control valves so that the outdoor heat exchanger requiring self-cleaning functions as an evaporator and the other outdoor heat exchanger functions as a condenser when the air conditioning system is in a stopped state and the outdoor heat exchanger requires self-cleaning specifically comprises:
when the air conditioning system is in a shutdown state and the second outdoor heat exchanger needs to be self-cleaned, controlling the communication state of the plurality of control valves so that the second outdoor heat exchanger functions as an evaporator and the first outdoor heat exchanger functions as a condenser;
the step of controlling the opening degree of the corresponding outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the outdoor heat exchanger needing self-cleaning specifically comprises:
and controlling the opening degree of the second outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger.
7. The self-cleaning control method according to claim 6, wherein the step of controlling the opening degree of the second outdoor electronic expansion valve according to the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger specifically includes:
and controlling the opening degree of the second outdoor electronic expansion valve according to the difference value between the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger.
8. The self-cleaning control method according to claim 7, wherein the step of controlling the opening degree of the second outdoor electronic expansion valve according to the difference between the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger specifically comprises:
and the difference between the saturation temperature of the air conditioning system and the outlet temperature of the second outdoor heat exchanger is positively correlated with the opening degree of the second outdoor electronic expansion valve.
9. The self-cleaning control method according to claim 6, wherein when the air conditioning system is in a stopped state and the second outdoor heat exchanger is required to be self-cleaned, the control method further comprises:
and controlling the first outdoor electronic expansion valve to operate at the maximum opening.
10. An air conditioning system, characterized in that it comprises a controller configured to be able to perform the self-cleaning control method according to any one of claims 1 to 9.
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| JP2021124227A (en) * | 2020-02-03 | 2021-08-30 | 東芝ライフスタイル株式会社 | Outdoor unit of air conditioner and air conditioner |
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| CN114992800A (en) | 2022-09-02 |
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