CN118376019A - Air conditioner and control method thereof - Google Patents

Air conditioner and control method thereof Download PDF

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Publication number
CN118376019A
CN118376019A CN202410427736.0A CN202410427736A CN118376019A CN 118376019 A CN118376019 A CN 118376019A CN 202410427736 A CN202410427736 A CN 202410427736A CN 118376019 A CN118376019 A CN 118376019A
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CN
China
Prior art keywords
valve
air conditioner
subcooler
supercooling degree
pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202410427736.0A
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Chinese (zh)
Inventor
卢国涛
招伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hisense Guangdong Air Conditioning Co Ltd
Original Assignee
Hisense Guangdong Air Conditioning Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hisense Guangdong Air Conditioning Co Ltd filed Critical Hisense Guangdong Air Conditioning Co Ltd
Priority to CN202410427736.0A priority Critical patent/CN118376019A/en
Publication of CN118376019A publication Critical patent/CN118376019A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • 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
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • 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)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioner and a control method of the air conditioner, the air conditioner comprises a refrigerating system, the refrigerating system comprises a closed circulation channel formed by connecting a compressor, a four-way valve, an outdoor heat exchanger, a subcooler, an electronic expansion valve and a vapor-liquid separator through pipelines, and a refrigerant flows in the circulation channel; the refrigerating system further comprises an electromagnetic valve, a capillary tube and a one-way valve, wherein the bottom of the vapor-liquid separator is connected with the inlet end of an air pipe of the subcooler through the electromagnetic valve, the capillary tube and the one-way valve in sequence, and the outlet end of the air pipe of the subcooler is connected with an air suction pipe of the compressor; the air conditioner further includes a controller for: when the refrigeration system starts the supercooling function, the electromagnetic valve is opened; judging whether the opening time of the electromagnetic valve reaches the target time; if yes, judging whether the actual supercooling degree reaches the target supercooling degree; if so, the electronic expansion valve is closed. By adopting the technical scheme of the invention, the problem of low flow of the refrigerant entering the indoor unit can be solved.

Description

Air conditioner and control method thereof
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method of the air conditioner.
Background
In an air conditioning unit (multi-split unit) using a subcooler, a refrigerant exiting from an outdoor heat exchanger is a high-temperature and high-pressure liquid, and is divided into two paths: the first path of refrigerant enters a liquid pipe of a subcooler to exchange heat, and then enters an indoor unit to perform throttling evaporation and refrigeration; the second path of refrigerant is throttled by an electronic expansion valve, the pressure and the temperature of the refrigerant are further reduced, and the refrigerant enters a gas pipe of a subcooler for heat exchange and then enters a vapor-liquid separator, and finally returns to a compressor; the refrigerant in the air pipe of the subcooler evaporates due to the heat of the refrigerant outside the absorption pipe (i.e., the refrigerant in the liquid pipe of the subcooler) to become refrigerant gas; the refrigerant in the liquid pipe of the subcooler is absorbed in heat, so that the temperature of the refrigerant is further reduced, and a larger subcooling degree is obtained.
However, since the second path (the gas pipe passing through the subcooler) refrigerant directly returns to the compressor, only the first path (the liquid pipe passing through the subcooler) refrigerant enters the indoor unit, resulting in less refrigerant flow entering the indoor unit and greater refrigerant flow loss, thereby affecting the refrigerating capacity and coefficient of performance of the refrigerating system.
Disclosure of Invention
An object of an embodiment of the present invention is to provide an air conditioner and a control method of the air conditioner, which can solve the problem that a refrigerating system using a subcooler has a small flow rate of refrigerant entering an indoor unit, effectively reduce the flow rate loss of the refrigerant entering the indoor unit, and increase the refrigerating capacity entering the indoor unit, thereby improving the refrigerating capacity and performance coefficient of the refrigerating system.
In order to achieve the above object, an embodiment of the present invention provides an air conditioner, including a refrigeration system including a closed circulation path formed by a compressor, a four-way valve, an outdoor heat exchanger, a subcooler, an electronic expansion valve, and a vapor-liquid separator connected by pipes, in which a refrigerant flows; the second end of the outdoor heat exchanger is divided into two paths: one path is connected with the inlet end of the air pipe of the subcooler through the electronic expansion valve, and the other path is connected with the inlet end of the liquid pipe of the subcooler;
The refrigerating system further comprises an electromagnetic valve, a capillary tube and a one-way valve, wherein the bottom of the vapor-liquid separator is connected with the inlet end of the air pipe of the subcooler through the electromagnetic valve, the capillary tube and the one-way valve in sequence, and the outlet end of the air pipe of the subcooler is connected with the air suction pipe of the compressor;
The air conditioner further includes:
the first temperature sensor is used for collecting the middle temperature of the outdoor heat exchanger;
The second temperature sensor is used for collecting the outlet temperature of the outdoor heat exchanger;
A controller for:
Opening the electromagnetic valve when the refrigeration system starts a supercooling function;
judging whether the opening time of the electromagnetic valve reaches a preset target time or not;
When the opening time reaches the target time, acquiring actual supercooling degree according to the middle temperature and the outlet temperature of the outdoor heat exchanger, and judging whether the actual supercooling degree reaches a preset target supercooling degree or not;
And closing the electronic expansion valve when the actual supercooling degree reaches the target supercooling degree.
Further, the controller is further configured to:
and when the actual supercooling degree does not reach the target supercooling degree, opening the electronic expansion valve.
Further, the controller is further configured to:
and when the refrigeration system does not start the supercooling function, the electronic expansion valve and the electromagnetic valve are closed.
Further, the refrigeration system further comprises a first stop valve, and the outlet end of the liquid pipe of the subcooler is connected with a first connecting pipe of the indoor unit part through the first stop valve.
Further, the refrigerating system further comprises a second stop valve, and an E interface of the four-way valve is connected with a second connecting pipe of the indoor unit part through the second stop valve.
In order to achieve the above object, an embodiment of the present invention further provides a control method of an air conditioner, which is applicable to any one of the air conditioners, where the method is performed by the controller, and the method includes:
Opening the electromagnetic valve when the refrigeration system starts a supercooling function;
judging whether the opening time of the electromagnetic valve reaches a preset target time or not;
When the opening time reaches the target time, acquiring actual supercooling degree according to the middle temperature and the outlet temperature of the outdoor heat exchanger, and judging whether the actual supercooling degree reaches a preset target supercooling degree or not;
And closing the electronic expansion valve when the actual supercooling degree reaches the target supercooling degree.
Further, the method further comprises:
and when the actual supercooling degree does not reach the target supercooling degree, opening the electronic expansion valve.
Further, the method further comprises:
and when the refrigeration system does not start the supercooling function, the electronic expansion valve and the electromagnetic valve are closed.
Further, the refrigeration system further comprises a first stop valve, and the outlet end of the liquid pipe of the subcooler is connected with a first connecting pipe of the indoor unit part through the first stop valve.
Further, the refrigerating system further comprises a second stop valve, and an E interface of the four-way valve is connected with a second connecting pipe of the indoor unit part through the second stop valve.
Compared with the prior art, the air conditioner and the control method thereof provided by the embodiment of the invention comprise a refrigerating system, wherein the refrigerating system comprises a closed circulating channel formed by connecting a compressor, a four-way valve, an outdoor heat exchanger, a subcooler, an electronic expansion valve and a vapor-liquid separator through pipelines, and a refrigerant flows in the circulating channel; the second end of the outdoor heat exchanger is divided into two paths: one path is connected with the inlet end of the air pipe of the subcooler through the electronic expansion valve, and the other path is connected with the inlet end of the liquid pipe of the subcooler; the refrigerating system further comprises an electromagnetic valve, a capillary tube and a one-way valve, wherein the bottom of the vapor-liquid separator is connected with the inlet end of an air pipe of the subcooler through the electromagnetic valve, the capillary tube and the one-way valve in sequence, and the outlet end of the air pipe of the subcooler is connected with an air suction pipe of the compressor; the air conditioner further includes: the first temperature sensor is used for collecting the middle temperature of the outdoor heat exchanger; the second temperature sensor is used for collecting the outlet temperature of the outdoor heat exchanger; a controller for: when the refrigeration system starts the supercooling function, the electromagnetic valve is opened; judging whether the opening time of the electromagnetic valve reaches a preset target time or not; when the opening time reaches the target time, acquiring the actual supercooling degree according to the middle temperature and the outlet temperature of the outdoor heat exchanger, and judging whether the actual supercooling degree reaches the preset target supercooling degree or not; and when the actual supercooling degree reaches the target supercooling degree, closing the electronic expansion valve. The embodiment of the invention can solve the problem that the flow rate of the refrigerant entering the indoor unit of the refrigeration system applying the subcooler is less, effectively reduces the flow loss of the refrigerant entering the indoor unit, and increases the refrigerating capacity entering the indoor unit, thereby improving the refrigerating capacity and the coefficient of performance of the refrigeration system.
Drawings
Fig. 1 is a schematic view of an external structure of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic view of an internal structure of an air conditioner according to the prior art;
Fig. 3 is a schematic view illustrating an internal structure of an air conditioner according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating an operation of a controller of an air conditioner according to an embodiment of the present invention;
Fig. 5 is a flowchart illustrating operations of a controller of an air conditioner according to another embodiment of the present invention;
fig. 6 is a flowchart illustrating operations of a controller of an air conditioner according to still another embodiment of the present invention;
FIG. 7 is a flowchart showing the overall operation of a controller of an air conditioner according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a control method of an air conditioner according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Referring to fig. 1, an external structure of an air conditioner according to an embodiment of the present invention includes an indoor unit 100 and an outdoor unit 200, wherein the indoor unit 100 is used for adjusting the temperature and humidity of indoor air, the outdoor unit 200 is connected to the indoor unit 100 through a connection pipe, the indoor unit 100 is generally installed indoors, and the outdoor unit 200 is generally installed outdoors.
It should be noted that the embodiment of the present invention is preferably applied to an air conditioner using a subcooler, for example, an air conditioning unit (multi-split unit) using a subcooler, where an indoor unit portion includes a plurality of indoor units connected in parallel, and fig. 1 shows an example in which only an indoor unit portion includes one indoor unit.
At present, the air conditioning unit (multi-split air conditioning unit) has longer connecting pipes from the outdoor unit to the indoor unit, and when the air conditioning unit operates in a refrigeration mode, the pressure loss of the refrigerant in the conveying process of the long connecting pipes is larger, so that part of liquid refrigerant is gasified before the refrigerant reaches the indoor unit, and the heat exchange efficiency of the indoor unit is reduced.
Referring to fig. 2, an internal structure diagram of an air conditioner provided in the prior art is a structure diagram of a refrigeration system corresponding to an outdoor unit, and the refrigeration system shown in fig. 2 includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a subcooler 4, an electronic expansion valve 5 and a vapor-liquid separator 6; the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the subcooler 4, the electronic expansion valve 5 and the vapor-liquid separator 6 are connected through pipelines to form a closed circulation channel, and a refrigerant flows in the circulation channel; the exhaust pipe of the compressor 1 is connected with the D interface of the four-way valve 2, the air suction pipe of the compressor 1 is connected with the outlet end of the vapor-liquid separator 6, the C interface of the four-way valve 2 is connected with the first end of the outdoor heat exchanger 3, and the second end of the outdoor heat exchanger 3 is divided into two paths: one path is connected with the inlet end of the liquid pipe 42 of the subcooler 4, the other path is connected with the inlet end of the air pipe 41 of the subcooler 4 through the electronic expansion valve 5, the outlet end of the air pipe 41 of the subcooler 4 is converged with the S interface of the four-way valve 2 and is connected with the inlet end of the vapor-liquid separator 6, the outlet end of the liquid pipe 42 of the subcooler 4 is communicated with a first connecting pipe of the indoor unit part, and the E interface of the four-way valve 2 is communicated with a second connecting pipe of the indoor unit part.
As shown in fig. 2, as described in the background art, since the refrigerant passing through the gas pipe 41 of the subcooler 4 is directly returned to the compressor 1 in the two paths of the refrigerant exiting from the second end of the outdoor heat exchanger 3, only the refrigerant passing through the liquid pipe 42 of the subcooler 4 enters the indoor unit, resulting in less refrigerant flow entering the indoor unit and greater refrigerant flow loss, thereby affecting the refrigerating capacity and coefficient of performance of the refrigerating system.
In order to solve the above technical problems, an embodiment of the present invention provides an air conditioner, and referring to fig. 3, which is a schematic diagram of an internal structure of the air conditioner according to an embodiment of the present invention, that is, a schematic diagram of a refrigeration system corresponding to an outdoor unit, where the refrigeration system shown in fig. 3 includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a subcooler 4, an electronic expansion valve 5, and a vapor-liquid separator 6; a closed circulation channel is formed by connecting the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the subcooler 4, the electronic expansion valve 5 and the vapor-liquid separator 6 through pipelines, and a refrigerant flows in the circulation channel; the exhaust pipe of the compressor 1 is connected with the D interface of the four-way valve 2, the air suction pipe of the compressor 1 is connected with the outlet end of the vapor-liquid separator 6, the inlet end of the vapor-liquid separator 6 is connected with the S interface of the four-way valve 2, the C interface of the four-way valve 2 is connected with the first end of the outdoor heat exchanger 3, and the second end of the outdoor heat exchanger 3 is divided into two paths: one path is connected with the inlet end of the air pipe 41 of the subcooler 4 through the electronic expansion valve 5, the other path is connected with the inlet end of the liquid pipe 42 of the subcooler 4, the outlet end of the liquid pipe 42 of the subcooler 4 is communicated with a first connecting pipe of the indoor unit part, and an E interface of the four-way valve 2 is communicated with a second connecting pipe of the indoor unit part.
The electronic expansion valve 5 is used to regulate the flow of the refrigerant passing through the low pressure side of the subcooler 4, and the low pressure side of the subcooler 4 is a pipe section from the second end of the outdoor heat exchanger 3 (as a condenser) to the inlet end of the air pipe 41 of the subcooler 4 through the electronic expansion valve 5 and then to the outlet end of the air pipe 41 of the subcooler when the indoor unit is refrigerating.
Referring to fig. 3, in an embodiment of the present invention, the refrigeration system further includes a solenoid valve 7, a capillary tube 8, and a check valve 9, where the solenoid valve 7, the capillary tube 8, and the check valve 9 are connected in series to form a supercooling flow path of the vapor-liquid separator 6, the bottom of the vapor-liquid separator 6 is sequentially connected to an inlet end of an air pipe 41 of the subcooler 4 through the solenoid valve 7, the capillary tube 8, and the check valve 9 (i.e., through the supercooling flow path), and an outlet end of the air pipe 41 of the subcooler 4 is connected to an air suction pipe of the compressor 1.
The electromagnetic valve 7 is used for controlling the on-off state of the supercooling flow path, when the electromagnetic valve 7 is opened, the supercooling flow path is communicated, the liquid refrigerant at the bottom of the vapor-liquid separator 6 can enter the subcooler 4 through the supercooling flow path, when the electromagnetic valve 7 is closed, the supercooling flow path is disconnected, and the liquid refrigerant at the bottom of the vapor-liquid separator 6 cannot enter the subcooler 4 through the supercooling flow path; the capillary tube 8 is used for throttling and reducing the pressure of the refrigerant flowing through; the check valve 9 is in an open state, so as to prevent the bypass refrigerant from flowing back to the vapor-liquid separator 6 through the supercooling flow path when the pressure of the bypass where the air pipe 41 of the supercooler 4 is located is greater than the pressure of the supercooling flow path.
In the embodiment of the invention, the air conditioner further comprises a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is used for collecting the middle temperature of the outdoor heat exchanger 3 in real time, and the second temperature sensor is used for collecting the outlet temperature of the outdoor heat exchanger 3 in real time.
In the embodiment of the invention, the air conditioner further comprises a controller, wherein the controller is used for controlling each component in the air conditioner to work so that each component of the air conditioner runs to realize various functions of the air conditioner, and further, the controller is also used for being connected with the first temperature sensor and the second temperature sensor to receive data acquired by the first temperature sensor and the second temperature sensor, and the technical scheme provided by the embodiment of the invention is adopted for correspondingly controlling the refrigerating system of the air conditioner so as to solve the technical problems to be solved by the embodiment of the invention and realize the technical effects which can be achieved by the embodiment of the invention.
As one of the alternative embodiments, the controller is configured to:
Opening the electromagnetic valve when the refrigeration system starts a supercooling function;
judging whether the opening time of the electromagnetic valve reaches a preset target time or not;
When the opening time reaches the target time, acquiring actual supercooling degree according to the middle temperature and the outlet temperature of the outdoor heat exchanger, and judging whether the actual supercooling degree reaches a preset target supercooling degree or not;
And closing the electronic expansion valve when the actual supercooling degree reaches the target supercooling degree.
Referring to fig. 4, a working flow chart of a controller of an air conditioner according to an embodiment of the present invention is shown, and when the embodiment of the present invention is implemented, a specific working process of the controller is as follows: judging whether the refrigeration system starts a supercooling function (step S11 shown in fig. 4); if it is determined that the refrigeration system starts the supercooling function, the electromagnetic valve 7 is opened (step S12 shown in fig. 4) to communicate a supercooling flow path between the vapor-liquid separator 6 and the inlet end of the gas pipe 41 of the subcooler 4, so that the liquid refrigerant at the bottom of the vapor-liquid separator 6 can enter the gas pipe 41 of the subcooler 4 through the supercooling flow path (after being depressurized and cooled by the capillary tube 8) to exchange heat; after the electromagnetic valve 7 is opened, it is judged whether or not the opening time of the electromagnetic valve 7 reaches a preset target time (step S13 shown in fig. 4), for example, whether or not the opening time of the electromagnetic valve 7 is greater than or equal to the preset target time; if it is determined that the opening time of the electromagnetic valve 7 reaches a preset target time, for example, it is determined that the opening time of the electromagnetic valve 7 is greater than or equal to a preset target time, an actual supercooling degree is obtained from the intermediate temperature of the outdoor heat exchanger 3 (as a condenser) acquired in real time by the first temperature sensor and the outlet temperature of the outdoor heat exchanger 3 (as a condenser) acquired in real time by the second sensor (step S14 shown in fig. 4), and it is further determined whether the calculated actual supercooling degree reaches a preset target supercooling degree (step S15 shown in fig. 4), for example, it is determined whether the calculated actual supercooling degree is greater than or equal to a preset target supercooling degree; if it is determined that the calculated actual supercooling degree reaches the preset target supercooling degree, for example, if it is determined that the calculated actual supercooling degree is greater than or equal to the preset target supercooling degree, the electronic expansion valve 5 is closed (step S16 shown in fig. 4) to disconnect the branch where the gas pipe 41 of the subcooler 4 is located, so that the refrigerant exiting from the second end of the outdoor heat exchanger 3 does not flow into the branch where the gas pipe 41 of the subcooler 4 through the electronic expansion valve 5 any more, but flows into the inlet end of the liquid pipe 42 of the subcooler 4 all the more, and flows into the indoor unit part all the more through the outlet end of the liquid pipe 42 of the subcooler 4.
It will be understood that, as shown in connection with fig. 4, after determining whether the opening time of the electromagnetic valve 7 reaches the preset target time, if it is determined that the opening time of the electromagnetic valve 7 does not reach the preset target time, for example, it is determined that the opening time of the electromagnetic valve 7 is less than the preset target time, the process returns to step S13 to restart.
It should be noted that, when determining whether the refrigeration system needs to start the supercooling function, the controller may determine according to the actual supercooling degree obtained by real-time detection, and if it is determined that the actual supercooling degree is less than the target supercooling degree, the controller needs to start the supercooling function; otherwise, the supercooling function does not need to be started; for example, assuming a target subcooling level=6℃, and an actual subcooling level=4℃, the refrigeration system would need to activate the subcooling function.
The embodiment of the invention provides an air conditioner, which is characterized in that an electromagnetic valve, a capillary tube and a one-way valve are added on the basis of the existing refrigeration system using a subcooler, the bottom of a vapor-liquid separator is connected with the inlet end of an air pipe of the subcooler through the electromagnetic valve, the capillary tube and the one-way valve in sequence, the outlet end of the air pipe of the subcooler is connected with an air suction pipe of a compressor, when the refrigeration system is started with a subcooling function, the electromagnetic valve is opened, whether the opening time of the electromagnetic valve reaches a preset target time is judged, when the opening time reaches the target time, the actual subcooling degree is obtained according to the middle temperature and the outlet temperature of an outdoor heat exchanger, whether the actual subcooling degree reaches the preset target subcooling degree is judged, and when the actual subcooling degree reaches the target subcooling degree, an electronic expansion valve is closed. When the electromagnetic valve is controlled to be opened, the liquid refrigerant at the bottom of the vapor-liquid separator can be enabled to enter the air pipe of the subcooler to exchange heat after being depressurized and cooled by the capillary tube, so that part of the refrigerant flowing out of the second end of the outdoor heat exchanger and flowing into the branch where the air pipe of the subcooler is located through the electronic expansion valve (the flow rate of the refrigerant flowing out of the outdoor heat exchanger and flowing into the branch where the air pipe is located is reduced, and the reduced part is compensated by the refrigerant flowing out of the bottom of the vapor-liquid separator), so that the flow rate of the refrigerant flowing out of the outdoor heat exchanger and flowing into the branch where the liquid pipe is located is increased, and the flow rate of the refrigerant flowing into the indoor machine is correspondingly increased.
In addition, the embodiment of the invention can fully utilize the low-temperature liquid refrigerant at the bottom of the vapor-liquid separator, and can also improve the temperature of the gaseous refrigerant flowing back to the compressor, thereby reducing the energy consumption of the compressor.
As one of the alternative embodiments, the controller is further configured to:
and when the actual supercooling degree does not reach the target supercooling degree, opening the electronic expansion valve.
In connection with fig. 5, a working flow chart of a controller of an air conditioner according to another embodiment of the present invention is provided, and when the embodiment of the present invention is implemented, after determining whether the calculated actual supercooling degree reaches the preset target supercooling degree, if it is determined that the calculated actual supercooling degree does not reach the preset target supercooling degree, for example, if it is determined that the calculated actual supercooling degree is smaller than the preset target supercooling degree, the electronic expansion valve 5 is opened (step S17 in fig. 5) to connect the branch circuit where the air pipe 41 of the subcooler 4 is located, so that the refrigerant coming out from the second end of the outdoor heat exchanger 3 is split into two paths, and flows into the branch circuit where the air pipe 41 of the subcooler 4 is located and the branch circuit where the liquid pipe 42 of the subcooler 4 is located, respectively, and the refrigerant in the air pipe 41 of the subcooler 4 is evaporated due to the heat of the refrigerant in the liquid pipe 42, and becomes the refrigerant gas, and the supercooling agent in the liquid pipe 42 of the subcooler 4 is further reduced because the temperature of the supercooling agent is further reduced, thereby achieving the preset target supercooling degree.
It should be noted that, after the controller controls the electronic expansion valve 5 to open, the controller may adjust the opening of the electronic expansion valve 5 according to the actual refrigerant flow requirement, and the specific opening adjustment scheme is not limited in the embodiment of the present invention.
As one of the alternative embodiments, the controller is further configured to:
and when the refrigeration system does not start the supercooling function, the electronic expansion valve and the electromagnetic valve are closed.
Referring to fig. 6, a working flow chart of a controller of an air conditioner according to another embodiment of the present invention is shown, where, in the embodiment of the present invention, after determining whether the cooling system is started up to be supercooled, if it is determined that the cooling system is not started up to be supercooled, the controller closes the electronic expansion valve 5 and the electromagnetic valve 7 (step S18 shown in fig. 6) to disconnect a supercooling flow path between the vapor-liquid separator 6 and an inlet end of the air pipe 41 of the subcooler 4 and disconnect a branch where the air pipe 41 of the subcooler 4 is located.
As an alternative embodiment, as shown in fig. 3, the refrigeration system further includes a first stop valve 10, and the outlet end of the liquid pipe 42 of the subcooler 4 is connected to the first connection pipe of the indoor unit part through the first stop valve 10.
Specifically, in combination with the above embodiment, a first stop valve 10 is disposed between the outlet end of the liquid pipe 42 of the subcooler 4 and the first connection pipe of the indoor unit, and the first stop valve 10 is used for controlling the on-off state of the refrigerant flow path between the outlet end of the liquid pipe 42 of the subcooler 4 and the first connection pipe of the indoor unit; it will be appreciated that when the first shut-off valve 10 is open, the refrigerant flow path is in communication; otherwise, the refrigerant flow path is open.
As an alternative embodiment, as shown in fig. 3, the refrigeration system further includes a second stop valve 11, and the E-port of the four-way valve 2 is connected to the second connection pipe of the indoor unit through the second stop valve 11.
Specifically, in combination with the above embodiment, a second stop valve 11 is disposed between the E-port of the four-way valve 2 and the second connection pipe of the indoor unit, and the second stop valve 11 is used to control the on-off state of the refrigerant flow path between the E-port of the four-way valve 2 and the second connection pipe of the indoor unit; it will be appreciated that when the second shut-off valve 11 is open, the refrigerant flow path communicates; otherwise, the refrigerant flow path is open.
Referring to fig. 7, which is a flowchart of the overall operation of the controller of the air conditioner according to an embodiment of the present invention, the following steps are specifically performed by the controller after initializing the refrigeration system, with reference to all the above embodiments and fig. 7:
s21, judging whether to start a supercooling function; if yes, go to S221; if not, entering S222;
s221, opening an electromagnetic valve to communicate with a supercooling flow path of the vapor-liquid separator, and entering S23;
S222, closing the electronic expansion valve and the electromagnetic valve to disconnect a supercooling flow path of the vapor-liquid separator and a branch path of an air pipe of the supercooler, and returning to S21;
S23, judging whether the opening time of the electromagnetic valve (equivalent to the communication time of a supercooling flow path of the vapor-liquid separator) reaches a preset target time T, namely judging whether the opening time of the electromagnetic valve is more than or equal to T; if yes, enter S24; if not, returning to S21;
S24, calculating the actual supercooling degree according to the middle temperature and the outlet temperature of the condenser, and entering S25;
S25, judging whether the actual supercooling degree reaches a preset target supercooling degree, namely judging whether the actual supercooling degree is more than or equal to the target supercooling degree; if yes, go to S261; if not, go to S262;
s261, closing an electronic expansion valve to disconnect a branch where an air pipe of the subcooler is located, and returning to S21;
S262, opening the electronic expansion valve to be communicated with a branch where an air pipe of the subcooler is located, and returning to S21.
The embodiment of the present invention further provides a control method of an air conditioner, and referring to fig. 8, a flowchart of a control method of an air conditioner according to an embodiment of the present invention is shown, where the method is applicable to the air conditioner according to any one of the above embodiments, and the method is performed by the controller, and the method includes steps S101 to S104:
step S101, when the refrigeration system starts a supercooling function, the electromagnetic valve is opened;
Step S102, judging whether the opening time of the electromagnetic valve reaches a preset target time;
step S103, when the opening time reaches the target time, acquiring actual supercooling degree according to the middle temperature and the outlet temperature of the outdoor heat exchanger, and judging whether the actual supercooling degree reaches a preset target supercooling degree or not;
and step S104, closing the electronic expansion valve when the actual supercooling degree reaches the target supercooling degree.
In some embodiments, the method further comprises:
and when the actual supercooling degree does not reach the target supercooling degree, opening the electronic expansion valve.
In some embodiments, the method further comprises:
and when the refrigeration system does not start the supercooling function, the electronic expansion valve and the electromagnetic valve are closed.
In some embodiments, the refrigeration system further includes a first stop valve through which an outlet end of the liquid pipe of the subcooler is connected to a first connection pipe of the indoor unit part.
In some embodiments, the refrigeration system further comprises a second stop valve, and the E-port of the four-way valve is connected to a second connection pipe of the indoor unit part through the second stop valve.
It should be noted that, the control method of the air conditioner provided by the embodiment of the present invention can implement all the working flows of the air conditioner described in any embodiment, and the specific implementation and the implemented technical effects corresponding to the control method are respectively the same as those of the air conditioner described in the embodiment, and are not repeated herein.
In summary, the air conditioner and the control method of the air conditioner provided by the embodiment of the invention comprise a refrigerating system, wherein the refrigerating system comprises a closed circulating channel formed by connecting a compressor, a four-way valve, an outdoor heat exchanger, a subcooler, an electronic expansion valve and a vapor-liquid separator through pipelines, and a refrigerant flows in the circulating channel; the second end of the outdoor heat exchanger is divided into two paths: one path is connected with the inlet end of the air pipe of the subcooler through the electronic expansion valve, and the other path is connected with the inlet end of the liquid pipe of the subcooler; the refrigerating system further comprises an electromagnetic valve, a capillary tube and a one-way valve, wherein the bottom of the vapor-liquid separator is connected with the inlet end of an air pipe of the subcooler through the electromagnetic valve, the capillary tube and the one-way valve in sequence, and the outlet end of the air pipe of the subcooler is connected with an air suction pipe of the compressor; the air conditioner further includes: the first temperature sensor is used for collecting the middle temperature of the outdoor heat exchanger; the second temperature sensor is used for collecting the outlet temperature of the outdoor heat exchanger; a controller for: when the refrigeration system starts the supercooling function, the electromagnetic valve is opened; judging whether the opening time of the electromagnetic valve reaches a preset target time or not; when the opening time reaches the target time, acquiring the actual supercooling degree according to the middle temperature and the outlet temperature of the outdoor heat exchanger, and judging whether the actual supercooling degree reaches the preset target supercooling degree or not; and when the actual supercooling degree reaches the target supercooling degree, closing the electronic expansion valve. When the electromagnetic valve is controlled to be opened, liquid refrigerant at the bottom of the vapor-liquid separator can enter the air pipe of the subcooler to exchange heat after being depressurized and cooled by the capillary tube, so that part of refrigerant flowing into the branch circuit of the subcooler from the second end of the outdoor heat exchanger through the electronic expansion valve (the flow rate of the refrigerant flowing out of the outdoor heat exchanger and flowing into the branch circuit of the air pipe is reduced, and the reduced part is compensated by the refrigerant flowing out of the bottom of the vapor-liquid separator), the flow rate of the refrigerant flowing out of the outdoor heat exchanger and flowing into the branch circuit of the liquid pipe of the subcooler is increased, and the flow rate of the refrigerant flowing into the indoor unit is correspondingly increased. In addition, the embodiment of the invention can fully utilize the low-temperature liquid refrigerant at the bottom of the vapor-liquid separator, and can also improve the temperature of the gaseous refrigerant flowing back to the compressor, thereby reducing the energy consumption of the compressor.
The foregoing is merely illustrative of some embodiments of the invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the invention, and such modifications and variations should also be regarded as being within the scope of the invention.

Claims (10)

1. An air conditioner comprises a refrigerating system, wherein the refrigerating system comprises a closed circulating channel formed by connecting a compressor, a four-way valve, an outdoor heat exchanger, a subcooler, an electronic expansion valve and a vapor-liquid separator through pipelines, and a refrigerant flows in the circulating channel; the second end of the outdoor heat exchanger is divided into two paths: one path is connected with the inlet end of the air pipe of the subcooler through the electronic expansion valve, and the other path is connected with the inlet end of the liquid pipe of the subcooler; it is characterized in that the method comprises the steps of,
The refrigerating system further comprises an electromagnetic valve, a capillary tube and a one-way valve, wherein the bottom of the vapor-liquid separator is connected with the inlet end of the air pipe of the subcooler through the electromagnetic valve, the capillary tube and the one-way valve in sequence, and the outlet end of the air pipe of the subcooler is connected with the air suction pipe of the compressor;
The air conditioner further includes:
the first temperature sensor is used for collecting the middle temperature of the outdoor heat exchanger;
The second temperature sensor is used for collecting the outlet temperature of the outdoor heat exchanger;
A controller for:
Opening the electromagnetic valve when the refrigeration system starts a supercooling function;
judging whether the opening time of the electromagnetic valve reaches a preset target time or not;
When the opening time reaches the target time, acquiring actual supercooling degree according to the middle temperature and the outlet temperature of the outdoor heat exchanger, and judging whether the actual supercooling degree reaches a preset target supercooling degree or not;
And closing the electronic expansion valve when the actual supercooling degree reaches the target supercooling degree.
2. The air conditioner of claim 1, wherein the controller is further configured to:
and when the actual supercooling degree does not reach the target supercooling degree, opening the electronic expansion valve.
3. The air conditioner of claim 1, wherein the controller is further configured to:
and when the refrigeration system does not start the supercooling function, the electronic expansion valve and the electromagnetic valve are closed.
4. The air conditioner as set forth in claim 1, wherein the refrigerating system further includes a first shut-off valve, and an outlet end of the liquid pipe of the subcooler is connected to a first connection pipe of the indoor unit part through the first shut-off valve.
5. The air conditioner as set forth in claim 1, wherein said refrigerating system further comprises a second shut-off valve, and an E-port of said four-way valve is connected to a second connection pipe of the indoor unit part through said second shut-off valve.
6. A control method of an air conditioner, adapted to the air conditioner according to claim 1, the method being performed by the controller, the method comprising:
Opening the electromagnetic valve when the refrigeration system starts a supercooling function;
judging whether the opening time of the electromagnetic valve reaches a preset target time or not;
When the opening time reaches the target time, acquiring actual supercooling degree according to the middle temperature and the outlet temperature of the outdoor heat exchanger, and judging whether the actual supercooling degree reaches a preset target supercooling degree or not;
And closing the electronic expansion valve when the actual supercooling degree reaches the target supercooling degree.
7. The control method of an air conditioner as set forth in claim 6, wherein the method further comprises:
and when the actual supercooling degree does not reach the target supercooling degree, opening the electronic expansion valve.
8. The control method of an air conditioner as set forth in claim 6, wherein the method further comprises:
and when the refrigeration system does not start the supercooling function, the electronic expansion valve and the electromagnetic valve are closed.
9. The control method of an air conditioner as set forth in claim 6, wherein the refrigerating system further comprises a first shut-off valve through which an outlet end of the liquid pipe of the subcooler is connected to a first connection pipe of the indoor unit part.
10. The method of controlling an air conditioner as claimed in claim 6, wherein the refrigerating system further comprises a second shut-off valve, and the E-port of the four-way valve is connected to the second connection pipe of the indoor unit part through the second shut-off valve.
CN202410427736.0A 2024-04-09 2024-04-09 Air conditioner and control method thereof Pending CN118376019A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410427736.0A CN118376019A (en) 2024-04-09 2024-04-09 Air conditioner and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410427736.0A CN118376019A (en) 2024-04-09 2024-04-09 Air conditioner and control method thereof

Publications (1)

Publication Number Publication Date
CN118376019A true CN118376019A (en) 2024-07-23

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Family Applications (1)

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Country Status (1)

Country Link
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