CN114963299A - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
CN114963299A
CN114963299A CN202210763742.4A CN202210763742A CN114963299A CN 114963299 A CN114963299 A CN 114963299A CN 202210763742 A CN202210763742 A CN 202210763742A CN 114963299 A CN114963299 A CN 114963299A
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CN
China
Prior art keywords
compressor
frequency
heat exchanger
valve
refrigerant
Prior art date
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Granted
Application number
CN202210763742.4A
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Chinese (zh)
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CN114963299B (en
Inventor
刘腾
李本卫
张然
张绍良
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Hisense Air Conditioning Co Ltd
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Hisense Air Conditioning Co Ltd
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Publication date
Application filed by Hisense Air Conditioning Co Ltd filed Critical Hisense Air Conditioning Co Ltd
Priority to CN202210763742.4A priority Critical patent/CN114963299B/en
Publication of CN114963299A publication Critical patent/CN114963299A/en
Priority to PCT/CN2023/082473 priority patent/WO2024001316A1/en
Application granted granted Critical
Publication of CN114963299B publication Critical patent/CN114963299B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
    • 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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—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
    • 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
    • F25B41/40—Fluid line arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention provides an air conditioner. The air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger, a compressor, an electronic expansion valve, a four-way valve, a pipeline, a controller and a concentration sensor, wherein the concentration sensor is arranged indoors and connected with the controller; when the concentration of the refrigerant is not less than a preset first concentration threshold value and the indoor heat exchanger is a condenser, detecting the current frequency F0 of the compressor by the controller, if the current frequency F0 is greater than the target frequency F1, controlling the frequency of the compressor to be reduced to the target frequency F1 by the controller, driving the compressor to run at the target frequency F1, and controlling the four-way valve to change the direction to enable the indoor heat exchanger to be the condenser; if the current frequency F0 is less than the target frequency F1, the controller controls the four-way valve to reverse to make the indoor heat exchanger a condenser, controls the frequency of the compressor to be increased to the target frequency F1, and drives the compressor to operate at the target frequency F1. The air conditioner realizes the quick recovery of the refrigerant by adjusting the heating working condition to the refrigerating working condition and adjusting the compressor to the target frequency.

Description

Air conditioner
Technical Field
The invention relates to the technical field of household appliances, in particular to an air conditioner.
Background
With the wide use of air conditioners, the environmental requirements of users on air conditioners are also continuously improved. In the prior art, the air conditioner with the R290 refrigerant is widely used, and the R290 air conditioner has the characteristic of environmental protection and can avoid pollution to the environment. Since the R290 refrigerant itself has flammability, there is a certain risk of explosion when the R290 refrigerant leaks. In the related art, in order to reduce the explosion risk caused by the leakage of the R290 refrigerant, the design specification of the flammable refrigerant is based on gb.4706[1] 32-2012, and the special requirements of the safety heat pump, the air conditioner and the dehumidifier of the household and similar appliances are mainly as follows: prevent on the one hand that the air conditioner from dismantling in indoor environment, avoid making the refrigerant reveal in indoor environment because artificial dismantlement, on the other hand pastes the warning label near on the air conditioner or mounted position, reminds the indoor personnel to pay close attention to the harm that the refrigerant revealed, and these two aspects are the angle of preventing the refrigerant from revealing in the past term.
The two methods of the disassembly prevention design and the pasting of the warning label of the air conditioner have certain limitations, and for a complex installation environment, the leakage of R290 in the operation process of the air conditioner cannot be prevented by an early leakage prevention method.
The disassembly prevention design of the air conditioner can prevent the air conditioner from being disassembled for the second time indoors, the leakage of the R290 caused by the fact that the air conditioner is spliced again after being disassembled and is not tightly attached is prevented, but if the R290 leaks in the first installation, the R290 can not be effectively prevented by the measures. The warning label can only remind people who pay attention to the content of the warning label, and the effect on people who do not pay attention to the content of the warning label is very limited. Therefore, the effectiveness of the existing measures for preventing the leakage of the R290 has certain limitations, and the explosion risk caused by the leakage of the R290 cannot be effectively reduced.
Disclosure of Invention
The present invention solves at least one of the technical problems of the related art to some extent.
Therefore, the present application is directed to provide an air conditioner, which can rapidly recover a refrigerant of an indoor heat exchanger and reduce a diffusion rate of the refrigerant in an indoor space when the air conditioner is in a heating condition and the refrigerant leaks.
According to the air conditioner of the present application, the air conditioner includes:
an indoor heat exchanger;
an outdoor heat exchanger;
a compressor for compressing the gaseous refrigerant evaporated by absorbing heat;
an electronic expansion valve;
a four-way valve connected to the indoor heat exchanger, the outdoor heat exchanger, and the compressor;
the indoor heat exchanger, the outdoor heat exchanger, the compressor, the four-way valve and the electronic expansion valve are connected through the pipelines;
a controller connected to the compressor, the four-way valve, and the electronic expansion valve;
a concentration sensor provided indoors and connected to the controller;
when the concentration of the refrigerant is not less than the preset first concentration threshold,
when the indoor heat exchanger is a condenser, the controller detects the current frequency F0 of the compressor,
if the current frequency F0 is greater than the target frequency F1, the controller controls the frequency of the compressor to be reduced to the target frequency F1 and drives the compressor to run at the target frequency F1, and then controls the four-way valve to be reversed to enable the indoor heat exchanger to be a condenser; if the current frequency F0 is less than the target frequency F1, the controller controls the four-way valve to reverse to make the indoor heat exchanger a condenser, controls the frequency of the compressor to be increased to the target frequency F1, and drives the compressor to operate at the target frequency F1.
In some embodiments of the present application, if the real-time frequency F0 is greater than the target frequency F1, the controller controls the frequency of the compressor to decrease at the down-conversion rate V1 until the frequency of the compressor decreases to the target frequency F1; if the real-time frequency F0 is less than the target frequency F1, the controller controls the frequency of the compressor to increase at the increasing rate V2 until the frequency of the compressor increases to the target frequency F1; the ramp-up rate V2 is not greater than the ramp-down rate V1, where V1 and V2 are both in Hz/s.
In some embodiments of the present application, the concentration sensor includes a control unit, the control unit presets a first concentration threshold, when the concentration sensor detects that the concentration of an indoor refrigerant is not less than the first concentration threshold, the control unit sends a signal that the refrigerant leaks to the controller, and the controller receives the signal that the refrigerant leaks.
In some embodiments of the present application, the controller presets a first concentration threshold, the concentration sensor sends a signal of a refrigerant concentration in an indoor environment detected in real time to the controller, and when the concentration of an indoor refrigerant is not less than the first concentration threshold, the controller determines that a refrigerant leakage condition exists indoors.
In some embodiments of the present application, the air conditioner further includes a first solenoid valve and a first stop valve, the first solenoid valve is disposed on a pipeline between the electronic expansion valve and the indoor heat exchanger, the first stop valve is disposed on a pipeline between the first solenoid valve and the indoor heat exchanger, the first solenoid valve is configured to regulate and control a flow rate of a flowing medium in the pipeline where the first solenoid valve is located, and the first stop valve is configured to cut off and throttle the flowing medium in the pipeline where the first stop valve is located.
In some embodiments of the present application, the air conditioner further includes a four-way valve, the indoor heat exchanger and the outdoor heat exchanger are respectively connected to the compressor through the four-way valve, the four-way valve includes a first port, a second port, a third port and a fourth port, and the compressor includes a suction port connected to the first port and a discharge port connected to the third port;
when the indoor heat exchanger is used as an evaporator, the first valve port is connected with the second valve port, and the third valve port is connected with the fourth valve port;
when the indoor heat exchanger is used as a condenser, the first valve port is connected with the fourth valve port, and the second valve port is connected with the third valve port.
In some embodiments of this application, the air conditioner still includes second solenoid valve and second stop valve, the second solenoid valve locate the cross valve with on the pipeline of indoor heat exchanger, the second stop valve is located the second solenoid valve with on the pipeline between the indoor heat exchanger, the second solenoid valve is arranged in regulating and controlling its place pipeline flow medium's flow, the second stop valve is arranged in cutting off and throttling the flow medium in its place pipeline.
In some embodiments of the present application, the first solenoid valve and the second solenoid valve are each connected to the controller.
In some embodiments of the present application, the indoor heat exchanger includes a first communication port in cut-off communication with the first valve and a second communication port in communication with the second cut-off valve; the outdoor heat exchanger comprises a third communicating port and a fourth communicating port, the third communicating port is communicated with the electronic expansion valve, and the fourth communicating port is communicated with the four-way valve.
In some embodiments of the present application, the air conditioner further comprises a discharge sensor disposed on the line between the discharge port and the third port, the discharge sensor for measuring a discharge temperature of the compressor.
The air conditioner at least has the following beneficial effects:
the invention provides an air conditioner. The air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger, a compressor, an electronic expansion valve, a four-way valve, a pipeline, a controller and a concentration sensor, wherein the concentration sensor is arranged indoors and is connected with the controller; when the concentration of the refrigerant is not less than a preset first concentration threshold value and the indoor heat exchanger is a condenser, detecting the current frequency F0 of the compressor by the controller, if the current frequency F0 is greater than the target frequency F1, controlling the frequency of the compressor to be reduced to the target frequency F1 by the controller, driving the compressor to run at the target frequency F1, and controlling the four-way valve to change the direction to enable the indoor heat exchanger to be the condenser; if the current frequency F0 is less than the target frequency F1, the controller controls the four-way valve to reverse to make the indoor heat exchanger a condenser, controls the frequency of the compressor to be increased to the target frequency F1, and drives the compressor to operate at the target frequency F1. . The air conditioner realizes the quick recovery of the refrigerant by adjusting the heating working condition to the refrigerating working condition and adjusting the compressor to the target frequency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a system diagram illustrating a cooling condition of an air conditioner according to an embodiment of the present application;
FIG. 2 is a system diagram illustrating a heating mode of an air conditioner according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart of the frequency adjustment of the compressor in a cooling condition of the air conditioner according to the embodiment of the present application;
fig. 4 is a schematic flow chart of the frequency adjustment of the compressor in the heating operation condition of the air conditioner according to the embodiment of the present application;
fig. 5 is an external view of an air conditioning indoor unit of an air conditioner according to an embodiment of the present application;
in the above figures: 100. an air conditioner; 1. an indoor heat exchanger; 11. a first communication port; 12. a second communication port; 2. an outdoor heat exchanger; 21. a third communication port; 22. a fourth communication port; 3. a compressor; 31. an air suction port; 32. an exhaust port; 4. an electronic expansion valve; 51. a first solenoid valve; 52. a second solenoid valve; 61. a first shut-off valve; 62. a second stop valve; 7. a four-way valve; 71. a first valve port; 72. a second valve port; 73. a third valve port; 74. a fourth valve port; 8. an air-conditioning indoor unit; 81. an air outlet; 82. a first air deflector; 83. a second air deflector.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The air conditioner 100 includes a compressor 3, a condenser, an expansion valve, and an evaporator, and performs a cooling cycle or a heating cycle through the compressor 3, the condenser, the expansion valve, and the evaporator. The refrigeration cycle and the heating cycle comprise a compression process, a condensation process, an expansion process and an evaporation process, and cold or heat is provided for the indoor space through the heat absorption and release processes of the refrigerant, so that the temperature of the indoor space is adjusted.
The compressor 3 compresses a refrigerant gas into a high-temperature and high-pressure state, discharges the compressed refrigerant gas, and the discharged refrigerant gas flows into a condenser. The condenser condenses the compressed high-temperature and high-pressure gaseous refrigerant into a liquid refrigerant, and heat is released to the surrounding environment through the condensation process.
The liquid refrigerant flowing out of the condenser enters an expansion valve, which expands the liquid refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid refrigerant. The low-pressure liquid refrigerant flowing out of the expansion valve enters the evaporator, absorbs heat while flowing through the evaporator, and evaporates into low-temperature low-pressure refrigerant gas, and the refrigerant gas in the low-temperature low-pressure state returns to the compressor 3. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The air conditioner 100 includes an air conditioner indoor unit 8, an air conditioner outdoor unit, and an expansion valve, the air conditioner indoor unit 8 includes a compressor 3 and an outdoor heat exchanger 2, the air conditioner indoor unit 8 includes an indoor heat exchanger 1, and the expansion valve may be provided in the air conditioner indoor unit 8 or the air conditioner outdoor unit.
The indoor heat exchanger 1 and the outdoor heat exchanger 2 can function as a condenser or an evaporator. When the indoor heat exchanger 1 is used as a condenser, the air conditioner is used as a heater for a heating mode, and when the indoor heat exchanger 1 is used as an evaporator, the air conditioner is used as a cooler for a cooling mode.
Hereinafter, embodiments of the present application will be described in detail with reference to fig. 1 to 5.
Referring to fig. 1 and 2, the air conditioner of the present application includes an indoor heat exchanger 1, an outdoor heat exchanger 2, a compressor 3, an expansion valve, and a pipe through which a refrigerant flows. The indoor heat exchanger 1 and the outdoor heat exchanger 2 are both communicated with the compressor 3. The expansion valve is an electronic expansion valve 4, and the electronic expansion valve 4 is connected between the indoor heat exchanger 1 and the outdoor heat exchanger 2 and can expand the liquid refrigerant that has undergone the condensation process into a low-pressure liquid refrigerant.
The air conditioner further comprises a first electromagnetic valve 51, a second electromagnetic valve 52, a first stop valve 61, a second stop valve 62 and a four-way valve 7, wherein the first electromagnetic valve 51 is arranged on a pipeline between the electronic expansion valve 4 and the indoor heat exchanger 1 and is used for regulating and controlling the flow of a flowing medium in the pipeline where the first electromagnetic valve is arranged, the first stop valve 61 is arranged on the pipeline between the first electromagnetic valve 51 and the indoor heat exchanger 1, and the first stop valve 61 can cut off and throttle the medium in the pipeline where the first stop valve is arranged.
The air conditioner further comprises a four-way valve 7, the indoor heat exchanger 1 and the outdoor heat exchanger 2 are connected with the compressor 3 through the four-way valve 7, a second electromagnetic valve 52 is arranged on a pipeline between the four-way valve 7 and the indoor heat exchanger 1 and used for regulating and controlling the flow of flowing media in the pipeline where the second electromagnetic valve is located, a second stop valve 62 is arranged between the second electromagnetic valve 52 and the indoor heat exchanger 1, and the second stop valve 62 can cut off and throttle the media in the pipeline where the second stop valve 62 is located.
The air conditioner further includes a controller connected to the first solenoid valve 51, the second solenoid valve 52, and the electronic expansion valve 4.
The compressor 3 includes a suction port 31 and an exhaust port 32, and the refrigerant that has absorbed heat and evaporated enters the compressor 3 through the suction port 31, and the compressor 3 compresses the gaseous refrigerant into a high-temperature and high-pressure state and then discharges the compressed gaseous refrigerant through the exhaust port 32. The air conditioner further includes an exhaust gas sensor provided on a line between the exhaust port 32 of the compressor 3 and the third port of the four-way valve, for measuring the exhaust temperature of the compressor 3.
The indoor heat exchanger and the outdoor heat exchanger are respectively connected with the compressor through a four-way valve, the four-way valve 7 comprises a first valve port 71, a second valve port 72, a third valve port 73 and a fourth valve port 74, wherein the suction port 31 of the compressor 3 is fixedly connected with the first valve port 71, and the exhaust port 32 of the compressor 3 is fixedly connected with the third valve port 73. When the air conditioner is in a cooling condition, the first valve port 71 is connected with the second valve port 72, and the third valve port 73 is connected with the fourth valve port 74. When the air conditioner is in a heating condition, the first port 71 is connected to the fourth port 74, and the second port 72 is connected to the third port 73.
The air conditioner further comprises a concentration sensor which can detect the concentration of the flammable refrigerant and is arranged at a position where the refrigerant of the indoor unit 8 of the air conditioner is easy to leak. The controller is connected with the concentration sensor and can receive signals transmitted by the concentration sensor.
In the air conditioner of the present application, the refrigerant may be R290 or another refrigerant having combustibility.
In some embodiments, a control unit of the concentration sensor presets a first concentration threshold, when the concentration sensor detects that the concentration of the indoor refrigerant reaches an upper limit value of the first concentration threshold, the control unit of the concentration sensor judges that the refrigerant leaks indoors, the control unit of the concentration sensor sends a signal to a controller, and the controller receives the signal that the refrigerant leaks.
In other embodiments, the control unit of the concentration sensor does not preset the first concentration threshold, the controller preset the first concentration threshold, the concentration sensor sends a signal of the refrigerant concentration in the indoor environment detected in real time to the controller, and the controller determines whether the refrigerant leakage condition exists indoors. When the concentration of the refrigerant reaches a first concentration threshold value, the controller judges that the refrigerant leaks in the room.
In some embodiments, the preset first concentration threshold is not greater than a refrigerant concentration value of an indoor environment which is not exploded, the refrigerant concentration value of the indoor environment which is not exploded can be obtained through an experimental result or by inquiring the prior art, the preset first concentration threshold is not greater than the refrigerant concentration value of the indoor environment which is not exploded, which is beneficial for an air conditioner to detect that an alarm is given and a refrigerant recovery mode is triggered when the refrigerant concentration reaches a lower level, so that the possibility of explosion accidents caused by refrigerant leakage is reduced, and the explosion risk caused by refrigerant leakage is further reduced.
Referring to fig. 1 and 2, in some embodiments of the present application, the indoor heat exchanger 1 includes a first communication port 11 and a second communication port 12, the first communication port 11 communicates with a first shut-off valve 61, and the second communication port 12 communicates with a second shut-off valve 62. The outdoor heat exchanger 2 includes a third communication port 21 and a fourth communication port 22, the third communication port 21 communicates with the electronic expansion valve 4, and the fourth communication port 22 communicates with the four-way valve 7.
In some embodiments of the present application, the air conditioner includes a cooling condition and a heating condition. Under the refrigeration working condition, the indoor heat exchanger 1 is an evaporator, the outdoor heat exchanger 2 is a condenser, and at the moment, the compressor 3 compresses the gaseous refrigerant into a high-temperature high-pressure state and discharges the compressed refrigerant gas from the outlet of the compressor 3. The refrigerant gas enters the fourth communication port 22 of the outdoor heat exchanger 2 (condenser) through the four-way valve 7, is condensed in the outdoor heat exchanger 2 (condenser), and releases heat to the surrounding environment through the condensation process. The refrigerant gas is changed into a liquid refrigerant through a condensation process, the liquid refrigerant flows out of the third communication port 21 of the outdoor heat exchanger 2 (condenser) and enters the electronic expansion valve 4, and the electronic expansion valve 4 expands the liquid refrigerant in a high-pressure state into a low-pressure liquid refrigerant. The liquid refrigerant flowing out of the electronic expansion valve 4 passes through the first solenoid valve 51 and the first shutoff valve 61 in this order, and then flows into the first communication port 11 of the indoor heat exchanger 1 (evaporator). When the refrigerant flows through the indoor heat exchanger 1 (evaporator), the refrigerant absorbs heat and becomes refrigerant gas with low temperature and low pressure, the refrigerant gas flows out from the second communication port 12 of the indoor heat exchanger 1 (evaporator), and enters the air suction port 31 of the compressor 3 through the second stop valve 62, the second electromagnetic valve 52 and the four-way valve 7 in sequence, the compressor 3 compresses the refrigerant gas with low temperature and low pressure again to make the refrigerant gas with high temperature and high pressure, the refrigerant gas with high temperature and high pressure flows out from the exhaust port 32 of the compressor 3, and then enters the fourth communication port 22 of the condenser, and enters the condensation process again. In this process, the heat absorption of the indoor heat exchanger 1 to the indoor environment and the heat release of the outdoor heat exchanger 2 to the outdoor environment are realized, and the supply of the cold energy to the indoor environment and the reduction of the indoor temperature are realized by consuming the electric energy supplied to the compressor 3.
In the heating condition, the indoor heat exchanger 1 is an evaporator, the outdoor heat exchanger 2 is a condenser, and at this time, the compressor 3 compresses the gaseous refrigerant into a high-temperature high-pressure state and discharges the compressed refrigerant gas from the outlet of the compressor 3. The refrigerant gas passes through the four-way valve 7, and sequentially passes through the second solenoid valve 52 and the second shutoff valve 62 to enter the second communication port 12 of the indoor heat exchanger 1 (condenser). The high-temperature and high-pressure refrigerant gas is condensed in the indoor heat exchanger 1 (condenser), and the heat of the refrigerant is released to the indoor environment, so that the indoor temperature is increased, and the purpose of heating is achieved. The refrigerant gas is changed into a liquid refrigerant through a condensation process, and the liquid refrigerant flows into the electronic expansion valve 4 from the first communication port 11 of the indoor heat exchanger 1 (condenser) through the first stop valve 61 and the first solenoid valve 51 in sequence. The electronic expansion valve 4 expands the liquid refrigerant in a high-pressure state into a low-pressure liquid refrigerant. The liquid refrigerant flowing out of the electronic expansion valve 4 flows into the third communication port 21 of the outdoor heat exchanger 2 (evaporator). The low-pressure liquid refrigerant is evaporated in the outdoor heat exchanger 2 (evaporator) to absorb heat of the outdoor environment and is evaporated into low-temperature and low-pressure refrigerant gas, the refrigerant gas flows out of the outdoor heat exchanger 2 (evaporator) and enters the air suction port 31 of the compressor 3 through the four-way valve 7, the compressor 3 compresses the low-temperature and low-pressure refrigerant gas into the high-temperature and high-pressure refrigerant gas again, the high-temperature and high-pressure refrigerant gas is condensed in the indoor heat exchanger 1 again, and the process is repeated, so that the outdoor heat is transferred to the indoor environment through the electric energy consumption of the compressor 3, and the temperature of the indoor environment is increased.
Referring to fig. 3, in the operation process of the air conditioner, when the controller receives a signal that the concentration of the refrigerant sent by the concentration sensor leaks, or when the controller judges that the concentration of the refrigerant is not less than a preset first concentration threshold value, the controller controls the air conditioner to enter a refrigerant recovery mode. The controller judges the working condition of the air conditioner and carries out different refrigerant recovery modes according to the current working condition of the air conditioner.
The controller presets the frequency F1 of the compressor 3 as a target frequency of the refrigerant recovery mode of the air conditioner.
When the indoor heat exchanger is an evaporator and the working condition of the air conditioner is a refrigeration working condition, the controller detects the current frequency F0 of the compressor 3 and judges whether the current frequency F0 reaches the upper limit value of the target frequency F1.
If the current frequency F0 is greater than the target frequency F1, the controller controls the frequency of the compressor 3 to decrease until the frequency of the compressor 3 decreases to the target frequency F1, and then controls the compressor to maintain the target frequency F1.
If the current frequency F0 is equal to the target frequency F1, the controller controls the compressor to maintain the target frequency F1 to operate.
If the current frequency F0 is less than the target frequency F1, the controller controls the frequency of the compressor 3 to increase until the frequency of the compressor 3 increases to the target frequency F1, and then controls the compressor to maintain the target frequency F1.
Specifically, on the one hand, if the current frequency F0 is greater than the target frequency F1, the frequency of the compressor 3 is higher, the refrigerant leakage speed in the room is faster, the frequency of the compressor 3 needs to be quickly reduced to the target frequency F1, the refrigerant leakage speed in the room is reduced, and the refrigerant recovery mode is performed in the state of the target frequency F1, which is beneficial to quickly recovering the refrigerant to the outdoors, and further reduces the refrigerant leakage speed in the room.
On the other hand, if the current frequency F0 is less than the target frequency F1, the frequency of the compressor 3 is low, the refrigerant leakage speed is low, but the refrigerant recovery rate is affected by the low compressor frequency and is kept low, which is not beneficial to the refrigerant recovery of the indoor unit of the air conditioner. Since the rate of refrigerant recovery from the indoor unit 8 to the outdoor unit increases with the increase of the frequency of the compressor 3, when the current frequency F0 is lower than the target frequency F1, the controller controls the frequency of the compressor 3 to increase to the target frequency F1, so as to increase the rate of refrigerant recovery.
In some embodiments of the present application, if the current frequency F0 is greater than the target frequency F1, the controller controls the frequency of the compressor 3 to decrease the frequency at the down-conversion rate V1 until the frequency of the compressor 3 decreases to the target frequency F1.
In some embodiments of the present application, if the current frequency F0 is less than the target frequency F1, the controller controls the frequency of the compressor 3 to increase at the increasing rate V2 until the frequency of the compressor 3 increases to the target frequency F1.
In some embodiments of the present application, the up-rate V2 is not greater than the down-rate V1, i.e., the up-rate V2 ≦ the down-rate V1. Wherein the units of V1 and V2 are Hz/s.
It should be noted that the frequency of the compressor 3 has an influence on the refrigerant recovery speed, and when the frequency of the compressor 3 is higher, the more the compressor 3 performs work in the same time, the more the low-temperature and low-pressure refrigerant gas entering the compressor 3 is rapidly compressed into the high-temperature and high-pressure refrigerant gas, so that the high-temperature and high-pressure refrigerant gas is rapidly sent to the outdoor heat exchanger 2, and the refrigerant is recovered faster. However, as the frequency of the compressor 3 increases, the pressure of the refrigerant in the pipe line increases, which increases the leakage rate of the refrigerant remaining in the indoor heat exchanger 1.
When the frequency of the compressor 3 is lower, the work of the compressor 3 is less in the same time, and the low-temperature and low-pressure refrigerant gas entering the compressor 3 is compressed into the high-temperature and high-pressure refrigerant gas at a low speed, so that the high-temperature and high-pressure refrigerant gas is slowly sent to the outdoor heat exchanger 2, and the refrigerant recovery speed is low. However, as the frequency of the compressor 3 is decreased, the pressure of the refrigerant in the pipe line is decreased, and thus the leakage speed of the refrigerant remaining in the indoor heat exchanger 1 is decreased.
If the current frequency F0 is less than the target frequency F1, the controller controls the frequency of the compressor 3 to be increased at an increasing rate V2, wherein the increasing rate V2 is less than or equal to a decreasing rate V1, and the compressor can be controlled to slowly increase the frequency. Specifically, since the leakage rate of the refrigerant is increased along with the increase of the frequency of the compressor 3, the frequency increasing rate V2 of the compressor 3 is smaller, so that the frequency of the compressor 3 is increased more slowly, the leakage amount of the refrigerant in the process of increasing the frequency of the compressor 3 is reduced, and the leakage condition of the refrigerant is reduced.
If the current frequency F0 is greater than the target frequency F1, the controller controls the frequency of the compressor 3 to perform down-conversion at the down-conversion rate V1, and the up-conversion rate V2 is less than or equal to the down-conversion rate V1, so that the compressor can be controlled to perform down-conversion quickly. Specifically, since the refrigerant leakage rate is reduced along with the reduction of the frequency of the compressor 3, and the frequency reduction rate V1 is high, the frequency of the compressor 3 can be rapidly reduced, so that the refrigerant leakage amount in the process of reducing the frequency of the compressor 3 is reduced, and the refrigerant leakage condition is reduced.
When the concentration of the refrigerant is not less than the preset first concentration threshold value, the refrigerant leakage condition exists indoors, the refrigerant of the indoor air conditioner unit 8 is leaked and diffused into the air, and in order to reduce the continuous leakage amount of the refrigerant of the indoor air conditioner unit 8, the controller controls the refrigerant of the indoor air conditioner unit 8 to flow through the pipeline and be recycled to the outdoor air conditioner unit.
When the controller receives a refrigerant leakage signal or the controller determines that a refrigerant leakage condition exists, in order to reduce the extent of continuous refrigerant leakage in the indoor environment, the refrigerant in the indoor unit 8 of the air conditioner needs to be recovered to the outdoor unit of the air conditioner as soon as possible, that is, the refrigerant in the indoor heat exchanger 1 flows through the pipeline provided with the second stop valve 62 and the second electromagnetic valve 52 to reach the suction port 31 of the compressor 3, the compressor 3 compresses the indoor refrigerant into high-temperature and high-pressure refrigerant gas, and then the refrigerant gas enters the outdoor heat exchanger 2 from the exhaust port 32 of the compressor 3, so that the refrigerant quantity of the indoor heat exchanger 1 is gradually reduced, thereby realizing the recovery of the refrigerant in the indoor heat exchanger 1 and reducing the leakage extent of the refrigerant in the indoor environment.
In some embodiments of the present application, the frequency F1 is a target frequency in the refrigerant recovery mode, and when the compressor 3 operates at the frequency F1, the refrigerant can be recovered at a faster speed, and the pressure of the pipeline is kept appropriate to prevent the residual refrigerant of the indoor heat exchanger 1 from leaking into the room quickly. The frequency F1 can be measured according to experimental results, or can be calculated according to simulation experiments or theories.
In the prior art, when a refrigerant leaks, the air conditioner is usually stopped immediately, the compressor 3 of the air conditioner is not in the optimal stop state due to the mode, the compressor 3 is damaged, and the service life of the air conditioning system is shortened.
In some embodiments of the present application, when the current frequency F0 of the compressor 3 is greater than the target frequency F1, the current frequency F0 of the compressor 3 is divided into at least two different sections, each section corresponds to a different deceleration frequency V1, the controller determines the section in which the current frequency F0 is located, and then obtains the corresponding deceleration frequency V1, so that the frequency of the compressor 3 can be quickly adjusted to the target frequency F1.
In some embodiments of the present application, when the current frequency F0 of the compressor 3 is less than the target frequency F1, the current frequency F0 of the compressor 3 is divided into at least two different sections, each section corresponds to a different ramp-up frequency V2, the controller determines the section in which the current frequency F0 is located, and then obtains the corresponding ramp-up frequency V2, so that the frequency of the compressor 3 can be quickly adjusted to the target frequency F1.
Referring to fig. 4, in the operation process of the air conditioner, when the concentration of the refrigerant is not less than the preset first concentration threshold, the controller receives a refrigerant concentration leakage signal or the controller determines that the refrigerant leaks indoors, and if the working condition of the air conditioner is a heating working condition, the controller detects the current frequency F0 of the compressor 3 and determines whether the current frequency F0 reaches the magnitude relation of the target frequency F1. If the current frequency F0 is greater than the target frequency F1, the controller controls the frequency of the compressor 3 to be reduced to the target frequency F1, and then controls the four-way valve to change direction to enable the indoor heat exchanger to be a condenser and to be adjusted to a refrigeration working condition.
If the current frequency F0 is equal to the target frequency F1, the controller controls the frequency of the compressor to maintain the operation of the target frequency F1.
If the current frequency F0 is less than the target frequency F1, the controller controls the four-way valve to change direction so that the indoor heat exchanger is a condenser and is adjusted to be in a refrigeration working condition, and the frequency of the compressor 3 is controlled to be increased to the target frequency F1.
Specifically, on the one hand, if the current frequency F0 is greater than the target frequency F1, the frequency of the compressor 3 is higher, the refrigerant leakage speed in the room is faster, the frequency of the compressor 3 needs to be quickly reduced to the target frequency F1, the refrigerant leakage speed in the room is reduced, and the refrigerant recovery mode is performed in the state of the target frequency F1, which is beneficial to quickly recovering the refrigerant to the outdoors, and further reduces the refrigerant leakage speed in the room.
On the other hand, if the current frequency F0 is less than the target frequency F1, at this time, the frequency of the compressor 3 is low, and since the rate of recovering the refrigerant from the air conditioning indoor unit 8 to the air conditioning outdoor unit increases with the increase of the frequency of the compressor 3, when the current frequency F0 reaches the lower limit value of the target frequency F1, the controller controls the frequency of the compressor 3 to increase to the target frequency F1, so as to increase the rate of recovering the refrigerant.
It should be noted that, since the air conditioner is in the heating operation mode, the second communication port 12 of the indoor heat exchanger 1 is communicated with the exhaust port 32 of the compressor 3, the compressor 3 discharges high-temperature and high-pressure gas to the indoor heat exchanger 1, the indoor heat exchanger 1 serves as a condenser, and the high-temperature and high-pressure gas refrigerant is condensed and flows to the electronic expansion valve 4 from the first communication port 11. Therefore, the refrigerant of the indoor heat exchanger 1 is not directly connected to the suction port 31 of the compressor 3, and the refrigerant of the indoor heat exchanger 1 cannot be effectively extracted to the outdoor heat exchanger 2 by the compressor 3 in the heating operation, and thus the refrigerant recovery mode can be performed only in the cooling operation.
If the current frequency F0 is greater than the target frequency F1, the frequency of the compressor 3 is greater, and the four-way valve 7 cannot be directly turned to the refrigeration condition, and it is necessary to reduce the frequency of the compressor 3 to F1 and then switch the four-way valve 7 to the refrigeration condition. When the air conditioner is in a cooling operation mode, the indoor heat exchanger 1 serves as an evaporator, the second communication port 12 of the indoor heat exchanger 1 is communicated with the suction port 31 of the compressor 3, when the compressor 3 operates at the target frequency F1, the compressor 3 can compress the gas of the indoor heat exchanger 1 entering from the suction port 31 into high-temperature and high-pressure gas and discharge the high-temperature and high-pressure gas to the outdoor heat exchanger 2, the outdoor heat exchanger 2 serves as a condenser, the high-temperature and high-pressure gas refrigerant is condensed into liquid refrigerant, and therefore the refrigerant is recovered from the indoor heat exchanger 1 to the outdoor heat exchanger 2.
If the current frequency F0 is less than the target frequency F1, the frequency of the compressor 3 is small at this moment, the controller can regulate and control the four-way valve 7 to directly turn to the refrigeration working condition, the refrigerant is recycled under the refrigeration working condition, the frequency of the compressor 3 does not need to be changed firstly, and then the refrigerant is recycled, so that the recycling efficiency of the refrigerant is improved, and the indoor leakage speed of the refrigerant is reduced.
In some embodiments of the present application, if the current frequency F0 is greater than the target frequency F1, the controller controls the compressor 3 to decrease the down conversion rate V1 to the target frequency F1, and then controls the four-way valve 7 to change the direction to the cooling condition.
In some embodiments of the present application, if the current frequency F0 is lower than the target frequency F1, the controller controls the four-way valve 7 to change the direction to the cooling condition, and then adjusts the current frequency to the target frequency F1 at the ramp-up rate V2.
In some embodiments of the present application, the up-rate V2 is not greater than the down-rate V1, i.e., the up-rate V2 ≦ the down-rate V1. Wherein the units of V1 and V2 are Hz/s.
The frequency of the compressor 3 has an influence on the recovery speed of the refrigerant, and when the frequency of the compressor 3 is higher, the more the compressor 3 does work in the same time, a large amount of low-temperature and low-pressure refrigerant gas entering the compressor 3 is rapidly compressed into high-temperature and high-pressure refrigerant gas, so that the high-temperature and high-pressure refrigerant gas is rapidly sent to the outdoor heat exchanger 2, and the refrigerant is recovered faster. However, as the frequency of the compressor 3 increases, the pressure of the refrigerant in the pipe line increases, which increases the leakage rate of the refrigerant remaining in the indoor heat exchanger 1.
When the frequency of the compressor 3 is lower, the work of the compressor 3 is less in the same time, and the low-temperature and low-pressure refrigerant gas entering the compressor 3 is compressed into the high-temperature and high-pressure refrigerant gas at a low speed, so that the high-temperature and high-pressure refrigerant gas is slowly sent to the outdoor heat exchanger 2, and the refrigerant recovery speed is low. However, as the frequency of the compressor 3 is decreased, the pressure of the refrigerant in the pipe line is decreased, and thus the leakage speed of the refrigerant remaining in the indoor heat exchanger 1 is decreased.
If the current frequency F0 is less than the target frequency F1, the controller controls the frequency of the compressor 3 to increase at the frequency increasing rate V2, the frequency increasing rate V2 is less than or equal to the frequency decreasing rate V1, and since the leakage rate of the refrigerant increases with the increase of the frequency of the compressor 3, the frequency increasing rate V2 of the compressor 3 is lower, so that the frequency of the compressor 3 increases more slowly, the leakage amount of the refrigerant in the process of increasing the frequency of the compressor 3 is reduced, and the leakage condition of the refrigerant is reduced.
If the current frequency F0 is greater than the target frequency F1, the controller controls the frequency of the compressor 3 to decrease the frequency at the frequency decreasing rate V1, the frequency increasing rate V2 is less than or equal to the frequency decreasing rate V1, and since the refrigerant leakage rate decreases with the decrease in the frequency of the compressor 3, the frequency decreasing rate V1 is greater, the frequency of the compressor 3 can be decreased rapidly, so that the refrigerant leakage amount in the process of decreasing the frequency of the compressor 3 is reduced, and the refrigerant leakage condition is reduced.
Because the refrigerant leakage rate of the compressor 3 is increased along with the increase of the frequency of the compressor 3, the frequency increasing rate of the compressor 3 is smaller, and the refrigerant leakage amount of the compressor 3 in the process of increasing the frequency can be reduced. Since the rate of refrigerant recovery from the indoor unit 8 to the outdoor unit increases with the increase of the frequency of the compressor 3, the controller controls the frequency of the compressor 3 to increase to the target frequency F1 because the current frequency F0 is less than the target frequency F1, so as to increase the rate of refrigerant recovery.
In some embodiments of the present application, when the current frequency F0 is greater than the target frequency F1, the current frequency F0 of the compressor 3 is divided into at least two different sections, each section corresponds to a different deceleration frequency V1, the controller determines the section where the current frequency F0 is located, and then obtains the corresponding deceleration frequency V1, so that the frequency of the compressor 3 can be quickly adjusted to the target frequency F1.
In some embodiments of the present application, when the current frequency F0 is smaller than the target frequency F1, the current frequency F0 of the compressor 3 is divided into at least two different sections, each section corresponds to a different ramp-up frequency V2, the controller determines the section in which the current frequency F0 is located, and then obtains the corresponding ramp-up frequency V2, so that the frequency of the compressor 3 can be quickly adjusted to the target frequency F1.
In the operation process of the air conditioner, when the air conditioner is in the refrigeration working condition and the compressor 3 stably operates at the target frequency F1, the controller adjusts the first electromagnetic valve 51 to the closed state, so that the refrigerant of the outdoor unit of the air conditioner cannot flow to the indoor unit 8 of the air conditioner through the pipeline where the first electromagnetic valve 51 is located, and the source of the refrigerant of the indoor unit 8 of the air conditioner is cut off.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. An air conditioner, comprising:
an indoor heat exchanger;
an outdoor heat exchanger;
a compressor for compressing the gaseous refrigerant evaporated by absorbing heat;
an electronic expansion valve;
a four-way valve connected to the indoor heat exchanger, the outdoor heat exchanger, and the compressor;
the indoor heat exchanger, the outdoor heat exchanger, the compressor, the four-way valve and the electronic expansion valve are connected through the pipelines;
a controller connected to the compressor, the four-way valve, and the electronic expansion valve;
a concentration sensor provided indoors and connected to the controller;
when the concentration of the refrigerant is not less than the preset first concentration threshold,
when the indoor heat exchanger is a condenser, the controller detects the current frequency F0 of the compressor,
if the current frequency F0 is greater than the target frequency F1, the controller controls the frequency of the compressor to be reduced to the target frequency F1 and drives the compressor to run at the target frequency F1, and then controls the four-way valve to be reversed to enable the indoor heat exchanger to be a condenser; if the current frequency F0 is less than the target frequency F1, the controller controls the four-way valve to reverse to make the indoor heat exchanger a condenser, controls the frequency of the compressor to be increased to the target frequency F1, and drives the compressor to operate at the target frequency F1.
2. The air conditioner of claim 1, wherein if the real-time frequency F0 is greater than the target frequency F1, the controller controls the frequency of the compressor to be decreased at a down-conversion rate V1 until the frequency of the compressor is decreased to the target frequency F1; if the real-time frequency F0 is less than the target frequency F1, the controller controls the frequency of the compressor to increase at the increasing rate V2 until the frequency of the compressor increases to the target frequency F1; the ramp-up rate V2 is not greater than the ramp-down rate V1, where V1 and V2 are both in Hz/s.
3. The air conditioner according to claim 1, wherein the concentration sensor comprises a control unit, the control unit presets a first concentration threshold, when the concentration sensor detects that the concentration of the indoor refrigerant is not less than the first concentration threshold, the control unit sends a refrigerant leakage signal to the controller, and the controller receives the refrigerant leakage signal.
4. The air conditioner according to claim 1, wherein the controller presets a first concentration threshold, the concentration sensor sends a signal of a refrigerant concentration in the indoor environment detected in real time to the controller, and when the concentration of the indoor refrigerant is not less than the first concentration threshold, the controller determines that a refrigerant leakage condition exists in the room.
5. The air conditioner according to claim 1 or 2, further comprising a first solenoid valve provided in the pipe between the electronic expansion valve and the indoor heat exchanger, and a first shutoff valve provided in the pipe between the first solenoid valve and the indoor heat exchanger, wherein the first solenoid valve is configured to regulate a flow rate of the flowing medium in the pipe in which the first solenoid valve is provided, and the first shutoff valve is configured to shut off and throttle the flowing medium in the pipe in which the first shutoff valve is provided.
6. The air conditioner according to claim 5, further comprising a four-way valve, wherein the indoor heat exchanger and the outdoor heat exchanger are connected to the compressor through the four-way valve, respectively, the four-way valve comprising a first port, a second port, a third port, and a fourth port, and the compressor comprises a suction port connected to the first port and a discharge port connected to the third port;
when the indoor heat exchanger is used as an evaporator, the first valve port is connected with the second valve port, and the third valve port is connected with the fourth valve port;
when the indoor heat exchanger is used as a condenser, the first valve port is connected with the fourth valve port, and the second valve port is connected with the third valve port.
7. The air conditioner according to claim 1 or 2, further comprising a second solenoid valve and a second shutoff valve, wherein the second solenoid valve is disposed on a pipeline between the four-way valve and the indoor heat exchanger, the second shutoff valve is disposed on a pipeline between the second solenoid valve and the indoor heat exchanger, the second solenoid valve is used for regulating and controlling a flow rate of a flowing medium in the pipeline where the second solenoid valve is located, and the second shutoff valve is used for cutting off and throttling the flowing medium in the pipeline where the second solenoid valve is located.
8. The air conditioner according to claim 1, wherein the first solenoid valve and the second solenoid valve are respectively connected to the controller.
9. The air conditioner according to claim 1, wherein the indoor heat exchanger includes a first communication port that is in communication with the first valve, and a second communication port that is in communication with the second shutoff valve; the outdoor heat exchanger comprises a third communicating port and a fourth communicating port, the third communicating port is communicated with the electronic expansion valve, and the fourth communicating port is communicated with the four-way valve.
10. The air conditioner of claim 1, further comprising a discharge sensor disposed on the conduit between the discharge port and the third port, the discharge sensor for measuring a discharge temperature of the compressor.
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CN114543259A (en) * 2022-03-08 2022-05-27 青岛海信日立空调系统有限公司 Air conditioner
CN115247859A (en) * 2022-06-30 2022-10-28 海信空调有限公司 Air conditioner

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CN115247859A (en) * 2022-06-30 2022-10-28 海信空调有限公司 Air conditioner
CN115247859B (en) * 2022-06-30 2023-10-27 海信空调有限公司 Air conditioner
WO2024001316A1 (en) * 2022-06-30 2024-01-04 海信空调有限公司 Air conditioner

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