CN114963299B - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
CN114963299B
CN114963299B CN202210763742.4A CN202210763742A CN114963299B CN 114963299 B CN114963299 B CN 114963299B CN 202210763742 A CN202210763742 A CN 202210763742A CN 114963299 B CN114963299 B CN 114963299B
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CN
China
Prior art keywords
frequency
valve
compressor
heat exchanger
refrigerant
Prior art date
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Active
Application number
CN202210763742.4A
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Chinese (zh)
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CN114963299A (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
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.)
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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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Classifications

    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The application 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, the controller detects the current frequency F0 of the compressor when the indoor heat exchanger is a condenser, 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 the four-way valve is controlled to change the direction so that the indoor heat exchanger is the condenser; if the current frequency F0 is smaller than the target frequency F1, the controller controls the four-way valve to change the direction so that the indoor heat exchanger is a condenser, controls the frequency of the compressor to rise to the target frequency F1, and drives the compressor to operate at the target frequency F1. The air conditioner realizes the rapid 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 application relates to the technical field of household appliances, in particular to an air conditioner.
Background
With the wide use of air conditioners, the environmental protection requirements of users on the air conditioners are also continuously improved. In the prior art, the R290 refrigerant air conditioner is widely used, and the R290 air conditioner has the characteristic of environmental protection, and can avoid polluting the environment. Because the R290 refrigerant has inflammability, when the R290 refrigerant leaks, a certain risk of explosion occurs. 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 according to the special requirements of the safety heat pump, the air conditioner and the dehumidifier of household and similar electric appliances in accordance with gb.4706[1].32-2012, the following two aspects are mainly included: on the one hand, the air conditioner is prevented from being dismounted in the indoor environment, the situation that the refrigerant leaks in the indoor environment due to manual dismounting is avoided, and on the other hand, a warning label is attached to the air conditioner or the vicinity of the mounting position, so that indoor personnel are reminded of paying attention to the harm of refrigerant leakage, and the two aspects are from the perspective of preventing the refrigerant leakage in the front stage.
The two methods of anti-disassembly design and warning labeling of the air conditioner have certain limitations, and R290 leakage in the running process of the air conditioner cannot be prevented by a previous anti-leakage method for complex installation environments.
The anti-disassembly design of the air conditioner can prevent the air conditioner from being disassembled for the second time indoors, and prevent R290 from leaking caused by the fact that the air conditioner is disassembled and spliced again and is not clung to the air conditioner, but if the R290 leaks when the air conditioner is installed for the first time, the R290 cannot be prevented from leaking effectively by the aid of the measures. The warning label can only remind people who pay attention to the content of the warning label, and has very limited effect on people who do not pay attention to the content. Therefore, the effectiveness of the existing measures for preventing the R290 from leaking has a certain limitation, and the explosion risk caused by the R290 leakage cannot be effectively reduced.
Disclosure of Invention
The present application solves at least one of the technical problems in the related art to a certain extent.
Therefore, the application aims to provide an air conditioner, which can quickly recover the refrigerant of the indoor heat exchanger and reduce the diffusion rate of the refrigerant in the indoor space when the air conditioner is in a heating working 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 the heat absorption;
an electronic expansion valve;
the four-way valve is connected with 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;
the controller is connected with 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 a preset first concentration threshold,
when the indoor heat exchanger is an evaporator, 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;
if the current frequency F0 is smaller than the target frequency F1, controlling the frequency of the compressor to rise to the target frequency F1, and driving the compressor to run at the target frequency F1;
and if the current frequency is equal to the target frequency F1, controlling the compressor to maintain the target frequency F1 to operate.
In some embodiments of the application, if the current frequency F0 is greater than the target frequency F1, the controller controls the frequency of the compressor to decrease at a frequency-decreasing rate V1 until the frequency of the compressor decreases to the target frequency F1; if the current frequency F0 is smaller than the target frequency F1, the controller controls the frequency of the compressor to rise at the rising frequency rate V2 until the frequency of the compressor rises to the target frequency F1; the up-conversion rate V2 is not greater than the down-conversion rate V1, wherein V1 and V2 are both in Hz/s.
In some embodiments of the present application, the concentration sensor includes a control unit, where the control unit presets a first concentration threshold, and 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 signal of refrigerant leakage to the controller, and the controller receives the signal of refrigerant leakage.
In some embodiments of the present application, the controller presets a first concentration threshold, the concentration sensor sends a signal of the concentration of the refrigerant in the indoor environment detected in real time to the controller, and when the concentration of the refrigerant in the indoor environment is not less than the first concentration threshold, the controller determines that the refrigerant leaks in the indoor environment.
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 used for regulating and controlling a flow rate of a flowing medium in a pipeline where the first solenoid valve is located, and the first stop valve is used for cutting off and throttling 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 connected to the compressor through the four-way valve, respectively, the four-way valve includes a first valve port, a second valve port, a third valve port, and a fourth valve port, and the compressor includes an air suction port connected to the first valve port and an air discharge port connected to the third valve 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 the present application, the air conditioner further includes a second electromagnetic valve and a second stop valve, the second electromagnetic valve is disposed on a pipeline between the four-way valve and the indoor heat exchanger, the second stop valve is disposed on a pipeline between the second electromagnetic valve and the indoor heat exchanger, the second electromagnetic valve is used for regulating and controlling a flow rate of a flowing medium in a pipeline where the second electromagnetic valve is located, and the second stop valve is used for cutting off and throttling the flowing medium in the pipeline where the second stop valve is located.
In some embodiments of the application, the first solenoid valve and the second solenoid valve are each connected to the controller.
In some embodiments of the application, the indoor heat exchanger comprises a first communication port and a second communication port, the first communication port being in shut-off communication with the first valve, the second communication port being in communication with the second shut-off valve; the outdoor heat exchanger comprises a third communication port and a fourth communication port, wherein the third communication port is communicated with the electronic expansion valve, and the fourth communication port is communicated with the four-way valve.
In some embodiments of the application, the air conditioner further comprises a discharge sensor on the line between the discharge port and the third valve port for measuring a discharge temperature of the compressor.
The air conditioner has at least the following beneficial effects:
the application 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, the controller detects the current frequency F0 of the compressor when the indoor heat exchanger is a condenser, 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 the four-way valve is controlled to change the direction so that the indoor heat exchanger is an evaporator; if the current frequency F0 is smaller than the target frequency F1, the controller controls the four-way valve to change the direction so that the indoor heat exchanger is an evaporator, controls the frequency of the compressor to rise to the target frequency F1, and drives the compressor to operate at the target frequency F1. The air conditioner realizes the rapid 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 application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a system schematic diagram of a cooling operation of an air conditioner according to an embodiment of the present application;
FIG. 2 is a system schematic diagram of a heating mode of an air conditioner according to an embodiment of the present application;
FIG. 3 is a flow chart of compressor frequency adjustment during a cooling condition of an air conditioner according to an embodiment of the present application;
FIG. 4 is a flow chart of compressor frequency adjustment during heating conditions of an air conditioner according to an embodiment of the present application;
fig. 5 is an external view of an air conditioner indoor unit of an air conditioner according to an embodiment of the present application;
in the above figures: 100. air-conditioning; 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 electromagnetic valve; 52. a second electromagnetic valve; 61. a first stop valve; 62. a second shut-off 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 conditioner indoor unit; 81. an air outlet; 82. a first air deflector; 83. and the second air deflector.
Detailed Description
The present application will be specifically described below by way of exemplary embodiments. It is to be understood that elements, structures, and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present application, it should 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 the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The air conditioner 100 includes a compressor 3, a condenser, an expansion valve, and an evaporator, and a refrigeration cycle or a heating cycle is performed through the compressor 3, the condenser, the expansion valve, and the evaporator. The refrigerating 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 regulated.
The compressor 3 compresses the refrigerant gas into a high-temperature and high-pressure state and discharges the compressed refrigerant gas, and the discharged refrigerant gas flows into the 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, and the expansion valve 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, and when the liquid refrigerant flows through the evaporator, the absorbed heat evaporates into a low-temperature low-pressure refrigerant gas, and the refrigerant gas in a low-temperature low-pressure state returns to the compressor 3. The evaporator may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. Throughout the cycle, the air conditioner may adjust the temperature of the indoor space.
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 be used 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 of a heating mode, and when the indoor heat exchanger 1 is used as an evaporator, the air conditioner is used as a cooler of 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 subjected to the supercooling 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 flowing media in the pipeline where the first electromagnetic valve is located, 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 media of the pipeline where the first stop valve 61 is located.
The air conditioner further comprises a four-way valve 7, the indoor heat exchanger 1 and the outdoor heat exchanger 2 are connected through the four-way valve 7 and the compressor 3, 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 two electromagnetic valves are 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 play a role of cutting off and throttling the media of the pipeline where the two electromagnetic valves are 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 an intake port 31 and an exhaust port 32, and the refrigerant having absorbed heat and undergone an evaporation process enters the compressor 3 through the intake 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 valve port of the four-way valve, the exhaust gas sensor being for measuring an exhaust gas 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 an air suction port 31 of the compressor 3 is fixedly connected with the first valve port 71, and an air discharge port 32 of the compressor 3 is fixedly connected with the third valve port 73. When the air conditioner is in a refrigerating 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 valve port 71 is connected with the fourth valve port 74, and the second valve port 72 is connected with the third valve port 73.
The air conditioner further comprises a concentration sensor, wherein the concentration sensor can detect the concentration of the combustible refrigerant, and is arranged at a position where the refrigerant of the air conditioner indoor unit 8 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 other flammable refrigerant.
In some embodiments, the control unit of the concentration sensor presets a first concentration threshold, when the concentration sensor detects that the concentration of the indoor refrigerant reaches the upper limit value of the first concentration threshold, the control unit of the concentration sensor judges that the indoor refrigerant leaks, the control unit of the concentration sensor sends a signal to the controller, and the controller receives the signal of refrigerant leakage.
In other embodiments, the control unit of the concentration sensor does not preset the first concentration threshold, the controller presets 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 judges whether the refrigerant leaks in the indoor environment. When the concentration of the refrigerant reaches a first concentration threshold, the controller judges that the refrigerant leaks in the room.
In some embodiments, the preset first concentration threshold value is not greater than a refrigerant concentration value of the indoor environment, the refrigerant concentration value of the indoor environment, which is not exploded, can be obtained through an experimental result or obtained through inquiring the prior art, and the preset first concentration threshold value is not greater than the refrigerant concentration value of the indoor environment, which is not exploded, so that the air conditioner can alarm and trigger a refrigerant recovery mode when the refrigerant concentration reaches a lower level, the possibility of explosion accidents caused by refrigerant leakage is reduced, and the explosion risks caused by the refrigerant leakage are 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 being in communication with the electronic expansion valve 4, the fourth communication port 22 being in communication with the four-way valve 7.
In some embodiments of the application, the air conditioner includes a cooling mode and a heating mode. During refrigeration working conditions, the indoor heat exchanger 1 is an evaporator, the outdoor heat exchanger 2 is a condenser, and at the moment, the compressor 3 compresses a gaseous refrigerant into a high-temperature and high-pressure state and discharges the compressed refrigerant gas from an 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 the condensation process, and the liquid refrigerant flows out from 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 flows 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). The liquid refrigerant flows through the refrigerant pipeline in the indoor heat exchanger 1 (evaporator), so that the refrigerant exchanges heat with the indoor environment, when the refrigerant flows through the indoor heat exchanger 1 (evaporator), the absorbed heat becomes low-temperature low-pressure refrigerant gas, the refrigerant gas flows out from the second communication port 12 of the indoor heat exchanger 1 (evaporator), sequentially passes through the second stop valve 62, the second electromagnetic valve 52 and the four-way valve 7 and enters the air suction port 31 of the compressor 3, the compressor 3 compresses the low-temperature low-pressure refrigerant gas again to become high-temperature high-pressure refrigerant gas, and the high-temperature high-pressure refrigerant gas flows out from the air discharge port 32 of the compressor 3 and enters the fourth communication port 22 of the condenser again to enter the condensation process. In this process, heat absorption of the indoor heat exchanger 1 to the indoor environment and heat release of the outdoor heat exchanger 2 to the outdoor environment are realized, and by consuming electric power supplied to the compressor 3, cooling capacity is supplied to the indoor environment, and indoor temperature reduction is realized.
During heating conditions, the indoor heat exchanger 1 is a condenser, the outdoor heat exchanger 2 is an evaporator, and at this time, the compressor 3 compresses the gaseous refrigerant into a high-temperature and 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, sequentially passes through the second electromagnetic valve 52 and the second stop valve 62, and enters 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 the 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 electromagnetic valve 51 in order. 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), absorbs heat of the outdoor environment, evaporates into low-temperature low-pressure refrigerant gas, flows out of the outdoor heat exchanger 2 (evaporator), enters the air suction port 31 of the compressor 3 through the four-way valve 7, the compressor 3 compresses the low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas again, and the high-temperature high-pressure refrigerant gas is condensed again through the indoor heat exchanger 1, so that outdoor heat is transferred to the indoor environment through 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 of the present application, when the controller receives a signal of leakage of the concentration of the refrigerant sent by the concentration sensor, or when the controller determines that the concentration of the refrigerant is not less than a preset first concentration threshold, 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, the working condition of the air conditioner is a refrigeration working condition, and 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 reduce the speed until the frequency of the compressor 3 is reduced to the target frequency F1, and then controls the compressor to maintain the target frequency F1 to operate.
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 smaller than the target frequency F1, the controller controls the frequency of the compressor 3 to rise until the frequency of the compressor 3 rises to the target frequency F1, and then controls the compressor to maintain the target frequency F1 to operate.
Specifically, on the one hand, if the current frequency F0 is greater than the target frequency F1, at this time, the frequency of the compressor 3 is higher, and the leakage speed of the refrigerant in the room is faster, so that the frequency of the compressor 3 needs to be quickly reduced to the target frequency F1, the leakage speed of the refrigerant in the room is reduced, and the refrigerant recovery mode is performed in the state of the target frequency F1, so that the refrigerant is quickly recovered outdoors, and the leakage speed of the refrigerant in the room is further reduced.
On the other hand, if the current frequency F0 is smaller than the target frequency F1, the frequency of the compressor 3 is low and the refrigerant leakage speed is low, but the refrigerant recovery rate is affected by the low compressor frequency and remains low, which is not beneficial to refrigerant recovery of the air conditioner indoor unit. Since the rate of refrigerant recovery from the indoor unit 8 to the outdoor unit increases with the increase in the frequency of the compressor 3, when the current frequency F0 is smaller 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 frequency-decreasing 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 frequency increasing rate V2 until the frequency of the compressor 3 increases to the target frequency F1.
In some embodiments of the application, the up-conversion rate V2 is not greater than the down-conversion rate V1, i.e., the up-conversion rate V2 is less than or equal to the down-conversion rate V1. Wherein, the units of V1 and V2 are Hz/s.
The frequency of the compressor 3 has an influence on the refrigerant recovery rate, and when the frequency of the compressor 3 is higher, the same time the compressor 3 performs more work, so that a large amount of low-temperature low-pressure refrigerant gas entering the compressor 3 is rapidly compressed into high-temperature high-pressure refrigerant gas, and the high-temperature high-pressure refrigerant gas is rapidly sent to the outdoor heat exchanger 2, so that the refrigerant is recovered more rapidly. However, as the frequency of the compressor 3 increases, the pressure of the refrigerant in the pipe increases, and the leakage rate of the refrigerant remaining in the indoor heat exchanger 1 increases.
When the frequency of the compressor 3 is smaller, the same time compressor 3 does less work, so that the refrigerant gas with low temperature and low pressure entering the compressor 3 is compressed into the refrigerant gas with high temperature and high pressure at a relatively low speed, and the refrigerant gas with high temperature and high pressure is sent into the outdoor heat exchanger 2 at a relatively low speed, and the refrigerant recovery speed is relatively low. However, as the frequency of the compressor 3 is smaller, the pressure of the refrigerant in the pipe is smaller, and the leakage rate of the refrigerant remaining in the indoor heat exchanger 1 is slower.
If the current frequency F0 is smaller than the target frequency F1, the controller controls the frequency of the compressor 3 to rise at the rising frequency rate V2, and the rising frequency rate V2 is smaller than or equal to the falling frequency rate V1, so that the compressor can be controlled to slowly perform rising frequency. Specifically, as the leakage rate of the refrigerant can be increased along with the increase of the frequency of the compressor 3, the smaller frequency raising rate V2 of the compressor 3 can enable the frequency of the compressor 3 to be raised slowly, so that the leakage amount of the refrigerant of the compressor 3 in the process of raising the frequency is reduced, and the leakage condition of the refrigerant is lightened.
If the current frequency F0 is greater than the target frequency F1, the controller controls the frequency of the compressor 3 to be reduced at the frequency reducing rate V1, and the frequency increasing rate V2 is less than or equal to the frequency reducing rate V1, so that the compressor can be controlled to rapidly reduce the frequency. Specifically, the rate of refrigerant leakage can be reduced along with the reduction of the frequency of the compressor 3, so that the frequency of the compressor 3 can be rapidly reduced due to the larger frequency reduction rate V1, thereby reducing the refrigerant leakage amount in the process of reducing the frequency of the compressor 3 and reducing the refrigerant leakage condition.
When the concentration of the refrigerant is not less than the preset first concentration threshold, the refrigerant leaks in the room, the refrigerant of the air conditioning indoor unit 8 leaks and diffuses into the air, and in order to reduce the continuous leakage amount of the refrigerant of the air conditioning indoor unit 8, the controller controls the refrigerant of the air conditioning indoor unit 8 to flow through the pipeline and be recycled to the air conditioning outdoor unit.
When the controller receives the signal of refrigerant leakage or the controller judges that the condition of refrigerant leakage exists, in order to reduce the continuous leakage degree of the refrigerant in the indoor environment, the refrigerant of the indoor unit 8 needs to be recovered to the outdoor unit as soon as possible, that is, the refrigerant in the indoor heat exchanger 1 needs to flow through the pipeline provided with the second stop valve 62 and the second electromagnetic valve 52 to reach the air suction port 31 of the compressor 3, the compressor 3 compresses the indoor refrigerant into high-temperature and high-pressure refrigerant gas and then enters the outdoor heat exchanger 2 from the air outlet 32 of the compressor 3, so that the refrigerant amount of the indoor heat exchanger 1 is gradually reduced, thereby realizing the recovery of the refrigerant of the indoor heat exchanger 1 and reducing the leakage degree 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 is operated at the frequency F1, the refrigerant can be recovered at a faster speed, and the pressure of the pipeline is kept appropriate to avoid the residual refrigerant of the indoor heat exchanger 1 from leaking into the room rapidly. The frequency F1 can be tested according to experimental results, and can also be obtained according to simulation experiments or theoretical calculation.
In the prior art, when the refrigerant leaks, a mode of immediately stopping the operation of the air conditioner is often adopted, the mode can cause that the compressor 3 of the air conditioner is not in an optimal stop state, the compressor 3 is damaged, and the service life of an air conditioning system is reduced.
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 intervals, each interval corresponds to a different deceleration frequency V1, and the controller determines the interval 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 smaller than the target frequency F1, the current frequency F0 of the compressor 3 is divided into at least two different intervals, each interval corresponds to a different ramp-up frequency V2, and the controller determines the interval 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 of the present application, when the concentration of the refrigerant is not less than a preset first concentration threshold, the controller receives a signal indicating that the concentration of the refrigerant is leaked or when the controller determines that the refrigerant is leaked indoors, 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 the direction so that the indoor heat exchanger is an evaporator, and the indoor heat exchanger is adjusted to be in a refrigerating working condition.
If the current frequency F0 is equal to the target frequency F1, the controller controls the frequency of the compressor to keep the target frequency F1 running.
If the current frequency F0 is smaller than the target frequency F1, the controller controls the four-way valve to change the direction so that the indoor heat exchanger is an evaporator, the indoor heat exchanger 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, at this time, the frequency of the compressor 3 is higher, and the leakage speed of the refrigerant in the room is faster, so that the frequency of the compressor 3 needs to be quickly reduced to the target frequency F1, the leakage speed of the refrigerant in the room is reduced, and the refrigerant recovery mode is performed in the state of the target frequency F1, so that the refrigerant is quickly recovered outdoors, and the leakage speed of the refrigerant in the room is further reduced.
On the other hand, if the current frequency F0 is smaller than the target frequency F1, the frequency of the compressor 3 is low at this time, and since the rate of refrigerant recovery from the air conditioning indoor unit 8 to the air conditioning outdoor unit increases with the increase in 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 that the rate of refrigerant recovery increases.
Since the air conditioner is in a heating condition, 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 gaseous refrigerant is condensed and flows to the electronic expansion valve 4 from the first communication port 11. Accordingly, the refrigerant in the indoor heat exchanger 1 is not directly connected to the suction port 31 of the compressor 3, and the refrigerant in the indoor heat exchanger 1 cannot be effectively extracted to the outdoor heat exchanger 2 by the compressor 3 in the heating operation, so that 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 at this time, and the four-way valve 7 cannot be directly turned to the refrigeration condition, the frequency of the compressor 3 needs to be reduced to F1, and then the four-way valve 7 is switched to the refrigeration condition. When the air conditioner is in a refrigerating condition, the indoor heat exchanger 1 serves as an evaporator, the second communication port 12 of the indoor heat exchanger 1 is communicated with the air suction port 31 of the compressor 3, and when the compressor 3 operates at a target frequency F1, the compressor 3 can compress air entering the indoor heat exchanger 1 from the air suction port 31 into high-temperature and high-pressure air and discharge the high-temperature and high-pressure air to the outdoor heat exchanger 2, the outdoor heat exchanger 2 serves as a condenser, and the high-temperature and high-pressure air refrigerant is condensed into liquid refrigerant, so that the recovery of the refrigerant from the indoor heat exchanger 1 to the outdoor heat exchanger 2 is realized.
If the current frequency F0 is smaller than the target frequency F1, the frequency of the compressor 3 is smaller at the moment, the controller can regulate and control the four-way valve 7 to directly turn to a refrigerating working condition, and the refrigerant is recovered under the refrigerating working condition without changing the frequency of the compressor 3 and then recovering the refrigerant, so that the recovery 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 to the target frequency F1 at the frequency-decreasing rate V1, and then controls the four-way valve 7 to change direction to adjust to the refrigeration condition.
In some embodiments of the present application, if the current frequency F0 is smaller than the target frequency F1, the controller controls the four-way valve 7 to change direction to adjust to the refrigeration condition, and then adjusts to the target frequency F1 at the frequency raising rate V2.
In some embodiments of the application, the up-conversion rate V2 is not greater than the down-conversion rate V1, i.e., the up-conversion rate V2 is less than or equal to the down-conversion 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 same time compressor 3 does more work, so that a large amount of low-temperature low-pressure refrigerant gas entering the compressor 3 is rapidly compressed into high-temperature high-pressure refrigerant gas, and the high-temperature high-pressure refrigerant gas is rapidly sent into the outdoor heat exchanger 2, so that the refrigerant is recovered more rapidly. However, as the frequency of the compressor 3 increases, the pressure of the refrigerant in the pipe increases, and the leakage rate of the refrigerant remaining in the indoor heat exchanger 1 increases.
When the frequency of the compressor 3 is smaller, the same time compressor 3 does less work, so that the refrigerant gas with low temperature and low pressure entering the compressor 3 is compressed into the refrigerant gas with high temperature and high pressure at a relatively low speed, and the refrigerant gas with high temperature and high pressure is sent into the outdoor heat exchanger 2 at a relatively low speed, and the refrigerant recovery speed is relatively low. However, as the frequency of the compressor 3 is smaller, the pressure of the refrigerant in the pipe is smaller, and the leakage rate of the refrigerant remaining in the indoor heat exchanger 1 is slower.
If the current frequency F0 is smaller than the target frequency F1, the controller controls the frequency of the compressor 3 to rise at the rising frequency V2, the rising frequency V2 is smaller than or equal to the falling frequency V1, and the rising frequency V2 of the compressor 3 is smaller to enable the rising frequency of the compressor 3 to be slower, so that the refrigerant leakage amount of the compressor 3 in the rising frequency process is reduced, and the refrigerant leakage condition is lightened.
If the current frequency F0 is greater than the target frequency F1, the controller controls the frequency of the compressor 3 to reduce the frequency at a frequency reducing rate V1, the frequency increasing rate V2 is less than or equal to the frequency reducing rate V1, and the frequency reducing rate V1 is larger as the frequency of the compressor 3 is reduced, so that the frequency of the compressor 3 is rapidly reduced, the refrigerant leakage amount in the frequency reducing process of the compressor 3 is reduced, and the refrigerant leakage condition is lightened.
Since the leakage rate of the refrigerant of the compressor 3 increases with the increase of the frequency of the compressor 3, the smaller frequency-increasing rate of the compressor 3 can reduce the leakage amount of the refrigerant of the compressor 3 in the process of increasing the frequency. Since the rate of refrigerant recovery from the indoor unit 8 to the outdoor unit increases with the increase in the frequency of the compressor 3, the controller controls the frequency of the compressor 3 to increase to the target frequency F1 so that the rate of refrigerant recovery increases because the current frequency F0 is smaller than the target frequency F1.
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 intervals, each interval corresponds to a different deceleration frequency V1, the controller determines the interval 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 is smaller than the target frequency F1, the current frequency F0 of the compressor 3 is divided into at least two different intervals, each interval corresponds to a different ramp-up frequency V2, the controller determines the interval 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 air conditioner operation process of the application, when the air conditioner is under a refrigeration working condition and the compressor 3 stably operates at the target frequency F1, the controller adjusts the first electromagnetic valve 51 to be in a closed state, so that the refrigerant of the air conditioner outdoor unit cannot flow to the air conditioner indoor unit 8 through a pipeline where the first electromagnetic valve 51 is positioned, and the refrigerant source of the air conditioner indoor unit 8 is cut off.
The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered. Therefore, the protection scope of the application is 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 the heat absorption;
an electronic expansion valve;
the four-way valve is connected with 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;
the controller is connected with 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 a preset first concentration threshold,
when the indoor heat exchanger is an evaporator, 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;
if the current frequency F0 is smaller than the target frequency F1, controlling the frequency of the compressor to rise to the target frequency F1, and driving the compressor to run at the target frequency F1;
if the current frequency is equal to the target frequency F1, controlling the compressor to maintain the target frequency F1 to operate;
if the current frequency F0 is greater than the target frequency F1, the controller controls the frequency of the compressor to be reduced at a frequency reduction rate V1 until the frequency of the compressor is reduced to the target frequency F1;
if the current frequency F0 is smaller than the target frequency F1, the controller controls the frequency of the compressor to rise at the rising frequency rate V2 until the frequency of the compressor rises to the target frequency F1; the up-conversion rate V2 is not greater than the down-conversion rate V1, wherein V1 and V2 are both in Hz/s.
2. An air conditioner according to claim 1, wherein,
when the current frequency F0 of the compressor is larger than the target frequency F1, dividing the current frequency F0 into at least two different intervals, wherein each interval corresponds to a different deceleration frequency V1, judging the interval in which the current frequency F0 is positioned by the controller, and acquiring the corresponding deceleration frequency V1 to adjust the frequency of the compressor to the target frequency F1;
when the current frequency F0 of the compressor is smaller than the target frequency F1, dividing the current frequency F0 into at least two different intervals, wherein each interval corresponds to a different speed-up frequency V2, and the controller judges the interval where the current frequency F0 is located and then acquires the corresponding speed-up frequency V2.
3. The air conditioner of claim 1, wherein the concentration sensor includes a control unit, the control unit presets a first concentration threshold, and 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 signal of refrigerant leakage to the controller, and the controller receives the signal of refrigerant leakage.
4. The air conditioner according to claim 1, wherein the controller presets a first concentration threshold value, the concentration sensor transmits a signal of the concentration of the refrigerant in the indoor environment detected in real time to the controller, and the controller judges that the refrigerant leaks in the room when the concentration of the refrigerant in the room is not less than the first concentration threshold value.
5. An air conditioner according to claim 1 or 2, further comprising a first solenoid valve and a first stop valve, wherein the first solenoid valve is arranged on a pipeline between the electronic expansion valve and the indoor heat exchanger, the first stop valve is arranged on a pipeline between the first solenoid valve and the indoor heat exchanger, the first solenoid valve is used for regulating and controlling the flow of a flowing medium in a pipeline where the first solenoid valve is arranged, and the first stop valve is used for cutting off and throttling the flowing medium in the pipeline where the first stop valve is arranged.
6. The air conditioner according to claim 5, further comprising a four-way valve through which the indoor heat exchanger and the outdoor heat exchanger are connected, respectively, and the compressor including a first valve port, a second valve port, a third valve port, and a fourth valve port, the compressor including an intake port connected to the first valve port and an exhaust port connected to the third valve 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. An air conditioner according to claim 1 or 2, further comprising a second electromagnetic valve and a second stop valve, wherein the second electromagnetic valve is arranged on a pipeline between the four-way valve and the indoor heat exchanger, the second stop valve is arranged on a pipeline between the second electromagnetic valve and the indoor heat exchanger, the second electromagnetic valve is used for regulating and controlling the flow of a flowing medium in a pipeline where the second electromagnetic valve is arranged, and the second stop valve is used for cutting off and throttling the flowing medium in the pipeline where the second stop valve is arranged.
8. The air conditioner of claim 7, further comprising a first solenoid valve disposed on a pipeline between the electronic expansion valve and the indoor heat exchanger, the first solenoid valve being configured to regulate a flow rate of a flowing medium in the pipeline, the first solenoid valve and the second solenoid valve being respectively connected to the controller.
9. The air conditioner according to claim 5, wherein,
the air conditioner further comprises a second electromagnetic valve and a second stop valve, wherein the second electromagnetic valve is arranged on the pipeline between the four-way valve and the indoor heat exchanger, the second stop valve is arranged on the pipeline between the second electromagnetic valve and the indoor heat exchanger, the second electromagnetic valve is used for regulating and controlling the flow of a flowing medium in the pipeline where the second electromagnetic valve is positioned, and the second stop valve is used for cutting off and throttling the flowing medium in the pipeline where the second stop valve is positioned;
the indoor heat exchanger comprises a first communication port and a second communication port, the first communication port is communicated with the first stop valve, and the second communication port is communicated with the second stop valve; the outdoor heat exchanger comprises a third communication port and a fourth communication port, wherein the third communication port is communicated with the electronic expansion valve, and the fourth communication port is communicated with the four-way valve.
10. The air conditioner of claim 6, further comprising a discharge sensor on the line between the discharge port and the third valve port for measuring a discharge temperature of the compressor.
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