CN111256292B - Air conditioner and control method thereof - Google Patents
Air conditioner and control method thereof Download PDFInfo
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- CN111256292B CN111256292B CN202010091422.XA CN202010091422A CN111256292B CN 111256292 B CN111256292 B CN 111256292B CN 202010091422 A CN202010091422 A CN 202010091422A CN 111256292 B CN111256292 B CN 111256292B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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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
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/20—Electric components for separate outdoor units
- F24F1/24—Cooling of electric components
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Physics & Mathematics (AREA)
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- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner and a control method thereof, relates to the technical field of air conditioners, and aims to control the flow of a refrigerant in a radiator, reduce the effective cold loss of a refrigerant circulation main flow path and improve the energy efficiency of the air conditioner. The air conditioner comprises a compressor, a first heat exchanger, a second heat exchanger, a radiator and a power module, wherein the compressor, the first heat exchanger and the second heat exchanger are sequentially communicated through a refrigerant pipeline to form a refrigerant main circulation loop, and the radiator is communicated with the refrigerant pipeline through a heat dissipation pipeline to form a refrigerant branch circulation loop and exchanges heat with the power module. The controller can control the flow of the refrigerant flowing into the heat dissipation pipeline through the electronic expansion valve. The invention is used for adjusting air parameters.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method thereof.
Background
The air conditioner is a heat exchange device and comprises an indoor air conditioner unit, wherein the indoor air conditioner unit is arranged indoors, and heat or cold generated by heating or refrigerating an internal system of the air conditioner is delivered indoors through a fan, so that the purpose of adjusting the indoor temperature is achieved.
The air-cooled heat dissipation mode is adopted for the high-power variable frequency air conditioner, and the heat of the power module cannot be effectively taken away, so that the frequency of the compressor is limited, and the performance of the air conditioner is influenced. At present, a high-power inverter air conditioner generally cools a power module by adopting a refrigerant cooling method, that is, a part of refrigerant is extracted from a refrigerant circulation main flow path to cool the power module. Specifically, a high-pressure liquid medium-temperature (about 40 ℃) refrigerant with a certain supercooling degree at the outlet of the condenser is introduced into the radiator, the radiator is fixedly connected with the power module through screws, and heat-conducting silicone grease is filled between the radiator and the power module.
However, in the use process of the high-power inverter air conditioner, when the temperature of the power module is low and cooling is not needed, the refrigerant still exchanges heat with the power module through the radiator, so that effective cooling loss of the refrigerant circulation main flow path is caused.
Disclosure of Invention
The invention provides an air conditioner and a control method thereof, which are used for controlling the flow of a refrigerant in a radiator, reducing the effective cold loss of a refrigerant circulation main flow path and improving the energy efficiency of the air conditioner.
In order to achieve the purpose, the invention adopts the following technical scheme:
an air conditioner, comprising: a compressor; the power module is used for adjusting the output power of the compressor; the first heat exchanger is used for exchanging heat with outdoor air; the second heat exchanger is used for exchanging heat with indoor air; a heat sink for reducing a temperature of the power module; the compressor, the first heat exchanger and the second heat exchanger are communicated in sequence through a refrigerant pipeline to form a refrigerant main circulation loop; the radiator comprises a heat dissipation pipeline, and the heat dissipation pipeline is communicated with the refrigerant pipeline to form a refrigerant branch circulation loop; the air conditioner further includes: the electronic expansion valve is arranged in the heat dissipation pipeline; the controller is electrically connected with the electronic expansion valve; the controller can control the flow of the refrigerant flowing into the heat dissipation pipeline through the electronic expansion valve.
The air conditioner comprises a compressor, a first heat exchanger, a second heat exchanger, a radiator and a power module, wherein the compressor, the first heat exchanger and the second heat exchanger are sequentially communicated through a refrigerant pipeline to form a refrigerant main circulation loop, and the radiator is communicated with the refrigerant pipeline through a heat dissipation pipeline to form a refrigerant branch circulation loop and exchanges heat with the power module. The controller can control the flow of the refrigerant flowing into the heat dissipation pipeline through the electronic expansion valve. At the moment, when the power module does not need to be cooled, the flow of the refrigerant in the heat dissipation pipeline can be reduced through the electronic expansion valve, or the refrigerant is prevented from flowing through the heat dissipation pipeline to form a refrigerant branch circulation loop, so that the effective cold loss of the refrigerant main circulation loop is reduced, the energy efficiency of the air conditioner is improved, and the reliable operation of the refrigerating unit is ensured. Compared with the prior art, the air conditioner provided by the embodiment of the invention can control the flow of the refrigerant in the radiator, and solves the problem that the effective refrigerating capacity of the refrigerant circulation main flow path is lost due to the fact that the refrigerant exchanges heat with the power module through the radiator when the power module does not need to be cooled.
On the other hand, an embodiment of the present invention further provides a method for controlling an air conditioner, where the air conditioner includes an outdoor temperature sensor and a radiator temperature sensor, and the method includes: judging the operation mode of the air conditioner; in a refrigeration mode, acquiring outdoor temperature information, radiator temperature information and the load proportion of an air conditioner; when the outdoor temperature is higher than the preset outdoor temperature, the temperature of the radiator is higher than the preset temperature of the radiator, and the load proportion of the air conditioner is higher than the preset load proportion; the controller controls the electronic expansion valve to be opened to a first initial opening degree; in the heating mode; the controller controls the electronic expansion valve to be opened to a second initial opening degree.
Compared with the prior art, the beneficial effects of the control method provided by the embodiment of the invention are the same as those of the air conditioner provided by the technical scheme, and are not repeated herein.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating steps of a method for controlling an air conditioner according to an embodiment of the present invention;
fig. 3 is a second flowchart illustrating steps of a method for controlling an air conditioner according to an embodiment of the present invention;
fig. 4 is a third step flowchart of a control method of an air conditioner according to an embodiment of the present invention.
Reference numerals:
1-a compressor; 2-a power module; 3-a first heat exchanger; 4-a second heat exchanger; 5-a radiator; 6-refrigerant pipeline; 7-a heat dissipation pipeline; 8-an electronic expansion valve; 9-gas-liquid separator; 10-four-way reversing valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
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 implicitly indicating 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, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
An embodiment of the present invention provides an air conditioner, as shown in fig. 1, including: a compressor 1; a power module 2 for adjusting the output power of the compressor 1; the first heat exchanger 3 is used for exchanging heat with outdoor air; the second heat exchanger 4 is used for exchanging heat with indoor air; a heat sink 5 for reducing the temperature of the power module 2; the compressor 1, the first heat exchanger 3 and the second heat exchanger 4 are communicated in sequence through a refrigerant pipeline 6 to form a refrigerant main circulation loop; the radiator 5 comprises a heat dissipation pipeline 7, and the heat dissipation pipeline 7 is communicated with the refrigerant pipeline 6 to form a refrigerant branch circulation loop; the air conditioner further includes: the electronic expansion valve 8, the electronic expansion valve 8 is set up in the heat-dissipating pipeline 7; the controller is electrically connected with the electronic expansion valve 8; the controller can control the flow rate of the refrigerant flowing into the heat radiation pipeline 7 through the refrigerant pipeline 6 by the electronic expansion valve 8.
The air conditioner of the embodiment of the invention, as shown in fig. 1, comprises a compressor 1, a first heat exchanger 3, a second heat exchanger 4, a radiator 5 and a power module 2, wherein the compressor 1, the first heat exchanger 3 and the second heat exchanger 4 are sequentially communicated through a refrigerant pipeline 6 to form a refrigerant main circulation loop, and the radiator 5 is communicated with the refrigerant pipeline 6 through a heat dissipation pipeline 7 to form a refrigerant sub-circulation loop and exchanges heat with the power module 2. An electronic expansion valve 8 is arranged in the heat dissipation pipeline 7, and the controller can control the flow rate of the refrigerant flowing into the heat dissipation pipeline 7 through the refrigerant pipeline 6 through the electronic expansion valve 8. At this time, when the power module 2 does not need to be cooled, the flow rate of the refrigerant in the heat dissipation pipeline 7 can be reduced through the electronic expansion valve 8, or the refrigerant is prevented from flowing through the heat dissipation pipeline 7 to form a refrigerant branch circulation loop, so that the effective cold loss of the refrigerant main circulation loop is reduced, the energy efficiency of the air conditioner is improved, and the reliable operation of the refrigerating unit is ensured. Compared with the prior art, the air conditioner provided by the embodiment of the invention can control the flow of the refrigerant in the radiator 5, and solves the problem that the effective cooling capacity of the refrigerant circulation main flow path is lost due to the heat exchange of the refrigerant with the power module 2 through the radiator 5 when the power module 2 does not need to be cooled.
The electronic expansion valve 8 is usually disposed at the refrigerant inlet end of the heat dissipation duct 7, and is controlled before the heat sink 5 exchanges heat with the power module 2, so as to further reduce the effective refrigeration loss of the refrigerant main circulation circuit. It should be understood that the refrigerant outlet of the compressor 1 is connected with a four-way reversing valve 10 for changing the refrigerant flow direction of the refrigerant main circulation loop; meanwhile, a plurality of electronic expansion valves can be arranged on the refrigerant main circulation loop to control the refrigerant flow on the refrigerant main circulation loop.
Referring to fig. 1, the communication position between the heat dissipation pipeline 7 and the refrigerant pipeline 6 is not unique, for example, the refrigerant inlet end of the heat dissipation pipeline 7 may be connected to the front end of the return port of the compressor 1, and the refrigerant exchanges heat with the power module 2 by using a gaseous refrigerant, and then flows into the compressor 1; for another example, the refrigerant inlet end of the heat dissipation pipeline 7 may be connected to the refrigerant pipeline 6 between the first heat exchanger 3 and the second heat exchanger 4, so that the high-pressure medium-temperature liquid refrigerant is throttled by the electronic expansion valve 8, changed into a low-temperature low-pressure two-phase refrigerant (mixed liquid and gas), and then exchanges heat with the power module 2, and is changed into gas, and then flows into the compressor 1; preferably, the refrigerant inlet end of the heat dissipation pipeline 7 is connected between the first heat exchanger 3 and the second heat exchanger 4, and the refrigerant outlet end of the heat dissipation pipeline 7 is connected to the front end of the return port of the compressor 1 along the flow direction of the cold coal. Under the condition, the high-pressure medium-temperature liquid refrigerant is throttled by the electronic expansion valve 8 and then is changed into a low-temperature low-pressure two-phase refrigerant, and then the refrigerant exchanges heat with the power module 2, so that the effective cold loss of a main circulation loop of the refrigerant is reduced, the heat exchange efficiency is greatly improved, and the reliability of the whole machine is improved. In addition, when the electronic expansion valve 8 is used for controlling the flow of the liquid refrigerant in the heat dissipation pipeline 7, the generated noise is small, and the user experience is high.
The heat exchange efficiency of the radiator 5 and the power module 2 is high, and when the electronic expansion valve 8 is used for controlling the flow of the liquid refrigerant in the heat dissipation pipeline 7, the generated noise is low, and the user experience is high.
It should be understood that the refrigerant after the heat exchange between the refrigerant branch circulation circuit and the refrigerant main circulation circuit should be in a gaseous state, but there may still be some refrigerant in a liquid state that does not exchange heat and flows to the compressor 1 together with the refrigerant in the gaseous state. After the liquid refrigerant enters the compressor 1, the liquid refrigerant may cause the compressor 1 to generate a liquid impact phenomenon, which may cause damage to the compressor 1. Therefore, in order to ensure reliable operation of the refrigeration unit and prevent liquid refrigerant from entering the compressor 1, referring to fig. 1, a gas-liquid separator 9 is further disposed between the refrigerant outlet end of the heat dissipation pipeline 7 and the return port of the compressor 1. At this time, the refrigerant after heat exchange of the refrigerant branch circulation loop and the refrigerant after heat exchange of the refrigerant main circulation loop both enter the gas-liquid separator 9, so that the liquid refrigerant is left in the gas-liquid separator 9, the gaseous refrigerant continues to flow into the compressor 1, the reliable operation of the refrigerating unit is ensured, and the problem that the compressor 1 is damaged due to the fact that the liquid refrigerant enters the compressor 1 is avoided.
Wherein, be equipped with the mounting groove on above-mentioned radiator 5, in the 2 embedding mounting grooves of power module, compare in power module 2 and the direct laminating of radiator 5, the heat transfer area in the 2 embedding mounting grooves of power module is great, and heat exchange efficiency is high. In addition, the mounting groove and the connection gaps around the power module 2 are provided with sealant, so that the radiator 5 is insulated from the outside and has certain cold insulation effect, namely, when the air conditioner load is low, a small amount of cold accumulation can be carried out in the mounting groove of the radiator 5, the heat exchange efficiency can be improved, and the loss of effective cold quantity is reduced.
It should be noted that the surface of the mounting groove, which is attached to the power module 2, may be coated with a heat conductive silica gel to reduce thermal contact resistance generated between the contact surface of the power module 2 and the heat sink 5, thereby increasing heat exchange efficiency. However, since the heat conducting property of the heat conducting silica gel deteriorates with the increase of the use time, whether the heat conducting silica gel needs to be coated or not can be selected according to actual conditions. In addition, the material of the heat sink 5 is usually aluminum, and the heat sink 5 is designed in a form of a "micro channel", so that the refrigerant introduced by the heat sink 5 is naturally throttled and depressurized, and the purpose of rapidly cooling the power module 2 is achieved.
It should be understood that, whether the temperature of the power module 2 is too high has a great correlation with the external environment temperature, the temperature of the radiator 5 and the load ratio of the air conditioner, in order to determine whether the electronic expansion valve 8 needs to be opened, referring to fig. 1, the air conditioner further includes an outdoor temperature sensor and a radiator temperature sensor, the outdoor temperature sensor is used for detecting the outdoor temperature and outputting outdoor temperature information, and the outdoor temperature sensor is electrically connected with the controller; the radiator temperature sensor is used for detecting the temperature of the radiator 5 and outputting radiator temperature information, and the radiator temperature sensor is electrically connected with the controller; the controller can determine whether to open the electronic expansion valve 8 according to the outdoor temperature information, the radiator temperature information, and the load ratio of the air conditioner. Illustratively, when the outdoor temperature is higher than 30 ℃, the boot load proportion is greater than 50% and the temperature of the radiator 5 is greater than 25 ℃, the controller controls the electronic expansion valve 8 to be opened so as to prevent the power module 2 from overheating; when the outdoor temperature is less than or equal to 30 ℃, or the starting load proportion is less than or equal to 50%, or the temperature of the radiator 5 is less than or equal to 25 ℃, the temperature of the power module 2 usually does not exceed the normal working temperature range, and the electronic expansion valve 8 is in a closed state, so that the effective cold loss of a refrigerant circulation main flow path is avoided, and the energy efficiency of the air conditioner is improved.
Further, in order to more accurately control the flow rate of the refrigerant in the heat dissipation pipe 7 when the electronic expansion valve 8 is in the open state, the opening degree of the electronic expansion valve 8 may be adjusted according to the temperature of the power module 2, or may be adjusted according to the temperature of the power module 2 and the superheat degree of the refrigerant at the refrigerant outlet of the radiator 5. For example, the air conditioner further comprises a power module temperature sensor, the power module temperature sensor is used for detecting the temperature of the power module 2 and outputting the temperature information of the power module, and the power module temperature sensor is electrically connected with the controller; the controller can judge whether to adjust the opening of the electronic expansion valve 8 according to the temperature information of the power module. The principle that the controller adjusts the opening of the electronic expansion valve 8 according to the temperature information of the power module is as follows: on the premise that the temperature of the power module meets the use reliability, the refrigerant flow of the radiator 5 is reduced as much as possible, and the cold loss of the refrigerant main circulation loop is reduced. For example, when the temperature of the power module is greater than 65 ℃, the controller controls the opening degree of the electronic expansion valve 8 to be increased by 5 pls; when the power module temperature is less than 45 ℃, the controller controls the opening degree of the electronic expansion valve 8 to be decreased by 5 pls.
For another example, the air conditioner further comprises a radiator refrigerant outlet temperature sensor and a refrigerant pressure sensor, wherein the radiator refrigerant outlet temperature sensor is used for detecting the refrigerant temperature of a refrigerant outlet of the radiator 5 and outputting refrigerant temperature information, and the radiator refrigerant outlet temperature sensor is electrically connected with the controller; the refrigerant pressure sensor is used for detecting the refrigerant pressure at the refrigerant outlet of the radiator 5 and outputting refrigerant pressure information, and the refrigerant pressure sensor is electrically connected with the controller; the controller can obtain the superheat degree of the refrigerant at the outlet of the radiator 5 according to the refrigerant temperature information and the refrigerant pressure information, wherein the superheat degree is equal to the saturation temperature value obtained by subtracting the refrigerant pressure from the refrigerant temperature; the controller can judge whether to adjust the opening of the electronic expansion valve 8 according to the temperature information of the power module and the superheat degree. For example, when the temperature of the power module is greater than 60 ℃ and the superheat degree is greater than 4 ℃, the controller controls the opening degree of the electronic expansion valve 8 to be increased by 5 pls; when the temperature of the power module is less than 45 ℃ and the superheat degree is less than 1 ℃, the controller controls the opening degree of the electronic expansion valve 8 to be reduced by 5 pls.
In order to prevent the electronic expansion valve 8 from being completely closed, that is, no refrigerant flows in the heat dissipation pipe 7 of the radiator 5, during the adjustment of the opening degree of the electronic expansion valve 8, the electronic expansion valve 8 is set to have a minimum opening degree, and the electronic expansion valve 8 is illustratively an electronic expansion valve, and has an opening degree ranging from 0pls to 480pls, and a minimum opening degree of 60 pls.
On the other hand, an embodiment of the present invention further provides a control method of the air conditioner, and referring to fig. 2, the control method includes:
step S100: and judging the operation mode of the air conditioner.
Step S200: in the cooling mode, outdoor temperature information, radiator temperature information and the load proportion of the air conditioner are obtained. The outdoor temperature information and the radiator temperature information may be sent to the controller by the outdoor temperature sensor and the radiator temperature sensor, or the outdoor temperature information and the radiator temperature information may be stored by the outdoor temperature sensor and the radiator temperature sensor, and the controller acquires the outdoor temperature information and the radiator temperature information, but is not limited thereto.
Step 210: when the outdoor temperature is higher than the preset outdoor temperature, the radiator temperature is higher than the preset radiator temperature, and the load proportion of the air conditioner is higher than the preset load proportion. The preset outdoor temperature is 30 ℃, the preset radiator temperature is 25 ℃, the preset load proportion is 50%, and the load proportion of the air conditioner can be obtained by the controller through calculation, but the invention is not limited to this.
Step 220: the controller controls the electronic expansion valve to be opened to a first initial opening degree. The opening degree of the electronic expansion valve is in the range of 0pls to 480pls, and the first initial opening degree is in the range of 100pls to 120 pls. Illustratively, the first initial opening degree is 100pls, and experiments show that, at this time, the air conditioner has low refrigeration capacity loss and high energy efficiency on the premise that the temperature of the power module meets the use reliability.
Unlike the cooling mode, the air conditioner in the heating mode generally has an outdoor ambient temperature of 24 ℃ or less, and therefore, the temperature of the power module is not excessively high unless abnormally operated, but the control method further includes, in consideration of reliable operation of the refrigeration unit:
step S300: in the heating mode, the controller controls the electronic expansion valve to be opened to a second initial opening degree. The opening degree of the electronic expansion valve ranges from 0pls to 480pls, and the second initial opening degree ranges from 60pls to 80 pls. Illustratively, the second initial opening is 80pls, and experiments show that, at this time, the air conditioner has low cold loss and high energy efficiency on the premise that the temperature of the power module meets the use reliability.
In order to further reduce the loss of effective cooling capacity in the main refrigerant circulation circuit, referring to fig. 2 after step S210, the control method further includes:
step S230: the method comprises the steps of obtaining the frequency of a compressor, the running time of the compressor, the temperature information of a power module and the temperature information of a radiator. The power module temperature information and the radiator temperature information may be sent to the controller by the power module temperature sensor and the radiator temperature sensor, or the power module temperature information and the radiator temperature information are stored by the power module temperature sensor and the radiator temperature sensor, the controller acquires the power module temperature information and the radiator temperature information, the frequency of the compressor may be directly acquired by the controller, and the operation duration of the compressor may be acquired by the controller through recording, but is not limited thereto.
Step S240: and judging whether at least one of the first condition, the second condition, the third condition and the fourth condition meets a preset time length. The preset time length can be specifically selected according to actual conditions, so that the output result of the detected first condition, second condition, third condition or fourth condition is stable, the detected output result is not a detection output result of one-time abnormity, and the reliability is high. Illustratively, the preset time period is 1min, but is not limited thereto. In addition, the first condition is that the frequency of the compressor is greater than the preset frequency, the second condition is that the running time of the compressor is greater than the preset time, the third condition is that the temperature of the power module is greater than the first temperature, the fourth condition is that the temperature of the radiator is greater than the second temperature, and the second temperature is the dew point temperature value corresponding to the outdoor environment temperature plus 2. Illustratively, the predetermined frequency is 60HZ, the predetermined time period is 5min, and the first temperature is 50 ℃, but not limited thereto.
Step S250: and if so, entering a refrigeration fine adjustment mode of the electronic expansion valve to further accurately control the flow of the refrigerant in the heat dissipation pipeline and improve the energy efficiency.
Specifically, referring to fig. 3, the control method includes:
step S251: under the refrigeration fine adjustment mode of the electronic expansion valve, the temperature of the power module, the temperature of a refrigerant at a refrigerant outlet of the radiator and the pressure of the refrigerant at the refrigerant outlet of the radiator are obtained, and the superheat degree of the refrigerant at the outlet of the radiator is calculated. The power module temperature, the refrigerant temperature at the refrigerant outlet of the radiator, and the refrigerant pressure at the refrigerant outlet of the radiator may be sent to the controller by a power module temperature sensor, a radiator refrigerant outlet temperature sensor, and a refrigerant pressure sensor, or the power module temperature, the radiator refrigerant outlet temperature sensor, and the refrigerant pressure sensor store the power module temperature, the refrigerant temperature at the refrigerant outlet of the radiator, and the refrigerant pressure at the refrigerant outlet of the radiator, and the controller obtains the power module temperature, the refrigerant temperature at the refrigerant outlet of the radiator, and the refrigerant pressure at the refrigerant outlet of the radiator, but is not limited thereto.
Step S252: and when the temperature of the power module is greater than the first preset temperature of the power module or the temperature of the power module is greater than the second preset temperature of the power module and the superheat degree is greater than the first preset superheat degree. The first preset power module temperature is 65 ℃, the second preset power module temperature is 60 ℃, and the first preset superheat degree is 4 ℃, but not limited thereto.
Step S253: the controller controls the opening degree of the electronic expansion valve to increase by a first preset value. The first preset value may be selected according to an actual situation, for example, the first preset value is 5pls, the adjustment of the opening degree of the electronic expansion valve is small, the flow rate of the refrigerant in the heat dissipation pipeline is accurate, and the flow rate change of the refrigerant in the heat dissipation pipeline is obvious.
Step S254: and after the operation is carried out for the first preset time, the refrigeration fine adjustment mode of the electronic expansion valve is operated again. After step S253, the radiator adjusted by the electronic expansion valve can be ensured to enter a stable working state by operating for a first preset time, and then the refrigeration fine tuning mode of the electronic expansion valve is operated again, so as to determine whether the temperature of the power module adjusted by the electronic expansion valve meets the requirement. Illustratively, the first preset time period is 30s, but is not limited thereto.
Step S255: and when the temperature of the power module is less than the third preset temperature of the power module or the superheat degree is less than the second preset superheat degree. The third preset power module temperature is 45 ℃, and the second preset superheat degree is 1 ℃, but the invention is not limited thereto.
Step S256: the controller controls the opening degree of the electronic expansion valve to be reduced by a second preset value. The second preset value can be selected according to actual conditions, for example, the second preset value is 5pls, the adjustment of the opening degree of the electronic expansion valve is small, the flow rate of the refrigerant in the heat dissipation pipeline is accurate, and the adjustment effect is obvious.
Step S257: and after the operation is carried out for the second preset time, the refrigeration fine adjustment mode of the electronic expansion valve is operated again. After step S256, the operation is performed for a second preset time period, which may ensure that the radiator adjusted by the electronic expansion valve enters a stable working state, and then the refrigeration fine tuning mode of the electronic expansion valve is re-performed, so as to determine whether the temperature of the power module adjusted by the electronic expansion valve meets the requirement. Illustratively, the second preset time period is 30s, but is not limited thereto.
In the cooling mode, when the electronic expansion valve does not need to be adjusted, the electronic expansion valve is periodically operated in the cooling fine adjustment mode. The period may be 3s, but may be set according to actual conditions.
After the step S300, the control method further includes:
step S310: power module temperature information is obtained. The power module temperature information may be sent to the controller by the power module temperature sensor, or the power module temperature information may be stored by the power module temperature sensor, and the controller obtains the power module temperature information.
Step S320: and judging whether the temperature of the power module is within a preset temperature range. The preset temperature range is set according to a required temperature range for normal operation of the power module, and is, for example, 45 ℃ to 60 ℃, although not limited thereto.
Step S330: if not, entering an electronic expansion valve heating fine adjustment mode to further accurately control the flow of the refrigerant in the heat dissipation pipeline and improve the energy efficiency.
Specifically, referring to fig. 4, the control method includes:
step S331: and acquiring the temperature of the power module in a heating fine adjustment mode of the electronic expansion valve. The power module temperature information may be sent to the controller by the power module temperature sensor, or the power module temperature information may be stored by the power module temperature sensor, and the controller acquires the power module temperature information, but is not limited thereto.
Step S332: and when the temperature of the power module is higher than the fourth preset temperature of the power module. The fourth preset power module temperature is 65 ℃, but not limited thereto.
Step S333: the controller controls the opening degree of the electronic expansion valve to increase by a third preset value. The third preset value can be selected according to actual conditions, for example, the third preset value is 5pls, the adjustment of the opening degree of the electronic expansion valve is small, the flow rate of the refrigerant in the heat dissipation pipeline is accurate, and the adjustment effect is obvious.
Step S334: and after the operation for the third preset time, the heating fine adjustment mode of the electronic expansion valve is operated again. After step S333, the operation is performed for a third preset time period, which may ensure that the radiator adjusted by the electronic expansion valve enters a stable working state, and then the refrigeration fine tuning mode of the electronic expansion valve is re-performed, so as to determine whether the temperature of the power module adjusted by the electronic expansion valve meets the requirement. Illustratively, the third preset time period is 30s, but is not limited thereto.
Step S335: when the power module temperature is less than a fifth preset power module temperature. The fifth preset power module temperature is 45 ℃, but not limited thereto.
Step S336: the controller controls the opening degree of the electronic expansion valve to be reduced by a fourth preset value. The fourth preset value can be selected according to actual conditions, for example, the fourth preset value is 5pls, the adjustment of the opening degree of the electronic expansion valve is small, the flow rate of the refrigerant in the heat dissipation pipeline is accurate, and the adjustment effect is obvious.
Step S337: and after the operation for the fourth preset time, the heating fine adjustment mode of the electronic expansion valve is operated again. After step S336, the radiator adjusted by the electronic expansion valve can be ensured to enter a stable working state by operating for a fourth preset time, and then the refrigeration fine tuning mode of the electronic expansion valve is operated again, so as to determine whether the temperature of the power module adjusted by the electronic expansion valve meets the requirement. Illustratively, the fourth preset time period is 30s, but is not limited thereto.
In the heating mode, when the electronic expansion valve does not need to be adjusted, the electronic expansion valve heating fine adjustment mode is periodically operated. The period may be 3s, but may be set according to actual conditions.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
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 changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in 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 (6)
1. A control method of an air conditioner, the air conditioner comprising: a compressor; a power module for adjusting an output power of the compressor; the first heat exchanger is used for exchanging heat with outdoor air; the second heat exchanger is used for exchanging heat with indoor air; the compressor, the first heat exchanger and the second heat exchanger are communicated in sequence through refrigerant pipelines to form a refrigerant main circulation loop; the radiator is used for reducing the temperature of the power module and comprises a heat dissipation pipeline, and the heat dissipation pipeline is communicated with the refrigerant pipeline to form a refrigerant branch circulation loop;
the heat radiator is characterized in that the heat radiator is designed in a micro-channel mode, a mounting groove is formed in the heat radiator, the power module is embedded into the mounting groove, and sealant is arranged in a connecting gap between the mounting groove and the periphery of the power module; the air conditioner further includes: the electronic expansion valve is arranged in the heat dissipation pipeline; the controller is electrically connected with the electronic expansion valve and can control the flow of the refrigerant flowing into the heat dissipation pipeline through the electronic expansion valve; the power module temperature sensor is used for detecting the temperature of the power module and outputting power module temperature information, the power module temperature sensor is electrically connected with the controller, and the controller can judge whether to adjust the opening of the electronic expansion valve according to the power module temperature information;
the control method comprises the following steps:
judging the operation mode of the air conditioner;
under a refrigeration mode, acquiring outdoor temperature information, radiator temperature information and the load proportion of the air conditioner;
when the outdoor temperature is higher than the preset outdoor temperature, the temperature of the radiator is higher than the preset temperature of the radiator, and the load proportion of the air conditioner is higher than the preset load proportion;
the controller controls the electronic expansion valve to be opened to a first initial opening degree;
in the heating mode, the controller controls the electronic expansion valve to be opened to a second initial opening degree;
the first initial opening degree is greater than the second initial opening degree;
after the controller controls the electronic expansion valve to be opened to the first initial opening degree, the control method further includes:
acquiring the frequency of a compressor, the running time of the compressor, the temperature information of a power module and the temperature information of a radiator;
judging whether at least one of the first condition, the second condition, the third condition and the fourth condition meets a preset time length;
if yes, entering a refrigeration fine adjustment mode of the electronic expansion valve;
wherein the content of the first and second substances,
the first condition is that the frequency of the compressor is greater than a predetermined frequency, the second condition is that the operating duration of the compressor is greater than a predetermined duration, the third condition is that the power module temperature is greater than a first temperature, and the fourth condition is that the radiator temperature is greater than a second temperature;
under the refrigeration fine adjustment mode of the electronic expansion valve, acquiring the temperature of a power module, the temperature of a refrigerant at a refrigerant outlet of a radiator and the pressure of the refrigerant at the refrigerant outlet of the radiator, and calculating the superheat degree of the refrigerant at the outlet of the radiator;
when the temperature of the power module is greater than a first preset power module temperature or the temperature of the power module is greater than a second preset power module temperature and the superheat degree is greater than a first preset superheat degree;
the controller controls the opening degree of the electronic expansion valve to increase a first preset value, and after the electronic expansion valve operates for a first preset time, the electronic expansion valve operates again in a refrigeration fine adjustment mode;
when the temperature of the power module is lower than a third preset power module temperature or the superheat degree is lower than a second preset superheat degree;
the controller controls the opening degree of the electronic expansion valve to reduce a second preset value, and after the electronic expansion valve operates for a second preset time, the electronic expansion valve is operated again in a refrigeration fine adjustment mode;
after the controller controls the electronic expansion valve to be opened to the second initial opening degree, the control method further includes:
acquiring temperature information of a power module;
judging whether the temperature of the power module is within a preset temperature range or not;
if not, entering an electronic expansion valve heating fine adjustment mode;
acquiring the temperature of a power module in a heating fine adjustment mode of the electronic expansion valve;
when the power module temperature is greater than a fourth preset power module temperature,
the controller controls the opening degree of the electronic expansion valve to increase a third preset value, and after the electronic expansion valve operates for a third preset time, the heating fine adjustment mode of the electronic expansion valve is operated again;
when the power module temperature is less than a fifth preset power module temperature,
and the controller controls the opening degree of the electronic expansion valve to reduce a fourth preset value, and after the fourth preset time period is operated, the heating fine adjustment mode of the electronic expansion valve is operated again.
2. The control method according to claim 1, wherein the opening degree of the electronic expansion valve ranges from 0pls to 480pls, the first initial opening degree ranges from 100pls to 120pls, and the second initial opening degree ranges from 60pls to 80 pls.
3. The control method according to claim 1, wherein in the air conditioner, a refrigerant inlet end of the heat dissipation pipeline is connected between the first heat exchanger and the second heat exchanger, and a refrigerant outlet end of the heat dissipation pipeline is connected to a front end of a return port of the compressor in a flow direction of the cooling coal.
4. The control method according to claim 3, wherein a gas-liquid separator is further provided between a refrigerant outlet end of the heat dissipation pipe and a return port of the compressor in the air conditioner.
5. The control method according to claim 1, wherein the air conditioner further comprises:
the outdoor temperature sensor is used for detecting outdoor temperature and outputting outdoor temperature information, and the outdoor temperature sensor is electrically connected with the controller;
the radiator temperature sensor is used for detecting the temperature of the radiator and outputting radiator temperature information, and the radiator temperature sensor is electrically connected with the controller;
the controller can judge whether to open the electronic expansion valve according to the outdoor temperature information, the radiator temperature information and the load proportion of the air conditioner.
6. The control method according to claim 1, wherein the air conditioner further comprises:
the radiator refrigerant outlet temperature sensor is used for detecting the refrigerant temperature of a refrigerant outlet of the radiator and outputting refrigerant temperature information, and the radiator refrigerant outlet temperature sensor is electrically connected with the controller;
the refrigerant pressure sensor is used for detecting the refrigerant pressure at a refrigerant outlet of the radiator and outputting refrigerant pressure information, and the refrigerant pressure sensor is electrically connected with the controller;
the controller can judge whether to adjust the opening of the electronic expansion valve according to the temperature information of the power module, the temperature information of the refrigerant and the pressure information of the refrigerant.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114688710B (en) * | 2020-12-31 | 2023-02-24 | 广东美的制冷设备有限公司 | Air conditioner, control method, and computer-readable storage medium |
| CN112984881B (en) * | 2021-03-05 | 2023-03-24 | 四川长虹空调有限公司 | Liquid return judgment method and system for compressor of refrigeration system |
| CN113483388B (en) * | 2021-06-29 | 2022-08-12 | 宁波奥克斯电气股份有限公司 | Air conditioner heat dissipation control method, air conditioner heat dissipation system and air conditioner |
| CN114543384A (en) * | 2021-12-24 | 2022-05-27 | 青岛海尔空调电子有限公司 | Air conditioner |
| CN113993361B (en) * | 2021-12-31 | 2022-04-22 | 天津飞旋科技股份有限公司 | Cooling water unit frequency converter refrigerant cooling system |
| CN115190746A (en) * | 2022-07-15 | 2022-10-14 | 珠海格力电器股份有限公司 | Radiator device, radiator group, variable frequency compressor, air conditioning equipment and method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100001767A (en) * | 2008-06-27 | 2010-01-06 | 엘지전자 주식회사 | Control method of air-conditioner |
| CN104848438A (en) * | 2015-05-20 | 2015-08-19 | 广东志高暖通设备股份有限公司 | Variable frequency air conditioner and radiator of outdoor nit thereof |
| CN105135515A (en) * | 2012-03-30 | 2015-12-09 | 艾默生环境优化技术有限公司 | Heat pump system |
| CN106016505A (en) * | 2016-06-12 | 2016-10-12 | 青岛海尔空调器有限总公司 | Cooling device for air conditioner circuit board |
| CN106288032A (en) * | 2016-08-12 | 2017-01-04 | 青岛海尔空调器有限总公司 | A kind of method utilizing double back air compressor to reduce frequency conversion board chip temperature rise and air-conditioning |
| CN107228455A (en) * | 2017-06-09 | 2017-10-03 | 青岛海尔空调器有限总公司 | A kind of air conditioner and control method |
| CN108548242A (en) * | 2018-03-30 | 2018-09-18 | 青岛海尔空调器有限总公司 | A kind of control method and device of air-conditioning system |
| CN108885017A (en) * | 2016-04-07 | 2018-11-23 | 三菱电机株式会社 | Air-conditioning device |
| CN109539463A (en) * | 2018-11-14 | 2019-03-29 | 珠海格力电器股份有限公司 | Air conditioning system and cooling control method of variable frequency driver of air conditioning system |
| CN110249190A (en) * | 2017-02-10 | 2019-09-17 | 大金工业株式会社 | Heat source unit and air regulator with the heat source unit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101343233B1 (en) * | 2011-11-28 | 2013-12-18 | 삼성전기주식회사 | Power Module Package |
| CN205847813U (en) * | 2016-06-07 | 2016-12-28 | 石家庄赛纳电子科技有限公司 | A kind of radiator structure of power amplifier |
| CN110581110A (en) * | 2019-08-16 | 2019-12-17 | 珠海零边界集成电路有限公司 | Power module assembly |
-
2020
- 2020-02-13 CN CN202010091422.XA patent/CN111256292B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100001767A (en) * | 2008-06-27 | 2010-01-06 | 엘지전자 주식회사 | Control method of air-conditioner |
| CN105135515A (en) * | 2012-03-30 | 2015-12-09 | 艾默生环境优化技术有限公司 | Heat pump system |
| CN104848438A (en) * | 2015-05-20 | 2015-08-19 | 广东志高暖通设备股份有限公司 | Variable frequency air conditioner and radiator of outdoor nit thereof |
| CN108885017A (en) * | 2016-04-07 | 2018-11-23 | 三菱电机株式会社 | Air-conditioning device |
| CN106016505A (en) * | 2016-06-12 | 2016-10-12 | 青岛海尔空调器有限总公司 | Cooling device for air conditioner circuit board |
| CN106288032A (en) * | 2016-08-12 | 2017-01-04 | 青岛海尔空调器有限总公司 | A kind of method utilizing double back air compressor to reduce frequency conversion board chip temperature rise and air-conditioning |
| CN110249190A (en) * | 2017-02-10 | 2019-09-17 | 大金工业株式会社 | Heat source unit and air regulator with the heat source unit |
| CN107228455A (en) * | 2017-06-09 | 2017-10-03 | 青岛海尔空调器有限总公司 | A kind of air conditioner and control method |
| CN108548242A (en) * | 2018-03-30 | 2018-09-18 | 青岛海尔空调器有限总公司 | A kind of control method and device of air-conditioning system |
| CN109539463A (en) * | 2018-11-14 | 2019-03-29 | 珠海格力电器股份有限公司 | Air conditioning system and cooling control method of variable frequency driver of air conditioning system |
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|---|---|
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