CN113959082B - Control method and device for air conditioner and computer storage medium - Google Patents

Control method and device for air conditioner and computer storage medium Download PDF

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Publication number
CN113959082B
CN113959082B CN202010638726.3A CN202010638726A CN113959082B CN 113959082 B CN113959082 B CN 113959082B CN 202010638726 A CN202010638726 A CN 202010638726A CN 113959082 B CN113959082 B CN 113959082B
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pressure
air
compressor
expansion valve
electronic expansion
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CN113959082A (en
Inventor
王庆仙
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GD Midea Air Conditioning Equipment Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
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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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a control method of an air conditioner, which comprises the following steps: when the air conditioner is in a heating mode, acquiring the air supplementing pressure of an air supplementing port of a compressor, the air returning pressure of an air returning port of the compressor and the exhaust pressure of an exhaust port of the compressor; acquiring a target pressure according to the return air pressure and the exhaust air pressure; and when the air supplementing pressure is larger than the target pressure, increasing the opening degree of the electronic expansion valve. The invention also discloses a control device and a computer storage medium of the air conditioner, wherein the target pressure is calculated through the air return pressure and the exhaust pressure of the compressor, the opening degree of the electronic expansion valve is regulated according to the magnitude relation between the air supplementing pressure and the target pressure, the problem of hydrops caused by overlarge air supplementing pressure is avoided, and the stable operation of the compressor of the air conditioner is ensured.

Description

Control method and device for air conditioner and computer storage medium
Technical Field
The present invention relates to the field of air conditioners, and in particular, to a control method and apparatus for an air conditioner, and a computer storage medium.
Background
When the air conditioner with the jet enthalpy increasing function heats, a flash evaporator is adopted for gas-liquid separation, a part of refrigerant in the flash evaporator is flashed into refrigerant gas with intermediate pressure and is sprayed into a gas supplementing port of a compressor, and the other part of refrigerant in the flash evaporator is supercooled into supercooled liquid with intermediate pressure, the supercooled liquid is evaporated by an outdoor heat exchanger to become refrigerant gas with low temperature and low pressure, the refrigerant gas with low pressure is sprayed into a gas returning port of the compressor, and the refrigerant gas with intermediate pressure and low pressure is mixed while being compressed by the compressor, so that the exhaust capacity of the compressor is improved, and the aim of improving the heating capacity in a low-temperature environment is fulfilled.
The air return pipeline through which the supercooled liquid flows is provided with an electronic expansion valve for adjusting the flow and supercooling degree of the supercooled liquid, and because the flow of the refrigerant entering the flash evaporator is usually fixed, if the opening of the electronic expansion valve is rapidly reduced in a short time, the flow of the refrigerant of the air supplementing pipeline through which the refrigerant gas with intermediate pressure flows is increased, so that the pressure of the refrigerant gas with intermediate pressure is too high, liquid accumulation is possibly generated, the compressor is caused to operate with liquid, and the compressor is damaged.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide a control method and device of an air conditioner and a computer storage medium, and aims to adjust the opening of an electronic expansion valve according to the air supplementing pressure so as to avoid the problem of effusion caused by overlarge air supplementing pressure.
In order to achieve the above object, the present invention provides a control method of an air conditioner, the control method of the air conditioner comprising the steps of:
when the air conditioner is in a heating mode, acquiring the air supplementing pressure of an air supplementing port of a compressor, the air returning pressure of an air returning port of the compressor and the exhaust pressure of an exhaust port of the compressor;
acquiring a target pressure according to the return air pressure and the exhaust air pressure;
and when the air supplementing pressure is larger than the target pressure, increasing the opening degree of the electronic expansion valve.
Optionally, after the step of increasing the opening degree of the electronic expansion valve when the air supply pressure is greater than the target pressure, the method further includes:
and after the opening of the electronic expansion valve is increased for a preset time, returning to execute the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor.
Optionally, after the step of obtaining the target pressure according to the return air pressure and the exhaust air pressure, the method further includes:
and when the air supplementing pressure is smaller than or equal to the target pressure, maintaining the opening degree of the electronic expansion valve unchanged or reducing the opening degree of the electronic expansion valve.
Optionally, after the step of maintaining the opening degree of the electronic expansion valve unchanged or reducing the opening degree of the electronic expansion valve, the control method of the air conditioner further includes:
and after maintaining the opening of the electronic expansion valve for a preset time or reducing the opening of the electronic expansion valve for a preset time, returning to the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor.
Optionally, after the step of acquiring the target pressure according to the return air pressure and the exhaust air pressure, the control method of the air conditioner further includes:
when the air supplementing pressure is larger than the target pressure, acquiring the current opening of the electronic expansion valve;
when the current opening reaches the maximum opening of the electronic expansion valve, reducing the running frequency of the compressor;
and executing the step of increasing the opening degree of the electronic expansion valve when the current opening degree is smaller than the maximum opening degree of the electronic expansion valve.
Optionally, after the step of reducing the operating frequency of the compressor when the current opening reaches the maximum opening of the electronic expansion valve, the method further includes:
after the operation frequency of the compressor is reduced for a preset period of time, returning to the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor;
and maintaining the operating frequency of the compressor unchanged when the air supplementing pressure is less than or equal to the target pressure.
Optionally, after the step of maintaining the operation frequency of the compressor unchanged, the control method of the air conditioner further includes:
and after maintaining the running frequency of the compressor unchanged for a preset period of time, returning to execute the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor.
Optionally, the step of increasing the opening degree of the electronic expansion valve when the air supplementing pressure is greater than the target pressure includes:
when the air supplementing pressure is larger than the target pressure, acquiring a difference value between the air supplementing pressure and the target pressure;
acquiring an opening adjustment value corresponding to the difference value;
and increasing the opening of the electronic expansion valve according to the opening adjustment value.
In addition, in order to achieve the above object, the present invention also provides a control device of an air conditioner, the control device of the air conditioner comprising: the control method comprises the steps of a memory, a processor and a control program of an air conditioner which is stored in the memory and can run on the processor, wherein the control program of the air conditioner is executed by the processor to realize the control method of the air conditioner.
In addition, in order to achieve the above object, the present invention also provides a computer storage medium having stored thereon a control program of an air conditioner, which when executed by a processor, implements the steps of the control method of an air conditioner as described above.
According to the control method, the control device and the computer storage medium of the air conditioner, when the air conditioner is in a heating mode, the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the air exhausting pressure of the air exhausting port of the compressor are obtained, the target pressure is obtained according to the air returning pressure and the air exhausting pressure, and when the air supplementing pressure is larger than the target pressure, the opening of the electronic expansion valve is increased. According to the invention, the target pressure is calculated through the air return pressure and the exhaust pressure of the compressor, the opening degree of the electronic expansion valve is regulated according to the magnitude relation between the air supplementing pressure and the target pressure, the problem of liquid accumulation caused by overlarge air supplementing pressure is avoided, and the stable operation of the compressor of the air conditioner is ensured.
Drawings
FIG. 1 is a schematic diagram of a terminal structure of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a flow chart of an embodiment of a control method of an air conditioner according to the present invention;
FIG. 3 is a flow chart of another embodiment of a control method of an air conditioner according to the present invention;
FIG. 4 is a flow chart illustrating a control method of an air conditioner according to another embodiment of the present invention;
fig. 5 is a schematic diagram of a refrigerant flow direction in the air conditioner according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment of the invention provides a solution, wherein the target pressure is calculated through the air return pressure and the exhaust pressure of the compressor, the opening degree of the electronic expansion valve is adjusted according to the magnitude relation between the air supplementing pressure and the target pressure, the problem of liquid accumulation caused by overlarge air supplementing pressure is avoided, and the stable operation of the compressor of the air conditioner is ensured.
As shown in fig. 1, fig. 1 is a schematic diagram of a terminal structure of a hardware running environment according to an embodiment of the present invention.
The terminal of the embodiment of the invention is an air conditioner.
As shown in fig. 1, the terminal may include: a processor 1001, such as a CPU, a communication bus 1002, a memory 1003. Wherein the communication bus 1002 is used to enable connected communication between these components. The memory 1003 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1003 may alternatively be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the terminal structure shown in fig. 1 is not limiting of the terminal and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
As shown in fig. 1, a control program of an air conditioner may be included in a memory 1003 as a kind of computer storage medium.
In the terminal shown in fig. 1, the processor 1001 may be configured to call a control program of an air conditioner stored in the memory 1003, and perform the following operations:
when the air conditioner is in a heating mode, acquiring the air supplementing pressure of an air supplementing port of a compressor, the air returning pressure of an air returning port of the compressor and the exhaust pressure of an exhaust port of the compressor;
acquiring a target pressure according to the return air pressure and the exhaust air pressure;
and when the air supplementing pressure is larger than the target pressure, increasing the opening degree of the electronic expansion valve.
Further, the processor 1001 may call a control program of the air conditioner stored in the memory 1003, and further perform the following operations:
and after the opening of the electronic expansion valve is increased for a preset time, returning to execute the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor.
Further, the processor 1001 may call a control program of the air conditioner stored in the memory 1003, and further perform the following operations:
and when the air supplementing pressure is smaller than or equal to the target pressure, maintaining the opening degree of the electronic expansion valve unchanged or reducing the opening degree of the electronic expansion valve.
Further, the processor 1001 may call a control program of the air conditioner stored in the memory 1003, and further perform the following operations:
and after maintaining the opening of the electronic expansion valve for a preset time or reducing the opening of the electronic expansion valve for a preset time, returning to the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor.
Further, the processor 1001 may call a control program of the air conditioner stored in the memory 1003, and further perform the following operations:
when the air supplementing pressure is larger than the target pressure, acquiring the current opening of the electronic expansion valve;
when the current opening reaches the maximum opening of the electronic expansion valve, reducing the running frequency of the compressor;
and executing the step of increasing the opening degree of the electronic expansion valve when the current opening degree is smaller than the maximum opening degree of the electronic expansion valve.
Further, the processor 1001 may call a control program of the air conditioner stored in the memory 1003, and further perform the following operations:
after the operation frequency of the compressor is reduced for a preset period of time, returning to the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor;
and maintaining the operating frequency of the compressor unchanged when the air supplementing pressure is less than or equal to the target pressure.
Further, the processor 1001 may call a control program of the air conditioner stored in the memory 1003, and further perform the following operations:
and after maintaining the running frequency of the compressor unchanged for a preset period of time, returning to execute the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor.
Further, the processor 1001 may call a control program of the air conditioner stored in the memory 1003, and further perform the following operations:
when the air supplementing pressure is larger than the target pressure, acquiring a difference value between the air supplementing pressure and the target pressure;
acquiring an opening adjustment value corresponding to the difference value;
and increasing the opening of the electronic expansion valve according to the opening adjustment value.
Referring to fig. 2, in an embodiment, the control method of the air conditioner includes the steps of:
step S10, when the air conditioner is in a heating mode, acquiring the air supplementing pressure of an air supplementing port of a compressor, the air returning pressure of a return air port of the compressor and the exhaust pressure of an exhaust port of the compressor;
in this embodiment, pressure sensors are disposed at the air supply port, the air return port and the air exhaust port of the air conditioner compressor, and are used for detecting the pressure of the refrigerant at corresponding positions. When the air conditioner is in a heating mode, the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port and the exhaust pressure of the exhaust port are obtained through the pressure sensor. Because the refrigerant pressure of the air conditioner is not stable when the air conditioner is just started, the steps of acquiring the air supplementing pressure of the air supplementing port, the air returning pressure of the air returning port and the exhaust pressure of the exhaust port can be executed after the air conditioner is operated in the heating mode for a period of time.
Specifically, as shown in fig. 5, in the heating mode of the air conditioner, refrigerant gas in a high temperature and high pressure state ejected from the air outlet of the compressor enters the indoor unit through the four-way valve, heat is released in the heat exchanger of the indoor unit and condensed into high temperature and high pressure refrigerant liquid, the high temperature and high pressure refrigerant liquid flows to the outdoor unit and throttles into a refrigerant gas-liquid mixture with intermediate pressure under the action of a capillary tube, a throttle valve and other throttling devices of the outdoor unit, the refrigerant gas-liquid mixture with intermediate pressure enters the flash evaporator, a part of refrigerant is flashed into refrigerant gas with intermediate pressure and enters the compressor through the air supplementing port of the compressor, the other part of refrigerant is supercooled into supercooled liquid with intermediate pressure in the flash evaporator, the supercooled liquid with intermediate pressure enters the outdoor heat exchanger after passing through the electronic expansion valve, absorbs heat in the outdoor heat exchanger, is evaporated into refrigerant gas with low temperature and low pressure, enters the compressor through the air return port of the compressor, the compressor compresses the refrigerant gas with low temperature and low pressure into intermediate pressure, the compressed refrigerant gas is mixed with the refrigerant gas with intermediate pressure sprayed from the air supply port of the compressor, and is continuously compressed into refrigerant gas with high temperature and high pressure, and the refrigerant gas is sprayed from the air outlet of the compressor. When the air conditioner operates, the pressure of the refrigerant is gradually changed, if the opening of the electronic expansion valve is rapidly reduced in a short time, the pressure of the refrigerant in the air supplementing pipeline between the flash evaporator and the air supplementing port of the compressor is suddenly increased, liquid accumulation can be generated when the pressure is too high, the compressor operates with liquid, the temperature of the refrigerant is low, and the heating effect of the air conditioner is poor. In one embodiment, in fig. 5, a first pressure sensor may be provided at point a to detect the discharge pressure of the compressor discharge port, a second pressure sensor may be provided at point j to detect the make-up pressure of the compressor make-up port, and a third pressure sensor may be provided at point k to detect the return pressure of the compressor return port.
Step S20, obtaining target pressure according to the return air pressure and the exhaust air pressure;
in this embodiment, after the air supply pressure of the air supply port, the air return pressure of the air return port, and the exhaust pressure of the exhaust port are obtained, the target pressure is calculated from the air return pressure and the exhaust pressure. The target pressure may be used to represent the desired pressure at the compressor's make-up port or the enthalpy of the refrigerant at the desired level needed to enter the compressor through the make-up port.
Alternatively, the target pressure P is calculated at the time of calculating the target pressure m The calculation formula of (c) may be:
P m ＝SQRT((P 1 +0.1)*(P 2 +0.1))-0.1
wherein P is 1 For exhaust pressure, P 2 For the purpose of supplementing the pressure, SQRT refers to square root calculation.
And step S30, when the pressure of the air supplementing is larger than the target pressure, increasing the opening degree of the electronic expansion valve.
In this embodiment, the air supply pressure is compared with the target pressure, and when the air supply pressure is greater than the target pressure, it is indicated that the refrigerant pressure of the air supply pipeline is too high, and liquid accumulation may occur, so that the opening of the electronic expansion valve may be increased, so that the refrigerant flows to the air return pipeline more and enters the compressor through the air return port, and thus, the flow rate of the refrigerant entering the air supply pipeline is reduced, and the refrigerant pressure of the air supply pipeline is also reduced, so that the liquid accumulation is avoided to the greatest extent, and the compressor is damaged.
Optionally, when the pressure of the air supply is smaller than the target pressure, the opening of the electronic expansion valve is reduced, so that the flow rate of the refrigerant entering the air supply pipeline is increased, the supercooling degree of the supercooled liquid supercooled to the intermediate pressure in the flash evaporator and the air suction amount of the compressor are improved, and the heating effect of the air conditioner is improved. And when the pressure of the air supplementing is equal to the target pressure, the opening degree of the electronic expansion valve is kept unchanged. In addition, the minimum opening of the electronic expansion valve can be preset, and the opening of the electronic expansion valve is not continuously reduced when the opening of the electronic expansion valve is reduced to the minimum opening.
Alternatively, when the pressure of the air supply is less than or equal to the target pressure, the opening degree of the electronic expansion valve is maintained unchanged all the time.
Alternatively, when increasing the opening of the electronic expansion valve or decreasing the opening of the electronic expansion valve, a difference between the pressure of the air supply and the target pressure may be obtained, a corresponding opening adjustment value may be determined according to an absolute value of the difference, and the opening of the electronic expansion valve may be adjusted according to the opening adjustment value. The absolute value of the difference value is positively correlated with the opening adjustment value, and when the air supplementing pressure is closer to the target pressure, the opening adjustment of the electronic expansion valve is smaller, so that after the opening adjustment of the electronic expansion valve, the air supplementing pressure is closer to the target pressure, and the heating effect of the air conditioner is improved while the generation of accumulated liquid is avoided.
In the technical scheme disclosed by the embodiment, the target pressure is calculated through the air return pressure and the exhaust pressure of the compressor, the opening degree of the electronic expansion valve is adjusted according to the magnitude relation between the air supplementing pressure and the target pressure, the problem of liquid accumulation caused by overlarge air supplementing pressure is avoided, and the stable operation of the compressor of the air conditioner is ensured.
In another embodiment, as shown in fig. 3, after step S30, on the basis of the embodiment shown in fig. 2, the method further includes:
and step S40, after the opening degree of the electronic expansion valve is increased for a preset time, returning to the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor.
In this embodiment, after the opening of the electronic expansion valve is increased, the refrigerant pressure of each place in the air conditioner gradually changes, after the opening of the electronic expansion valve is increased for a preset period of time, the refrigerant pressure of each place in the air conditioner gradually stabilizes, at this time, the step of acquiring the air supply pressure of the air supply port of the compressor, the air return pressure of the air return port of the compressor and the exhaust pressure of the exhaust port of the compressor may be performed again to redetermine the target pressure, and whether the opening of the electronic expansion valve needs to be adjusted again is determined according to the redetermined target pressure and the redetermined air supply pressure.
Optionally, when the re-acquired air supplementing pressure is smaller than the re-determined target pressure, the opening degree of the electronic expansion valve is reduced, so that the flow rate of the refrigerant entering the air supplementing pipeline is increased, the supercooling degree of the supercooled liquid supercooled to the intermediate pressure in the flash evaporator and the air suction amount of the compressor are increased, and the heating effect of the air conditioner is improved.
Optionally, when the re-acquired air supply pressure is less than or equal to the re-determined target pressure, if the opening of the electronic expansion valve is reduced again, the air supply pressure may be greater than the target pressure, and a problem of liquid accumulation may occur, so that the opening of the electronic expansion valve is not reduced any more, but the opening of the electronic expansion valve is maintained unchanged, and the air conditioner maintains a better heating effect while avoiding liquid accumulation.
Optionally, after maintaining the opening of the electronic expansion valve for a preset time period or reducing the opening of the electronic expansion valve for a preset time period, returning to execute the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor so as to adjust the opening of the electronic expansion valve at regular time, and ensuring that the air supplementing pressure of the air supplementing port of the compressor is always smaller than the target pressure.
In the technical scheme disclosed in the embodiment, after the opening of the electronic expansion valve is increased for a preset period of time, the steps of acquiring the air supplementing pressure, the air returning pressure and the exhaust pressure are performed in a returning mode, and the problem of hydrops caused by the fact that the air supplementing pressure is larger is avoided by detecting the refrigerant pressure for a plurality of times and adjusting the opening of the electronic expansion valve for a plurality of times.
In yet another embodiment, as shown in fig. 4, after step S20, on the basis of any one of the embodiments shown in fig. 2 to 3, the method further includes:
step S01, when the air supplementing pressure is larger than the target pressure, acquiring the current opening of the electronic expansion valve;
step S02, when the current opening reaches the maximum opening of the electronic expansion valve, reducing the operation frequency of the compressor;
in this embodiment, after the target pressure is obtained according to the air return pressure and the exhaust pressure, if the air supply pressure is detected to be greater than the target pressure, the current opening of the electronic expansion valve may be obtained, if the current opening reaches the maximum opening of the electronic expansion valve, which indicates that the air supply pressure cannot be reduced by adjusting the opening of the electronic expansion valve, the exhaust pressure may be reduced by reducing the operating frequency of the compressor, and then the air return pressure and the air supply pressure are affected by the change of the exhaust pressure, and the change of the air supply pressure is generally greater than the air return pressure, so that the purpose of reducing the air supply pressure can be achieved by adjusting the operating frequency of the compressor, and the generation of the liquid accumulation in the air supply pipeline is avoided. The adjustment value of the compressor operating frequency can be determined according to a preliminary test.
Optionally, after the operation frequency of the compressor is reduced for a preset period of time, the step of obtaining the air supply pressure of the air supply port of the compressor, the air return pressure of the air return port of the compressor and the exhaust pressure of the air exhaust port of the compressor is performed in a returning manner, so as to redetermine the target pressure, and whether the operation frequency of the compressor needs to be regulated again is determined according to the redetermined target pressure and the redetermined air supply pressure. If the re-acquired air supplementing pressure is smaller than or equal to the re-determined target pressure, the current operating frequency of the compressor is maintained unchanged, and the influence of the reduction of the operating frequency of the compressor on the heating effect of the air conditioner is reduced as much as possible while the problem of liquid accumulation is avoided. If the re-acquired air supplementing pressure is still greater than the re-determined target pressure, the operation frequency of the compressor is reduced again, and the steps of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor are carried out again until the air supplementing pressure is less than or equal to the target pressure.
Optionally, after maintaining the operation frequency of the compressor for a preset period of time, returning to execute the step of obtaining the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor, so as to adjust the operation frequency of the compressor regularly, and ensure that the air supplementing pressure of the air supplementing port of the compressor is always smaller than the target pressure.
And step S03, when the current opening degree is smaller than the maximum opening degree of the electronic expansion valve, executing the step of increasing the opening degree of the electronic expansion valve.
In this embodiment, if the current opening degree of the electronic expansion valve is smaller than the maximum opening degree of the electronic expansion valve, the step of increasing the opening degree of the electronic expansion valve is performed. And if the increased opening value is larger than the maximum opening of the electronic expansion valve, adjusting the opening of the electronic expansion valve to the maximum opening. And after the opening of the electronic expansion valve is increased for a preset time, returning to execute the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor.
In the technical scheme disclosed in this embodiment, when the air supplementing pressure is greater than the target pressure, the current opening degree of the electronic expansion valve is obtained, when the current opening degree reaches the maximum opening degree of the electronic expansion valve, the operating frequency of the compressor is reduced, when the air supplementing pressure cannot be reduced through the adjustment of the opening degree of the electronic expansion valve, the operating frequency of the compressor is reduced, so as to reduce the air supplementing pressure, avoid the problem of liquid accumulation caused by the overlarge air supplementing pressure, and ensure the stable operation of the air conditioner compressor.
In addition, an embodiment of the present invention further provides a control device of an air conditioner, where the control device of the air conditioner includes: the control method comprises the steps of the control method of the air conditioner, wherein the steps are realized when the control program of the air conditioner is executed by the processor.
In addition, the embodiment of the invention also provides a computer storage medium, wherein the computer storage medium stores a control program of the air conditioner, and the control program of the air conditioner realizes the steps of the control method of the air conditioner in each embodiment when being executed by a processor.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (9)

1. The control method of the air conditioner is characterized by comprising the following steps of:
when the air conditioner is in a heating mode, acquiring the air supplementing pressure of an air supplementing port of a compressor, the air returning pressure of an air returning port of the compressor and the exhaust pressure of an exhaust port of the compressor;
acquiring a target pressure according to the return air pressure and the exhaust air pressure;
when the air supplementing pressure is larger than the target pressure, increasing the opening of an electronic expansion valve, wherein the electronic expansion valve is arranged between a flash evaporator and an evaporator;
after the step of obtaining the target pressure according to the return air pressure and the exhaust air pressure, the control method of the air conditioner further includes:
when the air supplementing pressure is larger than the target pressure, acquiring the current opening of the electronic expansion valve;
when the current opening reaches the maximum opening of the electronic expansion valve, reducing the running frequency of the compressor;
and executing the step of increasing the opening of the electronic expansion valve when the current opening is smaller than the maximum opening of the electronic expansion valve.
2. The method of controlling an air conditioner according to claim 1, wherein after the step of increasing the opening degree of the electronic expansion valve when the air supply pressure is greater than the target pressure, further comprising:
and after the opening of the electronic expansion valve is increased for a preset time, returning to execute the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor.
3. The control method of an air conditioner according to claim 1 or 2, characterized by further comprising, after the step of acquiring a target pressure from the return air pressure and the discharge air pressure:
and when the air supplementing pressure is smaller than or equal to the target pressure, maintaining the opening degree of the electronic expansion valve unchanged or reducing the opening degree of the electronic expansion valve.
4. The control method of an air conditioner according to claim 3, wherein after the step of maintaining the opening degree of the electronic expansion valve unchanged or decreasing the opening degree of the electronic expansion valve, the control method of an air conditioner further comprises:
and after maintaining the opening of the electronic expansion valve for a preset time or reducing the opening of the electronic expansion valve for a preset time, returning to the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor.
5. The method of controlling an air conditioner according to claim 1, wherein after the step of reducing the operating frequency of the compressor when the current opening degree reaches the maximum opening degree of the electronic expansion valve, further comprising:
after the operation frequency of the compressor is reduced for a preset period of time, returning to the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor;
and maintaining the operating frequency of the compressor unchanged when the air supplementing pressure is less than or equal to the target pressure.
6. The method of controlling an air conditioner as set forth in claim 5, wherein after the step of maintaining the operation frequency of the compressor unchanged, the method further comprises:
and after maintaining the running frequency of the compressor unchanged for a preset period of time, returning to execute the step of acquiring the air supplementing pressure of the air supplementing port of the compressor, the air returning pressure of the air returning port of the compressor and the exhaust pressure of the exhaust port of the compressor.
7. The control method of an air conditioner according to claim 1, wherein the step of increasing the opening degree of the electronic expansion valve when the air supply pressure is greater than the target pressure includes:
when the air supplementing pressure is larger than the target pressure, acquiring a difference value between the air supplementing pressure and the target pressure;
acquiring an opening adjustment value corresponding to the difference value;
and increasing the opening of the electronic expansion valve according to the opening adjustment value.
8. A control device of an air conditioner, characterized in that the control device of an air conditioner comprises: a memory, a processor, and a control program of an air conditioner stored on the memory and operable on the processor, which when executed by the processor, realizes the steps of the control method of an air conditioner according to any one of claims 1 to 7.
9. A computer storage medium, wherein a control program of an air conditioner is stored on the computer storage medium, which when executed by a processor, implements the steps of the control method of an air conditioner according to any one of claims 1 to 7.
CN202010638726.3A 2020-07-03 2020-07-03 Control method and device for air conditioner and computer storage medium Active CN113959082B (en)

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