CN114484733A - Expansion valve control method and device and air conditioning system - Google Patents

Expansion valve control method and device and air conditioning system Download PDF

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Publication number
CN114484733A
CN114484733A CN202210095846.2A CN202210095846A CN114484733A CN 114484733 A CN114484733 A CN 114484733A CN 202210095846 A CN202210095846 A CN 202210095846A CN 114484733 A CN114484733 A CN 114484733A
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China
Prior art keywords
expansion valve
degree
instruction
heat exchanger
abnormal
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Granted
Application number
CN202210095846.2A
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Chinese (zh)
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CN114484733B (en
Inventor
陈冬
黄春
任小辉
杨东林
张坤坤
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
Original Assignee
Ningbo Aux Electric Co Ltd
Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
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Application filed by Ningbo Aux Electric Co Ltd, Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd filed Critical Ningbo Aux Electric Co Ltd
Priority to CN202210095846.2A priority Critical patent/CN114484733B/en
Publication of CN114484733A publication Critical patent/CN114484733A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/38—Failure diagnosis
    • 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
    • F24F11/83—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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The application provides an expansion valve control method and device and an air conditioning system, and relates to the technical field of air conditioners. According to the expansion valve control method, whether the expansion valve has abnormal risks or not is judged firstly, the opening degree of the expansion valve is adjusted through the first instruction or the second instruction under the condition that the expansion valve has the abnormal risks, whether the expansion valve is abnormal or not is determined through the change condition of the supercooling degree or the superheat degree of the heat exchanger, and whether the control instruction is consistent with the actual action of the expansion valve or not is determined. And if the abnormal condition exists, the command type of the first command or the second command is exchanged, so that the problem that the type of the expansion valve is not matched with the preset control program is solved. The expansion valve control device and the air conditioning system provided by the embodiment of the application can realize the expansion valve control method, and therefore, the expansion valve control device and the air conditioning system also have corresponding beneficial effects.

Description

Expansion valve control method and device and air conditioning system
Technical Field
The invention relates to the technical field of air conditioners, in particular to an expansion valve control method and device and an air conditioning system.
Background
The electronic expansion valve is widely applied to the air conditioning system, but the expansion valves of different manufacturers may have different excitation directions, that is, the controller adopts the same control program to control different types of expansion valves (such as different coils), the actual action directions of the expansion valves are different, and if different types of expansion valves or coils are used in a mixed manner during production or after-sale maintenance and replacement of the valve bodies or coils, or the control program is used in a mixed manner, the control of the air conditioning system is abnormal.
Disclosure of Invention
The invention solves the problem that the control of the air conditioning system is abnormal due to the fact that the type of the expansion valve in the air conditioning system is not matched with a preset control program.
In order to solve the above problem, in a first aspect, the present invention provides an expansion valve control method applied to an air conditioning system, including:
judging whether the expansion valve has abnormal risk or not;
under the condition that the expansion valve is judged to have abnormal risk, the expansion valve is adjusted through a first instruction or a second instruction, and whether the expansion valve is abnormal is determined according to the change condition of the supercooling degree or the superheat degree of the heat exchanger, wherein the current instruction type of the first instruction is an opening increasing instruction, and the current instruction type of the second instruction is an opening decreasing instruction;
and under the condition that the expansion valve is judged to be abnormal, the command types of the first command and the second command are exchanged.
In the embodiment of the application, whether the expansion valve has an abnormal risk or not is judged firstly, the opening degree of the expansion valve is adjusted through the first instruction or the second instruction under the condition that the abnormal risk exists, and whether the expansion valve is abnormal or not is determined through the change condition of the supercooling degree or the superheat degree of the heat exchanger. The abnormality of the expansion valve in the embodiment of the application is mainly that the type of the expansion valve is not matched with the control program, for example, it is desirable to control the opening of the expansion valve to increase through a first instruction (the current instruction type is an opening increasing instruction) to reduce the superheat degree or the supercooling degree of the heat exchanger, but the opening of the expansion valve is smaller in the actual process, and then the change of the superheat degree or the supercooling degree reflected to the heat exchanger is larger and is opposite to the expected change direction. The expansion valve is abnormal, which means that the current command types of the first command and the second command are opposite to the actual performance, and the air conditioning system has control abnormality. In this embodiment, the first command or the second command adjusts the opening degree of the expansion valve, whether the expansion valve is abnormal or not can be determined according to the change condition of the superheat degree or the supercooling degree of the heat exchanger, and if the expansion valve is abnormal, the command type of the first command or the second command is exchanged, that is, the command type of the first command is a command for reducing the opening degree, and the command type of the second command is a command for increasing the opening degree. When the opening degree of the expansion valve needs to be increased, the controller controls the opening degree of the expansion valve to be increased by increasing the opening degree instruction (currently, the second instruction); when the expansion valve opening degree needs to be decreased, the controller controls the expansion valve opening degree to decrease by decreasing the opening degree command (currently, the first command). By exchanging the command types of the first command and the second command, the problem that the type of the expansion valve is not matched with the preset control program is solved.
In an alternative embodiment, the step of determining whether the expansion valve is at risk of abnormality includes:
under the condition of stable working condition, judging whether the opening degree of the expansion valve is a limit opening degree, wherein the limit opening degree comprises a maximum opening degree and a minimum opening degree;
and when the opening degree of the expansion valve is the limit opening degree, judging whether the expansion valve has an abnormal risk or not according to the historical valve adjusting action and the change condition of the supercooling degree or the superheating degree of the heat exchanger corresponding to the historical valve adjusting action.
In this embodiment, if the type of the expansion valve does not match the preset control program, when it is desired to decrease the degree of superheat or the degree of subcooling of the heat exchanger by increasing the opening degree of the expansion valve, the actual opening degree of the expansion valve is decreased, and the degree of superheat or the degree of subcooling of the heat exchanger is increased, so that the degree of superheat or the degree of subcooling of the heat exchanger does not always reach the target value. In this case, the expansion valve is finally adjusted to the limit opening degree. Therefore, it is reasonable and effective to use the expansion valve opening limit as one of the conditions for determining that there is a risk of abnormality in the expansion valve. When the expansion valve is in the limit opening degree, a record can be taken, and whether the expansion valve has an abnormal risk or not can be judged according to the historical valve adjusting action and the change condition of the supercooling degree or the superheat degree of the heat exchanger corresponding to the historical valve adjusting action.
In an optional embodiment, determining whether the expansion valve has an abnormal risk according to the historical valve adjusting action and the change condition of the supercooling degree or the superheat degree of the heat exchanger corresponding to the historical valve adjusting action specifically includes:
in the historical valve adjusting action, if the opening degree of the expansion valve is positively correlated with the supercooling degree or the superheat degree of the heat exchanger, judging that the expansion valve has abnormal risk; and if the opening degree of the expansion valve is in negative correlation with the supercooling degree or the superheat degree of the heat exchanger, judging that the expansion valve has no abnormal risk.
It should be understood that the opening degree of the expansion valve is reduced, and the supercooling degree or the superheat degree of the heat exchanger should be increased; the opening degree of the expansion valve is increased, and the supercooling degree or the superheat degree of the heat exchanger should be decreased. If the historical valve adjusting action and the change situation of the supercooling degree or the superheat degree of the corresponding heat exchanger do not follow the rule, the expansion valve is judged to have abnormal risk, and the method is reasonable and effective.
In an optional embodiment, the heat exchanger comprises an evaporator and a condenser, the superheat degree of the heat exchanger is the superheat degree of the evaporator, and the supercooling degree of the heat exchanger is the supercooling degree of the condenser;
under the condition that the expansion valve is an internal expansion valve under a refrigerating working condition or an external expansion valve under a heating working condition, the supercooling degree or the superheat degree of the heat exchanger is specifically the superheat degree of the evaporator;
and/or under the condition that the expansion valve is an internal expansion valve under a heating working condition or an external expansion valve under a refrigerating working condition, the supercooling degree or the superheat degree of the heat exchanger is specifically the supercooling degree of the condenser.
In an optional embodiment, the step of adjusting the expansion valve through the first instruction or the second instruction and determining whether the expansion valve is abnormal according to the change condition of the supercooling degree or the superheat degree of the heat exchanger includes:
adjusting the expansion valve through a first instruction, and if the supercooling degree or the superheat degree of the heat exchanger is increased, judging that the expansion valve is abnormal;
or adjusting the expansion valve through the second command, and if the supercooling degree or the superheat degree of the heat exchanger is reduced, judging that the expansion valve is abnormal.
In the present embodiment, the opening degree of the expansion valve is decreased, and the supercooling degree or the superheat degree of the heat exchanger should be increased; the opening degree of the expansion valve is increased, and the supercooling degree or the superheat degree of the heat exchanger should be reduced, which is a rule under normal conditions. In the process of determining whether the expansion valve is abnormal, if a first command is used to attempt to increase the opening degree of the expansion valve and reduce the superheat degree or the supercooling degree of the heat exchanger, but the supercooling degree or the superheat degree of the heat exchanger is actually increased (meaning that the opening degree of the expansion valve is actually reduced), it is determined that the expansion valve is abnormal, the first command is actually a command for controlling the opening degree of the expansion valve to be reduced, and the command types of the first command and the second command need to be exchanged to ensure that the command types are consistent with the actual control condition. Similarly, the expansion valve is adjusted through the second instruction, if the supercooling degree or the superheat degree of the heat exchanger is reduced, the expansion valve is judged to be abnormal, and the instruction types of the first instruction and the second instruction need to be exchanged.
In an optional embodiment, before the expansion valve is adjusted through the first instruction or the second instruction, the supercooling degree or the superheat degree of the heat exchanger is acquired as a first detection value after the opening degree of the expansion valve is maintained unchanged for a first duration;
after the expansion valve is adjusted through the first instruction or the second instruction, the opening degree of the expansion valve is maintained unchanged again for the first time length, and then the supercooling degree or the superheat degree of the heat exchanger is obtained to serve as a second detection value;
under the condition that the second detection value is larger than the first detection value, determining that the supercooling degree or the superheat degree of the heat exchanger is increased; in the case where the second detection value is smaller than the first detection value, it is determined that the supercooling degree or the superheat degree of the heat exchanger decreases.
In this embodiment, the opening degree of the expansion valve is maintained unchanged, and the superheat degree or the subcooling degree of the heat exchanger is obtained after the first time duration, so that the superheat degree or the subcooling degree of the heat exchanger can be stabilized, the current opening degree of the expansion valve can be reflected more accurately, and the judgment on the increase or decrease of the superheat degree or the subcooling degree of the heat exchanger is more accurate.
In an optional embodiment, the value range of the first duration is 3-15 min.
In an alternative embodiment, in the step of adjusting the expansion valve by the first command or the second command, the adjustment amount of the expansion valve is 150-300 pls.
In a second aspect, the present invention provides an expansion valve control device for an air conditioning system, comprising:
the risk judgment module is used for judging whether the expansion valve has abnormal risk or not;
the abnormality determining module is used for adjusting the expansion valve through a first instruction or a second instruction under the condition that the expansion valve has an abnormal risk, and determining whether the expansion valve is abnormal or not according to the change condition of the supercooling degree or the superheat degree of the heat exchanger, wherein the current instruction type of the first instruction is an opening degree increasing instruction, and the current instruction type of the second instruction is an opening degree decreasing instruction;
and the adjusting module is used for exchanging the instruction types of the first instruction and the second instruction under the condition that the expansion valve is abnormal.
In a third aspect, the present invention provides an air conditioning system comprising a controller for executing an executable program to implement the expansion valve control method of any of the preceding embodiments.
Drawings
FIG. 1 is a schematic view of an air conditioning system according to an embodiment of the present application;
FIG. 2 is a flow chart of a method for controlling an expansion valve according to an embodiment of the present disclosure;
FIG. 3 is a flow chart illustrating an embodiment of the present invention for determining whether an expansion valve is at risk of abnormality;
FIG. 4 is a schematic illustration of an expansion valve control apparatus according to an embodiment of the present application;
fig. 5 is a block diagram of an air conditioning system according to an embodiment of the present application.
Description of reference numerals: 010-air conditioning systems; 100-indoor unit; 110-indoor heat exchanger; 120-inner machine expansion valve; 200-an outdoor unit; 210-an outdoor heat exchanger; 220-an outer machine expansion valve; 230-a compressor; 240-four-way valve; 300-a controller; 400-a memory; 500-expansion valve control means; 510-risk judgment module; 520-anomaly determination module; 530-an adjustment module; 600-bus.
Detailed Description
In an air conditioning system, after an expansion valve is newly installed, or after a coil of the expansion valve is replaced, or after a new control program is newly recorded, there is a possibility that the type of the expansion valve does not match the preset control program. In some cases, the controller controls the expansion valve opening degree to increase or decrease through two different types of instructions, and in the specific control, the controller selects the instruction type to select the instruction. For example, the instruction type of the first instruction is an opening increasing instruction, the instruction type of the second instruction is an opening decreasing instruction, and when the controller determines that the opening of the expansion valve needs to be increased, the opening increasing instruction (i.e. the first instruction) is selected to control the opening change of the expansion valve; when the controller determines that the expansion valve opening needs to be decreased, a decrease opening command (i.e., a second command) is selected to control the expansion valve opening change. Then, when the preset control program does not match the expansion valve type, there may be a case where the opening degree of the expansion valve is actually decreased when the opening degree of the expansion valve is adjusted using the first command as the instruction to increase the opening degree, and the opening degree of the expansion valve is actually increased when the opening degree of the expansion valve is adjusted using the second command as the instruction to decrease the opening degree. This may be the case when assembling, replacing, repairing the expansion valve due to a mix of expansion valve types, reverse coil mounting, etc. The mismatch between the type of expansion valve and the control program will result in the failure of the air conditioning system to operate properly.
In order to solve the problem that the type of the expansion valve may not be matched with the control program, embodiments of the present application provide an expansion valve control method, which can troubleshoot and solve the problem of abnormal expansion valve, and ensure the normal operation of the air conditioning system. In addition, the embodiment of the application also provides an expansion valve control device and an air conditioning system, which are used for realizing the control method.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a schematic diagram of an air conditioning system 010 according to an embodiment of the present application. As shown in fig. 1, in the embodiment of the present application, an air conditioning system 010 is taken as an example of a multi-split air conditioner, and a method for controlling an expansion valve is described. The structure of the air conditioning system 010 will be described first.
The air conditioning system 010 includes an indoor unit 100 and an outdoor unit 200, and the heat exchanger of the air conditioning system 010 includes an indoor heat exchanger 110 provided in the indoor unit 100 and an outdoor heat exchanger 210 provided in the outdoor unit 200. Air conditioning system 010 also includes a four-way valve 240 and a compressor 230. The indoor heat exchanger 110 and the outdoor heat exchanger 210 are communicated through a pipeline and form a loop for circulating refrigerant. In this embodiment, the air conditioning system 010 further includes expansion valves disposed on the pipelines, and specifically, the expansion valves include an inner expansion valve 120 disposed on the indoor unit 100 and an outer expansion valve 220 disposed on the outdoor unit 200. During heating, the outdoor heat exchanger 210 is an evaporator (in which refrigerant evaporates and absorbs heat), and the indoor heat exchanger 110 is a condenser (in which gaseous refrigerant liquefies and releases heat); in the cooling operation, the indoor heat exchanger 110 is an evaporator, and the outdoor heat exchanger 210 is a condenser. In this embodiment, the air conditioning system 010 may further include related sensors for detecting an indoor ambient temperature, an outdoor ambient temperature, and a degree of superheat of the evaporator. It should be understood that only one indoor unit 100 is shown, and in other embodiments, the air conditioning system 010 may include a plurality of indoor units 100, each indoor unit 100 being provided with a corresponding indoor expansion valve 120. In this embodiment, the air conditioning system 010 further includes a controller 300 capable of controlling the opening degree of the expansion valve by a control command.
FIG. 2 is a flowchart illustrating an expansion valve control method according to an embodiment of the present disclosure. The expansion valve control method provided by the embodiment of the application can be applied to the multi-connected air conditioner. The purpose of the expansion valve control method is to find out the problem that the type of the expansion valve is not matched with a control program (specifically, a command type), and to enable each control command to be matched with the expansion valve by adjusting the command type of the control command. The type mismatch of the expansion valve may be caused by an expansion valve selection, installation, maintenance error or a mix of control procedures. Specifically, the expansion valve control method comprises the following steps:
step S100, judging whether the expansion valve has abnormal risk.
In this embodiment, when the expansion valve is abnormal, the operation parameters of the air conditioning system 010 are usually expressed, and it is first determined whether the expansion valve has an abnormal risk, and if so, the abnormal risk is continuously checked, which is beneficial to improving the checking efficiency.
FIG. 3 is a flowchart illustrating an embodiment of determining whether an expansion valve is at risk of an abnormality. As shown in fig. 3, in an alternative embodiment, step S100 may specifically include:
step S110, under the condition of stable working condition, judging whether the opening degree of the expansion valve is a limit opening degree, wherein the limit opening degree comprises a maximum opening degree and a minimum opening degree;
and step S120, judging whether the expansion valve has abnormal risk or not according to the historical valve adjusting action and the change situation of the supercooling degree or the superheating degree of the heat exchanger corresponding to the historical valve adjusting action when the opening degree of the expansion valve is the limit opening degree.
In this embodiment, if the type of the expansion valve does not match the preset control program, when it is desired to decrease the degree of superheat or the degree of subcooling of the heat exchanger by increasing the opening degree of the expansion valve, the actual opening degree of the expansion valve is decreased, and the degree of superheat or the degree of subcooling of the heat exchanger is increased, so that the degree of superheat or the degree of subcooling of the heat exchanger does not always reach the target value. In this case, the expansion valve will eventually adjust to the limit opening. Therefore, it is reasonable and effective to use the expansion valve opening limit as one of the conditions for determining that there is a risk of abnormality in the expansion valve. When the expansion valve is in the limit opening degree, a record can be taken, and whether the expansion valve has an abnormal risk or not can be judged according to the historical valve adjusting action and the change condition of the supercooling degree or the superheat degree of the heat exchanger corresponding to the historical valve adjusting action.
The step S120 may specifically include the following steps:
in the historical valve adjusting action, if the opening degree of the expansion valve is positively correlated with the supercooling degree or the superheat degree of the heat exchanger, judging that the expansion valve has abnormal risk; and if the opening degree of the expansion valve is in negative correlation with the supercooling degree or the superheat degree of the heat exchanger, judging that the expansion valve has no abnormal risk.
It should be understood that the opening degree of the expansion valve is reduced, and the supercooling degree or the superheat degree of the heat exchanger should be increased; the opening degree of the expansion valve is increased, and the supercooling degree or the superheat degree of the heat exchanger should be decreased. If the historical valve adjusting action and the change situation of the supercooling degree or the superheat degree of the corresponding heat exchanger do not follow the rule, the expansion valve is judged to have abnormal risk, and the method is reasonable and effective.
When an expansion valve is selected for abnormal inspection, the heat exchanger to be detected can be determined according to the following modes:
under the condition that the expansion valve is the inner machine expansion valve 120 under the refrigeration working condition or the outer machine expansion valve 220 under the heating working condition, the supercooling degree or the superheat degree of the selected heat exchanger is specifically the superheat degree of the evaporator;
and/or, in the case that the expansion valve is the indoor unit expansion valve 120 under the heating working condition or the outdoor unit expansion valve 220 under the cooling working condition, the supercooling degree or the superheat degree of the heat exchanger is specifically the supercooling degree of the condenser.
As described above, the evaporators are the indoor heat exchanger 110 in the cooling operation condition and the outdoor heat exchanger 210 in the heating operation condition; the condenser is the outdoor heat exchanger 210 in the cooling operation and the indoor heat exchanger 110 in the heating operation.
And step S200, under the condition that the expansion valve is judged to have abnormal risk, adjusting the expansion valve through a first instruction or a second instruction, and determining whether the expansion valve is abnormal or not according to the change condition of the supercooling degree or the superheat degree of the heat exchanger, wherein the current instruction type of the first instruction is an opening increasing instruction, and the current instruction type of the second instruction is an opening decreasing instruction.
In the present embodiment, the first instruction and the second instruction are set so that the instruction types are always opposite. The current instruction type of the first instruction is an opening increasing instruction, which means that when the controller 300 determines that the opening of the expansion valve needs to be increased, the expansion valve is controlled to adjust the opening by the first instruction; the current command type of the second command is a decrease opening degree command, which means that when the controller 300 determines that it is necessary to decrease the opening degree of the expansion valve, the expansion valve is controlled to adjust the opening degree by the second command. Of course, when the command type is not matched with the type of the expansion valve, and the first command or the second command is used for controlling the expansion valve, the opening degree change opposite to the expected opening degree change occurs, so that the change of the superheat degree or the supercooling degree of the heat exchanger is also opposite to the expected opening degree change. In some embodiments, the controller 300 determines whether the expansion valve needs to be adjusted up or down based on the superheat or subcooling of the heat exchanger.
In the present embodiment, the expansion valve opening degree is decreased, and the supercooling degree or the superheat degree of the heat exchanger should be increased; the opening degree of the expansion valve is increased, and the supercooling degree or the superheat degree of the heat exchanger should be reduced, which is a rule under normal conditions. In the process of determining whether the expansion valve is abnormal, if the first command is used to increase the opening degree of the expansion valve and reduce the degree of superheat or supercooling of the heat exchanger, but the degree of supercooling or the degree of superheat of the heat exchanger actually appears to be increased (meaning that the opening degree of the expansion valve actually becomes smaller), it is determined that the expansion valve is abnormal, and the first command should actually be a command for controlling the opening degree of the expansion valve to be reduced. The instruction types of the first instruction and the second instruction need to be adjusted. Similarly, the expansion valve is adjusted through the second instruction, if the supercooling degree or the superheat degree of the heat exchanger is reduced, the expansion valve is judged to be abnormal, and the instruction types of the first instruction and the second instruction need to be adjusted.
In a specific embodiment, before the expansion valve is adjusted through the first instruction or the second instruction, the opening degree of the expansion valve may be maintained unchanged for a first duration, and then the supercooling degree or the superheat degree of the heat exchanger may be obtained as a first detection value; after the expansion valve is adjusted through the first instruction or the second instruction, the opening degree of the expansion valve is maintained unchanged again for the first time length, and then the supercooling degree or the superheat degree of the heat exchanger is obtained to serve as a second detection value; under the condition that the second detection value is larger than the first detection value, determining that the supercooling degree or the superheat degree of the heat exchanger is increased; in the case where the second detection value is smaller than the first detection value, it is determined that the supercooling degree or the superheat degree of the heat exchanger decreases.
For example, the valve step of the expansion valve is adjusted to be a reference valve step A pls, the first time duration (optionally 3-15 min) is stabilized, and actual data TA of the supercooling degree or the superheat degree of the heat exchanger is recorded; adjusting the valve step to be B pls through a first instruction, wherein B is A + C, C is the number of adjusting steps, then stabilizing the first time length, and recording actual data TB of the supercooling degree or the superheat degree of the heat exchanger; if TB is greater than TA, meaning that the actual change is contrary to the expected change pattern (TB should be less than TA), then it is determined that the expansion valve control is not consistent with the actual actuation direction of the expansion valve, and it can be determined that the expansion valve is abnormal. In an alternative embodiment, in the case that the valve step adjustment range of the expansion valve is 0-480pls (0pls corresponds to the full closing of the expansion valve, 480pls corresponds to the full opening of the expansion valve), the reference valve step a pls may be 100-200 pls, the adjustment step number C may be 100-200 pls, and if the expansion valve with other specifications is adopted, the above parameters may be adjusted in equal proportion.
In step S300, when it is determined that there is an abnormality in the expansion valve, the command types of the first command and the second command are exchanged.
When the expansion valve is abnormal, it means that the command type of the first command and the command type of the second command are wrong, and the command type of the first command and the command type of the second command should be exchanged to ensure that the command is consistent with the action of the expansion valve, so as to ensure that the controller 300 can control the opening degree of the expansion valve to increase or decrease as required.
It should be understood that, in the embodiment of the present application, the air conditioning system 010 may perform an individual check on all expansion valves included in the air conditioning system 010, and after determining that one expansion valve is abnormal, the command type of the control command for the expansion valve may be corrected, while the command type of the control command corresponding to the expansion valve without abnormality remains unchanged. The expansion valve control method provided by the embodiment of the application is not limited to be applied to a multi-connected air conditioner, and in other optional embodiments, the expansion valve control method can also be applied to a common split air conditioner.
Fig. 4 is a schematic diagram of an expansion valve control apparatus 500 according to an embodiment of the present disclosure. As shown in fig. 4, an expansion valve control apparatus 500 according to an embodiment of the present application includes:
a risk judgment module 510, configured to judge whether the expansion valve has an abnormal risk;
an anomaly determination module 520, configured to adjust the expansion valve according to a first instruction or a second instruction when the expansion valve is at an anomaly risk, and determine whether the expansion valve is abnormal according to a change condition of a supercooling degree or a superheat degree of the heat exchanger, where a current instruction type of the first instruction is an opening increasing instruction, and a current instruction type of the second instruction is an opening decreasing instruction;
and an adjusting module 530, configured to, in the case that the expansion valve is abnormal, exchange the instruction types of the first instruction and the second instruction.
The expansion valve control device 500 and the modules included therein may be executable programs, and the executable programs are called by the controller 300 to implement the expansion valve control method provided by the embodiment of the present application. It should be understood that the expansion valve control apparatus 500 may contain more modules, and each module may have more functions. The description of the expansion valve control method in the present application can be referred to for the function implementation manner corresponding to each module, and will not be described herein again.
Fig. 5 is a block diagram of an air conditioning system 010 according to an embodiment of the present application. As shown in fig. 5, the air conditioning system 010 further includes a memory 400 and a bus 600, and the controller 300 is connected to the memory 400 through the bus 600.
The controller 300 may be an integrated circuit chip having signal processing capabilities. The controller 300 may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The methods, steps, and flowchart disclosed in the embodiments of the present application may be implemented or performed.
The memory 400 is used to store a program, such as the expansion valve control device 500 shown in fig. 4. The expansion valve control device 500 includes at least one software function module, which may be stored in the memory 400 in the form of software or firmware (firmware) or solidified in the operating system of the air conditioning system 010, and the controller 300 executes the above program after receiving an execution instruction to implement the expansion valve control method disclosed in the above embodiment. The Memory 400 may be in the form of a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or any other medium capable of storing program codes. In some alternative embodiments, the memory 400 may be integrated with the controller 300, for example, the memory 400 may be integrated with the controller 300 in a chip.
In summary, in the expansion valve control method provided in the embodiment of the present application, it is determined whether the expansion valve has an abnormal risk, and the opening degree of the expansion valve is adjusted by the first instruction or the second instruction under the condition that the expansion valve has the abnormal risk, and whether the expansion valve is abnormal is determined according to the change condition of the supercooling degree or the superheat degree of the heat exchanger. The abnormality of the expansion valve in the embodiment of the application is mainly that the type of the expansion valve is not matched with the control program, for example, it is desirable to control the opening of the expansion valve to increase through a first instruction (the current instruction type is an opening increasing instruction) to reduce the superheat degree or the supercooling degree of the heat exchanger, but the opening of the expansion valve is smaller in the actual process, and then the change of the superheat degree or the supercooling degree reflected to the heat exchanger is larger and is opposite to the expected change direction. The expansion valve is abnormal, which means that the current command types of the first command and the second command are opposite to the actual performance, and the air conditioning system 010 has control abnormality. In this embodiment, the first command or the second command adjusts the opening degree of the expansion valve, whether the expansion valve is abnormal or not can be determined according to the change condition of the superheat degree or the supercooling degree of the heat exchanger, and if the expansion valve is abnormal, the command type of the first command or the second command is exchanged, that is, the command type of the first command is a command for reducing the opening degree, and the command type of the second command is a command for increasing the opening degree. Thus, the two command types are consistent with the actual performance, and when the opening degree of the expansion valve needs to be increased, the controller 300 controls the opening degree of the expansion valve to be increased by increasing the opening degree command (currently, the second command); when it is desired to decrease the expansion valve opening degree, the controller 300 controls the expansion valve opening degree to decrease by decreasing the opening degree command (currently, the first command). By exchanging the command types of the first command and the second command, the problem that the type of the expansion valve is not matched with the preset control program is solved.
The expansion valve control device 500 and the air conditioning system 010 provided by the embodiment of the application can realize the control method, and therefore have corresponding beneficial effects.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. An expansion valve control method is applied to an air conditioning system and is characterized by comprising the following steps:
judging whether the expansion valve has abnormal risk or not;
under the condition that the expansion valve is judged to have the abnormal risk, the expansion valve is adjusted through a first instruction or a second instruction, and whether the expansion valve is abnormal or not is determined according to the change condition of the supercooling degree or the superheat degree of the heat exchanger, wherein the current instruction type of the first instruction is an opening increasing instruction, and the current instruction type of the second instruction is an opening decreasing instruction;
and under the condition that the expansion valve is judged to be abnormal, the command types of the first command and the second command are exchanged.
2. The expansion valve control method according to claim 1, wherein the step of determining whether the expansion valve is at risk of abnormality comprises:
under the condition of stable working condition, judging whether the opening degree of the expansion valve is a limit opening degree, wherein the limit opening degree comprises a maximum opening degree and a minimum opening degree;
and under the condition that the opening degree of the expansion valve is the limit opening degree, judging whether the expansion valve has abnormal risks or not according to historical valve adjusting actions and the change conditions of the supercooling degree or the superheat degree of the heat exchanger corresponding to the historical valve adjusting actions.
3. The expansion valve control method according to claim 2, wherein the determining whether the expansion valve is at an abnormal risk according to the historical valve adjusting action and the change of the degree of supercooling or the degree of superheat of the heat exchanger corresponding to the historical valve adjusting action comprises:
in the historical valve adjusting action, if the opening degree of the expansion valve is positively correlated with the supercooling degree or the superheat degree of the heat exchanger, the expansion valve is judged to have the abnormal risk; and if the opening degree of the expansion valve is in negative correlation with the supercooling degree or the superheat degree of the heat exchanger, judging that the expansion valve has no abnormal risk.
4. The expansion valve control method according to claim 1, wherein the heat exchanger includes an evaporator and a condenser, a degree of superheat of the heat exchanger is a degree of superheat of the evaporator, and a degree of supercooling of the heat exchanger is a degree of supercooling of the condenser;
under the condition that the expansion valve is an internal expansion valve under a refrigerating working condition or an external expansion valve under a heating working condition, the supercooling degree or the superheat degree of the heat exchanger is specifically the superheat degree of the evaporator;
and/or under the condition that the expansion valve is an internal expansion valve under a heating working condition or an external expansion valve under a refrigerating working condition, the supercooling degree or the superheat degree of the heat exchanger is specifically the supercooling degree of the condenser.
5. The expansion valve control method of claim 1, wherein the step of adjusting the expansion valve according to the first command or the second command to determine whether the expansion valve is abnormal according to a change in the degree of subcooling or the degree of superheat of the heat exchanger comprises:
adjusting the expansion valve through the first instruction, and if the supercooling degree or the superheat degree of the heat exchanger is increased, judging that the expansion valve is abnormal;
or adjusting the expansion valve through the second instruction, and if the supercooling degree or the superheat degree of the heat exchanger is reduced, judging that the expansion valve is abnormal.
6. The expansion valve control method of claim 5, wherein the subcooling or superheating of the heat exchanger is obtained as a first detection value after maintaining the opening degree of the expansion valve constant for a first period of time before adjusting the expansion valve by the first or second command; after the expansion valve is adjusted through the first instruction or the second instruction, the opening degree of the expansion valve is maintained unchanged again for the first time length, and then the supercooling degree or the superheat degree of the heat exchanger is obtained to serve as a second detection value;
determining that the supercooling degree or the superheat degree of the heat exchanger increases in the case where the second detection value is larger than the first detection value; and determining that the supercooling degree or the superheat degree of the heat exchanger decreases in the case where the second detection value is smaller than the first detection value.
7. An expansion valve control method according to claim 6, wherein the first period of time is in the range of 3-15 min.
8. The expansion valve control method according to claim 1, wherein the adjustment amount of the expansion valve in the step of adjusting the expansion valve by the first command or the second command is 150 to 300 pls.
9. An expansion valve control device is applied to an air conditioning system and is characterized by comprising:
the risk judgment module is used for judging whether the expansion valve has abnormal risk or not;
the abnormality determining module is used for adjusting the expansion valve through a first instruction or a second instruction under the condition that the expansion valve has the abnormality risk, and determining whether the expansion valve is abnormal or not according to the change condition of the supercooling degree or the superheat degree of the heat exchanger, wherein the current instruction type of the first instruction is an opening increasing instruction, and the current instruction type of the second instruction is an opening decreasing instruction;
and the adjusting module is used for exchanging the instruction types of the first instruction and the second instruction under the condition that the expansion valve is abnormal.
10. An air conditioning system comprising a controller for executing an executable program to implement the expansion valve control method of any of claims 1-8.
CN202210095846.2A 2022-01-26 2022-01-26 Expansion valve control method and device and air conditioning system Active CN114484733B (en)

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