WO2019052035A1 - 多联式空调的控制方法、系统及计算机可读存储介质 - Google Patents
多联式空调的控制方法、系统及计算机可读存储介质 Download PDFInfo
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- WO2019052035A1 WO2019052035A1 PCT/CN2017/115322 CN2017115322W WO2019052035A1 WO 2019052035 A1 WO2019052035 A1 WO 2019052035A1 CN 2017115322 W CN2017115322 W CN 2017115322W WO 2019052035 A1 WO2019052035 A1 WO 2019052035A1
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- outdoor unit
- exhaust temperature
- expansion valve
- average exhaust
- electronic expansion
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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
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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
- F24F11/33—Responding to malfunctions or emergencies to fire, excessive heat or smoke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- 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
-
- 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
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/50—Load
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/60—Energy consumption
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- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/005—Outdoor unit expansion valves
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- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/06—Several compression cycles arranged in parallel
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- 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
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- 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
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
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- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2614—HVAC, heating, ventillation, climate control
Definitions
- the present invention relates to the field of electronic device technologies, and in particular, to a control method for a multi-connected air conditioner, a multi-connected air conditioner system, and a computer readable storage medium.
- Multi-connected air conditioning units are affected by the installation position, installation piping, external machine spacing and drop during actual use, which tends to cause uneven distribution of refrigerant between outdoor units, resulting in outdoor If the machine is running abnormally, the outdoor unit with many refrigerants may return to the liquid, and the outdoor unit with low refrigerant charge may have a high exhaust temperature, which may result in lack of oil and wear. In severe cases, the outdoor unit may be damaged and the compressor may be damaged.
- the outdoor units of different capacities can be distributed by the pipe diameter and the corresponding valve body control method in parallel, and the balance can be achieved as much as possible.
- the pipe diameter is determined.
- the valve body control is exactly the same.
- the main object of the present invention is to provide a control method for a multi-connected air conditioner, a multi-connected air-conditioning system, and a computer-readable storage medium, which are directed to solving the problem of uneven distribution of refrigerant between outdoor units in a multi-connected air-conditioning system. .
- the present invention provides a control method for a multi-connected air conditioner, the multi-connected air conditioner comprising at least two outdoor units, each of the outdoor units including at least one compressor, at least two of the outdoor units
- the machine constitutes an outdoor unit system
- the control method of the multi-connected air conditioner includes the following steps:
- the path of the electronic expansion valve of each of the outdoor units is also performed. Whether the degree of superheat is greater than a second determination of the first preset value, so that the average exhaust of each of the outdoor units is compared when the degree of superheat of the path of the electronic expansion valve of each of the outdoor units is greater than a first preset value
- the temperature is the same as the average exhaust temperature of the outdoor unit system.
- the corresponding electronic expansion valve action is controlled according to the result of the magnitude of the average exhaust gas temperature of each of the outdoor units and the average exhaust gas temperature of the outdoor unit system, including:
- the control method of the multi-connected air conditioner of the present invention detects whether the superheat degree of each of the outdoor units reaches the target requirement; and when the superheat degree of each of the outdoor units reaches the target requirement, the average row of each of the outdoor units is performed.
- a second determination is made as to whether the superheat degree of the path of the electronic expansion valve of each of the outdoor units is greater than a first preset value; and the path of each electronic expansion valve of the outdoor unit is performed
- the superheat degree is greater than the first preset value, and the average exhaust gas temperature of each of the outdoor units is greater than the third judgment of the average exhaust gas temperature of the outdoor unit system; when the third determination result is “Yes”, the installation is increased.
- the opening degree of the electronic expansion valve is described; when the third determination result is "NO", the opening degree of the electronic expansion valve is reduced.
- the method of the invention solves the problem of uneven distribution of refrigerant in the multi-connected air conditioning system, in particular, realizes effective control of controlling the opening degree of the injection electronic expansion valve in the multi-connected air conditioning system of the injection enhancement.
- the exhaust temperature of the system is described; when the third determination result is "NO", the opening degree of the electronic expansion valve is reduced.
- the multi-connected air conditioner includes two outdoor units; the corresponding electronic control is performed according to a result of a magnitude of an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system
- the step of the expansion valve operating such that the average exhaust temperature of each of the outdoor units approaches the average exhaust temperature of the outdoor unit system includes:
- the electronic expansion valve is controlled to increase the opening degree based on the current opening degree.
- the multi-connected air conditioner includes two outdoor units; the corresponding electronic control is performed according to a result of a magnitude of an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system
- the step of the expansion valve operating such that the average exhaust temperature of each of the outdoor units approaches the average exhaust temperature of the outdoor unit system includes:
- the electronic expansion valve When the opening degree of the electronic expansion valve is greater than the minimum opening degree, the electronic expansion valve is controlled to reduce the opening degree on the basis of the current opening degree.
- the respective electronic expansion valve actions are controlled according to the magnitude of the average exhaust gas temperature of each of the outdoor units and the magnitude of the average exhaust gas temperature of the outdoor unit system to make each of the outdoor units
- the step of the average exhaust gas temperature approaching the average exhaust gas temperature of the outdoor unit system includes:
- the electronic expansion valve is controlled to increase the opening degree based on the current opening degree.
- the respective electronic expansion valve actions are controlled according to the magnitude of the average exhaust gas temperature of each of the outdoor units and the magnitude of the average exhaust gas temperature of the outdoor unit system to make each of the outdoor units
- the step of the average exhaust gas temperature approaching the average exhaust gas temperature of the outdoor unit system includes:
- the electronic expansion valve When the opening degree of the electronic expansion valve is greater than the minimum opening degree, the electronic expansion valve is controlled to reduce the opening degree on the basis of the current opening degree.
- the step of detecting whether the superheat of each of the outdoor units reaches a target requirement comprises:
- the step of determining whether a difference between an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system reaches a preset value comprises:
- the method further comprises:
- the step of increasing the opening degree of the corresponding electronic expansion valve comprises:
- the electronic expansion valve of the outdoor unit When the opening degree of the electronic expansion valve of the outdoor unit is less than the maximum opening degree, the electronic expansion valve is controlled to increase the opening degree based on the current opening degree.
- the step of reducing the opening degree of the corresponding electronic expansion valve comprises:
- the electronic expansion valve of the outdoor unit When the opening degree of the electronic expansion valve of the outdoor unit is greater than the minimum opening degree, the electronic expansion valve is controlled to reduce the opening degree based on the current opening degree.
- the method further includes:
- the present invention further provides a multi-connected air conditioning system, the multi-connected air conditioning system comprising at least two outdoor units, each of the outdoor units including at least one compressor, at least two of the outdoor units
- the machine constitutes an outdoor unit system; the outdoor unit further includes a reversing valve, an outdoor heat exchanger, a gas-liquid separator, an electronic expansion valve, a high-pressure shut-off valve, and a low-pressure shut-off valve connected to the outdoor unit pipeline;
- the air conditioning system further includes: a memory, a processor, and a control program of the multi-connected air conditioner stored on the memory and operable on the processor, the control program of the multi-connected air conditioner being executed by the processor The steps of the method as described above are implemented.
- the present invention further provides a computer readable storage medium, wherein the computer readable storage medium stores a control program of a multi-connected air conditioner, and a control program of the multi-connected air conditioner The steps of the control method of the multi-connected air conditioner as described above when executed by the processor.
- the control method of the multi-connected air conditioner of the present invention determines whether the superheat degree of each of the outdoor units reaches the target requirement; and when the superheat degree of each of the outdoor units reaches the target requirement, determining the average row of each of the outdoor units Whether the difference between the gas temperature and the average exhaust temperature of the outdoor unit system reaches a preset value; the difference between the average exhaust temperature of each of the outdoor units and the average exhaust temperature of the outdoor unit system reaches a pre-predetermined value Setting a value, comparing an average exhaust temperature of each of the outdoor units with an average exhaust temperature of the outdoor unit system; and an outdoor unit system according to an average exhaust temperature of each of the outdoor units As a result of the magnitude of the average exhaust temperature, the electronic expansion valve is actuated to bring the average exhaust temperature of each of the outdoor units close to the average exhaust temperature of the outdoor unit system.
- FIG. 1 is a schematic structural view of a multi-connected air conditioning system according to an embodiment of the present invention
- FIG. 1A is a schematic structural view of a multi-connected air conditioning system according to another embodiment of the present invention.
- FIG. 2 is a schematic flow chart of a first embodiment of a method for controlling a multi-connected air conditioner according to the present invention
- FIG. 2A is a schematic flow chart of a first embodiment of a method for controlling a multi-connected air conditioner according to another aspect of the present invention
- FIG. 3 is a schematic flow chart of a second embodiment of a control method for a multi-connected air conditioner according to the present invention.
- FIG. 4 is a schematic flow chart of a third embodiment of a control method for a multi-connected air conditioner according to the present invention.
- FIG. 4A is a schematic flow chart of a third embodiment of a method for controlling a multi-connected air conditioner according to another aspect of the present invention.
- FIG. 5 is a schematic flow chart of a fourth embodiment of a method for controlling a multi-connected air conditioner according to the present invention.
- 5A is a schematic flow chart of a fourth embodiment of a method for controlling a multi-connected air conditioner according to another aspect of the present invention.
- FIG. 6 is a schematic flow chart of a fifth embodiment of a method for controlling a multi-connected air conditioner according to the present invention.
- FIG. 7 is a schematic flow chart of a sixth embodiment of a method for controlling a multi-connected air conditioner according to the present invention.
- FIG. 8 is a schematic flow chart of a seventh embodiment of a method for controlling a multi-connected air conditioner according to the present invention.
- FIG. 9 is a schematic flow chart of an embodiment of a method for controlling a multi-connected air conditioner according to the present invention.
- Figure 10 is a schematic block diagram of a multi-connected air conditioning system of the present invention.
- the present invention provides a control method for a multi-connected air conditioner, which is applied to the multi-connected air conditioning system.
- the multi-connected air conditioning system includes at least two parallel outdoor units and at least two parallel indoor units, the indoor units and the outdoor units are connected in series one by one; the outdoor units include one, two or more
- the compressor 10 constitutes a compressor unit; the pipeline structure of the outdoor unit includes a gas-liquid separator 20, a compressor unit, an outdoor heat exchanger 30, a reversing valve 40, an electronic expansion valve 50, a high-pressure shut-off valve 60, and a low-pressure shut-off valve 70.
- the reversing valve 40 is a four-way valve.
- the connection mode of the outdoor unit pipeline is a conventional connection manner in the art, as shown in FIG. 1 , and details are not described herein again.
- control method of the multi-connected air conditioner includes the following steps:
- Step S10 detecting whether the superheat of each of the outdoor units reaches a target requirement
- the superheat of each of the outdoor units reaches a target requirement to determine whether the compressor of each of the outdoor units is in a normal working state.
- the superheat degree of the outdoor unit is higher than the target value, the resistance of the pipeline through which the refrigerant flows is different or the load in the room is different, so that the superheat of the outdoor unit is too high, and the compressor of the outdoor unit is overloaded. status.
- the flux of the refrigerant should be adjusted first so that the superheat of the outdoor unit reaches the target value.
- the refrigerant may flow into the compressor in a gas-liquid two-phase state, causing damage to the compressor; therefore, it is necessary to first reduce the refrigerant flux of the compressor. In order to prevent the refrigerant from flowing into the compressor with the gas-liquid two-phase refrigerant, damage to the entire system. Only when the superheat of each of the outdoor units reaches the target requirement, the next step is continued. Otherwise, the superheat of the compressor must be adjusted to meet the target requirements.
- Step S20 determining, when the superheat degree of each of the outdoor units reaches the target requirement, whether a difference between an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system reaches a preset value;
- the superheat degree of each of the outdoor units reaches the target requirement, it is further determined whether a difference between an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system reaches a preset value.
- the preset value may be set as needed, and when the difference between the average exhaust temperature of each of the outdoor units and the average exhaust temperature of the outdoor unit system is within a preset value, it indicates that each time The average exhaust temperature of the outdoor unit is not much different from the average exhaust temperature of the outdoor unit system, and is within an acceptable fluctuation range. Therefore, it is not necessary to adjust the operation of the outdoor unit at this time.
- the difference between the average exhaust temperature of each outdoor unit and the average exhaust temperature of the outdoor unit system exceeds a preset value, it indicates that the average exhaust temperature of each outdoor unit deviates from the average exhaust of the outdoor unit system at this time.
- the higher temperature may affect the normal operation of the outdoor unit, so measures need to be taken to adjust the exhaust temperature to the average exhaust temperature of the outdoor unit system.
- Step S30 comparing an average exhaust temperature of each of the outdoor units to the predetermined value when a difference between an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system reaches a preset value The average exhaust temperature of the outdoor unit system;
- the exhaust gas temperature of the compressor of each of the outdoor units is obtained, and the average exhaust gas temperature of the outdoor unit system is calculated.
- the average exhaust temperature of each of the outdoor units is the exhaust temperature of all the compressors in each of the outdoor units The average of degrees.
- the average exhaust temperatures of the three outdoor units are set to TP1, TP2, and TP3.
- Each outdoor unit includes two compressors.
- the exhaust temperatures of the compressors are TP1C1, TP1C2, and TP2C1.
- TP2 (TP2C1+TP2C2)/2
- TP3 (TP3C1+TP3C2)/2.
- Step S40 controlling the electronic expansion valve to operate according to the magnitude of the average exhaust temperature of each of the outdoor units and the average exhaust temperature of the outdoor unit system to make the average row of each of the outdoor units The gas temperature is close to the average exhaust temperature of the outdoor unit system.
- the average exhaust gas temperature of each of the outdoor units obtained according to the calculation is compared with each other.
- the average exhaust temperatures calculated by the two outdoor units can be directly compared with each other, and the outdoor unit having a high average exhaust temperature is adjusted to increase the opening degree of the electronic expansion valve. Increasing the refrigerant therein, thereby reducing the exhaust temperature; the outdoor unit having a low average exhaust gas temperature reduces the opening degree of the electronic expansion valve to reduce the refrigerant therein, thereby raising the exhaust gas thereof. temperature.
- the method of comparing two or two is more complicated.
- the average exhaust temperature of the entire outdoor unit system can be calculated directly according to the average exhaust temperature of each outdoor unit, and then each The average exhaust temperature of the outdoor unit is compared with the average exhaust temperature of the outdoor unit system, and the opening degree of the electronic expansion valve is adjusted according to the size thereof so that the exhaust temperature of the outdoor unit approaches the average exhaust of the entire outdoor unit system. temperature.
- the average distribution of refrigerant throughout the outdoor unit system components is achieved.
- the average exhaust temperature of the outdoor unit and calculate the average exhaust temperature of the outdoor unit system; compare the average exhaust temperature of each of the outdoor units with the average exhaust temperature of the outdoor unit system Controlling the electronic expansion valve to operate such that the average exhaust temperature of each of the outdoor units is controlled according to a magnitude of an average exhaust temperature of each of the outdoor units and a magnitude of an average exhaust temperature of the outdoor unit system Approaching the average exhaust temperature of the outdoor unit system.
- the step S40 includes:
- Step S41a determining whether the opening degree of the electronic expansion valve of the outdoor unit having the high average exhaust gas temperature among the two outdoor units is Less than the maximum opening;
- Step S41b when the opening degree of the electronic expansion valve is less than the maximum opening degree, controlling the electronic expansion valve to increase the opening degree based on the current opening degree.
- the outdoor unit of the multi-connected air conditioner has only two units.
- the average exhaust temperature of the two outdoor units can be directly compared to control the opening degree of the electronic expansion valve.
- the average exhaust temperatures of the two outdoor units are calculated, and the average exhaust temperature of the two outdoor units is compared. It is further determined whether the current opening degree of the electronic expansion valve of the outdoor unit having the relatively large average exhaust gas temperature has reached the maximum opening degree that can be achieved. When the electronic expansion valve reaches the maximum opening degree that can be reached, it indicates that the electronic expansion valve can no longer increase the opening degree. Therefore, the electronic expansion valve can be continuously controlled to increase the opening degree only when the current opening degree of the electronic expansion valve has not reached the maximum opening degree.
- the electronic expansion valve is controlled to increase the opening degree based on the current opening degree to increase the refrigerant flow rate of the compressor of the outdoor unit to reduce the exhaust gas temperature thereof.
- the average exhaust temperature of the two outdoor units is directly compared, and it is determined whether the opening of the electronic expansion valve of the outdoor unit with the higher average exhaust gas reaches the maximum opening degree, and further It is judged whether the electronic expansion valve can continue to be opened. Improves the accuracy of electronic expansion valve control, and also protects the electronic expansion valve and the entire system.
- the step S40 includes:
- Step S42a determining whether the opening degree of the electronic expansion valve of the outdoor unit having the average exhaust gas temperature of the two outdoor units is greater than the minimum opening degree
- step S42b when the opening degree of the electronic expansion valve is greater than the minimum opening degree, the electronic expansion valve is controlled to reduce the opening degree on the basis of the current opening degree.
- the outdoor unit of the multi-connected air conditioner has only two units.
- the average exhaust temperature of the two outdoor units can be directly compared to control the opening degree of the electronic expansion valve.
- the average exhaust temperatures of the two outdoor units are calculated, and the average exhaust temperature of the two outdoor units is compared. It is further determined whether the current opening degree of the electronic expansion valve of the outdoor unit having the relatively small average exhaust gas temperature has reached the minimum opening degree that can be achieved. When the electronic expansion valve reaches the minimum opening that it can reach, it indicates that the electronic expansion valve can no longer reduce the opening degree. Therefore, the electronic expansion valve can be continuously controlled to reduce the opening degree only when the current opening degree of the electronic expansion valve has not reached the minimum opening degree.
- the electronic expansion valve is controlled to reduce the opening degree on the basis of the current opening degree to reduce the refrigerant flow rate of the compressor of the outdoor unit to increase the exhaust gas temperature thereof.
- the average exhaust temperature of the two outdoor units is directly compared, and it is determined whether the opening degree of the electronic expansion valve of the outdoor unit with the lower average exhaust gas reaches the minimum opening degree, and further It is judged whether the electronic expansion valve can continue to be opened. Improves the accuracy of electronic expansion valve control, and also protects the electronic expansion valve and the entire system.
- the step S40 includes:
- Step S43a determining whether the average exhaust gas temperature of the outdoor unit is higher than the average opening temperature of the outdoor unit corresponding to the outdoor unit temperature, and whether the opening degree of the electronic expansion valve of the outdoor unit is greater than the maximum opening degree;
- step S43b when the opening degree of the electronic expansion valve is less than the maximum opening degree, the electronic expansion valve is controlled to increase the opening degree based on the current opening degree.
- the opening degree of the electronic expansion valve is controlled by judging the relationship between the average exhaust temperature of the outdoor unit and the average exhaust temperature of the outdoor unit system.
- the average exhaust gas temperature of each of the outdoor units and the average exhaust gas temperature of the outdoor unit system are first determined.
- the average exhaust temperature of the outdoor unit is greater than the average exhaust temperature of the outdoor unit system, it is detected whether the electronic expansion valve of the outdoor unit reaches its maximum opening degree.
- the electronic expansion valve is controlled to increase the opening degree based on the current opening degree to increase the refrigerant flow rate of the compressor of the outdoor unit to lower the exhaust gas temperature thereof.
- the outdoor unit in the embodiment may be two, three, or three or more, which is not limited herein.
- the opening degree of the electronic expansion valve is controlled by comparing the average exhaust gas temperature of the outdoor unit with the average exhaust gas temperature of the outdoor unit system, and the distribution of the refrigerant in the entire multi-connected air conditioning system is effectively realized.
- the step S40 includes:
- Step S44a determining whether the average exhaust gas temperature of the outdoor unit is lower than the average opening temperature of the outdoor unit system, and whether the opening degree of the electronic expansion valve of the outdoor unit is greater than a minimum opening degree;
- Step S44b when the opening degree of the electronic expansion valve is greater than the minimum opening degree, controlling the electronic expansion valve to reduce the opening degree on the basis of the current opening degree.
- the opening degree of the electronic expansion valve is controlled by judging the relationship between the average exhaust temperature of the outdoor unit and the average exhaust temperature of the outdoor unit system.
- the average exhaust gas temperature of each of the outdoor units and the average exhaust gas temperature of the outdoor unit system are first determined. Detecting the outdoor unit when the average exhaust temperature of the outdoor unit is greater than the average exhaust temperature of the outdoor unit system Whether the electronic expansion valve reaches its maximum opening. When it is detected that the electronic expansion valve has not reached the maximum opening degree, the electronic expansion valve is controlled to increase the opening degree based on the current opening degree to increase the refrigerant flow rate of the compressor of the outdoor unit to lower the exhaust gas temperature thereof.
- the outdoor unit in the embodiment may be two, three, or three or more, which is not limited herein.
- the opening degree of the electronic expansion valve is controlled by comparing the average exhaust gas temperature of the outdoor unit with the average exhaust gas temperature of the outdoor unit system, and the distribution of the refrigerant in the entire multi-connected air conditioning system is effectively realized.
- step S10 includes:
- Step S11 acquiring an exhaust temperature of each of the outdoor units
- Step S12 obtaining the lowest exhaust gas temperature in all the outdoor units according to the obtained exhaust gas temperature comparison
- Step S13 detecting whether the superheat of the outdoor unit corresponding to the lowest exhaust temperature reaches the target requirement.
- the exhaust gas temperature of each of the outdoor units is obtained, and then the lowest exhaust gas temperature among all exhaust gas temperatures is obtained according to the obtained exhaust gas temperature comparison, and the outdoor air temperature corresponding to the lowest exhaust gas temperature is further determined. Whether the superheat of the machine meets the target requirements. If the superheat of the outdoor unit corresponding to the lowest exhaust temperature can meet the target requirement, it indicates that the other exhaust gas temperature is higher than the superheat of the outdoor unit corresponding to the minimum exhaust temperature. Therefore, it is only necessary to determine whether the superheat of the outdoor unit corresponding to the lowest exhaust temperature has reached the target requirement.
- the outdoor unit corresponding to the lowest exhaust temperature by obtaining the lowest exhaust gas temperature among the exhaust temperatures of all the outdoor units, and determining whether the superheat of the outdoor unit corresponding to the lowest exhaust temperature reaches the target requirement, the outdoor unit corresponding to the lowest exhaust temperature When the superheat degree reaches the target requirement, it can be judged that the superheat of other outdoor units can reach the target requirement. It is not necessary to judge the superheat of all outdoor units, which improves the operation efficiency.
- the step S20 includes:
- Step S21 acquiring an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system
- Step S22 obtaining an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system according to an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system.
- step S23 it is determined whether the absolute value reaches a preset value.
- the average exhaust temperature of the outdoor unit and the average row of the outdoor unit system are determined before the step of determining the average exhaust temperature of each of the outdoor units and the average exhaust temperature of the outdoor unit system. Difference between gas temperatures Whether the absolute value reaches the preset value. If the preset value is not reached, it indicates that the average exhaust temperature of the outdoor unit is not much different from the average exhaust temperature of the outdoor unit system, and the difference between the two is within a range that can fluctuate. The absolute value of the difference between the average exhaust temperature of the compressor of the outdoor unit and the average exhaust temperature of the outdoor unit system reaches a preset value, and the average exhaust temperature of the outdoor unit is determined to be the average of the outdoor unit system. Judgment of the size of the exhaust gas temperature.
- the preset range may be set according to a system requirement, and the preset range may cause an average exhaust temperature of each outdoor unit to have a fluctuation value in a range of upper and lower ranges of the average exhaust temperature of the outdoor unit system. To ensure the reliability of system control.
- the method further includes:
- Step S00 acquiring an exhaust temperature of each of the outdoor units
- Step S01 determining whether the exhaust temperature of the compressor of each of the outdoor units is within a preset range
- step S02 when the exhaust temperature of the compressor of the outdoor unit exceeds a preset range, a fault signal is issued.
- the exhaust gas temperature of the compressor of each of the outdoor units is obtained. Further, it is determined whether the exhaust temperature of the compressor of each outdoor unit is within a preset range, and when the exhaust temperature of the compressor exceeds a preset range, a fault signal is issued.
- the preset range is the exhaust temperature range under normal working conditions of the compressor, and can be set according to the actual situation of the system.
- the present invention further provides a multi-connected air conditioning system, see FIG. 10 and FIG. 1, the method is applied to the multi-connected air conditioning system, the multi-connected air conditioning system includes at least two parallel outdoor units and at least Two parallel indoor units, the indoor unit and the outdoor unit are connected in series one by one; the outdoor unit includes one, two or more compressors 10 to form a compressor unit; the pipeline structure of the outdoor unit includes The gas-liquid separator 20, the compressor unit, the outdoor heat exchanger 30, the reversing valve 40, the electronic expansion valve 50, the high pressure shutoff valve 60, and the low pressure shutoff valve 70; the reversing valve 40 is a four-way valve.
- the connection mode of the outdoor unit pipeline is a conventional connection manner in the art, as shown in FIG.
- the multi-connected air conditioning system 100 further includes a memory 101, a processor 102, and a control program of the multi-connected air conditioner stored on the memory 101 and operable on the processor 102, the multi-connected air conditioner
- the control program is executed by the processor 102 to implement the steps of the method as described below:
- the superheat of each of the outdoor units reaches a target requirement to determine whether the compressor of each of the outdoor units is in a normal working state.
- the resistance of the pipeline through which the refrigerant flows is different or the load in the room is different, which causes the superheat of the outdoor unit to be too high, so that the compressor of the outdoor unit is super Load status.
- the flux of the refrigerant should be adjusted first so that the superheat of the outdoor unit reaches the target value.
- the refrigerant may flow into the compressor in a gas-liquid two-phase state, causing damage to the compressor; therefore, it is necessary to first reduce the refrigerant flux of the compressor. In order to prevent the refrigerant from flowing into the compressor with the gas-liquid two-phase refrigerant, damage to the entire system. Only when the superheat of each of the outdoor units reaches the target requirement, the next step is continued. Otherwise, the superheat of the compressor must be adjusted to meet the target requirements.
- the superheat degree of each of the outdoor units reaches the target requirement, it is further determined whether a difference between an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system reaches a preset value.
- the preset value may be set as needed, and when the difference between the average exhaust temperature of each of the outdoor units and the average exhaust temperature of the outdoor unit system is within a preset value, it indicates that each time The average exhaust temperature of the outdoor unit is not much different from the average exhaust temperature of the outdoor unit system, and is within an acceptable fluctuation range. Therefore, it is not necessary to adjust the operation of the outdoor unit at this time.
- the difference between the average exhaust temperature of each outdoor unit and the average exhaust temperature of the outdoor unit system exceeds a preset value, it indicates that the average exhaust temperature of each outdoor unit deviates from the average exhaust of the outdoor unit system at this time.
- the higher temperature may affect the normal operation of the outdoor unit, so measures need to be taken to adjust the exhaust temperature to the average exhaust temperature of the outdoor unit system.
- the exhaust gas temperature of the compressor of each of the outdoor units is obtained, and the average exhaust gas temperature of the outdoor unit system is calculated.
- the average exhaust gas temperature of each of the outdoor units is an average value of exhaust temperatures of all the compressors in each of the outdoor units.
- the average exhaust temperatures of the three outdoor units are set to TP1, TP2, and TP3.
- Each outdoor unit includes two compressors.
- the exhaust temperatures of the compressors are TP1C1, TP1C2, and TP2C1.
- TP2 (TP2C1+TP2C2)/2
- TP3 (TP3C1+TP3C2)/2.
- the average exhaust gas temperature of each of the outdoor units obtained according to the calculation is compared with each other. Specifically, when there are only two outdoor units, the average exhaust temperatures calculated by the two outdoor units can be directly compared with each other, and the outdoor unit having a high average exhaust temperature is adjusted to increase the opening degree of the electronic expansion valve. Increase the refrigerant inside, thereby reducing its exhaust temperature The outdoor unit with a low average exhaust gas temperature reduces the opening of the electronic expansion valve to reduce the refrigerant therein, thereby increasing the exhaust temperature.
- the method of comparing two or two is more complicated.
- the average exhaust temperature of the entire outdoor unit system can be calculated directly according to the average exhaust temperature of each outdoor unit, and then each The average exhaust temperature of the outdoor unit is compared with the average exhaust temperature of the outdoor unit system, and the opening degree of the electronic expansion valve is adjusted according to the size thereof so that the exhaust temperature of the outdoor unit approaches the average exhaust of the entire outdoor unit system. temperature.
- the average distribution of refrigerant throughout the outdoor unit system components is achieved.
- the problem of uneven distribution of refrigerant in the multi-connected air-conditioning system is solved by the method of the embodiment, and in particular, the control of the opening of the electronic expansion valve is effectively controlled in the multi-connected air-conditioning system of the injection-enhanced air conditioner.
- the exhaust temperature of the system is solved by the method of the embodiment, and in particular, the control of the opening of the electronic expansion valve is effectively controlled in the multi-connected air-conditioning system of the injection-enhanced air conditioner.
- control program of the multi-connected air conditioner when executed by the processor, the following method steps are implemented:
- the electronic expansion valve is controlled to increase the opening degree based on the current opening degree.
- the outdoor unit of the multi-connected air conditioner has only two units.
- the average exhaust temperature of the two outdoor units can be directly compared to control the opening degree of the electronic expansion valve.
- the average exhaust temperatures of the two outdoor units are calculated, and the average exhaust temperature of the two outdoor units is compared. It is further determined whether the current opening degree of the electronic expansion valve of the outdoor unit having the relatively large average exhaust gas temperature has reached the maximum opening degree that can be achieved. When the electronic expansion valve reaches the maximum opening degree that can be reached, it indicates that the electronic expansion valve can no longer increase the opening degree. Therefore, the electronic expansion valve can be continuously controlled to increase the opening degree only when the current opening degree of the electronic expansion valve has not reached the maximum opening degree.
- the electronic expansion valve is controlled to increase the opening degree based on the current opening degree to increase the refrigerant flow rate of the compressor of the outdoor unit to reduce the exhaust gas temperature thereof.
- the average exhaust temperature of the two outdoor units is directly compared, and it is determined whether the opening of the electronic expansion valve of the outdoor unit with the higher average exhaust gas reaches the maximum opening degree, and further It is judged whether the electronic expansion valve can continue to be opened.
- improves the accuracy of electronic expansion valve control, as well as electronic expansion valves and the entire The system plays a protective role.
- control program of the multi-connected air conditioner when executed by the processor, the following method steps are implemented:
- the electronic expansion valve When the opening degree of the electronic expansion valve is greater than the minimum opening degree, the electronic expansion valve is controlled to reduce the opening degree on the basis of the current opening degree.
- the outdoor unit of the multi-connected air conditioner has only two units.
- the average exhaust temperature of the two outdoor units can be directly compared to control the opening degree of the electronic expansion valve.
- the average exhaust temperatures of the two outdoor units are calculated, and the average exhaust temperature of the two outdoor units is compared. It is further determined whether the current opening degree of the electronic expansion valve of the outdoor unit having the relatively small average exhaust gas temperature has reached the minimum opening degree that can be achieved. When the electronic expansion valve reaches the minimum opening that it can reach, it indicates that the electronic expansion valve can no longer reduce the opening degree. Therefore, the electronic expansion valve can be continuously controlled to reduce the opening degree only when the current opening degree of the electronic expansion valve has not reached the minimum opening degree.
- the electronic expansion valve is controlled to reduce the opening degree on the basis of the current opening degree to reduce the refrigerant flow rate of the compressor of the outdoor unit to increase the exhaust gas temperature thereof.
- the average exhaust temperature of the two outdoor units is directly compared, and it is determined whether the opening degree of the electronic expansion valve of the outdoor unit with the lower average exhaust gas reaches the minimum opening degree, and further It is judged whether the electronic expansion valve can continue to be opened. Improves the accuracy of electronic expansion valve control, and also protects the electronic expansion valve and the entire system.
- control program of the multi-connected air conditioner when executed by the processor, the following method steps are implemented:
- the electronic expansion valve is controlled to increase the opening degree based on the current opening degree.
- the opening degree of the electronic expansion valve is controlled by judging the relationship between the average exhaust temperature of the outdoor unit and the average exhaust temperature of the outdoor unit system.
- the average exhaust gas temperature of each of the outdoor units and the average exhaust gas temperature of the outdoor unit system are first determined.
- the average exhaust temperature of the outdoor unit is greater than the average exhaust temperature of the outdoor unit system, it is detected whether the electronic expansion valve of the outdoor unit reaches its maximum opening degree.
- Control electronics when it is detected that the electronic expansion valve has not reached the maximum opening
- the expansion valve increases the opening degree based on the current opening degree to increase the refrigerant flow rate of the compressor of the outdoor unit to lower the exhaust gas temperature thereof.
- the outdoor unit in the embodiment may be two, three, or three or more, which is not limited herein.
- the opening degree of the electronic expansion valve is controlled by comparing the average exhaust gas temperature of the outdoor unit with the average exhaust gas temperature of the outdoor unit system, and the distribution of the refrigerant in the entire multi-connected air conditioning system is effectively realized.
- control program of the multi-connected air conditioner when executed by the processor, the following method steps are implemented:
- the electronic expansion valve When the opening degree of the electronic expansion valve is greater than the minimum opening degree, the electronic expansion valve is controlled to reduce the opening degree on the basis of the current opening degree.
- the opening degree of the electronic expansion valve is controlled by judging the relationship between the average exhaust temperature of the outdoor unit and the average exhaust temperature of the outdoor unit system.
- the average exhaust gas temperature of each of the outdoor units and the average exhaust gas temperature of the outdoor unit system are first determined.
- the average exhaust temperature of the outdoor unit is greater than the average exhaust temperature of the outdoor unit system, it is detected whether the electronic expansion valve of the outdoor unit reaches its maximum opening degree.
- the electronic expansion valve is controlled to increase the opening degree based on the current opening degree to increase the refrigerant flow rate of the compressor of the outdoor unit to lower the exhaust gas temperature thereof.
- the outdoor unit in the embodiment may be two, three, or three or more, which is not limited herein.
- the opening degree of the electronic expansion valve is controlled by comparing the average exhaust gas temperature of the outdoor unit with the average exhaust gas temperature of the outdoor unit system, and the distribution of the refrigerant in the entire multi-connected air conditioning system is effectively realized.
- control program of the multi-connected air conditioner when executed by the processor, the following method steps are implemented:
- the exhaust gas temperature of each of the outdoor units is obtained, and then the lowest exhaust gas temperature among all exhaust gas temperatures is obtained according to the obtained exhaust gas temperature comparison, and the outdoor air temperature corresponding to the lowest exhaust gas temperature is further determined. Whether the superheat of the machine meets the target requirements. If the superheat of the outdoor unit corresponding to the lowest exhaust temperature can meet the target requirement, then the table It can be achieved that the other exhaust gas temperature is higher than the superheat of the outdoor unit corresponding to the minimum exhaust temperature. Therefore, it is only necessary to determine whether the superheat of the outdoor unit corresponding to the lowest exhaust temperature has reached the target requirement.
- the outdoor unit corresponding to the lowest exhaust temperature by obtaining the lowest exhaust gas temperature among the exhaust temperatures of all the outdoor units, and determining whether the superheat of the outdoor unit corresponding to the lowest exhaust temperature reaches the target requirement, the outdoor unit corresponding to the lowest exhaust temperature When the superheat degree reaches the target requirement, it can be judged that the superheat of other outdoor units can reach the target requirement. It is not necessary to judge the superheat of all outdoor units, which improves the operation efficiency.
- control program of the multi-connected air conditioner when executed by the processor, the following method steps are implemented:
- the average exhaust temperature of the outdoor unit and the average row of the outdoor unit system are determined before the step of determining the average exhaust temperature of each of the outdoor units and the average exhaust temperature of the outdoor unit system. Whether the absolute value of the difference between the gas temperatures reaches a preset value. If the preset value is not reached, it indicates that the average exhaust temperature of the outdoor unit is not much different from the average exhaust temperature of the outdoor unit system, and the difference between the two is within a range that can fluctuate. The absolute value of the difference between the average exhaust temperature of the compressor of the outdoor unit and the average exhaust temperature of the outdoor unit system reaches a preset value, and the average exhaust temperature of the outdoor unit is determined to be the average of the outdoor unit system. Judgment of the size of the exhaust gas temperature.
- the preset range may be set according to a system requirement, and the preset range may cause an average exhaust temperature of each outdoor unit to have a fluctuation value in a range of upper and lower ranges of the average exhaust temperature of the outdoor unit system. To ensure the reliability of system control.
- the embodiment of the present invention further provides a computer readable storage medium, where the control program of the multi-connected air conditioner is stored, and the control program of the multi-connected air conditioner is implemented by the processor to implement the above The method steps described in the examples.
- a method of controlling a multi-connected air conditioner comprising at least two parallel outdoor units And at least two parallel indoor units, wherein the indoor unit and the outdoor unit are connected in series;
- the pipeline structure of the outdoor unit includes a gas-liquid separator 20, a compressor unit, an outdoor heat exchanger 30, and a commutation
- the reversing valve is a four-way valve.
- the connection mode of the outdoor unit pipeline is a conventional connection manner in the art, as shown in FIG. 1A, and details are not described herein again.
- the multi-connected air conditioner in this embodiment is a jet-enhanced
- the compressor in the compressor group is a jet booster compressor.
- the electronic expansion valve includes an injection electronic expansion valve 601 and a conventional electronic expansion valve 50.
- the opening degree of the control electronic expansion valve described in this embodiment means that the opening degree of the injection electronic expansion valve 601 is controlled.
- control method of the multi-connected air conditioner includes the following steps:
- Step S110 detecting whether the superheat degree of each of the outdoor units reaches a target requirement
- the superheat of each of the outdoor units reaches a target requirement to determine whether the compressor of each of the outdoor units is in a normal working state.
- the superheat degree of the outdoor unit is higher than the target value, the resistance of the pipeline through which the refrigerant flows is different or the load in the room is different, so that the superheat of the outdoor unit is too high, and the compressor of the outdoor unit is overloaded. status.
- the flux of the refrigerant should be adjusted first so that the superheat of the outdoor unit reaches the target value.
- the refrigerant may flow into the compressor in a gas-liquid two-phase state, causing damage to the compressor; therefore, it is necessary to first reduce the refrigerant flux of the compressor. In order to prevent the refrigerant from flowing into the compressor with the gas-liquid two-phase refrigerant, damage to the entire system. Only when the superheat of each of the outdoor units reaches the target requirement, the next step is continued. Otherwise, the superheat of the compressor must be adjusted to meet the target requirements.
- Step S120 when the superheat degree of each of the outdoor units reaches the target requirement, whether the difference between the average exhaust temperature of each of the outdoor units and the average exhaust temperature of the outdoor unit system reaches a preset value First judgment
- the superheat degree of each of the outdoor units reaches the target requirement, it is further determined whether a difference between an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system reaches a preset value.
- the preset value may be set as needed, and when the difference between the average exhaust temperature of each of the outdoor units and the average exhaust temperature of the outdoor unit system is within a preset value, it indicates that each time The average exhaust temperature of the outdoor unit is not much different from the average exhaust temperature of the outdoor unit system, and is within an acceptable fluctuation range. Therefore, it is not necessary to adjust the operation of the outdoor unit at this time.
- the difference between the average exhaust temperature of each outdoor unit and the average exhaust temperature of the outdoor unit system exceeds a preset value, it indicates that the average exhaust temperature of each outdoor unit deviates from the average exhaust of the outdoor unit system at this time.
- the higher temperature may affect the normal operation of the outdoor unit, so measures need to be taken to adjust the exhaust temperature to the average exhaust temperature of the outdoor unit system.
- Step S130 when the difference between the average exhaust temperature of each of the outdoor units and the average exhaust temperature of the outdoor unit system reaches a preset value, the path of the electronic expansion valve of each of the outdoor units is performed. Whether the heat is greater than the second determination of the first preset value;
- the first preset value defines a state in which the injection electronic expansion valve is in an operable state, that is, the opening degree of the injection electronic expansion valve can be adjusted when the injection electronic expansion valve is greater than the first preset value.
- the superheat degree of the injection electronic expansion valve is defined as follows: Referring to FIG. 1A, the temperatures T1 and T2 detected at the injection electronic expansion valve and the pressure are used to calculate the superheat degree of the passage in which the injection electronic expansion valve is located.
- Step S140 in which the superheat degree of the path where the electronic expansion valve of the outdoor unit is located is greater than a first preset value, and whether the average exhaust temperature of each of the outdoor units is greater than the average exhaust temperature of the outdoor unit system Three judgments;
- determining whether the average exhaust temperature of each of the outdoor units is greater than the average exhaust temperature of the outdoor unit system is to separately determine the average exhaust temperature of each outdoor unit and the average exhaust of the outdoor unit system. The temperature of each outdoor unit is judged to be independent. Moreover, as long as the difference between the average exhaust temperature of the outdoor unit and the average exhaust temperature of the outdoor unit system reaches a preset value, it is determined that the outdoor unit needs to be adjusted so that its average exhaust temperature tends to the average of the outdoor unit system. Exhaust gas temperature.
- the average exhaust gas temperature of each of the outdoor units is an average value of exhaust temperatures of compressors in each of the outdoor units.
- the average exhaust temperatures of the three outdoor units are set to TP1, TP2, and TP3.
- Each outdoor unit includes two compressors.
- the exhaust temperatures of the compressors are TP1C1, TP1C2, and TP2C1.
- TP2 (TP2C1+TP2C2)/2
- TP3 (TP3C1+TP3C2)/2.
- step S150 when the third determination result is "Yes”, the opening degree of the corresponding electronic expansion valve is increased; when the third determination result is "No", the opening degree of the corresponding electronic expansion valve is decreased.
- the processing result of the above is processed as follows: the third determination result is “Yes”, that is, the average exhaust temperature of the outdoor unit is greater than the average exhaust temperature of the outdoor unit system, and this indicates that the The average exhaust temperature of the outdoor unit is higher than the exhaust temperature of the entire outdoor unit system, indicating that the refrigerant of the outdoor unit is less at this time, and then the flux of the refrigerant needs to be increased. In this case, it is further determined whether the superheat of the path of the injection electronic expansion valve reaches a first preset value.
- the superheat of the path of the injection electronic expansion valve does not reach the first preset value, since the refrigerant flowing through the injection electronic expansion valve is directly sprayed back to the compressor, if the superheat degree at the injection electronic expansion valve is not the first Within a predetermined value, if opening the injection electronic expansion valve at this time may cause the refrigerant to flow into the compressor in a liquid form, it will cause the compressor to accumulate, which will damage the compressor.
- the injection electronic expansion valve before opening the injection electronic expansion valve, it is determined whether the path of the injection electronic expansion valve reaches a first preset value, and when the injection electronic expansion valve reaches a first preset value, the injection electronic expansion valve is controlled at the current The opening degree is increased by a predetermined opening degree to increase the refrigerant flowing into the compressor of the outdoor unit from here, thereby lowering the exhaust temperature of the compressor of the outdoor unit.
- the third determination is "NO"
- the average exhaust temperature of the outdoor unit is smaller than that of the outdoor unit system.
- the exhaust temperature is average, it indicates that the exhaust temperature of the compressor of the outdoor unit is too low, that is, the refrigerant of the outdoor unit has a large amount of refrigerant, so it is necessary to reduce the compressor of the outdoor unit by controlling the valve. Refrigerant flow.
- the opening degree of the injection electronic expansion valve is reduced on the basis of the current opening degree of the injection electronic expansion valve, thereby reducing the flow rate of the refrigerant flowing into the compressor of the outdoor unit.
- the refrigerant of the compressor of the outdoor unit can be controlled by controlling the opening degree of the conventional electronic expansion valve on the main road. Flow, or control the frequency of the compressor to balance the exhaust temperature of the compressor.
- the setting of the first preset value of the superheat degree of the path where the injection electronic expansion valve is located in the embodiment may be changed according to the change of the ambient temperature, and the first preset value is set.
- the standard is generally greater than 5 ° C, which can be set as needed.
- the superheat degree of the path where the injection electronic expansion valve is located does not reach the first preset value
- the problem of uneven distribution of refrigerant in the multi-connected air-conditioning system is solved by the method of the embodiment, and in particular, in the multi-connected air-conditioning system of the injection-enhanced air-conditioning system, by controlling the opening degree of the injection electronic expansion valve, it is effective Controls the exhaust temperature of the system.
- the step S110 includes:
- Step S11 acquiring an exhaust temperature of each of the outdoor units
- Step S12 obtaining the lowest exhaust gas temperature in all the outdoor units according to the obtained exhaust gas temperature comparison
- Step S13 detecting whether the superheat of the outdoor unit corresponding to the lowest exhaust temperature reaches the target requirement.
- the exhaust gas temperature of each of the outdoor units is obtained, and then the lowest exhaust gas temperature among all exhaust gas temperatures is obtained according to the obtained exhaust gas temperature comparison, and the outdoor air temperature corresponding to the lowest exhaust gas temperature is further determined. Whether the superheat of the machine meets the target requirements. If the superheat of the outdoor unit corresponding to the lowest exhaust temperature can meet the target requirement, it indicates that the other exhaust gas temperature is higher than the superheat of the outdoor unit corresponding to the minimum exhaust temperature. Therefore, it is only necessary to determine whether the superheat of the outdoor unit corresponding to the lowest exhaust temperature has reached the target requirement.
- the outdoor unit corresponding to the lowest exhaust temperature by obtaining the lowest exhaust gas temperature among the exhaust temperatures of all the outdoor units, and determining whether the superheat of the outdoor unit corresponding to the lowest exhaust temperature reaches the target requirement, the outdoor unit corresponding to the lowest exhaust temperature When the superheat degree reaches the target requirement, it can be judged that the superheat of other outdoor units can reach the target requirement. It is not necessary to judge the superheat of all outdoor units, which improves the operation efficiency.
- the step S120 includes:
- Step S21 acquiring an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system
- Step S22 obtaining an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system according to an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system.
- step S23 it is determined whether the absolute value reaches a preset value.
- the average exhaust temperature of the outdoor unit and the average row of the outdoor unit system are determined before the step of determining the average exhaust temperature of each of the outdoor units and the average exhaust temperature of the outdoor unit system. Whether the absolute value of the difference between the gas temperatures reaches a preset value. If the preset value is not reached, it indicates that the average exhaust temperature of the outdoor unit is not much different from the average exhaust temperature of the outdoor unit system, and the difference between the two is within a range that can fluctuate. The absolute value of the difference between the average exhaust temperature of the compressor of the outdoor unit and the average exhaust temperature of the outdoor unit system reaches a preset value, and the average exhaust temperature of the outdoor unit is determined to be the average of the outdoor unit system. Judgment of the size of the exhaust gas temperature.
- the preset range may be set according to a system requirement, and the preset range may cause an average exhaust temperature of each outdoor unit to have a fluctuation value in a range of upper and lower ranges of the average exhaust temperature of the outdoor unit system. To ensure the stability of system control.
- the step S150 further includes:
- Step S51 when the third determination result is "Yes", it is determined whether the opening degree of the electronic expansion valve of the outdoor unit is less than the maximum opening degree;
- Step S52 controlling the electronic expansion valve when the opening degree of the electronic expansion valve of the outdoor unit is less than the maximum opening degree Increase the opening on the basis of the current opening.
- the injection electronic expansion valve when the average exhaust temperature of the compressor of the outdoor unit is higher than the average exhaust temperature of the outdoor unit system, and the superheat degree of the path of the injection electronic expansion valve is greater than the first preset value, Then it is further determined whether the current opening degree of the injection electronic expansion valve has reached the maximum opening degree that can be achieved. When the injection electronic expansion valve reaches the maximum opening degree that can be reached, it indicates that the injection electronic expansion valve can no longer increase the opening degree. Therefore, the injection electronic expansion valve can be continuously controlled to increase the opening degree only when the current opening degree of the injection electronic expansion valve has not reached the maximum opening degree.
- the injection electronic expansion valve is controlled to increase the opening degree based on the current opening degree to increase the refrigerant flow rate of the compressor of the outdoor unit to reduce the discharge thereof. Gas temperature.
- the injection electronic expansion valve it is judged whether the injection electronic expansion valve can continue to be opened by determining whether the opening degree of the injection electronic expansion valve reaches the maximum opening degree.
- the accuracy of the control of the injection electronic expansion valve is improved, and the injection electronic expansion valve and the entire system are also protected.
- the method further includes:
- Step S53 when the third determination result is "No", it is determined whether the opening degree of the electronic expansion valve of the outdoor unit is greater than a minimum opening degree;
- step S54 when the opening degree of the electronic expansion valve of the outdoor unit is greater than the minimum opening degree, the electronic expansion valve is controlled to decrease the opening degree based on the current opening degree.
- the injection electronic expansion valve when the average exhaust temperature of the compressor of the outdoor unit is less than the average exhaust temperature of the outdoor unit system, and the superheat degree of the path of the injection electronic expansion valve is greater than the first preset value, It is further determined whether the current opening degree of the injection electronic expansion valve has reached the minimum opening degree that can be achieved. When the injection electronic expansion valve reaches the minimum opening degree that can be achieved, it indicates that the injection electronic expansion valve can no longer reduce the opening degree. Therefore, the injection electronic expansion valve can be continuously controlled to reduce the opening degree only when the current opening degree of the injection electronic expansion valve has not reached the minimum opening degree.
- the injection electronic expansion valve is controlled to increase the opening degree based on the current opening degree to increase the refrigerant flow rate of the compressor of the outdoor unit to reduce the discharge thereof. Gas temperature.
- the injection electronic expansion valve it is judged whether the injection electronic expansion valve can continue to be closed by determining whether the opening degree of the injection electronic expansion valve reaches the minimum opening degree.
- the accuracy of the control of the injection electronic expansion valve is improved, and the injection electronic expansion valve and the entire system are also protected.
- the method further includes:
- Step S00 acquiring an exhaust temperature of each of the outdoor units
- Step S01 determining whether the exhaust temperature of the compressor of each of the outdoor units is within a preset range
- step S02 when the exhaust temperature of the compressor of the outdoor unit exceeds a preset range, a fault signal is issued.
- the exhaust gas temperature of the compressor of each of the outdoor units is obtained. Further judge each outdoor unit Whether the exhaust temperature of the compressor is within a preset range, and when the exhaust temperature of the compressor exceeds a preset range, a fault signal is issued.
- the preset range is the exhaust temperature range under normal working conditions of the compressor, and can be set according to the actual situation of the system.
- the present invention further provides another multi-connected air conditioning system 100.
- the multi-connected air conditioning system includes at least two outdoor units, each of which includes at least one compressor 10, at least two
- the outdoor unit constitutes an outdoor unit system; the outdoor unit further includes a reversing valve 40 connected to the outdoor unit line, a gas-liquid separator 20, an outdoor heat exchanger 30, an electronic expansion valve, a high pressure cut-off valve 60, and a low pressure
- the shutoff valve 70; the reversing valve is a four-way valve.
- the connection mode of the outdoor unit pipeline is a conventional connection manner in the art, as shown in FIG. 1A, and details are not described herein again.
- the multi-connected air conditioner in this embodiment is a jet-enhanced system
- the compressor in the compressor group is a jet-enhanced compressor.
- the electronic expansion valve includes an injection electronic expansion valve 601 and a conventional electronic expansion valve 50.
- the multi-connected air conditioning system 100 further includes a memory 101, a processor 102, and a control program of the multi-connected air conditioner stored on the memory 101 and operable on the processor 102, the multi-connected air conditioner The control program is executed by the processor 102 to implement the steps of the method as described below
- the superheat of each of the outdoor units reaches a target requirement to determine whether the compressor of each of the outdoor units is in a normal working state.
- the superheat degree of the outdoor unit is higher than the target value, the resistance of the pipeline through which the refrigerant flows is different or the load in the room is different, so that the superheat of the outdoor unit is too high, and the compressor of the outdoor unit is overloaded. status.
- the flux of the refrigerant should be adjusted first so that the superheat of the outdoor unit reaches the target value.
- the refrigerant may flow into the compressor in a gas-liquid two-phase state, causing damage to the compressor; therefore, it is necessary to first reduce the refrigerant flux of the compressor. In order to avoid the refrigerant from gas and liquid The phase refrigerant flows into the compressor, causing damage to the entire system. Only when the superheat of each of the outdoor units reaches the target requirement, the next step is continued. Otherwise, the superheat of the compressor must be adjusted to meet the target requirements.
- the superheat degree of each of the outdoor units reaches the target requirement, it is further determined whether a difference between an average exhaust temperature of each of the outdoor units and an average exhaust temperature of the outdoor unit system reaches a preset value.
- the preset value may be set as needed, and when the difference between the average exhaust temperature of each of the outdoor units and the average exhaust temperature of the outdoor unit system is within a preset value, it indicates that each time The average exhaust temperature of the outdoor unit is not much different from the average exhaust temperature of the outdoor unit system, and is within an acceptable dialing range. At this time, it is not necessary to adjust the operation of the outdoor unit.
- the difference between the average exhaust temperature of each outdoor unit and the average exhaust temperature of the outdoor unit system exceeds a preset value, it indicates that the average exhaust temperature of each outdoor unit deviates from the average exhaust of the outdoor unit system at this time.
- the higher temperature may affect the normal operation of the outdoor unit, so measures need to be taken to adjust the exhaust temperature to the average exhaust temperature of the outdoor unit system.
- the first preset value defines a state in which the injection electronic expansion valve is in an operable state, that is, the opening degree of the injection electronic expansion valve can be adjusted when the injection electronic expansion valve is greater than the first preset value.
- the superheat degree of the injection electronic expansion valve is defined as follows: Referring to FIG. 1A, the temperatures T1 and T2 detected at the injection electronic expansion valve and the pressure are used to calculate the superheat degree of the passage in which the injection electronic expansion valve is located.
- determining whether the average exhaust temperature of each of the outdoor units is greater than the average exhaust temperature of the outdoor unit system is to separately determine the average exhaust temperature of each outdoor unit and the average exhaust of the outdoor unit system. The temperature of each outdoor unit is judged to be independent. Moreover, as long as the difference between the average exhaust temperature of the outdoor unit and the average exhaust temperature of the outdoor unit system reaches a preset value, it is determined that the outdoor unit needs to be adjusted so that its average exhaust temperature tends to the average of the outdoor unit system. Exhaust gas temperature.
- the average exhaust gas temperature of each of the outdoor units is an average value of exhaust temperatures of compressors in each of the outdoor units.
- the average exhaust temperatures of the three outdoor units are set to TP1, TP2, and TP3.
- Each outdoor unit includes two compressors.
- the exhaust temperatures of the compressors are TP1C1, TP1C2, and TP2C1.
- TP2 (TP2C1+TP2C2)/2
- TP3 (TP3C1+TP3C2)/2.
- the processing result of the above is processed as follows: the third determination result is "Yes", that is, the outdoor unit is flat.
- the exhaust gas temperature is greater than the average exhaust gas temperature of the outdoor unit system.
- the average exhaust gas temperature of the outdoor unit is higher than the exhaust temperature of the entire outdoor unit system, indicating that the outdoor unit is at this time. If the refrigerant is too small, then it is necessary to increase the flux of the refrigerant. In this case, it is further determined whether the superheat of the path of the injection electronic expansion valve reaches a first preset value.
- the compressor When the superheat of the path of the injection electronic expansion valve does not reach the first preset value, since the refrigerant flowing in the injection electronic expansion valve is directly injected back to the compressor, if the superheat at the injection electronic expansion valve is not Within the first preset value, if opening the injection electronic expansion valve may cause the refrigerant to flow into the compressor in a liquid form, the compressor will be caused to accumulate and damage the compressor.
- the injection electronic expansion valve before opening the injection electronic expansion valve, it is determined whether the path of the injection electronic expansion valve reaches a first preset value, and when the injection electronic expansion valve reaches a first preset value, the injection electronic expansion valve is controlled at the current
- the opening degree is increased by a preset opening degree to increase the refrigerant flowing into the compressor of the outdoor unit from here to lower the exhaust temperature of the compressor of the outdoor unit.
- the third determination is "NO" that is, when the average exhaust temperature of the outdoor unit is smaller than the average exhaust temperature of the outdoor unit system, it indicates that the exhaust temperature of the compressor of the outdoor unit is too low at this time. That is, the compressor of the outdoor unit has a large amount of refrigerant, and therefore it is necessary to reduce the refrigerant flow rate of the compressor of the outdoor unit by controlling the valve.
- the opening degree of the injection electronic expansion valve is reduced on the basis of the current opening degree of the injection electronic expansion valve, thereby reducing the flow rate of the refrigerant flowing into the compressor of the outdoor unit.
- the refrigerant of the compressor of the outdoor unit can be controlled by controlling the opening degree of the conventional electronic expansion valve on the main road. Flow, or control the frequency of the compressor to balance the exhaust temperature of the compressor.
- the setting of the first preset value of the superheat degree of the path where the injection electronic expansion valve is located in the embodiment may be changed according to the change of the ambient temperature, and the first preset value is set.
- the standard is generally greater than 5 ° C, which can be set as needed.
- the superheat degree of the path where the injection electronic expansion valve is located does not reach the first preset value
- the superheat degree is greater than a second determination of the first preset value
- the superheat degree of each path of the electronic expansion valve in which the outdoor unit is performed is greater than a first preset value, and the average exhaust temperature of each of the outdoor units Whether it is greater than the third judgment of the average exhaust gas temperature of the outdoor unit system; when the third determination result is "Yes", the opening degree of the electronic expansion valve is increased; when the third determination result is "No", the reduction is decreased.
- the opening degree of the electronic expansion valve The problem of uneven distribution of refrigerant in the multi-connected air-conditioning system is solved by the method of the embodiment, and in particular, in the multi-connected air-conditioning system of the injection-enhanced air-conditioning system, by controlling the opening degree of the injection electronic expansion valve, it is effective Controls the exhaust temperature of the system.
- control program of the multi-connected air conditioner when executed by the processor 102, the following method steps are implemented:
- the exhaust gas temperature of each of the outdoor units is obtained, and then the lowest exhaust gas temperature among all exhaust gas temperatures is obtained according to the obtained exhaust gas temperature comparison, and the outdoor air temperature corresponding to the lowest exhaust gas temperature is further determined. Whether the superheat of the machine meets the target requirements. If the superheat of the outdoor unit corresponding to the lowest exhaust temperature can meet the target requirement, it indicates that the other exhaust gas temperature is higher than the superheat of the outdoor unit corresponding to the minimum exhaust temperature. Therefore, it is only necessary to determine whether the superheat of the outdoor unit corresponding to the lowest exhaust temperature has reached the target requirement.
- each of the outdoor units refers to the exhaust temperature of all the outdoor units of each outdoor unit, and the lowest row is compared from the exhaust temperatures of all the outdoor units. Gas temperature.
- the outdoor unit corresponding to the lowest exhaust temperature by obtaining the lowest exhaust gas temperature among the exhaust temperatures of all the outdoor units, and determining whether the superheat of the outdoor unit corresponding to the lowest exhaust temperature reaches the target requirement, the outdoor unit corresponding to the lowest exhaust temperature When the superheat degree reaches the target requirement, it can be judged that the superheat of other outdoor units can reach the target requirement. It is not necessary to judge the superheat of all outdoor units, which improves the operation efficiency.
- control program of the multi-connected air conditioner when executed by the processor 102, the following method steps are implemented:
- the average exhaust temperature of the outdoor unit and the average row of the outdoor unit system are determined before the step of determining the average exhaust temperature of each of the outdoor units and the average exhaust temperature of the outdoor unit system. Whether the absolute value of the difference between the gas temperatures reaches a preset value. If the preset value is not reached, it indicates the average exhaust temperature of the outdoor unit and the outdoor unit. The average exhaust temperature of the system is not much different, and the difference between the two is within the range that can fluctuate. The absolute value of the difference between the average exhaust temperature of the compressor of the outdoor unit and the average exhaust temperature of the outdoor unit system reaches a preset value, and the average exhaust temperature of the outdoor unit is determined to be the average of the outdoor unit system. Judgment of the size of the exhaust gas temperature.
- the preset range may be set according to a system requirement, and the preset range may cause an average exhaust temperature of each outdoor unit to have a fluctuation value in a range of upper and lower ranges of the average exhaust temperature of the outdoor unit system. To ensure the stability of system control.
- control program of the multi-connected air conditioner when executed by the processor 102, the following method steps are implemented:
- the electronic expansion valve of the outdoor unit When the opening degree of the electronic expansion valve of the outdoor unit is less than the maximum opening degree, the electronic expansion valve is controlled to increase the opening degree based on the current opening degree.
- the injection electronic expansion valve when the average exhaust temperature of the compressor of the outdoor unit is higher than the average exhaust temperature of the outdoor unit system, and the superheat degree of the path of the injection electronic expansion valve is greater than the first preset value, Then it is further determined whether the current opening degree of the injection electronic expansion valve has reached the maximum opening degree that can be achieved. When the injection electronic expansion valve reaches the maximum opening degree that can be reached, it indicates that the injection electronic expansion valve can no longer increase the opening degree. Therefore, the injection electronic expansion valve can be continuously controlled to increase the opening degree only when the current opening degree of the injection electronic expansion valve has not reached the maximum opening degree.
- the injection electronic expansion valve is controlled to increase the opening degree based on the current opening degree to increase the refrigerant flow rate of the compressor of the outdoor unit to reduce the discharge thereof. Gas temperature.
- the injection electronic expansion valve it is judged whether the injection electronic expansion valve can continue to be opened by determining whether the opening degree of the injection electronic expansion valve reaches the maximum opening degree.
- the accuracy of the control of the injection electronic expansion valve is improved, and the injection electronic expansion valve and the entire system are also protected.
- control program of the multi-connected air conditioner when executed by the processor 102, the following method steps are implemented:
- the electronic expansion valve of the outdoor unit When the opening degree of the electronic expansion valve of the outdoor unit is greater than the minimum opening degree, the electronic expansion valve is controlled to reduce the opening degree based on the current opening degree.
- the injection electronic expansion valve when the average exhaust temperature of the compressor of the outdoor unit is less than the average exhaust temperature of the outdoor unit system, and the superheat degree of the path of the injection electronic expansion valve is greater than the first preset value, It is further determined whether the current opening degree of the injection electronic expansion valve has reached the minimum opening degree that can be achieved. When the injection electronic expansion valve reaches its The minimum opening that can be achieved indicates that the injection electronic expansion valve can no longer reduce the opening degree. Therefore, the injection electronic expansion valve can be continuously controlled to reduce the opening degree only when the current opening degree of the injection electronic expansion valve has not reached the minimum opening degree.
- the injection electronic expansion valve is controlled to increase the opening degree based on the current opening degree to increase the refrigerant flow rate of the compressor of the outdoor unit to reduce the discharge thereof. Gas temperature.
- the injection electronic expansion valve it is judged whether the injection electronic expansion valve can continue to be closed by determining whether the opening degree of the injection electronic expansion valve reaches the minimum opening degree.
- the accuracy of the control of the injection electronic expansion valve is improved, and the injection electronic expansion valve and the entire system are also protected.
- control program of the multi-connected air conditioner when executed by the processor 102, the following method steps are implemented:
- the exhaust gas temperature of the compressor of each of the outdoor units is obtained. Further, it is determined whether the exhaust temperature of the compressor of each outdoor unit is within a preset range, and when the exhaust temperature of the compressor exceeds a preset range, a fault signal is issued.
- the preset range is the exhaust temperature range under normal working conditions of the compressor, and can be set according to the actual situation of the system.
- an embodiment of the present invention further provides a computer readable storage medium, where the control program of the multi-connected air conditioner is stored, and the control program of the multi-connected air conditioner is implemented by the processor 102. Method steps as described in the above embodiments.
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Abstract
Description
Claims (15)
- 一种多联式空调的控制方法,其特征在于,所述多联式空调包括至少两台室外机,每台所述室外机包括至少一个压缩机,至少两台所述室外机组成室外机系统,所述多联式空调的控制方法包括如下步骤:检测每个所述室外机的过热度是否达到目标要求;在每个所述室外机的过热度达到目标要求时,判断每个所述室外机的平均排气温度与所述室外机系统的平均排气温度的差值是否达到预设值;在每个所述室外机的平均排气温度与所述室外机系统的平均排气温度的差值达到预设值时,比较每个所述室外机的平均排气温度与所述室外机系统的平均排气温度的大小;根据每个所述室外机的平均排气温度的大小与所述室外机系统的平均排气温度的大小的结果控制相应的电子膨胀阀动作以使每个所述室外机的平均排气温度接近所述室外机系统的平均排气温度。
- 根据权利要求1所述的多联式空调的控制方法,其特征在于,在每个所述室外机的平均排气温度与所述室外机系统的平均排气温度的差值达到预设值时,还进行每个所述室外机的电子膨胀阀所在通路的过热度是否大于第一预设值的第二判断,以便在每个所述室外机的电子膨胀阀所在通路的过热度大于第一预设值时,比较每个所述室外机的平均排气温度与所述室外机系统的平均排气温度的大小。
- 根据权利要求2所述的多联式空调的控制方法,其特征在于,根据每个所述室外机的平均排气温度的大小与所述室外机系统的平均排气温度的大小的结果控制相应的电子膨胀阀动作,包括:进行每个所述室外机的平均排气温度是否大于室外机系统的平均排气温度的第三判断;在第三判断结果为“是”时,则增加相应的电子膨胀阀的开度;在第三判断结果为“否”时,则减少相应的电子膨胀阀的开度。
- 根据权利要求1所述的多联式空调的控制方法,其特征在于,所述多联式空调包括两台室外机;所述根据每个所述室外机的平均排气温度的大小与所述室外机系统的平均排气温度的大小的结果控制相应的电子膨胀阀动作以使每个所述室外机的平均排气温度接近所述室外机系统的平均排气温度的步骤包括:判断两台所述室外机中平均排气温度高的室外机的电子膨胀阀的开度是否大于最大开度;在所述电子膨胀阀的开度小于最大开度时,则控制所述电子膨胀阀在当前开度的基础上增加开度。
- 根据权利要求1所述的多联式空调的控制方法,其特征在于,所述多联式空调包括两台室外机;所述根据每个所述室外机的平均排气温度的大小与所述室外机系统的平均排气温度的大小的结果控制相应的电子膨胀阀动作以使每个所述室外机的平均排气温度接近所述室外机系统的平均排气温度的步骤包括:判断两台所述室外机中平均排气温度低的室外机的电子膨胀阀的开度是否大于最小开度;在所述电子膨胀阀的开度大于最小开度时,则控制所述电子膨胀阀在当前开度的基础上减小开度。
- 根据权利要求1所述的多联式空调的控制方法,其特征在于,所述根据每个所述室外机的平均排气温度的大小与所述室外机系统的平均排气温度的大小的结果控制相应的电子膨胀阀动作以使每个所述室外机的平均排气温度接近所述室外机系统的平均排气温度的步骤包括:判断所述室外机的平均排气温度高于所述室外机系统的平均排气温度所对应的室外机的电子膨胀阀的开度是否大于最大开度;在所述电子膨胀阀的开度小于最大开度时,则控制所述电子膨胀阀在当前开度的基础上增加开度。
- 根据权利要求1所述的多联式空调的控制方法,其特征在于,所述根据每个所述室外机的平均排气温度的大小与所述室外机系统的平均排气温度的大小的结果控制相应的电子膨胀阀动作以使每个所述室外机的平均排气温度接近所述室外机系统的平均排气温度的步骤包括:判断所述室外机的平均排气温度低于所述室外机系统的平均排气温度所对应的室外机的电子膨胀阀的开度是否大于最小开度;在所述电子膨胀阀的开度大于最小开度时,则控制所述电子膨胀阀在当前开度的基础上减小开度。
- 根据权利要求1所述的多联式空调的控制方法,其特征在于,所述检测每个所述室外机的过热度是否达到目标要求的步骤包括:获取每个所述室外机的排气温度;根据所获得的排气温度比较得到所有所述室外机中的最低排气温度;检测所述最低排气温度对应的室外机的过热度是否达到目标要求。
- 根据权利要求1所述的多联式空调的控制方法,其特征在于,所述判断每个所述室外机的平均排气温度与所述室外机系统的平均排气温度的差值是否达到预设值的步骤包括:获取每个所述室外机的平均排气温度以及所述室外机系统的平均排气温度;根据每个所述室外机的平均排气温度以及所述室外机系统的平均排气温度获取每个所述室外机的平均排气温度与所述室外机系统的平均排气温度的差值的绝对值;判断所述绝对值是否达到预设值。
- 根据权利要求3所述的多联式空调的控制方法,其特征在于,所述进行每个所述室外机的电子膨胀阀所在通路的过热度是否大于第一预设值的第二判断的步骤之后还包括:在每个所述室外机的电子膨胀阀所在通路的过热度小于或等于第一预设值时,判断所述电子膨胀阀所在通路的过热度是否小于第二预设值;在所述电子膨胀阀所在通路的过热度小于所述第二预设值时,则保持电子膨胀阀当前的开度不变。
- 根据权利要求3所述的多联式空调的控制方法,其特征在于,所述在第三判断结果为“是”时,则增加相应的电子膨胀阀的开度的步骤包括:在第三判断结果为“是”时,判断所述室外机的电子膨胀阀的开度是否小于最大开度;在所述室外机的电子膨胀阀的开度小于最大开度时,控制所述电子膨胀阀在当前开度的基础上增加开度。
- 根据权利要求3所述的多联式空调的控制方法,其特征在于,所述在第三判断结果为“否”时,则减少相应的电子膨胀阀的开度的步骤包括:在第三判断结果为“否”时,判断所述室外机的电子膨胀阀的开度是否小于最小开度;在所述室外机的电子膨胀阀的开度大于最小开度时,则控制所述电子膨胀阀在当前开度的基础上减小开度。
- 根据权利要求1-12任一项所述的多联式空调的控制方法,其特征在于,所述方法还包括:获取每个所述室外机的压缩机的排气温度;判断每个所述室外机的压缩机的排气温度是否在预设范围内;在所述室外机的压缩机的排气温度超过预设范围时,则发出故障信号。
- 一种多联式空调系统,其特征在于,所述多联式空调系统包括至少两台室外机,每台所述室外机包括至少一个压缩机,至少两台所述室外机组成室外机系统;所述室外机还包括在室外机管路上连接的换向阀、室外换热器、气液分离器、电子膨胀阀、高压截止阀以及低压截止阀;所述多联式空调系统包括:存储器、处理器及存储在所述存储器上并可在所述处理器上运行的多联式空调的控制程序,所述多联式空调的控制程序被所述处理器执行时实现如权利要求1-13任一项所述的多联式空调的控制方法的步骤。
- 一种计算机可读存储介质,其特征在于,所述计算机可读存储介质上存储有多联式空调的控制程序,所述多联式空调的控制程序被处理器执行时实现如权利要求1-13任一项所述的多联式空调的控制方法的步骤。
Priority Applications (5)
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JP2019550194A JP2020514664A (ja) | 2017-09-18 | 2017-12-08 | マルチ式空気調和機の制御方法、マルチ式空気調和機システムおよびコンピュータ読み取り可能な記憶媒体 |
US16/493,301 US11137157B2 (en) | 2017-09-18 | 2017-12-08 | Method for controlling multi-split air conditioner, multi-split air conditioner system, and computer-readable storage medium |
EP17925459.4A EP3598013B1 (en) | 2017-09-18 | 2017-12-08 | Method for controlling multi-split air conditioner, multi-split air conditioner system, and computer-readable storage medium |
ES17925459T ES2932195T3 (es) | 2017-09-18 | 2017-12-08 | Procedimiento de control de un acondicionador de aire multi-split, un sistema acondicionador de aire multi-split y un medio de almacenamiento legible por ordenador |
KR1020197023357A KR20190105618A (ko) | 2017-09-18 | 2017-12-08 | 멀티연결식 공기조화기의 제어방법, 시스템 및 컴퓨터 판독가능 저장 매체 |
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CN201710846781.X | 2017-09-18 | ||
CN201710846781.XA CN107655166B (zh) | 2017-09-18 | 2017-09-18 | 多联式空调的控制方法、系统及计算机可读存储介质 |
CN201710848877.X | 2017-09-18 | ||
CN201710848877.XA CN107477933B (zh) | 2017-09-18 | 2017-09-18 | 多联式空调的控制方法、系统及计算机可读存储介质 |
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EP (1) | EP3598013B1 (zh) |
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US11378296B2 (en) * | 2019-01-10 | 2022-07-05 | Qingdao Haier Air-Conditioning Electronic Co., Ltd. | Multi-split air conditioner and control method thereof |
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US20210148588A1 (en) | 2021-05-20 |
EP3598013B1 (en) | 2022-10-19 |
ES2932195T3 (es) | 2023-01-16 |
EP3598013A1 (en) | 2020-01-22 |
EP3598013A4 (en) | 2020-06-17 |
KR20190105618A (ko) | 2019-09-17 |
US11137157B2 (en) | 2021-10-05 |
JP2020514664A (ja) | 2020-05-21 |
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