CN111426011A - Control method of air conditioning system, air conditioning system and computer storage medium - Google Patents

Control method of air conditioning system, air conditioning system and computer storage medium Download PDF

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Publication number
CN111426011A
CN111426011A CN202010287637.9A CN202010287637A CN111426011A CN 111426011 A CN111426011 A CN 111426011A CN 202010287637 A CN202010287637 A CN 202010287637A CN 111426011 A CN111426011 A CN 111426011A
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China
Prior art keywords
conditioning system
air conditioning
compressor
oil return
parameters
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Inventor
李鹏飞
许永锋
李宏伟
蒋运鹏
吴晓鸿
黄志林
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Priority to CN202010287637.9A priority Critical patent/CN111426011A/en
Publication of CN111426011A publication Critical patent/CN111426011A/en
Pending legal-status Critical Current

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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
    • 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
    • F24F11/67—Switching between heating and cooling modes
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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

Abstract

The invention provides a control method of an air conditioning system, the air conditioning system and a computer storage medium, wherein the control method of the air conditioning system comprises the following steps: acquiring system operation parameters of an air conditioning system and accumulated operation time corresponding to the system operation parameters; determining whether the air-conditioning system meets an oil return condition or not according to the system operation parameters and the accumulated operation time based on the current operation mode of the air-conditioning system; and controlling the air conditioning system to return oil based on the condition that the oil return condition is met. According to the air conditioning system control method provided by the invention, whether the air conditioning system meets the oil return condition or not is determined according to the running mode of the air conditioning system, the running parameters measured in the current running mode and the accumulated time under the parameters, so that the oil return opportunity is determined according to the current working parameters of the air conditioning system, the influence on the running of the compressor due to improper oil return opportunity is avoided, the air outlet temperature of the internal machine fluctuates, the user experience is influenced, and the stability of the air conditioning system is improved.

Description

Control method of air conditioning system, air conditioning system and computer storage medium
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to a control method of an air conditioning system, the air conditioning system and a computer storage medium.
Background
In the related technology, when a compressor of an air conditioning system operates, lubricating oil is discharged along with a refrigerant, the discharged lubricating oil needs to return to the compressor at an appropriate time to provide lubrication for the compressor, the existing air conditioning system takes accumulated current operation time as a trigger condition for oil return, however, in the operation process of the compressor, the oil discharge rate of the compressor is greatly different in different frequency sections, meanwhile, different exhaust pressures have great influence on the oil discharge rate under the same operation frequency, and if only simple timed oil return is adopted, the oil return time is inappropriate, so that the air outlet temperature of the internal machine fluctuates, and the use experience of a user is influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the present invention proposes a control method of an air conditioning system.
A second aspect of the present invention proposes an air conditioning system.
A third aspect of the invention provides a computer storage medium.
In view of the above, a first aspect of the present invention provides a control method of an air conditioning system, including: acquiring system operation parameters of an air conditioning system and accumulated operation time corresponding to the system operation parameters; determining whether the air-conditioning system meets an oil return condition or not according to the system operation parameters and the accumulated operation time based on the current operation mode of the air-conditioning system; and controlling the air conditioning system to return oil based on the condition that the oil return condition is met.
The control method of the air conditioning system provided by the invention monitors the system operation parameters of the air conditioning system and the corresponding accumulated operation time under the system operation parameters in real time when the air conditioning system operates, determines whether the air conditioning system meets an oil return condition according to the current operation mode of the air conditioning system, the system operation parameters measured under the current operation mode and the accumulated operation time under the parameters, and controls the air conditioning system to return oil when the oil return condition is met. According to the air conditioning system control method provided by the invention, whether the air conditioning system meets the oil return condition or not is determined according to the current operation mode of the air conditioning system, the system operation parameters measured in the current operation mode and the accumulated operation time of the parameters, so that the oil return time is accurately determined according to the current working parameters of the air conditioning system, the influence on the operation of the compressor caused by improper oil return time is avoided, the air outlet temperature fluctuation of the inner machine is caused, the user use experience is influenced, and the stability of the air conditioning system is improved.
In addition, the control method of the air conditioning system in the above technical solution provided by the present invention may further have the following additional technical features:
in the technical scheme, further, system operation parameters of the air conditioning system and the accumulated operation time corresponding to the system operation parameters are obtained, specifically, the system operation parameters are recorded in real time, and the accumulated operation time continuously operated by the system operation parameters is obtained; and acquiring an operating time threshold corresponding to each group of system operating parameters in the compressor oil return model according to each group of system operating parameters and the accumulated operating time corresponding to the system operating parameters.
In the technical scheme, when the air conditioning system runs, the running parameters of the system and the running time of the system under the parameters are monitored in real time, meanwhile, a parameter threshold value range corresponding to the running parameters of the system is obtained from a compressor oil return model, and then a running time threshold value corresponding to the parameter threshold value range in which the running parameters of the system are located in the compressor oil return model is obtained.
Specifically, the compressor oil return model is a relation model of operation parameters of the air conditioning system and time thresholds corresponding to oil return time, which is obtained through theoretical calculation and multiple times of experimental detection and verification, and different system operation parameters correspond to different time thresholds. Through the compressor oil return model, the accumulated operation time is timely corrected in the unit operation process, normal oil return of the compressor is guaranteed, and meanwhile the comfort experience of a user is improved.
In any of the above technical solutions, further, the step of determining whether the air conditioning system meets the oil return condition according to the system operation parameter and the accumulated operation time specifically includes: dividing the accumulated running time corresponding to each group of system running parameters by a running time threshold value to obtain a corresponding ratio; summing all the currently acquired ratios; and determining that the air conditioning system meets the oil return condition based on the condition that the current operation mode is the refrigeration mode and the summed value is more than or equal to 1.
In the technical scheme, the system operation parameters fluctuate in the operation process of the air-conditioning system, the system operation parameters of the air-conditioning system and the accumulated operation time under the system operation parameters are monitored in real time, the time threshold corresponding to the system operation parameters is obtained through the compressor oil return model, and then the accumulated operation time and the corresponding time threshold are divided to obtain the corresponding ratio. It can be known that, in the operation process of the air conditioning system, the operation parameters of the system will change continuously, so that, in the operation process of the air conditioning system, a plurality of accumulated operation times and corresponding time thresholds can be obtained, each accumulated operation time and corresponding time threshold are divided to obtain corresponding ratios, the obtained ratios are summed, and further, when the air conditioning system is currently in a refrigeration mode, and when the sum is greater than 1, the air conditioning system meets an oil return condition and controls the air conditioning system to return oil. The oil return time is effectively corrected through accurate acquisition of accumulated running time and calculation of the sum of the ratio of the accumulated running time to the corresponding time threshold, so that the oil return time is more accurately determined in a refrigeration mode of the air conditioning system, the fault of the air conditioning system caused by deviation of the oil return time is avoided, and the stability of the air conditioning system is further improved.
In any of the above technical solutions, further, based on that the current operation mode is the heating mode, the four-way valve of the air conditioning system does not switch the communication direction, and the sum value is greater than or equal to 1, it is determined that the air conditioning system meets the oil return condition.
In the technical scheme, system operation parameters of the air conditioning system and accumulated operation time under the system operation parameters are monitored in real time, time thresholds corresponding to the system operation parameters are obtained through a compressor oil return model, then the accumulated operation time and the corresponding time thresholds are divided to obtain corresponding ratios, then the obtained ratios are summed, further, when the air conditioning system is in a heating mode currently, whether a four-way valve of the air conditioning system switches a communication direction or not needs to be judged while the sum is larger than 1, and if the four-way valve of the air conditioning system does not switch the communication direction at the same time, the current air conditioning system meets an oil return condition and controls the air conditioning system to return oil. In a heating mode of the air conditioning system, through accurate acquisition of accumulated running time and calculation of the sum of the ratio of the accumulated running time to a corresponding time threshold, whether the four-way valve of the air conditioning system does not switch the communication direction or not needs to be judged, so that the determination of the oil return time of the air conditioning system is further accurate, the fault of the air conditioning system caused by deviation of the oil return time is avoided, and the stability of the air conditioning system is further improved.
In any of the above technical solutions, further, based on that the current operation mode is the heating mode, and when it is detected that the four-way valve switches the communication direction, the system operation parameters and the corresponding accumulated operation time are recorded again; and summing all the ratios acquired currently to calculate the sum of all the ratios acquired after the four-way valve switches the communication direction.
In the technical scheme, the system operation parameter of the air conditioning system and the accumulated operation time under the parameter are monitored in real time, the time threshold corresponding to the system operation parameter is obtained through a compressor oil return model, then the accumulated operation time is divided by the corresponding time threshold to obtain a corresponding ratio, then the obtained ratios are summed, further, when the air conditioning system is in a heating mode at present, when the sum is larger than 1, if the condition that the four-way valve of the air conditioning system switches the communication direction in the period is detected at the same time, the current air conditioning system is judged to be not suitable for oil return, meanwhile, the system operation parameter of the air conditioning system and the accumulated operation time under the parameter are monitored again, the time threshold corresponding to the system operation parameter is obtained through the compressor oil return model, then the accumulated operation time is divided by the corresponding time threshold to obtain a corresponding ratio, and then summing the obtained ratios, judging the communication direction of the four-way valve of the air-conditioning system again when the ratio summation value is larger than 1 until the ratio summation is larger than 1 and the communication direction of the four-way valve is not switched, determining that the air-conditioning system meets an oil return condition, and controlling the air-conditioning system to return oil.
In any of the above technical solutions, further, a compressor oil return model is established according to the system operation parameters of the air conditioning system and the oil level variation data of the compressor corresponding to the system operation parameters.
In the technical scheme, the compressor oil return model is a corresponding relation between an air conditioning system operation parameter and an oil return time threshold value. Specifically, according to the parameter characteristics of the air conditioning system, theoretical calculation and multiple times of experimental detection and verification can be performed to obtain the system operation parameters of the air conditioning system and a corresponding time threshold under the current parameters, and the time threshold can be used for correcting the oil return time of the air conditioning system. Specifically, monitoring an operation parameter of the air conditioning system and an accumulated operation time under the operation parameter, dividing the accumulated operation time by a time threshold corresponding to the operation parameter of the system to obtain a ratio, adding and summing a plurality of ratios obtained under a plurality of system operation parameters in different ranges, and determining that the air conditioning system meets an oil return condition if the sum value is greater than 1 and the air conditioning system is in a refrigeration mode; or, based on the sum being greater than 1, the air-conditioning system is in the heating mode, and the four-way valve of the air-conditioning system is not switched in the communication direction, it is determined that the air-conditioning system meets the oil return condition.
Further, the compressor oil return model may be a corresponding relationship between one operation parameter of the air conditioning system and one time threshold, or may be a time threshold corresponding to the condition that the air conditioning system is in operation under multiple operation parameters at the same time.
Further, the compressor oil return model may be a corresponding relationship between an operation parameter and a time threshold, or a corresponding relationship between a certain operation parameter range and a time threshold.
In any of the above technical solutions, further, the system operation parameter includes one of an operation frequency of the compressor, a capacity of the indoor unit, a capacity of the outdoor unit, and a load factor of the indoor unit, and one of a discharge pressure of the compressor, a discharge temperature of the compressor, a suction pressure of the compressor, a suction temperature of the compressor, and an outdoor ambient temperature.
According to the technical scheme, two system parameters during the operation of the air conditioning system and corresponding accumulated operation time under the operation of the two system parameters are obtained, different time thresholds during the parameter change are determined according to compressor oil return models of the two system parameters, and the oil return time of the air conditioning system is judged according to the accumulated operation time, the time thresholds and the working mode of the air conditioning system.
Specifically, the two operation parameters of the air conditioning system may be the operation frequency of the compressor and the discharge pressure of the compressor, the operation frequency of the compressor and the discharge temperature of the compressor, the operation frequency of the compressor and the suction pressure of the compressor, the operation frequency of the compressor and the suction temperature of the compressor, the operation frequency of the compressor and the outdoor environment temperature, the capacity of the indoor unit and the discharge pressure of the compressor, the capacity of the indoor unit and the discharge temperature of the compressor, the capacity of the indoor unit and the outdoor environment temperature, the capacity of the outdoor unit and the discharge pressure of the compressor, the capacity of the outdoor unit and the discharge temperature of the compressor, the capacity of the outdoor unit and the suction pressure of the compressor, the capacity of the outdoor unit and the discharge temperature of the compressor, the duty ratio of the indoor unit and the discharge pressure of the compressor, the discharge pressure of, Any one of the indoor unit load factor and the discharge temperature of the compressor, the indoor unit load factor and the suction pressure of the compressor, the indoor unit load factor and the suction temperature of the compressor, the indoor unit load factor and the outdoor ambient temperature.
In any of the above technical solutions, further, the step of controlling the air conditioning system to return oil specifically includes: and controlling a compressor of the air conditioning system to increase the operation frequency and increase the opening degree of an electronic expansion valve of the air conditioning system based on the fact that the operation mode is the refrigeration mode. And controlling a four-way valve of the air conditioning system to change direction based on the fact that the operation mode is a heating mode, and controlling the compressor to increase the operation frequency and increase the opening degree of the electronic expansion valve.
In the technical scheme, when the air conditioning system is in a refrigeration mode and the air conditioning system is judged to meet an oil return condition, the operation frequency of a compressor of the air conditioning system is controlled to be increased, and the opening degree of an electronic expansion valve of the air conditioning system is increased, so that the oil return process of the air conditioning system is realized.
When the air conditioning system is in a heating mode and the air conditioning system is judged to meet an oil return condition, the four-way valve of the air conditioning system is controlled to reverse, the running frequency of the compressor is controlled to be increased, and the opening degree of the electronic expansion valve is increased, so that the oil return process of the air conditioning system is realized.
According to a second aspect of the present invention, there is provided an air conditioning system, further comprising: a memory for storing a computer program; and a processor for executing a computer program to implement the control method of the air conditioning system in any one of the above technical aspects.
The air conditioning system provided by the invention stores the computer program through the memory, and the control method of the air conditioning system in any technical scheme is realized by executing the computer program through the processor, so that the air conditioning system has all the beneficial effects of the control method of the air conditioning system, and is not described again.
According to a third aspect of the present invention, there is provided a computer storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing the control method of the air conditioning system in any of the above-described aspects.
The computer storage medium provided by the present invention stores a computer program thereon, and the computer program, when executed by a processor, implements the control method of the air conditioning system according to one embodiment of the present invention, so that the control method of the air conditioning system has all the advantages of the control method of the air conditioning system, and is not described herein again.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: .
Fig. 1 is a flowchart illustrating a control method of an air conditioning system according to a first embodiment of the present invention;
fig. 2 is a flowchart illustrating a control method of an air conditioning system according to a second embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method of an air conditioning system according to a third embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A control method of an air conditioning system, and a computer storage medium according to some embodiments provided by the present invention are described below with reference to fig. 1 to 3.
Example one
As shown in fig. 1, a first aspect of the present invention provides a control method of an air conditioning system, including:
s102: acquiring system operation parameters of an air conditioning system and accumulated operation time corresponding to the system operation parameters;
s104: determining whether the air-conditioning system meets an oil return condition or not according to the system operation parameters and the accumulated operation time based on the current operation mode of the air-conditioning system;
s106: and controlling the air conditioning system to return oil based on the condition that the oil return condition is met.
The control method of the air conditioning system provided by the invention monitors the system operation parameters of the air conditioning system and the corresponding accumulated operation time under the system operation parameters in real time when the air conditioning system operates, determines whether the air conditioning system meets an oil return condition according to the current operation mode of the air conditioning system, the system operation parameters measured under the current operation mode and the accumulated operation time under the parameters, and controls the air conditioning system to return oil when the oil return condition is met. According to the air conditioning system control method provided by the invention, whether the air conditioning system meets the oil return condition is determined according to the current operation mode of the air conditioning system, the system operation parameters measured in the current operation mode and the accumulated operation time of the parameters, so that the oil return opportunity is accurately determined according to the current working parameters of the air conditioning system, and the influence on the operation of the compressor caused by improper oil return opportunity is avoided, thereby causing the fluctuation of the air outlet temperature of the inner machine and influencing the use experience of a user.
Further, acquiring system operation parameters of the air conditioning system and accumulated operation time corresponding to the system operation parameters, specifically, recording the system operation parameters in real time and continuously operating the accumulated operation time according to the system operation parameters; and acquiring an operating time threshold corresponding to each group of system operating parameters in the compressor oil return model according to each group of system operating parameters and the accumulated operating time corresponding to the system operating parameters.
Specifically, when the air conditioning system runs, the system running parameters and the running time of the system under the parameters are monitored in real time, meanwhile, a parameter threshold value range corresponding to the system running parameters is obtained from the compressor oil return model, and then a running time threshold value corresponding to the parameter threshold value range in which the system running parameters are located in the compressor oil return model is obtained.
Specifically, the compressor oil return model is a relation model of operation parameters of the air conditioning system and time thresholds corresponding to oil return time, which is obtained through theoretical calculation and multiple times of experimental detection and verification, and different system operation parameters correspond to different time thresholds. Through the compressor oil return model, the accumulated operation time is timely corrected in the unit operation process, normal oil return of the compressor is guaranteed, and meanwhile the comfort experience of a user is improved.
Example two
As shown in fig. 2, the present invention provides a control method of an air conditioning system, including:
s202: recording system operation parameters in real time, and continuously operating the accumulated operation time according to the system operation parameters;
s204: acquiring an operating time threshold corresponding to each group of system operating parameters in a compressor oil return model according to each group of system operating parameters and the accumulated operating time corresponding to the system operating parameters;
s206: dividing the accumulated running time corresponding to each group of system running parameters by a running time threshold value to obtain a corresponding ratio;
s208: summing all the currently acquired ratios;
s210: determining that the air conditioning system meets an oil return condition based on the condition that the current operation mode is a refrigeration mode and the summed value is greater than or equal to 1;
s212: and controlling the air conditioning system to return oil based on the condition that the oil return condition is met.
In the embodiment, the system operation parameters of the air conditioning system and the accumulated operation time under the parameters are monitored in real time, the time threshold corresponding to the system operation parameters is obtained through the compressor oil return model, and then the accumulated operation time is divided by the corresponding time threshold to obtain the corresponding ratio. It can be known that, in the operation process of the air conditioning system, the operation parameters of the system will change continuously, so that, in the operation process of the air conditioning system, a plurality of accumulated operation times and corresponding time thresholds can be obtained, each accumulated operation time and corresponding time threshold are divided to obtain corresponding ratios, the obtained ratios are summed, and further, when the air conditioning system is currently in a refrigeration mode, and when the sum is greater than 1, the air conditioning system meets an oil return condition and controls the air conditioning system to return oil. The oil return time is effectively corrected through accurate acquisition of accumulated running time and calculation of the sum of the ratio of the accumulated running time to the corresponding time threshold, so that the oil return time is more accurately determined in a refrigeration mode of the air conditioning system, the fault of the air conditioning system caused by deviation of the oil return time is avoided, and the stability of the air conditioning system is further improved.
Further, when the air conditioning system is in the refrigeration mode and the air conditioning system is judged to meet the oil return condition, the compressor of the air conditioning system is controlled to increase the operation frequency and the opening degree of the electronic expansion valve of the air conditioning system is increased, so that the oil return process of the air conditioning system is realized.
EXAMPLE III
As shown in fig. 3, a control method of an air conditioning system according to the present invention includes:
s302: recording system operation parameters in real time, and acquiring the system operation parameters of the air conditioning system and the accumulated operation time corresponding to the system operation parameters according to the accumulated operation time of the continuous operation of the system operation parameters;
s304: acquiring an operating time threshold corresponding to each group of system operating parameters in a compressor oil return model according to each group of system operating parameters and the accumulated operating time corresponding to the system operating parameters;
s306: dividing the accumulated running time corresponding to each group of system running parameters by a running time threshold value to obtain a corresponding ratio;
s308: summing all the currently acquired ratios;
s310: judging whether a four-way valve of the air conditioning system switches a communication direction or not based on the condition that the current operation mode is a heating mode and the summed value is more than or equal to 1;
s312: the four-way valve of the air conditioning system does not switch the communication direction, the air conditioning system is determined to meet the oil return condition, and the air conditioning system is controlled to return oil;
s314: and when the condition that the four-way valve is switched to the communication direction is detected, returning to the step S302 to record the system operation parameters and the corresponding accumulated operation time again.
In this embodiment, a system operation parameter of the air conditioning system and an accumulated operation time under the system operation parameter are monitored in real time, a time threshold corresponding to the system operation parameter is obtained through a compressor oil return model, then the accumulated operation time is divided by the corresponding time threshold to obtain a corresponding ratio, then the obtained ratios are summed, further, when the air conditioning system is currently in a heating mode, whether a four-way valve of the air conditioning system switches a communication direction or not needs to be judged while the sum is larger than 1, and if the four-way valve of the air conditioning system does not switch the communication direction at the same time, the current air conditioning system meets an oil return condition and controls the air conditioning system to return oil. In a heating mode of the air conditioning system, through accurate acquisition of accumulated running time and calculation of the sum of the ratio of the accumulated running time to a corresponding time threshold, whether the four-way valve of the air conditioning system does not switch the communication direction or not needs to be judged, so that the determination of the oil return time of the air conditioning system is further accurate, the fault of the air conditioning system caused by deviation of the oil return time is avoided, and the stability of the air conditioning system is further improved.
Further, based on the fact that the current operation mode is a heating mode, and under the condition that the four-way valve is detected to switch the communication direction, the system operation parameters and the corresponding accumulated operation time are recorded again; and summing all the ratios acquired currently to calculate the sum of all the ratios acquired after the four-way valve switches the communication direction.
Specifically, a system operation parameter of the air conditioning system and an accumulated operation time under the system operation parameter are monitored in real time, a time threshold corresponding to the system operation parameter is obtained through a compressor oil return model, then the accumulated operation time is divided by the corresponding time threshold to obtain a corresponding ratio, then the obtained ratios are summed, further, when the air conditioning system is in a heating mode currently, if the condition that a four-way valve of the air conditioning system switches a communication direction in the period is detected at the same time when the sum is larger than 1, the current air conditioning system is judged to be not suitable for oil return, meanwhile, the system operation parameter of the air conditioning system and the accumulated operation time under the parameter are monitored again, the time threshold corresponding to the system operation parameter is obtained through the compressor oil return model, and then the accumulated operation time is divided by the corresponding time threshold to obtain a corresponding ratio, and then summing the obtained ratios, judging the communication direction of the four-way valve of the air-conditioning system again when the ratio summation value is larger than 1 until the ratio summation is larger than 1 and the communication direction of the four-way valve is not switched, determining that the air-conditioning system meets an oil return condition, and controlling the air-conditioning system to return oil.
And further, establishing the compressor oil return model according to system operation parameters of the air conditioning system and oil level change data of the compressor corresponding to the system operation parameters. Specifically, the compressor oil return model is a corresponding relationship between an air conditioning system operating parameter and a time threshold. Specifically, according to the parameter characteristics of the air conditioning system, through theoretical calculation and multiple times of experimental detection, the operation parameters of the air conditioning system and a corresponding time threshold under the current parameters can be obtained, and the time threshold can be used for correcting the oil return time of the air conditioning system. Specifically, monitoring an operation parameter of the air conditioning system and an accumulated operation time under the operation parameter, dividing the accumulated operation time by a time threshold corresponding to the operation parameter to obtain a ratio, adding and summing a plurality of ratios obtained under a plurality of system operation parameters in different ranges, and determining that the air conditioning system meets an oil return condition if the sum is greater than 1 and the air conditioning system is in a refrigeration mode; or, based on the sum being greater than 1, the air-conditioning system is in the heating mode, and the four-way valve of the air-conditioning system is not switched in the communication direction, it is determined that the air-conditioning system meets the oil return condition.
Further, the compressor oil return model may be a corresponding relationship between one operation parameter of the air conditioning system and one time threshold, or may be a time threshold corresponding to the condition that the air conditioning system is in operation under multiple operation parameters at the same time.
Further, the system operation parameter includes one of an operation frequency of the compressor, a capacity of the indoor unit, a capacity of the outdoor unit, and a duty ratio of the indoor unit, and one of a discharge pressure of the compressor, a discharge temperature of the compressor, a suction pressure of the compressor, a suction temperature of the compressor, and an outdoor ambient temperature.
Specifically, two system parameters during the operation of the air conditioning system and corresponding accumulated operation time under the operation of the two system parameters are obtained, different time thresholds during the parameter change are determined according to compressor oil return models of the two system parameters, and the oil return time of the air conditioning system is judged according to the accumulated operation time, the time thresholds and the working mode of the air conditioning system.
Specifically, the two operation parameters of the air conditioning system may be the operation frequency of the compressor and the discharge pressure of the compressor, the operation frequency of the compressor and the discharge temperature of the compressor, the operation frequency of the compressor and the suction pressure of the compressor, the operation frequency of the compressor and the suction temperature of the compressor, the operation frequency of the compressor and the outdoor environment temperature, the capacity of the indoor unit and the discharge pressure of the compressor, the capacity of the indoor unit and the discharge temperature of the compressor, the capacity of the indoor unit and the outdoor environment temperature, the capacity of the outdoor unit and the discharge pressure of the compressor, the capacity of the outdoor unit and the discharge temperature of the compressor, the capacity of the outdoor unit and the suction pressure of the compressor, the capacity of the outdoor unit and the discharge temperature of the compressor, the duty ratio of the indoor unit and the discharge pressure of the compressor, the discharge pressure of, Any one of the indoor unit load factor and the discharge temperature of the compressor, the indoor unit load factor and the suction pressure of the compressor, the indoor unit load factor and the suction temperature of the compressor, the indoor unit load factor and the outdoor ambient temperature.
Specifically, when the air conditioning system operates in the cooling mode, a compressor oil return model based on two parameters of the compressor operating frequency Ac and the system high pressure Pc is established through experiments and theoretical calculation, and the corresponding relation between the two parameters of the compressor operating frequency Ac and the system high pressure Pc and a time threshold is shown in table 1, wherein the unit of the compressor operating frequency Ac is HZ, and the unit of the system high pressure Pc is Mpa.
TABLE 1
Figure BDA0002449131590000111
And tc1 to tc30 are time thresholds corresponding to the frequency range of the operating frequency Ac of the compressor and the pressure range of the high pressure Pc of the system when the air conditioning system operates in the cooling mode.
Further, when the air conditioning system operates in the heating mode, a compressor oil return model based on two parameters of the compressor operating frequency Ah and the system high pressure Ph is established through experiment and theoretical calculation, and the corresponding relation between the two parameters of the compressor operating frequency Ac and the system high pressure Pc and the time threshold is shown in table 2, wherein the unit of the compressor operating frequency Ac is HZ, and the unit of the system high pressure Pc is Mpa.
TABLE 2
Figure BDA0002449131590000121
And th1 to th30 are time thresholds corresponding to the frequency range of the operating frequency Ah of the compressor and the pressure range of the high pressure Ph of the system when the air-conditioning system operates in the heating mode.
Further, when the air conditioning system is in a heating mode and the air conditioning system is judged to meet an oil return condition, the four-way valve of the air conditioning system is controlled to reverse, the running frequency of the compressor is controlled to be increased, and the opening degree of the electronic expansion valve is increased, so that the oil return process of the air conditioning system is realized.
Example four
According to a second aspect of the present invention, there is provided an air conditioning system, further comprising: a memory for storing a computer program; and a processor for executing a computer program to implement the control method of the air conditioning system in any one of the above technical aspects.
The air conditioning system provided by the invention comprises a memory, a processor and a compressor. The control method of the air conditioning system in any technical scheme is realized by storing a computer program through a memory and executing the computer program through a processor, specifically, the processor monitors system operation parameters of the air conditioning system and accumulated operation time under the parameters in real time, obtains a time threshold corresponding to the system operation parameters through a compressor oil return model, and divides the accumulated operation time and the corresponding time threshold to obtain a corresponding ratio. And dividing each accumulated running time by the corresponding time threshold value to obtain a corresponding ratio, and then summing the obtained ratios.
Further, when the air conditioning system is currently in a cooling mode, the processor judges that the summation value is greater than 1, the air conditioning system meets an oil return condition, and the processor controls a compressor of the air conditioning system to increase the operating frequency and increase the opening degree of an electronic expansion valve of the air conditioning system.
Further, when the air conditioning system is currently in a refrigeration mode, the processor judges whether the four-way valve of the air conditioning system is not switched in the communication direction or not while the sum value is larger than 1, if the four-way valve of the air conditioning system is not switched in the communication direction, the current air conditioning system meets the oil return condition, the processor controls the four-way valve of the air conditioning system to change the direction, controls the compressor to increase the running frequency and increases the opening degree of the electronic expansion valve.
EXAMPLE five
According to a third aspect of the present invention, there is provided a computer storage medium having stored thereon a computer program which, when executed by a processor, implements the control method of the air conditioning system of any of the above embodiments.
Specifically, the computer storage medium provided by the present invention stores thereon a computer program, and the computer program, when executed by a processor, implements the control method of the air conditioning system in any of the above embodiments, so that all the beneficial effects of the control method of the air conditioning system are achieved, and details are not repeated herein.
EXAMPLE six
In a specific embodiment, the invention provides a multi-split air conditioner oil return control method, the existing multi-split air conditioner basically accumulates the current running time as an oil return triggering condition, and the method is simple and effective but has certain disadvantages. At different frequency sections, the compressor oil extraction rate has very big difference, and simultaneously, under same operating frequency, different exhaust pressure also has very big influence to the oil extraction rate, if only adopt simple timing oil return, then the unit will frequently return the oil and lead to interior machine air-out temperature fluctuation, influence the user and use experience.
According to the method, the oil level change data of the compressor under different frequencies and exhaust pressures are researched, the oil discharge and return model of the compressor is established, the accumulated running time is timely corrected in the running process of the unit, normal oil return of the compressor is guaranteed, and the comfort experience of a user is improved.
The method comprises the following specific steps:
in a first case, in a case where the air conditioning system operates in the cooling mode, the control method includes:
1. recording the running frequency Ac of the compressor, the high pressure Pc of the system and the corresponding accumulated running time Tc;
2. and when the following conditions are met, entering the next step, otherwise, returning to the previous step: when the Tc1/Tc1+ Tc2/Tc2+ Tc3/Tc3+ Tcn/Tcn is more than or equal to 1, the unit enters oil return operation;
3. starting oil return, and operating the unit according to an oil return logic;
4. and (5) returning to the step 1 after oil return is finished.
Specifically, when the air conditioning system operates in the cooling mode, the processor monitors the compressor operating frequency Ac and the system high pressure Pc of the air conditioning system in real time, and in the operating process of the air conditioning system, the processor monitors the compressor operating frequency Ac and the system high pressure Pc in real time, and records the corresponding accumulated operating time Tc 1-Tcn under different compressor operating frequencies Ac and system high pressures Pc, meanwhile, the processor obtains time thresholds Tc 1-Tcn corresponding to the current compressor operating frequency Ac and the system high pressure Pc in the compressor oil return model according to the compressor operating frequency Ac and the system high pressure Pc obtained in real time as shown in table 1, and then divides the accumulated operating time Tc 1-Tcn with the corresponding time thresholds Tc 1-Tcn to obtain corresponding ratios Tc1/Tc1, And Tc2/Tc2 … Tcn/Tcn, then carrying out cumulative summation on the obtained ratio, and when Tc1/Tc1+ Tc2/Tc2+ Tc3/Tc3+ Tcn/Tcn is more than or equal to 1, determining that the air-conditioning system meets an oil return condition, controlling the running frequency of a compressor of the air-conditioning system to be increased, increasing the opening degree of an electronic expansion valve of the air-conditioning system, and completing an oil return process.
According to the air conditioning system control method provided by the invention, the oil discharge and return model of the compressor is established by researching the oil discharge rate change data of the compressor under different frequencies and exhaust pressures according to the current operation mode of the air conditioning system, the system operation parameters measured under the current operation mode and the accumulated operation time under the parameters, and the accumulated operation time is corrected in time in the unit operation process, so that whether the air conditioning system meets the oil return condition or not is determined, the accurate determination of the oil return time according to the current working parameters of the air conditioning system is realized, the influence of improper oil return time on the operation of the compressor, the fluctuation of the air outlet temperature of the inner machine, the influence on the user experience and the improvement on the stability of the air conditioning system are avoided.
In the second case, the air conditioning system operates in a heating mode, and the control method includes:
1. recording the running frequency Ah of the compressor, the high pressure Ph of the system and the corresponding accumulated running time Th;
2. and when the following conditions are met, entering the next step, otherwise, returning to the previous step:
when Th1/Th1+ Th2/Th2+ Th3/Th3+ Thn/Thn is more than or equal to 1, the unit judges whether the four-way valve is switched during the operation, if not, the unit enters oil return operation; if yes, the accumulated running time is recalculated after the four-way valve is switched;
3. starting oil return, and operating the unit according to an oil return logic;
4. and (5) returning to the step 1 after oil return is finished.
Specifically, when the air conditioning system operates in a heating mode, the processor monitors the compressor operating frequency Ah and the system high pressure Ph of the air conditioning system in real time, in the operating process of the air conditioning system, the processor monitors the compressor operating frequency Ah and the system high pressure Ph in real time, records corresponding accumulated operating time Th 1-Thn under operating parameters, meanwhile, the processor obtains corresponding time threshold values Th 1-Thn according to the compressor operating frequency Ah and the system high pressure Ph monitored in real time from a compressor oil return model based on the compressor operating frequency Ah and the system high pressure Ph as shown in the table 2, then divides the accumulated operating time Th 1-Thn with the corresponding time threshold values Th 1-Thn to obtain corresponding ratios Th1/Th1 and Th2/Th2 … Thn/Thn, then sums up all ratios, and when 1/Th1+ 2/Th2+ Th3/Th3+ Th 8678 + Thn/Thn is not less than 1, the processor judges whether the four-way valve switches the communication direction, if the four-way valve does not switch the communication direction, the processor determines that the air-conditioning system meets the oil return condition, controls a compressor of the air-conditioning system to increase the running frequency, increases the opening degree of an electronic expansion valve of the air-conditioning system, and completes the oil return process; when Th1/Th1+ Th2/Th2+ Th3/Th3+ Thn/Thn is larger than or equal to 1, if the four-way valve switches the communication direction, the air conditioning system is judged not to reach the oil return opportunity, the processor executes the steps again until the conditions that Th1/Th1+ Th2/Th2+ Th3/Th3+ Thn/Thn are simultaneously met and the four-way valve does not switch the communication direction are met, and the processor controls the air conditioning system to perform oil return operation.
Further, in an embodiment, the compressor operating frequency can be replaced by the indoor unit load factor, the capacity of the opened indoor unit, the capacity of the outdoor unit or the total capacity of the indoor unit, and the discharge pressure can be replaced by the outside ambient temperature, the discharge temperature, the suction pressure or the suction temperature.
EXAMPLE seven
In a specific embodiment, the load factor of the indoor unit is used for replacing the running frequency of the compressor, and the exhaust temperature of the compressor is used for replacing the high pressure of the system, namely the exhaust pressure of the compressor, so that the control method of the air conditioning system comprises the following steps of:
in a first case, in a case where the air conditioning system operates in the cooling mode, the control method includes:
1. recording the load factor and the exhaust temperature T of the indoor unitExhaust of gasesAnd a corresponding accumulated running time Tc.
2. And when the following conditions are met, entering the next step, otherwise, returning to the previous step:
when the Tc1/Tc31+ Tc2/Tc32+ Tc3/Tc33+ Tcn/Tcn is more than or equal to 1, the unit enters oil return operation;
tc31, tc32 and tcn are running time thresholds corresponding to different indoor unit load rates and exhaust temperatures preset by the unit, and oil return models and values are shown in table 3:
TABLE 3
Figure BDA0002449131590000161
3. And starting oil return, and operating the unit according to an oil return logic.
4. And (5) returning to the step 1 after oil return is finished.
In the second case, the air conditioning system operates in a heating mode, and the control method includes:
1. recording the load factor and the exhaust temperature T of the indoor unitExhaust of gasesAnd a corresponding accumulated running time Th.
2. And when the following conditions are met, entering the next step, otherwise, returning to the previous step:
when Th1/Th31+ Th2/Th32+ Th3/Th33+ Thn/Thn is more than or equal to 1, the unit judges whether the four-way valve is switched during the operation, if not, the unit enters oil return operation;
if yes, the accumulated running time Th is recalculated after the four-way valve is switched;
th31, th32, thn are different indoor unit load rates and T preset by the unitExhaust of gasesThe corresponding operating time threshold, oil return model and values are shown in table 4:
TABLE 4
Figure BDA0002449131590000162
3. And starting oil return, and operating the unit according to an oil return logic.
4. And (5) returning to the step 1 after oil return is finished.
According to the air conditioning system control method provided by the invention, the oil discharge and return model of the compressor is established by researching the oil discharge rate change data of the compressor under different frequencies and exhaust pressures according to the current operation mode of the air conditioning system, the system operation parameters measured under the current operation mode and the accumulated operation time under the parameters, and the accumulated operation time is corrected in time in the unit operation process, so that whether the air conditioning system meets the oil return condition or not is determined, the accurate determination of the oil return time according to the current working parameters of the air conditioning system is realized, the influence of improper oil return time on the operation of the compressor, the fluctuation of the air outlet temperature of the inner machine, the influence on the user experience and the improvement on the stability of the air conditioning system are avoided.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the drawings, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A control method of an air conditioning system, characterized by comprising:
acquiring system operation parameters of the air conditioning system and accumulated operation time corresponding to the system operation parameters;
determining whether the air-conditioning system meets an oil return condition or not according to the system operation parameters and the accumulated operation time based on the current operation mode of the air-conditioning system;
and controlling the air conditioning system to return oil based on the condition that the oil return condition is met.
2. The method according to claim 1, wherein the obtaining of the system operation parameters of the air conditioning system and the accumulated operation time corresponding to the system operation parameters includes recording the system operation parameters in real time and the accumulated operation time of continuous operation of the system operation parameters;
and acquiring an operating time threshold corresponding to each group of system operating parameters in a compressor oil return model according to each group of system operating parameters and the accumulated operating time corresponding to the system operating parameters.
3. The method according to claim 2, wherein the step of determining whether the air conditioning system satisfies an oil return condition according to the system operation parameter and the accumulated operation time specifically includes:
dividing the accumulated running time corresponding to each group of the system running parameters by the running time threshold value to obtain a corresponding ratio;
summing all the ratios obtained currently;
and determining that the air conditioning system meets an oil return condition based on the condition that the current operation mode is a refrigeration mode and the summed value is greater than or equal to 1.
4. The control method of an air conditioning system according to claim 3,
and determining that the air-conditioning system meets an oil return condition under the condition that the current operation mode is a heating mode, the communication direction of a four-way valve of the air-conditioning system is not switched, and the sum value is greater than or equal to 1.
5. The control method of an air conditioning system according to claim 4,
based on that the current operation mode is a heating mode and the condition that the four-way valve is switched to the communication direction is detected, recording the system operation parameters and the corresponding accumulated operation time again;
and summing all the ratios acquired currently to calculate the sum of all the ratios acquired after the four-way valve switches the communication direction.
6. The control method of an air conditioning system according to claim 2, characterized by further comprising:
and establishing the compressor oil return model according to the system operation parameters of the air conditioning system and the oil level change data of the compressor corresponding to the system operation parameters.
7. The control method of an air conditioning system according to any one of claims 1 to 6, the air conditioning system including an indoor unit and an outdoor unit,
the system operation parameter includes one of an operation frequency of a compressor, a capacity of an indoor unit, a capacity of an outdoor unit, and a load factor of the indoor unit, and one of a discharge pressure of the compressor, a discharge temperature of the compressor, a suction pressure of the compressor, a suction temperature of the compressor, and an outdoor ambient temperature.
8. The method according to any one of claims 1 to 6, wherein the step of controlling the air conditioning system to return oil specifically comprises:
and controlling a compressor of the air conditioning system to increase the operation frequency and increase the opening degree of an electronic expansion valve of the air conditioning system based on that the operation mode is a refrigeration mode.
And controlling a four-way valve of the air conditioning system to change over based on the fact that the operation mode is a heating mode, controlling the compressor to increase the operation frequency, and increasing the opening degree of the electronic expansion valve.
9. An air conditioning system, characterized in that the air conditioning system further comprises:
a memory for storing a computer program;
a processor for executing the computer program to implement the control method of the air conditioning system according to any one of claims 1 to 8.
10. A computer storage medium on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements a control method of an air conditioning system according to any one of claims 1 to 8.
CN202010287637.9A 2020-04-13 2020-04-13 Control method of air conditioning system, air conditioning system and computer storage medium Pending CN111426011A (en)

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Application publication date: 20200717