CN113654182A - Method for detecting refrigerant leakage, computer readable storage medium and air conditioner - Google Patents

Method for detecting refrigerant leakage, computer readable storage medium and air conditioner Download PDF

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Publication number
CN113654182A
CN113654182A CN202111007644.XA CN202111007644A CN113654182A CN 113654182 A CN113654182 A CN 113654182A CN 202111007644 A CN202111007644 A CN 202111007644A CN 113654182 A CN113654182 A CN 113654182A
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China
Prior art keywords
pressure value
refrigerant
air conditioner
value
quotient
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CN202111007644.XA
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陈军宇
邓安哲
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Hisense Guangdong Air Conditioning Co Ltd
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Hisense Guangdong Air Conditioning Co Ltd
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Priority to CN202111007644.XA priority Critical patent/CN113654182A/en
Publication of CN113654182A publication Critical patent/CN113654182A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52—Indication arrangements, e.g. displays
    • 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
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure

Abstract

The invention discloses a method for detecting refrigerant leakage, a computer readable storage medium and an air conditioner, wherein the method comprises the following steps: acquiring working condition parameters of the air conditioner under the current operating working condition; inputting the working condition parameters into a reference pressure model to obtain a first reference pressure value and a second reference pressure value, wherein the reference pressure model is a data model obtained by modeling and training by taking the working condition parameters of different operating conditions and corresponding refrigerant pressure detection values under various operating modes as sampling data, the first reference pressure value corresponds to a first refrigerant quantity, the second reference pressure value corresponds to a second refrigerant quantity, and the first refrigerant quantity is greater than the second refrigerant quantity; acquiring an actually measured refrigerant pressure value; and determining the refrigerant leakage state according to the actually measured refrigerant pressure value, the first reference pressure value and the second reference pressure value. The method of the embodiment considers various operation conditions of the air conditioner, has more complete detection coverage, improves the detection accuracy, and reduces the conditions of missed judgment and erroneous judgment.

Description

Method for detecting refrigerant leakage, computer readable storage medium and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method for detecting refrigerant leakage, a computer readable storage medium and an air conditioner.
Background
In the installation process and the long-term use process of the air conditioner, due to the reasons of non-standard installation or complex use environment and the like, the damage of the pipeline is easy to occur due to factors such as vibration, corrosion and the like at the welding or connecting part of the pipeline and the pipeline, so that the refrigerant leakage phenomenon of the air conditioner is caused. In case of refrigerant leakage, the service performance of the air conditioner is poor due to insufficient refrigerant quantity, key parts of the air conditioner are easy to damage, and the like. In most of methods for detecting refrigerant leakage of air conditioners, a certain relevant parameter or a single model parameter is used as a reference value to determine whether a detected value of the parameter deviates from a normal range of the parameter, and when the detected value deviates from the normal range, refrigerant leakage is determined. The refrigerant leakage is identified by adopting the standard state of a single model, the influence of relevant interference factors is not considered, the data of the detection method is single, and the condition of misjudgment is easy to occur. And in most cases, the air conditioner is limited to the identification and judgment of the air conditioner in the operation state of the refrigerating function, and other functional states are not covered. If the refrigerant leakage detection method is only used for refrigerant leakage identification in the refrigeration function mode, the full-function use mode of air conditioner operation cannot be covered, the coverage area of the detection method is not comprehensive, and missing judgment is easy to occur. In some patent applications, a refrigerant detection and judgment method is provided, which mainly outputs a standard pressure parameter through a neural network model according to a working condition information parameter when an air conditioner operates, and then obtains a judgment result of whether a refrigerant leaks or not according to comparison between the standard pressure parameter and an actually-measured pressure parameter, wherein the standard pressure comprises evaporation pressure and condensation pressure. In other patent applications, a refrigerant detection and judgment method is proposed, which mainly compares and judges the return air pressure of the compressor with a set value of the return air pressure of the compressor, wherein the set value of the return air pressure is obtained according to an empirical formula through an indoor temperature value and an outdoor temperature value.
In the related art, by adopting the above scheme of outputting the standard pressure parameter through the neural network model, it is first required to ensure that the evaporation pressure and the condensation pressure are obtained when the air conditioner operates in an ideal state, but the air conditioner is affected by interference factors such as contamination of the evaporator and the condenser in the actual use process, and the evaporation pressure and the condensation pressure of the system have large changes, so the above scheme does not consider the influence of the interference factors, and has a large error. In addition, the above scheme can only identify the refrigerant leakage in the refrigeration function state, cannot identify the refrigerant leakage condition under other functions, and does not consider various operation conditions of the air conditioner. And in the mode of comparing and judging the return air pressure of the compressor and the return air pressure set value of the compressor, the return air pressure set value is judged only through the indoor temperature and the outdoor temperature value, and the error of the calculation result is large.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, one of the purposes of the invention is to provide a method for detecting refrigerant leakage, which considers various operation conditions of an air conditioner, has more complete detection coverage, improves the detection accuracy and reduces the conditions of missed judgment and erroneous judgment.
The second objective of the present invention is to provide an air conditioner.
It is a further object of the present invention to provide a computer-readable storage medium.
The fourth objective of the present invention is to provide an air conditioner.
In order to achieve the above object, a method for detecting refrigerant leakage according to an embodiment of the first aspect of the present invention includes: acquiring working condition parameters of the air conditioner under the current operating working condition; inputting the working condition parameters into a reference pressure model to obtain a first reference pressure value and a second reference pressure value, wherein the reference pressure model is a data model obtained by modeling and training by taking working condition parameters of different operating conditions and corresponding refrigerant pressure detection values under various operating modes as sampling data, the first reference pressure value corresponds to a first refrigerant quantity, the second reference pressure value corresponds to a second refrigerant quantity, and the first refrigerant quantity is greater than the second refrigerant quantity; acquiring an actually measured refrigerant pressure value; and determining the refrigerant leakage state according to the actually measured refrigerant pressure value, the first reference pressure value and the second reference pressure value.
According to the method for detecting the refrigerant leakage, provided by the embodiment of the invention, the reference pressure model is arranged, various working conditions of the operation of the air conditioner are involved, the detection coverage is more complete, the conditions of missed judgment and wrong judgment are reduced, and the method is more perfect compared with the existing data model, so that the accuracy of the judgment result is improved. The reference pressure model considers the influence of interference factors on the air conditioner in the use process, can accurately calculate the first reference pressure value and the second reference pressure value under different working conditions according to working condition parameters of the air conditioner in operation and the predictability of the reference pressure model, can meet the requirement of accurately positioning the normal value range of the parameters under different working conditions, and can obtain an accurate judgment result of refrigerant leakage and reduce the misjudgment condition by comparing and analyzing the actually measured refrigerant pressure value with the first reference pressure value and the second reference pressure value.
In some embodiments of the present invention, the determining the refrigerant leakage state according to the measured refrigerant pressure value, the first reference pressure value and the second reference pressure value includes: and if the actually measured exhaust pressure value is less than or equal to the second reference exhaust pressure value, determining that the refrigerant leaks, wherein the first refrigerant amount value is 94% -96%, and the second refrigerant amount value is 88% -92%.
In some embodiments of the present invention, determining a refrigerant leakage state according to the measured refrigerant pressure value, the first reference pressure value, and the second reference pressure value further includes: if the actually measured exhaust pressure value is greater than or equal to the first reference exhaust pressure value and less than or equal to the second reference exhaust pressure value, calculating an exhaust pressure difference value between the first reference exhaust pressure value and the actually measured exhaust pressure value, and calculating a first quotient of the exhaust pressure difference value and the first reference exhaust pressure value; re-acquiring the first reference exhaust pressure value and the actually measured refrigerant exhaust pressure value at intervals of preset duration to obtain a first quotient, and recording N first quotient values, wherein N is an integer greater than or equal to 1; and determining that the first quotient value is in a decreasing trend according to the (N +1) first quotient values, and then the refrigerant leaks.
In some embodiments of the present invention, the determining the refrigerant leakage state according to the measured refrigerant pressure value, the first reference pressure value and the second reference pressure value includes: and if the measured return air pressure value is less than or equal to the second reference return air pressure value, determining that the refrigerant leaks, wherein the first refrigerant quantity value is 94% -96%, and the second refrigerant quantity value is 88% -92%.
In some embodiments of the present invention, determining a refrigerant leakage state according to the measured refrigerant pressure value, the first reference pressure value, and the second reference pressure value further includes: if the actually measured return air pressure value is greater than or equal to the first reference return air pressure value and less than or equal to the second reference return air pressure value, calculating a return air pressure difference value between the first reference return air pressure value and the actually measured return air pressure value, and calculating a second quotient of the return air pressure difference value and the reference return air pressure value; re-acquiring the first reference exhaust pressure value and the actually measured refrigerant exhaust pressure value at preset time intervals to obtain second quotient values, and recording N second quotient values, wherein N is an integer larger than or equal to 1; and determining that the second quotient is in a decreasing trend according to the (N +1) second quotient, and then the refrigerant leaks.
In some embodiments of the invention, the method further comprises: and determining that the first quotient value does not show a decreasing trend according to the (N +1) first quotient values, or determining that the second quotient value does not show a decreasing trend according to the (N +1) second quotient values, and determining that the refrigerant is not leaked and pressure value interference exists.
In order to achieve the above object, an embodiment of a second aspect of the present invention provides an air conditioner, including: a processor; a memory communicatively coupled to the processor; the memory stores a computer program executable by the processor, and the processor implements the method for detecting refrigerant leakage according to any one of the above aspects when executing the computer program.
According to the air conditioner provided by the embodiment of the invention, the memory is in communication connection with the processor, the memory stores a computer program, and the processor can acquire working condition parameters and actually measured refrigerant pressure values of the air conditioner under the current operating condition when executing the computer program. And based on the working condition parameters and the predictive accuracy of the reference pressure model, outputting accurate first reference pressure value and second reference pressure value, and comparing and analyzing the actually measured refrigerant pressure value with the first reference pressure value and the second reference pressure value to obtain an accurate judgment result of refrigerant leakage, reducing the misjudgment condition and enabling the air conditioner to be more intelligent.
In order to achieve the above object, a computer-readable storage medium according to a third embodiment of the present invention has a computer program stored thereon, where the computer program is executed by a processor to implement any of the above methods for detecting refrigerant leakage.
According to the computer readable storage medium provided by the embodiment of the invention, the computer program is stored on the computer readable storage medium, when the computer program runs, the running parameters of each structure in the vehicle air conditioner can be obtained for analysis and calculation, and the judgment result of refrigerant leakage can be accurately obtained, so that the method for detecting refrigerant leakage in the embodiment can be realized, and the method can be directly applied to the existing air conditioner. When the air conditioner normally operates, based on working condition parameters under the working condition at that time, a first reference pressure value and a second reference pressure value which are adaptive to each other are obtained according to a prestored reference pressure model, and further, grading comparison analysis is carried out according to the obtained actually-measured refrigerant pressure value, the first reference pressure value and the second reference pressure value, so that the leakage state of the refrigerant is more accurately judged, the misjudgment condition is reduced, and the judgment result is more accurate and more intelligent.
In order to achieve the above object, an embodiment of a fourth aspect of the present invention provides an air conditioner, including: a refrigerant circulation system; the detection assembly is used for acquiring working condition parameters of the air conditioner under the current operating working condition; the pressure sensor is used for detecting an actually measured refrigerant pressure value of the refrigerant circulating system; the controller is stored with a reference pressure model and used for judging the refrigerant leakage state of the refrigerant circulating system according to the refrigerant leakage detection method.
According to the air conditioner provided by the embodiment of the invention, the detection assembly is used for acquiring working condition parameters of the air conditioner under the current operating condition, and the controller can be prestored with a reference pressure model. The controller can use the working condition parameters of the air conditioner under different working conditions as basic conditions, and accurately calculate the first reference pressure value and the second reference pressure value under different working conditions through the predictability of the reference pressure model according to the working condition parameters of the air conditioner during operation. The pressure sensor is used for detecting the actually measured refrigerant pressure value of the refrigerant circulating system and conveying the actually measured refrigerant pressure value to the controller, and the controller can also perform grading comparison analysis on the obtained actually measured refrigerant pressure value, the first reference pressure value and the second reference pressure value, so that the leakage state of the refrigerant can be more accurately judged, the dirt and dust accumulation conditions of a condenser and an evaporator in the air conditioner can also be judged, the misjudgment condition is reduced, and the controller is more intelligent.
In some embodiments of the present invention, the air conditioner further comprises: and the prompting device is connected with the controller and used for prompting the leakage of the refrigerant when the leakage of the refrigerant is determined and prompting the maintenance when the interference of the pressure value is determined.
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 of a method for detecting refrigerant leakage according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a refrigerant circulation system and leakage point arrangement according to an embodiment of the present invention
FIG. 3 is a block diagram of an air conditioner according to one embodiment of the present invention;
fig. 4 is a block diagram of an air conditioner according to another embodiment of the present invention;
fig. 5 is a block diagram of an air conditioner according to still another embodiment of the present invention.
Reference numerals:
an air conditioner 10;
a processor 101, a memory 102;
the device comprises a refrigerant circulating system 1, a detection assembly 2, a pressure sensor 3 and a controller 4;
the air conditioner comprises a compressor 11, a condenser 12, a throttling device 13, an evaporator 14, a refrigerant air bottle 15, an opening valve 16, a proportional valve 17, an explosion-proof air bag 118 and a fan 19.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
In order to solve the problem that the refrigerant leakage condition cannot be accurately identified when the air conditioner operates under different working conditions in the refrigerant leakage detection process, the embodiment of the invention provides a method for detecting refrigerant leakage and the air conditioner executing the control method.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The air conditioner performs a cooling/heating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. Wherein the refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigerating effect by heat exchange with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
An air conditioner according to some embodiments of the present application includes an air conditioner indoor unit installed in an indoor space. The indoor unit, i.e., the indoor unit, is connected to an outdoor unit, i.e., the outdoor unit, installed in an outdoor space through a pipe. The outdoor unit of the air conditioner may be provided with a compressor, an outdoor heat exchanger, an outdoor fan, an expander, and the like for a refrigeration cycle, and the indoor unit of the air conditioner may be provided with an indoor heat exchanger and an indoor fan.
A method for detecting refrigerant leakage according to an embodiment of the present invention is described below with reference to fig. 1, and fig. 1 is a flowchart of the method for detecting refrigerant leakage according to an embodiment of the present invention. It should be noted that the step numbers in the present application, such as S1, S2, S3, S4, and the like, are only for convenience of describing the present solution, and are not to be construed as limiting the order of the steps. That is, the execution order of, for example, steps S1, S2, S3, S4, etc. may be specifically determined according to actual needs, and is not limited to the control in the order of steps in the following embodiments.
In some embodiments of the present invention, as shown in fig. 1, the method for detecting refrigerant leakage at least includes steps S1-S4, which are as follows.
And S1, acquiring working condition parameters of the air conditioner under the current operating working condition.
The current operation working condition of the air conditioner comprises a refrigeration working condition, a heating working condition and the like, and the working condition parameters comprise parameters such as outdoor environment temperature, outdoor relative humidity, indoor environment temperature, indoor environment relative humidity, set temperature and set air volume under the refrigeration working condition or the heating working condition. When the user actually uses the air conditioner, the working condition parameters of the air conditioner under the current operating condition can be acquired after the air conditioner is started to operate for 20 minutes, so that the air conditioner is ensured to enter a stable operation state. And working condition parameters of the operation of the air conditioner can be acquired by arranging a sensor and the like. And the working condition parameters under different working conditions are used as basic conditions to carry out related test tests to obtain a certain amount of data information.
And S2, inputting the working condition parameters into the reference pressure model to obtain a first reference pressure value and a second reference pressure value. The first reference pressure value corresponds to a first refrigerant quantity, the second reference pressure value corresponds to a second refrigerant quantity, and the first refrigerant quantity is larger than the second refrigerant quantity.
Specifically, the first refrigerant amount takes a value of 94% -96%, and the second refrigerant amount takes a value of 88% -92%. Preferably, the first refrigerant amount may be set to be 95% and the second refrigerant amount may be set to be 90%. Because the second refrigerant quantity is lower, the refrigerant leakage can be directly determined when the actual refrigerant quantity is lower than the second refrigerant quantity.
The first benchmark pressure value comprises a first benchmark exhaust pressure value and a first benchmark return air pressure value, and the second benchmark pressure value comprises a second benchmark exhaust pressure value and a second benchmark return air pressure value. The method comprises the steps of inputting various working condition parameters into a reference pressure model, and fully considering indoor environment temperature, indoor relative humidity, outdoor environment temperature, outdoor relative humidity, set temperature, set air quantity and the like, so that more accurate first reference return air pressure value and second reference return air pressure value are obtained.
In an embodiment, the reference pressure model is a data model obtained by modeling and training the sampling data by using working condition parameters of different operating conditions in various operating modes and corresponding refrigerant pressure detection values. The reference pressure model is collected and sorted based on big data test, a calculation formula is established through the incidence relation among data, and an intelligent fuzzy algorithm is formed through repeated checking and error correction. And the input information is processed and directly judged through an intelligent fuzzy algorithm. If the error between the output information and the expected value cannot reach the set error, the relevant empirical coefficient is adjusted according to error prediction, and the next calculation is carried out until the error between the predicted output and the actual value reaches the expected error.
In some embodiments, refrigerant leakage affects changes in various operating parameters, particularly refrigerant system pressure. Under the working condition of refrigerating or heating operation of the air conditioner, when a refrigerant leaks, the exhaust pressure value and the return pressure value are both reduced, the pressure values of the inlet and the outlet of the main part of the air conditioner can be tested at different leakage positions and different average leakage rates, and the normal operation working condition of the system and the operation parameter data of the refrigerant leakage working condition are compared, so that the law of system pressure change when the refrigerant leaks is obtained.
Specifically, as shown in fig. 2, which is a schematic diagram of a refrigerant circulation system and a leakage point arrangement according to an embodiment of the present invention, 4 leakage points, respectively denoted as an X1 leakage point, an X2 leakage point, an X3 leakage point, and an X4 leakage point, may be selected in the refrigerant circulation system 1 of the air conditioner. And each leakage point is provided with at least one temperature measuring point T and at least one pressure measuring point P for acquiring temperature parameters and pressure parameters. Wherein the leakage point X1 is between the inlet of the compressor 11 and the condenser 12, the leakage point X2 is between the outlet of the condenser 12 and the throttle device 13, the leakage point X3 is between the outlet of the throttle device 13 and the inlet of the evaporator 14, and the leakage point X4 is between the outlet of the evaporator 14 and the compressor 11.
By setting a plurality of leakage points and setting a temperature measuring point T and a pressure measuring point P at the inlet and outlet of the compressor 11, the condenser 12, the throttling device 13 and the evaporator 14, the condensation pressure value and the evaporation pressure value can be obtained more accurately. And under the actual running state of the air conditioner, the position capable of most accurately reflecting the condensation pressure value or the evaporation pressure value of the heat exchanger can be found out more accurately according to a plurality of detected temperature parameters and a plurality of detected pressure parameters.
When the air conditioner operates under a refrigeration working condition, the temperature of the outdoor environment can be set to be 20-54 ℃ in combination with the use environment of the air conditioner under a laboratory condition. In the range of 20-54 ℃, one test point is arranged at intervals of 6 ℃, and 6 test points are taken in total. Setting the value range of the indoor environment temperature to be 20-35 ℃, setting one test point at every 5 ℃ interval in the range of 20-35 ℃, and taking 4 test points in total. In addition, the set temperature is 16 ℃, the set air volume is 50%, 70%, 85% and 100% of the maximum air volume of the actual operation condition of the air conditioner as the test points, and then 4 test points are obtained in total. The selected 4 leakage points are respectively tested, each leakage point is subjected to sampling test according to 100%, 95%, 90%, 85% and 80% of the actual refrigerant quantity, and the total number of the leakage points is 20 test points.
In summary, under the cooling condition, the air conditioner combines the indoor condition, the outdoor condition and the set air volume to form an actual operating condition of the air conditioner, and 6 × 4 × 20 is 1920 test condition points in total, and the exhaust pressure value and the return pressure value of the condition points are respectively tested. 1920 collected data points can be selected for verification, comparison and verification are carried out on the data collected data points and the data collected data points are compared with the calculation result of the data simulation model for verification, and after the verification is accurate, the model data are written into a controller of a product for storage.
Through data research and analysis, the exhaust pressure value and the return pressure value are found to be one of the parameters which can most directly reflect the change of the system after the refrigerant leaks. In addition, after the refrigerant leakage exceeds 10%, the exhaust pressure value and the return pressure value of the whole system have large difference changes. Similarly, the air conditioner has a rule of coincidence through corresponding tests under the heating condition.
In the middle of the user's in-service use air conditioner, because the restriction of mounted position can lead to the amount of wind of part air conditioner product to receive the influence, in addition, because do not clean for a long time, can have the dirty, the deposition's of evaporimeter and condenser condition to the live time is too long, can have evaporimeter and condenser heat transfer ability decay. These factors affect the use effect of the air conditioner, and most mainly affect the relevant operating parameters of the air conditioner, thereby affecting the accuracy of judging the refrigerant leakage. That is to say, under the working condition of cooling or heating operation of the air conditioner, when the refrigerant leaks or the evaporator or the condenser is dirty and deposited with dust, the exhaust pressure value and the return pressure value are affected.
Considering the operability of the test, in the process of carrying out different test tests, the test is carried out by shielding the evaporator or the condenser to be used as an interference test of refrigerant leakage faults, and the operating parameter data of the evaporator or the condenser under the working condition of dirt and dust accumulation is compared with that of the refrigerant under the working condition of leakage, so that the rule of system pressure change of the evaporator or the condenser under the condition of dirt and dust accumulation is obtained. The evaporator or the condenser can be shielded to replace the situation that the evaporator or the condenser is dirty and deposited with dust. That is to say, under the laboratory condition, when the air conditioner operates different operating modes, the area of sheltering from evaporimeter or condenser is one of refrigerant pressure interference factor value to the area of sheltering from evaporimeter or condenser should not be too big, avoids the air conditioner to initiate relevant protect function action.
When the air conditioner operates under a refrigeration working condition, the temperature of the outdoor environment can be set to be 20-54 ℃ in combination with the use environment of the air conditioner under a laboratory condition. In the range of 20-54 ℃, one test point is arranged at intervals of 6 ℃, and 6 test points are taken in total. Setting the value range of indoor environment temperature to be 20-35 ℃, setting the temperature to be 16 ℃ in the range of 20-35 ℃, setting the air quantity to be 50%, 70%, 85% and 100% of the maximum air quantity of the actual operation condition of the air conditioner as the test points, and then obtaining 4 test points in total, wherein the test points are one test point every 5 ℃ interval. And 4 test points with the shielded evaporator area of 20%, 40%, 60% and 80% are set.
In summary, under the cooling condition, the air conditioner combines the indoor condition, the outdoor condition, the set air volume and the evaporator shielding area to form an actual operating condition of the air conditioner, and 6 × 4 × 384 test condition points in total, and respectively test the exhaust pressure values and the return pressure values of the condition points to serve as a first reference exhaust pressure value and a first reference return pressure value, and 384 collection data points in total. The 384 collected data points can be selected for verification, comparison and verification are carried out on the data collected data points and the data collected data points are compared with the data simulation model calculation result for verification, and after the verification is accurate, the model data are written into a controller of a product for storage.
Through studying and analyzing the data, under the refrigeration working condition, the influence of the shielding evaporator on the reference pressure value is small initially, and the influence is increased along with the increase of the shielding area. For example, the maximum pressure effect value is substantially consistent with the pressure trend of the system when the system is filled with 95% refrigerant. Similarly, under the heating condition, the rule of the reference pressure value obtained when the condenser is shielded is identical with the rule, and the first reference exhaust pressure value and the first reference return air pressure value under the heating condition can be obtained according to the rule.
Based on the above two sets of test conclusions, it can be known that, besides refrigerant leakage, when the air conditioner operates in a cooling or heating working condition, some interference factors such as dirt and dust deposition of an indoor evaporator or an outdoor condenser also cause reduction of indoor air volume or outdoor air volume, and cause reduction of a reference pressure value, and the reference pressure value has a same variation trend with the reference pressure value when refrigerant leakage occurs. Therefore, the influence of the disturbance factor on the refrigerant leakage determination condition needs to be considered. The two groups of experiments can be started from a reverse recognition angle, the experiments are respectively carried out according to 100%, 95% and 90% of normal refrigerant quantity, then data are sorted, a pressure reference pressure model is formed through fitting by an intelligent fuzzy algorithm, and a reference pressure value is obtained according to the obtained working condition parameters.
The data model obtained by modeling and training with the working condition parameters of different operating conditions and the corresponding refrigerant pressure detection values in various operating modes as sampling data is used as a reference pressure model, and the method is as follows.
When the air conditioner operates under a refrigeration working condition, the temperature of the outdoor environment can be set to be 20-54 ℃ in combination with the use environment of the air conditioner under a laboratory condition. In the range of 20-54 ℃, one test point is arranged at intervals of 6 ℃, and 6 test points are taken in total. And 3 test points are obtained when the outdoor relative humidity is 40%, 70% and 90%, so that the outdoor working condition comprises 18 test points consisting of the outdoor environment temperature and the outdoor relative humidity. Similarly, the value range of the indoor environment temperature is set to be 20-35 ℃, in the range of 20-35 ℃, each test point is separated by 5 ℃, 4 test points are taken altogether, and 3 test points with the indoor relative humidity of 40%, 70% and 90% are obtained, so that 12 test points are formed by the indoor environment temperature and the indoor relative humidity in the indoor working condition. In addition, when the set temperature value range is 16-30 ℃, if a point is taken every 5 ℃ in the set temperature range, 4 test points are taken totally, and if the set air volume is 50%, 70%, 85% and 100% of the maximum air volume of the actual operation condition of the air conditioner as the test points, 4 test points are obtained totally.
In summary, under the cooling condition, the air conditioner combines the indoor condition, the outdoor condition, the set air volume and the evaporator shielding area to form an actual operating condition of the air conditioner, and 18 × 12 × 4 × 3456 test condition points are counted, and the exhaust pressure value and the return pressure value of the condition points are respectively tested to be used as a second reference exhaust pressure value and a second reference return pressure value, and 3456 collection data points are counted. 1456 collected data points can be selected for verification, comparison and verification are carried out on the collected data points and the calculation result of the data simulation model, and after verification and verification are accurate, model data are written into a controller of a product for storage.
When the air conditioner operates in a heating working condition, under a laboratory condition, the value of the outdoor environment temperature can be set to be-12-24 ℃, in the temperature range of-12-24 ℃, each test point is at an interval of 6 ℃, and 7 test points are taken in total. And 3 test points are obtained when the outdoor relative humidity is 40%, 70% and 90%, so that the outdoor working condition comprises 21 test points consisting of the outdoor environment temperature and the outdoor relative humidity. Similarly, the value range of the indoor environment temperature is set to be 6-24 ℃, and in the range of 6-24 ℃, each test point is arranged at an interval of 6 ℃, and 4 test points are taken. And 3 test points at 40%, 70% and 90% of outdoor relative humidity are obtained, so that 12 test points are formed by the indoor environment temperature and the indoor relative humidity in the indoor working condition. In addition, when the temperature range is set to be 16-30 ℃, one point is taken at intervals of 5 ℃ for 4 test points, and the set air volume takes 50%, 70%, 85% and 100% of the maximum air volume of the actual running condition of the air conditioner as the test points, so that 4 test points are taken.
In summary, an actual operation condition of the air conditioner is formed by combining the indoor condition, the outdoor condition and the set air volume, 21 × 12 × 4 in total is 4032 test condition points, and the exhaust pressure value and the return pressure value of the condition points are respectively tested to be used as a second reference exhaust pressure value and a second reference return pressure value, and in total 4032 collection data points are obtained. And after verification is accurate, the model data is written into a controller of the product for storage.
For example, when the outdoor environment temperature is 35 ℃, the outdoor relative humidity is 78%, the indoor environment temperature is 27 ℃ and the indoor relative humidity is 70%, the set temperature of the air conditioner is 20 ℃, the set wind speed is high wind, and the set wind volume is 650m 3/h, the working condition parameters can be automatically obtained after the air conditioner is started to operate for 20 minutes, the working condition parameters are input into the reference pressure model, and the program in the controller operates to output the corresponding first reference pressure value and the second reference pressure value according to the 6 working condition parameters. For example, the first reference exhaust pressure value is 1.76MPa, the first reference return air pressure value is 0.4MPa, the second reference exhaust pressure value is 1.725MPa, and the second reference return air pressure value is 0.394 MPa.
And S3, acquiring the actually measured refrigerant pressure value.
The actually measured refrigerant pressure value can be directly read by setting a pressure sensor and the like, or the actually measured refrigerant pressure value can be obtained by calculating according to the obtained working condition parameters. The actually measured refrigerant pressure value comprises an actually measured exhaust pressure value and an actually measured return air pressure value.
For example, when the outdoor ambient temperature is 35 ℃, the outdoor relative humidity is 78%, the indoor ambient temperature is 27 ℃, and the indoor relative humidity is 70%, the set temperature of the air conditioner is 20 ℃, the set wind is high wind, and the set wind volume is 650m 3/h. And after the air conditioner is started and operates for 20 minutes, the obtained actually-measured exhaust pressure value is 1.635MPa, and the actually-measured return air pressure value is 0.369 MPa.
And S4, determining the refrigerant leakage state according to the actually measured refrigerant pressure value, the first reference pressure value and the second reference pressure value.
For example, the acquired actually measured return air pressure value and/or actually measured exhaust pressure value is subjected to primary comparison and identification with a first reference return air pressure value and a first reference exhaust pressure value, so that the leakage state of the refrigerant is accurately judged. And the acquired actually measured exhaust pressure value and/or the actually measured exhaust pressure value can be compared with a second reference return air pressure value and a second reference exhaust pressure value in a second stage, so that the leakage state of the refrigerant or the fouling of the heat exchanger can be judged more accurately. After the secondary comparison, the primary comparison identification can be further verified, so that the accuracy of the judgment result is improved.
According to the method for detecting the refrigerant leakage, the working condition parameters of the air conditioner under different working conditions are used as basic conditions, and relevant test tests are carried out. The method comprises the steps of obtaining a certain number of working condition parameters and corresponding refrigerant pressure detection values as sampling data to be fitted to form an algorithm, extracting a certain number of working condition information, carrying out test comparison on a data simulation model, and establishing a reference pressure model after repeated checking, wherein the reference pressure model relates to various working conditions of air conditioner operation, the detection coverage is more complete, the conditions of missed judgment and wrong judgment are reduced, and the method is more complete compared with the existing data model, so that the accuracy of a judgment result is improved. The reference pressure model considers the influence of interference factors on the air conditioner in the use process, can perform reverse identification based on the reference pressure model, further accurately calculates a first reference pressure value and a second reference pressure value under different working conditions according to working condition parameters of the air conditioner in operation and the predictability of the reference pressure model, can meet the requirement of accurately positioning the normal value range of the parameters under different working conditions, and performs comparative analysis on the actually measured refrigerant pressure value and the first reference pressure value and the second reference pressure value, can obtain an accurate judgment result of refrigerant leakage, and reduces the misjudgment condition.
In some embodiments of the present invention, the first reference pressure value comprises a first reference discharge pressure value, the second reference pressure value comprises a second reference discharge pressure value, and the measured refrigerant pressure value comprises a measured discharge pressure value, wherein the first reference discharge pressure value is represented by Pp1, the second reference discharge pressure value is represented by Pp2, and the measured discharge pressure value is represented by P' P. And determining the refrigerant leakage state according to the actually measured refrigerant pressure value, the first reference pressure value and the second reference pressure value.
Specifically, if the measured discharge pressure value P' P is less than or equal to a second reference discharge pressure value Pp2, it is determined that the refrigerant leaks, where the first refrigerant amount is 95% and the second refrigerant amount is 90%. Since the second refrigerant quantity is relatively low, when the actually measured discharge pressure value P 'P is less than or equal to the second reference discharge pressure value Pp2, it indicates that the refrigerant quantity corresponding to the actually measured discharge pressure value P' P is lower than the second refrigerant quantity, that is, the refrigerant quantity is in a relatively low state, and it is determined that refrigerant leakage occurs.
In other embodiments of the present invention, the first reference pressure value further includes a first reference return air pressure value, the second reference pressure value further includes a second reference return air pressure value, and the measured refrigerant pressure value further includes a measured return air pressure value, where the first reference return air pressure value is represented by Ph1, the second reference return air pressure value is represented by Ph2, and the measured return air pressure value is represented by P' h.
Specifically, if the actually measured return air pressure value P' h is less than or equal to a second reference return air pressure value Ph2, it is determined that the refrigerant leaks, where the first refrigerant amount takes a value of 94% -96%, and the second refrigerant amount takes a value of 88% -92%. Because the second refrigerant quantity is relatively low, when the actually measured return air pressure value P 'h is less than or equal to the second reference return air pressure value Ph2, it indicates that the refrigerant quantity corresponding to the actually measured return air pressure value P' h is lower than the second refrigerant quantity, that is, the refrigerant quantity is in a relatively low state, and it is determined that refrigerant leakage occurs.
For example, when the outdoor ambient temperature is 35 ℃, the outdoor relative humidity is 78%, the indoor ambient temperature is 27 ℃, the indoor relative humidity is 70%, and the set temperature of the air conditioner is 20 ℃, the set wind is high wind, and the set wind volume is 650m3At the condition of/h. After the air conditioner runs for 20 minutes, the controller obtains a first reference pressure value and a second reference pressure value through the reference pressure model according to the obtained 6 working condition parameters. Wherein, the actually measured exhaust pressure value P 'P is 1.635MPa, and the actually measured return air pressure value P' h is 0.3694 MPa. The acquired first reference exhaust pressure value Pp1 is 1.76MPa, the first reference return air pressure value Ph1 is 0.4MPa, the second reference exhaust pressure value Pp2 is 1.725MPa, the second reference return air pressure value Ph2 is 0.394MPa, and if the conditions that P 'P is not less than Pp2 and P' h is not less than Ph2 are met, the refrigerant is determined to be leaked. Therefore, primary comparison and identification are carried out according to the reference pressure value and the actually measured refrigerant pressure value, the compressor of the air conditioner can be controlled to stop at the moment, the alarm is displayed, the leakage of the refrigerant is prompted, and immediate maintenance is required.
In some embodiments of the present invention, the refrigerant leakage state is determined according to the measured refrigerant pressure value, the first reference pressure value and the second reference pressure value, and the method further includes calculating a discharge pressure difference (P P1-P 'P) between the first reference discharge pressure value P P1 and the measured discharge pressure value P' P, and calculating a first quotient between the discharge pressure difference (P P1-P 'P) and the first reference discharge pressure value P P1, and the first quotient is denoted as F1, if the measured discharge pressure value P' P is greater than or equal to the first reference discharge pressure value P P1 and less than or equal to the second reference discharge pressure value Pp 2. Wherein, the calculation can be performed according to the algorithm shown in the formula (1-1) to obtain the first quotient F1.
F1 ═ (P P1-P' P)/P P1 formula (1-1)
When Pp1 is more than or equal to P 'P and less than Pp2, the represented refrigerant quantity is more than or equal to the second refrigerant quantity and less than or equal to the first refrigerant quantity, possibly due to refrigerant leakage, or possibly due to an actually measured exhaust pressure value P' P caused by heat exchanger dirt, and the refrigerant leakage condition needs to be further judged.
Specifically, the first reference exhaust pressure value and the actual value are reacquired at intervals of a preset durationAnd measuring the exhaust pressure value of the refrigerant to obtain a first quotient F1, and recording N first quotient F1, wherein N is an integer larger than or equal to 1. For example, the first quotient obtained by the first calculation is denoted as F11Calculating a first quotient at a preset time interval and recording the first quotient as F12According to the rule, the Nth first quotient value obtained is recorded as F1n. The preset time period may be set as required or under laboratory conditions, for example, the preset time period may be set to 30 minutes, the value of N may be 3, 4, 5, or 6, and if N is 3, the first quotient F1 needs to be obtained 3 times continuously, that is, the first quotient F1 is obtained for the first time1After 30 minutes, the first quotient F1 is obtained2And after 30 minutes, a first quotient F1 is obtained3。
And determining that the first quotient value is in a decreasing trend according to the (N +1) first quotient values, and then the refrigerant leaks. Specifically, referring to the above embodiment, if the first quotient value obtained three consecutive times satisfies F11＞F12＞F13And if so, determining the refrigerant leakage, controlling the air conditioner to display an alarm at the moment, prompting the refrigerant leakage and needing immediate maintenance.
In other embodiments of the invention, if the measured return air pressure value P 'h is greater than or equal to the first reference return air pressure value Ph1 and less than or equal to the second reference return air pressure value Ph2, a return air pressure difference (Ph 1-P' h) between the first reference return air pressure value Ph1 and the measured return air pressure value P 'h is calculated, a second quotient of the return air pressure difference (Ph 1-P' h) and the first reference return air pressure value Ph1 is calculated, and the second quotient is recorded as F2. Wherein, the calculation can be performed according to the algorithm shown in the formula (1-2) to obtain the second quotient F2.
F2 ═ Ph 1-P' h)/Ph1 formula (1-2)
Specifically, the first reference exhaust pressure value Ph1 and the actually measured refrigerant exhaust pressure value are obtained again at preset intervals to obtain a second quotient F2, and N second quotient F2 are recorded, wherein N is an integer larger than or equal to 1. For example, the second quotient obtained by the first calculation is denoted as F21Calculating a second quotient at a preset time interval and recording the second quotient as F22According to the rule, the Nth second quotient value obtained is recorded as F2n. By way of example onlyFor example, the preset time period may be set to 30 minutes, N may be 3, 4, 5, 6, and the like, and if N is 3, the second quotient needs to be obtained 3 times continuously, that is, the second quotient F2 is obtained for the first time1After 30 minutes, a second quotient F2 is obtained2And after 30 minutes, a second quotient F2 is obtained3。
And determining that the second quotient value is in a decreasing trend according to the (N +1) second quotient values, and then the refrigerant leaks. Specifically, referring to the above embodiment, if the second quotient obtained three consecutive times satisfies F21＞F22＞F23And if so, determining the refrigerant leakage, controlling the air conditioner to display an alarm at the moment, prompting the refrigerant leakage and needing immediate maintenance.
In other embodiments of the present invention, if it is determined that the second quotient F1 does not exhibit a decreasing trend according to the (N +1) first quotient F1, or if it is determined that the second quotient F2 does not exhibit a decreasing trend according to the (N +1) second quotient F2, it is determined that the refrigerant is not leaked and it is determined that the pressure value disturbance exists. With reference to the above embodiment, that is, it is determined that the first quotient obtained a plurality of times in succession does not satisfy F11＞F12＞F13Or determining that the second quotient obtained a plurality of consecutive times does not satisfy F21＞ F22＞F23If the refrigerant is determined not to be leaked but the heat exchanger is dirty, the air conditioner gives an alarm to prompt that the heat exchanger is dirty and needs to be cleaned immediately.
According to the method for detecting the refrigerant leakage, the acquired actually-measured refrigerant pressure value and the first reference pressure value are subjected to primary comparison and identification, so that the refrigerant leakage condition is determined. Furthermore, on the basis of carrying out primary comparison identification according to the first reference pressure value and the actually measured refrigerant pressure value, secondary comparison identification can be carried out according to the actually measured refrigerant pressure value and the second reference pressure value, refrigerant leakage or heat exchanger dirt and dust accumulation is distinguished according to a secondary comparison result, and therefore the primary comparison result is verified, and a more accurate refrigerant leakage judgment result is obtained.
In some embodiments of the present invention, as shown in fig. 3, a block diagram of an air conditioner according to an embodiment of the present invention is shown, wherein the air conditioner 10 includes a processor 101 and a memory 102.
In an embodiment, the memory 102 is communicatively coupled to the processor 101. The memory 102 stores a computer program executable by the processor 101, and the processor 101 implements the method for detecting refrigerant leakage according to any one of the above embodiments when executing the computer program.
In particular, the memory 102 and the processor 101 may implement processing of signals or data by hardware, among others. For example, the memory 102 may include a chip MCU (micro controller Unit), a single chip microcomputer, and the like, and a computer program is stored therein, and when the air conditioner 10 operates, the processor 101 obtains and executes the computer program stored in the memory 102, so as to control each component, and further implement the method for detecting refrigerant leakage according to any one of the above embodiments.
According to the air conditioner 10 provided by the embodiment of the invention, the memory 102 is in communication connection with the processor 101, the memory 102 stores a computer program, and the processor 101 can acquire working condition parameters and actually measured refrigerant pressure values of the air conditioner 10 under the current operating condition when executing the computer program. And based on the working condition parameters and the predictive accuracy of the reference pressure model, outputting accurate first reference pressure value and second reference pressure value, and comparing and analyzing the actually measured refrigerant pressure value with the first reference pressure value and the second reference pressure value to obtain an accurate judgment result of refrigerant leakage, so that the misjudgment condition is reduced, and the air conditioner 10 is more intelligent.
In some embodiments of the present invention, a computer-readable storage medium is further provided, on which a computer program is stored, and the computer program is executed by a processor to implement the method for detecting refrigerant leakage according to any of the above embodiments.
The computer-readable storage medium according to the embodiment of the present invention stores thereon a computer program, and when the computer program runs, the computer program can obtain the operation parameters of each structure in the vehicle air conditioner 10 to perform analysis and calculation, and accurately obtain the result of determining the refrigerant leakage, so as to implement the method for detecting the refrigerant leakage according to the above embodiment, and can be directly applied to the existing air conditioner 10. When the air conditioner 10 normally operates, based on working condition parameters under the working condition at that time, a first reference pressure value and a second reference pressure value which are adaptive to each other are obtained according to a prestored reference pressure model, and further, grading comparison analysis is performed according to the obtained actually-measured refrigerant pressure value and the first reference pressure value and the second reference pressure value, so that the leakage state of the refrigerant is more accurately judged, the dirt and dust accumulation conditions of a condenser and an evaporator in the air conditioner are judged, the misjudgment condition is reduced, and the judgment result is more accurate and more intelligent.
In some embodiments of the present invention, an air conditioner is further provided, as shown in fig. 4, which is a block diagram of an air conditioner according to another embodiment of the present invention, wherein the air conditioner 10 includes a refrigerant circulation system 1, a detection assembly 2, a pressure sensor 3, and a controller 4.
Specifically, the refrigerant circulation system 1 according to the embodiment of the present invention can be described with reference to fig. 2. The refrigerant circulating system 1 includes a compressor 11, a condenser 12, a throttling device 13, an evaporator 14, a refrigerant gas cylinder 15, an opening valve 16, a proportional valve 17, an explosion-proof air bag 118, a fan 19, and the like. When the air conditioner 10 operates in a cooling or heating condition, the refrigerant in the refrigerant circulation system 1 circulates in the pipeline, thereby achieving the cooling or heating function of the air conditioner 10.
The detection assembly 2 is used for obtaining working condition parameters of the air conditioner under the current operation working condition. The detection assembly 2 may include a temperature sensor, a humidity sensor, etc., and the devices are disposed at corresponding positions for detecting operating parameters such as outdoor ambient temperature, outdoor relative humidity, indoor ambient temperature, and indoor relative humidity. Specifically, when the air conditioner 10 is in an operating state, the stability of the air conditioning system is considered, and after the air conditioner 10 operates for 20 minutes, the detection assembly 2 acquires the working condition parameters of the air conditioner under the current operating condition, and transmits the acquired working condition parameters to the controller 4.
The pressure sensor 3 is used for detecting the actually measured refrigerant pressure value of the refrigerant circulating system 1. Specifically, the pressure sensor 3 may be disposed in the refrigerant circulation system 1, and after the air conditioner operates for 20 minutes, the actually measured refrigerant pressure value obtained through real-time detection is guaranteed to be the refrigerant pressure value when the air conditioner 10 operates stably, and the detected actually measured refrigerant pressure value is uploaded to the controller 4.
The controller 4 stores a reference pressure model for determining a refrigerant leakage state of the refrigerant circulation system 1 according to the method for detecting refrigerant leakage of any of the above embodiments.
Wherein, the controller 4 can be pre-stored with a reference pressure model, and the reference pressure model relates to various states of the operation of the air conditioner 10, so that the coverage is more comprehensive. The controller 4 can calculate a first reference pressure value and a second reference pressure value under different working conditions according to the reference pressure model and the interference factor-based pressure model and the obtained working condition parameters, and can solve the problem of inaccurate determination of the normal value range of the parameters under different working conditions. The controller 4 is also pre-stored with a preset proportional value, and then performs primary comparison and identification according to the obtained actual measurement return air pressure value and/or the actual measurement exhaust air pressure value, the first reference return air pressure value and the second reference exhaust air pressure value, so as to accurately judge the leakage state of the refrigerant. And the acquired actually measured exhaust pressure value and/or the actually measured exhaust pressure value can be compared with a second reference return air pressure value and a second reference exhaust pressure value in a second stage, so that the first-stage comparison identification is further verified, and the leakage state of the refrigerant or the fouling of the heat exchanger can be more accurately judged.
According to the air conditioner 10 provided by the embodiment of the invention, the detection assembly 2 is used for acquiring working condition parameters of the air conditioner under the current operating condition, and the controller 4 can be prestored with a reference pressure model. The controller 4 may use the working condition parameters of the air conditioner 10 under different working conditions as basic conditions, and accurately calculate the first reference pressure value and the second reference pressure value under different working conditions through the prediction of the reference pressure model according to the working condition parameters of the air conditioner during operation. The pressure sensor 3 is used for detecting the actually measured refrigerant pressure value of the refrigerant circulating system 1 and conveying the actually measured refrigerant pressure value to the controller 4, and the controller 4 can also perform grading comparison analysis with the first reference pressure value and the second reference pressure value according to the obtained actually measured refrigerant pressure value, so that the leakage state of the refrigerant can be more accurately judged, the dirt and dust accumulation conditions of a condenser and an evaporator in the air conditioner 10 can also be judged, the misjudgment condition is reduced, and the intelligent air conditioner is more intelligent.
In some embodiments of the present invention, as shown in fig. 5, the air conditioner 10 further includes a prompt device 5, where the prompt device 5 is connected to the controller 4, and is configured to prompt the refrigerant leakage when it is determined that the refrigerant leaks, and to prompt the maintenance when it is determined that there is a pressure value interference.
The prompting device 5 may include a display screen, a buzzer, a user terminal, and the like, and may display the fault code through the display screen, or the buzzer may make a sound to perform a voice prompt, or send a wireless prompting signal to an APP (Application) of the user terminal, or prompt the user in a short message manner.
Specifically, when primary comparison and identification are carried out according to the obtained actually-measured refrigerant pressure value and the reference pressure value, refrigerant leakage is determined to occur, the controller 4 controls the air conditioner 10 to stop running of the compressor, and sends a reminding signal or an instruction to the reminding device 5, and the reminding device 5 gives an alarm to remind that the refrigerant is leaked and needs to be immediately maintained. Or when secondary comparison and identification are carried out according to the actually measured refrigerant pressure value and the interference pressure value, the refrigerant leakage is determined to occur, the controller 4 sends a reminding signal or an instruction to the prompting device 5, and the prompting device 5 gives an alarm to prompt the refrigerant leakage and needs to be maintained immediately. Or when the secondary comparison and identification are carried out according to the actually measured refrigerant pressure value and the interference pressure value, the refrigerant is determined not to be leaked but the heat exchanger is dirty, the controller 4 sends a reminding signal or an instruction to the reminding device 5, and the reminding device 5 gives an alarm to remind that the heat exchanger is dirty and needs to be cleaned immediately.
Other constructions and operations of the air conditioner 10 according to the embodiment of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A method for detecting refrigerant leakage is characterized by comprising the following steps:
acquiring working condition parameters of the air conditioner under the current operating working condition;
inputting the working condition parameters into a reference pressure model to obtain a first reference pressure value and a second reference pressure value, wherein the reference pressure model is a data model obtained by modeling and training by taking working condition parameters of different operating conditions and corresponding refrigerant pressure detection values under various operating modes as sampling data, the first reference pressure value corresponds to a first refrigerant quantity, the second reference pressure value corresponds to a second refrigerant quantity, and the first refrigerant quantity is greater than the second refrigerant quantity;
acquiring an actually measured refrigerant pressure value;
and determining the refrigerant leakage state according to the actually measured refrigerant pressure value, the first reference pressure value and the second reference pressure value.
2. The method of claim 1, wherein the first reference pressure value comprises a first reference discharge pressure value, the second reference pressure value comprises a second reference discharge pressure value, the measured refrigerant pressure value comprises a measured discharge pressure value, and the refrigerant leakage state is determined according to the measured refrigerant pressure value, the first reference pressure value and the second reference pressure value, and comprises:
and if the actually measured exhaust pressure value is less than or equal to the second reference exhaust pressure value, determining that the refrigerant leaks, wherein the first refrigerant amount value is 94% -96%, and the second refrigerant amount value is 88% -92%.
3. The method of claim 2, wherein the refrigerant leakage state is determined according to the measured refrigerant pressure value, the first reference pressure value and the second reference pressure value, and further comprising:
if the actually measured exhaust pressure value is greater than or equal to the first reference exhaust pressure value and less than or equal to the second reference exhaust pressure value, calculating an exhaust pressure difference value between the first reference exhaust pressure value and the actually measured exhaust pressure value, and calculating a first quotient of the exhaust pressure difference value and the first reference exhaust pressure value;
re-acquiring the first reference exhaust pressure value and the actually measured refrigerant exhaust pressure value at intervals of preset duration to obtain a first quotient, and recording N first quotient values, wherein N is an integer greater than or equal to 1;
and determining that the first quotient value is in a decreasing trend according to the (N +1) first quotient values, and then the refrigerant leaks.
4. The method of detecting refrigerant leakage according to claim 1, wherein the first reference pressure value includes a first reference return air pressure value, the second reference pressure value includes a second reference return air pressure value, the measured refrigerant pressure value includes a measured return air pressure value, and the refrigerant leakage state is determined according to the measured refrigerant pressure value, the first reference pressure value, and the second reference pressure value, and includes:
and if the measured return air pressure value is less than or equal to the second reference return air pressure value, determining that the refrigerant leaks, wherein the first refrigerant quantity value is 94% -96%, and the second refrigerant quantity value is 88% -92%.
5. The method of claim 4, wherein the refrigerant leakage state is determined according to the measured refrigerant pressure value, the first reference pressure value and the second reference pressure value, and further comprising:
if the actually measured return air pressure value is greater than or equal to the first reference return air pressure value and less than or equal to the second reference return air pressure value, calculating a return air pressure difference value between the first reference return air pressure value and the actually measured return air pressure value, and calculating a second quotient of the return air pressure difference value and the reference return air pressure value;
re-acquiring the first reference exhaust pressure value and the actually measured refrigerant exhaust pressure value at preset time intervals to obtain second quotient values, and recording N second quotient values, wherein N is an integer larger than or equal to 1;
and determining that the second quotient is in a decreasing trend according to the (N +1) second quotient, and then the refrigerant leaks.
6. The method for detecting refrigerant leakage according to claim 3 or 5, further comprising:
and determining that the first quotient value does not show a decreasing trend according to the (N +1) first quotient values, or determining that the second quotient value does not show a decreasing trend according to the (N +1) second quotient values, and determining that the refrigerant is not leaked and pressure value interference exists.
7. An air conditioner, comprising:
a processor;
a memory communicatively coupled to the processor;
the memory stores a computer program executable by the processor, and the processor implements the method for detecting refrigerant leakage according to any one of claims 1 to 6 when executing the computer program.
8. A computer-readable storage medium, on which a computer program is stored, the computer program, when being executed by a processor, implementing the method for detecting refrigerant leakage according to any one of claims 1 to 6.
9. An air conditioner, comprising:
a refrigerant circulation system;
the detection assembly is used for acquiring working condition parameters of the air conditioner under the current operating working condition;
the pressure sensor is used for detecting an actually measured refrigerant pressure value of the refrigerant circulating system;
a controller storing a reference pressure model for determining a refrigerant leakage state of the refrigerant circulation system according to the method for detecting refrigerant leakage according to any one of claims 1 to 6.
10. The air conditioner according to claim 9, further comprising:
and the prompting device is connected with the controller and used for prompting the leakage of the refrigerant when the leakage of the refrigerant is determined and prompting the maintenance when the interference of the pressure value is determined.
CN202111007644.XA 2021-08-30 2021-08-30 Method for detecting refrigerant leakage, computer readable storage medium and air conditioner Pending CN113654182A (en)

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CN115143596A (en) * 2022-06-29 2022-10-04 创维空调科技(安徽)有限公司 Method for providing performance debugging direction for air conditioner research personnel
CN115200159A (en) * 2022-07-12 2022-10-18 珠海格力电器股份有限公司 Method, system and equipment for detecting fluorine deficiency of air conditioner
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