Refrigeration system safety early warning method and system based on operation status monitoring

Abstract

The present application relates to the technical field of refrigeration system safety monitoring, and specifically to a refrigeration system safety warning method and system based on operation status monitoring, the method comprising obtaining an operation status information set of an expansion valve in a refrigeration system and overall evaporator operation data of an evaporator, and obtaining an overload operation time period of the expansion valve according to the operation status information set; generating an evaporation efficiency oscillation coefficient of the evaporator according to the overload operation time period and the overall evaporator operation data; judging whether the evaporator belongs to a conventional safe operation state according to the evaporation efficiency oscillation coefficient, and if it is judged to be not, generating an evaporator safety warning instruction, and performing safety inspection on the evaporator according to the evaporator safety warning instruction. The present invention analyzes the operation state that is more prone to failure, realizes faster and more efficient safety warning, and improves the accuracy and efficiency of safety warning for refrigeration systems.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration system safety monitoring, and in particular to a refrigeration system safety early warning method and system based on operation status monitoring. Background Art

[0002] Refrigeration systems play a vital role in all types of industrial, commercial and civil buildings. Their safe operation is directly related to the life of the equipment, energy efficiency, and the safety of personnel and the environment.

[0003] Regarding the safety warning method of the refrigeration system in the prior art, there is a Chinese invention patent with publication number CN116007128A, which discloses a refrigeration system fault warning method, system and computer-readable storage medium on April 25, 2023. The method is specifically as follows: each time the refrigeration system reaches the low-pressure alarm condition of the alarm system and reaches the preset false alarm condition, the compressor is suspended for a preset short buffer time T, and the number of compressor shutdowns N1 is recorded, until the number of compressor shutdowns N1 is equal to the preset number of shutdowns N and the low-pressure alarm condition is reached again, a low-pressure alarm signal is issued to start the low-pressure protection relay.

[0004] Although the technical solution in the above patent document can avoid the inflated frequency of refrigeration system failure and shutdown by pausing the compressor, there are still problems. Specifically, it does not take into account the coordinated operation relationship of the refrigeration facilities in the refrigeration system, and only performs full-time warning on the compressor and evaporator. This may easily lead to insufficient analysis targeting and low accuracy of operating status analysis due to the failure to distinguish between time periods for warning analysis. Summary of the invention

[0005] Based on this, it is necessary to provide a refrigeration system safety warning method and system based on operating status monitoring that can solve the problems of insufficient analysis pertinence and low accuracy of operating status analysis caused by analyzing the evaporator without distinguishing time periods in the prior art, so as to focus the operating analysis of the evaporator on the working state where failures are most likely to occur, thereby achieving faster and more efficient safety warnings, and improving the accuracy and efficiency of safety warnings for the refrigeration system.

[0006] The technical solution of the present invention is as follows:

[0007] A refrigeration system safety early warning method based on operation status monitoring, the method comprising:

[0008] Acquire an operation status information set of an expansion valve and overall operation data of an evaporator in a refrigeration system, and acquire an overload operation time period of the expansion valve according to the operation status information set;

[0009] generating an evaporation efficiency oscillation coefficient of the evaporator according to the overload operation time period and the overall operation data of the evaporator;

[0010] judging whether the evaporator is in a normal safe operation state according to the evaporation efficiency oscillation coefficient, wherein the normal safe operation state is preset;

[0011] If the judgment is no, an evaporator safety warning instruction is generated, and a safety check is performed on the evaporator according to the evaporator safety warning instruction.

[0012] Optionally, acquiring the overload operation time period of the expansion valve according to the operation status information set includes:

[0013] Calculating the actual operating load of the expansion valve according to the operating status information set of the expansion valve;

[0014] Screen out the actual operating load that is greater than or equal to the calibrated sampling load or within the calibrated load range, and record the screened actual operating load as the target operating load;

[0015] Obtaining a target operating time point of the target operating load, and setting a sampling time period according to the target operating time point, wherein the sampling time period is a time range of a first time length before the target operating time point, the first time length is preset, and one target operating load corresponds to one sampling time period;

[0016] Calculating the load fluctuation rate of the expansion valve in the sampling time period according to the real-time operating load of the expansion valve in the sampling time period;

[0017] The load fluctuation rate that is greater than or equal to the load fluctuation threshold is screened out, and the sampling time period corresponding to the screened load fluctuation rate is recorded as the overload operation time period of the expansion valve.

[0018] Optionally, calculating the actual operating load of the expansion valve according to the operating status information set of the expansion valve includes:

[0019] Extracting the expansion valve surface temperature, the expansion valve inlet temperature, the expansion valve outlet temperature, the expansion valve inlet pressure, the expansion valve outlet pressure and the valve body opening according to the expansion valve operation status information set;

[0020] According to the surface temperature of the expansion valve, the current environmental impact coefficient is calculated based on the following formula:

[0021] ;

[0022] Wherein, Ce is the current environmental impact coefficient, Cs is the reference environmental impact coefficient corresponding to the standard reference temperature, Tc is the preset temperature compensation coefficient, Tsev is the expansion valve surface temperature, and Tret is the standard reference temperature;

[0023] Generate a valve body basic load according to the expansion valve surface temperature, the expansion valve inlet temperature, the expansion valve outlet temperature, the expansion valve inlet pressure and the expansion valve outlet pressure;

[0024] According to the current environmental impact coefficient and the valve body basic load, the actual operating load is generated based on the following formula:

[0025] ;

[0026] Among them, EVT is the actual operating load, Ce is the current environmental impact coefficient, and EVF is the valve body basic load.

[0027] Optionally, generate the valve body base load based on the following formula:

[0028]

[0029] Among them, EVF is the basic load of the valve body, Tsev is the surface temperature of the expansion valve, Tvou is the outlet temperature of the expansion valve, and Tvin is the inlet temperature of the expansion valve. is the refrigerant density, Ae is the valve opening, Pvou is the expansion valve outlet pressure, and Pvin is the expansion valve inlet pressure.

[0030] Optionally, calculating the load fluctuation rate of the expansion valve within the sampling time period according to the real-time operating load of the expansion valve within the sampling time period includes:

[0031] Calculating the load slope of two adjacent real-time operating loads of the expansion valve in the sampling time period;

[0032] Calculating the load standard deviation of each of the real-time operating loads;

[0033] The load fluctuation rate is generated according to each of the load slopes and the load standard deviation based on the following formula:

[0034] ;

[0035] Wherein, LFR is the load fluctuation rate, is the preset fixed weight parameter, m is the serial number of the load slope, n is the number of load slopes, Kem is the mth load slope, is the mean of the slopes of each load, and S is the standard deviation of the load.

[0036] Optionally, generating an evaporation efficiency oscillation coefficient of the evaporator according to the overload operation time period and the overall operation data of the evaporator includes:

[0037] Extracting high-load evaporation operation data matching the overload operation time period from the overall operation data of the evaporator, wherein one overload operation time period corresponds to one high-load evaporation operation data;

[0038] extracting evaporator pressure data, evaporator overall temperature data and evaporator vibration data from the high-load evaporation operation data;

[0039] generating a refrigerant inlet enthalpy of the refrigerant at the evaporator inlet, a refrigerant outlet enthalpy of the refrigerant at the evaporator outlet, and a latent heat of evaporation of the refrigerant according to the evaporator pressure data and a preset standard pressure-enthalpy diagram;

[0040] Extracting the evaporation inlet temperature, the evaporation outlet temperature and the evaporation middle section temperature from the overall temperature data of the evaporator, and generating the overall evaporation temperature according to the evaporation inlet temperature, the evaporation outlet temperature and the evaporation middle section temperature;

[0041] Extracting a sampled vibration amplitude and a sampled vibration frequency according to the evaporator vibration data;

[0042] generating an evaporation efficiency factor according to the refrigerant inlet enthalpy, the refrigerant outlet enthalpy, the refrigerant evaporation latent heat, the overall evaporation temperature, the sampling vibration amplitude and the sampling vibration frequency;

[0043] The standard deviation is calculated according to each of the evaporation efficiency factors, and the standard deviation is recorded as the evaporation efficiency oscillation coefficient.

[0044] Optionally, generate an evaporation efficiency factor based on the following formula:

[0045] ;

[0046] Among them, EEC is the evaporation efficiency factor, Hp2 is the refrigerant outlet enthalpy, Hp1 is the refrigerant inlet enthalpy, and Href is the latent heat of evaporation of the refrigerant. is the thermal expansion coefficient, N is the number of overall evaporation temperatures, is the fluctuation range of the overall evaporation temperature, t is the tth overall evaporation temperature, k is the vibration sensitivity coefficient, Avbt is the tth sampling vibration amplitude, and ft is the tth sampling vibration frequency.

[0047] Optionally, a refrigeration system safety warning system based on operation status monitoring is also provided, the system comprising:

[0048] A load operation generating module, used for acquiring an operation status information set of an expansion valve and overall operation data of an evaporator in a refrigeration system, and acquiring an overload operation time period of the expansion valve according to the operation status information set;

[0049] A stability coefficient generating module, used for generating an evaporation efficiency oscillation coefficient of the evaporator according to the overload operation time period and the overall operation data of the evaporator;

[0050] A safety state judgment module, used for judging whether the evaporator is in a normal safety operation state according to the evaporation efficiency oscillation coefficient, wherein the normal safety operation state is preset;

[0051] The safety warning generation module is used to generate an evaporator safety warning instruction if the judgment is no, and perform safety detection on the evaporator according to the evaporator safety warning instruction.

[0052] Optionally, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps described in the above-mentioned refrigeration system safety warning method based on operation status monitoring when executing the computer program.

[0053] Optionally, a computer-readable storage medium is also provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned refrigeration system safety early warning method based on operation status monitoring are implemented.

[0054] The technical effects achieved by the present invention are as follows:

[0055] The above-mentioned refrigeration system safety warning method and system based on operation status monitoring obtains the operation status information set of the expansion valve in the refrigeration system and the overall operation data of the evaporator, and obtains the overload operation time period of the expansion valve according to the operation status information set; generates the evaporation efficiency oscillation coefficient of the evaporator according to the overload operation time period and the overall operation data of the evaporator; judges whether the evaporator belongs to the conventional safety operation state according to the evaporation efficiency oscillation coefficient, wherein the conventional safety operation state is preset; if it is judged as no, an evaporator safety warning instruction is generated, and the evaporator is safety tested according to the evaporator safety warning instruction. In the present invention, the operation status information set is the data reflecting the operation status of the expansion valve monitored during the operation of the expansion valve in the refrigeration system, the overall operation data of the evaporator is the operation data of the evaporator corresponding to the operation status information set, and the overload operation time period is the time period corresponding to the state when the operation load of the expansion valve reaches a large impact on the evaporator, making the evaporator prone to failure. By first obtaining the operation status information set of the expansion valve in the refrigeration system and the overall operation data of the evaporator, and obtaining the overload operation time period of the expansion valve according to the operation status information set, and then generating the evaporation efficiency oscillation coefficient of the evaporator according to the overload operation time period and the overall operation data of the evaporator, the evaporation efficiency oscillation coefficient is data indicating the stability of the operation status of the evaporator, and judging whether the evaporator is in a preset conventional safety operation status by the evaporation efficiency oscillation coefficient, if the judgment is yes, that is, judging that the evaporator is in a conventional safety operation status, then generating a refrigeration system continuous monitoring instruction, and continuously monitoring the refrigeration system according to the refrigeration system continuous monitoring instruction. If the judgment is no, that is, judging that the evaporator is not in a conventional safety operation status, thus generating an evaporator safety warning instruction, and performing safety detection on the evaporator according to the evaporator safety warning instruction. The present invention monitors the coordinated operation relationship between the expansion valve and the evaporator in the refrigeration system, and utilizes the principle that the expansion valve has a greater impact on the operating state of the evaporator during the overload operation period, so as to realize the operation safety analysis of the evaporator when the operating state of the evaporator is greatly affected, so as to more efficiently utilize data analysis resources and analyze the operating states that are more prone to failures, thereby realizing faster and more efficient safety warnings, and improving the accuracy and efficiency of safety warnings for the refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a flowchart of a refrigeration system safety early warning method based on operation status monitoring in one embodiment;

[0057] Figure 2 The figure is a structural block diagram of a refrigeration system safety warning system based on operation status monitoring in one embodiment. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0059] In one embodiment, Figure 1 As shown, a refrigeration system safety early warning method based on operation status monitoring is provided, and the method comprises:

[0060] Step S100: acquiring an operation status information set of an expansion valve and overall operation data of an evaporator in a refrigeration system, and acquiring an overload operation time period of the expansion valve according to the operation status information set;

[0061] Step S200: generating an evaporation efficiency oscillation coefficient of the evaporator according to the overload operation time period and the overall operation data of the evaporator;

[0062] Step S300: judging whether the evaporator is in a normal safe operation state according to the evaporation efficiency oscillation coefficient, wherein the normal safe operation state is preset;

[0063] Step S400: If the judgment is no, an evaporator safety warning instruction is generated, and a safety check is performed on the evaporator according to the evaporator safety warning instruction.

[0064] In this embodiment, the operation status information set is data reflecting the operation status of the expansion valve monitored during the operation of the expansion valve in the refrigeration system, the overall operation data of the evaporator is the operation data of the evaporator corresponding to the operation status information set, and the overload operation time period is the time period corresponding to the state when the operation load of the expansion valve reaches a large impact on the evaporator, making the evaporator prone to failure. The operation status information set of the expansion valve in the refrigeration system and the overall operation data of the evaporator are first obtained, and the overload operation time period of the expansion valve is obtained according to the operation status information set, and then the evaporation efficiency oscillation coefficient of the evaporator is generated according to the overload operation time period and the overall operation data of the evaporator. The evaporation efficiency oscillation coefficient is data indicating the stability of the operation status of the evaporator. It is judged whether the evaporator is in a preset normal safety operation state through the evaporation efficiency oscillation coefficient. If it is judged to be yes, that is, it is judged that the evaporator is in a normal safety operation state, then a refrigeration system continuous monitoring instruction is generated, and the refrigeration system is continuously monitored according to the refrigeration system continuous monitoring instruction. If the judgment is no, it means that the evaporator is judged not to be in a normal safe operating state, so an evaporator safety warning instruction is generated, and the evaporator is safety tested according to the evaporator safety warning instruction. In the present invention, by monitoring the coordinated operation relationship between the expansion valve and the evaporator in the refrigeration system, the principle that the expansion valve has a greater impact on the operating state of the evaporator during the overload operation period is used to perform an operation safety analysis of the evaporator when the operating state of the evaporator is greatly affected, more efficiently utilize data analysis resources, and analyze the operating state that is more prone to failure, so as to achieve faster and more efficient safety warnings, and improve the accuracy and efficiency of safety warnings for the refrigeration system.

[0065] In one embodiment, in step S100, obtaining the overload operation time period of the expansion valve according to the operation status information set includes:

[0066] Step S110: calculating the actual operating load of the expansion valve according to the operating status information set of the expansion valve;

[0067] Step S120: Screen out the actual operating load that is greater than or equal to the calibrated sampling load or is within the calibrated load range, and record the screened actual operating load as the target operating load;

[0068] Step S130: obtaining a target operating time point of the target operating load, and setting a sampling time period according to the target operating time point, wherein the sampling time period is a time range of a first time length before the target operating time point, the first time length is preset, and one target operating load corresponds to one sampling time period;

[0069] Step S140: calculating the load fluctuation rate of the expansion valve in the sampling time period according to the real-time operating load of the expansion valve in the sampling time period;

[0070] Step S150: filter out load fluctuation rates that are greater than or equal to the load fluctuation threshold, and record the sampling time period corresponding to the filtered load fluctuation rates as the overload operation time period of the expansion valve.

[0071] In this embodiment, the actual operating load indicates the workload of the expansion valve at the moment, specifically the load of the expansion valve when processing the refrigerant flow at the current moment. It should be understood that the greater the actual operating load, the greater the pressure borne by the expansion valve. The actual operating load of the expansion valve is calculated according to the operating status information set of the expansion valve to obtain the pressure borne by the expansion valve at different moments. By presetting the calibration sampling load and the calibration load range, and setting the actual operating load greater than or equal to the calibration sampling load or within the calibration load range as the target operating load, the target operating load is the load preliminarily screened out. At this time, it can be understood that when the expansion valve is at the target operating load, it is subjected to a certain pressure and also brings a certain pressure to the evaporator. However, in order to further screen out the state that has a greater impact on the evaporator and makes the evaporator more prone to failure, the target operating time point of the target operating load is further obtained, and the sampling time period is set according to the target operating time point. Among them, the sampling time period is a time range of the first time length before the target operating time point, the first time length is pre-set, and one target operating load corresponds to one sampling time period. For example, the target operation time point is represented by t1, and the first time length is 5 minutes. Then the sampling time period is 5 minutes before t1. Then, the load fluctuation rate of the expansion valve in the sampling time period is calculated according to the real-time operation load of the expansion valve in the sampling time period. The load fluctuation rate represents the fluctuation size of the load of the expansion valve in the sampling time period. The larger the load fluctuation rate, the larger the fluctuation of the load of the expansion valve in the sampling time period. If the load fluctuation rate is greater than or equal to the load fluctuation threshold, the sampling time period corresponding to the load fluctuation rate greater than or equal to the load fluctuation threshold is recorded as the overload operation time period of the expansion valve. Therefore, a large operating state range is first set so that when the conditions of the calibrated sampling load or the calibrated load range are met, the working state of the expansion valve has a greater impact on the evaporator. Then, in order to perform a more accurate analysis, the load fluctuation threshold is pre-set, and the overload time period corresponding to the load fluctuation rate greater than or equal to the load fluctuation threshold is screened out. During the overload time period, the expansion valve has a greater impact on the operation of the evaporator. Then, the working state of the evaporator is analyzed. When the working state of the evaporator fluctuates greatly, it means that the evaporator has poor stability and a tendency to fail when facing the same load impact, thereby realizing a safe prediction of the state of the evaporator based on the high load state of the expansion valve, so as to judge whether the operating safety of the expansion valve has a downward trend, and thus issue an early warning.Therefore, by screening the overload operation time period of the expansion valve, the subsequent safety operation analysis of the evaporator is limited to the operating state where the evaporator is subjected to a greater impact, so that the operation analysis of the evaporator is concentrated on the working state where failure is most likely to occur, thereby solving the problems in the prior art of insufficient analysis targeting, low accuracy of operating status analysis, low accuracy of operating monitoring results and low early warning efficiency due to the analysis of the evaporator without distinguishing time periods.

[0072] In one embodiment, step S110: calculating the actual operating load of the expansion valve according to the operating status information set of the expansion valve includes:

[0073] Step S111: extracting the expansion valve surface temperature, the expansion valve inlet temperature, the expansion valve outlet temperature, the expansion valve inlet pressure, the expansion valve outlet pressure and the valve body opening according to the operation status information set of the expansion valve;

[0074] Step S112: Calculate the current environmental impact coefficient based on the following formula according to the surface temperature of the expansion valve:

[0075] ;

[0076] Wherein, Ce is the current environmental impact coefficient, Cs is the reference environmental impact coefficient corresponding to the standard reference temperature, Tc is the preset temperature compensation coefficient, Tsev is the expansion valve surface temperature, and Tret is the standard reference temperature;

[0077] Step S113: generating a valve body basic load according to the expansion valve surface temperature, the expansion valve inlet temperature, the expansion valve outlet temperature, the expansion valve inlet pressure and the expansion valve outlet pressure;

[0078] Step S114: According to the current environmental impact coefficient and the valve body basic load, the actual operating load is generated based on the following formula:

[0079] ;

[0080] Among them, EVT is the actual operating load, Ce is the current environmental impact coefficient, and EVF is the valve body basic load.

[0081] In this embodiment, information is collected through pre-set sensors, and the expansion valve surface temperature, expansion valve inlet temperature, expansion valve outlet temperature, expansion valve inlet pressure, expansion valve outlet pressure and valve body opening are extracted from the operating status information of the expansion valve. Considering that the expansion valve is easily affected by the external environment, it is necessary to consider the environmental impact. Therefore, the current environmental impact coefficient is calculated through the expansion valve surface temperature. The current environmental impact coefficient is used to represent the impact of the environment in which the expansion valve is located on the load of the expansion valve. Specifically, the temperature compensation coefficient is pre-set, and the temperature compensation coefficient is pre-set based on different types of expansion valves. In addition, a standard reference temperature and a reference environmental impact coefficient corresponding to the standard reference temperature are also pre-set. Therefore, when calculating the current environmental impact coefficient, the reference environmental impact coefficient is used as the basic data, and the current environmental impact coefficient is calculated by To represent the proportion of the difference between the actual temperature of the current environment and the preset reference temperature to the standard reference temperature. Then, the current environmental impact coefficient is calculated. Furthermore, the valve body basic load used to represent the load of the expansion valve itself is generated by the expansion valve surface temperature, the expansion valve inlet temperature, the expansion valve outlet temperature, the expansion valve inlet pressure and the expansion valve outlet pressure. Finally, the current environmental impact coefficient and the valve body basic load are multiplied to obtain the actual operating load. Therefore, the working load state of the expansion valve is measured as a whole by combining various parameters. It is then possible to accurately analyze whether the operating state of the evaporator is stable under the high-load operating state of the expansion valve, thereby judging the ability of the evaporator to handle overload refrigeration requirements, and further conduct safety warnings for the entire refrigeration system.

[0082] In one embodiment, the valve body base load is generated based on the following formula:

[0083]

[0084] Among them, EVF is the basic load of the valve body, Tsev is the surface temperature of the expansion valve, Tvou is the outlet temperature of the expansion valve, and Tvin is the inlet temperature of the expansion valve. is the refrigerant density, Ae is the valve opening, Pvou is the expansion valve outlet pressure, and Pvin is the expansion valve inlet pressure.

[0085] In this embodiment, by calculating To represent the influence of the outlet temperature, inlet temperature and overall temperature of the expansion valve on the load of the expansion valve. The larger the value, the greater the load. To represent the influence of the temperature difference and pressure difference between the outlet and inlet of the expansion valve and the flow rate of the valve body and refrigerant on the load of the expansion valve. The value is proportional to the load of the expansion valve.

[0086] In another embodiment, the valve body basic load may be calculated in another manner by setting a proportionality coefficient, as follows:

[0087] ;

[0088] Among them, different from the previous embodiment, the first proportionality coefficient is set in this embodiment and the second proportionality factor , the first proportionality coefficient Used to represent the proportion of the outlet temperature, inlet temperature and overall temperature to the load of the expansion valve, the second proportional coefficient It is used to indicate the proportion of the temperature difference, pressure difference and flow rate of the valve body and refrigerant at the outlet and inlet of the expansion valve to the load of the expansion valve, wherein the first proportional coefficient and the second proportional coefficient are set according to the actual situation, such as setting the first proportional coefficient to 0.28 and the second proportional coefficient to 0.72. Alternatively, the first proportional coefficient is 0.36 and the second proportional coefficient is 0.64.

[0089] In one embodiment, step S140: calculating the load fluctuation rate of the expansion valve in the sampling time period according to the real-time operating load of the expansion valve in the sampling time period includes:

[0090] Step S141: calculating the load slope of two adjacent real-time operating loads of the expansion valve in the sampling time period;

[0091] Step S142: Calculating the load standard deviation S of each of the real-time operating loads;

[0092] Step S143: Generate a load fluctuation rate according to each of the load slopes and the load standard deviation based on the following formula:

[0093] ;

[0094] Wherein, LFR is the load fluctuation rate, is the preset fixed weight parameter, m is the serial number of the load slope, n is the number of load slopes, Kem is the mth load slope, is the mean of the slopes of each load, and S is the standard deviation of the load.

[0095] In this embodiment, the load slope of two adjacent real-time operating loads of the expansion valve in the sampling time period is first calculated, and then the load standard deviation of each real-time operating load is calculated, and then the load slope and the load standard deviation are combined to calculate the load fluctuation rate representing the fluctuation degree of the expansion valve load in the sampling time period. Among them, the fixed weight parameter Pre-set.

[0096] In one embodiment, step S200: generating the evaporation efficiency oscillation coefficient of the evaporator according to the overload operation time period and the overall operation data of the evaporator, comprises:

[0097] Step S210: extracting high-load evaporation operation data matching the overload operation time period from the overall operation data of the evaporator, wherein one overload operation time period corresponds to one high-load evaporation operation data;

[0098] Step S220: extracting evaporator pressure data, evaporator overall temperature data and evaporator vibration data from the high-load evaporation operation data;

[0099] Step S230: generating a refrigerant inlet enthalpy of the refrigerant at the evaporator inlet, a refrigerant outlet enthalpy of the refrigerant at the evaporator outlet, and a latent heat of evaporation of the refrigerant according to the evaporator pressure data and a preset standard pressure-enthalpy diagram;

[0100] In this step, the standard pressure-enthalpy diagram is preset so that after obtaining the evaporator pressure data, a quick query can be performed through the standard pressure-enthalpy diagram to obtain the refrigerant inlet enthalpy, the refrigerant outlet enthalpy and the refrigerant evaporation latent heat.

[0101] The refrigerant inlet enthalpy and the refrigerant outlet enthalpy are obtained by querying the data from the standard pressure-enthalpy diagram based on the evaporator pressure data. For example, if the type of refrigerant is HCR-22 refrigerant, the corresponding standard pressure-enthalpy diagram can be obtained according to the HCR-22 refrigerant, and then the corresponding enthalpy value can be found from the standard pressure-enthalpy diagram according to the state data of the refrigerant in the evaporator pressure data. The state data of the refrigerant includes but is not limited to the temperature, pressure, and mass fraction of the refrigerant.

[0102] The latent heat of evaporation of the refrigerant is a thermodynamic parameter closely related to the properties, temperature and pressure of the refrigerant. After obtaining the evaporator pressure data, the latent heat of evaporation of the refrigerant under the evaporator pressure data is queried from the standard pressure-enthalpy diagram according to the evaporator pressure data. For example, if the type of refrigerant is HCR-22 refrigerant, the standard pressure-enthalpy diagram corresponds to HCR-22 refrigerant, and different types of refrigerants correspond to different standard pressure-enthalpy diagrams.

[0103] Next, a basic evaporation efficiency of the evaporator is generated according to the refrigerant inlet enthalpy, the refrigerant outlet enthalpy and the refrigerant evaporation latent heat.

[0104] The basic evaporation efficiency is calculated by the following formula:

[0105] ;

[0106] in, is the basic evaporation efficiency, Hp2 is the refrigerant outlet enthalpy, Hp1 is the refrigerant inlet enthalpy, and Href is the latent heat of evaporation of the refrigerant.

[0107] The basic evaporation efficiency is used to measure the basic heating efficiency of the evaporator under the pressure provided by the evaporator pressure data.

[0108] Among them, the refrigerant outlet enthalpy, the refrigerant inlet enthalpy and the refrigerant evaporation latent heat are generally average values ​​within the overload operation period. For example, the enthalpy at the evaporator inlet has multiple values ​​corresponding to different sampling points, and the average value of the multiple enthalpies is the refrigerant outlet enthalpy. Similarly, the refrigerant inlet enthalpy and the refrigerant evaporation latent heat are also the same.

[0109] Step S240: extracting the evaporation inlet temperature, the evaporation outlet temperature and the evaporation middle section temperature from the overall temperature data of the evaporator, and generating the overall evaporation temperature according to the evaporation inlet temperature, the evaporation outlet temperature and the evaporation middle section temperature;

[0110] In this step, the overall temperature data of the evaporator is extracted according to the preset temperature sampling time nodes, so as to obtain the evaporation inlet temperature, evaporation outlet temperature and evaporation middle section temperature corresponding to each temperature sampling time node.

[0111] The evaporation inlet temperature is the temperature at the inlet of the evaporator. The evaporation outlet temperature is the temperature at the outlet of the evaporator. The evaporation middle section temperature is the average temperature of each pre-set temperature detection point. The temperature detection point is pre-set on the evaporator and is located between the inlet and outlet of the evaporator, including but not limited to the pipe, side wall, etc. of the evaporator.

[0112] Furthermore, the overall evaporation temperature is calculated by the following formula:

[0113] ;

[0114] in, is the overall evaporation temperature, Tri is the evaporation inlet temperature, Tro is the evaporation outlet temperature, and Trd is the evaporation middle temperature.

[0115] Furthermore, one temperature sampling time point corresponds to a set of evaporation inlet temperature, evaporation outlet temperature and evaporation middle temperature, and therefore, one temperature sampling time point corresponds to an overall evaporation temperature.

[0116] Step S250: extracting a sampled vibration amplitude and a sampled vibration frequency according to the evaporator vibration data;

[0117] Step S260: generating an evaporation efficiency factor according to the refrigerant inlet enthalpy, the refrigerant outlet enthalpy, the refrigerant evaporation latent heat, the overall evaporation temperature, the sampled vibration amplitude and the sampled vibration frequency;

[0118] Step S270: Calculate the standard deviation according to each of the evaporation efficiency factors, and record the standard deviation as the evaporation efficiency oscillation coefficient.

[0119] In this embodiment, high-load evaporation operation data is first extracted from the overall operation data of the evaporator based on the overload operation time period. When the number of the overload operation time periods is multiple, the high-load evaporation operation data has multiple corresponding data. Then, each of the high-load evaporation operation data is processed respectively, specifically by first obtaining the refrigerant inlet enthalpy, the refrigerant outlet enthalpy and the refrigerant evaporation latent heat to realize the calculation of the basic evaporation efficiency. Considering that the basic evaporation efficiency is impacted by temperature and vibration, the evaporation inlet temperature, the evaporation outlet temperature and the evaporation middle section temperature are further extracted from the overall temperature data of the evaporator, and the overall evaporation temperature is generated according to the evaporation inlet temperature, the evaporation outlet temperature and the evaporation middle section temperature. The sampling vibration amplitude and the sampling vibration frequency are also extracted according to the evaporator vibration data. Then, the evaporation efficiency factor is generated according to the refrigerant inlet enthalpy, the refrigerant outlet enthalpy, the refrigerant evaporation latent heat, the overall evaporation temperature, the sampling vibration amplitude and the sampling vibration frequency. The evaporation efficiency factor is a parameter for measuring the evaporation efficiency of the evaporator. The higher the evaporation efficiency factor, the higher the evaporation efficiency of the evaporator. Finally, the standard deviation is calculated according to each of the evaporation efficiency factors using the principle of standard deviation, so that the standard deviation is recorded as the evaporation efficiency oscillation coefficient. Therefore, the larger the evaporation efficiency oscillation coefficient is, the greater the fluctuation of the evaporator's evaporation efficiency is.

[0120] In one embodiment, the evaporation efficiency factor is generated based on the following formula:

[0121] ;

[0122] Among them, EEC is the evaporation efficiency factor, Hp2 is the refrigerant outlet enthalpy, Hp1 is the refrigerant inlet enthalpy, and Href is the latent heat of evaporation of the refrigerant. is the thermal expansion coefficient, N is the number of overall evaporation temperatures, is the fluctuation range of the overall evaporation temperature, t is the tth overall evaporation temperature, k is the vibration sensitivity coefficient, Avbt is the tth sampling vibration amplitude, and ft is the tth sampling vibration frequency.

[0123] The thermal expansion coefficient and the vibration sensitivity coefficient are pre-set based on the evaporator itself, and the vibration sensitivity coefficient indicates the degree of influence of vibration on the state of the evaporator. The thermal expansion coefficient indicates the degree of influence of temperature change on the evaporator. In this embodiment, the thermal expansion coefficient is set to 16.5, and the vibration sensitivity coefficient is set to 2.26.

[0124] In this embodiment, is the basic evaporation efficiency, It indicates the effect of the change of the overall temperature of the evaporator on the basic evaporation efficiency. It indicates the effect of vibration on the basic evaporation efficiency of the evaporator.

[0125] Further, in another embodiment, step S300: judging whether the evaporator is in a normal safe operation state according to the evaporation efficiency oscillation coefficient includes:

[0126] Step S310: determining whether the evaporation efficiency oscillation coefficient is greater than or equal to a standard evaporation oscillation coefficient;

[0127] Step S320: If the answer is yes, it means that the fluctuation is relatively large at this time, so it is determined that the evaporator is not in a normal safe operation state.

[0128] Step S330: If the answer is no, it is determined that the evaporator is in a normal safe operation state.

[0129] In one embodiment, the present application also provides a refrigeration system safety warning system based on operation status monitoring, such as Figure 2 As shown, the system comprises:

[0130] A load operation generating module, used for acquiring an operation status information set of an expansion valve and overall operation data of an evaporator in a refrigeration system, and acquiring an overload operation time period of the expansion valve according to the operation status information set;

[0131] A stability coefficient generating module, used for generating an evaporation efficiency oscillation coefficient of the evaporator according to the overload operation time period and the overall operation data of the evaporator;

[0132] A safety state judgment module, used for judging whether the evaporator is in a normal safety operation state according to the evaporation efficiency oscillation coefficient, wherein the normal safety operation state is preset;

[0133] The safety warning generation module is used to generate an evaporator safety warning instruction if the judgment is no, and perform safety detection on the evaporator according to the evaporator safety warning instruction.

[0134] In one embodiment, the load operation generation module is also used to: calculate the actual operating load of the expansion valve based on the operating status information set of the expansion valve; screen out the actual operating load that is greater than or equal to the calibrated sampling load or within the calibrated load range, and record the screened actual operating load as the target operating load; obtain the target operating time point of the target operating load, and set a sampling time period according to the target operating time point, wherein the sampling time period is a time range of a first time length before the target operating time point, the first time length is preset, and one target operating load corresponds to one sampling time period; calculate the load fluctuation rate of the expansion valve within the sampling time period based on the real-time operating load of the expansion valve within the sampling time period; screen out the load fluctuation rate that is greater than or equal to the load fluctuation threshold, and record the sampling time period corresponding to the screened load fluctuation rate as the overload operation time period of the expansion valve.

[0135] In one embodiment, the load operation generation module is further used to: extract the expansion valve surface temperature, the expansion valve inlet temperature, the expansion valve outlet temperature, the expansion valve inlet pressure, the expansion valve outlet pressure and the valve body opening according to the operation status information set of the expansion valve; and calculate the current environmental impact coefficient based on the following formula according to the expansion valve surface temperature:

[0136] ;

[0137] Wherein, Ce is the current environmental impact coefficient, Cs is the reference environmental impact coefficient corresponding to the standard reference temperature, Tc is the preset temperature compensation coefficient, Tsev is the surface temperature of the expansion valve, and Tret is the standard reference temperature; the valve body basic load is generated according to the expansion valve surface temperature, the expansion valve inlet temperature, the expansion valve outlet temperature, the expansion valve inlet pressure, and the expansion valve outlet pressure; according to the current environmental impact coefficient and the valve body basic load, the actual operation load is generated based on the following formula:

[0138] ;

[0139] Among them, EVT is the actual operating load, Ce is the current environmental impact coefficient, and EVF is the valve body basic load.

[0140] In one embodiment, the load operation generating module is further used to generate the valve body basic load based on the following formula:

[0141]

[0142] Among them, EVF is the basic load of the valve body, Tsev is the surface temperature of the expansion valve, Tvou is the outlet temperature of the expansion valve, and Tvin is the inlet temperature of the expansion valve. is the refrigerant density, Ae is the valve opening, Pvou is the expansion valve outlet pressure, and Pvin is the expansion valve inlet pressure.

[0143] The load operation generation module is also used to generate the valve body basic load based on the following formula:

[0144] ;

[0145] Among them, the first proportionality coefficient Used to represent the proportion of the outlet temperature, inlet temperature and overall temperature to the load of the expansion valve, the second proportional coefficient It is used to indicate the proportion of the expansion valve load accounted for by the temperature difference and pressure difference between the outlet and inlet of the expansion valve and the flow rate of the valve body and refrigerant.

[0146] In one embodiment, the load operation generation module is further used to: calculate the load slope of two adjacent real-time operation loads of the expansion valve in the sampling time period; calculate the load standard deviation of each real-time operation load; and generate the load fluctuation rate based on the following formula according to each load slope and the load standard deviation:

[0147] ;

[0148] Wherein, LFR is the load fluctuation rate, is the preset fixed weight parameter, m is the serial number of the load slope, n is the number of load slopes, Kem is the mth load slope, is the mean of the slopes of each load, and S is the standard deviation of the load.

[0149] In one embodiment, the stability coefficient generating module is further used to: extract high-load evaporation operation data matching the overload operation time period from the overall operation data of the evaporator, wherein one overload operation time period corresponds to one high-load evaporation operation data; generate the refrigerant inlet enthalpy of the refrigerant at the evaporator inlet, the refrigerant outlet enthalpy of the refrigerant at the evaporator outlet and the refrigerant evaporation latent heat according to the evaporator pressure data and a preset standard pressure-enthalpy diagram from the high-load evaporator; generate the basic evaporation efficiency of the evaporator according to the refrigerant inlet enthalpy, the refrigerant outlet enthalpy and the refrigerant evaporation latent heat; the basic evaporation efficiency is calculated by the following formula:

[0150] ;

[0151] in, is the basic evaporation efficiency, Hp2 is the refrigerant outlet enthalpy, Hp1 is the refrigerant inlet enthalpy, and Href is the refrigerant evaporation latent heat. The evaporation inlet temperature, evaporation outlet temperature and evaporation middle section temperature are extracted from the evaporator overall temperature data, and the overall evaporation temperature is generated according to the evaporation inlet temperature, evaporation outlet temperature and evaporation middle section temperature; the sampling vibration amplitude and sampling vibration frequency are extracted according to the evaporator vibration data; the evaporation efficiency factor is generated according to the refrigerant inlet enthalpy, refrigerant outlet enthalpy, refrigerant evaporation latent heat, overall evaporation temperature, sampling vibration amplitude and sampling vibration frequency; the standard deviation is calculated according to each of the evaporation efficiency factors, and the standard deviation is recorded as the evaporation efficiency oscillation coefficient.

[0152] In one embodiment, the stability coefficient generation module is further used to generate an evaporation efficiency factor based on the following formula:

[0153] ;

[0154] Among them, EEC is the evaporation efficiency factor, Hp2 is the refrigerant outlet enthalpy, Hp1 is the refrigerant inlet enthalpy, and Href is the latent heat of evaporation of the refrigerant. is the thermal expansion coefficient, N is the number of overall evaporation temperatures, is the fluctuation range of the overall evaporation temperature, t is the tth overall evaporation temperature, k is the vibration sensitivity coefficient, Avbt is the tth sampling vibration amplitude, and ft is the tth sampling vibration frequency.

[0155] In one embodiment, the safety state judgment module is further used to: judge whether the evaporation efficiency oscillation coefficient is greater than or equal to the standard evaporation oscillation coefficient; if it is judged to be yes, it means that the fluctuation is large at this time, so it is judged that the evaporator does not belong to the normal safe operation state. If it is judged to be no, it is judged that the evaporator belongs to the normal safe operation state.

[0156] In one embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned refrigeration system safety warning method based on operation status monitoring when executing the computer program.

[0157] In one embodiment, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned refrigeration system safety early warning method based on operation status monitoring are implemented.

[0158] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0159] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0160] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A refrigeration system safety early warning method based on operation status monitoring, characterized in that: The method comprises: Acquire an operation status information set of an expansion valve and overall operation data of an evaporator in a refrigeration system, and acquire an overload operation time period of the expansion valve according to the operation status information set; generating an evaporation efficiency oscillation coefficient of the evaporator according to the overload operation time period and the overall operation data of the evaporator; judging whether the evaporator is in a normal safe operation state according to the evaporation efficiency oscillation coefficient, wherein the normal safe operation state is preset; If the judgment is no, an evaporator safety warning instruction is generated, and a safety inspection of the evaporator is performed according to the evaporator safety warning instruction; Acquiring the overload operation time period of the expansion valve according to the operation status information set includes: Calculating the actual operating load of the expansion valve according to the operating status information set of the expansion valve; Screen out the actual operating load that is greater than or equal to the calibrated sampling load or within the calibrated load range, and record the screened actual operating load as the target operating load; Obtaining a target operating time point of the target operating load, and setting a sampling time period according to the target operating time point, wherein the sampling time period is a time range of a first time length before the target operating time point, the first time length is preset, and one target operating load corresponds to one sampling time period; Calculating the load fluctuation rate of the expansion valve in the sampling time period according to the real-time operating load of the expansion valve in the sampling time period; The load fluctuation rate that is greater than or equal to the load fluctuation threshold is screened out, and the sampling time period corresponding to the screened load fluctuation rate is recorded as the overload operation time period of the expansion valve.

2. The refrigeration system safety early warning method based on operation status monitoring according to claim 1 is characterized in that: Calculating the actual operating load of the expansion valve according to the operating status information set of the expansion valve includes: Extracting the expansion valve surface temperature, the expansion valve inlet temperature, the expansion valve outlet temperature, the expansion valve inlet pressure, the expansion valve outlet pressure and the valve body opening according to the expansion valve operation status information set; According to the surface temperature of the expansion valve, the current environmental impact coefficient is calculated based on the following formula: ； Wherein, Ce is the current environmental impact coefficient, Cs is the reference environmental impact coefficient corresponding to the standard reference temperature, Tc is the preset temperature compensation coefficient, Tsev is the expansion valve surface temperature, and Tret is the standard reference temperature; Generate a valve body basic load according to the expansion valve surface temperature, the expansion valve inlet temperature, the expansion valve outlet temperature, the expansion valve inlet pressure and the expansion valve outlet pressure; According to the current environmental impact coefficient and the valve body basic load, the actual operating load is generated based on the following formula: ； Among them, EVT is the actual operating load, Ce is the current environmental impact coefficient, and EVF is the valve body basic load.

3. The refrigeration system safety early warning method based on operation status monitoring according to claim 2 is characterized in that: The valve body base load is generated based on the following formula: Among them, EVF is the basic load of the valve body, Tsev is the surface temperature of the expansion valve, Tvou is the outlet temperature of the expansion valve, and Tvin is the inlet temperature of the expansion valve. is the refrigerant density, Ae is the valve opening, Pvou is the expansion valve outlet pressure, and Pvin is the expansion valve inlet pressure.

4. The refrigeration system safety early warning method based on operation status monitoring according to claim 3 is characterized in that: Calculating the load fluctuation rate of the expansion valve in the sampling time period according to the real-time operating load of the expansion valve in the sampling time period includes: Calculating the load slope of two adjacent real-time operating loads of the expansion valve in the sampling time period; Calculating the load standard deviation of each of the real-time operating loads; The load fluctuation rate is generated according to each of the load slopes and the load standard deviation based on the following formula: ； Wherein, LFR is the load fluctuation rate, is the preset fixed weight parameter, m is the serial number of the load slope, n is the number of load slopes, Kem is the mth load slope, is the mean of the slopes of each load, and S is the standard deviation of the load.

5. The refrigeration system safety early warning method based on operation status monitoring according to claim 1 is characterized in that: Generating the evaporation efficiency oscillation coefficient of the evaporator according to the overload operation time period and the overall operation data of the evaporator includes: Extracting high-load evaporation operation data matching the overload operation time period from the overall operation data of the evaporator, wherein one overload operation time period corresponds to one high-load evaporation operation data; extracting evaporator pressure data, evaporator overall temperature data and evaporator vibration data from the high-load evaporation operation data; generating a refrigerant inlet enthalpy of the refrigerant at the evaporator inlet, a refrigerant outlet enthalpy of the refrigerant at the evaporator outlet, and a latent heat of evaporation of the refrigerant according to the evaporator pressure data and a preset standard pressure-enthalpy diagram; Extracting the evaporation inlet temperature, the evaporation outlet temperature and the evaporation middle section temperature from the overall temperature data of the evaporator, and generating the overall evaporation temperature according to the evaporation inlet temperature, the evaporation outlet temperature and the evaporation middle section temperature; Extracting a sampled vibration amplitude and a sampled vibration frequency according to the evaporator vibration data; generating an evaporation efficiency factor according to the refrigerant inlet enthalpy, the refrigerant outlet enthalpy, the refrigerant evaporation latent heat, the overall evaporation temperature, the sampling vibration amplitude and the sampling vibration frequency; The standard deviation is calculated according to each of the evaporation efficiency factors, and the standard deviation is recorded as the evaporation efficiency oscillation coefficient.

6. The refrigeration system safety early warning method based on operation status monitoring according to claim 5 is characterized in that: The evaporation efficiency factor is generated based on the following formula: ; Among them, EEC is the evaporation efficiency factor, Hp2 is the refrigerant outlet enthalpy, Hp1 is the refrigerant inlet enthalpy, and Href is the latent heat of evaporation of the refrigerant. is the thermal expansion coefficient, N is the number of overall evaporation temperatures, is the fluctuation range of the overall evaporation temperature, t is the tth overall evaporation temperature, k is the vibration sensitivity coefficient, Avbt is the tth sampling vibration amplitude, and ft is the tth sampling vibration frequency.

7. A refrigeration system safety warning system based on operation status monitoring, characterized in that: The system comprises: A load operation generating module, used for acquiring an operation status information set of an expansion valve and overall operation data of an evaporator in a refrigeration system, and acquiring an overload operation time period of the expansion valve according to the operation status information set; A stability coefficient generating module, used for generating an evaporation efficiency oscillation coefficient of the evaporator according to the overload operation time period and the overall operation data of the evaporator; A safety state judgment module, used for judging whether the evaporator is in a normal safety operation state according to the evaporation efficiency oscillation coefficient, wherein the normal safety operation state is preset; A safety warning generation module, for generating an evaporator safety warning instruction if the judgment is no, and performing a safety inspection on the evaporator according to the evaporator safety warning instruction; The load operation generation module is also used to: calculate the actual operating load of the expansion valve according to the operating status information set of the expansion valve; screen out the actual operating load that is greater than or equal to the calibrated sampling load or within the calibrated load range, and record the screened actual operating load as the target operating load; obtain the target operating time point of the target operating load, and set a sampling time period according to the target operating time point, wherein the sampling time period is a time range of a first time length before the target operating time point, the first time length is preset, and one target operating load corresponds to one sampling time period; calculate the load fluctuation rate of the expansion valve within the sampling time period according to the real-time operating load of the expansion valve within the sampling time period; screen out the load fluctuation rate that is greater than or equal to the load fluctuation threshold, and record the sampling time period corresponding to the screened load fluctuation rate as the overload operation time period of the expansion valve.

Images