CN117346867A - Flowmeter checking method, checking experiment platform, device and equipment - Google Patents

Abstract

The invention relates to the technical field of drainage pipe networks, and discloses a flow meter checking method, a checking experiment platform, a device and equipment, wherein the method comprises the following steps: first flow of the flowmeter to be measured under different working conditions and different moments of the drainage pipeline is collected, and the working conditions comprise: fluid flow, fluid level, fluid flow rate; the fluid flow and the fluid flow rate are regulated by an electric valve connected with a water pump, and the fluid level is regulated by the height of a water blocking weir plate; the water retaining weir plate is arranged at the water outlet of the drainage pipeline; determining a second flow corresponding to the first flow through a preset method, wherein the second flow is a standard flow under different working conditions and different moments of the drainage pipeline; and carrying out error analysis based on the first flow and the corresponding second flow under different working conditions, and determining a checking result of the flowmeter to be tested. The method supports the checking of various working conditions, can comprehensively evaluate the performance of the flowmeter under various actual working conditions, and improves the comprehensiveness, accuracy and reliability of checking.

Description

Flowmeter checking method, checking experiment platform, device and equipment

Technical Field

The invention relates to the technical field of drainage pipe networks, in particular to a flowmeter checking method, a checking experiment platform, a checking device and equipment.

Background

The drainage network is an important component of urban infrastructure for drainage of sewage, rainwater and other waste water. In a drainage pipe network system, accurate measurement and metering of flow are critical to normal operation of the pipe network and reasonable utilization of resources. However, due to the particularities of the drainage pipe network, such as non-full pipe flow, more impurities, easy blockage, severe installation environment, difficult maintenance and the like, the flow metering of the drainage pipe network has a series of problems in actual use. Therefore, it is necessary to check the flow meter of the metering and drainage network.

However, the inventors have found that in some techniques, to increase the verification efficiency, it is common to compare a flow meter to be verified with a standard flow meter under a fixed condition, so as to determine the accuracy of the flow meter to be verified. The method for checking the flowmeter in the drainage pipe network is single, and cannot meet the checking requirements under different pipe network working conditions, so that the check of the flowmeter is incomplete, and the accuracy is low.

Disclosure of Invention

In view of the above, the invention provides a flowmeter checking method, a checking experiment platform, a device and equipment, so as to solve the problem that flowmeter checking is incomplete in the prior art.

In a first aspect, the present invention provides a method of calibrating a flow meter, the method comprising:

first flow of the flowmeter to be measured under different working conditions and different moments of the drainage pipeline is collected, and the working conditions comprise: fluid flow, fluid level, fluid flow rate; the fluid flow and the fluid flow speed are regulated by an electric valve connected with the water pump, and the fluid level is regulated by the height of the water blocking weir plate; the water retaining weir plate is arranged at the water outlet of the drainage pipeline;

determining a second flow corresponding to the first flow through a preset method, wherein the second flow is a standard flow under different working conditions and different moments of the drainage pipeline:

and carrying out error analysis based on the first flow and the corresponding second flow under different working conditions, and determining a checking result of the flowmeter to be tested.

The flowmeter checking method provided by the invention supports checking of various working conditions, can check under different liquid levels, flow rates and flow rates, realizes comprehensive evaluation of the performance of the flowmeter under various actual working conditions, and improves the comprehensiveness, accuracy and reliability of checking.

In an alternative embodiment, the preset method includes at least one of:

collecting second flow measured by a standard flow meter, wherein the standard flow meter is used for collecting flow in a return water pipeline; the water return pipeline is used for conveying water discharged from the water discharge pipeline back to the water discharge pipeline through the water pump;

or alternatively, the first and second heat exchangers may be,

acquiring the height and flow coefficient of a water retaining weir plate;

respectively collecting liquid levels at two sides of the water retaining weir plate, and calculating a liquid level difference value; the liquid level is determined by the metering equipment and the liquid level scale, wherein the metering equipment comprises a liquid level meter and/or a silt meter, and the liquid level measured by the liquid level scale is photographed by the image acquisition equipment and processed and determined;

calculating a second flow according to the height of the weir plate, the flow coefficient and the liquid level difference;

or alternatively, the first and second heat exchangers may be,

obtaining pipeline parameters of a drainage pipeline;

calculating a second flow by adopting a culvert method based on the pipeline parameters;

or alternatively, the first and second heat exchangers may be,

acquiring water pump parameters of a water pump;

calculating a second flow by adopting a water pump parameter conversion method based on the water pump parameters;

the second flow can be acquired by using the standard flowmeter, can be calculated by using a culvert method or a water pump parameter conversion method, and can be determined by selecting a proper second flow determination mode according to actual conditions, so that the method has selectivity and can ensure the reliability of experimental data.

In an alternative embodiment, the flow meter under test comprises at least one of:

ultrasonic flow meter, doppler flow meter, orifice flow meter, electromagnetic flow meter, turbine flow meter, venturi flow meter, elliptical gear flow meter, turbine flow meter, vortex street flow meter, royal flow meter, dual rotor flow meter, target flow meter, nozzle flow meter, weir and orifice flow meter.

The method not only supports the checking of various working conditions, but also supports the checking of various flowmeters, and has universality.

In an alternative embodiment, the error analysis based on the first flow and the corresponding second flow under different working conditions includes:

respectively calculating error values between the first flow and the second flow at the same moment under the same working condition; the error value includes at least one of the following; absolute error, relative error, mean absolute error, mean square error.

And adopting various error analysis methods to comprehensively evaluate the accuracy and consistency of different flow meters. The measuring error of the flowmeter to be measured can be comprehensively known, and scientific basis and reasonable explanation are provided for checking results.

In an alternative embodiment, after performing the error analysis, further comprising:

Based on the error analysis results, a graph is generated, the graph including at least one of: a scatter plot, a linear regression plot, a Bland Altman plot, a histogram, a box plot, the plot being used to characterize the error distribution between the first flow and the second flow and the trend of the change over time.

The results can be visually presented and the differences between different flow measurements or calculation methods and the reference flow can be compared by generating various charts.

In an alternative embodiment, after determining the verification result of the flowmeter to be tested, the method includes:

generating an analysis report, the analysis report comprising: and under different working conditions and at different moments, the difference between the first flow and the second flow and the predicted result predicted based on the change trend.

In a second aspect, the present invention provides a flow meter verification test platform, the platform being suitable for use in the above method, the platform comprising:

the inspection wells are communicated through drainage pipelines respectively, a flowmeter to be measured is arranged on the drainage pipelines, the flowmeter to be measured is connected with the drainage pipelines through flanges, and the drainage pipelines and the horizontal surface form a preset included angle, so that liquid flows out from the inspection well positioned at the most upstream;

The water collecting tank comprises a water pump, an electric valve and a standard flowmeter, the water collecting tank is used for collecting liquid flowing out of a drainage pipeline, the electric valve and the standard flowmeter are sequentially arranged at the outlet of the water pump, the electric valve is used for controlling the flow of the flowing-out liquid, and the standard flowmeter is used for measuring the flow flowing into an inspection well at the most upstream;

the inspection well is also communicated through a water return pipeline, and the water return pipeline is used for recycling water in the water collecting tank to the inspection well at the most upstream through a water pump;

the water retaining weir plate is arranged in the inspection well or at the water outlet at the most downstream and is used for adjusting the fluid level in the drainage pipeline;

the metering devices comprise a liquid level meter and/or a silt meter, are respectively arranged at the top of each inspection well and are used for monitoring the liquid level and/or the silt concentration of the corresponding inspection well; the metering device is also arranged at two sides of the water blocking weir plate and is used for respectively monitoring the liquid level and/or the sludge concentration at two sides of the water blocking weir plate.

In an alternative embodiment, the platform further comprises:

the liquid level scale is respectively arranged in each inspection well and is used for measuring the liquid level of the inspection well; the liquid level scale is also arranged at two sides of the water blocking weir plate and used for respectively measuring the liquid level at two sides of the water blocking weir plate;

The image acquisition equipment is used for shooting pictures of the liquid level scale and processing the pictures to obtain liquid level scale values.

In an alternative embodiment, the flowmeter to be measured is a non-contact flowmeter, and the platform further comprises:

the rotating device comprises a rotatable support, a flowmeter fixing table and an angle sensor, wherein the rotating device is arranged at the water inlet of the drainage pipeline of one inspection well, the flowmeter fixing table is used for installing a non-contact flowmeter, the rotatable support is used for driving the flowmeter fixing table to rotate, and the angle sensor is used for detecting the angle between the non-contact flowmeter and the bottom of the drainage pipeline.

In a third aspect, the present invention provides a flow meter verification apparatus comprising:

the collection module is used for collecting first flow of the flowmeter to be measured under different working conditions of the drainage pipeline and different moments, and the working conditions comprise: fluid flow, fluid level, fluid flow rate; the fluid flow and the fluid flow speed are regulated by an electric valve connected with the water pump, and the fluid level is regulated by the height of the water blocking weir plate; the water retaining weir plate is arranged at the water outlet of the drainage pipeline;

the determining module is used for determining a second flow corresponding to the first flow through a preset method, wherein the second flow is a standard flow under different working conditions and different moments of the drainage pipeline:

And the checking module is used for carrying out error analysis on the basis of the first flow and the corresponding second flow under different working conditions and determining a checking result of the flowmeter to be tested.

In a fourth aspect, the present invention provides a computer device comprising: the flowmeter checking method comprises the steps of storing a memory and a processor, wherein the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions, so that the flowmeter checking method of the first aspect or any corresponding embodiment of the first aspect is executed.

It should be noted that, because the flow meter checking device, the computer device and the computer readable storage medium provided by the invention correspond to the flow meter checking method. Therefore, regarding the beneficial effects of the flow meter checking device, the computer device and the computer readable storage medium, please refer to the description of the corresponding beneficial effects of the flow meter checking method above, which is not repeated herein.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a flow diagram of a flow meter verification method according to an embodiment of the invention;

FIG. 2 is a schematic structural view of a flow meter verification experiment platform according to an embodiment of the invention;

FIG. 3 is a schematic diagram of a scatter plot according to an embodiment of the invention;

fig. 4 is a schematic structural view of a rotating apparatus according to an embodiment of the present invention;

FIG. 5 is a block diagram of a flow meter verification device according to an embodiment of the invention;

FIG. 6 is a schematic diagram of the hardware architecture of a computer device according to an embodiment of the present invention;

reference numerals illustrate: 1-inspection well, 11-metering equipment, 12-flange, 13-image acquisition equipment, 14-liquid level scale, 2-drainage pipeline, 3-water collecting tank, 31-water pump, 32-electric valve, 33-standard flowmeter, 4-water return pipeline, 5-water retaining weir plate, 6-rotating device, 61-rotatable support and 62-flowmeter fixed table.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Drainage networks are vital components in urban infrastructure for the drainage of sewage, rainwater and other waste water, maintaining urban environmental sanitation and public health. In a drainage pipe network system, accurate measurement and metering of flow are key to ensuring stable operation of the pipe network and reasonable utilization of resources. However, the particularities of the drainage network lead to a series of challenges and problems in the flow metering process, as well as presenting some new challenges to flow meter verification. Common problems in flow metering processes are for example:

non-full pipe flow phenomenon: under the condition that the drainage pipe network is always provided with a non-full pipe flow, namely the water level in the pipe is not full, the traditional flowmeter is difficult to accurately measure the flow, and the metering accuracy is affected;

accumulation and blockage of impurities: solid impurities are often carried in the drainage pipe network and are easy to accumulate at the measuring part of the flowmeter, so that the measuring accuracy is reduced and even the pipeline is blocked;

the existing checking method is single, checking is only carried out under fixed working conditions, and the method cannot be suitable for working conditions under different working environments, so that checking is incomplete and low in accuracy.

In view of the above, in accordance with an embodiment of the present invention, there is provided a flow meter checking method embodiment, it should be noted that the steps illustrated in the flow chart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flow chart, in some cases the steps illustrated or described may be performed in an order different from that herein.

In this embodiment, a flow meter checking method is provided, which may be executed by a server terminal, a terminal, etc., and fig. 1 is a flowchart of the flow meter checking method according to an embodiment of the present invention, as shown in fig. 1, where the flowchart includes the following steps:

step S101, collecting first flow of the flowmeter to be measured under different working conditions and different moments of the drainage pipeline 2, where the working conditions include: fluid flow, fluid level, fluid flow rate; wherein, the fluid flow and the fluid flow rate are regulated by an electric valve 32 connected with a water pump 31, and the fluid liquid level is regulated by the height of a water baffle plate 5; the water blocking weir plate 5 is arranged at the water outlet of the drainage pipeline 2.

In this embodiment, a flow meter checking experiment platform may be shown with reference to fig. 2. In some alternative embodiments, the flow meter under test comprises at least one of: ultrasonic flow meter, doppler flow meter, orifice flow meter, electromagnetic flow meter, turbine flow meter, venturi flow meter, elliptical gear flow meter, turbine flow meter, vortex street flow meter, royal flow meter, dual rotor flow meter, target flow meter, nozzle flow meter, weir, orifice and other flow meters. In this embodiment, the to-be-measured flowmeter may be installed on the checking experiment platform according to the installation type of the to-be-measured flowmeter, which is suitable for various flowmeter types, and has versatility, for example, an ultrasonic flowmeter may be installed at the connection position of the two sections of drainage pipelines 2, and a doppler flowmeter may be installed on the inner wall of the drainage pipeline 2, so as to check the to-be-measured flowmeter.

After the flowmeter to be measured is installed, the water pump 31 is started, so that the verification experiment platform starts to operate. Collecting first flow of a flowmeter to be measured under different working conditions of the drainage pipeline 2 at different moments, for example, collecting first flow at continuous moments under different fluid flow by taking the fluid flow as a variable; or taking the fluid level as a variable, and collecting first flow at continuous moments under different fluid levels; or taking the fluid flow rate as a variable, and collecting the first flow at continuous moments under different fluid flow rates. In this embodiment, the pipe flow is preferably collected every predetermined time, such as every 0.5 minutes. The different working conditions in the embodiment can be used for simulating liquid level change, flow velocity change, flow rate change and the like caused by non-full pipe flow phenomenon, sundry accumulation, blockage and the like. By collecting the first flow of the flowmeter to be tested under different working conditions and different moments of the drainage pipeline 2, the flowmeter to be tested can be comprehensively checked.

The fluid flow rate and the fluid flow rate are regulated by the electric valve 32 connected to the water pump 31, that is, the opening degree of the electric valve 32 can be controlled to control the fluid flow rate and the fluid flow rate. The fluid level is regulated by the water deflector weir 5, i.e. the baffle height can be regulated to regulate the fluid level. Wherein, the height of the baffle plate can be adjusted to ensure that the liquid level of the position of the installed flowmeter to be measured is 5cm, 1/3 of the diameter of the drainage pipe, 1/2 of the diameter of the drainage pipe, 2/3 of the diameter of the drainage pipe and the like; the flow rate control range is set to 0.05m/s, 0.1m/s, 0.5m/s, 1.0m/s, 2.0m/s, etc.

Step S102, determining a second flow corresponding to the first flow by a preset method, wherein the second flow is a standard flow under different working conditions and different moments of the drainage pipeline 2.

In some alternative embodiments, the second flow rate may be determined by the following preset method:

collecting the second flow measured by the standard flow meter 33 while collecting the first flow of the flow meter to be measured under different working conditions and different moments of the drainage pipeline 2, wherein the standard flow meter 33 is used for collecting the flow in the return pipeline 4; the water return pipe 4 is used for conveying water discharged from the water discharge pipe 2 back to the water discharge pipe 2 through the water pump 31;

the standard flow meter 33 may be a precise flow meter that is recognized by the certification authority, and the standard flow meter 33 in this embodiment may be an electromagnetic flow meter. In this embodiment, the standard flowmeter 33 may be used to collect the second flow while collecting the first flow of the flowmeter under test under different conditions and different moments of the drain pipe 2. However, in the present embodiment, the flow rate collected by the standard flow meter 33 is the flow rate in the return pipe 4, and the return pipe 4 may be as shown in fig. 2. Specifically, the water in the water collecting tank 3 is pumped to the water return pipeline 4 by the water pump 31, then the water is conveyed to the water drain pipeline 2 by the water return pipeline 4, then the water is discharged to the water collecting tank 3 by the water drain pipeline 2, and the pumping process is performed through the standard flowmeter 33. At this time, the water volume measured by the standard flowmeter 33 is consistent with the water volume measured by the flowmeter to be measured in a unit time, but is not affected by the environment in the drain pipe 2, and the accuracy of the measurement of the standard flowmeter 33 is ensured.

In some alternative embodiments, the second flow rate may be determined by the following preset method:

acquiring the weir plate height and the flow coefficient of the water blocking weir plate 5;

respectively collecting liquid levels at two sides of the water retaining weir plate 5, and calculating a liquid level difference value; the liquid level is determined by a metering device 11 and a liquid level scale 14, wherein the metering device comprises a liquid level meter and/or a silt meter, and the liquid level measured by the liquid level scale 14 is shot and processed by an image acquisition device 13;

and calculating a second flow according to the height of the weir plate, the flow coefficient and the liquid level difference.

In this embodiment, the height of the water blocking weir 5 is adjustable to adjust the fluid level in the drainage pipe 2, and the height of the water blocking weir 5 can be obtained according to a distance sensor (not shown in the figure) disposed inside the water blocking weir 5. The flow coefficient is an empirical value and can be obtained through experimental determination according to the shape, the size, the water flow characteristics and other factors of the actual baffle weir.

Further, as can be seen from fig. 2, a metering device 11 and a level gauge 14 may be provided on both sides of the water barrier 5, respectively, to collect the level of the water on both sides of the water barrier 5. The metering device 11 can be a liquid level meter, and can directly meter the water level height in the drainage pipeline 2 by adopting the liquid level meter; the metering device 11 can also be a silt meter, and the thickness of the silt in the drainage pipeline 2 can be directly metered by adopting the silt meter; the metering device 11 may also comprise both a level meter and a sludge meter.

In particular, in view of the long-term use of the drain pipe, there may be sludge at the bottom of the drain pipe 2, thereby affecting the accuracy of the liquid level measurement, resulting in deviation of the result of the check. Therefore, the actual liquid level height inside the drainage pipeline 2 can be determined by adopting a mode of mutually checking the silt meter, the liquid level meter and the liquid level scale, so that the checking accuracy of the flowmeter to be tested is improved.

And finally, calculating a second flow according to the height of the weir plate, the flow coefficient and the liquid level difference. And the second flow is calculated in a mode of liquid level difference at two sides of the water retaining weir plate, and the calculated second flow has higher accuracy.

In some alternative embodiments, the second flow rate may be determined by the following preset method:

obtaining pipeline parameters of the drainage pipeline 2, wherein the pipeline parameters comprise: diameter, length, material, gradient, flow rate, pressure, temperature, etc. of the pipeline.

And calculating the second flow by adopting a culvert method based on the pipeline parameters.

In some alternative embodiments, the second flow rate may be determined by the following preset method:

acquiring water pump parameters of the water pump 31; the parameters of the water pump include: water pump flow, power, rotation speed, water inlet pressure and water outlet pressure of the water pump, etc.

Calculating a second flow by adopting a water pump parameter conversion method based on the water pump parameters;

it should be noted that, the second flow rate is consistent with the working condition corresponding to the first flow rate and the time period, for example, after the working condition is determined, the flow rates from time a to time B are collected, where the first flow rates from time a to time B are collected by the flow meter to be measured, the second flow rates from time a to time B may be collected by the standard flow meter 33, or the second flow rates from time a to time B are calculated.

In this embodiment, the inlet control equation coefficient under the submerged and non-submerged conditions can be calibrated by genetic algorithm according to the liquid level and the flow sensed by the standard flowmeter 33, so as to calculate the pipeline flow in the preset time period.

In this embodiment, the standard flowmeter 33 may be used to collect the second flow rate; the second flow can be calculated according to the liquid level difference at the two sides of the water retaining weir plate; the second flow rate may also be calculated using a culvert method or a water pump parameter conversion method. The proper second flow determination mode can be selected according to the actual checking condition, so that the method has selectivity and can ensure the reliability of experimental data. Furthermore, the second flow can be calculated by adopting the modes at the same time, so that the reliability of the modes is comprehensively evaluated, and the selection of the subsequent calculation mode is facilitated.

And step S103, performing error analysis based on the first flow and the corresponding second flow under different working conditions, and determining a checking result of the flowmeter to be tested.

In some alternative embodiments, the error analysis based on the first flow and the corresponding second flow under different working conditions includes:

respectively calculating error values between the first flow and the second flow at the same moment under the same working condition; the error value includes at least one of the following; absolute error, relative error, mean absolute error, mean square error.

In this embodiment, the first flow is used as a measurement value, and the second flow is used as a reference value, so as to perform error analysis on the measurement value and the reference value. And taking the error analysis result as a checking result, namely the error existing in the flow to be detected.

The error of the flow meter can be measured by calculating the absolute difference between the measured value and the reference value, which is typically expressed in absolute terms. The absolute error may be calculated as a ratio of the reference value and the magnitude of the error may be expressed in percent. The average of all absolute errors can also be calculated for evaluating the average error magnitude of the flow meter. And the variance analysis can be used for comparing the differences among the flow data detected by the flowmeter to be detected, the culvert method and the water pump parameter conversion method according to the multiple groups of flow data obtained by calculation. First, the square sum of deviation SS in each measurement mode is calculated _e Sum of squares of deviation SS between all measurement modes _t Next, the degree of freedom df in each measurement mode is calculated _e Degree of freedom df between all measurement modes _t Then calculate the mean square MS in each measurement mode _e Mean square MS between all measurement modes _t Finally, a statistic f=ms is constructed _t /MS _e And calculating and judging whether the statistical significance exists. And whether there is a large difference between the plurality of flow rate data or not, to verify the error of each second flow rate determination method itself.

In the embodiment, the checking of various working conditions and various flowmeters is supported, the checking can be performed under different liquid levels, flow rates and flow rates, the performance of the flowmeter under various actual working conditions is comprehensively evaluated, and the comprehensiveness, accuracy and reliability of the checking are improved.

In addition, in this embodiment, various error analysis methods are adopted to comprehensively evaluate the accuracy and consistency of different flow meters. The measuring error of the flowmeter to be measured can be comprehensively known, and scientific basis and reasonable explanation are provided for checking results.

Further, in this embodiment, time series data analysis is further performed on the flow measured by the standard flow meter, the flow measured by the flow meter to be measured, the flow calculated by the culvert method, and the flow calculated by the water pump parameter conversion method, and the accuracy of different calculation modes is compared when the flow and the flow velocity change with time. According to the analysis result, data reference can be provided for the next check, so that a proper reference flow determination method is selected.

In some alternative embodiments, when the first flow and the second flow under one working condition are determined, the next working condition is performed.

After the testing and analysis of the current condition is completed, the system will automatically begin testing the next condition. Including adjusting the installation angle, the change of the height of the weir plate, the change of the flow of the water pump, etc. For each condition test, data collection and error analysis will be automated so that the system will evaluate the performance of the various flow measurement or calculation methods comprehensively.

In the embodiment, the whole process can automatically control the flow, record data and perform error analysis, so that the checking efficiency and reliability are greatly improved, the human intervention is reduced, and the human error is reduced.

In some alternative embodiments, after performing the error analysis, further comprising:

based on the error analysis results, a graph is generated, the graph including at least one of: a scatter plot, a linear regression plot, a Bland Altman plot, a histogram, a box plot, the plot being used to characterize the error distribution between the first flow and the second flow and the trend of the change over time.

After error analysis, various charts may be generated to visually demonstrate the results and compare the differences between different flow measurements or calculation methods and the reference flow. For example, a scatter diagram, as shown with reference to fig. 3, may show the relationship between the measured value and the reference value. The horizontal axis represents the reference flow value, the vertical axis represents the measured value, and each point represents one measurement sample. The distribution and correlation between the measured value and the reference value can be intuitively seen through the scatter diagram. As another example, bland-Altman plots may show differences and consistency between the two measurement methods. The horizontal axis represents the average (average of the reference flow and the measured flow) and the vertical axis represents the difference (measured flow minus the reference flow), and the average bias line and upper and lower limits can be plotted for analysis of the consistency and bias between the two methods. If one wants to compare the error magnitudes of different flow measurements or calculation methods, one can use a histogram to show the Mean Absolute Error (MAE), mean Square Error (MSE), etc. indicators for each method. Each bar represents a method, and bar height represents the value of the corresponding error indicator. The box plot may show the error distribution for different flow measurements or calculation methods. Each box represents the error distribution of a method and contains the information of the median, the upper and lower quartiles and the outliers, so that the error range and the outliers of each method can be intuitively seen.

In this embodiment, the results and the differences between the different flow measurement or calculation methods and the reference flow can be intuitively displayed by the generated various charts.

In some alternative embodiments, after determining the verification result of the flowmeter under test, the method includes:

generating an analysis report, the analysis report comprising: and under different working conditions and at different moments, the difference between the first flow and the second flow and the predicted result predicted based on the change trend.

After the testing and analysis of all working conditions are finished, the system synthesizes the results of all working conditions, comprehensively evaluates the accuracy of different flow measurement or calculation methods, and generates a total report. The report will summarize the error conditions of various methods, compare their merits and merits, and provide accurate selection and improvement suggestions for users.

The automatically generated analysis report may include a description and an explanation of the above chart detailing the differences between different flow measurement or calculation methods and the reference flow and the accuracy evaluation results. The report can also be summarized and analyzed aiming at test results under working conditions of different flow rates, different liquid levels, different flow rates and the like, and indicates the applicability and the advantages and disadvantages of each method under different working conditions.

In this embodiment, there is also provided a flow meter checking experiment platform, which is suitable for the embodiment and the preferred implementation of the flow meter checking method, and fig. 2 is a flow meter checking experiment platform according to an embodiment of the present invention, where the platform includes:

the inspection wells 1 are arranged side by side, the inspection wells 1 are respectively communicated through a drainage pipeline 2, a flowmeter to be measured is arranged on the drainage pipeline 2, and a preset included angle is formed between the drainage pipeline 2 and the horizontal plane, so that liquid flows out of the inspection well 1 positioned at the most upstream. In the present embodiment, the number of inspection wells 1 is 3, and the inspection wells 1 are an upstream inspection well 1, a midstream inspection well 1 and a downstream inspection well 1.

The platform further comprises: the flange 12, the flowmeter to be measured is connected with the drainage pipeline 2 through the flange 12, and the flange 12 is arranged on the water inlet and the water outlet of the midstream inspection well 1 and is used for connecting the flowmeter to be measured which needs to be connected through the drainage pipeline 2.

The water collecting tank 3 comprises a water pump 31, an electric valve 32 and a standard flowmeter 33, the water collecting tank 3 is used for collecting liquid flowing out of the water drainage pipeline 2, the electric valve 32 and the standard flowmeter 33 are sequentially arranged at the outlet of the water pump 31, the electric valve 32 is used for controlling the flowing-out liquid flow, and the standard flowmeter 33 is used for measuring the flow flowing into the inspection well 1 at the most upstream.

The water return pipeline 4, the inspection well 1 is also communicated through the water return pipeline 4, and the water return pipeline 4 is used for recycling water in the water collecting tank 3 to the most upstream inspection well 1 through the water pump 31.

A water baffle 5, which is arranged in the inspection well 1 or at the water outlet at the most downstream, is used for adjusting the fluid level in the drainage pipeline 2. The water baffle 5 can adjust the fluid level of the drainage pipe 2 by adjusting the height of the baffle.

A plurality of metering devices 11, wherein the metering devices 11 comprise liquid level meters and/or sludge meters which are respectively arranged at the top of each inspection well 1 and are used for monitoring the liquid level and/or the sludge concentration of the corresponding inspection well 1; the metering device 11 is also arranged on both sides of the water deflector weir 5 for monitoring the liquid level and/or sludge concentration on both sides of the water deflector weir 5, respectively.

The platform workflow is as follows: the water pump 31 is started, when the water blocking weir plate 5 is in a state of 0 in height, the flow is controlled through the electric valve 32, and when the pipe fullness reaches 50%, the flow is fixed and kept for 5 minutes, then the water in the water collecting tank 3 is conveyed to the upstream inspection well 1 through the water return pipe 4 by the water pump 31, then the water is conveyed to the drainage pipe 2 through the water outlet of the upstream inspection well 1, and is discharged into the water collecting tank 3 through the water outlet of the drainage pipe 2 after passing through the flowmeter to be detected, so that circulation is formed. During this process, the metering device 11 at the top of each manhole 1 monitors the liquid level and/or sludge concentration of the corresponding manhole 1 in real time. And records the liquid level and/or sludge concentration collected by all the metering devices 11, the flow measured by the flow meter to be measured, the flow measured by the standard flow meter 33, the opening of the electric valve 32, the angle of the angle sensor, the perceived height of the baffle displacement sensor (not shown in the figure), the running current and frequency of the water pump 31, the water outlet pressure of the water pump 31, and the like. The data acquisition frequency was once every 0.5 minutes for 5 minutes. Then, the working conditions are changed, for example, the control of different flow and liquid level in the pipe is realized by adjusting the opening of the electric valve 32 and the height of the water blocking weir plate 5, and data acquisition is performed again.

Referring to fig. 4, in some alternative embodiments, the platform further comprises:

a liquid level gauge 14 disposed inside each manhole 1, respectively, for measuring the liquid level of the manhole 1; the liquid level gauge 14 is also arranged on both sides of the water baffle 5 for measuring the liquid level on both sides of the water baffle 5, respectively.

The image acquisition device 13 is used for taking a picture of the liquid level scale 14 and processing the picture to obtain a liquid level scale value. In this embodiment, an artificial intelligent recognition technology may be used to process the image, and compare the recognition result with the measurement data of the measurement device 11, so as to improve the accuracy of the liquid level determination. The liquid level data monitored by each metering device 11 and the liquid level data which are identified by each image acquisition device 13 in an artificial intelligence way are respectively subjected to time series data analysis, so that the accuracy and the reliability of the flow metering of the drainage pipe network are improved.

In this embodiment, the influence of the sludge in the drainage pipeline 2 on the liquid level is fully considered, the liquid level result measured by the liquid level scale 14 and the metering data of the metering device 11 are mutually checked, the accuracy of liquid level determination can be improved, the liquid level and/or the sludge concentration at two sides of the water retaining weir plate 5 can be collected, the second flow is calculated in a mode of calculating the liquid level difference, and the accuracy of checking the flowmeter to be tested can be effectively improved.

Referring to fig. 4, in some alternative embodiments, the flow meter to be measured is a non-contact flow meter, such as: doppler flow meters, etc., the platform further comprises:

the rotating device 6 comprises a rotatable support 61, a flowmeter fixing table 62 and an angle sensor (not shown in the figure), the rotating device 6 is arranged at the water inlet of the drainage pipeline 2 of one inspection well 1, the flowmeter fixing table 62 is used for installing a non-contact flowmeter or other flowmeters which are installed in the same mode as the non-contact flowmeter, the rotatable support 61 is used for driving the flowmeter fixing table 62 to rotate, and the angle sensor is used for detecting the angle between the non-contact flowmeter and the bottom of the drainage pipeline 2. The installation position of the non-contact flowmeter in the pipeline can be selected to be the center of the pipeline bottom, or the 4 o 'clock position, the 5 o' clock position and the like. The rotatable support 61 may be manually oscillated or electrically driven.

In the embodiment, the experiment platform can verify the accuracy of various types of flowmeters, and has universality, flexibility and wide applicability. The platform also supports the checking of various working conditions, including different liquid levels, flow rates and flow rates, and can comprehensively evaluate the performance of the flowmeter under various actual working conditions, so that the accuracy and precision of checking the flowmeter to be tested are improved. And the experiment platform has the capability of automatically checking the flowmeter, so that the checking efficiency and reliability are greatly improved, and the human error is reduced.

The control method suitable for the experimental platform is already described in the above embodiments and will not be repeated.

In this embodiment, a flow meter checking device is further provided, and the flow meter checking device is used to implement the foregoing embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

The present embodiment provides a flow meter checking device, as shown in fig. 5, including:

the collection module 501 is configured to collect first flow of the flowmeter to be measured under different working conditions and different moments of the drainage pipeline 2, where the working conditions include: fluid flow, fluid level, fluid flow rate; wherein, the fluid flow and the fluid flow rate are regulated by an electric valve 32 connected with a water pump 31, and the fluid liquid level is regulated by the height of a water baffle plate 5; the water retaining weir plate 5 is arranged at the water outlet of the drainage pipeline 2;

the determining module 502 is configured to determine, by a preset method, a second flow corresponding to the first flow, where the second flow is a standard flow under different working conditions and different moments of the drainage pipeline 2:

And the checking module 503 is configured to perform error analysis based on the first flow and the corresponding second flow under different working conditions, and determine a checking result of the flowmeter to be tested.

The flow meter verification device in this embodiment is in the form of a functional unit, where the unit refers to an ASIC circuit, a processor and memory executing one or more software or fixed programs, and/or other devices that can provide the above functions.

Further functional descriptions of the above respective modules and units are the same as those of the above corresponding embodiments, and are not repeated here.

The embodiment of the invention also provides computer equipment, which is provided with the flowmeter checking device shown in the figure 5.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a computer device according to an alternative embodiment of the present invention, as shown in fig. 6, the computer device includes: one or more processors 10, memory 20, and interfaces for connecting the various components, including high-speed interfaces and low-speed interfaces. The various components are communicatively coupled to each other using different buses and may be mounted on a common motherboard or in other manners as desired. The processor may process instructions executing within the computer device, including instructions stored in or on memory to display graphical information of the GUI on an external input/output device, such as a display device coupled to the interface. In some alternative embodiments, multiple processors and/or multiple buses may be used, if desired, along with multiple memories and multiple memories. Also, multiple computer devices may be connected, each providing a portion of the necessary operations (e.g., as a server array, a set of blade servers, or a multiprocessor system). One processor 10 is illustrated in fig. 6.

The processor 10 may be a central processor, a network processor, or a combination thereof. The processor 10 may further include a hardware chip, among others. The hardware chip may be an application specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general-purpose array logic, or any combination thereof.

Wherein the memory 20 stores instructions executable by the at least one processor 10 to cause the at least one processor 10 to perform the methods shown in implementing the above embodiments.

The memory 20 may include a storage program area that may store an operating system, at least one application program required for functions, and a storage data area; the storage data area may store data created from the use of the computer device of the presentation of a sort of applet landing page, and the like. In addition, the memory 20 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, memory 20 may optionally include memory located remotely from processor 10, which may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk, or solid state disk; the memory 20 may also comprise a combination of the above types of memories.

The computer device also includes a communication interface 30 for the computer device to communicate with other devices or communication networks.

The embodiments of the present invention also provide a computer readable storage medium, and the method according to the embodiments of the present invention described above may be implemented in hardware, firmware, or as a computer code which may be recorded on a storage medium, or as original stored in a remote storage medium or a non-transitory machine readable storage medium downloaded through a network and to be stored in a local storage medium, so that the method described herein may be stored on such software process on a storage medium using a general purpose computer, a special purpose processor, or programmable or special purpose hardware. The storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, a solid state disk or the like; further, the storage medium may also comprise a combination of memories of the kind described above. It will be appreciated that a computer, processor, microprocessor controller or programmable hardware includes a storage element that can store or receive software or computer code that, when accessed and executed by the computer, processor or hardware, implements the methods illustrated by the above embodiments.

Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.

Claims (11)

1. A method of meter verification, the method comprising:

first flow of the flowmeter to be measured under different working conditions of the drainage pipeline (2) and different moments is collected, and the working conditions comprise: fluid flow, fluid level, fluid flow rate; wherein the fluid flow rate and the fluid flow velocity are regulated by an electric valve (32) connected with a water pump (31), and the fluid liquid level is regulated by the height of a water blocking weir plate (5); the water retaining weir plate (5) is arranged at the water outlet of the drainage pipeline (2);

determining a second flow corresponding to the first flow through a preset method, wherein the second flow is a standard flow under different working conditions and different moments of the drainage pipeline (2):

and carrying out error analysis based on the first flow and the corresponding second flow under different working conditions, and determining a checking result of the flowmeter to be tested.

2. The method of claim 1, wherein the predetermined method comprises at least one of:

-collecting the second flow measured by a standard flow meter (33), the standard flow meter (33) being used for collecting the flow in the return conduit (4); the water return pipeline (4) is used for conveying water discharged from the water discharge pipeline (2) back to the water discharge pipeline (2) through the water pump (31);

or alternatively, the first and second heat exchangers may be,

acquiring the weir plate height and the flow coefficient of the water blocking weir plate (5);

liquid levels at two sides of the water retaining weir plate (5) are respectively collected, and a liquid level difference value is calculated; the liquid level is determined by a metering device (11) and a liquid level scale (14), wherein the metering device comprises a liquid level meter and/or a silt meter, and the liquid level measured by the liquid level scale (14) is shot and processed by an image acquisition device (13);

calculating the second flow according to the height of the weir plate, the flow coefficient and the liquid level difference;

or alternatively, the first and second heat exchangers may be,

acquiring pipeline parameters of the drainage pipeline (2);

calculating the second flow by adopting a culvert method based on the pipeline parameters;

or alternatively, the first and second heat exchangers may be,

acquiring water pump parameters of the water pump (31);

and calculating the second flow by adopting a water pump parameter conversion method based on the water pump parameters.

3. The method of claim 1, wherein the flow meter under test comprises at least one of:

Ultrasonic flow meter, doppler flow meter, orifice flow meter, electromagnetic flow meter, turbine flow meter, venturi flow meter, elliptical gear flow meter, turbine flow meter, vortex street flow meter, royal flow meter, dual rotor flow meter, target flow meter, nozzle flow meter, weir and orifice flow meter.

4. The method of claim 1, wherein the performing the error analysis based on the first flow and the corresponding second flow under the different conditions comprises:

respectively calculating error values between the first flow and the second flow at the same moment under the same working condition; the error value includes at least one of the following; absolute error, relative error, mean absolute error, mean square error.

5. The method of claim 1, further comprising, after performing the error analysis:

based on the error analysis results, a graph is generated, the graph including at least one of: a scatter plot, a linear regression plot, a Bland Altman plot, a histogram, a box plot, the plot being used to characterize the error distribution between the first flow and the second flow and the trend of the change over time.

6. The method of claim 5, after determining the verification result of the flowmeter under test, comprising:

generating an analysis report, the analysis report comprising: and under different working conditions and at different moments, the difference between the first flow and the second flow and a predicted result predicted based on the change trend.

7. A flow meter verification test platform adapted for use in the method of any one of claims 1 to 6, said platform comprising:

the inspection wells (1) are arranged side by side, the inspection wells (1) are respectively communicated through drainage pipelines (2), a flowmeter to be measured is arranged on the drainage pipelines (2), the flowmeter to be measured is connected with the drainage pipelines (2) through flanges (12), and the drainage pipelines (2) form a preset included angle with the horizontal plane, so that liquid flows out of the inspection wells (1) positioned at the most upstream;

the water collecting tank (3) comprises a water pump (31), an electric valve (32) and a standard flowmeter (33), the water collecting tank (3) is used for collecting liquid flowing out of the water draining pipeline (2), the electric valve (32) and the standard flowmeter (33) are sequentially arranged at the outlet of the water pump (31), the electric valve (32) is used for controlling the flowing-out liquid flow, and the standard flowmeter (33) is used for metering the flow flowing into the most upstream inspection well (1);

A water return pipeline (4), wherein the inspection well (1) is also communicated through the water return pipeline (4), and the water return pipeline (4) is used for recycling water in the water collecting tank (3) to the most upstream inspection well (1) through the water pump (31);

a water blocking weir plate (5) arranged at the inner part or the water outlet of the inspection well (1) at the most downstream for adjusting the fluid level in the drainage pipeline (2);

a plurality of metering devices (11), wherein the metering devices (11) comprise liquid level meters and/or silt meters which are respectively arranged at the top of each inspection well (1) and are used for monitoring the liquid level and/or the silt concentration of the corresponding inspection well (1); the metering device (11) is also arranged at two sides of the water blocking weir plate (5) and is used for respectively monitoring the liquid level and/or the sludge concentration at two sides of the water blocking weir plate (5).

8. The platform of claim 7, further comprising:

a liquid level scale (14) which is respectively arranged in each inspection well (1) and is used for measuring the liquid level of the inspection well (1); the liquid level gauge (14) is also arranged at two sides of the water blocking weir plate (5) and is used for respectively measuring the liquid levels at two sides of the water blocking weir plate (5);

and the image acquisition equipment (13) is used for shooting a picture of the liquid level scale (14) and processing the picture to obtain a liquid level scale value.

9. The platform of claim 7, wherein the flow meter to be measured is a non-contact flow meter, the platform further comprising:

the rotating device (6) comprises a rotatable support (61), a flowmeter fixing table (62) and an angle sensor, wherein the rotating device (6) is arranged at a water inlet of a drainage pipeline (2) of the inspection well (1), the flowmeter fixing table (62) is used for installing the non-contact flowmeter, the rotatable support (61) is used for driving the flowmeter fixing table (62) to rotate, and the angle sensor is used for detecting the angle between the non-contact flowmeter and the bottom of the drainage pipeline (2).

10. A flow meter verification device, the device comprising:

the collection module is used for collecting first flow of the flowmeter to be measured under different working conditions and different moments of the drainage pipeline (2), and the working conditions comprise: fluid flow, fluid level, fluid flow rate; wherein the fluid flow rate and the fluid flow velocity are regulated by an electric valve (32) connected with a water pump (31), and the fluid liquid level is regulated by the height of a water blocking weir plate (5); the water retaining weir plate (5) is arranged at the water outlet of the drainage pipeline (2);

The determining module is used for determining a second flow corresponding to the first flow through a preset method, wherein the second flow is a standard flow under different working conditions and different moments of the drainage pipeline (2):

and the checking module is used for carrying out error analysis on the basis of the first flow and the corresponding second flow under different working conditions and determining a checking result of the flowmeter to be tested.

11. A computer device, comprising:

a memory and a processor, the memory and the processor being communicatively coupled to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the flow meter verification method of any of claims 1-6.