A method and system for flow measurement and verification for fluid delivery piping systems

Abstract

The application relates to the technical field of flow measurement, in particular to a flow measurement and calibration method and system for a fluid conveying pipeline system. First, a flow measurement device is started and a switching valve is controlled, so that a fluid to be measured enters a standard volume cavity; when the fluid passes through a water inlet pipe indicating switch, a system obtains a timing start signal and starts timing; when the fluid fills the container and touches the water inlet pipe indicating switch, the system obtains a timing termination signal; an actual flow value is calculated according to a volume value and a filling time; the drift problem of a traditional flow meter is avoided, and the system can be used as a calibration device of the flow meter; meanwhile, the system records an initial emptying time during calibration as a reference value, compares an actual emptying time after each measurement, and calculates an emptying deviation value; when the deviation exceeds a preset threshold value, a recalibration prompt is automatically triggered, so that potential problems are found in time, the measurement accuracy is ensured, and the preventive maintenance scheme effectively reduces equipment maintenance cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flow measurement, in particular to a flow measurement and calibration method and system for fluid conveying pipeline system. BACKGROUND

[0002] In the field of sewage treatment, the accuracy of flow measurement is crucial for process control and environmental compliance. Accurate flow measurement data is the basis for the normal operation of sewage treatment systems, affecting not only the treatment efficiency and operating cost, but also directly related to the discharge standard and environmental assessment of sewage treatment plants.

[0003] Currently, electromagnetic flowmeters are mainly used for flow measurement in the field of sewage treatment. Its principle is to use Faraday's law of electromagnetic induction to measure the induced electromotive force generated by the flow of conductive liquid in a magnetic field to determine the flow. In addition, ultrasonic flowmeters are also used to measure the time difference of ultrasonic wave propagation in the fluid to calculate the flow rate.

[0004] However, electromagnetic flowmeters are easily affected by impurities and electrode corrosion in sewage, and need frequent maintenance. Ultrasonic flowmeters are greatly affected by pipe material and fluid gas content, and have significant errors at low flow rates. Both methods lack effective online calibration mechanisms and cannot detect performance degradation in a timely manner. Further improvements are needed for this situation. SUMMARY

[0005] To solve the problem of existing flow measurement methods being easily affected by scaling and corrosion and unstable measurement accuracy, the present application provides a flow measurement and calibration method and system for fluid conveying pipeline system, which adopts the following technical solution:

[0006] In a first aspect, the present application provides a flow measurement and calibration method for fluid conveying pipeline system, comprising the following steps:

[0007] Start the flow measurement device, control the switch valve to make the fluid to be measured enter the standard volume cavity, trigger the water flow indication switch of the inlet pipe, and obtain the timing start signal;

[0008] Start timing based on the timing start signal, and trigger the water flow indication switch of the inlet pipe when the fluid to be measured fills the standard volume cavity, and obtain the timing termination signal;

[0009] Calculate the fluid filling time according to the timing start signal and the timing termination signal;

[0010] Determine the actual flow value based on the volume value of the standard volume cavity and the fluid filling time.

[0011] By adopting the technical scheme, since the existing flow meter is susceptible to scaling and corrosion in the field of sewage treatment, for example, the electrode of the electromagnetic flow meter needs to be cleaned frequently, the error of the ultrasonic flow meter is significant at low flow rate, and both lack effective online calibration mechanism, resulting in difficulty in guaranteeing the measurement accuracy; the flow measurement device is first started and the switching valve is controlled to make the fluid to be measured enter the standard volume cavity; when the fluid passes through the water inlet pipe indicating switch, the system obtains a timing start signal and starts timing; when the fluid fills the container and triggers the water inlet pipe indicating switch, the system obtains a timing termination signal; the actual flow value is calculated according to the volume value and the filling time; the standard volume cavity is used as a reference, the filling time of the fixed volume is accurately measured to determine the flow, and the drift problem of the traditional flow meter is avoided; the water flow indicating switch is used to realize automatic timing, and the measurement accuracy and repeatability are improved; the measurement process is fully automated, and the operation is simple and reliable; meanwhile, the flow meter can be used as a calibration device to discover measurement errors in time and make corrections, thereby ensuring the long-term accuracy of flow measurement.

[0012] Optionally, the standard volume cavity is provided with a vent pipe, and the method further comprises the following steps:

[0013] When calibrating the standard volume cavity, the initial venting time of the vent pipe is obtained by venting the fluid to be measured;

[0014] The actual venting time of the vent pipe is obtained by venting the fluid to be measured after each measurement;

[0015] The venting deviation value is calculated according to the initial venting time and the actual venting time;

[0016] Based on the venting deviation value, it is determined whether to trigger a standard volume cavity recalibration prompt.

[0017] By adopting the technical scheme, since the traditional standard volume cavity lacks effective scaling monitoring mechanism, problems can only be found by regular manual inspection or after the measurement result deviates significantly, and the passive maintenance method is inefficient; the initial venting time of the vent pipe required for venting the fluid to be measured is recorded as a reference value when calibrating the volume cavity; after each subsequent measurement is completed, the system will vent the fluid to be measured in the cavity through the vent pipe and record the actual venting time; the venting deviation value is calculated by comparing the actual venting time with the initial venting time; when the venting deviation value exceeds a preset threshold, the system will automatically trigger a recalibration prompt; potential problems can be found in advance, the maintenance cost is effectively reduced, and the long-term stability of the measurement accuracy is ensured.

[0018] Optionally, a flow guide groove is arranged in the standard volume cavity.

[0019] By adopting the technical scheme, since the traditional standard volume cavity adopts a direct injection mode, fluid impact force is large and turbulence is serious, which not only easily causes measurement error, but also exacerbates the erosion and scaling of the inner wall of the cavity; for example, when the standard volume cavity of a certain sewage treatment plant measures high flow, since water flow directly impacts the bottom of the cavity, a large amount of bubbles and vortexes are generated, which causes inaccurate water level detection and affects the reliability of the measurement result; the flow guide groove is arranged in the standard volume cavity; when fluid enters the cavity, it is first received by the flow guide groove and then slowly falls along the spiral flow channel to form a stable laminar flow state; not only the impact force of the fluid is reduced, but also the fluid can uniformly adhere to the inner wall of the cavity and flow, avoiding the generation of bubbles and vortexes.

[0020] Optionally, the vent pipe is connected with a break siphon pipe, and the method further comprises the following steps:

[0021] An outlet pipe water flow indication switch signal receiving node is acquired, and a vent signal is synchronously sent out;

[0022] In response to the vent start signal, the to-be-measured fluid is discharged through the vent pipe, and the communication state between the break siphon pipe and the inlet pipe is switched, so that the residual water in the inlet pipe water flow indication switch pipe section is discharged.

[0023] By adopting the technical scheme, since the traditional gravity natural venting mode cannot completely discharge the residual water in the inlet pipe water flow indication switch pipe section, the residual water will affect the triggering time and timing accuracy of the next measurement; the application solves the above problems by arranging the break siphon pipe on the vent pipe and using the break siphon principle; after the system detects the vent start signal sent out by the outlet pipe water flow indication switch, the to-be-measured fluid in the standard volume cavity is first discharged through the vent pipe, and the system controls the communication state between the break siphon pipe and the inlet pipe to be switched; at this time, the break siphon pipe will produce a negative pressure effect, completely sucking out and discharging the residual water in the inlet pipe water flow indication switch pipe section, so that there is no residual water in the pipe section; the problem of residual water affecting the measurement accuracy in the traditional gravity venting mode is solved, the consistency of the starting conditions of each measurement is ensured, and the reliability of the flow measurement result is improved.

[0024] Optionally, the method further comprises the following steps:

[0025] The actual venting time is stored to form venting duration historical data;

[0026] According to the venting duration historical data, a venting duration change trend is calculated;

[0027] When the venting duration change trend is a downward trend and exceeds a preset lower limit, a standard volume cavity scaling early warning is triggered;

[0028] When the venting deviation value shows an upward trend and exceeds the preset upper limit, the flow measurement device triggers its own error warning.

[0029] Warning information is generated based on the scaling warning and the error warning.

[0030] By adopting the above technical solution, traditional flow measurement systems, lacking a systematic performance degradation early warning mechanism, often only discover problems after significant deviations in measurement results occur. This not only affects measurement accuracy but may also lead to erroneous process control decisions. This application records and stores the actual venting time after each measurement, establishing a historical venting duration database. Based on this historical data, the system continuously calculates the changing trend of venting duration. When the venting duration trend is found to be decreasing and exceeds a preset lower limit, a standard volumetric cavity scaling warning is triggered. Simultaneously, the system also monitors the venting deviation value, and when it shows an increasing trend and exceeds a preset upper limit, a flow measurement device self-error warning is triggered. Finally, the system generates warning prompts based on these two types of warning information, promptly notifying maintenance personnel. By monitoring the changing trends of venting duration and measurement deviation in real time, early warning of system performance degradation is achieved, transforming maintenance work from passive response to proactive prevention, effectively improving system reliability and maintenance efficiency.

[0031] Optionally, the method may also include the following steps:

[0032] Record the average flow rate value obtained from each measurement;

[0033] The average flow rate values ​​are stored in chronological order to form historical flow rate data;

[0034] Generate a traffic change trend curve based on the historical traffic data;

[0035] A measurement report is generated based on the historical traffic data.

[0036] By adopting the above technical solution, the system records the average flow rate value obtained from each measurement. These average flow rate values ​​are calculated based on the standard volumetric cavity volume and filling time. Subsequently, these measurement data are stored in chronological order to form a historical flow rate database for system operation. Based on the accumulated historical data, the system automatically generates flow rate change trend curves, intuitively displaying the long-term variation pattern of flow rate. At the same time, the system also automatically generates measurement reports based on historical flow rate data, facilitating data analysis and decision-making by management personnel.

[0037] Secondly, this application provides a flow measurement and verification system for a fluid transport pipeline system, comprising:

[0038] A standard volumetric cavity is used to contain the fluid to be measured;

[0039] a switching valve for controlling the flow of the fluid to be measured into the standard volume chamber;

[0040] a water inlet pipe flow indicating switch arranged on the water inlet pipe for detecting the flow of the fluid to be measured and triggering a timing start signal;

[0041] a water outlet pipe flow indicating switch arranged on the water outlet pipe for detecting the fullness of the fluid to be measured and triggering a timing end signal;

[0042] a controller connected to the switching valve, the water inlet pipe flow indicating switch and the water outlet pipe flow indicating switch, the controller being configured to perform the following steps:

[0043] controlling the switching valve to allow the fluid to be measured to enter the standard volume chamber;

[0044] calculating a fluid fullness time based on the timing start signal and the timing end signal;

[0045] calculating an actual flow value based on the volume value of the standard volume chamber and the fluid fullness time.

[0046] Optionally, the system further comprises:

[0047] a vent pipe arranged on the standard volume chamber for emptying the fluid to be measured;

[0048] a vent pipe flow indicating switch arranged on the vent pipe for detecting the emptying state of the fluid to be measured;

[0049] the controller is further configured to perform the following steps:

[0050] acquiring an initial emptying time of the vent pipe for emptying the fluid to be measured when calibrating the standard volume chamber;

[0051] acquiring an actual emptying time of the vent pipe for emptying the fluid to be measured after each measurement;

[0052] calculating an emptying deviation value based on the initial emptying time and the actual emptying time;

[0053] judging whether to trigger a standard volume chamber recalibration prompt based on the emptying deviation value.

[0054] In a third aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for flow measurement and calibration of a fluid conveying pipeline system.

[0055] In a fourth aspect, the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the flow measurement and calibration method for a fluid conveying pipeline system.

[0056] In summary, the present application includes at least one of the following beneficial technical effects:

[0057] 1. The present application first starts the flow measurement device and controls the switching valve to make the fluid to be measured enter the standard volume cavity; when the fluid passes through the water inlet pipe indicating switch, the system obtains a timing start signal and starts timing; when the fluid fills the container and triggers the water inlet pipe indicating switch, the system obtains a timing end signal; the actual flow value is calculated according to the volume value and the filling time; the standard volume cavity is used as a reference to determine the flow by accurately measuring the filling time of a fixed volume, avoiding the drift problem existing in traditional flow meters; the water flow indicating switch is used to realize automatic timing, improving the measurement accuracy and repeatability; the measurement process is fully automated, simple and reliable to operate; at the same time, it can be used as a calibration device for flow meters to timely find measurement errors and make corrections, ensuring the long-term accuracy of flow measurement;

[0058] 2. The present application first records the initial emptying time required for the emptying pipe to empty the fluid to be measured in the calibration volume cavity as a reference value; after each subsequent measurement is completed, the system will empty the fluid to be measured in the cavity through the emptying pipe and record the actual emptying time; by comparing the actual emptying time with the initial emptying time, the emptying deviation value is calculated; when the emptying deviation value exceeds the preset threshold value, the system will automatically trigger a re-calibration prompt; potential problems can be found in advance, effectively reducing maintenance costs and ensuring the long-term stability of measurement accuracy;

[0059] 3. The present application solves the above problem by setting a break siphon on the emptying pipe and using the break siphon principle; when the system detects the emptying start signal sent by the water outlet pipe water flow indicating switch, it first empties the fluid to be measured in the standard volume cavity through the emptying pipe, and controls the system to switch the communication state between the break siphon and the water inlet pipe; at this time, the break siphon will produce a negative pressure effect to completely suck out and empty the water in the water inlet pipe water flow indicating switch pipe section, ensuring that there is no residual water in the pipe section; solving the problem of residual water affecting measurement accuracy in the traditional gravity emptying mode, ensuring the consistency of the starting conditions of each measurement, and improving the reliability of the flow measurement results. BRIEF DESCRIPTION OF DRAWINGS

[0060] Figure 1 is a flowchart of a flow measurement and calibration method for a fluid conveying pipeline system according to an embodiment of the present application;

[0061] Figure 2 is a structural schematic diagram of a flow measurement device in an embodiment of the present application;

[0062] Figure 3 is a flowchart of the process of recalibrating the standard volume cavity based on the emptying deviation value in the embodiments of the present application;

[0063] Figure 4 is a flowchart of the process of emptying the water storage through the broken siphon pipe in the embodiments of the present application;

[0064] Figure 5 is a flowchart of the process of generating a measurement report in the embodiments of the present application;

[0065] Figure 6 is a flowchart of the process of generating a pre-warning prompt in the embodiments of the present application;

[0066] Figure 7 is a schematic diagram of a module of a flow measurement and verification system for a fluid delivery pipeline system in the embodiments of the present application;

[0067] Figure 8 is an internal structure diagram of an electronic device in the embodiments of the present application. DETAILED DESCRIPTION

[0068] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and the appended claims of the present application, the singular forms "a," "an" and "the" are intended to include both singular and plural forms, unless the context clearly indicates otherwise. It will be further understood that the terms "and / or" as used herein refers to any or all possible combinations of one or more of the associated listed items.

[0069] Hereinafter, the terms "first" and "second" are only for the purpose of description and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0070] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0071] In a first aspect, the present application provides a flow measurement and verification method for a fluid delivery pipeline system, referring to Figure 1 , comprising the following steps:

[0072] S110, start the flow measurement device, control the switch valve to make the fluid to be measured enter the standard volume cavity, trigger the water flow indication switch of the inlet pipe, and obtain a timing start signal.

[0073] In this embodiment, as shown in Figure 2 The flow measuring device includes a standard volume cavity, an inlet pipe, an outlet pipe, and corresponding water flow indication switches, etc. A switching valve is installed on the inlet pipe to control whether the fluid to be measured enters the standard volume cavity. An inlet pipe water flow indication switch is installed near the inlet of the standard volume cavity to detect the flow state of the fluid.

[0074] Specifically, at the beginning of measurement, the controller sends an opening signal to the switching valve to guide the fluid to be measured from the inlet pipe into the standard volume cavity. When the fluid passes through the inlet pipe water flow indication switch, the switch senses the fluid flow and generates an electrical signal, which is used as the timing starting point by the system.

[0075] S120, start timing based on the timing starting signal, and when the fluid to be measured fills the standard volume cavity, trigger the outlet pipe water flow indication switch to obtain the timing termination signal.

[0076] In this embodiment, the top of the standard volume cavity is provided with an outlet pipe water flow indication switch to detect whether the container is full.

[0077] Specifically, after the fluid to be measured enters the standard volume cavity through the inlet main pipe, it fills upward along the internal structure. When the liquid level rises to the top, the excess fluid will overflow from the outlet branch pipe, triggering the outlet pipe water flow indication switch. At this time, the system confirms that the standard volume cavity has been filled to the standard volume, and generates a timing termination signal. During the entire filling process, the internal structure is designed to ensure smooth rising of the fluid and avoid the generation of bubbles or turbulent phenomena.

[0078] S130, calculate the fluid filling time according to the timing starting signal and the timing termination signal.

[0079] In this embodiment, the fluid filling time refers to the time interval from the triggering of the inlet pipe water flow indication switch to the triggering of the outlet pipe water flow indication switch.

[0080] Specifically, the controller uses a timer to record the triggering time of the two water flow indication switches. The fluid filling time T is equal to the outlet switch triggering time stamp minus the inlet switch triggering time stamp, and the unit is converted to minutes.

[0081] S140, determine the actual flow value based on the volume value of the standard volume cavity and the fluid filling time.

[0082] In this embodiment, as shown in Figure 2 The standard volume cavity has a standard volume value V marked by a scale line. The actual flow value Q refers to the volume of fluid passing through the pipe per unit time.

[0083] Specifically, the system divides the standard volume value V (unit: cubic meters) by the filling time T (unit: minutes) measured in step S130 to obtain the actual flow value Q = V / T (unit: cubic meters / minute). Considering the temperature change in actual application, the system installs a temperature sensor on the volume cavity, and when the temperature deviates from the calibration temperature by more than ±5℃, a temperature correction coefficient K is obtained by looking up a table for correction. The corrected actual flow value Q' = Q x K.

[0084] Further, the system compares the actual flow value with the flow meter measurement value in the pipeline system to calculate the deviation rate.

[0085] In this embodiment, the flow meter installed on the detected pipeline is connected to the standard volume cavity through the calibration inlet pipe. The deviation rate is used to evaluate the accuracy of the flow meter, and the system sets the allowed deviation range to ±5%.

[0086] Specifically, the system reads the cumulative flow value of the detected flow meter in the measurement period in real time to calculate the average flow value Qm. The average flow value Qm of the flow meter is compared with the actual flow value Q' measured by the standard volume method to calculate the deviation rate E: E = (Qm - Q') / Q' x 100%. If the absolute value of the deviation rate is greater than the allowed deviation range, the system will mark the measurement result in the database and prompt the operator through the industrial computer interface. After each measurement is completed, the system empties the fluid to be measured through the vent pipe to prepare for the next measurement.

[0087] During each measurement process, the system simultaneously collects the real-time flow value of the flow meter, the temperature and pressure data of the inlet and outlet pipes, the fluid pulsation characteristics, and the mechanical state parameters. Among them, the fluid pulsation characteristics are obtained by collecting the pressure fluctuation signal through the pressure sensor on the inlet pipe, and the pressure fluctuation will be abnormal when the flow meter is installed inappropriately (such as insufficient straight pipe length); the mechanical state parameters include bearing vibration frequency and driving circuit current value, which are obtained through the vibration sensor and current detection circuit installed on the flow meter shell. At the same time, the system is also configured with an online densimeter and conductivity sensor for monitoring the change of sewage quality. Through the pre-established characteristic rule library, the fault type is automatically identified: when the deviation rate at different range points differs by more than 3% and the pressure fluctuation amplitude is greater than 2 times the preset normal value, it is determined as an installation problem; when the recent deviation rate continuously increases and the growth rate exceeds 0.5% / month, and the bearing vibration amplitude exceeds 2 times the rated value, it is determined as a flow meter aging problem; when the deviation rate fluctuates by more than 5% in a short time and the density or conductivity suddenly changes beyond the preset range (such as sudden change of suspended solids content in sewage or intermittent discharge of industrial wastewater), it is determined as a medium abnormality problem.

[0088] When the system identifies the fault type, the fault type and the recommended treatment scheme will be displayed on the industrial computer interface. The staff can choose to handle it immediately or start temporary correction measures according to the on-site situation. If the temporary correction measures are selected, the staff needs to confirm and set the effective period of the correction measures on the industrial computer interface. For installation problems, the system respectively measures at 0.1 times, 0.3 times, 0.5 times, 0.8 times and 1.0 times of the five range points, calculates the average deviation value of each range point to generate a calibration curve, and then divides the entire range into five segments with 0.2 times of the range as the segmentation unit. In each segment, the correction coefficient in the interval is calculated by linear interpolation according to the deviation values of the adjacent two calibration points. Finally, the correction coefficient is stored in the lookup table for real-time correction. For the aging problem of the flowmeter, the system regularly measures at 0.5 times of the range point every month, records the deviation value and vibration amplitude at this point, and predicts the deviation value of the next month by linear extrapolation according to the deviation change rate of the past three months. When the predicted deviation value exceeds the allowed range, calibration is arranged in advance. For the measurement deviation caused by the fluctuation of the water quality (such as the change of suspended solids content in sewage, the intermittent discharge of industrial wastewater, etc. causing sudden changes in medium density and conductivity), the system monitors the water quality parameters in real time through the online density meter and conductivity sensor. When it is detected that the water quality parameters exceed the calibration working condition range, dynamic correction is performed according to the pre-established water quality parameter-correction coefficient correspondence table. The system stores all the correction data according to the measurement number, date, type and other information, and sets a validity period of three months. After the validity period is exceeded, it prompts to re-calibrate and confirm.

[0089] In one embodiment, the standard volume cavity is provided with a venting pipe, with reference to Figure 3 , the method further comprises the following steps:

[0090] S310, when calibrating the standard volume cavity, the initial venting time is obtained by venting the fluid to be measured through the venting pipe.

[0091] In this embodiment, the venting pipe refers to the liquid discharge pipeline installed at the bottom of the standard volume cavity, including a venting valve and a venting pipeline. The initial venting time refers to the reference time required to completely vent the fluid in the container under the condition of clean and no fouling. The calibration process needs to be carried out in a constant temperature environment to eliminate the influence of temperature on the viscosity of the fluid.

[0092] Specifically, standard water samples at 20°C are injected into the container until the water flow indication switch generates a signal. The system controls the venting valve to fully open according to the preset opening degree, and starts the timer at the same time. During the venting process, the bottom liquid level sensor monitors the liquid level change in real time. When the liquid has been vented in the device, the latest signal-free time point appears in the venting pipe water flow indication switch and lasts for 10 seconds without new signal, and the system records the latest signal-free time point as the venting termination time point.

[0093] S320, emptying the fluid to be measured through the vent pipe after each measurement to obtain the actual venting time.

[0094] In this embodiment, the actual venting time refers to the actual time required to empty the fluid to be measured in the standard volume cavity after the daily measurement work is completed. The system uses the same venting process parameters as during calibration, including the same valve opening and liquid level detection method, to ensure the comparability of the measurement.

[0095] Specifically, after each flow measurement is completed, the system automatically executes the venting program. First, it detects whether the liquid level in the container is at the standard scale line position, and if it is below that position, it records the actual liquid level value for subsequent correction. The system controls the vent valve to open, and the bottom liquid level sensor starts recording the venting process.

[0096] S330, calculating the venting deviation value based on the initial venting time and the actual venting time.

[0097] In this embodiment, the venting deviation value refers to the difference between the actual venting time and the initial venting time, which is used to represent the scaling or pipe blockage condition in the standard volume cavity.

[0098] Specifically, the system uses a mathematical model to calculate the venting deviation value. First, it corrects the actual venting time for temperature to obtain the corrected venting time Tr under standard conditions. Then it calculates the relative deviation according to the formula: Venting deviation value D = (Tr - T0) / T0 x 100%. The system maintains a sliding time window database of venting deviation values, and identifies abnormal trends through statistical analysis.

[0099] Further, the system provides a fluid property parameter configuration interface for setting and managing correction parameters for different fluids. In terms of fluid basic information configuration, the system establishes a fluid information database to record fluid name, type (such as water, oil, chemical liquid, etc.), reference viscosity value under standard conditions, and density range and use temperature range. For the establishment of temperature-viscosity relationship curve, the system uses linear fitting method to measure viscosity value at different temperature points, and obtains temperature-viscosity relationship curve through linear fitting. The venting time correction uses the formula: Tr = Tm x (μm / μ0), where Tr is the corrected venting time, Tm is the measured venting time, μm is the viscosity at the measurement temperature, and μ0 is the viscosity at the standard temperature. The system regularly (every quarter) verifies the accuracy of the correction coefficient using standard fluid, records the actual temperature and corresponding correction effect of each measurement, and when the corrected venting deviation value deviates systematically, prompts the administrator to recalibrate the correction parameters, thereby ensuring the accuracy of the fluid temperature correction.

[0100] S340, determining whether to trigger a standard volume cavity recalibration prompt based on the venting deviation value.

[0101] In this embodiment, the standard volume cavity recalibration prompt refers to a prompt information that the system determines whether the container needs to be cleaned or recalibrated according to the emptying deviation value analysis result.

[0102] Specifically, the system determines whether to trigger the recalibration prompt through the decision table. When the emptying deviation value is 0-5%, the system only records data and does not trigger a prompt; when the deviation value reaches 5-15%, the system issues a mild early warning and suggests cleaning during the next planned maintenance; when the deviation value exceeds 15%, the system triggers a recalibration prompt, requiring immediate container inspection and cleaning.

[0103] In one embodiment, referring to Figure 2 , a guide groove is arranged in the standard volume cavity, the guide groove is arranged obliquely, and the guide groove is provided with a flow channel extending downward along the inner wall of the cavity in a spiral manner. When the fluid enters the cavity, it is first received by the guide groove and then slowly falls along the spiral flow channel to form a stable laminar flow state; not only does this reduce the impact force of the fluid, but also enables the fluid to flow uniformly along the inner wall of the cavity, thereby avoiding the generation of bubbles and vortexes.

[0104] In one embodiment, referring to Figure 4 , the emptying pipe is connected with a break siphon pipe, and the method further includes the following steps:

[0105] S410, acquiring a water outlet pipe water flow indication switch signal opening node, and synchronously starting an emptying signal.

[0106] In this embodiment, the emptying signal refers to a trigger signal sent by the water outlet pipe water flow indication switch when the system needs to prepare for emptying for the next measurement after the standard volume cavity completes a flow measurement.

[0107] S420, in response to the emptying start signal, emptying the fluid to be measured through the emptying pipe, and simultaneously switching the communication state of the break siphon pipe and the water inlet pipe to empty the stored water in the water inlet pipe water flow indication switch pipe section.

[0108] In this embodiment, the break siphon pipe is a special pipe structure that works on the principle of siphon, which forms a negative pressure area at a high place to automatically empty the accumulated water at a low place.

[0109] Specifically, the system establishes an emptying control timing table, which specifies the action sequence and time interval of each execution mechanism during the emptying process. After receiving the emptying start signal, the system first opens the emptying pipe valve and uses gravity to discharge the fluid to be measured in the volume cavity; the control switch valve is turned to the break siphon pipe position to establish the communication relationship between the break siphon pipe and the water inlet pipe. The stored water in the pipe section is removed through the break siphon pipe.

[0110] In one embodiment, referring to Figure 5 , the method further includes the following steps:

[0111] S510, record the average flow value obtained in each measurement.

[0112] In this embodiment, the average flow value refers to the fluid flow value calculated by the measured time parameter during a single measurement, reflecting the average flow rate of the fluid within the measurement period.

[0113] Specifically, the system establishes a flow calculation parameter table, and after each measurement, the measured time value is substituted into the preset flow calculation formula to obtain the average flow value.

[0114] S520, store the average flow value in chronological order to form historical flow data.

[0115] In this embodiment, the historical flow data refers to all measurement results recorded by the system in chronological order.

[0116] S530, generate a flow change trend curve based on the historical flow data.

[0117] In this embodiment, the flow change trend curve is a data visualization form, with the horizontal axis representing time and the vertical axis representing flow value, and the curve intuitively displays the change law of flow over time.

[0118] S540, generate a measurement report based on the historical flow data.

[0119] In this embodiment, the measurement report is a statistical analysis result of the historical flow data, including statistical indicators such as daily average flow, weekly average flow, and monthly average flow, as well as information such as flow fluctuation range and abnormal point statistics.

[0120] In one embodiment, referring to Figure 6 , the method further comprises the following steps:

[0121] S610, store the actual emptying time to form emptying duration historical data.

[0122] In this embodiment, the actual emptying time refers to the duration from the start of emptying to the end of emptying, including the actual liquid discharge time and the dripping time of residual liquid in the pipeline. The historical data is stored in time series form, containing associated information such as emptying date, ambient temperature, and liquid type.

[0123] S620, calculate the emptying duration change trend based on the emptying duration historical data.

[0124] In this embodiment, the emptying duration change trend reflects the change of device performance over time. The system compares the emptying duration under the same conditions to analyze its growth rate and pattern.

[0125] S630, triggering a standard volume cavity fouling early warning when the emptying duration change trend presents a downward trend and exceeds a preset lower limit.

[0126] In this embodiment, the emptying duration refers to the duration from the start of emptying to the completion of emptying. The preset lower limit is based on the statistical value of the emptying duration when the device is normally running.

[0127] S640, triggering a flow measurement device self-error early warning when the emptying deviation value presents an upward trend and exceeds a preset upper limit.

[0128] In this embodiment, the emptying deviation value refers to the difference between the actual emptying time and the initial emptying time. The preset upper limit is a preset maximum allowable lower limit of the difference.

[0129] S650, generating early warning prompt information based on the fouling early warning and the error early warning.

[0130] In this embodiment, the early warning prompt information includes early warning type, early warning level, triggering condition, suggested measures, and the like. The system uses different prompt methods according to the emergency degree of the early warning to ensure that the information is timely and effectively delivered.

[0131] Specifically, the system designs a hierarchical early warning information pushing mechanism. For general early warning, the system displays prompt information on the industrial computer interface; for emergency early warning, the system simultaneously sends an audible and visual alarm and a mobile phone message notification.

[0132] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0133] In a second aspect, the present application provides a flow measurement and calibration system for a fluid conveying pipeline system. The flow measurement and calibration system for a fluid conveying pipeline system of the present application is described below in conjunction with the above flow measurement and calibration method for a fluid conveying pipeline system.

[0134] Reference Figure 7 A flow measurement and calibration system for a fluid conveying pipeline system, comprising:

[0135] A standard volume cavity for containing the fluid to be measured;

[0136] A switching valve for controlling the fluid to be measured into the standard volume cavity;

[0137] A water inlet pipe flow indication switch arranged on the water inlet pipe for detecting the fluid to be measured and triggering a timing start signal;

[0138] The outflow pipe water flow indication switch is arranged on the outflow pipe and is used for detecting that the to-be-tested fluid is full and triggering a timing termination signal.

[0139] The controller is connected with the switching valve, the inflow pipe water flow indication switch and the outflow pipe water flow indication switch, and is used for performing the following steps:

[0140] The switching valve is controlled to make the to-be-tested fluid enter the standard volume cavity;

[0141] The fluid fullness time is calculated based on the timing initiation signal and the timing termination signal;

[0142] The actual flow value is calculated according to the volume value of the standard volume cavity and the fluid fullness time;

[0143] The actual flow value is compared with a flow meter measurement value in a pipeline system to obtain a deviation rate.

[0144] In an embodiment, the system further comprises:

[0145] The vent pipe is arranged on the standard volume cavity and is used for emptying the to-be-tested fluid;

[0146] The vent pipe water flow indication switch is arranged on the vent pipe and is used for detecting an emptying state of the to-be-tested fluid;

[0147] The controller is further used for performing the following steps:

[0148] When the standard volume cavity is calibrated, an initial emptying time of the vent pipe for emptying the to-be-tested fluid is obtained;

[0149] An actual emptying time of the vent pipe for emptying the to-be-tested fluid is obtained after each measurement;

[0150] An emptying deviation value is calculated according to the initial emptying time and the actual emptying time;

[0151] Whether to trigger a standard volume cavity recalibration prompt is judged based on the emptying deviation value.

[0152] In an embodiment, the present application provides an electronic device, which can be a server, and an internal structure diagram of the electronic device can be as shown in Figure 8As shown in the figure. The electronic device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium, an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The database of the electronic device is used to store data. The network interface of the electronic device is used to communicate with the external terminal through the network connection. The computer program is executed by the processor to implement a flow measurement and calibration method for a fluid conveying pipeline system.

[0153] Those skilled in the art can understand that, Figure 8 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0154] In one embodiment, an electronic device is also provided, including a memory and a processor, the memory stores a computer program, and the processor executes the computer program to implement the steps in each of the above method embodiments.

[0155] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by a computer program instructing related hardware. The above-mentioned 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 above-mentioned embodiments. Any reference to memory, storage, database or other medium used in each embodiment provided by the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not as a limitation, RAM can be in various forms such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0156] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A method for measuring and verifying the flow rate of a fluid transport pipeline system, characterized in that, Includes the following steps: Start the flow measurement device, control the switching valve to allow the fluid to be measured to enter the standard volume chamber, trigger the water flow indicator switch in the inlet pipe, and obtain the timing start signal; Timing begins based on the timing start signal. When the fluid to be tested fills the standard volume chamber, the water flow indicator switch on the outlet pipe is triggered to obtain the timing stop signal. The fluid filling time is calculated based on the timing start signal and the timing end signal. The actual flow rate is determined based on the volume of the standard cavity and the fluid filling time. The actual flow rate is compared with the flow meter readings in the pipeline system to calculate the deviation rate. During each measurement, the real-time flow rate of the flow meter, the temperature and pressure data of the inlet and outlet water pipes, the fluid pulsation characteristics obtained by the pressure sensor, and the mechanical state parameters including the bearing vibration frequency and the current value of the drive circuit are collected simultaneously. Fault identification is performed using a pre-established feature rule base: when the difference in the deviation rate at different measurement ranges exceeds a first preset threshold and the pressure fluctuation amplitude in the fluid pulsation characteristics is greater than a first multiple of the normal threshold, it is determined to be an installation problem; when the growth rate of the deviation rate exceeds a second preset threshold and the bearing vibration amplitude in the mechanical condition parameters exceeds a second multiple of the rated threshold, it is determined to be a flowmeter aging problem; when the fluctuation of the deviation rate exceeds a third preset threshold and the change in fluid density or conductivity exceeds a third preset range, it is determined to be a medium abnormality problem. For different types of faults, corresponding corrective measures are implemented: For installation problems, calibration measurements are performed at multiple range points to generate calibration curves, and the range is segmented. Within each segment, a correction coefficient is calculated using linear interpolation based on the deviation values ​​of adjacent calibration points; For flow meter aging problems, calibration measurements are performed periodically at preset range points, and future deviation values ​​are predicted based on historical deviation change rates; For media abnormalities, water quality parameters are monitored online, and dynamic corrections are performed based on a pre-established water quality parameter-correction coefficient correspondence table.

2. The method for flow measurement and verification of a fluid transport pipeline system according to claim 1, characterized in that, The standard volumetric cavity is equipped with a vent pipe, and the method further includes the following steps: When calibrating the standard volume chamber, the fluid to be tested is emptied through the vent pipe to obtain the initial venting time; After each measurement, the fluid to be measured is emptied through the vent pipe to obtain the actual venting time. The fluid temperature and viscosity parameters at the time of measurement are obtained, and the actual venting time is corrected for temperature based on the fluid temperature and viscosity parameters. The corrected venting time Tr is obtained by using the formula Tr=Tm×(μm / μ0), where Tm is the measured venting time, μm is the viscosity at the measurement temperature, and μ0 is the viscosity at the standard temperature. The relative deviation between the corrected venting time Tr and the initial venting time is calculated and used as the venting deviation value. Based on the venting deviation value, determine whether to trigger a standard volume cavity recalibration prompt.

3. The method for flow measurement and verification of a fluid transport pipeline system according to claim 2, characterized in that, The standard volumetric cavity is provided with a flow guide groove, which is inclined and has a flow channel that extends spirally downward along the inner wall of the cavity.

4. The method for flow measurement and verification of a fluid transport pipeline system according to claim 2, characterized in that, The vent pipe is connected to a siphon breaking pipe, and the method further includes the following steps: Obtain the water flow indicator switch signal from the outlet pipe to open the node, and simultaneously initiate the venting signal; In response to the venting start signal, the fluid to be tested is vented through the venting pipe, and at the same time the connection status of the siphon breaking pipe and the water inlet pipe is switched to vent the water stored in the water flow indicator switch section of the water inlet pipe.

5. The method for flow measurement and verification of a fluid transport pipeline system according to claim 2, characterized in that, The method also includes the following steps: The actual venting time is stored to form historical venting duration data; Calculate the trend of air release duration based on the historical data of air release duration; When the venting duration shows a downward trend and exceeds a preset lower limit, a standard volumetric cavity scaling warning is triggered. When the venting deviation value shows an upward trend and exceeds the preset upper limit, the flow measurement device triggers its own error warning. Warning information is generated based on the scaling warning and the error warning.

6. The method for flow measurement and verification of a fluid transport pipeline system according to claim 1, characterized in that, The method also includes the following steps: Record the average flow rate value obtained from each measurement; The average flow rate values ​​are stored in chronological order to form historical flow rate data; Generate a traffic change trend curve based on the historical traffic data; A measurement report is generated based on the historical traffic data.

7. A flow rate measurement and verification system for fluid transport pipeline systems, characterized in that, The method for flow measurement and verification of a fluid transport pipeline system according to any one of claims 1-6 includes: A standard volumetric cavity is used to contain the fluid to be measured; A switching valve is used to control the flow of the fluid to be tested into the standard volumetric cavity; The inlet pipe flow indicator switch is installed on the inlet pipe to detect the entry of the fluid to be tested and trigger the timing start signal; The water flow indicator switch on the outlet pipe is used to detect when the fluid to be tested is full and trigger a timing stop signal. The controller, connected to the switching valve, the inlet water pipe flow indicator switch, and the outlet water pipe flow indicator switch, is used to perform the following steps: The switching valve is controlled to allow the fluid to be tested to enter the standard volume chamber; The fluid filling time is calculated based on the timing start signal and the timing stop signal; The actual flow rate is calculated based on the volume of the standard volumetric cavity and the fluid filling time.

8. The flow measurement and verification system for fluid transport pipeline systems according to claim 7, characterized in that, The system also includes: A vent pipe is installed on the standard volume chamber to drain the fluid to be tested; A vent pipe flow indicator switch is installed on the vent pipe to detect the venting status of the fluid to be tested. The controller is also configured to perform the following steps: When calibrating the standard volume chamber, the initial venting time of the venting tube to vent the fluid to be tested is obtained; After each measurement, the actual venting time of the fluid to be measured is obtained from the venting pipe. Calculate the venting deviation value based on the initial venting time and the actual venting time; Based on the venting deviation value, determine whether to trigger a standard volume cavity recalibration prompt.

9. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the steps of flow measurement and verification for a fluid transport pipeline system as described in any one of claims 1-6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it performs the steps of flow measurement and verification for a fluid transport pipeline system as described in any one of claims 1-6.

Images