Precession vortex gas flowmeter

Abstract

The invention provides a precession vortex gas flowmeter, which relates to the technical field of gas flowmeters and comprises a pipeline, a measuring pipe, a sealing ring, a measuring head, a vortex generating component, a rectifying plate, a measuring display and an intelligent flow processing system, wherein the measuring pipe is fixedly connected in the pipeline, the middle section of the measuring pipe is provided with two measuring heads with probes through sealing rings, one end is provided with the vortex generating assembly, and the other end is provided with the rectifying plate; the outer wall of the pipeline is provided with the measuring display and two ends are provided with flange rings; the flow intelligent processing system comprises a signal processing module, a flow calculation module and a data storage module, and further comprises a fault diagnosis module, a man-machine interaction module and a data transmission module. Through the self-adaptive filtering, multi-parameter correction and intelligent operation and maintenance functions of the intelligent flow processing system and in combination with the quick disassembly and assembly structure of the vortex generation assembly, the metering precision and reliability under complex working conditions are improved, the problems that traditional equipment is tedious in maintenance and easy to damage in sealing performance are solved, the operation and maintenance cost is comprehensively reduced, and the metering efficiency is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of gas flowmeters, and in particular to a precession vortex gas flowmeter. Background Art

[0002] In the fields of industrial production and energy metering, accurate measurement of gas flow is a key link in achieving process control, cost accounting, and energy management. Vortex gas flowmeters are widely used due to their simple structure and wide range ratio. Their working principle is to use a vortex generator to generate a vortex in the gas, and to calculate the gas flow by detecting the frequency of the vortex. In most existing vortex gas flowmeters, the vortex generator is fixedly connected to the inner wall of the pipe (such as welding or integral molding). When the blades of the vortex generator are worn or deformed due to erosion by gas impurities, or when the vortex stability decreases due to accumulation of dirt due to long-term use, the pipe needs to be disassembled or even cut for maintenance. This operation is cumbersome and time-consuming, and can easily damage the sealing of the pipe, increase maintenance costs and downtime, and seriously affect production continuity and measurement accuracy.

[0003] At the same time, the signal processing and flow calculation systems of traditional vortex precession gas flowmeters are relatively simple, often using fixed-parameter filtering and single linear models. These systems struggle to cope with noise such as electromagnetic interference and pipeline vibration in complex industrial environments, resulting in low vortex signal extraction accuracy. Furthermore, they are unable to dynamically correct flow values ​​based on gas type, real-time pressure, and temperature, leading to large measurement errors at high turndown ratios. Furthermore, these systems have weak fault diagnosis capabilities and limited data storage and transmission capabilities, making them unable to meet the demands of intelligent operation and maintenance and precise metering.

[0004] Therefore, it is necessary to provide a vortex precession gas flowmeter to solve the above technical problems. Summary of the Invention

[0005] The present invention aims to provide a vortex precession gas flowmeter to solve the problems of existing flowmeters such as poor anti-interference ability, inaccurate measurement, unstable structure, inability to adapt to dynamic changes in gas parameters, and untimely fault diagnosis, so as to achieve high-precision measurement of gas flow, stable operation of equipment, and efficient fault diagnosis and maintenance.

[0006] To solve the above technical problems, the present invention provides a vortex precession gas flowmeter, comprising a pipeline, a measuring tube fixedly provided in the pipeline, a sealing ring provided on a middle clamp of the measuring tube, two measuring heads symmetrically fixedly provided on the sealing ring, probes provided on opposite surfaces of the two measuring heads, one end of the probe extending into the inner wall of the measuring tube, a vortex generating assembly installed at one end of the measuring tube, a rectifier plate fixedly provided at the other end of the measuring tube, a measurement display installed on the outer wall of the pipeline, and flange rings fixedly provided at both ends of the pipeline; The measurement display on the outer wall of the pipeline is internally integrated with a flow intelligent processing system, which includes a signal processing module, a flow calculation module, and a data storage module; The signal processing module is electrically connected to the probe of the measuring head, and is used to receive the vortex vibration signal collected by the probe, filter the signal to remove environmental interference noise, amplify the signal, and convert the amplified analog signal into a digital signal; The flow calculation module is in communication with the signal processing module and is used to convert the digital signal processed by the signal processing module into a corresponding gas flow value based on a preset vortex frequency and gas flow correlation algorithm, and the gas flow correlation algorithm is used to dynamically correct the gas flow value according to the gas type parameter, the real-time pressure parameter and the real-time temperature parameter; The data storage module is respectively connected to the signal processing module and the flow calculation module for recording real-time flow data, historical flow data, equipment operation status parameters and fault information within a preset time period.

[0007] Preferably, the vortex frequency and gas flow correlation algorithm preset in the flow calculation module includes a basic flow calculation formula and a comprehensive correction coefficient. The basic flow calculation formula is constructed based on the linear relationship between the vortex frequency and the flow, and the comprehensive correction coefficient is determined according to the physical characteristic parameters corresponding to the gas type, the ratio of the real-time pressure to the standard pressure, and the ratio of the real-time temperature to the standard temperature.

[0008] As an option, it also includes a fault diagnosis module, a human-computer interaction module, and a data transmission module; The fault diagnosis module is respectively connected to the signal processing module, the measuring head and the flow calculation module for real-time monitoring of the equipment operation status and diagnosis of the fault type; The human-computer interaction module is integrated into the measurement display, and is used to realize information interaction between the user and the device, and is used to display the information stored in the data storage module; The data transmission module is in communication with the flow calculation module and the data storage module to realize external data interaction.

[0009] Preferably, the vortex generating assembly includes a first flaring sleeve, a smaller port of the first flaring sleeve is fixedly connected to the measuring tube, a plurality of dovetail grooves are equidistantly provided on the inner wall of the first flaring sleeve along the axial side, a plug-in ring is sleeved on the inner wall of the first flaring sleeve, a plurality of dovetail blocks corresponding to the dovetail grooves are equidistantly provided on the outer wall of the plug-in ring, and a plurality of spiral blades coaxial with the pipeline are fixedly provided on the inner wall of the plug-in ring.

[0010] Preferably, a mounting tube is fixedly provided at the axis of the spiral blade, and a spiral guide plate is installed on one end face of the measuring tube of the mounting tube. The shape of the spiral guide plate corresponds to the shape of the inner wall of the first flaring sleeve. A second flaring sleeve is fixedly provided at the other end of the measuring tube. The cross-section of the inner wall of the measuring tube is wide-mouthed, and the narrowed end of the wide-mouthed inner wall of the measuring tube is located at the first flaring sleeve.

[0011] Preferably, a swivel is rotatably provided on the outer wall of one end of the first expansion sleeve, an annular baffle located in the dovetail groove is fixedly provided on the inner wall of the swivel, and a plurality of through grooves are provided on the annular baffle in an offset manner with the dovetail groove.

[0012] Preferably, the probe is fixedly provided with a piezoelectric sensor on the inner wall of the measuring tube, the bottom surface of the measuring display is provided with a data line sleeve located in the pipe, and two transmission lines corresponding to the two measuring heads are provided in the data line sleeve.

[0013] Preferably, threaded holes are provided on the opposite sides of the two measuring heads, and the ends of the transmission lines are fixedly connected with external threaded columns, and the transmission lines are screwed and fixed to the threaded holes of the measuring heads through the external threaded columns.

[0014] Preferably, the equipment operating status is monitored in real time and the fault type is diagnosed, specifically: Identify the signal amplitude of the vortex vibration signal output by the probe and the signal-to-noise ratio of the filtered signal; then compare the deviation between the real-time flow output by the flow calculation module and the historical average flow, and record it as the historical actual flow difference; detect the data interaction response time of the communication link between the data storage module, the data transmission module and the main control unit; record the signal amplitude, signal-to-noise ratio, historical actual flow difference, and data interaction response time as diagnostic data; Set a normal range for each parameter in the diagnostic data. If any parameter in the diagnostic data is not within its set normal range, it indicates that the parameter is abnormal, and the number of abnormalities is recorded; identify the number of abnormalities of the parameter within the preset diagnostic time zone; Calculate the statistical indicators of the parameters within the preset diagnostic time zone, including mean, variance, and range; Perform weighted calculation on each indicator and the number of abnormalities in the statistical indicators with their preset weights to obtain the diagnostic value corresponding to the parameter; Set the diagnostic threshold and compare the diagnostic value with the diagnostic threshold. If the diagnostic value is greater than or equal to the diagnostic threshold, it means that the parameter is abnormal and a fault code corresponding to the parameter is generated.

[0015] Compared with related technologies, the vortex precession gas flowmeter provided by the present invention has the following beneficial effects: 1. The present invention provides an intelligent flow processing system that uses an adaptive filtering algorithm for dynamic noise reduction and combines multi-parameter weighted correction of flow values ​​to improve metering accuracy under complex working conditions. Through multi-dimensional fault diagnosis and full-cycle data storage and transmission, intelligent operation and maintenance are achieved, solving the problems of weak anti-interference, large errors, and difficult fault troubleshooting in traditional systems, reducing operation and maintenance costs and ensuring reliable measurement.

[0016] 2. The present invention realizes the rapid disassembly and assembly of the vortex generating assembly through the cooperation of the dovetail groove and the plug ring, and combines the swivel ring and the annular baffle to ensure the installation stability. The spiral blades can be inspected and maintained without disassembling or cutting the pipeline, effectively solving the problems of cumbersome maintenance and easy damage to the sealing of the traditional fixed structure, and significantly improving the maintenance efficiency and the sealing of the pipeline system.

[0017] To sum up, the present invention improves the metering accuracy and reliability under complex working conditions through the adaptive filtering, multi-parameter correction and intelligent operation and maintenance functions of the flow intelligent processing system, combined with the rapid disassembly and assembly structure of the vortex generating component, and solves the problems of cumbersome maintenance and easily damaged sealing of traditional equipment, thereby comprehensively reducing operation and maintenance costs and optimizing metering efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a vortex precession gas flowmeter provided by the present invention; Figure 2 A cross-sectional view of the measuring tube proposed by the present invention; Figure 3 A cross-sectional view of the first expansion sleeve proposed in the present invention; Figure 4 This is a schematic structural diagram of the spiral guide plate proposed in the present invention; Figure 5 This is a schematic diagram of the structure of the measurement display proposed by the present invention; Figure 6 This is a connection diagram of the traffic intelligent processing system provided by the present invention.

[0019] Serial numbers in the figure: 1. Pipe; 2. Measuring tube; 3. Sealing ring; 4. Measuring head; 5. Rectifier plate; 6. Measuring display; 7. Insert ring; 8. Dovetail block; 9. Spiral blade; 10. Spiral guide plate; 11. Rotating ring; 12. Annular baffle. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "group," "class," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0022] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining."

[0023] Please refer to Figures 1-6A vortex gas flowmeter includes a pipe 1, a measuring pipe 2 is fixedly provided in the pipe 1, a sealing ring 3 is provided on the middle clamp of the measuring pipe 2, two measuring heads 4 are symmetrically fixedly provided on the sealing ring 3, and probes are provided on the opposite surfaces of the two measuring heads 4, one end of the probes extends into the inner wall of the measuring pipe 2, a vortex generating assembly is installed at one end of the measuring pipe 2, a rectifier plate 5 is fixedly provided at the other end of the measuring pipe 2, a measuring display 6 is installed on the outer wall of the pipe 1, and flange rings are fixedly provided at both ends of the pipe 1; the measuring display 6 adopts the SLXB vortex flowmeter, which can be adapted to a variety of flow sensors to realize the functions of accurate measurement, display, accumulation calculation and the like of various gas flow parameters; the sealing ring 3 The material is nitrile rubber, and the sealing ring 3 made of nitrile rubber has good oil resistance and sealing, which can effectively prevent gas leakage between the measuring tube 2 and the pipeline 1, and ensure the accuracy of measurement; this section of structure builds the overall framework of the flow meter, and the synergistic effect of various components provides a basis for gas flow measurement. The setting of the sealing ring 3 enhances the sealing performance of the equipment; the vortex generating assembly includes a first flared sleeve, and the smaller port of the first flared sleeve is fixedly connected to the measuring tube 2, and a plurality of dovetail grooves are equidistantly provided on the inner wall of the first flared sleeve along the axial side, and a plug ring 7 is sleeved on the inner wall of the first flared sleeve, and a plurality of dovetail blocks 8 corresponding to the dovetail grooves are equidistantly protruded on the outer wall of the plug ring 7, and the inner wall of the plug ring 7 is fixed There are multiple spiral blades 9 coaxial with the pipe 1; the material of the spiral blade 9 is brass. The brass spiral blade 9 has good wear resistance and good flow-conducting performance, which can stably make the gas generate a rotating airflow, ensure the regularity of the vortex, and improve the measurement accuracy; this structure realizes the detachable installation of the plug ring 7 through the cooperation of the dovetail groove and the dovetail block 8, which is convenient for the maintenance of the vortex generating assembly. The spiral blade 9 is the key component for generating the vortex and provides the necessary conditions for flow measurement; a mounting cylinder is fixedly provided at the axis of the spiral blade 9, and a spiral guide plate 10 is installed on one end face of the mounting cylinder to the measuring tube 2. The shape of the spiral guide plate 10 corresponds to the shape of the inner wall of the first flared sleeve. 2 is fixedly provided with a second flared sleeve at the other end, and the inner wall cross-section of the measuring tube 2 is wide-mouthed, and the narrowed end of the wide-mouthed inner wall of the measuring tube 2 is located at the first flared sleeve; the spiral guide plate 10 is made of polypropylene. The spiral guide plate 10 made of polypropylene is light in texture and has good chemical stability, which can guide the gas to enter the measuring tube 2 more smoothly and enhance the stability of the vortex; the material of the measuring tube 2 is 304 stainless steel, which has good corrosion resistance and strength, can adapt to different gas environments, and extend the service life of the equipment; in this section of the structure, the spiral guide plate 10 further optimizes the gas flow state, and the wide-mouthed inner wall design of the measuring tube 2 enhances the vortex strength and improves the measurement sensitivity.

[0024] In the present invention, a swivel 11 is rotatably provided on the outer wall of one end of the first flared sleeve, and an annular baffle 12 located in the dovetail groove is fixedly provided on the inner wall of the swivel 11, and a plurality of through grooves are provided on the annular baffle 12 which are offset from the dovetail groove; the swivel 11 is made of polytetrafluoroethylene, and the swivel 11 made of polytetrafluoroethylene has a small friction coefficient, flexible rotation, and is easy to operate to achieve the fixing and unlocking of the plug ring 7; the annular baffle 12 is made of Q235 steel, which has high strength and can effectively block the dovetail block 8, ensuring that the plug ring 7 The stability after installation; the structure realizes the rapid fixation and disassembly of the plug ring 7 through the cooperation of the rotating ring 11 and the annular baffle 12, which improves the convenience of maintenance; the probe is fixed with a piezoelectric sensor on the inner wall of the measuring tube 2, and the bottom surface of the measuring display 6 is provided with a data line sleeve located in the pipeline 1, and two transmission lines corresponding to the two measuring heads 4 are provided in the data line sleeve; the piezoelectric sensor can choose PZT-5H piezoelectric ceramic sensor, which has good receiving performance, high stability and sensitivity, and can accurately rotate The vortex vibration signal is converted into an electrical signal; the data line sleeve is made of polyvinyl chloride. The data line sleeve made of polyvinyl chloride has good insulation and certain flexibility, which can protect the transmission line from gas corrosion and mechanical damage, and ensure the stability of signal transmission; in this section of the structure, the piezoelectric sensor converts the vortex vibration signal into an electrical signal, the transmission line is responsible for signal transmission, and provides data support for the measurement display 6 to calculate the flow, and the data line sleeve plays a protective role; threaded holes are provided on the opposite sides of the two measuring heads 4, and the ends of the transmission lines are fixed with external threaded columns, and the transmission lines are screwed and fixed to the threaded holes of the measuring heads 4 through the external threaded columns; the material of the external threaded columns is brass. The external threaded columns made of brass have good electrical conductivity and mechanical strength, and are screwed and fixed to the threaded holes of the measuring heads 4. The connection is firm, which can effectively prevent the transmission line from loosening due to vibration and other reasons, and ensure the reliability of signal transmission; the structure realizes a stable connection between the transmission line and the measuring head 4 through threaded connection, reduces interference during signal transmission, and improves the stability of measurement.

[0025] The measurement display 6 on the outer wall of the pipeline 1 is internally integrated with a flow intelligent processing system, which includes a signal processing module, a flow calculation module, and a data storage module; wherein the signal processing module is electrically connected to the probe of the measuring head 4 through a line, the flow calculation module is communicatively connected to the signal processing module, and the data storage module is communicatively connected to the signal processing module and the flow calculation module respectively; The signal processing module is electrically connected to the probe of the measuring head 4 and is used to receive the vortex vibration signal collected by the probe, filter the signal to remove environmental interference noise, amplify the signal, and convert the amplified analog signal into a digital signal; The flow calculation module is in communication with the signal processing module and is used to convert the digital signal processed by the signal processing module into a corresponding gas flow value based on a preset vortex frequency and gas flow correlation algorithm. The gas flow correlation algorithm is used to dynamically correct the gas flow value according to the gas type parameter, the real-time pressure parameter, and the real-time temperature parameter. The data storage module is communicated with the signal processing module and the flow calculation module respectively, and is used to record real-time flow data, historical flow data, equipment operating status parameters and fault information within a preset time period.

[0026] It should be noted that the historical flow data is formed by sampling and storing the real-time flow data according to a preset period through the data storage module, and recording the flow records within the preset period, including the average flow, maximum flow, minimum flow and cumulative flow (such as hourly accumulation, daily accumulation, and monthly accumulation values) of each preset period; the equipment operating status parameters are specifically used to reflect the parameters of the operating conditions of each component of the flow meter, including the signal amplitude in the vortex vibration signal output by the probe and the signal-to-noise ratio of the filtered signal, the drift of the instrument coefficient K, the deviation between the real-time flow and the historical average flow, and the data interaction response time of the communication link between the data storage module, the data transmission module and the main control unit.

[0027] In the present invention, the filtering processing of the signal processing module adopts an adaptive filtering algorithm, which is used to dynamically adjust the filtering parameters according to the amplitude fluctuation and noise characteristics of the vortex vibration signal; the adaptive filtering algorithm can accurately filter out environmental interference noise by dynamically adjusting parameters, improve the accuracy of vortex vibration signal extraction, and enhance measurement stability.

[0028] In the present invention, the vortex frequency and gas flow correlation algorithm preset in the flow calculation module includes a basic flow calculation formula and a comprehensive correction coefficient: The basic flow calculation formula is based on the linear relationship between vortex frequency and flow, specifically: Obtain the pre-processed vortex vibration signal and extract the number of vortices f generated per unit time in the signal; based on the linear correlation between the vortex frequency and the gas flow rate, combined with the preset instrument coefficient K of the flowmeter's mechanical structure parameters, calculate the expected gas flow rate value , the formula is ; The theoretical basis for the derivation of the basic flow calculation formula: Based on the "vortex precession effect" in fluid mechanics, the gas flowing through the spiral blades 9 generates a rotating vortex flow, and the vortex precession frequency is linearly positively correlated with the flow rate. According to the Bernoulli equation and the fluid continuity equation, when the inner diameter of the measuring tube 2 is fixed, the gas volume flow rate and the vortex frequency have a linear relationship, that is, ; The instrument coefficient K reflects the relationship between mechanical structure and flow-frequency. The derivation formula is: , where d is the inner diameter of the measuring tube 2, n is the number of spiral blades 9, and p is the lead of the spiral blades 9; the theoretical instrument coefficient K value is calculated using the above formula and then corrected by factory calibration (the calibration medium is a reference gas under standard conditions, covering the preset flow range) to determine the K value for actual application (calibration deviation ≤ preset threshold).

[0029] The gas type is determined by the preset gas type selection function (such as the parameter setting of the measurement display 6); the preset gas correspondence table is used to match the determined gas type with the preset gas correspondence table to output the gas correction value corresponding to the gas type The matching temperature sensor collects the real-time temperature of the measuring tube 2, and the matching piezoelectric sensor collects the real-time pressure in the measuring tube 2; the preset standard temperature and pressure in the measuring tube 2; the real-time temperature Divide by standard temperature Get the temperature ratio , the real-time pressure Divide by standard pressure Get the pressure ratio ; Get the temperature ratio and pressure ratio in unit time before the current moment, calculate their mean and variance respectively, and record the mean and variance of the temperature ratio as 、 ; The temperature correction value is obtained by weighting the current temperature ratio with its mean and variance. , the formula is , are the temperature weight coefficients of the temperature ratio and its mean and variance respectively; The mean and variance of the pressure ratio are recorded as 、 ; Perform weighted calculation on the current pressure ratio value and its mean and variance value to obtain the pressure correction value , the formula is , The pressure weight coefficients representing the pressure ratio and its mean and variance respectively; The comprehensive correction coefficient C is obtained by weighting the gas correction value, temperature correction value, and pressure correction value. The formula is: ; Where a1, a2, and a3 represent the weighted influence factors corresponding to the gas correction value, temperature correction value, and pressure correction value respectively; Among them, the gas correction value Matches: Establishment of preset gas correspondence table: Through experimental determination of physical characteristic parameters (density, , dynamic viscosity ), establish the correction value association model: , where 、 are the density and viscosity of the standard reference gas, 、 are the weight coefficients corresponding to density and viscosity respectively (specifically fitted through experiments); The user selects the gas type through the human-computer interaction module, and the system automatically calls the corresponding gas type from the preset table. value.

[0030] Apply the correction factor C to the expected gas flow value , get the final gas flow value under standard conditions; The expected gas flow rate The final gas flow value under standard conditions is recorded as real-time flow data and transmitted to the data storage module for storage.

[0031] It should be noted that the vortex frequency and gas flow correlation algorithm preset in the flow calculation module is based on the linear relationship between vortex frequency and flow, combined with gas type, real-time temperature and pressure parameters and historical fluctuation characteristics for multi-dimensional correction, which significantly improves the accuracy and stability of flow measurement under complex working conditions.

[0032] The present invention also includes a fault diagnosis module, a human-computer interaction module, and a data transmission module; The fault diagnosis module is connected to the signal processing module, the measuring head 4 and the flow calculation module respectively, and is used to monitor the equipment operation status in real time and diagnose the fault type, specifically: Identify the signal amplitude of the vortex vibration signal output by the probe and the signal-to-noise ratio of the filtered signal; then compare the deviation between the real-time flow output by the flow calculation module and the historical average flow, and record it as the historical real flow difference; Monitor the drift of instrument coefficient K; Detect the data interaction response time of the communication link between the data storage module, the data transmission module and the main control unit; record the signal amplitude, signal-to-noise ratio, historical actual flow difference, drift, and data interaction response time as diagnostic data; Mark any parameter in the diagnostic data as X, and set the normal range for any parameter in the diagnostic data. If any parameter in the diagnostic data is not within its set normal range, it means that the parameter is abnormal and the number of abnormalities is recorded. ; Identify the number of abnormal parameters within the preset diagnostic time zone; Calculate the statistical indicators of the parameters within the preset diagnostic time zone, including mean, variance, and range (the range is the difference between the maximum and minimum values ​​of the parameter value within the preset diagnostic time zone); Identify the n sampling values ​​of the preset diagnostic time zone, and their average The calculation formula is , i represents the number of sampling times; Variance of parameter X (Reflecting the degree of data fluctuation) The calculation formula is ; The range of parameter X , the calculation formula is ; The diagnostic value corresponding to the parameter is obtained by weighting each indicator and the number of abnormalities in the statistical indicators with their preset weights. The formula is: ;in, are the weight coefficients of mean, variance, range, and number of anomalies, respectively. The weights are determined by optimizing experimental data; Set the diagnostic threshold and compare the diagnostic value with the diagnostic threshold. If the diagnostic value is greater than or equal to the diagnostic threshold, it means that the parameter is abnormal and a fault code corresponding to the parameter is generated: Specifically, if the diagnostic value corresponding to the signal amplitude is greater than or equal to the corresponding diagnostic threshold, it is determined that the probe is faulty, and a fault code corresponding to the signal amplitude is generated; If the diagnostic value corresponding to the signal-to-noise ratio is greater than or equal to its corresponding diagnostic threshold, it is determined to be a signal interference fault and a fault code corresponding to the signal-to-noise ratio is generated; If the diagnostic value corresponding to the historical actual flow difference is greater than or equal to the corresponding diagnostic threshold, it is determined to be a calculation logic fault and a fault code corresponding to the historical actual flow difference is generated; If the diagnostic value corresponding to the drift is greater than or equal to the corresponding diagnostic threshold, it is determined to be a coefficient inaccuracy fault and a fault code corresponding to the drift is generated; If the diagnostic value corresponding to the data interaction response time is greater than or equal to the corresponding diagnostic threshold, it is determined to be an internal communication fault, and a fault code corresponding to the data interaction response time is generated; The human-computer interaction module is integrated into the measurement display 6 and is used to realize information interaction between the user and the device and to display the information stored in the data storage module; The data transmission module is in communication with the flow calculation module and the data storage module to realize external data interaction.

[0033] It should be noted that the fault diagnosis module accurately identifies the fault type and generates codes through multi-dimensional parameter monitoring and weighted diagnosis. Combined with the human-computer interaction and data transmission modules, it realizes equipment status visualization and external data interaction, thereby improving operation and maintenance efficiency.

[0034] Example To clearly illustrate the practical application effects of this application's solution, the solution is further elaborated below through a specific embodiment. This embodiment is based on the design of the "Swirl-Vortex Gas Flowmeter Hardware and Software Collaborative Architecture" of this application and is developed for urban natural gas gate station metering scenarios. Its hardware configuration and software interaction logic are fully compatible with the "Signal Acquisition-Intelligent Processing-Operation and Maintenance Diagnosis" technical concept of this application's solution, and is used to verify the feasibility, adaptability, and technical advantages of the solution under actual working conditions.

[0035] In this embodiment, the pipeline 1 adopts 20# seamless steel pipe and the measuring tube 2 adopts 304 stainless steel (with an inner wall narrowed end diameter of 120mm), which is compatible with the "fluid channel structure design" in the scheme; the vortex generating component is equipped with three brass spiral blades 9 (lead 150mm), and the measuring head is symmetrically provided with dual PZT-5H piezoelectric sensors, corresponding to the "vortex excitation-signal acquisition" technical logic of the scheme; the measurement display 6 integrates the SLXB type flow intelligent processing system, and the data transmission module supports NB-IoT wireless communication, and cooperates with the "intelligent processing-operation and maintenance interaction" functional module of this application. Through this embodiment, the full process technical implementation of the scheme from hardware collaboration to software intelligent operation and maintenance can be fully presented, verifying the practical application value of the scheme of this application.

[0036] (1) Implementation of real-time monitoring module Data acquisition and interface display: The piezoelectric sensor of the measuring head captures the vortex vibration signal (1-3mV analog value) in real time. After adaptive filtering by the signal processing module (sampling rate 8kHz), it is converted into a digital signal and transmitted to the measurement display 6.

[0037] The software's real-time monitoring interface uses a three-area layout: Top digital instrument panel: displays instantaneous flow rate (unit: m³ / h), font size dynamically adjusts with the value (range: 0-10000 m³ / h), and a unit switching button is set on the right (supports switching between m³ / h and Nm³ / h).

[0038] Middle trend area: A hyperbola is drawn using ECharts to display real-time changes in temperature (sampling period 1s) and pressure (sampling period 1s). The curve colors are orange (temperature) and blue (pressure), respectively. Hovering the mouse will display the exact value (e.g., "15:30:22 Temperature 18.5°C Pressure 1.2MPa").

[0039] Bottom status area: A bar graph displays the real-time signal-to-noise ratio (SNR) value, with three color warnings: green (SNR ≥ 20dB), yellow (15-20dB), and red (<15dB). The right side displays the device operation status code ("00" indicates normal).

[0040] Signal quality optimization mechanism: The software has a built-in signal quality assessment algorithm that calculates the signal-to-noise ratio every 500ms. When vibration interference from pipeline 1 is detected (SNR drops to 18dB), the signal processing module is automatically triggered to enhance the 50Hz power frequency suppression strength, raising the SNR to above 22dB within 3s. The "Anti-interference mode started" prompt is simultaneously displayed in the interface status area.

[0041] (2) Parameter configuration module implements basic parameter configuration process The operation and maintenance personnel enter the "Parameter Configuration" interface through the touch screen of the measurement display 6. The software supports the following operations: Gas type selection: Check "Natural Gas" in the drop-down menu, and the system automatically loads the preset gas parameters (density 0.72kg / m³, viscosity 1.1×10⁻ 5 Pa・s), correction value for related gases =1.03.

[0042] Standard working condition setting: default standard temperature , standard pressure , support manual modification (range : 0-30℃, : 0.1-0.15MPa). After modification, the software automatically updates the correction coefficient calculation formula parameters. Instrument coefficient calibration: Enter the calibration value through the "Coefficient Calibration" entry. The software stores three sets of historical calibration records (including timestamps). The current instrument coefficient \K=1000m³ / (h·Hz) (calculated based on a 120mm inner diameter measuring tube 2 and three blades).

[0043] Communication parameter configuration: In the "Communication Configuration" sub-screen, select the NB-IoT protocol, set the transmission interval (default 5 minutes, configurable from 1 to 60 minutes), enter the gateway IP and port number, and the software supports communication status self-test (sending heartbeat packets every 30 seconds). The screen will display "Connected to the cloud platform" or "Communication failure (code E10)."

[0044] (3) Implementation of flow calculation and correction module Basic flow calculation: The signal processing module extracts the vortex frequency f (unit Hz), and the software uses the formula Calculate the expected flow rate. For example: when the vortex frequency is detected to be 25Hz, =1000×25=25000m³ / h, and the results are stored in the data storage module in real time (one record every 1s).

[0045] Calculation of comprehensive correction coefficient: Temperature correction: The software collects temperature T=15℃ in real time and calculates the temperature ratio ; Call temperature data within 1 hour (3600 sampling points) and calculate the mean ,variance , by weight calculate .

[0046] Pressure correction: real-time pressure P=1.2MPa, pressure ratio ; Average pressure within 1 hour ,variance ; By weight calculate .

[0047] Comprehensive correction: calculated according to weights a1=0.2, a2=0.3, a3=0.5 The final flow rate Q = 25000 × 6.32 = 158000 m³ / h (standard state) is updated synchronously on the dashboard.

[0048] (IV) Implementation of the fault diagnosis module Multi-dimensional parameter monitoring: The software collects diagnostic data every 10 seconds, and the normal range is set as follows:

[0049] Troubleshooting Examples When dust accumulates on the probe causing abnormal signal amplitude: Abnormal identification: 60 samples are taken within 10 minutes, and the signal amplitude is averaged. , variance σ²=4, range R=10mV, number of abnormalities ; Diagnostic value calculation:

[0050] Fault judgment: The diagnostic threshold is set to 30. Since 42.3 ≥ 30, the fault code "E01-Probe signal attenuation" is generated, the interface flashes red to alarm, and the alarm is pushed to the cloud platform at the same time.

[0051] (V) Implementation of historical data and maintenance module Historical data management The data storage module records data according to the following rules: Real-time data: Stores one instantaneous flow, temperature, and pressure value every 1 second and retains it for 30 days.

[0052] Statistical data: Calculate average flow, maximum / minimum flow every hour, generate daily / monthly reports (including cumulative flow), and retain them for 1 year.

[0053] The software supports querying by time range (such as "2024-06-01 08:00 to 2024-06-01 18:00"), exporting reports in CSV format, and automatically generating traffic trend line charts in the chart area.

[0054] Equipment maintenance instructions When a decrease in vortex stability is detected (SNR fluctuation ≥ 5dB), the software automatically pushes a maintenance reminder: 3D interactive guidance: Display the exploded view of the vortex generating assembly on the "Equipment Maintenance" interface, mark the positions of the dovetail groove and the plug ring 7, and click "Disassembly Steps" to play the animation (rotate the swivel ring 11 → align the through groove → pull out the plug ring 7).

[0055] Maintenance record: Fill in the degree of blade wear ("mild / moderate / serious") and the replacement spare part number. The system will automatically associate it with the equipment file. During the next maintenance, it will prompt "30 days have passed since the last blade replacement.

[0056] (6) Implementation of data interaction module Cloud platform data synchronization The software uploads the following data every 5 minutes via the NB-IoT module: standard flow rate, real-time temperature / pressure, device status code, and fault information (if any). If an upload fails, the data is temporarily stored locally (up to 100 entries) and automatically re-uploaded when the connection is restored.

[0057] Remote control response The cloud platform supports issuing remote commands: such as changing the transmission interval ("Set the transmission period to 10 minutes") and starting calibration ("Perform probe sensitivity calibration"). After receiving the command, the software will pop up a confirmation window and return a "Command has taken effect" receipt after successful execution.

[0058] The calculation formulas involved in the present invention, such as the vortex frequency and gas flow correlation algorithm and the comprehensive correction coefficient, all adopt dimensionless numerical calculation (dimensionlessness can be achieved through standardization and other means, which will not be repeated here); the formulas are derived based on a large amount of data software simulation to be close to the actual working conditions, and the preset parameters (such as weight factors, diagnostic thresholds, etc.) are set by technical personnel in this field according to the actual scenario.

[0059] The flowmeter's signal processing, flow calculation, fault diagnosis and other functional modules can be implemented through software, hardware or a combination thereof; software implementation can be embodied as a computer program, stored in a computer-readable medium such as a USB flash drive, hard disk, ROM, RAM, etc., for executing the functions of each module.

[0060] The execution order of each module's processing flow is determined by the functional logic and is not restricted by the step number. The module division is only a logical function distinction, and can actually be integrated or split according to needs, and can be physically deployed in a centralized or distributed manner.

[0061] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0062] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A vortex precession gas flowmeter, characterized in that: The invention comprises a pipeline (1), wherein a measuring tube (2) is fixedly provided in the pipeline (1), a sealing ring (3) is provided on the middle hoop of the measuring tube (2), two measuring heads (4) are symmetrically fixedly provided on the sealing ring (3), and probes are provided on opposite surfaces of the two measuring heads (4), one end of the probes extends into the inner wall of the measuring tube (2), a vortex generating assembly is installed at one end of the measuring tube (2), a rectifier plate (5) is fixedly provided at the other end of the measuring tube (2), a measuring display (6) is installed on the outer wall of the pipeline (1), and flange rings are fixedly provided at both ends of the pipeline (1); The measurement display (6) on the outer wall of the pipeline (1) is internally integrated with a flow intelligent processing system, and the flow intelligent processing system includes a signal processing module, a flow calculation module, and a data storage module; The signal processing module is electrically connected to the probe of the measuring head (4), and is used to receive the vortex vibration signal collected by the probe, filter the signal to remove environmental interference noise, amplify the signal, and convert the amplified analog signal into a digital signal; The flow calculation module is in communication with the signal processing module and is used to convert the digital signal processed by the signal processing module into a corresponding gas flow value based on a preset vortex frequency and gas flow correlation algorithm, and the gas flow correlation algorithm is used to dynamically correct the gas flow value according to the gas type parameter, the real-time pressure parameter and the real-time temperature parameter; The data storage module is respectively connected to the signal processing module and the flow calculation module for recording real-time flow data, historical flow data, equipment operation status parameters and fault information within a preset time period.

2. A vortex precession gas flowmeter according to claim 1, characterized in that: The preset vortex frequency and gas flow correlation algorithm in the flow calculation module includes a basic flow calculation formula and a comprehensive correction coefficient. The basic flow calculation formula is constructed based on the linear relationship between the vortex frequency and the flow rate, and the comprehensive correction coefficient is determined according to the physical characteristic parameters corresponding to the gas type, the ratio of the real-time pressure to the standard pressure, and the ratio of the real-time temperature to the standard temperature.

3. A vortex precession gas flowmeter according to claim 1, characterized in that: It also includes fault diagnosis module, human-computer interaction module, and data transmission module; The fault diagnosis module is respectively connected to the signal processing module, the measuring head (4) and the flow calculation module for real-time monitoring of the equipment operation status and diagnosis of the fault type; The human-computer interaction module is integrated into the measurement display (6) and is used to realize information interaction between the user and the device and to display the information stored in the data storage module; The data transmission module is in communication with the flow calculation module and the data storage module to realize external data interaction.

4. A precession vortex gas flowmeter according to claim 1, characterized in that: The vortex generating assembly comprises a first flaring sleeve, wherein a smaller port of the first flaring sleeve is fixedly connected to the measuring tube (2), a plurality of dovetail grooves are equidistantly provided on the inner wall of the first flaring sleeve along the axial side, a plug-in ring (7) is sleeved on the inner wall of the first flaring sleeve, a plurality of dovetail blocks (8) corresponding to the dovetail grooves are equidistantly provided on the outer wall of the plug-in ring (7), and a plurality of spiral blades (9) coaxial with the pipe (1) are fixedly provided on the inner wall of the plug-in ring (7).

5. A precession vortex gas flowmeter according to claim 4, characterized in that: A mounting cylinder is fixedly connected to the axis of the spiral blade (9), and a spiral guide plate (10) is mounted on one end surface of the measuring tube (2). The shape of the spiral guide plate (10) corresponds to the shape of the inner wall of the first flaring sleeve. A second flaring sleeve is fixedly connected to the other end of the measuring tube (2). The inner wall cross-section of the measuring tube (2) is wide-mouthed, and the narrowed end of the wide-mouthed inner wall of the measuring tube (2) is located at the first flaring sleeve.

6. A precession vortex gas flowmeter according to claim 4, characterized in that: A rotating ring (11) is rotatably provided on the outer wall of one end of the first expansion sleeve, and an annular baffle (12) located in the dovetail groove is fixedly provided on the inner wall of the rotating ring (11), and a plurality of through grooves are formed on the annular baffle (12) in a staggered manner with the dovetail groove.

7. The precession vortex gas flowmeter according to claim 1, characterized in that: The probe is fixedly provided with a piezoelectric sensor on the inner wall of the measuring tube (2), and the bottom surface of the measuring display (6) is provided with a data line sleeve located in the pipe (1), and two transmission lines corresponding to the two measuring heads (4) are provided in the data line sleeve.

8. A precession vortex gas flowmeter according to claim 7, characterized in that: Threaded holes are provided on the opposite sides of the two measuring heads (4), and the ends of the transmission lines are fixedly connected with external threaded columns, and the transmission lines are screwed and fixed to the threaded holes of the measuring heads (4) through the external threaded columns.

9. The precession vortex gas flowmeter according to claim 1, characterized in that: Real-time monitoring of equipment operating status and diagnosis of fault types, specifically: Identify the signal amplitude of the vortex vibration signal output by the probe and the signal-to-noise ratio of the filtered signal; then compare the deviation between the real-time flow output by the flow calculation module and the historical average flow, and record it as the historical real flow difference; Detect the data interaction response time of the communication link between the data storage module, the data transmission module and the main control unit; record the signal amplitude, signal-to-noise ratio, historical actual flow difference, and data interaction response time as diagnostic data; Set a normal range for each parameter in the diagnostic data. If any parameter in the diagnostic data is not within its set normal range, it indicates that the parameter is abnormal, and the number of abnormalities is recorded; identify the number of abnormalities of the parameter within the preset diagnostic time zone; Calculate the statistical indicators of the parameters within the preset diagnostic time zone, including mean, variance, and range; Perform weighted calculation on each indicator and the number of abnormalities in the statistical indicators with their preset weights to obtain the diagnostic value corresponding to the parameter; Set the diagnostic threshold and compare the diagnostic value with the diagnostic threshold. If the diagnostic value is greater than or equal to the diagnostic threshold, it means that the parameter is abnormal and a fault code corresponding to the parameter is generated.

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