Portable multifunctional non-pressure pipeline flowmeter and measuring method thereof

Abstract

The invention discloses a portable multifunctional non-pressure pipeline flowmeter and a measuring method thereof, and belongs to the technical field of flow measurement. The novel flow meter and the measuring method thereof are designed to solve the problem that an existing sewage flow meter is not accurate in measurement due to sludge blockage and abrasion in a complex sewage pipeline. The flow meter comprises a data acquisition module and a data processing module, and through combination of an interface judgment probe, a sliding rod and a flow velocity measurement probe, accurate measurement of different medium interfaces and flow velocities of an overflowing section is achieved; performing numerical simulation by utilizing computational fluid mechanics, establishing a special point location flow velocity database, and performing intelligent calculation in combination with a data processing module to obtain the average flow velocity and flow of an overflowing section; the device improves the measurement precision, is suitable for non-pressure pipelines with various calibers, particularly solves the measurement problem under the condition of sludge deposition, and has the advantages of simple structure, wide measurement range, high precision and the like; and the portable design is adopted, so that on-site quick mounting and dismounting are facilitated, the maintenance cost and time are reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of flow measurement, and in particular to a portable multifunctional pressure-free pipeline flow meter and a measuring method thereof. Background Art

[0002] In the field of sewage flow measurement, existing technologies mainly include differential pressure flowmeters, open channel flowmeters, electromagnetic flowmeters, ultrasonic flowmeters, etc. These flowmeters have certain advantages in their respective application scenarios, but they also have significant limitations, especially when faced with complex sewage properties and a large amount of solid debris in the water body, their measurement accuracy and reliability are often seriously affected.

[0003] The differential pressure flowmeter, also known as the head velocity flowmeter, generates a head difference by setting a flow resistance member on the circulation pipeline, and determines the flow rate by using the numerical relationship between the head difference and the fluid flow rate. This flowmeter has the advantages of simple and reliable structure, strong applicability, insensitivity to vibration and strong anti-interference ability. However, its measurement accuracy is low, the installation requirements are high, the measurement range is narrow, and when used in small-diameter pipelines, the pressure pipe is easily blocked by solid particles, resulting in inaccurate measurement. In sewage flow measurement, especially for sewage containing a lot of solid debris, the application of differential pressure flowmeters is greatly limited.

[0004] Open channel flowmeters, including weir flowmeters and trough flowmeters, mainly calculate the total flow rate based on the average flow velocity and liquid level cross-sectional area. This type of flowmeter has high accuracy in open channel sewage measurement, and the weir flowmeter has a relatively simple structure. However, the weir flowmeter will produce greater resistance, raise the water level, and easily cause sedimentation problems; while the trough flowmeter has a complex structure and high maintenance costs. In addition, open channel flowmeters are more suitable for sewage pipes that are not full, not pressurized, and do not contain solid particles, but their measurement results are often poor in complex and changeable sewage pipe environments.

[0005] Electromagnetic flowmeters are based on the principle of electromagnetic induction and determine flow by measuring the electromotive force induced by a conductive fluid in an external magnetic field. This flowmeter has the advantages of simple structure, good energy saving, no influence from the physical and chemical properties of the fluid, and a large flow measurement range. However, it has strict requirements for selection and installation, and the manufacturing materials require special treatment. It is also greatly affected by external electromagnetics and is expensive. In sewage flow measurement, although the electromagnetic flowmeter can handle a certain degree of dirty solid-liquid two-phase flow, its requirements for the installation environment and cost considerations limit its widespread application.

[0006] Ultrasonic flowmeters use the propagation characteristics of ultrasonic waves in fluids to measure flow velocity and flow rate. They have the advantages of non-contact measurement and are not affected by fluid viscosity and other properties. Ultrasonic flowmeters have certain application value in difficult sewage measurement or large-caliber flow measurement. However, their measurement circuits are complex, their accuracy is affected by materials and integrated circuit technology, and the Doppler method has low measurement accuracy, resulting in unstable measurement results in complex sewage environments.

[0007] In addition to the above mainstream sewage flowmeters, float flowmeters, volumetric flowmeters, target flowmeters and turbine flowmeters are also used for sewage flow measurement under certain conditions. However, these flowmeters also have their own shortcomings. For example, float flowmeters are greatly affected by bubbles and tiny particles; volumetric flowmeters need to be installed with filters, which limits their scope of use; target flowmeters have low accuracy and narrow range; turbine flowmeters are gradually being eliminated due to difficult maintenance and severe wear.

[0008] In summary, existing sewage flow meters have varying degrees of deficiencies in terms of measurement accuracy, reliability, scope of application and cost. Especially when the sewage is complex and there is a lot of sediment in the pipeline, the existing flow meters are difficult to meet the needs of accurate measurement. Therefore, it is particularly important to develop a pressure-free pipeline flow meter that can adapt to complex sewage environments and has portable and multifunctional characteristics.

[0009] There are also studies on related technologies. For example, CN 111595391 B discloses a portable multifunctional flowmeter, which solves the problem of being difficult to carry and inaccurate measurement when there is a lot of sludge in the sewage pipe; the data processing terminal is connected to the data acquisition output device on the platform through a data line, an opening is provided on the platform, two parallel first slide bars are provided on both sides of the opening, a movable block is provided on the first slide bar to slide through, a second slide bar is connected between the movable blocks, a storage is provided at the connection between the second slide bar and the movable block through an electrical connection, a connecting block is provided on the second slide bar to slide through, a high-strength pipe is vertically provided on the connecting block to slide through, a flow rate measuring device is installed on the lower side of the high-strength pipe, and a water level mud level discrimination device is connected to the bottom end of the high-strength pipe; the flow rate and flow of water in the presence of sludge can be accurately calculated through the flow rate measuring device and the water level mud level discrimination device, and a program can be set to allow the device to automatically enter the sewage pipe; however, this invention has obvious disadvantages: 1. The working principle of the invention is not clear enough, the content is relatively general, and the practicability is not strong; although the invention proposes to measure the flow velocity of the flow section by means of a flow velocity measuring device, the working principle of the device or the principle of selecting the flow velocity measurement points is not described in detail; since the turbulent flow is very complicated and the flow velocity distribution is extremely uneven, the flow velocity of some points of the flow section is selected irregularly to solve the average flow velocity of the flow section. The average flow velocity of the section obtained may have a large error with the actual average flow velocity, and the reliability of the obtained data cannot be guaranteed, resulting in the poor practicability and scientificity of the invention; 2. The invention determines the water level and mud level by the change in resistance of the water level and mud level determination device after it enters the water body. However, the water conditions in sewage are complex, and various substances and solutions are intertwined and integrated, which will cause great interference to the determination of the water level and mud level device, resulting in data measurement distortion. Summary of the invention

[0010] The technical problem to be solved by the present invention is to provide a portable multifunctional pressureless pipeline flow meter and a measurement method thereof, so as to solve the technical problem in the field of sewage flow measurement, especially in pressureless pipelines, that traditional flow meters are prone to blockage and wear, and have low measurement accuracy due to the complex nature of sewage and the large amount of solid debris in the water body.

[0011] In order to solve the above technical problems, the technical solution adopted by the present invention is: a portable multifunctional pressure-free pipeline flow meter, including a data acquisition module and a data processing module, wherein the data acquisition module and the data processing module are connected via a data line, wherein: The data acquisition module includes an interface determination probe, a slide bar with a distance measurement function, and a flow rate measurement probe; the interface determination probe is used to measure the density of mud or solid particles in the liquid to indirectly measure the concentration or turbidity, thereby determining whether the probe has entered the water body or mud; a scale is provided on the slide bar to measure the depth of mud and water bodies at different flow sections; the flow rate measurement probe includes a speed measuring propeller, which calculates the flow rate at a specific point by the frequency of the propeller driven by the water flow; The data processing module is an intelligent integrated processor that receives data transmitted by the data acquisition module, simulates the flow section conditions in the pipeline and marks the water flow rate at the measurement point. It displays the flow section area and average flow rate through calculation, and further calculates the water flow rate based on the principles of hydraulics.

[0012] In a preferred embodiment, the slide rod is moved up and down, forward and backward, left and right, and locked in the flow meter through a sliding assembly and an adjusting mechanism to accurately measure the depth and interface position of air, water, and mud in the pipeline.

[0013] In a preferred embodiment, the flow meter also includes a moving platform, a plurality of support rods are hinged at the bottom of the moving platform, a sliding assembly is arranged at the top of the moving platform, the sliding assembly includes a group of first slide rails arranged in parallel, a second slide rail is vertically arranged between the group of first slide rails, and the second slide rail is slidably connected and fixed to the group of first slide rails through movable fasteners at both ends.

[0014] In the preferred scheme, a first scale is provided on the movable platform parallel to the second slide rail, a slide bar platform is slidably installed on the second slide rail, a slide bar is passed through the slide bar platform, the slide bar slides up and down on the slide bar platform, and is locked by an adjusting nut installed and fixed on the slide bar platform, a second scale is provided on the slide bar, the first scale and the second scale are both accurate to the millimeter level, a slide groove is provided on the movable platform and the second slide rail, and the two slide grooves are connected and penetrated, so that the slide bar slides back and forth in the slide groove.

[0015] In a preferred solution, the interface determination probe and the flow rate measurement probe are fixedly mounted on the lower part of the slide bar and are arranged to be in the same horizontal plane, so as to simultaneously determine the medium interface and measure the flow rate during the measurement process.

[0016] In a preferred solution, a hinge seat is provided at the bottom of the movable platform, and a hinge shaft is provided at the top of the support rod. The hinge shaft is rotatably installed in the hole of the hinge seat. Both the hinge seat and the hinge shaft are provided with pin holes. When the support rod is rotated to be perpendicular to the movable platform, the pin shaft is installed in the pin hole to fix the support rod to the movable platform.

[0017] A portable multifunctional pressureless pipeline flow meter measurement method is implemented by using any one of the portable multifunctional pressureless pipeline flow meters described above, and the measurement method comprises the following steps: Step 1: Use the interface determination probe to determine the probe position and distinguish between air, water and mud; Step 2: The slider measures and records the depth of mud and water at different flow sections; Step 3: The velocity measuring probe measures the velocity at a specific point and takes the average value as the average velocity of the flow section; Step 4: The data processing module calculates and displays the flow cross-sectional area, average flow velocity and water flow rate based on the measured data.

[0018] In the preferred solution, the data processing module in Step 4 also has the following functions: through the numerical simulation results, the fluid velocity distribution under the stable flow state is statistically analyzed, compared with the average velocity of the section, the special points to be measured are identified, and the flow cross-sectional area is calculated.

[0019] In a preferred embodiment, the data processing module is provided with a flow section database, which is established by a numerical simulation method and includes the selection of special points and calculation of flow section areas under different flow sections and silt depths to support the data processing module in accurately calculating the average flow velocity and flow rate of the section.

[0020] In a preferred solution, the numerical simulation adopts a VOF (Volume of Fluid) model and combines the SIMPLE (Semi-Implicit Method for Pressure-Linked Equations) algorithm to iteratively solve the flow field to ensure the accuracy and reliability of the simulation results.

[0021] The portable multifunctional pressure-free pipeline flow meter and the measuring method thereof provided by the present invention have the following beneficial effects: 1. The present invention solves the technical problem in the field of sewage flow measurement, especially in non-pressure pipelines, that the traditional flow meter is prone to blockage and wear, and has low measurement accuracy due to the complex nature of sewage and the large amount of solid debris in the water body. In particular, when there is silt in the pipeline, the traditional flow meter is very likely to cause measurement inaccuracy due to blockage, wear and other problems; 2. The present invention effectively avoids the blockage and wear of the flow measuring instrument by silt through the combined use of the interface determination probe and the slide rod; 3. The present invention adopts density measurement method, flow velocity propeller and numerical simulation technology to improve the accuracy of flow measurement; 4. The flow meter of the present invention has strong adaptability and can be applied to sewage pipes of different calibers and different siltation conditions; 5. The present invention significantly improves the measurement accuracy of sewage flow through the dual guarantee of interface determination and flow rate measurement; 6. The present invention has strong adaptability and can be applied to a variety of complex sewage pipe environments, thus expanding the application scope of the flow meter; 7. The portable design of the present invention reduces the complexity of equipment handling and installation, and reduces maintenance costs; 8. The intelligent data processing module of the present invention makes the measurement results intuitive and easy to read, improving the user experience; 9. The flow meter of the present invention adopts a portable design, which is convenient for quick installation and disassembly on site, reduces maintenance costs and time, and improves work efficiency; 10. The present invention has a compact structure, is easy to carry and install, is suitable for pressure-free pipes of different diameters, and improves the accuracy and convenience of sewage flow measurement; 11. The measurement results of the present invention can be transmitted wirelessly to a remote monitoring center to achieve remote monitoring and data analysis, providing a scientific basis for sewage treatment and pipeline maintenance; 12. The present invention also has a self-cleaning function, which uses a built-in micro-motor to drive the probe to automatically rotate and clean up attachments, ensuring long-term stable operation; the application of corrosion-resistant materials further extends the service life of the equipment and maintains high-precision measurement in harsh environments; 13. The portable multifunctional non-pressure pipeline flow meter of the present invention integrates a data acquisition module and a data processing module, realizing an integrated design from data acquisition to processing, improving measurement efficiency and portability. This integrated design is not common in existing sewage flow meters and has significant novelty; 14. The present invention adopts a combination of an interface determination probe and a flow velocity measurement probe to determine the interface between the water body and the mud by measuring the density of the mud or solid particles in the liquid, and then accurately measures the flow velocity at each point of the flow section. This combination is rare in the prior art and provides a novel measurement idea. 15. The present invention uses a slide bar with a distance measurement function to measure the depth of mud and water at different flow sections, and combines the results of the interface determination probe to perform automatic or manual measurement, thereby improving the measurement accuracy and scope of application. The application of this slide bar measurement technology in sewage flow meters also reflects novelty; 16. The present invention uses computational fluid dynamics (CFD) to perform numerical simulations on different flow sections, silt depths, etc., and establishes a database of special points in the flow section to provide a scientific basis for actual measurement. This method of numerical simulation and database support is innovative in the field of sewage flow meters. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 A top view of the overall structure of the present invention; Figure 3 It is a left side view of the overall structure of the present invention; In the figure: moving platform 1, sliding rod 2, first sliding rail 3, interface determination probe 4, flow rate measurement probe 5, support rod 6, second sliding rail 7, data processing module 8, sliding rod platform 9, moving fastener 10, first scale 11, adjusting nut 12, second scale 13, hinge seat 14, hinge shaft 15. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments: Example 1 like Figures 1 to 3As shown, a portable multifunctional non-pressure pipeline flow meter includes a data acquisition module and a data processing module, wherein the data acquisition module is connected to the data processing module 8 via a data line, wherein: The data acquisition module includes an interface determination probe 4, a slide bar 2 with a distance measurement function, and a flow rate measurement probe 5; the interface determination probe 4 is used to measure the density of mud or solid particles in the liquid to indirectly measure the concentration or turbidity, so as to determine whether the probe has entered the water body or mud; a scale is provided on the slide bar to measure the depth of mud and water at different flow sections; the flow rate measurement probe 5 includes a speed measuring propeller, which calculates the flow rate at a specific point by the frequency of the propeller driven by the water flow; The data processing module 8 is an intelligent integrated processor, which is used to receive the data transmitted by the data acquisition module, simulate the flow section conditions in the pipeline and mark the water flow rate at the measurement point, display the flow section area and average flow rate through calculation, and further calculate the water flow rate according to the hydraulic principles.

[0024] In this embodiment, the slide rod 2 is moved up and down, forward and backward, left and right, and locked in the flow meter through a sliding assembly and an adjusting mechanism to accurately measure the depth and interface position of air, water, and mud in the pipeline.

[0025] Furthermore, the flow meter also includes a moving platform 1, a plurality of support rods 6 are hinged at the bottom of the moving platform 1, a sliding assembly is arranged on the top of the moving platform 1, the sliding assembly includes a group of first slide rails 3 arranged in parallel, and a second slide rail 7 is vertically arranged between the group of first slide rails 3. The second slide rail 7 is slidably connected and fixed to the group of first slide rails 3 through movable fasteners 10 at both ends.

[0026] Furthermore, a first scale 11 is provided on the movable platform 1 parallel to the second slide rail 7, a slide bar platform 9 is slidably installed on the second slide rail 7, a slide bar 2 is passed through the slide bar platform 9, the slide bar 2 slides up and down on the slide bar platform 9, and is locked by an adjusting nut 12 installed and fixed on the slide bar platform 9, a second scale 13 is provided on the slide bar 2, and both the first scale 11 and the second scale 13 are set to be accurate to the millimeter level, and a slide groove is provided on the movable platform 1 and the second slide rail 7, and the two slide grooves are connected and penetrated, so that the slide bar 2 slides back and forth in the slide groove.

[0027] Furthermore, the interface determination probe 4 and the flow rate measurement probe 5 are fixedly mounted on the lower part of the slide bar 2 and are arranged to be in the same horizontal plane, so as to synchronously determine the medium interface and measure the flow rate during the measurement process.

[0028] Furthermore, a hinge seat 14 is provided at the bottom of the mobile platform 1, and a hinge shaft 15 is provided on the top of the support rod 6. The hinge shaft 15 is rotatably installed in the hole of the hinge seat 14. Both the hinge seat 14 and the hinge shaft 15 are provided with pin holes. When the support rod 6 is rotated to be perpendicular to the mobile platform 1, the pin hole is installed into the pin shaft to fix the support rod 6 to the mobile platform 1.

[0029] Example 2 In another preferred embodiment, based on the above embodiment 1, a portable multifunctional pressureless pipeline flow meter measurement method is implemented by using any of the above-mentioned portable multifunctional pressureless pipeline flow meters, and the measurement method comprises the following steps: Step 1: Use the interface determination probe 4 to determine the probe position and distinguish between air, water and mud; Step 2: Slide bar 2 measures and records the depth of mud and water at different flow sections; Step 3: The flow velocity measuring probe 5 measures the flow velocity at a special point, and takes the average value as the average flow velocity of the flow section; Step 4: The data processing module 8 calculates and displays the flow cross-sectional area, average flow velocity and water flow rate based on the measured data.

[0030] In this embodiment, the data processing module 8 in Step 4 also has the following functions: through numerical simulation results, statistics are collected on the fluid flow velocity distribution under stable flow state, compared with the average flow velocity of the section, the special points to be measured are identified, and the flow cross-sectional area is calculated.

[0031] Furthermore, the data processing module 9 is provided with a flow section database, which is established by a numerical simulation method and includes the selection of special points and calculation of flow section areas under different flow sections and silt depths, so as to support the data processing module in accurately calculating the average flow velocity and flow rate of the section.

[0032] Furthermore, the numerical simulation adopts the VOF model and combines the SIMPLE algorithm to perform iterative solution of the flow field to ensure the accuracy and reliability of the simulation results.

[0033] Example 3 In another preferred embodiment, based on the above-mentioned embodiments 1 and 2, a portable multifunctional pressure-free pipeline flow meter includes a data acquisition module and a data processing module 8, which are connected by a data line to realize data transmission and processing.

[0034] 1. Data acquisition module The data acquisition module is mainly composed of an interface determination probe 4, a slide bar 2 with a distance measurement function, and a flow rate measurement probe 5; these components are fixed on the mobile platform 1 through a support rod 6 to ensure the stability and accuracy of the measurement.

[0035] Interface judgment probe 4: The interface judgment probe indirectly judges the position of the probe (air, water or mud) by measuring the density of mud or solid particles in the liquid; when the probe enters the water from the air, since the density of the water is lower than that of the mud, the value detected by the interface judgment probe will change from 0 to a significant value, thereby determining that the probe has entered the water; similarly, when the probe enters the mud from the water, the value will increase significantly again, thereby accurately judging the position of the probe.

[0036] Slider 2: Slider 2 is marked with a scale accurate to the millimeter level, which is used to measure the mud and water depths of the flow sections at different positions during the dive. By combining the readings of the interface judgment probe, the slider can automatically record the relative positions of each interface and calculate the depth of each type of medium. In addition, manual measurements can also be performed by reading the slider scale to verify the accuracy of the automated measurement.

[0037] Flow velocity measuring probe 5: The main component of the flow velocity measuring probe 5 is a velocity measuring propeller, which calculates the flow velocity by the frequency of propeller rotation caused by the water flow. Different models of flow velocity measuring probes 5 can be selected for different pipe diameters to meet different measurement requirements. In actual operation, the flow velocity at a specific point (such as a point with the same average flow velocity as determined by computational fluid dynamics (CFD) simulation) is measured, and the average value is taken as the average flow velocity of the flow section.

[0038] 2. Data processing module 8 The data processing module 8 is an intelligent integrated processor, which is responsible for receiving the data transmitted by the data acquisition module and processing and analyzing it; by simulating the flow section in the pipeline and marking the water flow rate at the measuring point, the data processing module can calculate the flow section area, the average flow rate, and further calculate the water flow rate according to the hydraulic principles.

[0039] In the data processing process, the established flow section database is used, combined with the judgment of the distribution status of sludge, water, etc. in the pipeline, to identify the special points that need to be measured; by measuring and averaging the flow velocity at these points, the accurate average flow velocity of the flow section is obtained; at the same time, the mathematical calculation method in the data processing module is used to calculate the area of ​​the determined height of air, water, and sludge, so as to obtain the accurate flow section area. The specific calculation principle and process are as follows: In fluid mechanics, the flow section is a cross section orthogonal to all streamlines of the elementary flow or total flow, that is, a plane perpendicular to the flow velocity cluster; since the water in the pipe is usually turbulent, its motion elements are disordered, and the fluid particles are mixed with each other, which has a certain randomness, so it is extremely difficult to measure the average flow velocity of the flow section; computational fluid dynamics (CFD) can solve the control equations of fluid mechanics through computers and numerical methods, thereby simulating and analyzing fluid mechanics problems. In the selection of special points, computational fluid dynamics (CFD) is used to perform numerical simulations of different flow sections, silt depths, etc., simulate the flow state of the real pipeline under the condition of siltation, extract the point group with the same average flow velocity in the flow section and form a database. When calculating the average flow velocity of the flow section in real situations, we clearly identify the special points that can be selected based on the judgment of the flow section conditions, measure the flow velocities of several special points and take the average value as the average flow velocity of the flow section. After the average flow velocity of the section and the flow section area are calculated, according to the flow formula Calculate the flow rate, where For flow, is the average flow velocity in the cross section, is the flow cross-sectional area.

[0040] The data processing module is mainly an intelligent integrated processor. By collecting and processing the data from the data acquisition module, it simulates the flow section in the pipeline and marks the water flow rate at the measurement point. Through data integration, the flow section area and average flow rate are calculated and displayed, and the water flow rate is further calculated based on the hydraulic principle.

[0041] Through numerical simulation, the database of flow sections is established, and the selection of special points of different flow sections and the calculation of flow section area are obtained. When establishing the numerical simulation model, it is considered that the fluid flow is controlled by the basic physical conservation laws, and the laws of conservation of mass, momentum and energy must be followed. The description of the basic physical conservation laws exists in the form of control equations, and the specific mathematical expression formula is as follows: (1) Continuity equation Assuming the fluid is a three-dimensional compressible fluid, the continuity equation is as follows: (1) In the formula, is the fluid density, for Point fluid velocity, For time, is the displacement change.

[0042] (2) Momentum conservation equation The momentum equation is the mathematical expression of the law of conservation of momentum. The tensor form of its differential equation is as follows: (2) In the formula, For pressure, is the dynamic viscosity, is the external source term, , They are , Point fluid velocity, is the fluid density.

[0043] (3) Energy conservation equation The mathematical expression of the law of conservation of energy is as follows: (3) In the formula, represents temperature, is the fluid velocity, represents the heat transfer coefficient of the fluid, It refers to the part of the fluid mechanical energy that is converted into heat energy due to viscosity. represents specific heat capacity, v is velocity, To take the partial derivative of a vector.

[0044] The VOF model is selected in the model. The VOF model is an interface tracking technology applied to two or more immiscible fluids on a fixed Euler grid, including the simulation of two-phase flow between water and air, and uses a single fluid model to solve multiphase flow problems.

[0045] Computational fluid dynamics (CFD) combines the basic theories of modern fluid mechanics, numerical mathematical methods, and computer science with strong computing power to perform numerical simulations on various fluid mechanics problems that arise in actual engineering. By discretizing the computational region to form smaller sub-intervals, the integral and differential terms in the fluid mechanics control equations will be approximately expressed in discrete form, and then the algebraic equations of each node transformed from the control equations will be solved.

[0046] The current mainstream CFD software includes Fluent, CFX, Flow-3D, Phoenics, Comsol, etc. Among them, Fluent is well-known for its rich models, advanced numerical calculation methods and powerful pre- and post-processing functions, and is widely used in aerospace, automotive design, oil and gas, water supply and drainage engineering and other fields.

[0047] In Fluent software, the SIMPLE algorithm is used for iterative solution of the flow field. This algorithm combines the continuity equation with the momentum equation. The SIMPLE algorithm is based on pressure correction. It assumes the pressure field to solve the momentum equation to obtain the velocity field, and then uses the velocity field to solve the continuity equation to correct the pressure field until convergence. The calculation process is "guess-correction".

[0048] After the numerical simulation calculation converges, the distribution of fluid velocity under stable flow state is compared with the average velocity of the section, and the position of points consistent with the average velocity of the section is counted. On the basis of fully considering different situations, a large number of numerical simulations are carried out and a database is formed, which is recorded in the data processing module. In the application process, by judging the distribution state of silt, water body, etc. in the pipeline, it is compared with the database to clarify the special points to be measured, and then the average velocity of the section is measured. For the cross-sectional area of ​​the flow, after determining the height of air, water body and silt, the mathematical calculation method in the data processing module is used to calculate the area.

[0049] 3. Effects of the implementation example: By implementing the present invention, the problems of low measurement accuracy and easy clogging of traditional sewage flow meters in complex sewage environments are solved. The accurate application of the interface determination probe makes the measurement process more accurate and can adapt to water bodies and muds of different concentrations. At the same time, the flexible selection of flow rate measurement probes and the intelligent processing of data processing modules ensure the accuracy and reliability of the measurement results. In addition, the present invention is also characterized by strong portability, which is convenient for measurement operations in different scenarios.

[0050] In the preferred solution, the slide bar 2 is moved up and down, forward and backward, left and right, and locked in the flow meter through a sliding assembly and an adjusting mechanism to accurately measure the depth and interface position of the air, water, and mud in the pipeline; the above settings ensure the accuracy and reliability of the measurement data and effectively respond to the challenges of a complex fluid environment; at the same time, the design of the adjusting mechanism enables the operator to easily adjust the position of the slide bar 2 to achieve fast and efficient measurement operations.

[0051] In the preferred scheme, the flowmeter also includes a moving platform 1, a plurality of support rods 6 are hinged at the bottom of the moving platform 1, a sliding assembly is arranged on the top of the moving platform 1, the sliding assembly includes a group of first slide rails 3 arranged in parallel, a second slide rail 7 is vertically arranged between the group of first slide rails 3, and the second slide rail 7 is slidably connected and fixed to the group of first slide rails 3 through movable fasteners 10 at both ends; the above arrangement ensures that the position and angle of the flowmeter can be flexibly adjusted during installation and maintenance; the design of the moving platform 1 enhances the mobility and stability of the equipment, and the precise structure of the sliding assembly ensures that the flowmeter can be accurately positioned to meet the measurement requirements under different working conditions.

[0052] In the preferred scheme, a first scale 11 is provided on the movable platform 1 parallel to the second slide rail 7, a slide bar platform 9 is slidably installed on the second slide rail 7, a slide bar 2 is passed through the slide bar platform 9, the slide bar 2 slides up and down on the slide bar platform 9, and is locked by an adjusting nut 12 installed and fixed on the slide bar platform 9, a second scale 13 is provided on the slide bar 2, the first scale 11 and the second scale 13 are both accurate to the millimeter level, a slide groove is provided on the movable platform 1 and the second slide rail 7, and the two slide grooves are connected and penetrated, so that the slide bar 2 slides back and forth in the slide groove; the above arrangement facilitates the precise adjustment and positioning of the slide bar 2 in the three-dimensional direction, ensuring the accuracy and stability of the operation; at the same time, the millimeter-level accuracy of the scale further improves the fineness of the adjustment to meet the needs of high-precision operations.

[0053] In the preferred solution, the interface determination probe 4 and the flow rate measurement probe 5 are installed and fixed at the lower part of the slide bar 2, and are arranged to be in the same horizontal plane, so as to simultaneously determine the medium interface and measure the flow rate during the measurement process; the above arrangement ensures the accuracy and consistency of the measurement data; at the same time, the slide bar 2 is designed with an adjustment mechanism, which allows the probe position to be fine-tuned according to actual needs to meet the measurement requirements of different media and environmental conditions.

[0054] In the preferred solution, a hinge seat 14 is provided at the bottom of the mobile platform 1, and a hinge shaft 15 is provided at the top of the support rod 6. The hinge shaft 15 is rotatably installed in the hole of the hinge seat 14. The hinge seat 14 and the hinge shaft 15 are both provided with pin holes. When the support rod 6 is rotated to be perpendicular to the mobile platform 1, the pin hole is inserted into the pin shaft to fix the support rod 6 to the mobile platform 1. The above settings enable the support rod 6 to flexibly adjust the angle and stably support the mobile platform 1 to meet the needs of different working scenarios. At the same time, the design of the pin shaft facilitates the rapid locking of the support rod position, thereby improving operational efficiency and safety.

[0055] In the preferred scheme, the data processing module 8 in Step 4 also has the following functions: through the numerical simulation results, the fluid flow velocity distribution under the stable flow state is statistically analyzed, compared with the average flow velocity of the section, the special points to be measured are clarified, and the flow cross-sectional area is calculated; the above settings effectively improve the accuracy and efficiency of data processing, provide more detailed and comprehensive data support for fluid dynamics analysis, and ensure the accuracy of model verification and optimization in subsequent steps.

[0056] In the preferred scheme, the data processing module 9 is provided with a flow section database, which is established through a numerical simulation method and includes special point selection and flow section area calculation under different flow sections and silt depths to support the data processing module in accurately calculating the average flow velocity and flow rate of the section; the above settings effectively improve the accuracy and efficiency of the data processing module in processing complex water flow conditions, provide strong technical support for water conservancy projects, environmental monitoring and other fields, and ensure the scientificity and accuracy of data analysis and decision making.

[0057] In the preferred solution, the numerical simulation adopts the VOF model and combines the SIMPLE algorithm to iteratively solve the flow field to ensure the accuracy and reliability of the simulation results; the above settings fully consider the fluid inlet velocity, pressure distribution and outlet boundary conditions in terms of boundary conditions, and at the same time introduce dynamic grid technology to deal with the dynamic changes of the boundary within the fluid domain, further improving the accuracy and applicability of the simulation.

[0058] In summary, a portable multifunctional pressure-free pipeline flow meter and its measurement method solve the problem of inaccurate measurement of existing sewage flow meters in complex sewage pipes due to silt blockage, wear and other problems; the flow meter of the present invention realizes accurate measurement of the flow velocity of the flow section in the sewage pipe and the thickness of silt inside the pipe by integrating the data acquisition module and the data processing module 8; the present invention can accurately measure the flow velocity of each point in the flow section and calculate the average flow velocity of the flow section through the combination of the interface judgment probe 4 and the flow velocity measurement probe 5, and the application of the slide bar 2 measurement technology, thereby significantly improving the measurement accuracy. This technological breakthrough embodies the creativity of the present invention; the flow meter of the present invention is not only suitable for pipes of different calibers, but also can adapt to the measurement environment of complex sewage containing silt, solid particles, etc. This wide applicability embodies the present invention in solving The invention is creative in solving practical problems; the data processing module 8 of the invention adopts an intelligent integrated processor, which can simulate the flow section in the pipeline and mark the water flow rate at the measuring point, and calculate the flow section area, average flow rate and water flow rate through data integration. This intelligent data processing method improves the convenience and accuracy of measurement, and is also an important manifestation of the creativity of the invention; the invention proposes a new solution to the problem of measurement inaccuracy caused by silt blockage and wear of existing sewage flow meters in complex sewage pipes. Through integrated design, innovative measurement technology and intelligent data processing method, accurate measurement of sewage flow is achieved. This innovative solution is the key to the invention obtaining patent protection, and it realizes accurate measurement of flow in complex sewage environment, which has important practical value and promotion prospects.

Claims

1. A portable multifunctional non-pressure pipeline flow meter, characterized in that: It comprises a data acquisition module and a data processing module, wherein the data acquisition module and the data processing module (8) are connected via a data line, wherein: The data acquisition module comprises an interface determination probe (4), a slide bar (2) having a distance measurement function, and a flow velocity measurement probe (5); the interface determination probe (4) is used to measure the density of mud or solid particles in the liquid, so as to indirectly measure the concentration or turbidity, thereby determining whether the probe has entered the water body or mud; a scale is provided on the slide bar (2) for measuring the depth of mud and water bodies at different flow sections; the flow velocity measurement probe (5) comprises a speed measuring propeller, and the flow velocity at a specific point is calculated by the frequency of rotation of the propeller driven by the water flow; The data processing module (8) is an intelligent integrated processor, which is used to receive data transmitted by the data acquisition module, simulate the flow section conditions in the pipeline and mark the water flow rate at the measurement point, display the flow section area and average flow rate through calculation, and further calculate the water flow rate according to the hydraulic principle.

2. A portable multifunctional non-pressure pipeline flow meter according to claim 1, characterized in that: The slide bar (2) is moved up and down, forward and backward, left and right, and locked in the flow meter through a slide assembly and an adjustment mechanism, so as to accurately measure the depth and interface position of air, water, and mud in the pipeline.

3. A portable multifunctional non-pressure pipeline flow meter according to claim 2, characterized in that: The flow meter further comprises a moving platform (1), a plurality of support rods (6) being hingedly connected at the bottom of the moving platform (1), a sliding assembly being arranged at the top of the moving platform (1), the sliding assembly comprising a group of first slide rails (3) arranged in parallel, second slide rails (7) being arranged vertically between the group of first slide rails (3), and the second slide rails (7) being slidably connected and fixed to the group of first slide rails (3) via moving fasteners (10) at both ends.

4. A portable multifunctional non-pressure pipeline flow meter according to claim 3, characterized in that: The movable platform (1) is provided with a first scale (11) parallel to the second slide rail (7), a slide bar platform (9) is slidably mounted on the second slide rail (7), a slide bar (2) is mounted on the slide bar platform (9), the slide bar (2) slides up and down on the slide bar platform (9) and is locked by an adjusting nut (12) fixed on the slide bar platform (9), a second scale (13) is provided on the slide bar (2), the first scale (11) and the second scale (13) are both accurately set to the millimeter level, and a slide groove is provided on the movable platform (1) and the second slide rail (7), and the two slide grooves are connected and penetrated, so that the slide bar (2) slides back and forth in the slide groove.

5. A portable multifunctional non-pressure pipeline flow meter according to claim 4, characterized in that: The interface determination probe (4) and the flow rate measurement probe (5) are mounted and fixed on the lower part of the slide bar (2) and are arranged to be on the same horizontal plane, so as to simultaneously determine the medium interface and measure the flow rate during the measurement process.

6. A portable multifunctional non-pressure pipeline flow meter according to claim 5, characterized in that: The bottom of the mobile platform (1) is provided with a hinge seat (14), and the top of the support rod (6) is provided with a hinge shaft (15). The hinge shaft (15) is rotatably mounted in a hole of the hinge seat (14). Both the hinge seat (14) and the hinge shaft (15) are provided with pin holes. When the support rod (6) is rotated to be perpendicular to the mobile platform (1), the pin shaft is inserted into the pin hole to fix the support rod (6) and the mobile platform (1).

7. A portable multifunctional non-pressure pipeline flow meter measurement method, which is implemented by using a portable multifunctional non-pressure pipeline flow meter according to any one of claims 1 to 6, and the measurement method comprises the following steps: Step 1: Use the interface determination probe (4) to determine the probe position and distinguish between air, water and mud; Step 2: The slider (2) measures and records the depth of mud and water at different flow sections; Step 3: The flow velocity measuring probe (5) measures the flow velocity at a specific point and takes the average value as the average flow velocity of the flow section; Step 4: The data processing module (8) calculates and displays the flow cross-sectional area, average flow velocity and water flow rate based on the measured data.

8. The measuring method of a portable multifunctional non-pressure pipeline flowmeter according to claim 7 is characterized in that: The data processing module (8) in Step 4 also has the following functions: statistically analyzing the fluid velocity distribution under the stable flow state through the numerical simulation results, comparing it with the average velocity of the section, identifying the special points to be measured, and calculating the flow cross-sectional area.

9. The measuring method of a portable multifunctional pressure-free pipeline flowmeter according to claim 8, characterized in that: The data processing module (9) is provided with a flow section database, which is established by a numerical simulation method and includes the selection of special points and calculation of flow section areas under different flow sections and silt depths, so as to support the data processing module in accurately calculating the average flow velocity and flow rate of the section.

10. The measuring method of a portable multifunctional non-pressure pipeline flowmeter according to claim 9, characterized in that: The numerical simulation adopts the VOF model and combines the SIMPLE algorithm to perform iterative solution of the flow field to ensure the accuracy and reliability of the simulation results.

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