Tap water pipeline propeller liquid level coupling flow velocity detection device
By installing a propeller-coupled flow velocity detection device inside the tap water pipeline, and combining multi-point flow velocity and liquid level data, the measurement error caused by uneven flow field and gas-liquid mixing is solved, enabling accurate flow calculation and uniform mixing of reagents, reducing costs and improving adaptability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-15
- Publication Date
- 2026-03-06
AI Technical Summary
In urban existing pipe networks and temporary disinfection operation ports with partial filling conditions, the uneven flow field in the tap water pipes, partial filling, and gas-liquid mixing and other complex situations lead to large errors in single-point velocity measurement or external measurement, which cannot meet the requirements for accurate control of reagent dosing.
A propeller-coupled flow velocity detection device for tap water pipelines is adopted. By installing an adjustable propeller module and a level sensor inside the pipeline, and combining multi-point flow velocity measurement and real-time level data, the control module performs filtering, calibration and calculation to achieve accurate flow estimation.
It significantly improves the accuracy of flow measurement, enhances reagent mixing, adapts to different inner diameters and filling heights, reduces hardware costs, and is easy to maintain.
Smart Images
Figure CN223976694U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipeline flow velocity detection technology, specifically a propeller liquid level coupling flow velocity detection device for tap water pipelines. Background Technology
[0002] The chemical control of water quality in a tap water system is inextricably linked to the flow velocity of water within the tap water pipes. The chemicals added during chemical control need to be carried by the water flow to reach all parts of the pipe network. If the flow velocity is too low, the chemicals will diffuse slowly and stagnate in the pipes, resulting in excessively high concentrations in some areas and insufficient concentrations in distant areas. At the chemical dosing point, sufficient flow velocity and turbulence are prerequisites for ensuring rapid and uniform mixing of chemicals and water. Flow velocity monitoring can determine whether the current hydraulic conditions are suitable for mixing.
[0003] Currently, commonly used equipment for instantaneous flow measurement in tap water pipelines includes electromagnetic flowmeters, ultrasonic time-of-flight flowmeters, Doppler flowmeters, differential pressure gauges such as orifice plates, and external or internal single-point mechanical rotor velocity sensors or impeller sensors. However, in urban existing pipe networks and under the condition of partial filling at temporary disinfection operation ports, there are complex situations such as uneven flow field, partial filling, gas-liquid mixing, and large disturbances inside the pipe, which leads to large errors in single-point velocity measurement or external measurement. Therefore, single-point measurement of the flow velocity inside tap water pipelines cannot meet the requirements for accurate control of reagent dosing. Therefore, there is an urgent need for a propeller liquid level coupled flow velocity detection device for tap water pipelines to solve the above-mentioned technical problems. Utility Model Content
[0004] The purpose of this utility model is to provide a technical solution for a propeller liquid level coupling flow velocity detection device for tap water pipelines, in order to solve the technical problem proposed in the prior art that, under the condition of partial filling of existing urban pipe networks and temporary disinfection operation ports, there are complex situations such as uneven flow field, partial filling, gas-liquid mixing, and large disturbance inside the pipe, which leads to large errors in single-point velocity measurement or external measurement, and the single-point measurement of the flow velocity inside the tap water pipeline cannot meet the requirements for accurate control of reagent dosing.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a water pipe propeller liquid level coupling flow velocity detection device, including an installation adjustment component that extends into the water pipe through a pipe inspection port, at least two propeller modules are arranged longitudinally on the installation adjustment component, the propeller modules are detachably connected to the installation adjustment component, each of the at least two propeller modules is provided with a detection unit for propeller speed detection, and a liquid level sensor is detachably installed in front of the topmost propeller module on the installation adjustment component;
[0006] It also includes a control module, and the output terminals of the detection unit and the liquid level sensor are electrically connected to the input terminal of the control module.
[0007] Preferably, the detection unit is the rotor of a propeller module, and at least one of a magnetic encoder, an optical encoder, and a Hall sensor is installed on the rotor.
[0008] Preferably, the installation adjustment component is a telescopic mounting rod or guide rail for adjusting the position of the propeller module inside the water pipe.
[0009] Preferably, the control module includes a microcontroller, an A / D module, an input filtering module, a storage module, a communication interface, and a drive power supply;
[0010] The output terminals of the detection unit and the liquid level sensor are electrically connected to the input terminal of the input filtering module, the output terminal of the input filtering module is electrically connected to the input terminal of the A / D module, and the output terminal of the A / D module is electrically connected to the input terminal of the microcontroller.
[0011] The microcontroller's output is electrically connected to the storage module and the communication interface;
[0012] The drive power supply provides electrical energy to the detection device.
[0013] Preferably, a baffle is also installed on the mounting adjustment component, at the same horizontal plane as the propeller module.
[0014] Preferably, the aerodynamic component consists of several guide vanes or hollow blades.
[0015] Preferably, the propeller is further provided with at least one of the following: a detachable protective cover, a cleaning brush, a sampling port, and a rinsing interface.
[0016] Preferably, the propeller is further provided with a damping structure and / or a guiding structure.
[0017] Compared with the prior art, the beneficial effects of this utility model are:
[0018] It can improve measurement accuracy: by measuring the flow velocity at multiple points at different heights and combining it with the real-time liquid level, it can significantly reduce the error caused by single-point velocity measurement in partially filled or non-uniform flow fields, thereby improving the accuracy of flow estimation.
[0019] Enhanced drug mixing effect: The propeller module, combined with the synchronous rotation strategy of the turbulence component, can improve the mixing effect at the moment of drug dosing, promote the rapid dispersion of disinfectant, improve disinfection efficiency and reduce the risk of excessive drug solution;
[0020] It can adapt to partial filling conditions: the liquid level sensor directly measures the water depth, which enables accurate calculation of the wet cross-sectional area and automatic selection of effective velocity measurement points when the pipeline is not full.
[0021] Highly adaptable to installation: The propeller module is adjustable in position on the mounting bracket, suitable for pipes of different inner diameters. On-site, only the fixed position needs to be adjusted according to the pipe diameter; it has good compatibility with different diameters and filling heights.
[0022] Cost and maintenance advantages: Compared with full-range electromagnetic or ultrasonic Doppler measurement solutions, this device has lower hardware costs and is easier to maintain in small-diameter or temporary disinfection scenarios; functionality can be restored simply by replacing a single propeller module. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of the water pipe propeller liquid level coupling flow velocity detection device of this utility model.
[0024] The numbers in the diagram are: 100, mounting and adjusting components; 200, propeller module; 300, liquid level sensor; 400, flow disruptor. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0026] Example: Figure 1 As shown, a water pipe propeller liquid level coupling flow velocity detection device is disclosed, including an installation adjustment component 100. Three propeller modules 200 are detachably and longitudinally arranged on the installation adjustment component 100 via fixing buckles. Specifically, the installation adjustment component 100 is a telescopic installation rod or guide rail for adjusting the setting position of the propeller modules 200 inside the water pipe. Its length is adjustable. In this embodiment, the length adjustable installation adjustment component 100 can adapt to water pipes of different depths. As for the installation position of the propeller modules 200, it can be adjusted according to the actual situation. The fixing buckles are adapted to DN50, DN80, or DN100.
[0027] In this embodiment, the three propeller modules 200 are installed inside the water pipe at positions from bottom to top: 5-10mm from the bottom of the pipe, at the center line of the pipe diameter, and 5-10mm from the top of the pipe. The diameters of the three propeller modules 200 distributed inside the water pipe from bottom to top are 25mm, 35mm, and 25mm, respectively.
[0028] It should be noted that each of the three propeller modules 200 is equipped with a detection unit. Specifically, the detection unit is the rotor of the propeller module. The rotor is equipped with a magnetic encoder, optical encoder, or Hall sensor to detect the rotational speed of the propeller module 200. In this embodiment, it is recommended to use a rotor with magnets + an external Hall sensor or photoelectric encoder because the Hall method has a simple structure, is water-resistant, and is easy to package. The output square wave pulse is also easy to calculate later.
[0029] For example, the propeller in each propeller module 200 is a small axial propeller made of corrosion-resistant materials such as stainless steel or engineering plastics, such as PPO or PA66+glass fiber, in order to prevent the propeller from corroding during long-term use.
[0030] The propeller is also provided with at least one of the following: a detachable protective cover, a cleaning brush, a sampling port, and a rinsing interface, to facilitate cleaning of the propeller or water sampling. Since these are conventional techniques for those skilled in the art, they will not be described in detail in this embodiment.
[0031] At the tail of each propeller module 200, i.e., at the same horizontal level as the propeller module 200 and downstream in the direction of water flow, a flow-disrupting element 400 is provided. In this embodiment, the flow-disrupting element 400 is composed of several guide vanes or hollow blades, such as... Figure 1 As shown, the turbulence-disrupting component 400 can act as a stirrer to agitate the liquid medicine, and also prevent the generation of bubbles from affecting the rotational speed measurement of the propeller module 200.
[0032] In this embodiment, each propeller module 200 is provided with a damping structure and / or a guiding structure, which can effectively reduce the local excitation and jamming phenomenon of the propeller module 200, thus affecting the speed measurement of the propeller module 200. The damping structure and / or guiding structure can be set according to actual needs. Since existing technologies can be used, they will not be described in detail in this embodiment.
[0033] A liquid level sensor 300 is detachably installed in front of the topmost propeller module 200 on the mounting adjustment component 100. In this embodiment, "in front" means that the liquid level sensor 300 is upstream of the water flow direction relative to the propeller module 200. The liquid level sensor 300 is used to measure the height h from the bottom of the pipe to the liquid surface. It can be a non-contact ultrasonic, pressure-type liquid level gauge (hydrostatic), or capacitive / radar sensor. The output standard of the liquid level sensor 300 is 4-20mA and 0-5V, respectively, depending on the application scenario.
[0034] In this embodiment, a control module is also included, wherein the control module includes a microcontroller, an A / D module, an input filtering module, a storage module, a communication interface, and a drive power supply;
[0035] The output terminals of the detection unit and the liquid level sensor are electrically connected to the input terminal of the input filtering module, the output terminal of the input filtering module is electrically connected to the input terminal of the A / D module, and the output terminal of the A / D module is electrically connected to the input terminal of the microcontroller.
[0036] The microcontroller's output is electrically connected to the storage module and the communication interface;
[0037] The driving power supply provides power to the detection device. For example, the power supply is 12VDC (which can be connected to 12V storage + solar energy); power consumption <5W.
[0038] Specifically, the microcontroller is an STM32 series or equivalent MCU, and the communication interface can be RS485, 4G, NB-IoT or Wi-Fi. For example, the microcontroller is an STM32F407 MCU with 4 analog inputs, 3 digital pulse inputs, 1 temperature sensor input, built-in RTC and MicroSD card, and the communication module is NB-IoT.
[0039] The control module is used to receive the rotation speed data from the detection unit and the liquid level data from the liquid level sensor, and to perform filtering, calibration, calculation and reporting functions.
[0040] The specific calculation process is as follows:
[0041] (1) Measure the water depth h (in meters) by the liquid level sensor 300, and calculate the wetted perimeter cross-sectional area A (h) of the water in the circular cross-section from the pipe inner diameter D (known or input);
[0042] The calculation of the wetted perimeter cross-sectional area A(h) is as follows:
[0043] Given the inner radius of the pipe R = D / 2, the water depth h (0 ≤ h ≤ 2R), let the height of the submerged section a = h, and the wetted area A(h) (circular arc-triangle formula):
[0044] ;
[0045] (2) Local velocity estimates v1, v2, v3 (unit m / s) are obtained by the three propellers respectively. These velocities correspond to different vertical positions y1, y2, y3 (calculated from the bottom of the tube).
[0046] Specifically, based on the calibration experiments, a linear or quadratic fitting model is established for each propeller i:
[0047] ;
[0048] or
[0049] ;
[0050] where, v i represents the local flow velocity (m / s), k i represents the slope of the linear model, b i represents the linear term coefficient (for quadratic fitting), c i represents the constant term (for quadratic fitting), n i is the propeller rotational speed (rps or rpm converted to Hz), and the coefficients k i , b i , c i are determined through calibration (factory or on-site). It is recommended to preferably use a linear or first-order lag model for real-time calculation and stability.
[0051] (3) Estimate the overall flow velocity distribution based on the liquid level and the three-point velocity distribution and calculate the corresponding volumetric flow rate Q:
[0052] Q = A(h) * v;
[0053] v is the average velocity of the wet area (obtained by weighting the three-point velocities or curve fitting).
[0054] (4) Estimation of the vertical velocity distribution and the average velocity
[0055] If the flow field in the pipe is approximately axisymmetric (full pipe), the three-point velocity weighted average can be used:
[0056] ;
[0057] The weight w i can be set according to the proportion of the measurement points or the fitting results (such as the Simpson 3-point method or the weight according to the vertical position distance from the center). A commonly used simple weight is: w1 = 0.2, w2 = 0.6, w3 = 0.2.
[0058] For partial filling (h < R or h close to 0), the upper part may be air. When the upper measurement points fail, effective measurement points should be weighted or interpolated and idle points should be automatically de-weighted (when air or abnormal rotational speed is detected at that point). The system determines which propellers are in the water through the liquid level h: only use the points in the water and re-normalize the weights according to their relative depths.
[0059] (5) Final volumetric flow rate: .
[0060] After that, the calculated final volumetric flow rate Q is reported through the communication interface, and the amount of the liquid medicine is adjusted according to the measured final volumetric flow rate Q.
[0061] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A tap pipeline propeller liquid level coupling flow rate detection device, characterized in that: The utility model provides an installation adjusting part (100) is inserted into the inside of tap pipeline through pipeline manhole, at least two propeller modules (200) are arranged longitudinally on the installation adjusting part (100), and the detachable connection between propeller module (200) and installation adjusting part (100), at least two propeller modules (200) are all provided with detection unit for propeller rotating speed detection, liquid level sensor (300) is detachably installed in the front of the most top propeller module (200) on installation adjusting part (100), Further comprising a control module, the output end of the detection unit and liquid level sensor (300) is electrically connected with the input end of the control module.
2. The tap water pipe propeller level coupling flow rate detection device according to claim 1, characterized in that: The detection unit is the rotor of propeller module (200), and at least one of magnetic encoder, optical encoder and hall sensor is installed on the rotor.
3. The tap water pipe propeller level coupling flow rate detection device according to claim 1, characterized in that: The installation adjusting part (100) is telescopic mounting rod or guide rail for adjusting the setting position of propeller module (200) in the inside of tap pipeline.
4. The tap water pipe propeller level coupling flow rate detection device according to claim 1, characterized in that: The control module comprises microcontroller, A / D module, input filter module, storage module, communication interface and driving power supply; The output end of the detection unit and liquid level sensor (300) is electrically connected with the input end of the input filter module, the output end of the input filter module is electrically connected with the input end of the A / D module, and the output end of the A / D module is electrically connected with the input end of the microcontroller; The output end of the microcontroller is electrically connected with the storage module and communication interface; The driving power supply provides electric energy for the detection device.
5. The tap water pipe propeller level coupling flow rate detection device according to claim 1, characterized by: The turbulence piece (400) is composed of several guide vanes or hollow blades.
6. The tap water pipe propeller level coupling flow rate detection device according to claim 5, characterized in that: At least one of detachable protective cover, cleaning brush, sampling port and flushing interface is arranged outside the propeller.
7. The tap water pipe propeller level coupling flow rate detection device according to claim 1, characterized by: