Hydrodynamic simulation and measurement device for sewage pipe blockage and method for measuring blockage state

Abstract

This invention relates to the field of non-full-flow pipe measurement technology, and provides a hydrodynamic simulation measurement device and method for measuring the siltation state of sewage pipes. The device includes an upstream shaft, a downstream water tank, an experimental pipe, a return water pipe, an inlet water pipe, a feeder, and a camera. The upstream shaft is located at the upper end of the experimental pipe, and the downstream water tank is located at the end outlet of the experimental pipe. An observation camera is installed above the experimental pipe, and a slope adjustment device is installed below it. The feeder is located near the upstream shaft on the experimental pipe. The return water pipe is connected to the upstream shaft and the downstream water tank. This invention utilizes a semi-open channel as the experimental pipe for studying non-full-flow conditions, and uses a camera to record the entire process of siltation changes within the pipe. Image recognition technology is used to convert the collected video information into feature data, thus avoiding the limitations of traditional acrylic pipe experiments where the internal state is only observed through the side glass.

Description

Technical Field

[0001] This invention relates to the field of non-full-flow pipeline measurement technology, and in particular to a hydrodynamic simulation and measurement device for sewage pipeline blockage and a method for measuring blockage status. Background Technology

[0002] Urban wastewater systems are vital urban infrastructure for maintaining the urban water environment and preventing the spread of diseases, playing a crucial role in safeguarding urban public health and ecological well-being. Pipeline blockage is a common problem in urban wastewater systems, significantly reducing drainage capacity, causing sewage well blowouts, and leading to pipe corrosion and the generation of harmful gases, resulting in air pollution and endangering the safety of underground workers. Therefore, wastewater pipeline blockage seriously affects the urban environment and threatens public safety, urgently requiring a solution.

[0003] The causes of sewage pipe blockage are highly complex. When sewage containing high concentrations of pollutants enters the pipes, suspended solids tend to deposit during low flow velocities and are then scourdled during high flow velocities. The resulting blockage also influences the pipe's hydrodynamic processes, creating complex hydraulic phenomena such as backwater, weir flow, and localized pressurized flow, which further affect the development of blockage. The feedback mechanism between sewage pipe blockage and hydrodynamic processes is extremely complex, and its study is crucial for solving sewage pipe blockage problems and represents a significant challenge in the field of sewage pipe network research.

[0004] In recent years, some studies have focused on the hydraulic conditions leading to sewage pipe blockage. However, these studies primarily explore the migration characteristics of particulate matter within pipes through experimental observations or numerical simulations, lacking an understanding of the interaction mechanism between blockage and hydrodynamics (including the formation and development of blockage and the hydrodynamic effects on the pipe after blockage formation). Although research on the interaction between blockage sediments and the fluid within water supply pipes has been conducted, water supply pipes are full-pipe pressurized flow environments with often high velocities, while sewage pipes are typically low-velocity, unpressurized flow environments. Furthermore, the concentration, compositional complexity, and particle size of pollutants in water supply pipes are significantly lower than in sewage pipes, making direct application to the hydrodynamic research of sewage pipe blockage impossible. Moreover, most current sewage pipe blockage studies use sand with different particle sizes as the medium in their experimental setups. However, the sediments in real sewage pipes are mainly a mixture of inorganic suspended particulate matter from surface runoff and organic pollutants from domestic sewage, and their physical characteristics (such as density, surface smoothness, viscosity, and settling rate) differ significantly from those of sand. Another drawback of existing research and experimental setups is that they often use PVC or glass to construct pipes for observation, while real sewage pipes are typically made of materials such as concrete and high-density polyethylene, whose roughness coefficients differ significantly from those of commonly used experimental pipe materials. Therefore, the relevant theories, models, and formulas established based on current experimental setups cannot be directly applied to the study of siltation problems in real urban sewage pipes. Summary of the Invention

[0005] To address the above problems, the present invention provides the following technical solution:

[0006] This invention provides a hydrodynamic simulation and measurement device for sewage pipe blockage, including an upstream vertical shaft, a downstream water tank, an experimental pipe, a return water pipe, an inlet water pipe, a feeder, and a camera;

[0007] The inlet pipe and the downstream pool are used to provide the initial water source. The upstream shaft is located at the upper end of the experimental pipe, and the downstream pool is located at the end outlet of the experimental pipe.

[0008] An observation camera is installed above the experimental pipe to observe the blockage under different non-full flow conditions inside the experimental pipe.

[0009] There is a water level difference between the inlet and outlet of the experimental pipe, and a slope adjustment device is provided below the experimental pipe to adjust the slope of the experimental pipe.

[0010] The feeding machine is located near the upstream vertical shaft of the experimental pipeline and is used to add sediment into the experimental pipeline.

[0011] The return water pipe is used to regulate the upstream and downstream water levels and realize water circulation. The return water pipe is connected to the upstream vertical shaft and the downstream water tank. A flow pump is installed in the return water pipe to transport water from the downstream water tank to the upstream vertical shaft.

[0012] The water inlet pipe is connected to the downstream water tank, and the inlet of the water inlet pipe is also equipped with an inlet valve to control the water inlet speed.

[0013] Furthermore, the experimental conduit is a circular semi-pipe open channel with a rough inner wall.

[0014] Furthermore, the roughness coefficient of the experimental pipe is approximately 0.014.

[0015] Furthermore, the return water pipe is also equipped with a return water valve to control the pumping speed of the flow pump and the water flow rate in the experimental pipe.

[0016] Both the return water pipe and the inlet water pipe are equipped with real-time flow meters.

[0017] The outlet of the return water pipe connected to the upstream shaft is equipped with a flow stabilizer plate, which is cross-shaped and used to reduce the impact effect of incoming water, avoid drastic fluctuations in the water level of the upstream shaft, and maintain a relatively stable water level in the upstream shaft.

[0018] Furthermore, a filter screen capable of filtering silt is provided at the connection between the downstream water tank and the return water pipe.

[0019] Furthermore, a wave meter is installed inside the experimental pipe to measure the water level inside the pipe.

[0020] Furthermore, the slope adjustment device includes a support frame and a variable slope jack. The support frame is located below the experimental pipe and is used to support the experimental pipe and assist in adjusting the slope of the experimental pipe. The variable slope jack is located below the support frame and is used to adjust the inclination slope of the support frame and the experimental pipe.

[0021] The present invention also provides a method for measuring the siltation state of sewage pipes, the method being based on the aforementioned simulation measuring device, and the method comprising:

[0022] (1) Open the inlet valve to store water in the downstream pool:

[0023] Turn off the flow pump and return valve on the return water pipe, open the inlet valve to allow external water to enter the downstream water tank and fill the water to the elevation line, then close the inlet valve.

[0024] (2) Adjust the slope of the experimental pipeline:

[0025] Keep the return water valve and the inlet water valve closed. Adjust the slope changing device to slowly tilt the experimental pipe from a horizontal state to the specified slope. After confirming that the slope meets the requirements with a protractor, fix the experimental pipe to the slope changing device to keep the slope stable.

[0026] (3) Connect the upstream shaft and the downstream pool, and set the water level in the experimental pipeline:

[0027] Turn on the flow pump and return water valve to connect the upstream shaft and the downstream pool. After water flows in the experimental pipeline and the water level stops changing, adjust the return water valve to control the water level difference between the upstream and downstream, thereby controlling the water level in the experimental pipeline to stabilize at the required level for the experiment, so as to ensure that the flow rate in the experimental pipeline meets the experimental requirements.

[0028] (4) Start the feeding machine to discharge materials:

[0029] Add sediment samples to the feeder, adjust the feeder speed to meet the experimental requirements, turn on the feeder so that the sediment samples fall evenly into the experimental pipe and are washed by the water flow in the pipe;

[0030] (5) Turn on the camera to record and measure the changes in the blockage state inside the pipe:

[0031] The camera was turned on to continuously record video images of the sediment migration process in the experimental pipe. The shape, size, and thickness parameters of the sediment in the video data were measured using image recognition technology.

[0032] Furthermore, the specific steps for measuring the characteristics of sediments inside the pipe in step (5) are as follows:

[0033] (51) Extract the video recorded by the camera frame by frame, in image format;

[0034] (52) Obtain the areas of sediment in the extracted video images using computer image analysis technology and mark them with a uniform color;

[0035] (53) Identify the marked sediment areas using computer image analysis technology, and determine and statistically analyze their outline positions and shapes;

[0036] (54) Calculate the length, width, area, shape and other characteristic parameters of the sediments that have been identified statistically;

[0037] (55) The obtained sediment profile feature data are calibrated, checked and summarized to achieve accurate measurement of the siltation development process in the pipe under rough pipe wall environment.

[0038] The present invention has the following beneficial effects:

[0039] (1) The present invention adopts the method of grinding the inner wall of the pipe to make it close to the roughness of the inner wall of the actual sewage pipe. This effectively avoids the problems of large mass, difficulty in adjusting position and slope, and difficulty in observation caused by the use of real sewage pipes (mostly made of concrete) in the experiment. At the same time, it ensures the advantage that the environment inside the pipe is similar to that of the real sewage pipe, and avoids the problems of excessive smoothness and large error between experimental results and reality caused by the use of plexiglass pipes in traditional equipment.

[0040] (2) The present invention adopts a novel method for measuring the characteristics of sediment in sewage pipes. By using a half-pipe open channel as an experimental pipe for studying non-full pipe flow, a camera mounted on the top is used to record the entire process of siltation changes in the pipe. The collected video information is converted into feature data through image recognition technology. This method for measuring siltation characteristics solves the defect that conventional CCTV measurement methods can only record the siltation state in the pipe at a single moment, and avoids the defect that traditional plexiglass pipe experiments can only observe the state inside the pipe through the side glass and cannot be applied to real rough pipe environments.

[0041] (3) This invention enables accurate observation of the complete growth process of siltation in a simulated pipeline environment, and has high research and application value. Attached Figure Description

[0042] Figure 1 This is a top view of the overall structure of Example 1.

[0043] Figure 2 This is a front view schematic diagram of the overall structure of Embodiment 1.

[0044] Figure 3 This is a side view of the overall structure of Embodiment 1.

[0045] Figure 4 This is a schematic diagram of the video shooting observation area in Example 1.

[0046] Figure 5 This is a schematic diagram of the opening and closing of the water inlet valve and the flow direction under the water storage condition in Example 2.

[0047] Figure 6 This is a schematic diagram of adjusting the slope of the experimental pipeline in Example 2.

[0048] Figure 7 This is a schematic diagram of the opening and closing of the inlet valve and the flow direction under the condition of setting upstream and downstream water levels in Example 2.

[0049] Figure 8 This is a schematic diagram of the opening and closing of the system device and the flow direction when feeding is started and siltation is observed in Example 2.

[0050] Figure 9This is a flowchart of the method for activating a camera to record and measure the characteristics of sediments inside the pipe in Example 2. Detailed Implementation

[0051] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments are only specific illustrations of the invention and should not be regarded as limitations on the invention. The purpose of the embodiments is to enable those skilled in the art to better understand and reproduce the technical solution of the present invention. The scope of protection of the present invention should still be determined by the scope defined in the claims.

[0052] Example 1, refer to Appendix Figure 1-4 .

[0053] This embodiment provides a hydrodynamic simulation and measurement device for sewage pipe blockage, including an upstream vertical shaft 1, a downstream water tank 2, an experimental pipe 3, a return water pipe 4, an inlet water pipe 5, a feeder 13, and a camera;

[0054] The inlet pipe 5 and the downstream pool 2 are used to provide the initial water source. The upstream shaft 1 is located at the upper end of the experimental pipe 3, and the downstream pool 2 is located at the end outlet of the experimental pipe 3. The inlet pipe 5 is connected to the downstream pool 2, and the inlet pipe 5 is also equipped with an inlet valve 6 to control the water inlet speed.

[0055] An observation camera is installed above the experimental pipe 3 to observe the blockage under different non-full pipe flow conditions inside the experimental pipe 3.

[0056] There is a water level difference between the inlet and outlet of the experimental pipe 3. A slope adjustment device is provided below the experimental pipe 3 to adjust the slope of the experimental pipe. The slope adjustment device includes a support frame 11 and a variable slope jack 12. The support frame 11 is located below the experimental pipe 3 to support the experimental pipe 3 and assist in adjusting the slope of the experimental pipe 3. The variable slope jack 12 is located below the support frame and is used to adjust the inclination slope of the support frame 11 and the experimental pipe 3.

[0057] The experimental pipe 3 is a circular semi-pipe open channel with a rough inner wall. The roughness coefficient of the experimental pipe 3 is approximately 0.014. A wave meter 10 is installed inside the experimental pipe 3 to measure the water level height inside the experimental pipe 3.

[0058] The feeding machine 13 is located near the experimental pipe 3 of the upstream vertical shaft 1 and is used to add sediment to the experimental pipe 3.

[0059] The return water pipe 4 is used to regulate the upstream and downstream water levels and achieve water circulation. The return water pipe 4 is connected to the upstream vertical shaft 1 and the downstream water tank 2. A flow pump 7 is installed in the return water pipe 4 to transport water from the downstream water tank 2 to the upstream vertical shaft 1. Real-time flow meters are installed in both the return water pipe 4 and the inlet water pipe 5. The return water pipe 4 is also equipped with a return water valve 8 and a real-time flow meter to control the pumping rate of the flow pump 7 and the water flow rate in the experimental pipe 3.

[0060] The outlet of the return water pipe 4, which connects to the upstream vertical shaft 1, is equipped with a flow stabilizing plate 9. The flow stabilizing plate 9 is cross-shaped and is used to reduce the impact effect of incoming water, prevent drastic fluctuations in the water level of the upstream vertical shaft 1, and maintain a relatively stable water level in the upstream vertical shaft 1. A filter screen for filtering sediment is installed at the connection between the downstream water tank 2 and the return water pipe 4.

[0061] Example 2

[0062] This embodiment provides a method for measuring the blockage status of sewage pipes. The measurement method is based on the aforementioned simulation measurement device and includes:

[0063] S1, open the inlet valve 6 to store water in the downstream pool 2:

[0064] like Figure 5 As shown, close the flow pump 7 and return valve 8 on the return water pipe, open the inlet valve 6 to allow external water to enter the downstream pool and fill the water to the elevation line, then close the inlet valve 6.

[0065] S2, Adjust the slope of experimental pipe 3:

[0066] like Figure 6 As shown, keep the return water valve 8 and the inlet water valve 6 closed, adjust the slope changing device to slowly tilt the experimental pipe 3 from a horizontal state to the specified slope, and after confirming that the slope meets the requirements by using a protractor, fix the experimental pipe 3 to the slope changing device to keep the slope stable.

[0067] S3 connects the upstream vertical shaft 1 and the downstream water tank 2, and sets the water level of the experimental pipe 3:

[0068] like Figure 7 As shown, open the flow pump 7 and the return water valve 8 to connect the upstream shaft 1 and the downstream water tank 2. After water flows in the experimental pipe 3 and the water level no longer changes, adjust the return water valve 8 to control the water level difference between the upstream and downstream, thereby controlling the water level in the experimental pipe 3 to stabilize at the required water level for the experiment, so as to ensure that the flow rate in the experimental pipe 3 meets the experimental requirements.

[0069] S4, start feeding machine 13 to discharge material:

[0070] like Figure 8As shown, a sediment sample is added to the feeder 13, the speed of the feeder 13 is adjusted to meet the experimental requirements, and the feeder 13 is turned on so that the sediment sample falls evenly into the experimental pipe and is washed by the water flow in the pipe.

[0071] S5, turn on the camera to record and measure the changes in the blockage state inside the pipe:

[0072] The camera was turned on to continuously record video images of the sediment migration process in the experimental pipe. The shape, size, and thickness parameters of the sediment in the video data were measured using image recognition technology.

[0073] like Figure 9 As shown, the specific steps for measuring the characteristics of sediments inside the pipe in step S5 are as follows:

[0074] S51 extracts the video recorded by the camera frame by frame, in image format;

[0075] S52, using computer image analysis technology, obtains the areas of sediment in the extracted video images and marks them with a uniform color;

[0076] S53 uses computer image analysis technology to identify the marked sediment areas, determine and statistically analyze their outline positions and shapes;

[0077] S54. Based on the statistically identified sediment profiles, calculate their characteristic parameters such as length, width, area, and shape.

[0078] S55 calibrates and summarizes the obtained sediment profile feature data to achieve accurate measurement of the pipe blockage development process under rough pipe wall environment.

[0079] This invention addresses the shortcomings of existing technologies by innovatively combining the advantages of full-pipe flowmeters and steady-state methods to achieve accurate flow measurement even in non-full-flow conditions. The experimental pipeline is equipped with a wave height meter, and a flow stabilizer is located in the upstream shaft at the inlet of the inlet pipe within the upstream shaft. An inlet pipe connected to the downstream water tank is equipped with a valve. A filter baffle is installed in the downstream water tank. This invention, addressing the shortcomings of existing technologies, provides a device and method for simulating and measuring the hydrodynamics of sewage pipe blockage, innovatively achieving accurate measurement of the blockage development process within pipes under rough pipe wall conditions.

[0080] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0081] It should be noted that any technical features not described in detail in this invention can be implemented using any existing technology.

Claims

1. A hydrodynamic simulation and measurement device for sewage pipe blockage, characterized in that, This includes an upstream shaft, a downstream pool, experimental pipes, a return water pipe, an inlet water pipe, a feeding machine, and a camera; The inlet pipe and the downstream pool are used to provide the initial water source. The upstream shaft is located at the upper end of the experimental pipe, and the downstream pool is located at the end outlet of the experimental pipe. An observation camera is installed above the experimental pipe to observe the blockage under different non-full flow conditions inside the experimental pipe. The experimental pipe is equipped with a slope adjustment device at the bottom to adjust the slope of the experimental pipe. The feeding machine is located near the upstream vertical shaft of the experimental pipe and is used to add sediment to the experimental pipe. When the feeding machine is turned on, the sediment sample falls evenly into the experimental pipe and is washed by the water flow in the pipe. The return water pipe is used to regulate the upstream and downstream water levels and realize water circulation. The return water pipe is connected to the upstream vertical shaft and the downstream water tank. A flow pump is installed in the return water pipe to transport water from the downstream water tank to the upstream vertical shaft. The inlet pipe is connected to the downstream water tank, and an inlet valve is installed at the inlet of the inlet pipe to control the inlet speed.

2. The sewage pipe blockage hydrodynamic simulation and measurement device according to claim 1, characterized in that, The experimental pipeline is a circular semi-pipe open channel with a rough inner wall.

3. The sewage pipe blockage hydrodynamic simulation and measurement device according to claim 1, characterized in that, The roughness coefficient of the experimental pipe is 0.

014.

4. The sewage pipe blockage hydrodynamic simulation and measurement device according to claim 1, characterized in that, The return water pipe is also equipped with a return water valve to control the pumping speed of the flow pump and the water flow rate in the experimental pipe.

5. The sewage pipe blockage hydrodynamic simulation and measurement device according to claim 1, characterized in that, The outlet of the return water pipe connected to the upstream shaft is equipped with a flow stabilizer plate to reduce the impact effect of incoming water, avoid drastic fluctuations in the water level of the upstream shaft, and maintain a relatively stable water level in the upstream shaft.

6. The sewage pipe blockage hydrodynamic simulation and measurement device according to claim 1, characterized in that, The downstream water tank is equipped with a filter screen at the connection point with the return water pipe to filter out silt and sand.

7. The sewage pipe blockage hydrodynamic simulation and measurement device according to claim 1, characterized in that, The experimental pipeline is equipped with a wave meter to measure the water level inside the pipeline.

8. The sewage pipe blockage hydrodynamic simulation and measurement device according to claim 1, characterized in that, The slope adjustment device includes a support frame and a variable slope jack. The support frame is located below the experimental pipe and is used to support the experimental pipe and assist in adjusting the slope of the experimental pipe. The variable slope jack is located below the support frame and is used to adjust the inclination slope of the support frame and the experimental pipe.

9. A method for measuring the siltation status of sewage pipes, characterized in that, The measurement method is based on the analog measurement device according to any one of claims 1-8, and the measurement method includes: (1) Open the inlet valve to store water in the downstream pool: Turn off the flow pump and return valve on the return water pipe, open the inlet valve to allow external water to enter the downstream water tank and fill the water to the elevation line, then close the inlet valve. (2) Adjust the slope of the experimental pipeline: Keep the return water valve and the inlet water valve closed. Adjust the slope changing device to slowly tilt the experimental pipe from a horizontal state to the specified slope. After confirming that the slope meets the requirements with a protractor, fix the experimental pipe to the slope changing device to keep the slope stable. (3) Connect the upstream shaft and the downstream pool, and set the water level in the experimental pipeline: Turn on the flow pump and return water valve to connect the upstream shaft and the downstream pool. After water flows in the experimental pipeline and the water level stops changing, adjust the return water valve to control the water level difference between the upstream and downstream, thereby controlling the water level in the experimental pipeline to stabilize at the required level for the experiment, so as to ensure that the flow rate in the experimental pipeline meets the experimental requirements. (4) Start the feeding machine to discharge materials: Add sediment samples to the feeder, adjust the feeder speed to meet the experimental requirements, turn on the feeder so that the sediment samples fall evenly into the experimental pipe and are washed by the water flow in the pipe; (5) Turn on the camera to record and measure the changes in the blockage state inside the pipe: The camera was turned on to continuously record video images of the sediment migration process in the experimental pipe. The shape, size, and thickness parameters of the sediment in the video data were measured using image recognition technology.

10. A method for measuring the siltation state of a sewage pipe according to claim 9, characterized in that, The specific steps for measuring the characteristics of sediments inside the pipe in step (5) are as follows: (51) Extract the video recorded by the camera frame by frame, in image format; (52) Obtain the areas of sediment in the extracted video images using computer image analysis technology and mark them with a uniform color; (53) Identify the marked sediment areas using computer image analysis technology, and determine and statistically analyze their outline positions and shapes; (54) Calculate the length, width, area, and shape characteristics of the sediments based on the identified sediment profiles. (55) The obtained sediment profile feature data are calibrated, checked and summarized to achieve accurate measurement of the siltation development process in the pipe under rough pipe wall environment.

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