Sediment transportation phenomenon and deposition simulation experiment device for pressure sewage pipeline

Abstract

The utility model discloses a sediment transportation phenomenon and deposition simulation experiment device for a pressure sewage pipeline. The sediment transportation phenomenon and deposition simulation experiment device comprises an organic glass tube, a bracket, a sand adding funnel, a spiral conveyer, a stirrer, a water inlet tank, a water outlet tank and the like, according to the device, the organic glass tubes are connected through the flanges to form the sewage pipelines, the sewage pipelines are placed on the supports with different heights, inflection points are connected through the PVC hose connectors, and the requirements of connectors with different angles are met. The sand adding funnel adds sand into the water inlet tank through the spiral conveyor, and the sand adding speed is adjusted by controlling the frequency converter. The water outlet tank is preliminarily filtered by the overflow plate, the silt is further settled by the desilting open channel, the water return pump returns clear water of the desilting open channel to the water inlet tank through the water return pipe to realize circulation, and silt transportation and deposition of the pressure sewage pipeline are effectively simulated.

Description

Technical Field

[0001] This utility model relates to the field of pipeline experimental simulation technology, specifically to an experimental device for simulating the phenomenon and sedimentation of silt transport in pressurized sewage pipelines. Background Technology

[0002] Currently, many cities' sewage pipe networks are facing a serious problem of large-scale accumulation of sediments such as silt inside the pipes. These sediments come from a variety of sources. On the one hand, urban surface runoff carries a large amount of silt, dust, and various solid impurities when it flows into the sewage pipe network; on the other hand, some old sewage pipe networks, due to a lack of effective maintenance and cleaning, have damaged internal structures, causing silt and other substances from the surrounding soil to enter the pipes.

[0003] The long-term accumulation of sediment in sewage pipes leads to a series of serious consequences. Firstly, sediment often contains various corrosive substances. These substances, in prolonged contact with the pipe's inner wall, corrode the pipe material, accelerating aging and damage, and shortening its lifespan. Secondly, the continuous accumulation of sediment occupies the effective cross-sectional area of ​​the pipe, reducing the actual water transport area and thus lowering the system's carrying capacity. This not only slows the flow of sewage within the pipes, easily causing sewage stagnation and the proliferation of bacteria and harmful microorganisms, but also, under extreme weather conditions such as heavy rain, can lead to sewage overflows, causing urban flooding and severely disrupting the normal operation of the city and disrupting residents' lives.

[0004] Given the aforementioned problems, in-depth research into the sediment transport and deposition processes within sewage pipelines is particularly urgent. However, most devices, when treating sewage containing sediment, cannot guarantee stable system circulation under a fixed input sediment concentration. This not only wastes water resources but may also lead to pipe blockages and equipment damage due to sediment accumulation, increasing maintenance costs and operational risks. Furthermore, existing technologies also have many shortcomings in simulating sediment transport and deposition phenomena in actual sewage networks. They cannot precisely control the sediment addition rate and cannot flexibly simulate operating conditions with different flow velocities and sediment concentrations. Therefore, an experimental device is urgently needed to explore the influence of different flow conditions, sediment characteristics, and pipeline parameters on sediment transport and deposition, thereby providing scientific basis and technical support for the optimized design, daily maintenance, and dredging scheme development of urban sewage networks. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide an experimental device for simulating the phenomenon and deposition of silt transport in pressurized sewage pipelines. This device is intended to verify the deposition of silt in actual engineering projects and to reconstruct the in-situ conditions of sewage pipelines, as well as to study the morphology of silt movement and critical flow velocity in academic research. It also provides support for the study of silt transport processes and silt deposition analysis in specific engineering projects and academic theories.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An experimental device for simulating the silt transport and sedimentation phenomena in pressurized sewage pipelines includes a sewage pipeline composed of several plexiglass tubes connected by flanges in sequence. The sewage pipeline is placed on several supports of varying heights, with the placement height of the sewage pipeline determined based on the actual simulated engineering project. The device also includes a sand-adding funnel, a screw conveyor, a stirrer, an inlet tank, an inlet pump, a return pump, an outlet tank, a return pipe, a sedimentation channel, a frequency converter, and a control cabinet. One end of the sewage pipeline is connected to the inlet tank, and the other end is connected to the outlet tank. A stirrer is installed inside the inlet tank. The outlet of the sand-adding funnel is connected to the inlet of the screw conveyor, and the outlet of the screw conveyor is located above the inlet tank. The screw conveyor is connected to the frequency converter, and an inlet pump is installed at the connection between the inlet tank and the sewage pipeline.

[0008] The outlet tank is provided with an overflow port on one side to overflow into the sedimentation channel. The sedimentation channel is connected to one end of the return water pipe and a return water pump is provided at the connection point. The other end of the return water pipe is connected to the inlet tank. The inlet pump and the return water pump are respectively connected to the control cabinet.

[0009] As a further preferred embodiment, an electromagnetic flow meter is installed inside the sewage pipe, and the electromagnetic flow meter is located 2m away from the inlet pump.

[0010] As a further preferred embodiment, the sewage pipe is equipped with several pressure transmitters located at both ends of a specific plexiglass tube to be tested.

[0011] As a further preferred embodiment, both ends of the sewage pipe are equipped with PVC butterfly valves.

[0012] As a further preferred embodiment, an air vent valve is provided at the highest point of the sewage pipe.

[0013] As a further preferred embodiment, drain pipes are provided at the bottom of the water inlet tank, the lowest point of the sedimentation channel, and the lowest point of the sewage pipe, and manual valves are provided at the outlets of the drain pipes.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This utility model, by setting up a sedimentation channel, a return water pump and a return water pipe, enables the sediment in the water discharged from the water storage tank to settle fully, realize the reuse of clean water, and ensure that the system can operate stably under a fixed input sediment concentration.

[0016] 2. A screw conveyor is installed between the water inlet tank and the sand addition funnel. The conveying speed of the screw conveyor can be precisely controlled by a frequency converter, thereby controlling the sand addition rate. Simultaneously, the power of the water inlet pump can be flexibly adjusted using the control cabinet to simulate different flow rates and sediment concentrations.

[0017] 3. This invention can highly replicate the transport process and sedimentation phenomenon in actual sewage pipe networks. It can not only study the system's operation under different flow velocities, explore the impact of sediment of different particle sizes on the system, and observe the movement patterns of sediment under different operating conditions; it can also flexibly adjust the layout of sewage pipelines according to actual needs, conducting targeted research for different projects. Furthermore, this invention can also be used to study the critical non-silting flow velocity under different particle sizes and concentrations. Its operation is simple, enabling precise control of one or more variables, providing practical construction schemes and operational suggestions for actual engineering applications. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] The components include: 1. Acrylic glass tube; 2. Support frame; 3. Sand funnel; 4. Screw conveyor; 5. Agitator; 6. Inlet tank; 7. PVC hose; 8. Outlet tank; 9. PVC butterfly valve; 10. Inlet pump; 11. Return pump; 12. Sedimentation channel; 13. Return pipe; 14. Air vent valve. Detailed Implementation

[0020] 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.

[0021] like Figure 1As shown, the present invention provides a pressurized sewage pipeline sludge transport phenomenon and sedimentation simulation experimental device, which includes a sewage pipeline composed of several plexiglass tubes 1 connected by flanges in sequence. The sewage pipeline is placed on several supports 2, and the heights of the supports (2) are different. It should be noted that when the experimental site is not large enough, inflection points need to be set on the sewage pipeline. The inflection points of the sewage pipeline are connected by PVC hose 7 connectors. The inner wall of this connector is relatively smooth and has a large bending angle, which can effectively meet the different angle interface requirements in the physical model. The placement height of each plexiglass tube 1 is determined according to the actual simulated project. For the actual project, the whole pipeline can be designed by combining the overall abnormal design and the local abnormal design.

[0022] Furthermore, one end of the sewage pipe is connected to the inlet tank 6, and the other end is connected to the outlet tank 8. The inlet tank 6 is equipped with a stirrer 5. The outlet of the sand adding funnel 3 is connected to the inlet of the screw conveyor 4. The outlet of the screw conveyor 4 is located above the inlet tank 6. The screw conveyor 4 is connected to a control frequency converter. The power of the screw conveyor 4 is controlled by the control frequency converter to adjust the sand adding rate and control the concentration of silt in the sewage pipe. The stirrer 5 is used to fully stir the silt. An inlet pump 10 is installed at the connection between the inlet tank 6 and the sewage pipe.

[0023] Furthermore, an overflow port is vertically installed on one side of the outlet tank 8 to achieve preliminary filtration of sediment in the discharged water through overflow. The outlet of the overflow plate is connected to the sedimentation channel 12 to achieve further sedimentation of sediment and ensure that the return water is clean water. The sedimentation channel 12 is connected to one end of the return water pipe 13 and a return water pump 11 is installed at the connection. The other end of the return water pipe 13 is connected to the inlet tank 6 to realize the circulation operation of the device. The inlet pump 10 and the return water pump 11 are respectively connected to the control cabinet. The control cabinet controls the flow rate of the sewage pipe by controlling the power of the inlet pump 10 and the return water pump 11.

[0024] Furthermore, an electromagnetic flow meter is installed inside the sewage pipe, located 2m away from the inlet pump.

[0025] Furthermore, several pressure transmitters are installed inside the sewage pipe to measure the resistance coefficient of the pipe. When it is necessary to test the resistance coefficient of a certain section of plexiglass tube 1, the pressure transmitters are installed at both ends of the plexiglass tube 1 to be tested.

[0026] Furthermore, PVC butterfly valves 9 are installed at both ends of the sewage pipe. The front end is for maintenance of the inlet tank 6 and the inlet pump 10, and the end end is for closing the valve to release air from the pipe when the water flow in the pipe is not full.

[0027] Furthermore, two vent valves 14 are installed at the highest point of the sewage pipeline where a vacuum is likely to be generated, to ensure the initial water filling and venting requirements of the sewage pipeline during operation, so that the pipeline can operate at full capacity.

[0028] Furthermore, drain pipes are provided at the bottom of the water inlet tank 6, the lowest point of the sedimentation channel 12, and the lowest point of the pipeline. The outlet of each drain pipe is equipped with a manual valve to discharge the experimental wastewater from the device.

[0029] The operation process of this utility model is as follows:

[0030] 1. Initial state: All equipment is off, pipelines are emptied, and manual valves are closed.

[0031] 2. Experimental Platform Start-up: First, fill the sedimentation channel 12 with clean water to a high level, and add sufficient sediment particles to the sand-adding funnel 3. Start the return water pump 11 to a high flow rate to allow water in the sedimentation channel 12 to flow into the inlet tank 6, maintaining the high water level in the sedimentation channel 12. Then, slowly start the inlet pump 10 via the PVC butterfly valve 9 at the front end of the sewage pipeline to fill the pipeline with water until it is full. At the same time, adjust the frequency of the inlet pump 10 to ensure the flow rate in the sewage pipeline meets the design requirements. Continue to maintain the high water level in the open channel to achieve stable circulation of clean water. Finally, start the agitator 5 and the screw conveyor 4. Adjust the frequency of the screw conveyor 4 using the frequency converter to achieve the sand-adding rate meets the design requirements, allowing water with the set sediment concentration to be transported from the inlet tank 6 to the sewage pipeline for observation of sediment transport and deposition phenomena. Unsettled sediment particles in the sewage pipes will further settle in the end outlet tank 8 and sedimentation channel 12, and finally the clean water will be transported to the inlet tank 6 by the return water pump 11 for recycling.

[0032] 3. Experimental Condition Adjustment: During the operation of the experimental platform, if adjustments to the experimental conditions (such as flow rate, sediment concentration, etc.) are required, the operating frequencies of the inlet pump 10, screw conveyor 4, and return pump 11 can be adjusted according to the operating conditions to meet the set requirements. For each experimental condition simulation, the start time is the time of sand addition, and experimental phenomena are recorded at half-hour intervals. The focus is on observing the morphology and thickness of sediment accumulation at different locations in the pipeline. When the observed phenomena remain essentially unchanged between two observations, the system can be considered to have reached a stable state, at which point the sediment deposition experiment ends.

[0033] 4. Experimental Platform Shutdown: After the experiment, first stop the screw conveyor 4 (stop adding sand), and increase the frequency of the inlet pump 10 to increase the flow rate in the pipes to flush the sewage pipes. After all the sediment in the sewage pipes has been discharged into the sedimentation channel 12, stop the inlet pump 10, return pump 11, and agitator 5. Drain the water through the drain outlets located at the bottom of the sedimentation channel 12, the inlet tank 6, and the lowest point of the pipes. After the water has been drained, clean the sedimentation channel 12 to remove the sediment.

[0034] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A kind of pressure sewer pipe sediment transport phenomenon and deposition simulation experiment device, including the sewage pipe of several organic glass tubes (1) flange connection sequentially formed, the sewage pipe is placed on several supports (2), the height of several supports (2) is different, the placement height of sewage pipe is determined according to actual simulation engineering, it is characterized in that: The device also includes a sand adding funnel (3), a screw conveyor (4), a stirrer (5), a water inlet tank (6), a water inlet pump (10), a water return pump (11), a water outlet tank (8), a water return pipe (13), a sand setting open channel (12), a control frequency converter, a control cabinet, one end of the sewage pipeline is communicated with the water inlet tank (6), the other end is communicated with the water outlet tank (8), the water inlet tank (6) is provided with a stirrer (5), the discharge port of the sand adding funnel (3) is connected with the feeding port of the screw conveyor (4), the discharge port of the screw conveyor (4) is located above the water inlet tank (6), the screw conveyor (4) is connected with the control frequency converter, the water inlet tank (6) is provided with a water inlet pump (10) at the communication part with the sewage pipeline; The water outlet tank (8) is provided with an overflow port to overflow to the sand setting open channel (12), the sand setting open channel (12) is communicated with one end of the water return pipe (13) and is provided with a water return pump (11) at the communication part, the other end of the water return pipe (13) is communicated with the water inlet tank (6), the water inlet pump (10) and the water return pump (11) are connected with the control cabinet respectively.

2. The experimental apparatus for simulating the phenomenon of sediment transportation and deposition in a pressurized sewer according to claim 1, characterized in that: The sewage pipeline is provided with an electromagnetic flowmeter, the electromagnetic flowmeter is located 2m away from the water inlet pump (10).

3. The experimental apparatus for simulating the phenomenon of sediment transportation and deposition in a pressurized sewer according to claim 1, characterized in that: The sewage pipeline is provided with a plurality of pressure transmitters, the pressure transmitters are located at both ends of the specific organic glass tube (1) which needs to be tested.

4. The experimental apparatus for simulating the phenomenon of sediment transportation and deposition in a pressurized sewer according to claim 1, characterized in that: Both ends of the sewage pipeline are provided with pvc butterfly valves (9).

5. The experimental apparatus for simulating the phenomenon of sediment transportation and deposition in a pressurized sewer according to claim 1, characterized in that: The highest point of the sewage pipeline is provided with an exhaust valve (14).

6. The experimental apparatus for simulating the phenomenon of sediment transportation and deposition in a pressurized sewer according to claim 1, characterized in that: The bottom of the water inlet tank (6), the lowest point of the sand setting open channel (12) and the lowest point of the sewage pipeline are all provided with a drain pipe, the water outlet of the drain pipe is provided with a manual valve.

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