Low-siltation easy-to-maintain underpass water delivery pipeline

Abstract

The present application relates to the field of pipeline body, especially to a low-siltation easy-to-maintain underpass water conveying pipeline, comprising a pipeline body, a flow rate adjusting device for adjusting the inner diameter of the pipeline body is arranged in the pipeline body, the flow rate adjusting device is arranged on the inner side of the pipeline body at the upper end, the flow rate adjusting device extends along the length direction of the pipeline body, when dredging and flushing is needed, the flow rate adjusting device is started to expand downward in the pipeline body, the expansion action of the device directly occupies the space of the upper part of the pipeline, thereby reducing the effective inner diameter of the pipeline body, the reduction of the water passing section area directly leads to the sharp increase of the water flow rate, the increase of the flow rate produces high shear force rapid flow, which can strongly flush the silt and sediment attached to the inner wall and bottom of the pipeline body, at the same time, the flushing water pipe in the operation area can be opened to inject high-pressure water flow into the pipeline body, further assisting in stripping stubborn dirt.

Description

Technical Field

[0001] This invention relates to the field of pipeline bodies, specifically a low-siltation, easy-to-maintain underground water transmission pipeline. Background Technology

[0002] Compared to conventional gravity flow pipelines, cleaning the pipeline itself is complex and costly. Because the pipelines are buried deep underground or traverse complex terrain, traditional dredging equipment cannot directly intervene. Once a blockage occurs, it is often necessary to empty the pipeline, manually go down into the well to clear the blockage, or even carry out large-scale excavation and repair. This not only results in harsh working environments and high safety risks, but also causes significant disruption to the surrounding environment and normal water conveyance operations. Summary of the Invention

[0003] This invention provides a low-siltation, easy-to-maintain underground water pipeline, which overcomes the shortcomings described in the background art.

[0004] The technical solution adopted by this invention to solve its technical problem is: A low-siltation, easy-to-maintain underpass water pipeline includes a pipeline body. A flow rate regulating device for adjusting the inner diameter of the pipeline body is installed inside the pipeline body. The flow rate regulating device is located at the upper inner side of the pipeline body and extends along the length of the pipeline body. When the flow rate of water inside the pipeline body is controlled by the flow rate regulating device, the flow rate regulating device expands downward and reduces the inner diameter of the pipeline body. There are two pipe bodies, and each end of the two pipe bodies is equipped with a knife gate valve and a flushing water pipe. During operation, only the two knife gate valves on one of the two pipe bodies are open. The pipe body has an opening for installing a flow rate regulating device. The flow rate regulating device is installed in the pipe body through the opening, and a sealing rubber layer is provided between the flow rate regulating device and the pipe body. A fixed cover plate is provided on the opening, which abuts against the sealing rubber layer and is fixed to the flow rate regulating device.

[0005] A preferred technical solution is that the flow rate regulating device includes an expansion pressure regulating airbag, the upper end of which is provided with a connecting pipe and a positioning protrusion, a sealing rubber layer is included outside the connecting pipe and the positioning protrusion, and the connecting pipe passes through the fixed cover plate and is connected to an air compressor to control positive and negative pressure. The pipe body is also provided with a plurality of fixing bolts that pass through the fixed cover plate and the sealing rubber layer in sequence, and the fixing bolts and the positioning protrusion form a threaded connection. The inner wall of the pipe body is provided with axially distributed guide ribs. The guide ribs are arranged in a spiral shape and are staggered from the connection surface between the expansion pressure regulating air bag and the pipe body. When the expansion pressure regulating air bag is pressurized by an air compressor and the expansion pressure regulating air bag is expanded outward, the distance between the expansion pressure regulating air bag and the guide ribs becomes smaller, the water pressure increases, and the water flow velocity becomes faster.

[0006] A preferred technical solution is that the pipe body is equipped with knife gate valves at both ends for controlling water flow. The knife gate valve is equipped with a knife gate valve stem and a limiting tube. The limiting tube is fixed to the knife gate valve by a fixing rod provided on its side. The knife gate valve stem passes through the limiting tube. The knife gate valve stem body includes a screw, a hollow helical tube sleeved on the upper outer side of the screw, a handwheel, and a valve plate. The handwheel is located at the upper end of the hollow helical tube. The screw and the hollow helical tube form a screw drive connection. A limit protrusion is provided on the side of the screw, which extends through the limit tube body. The valve plate is fixed at the end of the screw away from the handwheel and abuts against the pipe body. In a preferred technical solution, a water flow velocity detector and a water pressure detector are also provided in the pipeline body. The water flow velocity detector and the water pressure detector are respectively set on the left and right sides of the pipeline body near the valve plate. The water flow velocity detector forms a signal connection with the water pressure detector, the air pressure detector and the air compressor connected to the connecting pipe. The water pressure detector is equipped with a water pressure threshold and the air pressure detector is equipped with an air pressure threshold.

[0007] Compared with existing technologies, this technical solution has the following advantages: When the water flow velocity inside the pipe is lower than the expected velocity and dredging and flushing are required, the flow rate regulating device is activated, causing it to expand downwards into the pipe. This expansion directly encroaches on the upper space of the pipe, reducing its effective inner diameter. Assuming a relatively constant flow rate, the reduced cross-sectional area leads to a sharp increase in water velocity. This increased velocity generates a high-shear jet stream that powerfully flushes away silt and sediment adhering to the inner wall and bottom of the pipe, resuspending it in the water flow and carrying it out of the pipe. Simultaneously, the flushing pipe in the operating area can be opened to inject high-pressure water into the pipe, further aiding in the removal of stubborn dirt. Attached Figure Description

[0008] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0009] Figure 1 This is an overall diagram of the present invention.

[0010] Figure 2 This is a schematic diagram of a partial segment of the pipeline body.

[0011] Figure 3 for Figure 2 Exploded view diagram.

[0012] Figure 4 This is a schematic diagram of the inflatable pressure regulating airbag 41 during contraction.

[0013] Figure 5 This is a schematic diagram of the inflation of the pressure regulating airbag 41.

[0014] Figure 6 This is a side view and a front view of the valve stem.

[0015] Figure 7 This is a schematic diagram of an inverted siphon structure.

[0016] In the diagram: 1. Operating area; 2. Sedimentation well; 3. Inlet pipe; 4. Pipe body; 5. Knife gate valve; 6. Flushing water pipe. Reserved manhole cover 11, reserved manhole cover 21; 41. Inflatable pressure regulating airbag, 411. Connecting pipe, 412. Positioning protrusion, 413. Air pressure detector, 42. Fixing cover plate, 43. Sealing rubber layer, 44. Fixing bolt, 45. Water flow velocity detector, 46. Water pressure detector; Knife gate valve stem body 51, limit tube body 52; Lead screw 511, limit protrusion 5111, hollow solenoid 512, handwheel 513, valve plate 514; Fixed rod 521. Detailed Implementation Example 1

[0017] like Figures 1 to 6 As shown, the present invention proposes a low-siltation, easy-to-maintain underpass water supply pipeline, including a pipeline body 4. The pipeline body 4 is provided with an opening for installing a flow rate regulating device. The flow rate regulating device is installed inside the pipeline body 4 through the opening, and a sealing rubber layer 43 is provided between the flow rate regulating device and the pipeline body 4. A fixing cover plate 42 is provided on the opening, the fixing cover plate 42 abuts against the sealing rubber layer 43, and the fixing cover plate 42 is fixed to the flow rate regulating device.

[0018] Furthermore, the flow rate regulating device includes an expansion pressure regulating airbag 41. The upper end of the expansion pressure regulating airbag 41 is provided with a connecting pipe 411 and a positioning protrusion 412. A sealing rubber layer 43 is included outside the connecting pipe 411 and the positioning protrusion 412. The connecting pipe 411 passes through the fixed cover plate 42 and is connected to an external air compressor to control positive and negative pressure. The pipe body 4 is also provided with multiple fixing bolts 44 that sequentially pass through the fixed cover plate 42 and the sealing rubber layer 43. These fixing bolts 44 form a threaded connection with the positioning protrusion 412. As can be seen above, the pipe body 4, through the threaded connection between the fixing bolts 44 and the positioning protrusion 412, rigidly anchors the expansion pressure regulating airbag 41 inside the pipe body, preventing displacement or deflection during inflation. Simultaneously, the sealing rubber layer 43 is clamped between the fixed cover plate 42 and the opening of the pipe body 4, forming a compression seal under the pre-tightening force of the bolts, effectively sealing the gaps around the connecting pipe 411 and the positioning protrusion 412. This structure allows for 41 radial expansion deformation while maintaining static seal integrity, thus preventing water leakage from the opening under dynamic operating conditions.

[0019] The inner wall of the pipe body 4 is provided with axially distributed guide ribs arranged in a spiral shape. These guide ribs are staggered from the connection surface between the expansion and pressure regulating airbag 41 and the pipe body 4. When the expansion and pressure regulating airbag 41 is pressurized by an air compressor and expands outward, the distance between the expansion and pressure regulating airbag 41 and the guide ribs decreases, the water pressure increases, and the water flow velocity increases. Under normal operating conditions, its spiral structure can induce a slight rotation of the water flow, enhance the turbulence intensity, and inhibit sediment settling. On the other hand, when the expansion and pressure regulating airbag 41 expands and triggers a high-speed water flow, the spiral guide ribs can convert the straight jet into a spiral jet, causing the high-speed water flow to advance along the pipe wall in a spiral trajectory. This rotating flushing mode can cover the entire inner surface of the pipe, including the top and side walls, significantly improving the ability to remove attached dirt, biofilm, and deposits, avoiding the limitation of traditional direct-flow water only acting on the bottom of the pipe, thus achieving a more comprehensive and efficient self-cleaning effect for the pipe.

[0020] Furthermore, the knife gate valve 5 is provided with a knife gate valve stem 51 and a limiting tube 52. The limiting tube 52 is fixed inside the knife gate valve 5 by a fixing rod 521 provided on its side. The knife gate valve stem 51 passes through the limiting tube 52. The knife gate valve stem 51 includes a screw 511, a hollow helical tube 512 sleeved on the upper outer side of the screw 511, a handwheel 513, and a valve plate 514. The handwheel 513 is provided at the upper end of the hollow helical tube 512. The screw 511 and the hollow helical tube 512 form a screw drive connection. A limiting protrusion 5111 is provided on the side of the screw 511. The limiting protrusion 5111 extends through the limiting tube 52. The valve plate 514 is fixed to the end of the screw 511 away from the handwheel 513 and abuts against the pipe body 4. The pipe body 4 is also equipped with a water flow velocity detector 45 and a water pressure detector 46. The water flow velocity detector 45 and the water pressure detector 46 are respectively located on the left and right sides of the pipe body 4 near the valve plate 514. The water flow velocity detector 45 is connected to the water pressure detector 46, the air pressure detector 413 and the air compressor connected to the connecting pipe 411. The water pressure detector 46 is equipped with a water pressure threshold and the air pressure detector 413 is equipped with an air pressure threshold.

[0021] By dynamically adjusting the positive and negative pressure output of the air compressor connected to the connecting pipe 411 through preset high and low thresholds, the expansion degree of the expansion pressure regulating airbag 41 is precisely controlled, thereby realizing intelligent regulation of water pressure and flow rate within the pipe body 4. This mechanism has significant engineering value and practical significance.

[0022] First, the water pressure detector 46 sets a maximum and a minimum water pressure threshold. When the pipe's cross-sectional area decreases and head loss increases due to siltation, the local water pressure rises and exceeds the maximum threshold, indicating a risk of blockage. Conversely, if the water pressure remains below the minimum threshold for an extended period, it may indicate insufficient flushing or severe sedimentation. At this time, the water flow velocity detector 45 simultaneously provides flow velocity data as an auxiliary basis for judgment; a persistently low flow velocity further verifies the siltation status. Once the threshold condition is triggered, the control system automatically starts the air compressor to inject positive pressure gas into the expansion and pressure regulating airbag 41, causing it to expand, reducing the cross-sectional area, and increasing the flow velocity and flushing force. When the water pressure returns to a safe range and the flow velocity reaches the standard, the system switches to using the air compressor to draw negative pressure or release pressure, causing the expansion and pressure regulating airbag 41 to contract and return to normal operation.

[0023] Meanwhile, the pressure detector 413 sets a pressure threshold to prevent the expansion pressure regulating airbag 41 from over-inflating, which could cause structural damage or seal failure. When the internal pressure of the expansion pressure regulating airbag 41 approaches the material's pressure-bearing limit, the system immediately stops pressurizing to ensure device safety. Furthermore, the expansion pressure regulating airbag 41 in this invention has different densities in its upper and lower parts. The upper part of the expansion pressure regulating airbag 41 has a higher density than its lower part. This arrangement is mainly to ensure that when the expansion pressure regulating airbag 41 is normally installed or when its interior is under negative pressure, its upper part can effectively maintain its original structural shape, while its lower part can expand or contract according to the positive or negative pressure formed by the air compressor connected to the connecting pipe 411, thereby changing the inner diameter of the pipe body 4. When the inner diameter is changed, the water pressure is changed and the flow rate is adjusted. Furthermore, in this invention, both the pipe body 4 and the expansion pressure regulating airbag 41 can be set as segmented structures, and each expansion pressure regulating airbag 41 can be driven to expand and contract by an air compressor. Although this setting will increase the cost to a certain extent, it can effectively control the inner diameter of each segment in the whole pipe during use, thereby achieving more precise water pressure adjustment. And, as Figure 1 , Figure 6 As shown, flushing pipes 6 are also installed at both ends of the side of the pipe body 4. When sludge removal and flushing are required, the flow rate regulating device is activated, causing it to expand downwards into the pipe. The expansion action of the device directly occupies the space above the pipe, thereby reducing the effective inner diameter of the pipe body 4. Under the premise that the pipe flow rate remains relatively constant, the reduction in the cross-sectional area will directly lead to a sharp increase in the water flow velocity. This increase in flow velocity generates a high-shear force jet, which can powerfully flush away the sludge and sediments attached to the inner wall and bottom of the pipe body, causing them to be resuspended in the water flow and carried out of the pipe. At the same time, the flushing pipes 6 in the operating area can be opened to inject high-pressure water into the pipe body 4, further assisting in the removal of stubborn dirt. Example 2

[0024] like Figure 7 As shown, this example proposes an inverted siphon based on Embodiment 1. The inverted siphon includes two inverted siphons installed underground, which are connected by a pipe body 4. Both inverted siphons are equipped with inlet pipes 3. It should be explained that, in use, one of the two inverted siphons is the inlet well, and the other is the outlet well. The inverted siphon includes an operating area 1 and a sedimentation well 2. The inlet pipe 3 is connected to the middle of the sedimentation well 2. Operating areas 1 are divided into two layers from top to bottom. The pipe body 4 extends into operating layer two and connects to the lower part of the sedimentation well 2. Operating layer two contains a gate valve 5 and a flushing pipe 6 connected to the pipe body 4. The gate valve 5 and flushing pipe 6 both extend into operating layer one. The upper end of the sedimentation well 2 is connected outwards via a pre-installed manhole cover 21. The upper end of Zone 1 is connected to the outside through a reserved manhole cover 11; the connection end of the pipe body 4 and the sedimentation well 2 forms a sedimentation tank for sedimentation between the inner lower end face of the sedimentation well 2; a flow rate regulating device for adjusting the inner diameter of the pipe body 4 is provided inside the pipe body 4. The flow rate regulating device is located at the upper inner end of the pipe body 4 and extends along the length of the pipe body 4. When the flow rate of the water in the pipe body 4 is controlled by the flow rate regulating device, the flow rate regulating device expands downward and reduces the inner diameter of the pipe body 4.

[0025] When water flows in from the inlet well, it first enters the sedimentation well 2 within the well body. By design, the inlet pipe 3, which connects to the external pipe network, is connected to the middle of the sedimentation well, not the bottom. This mid-position inlet method forces the water to flow upwards first within the sedimentation well, then turn downwards. During this process, the cross-section of the water flow channel suddenly expands, resulting in a significant decrease in flow velocity. The reduced kinetic energy carried by the water causes suspended particles such as silt to settle naturally due to gravity. Because the inlet pipe is located in the middle, the settled silt cannot flow directly out with the main flow, but instead deposits at the bottom of the sedimentation well. This bottom area forms a dedicated sedimentation tank space between itself and the connection point to the main pipe 4, used to accommodate the sediment. After initial sedimentation and removal of most of the silt, the water then flows from the bottom of the sedimentation well into the main pipe 4, flowing towards the outlet well. The outlet well also has a sedimentation well structure, which allows for secondary sedimentation and buffering of the flowing water, effectively preventing large particles of silt from entering deep into the main pipe and causing blockages, thus achieving physical sedimentation and separation.

[0026] The above are merely preferred embodiments of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A low-siltation, easy-to-maintain underground water transmission pipeline, characterized in that, Includes a pipe body (4), and a flow rate regulating device for adjusting the inner diameter of the pipe body (4) is provided inside the pipe body (4). The flow rate regulating device is located at the upper end of the inner side of the pipe body (4) and extends along the length of the pipe body (4). When the flow rate of water inside the pipe body (4) is controlled by the flow rate regulating device, the flow rate regulating device expands downward and reduces the inner diameter of the pipe body (4). There are two pipe bodies (4). Both ends of the two pipe bodies (4) are equipped with knife gate valves (5) and flushing water pipes (6). When working, only one of the two pipe bodies (4) has two knife gate valves (5) in the open state. The pipe body (4) is provided with an opening for installing a flow rate regulating device. The flow rate regulating device is installed inside the pipe body (4) through the opening. A sealing rubber layer (43) is provided between the flow rate regulating device and the pipe body (4). A fixed cover plate (42) is provided on the opening. The fixed cover plate (42) abuts against the sealing rubber layer (43) and is fixed to the flow rate regulating device.

2. A low-siltation, easy-to-maintain underground water transmission pipeline according to claim 1, characterized in that, The flow rate regulating device includes an expansion pressure regulating airbag (41), with a connecting pipe (411) and a positioning protrusion (412) at the upper end of the expansion pressure regulating airbag (41). A sealing rubber layer (43) is included outside the connecting pipe (411) and the positioning protrusion (412). The connecting pipe (411) passes through the fixed cover plate (42) and is connected to an air compressor to control positive and negative pressure. The pipe body (4) is also provided with a number of fixing bolts (44) that pass through the fixed cover plate (42) and the sealing rubber layer (43) in sequence. The fixing bolts (44) and the positioning protrusion (412) form a threaded connection. The inner wall of the pipe body (4) is provided with axially distributed guide ribs. The guide ribs are arranged in a spiral shape and are staggered from the connection surface between the expansion pressure regulating air bag (41) and the pipe body (4). When the expansion pressure regulating air bag (41) is pressurized by the air compressor and the expansion pressure regulating air bag (41) is expanded outward, the distance between the expansion pressure regulating air bag (41) and the guide ribs becomes smaller, the water pressure increases, and the water flow velocity becomes faster.

3. A low-siltation, easy-to-maintain underground water transmission pipeline according to claim 2, characterized in that, The pipe body (4) is equipped with knife gate valves (5) at both ends for controlling water flow. The knife gate valve (5) is equipped with a knife gate valve stem (51) and a limiting tube (52). The limiting tube (52) is fixed inside the knife gate valve (5) by a fixing rod (521) provided on its side. The knife gate valve stem (51) passes through the limiting tube (52). The knife gate valve stem body (51) includes a screw (511), a hollow helical tube (512) sleeved on the upper outer side of the screw (511), a handwheel (513), and a valve plate (514). The handwheel (513) is located at the upper end of the hollow helical tube (512). The screw (511) and the hollow helical tube (512) form a screw drive connection. A limiting protrusion (5111) is provided on the side of the screw (511). The limiting protrusion (5111) extends through the limiting tube body (52). The valve plate (514) is fixed to the end of the screw (511) away from the handwheel (513) and abuts against the pipe body (4).

4. A low-siltation, easy-to-maintain underground water transmission pipeline according to claim 3, characterized in that, The pipe body (4) is also equipped with a water flow velocity detector (45) and a water pressure detector (46). The water flow velocity detector (45) and the water pressure detector (46) are respectively located on the left and right sides of the pipe body (4) near the valve plate (514). The water flow velocity detector (45) forms a signal connection with the water pressure detector (46), the air pressure detector (413) and the air compressor connected to the connecting pipe (411). The water pressure detector (46) is equipped with a water pressure threshold, and the air pressure detector (413) is equipped with an air pressure threshold.

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