Anti-siltation drainage pipe system and design method and installation method thereof

Abstract

This invention proposes an anti-siltation drainage pipeline system, comprising a pipeline body, a guide plate adjustment mechanism, a flexible sealing diaphragm, and elastic supports. A closed chamber is formed by the flexible sealing diaphragm, the convex / arched surface of the guide plate, and the pipe wall of the pipeline body. The volume of this closed chamber changes with the water pressure within a certain range. This invention also proposes a design method based on the system described above, including: S1, flow analysis and pressure calculation: calculating the swing angle range of the guide plate and the selection parameters of the elastic supports based on the pipeline diameter, design flow rate, and hydraulic conditions; S2, material selection; S3, using finite element analysis to verify the strength of the guide plate, the rotating shaft, and the shaft connection structure. This invention further proposes an installation method based on the system described above, including component prefabrication, positioning and pushing, anchoring and locking, and functional debugging. This invention can effectively suppress silt deposition in pipelines and improve the overall operating efficiency of the drainage network.

Description

Technical Field

[0001] This invention relates to the field of municipal drainage and water conservancy engineering technology, specifically to an anti-siltation drainage pipeline system and its design and installation methods. Background Technology

[0002] Urban drainage pipe networks are critical infrastructure for ensuring urban water environment safety and flood control and drainage capabilities. During operation, these networks commonly face problems such as sediment deposition and pipe blockage due to flow fluctuations. According to fluid mechanics and sediment kinematics, whether solid particles in water flow can remain suspended or moved depends primarily on the flow velocity. For example, for sediment particles with a diameter of approximately 1 mm, the critical stopping velocity is about 0.35 m / s to 0.40 m / s. To re-activate deposited sediment and put it back into suspension, the required starting velocity increases exponentially (the stirring velocity is about 2.4 times the stopping velocity). However, during non-rainfall periods or low drainage periods, the flow rate and water depth in the pipes are low, and the flow velocity is often below the critical stopping velocity. This leads to the gradual deposition of solid impurities such as sediment at the bottom of the pipes. Long-term accumulation will reduce the effective cross-sectional area of ​​the pipes, significantly weakening the network's transport capacity and becoming a significant hidden danger for urban flooding and sewage overflow.

[0003] To address the problem of pipeline siltation, existing technologies are mainly divided into two categories: reactive dredging and pipe material modification for prevention. The first is reactive dredging, such as high-pressure water jetting, mechanical grabs, or manual cleaning. This method has drawbacks such as high operating costs, low efficiency, need to interrupt traffic, and certain safety hazards, making it difficult to achieve routine and high-frequency maintenance of a large pipeline network. The second is prevention by modifying pipe materials, such as using composite high-smoothness inner linings for the pipe walls. Although this method can reduce the dirt adhesion coefficient, there are problems such as the inner lining layer being prone to peeling and bulging from the pipe substrate, and even forming new sources of blockage.

[0004] Therefore, there is an urgent need to develop an anti-siltation technology solution that can actively adapt to changes in pipeline flow, requires no external energy drive, has a reliable structure, and is easy to implement in existing and newly built pipelines, so as to fundamentally suppress sediment deposition and improve the overall operating efficiency of drainage pipelines. Summary of the Invention

[0005] In view of this, it is necessary to address the shortcomings and deficiencies of existing technologies by proposing a silt-prevention drainage pipeline system and its design and installation methods. By dynamically adjusting the flow cross-section in real time, the drainage pipeline can maintain efficient drainage and silt prevention under different flow conditions, thereby effectively suppressing the phenomenon of sediment deposition in the pipeline and improving the overall operating efficiency of the drainage network.

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

[0007] This invention proposes an anti-siltation drainage pipeline system, including a pipeline body, a flow guide plate adjustment mechanism, a flexible sealing diaphragm, and an elastic support component;

[0008] The guide plate adjustment mechanism includes a guide plate; a hinged edge of the guide plate is hinged to a point on the inner wall of the pipe body via a rotating shaft and a rotating shaft connection structure, thereby allowing the guide plate to swing around the rotating shaft using water flow pressure; the swing angle of the guide plate is automatically adjusted by the water flow pressure inside the pipe; when the water flow pressure inside the pipe increases, the guide plate swings away from the virtual central axis of the pipe body to increase the cross-sectional area of ​​the flow inside the pipe; the cross-sectional structure of the guide plate is arc-shaped.

[0009] The two opposite edges of the flexible sealing diaphragm are flexibly connected to another part of the inner wall of the pipe body and a non-hinged edge of the guide plate opposite to the hinged edge; the length direction of the two diaphragm edges is the same as the length of the pipe body.

[0010] When the water pressure inside the pipe drops to a certain value, the guide plate swings and resets towards the virtual central axis of the pipe body under the action of the elastic support, so as to reduce the cross-sectional area of ​​the flow inside the pipe.

[0011] A closed chamber is formed by the flexible sealing diaphragm, the convex / arched surface of the guide plate, and the pipe wall of the pipe body. The volume of the closed chamber changes with the water pressure within a certain range in the pipe. The closed chamber is connected to the space outside the closed chamber in a waterproof and breathable manner through at least one air pressure balancing valve. The air pressure balancing valve is used to regulate the pressure inside the closed chamber to reduce the resistance when the guide plate swings. When the guide plate swings around the pivot using water pressure, the guide plate, in conjunction with the flexible sealing diaphragm and the inner wall of the pipe body, adjusts the internal volume of the closed chamber, thereby adjusting the flow cross-sectional area of ​​the pipe body.

[0012] Ideally, the concave surface of the guide plate is the flow surface; each pressure balancing valve is installed in the corresponding valve mounting sealing hole of the flexible sealing diaphragm.

[0013] Ideally, the elastic support is an adaptive torque spring, used to cope with changes in water pressure inside the pipe and apply an elastic force to the guide plate to overcome the water pressure.

[0014] Ideally, the pressure balancing valve is equipped with an ePTFE waterproof and breathable membrane.

[0015] Ideally, the elastic support is a solid EPDM rubber strip with a trapezoidal cross-section.

[0016] This invention also proposes an anti-siltation drainage pipeline system, including a pipeline body, a flow guide plate adjustment mechanism, a flexible sealing diaphragm, at least one air pressure balancing valve, and a trapezoidal EPDM solid rubber strip:

[0017] The guide plate adjustment mechanism includes a guide plate and a rotating connection assembly disposed at the bottom of the pipe body; the lower part of the guide plate is hinged to the rotating connection assembly; the guide plate swings around the virtual hinge center axis of the rotating connection assembly to dynamically adjust the flow cross section in the pipe according to the change of water pressure in the pipe body; the cross-sectional structure of the guide plate is arc-shaped.

[0018] The upper and lower edges of the flexible sealing diaphragm are flexibly connected to the top wall of the pipe body and the upper part of the guide plate, respectively.

[0019] A closed chamber is formed by the flexible sealing diaphragm, the guide plate and the pipe wall of the pipe body; each pressure balancing valve is equipped with a layer of ePTFE waterproof and breathable membrane; the pressure balancing valve is used to regulate the air pressure in the closed chamber to reduce the resistance when the guide plate swings.

[0020] The EPDM solid rubber strip is used to expand the guide plate to a position at an angle of 40° to 60° with the center vertical line of the pipe body when the water flow pressure in the pipe is lower than a threshold.

[0021] This invention also proposes an anti-siltation drainage pipeline system, comprising:

[0022] The pipe body has a circular or rectangular cross-section;

[0023] A flow deflector assembly is disposed within the pipe body; the flow deflector assembly includes a flow deflector.

[0024] Flexible sealing diaphragm; the two pairs of sides of the flexible sealing diaphragm that are in the same direction as the length of the pipe body are flexibly connected to one part of the pipe wall of the pipe body and the non-hinged edge of the guide plate opposite to the hinged edge; the hinged edge of the guide plate is hinged to another part of the pipe wall of the pipe body.

[0025] A hydrodynamic drive mechanism is used to automatically adjust the angle of the guide plate according to changes in water pressure inside the pipe.

[0026] A closed chamber formed by a flexible sealing diaphragm, a flow guide plate, and the pipe wall of the pipe body;

[0027] At least one air pressure balancing valve is installed on a flexible sealing diaphragm. The core component of the air pressure balancing valve is an ePTFE waterproof and breathable membrane.

[0028] The elastic support is made of EPDM solid rubber strips with a trapezoidal cross section or adaptive torque springs; when the water pressure in the pipe drops to a certain value, the guide plate is reset under the action of the elastic support.

[0029] This invention further proposes a design method based on the system described above, comprising the following steps:

[0030] S1, Flow analysis and pressure calculation: Based on the pipe diameter, design flow rate and hydraulic conditions, calculate the swing angle range of the guide vane and the selection parameters of the elastic support components of the system.

[0031] S2, Material Selection: Select an ePTFE waterproof and breathable membrane that meets performance requirements, including durability and reliability, through experimental verification.

[0032] S3 utilizes finite element analysis to perform strength verification on the guide vane, shaft, and shaft connection structure, thereby ensuring the stability of the system under various operating conditions.

[0033] This invention further proposes a design method based on the system described above. The guide vane adjustment mechanism includes a rotating mechanism and a deceleration device. The design method includes the following steps:

[0034] The first step is to determine the rotation angle of the guide plate and the adjustment range of the flow cross section based on the needs of the municipal drainage project.

[0035] The second step is to select a trapezoidal EPDM solid rubber strip as an elastic support and optimize the hardness, compression set and elastic modulus parameters of the EPDM solid rubber strip through finite element analysis.

[0036] The third step is to design the structure of the enclosed chamber and design or select the pressure balancing valve.

[0037] The fourth step is to determine the design parameters of the guide vane adjustment mechanism and the flexible sealing diaphragm.

[0038] This invention further proposes an installation method based on the system described above, comprising:

[0039] Component prefabrication: The flow guide plate, elastic support, flexible sealing diaphragm and air pressure balance valve are pre-assembled into an integral module outside the pipeline, and the sealing performance of the connection edges of the flexible sealing diaphragm is tested.

[0040] Positioning and pushing: The overall module is sent into the pipe body to be installed along the pipe axis, and the positioning tool is used to ensure that the axis of the guide plate is parallel to the axis of the pipe body, and the hinge point between the guide plate and the pipe body is located at the bottom of the vertical center line of the pipe cross section.

[0041] Anchoring and locking: The fixed end of the rotating shaft connection structure, the elastic support and one side of the flexible sealing diaphragm are reliably fixed to the inner wall of the pipe body by means of structural adhesive bonding, expansion bolt anchoring or matching with the pre-set groove in the inner wall of the pipe, so as to prevent axial or circumferential displacement under long-term water flow.

[0042] Functional debugging: Conduct a water flow test on the installed system to simulate low and high flow conditions in the pipeline body. Observe and record whether the rotation of the guide plate is smooth, whether the air pressure balance valve works effectively, and whether there is any leakage at each connection. After confirming that all indicators meet the design requirements, the installation is completed.

[0043] The beneficial effects of this invention are as follows:

[0044] This invention utilizes fluid mechanics principles to control the flow cross-section within the pipe through the automatic adjustment of the guide plate. This increases the flow velocity within the pipe at low flow rates to prevent siltation, and restores full-section flow at high flow rates to ensure the pipe's drainage capacity. As a result, the drainage pipe can automatically prevent siltation without external power throughout the entire drainage process, and its structure is simple and reliable. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the cross-sectional structure of an anti-siltation drainage pipeline system of the present invention when draining water at a small flow rate;

[0046] Figure 2 This is a schematic diagram of the cross-sectional structure of an anti-siltation drainage pipeline system of the present invention when a large flow of water is discharged.

[0047] Figure 3 This is an isometric sectional view of an anti-siltation drainage pipeline system according to the present invention;

[0048] Explanation of reference numerals in the attached figures:

[0049] 1. Pipe body; 2. Baffle plate; 3. Shaft; 4. Elastic support; 5. Flexible sealing diaphragm; 6. Enclosed chamber; 7. Pressure balancing valve; 8. Water flow. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be further described clearly and completely below in conjunction with the embodiments of this invention. It should be noted that the described embodiments are merely some embodiments of this invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0051] It should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0052] As used in this specification and the following claims, the words “a,” “an,” and “the” have the meaning of plural reference unless the context clearly indicates otherwise. Furthermore, as used in the description herein, unless the context clearly indicates otherwise, “in” has the meaning of both “in…” and “on…”.

[0053] The terms “first,” “second,” “third,” and “fourth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, the use of “first,” “second,” “third,” and “fourth” to designate a feature may explicitly or implicitly include one or more of that feature.

[0054] The following is a detailed description of embodiments of the invention depicted in the accompanying drawings. The embodiments are detailed in order to clearly convey the invention. However, the amount of detail provided is not intended to limit the contemplative variations of the embodiments; rather, it is intended to cover all modifications, equivalents, and substitutions falling within the spirit and scope of the invention as defined by the appended claims.

[0055] Example 1

[0056] like Figures 1-3 As shown:

[0057] This embodiment proposes a silt-prevention and drainage pipeline system, including a pipeline body 1, a flow guide plate adjustment mechanism, a flexible sealing diaphragm 5, and an elastic support 4;

[0058] The guide plate adjustment mechanism includes a guide plate 2; a hinged edge of the guide plate 2 (preferably the bottom of the guide plate from a mechanical point of view) is hinged to a part of the inner wall of the pipe body 1 (preferably the inner wall of the bottom of the pipe body 1) through a rotating shaft 3 and a rotating shaft connection structure, so that the guide plate 2 swings around the rotating shaft 3 by water flow pressure; the swing angle of the guide plate 2 is automatically adjusted by the water flow pressure in the pipe; when the water flow pressure in the pipe increases, the guide plate 2 swings away from the virtual central axis of the pipe body 1 to increase the cross-sectional area of ​​the flow in the pipe; the cross-sectional structure of the guide plate 2 is arc-shaped;

[0059] The two opposite edges of the flexible sealing diaphragm 5 (preferably the upper edge and the lower edge of the diaphragm) are flexibly connected to another part of the inner wall of the pipe body 1 (preferably the inner wall at the top of the pipe body 1) and a non-hinged edge of the guide plate 2 opposite to the hinged edge (preferably the top of the guide plate from a mechanical point of view); the length direction of the two diaphragm edges is in the same direction as the length of the pipe body 1.

[0060] When the water pressure inside the pipe drops to a certain value, the guide plate 2 swings and resets towards the virtual central axis of the pipe body 1 under the action of the elastic support 4, so as to reduce the cross-sectional area of ​​the flow inside the pipe.

[0061] A closed chamber 6 is formed by the flexible sealing diaphragm 5, the convex / arched surface of the guide plate 2, and the pipe wall of the pipe body 1. The volume of the closed chamber 6 changes with the water pressure within a certain range in the pipe. The closed chamber 6 is connected to the space outside the closed chamber 6 in a waterproof and breathable manner through at least one air pressure balancing valve 7. The air pressure balancing valve 7 is used to adjust the pressure inside the closed chamber 6 to reduce the resistance when the guide plate 2 swings. When the guide plate 2 swings around the rotating shaft 3 using water pressure, the guide plate 2, in conjunction with the flexible sealing diaphragm 5 and the inner wall of the pipe body 1, adjusts the internal volume of the closed chamber 6, thereby adjusting the flow cross-sectional area of ​​the pipe body 1.

[0062] In some embodiments, the concave surface of the guide plate 2 is the flow surface; each pressure balancing valve 7 is installed in the corresponding valve mounting sealing hole of the flexible sealing diaphragm 5.

[0063] In some embodiments, the elastic support 4 is optimized to be an adaptive torque spring, which is used to cope with changes in water pressure in the pipe and to apply an elastic force to the guide plate 2 to overcome the water pressure.

[0064] In some embodiments, the pressure balancing valve 7 is preferably provided with an ePTFE waterproof and breathable membrane.

[0065] In some embodiments, the elastic support 4 is preferably a solid EPDM rubber strip with a trapezoidal cross-section.

[0066] Example 2

[0067] like Figures 1-3 As shown:

[0068] This embodiment proposes an anti-siltation drainage pipeline system, including a pipeline body 1, a flow guide plate adjustment mechanism, a flexible sealing diaphragm 5, at least one air pressure balancing valve 7, and a trapezoidal EPDM solid rubber strip:

[0069] The guide plate adjustment mechanism includes a guide plate 2 and a rotating connection assembly disposed at the bottom of the pipe body 1; the lower part of the guide plate 2 is hinged to the rotating connection assembly; the guide plate 2 swings around the virtual hinge center axis of the rotating connection assembly, thereby dynamically adjusting the flow cross section in the pipe according to the change of water pressure in the pipe body 1; the cross-sectional structure of the guide plate 2 is arc-shaped.

[0070] The upper and lower edges of the flexible sealing diaphragm 5 are flexibly connected to the top wall of the pipe body 1 and the upper part of the guide plate 2, respectively.

[0071] A closed chamber 6 is formed by the flexible sealing diaphragm 5, the guide plate 2 and the pipe wall of the pipe body 1; each pressure balance valve 7 is equipped with a layer of ePTFE waterproof and breathable membrane; the pressure balance valve 7 is used to adjust the air pressure in the closed chamber 6 to reduce the resistance when the guide plate 2 swings.

[0072] The EPDM solid rubber strip is used to expand the guide plate 2 to a position at an angle of 40° to 60° with the center vertical line of the pipe body 1 when the water flow pressure in the pipe is lower than a threshold.

[0073] Example 3

[0074] like Figures 1-3 As shown:

[0075] This embodiment proposes an anti-siltation drainage pipeline system, including:

[0076] Pipe body 1 has a circular or rectangular cross-section;

[0077] A flow guide plate assembly is disposed within the pipe body 1; the flow guide plate assembly includes a flow guide plate 2;

[0078] A flexible sealing diaphragm 5; two pairs of sides of the flexible sealing diaphragm 5 that are in the same direction as the length of the pipe body 1 (preferably the upper and lower sides of the flexible sealing diaphragm 5) are flexibly connected to one part of the pipe wall of the pipe body 1 (from a fluid dynamics perspective, this part is preferably one part of the inner wall of the top of the pipe body 1) and the non-hinged edge of the guide plate 2 (from a mechanical perspective, preferably the top of the guide plate); the hinged edge of the guide plate 2 is hinged to another part of the pipe wall of the pipe body 1; the non-hinged edge of the guide plate 2 is opposite to the hinged edge of the guide plate 2 (from a mechanical perspective, preferably the bottom of the guide plate);

[0079] A hydrodynamic drive mechanism is used to automatically adjust the angle of the guide plate 2 according to changes in water pressure inside the pipe;

[0080] A closed chamber 6 is formed by the flexible sealing diaphragm 5, the guide plate 2 and the pipe wall of the pipe body 1;

[0081] At least one air pressure balancing valve 7 is installed on the flexible sealing diaphragm 5. The core component of the air pressure balancing valve 7 is an ePTFE waterproof and breathable membrane.

[0082] The elastic support 4 is made of EPDM solid rubber strip with a trapezoidal cross section or an adaptive torque spring; when the water pressure in the pipe drops to a certain value, the guide plate 2 is reset under the action of the elastic support 4.

[0083] Further optimized, when the pipe body 1 has a circular cross-section, the cross-sectional structure of the guide plate 2 is arc-shaped.

[0084] Example 4

[0085] like Figures 1-3 As shown:

[0086] This embodiment proposes an anti-siltation drainage pipeline system, including:

[0087] A variable cross-section flow guiding assembly is arranged axially along the inner wall of the pipeline (i.e., the pipeline body 1). The variable cross-section flow guiding assembly includes: an arc-shaped flow guiding plate 2, an elastic offset support member (optionally an elastic support member 4), a flexible sealing diaphragm 5, and a pressure balancing valve 7.

[0088] The arc-shaped guide plate 2 is an arc-shaped strip-shaped component with a certain axial length. The outward convex arc of its cross-section is adapted to the curvature of the inner wall of the pipe to which it is installed, so that when the arc-shaped guide plate 2 is pressed against the inner wall of the pipe, the two form a near-close contact. The arc-shaped guide plate 2 has a first longitudinal side and a second longitudinal side extending along its axial direction. The first longitudinal side is hinged to the bottom area of ​​the inner wall of the pipe through a rotating connection assembly (optionally a rotating shaft 3 and a rotating shaft connection structure that matches the rotating shaft 2), so that the arc-shaped guide plate 2 can swing around the hinge axis of the rotating connection assembly within a preset angle range. The second longitudinal side is fixedly connected to one edge of the flexible sealing diaphragm 5.

[0089] The elastic bias support member has one end acting on the inner wall of the pipe and the other end acting on the concave arc side of the arc-shaped guide plate 2, which is used to apply an elastic bias torque to the arc-shaped guide plate 2 to make it tend to rotate away from the inner wall of the pipe and towards the center of the pipe.

[0090] The flexible sealing diaphragm 5 is a waterproof flexible sheet material with a first connecting edge and a second connecting edge. The first connecting edge is sealed to the second longitudinal side of the arc-shaped guide plate 2, and the second connecting edge is sealed to the top area of ​​the inner wall of the pipe. The arc-shaped guide plate 2, the flexible sealing diaphragm 5 and the inner wall of the pipe between them together form a variable volume closed chamber 6.

[0091] The pressure balancing valve 7 is disposed through the flexible sealing diaphragm 5, preferably located in its upper region. The pressure balancing valve is configured to allow gas to pass through in both directions while preventing liquid water from passing through, so as to balance the pressure difference between the inside and outside of the closed chamber 6 when the volume changes.

[0092] Furthermore, the arc length of the cross-section of the arc-shaped guide plate 2 is set to 1 / 4 to 1 / 2 of the inner circumference of the installed pipe; it is preferably made of a lightweight, high-rigidity, corrosion-resistant material with a density less than that of water, such as fiber-reinforced polymer composite material, rigid polyvinyl chloride, or modified polypropylene, in order to reduce the load on the elastic bias support member and improve its sensitivity and service life.

[0093] Furthermore, the elastic bias support member is at least one element made of an elastic material, such as an elastic strip, torsion spring assembly, or leaf spring made of EPDM rubber; its elastic modulus and preload are precisely calculated and set to ensure that: when the flow rate in the pipe is less than a preset threshold and the hydrodynamic pressure acting on the arc-shaped guide plate 2 is less than the elastic bias torque, the arc-shaped guide plate 2 is supported in a non-fitting position; when the flow rate in the pipe increases and the hydrodynamic pressure is sufficient to overcome the elastic bias torque, the arc-shaped guide plate 2 is pressed against the inner wall of the pipe and fits against it.

[0094] Furthermore, the flexible sealing diaphragm 5 is made of a polymer-coated fabric with high flexibility, high tear strength and excellent weather resistance, such as polyurethane-coated nylon cloth or polyvinyl chloride-coated polyester cloth. Its dimensional redundancy design can meet the deformation requirements of the arc-shaped guide plate 2 from fully expanded to fully fitted, and it is always in a tensioned or slightly relaxed state to avoid excessive shaking under the impact of water flow.

[0095] Furthermore, the pressure balancing valve 7 contains a microporous hydrophobic membrane element, such as an expanded polytetrafluoroethylene membrane, with a pore size between 0.1 micrometers and 10 micrometers, to ensure that while allowing air molecules to pass freely, it effectively blocks the penetration of liquid water molecule clusters, thereby stably performing the pressure balancing function in complex water flow environments.

[0096] Specifically, the anti-siltation drainage pipeline system provided in this embodiment has a core component installed inside the pipeline body 1. The core component includes an arc-shaped guide plate 2, which is preferably made of glass fiber reinforced polypropylene sheet, which has good corrosion resistance and structural rigidity. The arc length of the cross-section of the arc-shaped guide plate 2 is about one-third of the inner circumference of the pipeline body 1, and its radius of curvature is consistent with the inner diameter of the pipeline body 1.

[0097] Specifically, the bottom longitudinal edge of the arc-shaped guide plate 2 is fixed to the lowest generatrix position of the inner wall of the pipe body 1 by a set of rotating connection components (the rotating connection components include a rotating shaft 3 and a rotating shaft connection structure) (the rotating connection components can be stainless steel hinges or piano hinges made of engineering plastic materials); multiple elastic offset support members are arranged axially between the edge of the concave surface of the guide plate 2 on the water flow side and the inner wall of the pipe body 1; in some embodiments, EPDM solid rubber strips with trapezoidal cross sections are selected as elastic offset support members; the hardness, compression set, and elastic modulus of the rubber strip are optimized by finite element analysis, and in a free state, it can expand the arc-shaped guide plate 2 to a position with an angle of about 40° to 60° with the vertical line of the pipe center, such as... Figure 1 As shown;

[0098] The top longitudinal edge of the arc-shaped guide plate 2 is sealed to the lower edge of a flexible sealing diaphragm 5 by high-frequency heat sealing or water-resistant structural adhesive. The flexible sealing diaphragm 5 is made of a composite material of high-strength polyester fiber base cloth coated with thermoplastic polyurethane on both sides, which has excellent flexibility and water tightness. Its upper edge is also sealed and fixed to the top area of ​​the inner wall of the pipe body 1. Thus, the arc-shaped guide plate 2, the flexible sealing diaphragm 5 and the inner wall of the pipe together define a closed chamber 6.

[0099] Above the flexible sealing diaphragm 5, near the top of the pipe, is a pressure balancing valve 7. The core component of this valve body is a layer of ePTFE waterproof and breathable membrane, which is fixed inside the valve housing. This membrane allows air molecules to enter and exit freely, but blocks the penetration of liquid water under normal pressure and several meters of water head pressure.

[0100] The working process of the system described in this embodiment is as follows:

[0101] like Figure 1 As shown, when the flow rate in the pipe is low, the water flow 8 mainly accumulates at the bottom of the pipe; the water level is low and the water pressure is insufficient to overcome the elastic force of the elastic support 4; at this time, the arc-shaped guide plate 2 is supported in the raised position, which significantly reduces the effective flow cross-section of the lower half of the pipe; the water flow 8 is forced to pass through the narrow channel formed by the arc-shaped guide plate 2 and the inner wall of the pipe, and the flow velocity is greatly increased, making it much higher than the stopping flow velocity of the silt, thereby effectively flushing the silt and other solid impurities in the water flow to the downstream and preventing deposition;

[0102] like Figure 2As shown, with rainfall or increased drainage load, the flow rate in the pipe gradually increases, and the water level rises. When the water level overflows the arc-shaped guide plate 2 and continues to rise, the hydrodynamic pressure acting on the water-facing surface of the arc-shaped guide plate 2 also increases. When the torque generated by this pressure around the hinge axis is greater than the offset torque generated by the elastic support, the arc-shaped guide plate 2 begins to overcome the elastic force and rotate towards the inner wall of the pipe. During this process, the volume of the closed chamber 6 gradually decreases, and the air inside is compressed and smoothly discharged through the air pressure balance valve 7, without generating back pressure that hinders the movement of the guide plate. When the flow rate reaches or is close to full pipe, the arc-shaped guide plate 2 is completely pressed to fit against the inner wall of the pipe, and the pipe returns to the full-section flow state, maximizing the drainage capacity.

[0103] When the flow rate decreases again, the water pressure drops, and the elastic potential energy of the elastic support 4 is released, pushing the arc-shaped guide plate 2 to rotate back to the center of the pipe and reset. At this time, the volume of the closed chamber 6 expands, and the air outside the closed chamber 6 inside the pipe is drawn in through the air pressure balance valve 7, avoiding the formation of negative pressure in the chamber and thus preventing the guide plate from resetting. This cycle repeats, and the device realizes fully automatic, powerless, and real-time optimized control of the flow section of the pipeline.

[0104] The anti-siltation and drainage pipeline system provided by this invention ingeniously combines fluid mechanics principles with mechanical structure design. It achieves self-optimization of pipeline flow through a purely physical mechanism. Without any external intervention or energy consumption, it takes into account the core functions of anti-siltation at low flow rates and drainage at high flow rates. It has significant advantages such as simple structure, reliable performance, convenient installation and maintenance, and low total life cycle cost. It has extremely high engineering application value and broad prospects for promotion.

[0105] Example 5

[0106] like Figures 1-3 As shown:

[0107] This embodiment proposes a design method based on the system described in any one of the technical solutions in Embodiments 1-4, including the following steps:

[0108] S1, Flow analysis and pressure calculation: Based on the pipe diameter, design flow rate and hydraulic conditions, calculate the swing angle range of the guide plate 2 and the selection parameters of the elastic support 4 of the system.

[0109] S2, Material Selection: Select an ePTFE waterproof and breathable membrane that meets performance requirements, including durability and reliability, through experimental verification.

[0110] S3. Finite element analysis is used to check the strength of the guide plate 2, the rotating shaft 3 and the connecting structure of the rotating shaft, so as to ensure the stability of the system under various working conditions.

[0111] Example 6

[0112] like Figures 1-3 As shown:

[0113] This embodiment proposes a design method based on the system described in any one of the technical solutions of embodiments 1-4. The guide vane adjustment mechanism includes a rotating mechanism and a deceleration device. The design method includes the following steps:

[0114] The first step is to determine the rotation angle and flow section adjustment range of the guide plate 2 according to the needs of the municipal drainage project.

[0115] The second step is to select a trapezoidal EPDM solid rubber strip as the elastic support 4, and optimize the hardness, compression set and elastic modulus parameters of the EPDM solid rubber strip through finite element analysis.

[0116] The third step is to design the structure of the closed chamber 6 and design or select the pressure balancing valve 7.

[0117] The fourth step is to determine the design parameters of the guide vane adjustment mechanism and the flexible sealing diaphragm 5.

[0118] Example 7

[0119] like Figures 1-3 As shown:

[0120] This embodiment proposes an installation method for an anti-siltation drainage pipeline system based on any one of the technical solutions in Embodiments 1-4, the method comprising:

[0121] S100, component prefabrication: the guide plate 2, elastic support 4, flexible sealing diaphragm 5 and air pressure balance valve 7 are pre-assembled into an integral module outside the pipeline, and the sealing performance of the connection edge of the flexible sealing diaphragm 5 is tested.

[0122] S200, Positioning and Pushing: The overall module is sent into the pipe body 1 to be installed along the pipe axis, and the positioning fixture is used to ensure that the axis of the guide plate 2 is parallel to the axis of the pipe body 1, and the hinge point between the guide plate 2 and the pipe body 1 is located at the bottom of the vertical center line of the pipe cross section.

[0123] S300, Anchoring and Locking: By means of structural adhesive bonding, expansion bolt anchoring or matching with the pre-set groove on the inner wall of the pipe, the fixed end of the rotating shaft connection structure, the elastic support 4 and one side of the flexible sealing diaphragm 5 are reliably fixed to the inner wall of the pipe body 1 to prevent axial or circumferential displacement under long-term water flow.

[0124] S400, Functional Debugging: Conduct a water flow test on the installed system to simulate the low and high flow conditions in the pipe body 1. Observe and record whether the rotation of the guide plate 2 is smooth, whether the air pressure balance valve 7 works effectively, and whether there is any leakage at each connection. After confirming that all indicators meet the design requirements, the installation is completed.

[0125] The advantages of this invention are as follows:

[0126] 1) It can perform active flow regulation and suppress sedimentation from the source: By playing the game between the fluid's own kinetic energy and elastic potential energy, it can forcibly narrow the flow cross section at low flow rates and increase the flow velocity to above the sediment stopping velocity, thus actively preventing the deposition of solid particles, rather than cleaning them up afterward, and realizing a fundamental change in the concept of sediment prevention.

[0127] 2) It has full-condition adaptive capability and can take into account both silt prevention and drainage: The system does not require any sensors, controllers or external energy. It relies entirely on the change of water flow pressure to perform stepless and adaptive flow section adjustment. It can effectively prevent siltation when the pipeline passes through a small flow, and automatically return to position and restore full-section drainage when the pipeline passes through a large flow. It can be compatible with the dual needs of low-load operation of the pipeline network and high-load drainage during the flood season.

[0128] 3) It can perform dynamic air pressure balance and has the advantages of precise and reliable operation: By setting an air pressure balance valve 7 with selective air permeability, the air cushion effect or vacuum adsorption effect that may be generated when the volume of the closed chamber 6 changes is eliminated, ensuring the immediacy, smoothness and final position accuracy of the arc-shaped guide plate 2 rotation, and significantly improving the system's response sensitivity and operational stability.

[0129] 4) It has a high degree of structural integration and strong engineering applicability: It can integrate various functional components into a compact module with simple structure and low manufacturing cost. Its installation process can be pre-installed before pipeline hoisting or lined in existing pipelines, with minimal damage to the original pipeline structure and convenient construction. Its material selection can be designed for durability and lightweight, making the system almost maintenance-free after it is put into operation, which greatly reduces the operation and maintenance cost of the pipeline network throughout its entire life cycle.

[0130] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A silt-prevention and drainage pipeline system, comprising a pipeline body (1), characterized in that, It also includes a deflector adjustment mechanism, a flexible sealing diaphragm (5), and an elastic support (4); The guide plate adjustment mechanism includes a guide plate (2); a hinged edge of the guide plate (2) is hinged to the inner wall of the pipe body (1) through a rotating shaft (3) and a rotating shaft connection structure, so that the guide plate (2) swings around the rotating shaft (3) by water pressure; the swing angle of the guide plate (2) is adjusted by the water pressure in the pipe; when the water pressure in the pipe increases, the guide plate (2) swings away from the virtual central axis of the pipe body (1) to increase the cross-sectional area of ​​the flow in the pipe; the cross-sectional structure of the guide plate (2) is arc-shaped. The two opposite edges of the flexible sealing diaphragm (5) are flexibly connected to another part of the inner wall of the pipe body (1) and a non-hinged edge of the guide plate (2) opposite to the hinged edge; the length direction of the two diaphragm edges is the same as the length of the pipe body (1). When the water pressure in the pipe decreases to a certain value, the guide plate (2) swings and resets towards the virtual central axis of the pipe body (1) under the action of the elastic support (4) to reduce the cross-sectional area of ​​the flow in the pipe. A closed chamber (6) is formed by the convex / arched surface of the flexible sealing diaphragm (5) and the pipe wall of the pipe body (1). The volume of the closed chamber (6) changes with the water pressure within a certain range in the pipe. The closed chamber (6) is connected to the space outside the closed chamber (6) in a waterproof and breathable manner through at least one air pressure balancing valve (7). The air pressure balancing valve (7) is used to adjust the pressure inside the closed chamber (6) to reduce the resistance when the guide plate (2) swings. When the guide plate (2) swings around the rotating shaft (3) using water pressure, the guide plate (2) works with the flexible sealing diaphragm (5) and the inner wall of the pipe body (1) to adjust the internal volume of the closed chamber (6), thereby adjusting the cross-sectional area of ​​the pipe body (1).

2. The system according to claim 1, characterized in that, The concave surface of the guide plate (2) is the flow surface; each pressure balance valve (7) is installed in the corresponding valve installation sealing hole of the flexible sealing diaphragm (5).

3. The system according to claim 1, characterized in that, The elastic support (4) is an adaptive torque spring, which is used to cope with the change of water pressure in the pipe and apply an elastic force to the guide plate (2) to overcome the water pressure.

4. The system according to any one of claims 1-3, characterized in that, The pressure balance valve (7) is equipped with an ePTFE waterproof and breathable membrane.

5. The system according to any one of claims 1-3, characterized in that, The elastic support (4) is a solid EPDM rubber strip with a trapezoidal cross-section.

6. A silt-prevention and drainage pipeline system, comprising a pipeline body (1), characterized in that, It also includes a deflector adjustment mechanism, a flexible sealing diaphragm (5), at least one air pressure balancing valve (7), and a trapezoidal EPDM solid rubber strip: The guide plate adjustment mechanism includes a guide plate (2) and a rotating connection assembly disposed at the bottom of the pipe body (1); the lower part of the guide plate (2) is hinged to the rotating connection assembly; the guide plate (2) swings around the virtual hinge center axis of the rotating connection assembly, thereby dynamically adjusting the flow cross section in the pipe according to the change of water pressure in the pipe body (1); the cross-sectional structure of the guide plate (2) is arc-shaped. The upper and lower edges of the flexible sealing diaphragm (5) are flexibly connected to the top wall of the pipe body (1) and the upper part of the guide plate (2), respectively. A closed chamber (6) is formed by the flexible sealing diaphragm (5), the guide plate (2) and the pipe wall of the pipe body (1); each pressure balance valve (7) is provided with a layer of ePTFE waterproof and breathable membrane; the pressure balance valve (7) is used to adjust the air pressure in the closed chamber (6) to reduce the resistance when the guide plate (2) swings. The EPDM solid rubber strip is used to open the guide plate (2) to a position at an angle of 40° to 60° with the center vertical line of the pipe body (1) when the water flow pressure in the pipe is lower than a threshold.

7. A silt-prevention and drainage pipeline system, characterized in that, include: The pipe body (1) has a circular or rectangular cross-section; A flow guide assembly is disposed within the pipe body (1); the flow guide assembly includes a flow guide (2). Flexible sealing diaphragm (5); the two pairs of sides of the flexible sealing diaphragm (5) that are in the same direction as the length of the pipe body (1) are flexibly connected to one part of the pipe wall of the pipe body (1) and the non-hinged edge of the guide plate (2) that is opposite to the hinged edge; the hinged edge of the guide plate (2) is hinged to another part of the pipe wall of the pipe body (1). A hydrodynamic drive mechanism is used to automatically adjust the angle of the guide plate (2) according to the change in water pressure in the pipe; A closed chamber (6) is formed by the flexible sealing diaphragm (5), the guide plate (2) and the pipe wall of the pipe body (1). At least one air pressure balancing valve (7) is installed on a flexible sealing diaphragm (5). The core component of the air pressure balancing valve (7) is an ePTFE waterproof and breathable membrane. The elastic support (4) is made of EPDM solid rubber strip with a trapezoidal cross section or an adaptive torque spring. When the water pressure in the pipe drops to a certain value, the guide plate (2) is reset under the action of the elastic support (4).

8. A design method based on the system as described in claim 4, characterized in that, Includes the following steps: S1, Flow analysis and pressure calculation: Based on the pipe diameter, design flow rate and hydraulic conditions, calculate the swing angle range of the guide plate (2) of the system and the selection parameters of the elastic support (4); S2, Material Selection: Select an ePTFE waterproof and breathable membrane that meets performance requirements, including durability and reliability, through experimental verification. S3. The strength of the guide plate (2), the shaft (3) and the shaft connection structure are checked by finite element analysis to ensure the stability of the system under various working conditions.

9. A design method based on the system as described in any one of claims 1-4, characterized in that, The guide vane adjustment mechanism includes a rotating mechanism and a speed reduction device. The design method includes the following steps: The first step is to determine the rotation angle and flow section adjustment range of the guide plate (2) according to the needs of the municipal drainage project; The second step is to select a trapezoidal EPDM solid rubber strip as an elastic support (4), and optimize the hardness, compression set and elastic modulus parameters of the EPDM solid rubber strip through finite element analysis. The third step is to design the structure of the closed chamber (6) and design or select the air pressure balance valve (7); The fourth step is to determine the design parameters of the guide vane adjustment mechanism and the flexible sealing diaphragm (5).

10. An installation method based on the system as described in any one of claims 1-5, characterized in that, include: Component prefabrication: The guide plate (2), elastic support (4), flexible sealing diaphragm (5) and air pressure balance valve (7) are pre-assembled into an integral module outside the pipeline, and the sealing performance of the connection edge of the flexible sealing diaphragm (5) is tested. Positioning and pushing: The overall module is sent into the pipe body (1) to be installed along the pipe axis, and the positioning tool is used to ensure that the axis of the guide plate (2) is parallel to the axis of the pipe body (1), and the hinge point of the guide plate (2) and the pipe body (1) is located at the bottom of the vertical center line of the pipe cross section. Anchoring and locking: By means of structural adhesive bonding, expansion bolt anchoring or matching with the pre-set groove on the inner wall of the pipe, the fixed end of the rotating shaft connection structure, the elastic support (4) and one side of the flexible sealing diaphragm (5) are reliably fixed to the inner wall of the pipe body (1) to prevent axial or circumferential displacement under long-term water flow. Functional debugging: After installation, a water flow test is conducted on the system to simulate the low flow and high flow conditions in the pipe body (1). Observe and record whether the rotation of the guide plate (2) is smooth, whether the air pressure balance valve (7) works effectively, and whether there is leakage at each connection. After confirming that all indicators meet the design requirements, the installation is completed.

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