Intelligent cut-off anti-backflow device and operation method

Abstract

This invention discloses an intelligent backflow prevention device and its operating method, relating to the field of municipal drainage and sewage treatment technology. The intelligent backflow prevention device includes an installation plate, a door plate, a circular cylinder, and a hollow air bladder. The installation plate is positioned at the pipe opening and fixed to a civil engineering foundation. The door plate is rotatably connected to the installation plate and is used to open or close the pipe opening. The circular cylinder is connected to the door plate, and its central axis can be parallel to the central axis of the pipe. The hollow air bladder is sleeved on the outside of the circular cylinder. The hollow air bladder has a hollow inner cavity and an air nozzle connected to the hollow inner cavity. The air nozzle is used to connect an external inflation device. The hollow air bladder inflates to seal the pipe opening. This device has a simple structure, is easy to install, and has a good sealing effect, integrating both backflow prevention and interception functions.

Description

Technical Field

[0001] This invention relates to the field of municipal drainage and sewage treatment technology, specifically to an intelligent interception and backflow prevention device and its operation method. Background Technology

[0002] Currently, municipal drainage pipe networks generally suffer from operational shortcomings and governance challenges, with two core issues being particularly prominent. On the one hand, backflow of river and lake water into the drainage network is frequent. River and lake water flows backward into the pipe network through rainwater outlets, easily causing long-term high-level water accumulation and severe siltation in rainwater pipes. Simultaneously, large amounts of external water mix into the sewage collection system, not only diluting the sewage concentration but also significantly increasing the influent volume and treatment load of sewage treatment plants. This results in lower influent concentrations at sewage treatment plants, increased energy consumption for operation and maintenance, and decreased treatment efficiency, seriously affecting the stable operation of municipal sewage systems. On the other hand, commonly used anti-backflow devices in the industry, such as duckbill valves and traditional flap valves, generally suffer from poor sealing performance, large closing gaps, and significant reverse leakage, making it difficult to achieve complete sealing against backflow and failing to meet high-standard water management requirements.

[0003] At the same time, old urban areas generally suffer from mixed or incorrect connections between rainwater and sewage. During the dry season, mixed sewage is easily discharged directly through rainwater outlets, causing water pollution. Existing interception gates, weirs, and other interception equipment are complex in structure, expensive, and have strict requirements for civil engineering installation foundations and construction conditions. The installation and renovation cycle is long and the construction cost is high, making it difficult to widely apply them.

[0004] Therefore, the current device has technical problems such as complex structure, poor sealing effect, and inability to meet the integrated requirements of interception and backflow prevention. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose an intelligent interception and backflow prevention device and operation method, which solves the technical problems of existing devices having complex structures, poor sealing effects, and inability to meet the integrated requirements of interception and backflow prevention.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides an intelligent interception and backflow prevention device, which includes an installation plate, a door plate, a circular cylinder, and a medium-sized air bladder. The installation plate is disposed at the opening of the pipe and fixed to the civil engineering foundation. The door plate is rotatably connected to the installation plate and is used to open or close the pipe opening. The circular cylinder is connected to the door plate, and its central axis can be parallel to the central axis of the pipe. The medium-sized air bladder is sleeved on the outside of the circular cylinder. The medium-sized air bladder has a hollow inner cavity and an air nozzle connected to the hollow inner cavity. The air nozzle is used to connect an external inflation device. The medium-sized air bladder is inflated to seal the opening of the pipe.

[0007] In some embodiments, the mounting plate includes a first part and a second part connected together. The first part is fixed to the civil engineering foundation, and the second part is provided with a first annular surface. The side of the annular cylinder facing away from the door panel is provided with a second annular surface. An air bladder is correspondingly disposed between the first annular surface and the second annular surface. The air bladder is inflated and expands to seal the gap between the first annular surface and the second annular surface.

[0008] In some embodiments, the air bladder is fitted onto the second annular surface of the cylindrical tube and is fixedly connected to the second annular surface.

[0009] In some embodiments, the air bladder is a hollow rubber air bladder, and the hollow rubber air bladder is vulcanized and fixed to the second annular surface of the cylindrical ring.

[0010] In some embodiments, the air bladder is a pre-formed hollow rubber air bladder, which is detachably mounted on the second annular surface of the cylindrical ring.

[0011] In some embodiments, the intelligent interception and backflow prevention device further includes a tilt sensor or a liquid level sensor. The tilt sensor is fixed on the door panel to obtain the tilt angle of the door panel; the liquid level sensor is fixed on both sides of the door panel to obtain the liquid level height inside and outside the pipe.

[0012] In some embodiments, the intelligent interception and backflow prevention device further includes a drive actuator assembly, which includes a mounting bracket and a drive actuator fixed to the mounting bracket, the drive actuator being used to rotate the door panel.

[0013] In some embodiments, the mounting bracket is located above the door panel in the direction of gravity, and the drive actuator is a cylinder or a hydraulic cylinder.

[0014] In some embodiments, the piston rod of the drive actuator is connected to the door panel, and the piston rod of the drive actuator is used to control the opening or closing of the door panel.

[0015] Secondly, the present invention also provides an operating method for an intelligent interception and backflow prevention device, applied to the aforementioned intelligent interception and backflow prevention device. The intelligent interception and backflow prevention device includes a drive actuator assembly. The operating method includes: when the pipe opening needs to be closed, controlling the piston rod of the drive actuator to extend and push the door plate so that the door plate rotates to the closing angle position; inflating the hollow inner cavity of the air bladder so that the air bladder inflates and seals the pipe opening; when the pipe opening needs to be reopened, controlling the air bladder to depressurize and vent air, and controlling the piston rod of the drive actuator to retract.

[0016] Compared with existing technologies, the intelligent interception and backflow prevention device provided by this invention is composed of an installation plate, a gate plate, a circular cylinder, and a medium-sized air bladder. It has fewer components and a simple, compact overall structure. The device can be directly fixed to a civil engineering foundation, making installation simple and quick, and highly adaptable to the site. By utilizing the inflation and expansion of the medium-sized air bladder to form a flexible sealing structure, it can achieve the dual functions of pipeline interception and river / lake backflow prevention in one integrated manner, effectively overcoming the technical shortcomings of existing devices, such as complex structure and single function. Compared with traditional backflow prevention flap gates, it can achieve zero-leakage sealing; compared with conventional interception gates and weirs, it also has the advantages of low cost and easy installation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an intelligent interception and backflow prevention device in the closed state according to an embodiment of the present invention; Figure 2 This is a schematic diagram of an intelligent interception and backflow prevention device in the open state provided in an embodiment of the present invention; Figure 3 This is a side view of the intelligent interception and backflow prevention device provided in an embodiment of the present invention; Figure 4 yes Figure 1 A magnified schematic diagram of part A in the middle section; Figure 5 yes Figure 1 A partially enlarged structural diagram of section B; Figure 6 This is a schematic diagram of another intelligent interception and backflow prevention device provided in the embodiment of the present invention in the closed state; Figure 7 This is a schematic diagram of another intelligent interception and backflow prevention device provided in an embodiment of the present invention in the open state; Figure 8 This is a schematic diagram of the operation method of the intelligent interception and backflow prevention device provided in the embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 100. Intelligent interception and backflow prevention device; 110. Mounting plate; 111. First part; 112. Second part; 113. First annular surface; 114. Mounting hole; 115. Abutment part; 120. Door panel; 121. Pin; 122. Arched door body; 123. Limiting part; 124. Arc-shaped top surface; 130. Circular cylinder; 131. Second annular surface; 140. Hollow air bladder; 141. Hollow inner cavity; 142. Air nozzle; 150. Drive actuator assembly; 151. Mounting bracket; 152. Drive actuator; 200. Pipeline; 300. Civil engineering foundation; 400. Operating method. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] Municipal drainage pipe networks currently face significant challenges in management. River and lake water easily flows back into the network, severely disrupting the stable operation of the sewage system. Meanwhile, conventional backflow prevention equipment suffers from poor sealing performance, and interception devices are complex in structure, expensive, and poorly implemented. Coupled with the problem of combined sewer overflows, this easily leads to direct discharge of sewage during the dry season. Existing devices generally have poor sealing performance, cumbersome structures, and cannot achieve integrated interception and backflow prevention, resulting in significant limitations in practical application.

[0021] To address the technical problems of complex structures, poor sealing performance, and inability to simultaneously meet the requirements of interception and backflow prevention, this invention provides an intelligent interception and backflow prevention device. This device is easy to install, has a good sealing effect, and can integrate the dual functions of interception and backflow prevention.

[0022] It should be noted that the intelligent interception and backflow prevention device provided by the present invention is used in, but not limited to, municipal pipe network drainage, sewage treatment plants and other application scenarios. For ease of explanation, this invention will only use the application of the intelligent interception and backflow prevention device in the municipal pipe network drainage scenario as an example for explanation. The principle of the intelligent interception and backflow prevention device in other scenarios is essentially the same as that in the municipal pipe network drainage scenario, and will not be described in detail here.

[0023] This invention provides an intelligent interception and backflow prevention device 100, such as... Figures 1 to 5 As shown, the intelligent interception and backflow prevention device 100 includes an installation plate 110, a door plate 120, a circular cylinder 130, and a medium-sized air bladder 140. The installation plate 110 is disposed at the opening of the pipe 200 and fixed on the civil foundation 300. The door plate 120 is rotatably connected to the installation plate 110 and is used to open or close the opening of the pipe 200. The circular cylinder 130 is connected to the door plate 120, and its central axis can be parallel to the central axis of the pipe 200. The medium-sized air bladder 140 is sleeved on the outside of the circular cylinder 130. The medium-sized air bladder 140 has a hollow inner cavity 141 and an air nozzle 142 connected to the hollow inner cavity 141. The air nozzle 142 is used to connect an external inflation device. The medium-sized air bladder 140 is inflated to seal the opening of the pipe 200.

[0024] Mounting plate 110 is a component used to install and fix the intelligent interception and backflow prevention device 100 onto the civil engineering foundation 300. Mounting plate 110 is directly fixed to the civil engineering foundation 300, achieving integral wall-mounted installation without complex civil engineering modifications. For example, mounting plate 110 can be fixed to the plane of the civil engineering foundation 300 with bolts. The material of mounting plate 110 is not limited, as long as it meets strength requirements.

[0025] The door panel 120 is a component used for shutting off and preventing backflow in the pipe 200. The door panel 120 and the mounting plate 110 are connected by a pivot pin 121, allowing them to be flipped relative to each other to open or close the opening of the pipe 200. The material of the door panel 120 is not limited, as long as it meets the strength requirements; for example, the door panel 120 and the mounting plate 110 can be made of the same metal material.

[0026] The annular cylinder 130 adopts a hollow annular structure and is fixed to the edge of the door panel 120; the annular cylinder 130 can be made of metal materials such as steel. The central axis of the annular cylinder 130 is parallel to the central axis of the pipe 200 to ensure coaxial alignment after assembly and ensure sealing accuracy.

[0027] The air bladder 140 is a component that expands and seals the gap of the opening of the air-filled tube 200 through inflation. The air bladder 140 has a hollow inner cavity 141 inside, and the air nozzle 142 is connected to the hollow inner cavity 141. Air can be injected into the hollow inner cavity 141 through the air nozzle 142, causing the air bladder 140 to expand and deform as a whole.

[0028] It should be noted that the air bladder 140 can seal the gap between the annular cylinder 130 and the inner wall of the pipe 200 to achieve a reliable seal; the air bladder 140 can also seal the gap between the annular cylinder 130 and the mounting plate 110 to achieve a reliable seal.

[0029] For example, when there is no rain on a sunny day, the flow channel of pipe 200 needs to be closed. The door panel 120 of the intelligent interception and backflow prevention device 100 flips to the closed and sealed position by its own weight. At this time, the air bladder 140 enters the pipe 200 as the door panel rotates. The control system inflates the air bladder 140 through the air nozzle 142, causing the air bladder to expand and form a seal against the inner wall of pipe 200, completely blocking the flow channel of the pipe and achieving interception. When there is rain, pipe 200 needs to be opened for flood discharge. First, the air bladder 140 is depressurized and vented, and the air bladder contracts and releases the seal. Under the pressure of the incoming water in pipe 200, the door panel 120 automatically flips open, allowing rainwater to be discharged smoothly.

[0030] In this embodiment, the intelligent interception and backflow prevention device 100 is composed of an mounting plate 110, a gate plate 120, a circular cylinder 130, and a medium-sized air bladder 140. It has few components and a simple, compact overall structure. The device can be directly fixed to the civil engineering foundation 300, making installation simple and quick, and highly adaptable to the site. By utilizing the inflatable medium-sized air bladder 140 to form a flexible sealing structure, it can integrate the dual functions of intercepting the pipeline 200 and preventing backflow into rivers and lakes, effectively overcoming the technical shortcomings of existing devices with complex structures and single functions. Compared to traditional backflow prevention flap gates, it can achieve zero-leakage sealing; compared to conventional interception gates and weirs, it also has the advantages of low cost and easy installation.

[0031] In some embodiments, such as Figure 1and Figure 4 As shown, the mounting plate 110 includes a first part 111 and a second part 112 connected together. The first part 111 is fixed on the civil foundation 300. The second part 112 is provided with a first annular surface 113. The annular cylinder 130 is provided with a second annular surface 131 on the side facing away from the door panel 120. The air bladder 140 is correspondingly provided between the first annular surface 113 and the second annular surface 131. The air bladder 140 is inflated and expands to seal the gap between the first annular surface 113 and the second annular surface 131.

[0032] In this embodiment, the mounting plate 110 includes a first part 111 and a second part 112 arranged perpendicularly to each other; wherein the first part 111 is used to fix to the civil foundation 300, and the second part 112 is used to cooperate with the annular cylinder 130 to form a sealing mating surface. When the pipeline 200 is in the closed state, the second part 112 has a first annular surface 113 facing the annular cylinder 130, and the annular cylinder 130 is correspondingly provided with a second annular surface 131 facing the second part 112; the air bladder 140 is sandwiched between the two annular surfaces, and after inflation, it can uniformly fill the annular gap to achieve a reliable seal.

[0033] In this embodiment, the air bladder 140 achieves sealing by sealing the gap between the annular cylinder 130 and the mounting plate 110. The annular cylinder 130 and mounting plate 110, along with other components, can be pre-assembled as a whole and simply fixed to the opening of the pipe 200. Compared to the method of sealing the gap between the annular cylinder 130 and the inner wall of the pipe 200 using an air bladder, this structure eliminates the need for strict alignment of the annular cylinder 130 and the central axis of the pipe 200, reducing the installation alignment accuracy requirements and simplifying construction while still ensuring a sealing effect.

[0034] In some embodiments, such as Figure 1 and Figure 3 As shown, the first part 111 is provided with a plurality of mounting holes 114 evenly spaced along the circumference of the opening of the pipe 200. The mounting holes 114 are used for bolts to connect to the civil foundation 300.

[0035] In this embodiment, the first part 111 has a plurality of mounting holes 114 evenly formed around the circumference of the pipe opening. The specific quantity can be determined according to needs, such as 6, 8, 10, 12, etc. It is fixed to the civil engineering foundation with bolts at a 300mm angle. The circumferentially evenly distributed structure ensures uniform stress distribution and load dispersion during installation, effectively avoiding localized stress concentration and ensuring overall secure fixing. It also facilitates on-site alignment and assembly, as well as subsequent disassembly and maintenance, improving structural stability and installation adaptability.

[0036] In some embodiments, such as Figure 1As shown, on a plane perpendicular to the axial direction of pipe 200, the orthographic projection of the inner wall profile of pipe 200 lies within the orthographic projection range of the profile of the first annular surface 113.

[0037] In this embodiment, the orthographic projection of the inner wall of the pipe 200 is located within the orthographic projection range of the first annular surface 113, that is, the inner diameter of the pipe 200 is less than or equal to the inner diameter of the first annular surface 113. This structure can prevent the water flow inside the pipe 200 from directly impacting the mounting plate 110, thereby improving the fixing reliability of the mounting plate 110; at the same time, it facilitates the smooth discharge of water inside the pipe, effectively reducing the risk of leakage at the edge gaps.

[0038] In some embodiments, such as Figure 1 and Figure 2 As shown, the second part 112 is provided with an abutment part 115 at the end away from the pipe 200, and the door panel 120 is provided with a limiting part 123 corresponding to the abutment part 115.

[0039] In this embodiment, the abutting part 115 and the limiting part 123 cooperate with each other to form a mechanical limit on the flip-closed position of the door panel 120, accurately constrain the closing angle of the door panel, prevent it from over-flipping or misaligning, and ensure that the door panel can be accurately aligned to the sealing position every time it closes, effectively assisting the airbag to fit and seal, and improving the reliability of the seal.

[0040] In some embodiments, such as Figure 2 and Figure 4 As shown, the air bladder 140 is sleeved on the second annular surface 131 of the cylindrical ring 130 and is fixedly connected to the second annular surface 131.

[0041] In this embodiment, the air bladder 140 is directly fitted and fixed on the second annular surface 131, and the assembly positioning is accurate; during operation, the air bladder 140 is not easy to shift or loosen, and the sealing position is stable and reliable during long-term operation, resulting in less maintenance workload in the later stage.

[0042] In some embodiments, such as Figure 1 and Figure 5 As shown, the hollow air bladder 140 is a hollow rubber air bladder, and the hollow rubber air bladder is vulcanized and fixed on the second annular surface 131 of the cylindrical ring 130.

[0043] In this embodiment, the hollow rubber airbag is vulcanized and fixed to the cylindrical ring 130 as one piece. Compared with conventional adhesive fixing methods, the bonding strength is higher, and it has excellent water pressure resistance and aging resistance. It is not easy to delaminate or crack. It can be adapted to the complex working conditions of municipal drainage, which are humid and pressurized, and effectively extend the service life of the device.

[0044] In some embodiments, the air bladder is a pre-formed hollow rubber air bladder, which is detachably mounted on the second annular surface 131 of the annular cylinder 130.

[0045] In this embodiment, the air-filled airbag can be prefabricated and installed on-site, thereby saving on-site construction time; at the same time, the air-filled airbag adopts a detachable connection method, which facilitates subsequent replacement and improves the convenience of maintenance.

[0046] In some embodiments, the door panel structure includes, but is not limited to, flat door panels and arched door panels.

[0047] In some embodiments, such as Figure 1 As shown, the door panel 120 is provided with an arched door body 122 protruding outward from the pipe 200, and the annular cylinder 130 is integrally welded and fixed to the outer periphery of the arched door body 122.

[0048] In this embodiment, the door panel 120 adopts an outwardly convex arched door body 122, which has excellent structural mechanical properties and can effectively resist the impact of external water pressure and backflow. The annular cylinder 130 and the arched door body 122 are integrally welded together, resulting in high overall structural rigidity and small deformation, which can always ensure the coaxial accuracy of the seal and avoid seal failure due to component deformation.

[0049] In some embodiments, the intelligent interception and backflow prevention device 100 further includes a tilt sensor, which is fixed on the door panel 120 and used to obtain the tilt angle of the door panel 120.

[0050] In this embodiment, the tilt sensor, also known as an inclinometer, level, or inclinometer, is used to measure changes in the horizontal angle of the system. By installing a tilt sensor on the door panel 120, the tilt angle of the door panel 120 can be collected in real time, accurately identifying the opening and closing conditions of the door panel 120, providing real-time monitoring data support for the intelligent control system, thereby realizing automated and intelligent control of the device's operating status.

[0051] In some embodiments, the intelligent interception and backflow prevention device 100 further includes a liquid level sensor, which is fixed on both sides of the door panel 120 to obtain the liquid level height inside and outside the pipe 200.

[0052] In this embodiment, a liquid level sensor is installed at the front and back of the door panel 120. The liquid level sensor can obtain the liquid level height inside the pipe 200 and the downstream river and lake in real time, accurately identify the liquid level situation inside the pipe 200 and the downstream, and provide real-time monitoring data support for the intelligent control system. The control system can control the opening and closing of the door panel 120 in real time according to the liquid level height.

[0053] In some embodiments, a sealing gasket is also provided between the mounting plate 110 and the civil foundation 300.

[0054] In this embodiment, a sealing gasket is added between the mounting plate 110 and the civil foundation 300 to seal the gaps at the assembly contact surfaces. This not only prevents external water from seeping into the pipe 200 but also prevents water from leaking out of the pipe, significantly improving the overall seepage prevention and water-stopping performance of the device. Simultaneously, it buffers the rigid contact between the mounting plate 110 and the civil foundation 300, achieving vibration reduction, noise reduction, and stress dispersion during installation, thus preventing structural loosening and deformation after long-term operation.

[0055] In some embodiments, such as Figure 1 and Figure 2 As shown, the intelligent interception and backflow prevention device 100 also includes a drive actuator assembly 150, which includes a mounting bracket 151 and a drive actuator 152 fixed on the mounting bracket 151. The drive actuator 152 is used to drive the door panel 120 to rotate.

[0056] In this embodiment, the mounting bracket 151 is fixedly mounted on the mounting plate 110, and the drive actuator 152 is fixed to the mounting bracket 151 by bolts.

[0057] For example, in the direction of gravity, the mounting bracket 151 is located above the door panel 120, and the drive actuator 152 is a cylinder or hydraulic cylinder, with the piston rod of the drive actuator 152 contacting the top of the door panel 120. The upper-mounted layout of the mounting bracket 151 saves lateral space and is suitable for installation environments with narrow outlets; the use of a cylinder or hydraulic cylinder as a power source provides stable power and strong load capacity; the piston rod pushes against the top of the door panel 120, improving the smoothness and reliability of the opening and closing action.

[0058] For example, when there is no rain on a sunny day, the flow channel of pipe 200 needs to be closed. Under the combined action of its own weight and the drive actuator 152, the door plate 120 of the intelligent interception and backflow prevention device 100 flips to the closed and sealed position. At this time, the air bladder 140 rotates synchronously with the door plate into the first annular surface 113 of the second part 112 of the mounting plate 110. The control system inflates the air bladder 140 through the air nozzle 142, causing the air bladder to expand and fit against the first annular surface 113 and the second annular surface 131 to form a tight seal, thus achieving interception. After the air bladder 140 is fully inflated and a seal is established, the control system controls the drive actuator 152 to retract its piston rod into the cylinder. Because the air bladder expands and forms a large frictional resistance with the second annular surface 131, even if there is a certain level of water in the pipe 200, the door plate 120 can still remain reliably closed after the drive actuator 152 is reset and retracted, and will not open on its own. When it is necessary to open the pipeline for flood discharge during rainfall, the air bladder 140 is first depressurized and vented, and the air bladder contracts to release the sealing constraint; then, under the action of the water pressure upstream of the pipeline 200, the door panel 120 automatically flips open to ensure that the rainwater is discharged smoothly.

[0059] In some embodiments, such as Figure 1 and Figure 2 As shown, the top of the door panel 120 is provided with an arc-shaped top surface 124, which is used to contact the piston rod of the drive actuator 152.

[0060] In this embodiment, the top of the door panel 120 is provided with an arc-shaped top surface 124, which forms an arc-shaped contact with the piston rod of the drive actuator 152. The force distribution is uniform, which can effectively avoid stress concentration and opening and closing jamming, reduce the wear of parts, and improve the smoothness of opening and closing of the door panel 120 and the overall durability of the equipment.

[0061] In some embodiments, such as Figure 6 and Figure 7 As shown, the piston rod of the drive actuator 152 is connected to the door panel 120, and the piston rod of the drive actuator 152 is used to control the opening or closing of the door panel 120.

[0062] In this embodiment, the door panel 120 can be an arc-shaped door panel or a flat door panel, the principle is the same, and the following description takes the door panel 120 as a flat door panel as an example. The piston rod of the drive actuator 152 is connected to the door panel 120. For example, the door panel 120 is equipped with a bracket, and the piston rod of the drive actuator 152 is connected to the bracket of the door panel 120.

[0063] For example, when there is no rain on a sunny day, the flow channel of pipe 200 needs to be closed. Under the push of the piston rod of the drive actuator 152, the door plate 120 of the intelligent interception and backflow prevention device 100 flips to the closed and sealed position. At this time, the air bladder 140 rotates synchronously with the door plate into the first annular surface 113 position of the second part 112 of the mounting plate 110. The control system inflates the air bladder 140 through the air nozzle 142, causing the air bladder to expand and fit against the first annular surface 113 and the second annular surface 131 to form a tight seal, thus achieving interception. When it is necessary to open the pipe for flood discharge during rainfall, the air bladder 140 is first depressurized and vented, and the air bladder contracts to release the sealing constraint. Then, under the retraction of the piston rod of the drive actuator 152, the door plate 120 is driven to flip upward and open, ensuring that rainwater can be discharged smoothly.

[0064] It should be noted that this invention provides two door panel opening and closing schemes. The first scheme involves the piston rod of the drive actuator 152 contacting but not connecting to the door panel 120. The piston rod of the drive actuator 152 is used to close the door panel 120, while the upstream water pressure from the pipe 200 allows the door panel 120 to automatically flip open, ensuring smooth drainage of rainwater. The second scheme involves the piston rod of the drive actuator 152 being rotatably connected to the door panel 120. The extension of the piston rod of the drive actuator 152 closes the door panel 120, while the retraction of the piston rod opens the door panel 120, ensuring smooth drainage of rainwater.

[0065] This invention also provides an operation method 400 for an intelligent interception and backflow prevention device, applied to the aforementioned intelligent interception and backflow prevention device 100. The intelligent interception and backflow prevention device 100 includes a drive actuator assembly 150, such as... Figure 8 As shown, the operation method 400 includes: Step S410: When the pipe opening needs to be closed, control the piston rod of the drive actuator to extend and push the door plate so that the door plate rotates to the closed angle position.

[0066] Specifically, when the pipeline needs to be closed during sunny, rainless weather, the piston rod of the control actuator extends, and the door panel of the intelligent flow interception and backflow prevention device flips to a closed, sealed position under its own weight and the combined action of the drive actuator. The specific position can be determined, for example, by a tilt sensor. At this time, the air bladder rotates synchronously with the door panel into the first annular surface position of the second part of the mounting plate.

[0067] Step S420: Inflate the hollow inner cavity of the air bladder to inflate and seal the opening of the pipe.

[0068] Specifically, the inflation device inflates the air bladder through the air nozzle, causing the air bladder to expand and fit against the first and second annular surfaces to form a sealed blockage, thereby achieving flow interception.

[0069] In step S430, when the pipe opening needs to be reopened, the air bladder is depressurized and vented, and the piston rod of the drive actuator is retracted.

[0070] Specifically, in the case where the piston rod of the drive actuator 152 is in contact with but not connected to the door panel 120, after the air bladder is fully inflated and a seal is established, the control system controls the drive actuator to retract its piston rod into the cylinder. Because the inflated air bladder creates significant frictional resistance with the second annular surface 131, even if there is a certain level of water in the pipeline, the door panel will remain reliably closed after the drive actuator retracts and will not open on its own.

[0071] In this embodiment, a tiered control logic is adopted, which first mechanically closes the door, then inflates and seals it, and finally retracts the piston rod. This enables precise alignment and closure of the door panel, and the flexible expansion of the air bladder automatically compensates for assembly gaps, resulting in higher sealing reliability. After sealing is completed, the piston rod is retracted, eliminating the need for the actuator to withstand pressure and maintain its position for extended periods. This reduces energy consumption, minimizes component fatigue, and ensures long-term sealing stability.

[0072] Specifically, in the case where the piston rod of the drive actuator 152 is rotatably connected to the door panel 120, the air bladder 140 is first depressurized and vented, and the air bladder contracts to release the sealing constraint; then, as the piston rod of the drive actuator 152 retracts, it drives the door panel 120 to flip upward and open, ensuring that rainwater can be discharged smoothly.

[0073] In this embodiment, mechanical control is used to open or close the door panel 120, which can improve the flexibility of door panel 120 control and can flexibly realize pipeline drainage and pressure relief.

[0074] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An intelligent interception and backflow prevention device, characterized in that, include: Mounting plate, installed at the pipe opening and fixed to the civil engineering foundation; A door panel, rotatably connected to the mounting plate, is used to open or close the pipe opening; A circular cylinder is connected to the door panel, and its central axis can be parallel to the central axis of the pipe; An air bladder is fitted onto the outside of the annular cylinder. The air bladder has a hollow inner cavity and an air nozzle connected to the hollow inner cavity. The air nozzle is used to connect an external inflation device. The air bladder is inflated to seal the opening of the pipe.

2. The intelligent interception and backflow prevention device according to claim 1, characterized in that, The mounting plate includes a first part and a second part connected together. The first part is fixed to the civil engineering foundation, the second part is provided with a first annular surface, and the annular cylinder is provided with a second annular surface on the side facing away from the door panel. The air bladder is positioned between the first annular surface and the second annular surface, and the air bladder inflates to seal the gap between the first annular surface and the second annular surface.

3. The intelligent interception and backflow prevention device according to claim 2, characterized in that, The air bladder is fitted onto the second annular surface of the cylindrical shell and is fixedly connected to the second annular surface.

4. The intelligent interception and backflow prevention device according to claim 3, characterized in that, The hollow air bladder is a hollow rubber air bladder, and the hollow rubber air bladder is vulcanized and fixed to the second annular surface of the cylindrical ring.

5. The intelligent interception and backflow prevention device according to claim 3, characterized in that, The air bladder is a pre-formed hollow rubber air bladder, which is detachably installed on the second annular surface of the cylindrical ring.

6. The intelligent interception and backflow prevention device according to claim 1, characterized in that, The intelligent interception and backflow prevention device also includes a tilt sensor or a liquid level sensor. The tilt sensor is fixed on the door panel and is used to obtain the tilt angle of the door panel. The liquid level sensor is fixed on both sides of the door panel and is used to obtain the liquid level height inside and outside the pipe.

7. The intelligent interception and backflow prevention device according to claim 1, characterized in that, The intelligent interception and backflow prevention device also includes a drive actuator assembly, which includes a mounting bracket and a drive actuator fixed on the mounting bracket. The drive actuator is used to drive the door panel to rotate.

8. The intelligent interception and backflow prevention device according to claim 7, characterized in that, In the direction of gravity, the mounting bracket is located above the door panel, and the drive actuator is a cylinder or a hydraulic cylinder.

9. The intelligent interception and backflow prevention device according to claim 8, characterized in that, The piston rod of the drive actuator is connected to the door panel, and the piston rod of the drive actuator is used to control the opening or closing of the door panel.

10. A method for operating an intelligent backflow prevention device, applied to the intelligent backflow prevention device according to any one of claims 1-9, wherein the intelligent backflow prevention device includes a drive actuator assembly, characterized in that, The operation method includes: When the pipe opening needs to be closed, the piston rod of the control actuator extends to push the door plate, so that the door plate rotates to the closed angle position; Inflate the hollow inner cavity of the air bladder to inflate and seal the opening of the pipe; When the pipe opening needs to be reopened, the air bladder is depressurized and vented, and the piston rod of the drive actuator is retracted.

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