Fabricated municipal rainwater and sewage backflow prevention drainage well structure and control method thereof

Abstract

The invention relates to the technical field of drainage wells, in particular to an assembly type municipal rainwater and sewage backflow prevention drainage well structure and a control method thereof.The assembly type municipal rainwater and sewage backflow prevention drainage well structure comprises a shaft and a pipe-middle-sized backflow prevention device installed in the shaft, and the pipe-middle-sized backflow prevention device comprises a shell and a membrane flap installed in the shell; a control mechanism for assisting the closing of the membrane flap is arranged in the shell; the control mechanism comprises a first adjusting assembly arranged on the inner side of the bottom of the shell, a water outlet of the elastic pipe which is draining is pressed through the membrane flap closing action in the later period of pipeline drainage, and a bottom membrane flap closing area is scoured. The opening of the water inlet of the elastic pipe is controlled by the movable baffle which automatically changes the state according to the water flow, and the elastic pipe is extruded by matching with the action of closing the membrane flap of the pipe-middle type anti-backflow device, so that the purpose of reducing the sectional area of the water outlet of the elastic pipe is achieved, and part of pressure energy is converted into kinetic energy of water, thereby achieving the effect of accelerating the flow speed. Before the membrane flaps are completely closed, the closed area is scoured through rapid water flow, and the impurity retention risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of drainage well technology, specifically to a prefabricated municipal stormwater and sewage backflow prevention drainage well structure and its control method. Background Technology

[0002] Municipal drainage systems are engineering facilities that treat and remove urban sewage and rainwater. They are a core component of modern urban infrastructure, and their design must consider multiple objectives, including flood control and drainage, backflow prevention, water resource recycling, and intelligent management. Under a separate sewage and rainwater system, sewage is collected through drainage pipes, sent to a sewage treatment plant, and then discharged into water bodies or recycled. Rainwater runoff is collected through drainage pipes and discharged into nearby water bodies.

[0003] The existing in-pipe built-in anti-backflow device is an automatic anti-backflow device specifically designed for urban drainage systems. It is installed directly inside the pipe and requires no external power source to achieve unidirectional flow of sewage and rainwater and prevent backflow. Its main components are a stainless steel shell and an eccentrically conical synthetic rubber diaphragm. When the water pressure inside the pipe is greater than the external pressure, the water flow opens the diaphragm, forming a high-speed jet that is discharged, simultaneously cleaning deposits on the pipe wall. When the external water level rises or the backflow pressure increases, the diaphragm, under the reverse back pressure and its own elasticity, tightly adheres to the pipe wall, achieving a zero-leakage seal. However, in practical applications, in the later stages of drainage, the water flow decreases and the velocity slows down, causing the diaphragm to close. Simultaneously, the water flow carries debris into the drainage pipe... Because the outlet is close to the diaphragm, there is a possibility that debris may be trapped in the diaphragm valve's closure area before being discharged, causing the valve to fail to close completely and leaving tiny gaps. External water bodies (such as rivers or elevated sewage pipes) can continuously seep into the pipe under pressure differences, increasing the load on the pipe network. Continuous leakage causes water flow to repeatedly impact the edge of the diaphragm valve, leading to rubber fatigue deformation or fabric layer peeling. Slight insufficiency may develop into moderate closure failure, potentially diluting the sewage concentration, affecting downstream treatment efficiency, and causing pipeline flow overload, exacerbating the risk of manhole overflow. At the same time, the gaps become retention points for silt and fibrous debris, gradually forming a core blockage that may eventually completely hinder the diaphragm valve's movement and accelerate the siltation rate in the sedimentation tank.

[0004] Therefore, the present invention provides a prefabricated municipal stormwater and sewage backflow prevention drainage well structure and its control method for removing debris from the membrane flap closure area when the water flow velocity decreases in the later stage of drainage and avoiding affecting the closure of the membrane flap. Summary of the Invention

[0005] To address the problem in existing technologies where debris may accumulate in the membrane flap closure area during the later stages of drainage, potentially leading to incomplete closure of the membrane flap, this invention provides a prefabricated municipal stormwater and sewage backflow prevention drainage well structure and its control method.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a prefabricated municipal stormwater and sewage backflow prevention drainage well structure and its control method, including a well cylinder and a pipe-type backflow prevention device installed inside it. The pipe-type backflow prevention device includes a shell and a diaphragm valve installed inside the shell. An auxiliary diaphragm valve closing control mechanism is provided inside the shell. The control mechanism includes a first adjustment component located on the inner side of the bottom of the housing. The first adjustment component includes a movable baffle that can automatically adjust its state according to the water flow rate and has a reset function, and an elastic tube that cooperates with it. When the water flow rate in the pipe is high, the movable baffle rotates downstream to press the inlet of the elastic tube that can rebound. When the water flow rate in the pipe is low, the movable baffle resets to intercept debris, and at the same time, the inlet of the elastic tube rebounds and resets, allowing water to enter the elastic tube and exit from the outlet of the elastic tube. The action of the membrane flap closing in the later stage of pipe drainage presses down the outlet of the elastic tube that is draining, reducing the cross-sectional area of ​​the outlet and increasing the water flow velocity to flush the bottom membrane flap closing area.

[0007] Preferably, the bottom of the elastic tube is fixedly connected to the bottom of the shell, and the width of the inlet is greater than the width of the outlet.

[0008] Preferably, the first adjustment component further includes a ramp fixedly connected to the bottom of the inner wall of the housing, a connecting sleeve fixedly connected to the bottom of the movable baffle, the connecting sleeve being rotatably connected to the high part of the ramp, a fixed shaft being rotatably connected inside the connecting sleeve, both ends of the fixed shaft being fixedly connected to the ramp, and torsion springs being respectively provided at both ends of the fixed shaft, one end of the torsion spring being fixedly connected to the connecting sleeve, and the other end being fixedly connected to the ramp.

[0009] Preferably, the movable baffle is arc-shaped and has a through groove in the middle, with the width of the through groove gradually increasing from the bottom to the top of the movable baffle.

[0010] Preferably, the diaphragm flap includes an eccentric cone-shaped first rubber member and a second rubber member fixedly connected to the first rubber member, the second rubber member being used for sealing with the housing.

[0011] Preferably, an inspection well is fixedly connected to the end of the well shaft away from the water outlet, a base is provided at the bottom of the outer surface of the well shaft, and a filter element is fixedly installed inside the end of the well shaft near the inspection well.

[0012] Preferably, the control mechanism further includes a second adjustment component disposed at the bottom of the first rubber component. The second adjustment component includes an elastic filter plate and connecting rods fixedly connected to both ends of the top of the elastic filter plate. The end of the connecting rod away from the elastic filter plate is hinged to the first rubber component.

[0013] Preferably, the bottom of the elastic filter plate is arc-shaped, and the elastic filter plate includes a solid part and a filtration part, with the filtration part located in the middle section of the elastic filter plate.

[0014] Preferably, the bottom density of the filter section of the elastic filter plate is greater than the top density.

[0015] Preferably, a control method for a prefabricated municipal stormwater and sewage backflow prevention drainage well structure is applicable to the prefabricated municipal stormwater and sewage backflow prevention drainage well structure as described in any one of claims 1 to 6, and the control method includes: When the water flow in the well is large in the early stage of drainage, the movable baffle flips under the impact of the water flow and presses down the inlet of the elastic tube; When the water flow decreases in the later stage of drainage, the movable baffle resets, and the water flows into the elastic tube; During the closure of the diaphragm flap, its bottom presses against the outlet of the elastic tube that is draining water, reducing the cross-sectional area of ​​the outlet, increasing the water flow velocity, and flushing the closed area at the bottom of the diaphragm flap.

[0016] The beneficial effects of this invention are: (1) The prefabricated municipal stormwater and sewage backflow prevention drainage well structure and its control method described in this invention control the opening of the inlet of the elastic tube by an active baffle that automatically changes its state according to the water flow rate, and squeezes the elastic tube when the membrane flap of the tube-type backflow prevention device closes, thereby reducing the cross-sectional area of ​​the outlet of the elastic tube, so that the local pressure is reduced and some pressure energy is converted into the kinetic energy of the water, thereby achieving the effect of increasing the flow rate. Before the membrane flap is completely closed, the closed area is flushed by a rapid water flow to reduce the risk of debris retention.

[0017] (2) The prefabricated municipal stormwater and sewage backflow prevention drainage well structure and its control method described in this invention have a movable baffle that changes its shape according to the size of the water flow. When facing a large water flow, the movable baffle rotates under impact and presses down on the inlet of the elastic tube, so as to prevent the water flow from continuously impacting the upper unfixed part of the elastic tube when the flow rate is large. When the water flow decreases, the movable baffle resets and can also serve as another filter element to further intercept debris from entering the elastic tube. During the membrane flap closure process, the debris is reduced to approach the membrane flap closure area.

[0018] (3) The prefabricated municipal rainwater and sewage backflow prevention drainage well structure and its control method described in this invention are designed with the through groove on the movable baffle being wider at the top and narrower at the bottom. When the movable baffle is rotated by the impact of water flow, if there are debris stuck at the lower end of the through groove, the debris will move to the wider end of the through groove under the impact of water flow, reducing the risk of the through groove getting stuck. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 A schematic diagram of the structure of the well shaft, filter element, and in-pipe anti-backflow device provided by the present invention; Figure 3A schematic diagram showing the connection between the first adjustment component and the pipe-type anti-backflow device provided by the present invention; Figure 4 A second schematic diagram showing the connection between the first adjustment component and the in-pipe anti-backflow device provided by the present invention; Figure 5 A schematic diagram from three angles showing the connection between the first adjustment component and the pipe-type anti-backflow device provided by the present invention; Figure 6 A schematic diagram showing the connection between the elastic tube and the in-tube anti-backflow device provided by the present invention; Figure 7 A schematic diagram of the structure of the first adjustment component provided by the present invention; Figure 8 This is a schematic diagram showing the connection between the second adjustment component and the in-pipe anti-backflow device provided by the present invention; Figure 9 This is a schematic diagram of the structure of the second adjustment component provided by the present invention.

[0021] In the diagram: 1. Inspection well; 2. Well shaft; 3. Base; 4. Filter element; 5. Pipe-type anti-backflow device; 51. Shell; 52. Diaphragm flap; 521. First rubber component; 522. Second rubber component; 6. First adjustment assembly; 61. Slope; 62. Movable baffle; 621. Through groove; 63. Connecting sleeve; 64. Fixed shaft; 65. Torsion spring; 66. Elastic tube; 8. Second adjustment assembly; 81. Connecting rod; 82. Elastic filter plate; 821. Solid part; 822. Filter part. Detailed Implementation

[0022] To make the technical means, creative features, objectives, and effects of this invention easier to understand, the invention is further described below in conjunction with specific embodiments. Example 1: As... Figures 1-8 As shown, the present invention discloses a prefabricated municipal stormwater and sewage backflow prevention drainage well structure and its control method, comprising a well shaft 2 and a pipe-type backflow prevention device 5 installed inside it. The pipe-type backflow prevention device 5 includes a housing 51 and a diaphragm flap 52 installed inside the housing 51. A control mechanism for assisting the closure of the diaphragm flap 52 is provided inside the housing 51. The control mechanism includes a first adjustment component 6 disposed on the inner side of the bottom of the housing 51. The first adjustment component 6 includes a movable baffle 62 that can automatically adjust its state according to the water flow rate and has a reset function. The flexible tube 66 works in conjunction with it. When the water flow in the pipe is large, the movable baffle 62 rotates downstream to press down the inlet of the elastic tube 66. When the water flow in the pipe is small, the movable baffle 62 resets to intercept debris. At the same time, the inlet of the elastic tube 66 resets, and the water flows into the elastic tube 66 and is discharged from the outlet of the elastic tube 66. The action of the membrane flap 52 closing in the later stage of pipe drainage presses down the outlet of the elastic tube 66 that is draining, reducing the cross-sectional area of ​​the outlet and increasing the water flow velocity to flush the closed area of ​​the bottom membrane flap 52.

[0023] In this embodiment, during municipal drainage, water flows through a drainage pipe assembled from a manhole 2, a manhole 1, and a base 3, and finally enters the manhole 2 equipped with a pipe-mounted anti-backflow device 5. First, it is filtered by the filter element 4 to intercept larger debris. Using the first adjusting component 6 in conjunction with the pipe-mounted anti-backflow device 5, when drainage is not in progress, the movable baffle 62 is initially in a vertically upward state, and the inlet of the elastic pipe 66 is naturally open. During the initial drainage phase, when the water flow is large, impacting the movable baffle 62 causes it to rotate downstream, thus pressing down the inlet of the elastic pipe 66. At this time, most of the drainage water flows through the elastic pipe 66. The water flows over the top of 6, opening the membrane flap 52. The water flows out from below the membrane flap 52. When the water flow decreases in the later stage of drainage, the movable baffle 62 begins to reset under the action of the torsion spring 65. After resetting, the movable baffle 62 can further intercept debris, and the water flow can also flow to the elastic tube 66 through the channel 621. Most of the water flow in the later stage of drainage is concentrated and discharged through the elastic tube 66. At the same time, the membrane flap 52 begins to close due to the decrease in water flow in the later stage of drainage. When the bottom of the membrane flap 52 moves down, it squeezes the outlet of the elastic tube 66, thereby reducing the cross-sectional area of ​​the outlet of the elastic tube 66, increasing the water flow velocity, and enhancing the flushing force on the debris in the closed area of ​​the membrane flap 52.

[0024] Specifically, such as Figures 2-7 As shown, a manhole 1 is fixedly connected to the end of the well shaft 2 away from the outlet. A base 3 is provided at the bottom of the outer surface of the well shaft 2. A filter element 4 is fixedly installed inside the end of the well shaft 2 near the manhole 1. The first adjustment component 6 also includes a ramp 61 fixedly connected to the bottom of the inner wall of the housing 51. A connecting sleeve 63 is fixedly connected to the bottom of the movable baffle 62. The connecting sleeve 63 is rotatably connected to the high part of the ramp 61. A fixed shaft 64 is rotatably connected inside the connecting sleeve 63. Both ends of the fixed shaft 64 are fixedly connected to the ramp 61. Torsion springs 65 are provided at both ends of the fixed shaft 64. One end of the torsion spring 65 is fixedly connected to the connecting sleeve 63, and the other end is fixedly connected to the ramp 61. The movable baffle 62 is arc-shaped and has a through groove 621 in the middle. The width of the through groove 621 gradually increases from the bottom to the top of the movable baffle 62.

[0025] In this embodiment, during drainage, large debris in the water flow is filtered out by the filter element 4 before impacting the movable baffle 62. The filter element 4 needs to be cleaned regularly. In the early stage of drainage, the water flow is relatively large, and the water flow impacts the movable baffle 62. The movable baffle 62 only has a through groove 621 in the middle position, and no slots are opened at both ends. Therefore, when the water flow is large, it is conducive to the rotation of the movable baffle 62. The slope 61 upstream of the movable baffle 62 has a small slope, so it does not affect the water flow when the water flow is large. The movable baffle 62 is rotated by the impact of the water flow. At this time, the movable baffle 62 and the connecting sleeve 63 rotate synchronously, causing the torsion springs 65 at both ends of the connecting sleeve 63 to deform. The connecting sleeve 63 and the slope 61 are sealed. After the movable baffle 62 rotates, it presses down on the inlet of the elastic tube 66. A large amount of water flows open the membrane flap 52, and the rubber at the bottom of the membrane flap 52 deforms. The water flows out by bending upwards. When the water flow decreases in the later stage of drainage, the force exerted by the water flow on the movable baffle 62 is insufficient to keep the movable baffle 62 in its rotated shape. The torsion spring 65 gradually twists the deformation through elastic restoring force, causing the movable baffle 62 to rotate towards the initial position. At this time, the ramp 61 works with the movable baffle 62 to intercept the debris that has not been filtered out by the filter element 4. At the same time, because the water flow decreases and the flow speed slows down, most of the heavier debris in the water flow is in the lower part of the water flow. Even if the narrow part at the bottom of the channel 621 is blocked by debris, the water flow can still pass through the upper end of the channel 621 and enter the elastic tube 66. When the movable baffle 62 is reset, the debris stuck there because the movable baffle 62 rotates and presses against the inlet of the elastic tube 66 can also be washed away by the water flow when the movable baffle 62 is reset and the inlet of the elastic tube 66 begins to rebound.

[0026] In this embodiment, as Figure 7 As shown, the width of the channel 621 gradually increases from bottom to top. After the movable baffle 62 rotates under the impact of the water flow, the wider end is located downstream of the water flow. If there are blocky debris stuck at the lower end of the channel 621 before the movable baffle 62 rotates, the water flow will impact the debris in the wider direction after rotation. After the debris moves to the wider part, it moves with the water flow, making it less likely for the lower end of the channel 621 to be stuck by debris, thus reducing the impact of the movable baffle 62 on the water flow after it is reset.

[0027] Specifically, such as Figure 5 and Figure 6 As shown, the bottom of the elastic tube 66 is fixedly connected to the bottom of the housing 51, and the width of the inlet is greater than the width of the outlet; the membrane flap 52 includes an eccentric cone-shaped first rubber component 521 and a second rubber component 522 fixedly connected to the first rubber component 521, and the second rubber component 522 is used to close and seal with the housing 51.

[0028] In this embodiment, when the movable baffle 62 resets due to a decrease in water flow and a slowdown in flow velocity, the outlet of the elastic tube 66 rebounds to the open state after being pressed by the movable baffle 62. Water flows through the through groove 621 and into the elastic tube 66. The lower half of the movable baffle 62 and the elastic tube 66 are fixedly connected to the bottom of the housing 51, while the upper half can undergo a certain deformation. After the movable baffle 62 resets, the water flow passes through the middle of the movable baffle 62, with most of the water flowing into the elastic tube 66. Since the outlet of the elastic tube 66 is smaller than the inlet of the elastic tube 66, when the water flows out from the outlet, the upper half of the outlet is... The opening is expanded, increasing the height of the outlet. At this time, the flow rate of drainage in the well 2 has decreased, and the bottom of the anti-backflow device's diaphragm flap 52 begins to move down and reset. The first rubber part 521 of the diaphragm flap 52 is an eccentric cone. The diaphragm flap 52 is relatively heavy. When the diaphragm flap 52 moves down and is not closed, the bottom of the larger diameter end of the first rubber part 521 presses against the outlet of the expanded elastic tube 66 that is draining water, causing the cross-sectional area of ​​the outlet of the elastic tube 66 to shrink. The reduction in cross-sectional area leads to a decrease in local pressure, and some pressure energy is converted into the kinetic energy of water, which manifests as an increase in flow velocity, flushing the closed area of ​​the anti-backflow device and accelerating the movement of debris.

[0029] Example 2: Basically similar to Example 1, except that... Figure 8 and Figure 9 As shown, a second embodiment of the control mechanism is described. The control mechanism further includes a second adjustment component 8 disposed at the bottom of the first rubber component 521. The second adjustment component 8 includes an elastic filter plate 82 and connecting rods 81 fixedly connected to both ends of the top of the elastic filter plate 82. The end of the connecting rod 81 away from the elastic filter plate 82 is hinged to the first rubber component 521. The bottom of the elastic filter plate 82 is arc-shaped. The elastic filter plate 82 includes a solid part 821 and a filtering part 822. The filtering part 822 is located in the middle section of the elastic filter plate 82. The bottom density of the filtering part 822 of the elastic filter plate 82 is greater than the top density.

[0030] In this embodiment, the second adjustment component 8 at the bottom of the first rubber part 521 of the membrane flap 52 is used to delay the closing speed of the membrane flap 52 when it is about to close. The two ends of the elastic filter plate 82 are solid parts 821, which are relatively heavy and also need to be cleaned regularly. When the water flow is small, the bottom can move closer to the bottom of the housing 51 due to its own weight. When the water flow is large in the early stage of drainage, the water flow will push the membrane flap 52 open, and the membrane flap 52 will drive the elastic filter plate 82 to move, so that the bottom of the elastic filter plate 82 separates from the bottom of the housing 51. The top is connected to the membrane flap 52 by a connecting rod 81. The bottom is in a suspended state at this time. Under the impact of the water flow, the lower end of the elastic filter plate 82 will shift towards the downstream direction of drainage. When the water flow decreases and the flow rate slows down, the membrane flap 52, which was originally impacted by the large water flow, will move further. The deformed bottom rubber begins to recover, causing the bottom of the elastic filter plate 82 to move closer to the bottom of the housing 51 until it contacts it, intercepting the impurities that the filter element 4 has not filtered out. The bottom of the elastic filter plate 82 is arc-shaped, and water can flow through the upper and lower ends of the filter section 822 of the elastic filter plate 82. When the water flows through the narrow gap at the bottom of the membrane flap 52, the flow velocity increases, resulting in a decrease in local pressure. The low-pressure area below the membrane flap 52 and the normal pressure area above it form a pressure difference, which may generate a downward suction force. As the bottom of the membrane flap 52 continues to move downward, the elastic filter plate 82 is gradually compressed. During this process, the closing speed of the membrane flap 52 is slowed down by the elastic filter plate 82, prolonging the closing time. This time is used to flush the impurities located on the downstream side of the elastic filter plate 82 out of the well barrel 2, reducing the probability of jamming.

[0031] Working principle: During the initial drainage phase, the water flow is relatively large. After passing through the filter element 4, the larger impurities are filtered out, which then pushes open the membrane flap 52 of the pipe-type anti-backflow device 5. Simultaneously, the water impacts the first regulating component 6. Under the impact of the water flow, the movable baffle 62 rotates downstream. The two torsion springs 65 at the bottom of the movable baffle 62 deform, and after the movable baffle 62 rotates, it presses against the inlet of the elastic tube 66, making the inlet nearly closed. In the later stage of drainage, when the water flow decreases and the flow rate slows down, the torsion springs 65 below the movable baffle 62 twist through elastic restoring force, causing the movable baffle 62 to rotate upstream. This causes the inlet of the elastic tube 66 to spring back, and when the movable baffle 62 resets, it further intercepts debris in the water flow. Most of the water flow enters the elastic tube 66 and is discharged from the outlet of the elastic tube 66, which opens the outlet. At this time, the diaphragm flap 52 begins to close due to the reduced water flow. The diaphragm flap 52 moves downward toward the bottom of the shell 51 and first comes into contact with the outlet of the elastic tube 66. Under the pressure of the diaphragm flap 52, the outlet of the elastic tube 66 is compressed, which reduces the cross-sectional area of ​​the outlet and increases the flow velocity. When the diaphragm flap 52 is not closed, it flushes the closed area and accelerates the discharge of debris, thus avoiding affecting the closure of the diaphragm flap 52.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An assembled municipal rain and sewage anti-inversion drainage well structure, comprising a well shaft and a pipe-in-pipe anti-inversion device installed inside the well shaft, the pipe-in-pipe anti-inversion device comprising a shell and a membrane flap installed inside the shell, characterized in that: The control mechanism is arranged inside the shell to assist the closing of the membrane flap. ​ The control mechanism comprises a first adjusting assembly arranged inside the bottom of the shell, the first adjusting assembly comprising a movable baffle capable of automatically adjusting according to the water flow and having a reset function, and an elastic pipe matched with the movable baffle, when the water flow in the pipe is large, the movable baffle rotates in the downstream direction and presses the water inlet of the elastic pipe, when the water flow in the pipe is small, the movable baffle resets to intercept sundries, at the same time, the water inlet of the elastic pipe resets, the water flow enters the elastic pipe and is discharged from the water outlet of the elastic pipe, the movable baffle uses the closing action of the membrane flap in the later stage of pipe drainage to press the water outlet of the elastic pipe which is discharging water, shrinks the cross-sectional area of the water outlet, and increases the water flow velocity to flush the bottom membrane flap closing area.

2. The assembled municipal rainwater and sewage anti-backflow drainage well structure according to claim 1, characterized in that: The bottom of the elastic pipe is fixedly connected with the bottom of the shell, and the width of the water inlet is larger than the width of the water outlet.

3. The assembled municipal rainwater and sewage anti-backflow drainage well structure according to claim 2, characterized in that: The first adjusting assembly further comprises a slope fixedly connected with the inner wall bottom of the shell, the movable baffle is fixedly connected with a connecting sleeve, the connecting sleeve is rotationally connected with the high position of the slope, a fixed shaft is rotationally connected in the connecting sleeve, the two ends of the fixed shaft are fixedly connected with the slope, torsional springs are arranged at the two ends of the fixed shaft respectively, one end of each torsional spring is fixedly connected with the connecting sleeve, and the other end is fixedly connected with the slope.

4. The assembled municipal rainwater and sewage anti-backflow drainage well structure according to claim 3, characterized in that: The movable baffle is arranged in an arc shape and a through slot is arranged in the middle part of the movable baffle, and the width of the through slot gradually increases from the bottom to the top of the movable baffle.

5. The assembled municipal rainwater and sewage anti-backflow drainage well structure according to claim 1, characterized in that: The membrane flap comprises a first rubber part in the shape of an eccentric cone and a second rubber part fixedly connected with the first rubber part, and the second rubber part is used for sealing with the shell.

6. The assembled municipal rainwater and sewage anti-backflow drainage well structure according to claim 1, characterized in that: The one end of the well shaft away from the water outlet is fixedly connected with an inspection well, a base is arranged at the bottom of the outer surface of the well shaft, and a filter part is fixedly installed inside the one end of the well shaft close to the inspection well.

7. The assembled municipal rainwater and sewage anti-backflow drainage well structure according to claim 6, characterized in that: The control mechanism further comprises a second adjusting assembly arranged at the bottom of the first rubber part, the second adjusting assembly comprising an elastic filter plate and connecting rods fixedly connected with the two ends of the top of the elastic filter plate respectively, and the one end of each connecting rod away from the elastic filter plate is hingedly connected with the first rubber part.

8. The assembled municipal rainwater and sewage anti-backflow drainage well structure according to claim 7, characterized in that: The bottom of the elastic filter plate is arranged in an arc shape, the elastic filter plate comprises a solid part and a filter part, and the filter part is located in the middle section of the elastic filter plate.

9. The prefabricated municipal rainwater and sewage anti-backflow drainage well structure according to claim 8, characterized in that: The density of the bottom of the filter part of the elastic filter plate is larger than the density of the top.

10. A control method of the assembled municipal rainwater and sewage anti-backflow drainage well structure, suitable for the assembled municipal rainwater and sewage anti-backflow drainage well structure according to any one of claims 1 to 6, characterized in that: The control method comprises: When the water flow in the well shaft is large in the early stage of drainage, the movable baffle is flipped under the impact of the water flow and presses the water inlet of the elastic pipe; When the water flow is small in the later stage of drainage, the movable baffle resets, and the water flow enters the elastic pipe; In the closing process of the membrane flap, the bottom of the membrane flap presses the water outlet of the elastic pipe which is discharging water, reduces the cross-sectional area of the water outlet, increases the water flow velocity, and flushes the bottom closing area of the membrane flap.

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