Anti-waterlogging drainage structure capable of filtering rainwater in multiple layers

Abstract

The invention relates to the technical field of anti-waterlogging drainage structures, and discloses an anti-waterlogging drainage structure for multi-layer filtration of rainwater, which comprises a drainage channel, a water collecting well, a primary filter well, a secondary filter well and a water storage tank. Rainwater flows into the drainage channel through the rainwater grate and then enters the water collecting well through the water collecting pipeline. And a water outlet is formed in the side part of the water collecting well. A rotating primary filter cartridge is arranged in the primary filter well and communicated with the water collecting well to primarily filter rainwater, and a primary water purification area is formed. A filter plate is arranged in the middle of the secondary filter well, the secondary filter well is divided into a secondary water purification area and a secondary filter area, the primary water purification area is communicated with the secondary filter area through a secondary pipeline, and rainwater is filtered again through the filter plate. The water storage tank is communicated with the secondary water purification area, and filtered rainwater flows into the water storage tank; after the rainwater is subjected to multi-layer filtration, fine particles, suspended solids and other impurities are removed, the quality of the rainwater is remarkably improved, the situation that the impurities enter municipal pipelines to cause blockage is effectively avoided, and pollution to follow-up water bodies is relieved.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-flood drainage structures, and more specifically, to an anti-flood drainage structure for multi-layer filtration of rainwater. Background Art

[0002] With the acceleration of the urbanization process, urban flood disasters occur frequently. High-intensity human activities have changed the urban terrain distribution, forming complex micro-topographies, which are prone to evolve into local depressions and become potential flood-prone locations.

[0003] Currently, in response to the problem of urban floods, rainwater filtration technology has been continuously developed. For example, there are flood drainage facilities on municipal roads that initially filter rainwater through a filter net and then discharge the accumulated water to the drainage ditch outside the road through a water outlet pipe.

[0004] In the prior art, due to the relatively few filtration levels, the filtration effect on complex and diverse rainwater impurities is limited. For example, only one or two layers of sieve meshes or filter nets are used for filtration, making it difficult to effectively remove fine particles, suspended solids, and dissolved pollutants in rainwater, resulting in poor quality of the filtered rainwater, which may cause blockage of municipal pipelines or pollution of subsequent water bodies.

[0005] Moreover, the filtration process of most prior arts is static, lacking dynamic filtration ability and unable to dynamically adjust filtration parameters according to the quality and flow rate of rainwater, thus unable to adapt to rainwater with different flow rates and qualities, reducing the filtration effect and efficiency. Summary of the Invention

[0006] The purpose of the present invention is to provide an anti-flood drainage structure for multi-layer filtration of rainwater, aiming to solve the problem that the anti-flood drainage structure in the prior art has relatively simple filtration of rainwater.

[0007] The present invention is implemented as follows: it includes a drainage channel, a longitudinally arranged catch well, a primary filtration well for initially filtering rainwater, a secondary filtration well for re-filtering the rainwater filtered by the primary filtration well, and a storage tank connected to the municipal pipeline; the top of the drainage channel has a top opening, and the top opening is covered with a rain grate. After the rain passes through the rain grate, it enters the drainage channel.

[0008] The drainage channel is connected to the catch well through a water collection pipe. The water collection pipe has a water outlet section extending into the catch well, and the water outlet section extends along the depth direction of the catch well; the bottom of the water outlet section is closed, and a side water outlet is formed on the outer periphery of the water outlet section, and the side water outlet extends along the height direction of the water outlet section.

[0009] A primary filter cylinder is rotatably arranged in the primary filter well. There is a primary water purification area between the outer periphery of the primary filter cylinder and the inner side wall of the primary filter well, and the primary water purification area is arranged to surround the outer periphery of the primary filter cylinder; the sump is communicated with the primary filter cylinder through a primary pipeline; the rainwater in the sump enters the primary filter cylinder through the primary pipeline, and the primary filter cylinder rotates synchronously to preliminarily filter the water flow in the primary filter cylinder and enter the primary water purification area;

[0010] A filter plate is arranged in the middle of the secondary filter well. The upper part of the secondary filter well forms a secondary water purification area above the filter plate, and the lower part of the secondary filter well forms a secondary filter area below the filter plate. The primary water purification area is communicated with the secondary filter area through a secondary pipeline; the rainwater in the primary water purification area enters the secondary filter area through the secondary pipeline, and after being filtered by the filter plate, it enters the secondary water purification area;

[0011] The water storage tank is communicated with the secondary water purification area through a water storage pipeline, and the rainwater in the secondary water purification area enters the water storage tank through a water outlet pipeline.

[0012] Further, a drain opening is arranged on the side of the drainage channel. One end of the water collection pipeline is communicated with the drain opening, and the other end of the water collection pipeline extends to the sump and is communicated with the sump; the drain opening is covered with a rotatably arranged and hemispherical rotating mesh layer. The outer periphery of the rotating mesh layer is rotatably connected to the drainage channel. The rotating mesh layer protrudes towards the drainage channel, and a plurality of rotating mesh holes are arranged in the rotating mesh layer.

[0013] Further, the rotating mesh layer is arranged in a ring shape. The outer periphery of the rotating mesh layer forms an outer ring part, and the outer ring part is arranged to surround the circumferential direction of the rotating mesh layer. The inner side of the rotating mesh layer is arranged in a hollow manner to form a hollow area, and the inner side of the rotating mesh layer has an inner ring part surrounding the outer periphery of the hollow area;

[0014] The hollow area is covered with an elastic rubber cover. The outer periphery of the rubber cover is rotatably connected to the inner ring part. The rubber cover protrudes towards the drainage channel, and a plurality of holes in the cover are arranged in the rubber cover.

[0015] Further, the diameter of the holes in the cover is smaller than the diameter of the rotating mesh holes.

[0016] Further, a plurality of bottom grooves are arranged at the bottom of the drainage channel. The plurality of bottom grooves extend along the flowing direction of the water flow in the drainage channel, and the top of the bottom groove has an opening at the bottom of the channel;

[0017] A plurality of elastic strips protrude from the bottom of the bottom groove. The bottom of the elastic strip is fixed to the bottom of the bottom groove, and the top of the elastic strip extends out of the bottom opening of the channel. Along the upward direction of the elastic strip, the elastic strip is bent away from the flowing direction of the water flow.

[0018] Furthermore, there is a water collection interval between the bottom of the water outlet section and the bottom of the sump. The middle part of the water outlet section has a plurality of elastic walls made of elastic material. The elastic walls are arranged along the axial direction of the water outlet section, and the plurality of elastic walls are arranged at intervals around the circumference of the water outlet section;

[0019] The side water outlets are formed between adjacent elastic walls. When the water flow in the water outlet section is discharged into the sump through the side water outlets, the side water outlets expand or contract synchronously with the water flow intensity.

[0020] Furthermore, a plurality of woven mesh layers are provided in the primary filter cylinder. The plurality of woven mesh layers are arranged at intervals along the height direction of the primary filter cylinder, and the outer periphery of the woven mesh layer is fixedly connected to the primary filter cylinder.

[0021] Furthermore, a counterweight is provided at the middle part of the woven mesh layer and hangs downward. The counterweight pulls the middle part of the woven mesh layer downward, so that the woven mesh layer forms a conical hopper shape, and the woven mesh layer encloses a mesh layer area with an open top.

[0022] Furthermore, a plurality of tracks protrude from the inner side wall of the secondary filter well. The plurality of tracks are arranged between the secondary filtration area and the secondary water purification area; the tracks are arranged along the axial direction of the secondary filter well, and the plurality of tracks are arranged at intervals around the circumference of the secondary filter well;

[0023] The outer periphery of the filter plate is movably connected to the plurality of tracks. When the water flow passes through the filter plate from the secondary filtration area and flows towards the secondary water purification area, the filter plate reciprocates up and down along the tracks.

[0024] Furthermore, a water level gauge is provided in the water storage tank. When the water level in the water storage tank exceeds the set water level, the water flow in the water storage tank is discharged into the municipal pipeline.

[0025] Compared with the prior art, the anti-infiltration and drainage structure for multi-layer filtration of rainwater provided by the present invention has the following structural advantages:

[0026] 1), The rainwater is first preliminarily filtered by the primary filter cylinder in the primary filter well to remove larger impurities; then it enters the secondary filter well and is filtered again by the filter plate to further remove fine particles, suspended substances and other impurities, significantly improving the quality of the filtered rainwater, effectively avoiding impurities from entering the municipal pipeline and causing blockage, and reducing the pollution to the subsequent water body;

[0027] 2) After the rainwater in the sump enters the primary filter cylinder, the primary filter cylinder rotates synchronously. The dynamic filtration method can better adapt to rainwater with different flow rates and water qualities, making the contact between the water flow and the filter cylinder more sufficient, improving the filtration efficiency, ensuring that the rainwater can be filtered and discharged in a timely and effective manner, and enhancing the drainage capacity of the anti-internal waterlogging drainage structure.

[0028] 3) In the secondary filter well, by setting a filter plate, the well is divided into a secondary water purification area and a secondary filtration area. After the rainwater in the primary water purification area enters the secondary filtration area through the secondary pipeline, it is filtered by the filter plate and then enters the secondary water purification area, realizing the zoned filtration of rainwater, optimizing the filtration process, making the filtration effect more stable and reliable, and further ensuring the water quality of the filtered rainwater. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic cross-sectional view of the anti-internal waterlogging drainage structure for multi-layer filtration of rainwater provided by the present invention;

[0030] Figure 2 is a schematic structural view of the rotating mesh layer provided by the present invention;

[0031] In the figure: drainage channel 100, grate 101, drainage outlet 102, rotating mesh layer 103, rotating mesh hole 104, outer ring part 105, hollow area 106, inner ring part 107, rubberized cover 108, cover middle hole 109, bottom groove 110, elastic strip 111, sump 200, water collection pipeline 201, water outlet section 202, water collection interval 203, elastic wall 204, side water outlet 205, primary filter well 300, primary filter cylinder 301, primary water purification area 302, primary pipeline 303, woven mesh layer 304, counterweight 305, secondary filter well 400, filter plate 401, secondary water purification area 402, secondary filtration area 403, secondary pipeline 404, track 405, water storage tank 406, water storage pipeline 407, water level gauge 408. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present 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 only used to explain the present invention and are not used to limit the present invention.

[0033] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0034] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] Refer to Figure 1-2 As shown, it is a preferred embodiment provided by the present invention.

[0036] An anti-waterlogging drainage structure for multi-layer filtration of rainwater, including a drainage channel 100, a longitudinally arranged catch well 200, a primary filtration well 300 for initially filtering rainwater, a secondary filtration well 400 for re-filtering the rainwater filtered by the primary filtration well 300, and a water storage tank 406 communicated with a municipal pipeline; the top of the drainage channel 100 has a top opening, and the top opening is covered with a rain grate 101. After the rain passes through the rain grate 101, it enters the drainage channel 100.

[0037] The drainage channel 100 is communicated with the catch well 200 through a water collection pipe 201. The water collection pipe 201 has a water outlet section 202 extending into the catch well 200, and the water outlet section 202 is arranged along the depth direction of the catch well 200; the bottom of the water outlet section 202 is closed, and a side water outlet 205 is formed on the outer periphery of the water outlet section 202, and the side water outlet 205 is arranged along the height direction of the water outlet section 202.

[0038] A rotatably arranged primary filter cylinder 301 is provided in the primary filtration well 300. There is a primary purified water area 302 between the outer periphery of the primary filter cylinder 301 and the inner side wall of the primary filtration well 300, and the primary purified water area 302 is arranged around the outer periphery of the primary filter cylinder 301; the catch well 200 is communicated with the primary filter cylinder 301 through a primary pipe 303; the rainwater in the catch well 200 enters the primary filter cylinder 301 through the primary pipe 303, and the primary filter cylinder 301 rotates synchronously to initially filter the water flow in the primary filter cylinder 301 and enter the primary purified water area 302.

[0039] A filter plate 401 is provided in the middle of the secondary filter well 400. An upper part of the secondary filter well 400 forms a secondary purified water area 402 above the filter plate 401, and a lower part of the secondary filter well 400 forms a secondary filtration area 403 below the filter plate 401. The primary purified water area 302 is communicated with the secondary filtration area 403 through a secondary pipeline 404; rainwater in the primary purified water area 302 enters the secondary filtration area 403 through the secondary pipeline 404, and after being filtered by the filter plate 401, it enters the secondary purified water area 402;

[0040] The water storage tank 406 is communicated with the secondary purified water area 402 through a water storage pipeline 407, and rainwater in the secondary purified water area 402 enters the water storage tank 406 through a water outlet pipeline.

[0041] The provided anti-waterlogging drainage structure for multi-layer filtration of rainwater has the following structural advantages:

[0042] 1). Rainwater is first preliminarily filtered through the primary filter cylinder 301 in the primary filter well 300 to remove larger impurities; then it enters the secondary filter well 400 and is filtered again through the filter plate 401 to further remove fine particles, suspended matters and other impurities, significantly improving the quality of the filtered rainwater, effectively preventing impurities from entering the municipal pipeline and causing blockage, and reducing the pollution to the subsequent water body;

[0043] 2). After the rainwater in the catch well 200 enters the primary filter cylinder 301, the primary filter cylinder 301 rotates synchronously. The dynamic filtration method can better adapt to rainwater with different flow rates and water qualities, making the contact between the water flow and the filter cylinder more sufficient, improving the filtration efficiency, ensuring that the rainwater can be filtered and discharged in a timely and effective manner, and enhancing the drainage capacity of the anti-waterlogging drainage structure;

[0044] 3). In the secondary filter well 400, the well is divided into a secondary purified water area 402 and a secondary filtration area 403 by setting the filter plate 401. After the rainwater in the primary purified water area 302 enters the secondary filtration area 403 through the secondary pipeline 404, it is filtered by the filter plate 401 and then enters the secondary purified water area 402, realizing the zoned filtration of rainwater, optimizing the filtration process, making the filtration effect more stable and reliable, and further ensuring the quality of the filtered rainwater.

[0045] In this embodiment, a drain outlet 102 is provided on the side of the drainage channel 100. One end of the water collection pipeline 201 is communicated with the drain outlet 102, and the other end of the water collection pipeline 201 extends to the catch well 200 and is communicated with the catch well 200; the drain outlet 102 is covered with a rotating net layer 103 arranged in a rotating manner and in a hemispherical shape. The outer periphery of the rotating net layer 103 is rotatably connected to the drainage channel 100. The rotating net layer 103 protrudes towards the drainage channel 100, and a plurality of rotating mesh holes 104 are provided in the rotating net layer 103.

[0046] By using the rotating mesh layer 103, when rainwater enters the drainage channel 100, it can be preliminarily filtered through the rotating mesh holes 104 to intercept larger impurities and prevent them from entering the interior of the drainage channel 100, reducing the burden on the subsequent filtration system. At the same time, the hemispherical structure and rotational connection mode of the rotating mesh layer 103 can effectively prevent impurities from accumulating on the surface of the mesh layer and causing blockage, keep the mesh holes unobstructed, and improve the filtration efficiency.

[0047] In this embodiment, the rotating mesh layer 103 is arranged in a ring shape. An outer ring part 105 is formed on the outer periphery of the rotating mesh layer 103. The outer ring part 105 is arranged along the circumferential direction of the rotating mesh layer 103. The inner side of the rotating mesh layer 103 is arranged in a hollowed-out manner to form a hollowed-out area 106. An inner ring part 107 surrounding the outer periphery of the hollowed-out area 106 is provided on the inner side of the rotating mesh layer 103;

[0048] The hollowed-out area 106 is covered with an elastic rubber cover 108. The outer periphery of the rubber cover 108 is rotationally connected to the inner ring part 107. The rubber cover 108 protrudes towards the drainage channel 100. A plurality of holes 109 are provided in the rubber cover 108.

[0049] Through the setting of the rubber cover 108, the rainwater entering the hollowed-out area 106 is further filtered. The elastic material and rotational connection mode of the rubber cover 108 can enable the holes 109 to flexibly adjust the opening and closing degree under the action of water flow, adapt to rainwater with different flow rates, enhance the flexibility and adaptability of filtration, and effectively intercept finer impurities at the same time, improving the filtration accuracy.

[0050] In this embodiment, the diameter of the holes 109 is smaller than the diameter of the rotating mesh holes 104. In this way, a multi-stage filtration aperture is formed, enabling the rainwater to be preliminarily filtered through the larger rotating mesh holes 104 first and then more finely filtered through the smaller holes 109, further improving the filtration effect, removing more impurities, ensuring better water quality of the rainwater entering the drainage channel 100, and laying a good foundation for the subsequent multi-layer filtration.

[0051] In this embodiment, a plurality of bottom grooves 110 are provided at the bottom of the drainage channel 100. The plurality of bottom grooves 110 extend along the flowing direction of the water flow in the drainage channel 100. The top of the bottom groove 110 has an opening at the bottom of the channel;

[0052] A plurality of elastic strips 111 protrude from the bottom of the bottom groove 110. The bottom of the elastic strip 111 is fixed to the bottom of the bottom groove 110. The top of the elastic strip 111 extends out of the opening at the bottom of the channel; Along the direction from bottom to top of the elastic strip 111, the elastic strip 111 is bent away from the flowing direction of the water flow.

[0053] Through the settings of the bottom groove 110 and the elastic strip 111, the water flow at the bottom of the drainage channel 100 can be disturbed and guided, so that the water flow forms a vortex in the bottom groove 110, enhancing the mixing of the water flow and the suspension of impurities, facilitating the interception of impurities by the subsequent filtering structure. At the same time, the curved arrangement of the elastic strip 111 can generate a certain resistance and buffering effect on the water flow, slowing down the water flow speed and further improving the filtering effect.

[0054] In this embodiment, there is a water collection interval 203 between the bottom of the water outlet section 202 and the bottom of the sump 200. The middle part of the water outlet section 202 has a plurality of elastic walls 204 made of elastic material. The elastic walls 204 are arranged along the axial direction of the water outlet section 202, and the plurality of elastic walls 204 are arranged at intervals around the circumference of the water outlet section 202.

[0055] Side outlet openings 205 are formed between adjacent elastic walls 204. When the water flow in the water outlet section 202 is discharged to the sump 200 through the side outlet openings 205, the side outlet openings 205 expand or contract synchronously with the water flow intensity.

[0056] In this way, the water outlet section 202 has an adaptive adjustment function, automatically adjusting the size of the outlet according to the water flow intensity. When the water flow intensity is large, the side outlet openings 205 expand to accelerate the drainage speed; when the water flow intensity is small, the side outlet openings 205 contract to slow down the drainage speed. At the same time, the elastic walls 204 can also play a certain buffering and rectifying role on the water flow, enabling the water flow to enter the sump 200 more smoothly and improving the collection efficiency and filtering stability of the sump 200.

[0057] In this embodiment, a plurality of woven mesh layers 304 are provided in the primary filter cylinder 301. The plurality of woven mesh layers 304 are arranged at intervals along the height direction of the primary filter cylinder 301, and the outer periphery of the woven mesh layer 304 is fixedly connected to the primary filter cylinder 301.

[0058] In this way, the filtering levels and filtering area of the primary filter cylinder 301 are increased, enabling the rainwater to be intercepted and filtered multiple times in the primary filter cylinder 301, effectively removing more impurities, improving the effect of primary filtration, providing better water inlet conditions for the subsequent secondary filtration, and further enhancing the filtering performance of the entire anti - waterlogging drainage structure.

[0059] In this embodiment, a counterweight 305 that hangs downward is provided in the middle of the woven mesh layer 304. The counterweight 305 pulls the middle part of the woven mesh layer 304 downward, so that the woven mesh layer 304 forms a conical hopper shape, and the woven mesh layer 304 surrounds and forms a mesh layer area with an open top.

[0060] Taking advantage of the conical hopper-shaped feature is conducive to the rapid collection and downward flow of rainwater in the woven mesh layer 304. At the same time, the conical hopper shape can increase the contact area between rainwater and the woven mesh layer 304, improve the filtration efficiency, and the design of the top opening facilitates the smooth entry of rainwater into the woven mesh layer 304 for filtration, ensuring the efficient operation of the primary filter cylinder 301.

[0061] In this embodiment, a plurality of tracks 405 are convexly provided on the inner sidewall of the secondary filter well 400. The plurality of tracks 405 are arranged between the secondary filtration area 403 and the secondary purified water area 402; the tracks 405 extend along the axial direction of the secondary filter well 400, and the plurality of tracks 405 are arranged at intervals along the circumferential direction of the secondary filter well 400;

[0062] The outer periphery of the filter plate 401 is movably connected to the plurality of tracks 405. When the water flow passes through the filter plate 401 from the secondary filtration area 403 and flows towards the secondary purified water area 402, the filter plate 401 reciprocates up and down along the tracks 405.

[0063] Through the movable connection between the tracks 405 and the filter plate 401, the filter plate 401 can reciprocate up and down along the tracks 405 under the action of water flow. This dynamic filtration method can make the filter plate 401 fully contact with the water flow, enhance the filtration effect. At the same time, the movement of the filter plate 401 can also play a certain stirring role, prevent impurities from accumulating on the surface of the filter plate 401, maintain the filtration performance of the filter plate 401, and further improve the efficiency and quality of secondary filtration.

[0064] In this embodiment, a water level gauge 408 is provided in the water storage tank 406. When the water level in the water storage tank 406 exceeds the set water level, the water flow in the water storage tank 406 is discharged into the municipal pipeline.

[0065] The setting of the water level gauge 408 can monitor the water level in the water storage tank 406 in real time. When the water level reaches the set height, the water flow is timely discharged into the municipal pipeline to avoid overflow of the water storage tank 406, ensure the normal operation of the entire anti-infiltration drainage structure and the stability of the urban drainage system, and at the same time is conducive to the reasonable allocation of water resources and the improvement of water resource utilization efficiency.

[0066] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-layer rainwater filtration anti-flooding drainage structure, characterized in that: It includes a drainage channel, a longitudinally arranged water collection well, a primary filtering well for preliminary filtering of rainwater, a secondary filtering well for re-filtering rainwater filtered by the primary filtering well, and a water storage tank connected to a municipal pipeline; the top of the drainage channel has a top opening, the top opening is covered with a rainwater grate, and rainwater enters the drainage channel after passing through the rainwater grate; The drainage channel is connected to the water collection well through a water collection pipe, and the water collection pipe has a water outlet section extending into the water collection well, and the water outlet section is arranged along the depth direction of the water collection well; the bottom of the water outlet section is arranged closed, and the outer periphery of the water outlet section is formed with a side water outlet, and the side water outlet is arranged along the height direction of the water outlet section; The primary filter well is provided with a primary filter cartridge which is arranged in a rotating manner. A primary water purification zone is provided between the outer periphery of the primary filter cartridge and the inner side wall of the primary filter well. The primary water purification zone is arranged around the outer periphery of the primary filter cartridge. The water collection well is connected with the primary filter cartridge through a primary pipeline. Rainwater in the water collection well enters the primary filter cartridge through the primary pipeline. The primary filter cartridge rotates synchronously to preliminarily filter the water flow in the primary filter cartridge and enter the primary water purification zone. A filter plate is provided in the middle of the secondary filter well, the upper part of the secondary filter well forms a secondary water purification area located above the filter plate, the lower part of the secondary filter well forms a secondary filtration area located below the filter plate, and the primary water purification area is connected with the secondary filtration area through a secondary pipeline; rainwater in the primary water purification area enters the secondary filtration area through the secondary pipeline, and enters the secondary water purification area after being filtered by the filter plate; The water storage tank is connected with the secondary water purification area through a water storage pipe, and rainwater in the secondary water purification area enters the water storage tank through a water outlet pipe.

2. The anti-flooding drainage structure for multi-layer filtration of rainwater according to claim 1, characterized in that: A drain outlet is provided on the side of the drainage channel, one end of the water collecting pipe is connected to the drain outlet, and the other end of the water collecting pipe extends to the water collecting well and is connected to the water collecting well; the drain outlet cover is provided with a rotating mesh layer which is arranged in a rotating manner and is hemispherical, the outer periphery of the rotating mesh layer is rotationally connected to the drainage channel, the rotating mesh layer is arranged to protrude toward the drainage channel, and a plurality of rotating mesh holes are provided in the rotating mesh layer.

3. The anti-flooding drainage structure for multi-layer filtration of rainwater as claimed in claim 2, characterized in that: The rotating mesh layer is arranged in a ring shape, the outer circumference of the rotating mesh layer forms an outer ring portion, the outer ring portion is arranged around the circumference of the rotating mesh layer, the inner side of the rotating mesh layer is hollowed out to form a hollow area, and the inner side of the rotating mesh layer has an inner ring portion surrounding the outer circumference of the hollow area; The hollow area is covered with an elastic colloid cover, the outer periphery of the colloid cover is rotatably connected with the inner ring part, the colloid cover is arranged to protrude toward the drainage channel, and a plurality of cover holes are arranged in the colloid cover.

4. The anti-flooding drainage structure for multi-layer filtration of rainwater as claimed in claim 3, characterized in that: The diameter of the hole in the cover is smaller than the diameter of the rotating mesh.

5. The anti-flooding drainage structure for multi-layer filtration of rainwater according to any one of claims 1 to 4, characterized in that: The bottom of the drainage channel is provided with a plurality of bottom grooves, the plurality of bottom grooves are extended and arranged along the flow direction of water in the drainage channel, and the top of the bottom groove has a channel bottom opening; A plurality of elastic strips are protruding from the bottom of the bottom groove, the bottom of the elastic strips is fixed to the bottom of the bottom groove, and the top of the elastic strips extends out of the channel bottom opening; Along the direction from bottom to top of the elastic strip, the elastic strip is bent away from the flow direction of the water flow.

6. The anti-flooding drainage structure for multi-layer filtration of rainwater according to any one of claims 1 to 4, characterized in that: There is a water collection gap between the bottom of the water outlet section and the bottom of the water collection well, and the middle of the water outlet section has a plurality of elastic walls made of elastic material, the elastic walls are arranged along the axial direction of the water outlet section, and the plurality of elastic walls are arranged around the circumference of the water outlet section at intervals; The side water outlets are formed between adjacent elastic walls. When the water in the water outlet section is discharged to the water collection well through the side water outlets, the side water outlets expand or contract synchronously with the water flow intensity.

7. The anti-flooding drainage structure for multi-layer filtration of rainwater according to any one of claims 1 to 4, characterized in that: A plurality of woven mesh layers are arranged in the primary filter cartridge, and the plurality of woven mesh layers are arranged at intervals along the height direction of the primary filter cartridge, and the outer periphery of the woven mesh layer is fixedly connected to the primary filter cartridge.

8. The anti-flooding drainage structure for multi-layer filtration of rainwater as claimed in claim 7, characterized in that: A downwardly suspended counterweight is provided in the middle of the woven mesh layer, and the counterweight pulls the middle of the woven mesh layer downward to form a cone shape of the woven mesh layer, and the woven mesh layer surrounds a mesh layer area with a top opening.

9. The anti-flooding drainage structure for multi-layer filtration of rainwater according to any one of claims 1 to 4, characterized in that: A plurality of tracks are convexly provided on the inner side wall of the secondary filtration well, and the plurality of tracks are arranged between the secondary filtration area and the secondary water purification area; the tracks are arranged along the axial extension of the secondary filtration well, and the plurality of tracks are arranged at intervals along the circumference of the secondary filtration well; The outer periphery of the filter plate is movably connected to a plurality of tracks. When the water flows from the secondary filter area through the filter plate and flows toward the secondary water purification area, the filter plate reciprocates up and down along the track.

10. The anti-flooding drainage structure for multi-layer filtration of rainwater according to any one of claims 1 to 4, characterized in that: A water level gauge is provided in the water tank. When the water level in the water tank exceeds a set water level, the water in the water tank is discharged into the municipal pipeline.

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