Sponge city rainwater treatment device

Abstract

The application discloses a sponge city rainwater treatment device, and relates to the field of rainwater treatment technology, which comprises a rainwater pool, an inspection well and a water inlet pipe, the rainwater pool is a buried structure, a water inlet is formed in the top wall of the rainwater pool, the inspection well is located above the rainwater pool and communicates with the water inlet, the water inlet pipe communicates with the inspection well and is used for leading rainwater into the inspection well, a cover plate for covering and sealing the water inlet is arranged on the top of the rainwater pool, the cover plate is lower than the port of the water inlet pipe close to the inspection well, the cover plate is located in the inspection well, the cover plate is provided with a water-absorbing resin cotton bag, when the water-absorbing resin cotton bag absorbs water and expands, the water-absorbing resin cotton bag forces the cover plate to move upwards and away from the edge of the water inlet.

Description

Technical Field

[0001] This application relates to the field of rainwater treatment technology, and in particular to a rainwater treatment device for sponge cities. Background Technology

[0002] Sponge city, a new generation of urban stormwater management concept, refers to a city's ability to adapt to environmental changes and cope with natural disasters caused by rainwater, much like a sponge. It can also be called a "water-resilient city." The internationally accepted term for this ability is "low-impact development stormwater system construction." When it rains, the system absorbs, stores, infiltrates, and purifies water, releasing and utilizing the stored water when needed, allowing rainwater to migrate freely within the city.

[0003] The water storage function of a sponge city involves setting up water tanks that can collect rainwater. The rainwater stored in the tanks can be used for watering urban green plants or for sweeping and cleaning roads.

[0004] Because urban roads contain a large amount of dust from vehicle exhaust and often have significant oil residue, the initial rainwater runoff during urban rainfall often contains substantial pollutants. When sponge cities incorporate rainwater harvesting ponds, these initial pollutants can enter the ponds, making it difficult to guarantee the water quality within them. Summary of the Invention

[0005] In order to reduce the amount of pollutants from urban roads entering rainwater storage ponds, this application provides a sponge city rainwater treatment device.

[0006] The sponge city rainwater treatment device provided in this application adopts the following technical solution: A sponge city rainwater treatment device includes a rainwater pool, an inspection well, and an inlet pipe. The rainwater pool is a buried structure with an inlet on its top wall. The inspection well is located above the rainwater pool and communicates with the inlet. The inlet pipe communicates with the inspection well and is used to introduce rainwater into the inspection well. The top of the rainwater pool is provided with a cover plate for covering and sealing the inlet. The cover plate is lower than the port of the inlet pipe near the inspection well and is located inside the inspection well. The cover plate is provided with absorbent resin cotton pads. When the absorbent resin cotton pads absorb water and expand, they force the cover plate to move upward away from the edge of the inlet.

[0007] By adopting the above technical solution, during rainfall, rainwater can flow through the inlet pipe to the inspection well. At this time, the inlet connected to the inspection well is blocked by a cover plate. The rainwater in the inspection well presses the cover plate tightly against the edge of the inlet, making it difficult for rainwater to enter the rainwater tank in the initial stage of rainfall. As the absorbent resin cotton pack absorbs water and expands, it can push the cover plate away from the edge of the inlet, allowing rainwater to enter the rainwater tank. The absorbent resin cotton pack requires a certain amount of time to absorb water and expand, thus providing rainwater with time to wash away pollutants, reducing the amount of pollutants entering the rainwater tank subsequently, and improving the water quality in the rainwater tank.

[0008] Optionally, at least two absorbent resin cotton bags are provided, with the two absorbent resin cotton bags located on both sides of the water inlet; the absorbent resin cotton bags are located below the cover plate, and the top of the rainwater pool is provided with multiple mounting slots for correspondingly accommodating the absorbent resin cotton bags, with the mounting slots partially located outside the coverage area of ​​the cover plate.

[0009] By adopting the above technical solution, the water-absorbing resin cotton pack is installed in the installation groove, and the installation groove is located outside the coverage area of ​​the cover plate, so that the rainwater entering the inspection well can fully contact the water-absorbing resin cotton pack.

[0010] Optionally, the top of the rainwater pool has an annular protrusion along the edge of the inlet, and the lower surface of the main body of the cover plate abuts against the annular protrusion; the top of the rainwater pool is provided with a hinge seat, which is horizontally offset from the annular protrusion, and the cover plate is hinged to the hinge seat; the absorbent resin cotton pack is located on the upper surface of the cover plate and is away from the annular protrusion relative to the hinge seat; the top of the rainwater pool is provided with a blocking member, which includes a connecting part and a blocking part. The connecting part is connected to the top of the rainwater pool, and the blocking part is located above the absorbent resin cotton pack. When the absorbent resin cotton pack absorbs water and expands, the absorbent resin cotton pack exerts an upward thrust on the blocking part.

[0011] By adopting the above technical solution, when the absorbent resin cotton bag absorbs water and expands, it exerts an upward pushing force on the blocking part of the blocking component. Simultaneously, the blocking part exerts a downward pushing force on the absorbent resin cotton bag and the cover plate away from the annular protrusion, causing the side of the cover plate away from the annular protrusion to move downwards, while simultaneously causing the portion of the cover plate above the annular protrusion to tilt upwards, thus exposing the inlet and allowing rainwater to enter the rainwater tank. The absorbent resin cotton bag moves the cover plate using a lever mechanism, and since the main body of the cover plate is located above the annular protrusion, the absorbent resin cotton bag can move the cover plate a relatively large distance with a small amount of expansion and deformation, which helps to increase the speed at which rainwater enters the rainwater tank.

[0012] Optionally, the upper surface of the cover plate is provided with an installation assembly for installing the absorbent resin cotton pack. The installation assembly includes an installation post and an installation cover. One end of the installation post is vertically fixedly connected to the cover plate. The installation cover is slidably connected to the installation post along the height direction of the installation post. The top wall of the installation cover is provided with several through holes. An installation cavity for accommodating the absorbent resin cotton pack is formed between the installation cover and the installation post.

[0013] By adopting the above technical solution, the absorbent resin cotton pack is installed in the mounting cavity between the mounting column and the mounting cover. When rainwater enters the inspection well, it flows through the through hole onto the absorbent resin cotton pack, causing the pack to absorb water and expand. This expansion pushes the mounting cover upwards, creating an upward thrust on the blocking part of the blocking component. Installing the absorbent resin cotton pack within the mounting cavity of the mounting assembly reduces the likelihood of rainwater erosion of the pack, protecting it and helping to maintain its stable position.

[0014] Optionally, the top surface of the mounting column is provided with several height adjustment shims.

[0015] By adopting the above technical solution, and by setting a height adjustment shim on the top surface of the mounting column, the distance between the mounting cover and the blocking part can be adjusted, thereby controlling the waiting time for the absorbent resin cotton pack to push the cover plate as needed.

[0016] Optionally, the bottom surface of the rainwater pool is set as a slope, and a pump pit is recessed on the lower side of the bottom surface of the rainwater pool for installing a water pump.

[0017] By adopting the above technical solution, when pumping and utilizing rainwater in the rainwater tank, the rainwater at the bottom of the rainwater tank can flow along the bottom surface of the rainwater tank into the pump pit, which helps to drain the rainwater in the rainwater tank as much as possible.

[0018] Optionally, the top of the rainwater pool is provided with multiple ventilation pipes; the top of the ventilation pipes is provided with rainwater caps, and the rainwater caps are surrounded by insect-proof nets.

[0019] By adopting the above technical solution and setting up multiple ventilation pipes, air convection between the rainwater tank and the outside environment can be created, reducing the growth of anaerobic bacteria in the rainwater tank and thus reducing the odor of the tank water. Rain caps and insect nets can prevent garbage and insects from entering the rainwater tank.

[0020] Optionally, the upper end of the vent pipe is higher than the wellhead of the inspection well; a traction rope is pulled on the side of the cover plate away from the absorbent resin cotton pack, and the well wall of the inspection well is provided with a binding device for tying the traction rope.

[0021] By employing the above technical solution, the cover plate can be moved away from the annular protrusion by a traction rope, exposing the inlet and allowing manual control of the cover plate's opening and closing. When the cover plate is open, the traction rope is secured to the binding, keeping the inlet exposed. Simultaneously, the inspection well is opened. Because the well opening is lower than the top of each ventilator, the ventilator can draw air out of the rainwater tank through the chimney effect. At the same time, outside air enters the rainwater tank through the inspection well and inlet, thus accelerating air convection within the tank. After the rainwater in the tank is drained, ventilation through the ventilator and inspection well ensures the tank remains dry, killing microorganisms and maintaining its cleanliness.

[0022] Optionally, a filter element is provided at one end of the water inlet pipe near the inspection well. The filter element includes an outer frame and a filter screen. The filter screen is fixed inside the outer frame, and the outer peripheral surface of the outer frame is adapted to the inner peripheral surface of the water inlet pipe. The filter screen is inclined, and the surface of the filter screen away from the inspection well is inclined downward. Multiple limiting members are inserted into the inner wall of the water inlet pipe, and the limiting members are located on the side of the filter element near the inspection well.

[0023] By adopting the above technical solution, when rainwater enters the rainwater tank through the inlet pipe, it is filtered by the filter element, whose filter screen can filter impurities from the rainwater. The side of the filter screen away from the inspection well is tilted downwards. When impurities adhere to this side of the filter screen, they are more likely to fall off under gravity, thus helping to keep the filter screen clean. The filter element is installed inside the inlet pipe by an outer frame. The outer circumference of the outer frame matches the inner circumference of the inlet pipe, which keeps the filter element in a tilted state, preventing it from tipping over. The limiting component on the inner wall of the inlet pipe can limit the filter element, preventing rainwater from pushing it from the inlet pipe into the inspection well.

[0024] Optionally, an oil-blocking cable is provided inside the water inlet pipe, and the oil-blocking cable is located on the side of the filter element away from the inspection well.

[0025] By adopting the above technical solution, the oil boom can intercept oil pollution in rainwater, which helps to protect the water quality in the rainwater tank. The oil boom is installed in the inlet pipe, and the filter element ensures that the oil boom is kept inside the inlet pipe.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. During rainfall, rainwater flows through the inlet pipe to the inspection well. At this time, the inlet connected to the inspection well is blocked by a cover, making it difficult for rainwater to enter the rainwater tank in the initial stages of rainfall. As the absorbent resin pads absorb water and expand, they push the cover away from the edge of the inlet, allowing rainwater to enter the rainwater tank. The expansion of the absorbent resin pads takes time, providing the rainwater with time to flush away pollutants, thus reducing the amount of pollutants entering the rainwater tank later.

[0027] 2. After the rainwater in the rainwater tank is drained, ventilation pipes and inspection wells are used to ventilate the rainwater tank, which can dry the rainwater tank and kill the microorganisms in the rainwater tank, thus helping to keep the rainwater tank clean. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0029] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0030] Figure 3 yes Figure 1 A magnified view of a portion of point B in the middle.

[0031] Figure 4 This is a schematic diagram of the overall structure of Example 2.

[0032] Explanation of reference numerals in the attached figures: 1. Rainwater pool; 11. Inlet; 12. Cover plate; 121. Absorbent resin cotton pack; 13. Pump pit; 14. Water pump; 15. Annular protrusion; 16. Hinge seat; 17. Mounting assembly; 171. Mounting column; 172. Mounting cover; 1721. Through hole; 173. Mounting cavity; 174. Height adjustment shim; 18. Blocking component; 181. Connecting part; 182. Blocking part; 19. Mounting groove; 2. Inspection well; 21. Well cover; 3. Inlet pipe; 4. Filter component; 41. Outer frame; 42. Filter screen; 43. Limiting component; 5. Oil boom; 6. Ventilation pipe; 61. Rain cap; 62. Insect net; 7. Traction rope; 71. Binding component. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0034] Example 1 This application discloses a rainwater treatment device for sponge cities. (Refer to...) Figure 1 and Figure 2The sponge city rainwater treatment device includes a rainwater pool 1, an inspection well 2, and an inlet pipe 3. The rainwater pool 1 is a buried structure, and an inlet 11 is opened on the top wall of the rainwater pool 1. The inspection well 2 is located above the rainwater pool 1 and is connected to the inlet 11. The inspection well 2 is equipped with a manhole cover 21. The inlet pipe 3 is connected to the inspection well 2. The end of the inlet pipe 3 away from the inspection well 2 is connected to the infiltration pipe of the sponge city road or to the rainwater well of the municipal road.

[0035] The top of the rainwater tank 1 is provided with a cover plate 12 for covering and sealing the inlet 11. The cover plate 12 is lower than the port of the inlet pipe 3 near the inspection well 2. The cover plate 12 is located inside the inspection well 2. The cover plate 12 is provided with a water-absorbing resin cotton pack 121, which contains water-absorbing resin material. When the water-absorbing resin cotton pack 121 absorbs water and expands, it forces the cover plate 12 to move upward away from the edge of the inlet 11.

[0036] During rainfall, rainwater flows through the inlet pipe 3 into the inspection well 2 and remains within it due to the obstruction of the cover plate 12. As the absorbent resin cotton pack 121 absorbs water and expands, it pushes the cover plate 12 away from the edge of the inlet 11, allowing rainwater to enter the rainwater pool 1. The absorption and expansion of the absorbent resin cotton pack 121 takes a certain amount of time, providing the rainwater with time to wash away pollutants, thus reducing the amount of pollutants entering the rainwater pool 1 and improving the water quality in the rainwater pool 1.

[0037] Reference Figure 1 The bottom surface of the rainwater tank 1 is sloped, and a pump pit 13 is recessed on the lower side of the bottom surface of the rainwater tank 1. The pump pit 13 is used to install a water pump 14. The outlet pipe of the water pump 14 passes through the top wall of the rainwater tank 1 and connects to the irrigation facilities of the urban green area. The rainwater in the rainwater tank 1 flows into the pump pit 13 at an angle along the bottom surface of the rainwater tank 1, so that the rainwater in the rainwater tank 1 can be drained as much as possible.

[0038] Reference Figure 2 The top of the rainwater pool 1 has an annular protrusion 15 along the edge of the inlet 11, and the lower surface of the main body of the cover plate 12 abuts against the annular protrusion 15; the top of the rainwater pool 1 is provided with a hinge seat 16, which is located outside the annular protrusion 15 and is offset from the annular protrusion 15 in the horizontal direction, and the cover plate 12 is hinged to the hinge seat 16.

[0039] Reference Figure 2The upper surface of the cover plate 12 is provided with a mounting assembly 17 for mounting the absorbent resin cotton pack 121. The mounting assembly 17 is away from the annular protrusion 15 relative to the hinge seat 16. The mounting assembly 17 includes a mounting post 171 and a mounting cover 172. One end of the mounting post 171 is vertically fixedly connected to the cover plate 12. The mounting cover 172 is slidably connected to the mounting post 171 along the height direction of the mounting post 171. The top wall of the mounting cover 172 is provided with a plurality of through holes 1721. The mounting cover 172 and the mounting post 171 form a mounting cavity 173 for accommodating the absorbent resin cotton pack 121.

[0040] The top of the rainwater pool 1 is provided with a blocking member 18, which includes a connecting part 181 and a blocking part 182. The connecting part 181 is connected to the top of the rainwater pool 1, and the blocking part 182 is fixed to the side of the connecting part 181. The blocking part 182 extends horizontally to the top of the mounting member. When the water-absorbing resin cotton pack 121 absorbs water and expands, the water-absorbing resin cotton pack 121 can generate an upward thrust on the blocking part 182.

[0041] When rainwater enters the inspection well 2, it enters the inner side of the mounting cavity 173 through the through hole 1721, causing the water-absorbing resin cotton pack 121 in the mounting cavity 173 to absorb water and expand. After the water-absorbing resin cotton pack 121 expands, it pushes the mounting cover 172 upward, so that the mounting cover 172 forms an upward thrust on the blocking part 182. Correspondingly, the blocking part 182 forms a downward thrust on the side of the cover plate 12 away from the annular protrusion 15 through the mounting part and the water-absorbing resin cotton pack 121, so that the part of the cover plate 12 located on the annular protrusion 15 tilts upward and moves away from the annular protrusion 15, allowing rainwater to enter the rainwater pool 1 from the inlet 11.

[0042] Referring to Figure 2, the top surface of the mounting post 171 is provided with several height adjustment shims 174. By setting the height adjustment shims 174, the distance between the mounting cover 172 and the blocking part 182 can be adjusted, thereby controlling the waiting time for the absorbent resin cotton pack 121 to push the cover plate 12 as needed.

[0043] Reference Figure 3 A filter element 4 is provided at one end of the inlet pipe 3 near the inspection well 2. The filter element 4 includes an outer frame 41 and a filter screen 42. The filter screen 42 is fixed inside the outer frame 41 and can filter impurities in rainwater. The outer circumferential surface of the outer frame 41 is adapted to the inner circumferential surface of the inlet pipe 3. Both the outer circumferential surface of the outer frame 41 and the inner circumferential surface of the inlet pipe 3 are cylindrical surfaces. The outer circumferential surface of the outer frame 41 is coated with a rubber layer, and the outer frame 41 abuts against the inner circumferential surface of the inlet pipe 3 through the rubber layer. Multiple limiting members 43 are inserted into the inner wall of the inlet pipe 3. The limiting members 43 are rods and are located on the side of the filter element 4 near the inspection well 2. The limiting members 43 can keep the filter element 4 inside the inlet pipe 3.

[0044] Reference Figure 3The filter screen 42 is tilted, with the surface of the filter screen 42 away from the inspection well 2 tilted downwards. When impurities in the rainwater adhere to the side of the filter screen 42 away from the inspection well 2, the impurities are easily dislodged by gravity, which helps to keep the filter screen 42 clean.

[0045] Reference Figure 4 An oil-blocking cable 5 is installed inside the rainwater pipe, located on the side of the filter element 4 away from the inspection well 2. The oil-blocking cable 5 can intercept oil in the rainwater, which helps improve the quality of rainwater in the rainwater pool 1.

[0046] Reference Figure 1 The top of the rainwater tank 1 is equipped with multiple ventilation pipes 6, each with a different height. Each ventilation pipe 6 has a rain cap 61 at its top, surrounded by an insect-proof net 62. The upper end of the ventilation pipe 6 is higher than the opening of the inspection well 2. A traction rope 7 is attached to the side of the cover plate 12 away from the absorbent resin cotton pack 121. The well wall of the inspection well 2 is equipped with a binding device 71 for securing the traction rope 7. The binding device 71 can be a hook or screw embedded in the well wall of the inspection well 2.

[0047] After the rainwater in the rainwater tank 1 is drained, and with the manhole cover 21 of the inspection well 2 removed, the cover plate 12 can be lifted using the traction rope 7 to separate it from the annular protrusion 15. Then, the traction rope 7 is tied to the binding piece 71, keeping the inlet 11 exposed. Ventilation of the rainwater tank 1 via the ventilation pipe 6 and the inspection well 2 allows the rainwater tank 1 to reach a dry state, thus killing microorganisms within it and helping to keep the rainwater tank 1 clean. During the ventilation process using the ventilation pipe 6 and the inspection well 2, the ventilation pipe 6 creates a chimney effect, enabling rapid convection ventilation between the rainwater tank 1 and the outside environment.

[0048] The implementation principle of a sponge city rainwater treatment device according to an embodiment of this application is as follows: During rainfall, rainwater flows through the inlet pipe 3 to the inspection well 2. After the rainwater enters the inspection well 2, it presses the cover plate 12 tightly against the edge of the inlet 11, making it difficult for the rainwater to enter the rainwater pool 1 in the early stages of rainfall. As the absorbent resin cotton pack 121 absorbs water and expands, it can push the cover plate 12 away from the edge of the inlet 11, allowing the rainwater to enter the rainwater pool 1. The absorbent resin cotton pack 121 needs a certain amount of time to absorb water and expand, thus providing time for the rainwater to wash away pollutants, reducing the amount of pollutants entering the rainwater pool 1 subsequently, and improving the water quality in the rainwater pool 1. In addition, the rainwater is also filtered by the filter element 4 and the oil barrier 5 during its flow through the inlet pipe 3.

[0049] Example 2 The difference between this embodiment and embodiment 1 is that the way the cover plate 12 covers the water inlet 11 is different in this embodiment than in embodiment 1. In this embodiment, the annular protrusion 15 is not provided, and the lower surface of the cover plate 12 directly abuts the edge of the water inlet 11.

[0050] Reference Figure 4 In this embodiment, two water-absorbing resin cotton bags 121 are provided, and the two water-absorbing resin cotton bags 121 are located on both sides of the water inlet 11 respectively. The water-absorbing resin cotton bags 121 are located below the cover plate 12. The top of the rainwater pool 1 is provided with two mounting grooves 19 for respectively accommodating the water-absorbing resin cotton bags 121. The mounting grooves 19 are partially located outside the coverage area of ​​the cover plate 12.

[0051] The water-absorbing resin cotton pack 121 is installed in the mounting groove 19. The mounting groove 19 is partially outside the coverage area of ​​the cover plate 12, so that the rainwater entering the inspection well 2 can fully contact the water-absorbing resin cotton pack 121. When the water-absorbing resin cotton pack 121 absorbs water and expands, it can lift the cover plate 12 upward, so that the rainwater can enter the rainwater pool 1.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rainwater treatment device for sponge cities, characterized in that, The rainwater pool (1), inspection well (2), and inlet pipe (3) are included. The rainwater pool (1) is a buried structure. An inlet (11) is provided on the top wall of the rainwater pool (1). The inspection well (2) is located above the rainwater pool (1) and is connected to the inlet (11). The inlet pipe (3) is connected to the inspection well (2) and is used to introduce rainwater into the inspection well (2). The top of the rainwater pool (1) is provided with a cover for sealing. A cover plate (12) is placed over the inlet (11). The cover plate (12) is lower than the port of the inlet pipe (3) near the inspection well (2). The cover plate (12) is located inside the inspection well (2). The cover plate (12) is provided with a water-absorbing resin cotton pack (121). When the water-absorbing resin cotton pack (121) absorbs water and expands, the water-absorbing resin cotton pack (121) forces the cover plate (12) to move upward away from the edge of the inlet (11). The rainwater pool (1) has an annular protrusion (15) at the top along the edge of the inlet (11), and the lower surface of the main body of the cover plate (12) abuts against the annular protrusion (15); the top of the rainwater pool (1) is provided with a hinge seat (16), the hinge seat (16) and the annular protrusion (15) are offset in the horizontal direction, and the cover plate (12) is hinged to the hinge seat (16); the absorbent resin cotton pack (121) is located on the upper surface of the cover plate (12) and is opposite to the hinge. The seat (16) is away from the annular protrusion (15). The top of the rainwater pool (1) is provided with a blocking member (18). The blocking member (18) includes a connecting part (181) and a blocking part (182). The connecting part (181) is connected to the top of the rainwater pool (1). The blocking part (182) is located above the absorbent resin cotton pack (121). When the absorbent resin cotton pack (121) absorbs water and expands, the absorbent resin cotton pack (121) forms an upward thrust on the blocking part (182). The upper surface of the cover plate (12) is provided with an installation assembly (17) for installing the absorbent resin cotton pack (121). The installation assembly (17) includes an installation post (171) and an installation cover (172). One end of the installation post (171) is vertically fixedly connected to the cover plate (12). The installation cover (172) and the installation post (171) are slidably connected along the height direction of the installation post (171). The top wall of the installation cover (172) is provided with several through holes (1721). An installation cavity (173) for accommodating the absorbent resin cotton pack (121) is formed between the installation cover (172) and the installation post (171).

2. The sponge city rainwater treatment device according to claim 1, characterized in that: At least two absorbent resin cotton bags (121) are provided, with the two absorbent resin cotton bags (121) located on both sides of the water inlet (11); the absorbent resin cotton bags (121) are located below the cover plate (12), and the top of the rainwater pool (1) is provided with multiple mounting grooves (19) for correspondingly accommodating the absorbent resin cotton bags (121), and the mounting grooves (19) are partially located outside the coverage area of ​​the cover plate (12).

3. The sponge city rainwater treatment device according to claim 1, characterized in that: The top surface of the mounting post (171) is provided with several height adjustment shims (174).

4. A sponge city rainwater treatment device according to claim 1, characterized in that: The bottom surface of the rainwater pool (1) is set as an inclined surface, and a pump pit (13) is provided on the lower side of the bottom surface of the rainwater pool (1). The pump pit (13) is used to install a water pump (14).

5. A sponge city rainwater treatment device according to claim 1, characterized in that: The rainwater pool (1) is provided with multiple ventilation pipes (6) at the top; the ventilation pipes (6) are provided with rain caps (61) at the top, and the rain caps (61) are surrounded by insect-proof nets (62).

6. A sponge city rainwater treatment device according to claim 5, characterized in that: The upper end of the ventilation pipe (6) is higher than the wellhead of the inspection well (2); a traction rope (7) is pulled on the side of the cover plate (12) away from the absorbent resin cotton pack (121), and the well wall of the inspection well (2) is provided with a binding piece (71) for binding the traction rope (7).

7. A sponge city rainwater treatment device according to claim 1, characterized in that: The inlet pipe (3) is provided with a filter element (4) at one end near the inspection well (2). The filter element (4) includes an outer frame (41) and a filter screen (42). The filter screen (42) is fixed inside the outer frame (41). The outer circumferential surface of the outer frame (41) is adapted to the inner circumferential surface of the inlet pipe (3). The filter screen (42) is inclined. The surface of the filter screen (42) away from the inspection well (2) is inclined downward. A plurality of limiting members (43) are inserted into the inner wall of the inlet pipe (3). The limiting members (43) are located on the side of the filter element (4) near the inspection well (2).

8. A sponge city rainwater treatment device according to claim 7, characterized in that: The inlet pipe (3) is equipped with an oil baffle (5), which is located on the side of the filter element (4) away from the inspection well (2).

Images