A road rainwater treatment device for sponge city
By designing permeable pavement rainwater treatment devices in sponge cities, overflow channels and backflushing mechanisms are used to achieve rainwater sedimentation and self-cleaning, solving the problems of low purification efficiency and equipment blockage of traditional devices, and improving water resource utilization and equipment reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWERCHINA HUADONG ENG CORP LTD
- Filing Date
- 2025-04-11
- Publication Date
- 2026-06-16
Smart Images
Figure CN224363412U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a road surface rainwater treatment device for sponge cities. It is applicable to the technical field of urban rainwater treatment devices. Background Technology
[0002] With urbanization, urban environmental construction has gradually gained attention. In recent years, a new generation of urban stormwater management strategy and method, known as a sponge city, has been proposed. This concept aims to make cities resilient, like sponges, adapting to environmental changes and responding to natural disasters caused by rainwater. It is one of the goals of modern urban development. The construction of a sponge city requires consideration of rainwater collection, treatment, and discharge in various aspects. For example, in rainwater treatment, it is necessary to filter out impurities to prevent rainwater from carrying large amounts of food scraps or animal carcasses into rivers, leading to eutrophication and water pollution. Therefore, rainwater purification devices are used for centralized treatment. Traditional rainwater purification devices use low-lying reservoirs to collect urban rainwater and then guide it into the purification device. Traditional purification devices typically consist of a filter screen, support frame, guide pipe, and main frame. This type of purification device is simple in structure, easy to use, and relatively inexpensive to manufacture, making it the most widely used type of rainwater purification device for sponge cities. However, in practical applications, sponge city pavements are usually made of permeable materials. Permeable pavements have a porous structure and can purify rainwater. Therefore, using permeable pavements in sponge cities as part of rainwater purification has become a research direction. Utility Model Content
[0003] The technical problem to be solved by this utility model is: In order to solve the above-mentioned technical problem, this utility model provides a road surface rainwater treatment device for sponge cities.
[0004] The technical solution adopted in this utility model is: a road surface rainwater treatment device for sponge cities, which has the following features:
[0005] The permeable pavement has permeable holes and a sloping surface. An overflow channel is arranged at the lower end of the slope, and a return channel is arranged at the upper end of the slope. The overflow channel is lower than the return channel.
[0006] The collection box is located below the permeable pavement and is used to collect rainwater that seeps from the permeable pavement. The collection box is connected to a drain pipe for draining the rainwater.
[0007] The overflow tank is connected to the overflow trough via an overflow pipe. A return pipe connected to the return trough is located at the bottom of the overflow tank. A drive mechanism is installed inside the overflow tank to push the water stored in the overflow tank downwards.
[0008] The controller communicates with the drive mechanism and controls its operation.
[0009] The drive mechanism has a first screw mounted vertically on the top cover of the overflow tank. A piston plate threadedly engaged with the first screw is mounted on the first screw extending into the overflow tank. The piston plate contacts the side wall of the overflow tank. A first guide rail arranged vertically is arranged on the side wall of the overflow tank. A first guide groove slidingly engaged with the first guide rail is provided on the piston plate. The first screw extending out of the overflow tank is connected to the output shaft of a motor mounted on the overflow tank. The motor is communicatively connected to the controller.
[0010] A backflushing mechanism is provided inside the collection tank. The backflushing mechanism has a second screw arranged horizontally inside the collection tank. The second screw is driven to rotate by a transmission mechanism. A second guide rail is arranged inside the collection tank along the length of the second screw. A backflushing groove with an upward opening is provided inside the collection tank. The backflushing groove is threadedly engaged with the second screw and slidably engaged with the second guide rail. A backflushing pipe is connected to the backflushing groove. The end of the backflushing pipe extends into the overflow tank and is installed on the upper end of the piston plate.
[0011] The end of the second screw extends out of the collection tank and into the overflow tank. The transmission mechanism has a driven bevel gear installed at the end of the second screw. A driven gear and a driving bevel gear that are threadedly engaged with the first screw are respectively installed at the upper and lower ends of the top cover of the overflow tank. The driven gear and the driving bevel gear are fixedly connected. A driving gear is installed on the motor output shaft installed on the overflow tank. The driving gear meshes with the driven gear, and the driving bevel gear meshes with the driven bevel gear.
[0012] A backflush valve is installed on the backflush pipe, and the backflush valve is communicatively connected to the controller.
[0013] An overflow valve is installed on the overflow pipe, and the overflow valve is connected to the controller.
[0014] A reflux valve is installed on the reflux pipe, and the reflux valve is communicatively connected to the controller.
[0015] A method for treating road surface stormwater in a sponge city, using the aforementioned road surface stormwater treatment device for a sponge city, is characterized by:
[0016] When it rains, rainwater drips onto the permeable pavement. After being filtered through the permeable holes in the pavement, the rainwater falls into the collection tank and is discharged through the discharge pipe. The controller controls the backwash valve, overflow valve, and return valve to close.
[0017] When rainfall increases, the water level on the permeable pavement rises to the overflow trough position due to the infiltration efficiency of the permeable holes and the discharge efficiency of the discharge pipe. The controller then controls the overflow valve to open, allowing excess rainwater on the permeable pavement to flow into the overflow tank and settle there.
[0018] When rainfall decreases, the water level on the permeable pavement drops. The controller controls the overflow valve to close, the backwash valve and the return valve to open, and the controller also controls the motor to run, which drives the piston plate to move downward and compress the rainwater in the overflow tank. The impurities settled at the bottom of the overflow tank flow back to the permeable pavement with the rainwater through the return pipe and return trough. After being filtered by the permeable pavement, the rainwater is discharged from the discharge pipe. The clarified rainwater below the piston plate, after settling, flows from bottom to top through the backwash pipe and backwash trough to clean the permeable pavement. When the motor drives the first screw to rotate, it drives the second screw to rotate under the action of the transmission mechanism, which makes the backwash trough move in the collection box, thereby backwashing the permeable pavement.
[0019] After the controller controls the motor to move the piston plate to the bottom of the overflow tank, the rainwater in the overflow tank is discharged. The controller then controls the motor to run in reverse to achieve a reset, and controls the backwash valve, overflow valve, and return valve to close.
[0020] The beneficial effects of this utility model are:
[0021] Self-cleaning function: By moving the piston plate up and down in the overflow tank, in conjunction with the backwash groove and backwash pipe, it can backwash the seepage road surface, effectively remove the deposits in the porous structure, maintain water permeability, and reduce manual maintenance costs.
[0022] High-efficiency sedimentation treatment: When rainfall is heavy, some rainwater will directly enter the overflow tank. After sedimentation in the overflow tank, the sediment can be carried back to the permeable pavement through the return pipe for filtration, preventing impurities from entering the sewage system and protecting water quality.
[0023] Resource recycling: The clarified rainwater is reused to clean the permeable pavement through a backwashing process, realizing the recycling of water resources, which is in line with the construction concept of sponge cities and improves the utilization rate of water resources.
[0024] Automated operation: The controller controls the motor to drive the entire system, including the lifting and lowering of the piston plate and the reciprocating motion of the backflushing trough, realizing an automated rainwater purification process without human intervention, thus improving the reliability and convenience of the system.
[0025] Optimized space utilization: This device integrates traditional rainwater collection, sedimentation, filtration and backwashing functions, reducing the number of required devices and optimizing the space layout, making it more suitable for use in urban environments.
[0026] Highly adaptable: The design takes into account different rainfall intensities, ensuring effective rainwater infiltration during light rain and reducing surface runoff pressure during heavy rain through the overflow system, thus enhancing the system's ability to cope with various weather conditions.
[0027] Extend facility lifespan: Regular self-cleaning can effectively delay the problem of permeable brick clogging, thereby extending its service life and reducing long-term operating costs. Attached Figure Description
[0028] Figure 1 , 2 3, 4: Structural schematic diagrams of this utility model.
[0029] Figure 5 , 6 7, 8: Exploded structural diagrams of this utility model.
[0030] Figure 9 : Block diagram of the controller connection of this utility model.
[0031] In the diagram: 1. Permeable pavement; 1-1. Permeable hole; 1-2. Overflow channel; 1-3. Return channel; 2. Collection box; 2-1. Discharge pipe; 3. Overflow tank; 3-1. Overflow pipe; 3-2. Return pipe; 3-3. Return valve; 3-4. Top cover; 3-5. Overflow valve; 4. Drive mechanism; 4-1. First screw; 4-2. Piston plate; 4-3. First guide rail; 4-4. Motor; 5. Backflush mechanism; 5-1. Second screw; 5-2. Second guide rail; 5-3. Backflush channel; 5-4. Backflush pipe; 5-5. Backflush valve; 6. Transmission mechanism; 6-1. Driven bevel gear; 6-2. Driven bevel gear; 6-3. Driven gear; 6-4. Driven gear; 7. Controller. Detailed Implementation
[0032] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.
[0033] Example 1 is a road surface rainwater treatment device for sponge cities, which has the following features:
[0034] Permeable pavement 1, permeable pavement 1 has permeable holes 1-1, the surface of permeable pavement 1 is sloping, an overflow channel 1-2 is arranged at the lower end of the slope of permeable pavement 1, a return channel 1-3 is arranged at the upper end of the slope of permeable pavement 1, and the overflow channel 1-2 is lower than the return channel 1-3.
[0035] Collection box 2 is located below the permeable pavement 1 and is used to collect rainwater that seeps from the permeable pavement 1. A discharge pipe 2-1 is connected to the collection box 2 to discharge the rainwater.
[0036] Overflow tank 3 is connected to overflow trough 1-2 via overflow pipe 3-1. At the bottom of overflow tank 3, return pipe 3-2 is connected to return trough 1-3. Inside overflow tank 3, there is a drive mechanism 4 that can push the water stored in overflow tank 3 downward.
[0037] Controller 7 is communicatively connected to drive mechanism 4 and can control the operation of drive mechanism 4. Thus, when rainfall is light, rainwater is filtered through the permeable pavement 1 and permeates into the collection tank 2 below, eventually being discharged into the drainage system through discharge pipe 2-1. When rainfall is heavy, the permeable pavement 1's filtration efficiency is insufficient to filter rainwater, causing the water level on the permeable pavement 1 to rise until it reaches the overflow trough 1-2. Some rainwater is collected through the overflow trough 1-2 into the overflow tank 3. When rainfall is light or stops, the water level on the permeable pavement 1 drops. Controller 7 then controls drive mechanism 4 to push the water stored in overflow tank 3 downwards and back to the permeable pavement 1 through return pipe 3-2 (i.e., return trough 1-3), where the permeable pavement 1 filters the rainwater collected in overflow tank 3.
[0038] Example 2 is a sponge city road surface rainwater treatment device. Based on Example 1, in this example, the drive mechanism 4 has a first screw 4-1 installed vertically on the top cover 3-4 of the overflow tank 3. A piston plate 4-2 threadedly engages with the first screw 4-1 on the first screw 4-1 that extends into the overflow tank 3. The piston plate 4-2 contacts the side wall of the overflow tank 3. A first guide rail 4-3 arranged vertically is provided on the side wall of the overflow tank 3. A first guide groove that slides with the first guide rail 4-3 is provided on the piston plate 4-2. The first screw 4-1 extending out of the overflow tank 3 is connected to the output shaft of a motor 4-4 installed on the overflow tank 3. The motor 4-4 is communicatively connected to the controller 7. Thus, when the controller 7 controls the motor 4-4 to run, it can drive the first screw 4-1 to rotate. Under the action of the threaded engagement between the piston plate 4-2 and the first screw 4-1 and the sliding engagement between the piston plate 4-2 and the first guide rail 4-3, the piston plate 4-2 can be driven to move downward, thereby pressing the water stored in the overflow tank 3 into the return pipe 3-2. When the controller 7 controls the motor 4-4 to run in the reverse direction, it can drive the piston plate 4-2 to move upward and reset.
[0039] Example 3 is a sponge city road surface rainwater treatment device. Based on Example 2, in this example, a backflushing mechanism 5 is provided in the collection tank 2. The backflushing mechanism 5 has a second screw 5-1 arranged horizontally in the collection tank 2. The second screw 5-1 is driven to rotate by the transmission mechanism 6. A second guide rail 5-2 is arranged in the collection tank 2 along the length of the second screw 5-1. A backflushing groove 5-3 with an upward opening is provided in the collection tank 2. The backflushing groove 5-3 is threadedly engaged with the second screw 5-1 and slidably engaged with the second guide rail 5-2. A backflushing pipe 5-4 is connected to the backflushing groove 5-3. The end of the backflushing pipe 5-4 extends into the overflow tank 3 and is installed on the upper end of the piston plate 4-2.
[0040] The end of the second screw 5-1 extends out of the collection box 2 and into the overflow tank 3. The transmission mechanism 6 has a driven bevel gear 6-1 installed at the end of the second screw 5-1. A driven gear 6-3 and a driving bevel gear 6-2 that are threadedly engaged with the first screw 4-1 are respectively installed at the upper and lower ends of the top cover 3-4 of the overflow tank 3. The driven gear 6-3 and the driving bevel gear 6-2 are fixedly connected. A driving gear 6-4 is installed on the output shaft of the motor 4-4 installed on the overflow tank 3. The driving gear 6-4 meshes with the driven gear 6-3, and the driving bevel gear 6-2 meshes with the driven bevel gear 6-1.
[0041] Thus, when the motor 4-4 drives the drive gear 6-4 to rotate, the meshing of the gears drives the driven gear 6-3 and the drive bevel gear 6-2 to rotate. Under the limiting action of the top cover 3-4 of the overflow tank 3, the drive screw rotates, thereby causing the piston plate 4-2 to move. Under the meshing action of the drive bevel gear 6-2 and the driven bevel gear 6-1, the second screw 5-1 is driven to rotate. Under the threaded engagement of the backflushing groove 5-3 and the second screw 5-1 and the sliding engagement of the backflushing groove 5-3 and the second guide rail 5-2, the backflushing groove 5-3 can be driven to move with the piston plate 4-2. When the piston plate 4-2 moves downward and squeezes the water stored in the overflow tank 3, the water stored in the overflow tank 3 flows through the backflushing pipe 5-4 into the backflushing groove 5-3 and is sprayed upward toward the permeable pavement 1 to flush the permeable holes 1-1 on the permeable pavement 1.
[0042] Example 4 is a road surface rainwater treatment device for sponge cities. Based on Example 3, in this example, a backflushing valve 5-5 is installed on the backflushing pipe 5-4, and the backflushing valve 5-5 is communicatively connected to the controller 7. An overflow valve 3-5 is installed on the overflow pipe 3-1, and the overflow valve 3-5 is communicatively connected to the controller 7. A return valve 3-3 is installed on the return pipe 3-2, and the return valve 3-3 is communicatively connected to the controller 7. Thus, when the overflow tank 3 is filled with water, the controller 7 controls the overflow valve 3-5 to open and the backflushing valve 5-5 and the return valve 3-3 to close, so that excess rainwater on the permeable pavement 1 can flow into the overflow tank 3 through the overflow channel 1-2 and the overflow pipe 3-1. After the water level on the permeable pavement 1 drops, the controller 7 controls the overflow valve 3-5 to close and the backflushing valve 5-5 and the return valve 3-3 to open. Then, the controller 7 controls the motor 4-4 to run, which drives the piston plate 4-2 in the overflow tank 3 to move downward and press the water in the overflow tank 3 towards the backflushing pipe 5-4 and the return pipe 3-2. As piston plate 4-2 moves downward, a significant amount of water in overflow tank 3 flows through return channel 1-3 onto permeable pavement 1. After being filtered by permeable pavement 1, it is discharged through discharge pipe 2-1. The water that has settled below piston plate 4-2 in overflow tank 3 flows through piston plate 4-2 to backflushing pipe 5-4 and then upward through backflushing channel 5-3 to flush the permeable holes 1-1 of permeable pavement 1, relieving blockage of permeable holes 1-1. As piston plate 4-2 moves downward, collection tank 2 within backflushing channel 5-3 moves. When piston plate 4-2 moves upward and resets, backflushing channel 5-3 also resets synchronously.
[0043] Example 5 is a road surface rainwater treatment device for sponge cities. In this example, it has:
[0044] Permeable pavement 1, permeable pavement 1 has permeable holes 1-1, the surface of permeable pavement 1 is sloping, an overflow channel 1-2 is arranged at the lower end of the slope of permeable pavement 1, a return channel 1-3 is arranged at the upper end of the slope of permeable pavement 1, and the overflow channel 1-2 is lower than the return channel 1-3.
[0045] Collection box 2 is located below the permeable pavement 1 and is used to collect rainwater that seeps from the permeable pavement 1. A discharge pipe 2-1 is connected to the collection box 2 to discharge the rainwater.
[0046] Overflow tank 3 is connected to overflow trough 1-2 via overflow pipe 3-1. At the bottom of overflow tank 3, return pipe 3-2 is connected to return trough 1-3. Inside overflow tank 3, there is a drive mechanism 4 that can push the water stored in overflow tank 3 downward.
[0047] Controller 7 is connected to drive mechanism 4 and can control the operation of drive mechanism 4.
[0048] The drive mechanism 4 has a first screw 4-1 mounted vertically on the top cover 3-4 of the overflow tank 3. A piston plate 4-2 threadedly engages with the first screw 4-1 on the first screw 4-1 which extends into the overflow tank 3. The piston plate 4-2 contacts the side wall of the overflow tank 3. A first guide rail 4-3 arranged vertically is provided on the side wall of the overflow tank 3. A first guide groove slidingly engages with the first guide rail 4-3 is provided on the piston plate 4-2. The first screw 4-1 extending out of the overflow tank 3 is connected to the output shaft of a motor 4-4 mounted on the overflow tank 3. The motor 4-4 is communicatively connected to the controller 7.
[0049] A backflushing mechanism 5 is provided inside the collection tank 2. The backflushing mechanism 5 has a second screw 5-1 arranged horizontally inside the collection tank 2. The second screw 5-1 is driven to rotate by a transmission mechanism 6. A second guide rail 5-2 is arranged inside the collection tank 2 along the length of the second screw 5-1. A backflushing groove 5-3 with an upward opening is provided inside the collection tank 2. The backflushing groove 5-3 is threadedly engaged with the second screw 5-1 and slidably engaged with the second guide rail 5-2. A backflushing pipe 5-4 is connected to the backflushing groove 5-3. The end of the backflushing pipe 5-4 extends into the overflow tank 3 and is installed on the upper end of the piston plate 4-2.
[0050] The end of the second screw 5-1 extends out of the collection box 2 and into the overflow tank 3. The transmission mechanism 6 has a driven bevel gear 6-1 installed at the end of the second screw 5-1. A driven gear 6-3 and a driving bevel gear 6-2 that are threadedly engaged with the first screw 4-1 are respectively installed at the upper and lower ends of the top cover 3-4 of the overflow tank 3. The driven gear 6-3 and the driving bevel gear 6-2 are fixedly connected. A driving gear 6-4 is installed on the output shaft of the motor 4-4 installed on the overflow tank 3. The driving gear 6-4 meshes with the driven gear 6-3, and the driving bevel gear 6-2 meshes with the driven bevel gear 6-1.
[0051] A backflush valve 5-5 is installed on the backflush pipe 5-4, and the backflush valve 5-5 is communicatively connected to the controller 7.
[0052] An overflow valve 3-5 is installed on the overflow pipe 3-1, and the overflow valve 3-5 is communicatively connected to the controller 7.
[0053] A reflux valve 3-3 is installed on the reflux pipe 3-2, and the reflux valve 3-3 is communicatively connected to the controller 7.
[0054] The processing method in this embodiment is as follows:
[0055] When it rains, rainwater drips onto the permeable pavement 1. After being filtered through the permeable holes 1-1 on the permeable pavement 1, the rainwater falls into the collection box 2 and is discharged through the discharge pipe 2-1. The controller 7 controls the backwash valve 5-5, the overflow valve 3-5, and the return valve 3-3 to close.
[0056] When the rainfall increases, the water level on the permeable pavement 1 rises to the overflow trough 1-2 due to the infiltration efficiency of the permeable hole 1-1 and the discharge efficiency of the discharge pipe 2-1. The controller 7 controls the overflow valve 3-5 to open, so that the excess rainwater on the permeable pavement 1 flows into the overflow tank 3 and settles in the overflow tank 3.
[0057] When rainfall decreases, the water level on the permeable pavement 1 drops. The controller 7 controls the overflow valve 3-5 to close, controls the backwash valve 5-5 and the return valve 3-3 to open, and controls the motor 4-4 to run, driving the piston plate 4-2 to move downward and compress the rainwater in the overflow tank 3. The impurities settled at the bottom of the overflow tank 3 flow back to the permeable pavement 1 with the rainwater through the return pipe 3-2 and the return trough 1-3. After being filtered by the permeable pavement 1, the rainwater is discharged from the discharge pipe 2-1. The clarified rainwater below the piston plate 4-2, after sedimentation, flows from bottom to top through the backwash pipe 5-4 and the backwash trough 5-3 to flush the permeable pavement 1, cleaning the permeable pavement 1. When the motor 4-4 drives the first screw 4-1 to rotate, it drives the second screw 5-1 to rotate under the action of the transmission mechanism 6, causing the backwash trough 5-3 to move in the collection box 2, thereby backwashing the permeable pavement 1.
[0058] After the controller 7 controls the motor 4-4 to move the piston plate 4-2 to the bottom position of the overflow tank 3, the rainwater in the overflow tank 3 is discharged. The controller 7 controls the motor 4-4 to run in reverse to achieve reset, and the controller 7 controls the backwash valve 5-5, overflow valve 3-5 and return valve 3-3 to close.
[0059] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A rainwater treatment device for sponge cities, characterized in that: have: Permeable pavement (1), permeable pavement (1) has permeable holes (1-1), the surface of permeable pavement (1) is sloping, an overflow channel (1-2) is arranged at the lower end of the slope of permeable pavement (1), a return channel (1-3) is arranged at the upper end of the slope of permeable pavement (1), and the overflow channel (1-2) is lower than the return channel (1-3). The collection box (2) is located below the permeable pavement (1) and is used to collect rainwater that seeps from the permeable pavement (1). The collection box (2) is connected to a discharge pipe (2-1) for draining the rainwater. Overflow tank (3), the overflow tank (3) is connected to the overflow trough (1-2) through the overflow pipe (3-1), the bottom of the overflow tank (3) is connected to the return pipe (3-2) connected to the return trough (1-3), and a drive mechanism (4) is provided in the overflow tank (3) to push the water stored in the overflow tank (3) downward. The controller (7) is connected to the drive mechanism (4) and can control the operation of the drive mechanism (4).
2. The sponge city road surface rainwater treatment device according to claim 1, characterized in that: The drive mechanism (4) has a first screw (4-1) mounted vertically on the top cover (3-4) of the overflow tank (3). A piston plate (4-2) threadedly engages with the first screw (4-1) on the first screw (4-1) which extends into the overflow tank (3). The piston plate (4-2) contacts the side wall of the overflow tank (3). A first guide rail (4-3) is arranged vertically on the side wall of the overflow tank (3). A first guide groove is provided on the piston plate (4-2) that slides with the first guide rail (4-3). The first screw (4-1) extending out of the overflow tank (3) is connected to the output shaft of a motor (4-4) mounted on the overflow tank (3). The motor (4-4) is communicatively connected to the controller (7).
3. A sponge city road surface rainwater treatment device according to claim 2, characterized in that: A backflushing mechanism (5) is provided inside the collection box (2). The backflushing mechanism (5) has a second screw (5-1) arranged horizontally inside the collection box (2). The second screw (5-1) is driven to rotate by the transmission mechanism (6). A second guide rail (5-2) is arranged along the length of the second screw (5-1) inside the collection box (2). A backflushing groove (5-3) with an upward opening is provided inside the collection box (2). The backflushing groove (5-3) is threadedly engaged with the second screw (5-1). The backflushing groove (5-3) is slidably engaged with the second guide rail (5-2). A backflushing pipe (5-4) is connected to the backflushing groove (5-3). The end of the backflushing pipe (5-4) extends into the overflow tank (3) and is installed on the upper end of the piston plate (4-2).
4. A sponge city road surface rainwater treatment device according to claim 3, characterized in that: The end of the second screw (5-1) extends out of the collection box (2) and into the overflow tank (3). The transmission mechanism (6) has a driven bevel gear (6-1) installed at the end of the second screw (5-1). A driven gear (6-3) and a driving bevel gear (6-2) that are threadedly engaged with the first screw (4-1) are respectively installed at the upper and lower ends of the top cover (3-4) of the overflow tank (3). The driven gear (6-3) and the driving bevel gear (6-2) are fixedly connected. A driving gear (6-4) is installed on the output shaft of the motor (4-4) installed on the overflow tank (3). The driving gear (6-4) meshes with the driven gear (6-3), and the driving bevel gear (6-2) meshes with the driven bevel gear (6-1).
5. A sponge city road surface rainwater treatment device according to claim 3, characterized in that: A backflush valve (5-5) is installed on the backflush pipe (5-4), and the backflush valve (5-5) is connected to the controller (7) in communication.
6. A sponge city road surface rainwater treatment device according to claim 1, characterized in that: An overflow valve 6-6 is installed on the overflow pipe (3-1), and the overflow valve 6-6 is connected to the controller (7) for communication.
7. A sponge city road surface rainwater treatment device according to claim 1, characterized in that: A reflux valve (3-3) is installed on the reflux pipe (3-2), and the reflux valve (3-3) is connected to the controller (7) for communication.