A sunken lawn initial rainwater runoff pollution intelligent diversion and interception device and a use method thereof

Abstract

The present application provides a kind of concave green initial rainwater runoff pollution intelligent shunt interception device and its use method, including box, rainwater grate is arranged on one side of upper end of box, floating ball piece is arranged on the upper end of side wall of box, hollow floating ball is arranged in floating ball piece, floating ball is connected with pull rope, pull rope is connected with intercepting sealing plate on the other side, intercepting sealing plate side is provided with sealing plate hinge, intercepting sealing plate can rotate around sealing plate hinge rotating shaft, sealing plate hinge is connected with the bottom surface of box, the bottom surface of box is provided with drain pipe, overflow port is arranged on the other side of upper end of box and the side opposite to rainwater grate, check damper that cooperates with it is arranged on the lower edge of overflow port, cover plate is arranged above the box.The present application can realize effective intelligent interception and nearby purification of initial rainwater runoff pollution, the device structure is simple, low in cost, without electrical equipment and energy consumption, with wide application prospect.

Description

Technical Field

[0001] This invention relates to the fields of municipal engineering and building engineering technology, and in particular to a smart diversion and interception device for initial rainwater runoff pollution in sunken green spaces. Background Technology

[0002] Currently, the construction of urban "sponge" systems can achieve efficient processes of infiltration, retention, storage, purification, utilization, and drainage of rainwater runoff, thereby improving the current state of urban stormwater management. These six processes can be achieved through the construction of numerous sunken green spaces along plazas or roadsides. Sunken green spaces effectively store rainwater and replenish groundwater through infiltration. They also purify polluted rainwater runoff through the action of vegetation. The "sponge" measure of constructing numerous sunken green spaces can effectively alleviate stormwater management challenges, efficiently retain rainwater and pollutants, reduce rainwater runoff volume, and reduce pollution of downstream receiving water bodies. The key process of the sunken green space "sponge" measure is the collection of initial rainwater runoff.

[0003] The current initial rainwater runoff collection process is basically achieved by setting up sunken green spaces and overflow outlets. The collection process is that the nearby rainwater runoff flows directly into the sunken green space. After the water level in the sunken green space rises to the height of the overflow outlet, the excess rainwater runoff enters the rainwater drainage network or ditch through the overflow outlet for external discharge. This collection mechanism is problematic because the initial rainwater runoff has a higher concentration of pollutants, while subsequent runoff has a lower concentration. The focus should be on collecting the initial runoff, not the subsequent runoff. However, traditional sunken green spaces do not specifically target this type of runoff. Although the initial runoff with higher pollutant concentrations enters the sunken green space first, followed by the later runoff with lower concentrations, they mix completely within the space. This mixture then overflows into the stormwater drainage network or ditches. The initial runoff is diluted by the later runoff, and the pollutants are carried into the drainage network or ditches, ultimately contaminating the receiving water bodies. Because the diversion and interception method cannot clearly distinguish between collecting the initial runoff, the sunken green space fails to effectively intercept and purify the pollution from the initial runoff.

[0004] In addition to the aforementioned ecological, non-mechanical "sponge" measures for rainwater runoff collection, there are also many electric intelligent diversion and interception systems and storage and scheduling systems for rainwater runoff collection. However, due to the complexity of these systems, which include a variety of electromechanical devices, they are not suitable for decentralized and large-scale use under the premise of low-impact development. Most existing initial rainwater runoff collection measures have problems such as complex electromechanical devices, energy consumption, high cost, and the need for manual control. There are few reports on non-powered, automatic intelligent diversion and interception devices and their usage methods for initial rainwater runoff pollution in sunken green spaces.

[0005] Initial stormwater runoff contains high concentrations of pollutants, making its interception and purification a crucial aspect of non-point source pollution control and an important component of "sponge city" construction and water environment protection. The key to controlling initial stormwater runoff pollution lies in the separate collection of initial stormwater runoff and its purification in nearby green spaces. However, existing "sponge city" construction projects often neglect this aspect, only achieving a certain amount of rainwater retention nearby, failing to achieve the separate collection and purification of pollutants from initial stormwater runoff. There is an urgent need for a device and method capable of intelligently diverting and intercepting initial stormwater runoff pollution and storing it in sunken green spaces for absorption and purification. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a smart diversion and interception device for initial rainwater runoff pollution in sunken green spaces and its usage method. By installing this device at the drainage outlet of the catchment area, the initial rainwater runoff collected in the catchment area is automatically collected and isolated within the sunken green space. After the initial rainwater runoff is completely collected and enters the sunken green space, it is stored, purified, and infiltrated to replenish groundwater. This achieves effective separation and collection of initial rainwater runoff and its carried pollutants, preventing the migration of initial rainwater runoff pollution to receiving water bodies. This device contains no electrical equipment and can intelligently separate, collect, and isolate initial rainwater runoff pollution. It is suitable for widespread use at numerous sunken green space connections near rainwater collection surfaces, such as plazas and roadsides. The technical solution adopted by this invention is:

[0007] A smart diversion and interception device for initial rainwater runoff pollution in sunken green spaces includes: a housing with a rain grate on one side of the upper end; a hollow cuboid float in the middle of the upper side wall of the housing; several holes on the bottom surface of the float; a pull rope connected to the float; a flow-blocking sealing plate connected to the end of the pull rope away from the float; a sealing plate hinge on the side of the sealing plate; the sealing plate can rotate around the hinge axis; the hinge connects to the bottom surface of the housing; a drain pipe is installed on the bottom surface of the housing; when the sealing plate rotates around the hinge to a horizontal position to block the drain pipe opening, the center of the sealing plate overlaps with the center of the drain pipe opening; an overflow port is installed on the upper end of the housing opposite to the rain grate; a check valve is installed at the lower edge of the overflow port; and a cover plate is installed on the top of the housing.

[0008] Preferably, in the aforementioned intelligent diversion and interception device for initial rainwater runoff pollution in sunken green spaces, the structure of the float component is a hollow cuboid with a square cross-section, and the diameter of the float is slightly smaller than the side length of the cuboid cross-section of the float component.

[0009] Preferably, in the aforementioned intelligent diversion and interception device for initial rainwater runoff pollution in sunken green spaces, the interception sealing plate is a circular plate with a diameter slightly larger than that of the drainage pipe.

[0010] Preferably, in the intelligent diversion and interception device for initial rainwater runoff pollution in the sunken green space, a rubber lining is provided on the side of the interception sealing plate closest to the drainage pipe.

[0011] Preferably, in the aforementioned intelligent diversion and interception device for initial rainwater runoff pollution in sunken green spaces, the side where the sealing plate hinge rotation shaft and the float are located coincides with the intersection line of the bottom surface of the box, so that the angle between the intercepting sealing plate and the bottom surface is a maximum of 90° when the float and the pull rope are lifted.

[0012] Preferably, in the aforementioned intelligent diversion and interception device for initial rainwater runoff pollution in sunken green spaces, the shape of both the check baffle and the overflow outlet is rectangular, the width of the check baffle is slightly larger than the width of the overflow outlet, a baffle hinge is provided on the box body at the lower edge of the overflow outlet, the check baffle is set on the side wall of the box body through the baffle hinge, and the rotation axis of the baffle hinge coincides with the lower edge of the rectangular overflow outlet.

[0013] Preferably, in the intelligent diversion and interception device for initial rainwater runoff pollution in the sunken green space, a rubber lining is provided on the side of the check baffle near the overflow outlet.

[0014] Preferably, in the intelligent diversion and interception device for initial rainwater runoff pollution in the sunken green space, the water level H2 when the float pulls the interception sealing plate is higher than the horizontal centerline H3 when the check baffle is upright.

[0015] The method of using a smart diversion and interception device for initial rainwater runoff pollution in sunken green spaces includes the following steps:

[0016] Step 1: Before the device can divert and intercept the initial rainwater runoff into the sunken green space, it is necessary to install the device at the connection point between the rainwater collection surface outlet and the nearby sunken green space.

[0017] Step 2: During rainfall, rainwater collects on the underlying surface to form rainwater runoff. The initial rainwater runoff enters the device through the rainwater grate. The intercepting and sealing plate in the device naturally hangs down under the action of gravity to block the drain pipe opening. When the sunken green space is emptied, the check baffle naturally hangs down to the side of the sunken green space. The initial rainwater runoff enters the sunken green space from the overflow port through the device box, and the sunken green space begins to accumulate and collect the initial rainwater runoff.

[0018] Step 3: Rainwater runoff continuously enters the sunken green space, causing the water level in the sunken green space to rise. The water level in the tank rises synchronously, and the float rises synchronously with the water level in the tank. The pull rope is pulled up as the float rises. After the pull rope is straightened, the water level continues to rise, and the float stops rising. The submersion of the float increases, and the buoyancy of the float increases. The water level rises to the zero-level water level H2 of the discharge. The buoyancy of the float increases to the point that it can pull the sealing plate. The water in the tank quickly rushes into the lower drainage pipe. The intercepting sealing plate is pushed against the side wall of the tank by the water when the drainage pipe discharges. The water level in the tank drops, and the water in the sunken green space wants to flow back into the tank. At this time, the check baffle is pushed against the tank. Since the check baffle is wider than the overflow port, the check baffle closes the overflow port. The initial rainwater runoff is intercepted in the sunken green space, and the later rainwater runoff is directly discharged into the underground rainwater drainage pipe through the drainage pipe.

[0019] Step 4: After the rainwater runoff stops entering the device, the intercepting and sealing plate falls down to block the drainage outlet. Then, it waits for the collection of the initial rainwater runoff of the next rainfall to start. The pollutants in the initial rainwater runoff are intercepted in the sunken green space and purified and utilized by the green plants and infiltrated. After a certain period of time, the water level drops and the check baffle naturally hangs down, waiting to intercept and divert the initial rainwater runoff of the next rainfall.

[0020] In step one, during installation, the elevation H1 of the lower edge of the rain grate and the elevation H0 of the lower edge of the rainwater runoff collection area outlet satisfy H0>H1. The overflow outlet of the device is aligned with the sunken green space, and the lower edge of the overflow outlet is higher than the bottom surface of the sunken green space to ensure water storage capacity. The elevation H1 of the lower edge of the rain grate when water enters is higher than the water level elevation H2 when the float pulls the intercepting sealing plate, i.e., H1>H2, ensuring that the device can take in water under any circumstances without affecting the drainage of the rainwater collection surface. The effective volume V (cubic meters) of the sunken green space for initial rainwater runoff absorption is the initial volume collected and contained. The volume of rainwater runoff can be calculated using the catchment area S (square meters) and the initial precipitation D (millimeters) to be collected, which can be determined as V = S × D. The initial precipitation D (millimeters) to be collected is the precipitation when more than 80% of the total pollutant migration from the underlying surface runoff occurs during a single rainfall event. Then, based on the effective volume V, the area and average depth of the sunken green space, the water surface elevation H4 at the effective volume is calculated. This determines the water level to be maintained in the sunken green space when the intelligent diversion and interception device stops collecting rainwater runoff, ensuring that the collected rainwater runoff volume meets the requirements for runoff pollution collection. The intelligent diversion and interception device is installed according to this water level requirement, ensuring that the device's interception stop water level matches the required effective water depth of the sunken green space, i.e., H2 = H4. Finally, the device's drainage pipe is connected to the underground rainwater drainage pipe, completing the installation.

[0021] Advantages of this invention:

[0022] (1) The intelligent diversion and interception device for initial rainwater runoff pollution in sunken green space of the present invention can realize intelligent diversion and interception of initial rainwater runoff pollution. The diverted and intercepted initial rainwater runoff overflows into the sunken green space for purification and infiltration. The check structure designed on the device prevents the diverted and intercepted initial rainwater runoff pollution from flowing back into the rainwater drainage network. The initial rainwater runoff pollution is completely separated and purified by the sunken green space alone, realizing the in-situ or nearby interception of initial rainwater runoff pollutants, preventing them from entering the final receiving water body and reducing the rainwater runoff pollution load of the receiving water body.

[0023] (2) The intelligent diversion and interception device for initial rainwater runoff pollution in sunken green space of the present invention uses a float ball to automatically control the switch of the diversion and interception function according to the water level. It does not require any power device or manual management. The device is integrated and can be directly installed at the connection position of the water inlet and the rainwater collection surface outlet of existing and under construction sunken green space measures. It is simple to install and easy to construct.

[0024] (3) The intelligent diversion and interception device for initial rainwater runoff pollution in sunken green spaces of the present invention has a simple structure, low cost, and is intelligent and energy-saving. It is suitable for the "sponge" measures for the management of initial rainwater runoff pollution in a large number of small blocks of sunken green spaces and has broad prospects for promotion and application. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] Figure 2 This is a schematic diagram illustrating the installation and use of step one of the usage methods of this invention.

[0027] Figure 3 This is a schematic diagram of the initial rainwater runoff condition in step two of the usage method of the present invention.

[0028] Figure 4 This is a schematic diagram of the critical water level for initial rainwater runoff interception in step three of the usage method of this invention.

[0029] Figure 5 This is a schematic diagram of the end condition of the initial rainwater runoff collection in step four of the usage method of the present invention. Detailed Implementation

[0030] The present invention will be further described below with reference to specific accompanying drawings and embodiments.

[0031] like Figure 1As shown: This embodiment provides a smart diversion and interception device for initial rainwater runoff pollution in sunken green spaces, comprising: a housing 2, a rainwater grate 1 installed on one side of the upper end of the housing 2, a float 3 installed in the middle of the upper end of the side wall of the housing 2, the float 3 being a rectangular shape with a square cross-section and hollow interior, a hollow float 4 installed inside the float 3, several holes provided on the bottom surface of the float 3, the float 4 being connected to a pull rope 5, the end of the pull rope 5 away from the float 3 being connected to a flow interception sealing plate 6, a sealing plate hinge 7 installed on the side of the flow interception sealing plate 6, the flow interception sealing plate 6 being rotatable around the rotation axis of the sealing plate hinge 7, and the sealing plate hinge 7 being connected to the housing. The bottom surface of the body 2 is provided with a drain pipe 8. When the intercepting sealing plate 6 rotates around the sealing plate hinge 7 to a horizontal position to block the opening of the drain pipe 8, the center of the intercepting sealing plate 6 overlaps with the center of the opening of the drain pipe 8. An overflow port 9 is provided on the upper port of the other side of the body 2 opposite to one side of the rain grate 1. A check baffle 10 is provided at the lower edge of the overflow port 9 to cooperate with it. A cover plate 12 is provided on the top of the body 2. The cover plate 12 is shaped to match the shape of the upper opening of the body 2 and covers the body 2. The four sides of the upright float 3 are all smooth and non-porous surfaces to avoid the scouring of the water from the rain grate 1 causing fluctuations in the height position of the float 4.

[0032] The structure of the float component 3 is a hollow cuboid with a square cross-section. The diameter of the float 4 is slightly smaller than the side length of the cuboid cross-section of the float component 3, so that the float 4 can float freely up and down inside the float component 3.

[0033] The intercepting sealing plate 6 is a circular plate with a diameter slightly larger than that of the drain pipe 8. The intercepting sealing plate 6 can rotate around the rotation axis of the sealing plate hinge 7. When the intercepting sealing plate 6 rotates to a horizontal position around the sealing plate hinge 7 to block the opening of the drain pipe 8, the center of the intercepting sealing plate 6 overlaps with the center of the opening of the drain pipe 8, ensuring that the position is aligned when blocking the drain pipe 8. The side of the intercepting sealing plate 6 that blocks the drain pipe 8 is covered with a rubber lining to ensure the watertightness of the blockage.

[0034] The hinge 7 of the sealing plate rotates at the intersection of the side of the float 3 and the bottom of the box 2, so that the angle between the sealing plate 6 and the bottom surface is up to 90° when the float 4 is pulled by the rope 5, so that the rainwater in the box can be reset by gravity to block the drain pipe 8 when it is drained.

[0035] Both the check baffle 10 and the overflow port 9 are rectangular in shape. The width of the check baffle 10 is slightly larger than the width of the overflow port 9. A baffle hinge 11 is provided on the box 2 at the lower edge of the overflow port 9. The check baffle 10 is connected to the side wall of the box 2 through the baffle hinge 11. The rotation axis of the baffle hinge 11 coincides with the lower edge of the rectangular overflow port 9. The overall density of the check baffle is less than that of water, and it can float around the rotation axis of the baffle as the water level rises and falls.

[0036] A rubber lining is provided on the side of the check baffle 10 near the overflow port 9 to ensure the tightness of the seal and prevent the initial rainwater runoff from flowing back into the tank 2. When the float 4 pulls the intercepting sealing plate 6, the water level H2 is higher than the horizontal centerline H3 when the check baffle is upright, that is, H2>H3, to ensure that the check function can be achieved.

[0037] Before the device can divert and intercept the initial rainwater runoff from the sunken green space, it needs to be installed at the connection between the rainwater collection surface outlet and the sunken green space. During installation, the rainwater grate 1 should be aligned with the rainwater collection surface outlet, ensuring that the collected rainwater runoff can only enter the sunken green space through the rainwater grate 1 of the device. The box body 2 should be buried in the gentle slope of the sunken green space to fix the device. The drainage pipe 8 at the lower end of the device is connected to the nearby underground rainwater drainage pipe through an extension pipeline, blocking the entrance of rainwater in the sunken green space into the rainwater drainage network.

[0038] During installation, the lower edge elevation H1 of the inlet rainwater grate 1 and the lower edge elevation H0 of the rainwater runoff collection area outlet satisfy H0>H1. The overflow outlet of the device is aligned with the sunken green space, and the lower edge of the overflow outlet is higher than the bottom surface of the sunken green space to ensure water storage capacity. The lower edge elevation H1 of the inlet rainwater grate 1 is higher than the water level elevation H2 when the float pulls the intercepting sealing plate, i.e., H1>H2, ensuring that the device can take in water under any circumstances without affecting the drainage of the rainwater collection surface. The effective volume V (cubic meters) of the sunken green space for initial rainwater runoff absorption is the amount of initial rainwater collected and contained. The runoff volume can be calculated using the catchment area S (square meters) and the initial precipitation to be collected D (millimeters), which can be determined as V = S × D. The initial precipitation to be collected D (millimeters) is the precipitation when more than 80% of the total pollutant migration from the underlying surface runoff occurs during a single rainfall event. Then, based on the effective volume V, the area and average depth of the sunken green space, the water surface elevation H4 at the effective volume is calculated. This determines the water level to be maintained in the sunken green space when the intelligent diversion and interception device stops collecting rainwater runoff, ensuring that the collected rainwater runoff volume meets the requirements for initial rainwater runoff pollution collection. The intelligent diversion and interception device is installed according to this water level requirement, ensuring that the device's interception stop water level matches the required effective water depth of the sunken green space, i.e., H2 = H4. Finally, the device's drainage pipe is connected to the underground rainwater drainage pipe, completing the installation.

[0039] The intelligent diversion, interception, and collection process for initial rainwater runoff pollution in the device is as follows: First, precipitation in the catchment area forms surface runoff. This initial rainwater runoff carries a high concentration of pollutants washed out from the ground. This initial rainwater runoff enters the tank 2 through the rainwater grate 1. The rainwater grate can intercept larger objects, preventing the device from clogging and acting as a filter. After the rainwater runoff enters the tank 2, the rainwater in the tank 2 cannot be directly discharged because the intercepting sealing plate 6 blocks the drain pipe 8, and the water level in the tank 2 begins to rise. At this time, the check baffle 10 naturally droops outwards, without blocking the overflow outlet 9. When the water level rises to the lower edge of overflow outlet 9, rainwater runoff begins to overflow from overflow outlet 9 and enters the sunken green space outside overflow outlet 9; at this time, the water level in tank 2 remains stable, and rainwater runoff continues to enter tank 2 through rain grate 1 and overflow into the sunken green space through overflow outlet 9; since the sunken green space has no other drainage outlets, the water level in the sunken green space begins to rise; when the water level in the sunken green space rises to the lower edge of overflow outlet 9, the water level in tank 2 is the same as that in the sunken green space outside overflow outlet 9. The water level remains constant and rises simultaneously; at this time, the floating buoy 4 inside the buoy component 3 rises simultaneously with the water level; the pull rope 5 connected to the bottom of the buoy 4 is gradually straightened, the buoy 4 stops rising, the water level continues to rise, the submerged part of the buoy 4 gradually increases, the buoyancy gradually increases, and the pulling force on the sealing cover 6 through the pull rope 5 gradually increases; when the water level rises to the device's set position H2, the amount of water entering the sunken green space has reached the requirement for initial rainwater diversion and interception, that is, the water level H is reached. 4; At this time, the buoyancy of the float 4 is sufficient to open the intercepting sealing plate 6. After the intercepting sealing plate 6 is opened, it is pushed against the inner wall of the tank 2 by the water in front of the plate, and the drain pipe 8 will enter the drainage state; the water level in the tank 2 drops rapidly, the float 4 in the float component 3 drops and resets, the water level H4 in the sunken green space outside the overflow port 9 is higher than the water level in the tank 2, the initial rainwater runoff in the sunken green space wants to flow back into the tank 2, and water will surge at the overflow port 9, the floating check baffle 1 0 is pushed back to overflow outlet 9 by the gushing water and the overflow outlet 9 is blocked. Due to the pressure formed by the high water level outside the box 2, the check baffle 10 will be pressed against the overflow outlet 9, preventing the initial rainwater runoff that has been diverted and intercepted into the sunken green space from flowing back to the drainage pipe 8. This allows the initial rainwater runoff and pollutants in the water to be independently intercepted, purified in situ in the sunken green space and infiltrated to replenish the groundwater. The rainwater with less pollutants in the later stage will enter the drainage network through the drainage pipe 8 and be discharged into the final receiving water body.

[0040] In the later stages of the intelligent diversion and interception process, as rainfall decreases or stops, the water flow from the drain pipe 8 inside the tank 2 decreases, and the intercepting sealing plate 6 naturally drops and resets, sealing the drain pipe 8. Water accumulates inside the tank 2, and the water level rises. If the water level in the sunken green space drops after infiltration, the check baffle 10 naturally drops and opens. Water in the tank 2 can still overflow into the sunken green space through the overflow port 9. Although the overflowing water is no longer the initial rainwater runoff with high pollutant concentrations, it can still serve as in-situ replenishment of groundwater resources, while simultaneously reducing the flow load on the terminal rainwater pipe network. To reduce urban flooding; when the water level rises to the set level, the intercepting sealing plate 6 opens again, the drainage pipe 8 drains water again, and the check baffle 10 closes the overflow outlet 9 again, completing another diversion and interception opening and closing process; repeatedly replenishing water to the sunken green space until the rainfall stops and no more rainwater enters the box 2, the initial rainwater runoff pollution trapped in the sunken green space is continuously purified and infiltrated; the float 4, the intercepting sealing plate 6, and the check baffle 10 automatically reset, and the device returns to its original installation state, waiting for the next diversion and interception of initial rainwater runoff in the sunken green space.

[0041] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A smart diversion and interception device for initial rainwater runoff pollution in sunken green spaces, characterized in that: The box includes a housing (2), a rain grate (1) is provided on one side of the upper end of the housing (2), a float (3) is provided in the middle of the upper end of the side wall of the housing (2), the float (3) is a hollow rectangle, a hollow float (4) is provided in the float (3), a number of holes are provided on the bottom surface of the float (3), the float (4) is connected to a pull rope (5), the end of the pull rope (5) away from the float (3) is connected to a flow-blocking sealing plate (6), a sealing plate hinge (7) is provided on the side of the flow-blocking sealing plate (6), and the flow-blocking sealing plate (6) can be wound around the sealing plate hinge (7). When the rotating shaft rotates, the sealing plate hinge (7) connects to the bottom surface of the box (2). The bottom surface of the box (2) is provided with a drain pipe (8). When the intercepting sealing plate (6) rotates around the sealing plate hinge (7) to a horizontal position to block the opening of the drain pipe (8), the center of the intercepting sealing plate (6) overlaps with the center of the opening of the drain pipe (8). An overflow port (9) is provided on the upper port of the box (2) opposite to one side of the rain grate (1). A check baffle (10) is provided at the lower edge of the overflow port (9) to cooperate with it. A cover plate (12) is provided on the top of the box (2). The check baffle (10) and the overflow port (9) are both rectangular in shape. The width of the check baffle (10) is slightly larger than the width of the overflow port (9). A baffle hinge (11) is provided on the box (2) at the lower edge of the overflow port (9). The check baffle (10) is set on the side wall of the box (2) through the baffle hinge (11). The rotation axis of the baffle hinge (11) coincides with the lower edge of the rectangular overflow port (9). The overall density of the check baffle is smaller than that of water, and it can float around the rotation axis of the baffle as the water level rises and falls. The overflow port of the device is aligned with the sunken green space, and the lower edge of the overflow port is higher than the bottom surface of the sunken green space.

2. The intelligent diversion and interception device for initial rainwater runoff pollution in sunken green spaces according to claim 1, characterized in that: The structure of the float component (3) is a cuboid, and the diameter of the float (4) is slightly smaller than the side length of the cuboid section of the float component (3).

3. The intelligent diversion and interception device for initial rainwater runoff pollution in sunken green spaces according to claim 1, characterized in that: The intercepting sealing plate (6) is a circular plate with a diameter slightly larger than that of the drain pipe (8).

4. The intelligent diversion and interception device for initial rainwater runoff pollution in sunken green spaces according to claim 1, characterized in that: A rubber lining is provided on the side of the intercepting sealing plate (6) that is close to the drain pipe (8).

5. The intelligent diversion and interception device for initial rainwater runoff pollution in sunken green spaces according to claim 1, characterized in that: The side of the sealing plate hinge (7) and the float (3) is aligned with the bottom surface of the box (2), so that the angle between the sealing plate (6) and the bottom surface is 90° when the float (4) is lifted by the pull rope (5).

6. The intelligent diversion and interception device for initial rainwater runoff pollution in sunken green spaces according to claim 1, characterized in that: A rubber liner is provided on the side of the check baffle (10) near the overflow port (9).

7. The intelligent diversion and interception device for initial rainwater runoff pollution in sunken green spaces according to claim 1, characterized in that: The water level H2 when the float pulls the flow-blocking sealing plate is higher than the horizontal centerline H3 when the check baffle is upright.

8. The method of using the intelligent diversion and interception device for initial rainwater runoff pollution in sunken green spaces as described in any one of claims 1-7, characterized in that: Includes the following steps: Step 1: Install the intelligent diversion and interception device for initial rainwater runoff pollution in the sunken green space at the connection point between the rainwater collection surface outflow and the nearby sunken green space. Step 2: During precipitation, rainwater collects on the underlying surface to form rainwater runoff. The initial rainwater runoff enters the device through the rainwater grate (1). The intercepting sealing plate (6) naturally hangs down under the action of gravity to block the opening of the drainage pipe (8). When the sunken green space is emptied, the check baffle naturally hangs down to the side of the sunken green space. The initial rainwater runoff enters the sunken green space through the overflow port (9) of the device box. The sunken green space begins to accumulate and collect the initial rainwater runoff. Step 3: Rainwater runoff continuously enters the sunken green space, causing the water level in the sunken green space to rise. The water level in the box (2) rises synchronously, and the float (4) rises synchronously with the water level in the box (2). The pull rope (5) is pulled up as the float (4) rises. After the pull rope (5) is straightened, the water level continues to rise, and the float stops rising. The submersion of the float increases, and the buoyancy of the float increases. The water level rises to the zero-level water level H2 of the discharge, and the buoyancy of the float increases to the point where it can pull the intercepting sealing plate (6). The water in the box (2) quickly rushes into the lower discharge. When the water pipe (8) drains water, the intercepting sealing plate (6) is pushed towards the side wall of the box (2). The water level in the box (2) drops, and the water in the sunken green space wants to flow back to the box. At this time, the check baffle (10) is pushed towards the box (2). Since the width of the check baffle (10) is greater than the width of the overflow port, the check baffle (10) closes the overflow port (9). The initial rainwater runoff is intercepted in the sunken green space, and the later rainwater runoff is directly discharged through the drainage pipe (8) into the underground rainwater drainage pipe. Step 4: When the rainwater runoff stops entering the device, the intercepting sealing plate (6) falls to block the drainage outlet, waiting for the collection of the initial rainwater runoff of the next rainfall to start. The pollutants in the initial rainwater runoff are intercepted in the sunken green space and purified and utilized by the green space plants and infiltrated. After a certain period of time, the water level drops, and the backflow baffle (10) hangs down naturally, waiting to intercept and divert the initial rainwater runoff of the next rainfall.

9. The method of using the intelligent diversion and interception device for initial rainwater runoff pollution in sunken green spaces as described in claim 8, characterized in that: In step one, during device installation, the elevation H1 of the lower edge of the rain grate and the elevation H0 of the lower edge of the rainwater runoff collection area outlet satisfy H0>H1. The overflow outlet of the device is aligned with the sunken green space, and the lower edge of the overflow outlet is higher than the bottom surface of the sunken green space. The elevation H1 of the lower edge of the rain grate (1) is higher than the water level elevation H2 when the float pulls the intercepting sealing plate (6), i.e., H1>H2, ensuring that the device can take in water under any circumstances without affecting the drainage of the rainwater collection surface. The effective volume V of the sunken green space for initial rainwater runoff absorption can be determined by calculating the catchment area S and the initial precipitation to be collected, where V=S×D. The precipitation D is the precipitation when more than 80% of the total pollutant migration from the underlying surface runoff occurs during a single precipitation event. Then, based on the effective volume V, the area and average depth of the sunken green space, the water surface elevation H4 at the effective volume is calculated. This determines the water level to be maintained in the sunken green space when the intelligent diversion and interception device stops collecting rainwater runoff, ensuring that the collected rainwater runoff meets the requirements for runoff pollution collection. The intelligent diversion and interception device is installed according to this water level requirement, so that the interception stop water level of the device is consistent with the effective water depth required by the sunken green space, i.e., H2=H4. Finally, the device's drainage pipe is connected to the underground rainwater drainage pipe, and the device installation is completed.

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