A rainwater infiltration device and method for mitigating waterlogging

Abstract

The application discloses a rainwater infiltration equipment and method for relieving waterlogging, and relates to the technical field of waterlogging drainage equipment. The equipment comprises a shell, a well lid device and a waterlogging drainage device. The waterlogging drainage speed is controlled by water level change in the shell. An adjusting column for controlling the well lid device to open and drain waterlogging is rotatably connected in the shell. A filter layer is arranged at the bottom end of the shell, and a plurality of waterlogging drainage holes are arranged on the filter layer. When it rains heavily, the water level in the shell rises, the floating ball rises, the movable frame rises, the blocking block rises, the waterlogging drainage holes are exposed, water is rapidly drained, the movable frame rises at the same time, and the adjusting column rotates. The adjusting column rotates, the first adjusting block slides along the adjusting column, the supporting rod pushes the split lid to tilt and open, rainwater rapidly enters the shell, and is drained into the underground pipeline through the waterlogging drainage holes. The waterlogging drainage speed is automatically controlled by the waterlogging drainage device and the well lid device according to the rain amount through the linkage of the adjusting column.

Description

Technical Field

[0001] This invention relates to the field of drainage equipment technology, and in particular to a rainwater infiltration device and method for alleviating urban flooding. Background Technology

[0002] Urban flooding refers to the phenomenon of water accumulation in cities caused by heavy or continuous rainfall exceeding the city's drainage capacity. With technological advancements, major cities have constructed sophisticated urban drainage systems that utilize underground pipe systems in conjunction with surface manholes to drain rainwater from the city.

[0003] Chinese invention patent application CN117005527A discloses a drainage device and method, including a well base and a cover mounted on the well base. The cover has two symmetrically arranged drainage holes. Two water guide pipes corresponding to the drainage holes are fixedly installed at the bottom of the cover. A sleeve with a sealed bottom is slidably mounted on each water guide pipe. Multiple siphon tubes arranged in a circular array are installed at the bottom of the sleeve. Multiple evenly distributed drainage strips are provided on the cover. A common mounting frame is fixedly connected between two of the sleeves. Multiple sealing plates adapted to the drainage strips are fixedly mounted on the mounting frame. A tension spring is provided between the mounting frame and the cover. Under normal conditions, the sealing plates block the drainage strips. This drainage device can intelligently control the drainage speed according to the amount of rainfall, resulting in better drainage performance.

[0004] In the above technical solution, the drainage speed is controlled by the weight of the spring and the mounting bracket. However, the spring is prone to rusting during long-term use, which reduces its elasticity and causes the drainage function of the entire device to gradually fail. In addition, if the size of the drainage strip and the sealing plate remains unchanged, there is an upper limit to the drainage capacity. This affects the drainage speed during heavy rain and storms, meaning that the drainage speed cannot be adjusted according to the amount of rainfall. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide a rainwater infiltration device and method for alleviating urban flooding, which controls the drainage speed according to the amount of rainfall.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A rainwater seepage device for mitigating urban flooding includes: a shell, a manhole cover device installed at the top of the shell, and a drainage device installed at the bottom of the shell. The drainage device controls the drainage speed by changing the water level inside the shell. An adjusting column for controlling the opening of the manhole cover device for drainage is rotatably connected inside the shell. A filter layer is provided at the bottom of the shell, and the filter layer has several drainage holes. An anti-backflow device is also provided between the manhole cover device and the drainage device.

[0008] The manhole cover device includes a cover ring, several sub-covers hinged to the cover ring, a first adjusting block slidably sleeved on the adjusting column, and a support rod that is hinged to the bottom surface of the sub-covers and the side surface of the first adjusting block.

[0009] This setting allows the first adjusting block to move up and down, adjusting the tilt angle of the cover via the support rod, thereby controlling the speed at which rainwater enters.

[0010] The drainage device includes a movable frame slidably sleeved on the adjusting column, a number of floats set on the movable frame, and a number of blocking components set at the top of the drainage hole; the blocking components are connected to the floats one by one, and the movable frame is connected to the inner wall of the housing through a number of spring rods;

[0011] This feature addresses the issue of insufficient leakage in the filter layer within the housing. When the water level rises, a float causes the movable frame to rise, and a connecting rod pulls the blockage block upwards to expose the drainage hole for rapid drainage.

[0012] The upper section of the adjusting column has a third spiral groove that is threadedly connected to the first adjusting block on its side wall, and the lower section of the adjusting column has a first spiral groove that is threadedly connected to the movable frame on its side wall; the first spiral groove and the third spiral groove have the same spiral direction and spiral upward, and the pitch of the first spiral groove is greater than the pitch of the third spiral groove.

[0013] In this setup, the adjusting column links the drainage device and the manhole cover device. When the drainage device opens the drainage hole, it drives the adjusting column to rotate, thereby opening and closing the manhole cover device.

[0014] As a further improvement to this technical solution, the inner sidewall of the cover ring is provided with several mounting seats. The number of mounting seats, the sub-covers and the support rods are equal and their positions correspond one-to-one. The bottom of the inner end of the cover ring is provided with a fixing frame. The center of the annular sidewall of the sub-cover is welded and fixed with a hinged protrusion that matches the mounting seat. Several water leakage holes are opened on the sub-cover. Several sub-covers form a complete circular cover.

[0015] The matching hinge protrusion and mounting base in this setting allow the sub-caps and cap ring to be hinged, facilitating the opening and closing of the complete cap body formed by several sub-caps.

[0016] As a further improvement to this technical solution, a first protrusion adapted to the third spiral groove is welded and fixed inside the first adjusting block, and a second hinge seat is welded and fixed to each side wall of the first adjusting block.

[0017] The first protrusion and the third spiral groove in this setting allow the first adjusting block to move up and down as the adjusting column rotates, thereby controlling the tilt angle of the cover.

[0018] As a further improvement to this technical solution, the movable frame includes a second adjusting block adapted to the adjusting column and several support rods welded and fixed to the outer wall of the second adjusting block. The float is sleeved and fixed on the support rods. The number of support rods, the floats and the blocking components are equal and their positions correspond one-to-one.

[0019] As a further improvement to this technical solution, a second protrusion adapted to the first spiral groove is welded and fixed inside the second adjusting block, and the outer surface of the spring rod is coated with a waterproof coating.

[0020] In both of these settings, the float rises, the movable frame rises accordingly, and the second protrusion slides along the first spiral groove, thereby causing the adjusting column to rotate.

[0021] As a further improvement to this technical solution, the blocking component includes a mounting bracket disposed on the filter layer, a blocking block slidably connected to the mounting bracket, and a connecting rod connected to the center of the top of the blocking block, the other end of which is connected to the bottom of the corresponding float.

[0022] As a further improvement to this technical solution, a number of sliders that are slidably connected to the mounting bracket are welded and fixed to the side wall of the blocking block, and a number of spiral blades are welded and fixed to the bottom end of the blocking block.

[0023] In both of these settings, the float pulls the blocking block upwards via the connecting rod, exposing the drainage hole. The spiral blades create a vortex when rainwater enters the drainage hole, accelerating the drainage of rainwater into the underground pipes.

[0024] As a further improvement to this technical solution, the inner sidewall of the housing is provided with a second sliding groove of a matching size at the corresponding position of the support rod, the inner sidewall of the housing is provided with a first hinge seat at the end of the spring rod, and the bottom end of the housing is provided with several drainage holes;

[0025] In this configuration, the second slide rail is used to limit the movement of the movable frame, allowing it to move up and down along the second slide rail.

[0026] As a further improvement to this technical solution, the anti-backflow device includes a third adjusting block that is slidably sleeved on the adjusting column, a float plate that is adhered and fixed to the outer wall of the third adjusting block, and a waterproof frame set on the float plate; the waterproof frame and the float plate are connected by several columns, and several long strips that are equal in number, size and position to the drain holes are welded and fixed to the top of the waterproof frame.

[0027] As a further improvement to this technical solution, the adjusting column has a second spiral groove on the side wall of the anti-backflow device part. The spiral direction of the second spiral groove is opposite to that of the first spiral groove. The inner side wall of the housing has a first sliding groove that matches the extension rod of the waterproof frame.

[0028] When the underground pipe is full of water, the rising water level pushes the waterproof frame upward, while the adjusting column rotates in the opposite direction, the cover closes, and the long strip extends into the drain hole to block it, preventing water in the underground pipe from flowing back to the ground.

[0029] As a further improvement to this technical solution, a limit ring is welded and fixed to the bottom end of the third spiral groove on the outer wall of the adjusting column, and the bottom layer of the filter layer is filled with fine sand and the top layer is filled with volcanic rock.

[0030] The volcanic rock and fine sand filling the filter layer in this feature can filter rainwater flowing into the underground pipes, preventing blockages.

[0031] On the other hand, the present invention also provides a method for mitigating rainwater seepage caused by urban flooding, which, using the above-mentioned rainwater seepage mitigation device, includes the following steps:

[0032] S1. When it rains lightly, rainwater enters the casing through the drain hole, then flows into the underground pipe through the filter layer.

[0033] S2. During heavy rain, if the filter layer does not leak in time, the amount of rainwater inside the shell increases, the water level rises, the float rises accordingly, which drives the movable frame to rise, the spring rod bends, the connecting rod pulls the blockage block to rise, and the drainage hole is exposed for rapid drainage.

[0034] S3. As the movable frame rises, the second protrusion slides along the first spiral groove, causing the adjusting column to rotate. As the adjusting column rotates, it pushes the first adjusting block to slide upward along the adjusting column through the third spiral groove and the first protrusion. The angle between the support rod and the horizontal plane decreases, pushing the cover to tilt and open, allowing rainwater to quickly enter the housing.

[0035] S4. When the water level drops, the spring rod pushes the movable frame down, which in turn causes the blocking block to block the drainage hole through the connecting rod.

[0036] S5. As the movable frame moves down, the second protrusion slides along the first spiral groove, causing the adjusting column to rotate in the opposite direction. As the adjusting column rotates in the opposite direction, the first adjusting block moves down, allowing the cover to return to a horizontal state.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] 1. The present invention provides a rainwater seepage device and method for alleviating urban flooding. As the movable frame rises, the second protrusion slides along the first spiral groove, causing the adjusting column to rotate. As the adjusting column rotates, it pushes the first adjusting block to slide upward along the adjusting column through the third spiral groove and the first protrusion. The angle between the support rod and the horizontal plane decreases, pushing the cover to tilt and open, allowing rainwater to quickly enter the housing and then be discharged into the underground pipe through the drainage hole. The drainage device and the manhole cover device, which are interconnected by the adjusting column, can automatically control the drainage speed according to the amount of rainfall.

[0039] 2. The rainwater leakage device and method of the present invention alleviates waterlogging. During heavy rain, if the filter layer does not leak in time, the amount of rainwater inside the shell increases, the water level rises, the float rises accordingly, driving the movable frame to rise, and the connecting rod pulls the blocking block to rise, exposing the drainage hole for rapid drainage. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of the rainwater infiltration device of the present invention;

[0041] Figure 2 This is a cross-sectional view of the overall structure of the rainwater infiltration device of the present invention;

[0042] Figure 3 This is an exploded view of the overall structure of the rainwater infiltration device of the present invention;

[0043] Figure 4 This is a cross-sectional view of the shell structure of the present invention;

[0044] Figure 5 This is an exploded view of the manhole cover device structure of the present invention;

[0045] Figure 6 This is a cross-sectional view of the first adjusting block structure of the present invention;

[0046] Figure 7 This is an exploded view of the drainage device structure of the present invention;

[0047] Figure 8 This is a schematic diagram of the movable frame structure of the present invention;

[0048] Figure 9 This is an exploded view of the blocking component structure of the present invention;

[0049] Figure 10 This is a schematic diagram of the blocking block structure of the present invention;

[0050] Figure 11 This is an exploded view of the anti-backflow device structure of the present invention;

[0051] Figure 12 This is a cross-sectional view of the third adjusting block structure of the present invention.

[0052] The meanings of the labels in the diagram are as follows:

[0053] 1. Housing; 11. First slide groove; 12. Second slide groove; 13. First hinge seat; 14. Drain hole;

[0054] 2. Manhole cover device; 21. Cover ring; 211. Mounting base; 212. Fixing frame; 22. Separate cover; 221. Leakage hole; 222. Hinge protrusion; 23. Support rod; 24. First adjusting block; 241. First protrusion; 242. Second hinge base;

[0055] 3. Anti-backflow device; 31. Waterproof frame; 311. Long strip block; 32. Column; 33. Third adjusting block; 331. Third protrusion; 34. Float plate;

[0056] 4. Drainage device; 41. Blocking component; 411. Mounting frame; 412. Blocking block; 4121. Spiral blade; 4122. Sliding block; 413. Connecting rod; 42. Movable frame; 421. Second adjusting block; 422. Support rod; 423. Second protrusion; 43. Float; 44. Spring rod;

[0057] 5. Adjusting column; 51. First spiral groove; 52. Second spiral groove; 53. Limiting ring; 54. Third spiral groove;

[0058] 6. Filter layer; 61. Drainage hole. Detailed Implementation

[0059] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, and these should all be considered to fall within the scope of the invention. The terms "installation" and "connection" should be interpreted broadly, referring to direct connection or indirect connection through an intermediate medium.

[0060] The terms "central axis," "vertical," "horizontal," "front," "rear," "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer" used herein to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of the invention, "a number" means two or more, unless otherwise explicitly specified.

[0061] In one embodiment of the present invention, a rainwater infiltration device for mitigating urban flooding is described in [reference needed]. Figure 2 As shown, it includes: a shell 1, a manhole cover device 2 installed at the top of the shell 1, and a drainage device 4 installed at the bottom of the shell 1; the drainage device 4 controls the drainage speed by changing the water level inside the shell 1, and an adjusting column 5 is rotatably connected inside the shell 1 to control the opening of the manhole cover device 2 for drainage. A filter layer 6 is provided at the bottom of the shell 1, and a plurality of drainage holes 61 are provided on the filter layer 6.

[0062] Please see Figure 1 and Figure 5As shown, the manhole cover device 2 includes: a cover ring 21, several sub-covers 22 hinged to the cover ring 21, a first adjusting block 24 slidably sleeved on the adjusting column 5, and a support rod 23 that is hinged to the bottom surface of the sub-covers 22 and the side surface of the first adjusting block 24 respectively; the first adjusting block 24 moves up and down, and the tilt angle of the sub-covers 22 is adjusted by the support rod 23, thereby controlling the speed at which rainwater enters.

[0063] Please see Figure 7 As shown, the drainage device 4 includes: a movable frame 42 slidably sleeved on the adjusting column 5, a plurality of floats 43 disposed on the movable frame 42, and a plurality of blocking components 41 disposed at the top of the drainage hole 61; the blocking components 41 are connected to the floats 43 in a one-to-one correspondence, and the movable frame 42 is connected to the inner wall of the housing 1 through a plurality of spring rods 44.

[0064] Please see Figure 3 As shown, the upper part of the adjusting column 5 has a third spiral groove 54 that is threadedly connected to the first adjusting block 24 on its side wall, and the lower part of the adjusting column 5 has a first spiral groove 51 that is threadedly connected to the movable frame 42 on its side wall. The first spiral groove 51 and the third spiral groove 54 have the same spiral direction and spiral upward, and the pitch of the first spiral groove 51 is greater than the pitch of the third spiral groove 54. The adjusting column 5 makes the drainage device 4 and the manhole cover device 2 work together. When the drainage device 4 opens the drainage hole 61, it drives the adjusting column 5 to rotate, thereby making the manhole cover device 2 open and close.

[0065] Specifically, in combination Figure 3 , Figure 5 and Figure 6 As shown, a first protrusion 241 adapted to the third spiral groove 54 is welded and fixed inside the first adjusting block 24. When the adjusting column 5 rotates, the first adjusting block 24 moves up and down accordingly. A second hinge seat 242 is welded and fixed to each side wall of the first adjusting block 24. The second hinge seat 242 is used to hinge with the support rod 23.

[0066] Furthermore, a limiting ring 53 is welded and fixed to the bottom of the third spiral groove 54 on the outer wall of the regulating column 5. The bottom layer of the filter layer 6 is filled with fine sand and gravel, and the top layer is filled with volcanic rock. The volcanic rock and fine sand can filter the rainwater discharged into the underground pipe and prevent the underground pipe from being blocked.

[0067] Specifically, in combination Figure 7 and Figure 8As shown, the movable frame 42 includes: a second adjusting block 421 adapted to the adjusting column 5 and several support rods 422 welded and fixed to the outer wall of the second adjusting block 421; a float 43 is sleeved and fixed on the support rod 422, and the number of support rods 422, floats 43 and blocking parts 41 are equal and their positions correspond one-to-one. A second protrusion 423 adapted to the first spiral groove 51 is welded and fixed inside the second adjusting block 421. The outer surface of the spring rod 44 is coated with a waterproof coating. When the float 43 rises, the movable frame 42 rises accordingly, and the second protrusion 423 slides along the first spiral groove 51, thereby causing the adjusting column 5 to rotate accordingly.

[0068] It is worth noting that, please refer to Figure 9 and Figure 10 As shown, the blocking component 41 includes: a mounting bracket 411 disposed on the filter layer 6, a blocking block 412 slidably connected to the mounting bracket 411, and a connecting rod 413 connected to the center of the top of the blocking block 412; the other end of the connecting rod 413 is connected to the bottom end of the corresponding float 43. When the filter layer 6 in the housing 1 leaks in time and the water level rises, the float 43 drives the movable bracket 42 to rise, and the connecting rod 413 pulls the blocking block 412 to rise and expose the drainage hole 61 for rapid drainage; a number of sliders 4122 that are slidably connected to the mounting bracket 411 are welded and fixed to the side wall of the blocking block 412, and a number of spiral blades 4121 are welded and fixed to the bottom end of the blocking block 412. The spiral blades 4121 are arranged so that rainwater forms a vortex when entering the drainage hole 61, accelerating the rainwater to drain into the underground pipe.

[0069] For further details, please refer to Figure 4 As shown, the inner wall of the housing 1 is provided with a second sliding groove 12 of a matching size at the corresponding position of the support rod 422. The inner wall of the housing 1 is provided with a first hinge seat 13 at the end of the spring rod 44. The bottom end of the housing 1 is provided with several drainage holes 14. The second sliding groove 12 is used to limit the movable frame 42, so that the movable frame 42 can move up and down along the second sliding groove 12.

[0070] For details, please refer to Figure 5 As shown, the inner wall of the cover ring 21 is provided with several mounting seats 211. The number of mounting seats 211, sub-covers 22 and support rods 23 are equal and their positions correspond one-to-one. The bottom inner end of the cover ring 21 is provided with a fixing frame 212. The center of the annular side wall of the sub-cover 22 is welded and fixed with a hinge protrusion 222 that matches the mounting seat 211. Several drainage holes 221 are opened on the sub-cover 22. Several sub-covers 22 form a complete circular cover. The matching hinge protrusion 222 and the mounting seat 211 make the sub-cover 22 hinged to the cover ring 21, which facilitates the opening and closing of the complete cover formed by the sub-covers 22.

[0071] In addition, combined Figure 5 , Figure 11 and Figure 12As shown, a backflow prevention device 3 is provided between the manhole cover device 2 and the drainage device 4. The backflow prevention device 3 includes a third adjusting block 33 slidably sleeved on the adjusting column 5, a float plate 34 adhered and fixed to the outer wall of the third adjusting block 33, and a waterproof frame 31 set on the float plate 34. The waterproof frame 31 and the float plate 34 are connected by several columns 32. Several long strips 311, equal in number, size, and position to the drain holes 14, are welded and fixed to the top of the waterproof frame 31. A third protrusion 331 is welded and fixed to the inner wall of the third adjusting block 33. The adjusting column 5 is connected to the backflow prevention device 3. A second spiral groove 52 is provided on the side wall of the part. The spiral direction of the second spiral groove 52 is opposite to that of the first spiral groove 51. A first sliding groove 11 is provided on the inner side wall of the housing 1 to match the extension rod of the waterproof frame 31. When the underground pipe is full of water, water enters the housing 1, the water level rises, pushes the float 34 to rise, and pushes the waterproof frame 31 to rise. At the same time, under the action of the third protrusion 331 and the second spiral groove 52, the adjusting column 5 rotates in the opposite direction, the first adjusting block 24 moves down, the cover 22 closes, and the long strip 311 extends into the drain hole 14 to block it, preventing water in the underground pipe from flowing back to the ground.

[0072] This embodiment also provides a method for mitigating rainwater seepage caused by urban flooding, using the aforementioned rainwater seepage mitigation device, including the following steps:

[0073] S1. When it rains lightly, rainwater enters the housing 1 through the drain hole 221, and then flows into the underground pipe through the filter layer 6.

[0074] S2. When it rains heavily, if the filter layer 6 does not leak in time, the rainwater inside the shell 1 increases and the water level rises. The float 43 rises accordingly, which drives the movable frame 42 to rise. The spring rod 44 bends, and the connecting rod 413 pulls the blockage block 412 to rise, exposing the drainage hole 61 for rapid drainage.

[0075] S3. As the movable frame 42 rises, the second protrusion 423 slides along the first spiral groove 51, causing the adjusting column 5 to rotate. When the adjusting column 5 rotates, it pushes the first adjusting block 24 to slide up along the adjusting column 5 through the third spiral groove 54 and the first protrusion 241. The angle between the support rod 23 and the horizontal plane decreases, pushing the cover 22 to tilt and open, allowing rainwater to quickly enter the housing 1.

[0076] S4. When the water level drops, the spring rod 44 pushes the movable frame 42 to move down, which in turn causes the blocking block 412 to block the drainage hole 61 through the connecting rod 413.

[0077] S5. As the movable frame 42 moves down, the second protrusion 423 slides along the first spiral groove 51, causing the adjusting column 5 to rotate in the opposite direction. When the adjusting column 5 rotates in the opposite direction, the first adjusting block 24 moves down, so that the cover 22 returns to a horizontal state.

[0078] It should be noted that the above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A rainwater infiltration device for alleviating internal flooding, comprising: The shell (1), the well lid device (2) installed on the top of the shell (1) and the drainage device (4) installed on the bottom of the shell, characterized in that: the drainage device (4) controls the drainage speed through the water level change in the shell, the inside of the shell (1) is rotatably connected with the adjusting column (5) for controlling the opening of the well lid device and the drainage, the bottom of the shell (1) is provided with the filter layer (6), a plurality of drainage holes (61) are arranged on the filter layer (6), and a plurality of downcomer holes (14) are arranged on the bottom of the shell (1); the well lid device (2) and the drainage device (4) are further provided with the anti-backwater device (3); The well lid device (2) comprises the cover ring (21), a plurality of sub-lids (22) hingedly connected to the cover ring, the first adjusting block (24) slidably sleeved on the adjusting column (5), and the support rod (23) hingedly connected to the bottom surface of the sub-lid and the side surface of the first adjusting block; The drainage device (4) comprises the movable frame (42) slidably sleeved on the adjusting column, a plurality of floating balls (43) arranged on the movable frame, and a plurality of blocking pieces (41) arranged on the top of the drainage hole (61); the blocking piece (41) is connected with the floating ball (43) one by one, and the movable frame (42) is connected with the inner side wall of the shell (1) through a plurality of spring rods (44); The upper section of the adjusting column (5) is provided with the third spiral groove (54) on the side wall, the lower section of the adjusting column (5) is provided with the first spiral groove (51) on the side wall, the first spiral groove (51) and the third spiral groove (54) have the same spiral direction and spiral upward, and the pitch of the first spiral groove (51) is greater than that of the third spiral groove (54); The movable frame (42) comprises the second adjusting block (421) matched with the adjusting column (5) and a plurality of support rods (422) welded and fixed on the outer side wall of the second adjusting block, the floating ball (43) is sleeved and fixed on the support rod (422), and the number of the support rod (422), the floating ball (43) and the blocking piece (41) is equal and the positions are one by one corresponding; The anti-backwater device (3) comprises the third adjusting block (33) slidably sleeved on the adjusting column (5), the floating plate (34) adhesively fixed on the outer side wall of the third adjusting block (33), and the waterproof frame (31) arranged on the floating plate (34); the waterproof frame (31) and the floating plate (34) are connected through a plurality of vertical columns (32), and the top of the waterproof frame (31) is welded with a plurality of long blocks (311) which are equal in number, matched in size and one by one corresponding in position with the downcomer holes (14); The adjusting column (5) is provided with the second spiral groove (52) on the side wall of the anti-backwater device (3) part, the spiral direction of the second spiral groove (52) is opposite to that of the first spiral groove (51), and the inner side wall of the shell (1) is provided with the first sliding groove (11) matched with the outer extension rod of the waterproof frame (31).

2. The rainwater infiltration apparatus for mitigating waterlogging according to claim 1, wherein: A plurality of mounting seats (211) are arranged on the inner side wall of the cover ring (21), the mounting seats (211), the sub-cover (22) and the support rod (23) are equal in number and one-to-one in position; A fixed frame (212) is arranged at the bottom end of the cover ring (21), a hinge protrusion (222) matched with the mounting seat (211) is welded and fixed at the center of the annular side wall of the sub-cover (22), a plurality of water leakage holes (221) are arranged on the sub-cover (22), and the plurality of sub-covers (22) form a complete circular cover body.

3. The rainwater infiltration apparatus for mitigating waterlogging according to claim 2, wherein: A first protrusion (241) matched with the third spiral groove (54) is welded and fixed in the first adjusting block (24), and a second hinge seat (242) is welded and fixed on each side wall of the first adjusting block (24).

4. The rainwater infiltration apparatus for mitigating waterlogging according to claim 3, wherein: A second protrusion (423) matched with the first spiral groove (51) is welded and fixed in the second adjusting block (421), and a waterproof coating is coated on the outer surface of the spring rod (44).

5. The rainwater infiltration apparatus for mitigating waterlogging according to claim 4, wherein: The blocking piece (41) comprises a mounting frame (411) arranged on the filter layer (6), a blocking block (412) slidably connected to the mounting frame (411), and a connecting rod (413) connected to the center of the top end of the blocking block (412), and the other end of the connecting rod (413) is connected to the bottom end of the corresponding floating ball (43).

6. The rainwater infiltration apparatus for mitigating waterlogging according to claim 5, wherein: A plurality of sliding blocks (4122) slidably connected to the mounting frame (411) are welded and fixed on the side wall of the blocking block (412), and a plurality of spiral vanes (4121) are welded and fixed at the bottom end of the blocking block (412).

7. The rainwater infiltration apparatus for mitigating waterlogging according to claim 6, wherein: A second sliding groove (12) matched in size is arranged on the inner side wall of the shell (1) at the corresponding position of the support rod (422), and a first hinge seat (13) is arranged on the inner side wall of the shell (1) at the end of the spring rod (44).

8. The rainwater infiltration apparatus for mitigating waterlogging according to claim 7, wherein: A limiting ring (53) is welded and fixed on the outer side wall of the adjusting column (5) at the bottom end of the third spiral groove (54), and fine sand is filled in the bottom layer of the filter layer (6) and volcanic rock is filled in the upper layer.

9. The rainwater infiltration method for mitigating waterlogging is applied to the rainwater infiltration device for mitigating waterlogging in claim 8, characterized in that, The method comprises the following steps: S1, when it is drizzling, rainwater enters the shell through the water leakage holes, and then flows into the underground pipeline through the filter layer; S2, when it is raining heavily, the filter layer does not leak in time, the water level in the shell rises, the floating ball rises, the movable frame rises, the spring rod bends, the connecting rod pulls the blocking block to rise, the drainage hole is exposed, and the water is quickly drained; S3, when the movable frame rises, the second protrusion slides along the first spiral groove, driving the adjusting column to rotate; the adjusting column rotates, driving the first adjusting block to slide upwards along the adjusting column through the third spiral groove and the first protrusion, the angle between the support rod and the horizontal plane decreases, driving the sub-cover to tilt and open, so that the rainwater quickly enters the shell; S4, when the water level decreases, the spring rod drives the movable frame to move downwards, and the blocking block blocks the drainage hole through the connecting rod; S5, when the movable frame moves downwards, the second protrusion slides along the first spiral groove, driving the adjusting column to rotate in the opposite direction; the adjusting column rotates in the opposite direction, the first adjusting block moves downwards, and the sub-cover returns to the horizontal state.

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