Multi-stage purification and filtration device for rainwater runoff pollutants and treatment method thereof

Abstract

The application relates to the technical field of waste gas treatment, in particular to a multi-stage purification and filtration device for rainwater runoff pollutants and a treatment method thereof. The device comprises a fixed column, the inner side of the fixed column is fixedly connected with a water tank, the upper end of the water tank is fixedly connected with an upper fixed cover on the inner side, the top of the upper fixed cover is fixedly connected with an annular filter screen, the bottom of the upper fixed cover is fixedly connected with an upper filter box, the bottom of the upper filter box is detachably connected with a lower filter box, the inner side of the upper filter box is fixedly connected with an adjusting seat for adjusting the water flow direction, the bottom of the adjusting seat is detachably connected with a stabilizing seat, the top of the adjusting seat is fixedly connected with a No.2 fixed ring, and the inner sides of the adjusting seat and the stabilizing seat are provided with rotating assemblies. The upper filter box and the lower filter box are used for realizing primary filtration of rainwater, and the adjusting seat and the rotating assemblies are used for realizing shunting and pollution discharge of rainwater flow.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, and more specifically, to a multi-stage purification and filtration device for rainwater runoff pollutants and its treatment method. Background Technology

[0002] Rainwater filtration equipment is a core component of rainwater harvesting systems, primarily used to remove suspended particles, impurities, and microorganisms from rainwater to ensure water quality safety and prevent pipe blockage. With the acceleration of urbanization and increased awareness of water conservation and environmental protection, rainwater harvesting systems have been widely adopted.

[0003] Chinese Publication No. CN121570881A discloses a rainwater collection and purification device for landscape bridges based on multi-stage filtration. The device includes a primary filtration mechanism, a secondary filtration mechanism, a buffer mechanism, and a collection tank. The buffer mechanism is installed inside the collection tank. The primary filtration mechanism is located on top of the collection tank and connected to the buffer mechanism. The secondary filtration mechanism is mounted on the buffer mechanism. A drainage mechanism is also provided inside the collection tank. A water storage component is located on the outside of the collection tank, and a drainage mechanism is located inside the water storage component. This invention's primary and secondary filtration mechanisms enable multiple filtrations of rainwater, ensuring both efficiency and quality. Even when leaves and larger impurities in the rainwater clog the top of the primary filtration mechanism, the rainwater can still be collected into the collection tank through the combined action of the collection tank and the primary filtration mechanism, thus improving the efficiency and quality of rainwater treatment.

[0004] Although the aforementioned patents have been approved, considering that the use of primary and secondary rainwater filtration mechanisms can filter rainwater multiple times, ensuring the efficiency and quality of rainwater filtration and improving treatment efficiency, most devices cannot meet the different filtration requirements of rainwater in different scenarios.

[0005] In view of this, we propose a multi-stage purification and filtration device for rainwater runoff pollutants and its treatment method. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-stage purification and filtration device and treatment method for rainwater runoff pollutants, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, on one hand, the present invention provides a multi-stage purification and filtration device for rainwater runoff pollutants, comprising a fixed column, a water tank fixedly connected to the inner side of the fixed column, an upper fixed cover fixedly connected to the upper inner side of the water tank, an annular filter screen fixedly connected to the top of the upper fixed cover, an upper filter box fixedly connected to the bottom of the upper fixed cover, a lower filter box detachably connected to the bottom of the upper filter box, an adjusting seat for adjusting the water flow direction fixedly connected to the inner side of the upper filter box, a stabilizing seat detachably connected to the bottom of the adjusting seat, a second fixing ring fixedly connected to the top of the adjusting seat, and rotating components provided on the inner sides of the adjusting seat and the stabilizing seat, wherein: The upper and lower filter boxes achieve primary filtration of rainwater, while the adjustment seat and rotating assembly work together to divert and discharge rainwater.

[0008] As a preferred embodiment of the present invention, a soft ring is fixedly connected to the top of the fixing column, the soft ring is fixedly connected to the upper outer wall of the water tank, a fixing ring is fixedly connected to the bottom of the fixing column, and a drain outlet is provided on one side of the lower end of the water tank.

[0009] As a preferred embodiment of the present invention, the bottom of the upper filter box is provided with a plurality of square notches of number one, and the top of the lower filter box is fixedly connected with an oblique protruding column. The size of the oblique protruding column matches the size of the square notches of number one, and the oblique protruding column is detachably connected to the inside of the square notches of number one. The upper filter box and the lower filter box are interconnected.

[0010] In a preferred embodiment of the present invention, a stabilizing ring is fixedly connected between the bottom of the second fixing ring and the adjusting seat. A plurality of first telescopic rods are fixedly connected to the bottom of the stabilizing ring. The first telescopic rods pass through the adjusting seat. A sliding ring is fixedly connected to the bottom of the first telescopic rod. A plurality of baffles are fixedly connected to the top of the sliding ring. The baffles are respectively located between the plurality of first telescopic rods. A plurality of second square notches are provided at the bottom of the adjusting seat. The sliding ring is slidably connected within the second square notches. The positions of the first square notches and the second square notches are matched.

[0011] In a preferred embodiment of the present invention, the inner wall of the adjusting seat is fixedly connected with a plurality of fixed sleeves, the inner side of the fixed sleeves is fixedly connected with a limiting ring, the outer wall of the limiting ring is slidably connected with a plurality of sliding plates, the plurality of sliding plates are respectively located on the inner side of the fixed sleeves, and the interior of the adjusting seat is electrically slidably connected with a buckle, the outer wall of the buckle is in contact with the inner wall of the sliding plate, and the two are in a matching position.

[0012] In a preferred embodiment of the present invention, an adsorption plate is fixedly connected to the inner wall of the stabilizing base, and multiple protruding plates are fixedly connected to the top of the stabilizing base. The positions of the protruding plates correspond to the positions of the second square notch. An interlayer is formed inside the stabilizing base, and the sliding ring is slidably connected within the interlayer. A base plate is fixedly connected to the bottom of the stabilizing base, and a funnel is fixedly connected to the center of the base plate. A connecting box is fixedly connected to the outer wall of the middle end of the funnel. Multiple leakage holes are formed on the outer wall of the part of the funnel inside the connecting box, and the connecting box is connected to the lower filter box.

[0013] In a preferred embodiment of the present invention, the rotating assembly includes a sealing plate, a motor is fixedly connected to the top of the sealing plate, and a second telescopic rod is fixedly connected to the bottom periphery of the sealing plate. The second telescopic rod has a second fixing ring fixedly connected through it at the end away from the sealing plate. The output end of the motor is fixedly connected to a rotating rod through the sealing plate.

[0014] In a preferred embodiment of the present invention, a medicine tube is fixedly connected to the outer wall of the middle end of the rotating rod, a strainer is provided on the outer side of the medicine tube, the strainer is fixedly connected to the outer wall of the rotating rod, a stirring rod is fixedly connected to the outer wall below the strainer, a third telescopic rod is fixedly connected to the bottom of the stirring rod, and a sealing plug is fixedly connected to the bottom of the third telescopic rod.

[0015] As a preferred embodiment of the present invention, the inner side of the fixed column is further provided with a water inlet chamber, a first chamber, a second chamber, a third chamber, and a fourth chamber. The water inlet chamber, the first chamber, the second chamber, the third chamber, and the fourth chamber are sequentially connected to each other. The water inlet chamber is located inside the upper fixed cover, the first chamber is located inside the lower filter box, the second chamber is located inside the connecting box, the third chamber is located in the space between the adjusting seat and the stabilizing seat, and the fourth chamber is located inside the water tank.

[0016] On the other hand, the present invention also provides a multi-stage purification and filtration device for rainwater runoff pollutants and a treatment method thereof, the operation steps of which are as follows: S1. Rainwater enters the water inlet chamber through the annular filter screen of the upper fixed cover, completing the initial interception of large particulate impurities; S2. Rainwater flows into the No. 1 chamber through the inlet chamber, completes primary filtration through the upper and lower filter boxes, and then enters the No. 2 chamber through the connecting box. S3. Rainwater enters the third chamber through the funnel's holes. The regulating seat and the stabilizing seat work together to regulate the water flow. The motor of the rotating component drives the rotating rod to rotate. The chemical tube adds the purification agent, and the stirring rod mixes the mixture to complete the purification of pollutants. S4. After purification, the rainwater enters the fourth chamber and is eventually discharged through the drain outlet.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this multi-stage purification and filtration device, the upper and lower filter boxes are connected by plugging and fitting together, which facilitates disassembly and cleaning and avoids clogging. The water flow path can be adjusted and the sewage discharge can be switched by adjusting the adjustment seat in conjunction with the sliding ring, baffle and protrusion plate, so as to achieve different levels of filtration in multiple scenarios.

[0018] 2. In this multi-stage purification and filtration device, the motor drives the rotating rod to rotate the medicine tube and the stirring rod, which ensures full diffusion of the medicine and high purification efficiency. The water inlet chamber and chambers one through four are connected in sequence, ensuring stable water flow and continuous purification process. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the multi-stage purification and filtration device of the present invention; Figure 2 This is a schematic cross-sectional view of the multi-stage purification and filtration device of the present invention; Figure 3 This is a schematic diagram of the internal chambers of the multi-stage purification and filtration device of the present invention; Figure 4 This is a three-dimensional schematic diagram of the overall unfolded multi-stage purification and filtration device of the present invention; Figure 5 This is a detailed internal cross-sectional view of the multi-stage purification and filtration device of the present invention; Figure 6 This is a partial three-dimensional schematic diagram showing the internal structure of the multi-stage purification and filtration device of the present invention. Figure 7 This is a three-dimensional schematic diagram of the internal adjustment seat of the multi-stage purification and filtration device of the present invention. Figure 8 This is a three-dimensional schematic diagram of the position of the adjustment seat in the multi-stage purification and filtration device of the present invention; Figure 9 This is a three-dimensional unfolded schematic diagram of the rotating component of the multi-stage purification and filtration device of the present invention.

[0020] The meanings of the labels in the diagram are as follows: 1. Fixed column; 11. Flexible ring; 12. Fixed ring No. 1; 2. Water tank; 21. Drain outlet; 22. Upper fixed cover; 221. Annular filter screen; 23. Upper filter box; 231. Square notch No. 1; 24. Lower filter box; 241. Slanted protruding column; 3. Adjusting seat; 31. Fixed ring No. 2; 311. Stabilizing ring; 312. Telescopic rod No. 1; 313. Sliding ring; 314. Baffle; 315. Square notch No. 2; 316. Fixed sleeve; 317. Restricting ring; 318. Sliding plate; 319. 32. Fastener; 321. Stabilizer; 322. Adsorption plate; 323. Raised plate; 324. Interlayer; 33. Base plate; 331. Funnel; 332. Leakage hole; 34. Connecting box; 4. Rotating assembly; 41. Motor; 411. Sealing plate; 412. No. 2 telescopic rod; 42. Rotating rod; 421. Medicine tube; 422. Strainer; 43. Stirring rod; 44. No. 3 telescopic rod; 45. Sealing plug; 5. Water inlet chamber; 51. No. 1 chamber; 52. No. 2 chamber; 53. No. 3 chamber; 54. No. 4 chamber. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Example 1 Please see Figures 1-9As shown, this embodiment provides a multi-stage purification and filtration device for rainwater runoff pollutants, including a fixed column 1, a water tank 2 fixedly connected to the inner side of the fixed column 1, an upper fixed cover 22 fixedly connected to the upper inner side of the water tank 2, an annular filter screen 221 fixedly connected to the top of the upper fixed cover 22, an upper filter box 23 fixedly connected to the bottom of the upper fixed cover 22, a lower filter box 24 detachably connected to the bottom of the upper filter box 23, an adjusting seat 3 for adjusting the water flow direction fixedly connected to the inner side of the upper filter box 23, a stabilizing seat 32 detachably connected to the bottom of the adjusting seat 3, a second fixing ring 31 fixedly connected to the top of the adjusting seat 3, and a rotating component 4 provided on the inner side of the adjusting seat 3 and the stabilizing seat 32. The upper filter box 23 and the lower filter box 24 achieve primary filtration of rainwater, while the adjusting seat 3 and the rotating component 4 work together to divert and discharge rainwater. A flexible ring 11 is fixedly connected to the top of the fixed column 1, and the flexible ring 11 is fixedly connected to the upper outer wall of the water tank 2. A first fixing ring 12 is fixedly connected to the bottom of the fixed column 1, and a drain outlet 21 is opened on one side of the lower end of the water tank 2.

[0024] It should be noted that the drain outlet 21 is the outlet for purified rainwater, which can be connected to an external drainage network or a reuse pipeline. The upper filter box 23 and the lower filter box 24 form a detachable primary filter unit, which is convenient for cleaning blockages. The regulating seat 3 and the stabilizing seat 32 are the core carriers for water flow regulation and deep purification. The rotating component 4 is used for chemical dosing, stirring and mixing and sewage control, realizing the integration of filtration, diversion, purification and sewage discharge.

[0025] like Figures 4-6 As shown, the bottom of the upper filter box 23 has multiple square notches 231, and the top of the lower filter box 24 is fixedly connected to an oblique protrusion 241. The size of the oblique protrusion 241 matches the size of the square notches 231. The oblique protrusion 241 is detachably connected to the inside of the square notches 231, and the upper filter box 23 and the lower filter box 24 are interconnected.

[0026] like Figures 6-7As shown, a stabilizing ring 311 is fixedly connected between the bottom of the second fixed ring 31 and the adjusting seat 3. Multiple first telescopic rods 312 are fixedly connected to the bottom of the stabilizing ring 311. The first telescopic rods 312 pass through the adjusting seat 3. A sliding ring 313 is fixedly connected to the bottom of the first telescopic rod 312. Multiple baffles 314 are fixedly connected to the top of the sliding ring 313. The multiple baffles 314 are located between the multiple first telescopic rods 312. Multiple second square notches 315 are opened at the bottom of the adjusting seat 3. The sliding ring 313 is slidably connected in the second square notch 315. The position of the first square notch 231 matches the position of the second square notch 315. Multiple fixing sleeves 316 are fixedly connected to the inner wall of the adjusting seat 3. A limiting ring 317 is fixedly connected to the inner side of the fixing sleeve 316. Multiple sliding plates 318 are slidably connected to the outer wall of the limiting ring 317. The multiple sliding plates 318 are located on the inner side of the fixing sleeve 316 respectively. A fastener 319 is electrically slidably connected inside the adjusting seat 3. The outer wall of the fastener 319 is in contact with the inner wall of the sliding plate 318, and the two are in the same position.

[0027] An adsorption plate 321 is fixedly connected to the inner wall of the stabilizing seat 32. Multiple protruding plates 322 are fixedly connected to the top of the stabilizing seat 32. The position of the protruding plates 322 matches the position of the second square notch 315. An interlayer 323 is opened inside the stabilizing seat 32. A sliding ring 313 is slidably connected in the interlayer 323. A base plate 33 is fixedly connected to the bottom of the stabilizing seat 32. A funnel 331 is fixedly connected to the center of the base plate 33. A connecting box 34 is fixedly connected to the outer wall of the middle end of the funnel 331. Multiple leakage holes 332 are opened on the outer wall of the part of the funnel 331 inside the connecting box 34. The connecting box 34 is connected to the lower filter box 24.

[0028] It should be noted that the adsorption plate 321 is an adsorption filter material used to adsorb fine suspended pollutants, the funnel 331 is used to collect rainwater and deposited dirt, the leakage hole 332 is a rainwater flow hole, and the connecting box 34 is used to connect the lower filter box 24 and the funnel 331 to realize water flow transfer.

[0029] like Figure 9 As shown, the rotating assembly 4 includes a sealing plate 411. A motor 41 is fixedly connected to the top of the sealing plate 411, and a second telescopic rod 412 is fixedly connected to the bottom periphery of the sealing plate 411. A second fixing ring 31 is fixedly connected to the end of the second telescopic rod 412 away from the sealing plate 411. The output end of the motor 41 is fixedly connected to a rotating rod 42 through the sealing plate 411. A medicine tube 421 is fixedly connected to the outer wall of the middle end of the rotating rod 42. A strainer 422 is provided on the outer side of the medicine tube 421 and is fixedly connected to the outer wall of the rotating rod 42. A stirring rod 43 is fixedly connected to the outer wall of the rotating rod 42 below the strainer 422. A third telescopic rod 44 is fixedly connected to the bottom of the stirring rod 43, and a sealing plug 45 is fixedly connected to the bottom of the third telescopic rod 44.

[0030] It should be noted that the motor 41 is the driving source of the rotating rod 42. The rotating rod 42 is driven by the motor 41 to rotate, thereby rotating the stirring rod 43 and fully mixing the medicine sprayed from the medicine tube 421 with the rainwater.

[0031] The inner side of the fixed column 1 is also provided with a water inlet chamber 5, a first chamber 51, a second chamber 52, a third chamber 53 and a fourth chamber 54. The water inlet chamber 5, the first chamber 51, the second chamber 52, the third chamber 53 and the fourth chamber 54 are connected to each other in sequence. The water inlet chamber 5 is located in the internal space of the upper fixed cover 22, the first chamber 51 is located in the internal space of the lower filter box 24, the second chamber 52 is located in the internal space of the connecting box 34, the third chamber 53 is located in the space between the adjusting seat 3 and the stabilizing seat 32, and the fourth chamber 54 is located in the internal space of the water tank 2.

[0032] Therefore, when rainwater needs to be filtered, such as Figures 1-3 As shown, during the preparation stage, the staff installs the device at the inlet of the rainwater collection pipe. After sealing and fixing the pipe opening with the soft ring 11, the entire device starts to work. Rainwater first enters the inlet chamber 5 through the annular filter 221 of the upper fixed cover 22, completing the initial interception of large particles of impurities. In the initial state, the sealing plate 411 and the second fixed ring 31 are in a closed state. Under the sensing of the external flow sensor, when the rainwater flow reaches the specified threshold, the second telescopic rod 412 drives the sealing plate 411 to lift up and form an opening. At this time, the larger particles of impurities filtered by the annular filter 221 gradually flow into the third chamber 53 through the water flow and are blocked by the adsorption plate 321. The rainwater entering the inlet chamber 5 from the annular filter 221 falls into the first chamber 51 and passes through the annular filter 221 in the lower filter box 24 to filter out smaller particles of impurities. Then the rainwater will flow down again to the connecting box 34 for temporary storage. The steps for rainwater filtration vary depending on the location. Compared to rainwater treatment in urban roads, rainwater collected in industrial areas needs to be recycled and discharged again. In addition to considering the problem of filtering impurities, it is also necessary to consider the decontamination of rainwater in industrial areas. Similarly, after rainwater is collected and initially filtered, the sealing plug 45 is opened by the drive of the third telescopic rod 44, but the electric water valve at the bottom of the funnel 331 is closed. At this time, the water level rises from the funnel 331 to the third chamber 53. When the water level is higher than the fixed sleeve 316, the first telescopic rod 312 extends and drives the sliding ring 313 and the baffle 314 to move down. As the baffle 314 moves down, the second square notch 315 forms an opening from the top. The opening is determined by the rainwater flow rate. The larger the rainwater flow rate, the larger the opening, so that the water level in the third chamber 53 is always higher than the fixed sleeve 316. At the same time, driven by the motor 41, the rotating rod 42 rotates, causing the medicine (flocculator) in the medicine tube 421 to be sprayed out and mixed with the rainwater, causing the sewage in the rainwater to flocculate and produce flocculent particles. These flocculent particles are always kept on the periphery and rotate with the water flow in the third chamber 53 due to the influence of the stirring rod 43, and are adsorbed by the adsorption plate 321, so that the filtered rainwater flows from the second square opening 315 to the fourth chamber 54 and is discharged from the drain outlet 21.

[0033] Finally, in rainless weather, when the water flow rate drops to its lowest point, the water level in chamber 53 gradually decreases, and the electric water valve at the bottom of funnel 331 opens to completely discharge the remaining impurities and some rainwater.

[0034] Example 2 This embodiment provides a method for treating pollutants in rainwater runoff using a multi-stage purification and filtration device, including the following steps: S1. Rainwater enters the water inlet chamber 5 through the annular filter 221 of the upper fixed cover 22, completing the initial interception of large particulate impurities; S2. Rainwater flows into the first chamber 51 through the inlet chamber 5, completes primary filtration through the upper filter box 23 and the lower filter box 24, and then enters the second chamber 52 through the connecting box 34. S3. Rainwater enters the third chamber 53 through the leak hole 332 of the funnel 331. The regulating seat 3 and the stabilizing seat 32 cooperate to regulate the water flow. The motor 41 of the rotating component 4 drives the rotating rod 42 to rotate. The purifying agent is added through the medicine tube 421 and the stirring rod 43 stirs and mixes to complete the purification of pollutants. S4. After purification, the rainwater enters the third chamber 53 and is eventually discharged through the drain outlet 21.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage purification and filtration device for rainwater runoff pollutants, comprising a fixed column (1), characterized in that: A water tank (2) is fixedly connected to the inner side of the fixed column (1). An upper fixed cover (22) is fixedly connected to the inner side of the upper end of the water tank (2). An annular filter screen (221) is fixedly connected to the top of the upper fixed cover (22). An upper filter box (23) is fixedly connected to the bottom of the upper fixed cover (22). Multiple square notches (231) are provided at the bottom of the upper filter box (23). A lower filter box (24) is detachably connected to the bottom of the upper filter box (23). An adjusting seat (3) for adjusting the direction of water flow is fixedly connected to the inner side of the upper filter box (23). A stabilizing seat (32) is detachably connected to the bottom of the adjusting seat (3). A second fixing ring (31) is fixedly connected to the top of the adjusting seat (3). A rotating assembly (4) is provided on the inner side of the adjusting seat (3) and the stabilizing seat (32). The upper filter box (23) and the lower filter box (24) achieve primary filtration of rainwater, while the adjustment seat (3) and the rotating component (4) work together to divert and discharge rainwater.

2. The multi-stage purification and filtration device for rainwater runoff pollutants according to claim 1, characterized in that: The top of the fixed column (1) is fixedly connected to a soft ring (11), which is fixedly connected to the upper outer wall of the water tank (2). The bottom of the fixed column (1) is fixedly connected to a fixed ring (12), and a drain outlet (21) is provided on one side of the lower end of the water tank (2).

3. The multi-stage purification and filtration device for rainwater runoff pollutants according to claim 1, characterized in that: The top of the lower filter box (24) is fixedly connected with an oblique protrusion (241). The size of the oblique protrusion (241) matches the size of the first square notch (231). The oblique protrusion (241) is detachably connected to the inside of the first square notch (231). The upper filter box (23) and the lower filter box (24) are interconnected.

4. The multi-stage purification and filtration device for rainwater runoff pollutants according to claim 1, characterized in that: A stabilizing ring (311) is fixedly connected between the bottom of the second fixed ring (31) and the adjusting seat (3). A plurality of first telescopic rods (312) are fixedly connected to the bottom of the stabilizing ring (311). The first telescopic rods (312) pass through the adjusting seat (3). A sliding ring (313) is fixedly connected to the bottom of the first telescopic rods (312). A plurality of baffles (314) are fixedly connected to the top of the sliding rings (313). The baffles (314) are respectively located between the plurality of first telescopic rods (312). A plurality of second square notches (315) are opened at the bottom of the adjusting seat (3). The sliding ring (313) is slidably connected in the second square notches (315). The position of the first square notch (231) matches the position of the second square notch (315).

5. A multi-stage purification and filtration device for rainwater runoff pollutants according to claim 4, characterized in that: The inner wall of the adjusting seat (3) is fixedly connected with a plurality of fixed sleeves (316), and the inner side of the fixed sleeves (316) is fixedly connected with a limiting ring (317). The outer wall of the limiting ring (317) is slidably connected with a plurality of sliding plates (318). The plurality of sliding plates (318) are respectively located inside the fixed sleeves (316). The interior of the adjusting seat (3) is electrically slidably connected with a buckle (319). The outer wall of the buckle (319) is in contact with the inner wall of the sliding plate (318), and the two are in the same position.

6. A multi-stage purification and filtration device for rainwater runoff pollutants according to claim 5, characterized in that: An adsorption plate (321) is fixedly connected to the inner wall of the stabilizing seat (32). A plurality of protruding plates (322) are fixedly connected to the top of the stabilizing seat (32). The position of the protruding plates (322) matches the position of the second square notch (315). A sandwich layer (323) is provided inside the stabilizing seat (32). The sliding ring (313) is slidably connected in the sandwich layer (323). A base plate (33) is fixedly connected to the bottom of the stabilizing seat (32). A funnel (331) is fixedly connected to the center of the base plate (33). A connecting box (34) is fixedly connected to the outer wall of the middle end of the funnel (331). A plurality of leakage holes (332) are provided on the outer wall of the part of the funnel (331) inside the connecting box (34). The connecting box (34) is connected to the lower filter box (24).

7. A multi-stage purification and filtration device for rainwater runoff pollutants according to claim 6, characterized in that: The rotating assembly (4) includes a sealing plate (411). A motor (41) is fixedly connected to the top of the sealing plate (411). A second telescopic rod (412) is fixedly connected to the bottom periphery of the sealing plate (411). A second fixing ring (31) is fixedly connected through the end of the second telescopic rod (412) away from the sealing plate (411). The output end of the motor (41) is fixedly connected to a rotating rod (42) through the sealing plate (411).

8. A multi-stage purification and filtration device for rainwater runoff pollutants according to claim 7, characterized in that: A medicine tube (421) is fixedly connected to the outer wall of the middle end of the rotating rod (42). A strainer (422) is provided on the outer side of the medicine tube (421). The strainer (422) is fixedly connected to the outer wall of the rotating rod (42). A stirring rod (43) is fixedly connected to the outer wall below the strainer (422). A third telescopic rod (44) is fixedly connected to the bottom of the stirring rod (43). A sealing plug (45) is fixedly connected to the bottom of the third telescopic rod (44).

9. A multi-stage purification and filtration device for rainwater runoff pollutants according to claim 8, characterized in that: The inner side of the fixed column (1) is also provided with a water inlet chamber (5), a first chamber (51), a second chamber (52), a third chamber (53) and a fourth chamber (54). The water inlet chamber (5), the first chamber (51), the second chamber (52), the third chamber (53) and the fourth chamber (54) are connected to each other in sequence. The water inlet chamber (5) is located in the inner space of the upper fixed cover (22). The first chamber (51) is located in the inner space of the lower filter box (24). The second chamber (52) is located in the inner space of the connecting box (34). The third chamber (53) is located in the space between the adjusting seat (3) and the stabilizing seat (32). The fourth chamber (54) is located in the inner space of the water tank (2).

10. A method for treating stormwater runoff pollutants through multi-stage purification and filtration, based on the stormwater runoff pollutant multi-stage purification and filtration device according to any one of claims 1-9, characterized in that, The methods and steps include the following: S1. Rainwater enters the water inlet chamber (5) through the annular filter (221) of the upper fixed cover (22), completing the initial interception of large particulate impurities; S2. Rainwater flows into the first chamber (51) through the inlet chamber (5), completes primary filtration through the upper filter box (23) and the lower filter box (24), and then enters the second chamber (52) through the connecting box (34). S3. Rainwater enters the third chamber (53) through the leak hole (332) of the funnel (331). The regulating seat (3) and the stabilizing seat (32) work together to regulate the water flow. The motor (41) of the rotating component (4) drives the rotating rod (42) to rotate. The purifying agent is added through the medicine tube (421), and the stirring rod (43) stirs and mixes to complete the purification of pollutants. S4. After purification, the rainwater enters the No. 3 chamber (53) and is eventually discharged through the drain outlet (21).

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