River water pollution treatment device

Abstract

The application relates to the technical field of river water pollution treatment, and discloses a river water pollution treatment device, which comprises a shell type flow guide mechanism and a driven type liquid medicine compression mechanism, and is internally provided with intercepting blades located in the inner pipeline shell and capable of rotating, a crankshaft located in the inner pipeline shell and capable of performing circular motion with the intercepting blades, and a piston plate located in the longitudinal connecting shell and capable of producing piston type liquid compression. The river water pollution treatment device is installed in the culvert of a river embankment, the rotation of the device is generated by the water flow impact of the river flow itself, the rotation can drive the mechanism to produce piston type reciprocating motion, the liquid medicine can be automatically added into the flowing river water along with the water flow, the uniformity during the mixing of the liquid medicine is improved, the treatment effect of the liquid medicine is improved, and the use cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of river water pollution control technology, specifically to a river water pollution control device. Background Technology

[0002] When organic matter in wastewater is decomposed by microorganisms, it consumes oxygen in the water, affecting the life of aquatic organisms. After the dissolved oxygen in the water is depleted, the organic matter undergoes anaerobic decomposition, producing foul-smelling gases such as hydrogen sulfide and mercaptans, which further deteriorates the water quality. Traditional treatment methods usually include physical cleaning, chemical treatment and bioremediation, but there are some problems in practical applications.

[0003] To address this issue, Chinese Patent Publication No. CN220811886U discloses a "Spraying Device for Water Pollution Control," whose main structure includes a mounting plate fixed to the bottom of a ship's stern, with a support plate fixed to the mounting plate; a spraying mechanism for spraying pesticide, comprising support plates fixed at intervals to the front end of the support plate, with a spraying pipe rotatably connected between the support plates; a pesticide storage cylinder in the middle of the spraying pipe; and an absorbent sponge filling the side of the spraying pipe away from the storage cylinder, with uniformly distributed discharge holes on its surface; and a driving mechanism mounted on the support plate for driving the rotation of the storage cylinder. This spraying device for water pollution control uses a relatively long spraying pipe, combined with an absorbent sponge, and utilizes the centrifugal force of high-speed rotation for spraying. It features a wide spraying range, long diameter, uniform spraying, and high working efficiency, effectively solving river water pollution problems and promoting ecological restoration and sustainable development.

[0004] In actual use, the aforementioned spraying device for water pollution control needs to be fixed to the stern of the boat. During operation, workers move the motorboat through the river. Therefore, additional energy is required when dispensing the pesticide solution, resulting in high operating costs. Furthermore, due to the flowing water in the river, the absorption of the pesticide solution by the deeper river water is very weak when using surface spraying for water pollution control, leading to uneven mixing of the solution and poor treatment effect. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a river water pollution treatment device installed in a culvert within a river embankment. The device utilizes the impact of the river's own water flow to generate rotation, which in turn drives a piston-like reciprocating motion. This allows the chemical solution to be autonomously added to the flowing river water, thereby improving the uniformity of the chemical solution mixture and enhancing the treatment effect, thus solving the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a river water pollution treatment device, comprising a culvert fixing frame that can be fixedly installed inside a culvert in a river embankment, and a shell-type flow guiding mechanism, which internally comprises an outer pipe shell fixedly installed at the center of the culvert fixing frame and capable of guiding river water, an inner pipe shell installed inside the outer pipe shell and having a hollow center, and a longitudinal connecting shell for connecting the outer pipe shell and the inner pipe shell and having a hollow interior; and a driven liquid compression mechanism, which internally comprises a flow-cutting blade located inside the outer pipe shell and capable of rotation, a crankshaft located in the inner pipe shell and capable of circular motion with the flow-cutting blade, and a piston plate located inside the longitudinal connecting shell and capable of piston-type liquid compression.

[0007] Preferably, the shell-type flow guiding mechanism includes a first river water flow chamber disposed inside the outer pipe shell. The outer pipe shell has a funnel-shaped flow guiding chamber at one end of the first river water flow chamber. A filter plate is fixedly installed at the open end of the funnel-shaped flow guiding chamber. An internal expansion chamber is disposed at the other end of the first river water flow chamber. A second river water flow chamber for discharging river water is disposed at one end of the internal expansion chamber. An inner pipe shell is disposed at the center of the internal expansion chamber, and movable components are disposed inside the inner pipe shell. The cavity, the movable cavity of the component, is provided with shaft mounting holes at both ends that connect to the internal expansion cavity. The longitudinal connecting shell, the outer pipe shell and the inner pipe shell are an integral structure. The interior of the longitudinal connecting shell is provided with a liquid compression chamber whose bottom end connects to the movable cavity of the component. The top of the liquid compression chamber is provided with a liquid limiting flow chamber. The top of the liquid limiting flow chamber is provided with a liquid suction channel that connects to the external space and is equipped with a liquid one-way valve. One side of the liquid limiting flow chamber is provided with a liquid discharge channel that connects to the external space and is equipped with a liquid one-way valve.

[0008] Preferably, the volume between the inner circumferential wall of the outer pipe shell and the outer circumferential wall of the inner pipe shell is not less than the volume of the No. 1 river water flow cavity.

[0009] Preferably, the diameter of the funnel-shaped flow guide cavity at the end near the first river water flow cavity is smaller than its diameter at the end near the filter plate.

[0010] Preferably, after installation, the river flows from the filter plate into the No. 2 river water flow chamber.

[0011] Preferably, the liquid check valve located inside the liquid discharge channel and the liquid inhalation channel can control the liquid to enter through the liquid inhalation channel and be discharged outward through the liquid discharge channel.

[0012] Preferably, the driven liquid compression mechanism includes two crankshafts with a first rotating shaft and a second rotating shaft respectively disposed at two horizontal ends. Parts of the first and second rotating shafts are mounted inside the two shaft mounting holes through bearings and sealing rings. Part of the second rotating shaft extends into the interior of the first river water flow chamber. A flow-cutting blade is fixedly mounted on the shaft located inside the first river water flow chamber. The transverse shaft of the crankshaft is mounted inside a bushing. A longitudinal movable rod is fixedly mounted on the outer circumferential side of the bushing. A rotating ball head is fixedly mounted at the top of the longitudinal movable rod. The piston plate can move longitudinally along the liquid compression chamber. The bottom of the piston plate is provided with a concave hemispherical mounting cavity. The rotating ball head is movably mounted inside the hemispherical mounting cavity.

[0013] Preferably, the structural radius of the hemispherical mounting cavity matches the structural radius of the rotating ball head, and the depth of the hemispherical mounting cavity is greater than the structural radius of the rotating ball head and less than the structural diameter of the rotating ball head.

[0014] Preferably, it also includes a buffered liquid discharge mechanism, which has a longitudinal pre-storage shell for storing liquid from the liquid discharge channel and a cylindrical elastic air membrane placed inside the longitudinal pre-storage shell for buffering the liquid.

[0015] Preferably, the buffered liquid discharge mechanism includes a liquid buffer chamber disposed inside the longitudinal pre-storage shell. The top of the longitudinal pre-storage shell is provided with a curved docking channel integrally formed with it and communicating with the top of the liquid buffer chamber. The curved docking channel and the liquid discharge channel are connected by a connecting hose. The bottom of the longitudinal pre-storage shell is provided with an annular discharge shell integrally formed with it and fixedly installed at the tail end of the outer pipe shell. The interior of the annular discharge shell is provided with a third river water flow chamber communicating with the second river water flow chamber. The bottom end of the third river water flow chamber and the liquid buffer chamber are connected by a liquid flow hole. A liquid nozzle is installed inside the liquid flow hole. A cylindrical elastic air film with its bottom end communicating with the top end of the liquid flow hole and its top end communicating with the bottom port of the curved docking channel is embedded inside the liquid buffer chamber.

[0016] Compared with the prior art, the present invention provides a river water pollution treatment device, which has the following beneficial effects:

[0017] Installed in the culvert of a river embankment, the device rotates by the impact of the river's own water flow. This rotation drives the mechanism to produce a piston-like reciprocating motion, allowing the chemical solution to be added autonomously into the flowing river water. This improves the uniformity of the chemical solution during mixing, thereby enhancing the treatment effect and reducing operating costs. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0020] Figure 3 This is a perspective view of the shell-type flow guiding mechanism in this invention;

[0021] Figure 4 This is a three-dimensional cross-sectional view of the shell-type flow guiding mechanism in this invention;

[0022] Figure 5 This is a perspective view of the driven liquid compression mechanism in this invention;

[0023] Figure 6 This is a three-dimensional cross-sectional view of the driven liquid compression mechanism in this invention;

[0024] Figure 7 This is a perspective view of the buffered liquid discharge mechanism in this invention;

[0025] Figure 8 This is a three-dimensional cross-sectional view of the buffered liquid discharge mechanism in this invention.

[0026] The components include: 1. Culvert fixing frame; 2. Shell-type flow guiding mechanism; 21. Outer pipe shell; 22. No. 1 river water flow chamber; 23. Horn-shaped flow guiding chamber; 24. Filter plate; 25. Internal expansion chamber; 26. No. 2 river water flow chamber; 27. Inner pipe shell; 28. Longitudinal connecting shell; 29. ​​Component movable chamber; 210. Shaft mounting hole; 211. Liquid compression chamber; 212. Liquid limiting flow chamber; 213. Liquid discharge channel; 214. Liquid suction channel; 3. Driven liquid compression mechanism. 31. Crankshaft; 32. Rotating Shaft No. 1; 33. Rotating Shaft No. 2; 34. Cut-off Blade; 35. Shaft Sleeve; 36. Longitudinal Moving Rod; 37. Rotating Ball Head; 38. Piston Plate; 39. Hemispherical Mounting Cavity; 4. Buffer-type Liquid Discharge Mechanism; 41. Annular Discharge Housing; 42. No. 3 River Water Flow Cavity; 43. Longitudinal Pre-storage Housing; 44. Liquid Buffer Chamber; 45. Liquid Flow Hole; 46. Curved Connecting Channel; 47. Connecting Hose; 48. Cylindrical Elastic Air Film; 49. Liquid Nozzle. Detailed Implementation

[0027] The technical solutions of 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.

[0028] Please see Figure 1 and Figure 2 A river water pollution treatment device includes a culvert fixing frame 1 that can be fixedly installed inside a culvert in a river embankment. The outer annular surface of the culvert fixing frame 1 is fixedly installed inside the culvert in the river embankment, and then a chemical liquid suction channel 214 is connected to the discharge port of a storage tank containing chemical liquid through a pipe.

[0029] To achieve targeted flow of river water and medicinal liquid, please refer to [link / reference needed]. Figure 1 , Figure 2 , Figure 3 and Figure 4 A shell-type flow guiding mechanism 2 needs to be set up. Inside, there is an outer pipe shell 21 fixedly installed at the center of the culvert fixing frame 1 and capable of guiding the river water, an inner pipe shell 27 installed inside the outer pipe shell 21 and hollow in the center, and a longitudinal connecting shell 28 for connecting the outer pipe shell 21 and the inner pipe shell 27 and hollow inside. The river water enters the outer pipe shell 21 through the funnel-shaped flow guiding cavity 23 and is filtered by the filter plate 24 to prevent solid impurities from entering. The river water entering the outer pipe shell 21 will be discharged outward in sequence through the first river water flow cavity 22, the gap space of the internal expansion cavity 25, and the second river water flow cavity 26. At the same time, the medicine will be drawn into the medicine compression cavity 211 through the medicine suction channel 214. After compression, it will be discharged outward through the medicine discharge channel 213, thereby realizing the directional flow of the river water and the medicine.

[0030] For details regarding the specific structure of the shell-type flow guiding mechanism 2, please refer to [link / reference]. Figure 3 and Figure 4The system includes a first river water flow chamber 22 located inside the outer pipe shell 21. The outer pipe shell 21 has a funnel-shaped guide chamber 23 at one end of the first river water flow chamber 22. A filter plate 24 is fixedly installed at the open end of the funnel-shaped guide chamber 23. An internal expansion chamber 25 is located at the other end of the first river water flow chamber 22. A second river water flow chamber 26 for discharging river water is located at one end of the internal expansion chamber 25. An inner pipe shell 27 is located at the center of the internal expansion chamber 25. A component movable chamber 29 is located inside the inner pipe shell 27. Both ends of the component movable chamber 29 have shaft mounting holes 210 connecting to the internal expansion chamber 25. The longitudinal connecting shell 28, the outer pipe shell 21, and the inner pipe shell 27 are an integral structure. The longitudinal connecting shell 28 has a liquid compression device at its bottom end connecting to the component movable chamber 29. The liquid compression chamber 211 has a liquid limiting flow chamber 212 at its top. The liquid limiting flow chamber 212 has a liquid suction channel 214 at its top, which is connected to the external space and has a liquid one-way valve installed inside. The liquid limiting flow chamber 212 has a liquid discharge channel 213 on one side, which is connected to the external space and has a liquid one-way valve installed inside. The volume between the inner circumference of the outer pipe shell 21 and the outer circumference of the inner pipe shell 27 is not less than the volume of the first river water flow chamber 22. The diameter of the funnel-shaped guide chamber 23 at the end near the first river water flow chamber 22 is smaller than its diameter at the end near the filter plate 24. After installation, the river flows from the filter plate 24 to the second river water flow chamber 26. The liquid one-way valves located inside the liquid discharge channel 213 and the liquid suction channel 214 can control the liquid to enter through the liquid suction channel 214 and be discharged outward through the liquid discharge channel 213.

[0031] To implement the passive drug mixing function, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 5 and Figure 6 A driven liquid compression mechanism 3 needs to be set up. It has a throttling blade 34 located inside the outer pipe housing 21 and capable of rotation, a crankshaft 31 located in the inner pipe housing 27 and capable of circular motion with the throttling blade 34, and a piston plate 38 located inside the longitudinal connecting housing 28 and capable of piston-type liquid compression. The flowing river water will impact the throttling blade 34, thereby causing the throttling blade 34 to drive the crankshaft 31 to rotate. When the crankshaft 31 rotates, it will drive the piston plate 38 to reciprocate inside the liquid compression chamber 211 through the longitudinal moving rod 36. With the cooperation of the liquid one-way valve, the liquid is autonomously mixed in by utilizing the kinetic energy of the flowing river water.

[0032] For details regarding the structure of the driven liquid compression mechanism 3, please refer to [link / reference]. Figure 5and Figure 6 The crankshaft 31 includes a first rotating shaft 32 and a second rotating shaft 33 respectively located at two horizontal ends. Parts of the first rotating shaft 32 and the second rotating shaft 33 are mounted inside two shaft mounting holes 210 via bearings and sealing rings. Part of the second rotating shaft 33 extends into the first river water flow cavity 22. A flow-cutting blade 34 is fixedly mounted on the second rotating shaft 33 located inside the first river water flow cavity 22. The transverse shaft of the crankshaft 31 is mounted inside a bushing 35. The outer circumference of the bushing 35... A longitudinal movable rod 36 is fixedly installed on the side, and a rotating ball head 37 is fixedly installed at the top of the longitudinal movable rod 36. The piston plate 38 can move longitudinally along the liquid compression chamber 211. The bottom of the piston plate 38 is provided with a concave hemispherical mounting cavity 39. The rotating ball head 37 is movably installed inside the hemispherical mounting cavity 39. The structural radius of the hemispherical mounting cavity 39 matches the structural radius of the rotating ball head 37, and the depth of the hemispherical mounting cavity 39 is greater than the structural radius of the rotating ball head 37 and less than the structural diameter of the rotating ball head 37.

[0033] To implement buffered injection of the drug solution, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 7 and Figure 8 A buffered liquid discharge mechanism 4 needs to be set up. The mechanism has a longitudinal pre-storage shell 43 for storing the liquid from the liquid discharge channel 213 and a cylindrical elastic gas membrane 48 placed inside the longitudinal pre-storage shell 43 for buffering the liquid. The liquid from the liquid discharge channel 213 will first enter the liquid buffer chamber 44. When the liquid pressure is too high, the cylindrical elastic gas membrane 48 will expand outward to achieve buffered storage of the liquid. At the same time, the liquid will be sprayed into the river water flowing into the No. 3 river water flow chamber 42 through the liquid nozzle 49, thereby mixing with the river water.

[0034] For details regarding the specific structure of the buffered liquid discharge mechanism 4, please refer to [link / reference needed]. Figure 7 and Figure 8The system includes a liquid buffer chamber 44 disposed inside a longitudinal pre-storage housing 43. The top of the longitudinal pre-storage housing 43 is provided with a curved docking channel 46 integrally formed with it and connected to the top of the liquid buffer chamber 44. The curved docking channel 46 and the liquid discharge channel 213 are connected by a connecting hose 47. The bottom of the longitudinal pre-storage housing 43 is provided with an annular drainage housing 41 integrally formed with it and fixedly installed at the tail end of the outer pipe housing 21. The interior of the annular drainage housing 41 is provided with a third river water flow chamber 42 connected to the second river water flow chamber 26. The third river water flow chamber 42 and the bottom end of the liquid buffer chamber 44 are connected by a liquid flow hole 45. A liquid nozzle 49 is installed inside the liquid flow hole 45. A cylindrical elastic air film 48 is embedded inside the liquid buffer chamber 44, with its bottom end connected to the top end of the liquid flow hole 45 and its top end connected to the bottom port of the curved docking channel 46.

[0035] In use, the outer annular surface of the culvert fixing frame 1 is fixedly installed inside the culvert of the river embankment. Then, a pipe connects the liquid inhalation channel 214 to the discharge port of a storage tank containing the liquid. River water enters the outer pipe shell 21 through the funnel-shaped guide cavity 23 and is filtered by the filter plate 24 to prevent solid debris from entering. The river water entering the outer pipe shell 21 will sequentially pass through the gap space of the first river water flow cavity 22, the internal expansion cavity 25, and the second river water flow cavity 26 before being discharged outward. During the flow of the river water, the flowing river water will impact the intercepting blade 34, thereby causing the intercepting blade 34 to... The crankshaft 31 is driven to rotate. When the crankshaft 31 rotates, it will drive the piston plate 38 to reciprocate inside the liquid compression chamber 211 through the longitudinal moving rod 36. The liquid will be drawn into the liquid compression chamber 211 through the liquid intake channel 214. After compression, it will be discharged outward through the liquid discharge channel 213. The liquid from the liquid discharge channel 213 will first enter the liquid buffer chamber 44. When the liquid pressure is too high, the cylindrical elastic gas film 48 will expand outward, thereby achieving buffered storage of the liquid. At the same time, the liquid will be sprayed into the river water flowing into the No. 3 river water flow chamber 42 through the liquid nozzle 49, thereby mixing with the river water.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A river water pollution treatment device, comprising a culvert fixing frame (1) capable of being fixedly installed inside a culvert on a river embankment, characterized in that: It also includes, The shell-type flow guiding mechanism (2) has an outer pipe shell (21) fixedly installed in the center of the culvert fixing frame (1) and capable of guiding the river water, an inner pipe shell (27) installed inside the outer pipe shell (21) and hollow in the center, and a longitudinal connecting shell (28) used to connect the outer pipe shell (21) and the inner pipe shell (27) and hollow inside. And a driven liquid compression mechanism (3), which is provided with a throttling blade (34) located inside the outer pipe housing (21) and capable of rotation, a crankshaft (31) located in the inner pipe housing (27) and capable of circular motion with the throttling blade (34), and a piston plate (38) located inside the longitudinal connecting housing (28) and capable of piston-type liquid compression. The shell-type flow guiding mechanism (2) includes a first river water flow chamber (22) disposed inside the outer pipe shell (21). The outer pipe shell (21) has a funnel-shaped flow guiding chamber (23) at one end of the first river water flow chamber (22). A filter plate (24) is fixedly installed at the open end of the funnel-shaped flow guiding chamber (23) of the outer pipe shell (21). An internal expansion chamber (25) is disposed at the other end of the first river water flow chamber (22). A second river water flow chamber (26) for discharging river water is disposed at one end of the internal expansion chamber (25). An inner pipe shell (27) is disposed at the center of the inner expansion chamber (25) of the outer pipe shell (21). A component movement chamber (29) is disposed inside the inner pipe shell (27). The two ends of the movable cavity (29) of the component are provided with shaft mounting holes (210) that connect to the internal expansion cavity (25). The longitudinal connecting shell (28), the outer pipe shell (21) and the inner pipe shell (27) are an integral structure. The interior of the longitudinal connecting shell (28) is provided with a liquid compression chamber (211) whose bottom end connects to the movable cavity (29). The top of the liquid compression chamber (211) is provided with a liquid limiting flow chamber (212). The top of the liquid limiting flow chamber (212) is provided with a liquid suction channel (214) that connects to the external space and is equipped with a liquid one-way valve. The side of the liquid limiting flow chamber (212) is provided with a liquid discharge channel (213) that connects to the external space and is equipped with a liquid one-way valve. The driven liquid compression mechanism (3) includes two crankshafts (31) with a first rotating shaft (32) and a second rotating shaft (33) respectively arranged at their horizontal ends. Parts of the shafts of the first rotating shaft (32) and the second rotating shaft (33) are installed inside the two shaft mounting holes (210) through bearings and sealing rings. Part of the shaft of the second rotating shaft (33) extends into the interior of the first river water flow chamber (22). The second rotating shaft (33) is fixedly mounted on the shaft located inside the first river water flow chamber (22). The flow cut-off blade (34) is installed inside a bushing (35) with the transverse shaft of the crankshaft (31) fixedly mounted on the outer circumferential side of the bushing (35). A longitudinal movable rod (36) is fixedly mounted on the top of the longitudinal movable rod (36). A rotating ball head (37) is fixedly mounted on the top of the longitudinal movable rod (36). The piston plate (38) can move longitudinally along the liquid compression chamber (211). The bottom of the piston plate (38) is provided with a concave hemispherical mounting cavity (39). The rotating ball head (37) is movably mounted inside the hemispherical mounting cavity (39).

2. The river water pollution treatment device according to claim 1, characterized in that: The volume between the inner circumference of the outer pipe shell (21) and the outer circumference of the inner pipe shell (27) is not less than the volume of the No. 1 river water flow cavity (22).

3. The river water pollution treatment device according to claim 2, characterized in that: The diameter of the funnel-shaped flow guide cavity (23) at the end near the first river water flow cavity (22) is smaller than its diameter at the end near the filter plate (24).

4. The river water pollution treatment device according to claim 3, characterized in that: After installation, the river flows from the filter plate (24) to the second river water flow chamber (26).

5. A river water pollution treatment device according to claim 4, characterized in that: The liquid check valve located inside the liquid discharge channel (213) and the liquid intake channel (214) can control the liquid to enter through the liquid intake channel (214) and be discharged outward through the liquid discharge channel (213).

6. A river water pollution treatment device according to claim 5, characterized in that: The structural radius of the hemispherical mounting cavity (39) matches the structural radius of the rotating ball head (37), and the depth of the hemispherical mounting cavity (39) is greater than the structural radius of the rotating ball head (37) and less than the structural diameter of the rotating ball head (37).

7. A river water pollution treatment device according to claim 6, characterized in that: It also includes a buffered liquid discharge mechanism (4), which has a longitudinal pre-storage shell (43) for storing liquid from the liquid discharge channel (213) and a cylindrical elastic air membrane (48) placed inside the longitudinal pre-storage shell (43) for buffering the liquid.

8. A river water pollution treatment device according to claim 7, characterized in that: The buffered liquid discharge mechanism (4) includes a liquid buffer chamber (44) disposed inside the longitudinal pre-storage housing (43). The top of the longitudinal pre-storage housing (43) is provided with a curved docking channel (46) integral with it and communicating with the top of the liquid buffer chamber (44). The curved docking channel (46) and the liquid discharge channel (213) are connected by a connecting hose (47). The bottom of the longitudinal pre-storage housing (43) is provided with an annular discharge housing integral with it and fixedly installed at the tail end of the outer pipe housing (21). (41) The annular drain housing (41) is provided with a third river water flow chamber (42) that connects to the second river water flow chamber (26). The bottom end of the third river water flow chamber (42) and the medicine buffer chamber (44) are connected by a medicine flow hole (45). A medicine nozzle (49) is installed inside the medicine flow hole (45). A cylindrical elastic gas film (48) with its bottom end connected to the top end of the medicine flow hole (45) and its top end connected to the bottom port of the curved docking channel (46) is embedded inside the medicine buffer chamber (44).

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