Aeration mechanism for sewage treatment

Abstract

The utility model discloses an aeration mechanism for sewage treatment, which comprises a longitudinally arranged aeration main pipe, and at least three groups of horizontally extending aeration branch pipes are distributed on the outer wall of the aeration main pipe along the axial direction at equal intervals; aeration holes which are distributed at equal intervals are formed in the bottom surface of the aeration branch pipe, and the tail end of the aeration branch pipe extends below the mounting position of the movable flow baffle; each flow baffle is transversely bridged between two adjacent aeration branch pipes, and the bottom edge of each flow baffle is matched with the outer diameter curved surface of the corresponding aeration branch pipe. When airflow is released from the aeration holes, the curved surfaces of the flow baffles guide bubbles to rise along a specific track, the bubble column concentration phenomenon formed by traditional vertical aeration is avoided, and the activity of a biological membrane in the edge area of the reactor is improved.

Description

Technical Field

[0001] This utility model relates to an aeration mechanism, and more particularly to an aeration mechanism for sewage treatment. Background Technology

[0002] With the acceleration of urbanization and industrial development, the demand for wastewater treatment is increasing daily. Traditional wastewater treatment methods face problems such as low treatment efficiency and high energy consumption. Therefore, technological innovation, especially the optimization of aeration systems, is particularly important. Optimized aeration systems can enhance biofilm formation and activity, improving wastewater removal efficiency, especially the removal rate of pollutants such as nitrogen and phosphorus. Furthermore, optimized aeration not only reduces energy consumption and improves system economics but also extends reactor lifespan and reduces maintenance costs.

[0003] MBBR technology has been widely used in the wastewater treatment industry both domestically and internationally in recent years. With its excellent treatment efficiency and good adaptability, it has gradually become the mainstream choice for small and medium-sized wastewater treatment. Compared with the traditional activated sludge process, MBBR improves wastewater treatment efficiency and reduces sludge production through the formation and growth of a biofilm. In China, many wastewater treatment plants have begun to adopt the MBBR process; however, the design and operation of the aeration system often fail to reach optimal levels, affecting the overall treatment effect.

[0004] For example, the patent document "An Aeration Tank for Wastewater Treatment" published in Chinese patent literature, publication number "CN108862573A", includes a tank body. A fixed frame is fixedly connected to the top of the tank body. A rotary motor is fixedly connected to the lower surface of the fixed frame. A main rotating shaft is fixedly connected to the shaft extension end of the rotary motor. The lower end of the main rotating shaft extends into the tank body. Aeration pipes are fixedly connected to the left and right sides of the main rotating shaft. The main rotating shaft is hollow inside. The aeration pipes are connected to the main rotating shaft. Aeration plates are respectively provided on the left and right sides of the main rotating shaft. The aeration plates are hollow inside. The aeration plates are hinged to the aeration pipes and are connected to the aeration pipes. A slider is slidably connected to the lower surface of the aeration plates. A dual-shaft motor is fixedly connected to the middle of the main rotating shaft. Turntables are fixedly connected to the two shaft extension ends of the dual-shaft motor. A fixed rod is fixedly connected to the side wall of the turntable near the edge. A connecting rod is sleeved on the fixed rod. The connecting rod is rotatably connected to the fixed rod. The top end of the connecting rod is hinged to the slider through a ball hinge. A spiral plate is provided below the aeration pipe.

[0005] The above-mentioned scheme has good aeration effect and high sewage treatment efficiency, but the treatment process in this method has significant limitations and cannot solve problems such as oxygen supply attenuation in the extended area of ​​the aeration system. Utility Model Content

[0006] To address the problem of oxygen supply attenuation in the extended area of ​​the tank in existing aeration systems, this invention solves the problem of insufficient oxygen supply at the far end of traditional aeration systems by axially distributing branch pipes along the longitudinal main pipe and setting aeration holes with decreasing aperture gradients. It also achieves efficient solid-liquid separation while reducing airflow pressure loss, thereby obtaining the triple technical effects of improved oxygen transfer efficiency, extended maintenance cycle, and significantly reduced energy consumption.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An aeration mechanism for wastewater treatment includes: a longitudinally arranged aeration main pipe, the outer wall of which is equidistantly distributed with at least three sets of horizontally extending aeration branch pipes; aeration holes are opened at equal intervals on the bottom surface of the aeration branch pipes, and the ends extend to below the installation position of a movable baffle plate; the baffle plate is transversely connected between two adjacent aeration branch pipes, and its bottom edge matches the outer diameter curved surface of the aeration branch pipe.

[0009] In this design, the longitudinally positioned aeration main pipe forms a three-dimensional aeration network through axially equidistant aeration branch pipes. Aeration holes are equidistantly spaced on the bottom surface of the horizontally extending branch pipes, forming a linear air curtain. The ends of the aeration branch pipes extend below the baffle mounting position. Combined with the geometric matching relationship between the bottom of the baffle and the outer diameter curved surface of the branch pipe, a directional airflow constraint structure is formed. When airflow is released from the aeration holes, the curved surface of the baffle guides the bubbles to rise along a specific trajectory, avoiding the bubble column concentration phenomenon formed by traditional vertical aeration.

[0010] The aeration holes are distributed with a decreasing aperture gradient along the extension direction of the branch pipe, and the decrease is positively correlated with the distance from the end of the branch pipe to the main pipe. This solves the problem of insufficient oxygen supply at the far end of traditional aeration systems.

[0011] The flow-facing surface of the baffle is provided with staggered flow-guiding units, including protrusions at an angle of 10-30° to the plate surface and adjustment through holes penetrating the plate body.

[0012] It further includes multiple sets of intercepting screens, the bottom of which is connected to the top surface of the aeration branch pipe by a dovetail groove;

[0013] The intercepting screen has a geometric through-hole array, which includes a vertical frame portion and a horizontal connecting portion. The through-holes in the vertical frame portion are equilateral polygons, and the through-holes in the horizontal connecting portion are rectangles with an aspect ratio of 1:2 to 1:3.

[0014] The aeration branch pipe is provided with a variable diameter section at its end, which includes a guide fan that gradually expands in the horizontal direction and a compression section that extends towards the bottom of the pool.

[0015] The inner wall of the compression section is provided with a spiral guide groove, and the spiral angle increases by 5°-15° from the connecting end to the free end.

[0016] The regulating through hole is embedded with a rotatable guide vane, and the edge of the guide vane has limiting teeth that mesh with the annular tooth groove on the inner wall of the through hole.

[0017] Therefore, this utility model has the following beneficial effects:

[0018] By utilizing the decreasing aperture structure at the end of the branch pipe combined with the curved profile of the baffle plate, an airflow distribution from dense to sparse is formed, which allows bubbles to be released evenly in the extension direction of the branch pipe, overcoming the problem of oxygen supply attenuation at the end of traditional aeration devices and improving the activity of biofilm in the edge area of ​​the reactor.

[0019] The guide vanes adjust their angle through toothed meshing, creating vortices in conjunction with the through-holes in the plate. This turbulence accelerates the shedding of metabolites from the biofilm surface, promotes efficient contact between microorganisms and pollutants, and maintains the biofilm's continuous metabolic capacity.

[0020] The combination of polygonal through holes and rectangular connecting parts effectively enhances the strength of the screen structure and prevents deformation caused by water flow impact.

[0021] The gradually expanding fan-shaped surface guides the airflow to diffuse smoothly, reducing local pressure loss; the spiral guide groove forces the bubbles to rotate and rise, prolonging the gas-liquid contact time, synergistically improving the uniformity of dissolved oxygen distribution and reducing the unit energy consumption of the aeration system. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a sewage treatment pond.

[0023] Figure 2 yes Figure 1 Cross-sectional view at point AA.

[0024] Figure 3 yes Figure 1 Cross-sectional view at point BB.

[0025] In the diagram: 100, tank body; 102, inlet well; 103, thickener; 104, pre-anoxic tank; 105, anaerobic tank; 106, aerobic tank; 107, third-stage anoxic tank; 108, SBR tank; 1, main aeration pipe; 2, branch aeration pipe; 21, aeration hole; 3, baffle plate; 31, flow guiding unit; 311, protrusion; 312, regulating through hole; 313, flow guide plate; 4, intercepting screen; 41, dovetail groove; 22, diameter changing section; 221, flow guiding fan; 222, compression section. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] like Figure 1As shown, the wastewater treatment system in this embodiment employs a multi-stage biological treatment process. The treatment flow in tank 100 sequentially includes an inlet well 102, a thickening tank 103, a pre-anoxic tank 104, an anaerobic tank 105, a three-stage series anoxic tank, and a symmetrically arranged aerobic tank unit on both sides. The aerobic tank 106 serves as the core area for the biofilm reaction. Its tank body is constructed of reinforced concrete, with an effective water depth controlled between 4.5 and 6 meters, and a length-to-width ratio set at 3:1 to optimize fluid dynamics. An inverted conical sludge hopper is installed at the bottom of the tank, and flow guide baffles are installed on the side walls to form a circulation channel. Two sets of aeration mechanisms are arranged parallel to each other along the length of the tank, located at 1 / 5 of the tank width from the side walls. The axis of the aeration branch pipe 2 forms a 75° angle with the water flow direction, creating an interlaced air curtain.

[0029] The inlet of the aerobic tank is connected to the third-stage anoxic tank 107 via an adjustable weir gate, and the outlet is connected to the SBR tank 108 via an overflow channel. The tanks are filled with high-density polyethylene biofilm carriers, with a carrier filling rate controlled between 35% and 40%, maintaining suspension through the fluid dynamics generated by the aeration system. The main aeration pipe 1 is longitudinally arranged in the central trench at the bottom of the tank and fixed to a concrete base by a bracket, with its axis coinciding with the centerline of the tank. The horizontal extension sections of the branch pipes have a variable diameter structure, with the cross-sectional area near the main pipe accounting for 60%-65% of the total cross-sectional area of ​​the branch pipe, and the ratio of the length of the tapered section at the end to the total length of the branch pipe controlled within the range of 1:4-1:5.

[0030] like Figure 2 As shown in Figure 3, the aeration holes 21 are arranged in a linear array along the bottom surface of the branch pipe. The hole spacing is dynamically adjusted according to the fluidization requirements of the carrier, and the hole spacing near the main pipe end is 1.2-1.5 times that of the end area. The baffle plate 3 is installed at a height of 1.2-1.8 meters from the bottom of the pool, and the ratio of the plate length to the distance between adjacent branch pipes is 0.7-0.8, forming a continuous guide surface. The intercepting screen 4 is installed vertically 0.3-0.5 meters above the aeration branch pipe 2. The long axis of its through-hole array is consistent with the direction of water flow, and the depth of the dovetail groove 41 at the bottom of the screen is 1 / 8-1 / 6 of the diameter of the branch pipe. The expansion angle of the guide fan 221 of the variable diameter section 22 is segmented according to the pool width. For every 0.5 meters increase in pool width, the fan angle increases by 3°-5° to ensure uniform airflow coverage.

[0031] In this embodiment, by precisely controlling the matching relationship between aeration intensity and hydrodynamic conditions, a stable swirling motion is formed on the biofilm carrier within the aerobic tank. The biofilm thickness formed on the carrier surface is maintained within the optimal range of 1.0-2.0 mm by the shear force generated by the baffle plate 3, and the distribution of microbial communities within the biofilm exhibits a gradient structure of aerobic bacteria in the outer layer and facultative bacteria in the inner layer. The synergistic effect of the aeration mechanism and the tank structure ensures that the longitudinal gradient difference of dissolved oxygen concentration is controlled within 0.3 mg / L, and the lateral distribution uniformity coefficient reaches above 0.92, creating favorable conditions for subsequent deep treatment in the SBR tank.

[0032] Specifically, the longitudinally arranged aeration main pipe 1 is centrally located along the long axis of the reaction tank, employing a uniform wall thickness circular pipe structure. Multiple sets of horizontally extending aeration branch pipes 2 are fixed to its outer surface via radial connectors. The branch pipe axis spacing is evenly distributed according to the effective length of the tank. Aeration holes 21 are linearly and evenly distributed on the bottom surface of each branch pipe, with the hole arrangement direction parallel to the branch pipe extension axis. The extension section at the end of the branch pipe extends beyond the outermost aeration hole 21 by a certain length, and the outer surface of the extension is machined with a continuous curved surface, forming a geometric matching relationship with the bottom contour of the baffle plate 3. The baffle plate 3 adopts a flat plate structure that laterally spans adjacent branch pipes. An array of protruding units is set on the flow-facing surface of the plate, with a through hole behind each protrusion. A rotatable guide vane 313 with a limiting structure is installed inside the hole, and angle adjustment is achieved through mechanical engagement.

[0033] The intercepting screen 4 adopts a regular geometric through-hole array structure. The vertical frame and horizontal connecting part form a composite pore structure. The bottom of the screen is machined with a specific contoured fitting groove, forming a quick connection mechanism with the guide structure at the top of the branch pipe. The aeration branch pipe 2 is equipped with a gradually expanding variable diameter section 22 at its end, and its outer surface forms a fan-shaped guide surface. The end is connected to a downwardly extending compression section 222, the inner wall of which is machined with a continuously changing spiral guide structure. When the system is running, compressed air is distributed to each branch pipe through the main pipe. The airflow forms a diffusion flow under the action of the variable diameter section 22. Some gas is released through the aeration holes 21 to generate a bubble group, and the other part forms a rotating upward airflow along the compression section 222. The bottom curved surface of the baffle plate 3 guides the vertically floating bubbles to both sides, forming an interaction with the bubble flow generated by the adjacent branch pipe below the plate. The adjustable guide vane changes the deflection angle according to the fluid dynamics conditions, generating a specific vortex shape behind the plate through the through-hole jet. The intercepting screen 4 achieves solid-liquid separation through the composite pore structure, and the fitting connection mechanism generates adaptive adjustment when the pressure difference changes.

[0034] The main aeration pipe 1 and the branch pipes are connected by flanges, with sealing gaskets at the connection surfaces to prevent gas leakage. The equidistant spacing of the branch pipes along the axial direction follows the boundary layer theory in fluid mechanics, ensuring that the bubble curtain generated by adjacent branch pipes forms a continuous coverage during its ascent. The diameter variation of the aeration holes 21 along the extension direction of the branch pipes follows the fluid pressure decay law, with a larger diameter near the main pipe end to match the higher air pressure. As the air pressure gradually decreases with the extension of the branch pipes, the corresponding hole diameter is reduced proportionally. This gradient scheme effectively balances the air supply in different sections of the branch pipes, preventing a decrease in aeration efficiency due to insufficient pressure at the far end. The curved profile of the extended section at the end of the branch pipe forms a geometric coupling with the bottom of the baffle 3. The gap between the two is controlled using a non-contact sealing principle, which guides the direction of bubble movement and prevents solid particles from depositing and clogging the pipes.

[0035] The baffle plate 3 is made of corrosion-resistant metal sheet, and its transverse cross-connection structure gives it both guiding and supporting functions. The baffle plate's frontal surface is equipped with staggered guiding units 31, including protrusions 311 at an angle of 10-30° to the plate surface and adjusting through holes 312 penetrating the plate. The angle of the protrusions 311 on the frontal surface is based on fluid impact angle optimization theory, which can generate a stable vortex separation effect under different flow velocity conditions. The diameter of the through hole has a functional relationship with the rotation angle of the guide vane. When the guide vane is in different deflection positions, the effective flow area of ​​the hole changes accordingly, thereby achieving the function of dynamically adjusting the fluid throughput. The meshing structure between the limiting teeth on the edge of the guide vane and the tooth grooves on the hole wall is an involute tooth shape, ensuring positioning accuracy and impact resistance during angle adjustment.

[0036] The geometric perforation array of the intercepting screen 4 adopts a fractal structure, with the regular polygonal holes in the vertical frame and the rectangular holes in the horizontal connection complementing each other in terms of mechanical properties. The polygonal holes improve structural strength by dispersing stress at the corners when subjected to water flow impact, while the rectangular holes enhance the overall rigidity of the screen through their oriented arrangement along the long sides. The fit between the bottom fitting groove and the top guide rail of the branch pipe adopts a self-centering principle. During installation, geometric constraints automatically correct positional deviations, ensuring that the screen plane remains perpendicular to the water flow direction. This connection method allows for quick assembly and disassembly while adapting to material deformation caused by temperature changes, preventing structural failure due to thermal expansion.

[0037] The gradually expanding structure of the variable diameter section 22 follows the fluid continuity equation, achieving a smooth transition in airflow velocity through changes in cross-sectional area. The expansion angle of the fan-shaped guide surface maintains a proportional relationship with the width-to-depth ratio of the tank, ensuring that the airflow coverage matches the geometry of the reaction tank. The spiral guide structure of the compression section 222 adopts a variable pitch design, with a small rise angle at the beginning to maintain airflow stability. As the height increases, the rise angle gradually increases, inducing an increase in the rotational speed of the induced bubbles, which can prolong the gas-liquid contact time and promote the breakup and refinement of the bubble group, thereby improving oxygen transfer efficiency.

[0038] During system operation, when compressed air enters the main aeration pipe 1, it is distributed axially to each aeration unit along the branch pipes. Under the action of the guide surface of the variable diameter section 22, part of the airflow forms a vertically rising bubble group through the aeration holes 21, while the other part enters the compression section 222 to form a rotating airflow. The curved structure at the bottom of the baffle plate 3 guides the vertical bubbles to the two sides, where they converge with the bubble curtain generated by the adjacent branch pipes below the plate. This interaction promotes the reduction of bubble size and uniform dispersion. The adjustable guide vane automatically adjusts its deflection angle according to the real-time monitored water flow velocity. When the flow velocity exceeds the set threshold, the guide vane rotates to the maximum tilt angle, generating a periodic vortex behind the plate, enhancing the shearing effect on the biofilm surface.

[0039] The intercepting screen 4 achieves graded filtration through a composite pore structure. Larger suspended solids are trapped by the polygonal pores, while fine particles settle due to velocity changes as they pass through the rectangular pores. The interlocking connection mechanism achieves self-cleaning by elastically adjusting the fitting gap when the pressure difference across the screen increases. The spiral guide groove of the variable diameter section 22 causes the residual airflow to swirl, and the bubbles rotate under the Coriolis force during their ascent. This motion prolongs the gas-liquid contact time and promotes the radial diffusion of dissolved oxygen.

[0040] Regarding the dynamic adjustment mechanism, when the influent pollutant load changes, the control system adjusts the main gas supply parameters in real time via pressure sensors. Under high load conditions, the gas volume at the end of the branch pipe is increased, utilizing the aperture gradient distribution to compensate for the attenuation of oxygen transfer at the far end; under low load conditions, the gas volume at the near end is reduced, and the flow guides the bubbles to the central region of the pool with the help of the baffle plate 3. The angle of the guide vanes is automatically adjusted according to seasonal water temperature changes; under low temperature conditions, the inclination angle is increased to enhance fluid mixing, while in high temperature environments, the angle is decreased to reduce energy consumption. The variable pitch structure of the spiral guide channel causes the rotation speed of the bubble group to increase gradually during the ascent, forming a stable swirling field in the upper part of the pool, effectively extending the gas-liquid reaction time.

[0041] Considering the biofilm characteristics of the MBBR process, the controllable turbulence generated by the baffle plate 3 can prevent excessive biofilm thickening while promoting microbial metabolic activity. The quick-assembly and disassembly design of the intercepting screen 4 can significantly shorten the maintenance cycle and ensure the stability of continuous system operation. The synergistic effect of the variable diameter section 22 and the spiral guide channel significantly improves oxygen transfer efficiency while reducing the risk of sludge deposition at the bottom of the tank. The entire system achieves an organic unity of aeration uniformity, energy economy, and maintenance convenience through structural innovation, providing reliable technical support for the optimization of the MBBR process.

[0042] Example 2

[0043] The aeration mechanism disclosed in this embodiment adopts a modular design, with systematic optimization in tank structure and airflow distribution strategy. The aerobic tank unit is changed to a symmetrical double-corridor layout, with a flow guide wall in the middle dividing the tank into two independent aeration zones that operate in parallel. The main aeration pipe 1 is arranged parallel to both sides of the partition wall, and the extension direction of the branch pipes is orthogonal to the water flow path, forming a grid-like air curtain distribution. The branch pipes adopt a split structure, with the section near the main pipe being a straight pipe of equal diameter, and the end connected to a rotatable and adjustable fan-shaped diffuser. The diffuser blade angle can be manually adjusted within the range of 15°-60°. The baffle plate 3 is changed to a wavy curved surface structure, with staggered flow guide windows opened longitudinally on the plate, and detachable turbulence fins set on the edge of the window frame.

[0044] In this implementation, the intercepting screen 4 is optimized into a double-layer composite structure. The inner layer is a hexagonal honeycomb rigid frame, and the outer layer is covered with an elastic filter screen. The two are quickly assembled using snap-fit ​​connectors. The bottom guide groove of the screen is replaced with a T-shaped slide rail, which slides in conjunction with the convex guide rail at the top of the branch pipe. During maintenance, it can be pulled out as a whole along the axial direction of the branch pipe. The variable diameter section 22 adopts a replaceable nozzle structure, providing three flow channel schemes: gradually expanding, Venturi, and swirl, which can be selected for installation according to changes in water quality load. The spiral guide groove is replaced with an external adjustable guide ring. The ring body is threaded and sleeved on the outer wall of the compression section 222. Rotating the ring body can change the cutting angle of the guide vanes. An airflow distributor is added to the connection node between the aeration main pipe 1 and the branch pipe. A conical regulating valve core is installed inside, and the air volume distribution ratio of the branch pipe is controlled by an external handwheel. The turbulence fins of the baffle 3 guide window are made of shape memory alloy material, which can automatically adjust the curvature according to changes in water temperature. At low temperatures, the curvature increases to enhance turbulence intensity, and at high temperatures, it flattens to reduce flow resistance. The outer filter screen of interception screen 4 has an adaptive deformation structure. When the load of suspended solids increases, the mesh changes from a circle to an ellipse under the action of fluid pressure, which increases the throughput while maintaining the interception efficiency.

[0045] The modular branch pipe system allows for quick replacement of aeration components. When treating high-concentration wastewater, gradient aeration pipes with decreasing orifice diameters can be installed; for oily wastewater, they can be replaced with swirl aeration heads made of an oleophobic material. The turbulence fins of the flow guide window are magnetically secured, and their installation position and density can be adjusted based on flow observations. The flow channel design of the 22 nozzles in the variable diameter section can be switched using a special tool, allowing for type conversion without disassembling the main pipe. The threaded adjustment mechanism of the external guide ring has graduated markings; every 5° rotation corresponds to a 1° change in the flow guide angle, enabling precise flow control.

[0046] In this embodiment, the modular design enables the aeration system to adapt to different operating conditions, allowing for rapid component replacement to match varying water quality characteristics. Furthermore, the adjustable flow guiding mechanism creates a dynamic flow field, transforming the biofilm carrier's movement trajectory from random diffusion to controlled circulation, thus improving carrier utilization. The composite screen structure maintains retention performance while extending the cleaning cycle by 2-3 times. Actual operation shows that this solution maintains stable dissolved oxygen concentration even when influent COD fluctuates by ±30%, significantly enhancing the system's resistance to shock loads.

Claims

1. An aeration mechanism for sewage treatment, characterized by comprising: The application relates to an aeration device for a pool body. The aeration main pipe (1) is longitudinally arranged in the pool body, and the outer wall of the aeration main pipe is axially and equidistantly provided with at least three groups of horizontally-extended aeration branch pipes (2); the bottom surface of the aeration branch pipe is provided with equidistantly-distributed aeration holes (21), and the tail end extends to below the installation position of a movable flow baffle (3); the flow baffle is transversely connected between two adjacent aeration branch pipes, and the bottom edge of the flow baffle is matched with the outer diameter curved surface of the aeration branch pipe.

2. An aeration mechanism according to claim 1, wherein: The aeration holes (21) are distributed in a hole diameter gradient decreasing mode along the extension direction of the branch pipe, and the decreasing amplitude is positively correlated with the distance from the tail end of the branch pipe to the main pipe.

3. The aeration mechanism of claim 1, wherein: The flow baffle (3) is provided with staggered flow guide units (31) on the flow-encountering surface, and the flow guide units (31) comprise a convex part (311) with an inclination angle of 10-30 DEG with the plate surface and an adjusting through hole (312) penetrating through the plate body.

4. The aeration mechanism of claim 1, wherein: The aeration device further comprises a plurality of groups of interception screen meshes (4), and the bottom of the interception screen mesh (4) is embeddedly connected with the bottom of the pool body through dovetail grooves (41).

5. An aeration mechanism according to claim 4, wherein: The interception screen mesh (4) is provided with a through hole array, and the through hole array comprises a vertical frame part and a horizontal connecting part; the through hole of the vertical frame part is an equilateral polygon, and the through hole of the horizontal connecting part is a rectangle with a length-width ratio of 1:2-1:

3.

6. An aeration mechanism according to any one of claims 1 to 5, wherein: The tail end of the aeration branch pipe (2) is provided with a variable-diameter part (22), and the variable-diameter part comprises a flow guide fan surface (221) which is gradually expanded along the horizontal direction and a compression section (222) which extends to the pool bottom.

7. An aeration mechanism according to claim 6, wherein: The inner wall of the compression section (222) is provided with a spiral guide groove, and the spiral angle of the spiral guide groove is increased by 5 DEG -15 DEG from the connection end to the free end.

8. The aeration mechanism of claim 3, wherein: The adjusting through hole (312) is embedded with a rotatable flow guide fin (313), the edge of the flow guide fin (313) is provided with a limiting tooth which is engaged with a ring-shaped tooth groove arranged on the inner wall of the adjusting through hole (312).

Images