A self-cleaning sewage device for a gill-type aerator

Abstract

This invention relates to the field of water treatment aeration equipment technology, and particularly to a self-cleaning and sewage discharge device for a gill aerator. The device includes an aeration assembly and a cleaning assembly. The aeration assembly includes a horizontal seat and an aeration pipe. The cleaning assembly includes several gill fins and a flower-shaped end cap. The gill fins are all annular structures, and are stacked together to form a tubular structure resembling fish gills. An intermediate body is fitted inside each gill fin, and a fixing sleeve is connected to the top of the intermediate body. A fixing nut is connected to the top of the fixing sleeve. The flower-shaped end cap is fitted outside the fixing sleeve, and a connecting spring is placed between the fixing nut and the flower-shaped end cap. A sealing end cap is installed on the top of the flower-shaped end cap. This invention achieves dynamic adjustment of the gill fin spacing through a mechanical structure, automatically cleaning internal blockages without disassembling the equipment, thus improving the operational stability and service life of the aerator.

Description

Technical Field

[0001] This invention relates to the field of water treatment aeration equipment technology, and in particular to a self-cleaning sewage discharge device for a gill aerator. Background Technology

[0002] Currently, tubular aerators are widely used in the field of wastewater treatment. Their core aeration components have a dense porous structure. During long-term operation, sludge, microorganisms and impurities in the wastewater are prone to adhere to the gaps in the aeration holes, causing channel blockage, uneven air distribution, a significant decrease in oxygen mass transfer efficiency, and even aerator failure.

[0003] In the existing technology, traditional aerators do not have a self-cleaning function, and need to be stopped, disassembled and cleaned manually. This results in high operation and maintenance costs, affects the continuity of production, and is difficult to clean. The gill spacing is fixed, and impurities are difficult to be discharged by water or air flow after they are embedded. Long-term accumulation leads to performance degradation. Cleaning devices are mostly external rinsing, which cannot penetrate into the gaps inside the gills, resulting in limited cleaning effect. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of the lack of economical and efficient self-cleaning methods in the prior art, and to propose a gill aerator self-cleaning sewage discharge device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a gill aerator self-cleaning and sewage discharge device, comprising an aeration component and a cleaning component.

[0006] The ventilation assembly includes a horizontal seat and an aeration pipe. The aeration pipe is installed on the top of the horizontal seat and is connected to the horizontal seat. The aeration pipe is also connected to an external ventilation device.

[0007] The cleaning component includes several gill fins and a flower-shaped end cap. The gill fins are all annular structures, and the gill fins are stacked together to form a tubular structure similar to fish gills. An intermediate body is sleeved inside the gill fins, and a first aeration gap is formed between the intermediate body and the gill fins. A fixed bushing is connected to the top of the intermediate body, and a fixed nut is threaded to the top of the fixed bushing. The flower-shaped end cap is sleeved outside the fixed bushing, and a support platform is provided on the inner side of the flower-shaped end cap. The support platform and the fixed bushing are in a sealed sliding fit. A connecting spring is placed between the fixed nut and the support platform. A second aeration gap is formed between the flower-shaped end cap and the gill fins. A sealing end cap is installed on the top of the flower-shaped end cap.

[0008] In the above-mentioned gill-type aerator self-cleaning sewage discharge device, the horizontal seat is installed at the bottom of the biological tank and kept horizontal. A horizontal bubble is installed on the side wall of the horizontal seat. The lower side of the horizontal seat is hollowed out to form two connected hollow structures. A lower base cover is fixedly connected to the top of the horizontal seat. An upper base cover is fixedly connected to the top of the lower base cover by bolts. The aeration pipe is installed between the lower base cover and the upper base cover.

[0009] In the above-mentioned gill-type aerator self-cleaning sewage discharge device, the bottom of the aeration pipe has several air holes, which are connected to the hollow structure at the lower end of the horizontal seat. A rubber sealing plug is installed on the outside of the air hole at the contact part between the horizontal seat and the aeration pipe. Both ends of the hollow structure of the horizontal seat are fixed with connecting ends. An intermediate body is installed inside the connecting end, and gill plates are connected to the outside of the connecting end.

[0010] In the above-mentioned self-cleaning and sewage discharge device for a gill aerator, the intermediate body is a tubular structure, the outer diameter of the intermediate body is smaller than the inner diameter of the gill fin, and the gap between the inner wall of the gill fin and the outer wall of the intermediate body is in the range of 0.5mm to 3mm.

[0011] In the above-mentioned gill-type aerator self-cleaning sewage discharge device, the fixed bushing is a coaxial integrally formed rotating body structure, one end of which is a small-diameter shaft section with external threads, and the other end is a large-diameter hollow cylinder section with external threads along the axial direction on the outer peripheral wall. The small-diameter shaft section is coaxially fixed to the center of the closed end face of the large-diameter hollow cylinder section.

[0012] In the above-mentioned gill-type aerator self-cleaning sewage discharge device, the top of the intermediate body has an installation groove and the side wall of the installation groove has an internal thread, the bottom outer wall of the fixed bushing has an external thread, and the external thread of the outer wall of the large-diameter hollow cylinder section at the bottom of the fixed bushing is threadedly fixedly connected to the internal thread at the top of the intermediate body.

[0013] In the above-mentioned self-cleaning and sewage discharge device for a gill aerator, the flower-shaped end cap is a coaxially integrally formed rotating structure. The main body of the rotating structure of the flower-shaped end cap is a stepped shaft structure, which includes at least three shaft segments of different diameters. The shaft segments are connected by a shoulder. The outermost shaft segment of the flower-shaped end cap has the same outer diameter as the gill fin but a thickness greater than that of the gill fin. The innermost shaft segment of the flower-shaped end cap has an inner diameter greater than that of the small-diameter shaft segment of the fixed bushing. A support platform extends from the middle section of the flower-shaped end cap connecting the inner and outer shaft segments, near the side of the fixed bushing. The support platform is in a sealed sliding connection with the small-diameter shaft segment of the fixed bushing.

[0014] In the above-mentioned gill aerator self-cleaning sewage discharge device, the outer wall of the innermost shaft section of the flower-shaped end cap is provided with external threads, the sealing end cap is a hollow cylindrical structure and the inner wall is provided with internal threads, and the sealing end cap is threadedly connected to the flower-shaped end cap.

[0015] Compared with existing technologies, the advantages of this invention are:

[0016] 1. This invention utilizes the linkage between the intermediate body, fixed bushing, connecting spring, and flower-shaped end cap, eliminating the need for additional electric or hydraulic cleaning accessories. When the aeration gap is blocked by sludge, the air resistance of the first aeration gap increases, and the internal air pressure of the intermediate body rises synchronously. This air pressure drives the flower-shaped end cap to actively expand the second aeration gap and the gill gap, reducing the clamping force of impurities in the gaps. Under the flushing effect of the high-speed gas-liquid mixture, the impurities automatically fall off and are discharged. After the blockage is cleared, the air pressure drops. The entire self-cleaning process is driven by the pressure of the aeration air source itself, eliminating the need to stop and disassemble the equipment, ensuring continuous operation of the aeration process, and automatically resetting by the compression force of the spring. This significantly reduces the wastewater treatment capacity loss caused by shutdowns due to blockages.

[0017] 2. This invention utilizes a pneumatic linkage structure consisting of an intermediate body, a fixed bushing, and a flower-shaped end cap. The opening and closing width of the second aeration gap can be adjusted by regulating the airflow, flexibly matching the aeration requirements of different water qualities. Under normal aeration conditions, the two air pressures are balanced, and the gap maintains a standard width. Multiple layers of gills, combined with an annular air outlet channel, ensure evenly dispersed air bubbles. For wastewater with high sludge levels, the inlet pressure can be increased to widen the gap, ensuring both fine and uniform aeration bubbles and preventing gap clogging. Unlike traditional fixed-gap aerators that cannot adapt to changes in water quality, this device relies on a pneumatic pressure structure to adaptively adjust the air outlet cross-section, maintaining stable and efficient aeration and oxygenation throughout the process.

[0018] 3. This invention adopts a layered modular assembly structure consisting of a horizontal seat, intermediate body, gill fins, and flower-shaped end caps. Each component can be independently disassembled and assembled without interference. An airflow detection element can be installed inside the horizontal seat to quickly locate the fault point of gill fin damage or air leakage by comparing the air pressure difference between a single aeration unit and the entire pipeline. During maintenance, only the sealing end cap and the flower-shaped end cap need to be disassembled in sequence to remove the damaged gill fin for inspection and replacement, without having to dismantle the entire aeration pipe. At the same time, the horizontal bubble assists in precise leveling of the horizontal seat, ensuring high consistency of air supply from multiple aeration nozzles. Damage to a single component will not affect the normal operation of other aeration units in the entire pipeline, greatly simplifying the maintenance process and reducing parts wear and labor maintenance time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a gill aerator self-cleaning sewage discharge device proposed in this invention.

[0020] Figure 2 This is a schematic diagram of the cleaning component of a self-cleaning sewage discharge device for a gill aerator proposed in this invention.

[0021] Figure 3 This is a schematic diagram of the cleaning component of a self-cleaning sewage discharge device for a gill aerator proposed in this invention from another perspective.

[0022] Figure 4 This is a schematic diagram of the internal structure of the cleaning component of a self-cleaning sewage discharge device for a gill aerator proposed in this invention.

[0023] Figure 5 This is a schematic diagram of the unfolded structure of the cleaning component of a self-cleaning sewage discharge device for a gill aerator proposed in this invention.

[0024] Figure 6 This is a schematic diagram of the unfolded structure of the cleaning component of the self-cleaning sewage discharge device for a gill aerator proposed in this invention from another perspective.

[0025] Figure 7 This is a schematic diagram of the structure of the fixing bushing of the self-cleaning sewage discharge device for a gill aerator proposed in this invention;

[0026] Figure 8 This is a half-sectional structural diagram of the flower-shaped end cap of a gill-type aerator self-cleaning sewage discharge device proposed in this invention.

[0027] In the diagram: 1. Gill fin; 2. Intermediate body; 3. First aeration gap; 4. Fixed bushing; 5. Fixed nut; 6. Connecting spring; 7. Flower-shaped end cap; 8. Support platform; 9. Second aeration gap; 10. Sealing end cap; 11. Connecting end; 12. Horizontal seat; 121. Horizontal bubble; 13. Lower cover of base; 14. Aeration pipe; 141. Vent hole; 15. Upper cover of base. Detailed Implementation

[0028] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0029] Example 1

[0030] Reference Figure 1-8 A self-cleaning and sewage discharge device for gill aerators includes an air supply component and a cleaning component. The air supply component is used to centrally supply air to multiple aerators. The air supply component is connected to an external air supply device and supplies air to the horizontal seat 12 at the bottom of multiple air holes 141 through the air supply pipe 14. The horizontal seat 12 is horizontally installed with the assistance of the horizontal bubble 121. The air entering the lower end of the horizontal seat 12 flows evenly to both ends, enters the interior of the intermediate body 2 and the first aeration gap 3 between the intermediate body 2 and the gill fin 1 through the connecting end 11, and the airflow through the first aeration gap 3 finally enters the liquid interior through the gap of the gill fin 1, achieving a uniform aeration effect. The airflow entering the interior of the intermediate body 2 provides power for subsequent self-cleaning.

[0031] The cleaning device is used to achieve a self-cleaning effect during aeration. It mainly includes gill fins 1, intermediate body 2, flower-shaped end caps 7, and sealing end caps 10. Multiple annular gill fins 1 are nested together to form a "tubular structure". The surface of the annular gill fins 1 has an inclined line pattern structure to ensure that there is an initial gap between the annular gill fins 1 and that they do not fit too tightly. When adjacent gill fins 1 are stacked, the upper end face of the inclined line pattern structure of the lower gill fin 1 abuts against the lower end face of the upper gill fin 1, so that the stacked gill fins 1 naturally form a uniform and consistent axial aeration gap. The intermediate body 2 is a long tubular structure with a diameter smaller than that of the gill fin 1. It is integrated with the connecting end 11 and extends from the port of the gill fin 1 to form the intermediate body 2. The intermediate body 2 is located inside the gill fin 1. A first aeration gap 3 is formed between the intermediate body 2 and the gill fin 1. Gas passes through the ventilation component and finally enters the first aeration gap 3. It is blown out from the gaps between multiple gill fins 1 and the second aeration gap 9, forming a uniform and diffused aeration effect. A fixed bushing 4 is connected to the top of the intermediate body 2. A fixed nut 5 is threaded to the top of the fixed bushing 4. A flower-shaped end cap 7 is fitted outside the fixed bushing 4. A support platform 8 is provided inside the flower-shaped end cap 7. The support platform 8 contacts the fixed bushing 4. A connecting spring 6 is placed between the fixed nut 5 and the support platform 8. A second aeration gap 9 is formed between the flower-shaped end cap 7 and the gill fin 1. A sealing end cap 10 is installed on the top of the flower-shaped end cap 7.

[0032] The connection end 11 has a flow-dividing chamber structure inside, where the compressed gas entering from the horizontal seat 12 is divided into two independent paths:

[0033] The first path is the aeration path. The gas enters the first aeration gap 3 between the outer wall of the intermediate body 2 and the inner wall of the gill 1 through the annular air outlet at the upper end of the connecting end 11. After the gas rises axially along the first aeration gap 3, it is sprayed out from the axial gap between each gill 1 and the second aeration gap 9 to the surrounding area and enter the water body to complete the aeration and oxygenation.

[0034] The second path is the driving air path, which enters the central cavity of the intermediate body 2 through the split air inlet 17 in the center of the connecting end 11. The upper end of the intermediate body 2 is threadedly sealed to the large-diameter hollow cylinder section of the fixed bushing 4. The internal cavities of the two together form a closed air cavity.

[0035] During normal aeration, the air pressure in the inner cavity of the intermediate body 2 and the first aeration gap 3 are kept in balance. The fixed bushing 4 is threaded to the intermediate body 2, which forms a blockage on the side of the intermediate body 2 near the flower-shaped end cap 7. When gas is introduced, a thrust is generated, which causes the fixed bushing 4 and the intermediate body to move a certain distance away from the horizontal seat 12. The end of the intermediate body 2 pushes the flower-shaped end cap 7 to lift up. The width of the second aeration gap 9 can be finely adjusted by controlling the airflow to adapt to different aeration needs. During aeration, the distance between the flower-shaped end cap 7 and the connecting end 11 is the unfolding space of the "tubular" gill fin 1. The smaller the distance, the smaller the distance between the multiple sleeved gill fins 1. The larger the distance, the larger the distance between the multiple sleeved gill fins 1.

[0036] When the axial gap between the gill fins 1 and the second aeration gap 9 are blocked by impurities such as sludge and biofilm, the air outlet resistance of the aeration air path increases sharply, and the air pressure in the first aeration gap 3 increases synchronously. Since the aeration air path and the drive air path are supplied with air from the same source, the air pressure in the closed air chamber rises synchronously, and the axial thrust acting on the support platform 8 increases accordingly. When the thrust exceeds the pre-tightening force of the connecting spring 6, it pushes the flower-shaped end cap 7 to slide away from the gill fins 1 along the small diameter shaft section of the fixed bushing 4.

[0037] During the upward movement of the flower-shaped end cap 7, the second aeration gap 9 expands first, and at the same time, each layer of gill fins 1 loses the axial clamping force. Under the combined action of the internal airflow thrust and the buoyancy of the water, they disperse sequentially along the axial direction, and the interlayer gap increases synchronously. The clamping force on both sides of the blockage in the gap is greatly reduced, and under the flushing of the high-speed gas-liquid mixed flow, it falls off from the gap and is discharged outside the device with the water flow, completing the self-cleaning and sewage discharge.

[0038] After the blockage is cleared, the air resistance in the aeration path decreases, and the air pressure in the first aeration gap 3 and the closed air chamber decreases synchronously. The elastic force of the connecting spring 6 pushes the flower-shaped end cap 7 back towards the gill fin 1. The flower-shaped end cap 7 pushes the uppermost gill fin 1 back down synchronously. Finally, all gill fins 1 are sequentially positioned and returned to the initial stacked gap, and the device returns to normal aeration. The entire self-cleaning process is driven entirely by the pressure of the air source itself, without the need for shutdown and disassembly, and without the need for additional power components.

[0039] Installation details:

[0040] First, multiple horizontal seats 12 are installed horizontally on the aeration pipe 14 according to the arrangement of the air holes 141. The horizontal seats 12 are kept horizontal with the help of the horizontal bubbles. Multiple gill fins 1 are sequentially fitted onto each intermediate body 2 in the specified gill pattern direction to form the aeration body. The aeration body is connected to the horizontal seat 12 through the connecting end 11. Then, the fixing bushing 4 is installed and threaded to the inner wall of the intermediate body 2 to form a connecting structure. The flower-shaped end cap 7 is then connected to the end of the intermediate body 2.

[0041] Subsequently, the connecting spring 6 is fitted onto the fixed bushing 4, with one end abutting against the support platform 8 protruding from the inside of the flower-shaped end cap 7, and the other end being limited by the fixing nut 5 and the preload adjusted.

[0042] Finally, install the sealing end cap 10 and tighten it to complete the overall assembly.

[0043] During operation, the gill aerator self-cleans the bottom of the gas pipe, and the gas in the gas pipe is introduced into the inner side of the tubular intermediate body 2 and the first aeration gap 3 respectively.

[0044] The gas passes through the first aeration gap 3 formed by the gap between the gill 1 and the intermediate body 2, and finally sprays out from the second aeration gap 9 between the gill 1 and the flower-shaped end cap 7. The gas is sprayed out in a ring shape and enters the liquid from all sides, forming fine bubbles, thus achieving a highly efficient and uniform aeration effect.

[0045] The gas blown out from the first aeration gap 3 and the second aeration gap 9 forms a stable aeration effect, while the airflow entering the inside of the intermediate body 2 applies pressure to the flower-shaped end cap 7. The flower-shaped end cap 7 moves upward under pressure, and with the spring compression movement, the gap between the second aeration gap 9 and the gill fin 1 increases, and the degree of increase increases with the increase of the gas pressure inside the intermediate body 2. The sludge and impurities embedded in the gaps are washed away by the water flow and airflow and discharged with the water flow, achieving a self-cleaning effect. If the gill fin 1 is accidentally damaged, it can be clearly detected that the airflow pressure inside the aeration pipe 14 is different from that of other aeration pipes for a long time. The airflow detection device installed inside the air outlets at both ends of the horizontal seat 12 can further detect the status of the equipment, find the damaged part, and perform simple disassembly, maintenance or replacement. When the gill fin 1 is damaged, it is only necessary to remove the closed end cap 10 and the flower-shaped end cap 7, pull the gill fin 1 out of the intermediate body 2, observe and test to find the cause, and replace it. The maintenance methods and maintenance costs are greatly reduced.

[0046] Example 2

[0047] This embodiment further optimizes the sealing and protection based on Embodiment 1. At least one O-ring is installed between the inner wall of the support platform 8 of the flower-shaped end cap 7 and the small-diameter shaft section 41 of the fixed bushing 4 to prevent the internal driving gas from leaking to the outside or the first aeration gap 3 along the mating gap, thereby ensuring the pressure driving efficiency. At the same time, an annular flexible corrugated protective sleeve, made of silicone or PTFE material, is provided between the outermost shaft section of the flower-shaped end cap 7 and the top end face of the gill fin 1. One end of the protective sleeve is fixed to the outer edge of the outermost shaft section, and the other end is fitted on the outer wall of the top of the gill fin 1. It can expand and contract with the up and down movement of the flower-shaped end cap 7, which can prevent large particles of impurities and biofilm clumps from directly getting stuck in the second aeration gap 9, further extending the maintenance cycle.

[0048] Example 3

[0049] This embodiment provides an active self-cleaning and sewage discharge method, which can be implemented based on any of the devices described in Embodiments 1 to 10. A displacement sensor is installed on at least one flower-shaped end cap 7 or sealed end cap 10 to detect the displacement of the flower-shaped end cap 7 relative to the gill fins 1 in real time. The displacement sensor signal is connected to the programmable controller of the aeration system. The controller has preset normal operating displacement range and a blockage alarm threshold to flexibly reduce the initial cleaning threshold. When the alarm condition is met, the controller determines that a blockage has occurred and automatically executes the following cleaning procedure: controlling the air compressor or air supply valve to perform pulsed pressure fluctuations, i.e., "rapid pressurization → pressure holding for 2 seconds → pressure release → pressurization again," cycling 3 to 5 times. The combined effect of pressure impact and spring rebound causes high-frequency "opening and closing" vibrations in the gill fin gaps, efficiently removing stubborn deposits. During the evacuation phase before the aeration system shuts down, the controller can also continuously output higher air pressure to keep the flower-shaped end cap 7 at its maximum opening, while simultaneously increasing the water flow rate in the pool, using hydraulic flushing for comprehensive sewage discharge. This method combines mechanical self-cleaning with active control, significantly enhancing the reliability and adaptability of the device.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-cleaning and wastewater discharge device for a gill aerator, comprising an aeration component and a cleaning component, characterized in that, The ventilation assembly includes a horizontal seat (12) and an aeration pipe (14). The aeration pipe (14) is installed on the top of the horizontal seat (12) and is connected to the horizontal seat (12). The aeration pipe (14) is connected to an external ventilation device. The cleaning component includes several gill fins (1) and a flower-shaped end cap (7). The gill fins (1) are all annular structures. The gill fins (1) are stacked together to form a tubular structure similar to fish gills. An intermediate body (2) is sleeved inside the gill fins (1). A first aeration gap (3) is formed between the intermediate body (2) and the gill fins (1). A fixed bushing (4) is connected to the top of the intermediate body (2). A fixed nut (5) is threaded to the top of the fixed bushing (4). The flower-shaped end cap (7) is sleeved outside the fixed bushing (4). A support platform (8) is provided on the inner side of the flower-shaped end cap (7). The support platform (8) and the fixed bushing (4) are sealed and slidably fitted. A connecting spring (6) is placed between the fixed nut (5) and the support platform (8). A second aeration gap (9) is formed between the flower-shaped end cap (7) and the gill fins (1). A sealing end cap (10) is installed on the top of the flower-shaped end cap (7).

2. The self-cleaning and sewage discharge device for a gill aerator according to claim 1, characterized in that, The horizontal seat (12) is connected to the aeration pipe (14). The aeration pipe is fixed to the bottom of the pool by a pipe support, and the horizontal seat (12) is kept horizontal. A horizontal bubble (121) is installed on the side wall of the horizontal seat (12). The lower side of the horizontal seat (12) is hollowed out to form two connected hollow structures. The bottom cover (13) of the base is fixedly connected to the top of the horizontal seat (12). The top of the bottom cover (13) of the base is fixedly connected to the top cover (15) of the base by bolts. The aeration pipe (14) is installed between the bottom cover (13) of the base and the top cover (15) of the base.

3. The self-cleaning and sewage discharge device for a gill aerator according to claim 2, characterized in that, The aeration pipe (14) has several ventilation holes (141) at the bottom. The ventilation holes (141) are connected to the hollow structure at the lower end of the horizontal seat (12). A rubber sealing plug is installed on the outside of the ventilation holes (141) at the contact part between the horizontal seat (12) and the aeration pipe (14). The hollow structure of the horizontal seat (12) is connected to an intermediate body (2) at both ends. The intermediate body (2) is covered with axially stacked gill plates (1).

4. The self-cleaning and sewage discharge device for a gill aerator according to claim 1, characterized in that, The intermediate body (2) is a tubular structure. The outer diameter of the intermediate body (2) is smaller than the inner diameter of the gill lamella (1). The gap between the inner wall of the gill lamella (1) and the outer wall of the intermediate body (2) is 0.5 mm to 3 mm.

5. A self-cleaning and wastewater discharge device for a gill aerator according to claim 1, characterized in that, The fixed bushing (4) is a rotating body structure formed in one coaxial step. One end of it is a small diameter shaft section with external threads, and the other end is a large diameter hollow cylinder section with external threads on the outer peripheral wall along the axial direction. The small diameter shaft section is coaxially fixed to the center of the closed end face of the large diameter hollow cylinder section.

6. A self-cleaning and wastewater discharge device for a gill aerator according to claim 5, characterized in that, The top of the intermediate body (2) has an installation groove and the side wall of the installation groove has an internal thread. The bottom outer wall of the fixed bushing (4) has an external thread. The external thread of the outer wall of the large diameter hollow cylinder section at the bottom of the fixed bushing (4) is threadedly fixedly connected to the internal thread at the top of the intermediate body (2).

7. The self-cleaning and sewage discharge device for a gill aerator according to claim 1, characterized in that, The flower-shaped end cap (7) is a coaxial integral rotating structure. The main body of the rotating structure of the flower-shaped end cap (7) is a stepped shaft structure. The stepped shaft structure includes at least three shaft segments with different diameters. The shaft segments are connected by a shoulder. The outermost shaft segment of the flower-shaped end cap (7) has the same outer diameter as the gill fin (1) but a thickness greater than that of the gill fin (1). The innermost shaft segment of the flower-shaped end cap (7) has an inner diameter greater than that of the small diameter shaft segment of the fixed bushing (4). The middle section of the flower-shaped end cap (7) connecting the inner and outer shaft segments extends into a support platform (8) near the side of the fixed bushing (4). The support platform (8) is sealed and slidably connected to the small diameter shaft segment of the fixed bushing (4).

8. A self-cleaning and wastewater discharge device for a gill aerator according to claim 7, characterized in that, The innermost shaft section of the flower-shaped end cap (7) is provided with external threads, and the sealing end cap (10) is a hollow cylinder structure with internal threads on its inner wall. The sealing end cap (10) is threadedly connected to the flower-shaped end cap (7).

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