Multi-stage extruded spiral mixed jet aerator and jet aeration method

Abstract

This invention discloses a multi-stage extrusion spiral mixing jet aerator, comprising an extrusion mixing chamber, one end of which is connected to a water inlet pipe, and an air inlet pipe connected to the side wall of the extrusion mixing chamber. A double-spinning spiral mixing chamber is connected to the end of the extrusion mixing chamber away from the water inlet pipe. An accelerating conical tube is connected to the end of the double-spinning spiral mixing chamber away from the extrusion mixing chamber, and a six-pronged rotating nozzle is connected to the end of the accelerating conical tube away from the double-spinning spiral mixing chamber. This invention also discloses a jet aeration method using the multi-stage extrusion spiral mixing jet aerator. This invention can synergize multiple mixing methods while simultaneously possessing bubble refinement and oxygen transfer acceleration capabilities, comprehensively improving the overall efficiency of wastewater treatment systems and solving the problems of poor mixing effect and low oxygen transfer rate in current jet aerators.

Description

Technical Field

[0001] This invention belongs to the technical field of wastewater treatment equipment, specifically relating to a multi-stage extrusion spiral mixing jet aerator, and also to a jet aeration method of the jet aerator. Background Technology

[0002] Jet aeration devices are core equipment in aerobic wastewater treatment processes such as activated sludge. Their function is to increase the dissolved oxygen concentration in the water through efficient gas-liquid mixing, providing the necessary conditions for aerobic microorganisms to degrade pollutants. At the same time, they can fully mix the sludge and wastewater in the reaction tank, prevent sedimentation, and ensure the stability of the treatment effect.

[0003] Jet aerators typically operate based on the Venturi principle. High-pressure working liquid is forced through nozzles to form a high-speed jet, which strongly mixes with the supplied air in the mixing chamber. The gas-liquid two-phase flow undergoes intense shearing, impact, and turbulence within the throat and diffuser section, resulting in bubble breakage, dissolution, and mixing, ultimately forming a gas-liquid mixture rich in microbubbles that is sprayed into the water body. This process simultaneously accomplishes two key tasks: dissolved oxygen mass transfer rate and gas-liquid two-phase mixing. Its performance directly determines the efficiency, energy consumption, and operating costs of the wastewater treatment system.

[0004] Currently, common jet aeration technologies or equipment often struggle to simultaneously achieve the two core objectives of high-intensity mixing and high oxygen transfer rate during design and optimization. Some designs focus on enhancing shear and mixing by increasing the liquid jet velocity, sacrificing the effective residence time and mass transfer efficiency of the bubble swarm in the wastewater. Other designs, in pursuit of higher oxygen transfer efficiency, employ structures that are detrimental to generating a large-scale circulating flow field, resulting in low turbulence intensity and poor hydraulic mixing within the tank, easily creating dead zones in flow circulation and activated sludge deposition. This performance imbalance means that existing jet aerators, in practical applications, either fail to ensure uniform mixing of activated sludge in the aeration tank or fail to fully realize their potential for efficient oxygen mass transfer, limiting the overall performance improvement of air-supply jet aerators. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage extrusion spiral mixing jet aerator, which solves the problems of poor mixing effect and low oxygen mass transfer efficiency in existing jet aerators.

[0006] Another object of the present invention is to provide a jet aeration method for a multi-stage extrusion spiral mixing jet aerator.

[0007] The technical solution adopted in this invention is: a multi-stage extrusion spiral mixing jet aerator, including an extrusion mixing chamber, one end of which is connected to a water inlet pipe, and an air inlet pipe is connected to the side wall of the extrusion mixing chamber. The end of the extrusion mixing chamber away from the water inlet pipe is connected to a double-spinning spiral mixing chamber, and the end of the double-spinning spiral mixing chamber away from the extrusion mixing chamber is connected to an accelerating conical tube. The end of the accelerating conical tube away from the double-spinning spiral mixing chamber is connected to a six-pronged rotating nozzle.

[0008] The invention is further characterized in that, The water inlet pipe has a frustum-shaped structure. The smaller end of the water inlet pipe is connected to the extrusion mixing chamber. The inner wall of the water inlet pipe is uniformly connected with a first spiky grid, a second spiky grid, and a third spiky grid along its axial direction. The first spiky grid, the second spiky grid, and the third spiky grid are arranged alternately at ±20° along the axial direction of the water inlet pipe. The first spiky grid has 21 spiky grid holes evenly, the second spiky grid has 16 spiky grid holes evenly, and the third spiky grid has 11 spiky grid holes evenly.

[0009] The air intake pipe is located close to the water intake pipe. The inner wall of the air intake pipe is uniformly connected with a first guide cloud soft ring, a second guide cloud soft ring and a third guide cloud soft ring along its axis. Each soft ring has a 120° notch and the phase difference between the notches of adjacent soft rings is 120°.

[0010] The inner wall of the extrusion mixing chamber is connected in sequence along its axial direction by a connecting unit to a first segmented textured extrusion ball bowl, a second segmented extrusion ball bowl, and a third segmented extrusion ball bowl. The first segmented textured extrusion ball bowl, the second segmented extrusion ball bowl, and the third segmented extrusion ball bowl are each connected to three connecting units that are uniformly arranged along the circumference of the inner wall of the extrusion mixing chamber.

[0011] The connecting unit includes a bottom bolt rod. One end of the bottom bolt rod is connected to the connecting nut and the extrusion mixing chamber via a connecting washer. The other end of the bottom bolt rod is connected to a spring sleeve. One end of the spring sleeve is connected to a spring, and the other end of the spring is connected to a sealing baffle. The size of the sealing baffle matches the inner wall of the spring sleeve. Multiple sealing baffles are connected one-to-one with a primary segmented ball cup, a secondary segmented ball cup, and a tertiary segmented ball cup.

[0012] The first-level lobed spherical bowl has several triangular pyramidal protrusions evenly connected inside; the second-level lobed spherical bowl has several conical protrusions evenly connected inside; and the third-level lobed spherical bowl has several quadrangular pyramidal protrusions evenly connected inside.

[0013] The double-spinning ribbon mixing chamber has cross-shaped support rods at both ends. A first end cap and a second end cap are connected at the intersection of the support rods. An angular contact ball bearing is connected between the first end cap and the second end cap. A ribbon center rod is connected between the two angular contact bearings. An outer ribbon and an inner ribbon are coaxially connected to the body of the ribbon center rod. The outer ribbon is right-handed and the inner ribbon is left-handed. The degree of twist of the inner ribbon is lower than that of the outer ribbon.

[0014] One end of the dual-spinning ribbon mixing chamber is connected to a second connecting flange, and the end of the extrusion mixing chamber is connected to a first connecting flange. A first flange gasket is provided between the second connecting flange and the first connecting flange. The first connecting flange is connected to the second connecting flange. The other end of the dual-spinning ribbon mixing chamber is connected to a third connecting flange. The end of the accelerating conical tube is connected to a fourth connecting flange. A second flange gasket is provided between the third connecting flange and the fourth connecting flange. The third connecting flange is connected to the fourth connecting flange.

[0015] The six-pronged rotary nozzle includes a nozzle connecting threaded tube, which is threadedly connected to an acceleration conical tube. A bearing sealing housing is connected to the side of the nozzle connecting threaded tube away from the acceleration conical tube via several circumferentially arranged bolts. A double-row tapered roller bearing is connected inside the bearing sealing housing, mounted back-to-back. A first positioning element and a second positioning element are connected to both ends of the bearing sealing housing, respectively. A first sealing gasket is provided between the first positioning element and the bearing sealing housing, and a second sealing gasket is provided between the second positioning element and the bearing sealing housing. A connecting cylinder is connected to the side of the bearing sealing housing away from the nozzle connecting threaded tube via several circumferentially arranged second bolts passing through the first positioning element. Six three-hole nozzles are evenly connected circumferentially to the connecting cylinder. A hemispherical cavity is connected to the side of the connecting cylinder away from the bearing sealing housing. Several frustum-shaped nozzles are evenly connected to the surface of the hemispherical cavity, and each frustum-shaped nozzle has a cross groove at its end.

[0016] Another technical solution adopted in this invention is a jet aeration method using a multi-stage extrusion spiral mixing jet aerator, specifically implemented according to the following steps: Step 1: Place the jet aerator in the wastewater environment of the aerobic section, and connect the inlet pipe to the circulation pump; Step 2: Wastewater is pretreated by three alternating barbed grids in the inlet pipe and then mixed with air that has been treated by three-stage guide cloud soft rings in the air inlet pipe in the compression mixing chamber. Step 3: The gas-liquid-solid mixture enters the double-spinning ribbon mixing chamber through the three-stage segmented textured extrusion ball bowl in the extrusion mixing chamber; Step 4: The gas-liquid mixture that has passed through the double-spinning spiral mixing chamber flows through the accelerating conical tube and is finally ejected from the round hole and the frustum nozzle of the three-hole nozzle.

[0017] The beneficial effects of this invention are as follows: 1. The inlet pipe has an internal barbed grid screen with evenly distributed multi-faceted barbed diversion slices at the intersections of the grid holes. This design achieves water pretreatment through a dual function: firstly, it creates mechanical shearing and turbulence effects on the water entering the pipe, disrupting the laminar boundary layer and promoting wastewater diversion, providing a larger contact interface for gas-liquid mass transfer in the subsequent mixing chamber; secondly, the sharp barbed edges intercept and disperse large suspended particles in the water, avoiding the risk of blockage in downstream structures. The consistent size of the grid holes ensures uniform flow velocity distribution across the cross-section, eliminating local eddy dead zones, thus guaranteeing consistent pretreatment results and simplifying the manufacturing and assembly process. 2. The intake duct is equipped with a three-stage partial flow-guiding cloud soft ring. This design innovatively combines the Venturi effect with dynamic disturbance. Through the three-stage cloud soft ring structure with gradually changing diameters of large-small-large, the air undergoes periodic changes in velocity and alternating fluctuations in pressure as it flows through, which significantly enhances the air entrainment ability and the initial atomization effect. 3. The three-stage segmented textured extrusion bowls are arranged in series and staggered, with the raised texture on the inner surface of each stage of the extrusion bowl presenting a differentiated design; the differentiated design of the three-stage segmented textured structure allows the gas-liquid-solid multiphase fluid to undergo a step-by-step processing flow of coarse separation-fine separation-precision separation in sequence during the extrusion section, and the bubble breaking efficiency gradually increases with the increase of the number of processing stages, and the gas-liquid contact area gradually increases; 4. The inner and outer double-layer spiral ribbons, which twist along their own spiral direction, adopt a differentiated composite structure design. Through asymmetric parameter configuration, a strong axial-radial composite flow field is constructed. The inner spiral ribbon achieves efficient shaking and directional transport of fluid in the central area through spiral lift angle optimization, while the outer spiral ribbon enhances the turbulent disturbance and circulation of fluid near the wall through variable pitch design. The two form a gradient three-dimensional stirring flow field, which fundamentally solves the problems of insufficient mixing in the central area and fluid retention on the wall in traditional spiral ribbons. 5. The first stage of the biomimetic castor bean capsule's six-pronged rotating nozzle has six nozzles evenly distributed at 60° along the circumference. Each nozzle has a nozzle opening at a 45° downward angle, which generates a strong shearing effect when the jet collides with the water, causing secondary breakup of bubbles and improving oxygen transfer efficiency. The symmetrical layout of the nozzles reduces radial vibration caused by fluid impact, improving long-term operational stability. The oblique opening design creates a velocity gradient in the water, with the upper jet driving the surface water circulation and the lower jet causing the bottom water to surge, creating complementary disturbance areas between the jets and avoiding the jet interference phenomenon present in traditional aerators. 6. The cross-shaped shallow groove divides the nozzle outlet into four fan-shaped regions. The combination of the cross-shaped shallow groove and the fan-shaped regions creates a dynamic "diversion-convergence" process, causing periodic pressure fluctuations in the gas-liquid two-phase fluid as it passes through the nozzle. This pulsating effect enhances the surface renewal rate of bubbles and promotes the transfer of dissolved oxygen to the water. The taper of the frustum nozzle and the depth of the cross-shaped shallow groove work synergistically to reduce exit kinetic energy loss while ensuring jet penetration, allowing the gas-liquid mixture to maintain high turbulence intensity at a greater distance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the water inlet pipe in this invention; Figure 4 This is a schematic diagram of the internal structure of the intake pipe in this invention; Figure 5 This is a schematic diagram of the internal structure of the extrusion mixing chamber in this invention; Figure 6 This is a schematic diagram of the connection unit in this invention; Figure 7 This is a schematic diagram of the structure of the first-stage segmented ball bowl in this invention; Figure 8 This is an exploded view of the structure of the two-part spherical bowl in this invention; Figure 9 This is a schematic diagram of the structure of the three-stage segmented ball bowl in this invention; Figure 10 This is an exploded view of the internal structure of the dual-spinning spiral mixing chamber in this invention; Figure 11 This is a cross-sectional view of the dual-spinning spiral ribbon mixing chamber in this invention; Figure 12 This is a schematic diagram of the connection structure between the two ends of the dual-spinning spiral mixing chamber in this invention; Figure 13 for Figure 12 Enlarged view of point A in the middle; Figure 14 for Figure 12 Enlarged view of point B in the middle; Figure 15 This is a cross-sectional view of the accelerating tapered tube in this invention; Figure 16 This is an exploded view of the six-pronged rotating nozzle in this invention; Figure 17 This is a cross-sectional view of the end structure of the six-pronged rotating nozzle in this invention; Figure 18 This is a cross-sectional view of the frustum nozzle in this invention.

[0019] In the diagram: 1. Inlet pipe, 11. First spiked grille, 12. Second spiked grille, 13. Third spiked grille, 2. Inlet pipe, 21. First guide cloud soft ring, 22. Second guide cloud soft ring, 23. Third guide cloud soft ring, 3. Extrusion mixing chamber, 31. Connecting gasket, 32. Connecting nut, 33. First connecting flange, 34. First flange gasket, 4. First segmented textured extrusion ball cup, 41. Triangular pyramidal raised texture, 42. First-stage segmented ball cup, 43. Sealing baffle, 44. Spring sleeve, 45. Spring, 46. Bottom bolt rod, 5. Second segmented textured extrusion ball cup, 51. Conical raised texture, 52. Second-stage segmented ball cup, 6. Third segmented textured extrusion ball cup, 61. Quadrilateral pyramidal raised texture, 62. Third-stage segmented ball cup, 7. Double-spinning spiral ribbon mixing chamber, 71. Support rod, 72. Angular contact ball bearing, 73. First end cap, 74. Second end cap, 75. Second connecting flange, 76. Third connecting flange, 77. Second flange gasket, 8. Inner and outer double-layer spiral ribbon, 81. Outer spiral ribbon, 82. Inner spiral ribbon, 83. Spiral ribbon center rod, 9. Accelerating tapered tube, 91. Fourth connecting flange, 92. First bolt, 10. Hexagonal rotating nozzle, 101. Nozzle connecting threaded tube, 102. Bearing sealing housing, 103. First sealing washer, 104. Second bolt, 105. First positioning element, 106. Tapered roller bearing, 107. Second sealing washer, 108. Second positioning element, 109. Three-hole nozzle, 110. Hemispherical cavity, 111. Frustum nozzle, 112. Connecting cylinder. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] Multi-stage extrusion spiral mixing jet aerator, such as Figure 1-2As shown, it includes an extrusion mixing chamber 3, one end of which is connected to a water inlet pipe 1, and an air inlet pipe 2 is connected to the side wall of the extrusion mixing chamber 3. The end of the extrusion mixing chamber 3 away from the water inlet pipe 1 is connected to a double-spinning spiral ribbon mixing chamber 7. The end of the double-spinning spiral ribbon mixing chamber 7 away from the extrusion mixing chamber 3 is connected to an accelerating conical tube 9. The end of the accelerating conical tube 9 away from the double-spinning spiral ribbon mixing chamber 7 is connected to a six-pronged rotating nozzle 10. The six-pronged rotary nozzle 10 is a biomimetic castor bean capsule structure. The front end of the water inlet pipe 1 is used to introduce the liquid fluid to be treated. The lower end of the air inlet pipe 2 is connected from the side wall of the extrusion mixing chamber 3. The accelerating conical tube 9 has a tapered structure with a gradually decreasing diameter, which can further increase the flow rate of the gas-liquid two-phase fluid. When the equipment is running, the liquid fluid enters the extrusion mixing chamber 3 after being pre-treated by the spiky grid of the water inlet pipe 1. At the same time, the air is pre-dispersed by the guide cloud soft rings of each stage of the air inlet pipe 2 and then injected into the extrusion mixing chamber 3. The gas-liquid two-phase fluid is initially mixed by the dynamic shearing and extrusion of the three-stage segmented textured extrusion ball bowl in the extrusion section. Then it enters the double-spinning spiral ribbon stirring mixing chamber 7 and is further mixed by the composite flow field of the inner and outer double-layer spiral ribbons 8. The flow rate is then increased by the accelerating conical tube 9, and finally it is sprayed into the water by the six-pronged rotary nozzle 10 of the biomimetic castor bean capsule, completing the efficient gas-liquid mass transfer process.

[0022] Example 1 like Figure 3As shown, the water inlet pipe 1 has a frustum-shaped structure. The smaller end of the water inlet pipe 1 is connected to the extrusion mixing chamber 3. The inner wall of the water inlet pipe 1 is uniformly connected with a first spiky grid 11, a second spiky grid 12, and a third spiky grid 13 along its axial direction. The first spiky grid 11, the second spiky grid 12, and the third spiky grid 13 are arranged alternately at ±20° along the axial direction of the water inlet pipe 1. Each level of spiky grid is deflected by 45° along the circumference of the spiky grid of the level above it. This causes the water flow to generate continuous turning and swirling when passing through the grid, further enhancing the turbulence of the water flow and laying a good foundation for subsequent gas-liquid mixing. The first spiky grid 11 is uniformly provided with 21 spiky grid holes, the second spiky grid 12 is uniformly provided with 16 spiky grid holes, and the third spiky grid 13 is uniformly provided with 11 spiky grid holes. Spiky diverting slices are distributed at the intersection center of the grid holes, with the sharp edges at the center being larger than those near the boundary. These slices not only provide initial cutting and disturbance to the incoming water flow, disrupting its laminar flow and creating finer air bubbles for more thorough contact with the gas in the mixing chamber, but also effectively intercept larger impurities in the water, preventing them from entering subsequent structures and causing blockages. The size of the spiked grid holes is consistent across each stage, and the number of holes decreases by five with each stage along the axial direction. The first spiky grid 11 has 21 grid holes, which initially guide the liquid fluid entering the pipe and intercept and cut large particles of impurities, preventing subsequent structures from being blocked by large impurities. The second spiky grid 12 has 16 grid holes and is deflected 45° along the circumference of the first spiky grid 11, forming local vortices in the flow field, causing the liquid fluid to produce a pre-swirling flow state and enhancing the turbulence of the fluid. The third spiky grid 13 is deflected 45° relative to the second spiky grid 12 and has 11 grid holes, which shear the pre-swirled fluid, breaking up the tiny flocs entrained in the liquid phase into finer particles, while further enhancing the turbulence of the flow field, providing a better initial flow state for subsequent mixing with the gas phase. This design of deflection angle and raised texture allows the liquid fluid to undergo a pre-treatment process of guidance and interception, pre-swirling turbulence, and shearing and breaking as it passes through the water inlet pipe, effectively improving the basic conditions for subsequent gas-liquid mixing.

[0023] Example 2 like Figure 4As shown, the air intake pipe 2 is positioned close to the water intake pipe 1. The inner wall of the air intake pipe 2 is uniformly connected axially with a first guide cloud soft ring 21, a second guide cloud soft ring 22, and a third guide cloud soft ring 23. Each soft ring has a 120° notch, and the phase difference between the notches of adjacent soft rings is 120°. The first guide cloud soft ring 21, the second guide cloud soft ring 22, and the third guide cloud soft ring 23 are arranged in a stepped pattern with diameters of "large-small-large" along the axial direction of the air intake pipe 2. The 120° phase difference between the notches of adjacent soft rings creates a three-dimensional interlaced turbulent flow channel within the pipe, preventing the airflow from flowing in a straight line in a single direction. When the air flows through the second guide cloud soft ring 22 with the smallest diameter, the flow channel cross-section contracts, generating a Venturi effect. The airflow velocity instantly increases, forming a high-speed jet that impacts the pipe wall and generates radial diffusion. Simultaneously, the wave of the guide cloud soft ring... The textured structure causes periodic vortex disturbances in the airflow during axial propulsion, breaking large volumes of air into clusters of tiny bubbles. When the airflow passes through the third guide cloud soft ring 23 with an increased diameter, the expansion of the flow channel cross-section leads to a decrease in pressure, further promoting secondary dispersion and homogenization of the bubbles. This differentiated layout not only achieves air pre-dispersion and turbulence enhancement, but also regulates the dynamic distribution of airflow through the alternating contraction and expansion of the flow channel, so that the gas phase entering the extrusion mixing chamber 3 has a uniform microbubble morphology, providing good initial conditions for subsequent efficient shearing and effectively improving the mixing efficiency of the gas and liquid phases in the extrusion mixing chamber 3.

[0024] Example 3 like Figure 5 As shown, the inner wall of the extrusion mixing chamber 3 is sequentially connected along its axial direction by connecting units to a first segmented textured extrusion ball bowl 4, a second segmented extrusion ball bowl 5, and a third segmented extrusion ball bowl 6. Each of these three segments is connected to three connecting units evenly arranged circumferentially along the inner wall of the extrusion mixing chamber 3. Each segmented textured extrusion ball bowl consists of three segments, and each segment is staggered with the others.

[0025] like Figure 6As shown, the connecting unit includes a bottom bolt rod 46. One end of the bottom bolt rod 46 is connected to the connecting nut 32 and the extrusion mixing chamber 3 via a connecting washer 31. The other end of the bottom bolt rod 46 is connected to a spring sleeve 44. One end of the spring sleeve 44 is connected to a spring 45, and the other end of the spring 45 is connected to a sealing baffle 43. The size of the sealing baffle 43 matches the inner wall of the spring sleeve 44. Multiple sealing baffles 43 are connected one-to-one to primary segmented ball cups 42, secondary segmented ball cups 52, and tertiary segmented ball cups 62. The first segmented textured extrusion ball cup 4 includes three circumferentially distributed primary segmented ball cups 42, the second segmented extrusion ball cup 5 includes three circumferentially distributed secondary segmented ball cups 52, and the third segmented extrusion ball cup 6 includes three circumferentially distributed tertiary segmented ball cups 62. The sealing baffle 43 and the spring 45 are both disposed inside the spring sleeve 44. The sealing baffle 43 prevents fluid from seeping into the spring sleeve 44, ensuring that the life of the spring 45 is not affected. The bottom of the extrusion ball bowl is equipped with two bottom bolt rods 46, which are firmly bolted to the extrusion mixing chamber 3. This connection method not only ensures the positional stability of the extrusion ball bowl during operation and can withstand the impact of high-speed fluid without displacement or loosening, but also facilitates disassembly and installation when maintenance or replacement of the extrusion balls is required, thus improving the ease of equipment maintenance.

[0026] like Figure 7-9As shown, the first-stage segmented spherical bowl 42 has uniformly distributed triangular pyramidal protrusions 41, which perform preliminary piercing and shearing on the incoming gas-liquid two-phase fluid, breaking up large-sized bubbles and dispersing flocs in the liquid phase. The second-stage segmented spherical bowl 52 has several uniformly connected conical protrusions 51. Its conical structure can perform secondary compression on the gas-liquid two-phase fluid after preliminary shearing, further refining the bubbles. At the same time, the streamlined design of the conical surface reduces fluid resistance and improves the mixing flow efficiency. The third-stage segmented spherical bowl 62 has several uniformly connected quadrangular pyramidal protrusions 61. The quadrangular pyramidal protrusions have multiple edges... The structure can create deep shearing and turbulent disturbances in the gas-liquid two-phase fluid. Simultaneously, the layout of the four-sided pyramidal convex texture 61 further enhances the collision frequency and contact area of ​​the gas-liquid two-phase fluid, strengthening the mixing uniformity. When the gas-liquid two-phase fluid flows through the segmented textured extrusion bowls, the impact of the gas-liquid-solid multiphase fluid on each segmented bowl causes the spring 45 to deform accordingly. The spring, subjected to the extrusion force transmitted from each segmented bowl and its own elastic force, drives the extrusion bowls to perform periodic reciprocating motion, producing a multi-dimensional cutting and extrusion effect on the flowing mixed fluid. The periodic opening and closing of the segmented textured extrusion bowls generates a strong jet and entrainment effect. When the gaps in each segmented bowl expand due to fluid impact, the pressure within the gaps decreases, and external fluid is rapidly entrained into the gaps. When the gaps in each segmented bowl shrink due to the elastic force of the spring 45, the multiphase fluid is violently compressed, forming a high-speed jet that is ejected outwards. This reciprocating motion disrupts the fluid's steady state, allowing the gas and wastewater to mix more rapidly. The raised texture on the segmented spherical bowls, accompanying the opening and closing of the bowls, exerts a squeezing and shearing effect on the fluid, further deepening the mixing of the gas-liquid-solid multiphase fluid. Simultaneously, the opening and closing of the spherical bowls generates a large amount of turbulence and vortices in the fluid, especially at the edge of the bowls. Due to the sudden expansion or contraction of the flow channel, boundary layer separation occurs, forming periodic vortex rings, which makes the gas-liquid mixing more uniform and thorough.

[0027] When the gas-liquid-solid multiphase fluid reaches the extrusion mixing chamber 3, the ball-shaped cups are compressed and undergo radial contraction. At this time, the spring 45 is compressed and stores elastic potential energy, while simultaneously applying a reverse thrust to the ball-shaped cups to ensure that the contact surface between the ball-shaped cups and the gas-liquid two-phase fluid maintains a stable pressure, promoting full mixing and mass transfer of the gas-liquid two-phase fluid. The spring 45 releases the stored potential energy, pushing the ball-shaped cups of each stage to reset. Under the action of elastic force, they return to their original shape, forming a reverse extrusion on the multiphase mixing flow space, causing the mixed gas-liquid medium to be discharged and begin the next cycle. Through the extension and retraction characteristics of the spring 45, the ball-shaped cups of each stage realize the periodic extrusion and release action of the gas-containing wastewater, effectively enhancing the phase interface disturbance, improving the mass transfer efficiency, and at the same time giving the extrusion ball a certain elastic buffering capacity. When the mixed flow contains a small amount of small impurities that are not completely intercepted or when there are instantaneous fluctuations in the flow rate, the spring 45 can adapt through its own deformation, avoiding structural damage caused by rigid collisions, and maintaining the pressure stability in the flow channel to a certain extent. When the gas-liquid two-phase fluid flows through the first segmented textured extrusion bowl 4, the high-speed fluid impacts the surface of the triangular pyramidal convex texture 41 of the three-lobed first-stage segmented bowl 42, splitting it into three streams. Subsequently, a local low-pressure vortex is formed in the region behind the bowl, promoting the initial breakup and dispersion of bubbles. After entering the second segmented extrusion bowl 5, the conical convex texture 51 further enhances the shearing effect, further reducing the bubble size and increasing the contact area between the gas and liquid two-phase fluids. The square pyramidal convex texture 61, based on the triangular pyramidal convex texture 41, further refines the multiphase mixed flow, promoting a more stable emulsion state between bubbles and water. Due to the arrangement of the segmented bowls at each stage and the synergistic effect of the segmented structure, the mixed flow undergoes multiple processes of splitting, converging, extrusion, and shearing, further breaking down the originally larger bubbles into smaller ones. At the same time, the contact area between the liquid and gas is significantly increased, creating favorable conditions for the subsequent oxygen transfer process. In addition, this three-stage segmented textured extrusion ball bowl design also extends the effective residence time of the gas-liquid mixture in the mixing chamber of the extrusion section, allowing the mass transfer process between gas and liquid to proceed more fully.

[0028] Example 4 like Figure 10-11As shown, both ends of the double-spinning ribbon mixing chamber 7 are connected to cross-shaped support rods 71. The intersection of the support rods 71 ​​is connected to a first end cap 71 and a second end cap 73. An angular contact ball bearing 72 is connected between the first end cap 71 and the second end cap 73. A ribbon center rod 83 is connected between the two angular contact bearings 72. The ribbon center rod 83 is coaxially connected to an outer ribbon 81 and an inner ribbon 82. The outer ribbon 81 is right-handed, and the inner ribbon 82 is left-handed. The degree of twist of the inner ribbon 82 is lower than that of the outer ribbon 81. The outer spiral ribbon 81, the inner spiral ribbon 82, and the central rod 83 of the spiral ribbon are coaxially fixed to form an inner and outer double-layer spiral ribbon 8. Both the inner spiral ribbon 82 and the outer spiral ribbon 81 are designed to twist along their own spiral direction. The width of the inner spiral ribbon 82 is greater than that of the outer spiral ribbon 81, and the pitch of the outer spiral ribbon 81 is twice that of the pitch of the inner spiral ribbon 82. The two spiral directions are opposite, which makes the gas-liquid two-phase fluid form a strong axial and radial composite flow field inside the double-spinning spiral ribbon mixing chamber 7. This unique structure allows the gas-liquid two-phase fluid to be subjected to spiral propulsion force and shear force in both the inner and outer directions at the same time. The outer spiral ribbon 81 is right-handed and twists along its own spiral direction, propelling the gas-liquid two-phase fluid towards the cavity wall in a spiral motion. The inner spiral ribbon 82 is left-handed and twists along its own spiral direction, with a lower degree of twist than the outer spiral ribbon 81, guiding the fluid to flow along the central axis. The difference in the spiral direction, pitch, and degree of twist along their own spirals between the inner and outer spiral ribbons 82 and 81 creates a composite flow field in the radial and axial directions, resulting in strong shearing, entrainment, and mixing effects of the gas-liquid-solid multiphase fluid within the cavity. When the multiphase flow enters the double-spinning spiral ribbon mixing chamber 7 from the extrusion section mixing chamber 3, the rotation of the inner and outer double-layer spiral ribbons 8 creates alternating velocity gradients in the circumferential and axial directions of the mixed flow. Bubbles are repeatedly cut and uniformly dispersed in the liquid phase, while the turbulence intensity of the fluid is further enhanced. The angular contact ball bearing 72 can withstand the radial and axial loads generated by the spiral ribbon rotation. Combined with the rigid support of the support rod 71, it effectively suppresses the vibration and offset of the inner and outer double-layer spiral ribbons 8, ensuring stable operation of the mixing system.

[0029] Example 5 like Figure 12-14As shown, one end of the double-spinning ribbon mixing chamber 7 is connected to a second connecting flange 75, and the end of the extrusion mixing chamber 3 is connected to a first connecting flange 33. A first flange gasket 34 is provided between the second connecting flange 75 and the first connecting flange 33. The first connecting flange 33 is connected to the second connecting flange 75. The other end of the double-spinning ribbon mixing chamber 7 is connected to a third connecting flange 76, and the end of the accelerating conical tube 9 is connected to a fourth connecting flange 91. A second flange gasket 77 is provided between the third connecting flange 76 and the fourth connecting flange 91. The third connecting flange 76 is connected to the fourth connecting flange 91. The interior of the jet aerator is an environment of high-speed turbulence and intense gas-liquid impact, which will generate significant vibration and pressure pulses. The flange connection, fastened with evenly distributed multiple bolts, provides a rigid and reliable connection, effectively resisting these dynamic loads, preventing the connection points from loosening or failing due to fatigue, and ensuring the overall structural integrity. A sealing gasket is installed between the flange faces to achieve a reliable seal under high flow rate and high pressure working conditions, preventing sewage and air leakage, ensuring the stability of the jet velocity at the nozzle and the negative pressure strength of the intake chamber, which is the basis for maintaining a high oxygen transfer rate and a stable intake air volume.

[0030] like Figure 15 As shown, the inlet diameter of the accelerating conical tube 9 is larger than the outlet diameter, causing the gas-liquid two-phase fluid to continuously increase in velocity as the flow cross-sectional area gradually decreases, forming a high-speed jet. The high-speed flowing gas-liquid two-phase fluid generates strong inertial force within the conical tube, providing sufficient velocity for subsequent gas-liquid two-phase fluid entering the nozzle, while simultaneously enhancing the relative motion between the gas and liquid phases, promoting oxygen transfer from the bubbles to the water. The tapered design of the accelerating conical tube 9 is 1:2.3, ensuring effective velocity enhancement while avoiding cavitation caused by excessively high local velocities, thus stably delivering the gas-liquid mixture to the biomimetic castor bean capsule's six-pronged rotating nozzle 10 at optimal speed and condition.

[0031] Example 6 like Figure 16-17As shown, the six-pronged rotary nozzle 10 includes a nozzle connecting threaded pipe 101, which is threadedly connected to an accelerating conical tube 9. A bearing sealing housing 102 is connected to the side of the nozzle connecting threaded pipe 101 away from the accelerating conical tube 9 via several circumferentially arranged first bolts 92. A double-row tapered roller bearing 106 is connected back-to-back within the bearing sealing housing 102. First positioning elements 105 and second positioning elements 108 are respectively connected to both ends of the bearing sealing housing 102 to axially position the double-row tapered roller bearing 106, ensuring the stable and reliable operation of the six-pronged rotary nozzle 10. A first sealing washer 103 is provided between the first positioning element 105 and the bearing sealing housing 102, and the second positioning element 108 is connected to the bearing sealing housing 102. A second sealing gasket 107 is provided between the bearing sealing housings 102. A connecting cylinder 112 is connected to the side of the bearing sealing housing 102 away from the nozzle connecting threaded pipe 101 by several circumferentially arranged second bolts 104 passing through the first positioning member 105. Six three-hole nozzles 109 are evenly connected circumferentially to the connecting cylinder 112. A hemispherical cavity 110 is connected to the side of the connecting cylinder 112 away from the bearing sealing housing 102. A second positioning member 108 is provided between the bearing sealing housing 102 and the hemispherical cavity 110. Several frustum nozzles 111 are evenly connected to the surface of the hemispherical cavity 110. A cross groove is opened at the end of each frustum nozzle 111. The connecting cylinder 112 is connected to the inner ring of the tapered roller bearing 106 to ensure its high-speed smooth operation. The tapered structure of the frustum nozzle 111 causes the mixed flow to form a contracting jet at the outlet, increasing the jet's kinetic energy. The cross grooves on the inner wall divide the jet into four micro-jet streams. The biomimetic design of a castor bean capsule enhances the radial diffusion capability of the jet, preventing it from becoming too concentrated. After the jet enters the water body, a local negative pressure zone is formed between the four micro-jet streams, entraining surrounding wastewater to participate in the mixing and further expanding the gas-liquid contact area. At the same time, the tapered design of the frustum nozzle 111 allows the jet to form a longer effective diffusion path in the water body, extending the gas-liquid mass transfer time. In addition, the back-to-back tapered roller bearings 106 inside the bearing sealing housing 102 allow the connecting cylinder 112 to drive the three-hole nozzle 109 to rotate continuously and rapidly under the reaction force of the multiphase mixed jet, preventing local oxygen saturation in the water body and improving the overall oxygen transfer uniformity. This structural design enhances the diffusion effect of the jet by incorporating the six-pronged rotating nozzle 10 of the biomimetic castor bean capsule, while also optimizing the oxygen distribution in the water through adaptive rotation, ultimately achieving a highly efficient gas-liquid mass transfer and oxygen transfer process. After the gas-liquid-solid multiphase fluid's velocity is increased by the accelerating conical tube 9, it passes through the nozzle connecting threaded tube 101 and the bearing sealing housing 102, entering six three-hole nozzles 109 and a hemispherical cavity 110. The fluid is ejected from the circular holes of the three-hole nozzles 109, and simultaneously converges in the hemispherical cavity 110 before being sprayed out at high speed by the frustum-shaped nozzle 111.

[0032] Six three-hole nozzles 109 are evenly distributed at 60°. Each three-hole nozzle 109 has three circular nozzles at a downward 45° angle. This layout allows the nozzle to rotate as a whole by utilizing the reaction torque generated by the fluid jet when the gas-liquid fluid passes through. To ensure the stability and smoothness of the rotation process, tapered roller bearings 106 are integrated into the nozzle assembly structure and mounted back to back. The tapered roller bearings 106 mainly bear the radial load of the nozzle on the axial impact load of the gas-liquid-solid mixture. Through the line contact characteristics between the roller and the raceway, the radial force brought by the fluid impact is effectively dispersed, reducing the radial runout during rotation. This structure allows some of the multiphase mixed fluid to be sprayed downward and to the side at an inclined angle, forming a radially diffused jet. This effectively expands the stirring range of the surrounding water, promotes the overall circulation of the fluid in the pool, and ensures that the sprayed mixed flow can form sufficient penetration force while avoiding excessive local disturbance caused by excessive energy concentration.

[0033] like Figure 18 As shown, the hexagonal rotating nozzle 10 has a hemispherical cavity 110 at its end. Its outer surface is biomimetic to a castor bean capsule, with three layers of frustum nozzles 111 arranged around it, each with a cross-shaped groove. This biomimetic castor bean capsule design allows the jet to diffuse in multiple directions. Combined with the rotational motion, this significantly increases the coverage area of ​​the aeration zone, avoiding the dead zone problem common with fixed nozzles. This results in a more uniform distribution of dissolved oxygen in the wastewater, promoting the biochemical reactions of microorganisms and the degradation of organic pollutants. The natural structure of the castor bean capsule has excellent flow guiding characteristics, and the biomimetic frustum nozzles 111 make the flow path of the mixed flow smoother, reducing energy loss. The cross-shaped grooves divide the nozzle outlet into four fan-shaped regions. When the high-speed gas-liquid mixture enters the hemispherical cavity 110, it forms a brief swirling buffer within the cavity, and is then further divided into finer jets by the cross-shaped grooves on the biomimetic castor bean capsule nozzles. The cross groove not only increases the contact area and shearing effect between the gas-liquid mixture and the nozzle wall, but also forms a micro-vortex structure on the surface of the jet, causing the bubbles to break up again after being ejected, significantly improving the dispersion and surface area of ​​the bubbles. Furthermore, the opening width of the cross groove can be adjusted appropriately according to specific working conditions to control the flow rate and velocity.

[0034] Example 7 The jet aeration method of the multi-stage extrusion spiral mixing jet aerator is implemented according to the following steps: Step 1: Place the jet aerator in the wastewater environment of the aerobic section, and connect the inlet pipe 1 to the circulation pump; Step 2: Wastewater is pretreated by three alternating barbed grids in the inlet pipe 1, and then mixed with air that has been treated by three-stage guide cloud soft rings in the air inlet pipe 2 in the compression mixing chamber 3. Step 3: The gas-liquid-solid mixture enters the double-spinning ribbon mixing chamber 7 through the three-stage segmented textured extrusion ball bowl in the extrusion mixing chamber 3; Step 4: The gas-liquid mixture that has passed through the double-spinning spiral mixing chamber 7 flows through the accelerating conical tube 9 and is finally ejected from the round hole of the three-hole nozzle 109 and the frustum nozzle 111.

[0035] The working principle of the multi-stage extrusion spiral mixing jet aerator of the present invention is as follows: The jet aerator is placed in the wastewater environment of the aerobic section. Different air inlet pipes 2 are selected according to the wastewater level. The water inlet pipe 1 is connected to the circulation pump. Wastewater is pumped into the jet aerator by the circulation pump and flows in through the water inlet pipe 1. It is pretreated by three alternating spiky grids. The first spiky grid 11 guides the flow and intercepts and breaks down large particles of impurities through spiky diversion slices. The sharp edges at the center of the grid holes can pierce suspended flocs and prevent subsequent flow channel blockage. The second spiky grid 12 is offset from the first spiky grid 11 at 45° in its circumferential direction, forming a local vortex in the flow field, which makes the liquid fluid generate a pre-swirling flow state and enhances the turbulence intensity. The third spiky grid 13 further increases the flow velocity through the decreasing number of holes. Its sharp grid edges shear the pre-swirling fluid and break the small flocs into finer particles. At the same time, the progressive disturbance of the three-stage grid makes the fluid form an anisotropic turbulent field, providing ideal initial conditions for gas-liquid mixing. Meanwhile, the external air supplied by the blower is processed by three stages of gradually changing diameter guide cloud soft rings inside the intake pipe 2. The first guide cloud soft ring 21 guides the airflow to be evenly distributed. The second guide cloud soft ring 22 generates a Venturi effect through flow channel contraction, forming a high-speed jet that impacts the pipe wall and generates radial diffusion. Combined with the phase difference notch design, a three-dimensional spiral airflow is formed. The third guide cloud soft ring 23 expands the flow channel cross-section, promoting secondary bubble breakage, and finally forming a uniform microbubble cluster that is injected into the extrusion section mixing chamber. The gas-liquid-solid multiphase flow completes enhanced mixing in the extrusion mixing chamber 3. The triangular pyramidal protrusion texture 41 of the first-stage segmented spherical bowl 42 punctures and shears the gas-liquid two-phase fluid, breaking up large bubbles. The conical protrusion texture 51 of the second-stage segmented spherical bowl 52 reduces flow resistance through streamlined surfaces, achieving secondary bubble refinement. The three-tiered, segmented spherical bowl 62 has a pyramidal protrusion 61 forming a multi-faceted shear surface. Driven by a spring 45 at the bottom, it periodically opens and closes, generating an "expansion-contraction" jet effect. When the bowl opens due to fluid impact, the local pressure decreases, entraining surrounding fluid. When it closes, a high-speed jet is formed, ultimately refining the bubbles. Subsequently, the gas-liquid two-phase fluid enters the dual-spinning spiral ribbon mixing chamber 7. The right-handed outer spiral ribbon 81, twisted along its own spiral direction, and the left-handed inner spiral ribbon 82 form a radial and axial composite flow field. The velocity difference between the inner and outer double spiral ribbons 8 exerts a shearing and stretching effect on the bubbles, increasing the dissolved oxygen in the wastewater.When the multiphase mixture passes through the accelerating conical tube 9, the flow velocity increases under the action of the diameter-contracting structure, and finally enters the six-pronged rotating nozzle 10 of the biomimetic castor bean capsule. The hemispherical cavity 110 is a near-spherical shape that mimics the shape of a castor bean capsule, with a streamlined transition in the internal cavity, resulting in low fluid resistance, stable flow velocity, and less fouling. Several frustum nozzles 111 with cross grooves are evenly distributed on the hemispherical cavity 110. The nozzles radiate in multiple directions and at equal angles along the hemispherical cavity, mimicking the multidirectional seed output of the castor bean capsule, achieving 360° full coverage without spray dead angles. The cross grooves on the inner wall divide the jet into multiple micro-jet streams, forming an umbrella-shaped flow field at the outlet. Furthermore, the six-pronged rotating nozzle 10 has a symmetrical structure that mimics the shape of a castor bean capsule, resulting in uniform force distribution, good vibration resistance, stable operation, and longer service life. After the jet enters the sewage body, a local negative pressure zone is formed between the cross jets, which entrains the surrounding water to participate in the mixing. The frustum nozzle 111 expands the jet coverage area, avoids local oxygen saturation, and ultimately achieves efficient oxygen transfer.

[0036] This invention relates to a multi-stage extrusion spiral mixing jet aerator, which can coordinate multiple mixing methods and simultaneously refine bubble clusters and accelerate oxygen transfer, thereby comprehensively improving the overall efficiency of wastewater treatment systems and solving the problems of poor mixing effect and low oxygen transfer rate of current jet aerators.

Claims

1. A multi-stage extrusion spiral mixing jet aerator, characterized in that, It includes an extrusion mixing chamber (3), one end of which is connected to a water inlet pipe (1), and the side wall of the extrusion mixing chamber (3) is connected to an air inlet pipe (2). The end of the extrusion mixing chamber (3) away from the water inlet pipe (1) is connected to a double-spinning spiral ribbon stirring mixing chamber (7). The end of the double-spinning spiral ribbon stirring mixing chamber (7) away from the extrusion mixing chamber (3) is connected to an accelerating conical tube (9). The end of the accelerating conical tube (9) away from the double-spinning spiral ribbon stirring mixing chamber (7) is connected to a six-pronged rotating nozzle (10). The inner wall of the extrusion mixing chamber (3) is connected in sequence along its axial direction by a connecting unit to a first segmented textured extrusion ball bowl (4), a second segmented textured extrusion ball bowl (5), and a third segmented textured extrusion ball bowl (6). The first segmented textured extrusion ball bowl (4), the second segmented textured extrusion ball bowl (5), and the third segmented textured extrusion ball bowl (6) are all connected to three connecting units that are uniformly arranged along the circumference of the inner wall of the extrusion mixing chamber (3). The connecting unit includes a bottom bolt rod (46), one end of which is connected to the connecting nut (32) and the extrusion mixing chamber (3) via a connecting washer (31). The other end of the bottom bolt rod (46) is connected to a spring sleeve (44), one end of which is connected to a spring (45), and the other end of which is connected to a sealing baffle (43). The size of the sealing baffle (43) matches the inner wall of the spring sleeve (44). Multiple sealing baffles (43) are connected one-to-one to a primary split ball cup (42), a secondary split ball cup (52), and a tertiary split ball cup (62). The first-level segmented ball bowl (42) is uniformly connected with several triangular pyramidal protrusions (41), the second-level segmented ball bowl (52) is uniformly connected with several conical protrusions (51), and the third-level segmented ball bowl (62) is uniformly connected with several quadrangular pyramidal protrusions (61).

2. The multi-stage extrusion spiral mixing jet aerator according to claim 1, characterized in that, The water inlet pipe (1) has a frustum-shaped structure. The smaller end of the water inlet pipe (1) is connected to the extrusion mixing chamber (3). The inner wall of the water inlet pipe (1) is uniformly connected with a first spiky grid (11), a second spiky grid (12) and a third spiky grid (13) along its axial direction. The first spiky grid (11), the second spiky grid (12) and the third spiky grid (13) are arranged alternately at ±20° along the axial direction of the water inlet pipe (1). The first spiky grid (11) is uniformly provided with 21 spiky grid holes, the second spiky grid (12) is uniformly provided with 16 spiky grid holes, and the third spiky grid (13) is uniformly provided with 11 spiky grid holes.

3. The multi-stage extrusion spiral mixing jet aerator according to claim 1, characterized in that, The air inlet pipe (2) is located close to the water inlet pipe (1). The inner wall of the air inlet pipe (2) is uniformly connected with a first guide cloud soft ring (21), a second guide cloud soft ring (22) and a third guide cloud soft ring (23) along its axial direction. Each soft ring has a 120° notch, and the phase difference between the notches of adjacent soft rings is 120°.

4. The multi-stage extrusion spiral mixing jet aerator according to claim 1, characterized in that, The double-spinning ribbon mixing chamber (7) is connected to two cross-shaped support rods (71) at both ends. A first end cap (73) and a second end cap (74) are connected at the intersection of the support rods (71). An angular contact ball bearing (72) is connected between the first end cap (73) and the second end cap (74). A ribbon center rod (83) is connected between the two angular contact ball bearings (72). The ribbon center rod (83) is coaxially connected to an outer ribbon (81) and an inner ribbon (82). The outer ribbon (81) is right-handed and the inner ribbon (82) is left-handed. The degree of twist of the inner ribbon (82) is lower than that of the outer ribbon (81).

5. The multi-stage extrusion spiral mixing jet aerator according to claim 1, characterized in that, One end of the dual-spinning ribbon mixing chamber (7) is connected to a second connecting flange (75), and the end of the extrusion mixing chamber (3) is connected to a first connecting flange (33). A first flange gasket (34) is provided between the second connecting flange (75) and the first connecting flange (33). The first connecting flange (33) is connected to the second connecting flange (75). The other end of the dual-spinning ribbon mixing chamber (7) is connected to a third connecting flange (76). The end of the accelerating conical tube (9) is connected to a fourth connecting flange (91). A second flange gasket (77) is provided between the third connecting flange (76) and the fourth connecting flange (91). The third connecting flange (76) is connected to the fourth connecting flange (91).

6. The multi-stage extrusion spiral mixing jet aerator according to claim 1, characterized in that, The six-pronged rotary nozzle (10) includes a nozzle connecting threaded tube (101), which is threadedly connected to an accelerating tapered tube (9). A bearing sealing housing is connected to the side of the nozzle connecting threaded tube (101) away from the accelerating tapered tube (9) via several circumferentially arranged first bolts (92). A double-row tapered roller bearing (106) is connected inside the bearing sealing housing, mounted back-to-back. A first positioning element (105) and a second positioning element (108) are respectively connected to both ends of the bearing sealing housing. A first sealing washer (103) is provided between the first positioning element (105) and the bearing sealing housing. A second sealing gasket (107) is provided between the second positioning component (108) and the bearing sealing housing. The bearing sealing housing is connected to a connecting cylinder (112) through the first positioning component (105) by several circumferentially arranged second bolts (104) on the side away from the nozzle connecting threaded pipe (101). The connecting cylinder (112) is circumferentially connected with six three-hole nozzles (109). The connecting cylinder (112) is connected to a hemispherical cavity (110) on the side away from the bearing sealing housing. The surface of the hemispherical cavity (110) is uniformly connected with several frustum nozzles (111). Each frustum nozzle (111) has a cross groove at its end.

7. The jet aeration method of the multi-stage extrusion spiral mixing jet aerator according to any one of claims 1-6, characterized in that, The specific steps are as follows: Step 1: Place the jet aerator in the wastewater environment of the aerobic section, and connect the inlet pipe (1) to the circulating pump; Step 2: Wastewater is pretreated by three alternating barbed grids in the inlet pipe (1), and then mixed with air that has been treated by three-stage guide cloud soft rings in the air inlet pipe (2) in the compression mixing chamber (3). Step 3: The gas-liquid-solid mixture enters the double-spinning ribbon mixing chamber (7) through the three-stage segmented textured extrusion ball bowl in the extrusion mixing chamber (3); Step 4: The gas-liquid mixture that has passed through the double-spinning spiral mixing chamber (7) flows through the accelerating conical tube (9) and is finally ejected from the round hole and the frustum nozzle (111) of the three-hole nozzle (109).

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