A top air inlet type two-stage diffusion rotational flow aerator

Abstract

The utility model belongs to sewage treatment aerator technical field especially relates to a top air inlet formula two -stage diffusion cyclone aerator, including cylinder and air inlet pipe, the lower end of cylinder is connected with the fairing, the bottom of fairing is open and it is equipped with a plurality of cyclone nozzles in it, the upper fixed connection of cylinder is provided with the diffuser, the diffuser and cylinder interval setting form the spray outlet that supplies the mixed fluid of cylinder inside to spray, the outer edge of diffuser is zigzag to cut the mixed fluid that sprays, air inlet pipe from top to bottom passes through diffuser and cylinder and links to all cyclone nozzles in turn. The aerator of the utility model not only can avoid the radial unbalanced force caused by side air inlet, prolongs structural fatigue life, and can cut the bubble fully as dense small bubble, improves oxygen transfer efficiency, can increase sludge diffusion area, prolongs oxygen residence time, reduces the installation quantity of aerator, reduces the power consumption of fan.

Description

Technical Field

[0001] This utility model belongs to the technical field of wastewater treatment aerators, and particularly relates to a top-inlet type two-stage diffusion swirl aerator. Background Technology

[0002] In wastewater treatment, aeration technology is one of the core processes. It introduces oxygen into the wastewater to maintain the metabolic activities of aerobic microorganisms, thereby degrading organic pollutants. As a highly efficient gas-liquid mixing device, the cyclone aerator, with its unique cyclone structure design, can create a negative pressure suction effect during the gas-liquid two-phase flow, drawing the wastewater and sludge mixture from the bottom of the tank into the mainstream zone, forming a gas-liquid-solid three-phase circulating flow system, significantly improving oxygen mass transfer efficiency. However, existing cyclone aerator technology still faces the following key technical bottlenecks in practical applications, restricting its performance optimization and energy consumption control:

[0003] (1) Insufficient mechanical stability due to lateral air intake structure: Most existing swirl aerators adopt a lateral air intake method, in which gas enters the swirl chamber radially from the side wall of the cylinder. This design causes the aerator to be subjected to asymmetric aerodynamic loads, generating periodic deflection torque under the impact of high-speed airflow. During long-term operation, the flange sealing surface is prone to leakage due to alternating stress, and the connecting parts (such as bolts and brackets) may fail due to fatigue fracture.

[0004] (2) Larger bubble diameter reduces oxygen transfer efficiency: The gas-liquid mixing process of existing cyclone aerators mainly relies on a single cyclone shear force, resulting in the average diameter of the generated bubbles being concentrated in the range of 3-5 mm. According to the two-film theory, bubble size is negatively correlated with oxygen mass transfer coefficient. Larger bubbles have a smaller specific surface area and a faster rising speed, making it difficult for them to fully contact the wastewater to complete oxygen transfer.

[0005] (3) Top-outlet flow field design shortens oxygen residence time: In existing swirl aerators, the mixed fluid is sprayed vertically from the top of the cylinder, forming a unidirectional jet flow field. This design results in insufficient oxygen residence time in the wastewater, with some unused oxygen escaping quickly from the liquid surface with the bubbles. At the same time, due to the small diameter of the aerator cylinder and the small sludge-water diffusion area, the number of aerators needs to be increased to improve sludge-water mixing efficiency and prevent the formation of sludge deposition dead zones.

[0006] Therefore, the inventors dedicated themselves to designing an aerator to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to provide a top-inlet dual-stage diffusion vortex aerator, which not only avoids radial imbalance forces caused by side air intake and extends the fatigue life of the structure, but also fully cuts the bubbles into dense small bubbles, improving oxygen transfer efficiency. At the same time, it can also increase the mud-water diffusion area, extend the oxygen residence time, reduce the number of aerators installed, and reduce the power consumption of the blower.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] A top-inlet dual-stage diffusion swirl aerator includes a cylinder and an inlet pipe. The lower end of the cylinder is connected to a flow guide hood, the bottom of which is open and has multiple swirl nozzles inside. A diffuser hood is fixedly connected to the top of the cylinder. The diffuser hood and the cylinder are spaced apart to form an outlet for spraying out the mixed fluid inside the cylinder. The outer edge of the diffuser hood is serrated to cut the sprayed mixed fluid. The inlet pipe passes through the diffuser hood and the cylinder sequentially from top to bottom and is connected to all the swirl nozzles.

[0010] As an improvement of the top-inlet dual-stage diffusion swirl aerator of this utility model, the diffuser is fixedly sleeved on the air inlet pipe, and the middle part of the diffuser protrudes to one side of the cylinder to form a funnel shape.

[0011] As an improvement of the top-inlet dual-stage diffusion swirl aerator of this utility model, the diffuser includes a cover body and a cutting ring. The cover body is funnel-shaped and sleeved on the air inlet pipe. The cutting ring is fixedly sleeved at the top opening edge of the cover body. The outer edge of the cutting ring is provided with a ring of sharp teeth at intervals to form a serrated shape.

[0012] As an improvement of the top-inlet dual-stage diffusion swirl aerator of this utility model, the diffuser is fixedly connected to the top surface of the cylinder through a fixing frame, and the diffuser, the air inlet pipe and the fixing frame are all coaxially arranged with the cylinder.

[0013] As an improvement of the top-inlet dual-stage diffusion swirl aerator of this utility model, the fixing frame includes two fixing rings and multiple support rods. One of the fixing rings is fixed to the bottom of the diffuser and sleeved on the air inlet pipe, and the other fixing ring is sleeved at the top opening of the cylinder. The two fixing rings are connected by all the support rods.

[0014] As an improvement of the top-inlet dual-stage diffusion swirl aerator of this utility model, each of the support rods is inclined, and all the support rods are arranged in a circle around the air inlet pipe at intervals.

[0015] As an improvement of the top-inlet dual-stage diffusion swirl aerator of this utility model, the cutting diameter of the diffuser hood is larger than the diameter of the cylinder.

[0016] As an improvement of the top-inlet dual-stage diffusion swirl aerator of this utility model, the cylinder is cylindrical, and the inner wall of the cylinder is provided with multiple layers of turbulence generators, with the same layer of turbulence generators arranged in a ring around the air inlet pipe at intervals.

[0017] As an improvement of the top-inlet dual-stage diffusion swirl aerator of this utility model, all the swirl nozzles are arranged in a dispersed manner around the air inlet pipe and spray in the same direction. Each of the swirl nozzles rises along the inner wall of the guide shroud in a spiral path.

[0018] As an improvement of the top-inlet dual-stage diffusion swirl aerator of this utility model, the bottom of the inlet pipe is connected to all the swirl nozzles through a diverter pipe, and the diverter pipe is arranged radially along the guide shroud.

[0019] Compared with existing technologies, the top-inlet dual-stage diffusion swirl aerator of this utility model utilizes an air inlet pipe that passes through the diffuser and cylinder sequentially from top to bottom and connects to all swirl nozzles. This vertical air inlet avoids radial imbalance forces caused by side air inlet, resulting in only axial micro-vibration during aeration and effectively extending the structural fatigue life. By installing a guide hood at the lower end of the cylinder, with swirl nozzles inside, and a diffuser fixedly connected above the cylinder, a dual-stage diffusion swirl structure is formed, allowing air entering from the air inlet pipe to first pass through the swirl... The nozzle rotates to expel air, stirring the sludge and wastewater. The resulting mixed fluid rotates and rises into the cylinder within the guide hood, where it is then cut by the serrated edge of the diffuser before finally being ejected. This process not only effectively cuts the air bubbles into dense small bubbles, extending the contact time between the bubbles and the wastewater, but also ensures that the air, water, and sludge are thoroughly cut and mixed, effectively improving oxygen transfer efficiency and significantly extending the service life of the aerator. Furthermore, it increases the sludge-water diffusion area, prolongs the oxygen residence time, reduces the number of aerators required, and lowers the power consumption of the blower. Attached image description:

[0020] Figure 1 This is a perspective view of the top-inlet dual-stage diffusion swirl aerator of this utility model;

[0021] Figure 2 This is another perspective view of the top-inlet dual-stage diffusion swirl aerator of this utility model;

[0022] Figure 3 This is a cross-sectional view of the top-inlet dual-stage diffusion swirl aerator of this utility model;

[0023] Figure 4This is a perspective view of the diffuser and the mounting bracket in this utility model;

[0024] Figure 5 This is a perspective view of the diffuser, air intake pipe, and swirl nozzle in this utility model.

[0025] Illustration:

[0026] 1. Cylinder body; 11. Flow guide; 12. First fixing ring; 13. Second fixing ring; 14. Support rod; 15. Fixing frame; 2. Diffuser; 21. Cover body; 22. Cutting ring; 221. Teeth; 3. Inlet pipe; 31. Diverter pipe; 4. Swirl nozzle; 41. Swirl nozzle; 5. Turbulence generator; 51. Nozzle outlet. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below with reference to the accompanying drawings. The drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of this utility model.

[0028] Reference Figures 1 to 5 A top-inlet dual-stage diffusion swirl aerator includes a cylinder 1, an air inlet pipe 3, a flow guide 11, and a diffuser 2. The flow guide 11 is located at the lower end of the cylinder 1, with an open bottom and multiple swirl nozzles 4 inside. The diffuser 2 is fixedly located above the cylinder 1, and is spaced apart from the cylinder 1 to form an outlet 51 for spraying out the mixed fluid inside the cylinder 1. The outer edge of the diffuser 2 is serrated to cut the sprayed mixed fluid. The air inlet pipe 3 passes through the diffuser 2 and the cylinder 1 from top to bottom and is connected to all the swirl nozzles 4.

[0029] Reference Figure 2 , Figure 3 and Figure 5 The diffuser 2, the intake pipe 3, and the guide shroud 11 are all coaxially arranged with the cylinder 1. The cylinder 1 is located between the diffuser 2 and the guide shroud 11. The cylinder 1 is cylindrical and fixedly connected to the top end face of the guide shroud 11. The side wall of the guide shroud 11 is inclined to form a positive cone shape, and the side wall of the guide shroud 11 is inclined to form an inverted cone shape.

[0030] Reference Figure 2 , Figure 3 and Figure 5Preferably, there are two swirling nozzles 4. Each swirling nozzle 4 has a swirling nozzle 41 at its end. The upper end of the intake pipe 3 passes through the diffuser 2 and extends outside the diffuser 2. The bottom of the intake pipe 3 is connected to the two swirling nozzles 4 through a split pipe 31. The split pipe 31 is arranged radially along the guide shroud 11. The intake pipe 3 and the split pipe 31 are perpendicularly connected to form a T-shape. The two swirling nozzles 4 are located at the two ends of the split pipe 31, and all the swirling nozzles 4 are arranged around the intake pipe 3 in a split shape. The swirling nozzles 4 are arranged in a dispersed pattern and spray in the same direction. Each swirling nozzle 4 rises along the inner wall of the swirling guide shroud 11 in a spiral path. The spiral rise angle of the swirling nozzle 4 is 10° to 45° and the number of spiral turns is 0.25 to 0.75. In this embodiment, the spiral spray direction of all swirling nozzles 4 is consistent with the spray direction of the mixed fluid at the nozzle outlet 51 (for example, the spiral spray direction of the swirling nozzle 4 and the spray direction of the mixed fluid at the nozzle outlet 51 are both counterclockwise).

[0031] Reference Figure 3 The inner wall of the cylinder 1 is provided with multiple layers of turbulence generators 5. The same group of turbulence generators 5 are arranged in a ring around the air inlet pipe 3. The turbulence generators 5 have a special curved surface structure and are distributed in multiple layers along the circumference inside the cylinder 1. 4 to 8 layers of turbulence generators 5 can be set inside the cylinder 1, with 4 to 8 turbulence generators 5 in each layer. The turbulence generators 5 are mainly used to generate turbulence (turbulence is a complex and irregular fluid motion state, characterized by the randomness and pulsation of physical quantities such as fluid velocity and pressure in time and space).

[0032] Reference Figure 3 , Figure 4 and Figure 5 The cutting diameter of the diffuser 2 (i.e., the maximum diameter of the diffuser 2) is larger than the diameter of the cylinder 1. The diffuser 2 is fixedly sleeved on the air inlet pipe 3. The middle part of the diffuser 2 protrudes to one side of the cylinder 1 to form a funnel shape. The diffuser 2 includes a cover body 21 and a cutting ring 22. The cover body 21 is funnel-shaped and fixedly sleeved on the air inlet pipe 3. The funnel-shaped opening of the cover body 21 faces upward. The cutting ring 22 is annular and fixedly sleeved at the top opening edge of the cover body 21. A ring of sharp teeth 221 is provided at intervals on the outer edge of the cutting ring 22 to form a serrated shape.

[0033] Reference Figure 1 , Figure 3 and Figure 4The diffuser 2 is fixedly connected to the top surface of the cylinder 1 via a fixing frame 15. The fixing frame 15 is coaxially arranged with the cylinder 1. The fixing frame 15 includes two fixing rings and multiple support rods 14. The two fixing rings specifically include a first fixing ring 12 and a second fixing ring 13. The first fixing ring 12 is fixed to the bottom of the diffuser 2's cover 21 and sleeved on the air inlet pipe 3. The second fixing ring 13 is sleeved at the top opening of the cylinder 1. The first fixing ring 12 and the second fixing ring 13 are connected by all the support rods 14. Each support rod 14 is inclined and all the support rods 14 are arranged in a circle around the air inlet pipe 3 at intervals.

[0034] Reference Figures 1 to 5 The working principle of the top-inlet dual-stage diffusion swirl aerator of this utility model is as follows:

[0035] External air enters the diversion pipe 31 from the top of the air inlet pipe 3 and flows downward. After being diverted by the diversion pipe 31, it enters the two swirl nozzles 4 and is then released from the swirl nozzles 41 of the two swirl nozzles 4. It then moves in a spiral upward motion along the inner wall of the guide shroud 11, stirring and mixing the sewage and sludge. The mixture of mud, water and air is then forcefully rotated in the guide shroud 11 and enters the cylinder 1.

[0036] The mixture of mud, water and gas rotates powerfully inside the cylinder 1 and is repeatedly cut by the turbulence generator 5. When the mixture is cut by the turbulence generator 5, the special curved surface structure of the turbulence generator 5 causes a large amount of turbulence to be generated in the mixture, which further refines and mixes the mud, water and gas and enhances the oxygen transfer efficiency.

[0037] After being cut by the turbulence generator 5, the mixed fluid rotates and rises from the cylinder 1 to the nozzle 51. After impacting the diffuser 2's cover 21 at high speed, it diffuses to the serrated edge (i.e., sharp teeth 221) of the diffuser 2 under the guidance of the inclined outer wall of the cover 21. The bubbles in the mixed fluid are cut by the sharp teeth 221, forming microbubbles with smaller diameters. This increases the oxygen transfer efficiency, expands the diffusion range of the mixed fluid, expands the service area of ​​a single aerator, and prolongs the residence time of bubbles in the sewage tank, thus enhancing oxygen utilization efficiency.

[0038] The beneficial technical effects of this top-inlet dual-stage diffusion swirl aerator are as follows:

[0039] 1. The top air inlet pipe 3 of the swirl aerator forms a centrally symmetrical structure, and the airflow is evenly distributed along the central axis, avoiding the radial unbalanced force caused by side air intake. During aeration, there is only axial micro-vibration, which effectively extends the fatigue life of the structure.

[0040] 2. The high-speed impact of the swirling water against the outer wall of the protruding part of the diffuser 2 uses turbulent kinetic energy to drive the diffuser 2 to cut itself a second time, further tearing it into microbubbles with smaller diameters, thus increasing oxygen transfer efficiency.

[0041] 3. After being cut and guided by the diffuser 2, the bubbles increase the diffusion range, thereby increasing the service area of ​​the aerator and reducing the number of aerators required. At the same time, the diffuser 2 prolongs the residence time of the bubbles in the sewage tank, allowing the bubbles to come into full contact with the sewage in the tank more efficiently and evenly, saving the aeration volume and energy consumption of the aeration system.

[0042] This utility model discloses a top-inlet dual-stage diffusion swirl aerator. The inlet pipe 3 passes sequentially from top to bottom through the diffuser hood 2 and the cylinder 1, connecting to all the swirl nozzles 4. This vertical air intake avoids radial imbalance forces caused by side air intake, resulting in only axial micro-vibration during aeration, effectively extending the structural fatigue life. A guide hood 11 is installed at the lower end of the cylinder 1, with swirl nozzles 4 installed inside. The diffuser hood 2 is fixedly connected above the cylinder 1, forming a dual-stage diffusion swirl structure. This allows air entering from the inlet pipe 3 to first pass through the swirl... The nozzle 4 rotates to release air, stirring the sludge and sewage. The resulting mixed fluid rotates and rises to the cylinder 1 within the guide shroud 11. The rotating mixed fluid is then cut by the serrated edge of the diffuser 2 and finally sprayed out. This process not only effectively cuts the air bubbles into dense small bubbles and prolongs the contact time between the bubbles and the sewage, but also ensures that the air, water, and sludge are fully cut and mixed, effectively improving oxygen transfer efficiency and significantly extending the service life of the aerator. Furthermore, it increases the mud-water diffusion area, prolongs the oxygen residence time, reduces the number of aerators required, and lowers the power consumption of the blower.

[0043] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the patent application of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A top-inlet type two-stage diffusion swirl aerator, comprising a cylindrical body and an air inlet pipe, characterized in that, The lower end of the cylinder is connected to a flow guide shroud, the bottom of which is open and has multiple swirling nozzles inside. A diffuser shroud is fixedly connected to the upper part of the cylinder, and the diffuser shroud and the cylinder are spaced apart to form an outlet for the mixed fluid inside the cylinder to be sprayed out. The outer edge of the diffuser shroud is serrated to cut the sprayed mixed fluid. The air inlet pipe passes through the diffuser shroud and the cylinder from top to bottom and is connected to all the swirling nozzles.

2. The top-inlet dual-stage diffusion swirl aerator according to claim 1, characterized in that, The diffuser is fixedly sleeved on the air inlet pipe, and the middle part of the diffuser protrudes to one side of the cylinder to form a funnel shape.

3. The top-inlet dual-stage diffusion swirl aerator according to claim 2, characterized in that, The diffuser includes a cover body and a cutting ring. The cover body is funnel-shaped and fitted onto the air intake pipe. The cutting ring is fixedly fitted onto the top opening edge of the cover body. The outer edge of the cutting ring is provided with a ring of sharp teeth at intervals to form a serrated shape.

4. The top-inlet dual-stage diffusion swirl aerator according to claim 1, characterized in that, The diffuser is fixedly connected to the top surface of the cylinder via a fixing bracket, and the diffuser, the air inlet pipe, and the fixing bracket are all coaxially arranged with the cylinder.

5. The top-inlet dual-stage diffusion swirl aerator according to claim 4, characterized in that, The fixing frame includes two fixing rings and multiple support rods. One of the fixing rings is fixed to the bottom of the diffuser and sleeved on the air intake pipe, and the other fixing ring is sleeved on the top opening of the cylinder. The two fixing rings are connected by all the support rods.

6. The top-inlet dual-stage diffusion swirl aerator according to claim 5, characterized in that, Each of the support rods is inclined, and all the support rods are arranged in a circle around the air intake pipe at intervals.

7. The top-inlet dual-stage diffusion swirl aerator according to claim 1, characterized in that, The diameter of the diffuser is larger than the diameter of the cylinder.

8. The top-inlet dual-stage diffusion swirl aerator according to claim 1, characterized in that, The cylinder is cylindrical, and multiple turbulence generators are provided on the inner wall of the cylinder. The turbulence generators in the same layer are arranged in a ring around the air intake pipe at intervals.

9. The top-inlet dual-stage diffusion swirl aerator according to claim 1, characterized in that, All the swirling nozzles are arranged in a dispersed manner around the air intake pipe and spray in the same direction. Each of the swirling nozzles rises along the inner wall of the deflector in a spiral path.

10. The top-inlet dual-stage diffusion swirl aerator according to claim 1, characterized in that, The bottom of the air intake pipe is connected to all the swirl nozzles via a split pipe, which is arranged radially along the guide shroud.

Images