Jet aerator with low energy consumption and high oxygenation efficiency

Abstract

The invention discloses a jet aerator with low energy consumption and high oxygenation efficiency, comprising a venturi tube and a quick-pass diamond tube of a split structure; multi-rod brackets are installed on the inner wall surfaces of the circular tubes at both ends of the venturi tube, the multi-rod brackets support the tail hook bionic stirring blades, a double-headed reverse screw is arranged inside the venturi tube, one end of the quick-pass diamond tube is connected to the venturi tube, and the other end extends into an air suction chamber, the upper part of the air suction chamber is connected to an air supply pipe, the end of the air suction chamber away from the venturi tube is connected to a mixing cavity tube, the mixing cavity tube is connected to the front end of a throat pipe, a gradually expanding imitation wing-shaped blade group and a special-shaped conical hole plate are arranged inside the mixing cavity tube, and a grid plate scattering nozzle is arranged inside the throat pipe; compared with a circular pipe, the quick-pass diamond tube of the invention can provide a greater water conveying capacity; the gradual spiral body design on the double-headed reverse screw can generate vortices and turbulence, improve the turbulence intensity of water flow, and improve the mixing and diffusion capacity of water flow, thereby improving the oxygenation efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a jet aerator with low energy consumption and high oxygenation efficiency. Background Art

[0002] The jet aeration device is an indispensable equipment in sewage treatment. It can effectively mix gas and liquid when treating sewage, increase the dissolved oxygen content in the water, and then enhance the metabolic ability of aerobic microorganisms to decompose impurities in sewage, thereby optimizing the effect of sewage treatment.

[0003] In the process of sewage treatment, the gas-liquid two-phase fluid caused by jet aeration will produce significant interactions. The water pump injects the liquid from the water inlet pipe into the jet aerator, which will induce a high-speed columnar swirl state. When the rotating scattered liquid passes through the suction chamber, a local negative pressure will be formed, and the air will be sucked into the jet aerator through the air inlet pipe. At the same time, the airflow is mixed with the high-speed liquid, and mass, momentum and energy are transferred in this process, producing a continuous and chaotic three-phase flow state of air, liquid and sludge. This gas-liquid-solid mixture then flows out through the diffuser to form a high-speed jet shape with strong splashing force. This high-speed jet can not only improve the aeration and stirring effect of sewage, but also effectively remove organic pollutants in sewage, achieving good sewage treatment effect. At the same time, this technology is easy to operate, efficient, environmentally friendly and energy-saving, and has good application prospects.

[0004] At present, in order to improve the working efficiency and oxygenation effect of the jet aerator, the existing technology generally adopts means such as increasing the water supply pressure, reducing the nozzle diameter and increasing the air supply flow rate to achieve the above goals. However, such methods inevitably lead to a significant increase in the overall energy consumption of the jet aerator, thereby greatly increasing the economic expenditure cost. In view of this, in order to effectively improve the comprehensive efficiency of sewage treatment, it is urgent to develop a jet aerator with low energy consumption, high oxygenation efficiency and sufficient mixing effect, so as to solve the problem of excessive energy consumption in the existing technology and achieve a win-win situation of economic benefits, ecological benefits and social benefits. Summary of the invention

[0005] The purpose of the present invention is to provide a jet aerator with low energy consumption and high oxygenation efficiency, so as to solve the problems of poor gas-liquid mixing effect and high energy consumption of the current jet aerator.

[0006] The technical solution adopted by the present invention is a jet aerator with low energy consumption and high oxygenation efficiency, including a venturi tube and a quick-pass diamond tube of a split structure, the two ends of the venturi tube are designed as circular tubes, and the middle part is a pipeline that first contracts and then expands gradually from the middle to the two ends; multi-rod brackets are arranged on the inner wall surfaces of the circular tubes at both ends of the venturi tube, and the multi-rod brackets are connected with supporting tail hook bionic stirring blades, and the interior of the venturi tube contains a double-headed reverse screw, one end of the quick-pass diamond tube is connected to the venturi tube, and the other end extends into the air intake chamber to form a relatively closed space, the upper part of the air intake chamber is connected to the air supply pipe, and the end of the air intake chamber away from the venturi tube is connected to the mixing cavity tube through a flange, the mixing cavity tube is connected to the front end of the throat pipe, and the interior of the mixing cavity tube is provided with a gradually expanding wing-shaped blade group and a special-shaped conical hole plate, and the throat pipe is provided with a grid plate scattering nozzle.

[0007] The present invention is also characterized in that:

[0008] The Venturi tube is a split installation structure, which consists of two sections of circular tubes with the same diameter and a split pipe that gradually contracts and then expands. When the fluid enters the contraction section of the Venturi tube, its flow rate gradually increases. According to the Bernoulli principle, the static pressure of the fluid decreases accordingly. At the throat of the contraction section, the flow rate reaches the maximum value, while the pressure drops to the minimum. Subsequently, the flow rate decreases in the diffusion section, and the pressure gradually increases.

[0009] The tail hook bionic stirring blade structure has two edges that are arc-shaped in the width direction. In the thickness direction, the top is designed as a streamlined arc surface, the bottom is flat, and the end of the blade is a serrated structure. In the longitudinal direction of the blade, the width is designed to be narrow first, then wide, and then gradually narrow. At the same time, the thickness of the blade gradually increases from thin to the thickest, and then thins again. The end of the blade is designed with a folding structure to form a small wing. During the stirring process, the serrated structure at the trailing edge can enhance the degree of liquid turbulence, and the bent blade at the tip can weaken the viscous effect of the water flow near the wall on the pipe wall, making the stirring process more efficient. At the same time, it can shear large particles in the sewage when the water enters, forming smaller particles to achieve better aeration effect. The special geometric shape of the serrated blade can generate efficient shear force in the fluid, thereby promoting better mixing of gas and liquid. The unique structure of the blade surface helps to strengthen the mass transfer process between gas and liquid. This design can increase the degree of fluid turbulence and improve mixing efficiency.

[0010] The double-headed reverse screw is installed in the Venturi pipe and arranged along the length of the Venturi pipe. The spiral lines at both ends of the double-headed reverse screw rotate in different directions and the circumferential size matches the structure of first contraction and then expansion in the Venturi pipe; the tail hook bionic stirring blade will initially stir and shear the sewage entering the jet aerator. The design of the double-headed reverse screw can adjust the path of gas-liquid flow, so that the gas and liquid are constantly staggered and mixed during the flow. After being stirred by the tail hook bionic stirring blade, the larger solid particles in the liquid have been cut into small solid particles. At this time, the axial stirring action of the double-headed reverse screw, that is, along the axis direction of the screw, further improves the mixing effect inside the pipe. When the water flows through the double-headed reverse screw, the blades of the double-headed reverse screw will guide the water flow, so that the water flow accelerates along the blade surface, which can not only increase the outlet speed of the water flow, but also reduce the kinetic energy loss of the water flow, thereby improving the transportation efficiency of the entire pipeline system. The tail hook bionic stirring blade will initially stir and shear the sewage entering the jet aerator. The design of the double-head reverse screw can adjust the path of gas-liquid flow, so that the gas and liquid are constantly staggered and mixed during the flow, thereby promoting the energy and mass transfer between the two phases. The particles or flocs in the sewage will form smaller discrete particles or flocs after stirring and shearing.

[0011] The mixing chamber tube is connected with the suction chamber and the throat tube through a flange; a gradually expanding wing-shaped blade group and a toothed baffle are arranged in the mixing chamber tube, the toothed baffle is installed on the inner wall of the mixing chamber tube, the gradually expanding wing-shaped blade group is divided into a first-stage rotating blade, a second-stage rotating blade, a third-stage rotating blade, and a fourth-stage rotating blade, and the length of the blade increases with the increase of the stage, forming a gradually deformed wing-shaped bionic blade group; the gradually expanding wing-shaped blade group is installed on the rotating shaft, bearings are installed at both ends of the rotating shaft, the outer ring of the bearing is fixed at the center hole of the special-shaped tapered hole plate and axially fixed by a bearing end cover; the blade shape of the gradually expanding wing-shaped blade group is a bionic sawfish snout saw-shaped blade.

[0012] The fast-pass diamond tube is a diamond-shaped annular tube, with trumpet-shaped connecting tubes at both ends of the diamond-shaped annular tube. The venturi tube is connected to one of the trumpet-shaped connecting tubes with a larger diameter, and the other trumpet-shaped connecting tube with a smaller diameter is located in the suction chamber. The fast-pass diamond tube can improve the smoothness of water flow. At the trumpet-shaped connecting tube end of the fast-pass diamond pipe, the contraction of the flow section causes the fluid to accelerate, forming a local negative pressure area. In the terminal drainage straight pipe, water flows out along the pipe wall, forming a thin-walled laminar flow state. Since bubbles or air columns will form inside the water flow, the negative pressure generated by the siphon effect will be destroyed, thereby weakening the siphon effect. After the introduction of the fast-pass diamond pipe structure, its design destroys the original air column, promotes gas-liquid mixing, and effectively maintains the required negative pressure level in the pipe. This negative pressure suction effect enhances the power of the fluid, thereby significantly increasing the flow rate, reducing the flow resistance of the fluid in the nozzle, and thus improving the injection speed and efficiency. Its unique cross-sectional design reduces the resistance of the water flow in the pipe and improves the circulation efficiency.

[0013] The suction chamber is a closed environment with a certain space. The upper part of the suction chamber is connected to the suction port. The high-speed jet ejected by the fast-pass diamond tube nozzle can guide the external gas from the suction port into the suction chamber and cause preliminary mixing of gas and liquid.

[0014] The mixing cavity tube is connected to the suction chamber pipeline and the throat tube through a flange, and can be disassembled and assembled as a whole. A gradually expanding wing-shaped blade group and a toothed baffle are arranged inside the mixing cavity tube. The toothed baffle is installed on the inner wall of the mixing cavity tube. The gradually expanding wing-shaped blade group can be divided into a first-stage rotating blade, a second-stage rotating blade, a third-stage rotating blade, and a fourth-stage rotating blade. The length of the blade increases with the increase of the stage, forming a gradually deformed wing-shaped bionic blade group. When the water flow impacts, the blades of each stage can perform independent asynchronous rotation movement. The gradually expanding wing-shaped blade group is installed on the rotating shaft, and bearings are installed at both ends. The outer ring of the bearing is fixed on the central hole of the special-shaped tapered hole plates at both ends and axially fixed with end covers; the special-shaped tapered hole plates are designed with sealing grooves for installing sealing gaskets, which are connected by flanges; the edges of the blades of the gradually expanding wing-shaped blade group are arc-shaped in the width direction, and in the thickness direction, the top is designed as a streamlined arc surface, and the bottom is a flat surface. In the longitudinal direction of the blade, its width is designed to be narrow first, then wide, and then gradually narrowed. At the same time, the thickness of the blade gradually increases from thin to the thickest, and then thins down, and the trailing edge of the blade is a serrated structure. The design can generate eddies and shear forces. The serrated trailing edge helps improve the mixing of the blade wake, stirring the high-speed blade edge fluid with the low-speed tube wall fluid. The bionic wing shape can cause fluid separation and reattachment, which can increase the turbulence of the gas-liquid mixture near the wall. The wing-shaped blades will cause changes in the local pressure and velocity fields. These changes will affect the flow characteristics of the gas-liquid two-phase flow, help the bubbles or droplets in the flow field to break or merge, and then optimize the mixing process. This design can improve the efficiency of breaking up, so that solid particles, liquids or gases in the water flow can be mixed quickly and evenly.

[0015] The special-shaped conical hole plates are respectively installed at the front and rear ends of the mixing cavity tube. The special-shaped conical hole plates are designed with sealing grooves, and sealing gaskets are installed in the sealing grooves. The edges of the blades on both sides of the gradually expanding wing-shaped blade group are arc-shaped in the width direction, and in the thickness direction, the top is designed as a streamlined arc surface, and the bottom is a flat surface. In the longitudinal direction of the blade, its width is designed to be narrow first, then wide, and then gradually narrowed. At the same time, the thickness of the blade gradually increases from thin to thick and then thins, and the trailing edge of the blade is a serrated structure.

[0016] The special-shaped conical hole plates are installed at the front and rear ends of the mixing cavity tube, and the plates are designed with multiple tapered special-shaped cross holes with cone angles. When water flows through the special-shaped conical hole plate, the liquid has good permeability. The design of the cross-shaped nozzle can provide a more uniform fluid distribution. Due to its four symmetrical outlets, the fluid can be evenly diffused. When the fluid flows through the porous plate, its initial flow pattern is disturbed, and the flow beam is locally contracted, thereby forming a local low-pressure, high-speed jet. Due to the limitation of the hole, the flow area of ​​the fluid when passing through the hole is reduced, thereby increasing the fluid speed. The through-hole diameter is much larger than the particulate matter or flocculent matter, and it is not easy to form a blockage. The special-shaped conical hole plate can increase the turbulent kinetic energy of the gas-liquid mixture and can divert the fluid into multiple flow channels to achieve the atomization effect as much as possible.

[0017] The toothed baffle is welded on the inner wall of the mixing chamber tube. The toothed baffle is an arc structure with an angle of 150° around the inner wall of the mixing chamber tube. There are three layers of toothed baffles distributed axially and 120° circumferentially, forming a distribution mode in which the toothed baffles at each level are staggered with each other and partially overlapped in the circumferential direction. The toothed baffle is staggered with the gradually expanding wing-shaped blade group. When the gradually expanding wing-shaped blade group rotates, the gas-liquid mixture is first stirred and sheared, and then collides with the toothed baffle. At this time, the gas-liquid mixture will merge and the pressure increase after the collision will increase the gas pressure in the gas-liquid mixture, and the gas will be compressed. After the stirring of the multi-stage rotating blades and the pressurization effect of the toothed baffle, the gas-liquid mixture flowing out of the mixing chamber tube has higher energy and the gas-liquid mixture is further fused to form an emulsified liquid-like micro-bubble fluid liquid column.

[0018] The throat is connected to the mixing cavity tube through a flange, and a grid scattering nozzle is installed at the end of the throat. After the gas-liquid mixture passes through the mixing cavity tube and is fully fused, it will flow into the throat. A grid scattering nozzle is installed at the end of the throat. The grid scattering nozzle forces the water flow to flow through a series of staggered compartments, thereby destroying the laminar flow state of the water flow and increasing its turbulence. At the end of the throat, the diverter grid can reduce the formation of sediments by increasing the flow rate and turbulence, allowing the water containing tiny impurities to pass smoothly. The multiphase flow hits the trapezoidal teeth of the scattering nozzle at the end of the grid, which will change the direction of the water flow and generate a certain vortex, which is helpful to separate and precipitate some suspended matter and play a certain purification role. The rectification effect of the throat will cause the gas-liquid mixture to flow out along the axial direction, flow into the diffuser, and then be diffused and sprayed into the external environment.

[0019] The beneficial effects of the present invention are:

[0020] Compared with the prior art, the present invention makes the following improvements on the basis of the existing jet aerator:

[0021] First, a Venturi tube, a tail hook bionic stirring blade and a double-headed reverse screw are set in the water inlet pipe. Tail hook bionic stirring blades and double-headed reverse screws are set in the circular tubes at both ends of the Venturi tube for stirring and mixing. The geometric structure of the serrated blades can generate efficient shear force in the fluid, thereby promoting better mixing of gas and liquid. The unique structure of the blade surface helps to strengthen the interphase mass transfer process of gas and liquid. This design can increase the turbulence of the fluid and improve the mixing efficiency. The double-headed reverse screw guides and accelerates the water flow through its spiral blades, thereby increasing the flow rate of the water flow. At the same time, the gradient spiral design on the double-headed reverse screw can generate vortices and turbulence, increase the turbulence of the water flow, and enhance the mixing and diffusion capacity of the water flow.

[0022] Second, the unique structure of the speed-pass diamond pipe can generate turbulence in the water flow and increase the turbulence intensity of the fluid. Turbulence can promote mixing inside the fluid and improve mass transfer and reaction rates during water treatment. The bottom and side wall design of the speed-pass diamond pipe helps to reduce the accumulation of sediment in the water flow. Due to the special shape of the pipe, the flow pattern of water in the pipe is conducive to flushing away sediment and keeping the pipe clean. The structural characteristics of the speed-pass diamond pipe can provide greater water transmission capacity than circular pipes.

[0023] Third, a special-shaped conical orifice plate, a gradually expanding wing-shaped blade group and a toothed baffle are arranged in the mixing chamber tube. The special-shaped conical orifice plate will change the flow pattern of the gas-liquid two-phase flow. Before the orifice plate, the gas-liquid two-phase is in a relatively stable flow pattern, but after passing through the orifice plate, due to the change of flow velocity and pressure, the flow pattern will change from stratified flow to slug flow, foam flow and other flow patterns. The special-shaped conical orifice plate can also change the velocity distribution of the fluid, so that the velocity of the fluid at the orifice plate increases, which can increase the pulsation and vortex of the gas-liquid two-phase flow. Due to the limitation of the hole, the flow area of ​​the fluid when passing through the hole is reduced. According to the law of conservation of mass, the fluid velocity increases. The gas-liquid two-phase is fully mixed by the alternating action of the rotating blade stirring and the toothed baffle turbulence, and is ejected into the second layer of special-shaped conical orifice plate at the rear end of the mixing chamber tube, which can separate the fluid into multiple flow channels, has a diversion effect, and can further discretize the gas-liquid mixture to achieve the atomization effect as much as possible. This design will make the entire section of the fluid in a turbulent gas-liquid two-phase state, so that it will be vertically ejected to the cross-section of the special-shaped conical orifice plate, reducing the loss of jet kinetic energy and being able to continuously maintain the tiny bubbles that have been formed in the mixing cavity tube, thereby improving the oxygen utilization efficiency of aerobic microorganisms. The design of the special-shaped conical orifice plate with a tapered opening helps to promote the turbulence of the fluid, thereby increasing the mixing inside the fluid, which is very beneficial for improving the fluid mixing efficiency of water treatment. Due to its four-petal symmetrical outlet, the fluid can be evenly dispersed, and the tapered orifice plate can cause the water flow to generate vortices behind the orifice plate, which helps to further increase the turbulence and mixing of the fluid. The special-shaped conical hole plate and the gradually expanding wing-shaped blade group are connected by a rotating shaft. The water flow impacts the gradually expanding wing-shaped blade group. The rotating blades convert the kinetic energy of the high-pressure water flow into mechanical energy to drive the rotating blades to rotate at high speed. During the rotation process, the blades shear and break up the initial mixture of liquid and gas sucked in by negative pressure. The initial mixture is in a state of initial contact between gas and liquid. At this time, the gas and liquid phases are in a separated state and are both continuous media. When passing through multiple stages of high-speed rotating blades, the gas-liquid mixture is continuously stirred and sheared again. The gas and liquid phases are broken up and cut from a continuous state into a disordered state and form a large number of tiny bubbles, which increases the contact surface area between gas and sewage, thereby improving the oxygenation efficiency. The inner wall of the mixing cavity tube is installed with a combination structure of a toothed baffle and a gradually expanding wing-shaped blade, forming a working principle similar to that of a compressor. The multi-stage rotating blades will each produce a cutting effect on the fluid during the rotational motion, so a pressure difference is formed before and after the blades. This pressure difference will generate a driving force for the fluid in the pipeline, causing the fluid to flow along the rotation direction of the blades. At the same time, the toothed baffles will hinder the flow before the fluid enters the multi-stage rotating blades, increasing the resistance, changing the flow path and forming vortices, thereby causing fluid separation and increasing the velocity gradient. The gas-liquid two-phase flow is compressed when it enters between the blades and the toothed baffles, and is further compressed by rotation inside. This design can more effectively increase the pressure in the mixing cavity tube. The higher the pressure, the faster the mass transfer efficiency of the gas-liquid two-phase flow.The combination of wing-shaped blades and toothed baffles effectively increases the turbulence of the fluid in the pipeline, improves the mixing and exchange capacity of the fluid, and the fluid may be deposited in the pipeline. This combination can disturb the water flow, improve the multiphase flow pattern, and prevent the formation of sediment. After being stirred at high speed by the rotating blades, the gas and liquid phases will collide with the toothed baffle on the inner wall of the mixing cavity in a turbulent state, making it difficult for the tiny bubbles formed under the high-speed rotation of the rotating blades to synthesize into larger bubbles, and can maintain the full mixing state of the gas and liquid phases and the diameter of the tiny bubbles, thereby ensuring the oxygenation efficiency.

[0024] Fourth, set up a throat and install a grid scattering nozzle at the end of the throat. The grid scattering nozzle destroys the laminar flow state of the fluid through the grid, increases the turbulent intensity of the fluid, makes the mixing between the activated sludge flocs and tiny bubbles more complete, improves the uniformity of the multiphase mixture, and the solid particles or sediments in the pipeline fluid are deposited due to uneven flow velocity. The diverter grid increases the flow velocity and turbulence. When the sewage multiphase flow hits the trapezoidal teeth of the scattering nozzle at the end of the grid, it will change the direction of the water flow and produce a certain scattered atomized flow, which is helpful to separate and precipitate some suspended matter and play a certain purification role. The kinetic energy generated by the high-speed gas-liquid jet in the throat will be converted into shear force, which can increase the rate of gas-liquid mass transfer and promote the dissolution and transfer of gas in liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the jet aerator described in the present invention.

[0026] Figure 2 It is an exploded view of the internal structure of the venturi tube described in the present invention.

[0027] Figure 3 It is a schematic diagram of the structure of the tail hook bionic stirring blade described in the present invention.

[0028] FIG. 4( a ) is a schematic diagram of a half-section structure of the fast-pass diamond tube according to the present invention.

[0029] FIG. 4( b ) is a schematic diagram of the overall structure of the fast-pass diamond tube described in the present invention.

[0030] Figure 5 It is an exploded view of the internal structure of the mixing cavity tube described in the present invention.

[0031] Figure 6 It is a schematic diagram of the structure of the gradually expanding wing-shaped blade group described in the present invention.

[0032] Figure 7 It is a schematic diagram of the structure of the mixing cavity tube described in the present invention.

[0033] Figure 8 This is the distribution diagram of the toothed baffle described in the present invention.

[0034] Fig. 9 It is a schematic diagram of the structure of the special-shaped tapered hole plate described in the present invention.

[0035] Fig.10 It is a schematic diagram of the structure of the grid scattering nozzle described in the present invention.

[0036] In the figure: 1. multi-rod bracket, 2. tail hook bionic stirring blade, 3. venturi tube, 4. double-head reverse screw, 5. air supply pipe, 6. fast-pass diamond tube, 7. suction chamber, 8. special-shaped conical hole plate, 81. tapered special-shaped cross hole, 82. sealing groove, 9. gradually expanding wing-shaped blade group, 10. mixing cavity tube, 101. toothed baffle, 11. throat, 12. grid plate scattering nozzle, 13. sealing gasket, 14. bearing end cover, 15. bearing. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0038] Example 1

[0039] The jet aerator of the present invention has both low energy consumption and high oxygenation efficiency, such as Figure 1 As shown, it is improved from the commonly used jet aerator, including a venturi tube 3 and a quick-pass diamond tube 6 of a split structure, the two ends of the venturi tube 3 are designed as circular tubes, and the middle part is a pipeline that first contracts and then expands gradually from the middle to the two ends; the inner wall surfaces of the circular tubes at both ends of the venturi tube 3 are provided with multi-rod brackets 1, and the multi-rod brackets 1 are connected with supporting tail hook bionic stirring blades 2, the venturi tube 3 contains a double-head reverse screw 4, one end of the quick-pass diamond tube 6 is connected to the venturi tube 3, and the other end extends into the suction chamber 7 to form a relatively closed space, the upper part of the suction chamber 7 is connected to the air supply pipe 5, and the end of the suction chamber 7 away from the venturi tube 3 is connected to the mixing cavity tube 10 through a flange, and the mixing cavity tube 10 is connected to the front end of the throat 11, and the mixing cavity tube 10 is provided with a gradually expanding wing-shaped blade group 9 and a special-shaped conical hole plate 8, and a grid plate scattering nozzle 12 is installed inside the throat 11.

[0040] Example 2

[0041] The difference from Example 1 is that

[0042] like Figure 2-3 As shown, the structure of the tail hook bionic stirring blade 2 is that the edges of both sides are arc-shaped in the width direction, and in the thickness direction, the top is designed as a streamlined arc surface, and the bottom is a flat surface. The end of the bionic blade is a serrated structure. In the longitudinal direction of the blade, its width is designed to be narrow first, then wide, and then gradually narrow. At the same time, the thickness of the blade is also gradually increased from thin to the thickest, and then thinned again. A folding structure is designed at the end of the blade to form a hook-shaped wing. The tail hook bionic stirring blade 2 is installed on the inner wall surface of the circular tube at both ends of the venturi tube 3.

[0043] The middle of the Venturi tube 3 is a split first contraction and then expansion pipeline, and the multi-rod bracket 1 is used to support the tail hook bionic stirring blade 2 inside the circular tube, which is respectively installed on the inner wall of the circular tube at both ends; the double-headed reverse screw 4 is installed inside the Venturi tube, and the spiral lines at both ends of the double-headed reverse screw 4 rotate in opposite directions and the circumferential size matches the first contraction and then expansion structure in the Venturi tube 3. The tail hook bionic stirring blade 2 stirs and shears the sewage that initially enters the jet aerator, and the design of the double-headed reverse screw 4 can adjust the flow path of the gas-liquid mixture, so that the gas and liquid are continuously alternately mixed in the flow, thereby promoting the energy and mass transfer between the two phases, and the particles or flocs in the sewage will form smaller discrete particles or flocs after stirring and shearing.

[0044] Example 3

[0045] The difference from Example 1 is that

[0046] like Figure 1 As shown in Fig. 4 (a) and Fig. 4 (b), the fast-pass diamond tube 6 includes a diamond ring tube, and trumpet-shaped connecting tubes are respectively arranged at both ends of the diamond ring tube. The Venturi tube is adapted to communicate with one of the trumpet-shaped connecting tubes with a larger diameter, and the other trumpet-shaped connecting tube with a smaller diameter is located in the suction chamber; one end of the fast-pass diamond tube 6 is connected to the Venturi tube 3, and the other end extends into the suction chamber 7 to form a relatively closed space. The fast-pass diamond tube 6 can enhance the smoothness of water flow. At the trumpet-shaped connecting tube end of the fast-pass diamond tube, due to the contraction of the flow cross section, the fluid is accelerated to form a local negative pressure area.

[0047] The upper part of the air suction chamber 7 is connected to the air supply pipe 5. The high-speed jet ejected through the fast-pass diamond tube 6 can guide the external gas from the air supply pipe 5 into the air suction chamber 7, and a preliminary mixing of gas and liquid occurs.

[0048] Example 4

[0049] The difference from Example 1 is that

[0050] like Figure 5-10 As shown, the special-shaped conical orifice plate 8 is respectively installed at the two ends of the mixing cavity tube 10 through flanges. The front and back of the special-shaped conical orifice plate 8 have sealing grooves 82. The sealing gasket 13 is placed at the sealing grooves 82 of the special-shaped conical orifice plate 8, connected by flanges and tightened as a whole by bolts. The gas-liquid two-phase flow has good passability when passing through the special-shaped conical orifice plate 8 with a tapered special-shaped cross hole 81. The two special-shaped conical orifice plates 8 are arranged in a staggered manner. Due to the limitation of the hole, the flow area of ​​the fluid when passing through the hole is reduced, thereby increasing the fluid speed. The through-hole diameter is much larger than the particulate matter or flocculent matter, and it is not easy to form a blockage. The through-hole special-shaped conical orifice plate can increase the turbulent kinetic energy of the gas-liquid mixture and can block the fluid into multiple flow channels to achieve the atomization effect as much as possible.

[0051] The mixing chamber tube 10 is installed by a flange and can be disassembled as a whole. The mixing chamber tube 10 is provided with a special-shaped conical hole plate 8, a gradually expanding wing-shaped blade group 9 and a toothed baffle 101. The toothed baffle 101 is arranged on the inner wall of the mixing chamber tube 10. The gradually expanding wing-shaped blade group 9 is composed of a first-stage rotating blade, a second-stage rotating blade, a third-stage rotating blade and a fourth-stage rotating blade. The length of the blade increases with the increase of the number of stages, forming a gradually deformed gradually expanding wing-shaped blade group 9. The gradually expanding wing-shaped blade group 9 is installed on the rotating shaft. Bearings 15 are installed at both ends of the rotating shaft of the gradually expanding wing-shaped blade group. The outer ring of the bearing 15 is fixed at the center hole of the special-shaped conical hole plate 8 at both ends and is axially fixed by the bearing end cover 14. The blade shape of the gradually expanding wing-shaped blade group 9 is a bionic sawfish snout saw blade.

[0052] Example 5

[0053] The difference from Example 1 is that

[0054] The throat pipe 11 is connected to the mixing chamber pipe 10 through a flange, and a grid scattering nozzle 12 is provided at the end of the throat pipe 11. Fig. 9 As shown, the grid plate scattering nozzle 12 destroys the laminar flow state of the fluid and strengthens the turbulence of the fluid, so that the mixing between the activated sludge flocs and the tiny bubbles is more complete. In the multiphase flow in the pipeline, the grid of the grid plate scattering nozzle 12 can promote the mixing between different components and improve the uniformity of the mixture. The solid particles or sediments in the pipeline fluid are deposited due to uneven flow velocity. The grid helps to prevent the formation of these sediments by increasing the flow velocity and turbulence. The gas-liquid mixture passing through the mixing cavity tube 10 will flow into the throat 11 after being fully fused. The rectification effect of the throat 11 will cause the gas-liquid mixture to flow out along the axial direction and be sprayed into the external environment through diffusion.

[0055] Example 6

[0056] The jet aeration method with built-in detachable multi-stage rotating blades and special-shaped conical hole plates of the present invention has the following specific operating steps:

[0057] The jet aerator is placed in the sewage environment of the aerobic section. Different inlet pipe lengths are selected according to the sewage liquid level. The water pipe is connected to the circulation pump. The sewage is pumped into the jet aerator by the circulation pump. The sewage flows in from the Venturi tube and drives the blades to rotate when passing through the tail hook bionic stirring blades. When the water flows through the double-headed reverse screw, it will change the flow direction and speed of the fluid, increase the turbulence of the fluid, and thus enhance the flow effect of the fluid in the pipeline. The transfer of kinetic energy and mechanical energy is generated in the pipeline. The blades rotate and rotate. The particles or flocs in the sewage are initially stirred and sheared by the two-stage rotating blades. The sewage passes through the speed-up of the fast-pass diamond-shaped pipe-shaped nozzle to generate a high-speed water flow. When the high-speed water flow is sprayed into the suction chamber, a local negative pressure is generated. The suction chamber is connected to the suction port. The external atmospheric pressure squeezes the gas from the suction port into the suction chamber. This drainage method reduces energy consumption. The gas entering the suction chamber is initially mixed with the high-pressure water flow. At this time, the gas and liquid phases are in a separated state and are both continuous media. When the gas-liquid mixture flows through the first layer of the special-shaped cone hole plate, it will hit the plate wall. The pressure at the time of contact increases, and the gas-liquid two phases merge with each other under the action of pressure. At this time, the gas-liquid two phases are in a mixed state, and the bubble diameter generated by the gas is larger. At the same time, under the action of pressure, the gas-liquid mixture at this time flows into the mixing cavity tube through the through hole of the special-shaped cone hole plate. The gas-liquid mixture pressurized by the special-shaped cone hole plate will first hit the first-stage rotating blade of the gradually expanding wing-shaped blade group in the mixing cavity tube, which will generate energy transfer and convert the kinetic energy of the gas-liquid mixture into blade rotation. The mechanical energy of rotation, as this energy is continuously transmitted, will drive the gradually expanding wing-shaped blade group to accelerate rotation. The stirring shear caused by the independent rotation of blades at each level will intensify the mixing state of the gas-liquid two-phase in the mixing cavity. At the same time, under the obstruction of the toothed baffle, the gas-liquid mixture hits the toothed baffle, and the kinetic energy is transferred to the gas, which is accelerated and compressed. The rotation of the rotating blades and the pressurization of the toothed baffle further intensify the mixing of the gas-liquid two-phase in the mixing cavity. The tiny bubbles generated at this time are dispersed in the liquid to form an emulsified mixed liquid. This emulsified mixed liquid hits the second layer of special-shaped cone hole plate and flows into the throat through the special-shaped through hole. A grid plate scattering nozzle is set at the end of the throat to interrupt the laminar state of the fluid and increase the turbulence of the fluid, so that the mixing between the fluid micro-groups is more complete. In the multiphase flow in the pipeline, the diverter grid can promote the mixing between different components and improve the uniformity of the mixture. The solid particles or sediments in the pipeline fluid are deposited due to uneven flow velocity. The diverter grid helps to prevent the formation of these sediments by increasing the flow velocity and turbulence. When the multiphase flow hits the trapezoidal teeth of the grid plate scattering nozzle, the water flow direction will be changed, generating a certain vortex, which helps to separate and precipitate some suspended matter and plays a certain purification role. After the throat pipe rectification, the mixed liquid will flow at high speed along the throat pipe outlet direction and flow into the outside through the diffuser. This device miniaturizes the bubbles, increases the contact area between the bubbles and the sewage, and improves the oxygenation efficiency.

Claims

1. A jet aerator with low energy consumption and high oxygenation efficiency, characterized in that: The invention comprises a split-structured venturi tube (3) and a quick-pass diamond tube (6), wherein the two ends of the venturi tube (3) are designed as circular tubes, and the middle part is a conduit that first contracts and then expands gradually from the middle to the two ends; the inner wall surfaces of the circular tubes at the two ends of the venturi tube (3) are provided with a multi-rod bracket (1), and the multi-rod bracket (1) is connected to a supporting tail hook bionic stirring blade (2); a double-headed reverse screw (4) is provided inside the venturi tube (3); one end of the quick-pass diamond tube (6) is connected to the venturi tube ( 3), and the other end extends into the suction chamber (7) to form a relatively closed space. The upper part of the suction chamber (7) is connected to the air supply pipe (5). The end of the suction chamber (7) away from the venturi tube (3) is connected to the mixing chamber tube (10) through a flange. The mixing chamber tube (10) is connected to the front end of the throat tube (11). The mixing chamber tube (10) is provided with a gradually expanding wing-shaped blade group (9) and a special-shaped conical hole plate (8). The throat tube (11) is provided with a grid plate scattering nozzle (12).

2. The jet aerator with low energy consumption and high oxygenation efficiency according to claim 1, characterized in that: The tail hook bionic stirring blade (2) has an arc-shaped edge on both sides in the width direction, a streamlined arc surface on the top and a flat surface on the bottom in the thickness direction, and a sawtooth structure at the end of the blade; in the longitudinal direction of the blade, the width is designed to be narrow first, then wide and then gradually narrower, and the thickness of the blade is also gradually increased from thin to the thickest and then thinned again, and the end of the blade is designed to have a folding structure to form a small wing.

3. The jet aerator with low energy consumption and high oxygenation efficiency according to claim 2, characterized in that: The double-headed reverse screw (4) is arranged along the length direction of the venturi tube (3); the spiral lines at both ends of the double-headed reverse screw (4) rotate in different directions and the circumferential dimensions match the structure of first contracting and then expanding in the venturi tube (3); the tail hook bionic stirring blade (2) stirs and shears the sewage initially entering the jet aerator; the design of the double-headed reverse screw (4) can adjust the path of gas-liquid flow, so that the gas and liquid are continuously staggered and mixed during the flow.

4. The jet aerator with low energy consumption and high oxygenation efficiency according to claim 2, wherein the mixing chamber tube (10) is connected to the suction chamber and the throat tube (11) through a flange; a gradually expanding wing-shaped blade group (9) and a toothed baffle (101) are arranged inside the mixing chamber tube (10), and the toothed baffle (101) is installed on the inner wall of the mixing chamber tube (10); the gradually expanding wing-shaped blade group (9) is divided into a first-stage rotating blade, a second-stage rotating blade, a third-stage rotating blade, and a fourth-stage rotating blade, and the length of the blade increases with the increase of the stage number, forming a gradually deformed wing-shaped bionic blade group; the gradually expanding wing-shaped blade group (9) is installed on a rotating shaft, and bearings (15) are installed at both ends of the rotating shaft, and the outer ring of the bearing (15) is fixed at the center hole of the special-shaped tapered hole plate (8) and is axially fixed by a bearing end cover (14); the blade shape of the gradually expanding wing-shaped blade group (9) is a bionic sawfish snout saw-shaped blade.

5. According to the jet aerator with low energy consumption and high oxygenation efficiency as described in claim 2, a sealing groove (82) is designed on the special-shaped conical hole plate (8), and a sealing gasket (13) is installed in the sealing groove (82); the edges on both sides of the blades of the gradually expanding wing-shaped blade group (9) are arc-shaped in the width direction, and in the thickness direction, the top is designed as a streamlined arc surface, and the bottom is a flat surface. In the longitudinal direction of the blade, its width is designed to be narrow first, then wide, and then gradually narrowed. At the same time, the thickness of the blade is also gradually thickened from thin and then thinned, and the trailing edge of the blade is a serrated structure.

6. The jet aerator with low energy consumption and high oxygenation efficiency according to claim 2, characterized in that: The special-shaped conical hole plate (8) is respectively installed at the front and rear ends of the mixing cavity tube (10), and the special-shaped conical hole plate (8) is designed with a plurality of tapered special-shaped cross holes (81) with cone angles.

7. The jet aerator with low energy consumption and high oxygenation efficiency according to claim 4, characterized in that: The toothed baffle (101) is welded to the inner wall of the mixing chamber tube (10); the toothed baffle (101) is an arc-shaped structure with a circumference of 150° around the inner wall of the mixing chamber tube, with three layers of toothed baffles distributed axially and 120° distributed circumferentially, forming a distribution mode in which the toothed baffles of each level are staggered and partially overlapped in the axial direction; the toothed baffle (101) is staggered with the gradually expanding wing-shaped blade group (9).

8. The jet aerator with low energy consumption and high oxygenation efficiency according to claim 2, characterized in that: The throat pipe (11) is connected to the mixing chamber pipe (10) via a flange, and a grid plate scattering nozzle (12) is installed at the end of the throat pipe (11).

9. The jet aerator with low energy consumption and high oxygenation efficiency according to claim 2, characterized in that: The fast-pass diamond tube (6) comprises a diamond ring tube, and trumpet-shaped connecting tubes are respectively arranged at both ends of the diamond ring tube. The Venturi tube (3) is adaptively connected to one of the trumpet-shaped connecting tubes with a larger diameter, and the other trumpet-shaped connecting tube with a smaller diameter is located in the suction chamber (7).

Images