Jet aerator with multi-stage coaxial reverse blades and spliced ​​textured nozzles

Abstract

The invention discloses a jet aerator containing multi-stage coaxial reversing blades and a spliced ​​texture nozzle, comprising a water inlet pipe, the inner wall of the water inlet pipe is connected with a plurality of shearing units along its length direction, one end of the water inlet pipe is connected with a primary nozzle, the primary nozzle is connected with a secondary nozzle through a circular tube, the outer wall of the circular tube is connected with an air suction chamber, the secondary nozzle is arranged in the air suction chamber, the outer wall of the air suction chamber is connected with an air suction pipe, the end of the air suction chamber away from the circular tube is connected with a mixing chamber, the inner wall of the mixing chamber is connected with a coaxial reversing mechanism, the coaxial reversing mechanism is connected with a rotating unit, and the end of the mixing chamber away from the air suction chamber is connected with a spliced ​​texture nozzle through a flange. The invention can realize the refinement treatment of sewage in the shortest possible time and improve the sewage treatment efficiency of the jet aerator.

Description

Technical Field

[0001] The invention belongs to the technical field of papermaking wastewater treatment equipment, and in particular relates to a jet aerator comprising multi-stage coaxial reverse blades and spliced ​​texture nozzles. Background Art

[0002] As a commonly used sewage treatment equipment, jet aerator plays a key role in practical work. Through the mixing of gas and liquid, the oxygen content of the water body is effectively increased. Filling the sewage in the aerobic biochemical pool with air can ensure the efficient growth of microorganisms in the sewage and the oxidation and degradation of polluting organic matter, thereby improving the sewage treatment effect. By stirring and disturbing the sewage, the activated sludge is kept in a suspended state, promoting mass transfer between microorganisms, polluting organic matter and oxygen, which helps to enhance the metabolic activity of microorganisms in the wastewater, remove polluting organic matter and other harmful substances in the water, and purify the water body.

[0003] Generally, a water pump injects liquid into the jet aerator through the water inlet pipe, thus forming a high-speed liquid column state. When the injected liquid passes through the suction chamber, a negative pressure area will be formed locally, prompting the gas to pass through the suction pipe and be introduced into the jet aerator. In the mixing and stirring process of the interaction between the airflow and the high-speed liquid, the mass, momentum and energy are effectively transferred inside the jet aerator, thus forming a continuous and turbulent gas-liquid two-phase flow mixing state. This gas-liquid two-phase flow is accelerated through the diffusion tube, and finally forms a high-speed jet shape with strong power, which fully stirs the sewage to achieve a better oxygenation effect.

[0004] At present, in order to improve the oxygenation effect and working efficiency of the jet aerator, the existing jet aerator usually adopts the method of increasing the water supply pressure and increasing the air supply flow rate, which will increase the energy consumption of the jet aerator and greatly increase the economic cost. Summary of the invention

[0005] The purpose of the present invention is to provide a jet aerator comprising multi-stage coaxial reverse blades and spliced ​​texture nozzles, which solves the problem in the prior art that the energy consumption of the jet aerator increases when the oxygenation effect of the jet aerator is improved.

[0006] The technical solution adopted by the present invention is: a jet aerator containing multi-stage coaxial reversing blades and spliced ​​texture nozzles, including a water inlet pipe, the inner wall of the water inlet pipe is connected to a plurality of shearing units along its length direction, one end of the water inlet pipe is connected to a first-level nozzle, the first-level nozzle is connected to a second-level nozzle through a circular tube, the outer wall of the circular tube is connected to an air suction chamber, the second-level nozzle is arranged in the air suction chamber, the outer wall of the air suction chamber is connected to the air suction pipe, the end of the air suction chamber away from the circular tube is connected to a mixing chamber, the inner wall of the mixing chamber is connected to a coaxial reversing mechanism, the coaxial reversing mechanism is connected to a rotating unit, and the end of the mixing chamber away from the air suction chamber is connected to the spliced ​​texture nozzle through a flange.

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

[0008] The shearing unit comprises a triangular bracket, the three vertices of which are connected to rotating blades via connecting shafts, the three sides of which are connected to connecting rods, and the ends of the connecting rods away from the triangular bracket are connected to the inner wall of the water inlet pipe.

[0009] The inner wall of the air suction pipe is connected with a first mesh screen and a second mesh screen which are arranged in parallel with each other, and the second mesh screen is arranged close to the air suction chamber.

[0010] The coaxial reversal mechanism is connected to the inner wall of the mixing chamber through a bracket, and the first rotating shaft and the second rotating shaft are respectively connected to the opposite sides of the coaxial reversal mechanism, and the ends of the first rotating shaft and the second rotating shaft away from the coaxial reversal mechanism are connected to the inner wall of the mixing chamber through the rotating shaft bracket, and the rotating unit is connected to the first rotating shaft and the second rotating shaft.

[0011] The rotating unit comprises a plurality of first four-stage gradual rotating blades, which are arranged along the length direction of the shaft body of the first rotating shaft, and the shaft body of the second rotating shaft is evenly connected with a plurality of second four-stage gradual rotating blades along its length direction.

[0012] The coaxial reversing mechanism includes a first bevel gear, which is connected to one end of the first rotating shaft through a second fastening screw, the shaft body of the first rotating shaft is connected to a first bearing, the outer ring of the first bearing is connected to a first end cover, the end of the second rotating shaft close to the first rotating shaft is connected to a third bevel gear through a first fastening screw, the shaft body of the second rotating shaft is connected to a second bearing, the outer ring of the second bearing is connected to the third end cover, the first bevel gear and the third bevel gear are arranged opposite to each other, the second bevel gear and the fourth bevel gear are meshingly connected between the first bevel gear and the third bevel gear, the second bevel gear and the fourth bevel gear are arranged opposite to each other, the second bevel gear and the fourth bevel gear are respectively connected to the third bearing and the fourth bearing on the sides away from each other, the outer ring of the third bearing is connected to the second end cover through the second end cover screw, and the outer ring of the fourth bearing is connected to the fourth end cover through the fourth end cover screw.

[0013] The first end cover is connected to the first shell by the first end cover screw, a first sealing ring is connected between the first end cover and the first rotating shaft, the third end cover is connected to the second shell by the third end cover screw, a second sealing ring is connected between the third end cover and the second rotating shaft, the second end cover is connected to the second shell by the second end cover screw, the fourth end cover is connected to the second shell by the fourth end cover screw, the first shell and the second shell are connected by shell screws, and the outer walls of the first shell and the second shell are connected to the bracket.

[0014] A fourth gasket is arranged between the first end cover screw and the first housing, a second fastening screw gasket is arranged between the second fastening screw and the first rotating shaft, a second flat key is also connected between the first rotating shaft and the first bevel gear, a first gasket is arranged between the second end cover and the second housing, a third gasket is arranged between the fourth end cover and the second housing, a second gasket is arranged between the third end cover screw and the second housing, a first fastening screw gasket is arranged between the first fastening screw and the second rotating shaft, and the second rotating shaft is also connected to the third bevel gear through the first flat key.

[0015] The spliced ​​texture nozzle includes a first texture nozzle, a second texture nozzle, a third texture nozzle and a fourth texture nozzle. The first texture nozzle, the second texture nozzle, the third texture nozzle and the fourth texture nozzle are arranged alternately. The first texture nozzle, the second texture nozzle, the third texture nozzle and the fourth texture nozzle are connected by a split nozzle flange. The side of the flange away from the mixing chamber is connected to one end of the first texture nozzle, the second texture nozzle, the third texture nozzle and the fourth texture nozzle.

[0016] The cross-sections of the first texture nozzle, the second texture nozzle, the third texture nozzle and the fourth texture nozzle are all arranged as arc structures, the inner wall of the first texture nozzle is evenly connected with a plurality of cubic textures, the inner wall of the second texture nozzle is evenly connected with staggered hemispherical textures and cubic textures, the inner wall of the third texture nozzle is evenly connected with staggered triangular prism textures, hemispherical textures and cubic textures, and the inner wall of the fourth texture nozzle is evenly connected with staggered cylindrical textures, triangular prism textures, hemispherical textures and cubic textures.

[0017] The beneficial effects of the present invention are:

[0018] The jet aerator with multi-stage coaxial reverse blades and spliced ​​textured nozzles uses a four-layer equilateral triangle bracket with small rotating blades inside the water inlet pipe. The staggered arrangement of the rotating blades and the circumferential angle of the bracket can maximize the mixing effect of the liquid in the water inlet pipe. Multiple rotating blades can fully stir and shear the sewage flowing into the jet aerator, which plays an important role in refining large particles and flocs in the sewage. The particles and flocs are cut smaller and finer, and the contact area with aerobic microorganisms in the sewage is increased, which is conducive to the decomposition of impurities in the water by aerobic microorganisms. The circumferential staggered design of the equilateral triangle bracket effectively increases the turbulence intensity inside the liquid, can achieve sewage refinement in the shortest possible time, and improve the sewage treatment efficiency of the jet aerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the secondary nozzle in the present invention;

[0021] Figure 3 A cross-sectional view of the overall structure of the present invention;

[0022] Figure 4 A half-section view of a water inlet pipe and an air inlet pipe in the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the rotating blade and the triangular support in the present invention;

[0024] Figure 6 for Figure 3 A magnified view of the internal structure at center A;

[0025] Figure 7 It is a schematic diagram of the connection structure of the multi-stage coaxial reversing mechanism in the present invention;

[0026] Figure 8 It is a structural schematic diagram of the coaxial reversal mechanism in the present invention;

[0027] Fig. 9 It is a cross-sectional schematic diagram of the coaxial reversal mechanism in the present invention;

[0028] Fig.10 It is a schematic diagram of the structure of the spliced ​​texture nozzle in the present invention;

[0029] Fig.11 It is a schematic diagram of the expansion of the spliced ​​texture nozzle in the present invention.

[0030] In the figure: 1. water inlet pipe, 2. triangular bracket, 3. rotating blade, 4. first-stage nozzle, 5. round tube, 6. suction pipe, 7. first-layer mesh screen, 8. second-layer mesh screen, 9. second-stage nozzle, 10. suction chamber, 11. mixing chamber, 12. flange, 13. split nozzle flange, 14. spliced ​​texture nozzle, 15. rotating shaft bracket, 16. first four-stage gradual rotating blade, 17. bracket, 18. coaxial reversing mechanism, 19. second four-stage gradual rotating blade, 20. first rotating shaft, 21. first end cover, 22. first bevel gear, 23. first bearing, 24. first housing, 25. second housing, 26. second bearing, 27. second bevel gear, 28. third bevel gear, 29. fourth bearing, 30. third bearing, 31. second rotating shaft, 32. fourth bevel gear , 33. Second end cover, 34. Third end cover, 35. Cube texture, 36. Hemispherical texture, 37. First texture nozzle, 38. Second texture nozzle, 39. Third texture nozzle, 40. Fourth texture nozzle, 41. Triangular prism texture, 42. Cylindrical texture, 43. Connecting rod, 44. Fourth end cover, 45. First fastening screw, 46. Second fastening screw, 47. First end cover screw, 48. Second end cover screw, 49. Third end cover screw, 50. Fourth end cover screw, 51. First sealing ring, 52. Second sealing ring, 53. Shell screw, 54. Second fastening screw gasket, 55. First gasket, 56. Third gasket, 57. Second gasket, 58. First flat key, 59. Second flat key, 60. Fourth gasket, 61. First fastening screw gasket. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] A jet aerator with multi-stage coaxial counter-rotating blades and spliced ​​textured nozzles, such as Figure 1As shown, it includes a water inlet pipe 1, the inner wall of which is connected to a plurality of shearing units along its length direction, one end of the water inlet pipe 1 is connected to a first-level nozzle 4, the first-level nozzle 4 is connected to a second-level nozzle 9 through a circular tube 5, the outer wall of the circular tube 5 is connected to an air suction chamber 10, the second-level nozzle 9 is arranged in the air suction chamber 10, the outer wall of the air suction chamber 10 is connected to an air suction pipe 6, the end of the air suction chamber 10 away from the circular tube 5 is connected to a mixing chamber 11, the inner wall of the mixing chamber 11 is connected to a coaxial reversing mechanism 18, the coaxial reversing mechanism 18 is connected to a rotating unit, and the end of the mixing chamber 11 away from the air suction chamber 10 is connected to a spliced ​​texture nozzle 14 through a flange 12. Sewage enters from the water inlet pipe 1, and is fully stirred and sheared by the shearing unit to refine large particles and flocs in the sewage. The particles and flocs are cut smaller and finer, and the contact area with aerobic microorganisms in the sewage is increased, which is conducive to the decomposition of impurities in the water by aerobic microorganisms. After being stirred by the shearing unit, it passes through the primary nozzle 4, the circular tube 5 and the secondary nozzle 9 in sequence to enter the suction chamber 10. The air enters the suction chamber 10 from the suction pipe 6 and mixes with the sewage. Then, the air and liquid are fully mixed through the coaxial reversing mechanism 18 in the mixing chamber 11. The coaxial reversing mechanism 18 is turned on. The rotating unit promotes the breaking of large bubbles into smaller bubbles, thereby increasing the specific surface area of ​​gas-liquid contact, which can promote the solubility of gas in water, improve the oxygen transfer rate, and facilitate aerobic microorganisms to attach to suspended matter and wastewater organic matter and degrade them into smaller organic molecules. The gas-liquid mixture is then passed through the spliced ​​texture nozzle 14 to further promote the mixing degree of the gas-liquid two phases, so that the aerobic microorganisms in the gas-liquid mixture can improve the ability to degrade organic matter, nitrogen oxides and filter out suspended matter, which can effectively remove pollutants in the water and improve the water quality and treatment efficiency after sewage treatment.

[0033] like Figure 2 As shown, the primary nozzle 4 is a conical structure, and the cross section of the secondary nozzle 9 is a spiral cross shape. The spiral cross-shaped secondary nozzle 9 is connected to the round tube 5 by a thread, so as to realize secondary pressurization of the liquid flowing into the water inlet pipe 1. When the liquid in the water inlet pipe 1 passes through the combined action of the primary and secondary nozzles, a high-pressure rotating scattered flow is finally formed at the mouth of the spiral cross-shaped secondary nozzle. The water flow rotates along the spiral line and disperses into jet states in multiple directions, which can effectively drive the multi-stage coaxial reverse blades in the mixing chamber 11 to rotate. At the same time, the high-pressure jet at the spiral cross-shaped nozzle can form a negative pressure area in the suction chamber 10, which promotes more gas to be pumped into the suction chamber 10 by negative pressure.

[0034] Example 1

[0035] like Figure 3-5As shown, the shearing unit includes a triangular bracket 2, the three vertices of the triangular bracket 2 are connected to rotating blades 3 through connecting shafts, the three sides of the triangular bracket 2 are connected to connecting rods 43, and the ends of the connecting rods 43 away from the triangular bracket 2 are connected to the inner wall of the water inlet pipe 1. Four triangular brackets 2 are arranged from left to right in the water inlet pipe 1, and the triangular brackets 2 are equilateral triangles. The circumferential angles of the rotating blades 3 on the first two triangular brackets 2 and the triangular brackets 2 connected thereto are 60° and 120° respectively, and the circumferential angles of the rotating blades 3 on the last two triangular brackets 2 and the triangular brackets 2 connected thereto are both 180°. The staggered arrangement of the triangular brackets 2 with rotating blades 3 can increase the turbulence of the liquid in the water inlet pipe 1, shear disturbance the sewage flowing into the jet aerator, and shear the large particles and flocs in the sewage into smaller particles and flocs.

[0036] The inner wall of the air intake pipe 6 is connected with two first mesh screens 7 and second mesh screens 8 arranged in parallel with each other, and the second mesh screen 8 is arranged near the air intake chamber 10. The air intake chamber 10 is a closed environment with a certain space, and the upper part of the air intake chamber 10 is connected to the air intake pipe 6. Two layers of mesh screens are arranged inside the air intake pipe 6. The mesh screens divide and rectify the gas sucked into the air intake chamber 10, and air is supplied into the jet aeration device by air supply equipment such as a blower. The pressurized air and the sewage / sludge mixture are violently contacted and mixed inside the aerator, thereby achieving the purpose of oxygenating the water body.

[0037] Example 2

[0038] like Figure 6 As shown, the coaxial reversing mechanism 18 is connected to the inner wall of the mixing chamber 11 through the bracket 17, and the first rotating shaft 20 and the second rotating shaft 31 are respectively connected to the opposite sides of the coaxial reversing mechanism 18, and the ends of the first rotating shaft 20 and the second rotating shaft 31 away from the coaxial reversing mechanism 18 are connected to the inner wall of the mixing chamber 11 through the rotating shaft bracket 15, and the rotating unit is connected to the first rotating shaft 20 and the second rotating shaft 31. The first rotating shaft 20 and the second rotating shaft 31 are coaxially arranged, and driven by the coaxial reversing mechanism 18, the rotation directions are opposite.

[0039] like Figure 7As shown, the rotating unit includes a plurality of first four-stage gradual rotating blades 16, which are arranged along the length direction of the shaft body of the first rotating shaft 20, and the shaft body of the second rotating shaft 31 is evenly connected with a plurality of second four-stage gradual rotating blades 19 along its length direction. The first four-stage gradual rotating blades 16 and the second four-stage gradual rotating blades 19 increase in size from left to right, forming a wedge-shaped convergent channel inside the mixing chamber 11. When the gas-liquid mixture passes through this wedge-shaped convergent channel, the space it passes through gradually shrinks, which will cause the pressure of the gas-liquid mixture passing through the wedge-shaped convergent channel to gradually increase. When the bubbles in the gas-liquid mixture are subjected to the increased pressure, this pressurization effect can promote the solubility of the gas in water, thereby improving the oxygen transfer rate.

[0040] Example 3

[0041] like Figure 8-9 As shown, the coaxial reversing mechanism 18 includes a first bevel gear 22, the first bevel gear 22 is connected to one end of the first rotating shaft 20 through a second fastening screw 46, the shaft body of the first rotating shaft 20 is connected with a first bearing 23, the outer ring of the first bearing 23 is connected with a first end cover 21, the end of the second rotating shaft 31 close to the first rotating shaft 20 is connected with a third bevel gear 28 through a first fastening screw 45, the shaft body of the second rotating shaft 31 is connected with a second bearing 26, the outer ring of the second bearing 26 is connected with a third end cover 34, and the first bevel gear 28 is connected to the first rotating shaft 20. The wheel 22 and the third bevel gear 28 are arranged opposite to each other, and the second bevel gear 27 and the fourth bevel gear 32 are meshed and connected between the first bevel gear 22 and the third bevel gear 28. The second bevel gear 27 and the fourth bevel gear 32 are arranged opposite to each other, and the third bearing 30 and the fourth bearing 29 are respectively connected to the sides of the second bevel gear 27 and the fourth bevel gear 32 away from each other. The outer ring of the third bearing 30 is connected to the second end cover 33 through the second end cover screw 48, and the outer ring of the fourth bearing 29 is connected to the fourth end cover 44 through the fourth end cover screw 50. When the high-speed jet impacts the first four-stage gradual rotating blade 16, the kinetic energy of the impact will be converted into mechanical energy for the blade rotation, and the first rotating shaft 20 starts to rotate, driving the first bevel gear 22 to rotate, and the first bevel gear 22 is meshed with the second bevel gear 27 and the fourth bevel gear 32, and the second bevel gear 27 and the fourth bevel gear 32 are meshed with the third bevel gear 28, and the first bevel gear 22 drives the third bevel gear 28 to rotate in the opposite direction through the second bevel gear 27 and the fourth bevel gear 32, and the third bevel gear 28 drives the second rotating shaft 31 to rotate, that is, the rotation directions of the first rotating shaft 20 and the second rotating shaft 31 are opposite, so that the first four-stage gradual rotating blade 16 and the second four-stage gradual rotating blade 19 rotate in opposite directions, and the complex flow generated by the forward and reverse rotation of the blade group will form a stronger turbulent state, and the dispersion and movement of bubbles in the turbulent flow will further enhance the mixing and transfer between the two phases.

[0042] The first end cover 21 is connected to the first housing 24 through the first end cover screw 47, a first sealing ring 51 is connected between the first end cover 21 and the first rotating shaft 20, the third end cover 34 is connected to the second housing 25 through the third end cover screw 49, a second sealing ring 52 is connected between the third end cover 34 and the second rotating shaft 31, the second end cover 33 is connected to the second housing 25 through the second end cover screw 48, the fourth end cover 44 is connected to the second housing 25 through the fourth end cover screw 50, the first housing 24 and the second housing 25 are connected through the housing screw 53, and the outer walls of the first housing 24 and the second housing 25 are both connected to the bracket 17. The first bearing 23 is fixed in the first housing 24, the second bearing 26, the third bearing 30 and the fourth bearing 29 are all fixed in the second housing 25, and the first housing 24 and the second housing 25 are assembled into a complete housing, which serves as the housing of the coaxial reversing mechanism 18, wrapping the bevel gear set to prevent foreign matter from entering and affecting its transmission.

[0043] A fourth gasket 60 is provided between the first end cover screw 47 and the first housing 24, a second fastening screw gasket 54 is provided between the second fastening screw 46 and the first shaft 20, a second flat key 59 is further connected between the first shaft 20 and the first bevel gear 22, a first gasket 55 is provided between the second end cover 33 and the second housing 25, a third gasket 56 is provided between the fourth end cover 44 and the second housing 25, a second gasket 57 is provided between the third end cover screw 49 and the second housing, a first fastening screw gasket 61 is provided between the first fastening screw 45 and the second shaft 31, and the second shaft 31 is further connected to the third bevel gear 28 via the first flat key 58. The ends of the first shaft 20 and the second shaft 31 that are close to each other are conical surfaces with keyways, which are connected to the bevel gears via flat keys to ensure stability, and gaskets are provided at the connection points of the components to prevent wear.

[0044] Example 4

[0045] like Fig.10As shown, the spliced ​​texture nozzle 14 includes a first texture nozzle 37, a second texture nozzle 38, a third texture nozzle 39 and a fourth texture nozzle 40, and the first texture nozzle 37, the second texture nozzle 38, the third texture nozzle 39 and the fourth texture nozzle 40 are arranged alternately, and the first texture nozzle 37, the second texture nozzle 38, the third texture nozzle 39 and the fourth texture nozzle 40 are connected by a split nozzle flange 13, and the side of the flange 12 away from the mixing chamber 11 is connected to one end of the first texture nozzle 37, the second texture nozzle 38, the third texture nozzle 39 and the fourth texture nozzle 40. The four texture nozzles are connected as a whole through a split nozzle flange 13, and are connected to the end of the mixing chamber 11 through a flange plate 12. When the gas-liquid mixture passes through texture nozzles with different structures, due to the influence of the dynamic pressure effect and the flow around the column group, the flow direction and speed of the water will present different states on the texture surface. The dynamic pressure effect forms a dynamic pressure zone and a columnar vortex, which changes the flow field law in the jet aerator. Therefore, the four texture nozzles can be replaced, spliced, and staggered according to the different total amounts of suspended solids and chemical oxygen demand of sewage.

[0046] like Fig.11 As shown, the cross sections of the first texture nozzle 37, the second texture nozzle 38, the third texture nozzle 39 and the fourth texture nozzle 40 are all arranged in an arc-shaped structure, the inner wall of the first texture nozzle 37 is evenly connected with a plurality of cubic textures 35, the inner wall of the second texture nozzle 38 is evenly connected with staggered hemispherical textures 36 and cubic textures 35, the inner wall of the third texture nozzle 39 is evenly connected with staggered triangular prism textures 41, hemispherical textures 36 and cubic textures 35, and the inner wall of the fourth texture nozzle 40 is evenly connected with staggered cylindrical textures 42, triangular prism textures 41, hemispherical textures 36 and cubic textures 35. The inner walls of different texture nozzles are different texture combinations, and the texture nozzles can be spliced ​​arbitrarily according to different working conditions.

[0047] The working principle of the jet aerator of the present invention containing multi-stage coaxial reverse blades and spliced ​​texture nozzles is as follows:

[0048] Sewage enters from the water inlet pipe 1. Under the action of the rotating blades 3, the turbulence of the liquid is increased, and the sewage flowing into the jet aerator is sheared and disturbed, and the large particles and flocs in the sewage are sheared into smaller particles and flocs. Then, under the joint action of the first-stage nozzle 4 and the second-stage nozzle 9, a high-pressure rotating scattered flow is finally formed at the spiral cross-shaped second-stage nozzle mouth. The water flow rotates along the spiral line and disperses into jet states in multiple directions. Air is sent into the jet aeration device by air supply equipment such as a blower. After mixing with the liquid in the suction chamber 10, it enters the mixing chamber 11. When the gas-liquid mixture hits the first and fourth-stage gradual rotating blades 16, the kinetic energy of the impact will be converted The first rotating shaft 20 starts to rotate to generate mechanical energy for the rotation of the blades, driving the first bevel gear 22 to rotate. The first bevel gear 22 is meshed with the second bevel gear 27 and the fourth bevel gear 32. The second bevel gear 27 and the fourth bevel gear 32 are meshed with the third bevel gear 28. The first bevel gear 22 drives the third bevel gear 28 to rotate in the opposite direction through the second bevel gear 27 and the fourth bevel gear 32. The third bevel gear 28 drives the second rotating shaft 31 to rotate, that is, the rotation directions of the two rotating shafts 20 are opposite, so that the first four-stage gradient rotating blade 16 and the second four-stage gradient rotating blade 19 rotate in opposite directions, and then are ejected from the spliced ​​texture nozzle 14 formed by splicing four texture nozzles.

[0049] The jet aerator of the present invention contains multi-stage coaxial inverted blades and spliced ​​textured nozzles. A four-layer equilateral triangle bracket with small rotating blades is used inside the water inlet pipe. The staggered arrangement of the rotating blades and the bracket at the circumferential angle can maximize the mixing effect of the liquid in the water inlet pipe. The multiple rotating blades can fully stir and shear the sewage flowing into the jet aerator, which plays an important role in refining large particles and flocs in the sewage. The particles and flocs are cut into smaller and finer parts, and the contact area with aerobic microorganisms in the sewage is increased, which is beneficial to the decomposition of impurities in the water by aerobic microorganisms. The circumferential staggered design of the equilateral triangle bracket effectively increases the turbulence intensity inside the liquid, can achieve sewage refinement in the shortest possible time, and improve the sewage treatment efficiency of the jet aerator.

[0050] At the connection of the water inlet pipe, a primary nozzle and a secondary nozzle are set. The two nozzles are connected by a circular tube. The primary nozzle is conical, and the secondary nozzle is a spiral cross. The spiral cross-shaped secondary nozzle is connected to the circular tube by a thread, and the secondary nozzles of different structures can be replaced according to the change of operating conditions. This setting can realize secondary pressurization of the liquid flowing into the water inlet pipe. When the liquid in the water inlet pipe passes through the combined action of the primary and secondary nozzles, a high-pressure rotating scattered flow is finally formed at the mouth of the spiral cross-shaped secondary nozzle. The water flow rotates along the spiral line and disperses into jet states in multiple directions, which can effectively drive the multi-stage coaxial reverse blades in the mixing chamber to rotate. At the same time, the high-pressure jet at the spiral cross-shaped nozzle can form a negative pressure area in the suction chamber, promoting more gas to be pumped into the suction chamber by negative pressure.

[0051] In order to optimize the airflow characteristics of the suction duct, two layers of staggered spoiler screens are installed inside the suction pipe. When the gas flows through the screen, double rows of vortex lines with opposite rotation directions will appear periodically on both sides of the screen hole column. Initially, the two rows of vortex lines maintain their own forward motion, and then attract and interfere with each other, and then develop into a nonlinear vortex street. When this gas with vortex street effect enters the suction chamber, it can produce a violent collision with the liquid. The large vortex stirs the large bubbles, and the small vortex increases the microscopic mixing between the gas and the liquid. The turbulent kinetic energy of the gas and the liquid is increased, and the uniform mixing effect of the gas-liquid two-phase flow is improved.

[0052] A coaxial reversing mechanism with two sets of gradually changing rotating blades is arranged in the mixing chamber. The coaxial reversing mechanism is composed of a bevel gear set and a rotating shaft. Eight-stage rotating blades are installed on the rotating shaft of the mechanism, and each set contains four-stage gradually changing blades. The size of the four-stage rotating blades gradually increases along the flow direction, and a convergent wedge-shaped channel is formed inside the mixing chamber. When the gas-liquid mixture passes through the wedge-shaped channel, the space gradually shrinks, causing the pressure of the gas-liquid two-phase flow in the channel to gradually increase. The bubbles in the liquid will be subjected to pressure, which can promote the solubility of the gas in water and thus increase the oxygen transfer rate. When the high-speed jet impacts the first set of multi-stage rotating blades, the liquid impact kinetic energy is converted into the rotational mechanical energy of the blades. The first set of blades rotates, and the second set of blades rotates in the opposite direction to the first set of multi-stage blades through the bevel gear set of the coaxial reversing mechanism. The two sets of counter-rotating four-stage rotating blades shear the gas-liquid two-phase flow, and the larger bubbles will be cut into small bubbles. The gas-liquid mass transfer rate is inversely proportional to the bubble diameter, which increases the contact area between the bubbles and the sewage, and is more conducive to gas-liquid mass transfer. At the same time, the rotation of the blades will also generate pressure differences in the liquid, causing the gas in different areas to be continuously pressed in or pumped out. These pressure differences help to form a good circulation flow and improve the mixing efficiency. The local low-pressure area generated near the rotating blades can cause cavitation in the gas-liquid mixture, which helps to enhance the local mixing and mass transfer process. In this better oxygenated environment, aerobic microorganisms will attach to the organic matter in the suspended matter and wastewater, and the organic matter will be degraded into smaller organic molecules, which accelerates the growth of aerobic microorganisms.

[0053] The flange at the end of the mixing chamber is connected to four pieces of replaceable spliced ​​texture nozzles. The texture nozzles can replace the texture nozzle units of various shapes, styles, arrangement positions and size parameters according to the different total amount of suspended solids and the chemical oxygen demand of sewage. The inner wall of the replaceable spliced ​​texture nozzle is arranged with cube, cylinder, triangular prism and hemispherical texture. When the gas-liquid mixture passes through the composite texture of different structures, due to the influence of the dynamic pressure effect and the flow around the column group, the flow direction and speed of the water will show different states on the texture surface. The dynamic pressure effect forms a dynamic pressure zone, a columnar vortex, and changes the flow field law in the jet aerator. This nozzle structure can further promote the mixing degree of the gas-liquid two-phase. Therefore, under the combined action of the multi-stage rotating blades and the composite texture surface, the increasing turbulence intensity of the high-speed jet accelerates the relative velocity between the gas and the liquid, the air bubbles will experience rapid expansion and contraction, and the bubbles will break to form smaller bubbles, increasing the aeration efficiency. The aerobic microorganisms in the gas-liquid mixture can improve their ability to degrade organic matter, nitrogen oxides and filter out suspended solids, effectively remove pollutants in the water, and improve the water quality and treatment efficiency after sewage treatment.

Claims

1. A jet aerator comprising multi-stage coaxial inverted blades and spliced ​​textured nozzles, characterized in that: The invention comprises a water inlet pipe (1), wherein the inner wall of the water inlet pipe (1) is connected to a plurality of shearing units along its length direction, one end of the water inlet pipe (1) is connected to a primary nozzle (4), the primary nozzle (4) is connected to a secondary nozzle (9) via a circular tube (5), the outer wall of the circular tube (5) is connected to an air suction chamber (10), the secondary nozzle (9) is arranged in the air suction chamber (10), the outer wall of the air suction chamber (10) is connected to an air suction pipe (6), one end of the air suction chamber (10) away from the circular tube (5) is connected to a mixing chamber (11), the inner wall of the mixing chamber (11) is connected to a coaxial reversing mechanism (18), the coaxial reversing mechanism (18) is connected to a rotating unit, and the end of the mixing chamber (11) away from the air suction chamber (10) is connected to a spliced ​​texture nozzle (14) via a flange (12); The shearing unit comprises a triangular support (2), the three vertices of the triangular support (2) are connected to rotating blades (3) via connecting shafts, the three sides of the triangular support (2) are connected to connecting rods (43), and the end of the connecting rod (43) away from the triangular support (2) is connected to the inner wall of the water inlet pipe (1); The coaxial reversing mechanism (18) is connected to the inner wall of the mixing chamber (11) via a bracket (17); opposite sides of the coaxial reversing mechanism (18) are respectively connected to a first rotating shaft (20) and a second rotating shaft (31); ends of the first rotating shaft (20) and the second rotating shaft (31) away from the coaxial reversing mechanism (18) are connected to the inner wall of the mixing chamber (11) via a rotating shaft bracket (15); and the rotating unit is connected to the first rotating shaft (20) and the second rotating shaft (31); The spliced ​​texture nozzle (14) comprises a first texture nozzle (37), a second texture nozzle (38), a third texture nozzle (39) and a fourth texture nozzle (40); the first texture nozzle (37), the second texture nozzle (38), the third texture nozzle (39) and the fourth texture nozzle (40) are arranged in a staggered manner; the first texture nozzle (37), the second texture nozzle (38), the third texture nozzle (39) and the fourth texture nozzle (40) are connected via a split-flap nozzle flange (13); and a side of the flange (12) away from the mixing chamber (11) is connected to one end of the first texture nozzle (37), the second texture nozzle (38), the third texture nozzle (39) and the fourth texture nozzle (40); The cross-sections of the first texture nozzle (37), the second texture nozzle (38), the third texture nozzle (39) and the fourth texture nozzle (40) are all arranged in an arc-shaped structure; the inner wall of the first texture nozzle (37) is evenly connected with a plurality of cubic textures (35); the inner wall of the second texture nozzle (38) is evenly connected with staggered hemispherical textures (36) and cubic textures (35); the inner wall of the third texture nozzle (39) is evenly connected with staggered triangular prism textures (41), hemispherical textures (36) and cubic textures (35); and the inner wall of the fourth texture nozzle (40) is evenly connected with staggered cylindrical textures (42), triangular prism textures (41), hemispherical textures (36) and cubic textures (35).

2. The jet aerator comprising multi-stage coaxial counter-rotating blades and spliced ​​texture nozzles according to claim 1, characterized in that: The inner wall of the air suction pipe (6) is connected to two first mesh screens (7) and a second mesh screen (8) which are arranged parallel to each other, and the second mesh screen (8) is arranged close to the air suction chamber (10).

3. The jet aerator comprising multi-stage coaxial counter-rotating blades and spliced ​​texture nozzles according to claim 1, characterized in that: The rotating unit comprises a plurality of first four-stage gradually changing rotating blades (16), wherein the plurality of first four-stage gradually changing rotating blades (16) are arranged along the length direction of the shaft body of the first rotating shaft (20), and the shaft body of the second rotating shaft (31) is evenly connected with a plurality of second four-stage gradually changing rotating blades (19) along its length direction.

4. The jet aerator comprising multi-stage coaxial counter-rotating blades and spliced ​​texture nozzles according to claim 1, characterized in that: The coaxial reversing mechanism (18) comprises a first bevel gear (22), the first bevel gear (22) being connected to one end of a first rotating shaft (20) via a second fastening screw (46), the shaft body of the first rotating shaft (20) being connected to a first bearing (23) being sleeved thereon, the outer ring of the first bearing (23) being connected to a first end cover (21), the end of the second rotating shaft (31) close to the first rotating shaft (20) being connected to a third bevel gear (28) via a first fastening screw (45), the shaft body of the second rotating shaft (31) being sleeved thereon, the outer ring of the second bearing (26) being connected to a third end cover (34), the first bevel gear (28) being connected to the first rotating shaft (20) The wheel (22) and the third bevel gear (28) are arranged opposite to each other, the second bevel gear (27) and the fourth bevel gear (32) are meshedly connected between the first bevel gear (22) and the third bevel gear (28), the second bevel gear (27) and the fourth bevel gear (32) are arranged opposite to each other, the second bevel gear (27) and the fourth bevel gear (32) are respectively connected to the third bearing (30) and the fourth bearing (29) on the sides away from each other, the outer ring of the third bearing (30) is connected to the second end cover (33) via a second end cover screw (48), and the outer ring of the fourth bearing (29) is connected to the fourth end cover (44) via a fourth end cover screw (50).

5. The jet aerator comprising multi-stage coaxial counter-rotating blades and spliced ​​texture nozzles according to claim 4, characterized in that: The first end cover (21) is connected to the first housing (24) via a first end cover screw (47); a first sealing ring (51) is connected between the first end cover (21) and the first rotating shaft (20); the third end cover (34) is connected to the second housing (25) via a third end cover screw (49); a second sealing ring (52) is connected between the third end cover (34) and the second rotating shaft (31); the second end cover (33) is connected to the second housing (25) via a second end cover screw (48); the fourth end cover (44) is connected to the second housing (25) via a fourth end cover screw (50); the first housing (24) and the second housing (25) are connected via housing screws (53); and outer walls of the first housing (24) and the second housing (25) are both connected to the bracket (17).

6. The jet aerator comprising multi-stage coaxial counter-rotating blades and spliced ​​texture nozzles according to claim 5, characterized in that: A fourth gasket (60) is arranged between the first end cover screw (47) and the first housing (24), a second gasket (54) is arranged between the second fastening screw (46) and the first rotating shaft (20), a second flat key (59) is also connected between the first rotating shaft (20) and the first bevel gear (22), a first gasket (55) is arranged between the second end cover (33) and the second housing (25), a third gasket (56) is arranged between the fourth end cover (44) and the second housing, a second gasket (57) is arranged between the third end cover screw (49) and the second housing (25), a first gasket (61) is arranged between the first fastening screw (45) and the second rotating shaft (31), and the second rotating shaft (31) is also connected to the third bevel gear (28) via the first flat key (58).

Images