Submerged aeration device and aeration method

Abstract

The present application relates to sewage treatment technical field, especially to a kind of submersible aeration equipment and aeration method, comprising: air inlet pipe, submersible motor, air inlet chamber, gas mixing chamber, guide vane and base, the lower end of submersible motor is connected with the upper end of air inlet chamber, the lower end of air inlet chamber is connected with the upper end of gas mixing chamber, air inlet chamber inner cavity is communicated with gas mixing chamber inner cavity, base is set in the outer ring of gas mixing chamber lower end, guide vane is set in the center of gas mixing chamber lower end, the lower end of air inlet pipe is compatible with the upper end of air inlet chamber, air inlet pipe is communicated with air inlet chamber inner cavity, the upper end of air inlet pipe is exposed to water surface, still comprising: composite impeller and oxygenator, composite impeller is set on the lower end output shaft of submersible motor and located in the inner cavity of gas mixing chamber, the outer ring of oxygenator is compatible with the inner ring of composite impeller, and fixed on the lower end output shaft of submersible motor, the present application provides a kind of submersible aeration equipment and aeration method that can improve aeration effect and increase the dissolved oxygen efficiency of water body.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a submersible aeration device and aeration method. Background Technology

[0002] Submersible centrifugal aerators are widely used in sewage treatment and water aeration and oxygenation of rivers and lakes. The high-speed rotating impeller creates negative pressure in the mixing chamber, causing air on the water surface to pass through the air inlet pipe and the air inlet chamber in sequence, enter the mixing chamber to form a gas-water mixture, and then be sprayed out at high speed from the surrounding flow channels to oxygenate the water.

[0003] However, existing submersible centrifugal aerators have the following shortcomings:

[0004] 1. Less air is injected into the water, resulting in lower oxygen dissolution efficiency;

[0005] 2. The bubbles in the carbonated water mixture are relatively large, which limits the oxygen dissolution efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a submersible aeration device and aeration method to improve the aeration effect and increase the dissolved oxygen efficiency of water, thereby solving the technical problems existing in the background art.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A submersible aeration device includes: an air inlet pipe, a submersible motor, an air inlet chamber, a mixing chamber, guide vanes, and a base. The lower end of the submersible motor is connected to the upper end of the air inlet chamber, and the lower end of the air inlet chamber is connected to the upper end of the mixing chamber. The inner cavity of the air inlet chamber is in communication with the inner cavity of the mixing chamber. The base is disposed on the outer ring of the lower end of the mixing chamber. The guide vanes are disposed at the center of the lower end of the mixing chamber. The lower end of the air inlet pipe is adapted to the upper end of the air inlet chamber and is connected to the inner cavity of the air inlet chamber. The upper end of the air inlet pipe protrudes above the water surface. The device also includes: a compound impeller and an aerator. The compound impeller is disposed on the lower output shaft of the submersible motor and located in the inner cavity of the mixing chamber. The outer ring of the aerator is adapted to the inner ring of the compound impeller and is fixed on the lower output shaft of the submersible motor.

[0009] Furthermore, the composite impeller includes: a shaft hole, a hub, a disc, a first blade, and a second blade. The upper end of the disc is provided with a hub, and the hub has a shaft hole. The lower end of the disc is provided with a plurality of first blades and a plurality of second blades, which are arranged in a circumferential array. The number of first blades is equal to the number of second blades, and the plurality of first blades and the plurality of second blades are arranged alternately. A first flow channel is formed in the first blade, and a second flow channel is formed in the second blade. Both the first flow channel and the second flow channel are U-shaped groove structures with openings at the upper end and radially outer end, and vertically arranged on both sides.

[0010] Furthermore, the composite impeller also includes a flow divider hole, which is a through hole, and the flow divider hole is arranged on the inner end of the first blade and the second blade, wherein the inner diameter of the first blade is equal to the inner diameter of the second blade.

[0011] Furthermore, the aerator is a hollow rotating body, comprising: an upper straight section, an inclined section, a lower straight section, and a base plate. The lower end of the upper straight section is adapted to and fixedly connected to the upper end of the inclined section, and the upper end of the lower straight section is adapted to and fixedly connected to the lower end of the inclined section. The diameter of the upper straight section is equal to the diameter of the upper end of the inclined section, and the diameter of the lower straight section is equal to the diameter of the lower end of the inclined section. The base plate is disposed at the bottom of the lower straight section.

[0012] The upper straight section is a hollow cylinder, and the outer diameter of the upper straight section is adapted to the inner end of the first blade and the second blade. The circumference of the upper straight section is provided with a plurality of flow holes, which are adapted to the flow diversion holes on the first blade and the second blade. The number of flow holes is equal to the sum of the number of the first blade and the second blade.

[0013] The inclined section is a hollow frustum with a larger diameter at the upper end than at the lower end. A number of first aeration holes are densely distributed around the circumference of the inclined section. The axis of the first aeration hole is inclined and intersects the axis of the submersible motor. From the inside out, the axis of the first aeration hole is inclined downward. The diameter of the first aeration hole is 0.1 to 0.5 mm.

[0014] The lower straight section has a number of second aeration holes densely distributed in the circumferential direction. The axis of the second aeration holes is horizontally set and intersects with the axis of the submersible motor. The diameter of the second aeration holes is 0.1 to 0.5 mm.

[0015] Furthermore, the bottom end of the first blade is inclined with a sloping bottom surface, the sloping bottom surface is inclined at an angle α = 2 to 10°, the height of the tangential rear plane of the first blade is greater than the height of the tangential front plane of the first blade, and the rotation direction of the compound impeller is from the tangential rear plane to the tangential front plane; the bottom surface of the second blade is horizontally arranged.

[0016] Furthermore, a plurality of cutting grooves are provided on the bottom surface of the first blade, and the plurality of cutting grooves are arranged at intervals along the width direction of the first blade.

[0017] Furthermore, the height h1 of the first blade is greater than the height h2 of the second blade, and h1-h2 = 5-15mm; the lower end face of the aerator is located below the inclined bottom face of the first blade; the radially outer end of the first blade is flush with the side of the wheel, and the radially outer end of the second blade is located inside the side of the wheel and the distance between it and the side of the wheel is 5-25mm.

[0018] Furthermore, it also includes: an aeration pipe, wherein an aeration pipe is provided between adjacent first and second blades, and both ends of the aeration pipe are respectively connected to the first flow channel and the second flow channel; the aeration pipe is an arc-shaped pipe and its arc center is coaxial with the axis of the wheel; the upper part of the aeration pipe is clearance-fitted with the wheel; and a number of third aeration holes are densely distributed on the circumferential sidewall of the aeration pipe, wherein the diameter of the third aeration holes is 0.1 to 0.2 mm.

[0019] An aeration method includes the following steps:

[0020] 1. When the compound impeller rotates at high speed, the air above the water surface enters the mixing chamber through the air inlet pipe and air inlet chamber, and then enters the first flow channel and the second flow channel. Due to the negative pressure formed in the mixing chamber, the air in the first flow channel and the second flow channel is divided into three parts. Most of the air moves outward in the first flow channel and the second flow channel, a part of the air enters the aerator through the diversion hole, and another part of the air enters the aeration pipe.

[0021] 2. Air with a certain speed is sprayed outward and downward from the first aeration hole of the high-speed rotating aerator at an angle, and rotates under the action of centrifugal force, mixing with the water in the outer ring of the aerator to form a first air-water mixture in an inclined state. The second aeration hole sprays outward and rotates under the action of centrifugal force, forming a second air-water mixture sprayed horizontally with the water in the outer ring of the aerator.

[0022] Third, because the flow directions of the first and second air-water mixtures are not parallel and thus intersect, the two air-water mixtures cut and mix with each other in the circumferential direction of the outer ring of the aerator, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, forming the third air-water mixture. During the outward flow between the first and second blades, it continuously mixes, collides and cuts with the air sprayed in the circumferential direction by the aeration pipe in a three-dimensional manner, further making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, forming the fourth air-water mixture.

[0023] Fourth, the high-speed rotating first blade cuts the fourth carbonated water mixture again, making the water droplets and bubbles smaller and denser, thereby improving the dissolved oxygen efficiency; the cut part of the carbonated water mixture moves upward at an angle, colliding and mixing with the outward-moving carbonated water mixture again, forming a three-dimensional mixture, transferring more oxygen into the water;

[0024] 5. Because the height of the first blade is greater than that of the second blade, a portion of the fourth air-water mixture in front of the first blade is cut by the cutting groove under the action of the first blade and passes over the second blade into the space between the second blade and the first blade in front of the first blade, so that the two air-water mixtures after being cut by themselves mix and collide with each other, so that more oxygen dissolves in the water.

[0025] VI. The high-speed rotating first blade drives the water-air mixture in front of it to rotate. Since the radial outer end of the first blade is flush with the side of the wheel, and the radial outer end of the second blade is located inside the side of the wheel, when the water-air mixture moves in the direction of rotation, it is approximately perpendicular to the direction of air flowing outward from the second flow channel of the second blade. This causes the two fluids to cut and mix intensely, making the water droplets and bubbles smaller and denser, and allowing more oxygen to dissolve in the water. Most of the water-air mixture flows out of the mixing chamber, while a small amount of water-air mixture passes over the front end of the second blade and mixes again with the water-air mixture in front of the rotating second blade, further improving the oxygen transfer efficiency, and then flows out from the next flow channel of the mixing chamber.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] This invention employs a composite impeller and an aerator, which diverts a portion of the air entering the blade channel into the aerator. The air is then sprayed outward by the high-speed rotating aerator, forming a fine air-water mixture. Under the action of blades of different heights and outer diameters, the air-water mixture mixes and cuts with the air-water mixture formed by the remaining air flowing out of the blade channel, making the water droplets and bubbles even smaller and finer. This allows more oxygen to dissolve in the water, improving the aeration effect and dissolved oxygen efficiency. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the aeration device structure according to an embodiment of the present invention;

[0030] Figure 2This is a schematic diagram of the composite impeller structure according to an embodiment of the present invention;

[0031] Figure 3 This is a top view schematic diagram of the composite impeller according to an embodiment of the present invention;

[0032] Figure 4 This is a cross-sectional schematic diagram of the first blade according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the aerator structure according to an embodiment of the present invention;

[0034] Figure 6 This is a top view schematic diagram of the composite impeller in Example 2.

[0035] The labels in the attached diagram are as follows: 1-Inlet pipe, 2-Submersible motor, 3-Inlet chamber, 4-Mixing chamber, 5-Composite impeller, 51-Shaft hole, 52-Hub, 53-Disc, 54-First blade, 541-First flow channel, 542-Sloping bottom surface, 543-Tangential rear plane, 544-Tangential front plane, 55-Second blade, 551-Second flow channel, 56-Diverter hole, 57-Aeration pipe, 6-Aerator, 61-Upper straight section, 611-Flow passage hole, 62-Sloping section, 621-First aeration hole, 63-Lower straight section, 631-Second aeration hole, 64-Bottom plate, 65-Center hole, 7-Guide vane, 8-Base, α-Sloping bottom surface inclination angle, h1-First blade height, h2-Second blade height. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0037] Example 1:

[0038] like Figure 1 As shown, a submersible aeration device includes: an air inlet pipe 1, a submersible motor 2, an air inlet chamber 3, a mixing chamber 4, guide vanes 7, and a base 8. The lower end of the submersible motor 2 is connected to the upper end of the air inlet chamber 3, and the lower end of the air inlet chamber 3 is connected to the upper end of the mixing chamber 4. The inner cavity of the air inlet chamber 3 communicates with the inner cavity of the mixing chamber 4. The base 8 is located on the outer ring of the lower end of the mixing chamber 4. The guide vanes 7 are located at the center of the lower end of the mixing chamber 4 and are disc-shaped structures with a central opening. The lower end of the air inlet pipe 1 is adapted to the upper end of the air inlet chamber 3 and communicates with the inner cavity of the air inlet chamber 3. The upper end of the air inlet pipe 1 protrudes above the water surface. The device also includes: a compound impeller 5 and an aerator 6. The compound impeller 5 is located on the lower output shaft of the submersible motor 2 and is located in the inner cavity of the mixing chamber 4. The outer ring of the aerator 6 is adapted to the inner ring of the compound impeller 5 and is fixed on the lower output shaft of the submersible motor 2.

[0039] like Figure 2As shown, the compound impeller 5 includes: a shaft hole 51, a hub 52, a disc 53, first blades 54, and second blades 55. The upper end of the disc 53 is provided with the hub 52, on which the shaft hole 51 is formed. The lower end of the disc 53 is provided with a plurality of first blades 54 and a plurality of second blades 55, which are arranged in a circular array. The number of first blades 54 is equal to the number of second blades 55, and the plurality of first blades 54 and second blades 55 are arranged alternately. Preferably, the number of first blades 54 and second blades 55 is 3 to 4 each. Under the action of the high-speed rotating blades, adjacent first blades 54 and second blades 55... The water in the air chamber 4 mixes with the air entering the mixing chamber 5 to form a steam-water mixture on the outer ring of the composite impeller 5. The mixture is then discharged from the various channels of the mixing chamber 4 into the surrounding water for aeration and oxygenation. A first channel 541 is provided in the first blade 54, and a second channel 551 is provided in the second blade 55. Both the first channel 541 and the second channel 551 are U-shaped groove structures with openings at the top and radially outer ends and vertically arranged on both sides. Since there is an air passage at the connection between the impeller 53 and the first channel 541 and the second channel 551, when the composite impeller 5 rotates at high speed, the air above the water surface enters the mixing chamber 4 through the air inlet pipe 1 and the air inlet chamber 3, and then enters the channels of the first blade 54 and the second blade 55.

[0040] like Figure 3 As shown, the compound impeller 5 also includes a flow divider hole 56, which is a through hole. The flow divider hole 56 is arranged on the inner end of the first blade 54 and the second blade 55. The inner diameter of the first blade 54 is equal to the inner diameter of the second blade 55. When air enters the flow channel of the first blade 54 and the second blade 55, due to the negative pressure formed in the mixing chamber 4, the air in the flow channel is divided into two parts. Most of the air moves outward in the first flow channel 541 and the second flow channel 551, and a small part of the air flows outward in the direction of the inner ring (motor axis direction) through the flow divider hole 56.

[0041] like Figure 5 As shown, the aerator 6 is a hollow rotating body. The aerator 6 includes: an upper straight section 61, an inclined section 62, a lower straight section 63, and a base plate 64. The lower end of the upper straight section 61 is adapted to and fixedly connected to the upper end of the inclined section 62, and the upper end of the lower straight section 63 is adapted to and fixedly connected to the lower end of the inclined section 62. The diameter of the upper straight section 61 is equal to the diameter of the upper end of the inclined section 62, and the diameter of the lower straight section 63 is equal to the diameter of the lower end of the inclined section 62. The base plate 64 is located at the bottom of the lower straight section 63.

[0042] The upper straight section 61 is a hollow cylinder, and its outer diameter is adapted to the inner ends of the first blade 54 and the second blade 55. The upper straight section 61 has a number of flow holes 611 around its circumference, which are adapted to the flow diversion holes 56 on the first blade 54 and the second blade 55. The number of flow holes 611 is equal to the sum of the number of the first blade 54 and the second blade 55. Air enters the cavity of the aerator 6 from the flow channels of the first blade 54 and the second blade 55 through the flow diversion holes 56 and the flow holes 611.

[0043] The base plate 64 is a cylindrical thin plate with a central hole 65 in the center. The central hole 65 is adapted to the fasteners used to fix the compound impeller to ensure that the air entering the aerator 6 will not flow out from its gap.

[0044] The inclined section 62 is a hollow frustum with a larger diameter at the top than at the bottom. Several first aeration holes 621 are densely distributed around the circumference of the inclined section 62. The axes of the first aeration holes 621 are inclined and intersect the axis of the submersible motor 2. From the inside out, the axes of the first aeration holes 621 are inclined downwards. When air from the channels of the first blade 54 and the second blade 55 enters the aerator 6, air with a certain velocity is sprayed outwards and downwards from the first aeration holes 621 of the high-speed rotating aerator 6, mixing with the water in the outer ring of the aerator 6 to form an inclined first air-water mixture. The diameter of the first aeration holes 621 is 0.1–0.5 mm, thus forming a first air-water mixture containing tiny bubbles.

[0045] The lower straight section 63 has a number of second aeration holes 631 densely distributed in the circumferential direction. The axis of the second aeration holes 631 is horizontally set and intersects the axis of the submersible motor 2. Air in the flow channels of the first blade 54 and the second blade 55 enters the aerator 6. Air with a certain speed is ejected outward from the second aeration holes 631 of the high-speed rotating aerator 6, forming a horizontally ejected second air-water mixture with the water in the outer ring of the aerator 6. The diameter of the second aeration holes 631 is 0.1 to 0.5 mm, thus forming a second air-water mixture containing tiny bubbles.

[0046] The two streams of air-water mixture formed by the air jets from the first aeration hole 621 and the second aeration hole 631 intersect due to their non-parallel flow directions. Under the action of the rotating aerator 6, the two streams of air-water mixture undergo more intense mutual cutting and mixing in the circumferential direction of the outer ring of the aerator 6 than in static microporous aeration. This makes the water droplets and bubbles smaller and denser, transferring more oxygen to the water and forming a third air-water mixture, thereby improving dissolved oxygen efficiency. The rotating third air-water mixture continuously mixes and cuts with the surrounding water, increasing the air movement path and further making the water droplets and bubbles smaller and denser. At the same time, it creates conditions for improving the cutting effect of the inclined cutting groove at the lower part of the first blade 54 and enhancing the mutual cutting and mixing effect with the air jetted from the aeration pipe 57 in Scheme 2, and increases the collision intensity with the relative motion of different air-water mixtures.

[0047] The aerator offers the following advantages: First, it converts a portion of the large-diameter bubbles in the first and second flow channels 541 into microporous aeration, forming fine, dense bubbles with tiny diameters, thereby increasing the contact area between air and water and improving oxygen transfer efficiency. Second, the air-water mixture sprayed from different directions and heights cuts and mixes with each other, making the microbubbles even smaller and denser, further improving oxygen transfer efficiency. Third, the two streams of air from different directions merge into the water, and this air-water mixture serves as the driving fluid for the composite impeller 5, thereby increasing the amount of air entering the mixing chamber 4. Fourth, in the prior art, due to the spaced blades, air flows out intermittently from the blade channels, and the mixing range with the water is limited to the blade channels and located on the outer ring of the impeller, resulting in a small contact area between air and water, thus affecting dissolved oxygen efficiency. In this application, air is continuously sprayed from the 360° circumference of the aerator 6 (including between the blades) and a steam-water mixture is formed between the blades, which effectively increases the amount of air entering the mixing chamber. At the same time, more oxygen in the air entering the mixing chamber 4 is transferred to the water, effectively improving the oxygen transfer efficiency. Fifth, it creates conditions for the cutting groove at the bottom of the first blade 54 to cut the air bubbles.

[0048] The bottom end of the first blade 54 is inclined with a sloping bottom surface 542, the sloping bottom surface 542 is inclined at an angle α = 2 to 10°, the height of the tangential rear plane 543 of the first blade 54 is greater than the height of the tangential front plane 544 of the first blade 54, and the rotation direction of the compound impeller 5 is from the tangential rear plane 543 to the tangential front plane 544; the bottom surface of the second blade 55 is horizontally arranged.

[0049] The bottom surface of the first blade 54 has several cutting grooves, which are spaced apart along the width of the first blade 54. The cutting grooves cut the third soda-water mixture below, making the water droplets and bubbles smaller and denser, thereby improving the dissolved oxygen efficiency.

[0050] The height h1 of the first blade 54 is greater than the height h2 of the second blade 55, and h1-h2 = 5-15mm. Because the height of the first blade 54 is greater than that of the second blade 55, a portion of the third carbonated water mixture in front of the rotating first blade 54 is cut by the cutting groove and passes over the second blade 55, entering the space between the rotating second blade 55 and the first blade 54. This causes the two streams of carbonated water mixture, after being cut by their respective cutting processes, to mix and collide, resulting in more oxygen dissolving in the water. The lower end face of the aerator 6 is located below the inclined bottom surface 542 of the first blade 55 to ensure that more of the third carbonated water mixture is cut by the cutting groove. An upwardly inclined cutting groove (in the direction of rotation) causes a portion of the cut carbonated water mixture to change direction and move upwards, mixing again with the outwardly moving carbonated water mixture, thus allowing different... The air-water mixture is cut and mixed in a three-dimensional manner, further improving the oxygen transfer efficiency. The radial outer end of the first blade 54 is flush with the side of the wheel 53, and the radial outer end of the second blade 55 is located inside the side of the wheel 53 with a distance of 5-25mm from the side of the wheel 53. The advantage of this setting is that the high-speed rotating first blade 54 drives the air-water mixture in front of it to rotate. When the air-water mixture moves in the direction of rotation, it is approximately perpendicular to the direction of air movement flowing outward from the second flow channel 551 of the second blade 55. This causes the two fluids to cut and mix intensely, making the water droplets and bubbles smaller and denser, and allowing more oxygen to dissolve in the water. This overcomes the shortcomings of existing technologies where water and air are directly mixed in the flow channel of the mixing chamber (the outer diameter of the blade and the cavity of the mixing chamber are fitted with a very small gap), resulting in low oxygen dissolution efficiency. Most of the gas-water mixture flows out of the flow channel of the mixing chamber 4. A small amount of gas-water mixture passes over the front end of the second blade 55 and mixes again with the gas-water mixture in front of the rotating second blade 55, which further improves the oxygen transfer efficiency. Then it flows out from the next flow channel of the mixing chamber 4.

[0051] The aeration process using the aeration equipment provided in this embodiment is as follows:

[0052] 1. When the compound impeller 5 rotates at high speed, the high-speed rotation of the compound impeller 5 in the mixing chamber 4 propels water outward tangentially (flowing out from multiple channels in the mixing chamber 4), while simultaneously creating a negative pressure in the mixing chamber 4; the air above the water surface enters the mixing chamber 4 through the air inlet pipe 1 and the air inlet chamber 3, and then enters the first channel 541 and the second channel 551; due to the negative pressure formed in the mixing chamber 4, the air in the first channel 541 and the second channel 551 is divided into two parts, most of the air moves outward in the first channel 541 and the second channel 551, and the other part of the air enters the aerator 6 through the diversion hole 56;

[0053] Second, air with a certain speed is sprayed outward and downward at an angle from the first aeration hole 621 of the high-speed rotating aerator 6, and rotates under the action of centrifugal force, mixing with the water in the outer ring of the aerator 6 to form a first air-water mixture in an inclined state. The second aeration hole 631 sprays outward and rotates under the action of centrifugal force, forming a second air-water mixture sprayed horizontally with the water in the outer ring of the aerator 6.

[0054] Third, because the flow directions of the first and second soda-water mixtures are not parallel and thus intersect, the two soda-water mixtures cut and mix with each other in the circumferential direction of the outer ring of the aerator 6, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, forming the third soda-water mixture, thereby improving the dissolved oxygen efficiency.

[0055] Fourth, the cutting groove at the bottom of the first blade 54 cuts the third carbonated water mixture below, making the water droplets and bubbles smaller and denser, thereby improving the dissolved oxygen efficiency; the cut part of the carbonated water mixture moves upward at an angle, colliding and mixing with the outward moving carbonated water mixture again, forming a three-dimensional mixture, transferring more oxygen into the water;

[0056] 5. Since the height of the first blade 54 is greater than the height of the second blade 55, a portion of the third steam-water mixture in front of the first blade 54 is cut by the cutting groove under the action of the first blade 54 and passes over the second blade 55 into the space between the second blade 55 and the first blade 54 in front of the first blade, so that the two streams of steam-water mixture after being cut by themselves mix and collide with each other, so that more oxygen dissolves in the water.

[0057] VI. The high-speed rotating first blade 54 drives the water-air mixture in front of it to rotate. Since the radial outer end of the first blade 54 is flush with the side of the wheel 53, and the radial outer end of the second blade 55 is located inside the side of the wheel 53, when the water-air mixture moves in the direction of rotation, it is approximately perpendicular to the direction of air flowing outward from the second flow channel 551 of the second blade 55. This causes the two fluids to cut and mix intensely with each other, making the water droplets and bubbles smaller and denser, and allowing more oxygen to dissolve in the water. Most of the water-air mixture flows out of the flow channel of the mixing chamber 4, and a small amount of water-air mixture crosses the front end of the second blade 55 and mixes again with the water-air mixture in front of the rotating second blade 55, further improving the oxygen transfer efficiency, and then flows out from the next flow channel of the mixing chamber 4.

[0058] Example 2:

[0059] This embodiment is an improvement on Embodiment 1, specifically as follows: An aeration pipe 57 is provided between adjacent first blades 54 and second blades 55, with both ends of the aeration pipe 57 connected to the first flow channel 541 and the second flow channel 551 respectively; the aeration pipe 57 is an arc-shaped pipe with its arc center coaxial with the axis of the impeller 53; the upper part of the aeration pipe 57 is clearance-fitted with the impeller 53; several third aeration holes are densely distributed on the circumferential sidewall of the aeration pipe 57, with the diameter of the third aeration holes being 0.1 to 0.2 mm; when the high-speed rotating composite impeller 5 generates negative pressure in the mixing chamber 4, air above the water surface enters the first flow channel 541 and the second flow channel 551 of the impeller, and then enters the aeration pipe 57 through the air outlet on the side of the flow channel, spraying air outward in the circumferential direction.

[0060] Based on Example 1, the air in the first flow channel 541 and the second flow channel 551 is divided into three parts due to the negative pressure formed in the mixing chamber 4. Most of the air moves outward in the first and second flow channels, a part of the air enters the aerator 6 through the diversion hole 56, and another part of the air enters the aeration pipe 57.

[0061] The first and second air-water mixtures, formed by the air ejected from the aerator 6, cut each other to form a third air-water mixture. As this mixture flows outward between the blades, it continuously mixes, collides, and cuts with the air ejected circumferentially from the aeration pipe 57, further reducing the size and density of water droplets and bubbles, thus transferring more oxygen into the water; forming a fourth air-water mixture. Simultaneously, the high-speed rotating first blade 54 cuts the fourth air-water mixture again; the cut portion moves upward at an angle, colliding and mixing again with the outward-moving mixture, creating a three-dimensional mixture and transferring more oxygen into the water. On one hand, because the height of the first blade 54 is greater than that of the second blade 55, a portion of the fourth air-water mixture in front of the rotating first blade 54 is cut by the cutting groove and passes over the second blade 55, entering the space between the rotating second blade 55 and the first blade 54. This causes the two streams of air-water mixture, after being cut by their respective cutting processes, to mix and collide, dissolving more oxygen in the water. On the other hand, since the radially outer end of the first blade 54 is flush with the side of the wheel 53, and the radially outer end of the second blade 55 is located inside the side of the wheel 53, when the water-air mixture moves in the direction of rotation, it is approximately perpendicular to the direction of air flowing outward from the second flow channel 551 of the second blade 55. This causes the two fluids to violently cut and mix with each other, making the water droplets and bubbles smaller and denser, and allowing more oxygen to dissolve in the water. Most of the water-air mixture flows out of the flow channel of the mixing chamber 4, and a small amount of water-air mixture crosses the front end of the second blade 55 and mixes again with the water-air mixture in front of the rotating second blade 55, further improving the oxygen transfer efficiency, and then flows out from the next flow channel of the mixing chamber 4.

[0062] Example 3:

[0063] This embodiment is an improvement on Embodiment 1. Specifically, the improvements are as follows: the first flow channel 541 and the second flow channel 551 do not have diversion holes 56, and the aerator 6 is not provided; an aeration pipe 57 is provided between adjacent first blades 54 and second blades 55, and the two ends of the aeration pipe 57 are respectively connected to the first flow channel 541 and the second flow channel 551; the aeration pipe 57 is an arc-shaped pipe and its arc center is coaxial with the axis of the wheel 53; the upper part of the aeration pipe 57 is clearance-fitted with the wheel 53; a number of third aeration holes are densely distributed on the circumferential sidewall of the aeration pipe 57, and the diameter of the third aeration holes is 0.1 to 0.2 mm.

[0064] The air in the first flow channel 541 and the second flow channel 551 is divided into two parts due to the negative pressure formed in the mixing chamber. Most of the air moves outward in the first and second flow channels 541 and 551, while a small portion enters the aeration pipe 57. The aeration pipe 57 sprays very small diameter air in a circumferential direction between the blades, achieving three-dimensional mixing and forming a fine air-water mixture, transferring more oxygen into the water. Simultaneously, the high-speed rotating first blade 54 cuts the air-water mixture. The cut portion of the air-water mixture moves upward at an angle, colliding and mixing again with the outward-moving air-water mixture, forming a three-dimensional mixture and transferring more oxygen into the water. On the other hand, because the height of the first blade 54 is greater than that of the second blade 55, a portion of the air-water mixture in front of the rotating first blade 54 is cut by the cutting groove and passes over the second blade 55, entering the space between the rotating second blade 55 and the first blade 54. This causes the two streams of air-water mixture, after being cut by their respective cutting processes, to mix and collide, dissolving more oxygen in the water. On the other hand, since the radially outer end of the first blade 54 is flush with the side of the wheel 53, and the radially outer end of the second blade 55 is located inside the side of the wheel 53, the air-water mixture moves in the direction of rotation and is approximately perpendicular to the direction of air flowing outward from the second flow channel 551 of the second blade 55. This causes the two fluids to violently cut and mix with each other, making the water droplets and bubbles smaller and denser, and allowing more to dissolve in the water. Most of the air-water mixture flows out of the flow channel of the mixing chamber 4, and a small amount of air-water mixture crosses the front end of the second blade 55 and mixes again with the air-water mixture in front of the rotating second blade 55, further improving the oxygen transfer efficiency, and then flows out from the next flow channel of the mixing chamber 4.

[0065] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the technical solution of the present invention, based on the technical essence of the present invention, shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A submersible aeration device, comprising: The submersible motor (2), air intake chamber (3), mixing chamber (4), guide vane (7), and base (8) are connected. The lower end of the submersible motor (2) is connected to the upper end of the air intake chamber (3), and the lower end of the air intake chamber (3) is connected to the upper end of the mixing chamber (4). The inner cavity of the air intake chamber (3) is connected to the inner cavity of the mixing chamber (4). The base (8) is located on the outer ring of the lower end of the mixing chamber (4). The guide vane (7) is located at the center of the lower end of the mixing chamber (4). The air intake pipe (1) is connected to the upper end of the mixing chamber (4). The lower end of the air inlet (1) is adapted to the upper end of the air inlet chamber (3), the air inlet pipe (1) is connected to the inner cavity of the air inlet chamber (3), and the upper end of the air inlet pipe (1) is exposed above the water surface. The feature is that it also includes: a compound impeller (5) and an aerator (6). The compound impeller (5) is set on the lower output shaft of the submersible motor (2) and located in the inner cavity of the mixing chamber (4). The outer ring of the aerator (6) is adapted to the inner ring of the compound impeller (5) and is fixed on the lower output shaft of the submersible motor (2). The composite impeller (5) includes: a shaft hole (51), a hub (52), a disc (53), a first blade (54), and a second blade (55). The upper end of the disc (53) is provided with a hub (52), and the hub (52) is provided with a shaft hole (51). The lower end of the disc (53) is provided with a plurality of first blades (54) and a plurality of second blades (55). The plurality of first blades (54) and the plurality of second blades (55) are arranged in a circular array. The number of first blades (54) is equal to the number of second blades (55), and the plurality of first blades (54) and the plurality of second blades (55) are arranged alternately. A first flow channel (541) is provided in the first blade (54), and a second flow channel (551) is provided in the second blade (55). The first flow channel (541) and the second flow channel (551) are both U-shaped groove structures with openings at the upper end and radial outer end and vertical arrangement on both sides. The composite impeller (5) further includes: a flow divider hole (56), which is a through hole. The flow divider hole (56) is arranged on the inner end of the first blade (54) and the second blade (55). The inner diameter of the first blade (54) is equal to the inner diameter of the second blade (55). The aerator (6) is a hollow rotating body. The aerator (6) includes: an upper straight section (61), an inclined section (62), a lower straight section (63), and a base plate (64). The lower end of the upper straight section (61) is adapted to and fixedly connected to the upper end of the inclined section (62). The upper end of the lower straight section (63) is adapted to and fixedly connected to the lower end of the inclined section (62). The diameter of the upper straight section (61) is equal to the diameter of the upper end of the inclined section (62). The diameter of the lower straight section (63) is equal to the diameter of the lower end of the inclined section (62). The base plate (64) is located at the bottom of the lower straight section (63). The upper straight section (61) is a hollow cylinder, and the outer diameter of the upper straight section (61) is adapted to the inner end of the first blade (54) and the second blade (55); the circumference of the upper straight section (61) is provided with a plurality of flow holes (611), and the flow holes (611) are adapted to the flow diversion holes (56) on the first blade (54) and the second blade (55). The number of flow holes (611) is equal to the sum of the number of the first blade (54) and the second blade (55); The inclined section (62) is a hollow frustum with a larger diameter at the upper end than at the lower end. The inclined section (62) is densely covered with a number of first aeration holes (621) in the circumferential direction. The axis of the first aeration hole (621) is inclined and intersects the axis of the submersible motor (2). From the inside out, the axis of the first aeration hole (621) is inclined downward. The diameter of the first aeration hole (621) is equal to 0.1~0.5mm. The lower straight section (63) is densely covered with a number of second aeration holes (631) in the circumferential direction. The axis of the second aeration hole (631) is set horizontally and intersects with the axis of the submersible motor (2). The diameter of the second aeration hole (631) is 0.1~0.5mm.

2. The submersible aeration device according to claim 1, characterized in that: The bottom end of the first blade (54) is inclined with a sloping bottom surface (542), the sloping bottom surface (542) has an inclination angle α = 2 ~ 10°, the height of the tangential rear plane (543) of the first blade (54) is greater than the height of the tangential front plane (544) of the first blade (54), and the rotation direction of the composite impeller (5) is from the tangential rear plane (543) to the tangential front plane (544); the bottom surface of the second blade (55) is horizontally arranged.

3. The submersible aeration device according to claim 2, characterized in that: The bottom surface of the first blade (54) is provided with a plurality of cutting grooves, which are arranged at intervals along the width direction of the first blade (54).

4. The submersible aeration device according to claim 3, characterized in that: The height h1 of the first blade (54) is greater than the height h2 of the second blade (55), and h1-h2=5~15mm; the lower end face of the aerator (6) is located below the inclined bottom face (542) of the first blade (54); the radial outer end of the first blade (54) is flush with the side of the wheel (53), and the radial outer end of the second blade (55) is located inside the side of the wheel (53) and the distance between it and the side of the wheel (53) is 5~25mm.

5. The submersible aeration device according to claim 4, characterized in that: Also includes: An aeration pipe (57) is provided between adjacent first blades (54) and second blades (55). The two ends of the aeration pipe (57) are connected to the first flow channel (541) and the second flow channel (551) respectively. The aeration pipe (57) is an arc-shaped pipe and its arc center is coaxial with the axis of the wheel (53). The upper part of the aeration pipe (57) is clearance-fitted with the wheel (53). A number of third aeration holes are densely distributed on the circumferential sidewall of the aeration pipe (57). The diameter of the third aeration holes is 0.1~0.2mm.

6. An aeration method, using the submersible aeration equipment as described in claim 5, characterized in that, Includes the following steps:

1. When the composite impeller (5) rotates at high speed, the air above the water surface enters the mixing chamber (4) through the air inlet pipe (1) and the air inlet chamber (3), and then enters the first flow channel (541) and the second flow channel (551). Due to the negative pressure formed in the mixing chamber (4), the air in the first flow channel (541) and the second flow channel (551) is divided into three parts. Most of the air moves outward in the first flow channel (541) and the second flow channel (551), a part of the air enters the aerator (6) through the diversion hole (56), and another part of the air enters the aeration pipe (57).

2. Air with a certain speed is sprayed outward and downward from the first aeration hole (621) of the high-speed rotating aerator (6) at an angle, and rotates under the action of centrifugal force, and mixes with the water in the outer ring of the aerator (6) to form a first air-water mixture in an inclined state. The second aeration hole (631) is sprayed outward and rotates under the action of centrifugal force, and forms a second air-water mixture sprayed horizontally with the water in the outer ring of the aerator (6). Third, since the flow directions of the first and second soda-water mixtures are not parallel and thus intersect, the two soda-water mixtures cut and mix with each other in the circumferential direction of the outer ring of the aerator (6), making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, forming the third soda-water mixture. During the outward flow between the first blade (54) and the second blade (55), it continuously mixes, collides and cuts with the air sprayed in the circumferential direction by the aeration pipe (57) in a three-dimensional manner, further making the water droplets and bubbles smaller and denser, transferring more oxygen to the water, forming the fourth soda-water mixture. Fourth, the first blade (54) of high-speed rotation cuts the fourth soda-water mixture again, making the water droplets and bubbles smaller and denser, so as to improve the oxygen dissolution efficiency; the cut part of the soda-water mixture moves upward at an angle and collides and mixes with the outward moving soda-water mixture again to form a three-dimensional mixture, transferring more oxygen to the water. Fifth, since the height of the first blade (54) is greater than the height of the second blade (55), a portion of the fourth steam-water mixture in front of the first blade (54) is cut by the cutting groove under the action of the first blade (54) and passes over the second blade (55) to enter between the second blade (55) and the first blade (54) in front of the first blade (54), so that the two streams of steam-water mixture after being cut by themselves mix and collide with each other, so that more oxygen dissolves in the water; VI. The high-speed rotating first blade (54) drives the steam-water mixture in front of it to rotate. Since the radial outer end of the first blade (54) is flush with the side of the wheel (53) and the radial outer end of the second blade (55) is located inside the side of the wheel (53), when the steam-water mixture moves in the direction of rotation, it is approximately perpendicular to the direction of air movement flowing out from the second flow channel (551) of the second blade (55). This causes the two fluids to cut and mix intensely with each other, making the water droplets and bubbles smaller and finer, and allowing more oxygen to dissolve in the water. Most of the steam-water mixture flows out from the flow channel of the mixing chamber (4), and a small amount of steam-water mixture passes over the front end of the second blade (55) and mixes again with the steam-water mixture in front of the rotating second blade (55), further improving the oxygen transfer efficiency, and then flows out from the next flow channel of the mixing chamber (4).

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