Submersible aerator and aeration method

Abstract

The invention provides a submersible aerator and an aeration method.The submersible aerator comprises an air inlet pipe, an aeration chamber and a submersible electric pump, the aeration chamber comprises a water jacket and an aeration disc, the aeration disc is provided with an aeration cavity with an opening in the upper end and a plurality of flow channels distributed in the circumferential direction of the aeration cavity and communicated with the aeration cavity, and the bottom end of the water jacket is connected with the top end of the aeration disc; an inner cavity of the water jacket is communicated with the aeration cavity; the air inlet pipe is coaxially arranged in the water jacket, and the bottom end of the air inlet pipe is positioned at an opening in the upper end of the aeration cavity; the top end of the air inlet pipe is located above the liquid level, and the top end of the water jacket is 10-50 mm below the liquid level. A first impeller is arranged in the aeration cavity; the first impeller is connected with a submersible electric pump positioned below the aeration disc; according to the submersible aerator and the aeration method provided by the invention, the amount of air entering a water body is effectively increased, and the oxygen dissolving efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a submersible aerator and an aeration method. Background Art

[0002] Submersible centrifugal aerators are widely used in sewage treatment and aeration and oxygenation of water bodies in rivers and lakes. The high-speed rotating impeller forms a negative pressure in the mixing disk, allowing the air on the water surface to enter the mixing disk to form a soda-water mixture, which is ejected from the surrounding flow channel at high speed to oxygenate the water body. However, the existing submersible centrifugal aerators for oxygenation have the following limitations: 1. The amount of air inhaled by the existing submersible centrifugal aerator is limited, which limits the dissolved oxygen efficiency; 2. The movement path of the soda-water mixture ejected by the existing submersible centrifugal aerator is short, which limits the oxygen transfer effect; 3. The water droplets and bubbles produced by the existing submersible centrifugal aerator are large and few, which limits the dissolved oxygen effect. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a submersible aerator and an aeration method to effectively increase the amount of air entering the water body and improve the dissolved oxygen efficiency.

[0004] To solve the above technical problems, in the first aspect, an embodiment of the present invention provides a submersible aerator, comprising an air inlet pipe, an aeration chamber and a submersible electric pump, the aeration chamber comprising a water jacket and an aeration plate, the aeration plate being provided with an aeration chamber with an upper opening and a plurality of flow channels distributed circumferentially along the aeration chamber and connected to the aeration chamber, the bottom end of the water jacket being connected to the top end of the aeration plate, and the inner cavity of the water jacket being connected to the aeration chamber; the air inlet pipe is coaxially arranged in the water jacket, and the bottom end is located at the upper opening of the aeration chamber; the top end of the air inlet pipe is located above the liquid surface, and the top end of the water jacket is located 10-50 mm below the liquid surface; a first impeller is provided in the aeration chamber, and the first impeller is connected to the submersible electric pump located below the aeration plate.

[0005] As a further improvement to the embodiment of the present invention, an air outlet is provided on the pipe wall of the air inlet pipe located in the water jacket.

[0006] As a further improvement of the embodiment of the present invention, the water jacket is in a truncated cone shape, and the diameter of the water jacket gradually decreases from top to bottom.

[0007] As a further improvement of an embodiment of the present invention, the first impeller includes a hub and a plurality of blades, the hub is connected to the rotor shaft of the submersible electric pump through an axial hole; the blades are evenly arranged along the circumference of the hub; the hub is provided with 2N first through holes penetrating its upper and lower ends, and the plurality of first through holes are evenly distributed around the axial hole; a second impeller is also provided in the aeration chamber, the second impeller is located below the first impeller, and the second impeller is connected to the submersible electric pump; the distance between the axes of the two first through holes located on the same diameter of the hub minus the diameter of the bottom end of the first through hole is greater than or equal to the outer diameter of the second impeller; N is an integer greater than or equal to 1.

[0008] As a further improvement to the embodiment of the present invention, the first through hole is in a truncated cone shape, and its diameter gradually increases from top to bottom.

[0009] As a further improvement to the embodiment of the present invention, a plurality of strip-shaped first cutting knives are provided at the top of the hub.

[0010] As a further improvement of the embodiment of the present invention, the first impeller also includes a cover plate, which is arranged outside the hub, and the bottom end of the blade is connected to the top end of the cover plate; a strip-shaped second cutting knife is provided at the bottom end of the cover plate.

[0011] As a further improvement to the embodiment of the present invention, the cover plate is provided with a plurality of second through holes penetrating the upper and lower ends thereof, and the second through holes are located between adjacent blades.

[0012] In a second aspect, an embodiment of the present invention further provides an aeration method, using the submersible aerator provided in the first aspect; the method comprises:

[0013] Step 10, the first impeller rotates in the aeration chamber to eject the fluid in the aeration chamber through the flow channel; a vacuum is formed in the aeration chamber, water enters the water jacket from the top opening of the water jacket, and at the same time drives the air near the liquid surface into the water jacket, and mixes in the water jacket to form a first pre-steam-water mixed liquid;

[0014] Step 20, the air above the liquid surface enters the air inlet pipe from the top opening of the air inlet pipe, a small part of the air in the air inlet pipe enters between the water jacket and the air inlet pipe through the air outlet hole on the wall of the air inlet pipe, and mixes with the first pre-steam-water mixture to form a second pre-steam-water mixture; during the downward flow of the second pre-steam-water mixture, it is continuously cut and merged with the air entering between the water jacket and the air inlet pipe through the air outlet hole, the oxygen content of the second pre-steam-water mixture is continuously increased, and finally enters the aeration chamber; most of the air in the air inlet pipe enters the aeration chamber through the bottom opening of the air inlet pipe;

[0015] Step 30, the pre-steam-water mixture and air entering the aeration chamber are mixed and integrated with each other under the action of the first impeller to form a steam-water mixture which is sprayed into the water body through the flow channel.

[0016] As a further improvement of the embodiment of the present invention, in step 30, the first cutting knife cuts the soda-water mixture above the first impeller, making the water droplets and bubbles smaller and denser, transferring more oxygen into the water to improve the dissolved oxygen efficiency; the second impeller rotates to generate a flowing fluid below the first impeller, and since the diameter of the first through hole gradually increases from top to bottom, the flow rate at the top entrance of the first through hole is greater, generating a greater vacuum, so that more air is sucked into the first through hole along with a portion of the soda-water mixture, and then flows to the bottom of the first impeller, thereby increasing the aeration volume again; at the same time, the air from the first through hole is sucked into the first through hole. The soda-water mixture flowing out of the hole is continuously cut by the second cutting knife and has the effect of increasing dissolved oxygen, and then is ejected outward under the action of the second impeller; most of the soda-water mixture produced by the first impeller flows outward, and a small part of the soda-water mixture flows downward to the bottom of the first impeller through the second through hole; the soda-water mixture thrown out by the second impeller and the soda-water mixture flowing out of the second through hole have flow directions perpendicular to each other, and the two fluids cut and mix with each other, once again making the water droplets and bubbles smaller and denser, constantly changing the movement path of oxygen, and transferring more oxygen to the water; the soda-water mixture is sprayed into the water body through the flow channel.

[0017] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0018] The present invention provides a submersible aerator and an aeration method, wherein water enters the water jacket from the top opening of the water jacket, then continuously flows into the aeration chamber, and then is sprayed into the water at high speed under the action of a first impeller, a negative pressure is generated in the aeration chamber, air is sucked into the aeration chamber and mixed with the fluid to form a steam-water mixture, and then sprayed out at high speed, and a centrifugal aeration process is performed. During the rapid downward flow of the water through the water jacket, air near the liquid surface is sucked into the water jacket and mixed with the water to form a first pre-steam-water mixture; air above the liquid surface enters the air intake pipe from the top opening of the air intake pipe, a small amount of air enters the water jacket from the air outlet of the air intake pipe, and is mixed with the first pre-steam-water mixture to form a second pre-steam-water mixture, and the second pre-steam-water mixture enters the aeration chamber as a power fluid for the first impeller; most of the air directly enters the aeration chamber through the bottom opening of the air intake pipe, and is mixed with the second pre-steam-water mixture in the aeration chamber to form a newer steam-water mixture, which is sprayed into the water under the action of the first impeller. The pathways for inhaling air are increased, thereby effectively increasing the amount of air entering the water body, transferring more oxygen into the water body, and effectively improving the efficiency of dissolved oxygen. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 is a structural schematic diagram of a submersible aerator according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Schematic diagram of the structure of the first impeller.

[0022] The figure includes: air inlet pipe 1, air outlet 11, water jacket 2, first impeller 3, hub 31, shaft hole 32, second cutting knife 33, cover plate 34, blade 35, first cutting knife 36, first through hole 37, second through hole 38, second impeller 4, submersible electric pump 5, base 6, aeration plate 7, height h of the top of the water jacket below the liquid level, water Q1 entering the water jacket, air Q2 entering the water jacket from the liquid surface attachment, air Q3 entering the water jacket through the air outlet, and air Q4 entering the aeration chamber through the bottom of the air inlet pipe. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0024] The embodiment of the present invention provides a submersible aerator, such as Figure 1 As shown, it includes an air inlet pipe 1, an aeration chamber, a submersible electric pump 5 and a base 6. The submersible electric pump 5 is vertically arranged on the base 6, and the aeration chamber is arranged above the submersible electric pump 5. The submersible electric pump 5 and the base 6 can be placed on the bottom of the pool by their own weight, or the submersible electric pump 5 together with the base can be fixed on the concrete structure of the bottom of the pool.

[0025] The aeration chamber includes a water jacket 2 and an aeration plate 7. The aeration plate 7 is provided with an aeration cavity with an upper opening and a plurality of flow channels distributed along the circumference of the aeration cavity and connected to the aeration cavity. The bottom end of the water jacket 2 is connected to the top of the aeration plate, and the inner cavity of the water jacket 2 is connected to the aeration cavity. The air inlet pipe 1 is coaxially arranged in the water jacket 2, and the bottom end is located at the upper opening of the aeration cavity. The top of the air inlet pipe 1 is located above the liquid surface, and the top of the water jacket 2 is located below the liquid surface. A first impeller 3 is provided in the aeration cavity, and the first impeller 3 is connected to a submersible electric pump 5. The first impeller 3 rotates, and the water enters the sandwich cavity between the water jacket and the air inlet pipe through the top opening of the water jacket, and then flows downward into the aeration cavity of the aeration plate. Preferably, the distance between the inner wall of the water jacket 2 and the outer wall of the air inlet pipe is 20-100 mm. The cross-sectional area of ​​the sandwich cavity is small, which can ensure that the fluid in the sandwich cavity maintains a high flow rate, so that a high vacuum degree is formed on the top of the water jacket and in the sandwich cavity, bringing more air into the sandwich cavity, and further increasing the amount of air entering the water body. Preferably, the top of the water jacket 2 is located 10-50mm below the liquid surface. Setting a smaller distance is conducive to the rapid downward flow of water from the top opening of the water jacket, so that more water near the liquid surface in contact with air flows into the sandwich cavity, driving more air Q2 above the liquid surface into the sandwich cavity, forming a first pre-steam-water mixture, and increasing the air content in the first pre-steam-water mixture, thereby increasing the aeration amount.

[0026] Preferably, the water jacket 2 is in a truncated cone shape, and the diameter of the water jacket gradually decreases from top to bottom. That is, the large end of the water jacket is located at the top, and the small end is located at the bottom, and the cross-sectional area of ​​the clamping cavity gradually decreases from top to bottom, so that the flow rate of the steam-water mixture in the clamping cavity gradually increases, the vacuum degree is continuously increased, and more air is brought into the pre-steam-water mixture in the clamping cavity.

[0027] Preferably, an air outlet 11 is provided on the wall of the air inlet pipe 1 located in the water jacket 2. When the first pre-steam-water mixture in the sandwich chamber moves downward rapidly, a local vacuum is formed, so that the air Q3 in the air inlet pipe enters the sandwich chamber through the air outlet 11 to form a second pre-steam-water mixture. As the fluid flows downward, the flow rate in the sandwich chamber is continuously increased, and the vacuum degree is continuously increased as it flows downward, thereby continuously increasing the amount of air entering the sandwich chamber through the air outlet, continuously increasing the air content of the second pre-steam-water mixture, and continuously improving the aeration effect. In the sandwich chamber, during the process of the fluid flowing from top to bottom, the flow rate and speed of the air in the air inlet pipe entering the sandwich chamber are increasing, and the direction in which the air enters the sandwich chamber is perpendicular to the flow direction of the pre-steam-water mixture in the sandwich chamber. The air continuously cuts and merges the pre-steam-water mixture flowing downward, and the force of mutual cutting is greater as it flows downward, making the water droplets and bubbles smaller and denser, continuously increasing the oxygen content of the second pre-steam-water mixture, and continuously improving the oxygen transfer efficiency.

[0028] In the submersible aerator of the above-mentioned embodiment, water enters the water jacket from the top opening of the water jacket 2, then flows continuously into the aeration chamber, and then is sprayed into the water body at high speed under the action of the first impeller. Negative pressure is generated in the aeration chamber, and air is sucked into the aeration chamber and mixed with the fluid to form a steam-water mixture, which is then sprayed out at high speed to perform a centrifugal aeration process. There are two ways for air to enter the aeration chamber. The first way is that during the rapid downward flow of the water body through the water jacket, the air near the liquid surface is sucked into the water jacket and mixed with the water body to form a first pre-steam-water mixture. The second way is that the air above the liquid surface enters the air intake pipe from the top opening of the air intake pipe, and a small amount of air enters the water chamber from the air outlet of the air intake pipe, and mixes with the first pre-steam-water mixture to form a second pre-steam-water mixture. The second pre-steam-water mixture enters the aeration chamber as the power fluid of the first impeller. Most of the air directly enters the aeration chamber through the bottom opening of the air inlet pipe, and is mixed with the second pre-steam-water mixture in the aeration chamber to form a newer steam-water mixture, which is sprayed into the water body under the action of the first impeller. The submersible aerator provided in this embodiment increases the way of inhaling air, thereby effectively increasing the amount of air entering the water body, transferring more oxygen into the water body, and effectively improving the dissolved oxygen efficiency.

[0029] As a preferred example, Figure 2 As shown, the first impeller 3 includes a hub 31 and a plurality of blades 35. An axial hole 32 is provided at the center of the hub, and the hub 31 is connected to the rotor shaft of the submersible electric pump 5 through the axial hole 32. The blades 35 are centrifugal, and 3-5 blades are evenly arranged along the circumference of the hub 31. The hub 31 is provided with 2N first through holes 37 penetrating the upper and lower ends thereof, and the plurality of first through holes 37 are evenly distributed around the axial hole 32. N is an integer greater than or equal to 1, for example, N=1, and 2 first through holes are provided; or N=2, and 4 first through holes are provided; or N=3, and 6 first through holes are provided. As shown in FIG. Figure 1 As shown, a second impeller 4 is also provided in the aeration chamber, and the second impeller 4 is located below the first impeller 3, and the second impeller is connected to the submersible electric pump 5. The first impeller 3 and the second impeller 4 are arranged at intervals, and the diameter and thickness of the second impeller 4 are both smaller than the diameter and thickness of the first impeller 3. The distance between the axes of the two first through holes 37 located on the same diameter of the hub minus the diameter of the bottom end of the first through hole is greater than or equal to the outer diameter of the second impeller, that is, the first through holes 37 are distributed above the outer edge of the second impeller.

[0030] In this embodiment, the first through hole 37 is a through hole, and the high-speed rotating second impeller 4 generates radial fluid and forms a vacuum, so that a part of the new soda-water mixture formed by the air entering from the bottom end of the intake pipe above the first impeller and the second pre-steam-water mixture enters the bottom of the first impeller through the first through hole, and is then thrown out at high speed under the action of the second impeller 4.

[0031] Preferably, a spiral cutting groove is provided in the first through hole 37, and when the soda-water mixture moves downward rapidly, it is continuously cut into smaller and denser parts, thereby further improving the oxygen transfer efficiency.

[0032] Preferably, the first through hole 37 is truncated cone-shaped, and its diameter gradually increases from top to bottom. That is, the small end of the first through hole is located at the top, and the large end is located at the bottom. When the second impeller 4 rotates, a high-speed fluid is generated below the first impeller. Since the diameter of the first through hole gradually increases from top to bottom, the flow velocity at the top entrance of the first through hole is greater, and a greater vacuum is generated, so that more air is sucked into the bottom of the first impeller to increase the aeration amount.

[0033] Preferably, a plurality of first strip-shaped cutting knives 36 are provided at the top of the hub 31. When the first impeller rotates, the first cutting knives 36 cut the soda-water mixture above the first impeller 3, making the water droplets and bubbles smaller and denser, transferring more oxygen into the water to improve the dissolved oxygen efficiency.

[0034] Preferably, the first impeller 2 further includes a cover plate 34, which is arranged outside the hub 31, and the bottom end of the blade is connected to the top end of the cover plate. A strip-shaped second cutting knife 33 is provided at the bottom end of the cover plate. The second cutting knife 33 cuts the soda-water mixture below the first impeller 3, making the water droplets and bubbles smaller and denser, and transferring more oxygen to the water to improve the dissolved oxygen efficiency.

[0035] Preferably, the cover plate is provided with a plurality of second through holes 38 penetrating the upper and lower ends thereof, and the second through holes 38 are located between adjacent blades. Most of the soda-water mixture generated by the rotation of the first impeller 3 flows outward at high speed, and a small portion of the soda-water mixture flows from top to bottom through the second through holes 38, which is perpendicular to the flow direction of the radial fluid generated by the second impeller 4. The two fluids cut and mix with each other, once again making the water droplets and bubbles smaller and denser, and transferring more oxygen into the water.

[0036] In the submersible aerator of the above embodiment, the aeration process of the first impeller serves as the main aeration of the aerator, and the aeration of the second impeller serves as the auxiliary aeration of the aerator. The two impellers of different diameters produce radial fluids of different speeds, so that the two streams of the soda-water mixture are cut and merged with each other. On the one hand, the water droplets and bubbles are continuously cut into smaller and denser ones; on the other hand, the position of the air in the new soda-water mixture is continuously changed, and the movement path of the soda-water mixture is increased to continuously improve the dissolved oxygen efficiency. The new soda-water mixture above the first impeller flows into the lower part through the first through hole as part of the power fluid of the second impeller, and at the same time, more air is sucked into the lower part of the first impeller to increase the aeration amount. The soda-water mixture produced by the second impeller is cut by the second cutting knife 33 of the first impeller, cutting the water droplets and bubbles into smaller and denser ones, and at the same time increasing the movement path of the soda-water mixture to increase the dissolved oxygen efficiency. A small portion of the soda-water mixture produced by the first impeller flows into the lower part of the first impeller through the second through hole, and is perpendicular to the flow direction of the soda-water mixture produced by the second impeller 4. The two fluids cut and mix with each other, once again making the water droplets and bubbles smaller and denser, transferring more oxygen into the water.

[0037] The working process of the submersible aerator of the above preferred embodiment is as follows:

[0038] When the first impeller 3 and the second impeller 4 rotate at high speed in the aeration disk 7 and eject the fluid from the flow channel, a certain vacuum is formed in the aeration chamber, and the water body Q1 quickly enters the clamping chamber from the top opening of the water jacket and then enters the aeration chamber, and the air above the liquid surface enters the aeration chamber through the air inlet pipe 1.

[0039] When the water flows rapidly downward from the top opening of the water jacket, the air Q2 near the liquid surface is driven into the sandwich cavity, and the first pre-steam-water mixture is formed with the water. When the first pre-steam-water mixture in the sandwich cavity moves rapidly downward, a local vacuum is formed, so that the air Q3 in the air inlet pipe enters the sandwich cavity through the air outlet 11, dissolves in the first pre-steam-water mixture, and forms a second pre-steam-water mixture. As the fluid flows from top to bottom in the sandwich cavity, the flow rate continues to increase, the vacuum degree continues to increase, and the air flow rate and speed entering the sandwich cavity through the air outlet 11 are increasing. The direction in which the air enters the sandwich cavity is perpendicular to the flow direction of the pre-steam-water mixture in the sandwich cavity. The air continuously cuts and merges the pre-steam-water mixture flowing downward. The further it goes down to the bottom of the air inlet pipe, the greater the force of mutual cutting, making the water droplets and bubbles smaller and denser, continuously improving the oxygen content of the second pre-steam-water mixture, and continuously improving the oxygen transfer efficiency.

[0040] The second pre-steam-water mixture enters the aeration chamber and serves as the power fluid of the aerator, thereby increasing the aeration volume. The second pre-steam-water mixture and the air Q4 entering the aeration chamber through the bottom end of the air inlet pipe 1 are mixed and integrated with each other in the aeration chamber, thereby further improving the oxygen transfer effect.

[0041] The first cutting blade cuts the soda-water mixture above the first impeller 3, making the water droplets and bubbles smaller and denser, transferring more oxygen to the water to improve the dissolved oxygen efficiency. When the second impeller 4 rotates, a high-speed fluid is generated below the first impeller 3. Since the diameter of the first through hole 37 gradually increases from top to bottom, the flow rate at the top entrance of the first through hole is greater, generating a greater vacuum, so that more air is sucked into the bottom of the first impeller 3 along with a part of the soda-water mixture, and the aeration volume is increased again. At the same time, in the first through hole 37, the soda-water mixture is continuously cut by the spiral cutting groove and the dissolved oxygen effect is increased, and then it is thrown out at high speed by the second impeller 4. Cut by the second cutting blade 33, the water droplets and bubbles are cut into smaller and denser, and the moving path of the soda-water mixture is increased to increase the dissolved oxygen efficiency. Most of the soda-water mixture generated by the rotation of the first impeller 3 flows outward at high speed, and a smaller part flows from top to bottom through the second through hole 38. The soda-water mixture flowing out of the second through hole 38 moves from top to bottom, and is perpendicular to the flow direction of the soda-water mixture flowing out of the first through hole 37 formed after being thrown out at high speed by the second impeller 4 and cut by the second cutting knife. The two fluids cut and mix with each other, once again making the water droplets and bubbles smaller and denser, constantly changing the movement path of oxygen, and transferring more oxygen into the water.

[0042] The aeration process of the first impeller 3 serves as the main aeration of the aerator, and the aeration of the second impeller 4 serves as the auxiliary aeration of the aerator. The two impellers with different diameters produce radial fluids with different speeds, so that the two streams of soda-water mixtures with different oxygen contents are further cut and integrated with each other. On the one hand, the water droplets and bubbles are continuously cut into smaller and denser ones; on the other hand, the position of the air in the new soda-water mixture is continuously changed, and the movement path of the soda-water mixture is increased to continuously improve the dissolved oxygen efficiency.

[0043] The embodiment of the present invention further provides an aeration method, using the submersible aerator provided in the above embodiment. The aeration method includes:

[0044] In step 10, the first impeller 3 rotates in the aeration chamber to eject the fluid in the aeration chamber through the flow channel; a vacuum is formed in the aeration chamber, and water enters the water jacket 2 from the top opening of the water jacket 2, while driving the air near the liquid surface into the water jacket, and mixing in the water jacket to form a first pre-steam-water mixed liquid.

[0045] Step 20, the air above the liquid surface enters the air inlet pipe 1 from the top opening of the air inlet pipe 1, a small part of the air in the air inlet pipe enters between the water jacket and the air inlet pipe through the air outlet holes on the wall of the air inlet pipe, and mixes with the first pre-steam-water mixture to form a second pre-steam-water mixture; during the downward flow of the second pre-steam-water mixture, it is continuously cut and merged with the air entering between the water jacket and the air inlet pipe through the air outlet holes, and the oxygen content of the second pre-steam-water mixture increases continuously from top to bottom, and finally enters the aeration chamber; most of the air in the air inlet pipe enters the aeration chamber through the bottom opening of the air inlet pipe.

[0046] Step 30, the pre-steam-water mixture and air entering the aeration chamber are mixed and integrated with each other under the action of the first impeller to form a steam-water mixture which is sprayed into the water body through the flow channel.

[0047] Preferably, in step 30, the first cutting knife cuts the soda-water mixture above the first impeller 3, so that the water droplets and bubbles become smaller and denser, and more oxygen is transferred to the water to improve the dissolved oxygen efficiency. The second impeller 4 rotates, and a flowing fluid is generated below the first impeller 3. Since the diameter of the first through hole 37 gradually decreases from bottom to top, the flow rate at the top entrance of the first through hole is larger, and a larger vacuum is generated, so that more air is sucked into the first through hole 37 along with a part of the soda-water mixture, and flows to the bottom of the first impeller 3, thereby increasing the aeration volume again. At the same time, the soda-water mixture flowing out of the first through hole 37 is continuously cut by the second cutting knife under the action of the second impeller and the dissolved oxygen effect is increased before being ejected outward. Among the soda-water mixture generated by the first impeller 3, most of the soda-water mixture flows outward, and a small part of the soda-water mixture flows downward through the second through hole 38 to the bottom of the first impeller 3. The flow directions of the soda-water mixture thrown out by the second impeller 4 and the soda-water mixture flowing out of the second through hole 38 are perpendicular to each other, and the two fluids cut and mix with each other, once again making the water droplets and bubbles smaller and denser, constantly changing the movement path of oxygen, and transferring more oxygen to the water. Finally, the soda-water mixture in the aeration chamber is sprayed into the water body through the flow channel.

[0048] In the aeration method of the above embodiment, water enters the water jacket from the top opening of the water jacket, and then flows into the aeration chamber continuously, and then is sprayed into the water at a high speed under the action of the first impeller, and negative pressure is generated in the aeration chamber, and air is sucked into the aeration chamber and mixed with the fluid to form a steam-water mixture, and then sprayed out at a high speed, and a centrifugal aeration process is performed. During the rapid downward flow of the water through the water jacket, the air near the liquid surface is sucked into the water jacket and mixed with the water to form a first pre-steam-water mixture; the air above the liquid surface enters the air intake pipe from the top opening of the air intake pipe, and a small amount of air enters the water jacket from the air outlet of the air intake pipe, and is mixed with the first pre-steam-water mixture to form a second pre-steam-water mixture, and the second pre-steam-water mixture enters the aeration chamber as the power fluid of the first impeller; most of the air directly enters the aeration chamber through the bottom opening of the air intake pipe, and is mixed with the second pre-steam-water mixture in the aeration chamber to form a newer steam-water mixture, which is sprayed into the water under the action of the first impeller. The pathways for inhaling air are increased, thereby effectively increasing the amount of air entering the water body, transferring more oxygen into the water body, and effectively improving the efficiency of dissolved oxygen.

[0049] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A submersible aerator, characterized in that: The invention comprises an air inlet pipe (1), an aeration chamber and a submersible electric pump (5); the aeration chamber comprises a water jacket (2) and an aeration plate (7); the aeration plate (7) is provided with an aeration chamber with an upper opening and a plurality of flow channels distributed along the circumference of the aeration chamber and connected to the aeration chamber; the bottom end of the water jacket (2) is connected to the top end of the aeration plate, and the inner cavity of the water jacket (2) is connected to the aeration chamber; the air inlet pipe (1) is coaxially arranged in the water jacket (2), and the bottom end is located at the upper opening of the aeration chamber; the top end of the air inlet pipe (1) is located above the liquid surface, and the top end of the water jacket (2) is located 10-50 mm below the liquid surface; a first impeller (3) is provided in the aeration chamber, and the first impeller (3) is connected to the submersible electric pump (5) located below the aeration plate.

2. The submersible aerator according to claim 1, characterized in that: An air outlet hole is provided on the pipe wall of the air inlet pipe located inside the water jacket (2).

3. The submersible aerator according to claim 1, characterized in that: The water jacket (2) is in the shape of a truncated cone, and the diameter of the water jacket gradually decreases from top to bottom.

4. The submersible aerator according to claim 1, characterized in that: The first impeller (3) comprises a hub (31) and a plurality of blades (35), wherein the hub (31) is connected to the rotor shaft of the submersible electric pump via an axial hole (32); the blades are evenly arranged along the circumference of the hub (31); the hub (31) is provided with 2N first through holes (37) penetrating the upper and lower ends thereof, and the plurality of first through holes (37) are evenly distributed around the axial hole (32); a second impeller (4) is also arranged in the aeration chamber, the second impeller (4) is located below the first impeller (3), and the second impeller is connected to the submersible electric pump (5); the distance between the axes of the two first through holes (37) located on the same diameter of the hub minus the diameter of the bottom end of the first through hole is greater than or equal to the outer diameter of the second impeller; and N is an integer greater than or equal to 1.

5. The submersible aerator according to claim 4, characterized in that: The first through hole (37) is in the shape of a truncated cone, and its diameter gradually increases from top to bottom.

6. The submersible aerator according to claim 4, characterized in that: A plurality of strip-shaped first cutting knives (36) are provided at the top end of the wheel hub (31).

7. The submersible aerator according to claim 4, characterized in that: The first impeller (2) further comprises a cover plate (34), which is arranged outside the hub (31), and the bottom end of the blade is connected to the top end of the cover plate; a strip-shaped second cutting knife (33) is provided at the bottom end of the cover plate.

8. The submersible aerator according to claim 7, characterized in that: The cover plate is provided with a plurality of second through holes (38) penetrating the upper and lower ends thereof, and the second through holes (38) are located between adjacent blades.

9. An aeration method, characterized in that: Using the submersible aerator according to any one of claims 1 to 8; the method comprises: Step 10, the first impeller (3) rotates in the aeration chamber to eject the fluid in the aeration chamber through the flow channel; a vacuum is formed in the aeration chamber, water enters the water jacket (2) from the top opening of the water jacket (2), and at the same time drives air near the liquid surface into the water jacket, and is mixed in the water jacket to form a first pre-steam-water mixed liquid; Step 20, the air above the liquid surface enters the air inlet pipe (1) from the top opening of the air inlet pipe (1), a small part of the air in the air inlet pipe enters between the water jacket and the air inlet pipe through the air outlet hole on the wall of the air inlet pipe, and mixes with the first pre-steam-water mixed liquid to form a second pre-steam-water mixed liquid; during the downward flow of the second pre-steam-water mixed liquid, it is continuously cut and merged with the air entering between the water jacket and the air inlet pipe through the air outlet hole, and the oxygen content of the second pre-steam-water mixed liquid is continuously increased, and finally enters the aeration chamber; most of the air in the air inlet pipe enters the aeration chamber through the bottom opening of the air inlet pipe; Step 30, the pre-steam-water mixture and air entering the aeration chamber are mixed and integrated with each other under the action of the first impeller to form a steam-water mixture which is sprayed into the water body through the flow channel.

10. The aeration method according to claim 9, characterized in that: In step 30, the first cutting blade cuts the soda-water mixture above the first impeller (3), making the water droplets and bubbles smaller and denser, transferring more oxygen into the water to improve the oxygen dissolving efficiency; The second impeller (4) rotates, generating a flowing fluid below the first impeller (3). Since the diameter of the first through hole (37) gradually increases from top to bottom, the flow velocity at the top entrance of the first through hole is greater, generating a greater vacuum, so that more air is sucked into the first through hole (37) along with a portion of the soda-water mixture, and then flows to the bottom of the first impeller (3), thereby increasing the aeration volume again. At the same time, the soda-water mixture flowing out of the first through hole (37) is continuously cut by the second cutting knife to increase the dissolved oxygen effect, and then is immediately discharged by the second impeller (4). The steam-water mixture (34) is ejected outward under the action of the first impeller (3); most of the steam-water mixture (34) flows outward, and a small part of the steam-water mixture (34) flows downward through the second through hole (38) to the bottom of the first impeller (3); the flow directions of the steam-water mixture ejected by the second impeller (4) and the steam-water mixture flowing out of the second through hole (38) are perpendicular to each other, and the two streams of fluid cut and mix with each other, once again making the water droplets and bubbles smaller and denser, constantly changing the movement path of oxygen, and transferring more oxygen to the water; the steam-water mixture is ejected into the water body through the flow channel.

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