An efficient submersible aeration method

Abstract

The present invention provides an efficient submersible aeration method, which includes the following steps: Step 10) Install the submersible aerator into the water body; Step 20) Start the submersible aerator, and the first impeller forms a negative pressure in the mixing chamber of the mixing disk, so that the air on the water surface enters the mixing chamber and mixes with the water to form the first-generation steam-water mixture, realizing the first aeration; Step 30) The steam-water mixture is tangentially ejected from each flow channel of the mixing disk around the axis of the submersible motor pump, and is circumferentially injected into the water body on the vertical plane perpendicular to the axis of the submersible motor pump, continuously mixes with the water body, and integrates the air in the steam-water mixture into the surrounding water body to realize oxygen transfer; The steam-water mixture ejected from each flow channel oxygenates the water body in the depth direction; The flow fields generated after the steam-water mixtures ejected from different flow channels enter the water body interact with each other and integrate. The present invention provides an efficient submersible aeration method, which enables the dissolved oxygen effects at the bottom, middle and upper parts of the water body to be evenly distributed and increases the dissolved oxygen efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of environmental protection, and particularly relates to an efficient submersible aeration method. Background Art

[0002] Submersible aerators are applied to sewage treatment and water body aeration and oxygenation of rivers and lakes to improve the water environment. However, there are the following limitations in using existing submersible aerators for oxygenation:

[0003] 1. The fluidity of the water body in the depth direction is poor, and the oxygenation effect is uneven, which restricts the dissolved oxygen effect of the water body.

[0004] 2. If a submersible aerator is used, the dissolved oxygen effect on the water surface is poor; if a surface aerator is used, the dissolved oxygen effect in the lower part of the water body is poor.

[0005] 3. When the width of a pool or a river is narrow, when using a submersible aerator for aeration, it cannot simultaneously meet the balanced oxygenation in the three-dimensional directions of length, width, and depth. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: to provide an efficient submersible aeration method to evenly distribute the dissolved oxygen effects at the bottom, middle, and upper parts of the water body and increase the dissolved oxygen efficiency.

[0007] To solve the above technical problem, an embodiment of the present invention provides an efficient submersible aeration method, including the following steps:

[0008] Step 10) Install the submersible aerator into the water body. The submersible electric pump, air intake disc, and mixing disc of the submersible aerator are arranged in sequence horizontally, and the center lines of the water outlets of all flow channels of the mixing disc are located on the same vertical plane perpendicular to the axis of the submersible electric pump;

[0009] Step 20) Start the submersible aerator. The rotating first impeller forms a negative pressure in the mixing chamber of the mixing disc. The air on the water surface sequentially enters the mixing chamber of the mixing disc through the air inlet pipe and the air intake disc. The air and water are mixed in the mixing chamber to form a first-generation steam-water mixture, realizing the first aeration;

[0010] Step 30) The steam-water mixture is tangentially ejected from each flow channel of the mixing disc around the axis of the submersible pump, and is circumferentially injected into the water body on the vertical plane perpendicular to the axis of the submersible pump. It continuously mixes with the water body, and the air in the steam-water mixture is continuously incorporated into the surrounding water body to achieve oxygen transfer. The steam-water mixture ejected from each flow channel enters the water body at different depths, thereby oxygenating the water body in the depth direction, improving the balance of dissolved oxygen at the bottom, middle and top of the water body, and at the same time improving the dissolved oxygen effect in the width direction of the water body. The flow fields generated by the steam-water mixture ejected from different flow channels interact and merge with each other, enabling more oxygen to dissolve in the water and improving the oxygen transfer efficiency on the vertical plane perpendicular to the axis of the submersible pump.

[0011] As a further improvement of the embodiment of the present invention, an air diffuser pipe is provided at the water outlet of the flow channel at the topmost end of the mixing disc.

[0012] The method further includes:

[0013] Step 40) The steam-water mixture in the flow channel provided with the air diffuser pipe enters the air diffuser pipe from the flow channel and is continuously mixed evenly in the air diffuser pipe. When the steam-water mixture is ejected from the air diffuser pipe, it moves upward, and during the upward movement, the steam-water mixture continuously mixes with the surrounding water body, and the oxygen in the steam-water mixture is continuously incorporated into the surrounding water body to achieve the first oxygen transfer. When the steam-water mixture surges upward from the liquid surface with part of the water body, a second-generation steam-water mixture is formed. The second-generation steam-water mixture forms a fountain of fine water droplets above the liquid surface. The fountain contacts the surrounding air, and the air is continuously incorporated into the steam-water mixture to achieve the second aeration. The oxygen content in the second-generation steam-water mixture continuously increases, and a third-generation steam-water mixture containing more oxygen falls onto the water surface. After the third-generation steam-water mixture falls onto the water surface, it mixes with the surface water body to perform the second oxygen transfer. While the steam-water mixture continues to move downward and continuously mixes with the water body for the second oxygen transfer, it also interacts and merges with the steam-water mixture just ejected from the air diffuser pipe and the steam-water mixture ejected underwater from adjacent flow channels.

[0014] As a further improvement of the embodiment of the present invention, a partition plate is provided in the air diffuser pipe, and the partition plate is in the same plane as the center line of the air diffuser pipe.

[0015] In the said step 40), the steam-water mixture in the flow channel provided with the air diffuser pipe enters the air diffuser pipe from the flow channel, is continuously mixed evenly in the air diffuser pipe, and forms two streams of steam-water mixture under the action of the partition plate, which are respectively ejected rapidly in all directions from the outlets of the two channels, increasing the spraying range in the width direction. When the steam-water mixture in the air diffuser pipe is ejected upward, the adjacent parts of the two streams of steam-water mixture cut and collide with each other, making the water droplets and bubbles finer, and then mixing with the surrounding water body. At the same time, the remaining parts of the two streams of steam-water mixture directly mix with the surrounding water body to perform the first oxygen transfer, enabling more oxygen to be incorporated into the water body.

[0016] As a further improvement of the embodiment of the present invention, the water outlet of the mixing disk is provided with aeration pipes at the water outlets of the adjacent two channels of the uppermost channel.

[0017] In step 40), when the three steam-water mixed liquids are ejected from the aeration pipes at high speed, the steam-water mixed liquids are continuously mixed with the surrounding water bodies for the first oxygen transfer; at the same time, the edges of the adjacent steam-water mixed liquids collide, making the water droplets and air finer, and the oxygen in the mixed liquid continuously dissolves into the water body for the first oxygen transfer, thereby improving the oxygen transfer rate.

[0018] As a further improvement of the embodiment of the present invention, a second impeller is further installed at the end of the rotor shaft of the submersible pump, and the second impeller is located outside the mixing disk.

[0019] The method further includes:

[0020] Step 50) The rotating second impeller continuously pushes the steam-water mixed liquid forward, increasing the moving path of the steam-water mixed liquid and further improving the oxygen transfer efficiency; the second impeller continuously pushes the oxygen-dissolved water body forward, while making the water body with less oxygen at the rear end fill in, so that the oxygen in the steam-water mixed liquid continuously dissolves into the new water body; the second impeller mixes the fluid with a higher oxygen content and the fluid with a lower oxygen content at the front end, making these fluids fully mixed and uniform, so that the oxygen content distribution is uniform, meeting the absorption effect of aerobic bacteria to continuously improve the water quality; the rotating second impeller cuts the steam-water mixed liquid to form finer water droplets and bubbles to improve the oxygen transfer rate; the rotation of the second impeller prevents the precipitation of activated sludge, making more oxygen dissolve in the activated sludge to improve the oxygen dissolution efficiency.

[0021] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0022] (1) By installing the submersible pump, the air inlet disk and the mixing disk horizontally in sequence, the center lines of the water outlets of all channels of the mixing disk are located on the same vertical plane, so that the steam-water mixed liquid is ejected in different directions around the center of the submersible pump axis on the same vertical plane perpendicular to the axis of the submersible pump. The steam-water mixed liquid ejected from the water outlet at the upper part of the mixing disk oxygenates the top of the water body, the steam-water mixed liquid ejected from the water outlet in the middle of the mixing disk oxygenates the middle of the water body, and the steam-water mixed liquid ejected from the water outlet at the lower part of the mixing disk oxygenates the bottom of the water body, making the oxygen dissolution effects at the bottom, middle and top of the water body evenly distributed; at the same time, the water outlet in the middle of the mixing disk ejects the steam-water mixed liquid radially to both sides of the mixing disk, thereby improving the oxygen dissolution effect in the width direction of the water body.

[0023] (2) By arranging an aeration pipe at the water outlet of the flow channel with an upward water outlet direction, and the water outlet of the aeration pipe being lower than the water surface, such that after the steam-water mixture is ejected from the aeration pipe, part of the oxygen is first transferred to the water body, and then it rushes out of the liquid surface with part of the water body, mixes with the air and then falls back into the water body, increasing the aeration times and improving the dissolved oxygen content in the water body.

[0024] (3) By arranging a partition plate in the diffuser pipe section of the aeration pipe, and the partition plate being parallel to the axis of the submersible pump, the diffuser pipe section is divided into two channels in the water body width direction, increasing the spraying range of the steam-water mixture in the width direction, thereby improving the dissolved oxygen range and the dissolved oxygen effect in the water body width direction.

[0025] (4) By arranging a second impeller outside the mixing disc, the steam-water mixture circumferentially around the mixing disc can be mixed with the water body at the front end, making the oxygen content distribution uniform; at the same time, the mixed fluid is promptly pushed forward to the front end, improving the movement path of the steam-water mixture and enhancing the oxygen transfer efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly introduced below. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 is a schematic structural diagram of a high-efficiency submersible aerator in the method of the embodiment of the present invention;

[0028] Figure 2 is Figure 1 a schematic structural diagram of the aeration pipe in

[0029] In the figure: submersible pump 1, air inlet disc 2, air inlet pipe 3, aeration pipe 4, partition plate 41, diffuser pipe 42, constant speed pipe 43, mixing disc 5, flow channel 51, shunt plate 6, second impeller 7, first impeller 8, base 9. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The technical solutions of the present invention will be described in detail below with reference to the drawings.

[0031] It should be noted that for convenience of description, the following term "front end" is Figure 1 the left end in Figure 1 indicating the installation orientation of the first impeller relative to the submersible pump; "rear end" is the right end, indicating the installation orientation of the submersible pump relative to the first impeller; "length" indicates the axis direction of the submersible pump; "width" indicates the direction perpendicular to the axis of the submersible pump on the horizontal plane.

[0032] An efficient submersible aeration method provided by an embodiment of the present invention is based on a submersible aerator. As Figure 1 shown, the submersible aerator includes a base 9, a submersible motor pump 1, an air inlet disc 2, a mixing disc 5 and a first impeller 8. The submersible motor pump 1 is horizontally arranged on the base, the air inlet disc 2 is arranged at the end of the submersible motor pump 1, the mixing disc 5 is arranged at the end of the air inlet disc 2, and the rotor shaft of the submersible motor pump passes through the air inlet disc 2. The first impeller 8 is installed on the rotor shaft of the submersible motor pump 1 and is located in the cavity of the mixing disc 5. The air inlet disc 2 is provided with a cavity, and an air inlet pipe 3 communicating with the cavity is arranged on the air inlet disc 2, and the inlet of the air inlet pipe 3 extends out of the water surface. The entire aerator can be placed at the bottom of the pool (river bottom) by relying on its own weight, or the submersible motor pump together with the base can be fixed on the concrete foundation at the bottom of the pool (river bottom).

[0033] Among them, the mixing disc 5 is provided with a mixing cavity with a circular cross-section, and a plurality of flow channels 51 communicating with the mixing cavity are tangentially arranged along the periphery of the mixing cavity. The number of the flow channels 51 is 6 to 12. The mixing cavity communicates with the cavity of the air inlet disc. The submersible motor pump 1, the air inlet disc 2 and the mixing disc 5 are arranged in sequence horizontally, the air inlet disc and the mixing disc are both vertically arranged, and the center lines of the water outlets of all the flow channels of the mixing disc 5 are located on the same vertical plane perpendicular to the axis of the submersible motor pump 1.

[0034] The embodiment of the present invention provides an efficient submersible aeration method, including the following steps:

[0035] Step 10): Install the submersible aerator into the water body. The submersible motor pump 1, the air inlet disc 2 and the mixing disc 5 of the submersible aerator are arranged in sequence horizontally, and the center lines of the water outlets of all the flow channels of the mixing disc 5 are located on the same vertical plane perpendicular to the axis of the submersible motor pump 1.

[0036] Step 20): Start the submersible aerator. The submersible motor pump 1 drives the first impeller 8 to rotate at a high speed, generating a high-speed water flow. The high-speed water flow forms a negative pressure in the mixing cavity of the mixing disc 5. The air on the water surface enters the mixing cavity of the mixing disc 5 through the air inlet pipe 3 and the air inlet disc 2 in sequence. The air and water are mixed in the mixing cavity to form a first-generation steam-water mixture, realizing the first aeration.

[0037] Step 30): The steam-water mixture is tangentially ejected from each flow channel of the mixing disc 5 around the axis of the submersible motor pump and is circumferentially injected into the water body on the vertical plane perpendicular to the axis of the submersible motor pump, and is continuously mixed with the water body, and the air in the steam-water mixture is continuously dissolved into the surrounding water body, realizing oxygen transfer. The steam-water mixture ejected from each flow channel enters the water body at different depths, thereby oxygenating the water body in the depth direction, improving the balance of dissolved oxygen at the bottom, middle and top of the water body, and at the same time improving the dissolved oxygen effect in the width direction of the water body. The flow fields generated by the steam-water mixture ejected from different flow channels interact with each other and merge with each other, so that more oxygen is dissolved in the water, and the oxygen transfer efficiency on the vertical plane perpendicular to the axis of the submersible motor pump is improved.

[0038] The aeration method of the above embodiment installs the submersible electric pump 1, the air intake disc 2, and the mixing disc 5 horizontally in sequence. The centerlines of the water outlets of all the flow channels of the mixing disc 5 are located on the same vertical plane, so as to spray the steam-water mixture in different directions around the center of the axis of the submersible electric pump on the same vertical plane perpendicular to the axis of the submersible electric pump. The water outlets located in the upper part of the mixing disc spray the steam-water mixture, so that the top of the water body is oxygenated. The water outlets located in the middle part of the mixing disc spray the steam-water mixture, so that the middle part of the water body is oxygenated. The water outlets located in the lower part of the mixing disc spray the steam-water mixture, so that the bottom of the water body is oxygenated, thereby making the dissolved oxygen effects at the bottom, middle, and top of the water body evenly distributed. At the same time, the water outlets located in the middle part of the mixing disc spray the steam-water mixture radially to both sides of the mixing disc, thereby improving the dissolved oxygen effect in the width direction of the water body.

[0039] As a preferred example, the aerator of this embodiment further includes an aeration pipe 4. The aeration pipe 4 is arranged at the water outlet of the flow channel whose water outlet is located at the topmost of the mixing disc, and the outlet end of the aeration pipe 4 is located below the liquid level. The axis of the aeration pipe 4 and the axis of the flow channel communicated with it are on the same straight line. The aeration pipe 4 is equivalent to the extension of the flow channel with the upward water outlet direction, and is used to tangentially inject the first-generation steam-water mixture ejected at high speed from the flow channel 51 upward into the surrounding water body to oxygenate the water body. Preferably, the outlet end of the aeration pipe 4 is 50-400 mm below the liquid level. The specific distance is comprehensively considered according to the power of the submersible electric pump, the cross-sectional size of the mixing disc flow channel, the spraying speed, etc. If the flow velocity at the flow channel outlet is very high, a larger distance can be selected.

[0040] The process of the steam-water mixture spraying out from the flow channel provided with the aeration pipe is different from that of the flow channels not provided with the aeration pipe. The method of the embodiment of the present invention further includes:

[0041] Step 40) The steam-water mixture in the flow channel provided with the aeration pipe enters the aeration pipe from the flow channel and is continuously mixed evenly in the aeration pipe. When the steam-water mixture is ejected from the aeration pipe 4, it moves upward, and during the upward movement, the steam-water mixture is continuously mixed with the surrounding water body, and the oxygen in the steam-water mixture continuously dissolves into the surrounding water body to achieve the first oxygen transfer. When the steam-water mixture gushes upward from the liquid level with part of the water body, a second-generation steam-water mixture is formed. The second-generation steam-water mixture forms a fountain of fine water droplets above the liquid level. The fountain contacts the surrounding air, and the air continuously dissolves into the steam-water mixture to achieve the second aeration. The oxygen content in the second-generation steam-water mixture continuously increases, and a third-generation steam-water mixture containing more oxygen falls onto the water surface. After the third-generation steam-water mixture falls onto the water surface, it is mixed with the surface water body to perform the second oxygen transfer. The steam-water mixture continues to move downward and continuously performs the second oxygen transfer.

[0042] In the method of this embodiment, the fine steam-water mixture ejected from the outlet end of the aeration pipe 4 flows upward. During the flowing process, it continuously collides with and mixes with the surrounding water body, making the water droplets and bubbles smaller. The oxygen in the steam-water mixture continuously undergoes oxygen transfer with the water body in the pool. The longer the moving path, the finer the water droplets and bubbles, and more oxygen in the steam-water mixture will dissolve in the water. Secondly, the steam-water mixture drives part of the water body to rush out of the liquid surface at a high speed, forming a new second-generation steam-water mixture, which becomes finer water droplets. These fine water droplets continuously mix with the air, enabling more air to mix with the second-generation steam-water mixture again, undergoing a second surface aeration process, and finally falling into the water body. Due to the fine water droplets, more air is incorporated into the water. The mixed liquid moves in two different directions, upward and downward, thus increasing the moving path, extending the contact time between the mixed liquid and the air, and increasing the dissolved oxygen content. Compared with a simple submersible aerator, its aeration volume is further increased. On the one hand, more air is brought into the water, and on the other hand, more oxygen is incorporated into the water body, effectively improving the dissolved oxygen efficiency.

[0043] Preferably, considering the power of the submersible pump, the speed of the steam-water mixture, the flow channel size, and the distance H from the upper end of the aeration pipe to the liquid surface comprehensively, the height of the steam-water mixture ejected from the aeration pipe 4 exceeding the liquid surface is set. Generally, the steam-water mixture ejected from the aeration pipe 4 exceeds the liquid surface by more than 100 - 300 mm. The greater the ejection height, the longer the contact time and area between the water droplets and the air, and more air will be brought into the water to increase the aeration volume.

[0044] As a preferred example, as Figure 2 shown, the aeration pipe 4 includes a constant-speed pipe section 43 and a diffusion pipe section 42. One end of the constant-speed pipe section 43 is connected to the mixing disk 5, and the other end is connected to the diffusion pipe section 42. The constant-speed pipe section 43 is cylindrical, and the speed of the steam-water mixture remains unchanged when flowing through the constant-speed pipe section. At the same time, the steam-water mixture continues to mix evenly in the constant-speed pipe section. The diffusion pipe section 42 is conical, and the diameter of the diffusion pipe section 42 gradually increases from the inlet end to the outlet end. When the steam-water mixture passes through the diffusion pipe section, the fluid cross-section of the steam-water mixture gradually becomes larger, the diameter of the ejected steam-water mixture becomes larger, and more air is absorbed. Moreover, the coverage range of the steam-water mixture on the water surface after falling becomes larger, that is, the water body range for the third steam-water mixture to undergo oxygen transfer becomes larger, thereby increasing the dissolved oxygen range.

[0045] Further preferably, the aeration pipe 4 further includes a partition plate 41. The partition plate 41 is arranged in the diffusion pipe section 42, and the partition plate 41 and the center line of the diffusion pipe section 42 are in the same plane. Preferably, the partition plate 41 is parallel to the axis of the submersible pump, and the partition plate divides the diffusion pipe section into two equal channels in the width direction.

[0046] In step 40), when the steam-water mixture passes through the diffuser pipe section, the steam-water mixture sprays out rapidly in all directions from the outlets of the two channels, increasing the spraying range in the width direction (tank width). The steam-water mixture ejected from the aeration pipe continuously mixes with the surrounding water body. The oxygen in the steam-water mixture continuously dissolves into the surrounding water body, and the oxygenated water body flows forward under the action of the second impeller 7. Other water bodies with less oxygen continuously fill this position. Since the new water body has less oxygen content and a greater difference from the oxygen saturation, it is easier to absorb oxygen, thus increasing the oxygen transfer rate. The oxygen in the steam-water mixture continuously dissolves into the new water body, and oxygen transfer occurs around the aeration pipe, enhancing the dissolved oxygen effect at the top of the water body. When the steam-water mixture in the aeration pipe sprays upward, the adjacent parts of the two water flows cut and collide with each other, making the water droplets and bubbles finer, and then mixing with the water body. At the same time, the remaining parts of the two water flows directly mix with the surrounding water body, enabling more oxygen to dissolve into the water body. Since the flow field formed by the aeration pipe and the flow field formed by the steam-water mixture ejected from the adjacent flow channels have different directions and are not in the same plane, the two different-direction flow fields interact and merge with each other, making the water droplets and bubbles finer and enabling oxygen to continuously dissolve into the water body, further increasing the oxygen transfer rate. The steam-water mixture after transferring oxygen to the water body continues to move upward and takes out some water bodies above the water surface, forming a new second-generation steam-water mixture containing a small amount of oxygen, which becomes finer water droplets. These fine water droplets continuously mix with the air, enabling more air to mix with the second-generation steam-water mixture again. Since the water droplets are fine, more air can be absorbed for the second aeration, continuously increasing the oxygen content in the steam-water mixture and forming a new third-generation steam-water mixture. When the third-generation steam-water mixture falls into the water surface, the diameter of the water surface it covers is equal to the maximum diameter of the steam-water mixture ejected from the aeration pipe in the air, which is larger than the diameter when the second-generation steam-water mixture gushes out of the water surface, increasing the contact area with the water body below the water surface, thus enhancing the dissolved oxygen efficiency. Moreover, after the third-generation steam-water mixture falls into the water body, it moves downward, with a different flow direction from the steam-water mixture just ejected from the aeration pipe and the steam-water mixture ejected underwater from the adjacent flow channels. The steam-water mixtures in different directions interact and merge with each other to form finer water droplets and bubbles, forming a composite flow field, greatly enhancing the dissolved oxygen effect above the axis of the submersible pump.After the third-generation steam-water mixture falls onto the water surface, it first continuously mixes with the surface water body for the second oxygen transfer; then, under the influence of its own kinetic energy and potential energy, the steam-water mixture continues to move downward for a certain distance. While continuously mixing with the water body for the second oxygen transfer, it also interacts and merges with the steam-water mixture just ejected from the aeration pipe and the steam-water mixture ejected underwater in adjacent channels, forming finer water droplets, bubbles, and a composite flow field, so that the oxygen in the steam-water mixture is fully transferred into the water body; finally, under the action of the second impeller 7, the steam-water mixture with a higher oxygen content moves forward rapidly, thus increasing the movement path of the steam-water mixture. The longer the movement path, the higher the oxygen transfer rate, and the more air entering the water dissolves into the water as oxygen, that is, the higher the dissolved oxygen content.

[0047] As a preferred example, the number of aeration pipes 4 is 3. One of the aeration pipes 4 is arranged at the water outlet at the topmost end of the mixing tray 5, and the distance from the water outlet of this flow channel 51 to the water surface is the minimum size. The other two are symmetrically distributed at the water outlets of the adjacent flow channels on both sides of this water outlet. The angle between any two adjacent flow channels of the mixing tray 5 where the aeration pipes are installed is less than or equal to the angle between adjacent flow channels when the flow channels of the mixing tray are evenly distributed, so that the steam-water mixtures ejected from these flow channels interact and collide with each other, forming finer water droplets, increasing the surface area of the water droplets, that is, increasing the contact area between the water droplets and the air, and increasing the dissolved oxygen content.

[0048] In step 40), when the water - air mixture in a single aeration pipe sprays upward, the adjacent parts of the two water flows cut and collide with each other, making the water droplets and bubbles finer. Then they mix with the water body. At the same time, the remaining parts of the two water flows directly mix with the surrounding water body, enabling more oxygen to dissolve into the water body. Since aeration pipes 4 are arranged at the top - most water outlet and its two side water outlets, and due to the small interval between adjacent flow channels, when the three water - air mixtures spray out from the aeration pipes 4 at high speed, the water - air mixtures continuously mix with the surrounding water body, achieving the first oxygen transfer. Meanwhile, the edges of the adjacent water - air mixtures collide, making the water droplets and air finer, and the oxygen in the mixture continuously dissolves into the water body, thus increasing the oxygen transfer rate. When each water - air mixture surges out of the water surface with part of the water body, a fine fountain of the second - generation water - air mixture higher than the water surface by a certain distance is formed. This fountain contacts the surrounding air, and the air continuously dissolves into the water - air mixture for the second aeration. During this process, the mixture undergoes two different upward and downward movements, thus increasing the movement path and the aeration volume. The oxygen content in the water - air mixture continuously increases, and the third - generation water - air mixture containing more oxygen falls into the water surface. Since the height of the upper end of the middle aeration pipe 4 from the water surface is the smallest, and the upper - end heights of the left - and right - side aeration pipes are lower than that of the middle aeration pipe, the heights of the two - side fountains are lower than that of the middle fountain. After the middle fine fountain mixes with the air and runs to the maximum height, it changes direction and moves downward, and mixes with the air again during the movement. The mixed water - air mixture collides with the edges of the fountains on the adjacent two sides lower than its own height, making the water droplets finer, and thus bringing more air into the water. When the third - generation water - air mixture falls into the water surface, the diameter of the water body surface covered by each aeration pipe is equal to the maximum diameter of the water - air mixture ejected from the corresponding aeration pipe in the air, which is larger than the respective diameters when the second - generation water - air mixtures surge out of the water surface, increasing the contact area with the water body below the water surface, and thus improving the dissolved - oxygen efficiency. After the third - generation water - air mixture falls to the water surface, first, it continuously mixes with the surface water body for the second oxygen transfer; then, under the action of its own kinetic energy and potential energy, the water - air mixture continues to move downward for a certain distance. While continuously mixing with the water body for the second oxygen transfer, it also interacts and merges with the water - air mixture just ejected from the aeration pipe and the water - air mixture sprayed underwater in the adjacent flow channel.

[0049] As a preferred example, a second impeller 7 is also installed at the end of the rotor shaft of the submersible electric pump 1 in the submersible aerator in the method of this embodiment, and it is located outside the mixing disk 5. Preferably, the distance between the second impeller 7 and the mixing disk 5 is greater than or equal to 50 mm to ensure that the fluid enters the mixing disk 5. The second impeller 7 has an axial - flow structure, and its function is to generate the fluid moving forward.

[0050] The method of this embodiment further includes:

[0051] Step 50) The rotating second impeller 7 continuously pushes the steam-water mixture forward. The second impeller 7 continuously pushes the oxygenated water body forward, while causing the water body with less oxygen at the rear end to fill in, so that the oxygen in the steam-water mixture is transferred to the new water body in time. The second impeller mixes the fluid with a higher oxygen content and the fluid with a lower oxygen content at the front end with each other. The rotating second impeller cuts the steam-water mixture to form finer water droplets and bubbles. The rotation of the second impeller prevents the precipitation of activated sludge, enabling more oxygen to dissolve in the activated sludge.

[0052] In this embodiment, a second impeller is provided at the front end of the mixing disk 5, which has the following effects: First, after the steam-water mixture ejected from the flow channel without an aeration pipe is mixed with the surrounding water for oxygen transfer, the second impeller quickly brings the fluid with a higher oxygen content on the plane perpendicular to the axis of the submersible pump to the front end, avoiding oxygen saturation and affecting the dissolved oxygen efficiency; at the same time, the fluid with a lower oxygen content quickly fills the vacancy from the rear end. Since the new water body has a low oxygen content and a larger difference from the oxygen saturation value, it is easier to absorb oxygen, thereby increasing the oxygen transfer rate and enabling the steam-water mixture to perform oxygen transfer in a timely manner to improve the oxygen transfer efficiency. Second, while the first-generation steam-water mixture ejected from the aeration pipe realizes the first oxygen transfer below the liquid level, the second impeller quickly moves the fluid with a higher oxygen content to the front end, avoiding oxygen saturation and allowing the fluid with a lower oxygen content to quickly fill the vacancy. Since the new water body has a low oxygen content and a larger difference from the oxygen saturation value, it is easier to absorb oxygen, thereby increasing the oxygen transfer rate and enabling the steam-water mixture to perform oxygen transfer in a timely manner to improve the oxygen transfer efficiency; at the same time, the second-generation steam-water mixture pre-ejected from the water surface contains less oxygen, so that it can absorb more air on the water surface to improve the effect of the second aeration. Third, while the third-generation steam-water mixture moves underwater for the second oxygen dissolution, the second impeller also quickly pushes the fluid with a higher oxygen content forward, avoiding oxygen saturation and allowing the fluid with a lower oxygen content to quickly fill the vacancy. Since the new water body has a low oxygen content and a larger difference from the oxygen saturation value, it is easier to absorb oxygen, thereby increasing the oxygen transfer rate and enabling the steam-water mixture to perform oxygen transfer in a timely manner to improve the oxygen transfer efficiency. Fourth, the fluid with a lower oxygen content at the rear end of the aerator fills the vacancy in a timely manner to carry out the next cycle of efficient aeration and oxygen dissolution process. Fifth, it prevents the precipitation of activated sludge and dissolves more oxygen in the activated sludge to improve the dissolved oxygen efficiency. Among them, during the process of the second impeller moving the fluid after oxygen dissolution to the front end, it has three functions: First, it mixes the fluid with a higher oxygen content and the fluid with a lower oxygen content at the front end, making these fluids fully mixed and uniform, so that the oxygen content is evenly distributed to meet the absorption of aerobic bacteria and continuously improve the water quality; Second, it has a pushing flow function, moving the mixed fluid to the front end in a timely manner, increasing the moving path of the steam-water mixture, and further improving the oxygen transfer efficiency; Third, the second impeller rotating at high speed cuts the steam-water mixture to form finer water droplets and bubbles to increase the oxygen transfer rate.

[0053] Further preferably, a flow dividing plate 6 is vertically provided between the second impeller 7 and the mixing disk 5. The flow dividing plate 6 is used to divide the water body at the front end of the mixing disk 5, separate the water body between the first impeller 8 and the second impeller 7, reasonably distribute and guide the water entering the two impellers, ensure the normal operation of the two impellers, and respectively realize the aeration function and the mixing, pushing flow and oxygen dissolution functions.

[0054] The high-efficiency submersible aeration method of the above preferred embodiment includes:

[0055] Start the submersible aerator. The first impeller 8 rotating at high speed forms a negative pressure in the mixing chamber of the mixing disk 5. The air on the water surface sequentially enters the mixing chamber of the mixing disk 5 through the air inlet pipe 3 and the air inlet disk 2. The air and the fluid are mixed in the mixing chamber to form the first-generation steam-water mixture, realizing the first aeration.

[0056] The steam-water mixture is tangentially ejected from each flow channel of the mixing disk around the axis of the submersible pump and is circumferentially injected into the water body in a plane perpendicular to the axis of the submersible pump, continuously mixing with the water body, and continuously dissolving the air in the steam-water mixture into the surrounding water body to achieve oxygen transfer. Since the steam-water mixtures ejected from each flow channel are not in the same direction, the flow fields in the depth direction interact and merge with each other, enabling more oxygen to dissolve in the water, improving the oxygen transfer efficiency in the plane perpendicular to the axis of the submersible pump, and improving the uniformity of dissolved oxygen at the bottom, middle, and top of the water body.

[0057] Among them, the steam-water mixture entering the flow channel provided with the aeration pipe enters the aeration pipe from the flow channel, is continuously mixed evenly in the aeration pipe, and forms two fluid streams under the action of the partition plate, which are respectively ejected rapidly in all directions from the outlets of the two channels, increasing the spraying range in the width direction. The steam-water mixture ejected from the aeration pipe continuously mixes with the surrounding water body, and the oxygen in the steam-water mixture continuously dissolves into the surrounding water body to achieve the first oxygen transfer. When the steam-water mixture in a single aeration pipe is ejected upward, the adjacent parts of the two water streams cut and collide with each other, making the water droplets and bubbles finer, and then mixing with the water body. At the same time, the remaining parts of the two water streams directly mix with the surrounding water body, enabling more oxygen to dissolve into the water body. Since the flow field formed by the aeration pipe is different from the flow field formed by the steam-water mixture ejected from the adjacent flow channel and is not in the same plane, the two flow fields in different directions interact and merge with each other, making the water droplets and bubbles finer and enabling oxygen to continuously dissolve into the water body, further improving the oxygen transfer rate. If three aeration pipes are provided, the three steam-water mixtures are respectively ejected from the aeration pipe 4 at high speed, and the steam-water mixtures continuously mix with the surrounding water body to achieve the first oxygen transfer. At the same time, the edges of the adjacent steam-water mixtures collide with each other, making the water droplets and air finer, and the oxygen in the mixture continuously dissolves into the water body, thereby improving the oxygen transfer rate. The oxygenated water body flows forward under the action of the second impeller 7, and other water bodies with less oxygen continuously fill this position. Since the new water body has less oxygen content and a larger difference from the oxygen saturation value, it is easier to absorb oxygen, thereby increasing the speed of oxygen transfer and enabling the oxygen in the steam-water mixture to continuously dissolve into the new water body.

[0058] When the water-steam mixture per share gushes out from the water surface with part of the water body, a fine fountain of the second-generation water-steam mixture higher than the liquid surface by a certain distance is formed. This fountain comes into contact with the surrounding air, and the air continuously dissolves into the water-steam mixture for the second aeration. During this process, the mixture undergoes two different directions of movement, upward and downward, thereby increasing the movement path and improving the aeration volume. The oxygen content in the water-steam mixture continuously increases, and the third-generation water-steam mixture containing more oxygen falls onto the water surface. Since the upper end of the middle aeration pipe 4 is at the minimum height from the liquid surface, and the upper ends of the aeration pipes on the left and right sides are lower than the upper end of the middle aeration pipe, the fountains on both sides are lower than the middle fountain. After the middle fine fountain mixes with the air and runs to the maximum height, it changes direction and moves downward, and mixes with the air again during the movement. The mixed water-steam mixture collides with the edges of the fountains on the adjacent lower sides, making the water droplets finer, thereby bringing more air into the water. After the third-generation water-steam mixture falls onto the water surface, first, it continuously mixes with the surface water body for the second oxygen transfer; then, under the action of its own kinetic energy and potential energy, the water-steam mixture continues to move downward for a certain distance. While continuously mixing with the water body for the second oxygen transfer, it also interacts and merges with the water-steam mixture just ejected from the aeration pipe and the water-steam mixture ejected underwater in the adjacent flow channels, forming finer water droplets, bubbles and a composite flow field; finally, under the action of the second impeller 7, the water-steam mixture quickly moves forward to the front end, thereby increasing the movement path of the water-steam mixture. The longer the movement path, the higher the oxygen transfer rate, that is, the more air enters the water and the more oxygen dissolves into the water, that is, the higher the dissolved oxygen content. Since the new water body at the front end has a low oxygen content and a greater difference from the oxygen saturation value, it is easier to absorb oxygen, thus improving the oxygen transfer speed.

[0059] During the first and second oxygen transfer processes, the rotating second impeller 7 continuously pushes the water-steam mixture forward to increase the movement path of the water-steam mixture and further improve the oxygen transfer efficiency. At the same time, it pushes the water body after oxygen dissolution forward, so that the water body with less oxygen at the rear fills this position, and the oxygen in the water-steam mixture continuously dissolves into the new water body. The second impeller mixes the fluid with a higher oxygen content and the fluid with a lower oxygen content at the front end, making these fluids fully mixed and uniform, so that the oxygen content is evenly distributed to meet the absorption of aerobic bacteria and continuously improve the water quality. The high-speed rotating second impeller cuts the water-steam mixture to form finer water droplets and bubbles to increase the oxygen transfer rate. The rotation of the second impeller prevents the precipitation of activated sludge, so that more oxygen dissolves in the activated sludge to improve the dissolved oxygen efficiency.

[0060] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An efficient submersible aeration method, characterized in that, The method includes the following steps: Step 10): Install the submersible aerator into the water body. The submersible pump (1), air inlet disc (2) and mixing disc (5) of the submersible aerator are arranged in sequence in the transverse direction. The centerlines of the water outlets of all the flow channels of the mixing disc (5) are located on the same vertical plane perpendicular to the axis of the submersible pump (1). Step 20): Start the submersible aerator. The rotating first impeller (8) forms a negative pressure in the mixing chamber of the mixing disc (5). The air on the water surface enters the mixing chamber of the mixing disc (5) through the air inlet pipe (3) and the air inlet disc (2) in sequence. The air and water are mixed in the mixing chamber to form the first-generation steam-water mixture, realizing the first aeration. Step 30): The steam-water mixture is tangentially ejected from each flow channel of the mixing disc (5) around the axis of the submersible pump and is circumferentially injected into the water body on the vertical plane perpendicular to the axis of the submersible pump, continuously mixing with the water body, and continuously dissolving the air in the steam-water mixture into the surrounding water body, realizing oxygen transfer. The steam-water mixture ejected from each flow channel enters the water body at different depths, thereby aerating the water body in the depth direction, improving the balance of dissolved oxygen at the bottom, middle and top of the water body, and at the same time improving the dissolved oxygen effect in the width direction of the water body. The flow fields generated by the steam-water mixture ejected from different flow channels interact and merge with each other, enabling more oxygen to dissolve in the water and improving the oxygen transfer efficiency on the vertical plane perpendicular to the axis of the submersible pump. At the water outlet of the flow channel where the water outlet of the mixing disc is located at the topmost position, an air diffuser pipe (4) is provided. The method further includes: Step 40): The steam-water mixture in the flow channel provided with the air diffuser pipe enters the air diffuser pipe from the flow channel and is continuously mixed evenly in the air diffuser pipe. When the steam-water mixture is ejected from the air diffuser pipe (4), it moves upward. During the upward movement, the steam-water mixture continuously mixes with the surrounding water body, and the oxygen in the steam-water mixture continuously dissolves into the surrounding water body, realizing the first oxygen transfer. When the steam-water mixture gushes upward from the liquid surface with part of the water body, a second-generation steam-water mixture is formed. The second-generation steam-water mixture forms a fountain of fine water droplets above the liquid surface. The fountain contacts the surrounding air, and the air continuously dissolves into the steam-water mixture, realizing the second aeration. The oxygen content in the second-generation steam-water mixture continuously increases, forming a third-generation steam-water mixture containing more oxygen that falls onto the water surface. After the third-generation steam-water mixture falls onto the water surface, it mixes with the surface water body to conduct the second oxygen transfer. While the steam-water mixture continues to move downward and continuously mixes with the water body for the second oxygen transfer, it also interacts and merges with the steam-water mixture just ejected from the air diffuser pipe and the steam-water mixture ejected underwater from the adjacent flow channels. A partition plate (41) is provided in the air diffuser pipe (4), and the partition plate (41) is on the same plane as the centerline of the air diffuser pipe (4). In the step 40), the steam-water mixture in the flow channel of the aeration pipe (4) enters the aeration pipe from the flow channel, continuously mixes evenly in the aeration pipe, and forms two steam-water mixtures under the action of the partition plate (41), which are respectively ejected rapidly around from the outlets of the two channels, increasing the spraying range in the width direction; when the steam-water mixture in the aeration pipe is ejected upward, the adjacent parts of the two steam-water mixtures cut and collide with each other, making the water droplets and bubbles finer, and then mixing with the surrounding water body. At the same time, the rest of the two steam-water mixtures directly mix with the surrounding water body for the first oxygen transfer, enabling more oxygen to dissolve into the water body; A second impeller (7) is further installed at the end of the rotor shaft of the submersible motor pump (1), and the second impeller (7) is located outside the mixing disc (5); The method further includes: Step 50) The rotating second impeller (7) continuously pushes the steam-water mixture forward, improving the movement path of the steam-water mixture and further enhancing the oxygen transfer efficiency; the second impeller (7) continuously pushes the water body after dissolved oxygen forward, while enabling the water body with less oxygen at the rear end to fill in, so that the oxygen in the steam-water mixture continuously dissolves into the new water body; the second impeller mixes the fluid with a higher oxygen content and the fluid with a lower oxygen content at the front end, making these fluids fully mixed evenly, so that the oxygen content distribution is uniform, meeting the absorption effect of aerobic bacteria to continuously improve the water quality; the rotating second impeller cuts the steam-water mixture to form finer water droplets and bubbles to increase the oxygen transfer rate; the rotation of the second impeller prevents the precipitation of activated sludge, enabling more oxygen to dissolve in the activated sludge to improve the dissolved oxygen efficiency.

2. The efficient diving aeration method according to claim 1, wherein The water outlets of the mixing disc are also provided with aeration pipes (4) at the water outlets of the adjacent two channels of the topmost flow channel; In the step 40), when the three steam-water mixtures are ejected from the aeration pipe (4) at high speed, the steam-water mixture continuously mixes with the surrounding water body for the first oxygen transfer; at the same time, the edges of the adjacent steam-water mixtures collide, making the water droplets and air finer, and the oxygen in the mixture continuously dissolves into the water body for the first oxygen transfer, thereby increasing the oxygen transfer rate.

Images