A micro-nano bubble generator for removing pollutants from water

Abstract

This invention belongs to the technical field of wastewater treatment equipment, specifically a micro / nano bubble generator for removing pollutants from water. It includes a mounting frame with a driving element installed at one end. Multiple ceramic membrane discs are uniformly mounted axially on a rotating shaft. A gas channel is provided at the end of the shaft away from the driving element. A through groove is provided on the side wall of the shaft to connect the gas channel and the ceramic membrane discs. Each ceramic membrane disc is coaxially fitted with an insulating flow guide shroud made of a high-dielectric material. A uniform and controllable annular flow guide gap is formed between the insulating flow guide shroud and the ceramic membrane disc. During operation, the bubbles rub and collide with the inner wall of the insulating flow guide shroud to enhance the separation of the double electric layer charge on the bubble surface. This structural combination can prevent direct erosion and wear of the membrane disc micropores by particles in the wastewater. Simultaneously, it significantly increases the zeta potential of the bubble surface, enhances the electrostatic repulsion between bubbles, and effectively inhibits bubble aggregation.

Description

Technical Field

[0001] This invention belongs to the technical field of wastewater treatment equipment, specifically a micro-nano bubble generator for removing pollutants from water. Background Technology

[0002] With increasingly stringent requirements for water environment management, micro-nano bubble technology, with its advantages such as large bubble specific surface area, long residence time in water, high interfacial reactivity, and the ability to spontaneously generate oxidizing active substances, has been widely applied in fields such as black and odorous water body remediation, industrial wastewater treatment, aquaculture water purification, and aquatic environment ecological restoration. High-speed rotary micro-nano bubble generators, as one of the mainstream generating devices, generally use sintered metal sheets or ceramic microporous sheets as the core bubble generating components. Relying on a main shaft to drive a ceramic membrane disk to rotate at high speed, the internal gas is ejected at high speed through the microporous structure and, combined with hydraulic shearing, stably generates micro-nano bubbles.

[0003] However, the above technologies still have the following drawbacks: wastewater generally contains impurities such as silt, hard suspended solids, and inorganic particles. When the equipment is running, the high-speed rotating microporous generating plate forms a high-intensity relative motion with the wastewater. The water flow carries hard particles and continuously scours and erodes the outer side and orifice of the sintered metal plate and ceramic microporous plate. Long-term operation can easily cause wear on the micropore edges, enlargement of the pore size, and deformation of the pores, resulting in a continuous decline in bubble generation performance and a short service life of the core components. At the same time, the micro-nano bubbles themselves have limited negative charge at the interface and low Zeta potential values. Due to the complex content of electrolytes and colloidal impurities in the wastewater, the electrostatic repulsion between bubbles will be further weakened, making micro-nano bubbles prone to coalescence, growth, rapid floating and dissipation. The effective working time of the bubbles is shortened, and the gas-liquid mass transfer efficiency and pollutant purification effect are significantly restricted.

[0004] Therefore, the present invention provides a micro-nano bubble generator for removing pollutants from water. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The micro-nano bubble generator for removing pollutants in water according to the present invention includes a mounting frame. A driving element is installed at one end of the mounting frame. The output end of the driving element is connected to a rotating shaft. Multiple ceramic membrane disks are uniformly installed on the rotating shaft along the axial direction. A gas channel is opened at the end of the rotating shaft away from the driving element. A through groove is opened on the side wall of the rotating shaft for connecting the gas channel and the ceramic membrane disk. An insulating guide cover is coaxially sleeved on the outside of each ceramic membrane disk. One side of the insulating guide cover is fixedly connected to the mounting frame. A uniform and controllable annular guide gap is formed between the insulating guide cover and the ceramic membrane disk. The insulating guide cover is a non-closed structure with a bubble outlet in its circumference. An air injection mechanism for connecting to a gas source is fixedly installed at the other end of the mounting frame. The exhaust end of the air injection mechanism is sealed and connected to the gas channel of the rotating shaft.

[0007] During operation, the bubbles rub and collide with the inner wall of the insulating flow guide to enhance the separation of the double electric layer charge on the bubble surface.

[0008] Furthermore, the rotating shaft is composed of a drive shaft, several gas supply shafts, and a supporting gas guide shaft coaxially spliced ​​together in sequence. The drive shaft is connected to the output end of the drive element. The gas channel is opened inside the gas supply shaft and the supporting gas guide shaft. The gas channel of the supporting gas guide shaft is sealed and connected to the exhaust end of the gas injection mechanism. The mating end face of each splicing section is provided with a mutually compatible transmission concave-convex connection structure, and the splicing sections are sealed and fitted together.

[0009] Furthermore, the gas injection mechanism includes a mounting base, a guide cylinder, an ejector spring, and a gas delivery sleeve. The mounting base is fixedly connected to the mounting frame. The guide cylinder is fixedly mounted on one side of the mounting base. The gas delivery sleeve is slidably fitted inside the guide cylinder. The ejector spring abuts against the gas delivery sleeve and the mounting base. The exhaust end of the gas delivery sleeve is sealed and connected to the inlet end of the supporting air guide shaft. A gas source is connected to one side of the guide cylinder.

[0010] Furthermore, the inner wall of the insulating guide shroud is integrally formed with several guide strips, which guide the water from the gap between the rotating shaft and the insulating guide shroud to the periphery of the ceramic membrane disk.

[0011] Furthermore, the spacing between adjacent guide strips near the rotating shaft end is 0.5-2 mm.

[0012] Furthermore, the guide strip is an arc-shaped strip structure, and its bending direction is consistent with the rotation direction of the ceramic diaphragm disk.

[0013] Furthermore, the number of bubble outlets is 2-4, which are evenly distributed around the circumference of the insulating guide shroud, and the opening direction is consistent with the rotational tangent direction of the ceramic diaphragm disk.

[0014] The beneficial effects of this invention are as follows:

[0015] The present invention discloses a micro-nano bubble generator for removing pollutants from water. By setting an independent insulating flow guide cover on the outside of each ceramic membrane disk, the cover directly blocks the direct erosion of the micropores of the membrane disk by particles in the water, reducing particle accumulation and erosion wear, and improving the service life of the ceramic membrane disk. At the same time, the friction and impact between the insulating flow guide cover and the bubbles make the surface charge separation of the bubbles more complete, significantly increasing the zeta potential of the bubble surface, enhancing the electrostatic repulsion between bubbles, and effectively inhibiting the aggregation of bubbles. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is a perspective view of the invention from another angle;

[0019] Figure 3 yes Figure 2 A half-section view;

[0020] Figure 4 This is a perspective view of the components of the rotating shaft in this invention;

[0021] Figure 5 This is a schematic diagram of the structure of the insulating flow guide in this invention;

[0022] Figure 6 yes Figure 5 A half-section view.

[0023] In the diagram: 1. Mounting bracket; 2. Drive element; 3. Rotating shaft; 4. Ceramic diaphragm; 5. Insulating guide shroud; 6. Gas injection mechanism; 7. Bubble outlet; 8. Guide strip; 9. Gas passage; 10. Through groove; 30. Drive shaft; 31. Gas delivery shaft; 32. Supporting guide shaft; 60. Mounting base; 61. Guide cylinder; 62. Ejection spring; 63. Gas delivery sleeve. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0025] Example 1: As Figures 1 to 6As shown in the figure, a micro-nano bubble generator for removing pollutants from water according to an embodiment of the present invention includes a mounting frame 1. A driving element 2 is mounted on one end of the mounting frame 1. A rotating shaft 3 is connected to the output end of the driving element 2. A plurality of ceramic membrane disks 4 are uniformly mounted on the rotating shaft 3 along the axial direction. A gas channel 9 is opened at the end of the rotating shaft 3 away from the driving element 2. A through groove 10 is opened on the side wall of the rotating shaft 3 to connect the gas channel 9 and the ceramic membrane disks 4. The rotating shaft 3 is driven to rotate by the driving element 2, thereby causing the rotating shaft 3 to drive the ceramic membrane disks 4 to rotate synchronously. Gas enters the internal gas cavity of the ceramic membrane disk 4 through the gas channel 9 and the through groove 10 in sequence. The gas seeps out through the micron-sized permeable micropores of the ceramic membrane disk 4 to form initial bubbles.

[0026] Each ceramic diaphragm disc 4 is coaxially fitted with an insulating flow guide shroud 5, which is made of high dielectric material. One side of the insulating flow guide shroud 5 is fixedly connected to the mounting bracket 1. A uniform and controllable annular flow guide gap is formed between the insulating flow guide shroud 5 and the ceramic diaphragm disc 4. The insulating flow guide shroud 5 is a non-closed structure with a bubble outlet 7 in its circumference. The other end of the mounting bracket 1 is fixedly equipped with an air injection mechanism 6 for connecting to the air source. The exhaust end of the air injection mechanism 6 is sealed and connected to the gas channel 9 of the rotating shaft 3. The friction and impact between the bubble and the inner wall of the insulating flow guide shroud 5 enhance the separation of the double electric layer charge on the bubble surface.

[0027] like Figure 3 and Figure 4 As shown, the rotating shaft 3 is composed of a drive shaft 30, several gas supply shafts 31, and a supporting gas guide shaft 32, which are coaxially spliced ​​together in sequence. The drive shaft 30 is connected to the output end of the drive element 2. The gas channel 9 is opened inside the gas supply shaft 31 and the supporting gas guide shaft 32. The gas channel 9 of the supporting gas guide shaft 32 is sealed and connected to the exhaust end of the gas injection mechanism 6. The mating end faces of the drive shaft 30, the gas supply shaft 31, and the supporting gas guide shaft 32 are respectively provided with mutually compatible convex keys and keyways. The convex keys and keyways are evenly distributed circumferentially along the shaft end face, and are rectangular in shape. The number, position, and outline of the convex keys and keyways are completely corresponding. When each shaft segment is coaxially spliced, the convex key is embedded in the corresponding keyway to realize torque transmission and circumferential positioning between adjacent shaft segments. At the same time, with the seals at the end face or inner hole, the sealing fit between each spliced ​​segment is ensured, so that the gas channel 9 is continuously conductive at the splice and there is no gas leakage. This makes the rotating shaft 3 easy to splice and assemble, and can be quickly replaced and repaired according to the actual wear condition of the ceramic diaphragm plate 4.

[0028] like Figure 3As shown, the gas injection mechanism 6 includes a mounting base 60, a guide cylinder 61, an ejector spring 62, and a gas delivery sleeve 63. The mounting base 60 is fixedly connected to the mounting frame 1. The guide cylinder 61 is fixedly mounted on one side of the mounting base 60. The gas delivery sleeve 63 is slidably fitted inside the guide cylinder 61. The ejector spring 62 abuts against the gas delivery sleeve 63 and the mounting base 60. The exhaust end of the gas delivery sleeve 63 is sealed and connected to the inlet end of the supporting air guide shaft 32. A gas source is connected to one side of the guide cylinder 61. Gas is delivered to the gas channel 9 of the rotating shaft 3 through the gas delivery sleeve 63. At the same time, the elastic preload of the ejector spring 62 ensures the dynamic seal between the gas delivery sleeve 63 and the rotating shaft 3, preventing gas leakage.

[0029] like Figure 5 and Figure 6 As shown, the inner wall of the insulating guide shroud 5 is integrally formed with several guide strips 8. The several guide strips 8 guide the water from the gap between the rotating shaft 3 and the insulating guide shroud 5 to the periphery of the ceramic membrane disk 4, so that the generated bubbles can eventually all flow into the periphery of the ceramic membrane disk 4.

[0030] The adjacent spacing of the guide strips 8 near the end of the rotating shaft 3 is 0.5-2 mm, so that several guide strips 8 near the end of the rotating shaft 3 form a filter screen structure, which can filter the sewage entering through the opening of the insulating guide cover 5 near the rotating shaft 3, and avoid the erosion and wear of the ceramic membrane disk 4 by large particulate impurities contained in the sewage.

[0031] The guide strip 8 is an arc-shaped strip structure, and its bending direction is consistent with the rotation direction of the ceramic membrane disk 4, so that the air bubbles in the water can smoothly flow into its surrounding area as the ceramic membrane disk 4 rotates.

[0032] There are 2-4 bubble outlets 7, which are evenly distributed around the circumference of the insulating guide shroud 5 and the opening direction is consistent with the rotation tangent direction of the ceramic diaphragm disk 4, so that the bubbles that gather in the circumferential area of ​​the insulating guide shroud 5 can be smoothly discharged from the bubble outlets 7.

[0033] Working principle:

[0034] Gas delivery and initial bubble generation: The gas to be dissolved, such as air, ozone, or oxygen, is delivered to the gas channel 9 of the rotating shaft 3 through the gas delivery sleeve 63 by the gas injection mechanism 6. The gas enters the internal gas cavity of each ceramic diaphragm 4 through the through groove 10 on the side wall of the rotating shaft 3, and finally seeps out through the micron-level permeable micropores of the ceramic diaphragm 4 to form initial bubbles. The ejector spring 62 in the gas injection mechanism 6 can ensure the dynamic seal between the gas delivery sleeve 63 and the rotating shaft 3 through the elastic pre-tightening force to avoid gas leakage.

[0035] Rotational shearing and bubble refinement: The driving element 2 drives the rotating shaft 3, which is spliced ​​together by the transmission shaft 30, the gas delivery shaft 31, and the supporting gas guide shaft 32, to rotate at high speed. Each spliced ​​segment achieves synchronous transmission through the transmission concave-convex connection structure of the docking end face to ensure rotational stability. The ceramic diaphragm disk 4 rotates coaxially with the rotating shaft 3. The annular flow guide gap between its periphery and the insulating flow guide shroud 5 forms a strong shear flow field. The initial bubbles are refined into micro-nano-scale bubbles under the action of shear force.

[0036] Charge enhancement and bubble stabilization: The insulating guide shroud 5 is made of high dielectric insulating material. When the micro-nano bubbles move with the swirling flow in the annular gap, they continuously rub and collide with the inner wall of the insulating guide shroud 5 and the radial guide strips 8, which enhances the separation of the double electric layer charge on the bubble surface and increases the absolute value of the bubble potential. At the same time, the radial guide strips 8 with arc structure bend in the same direction as the rotation direction of the ceramic diaphragm disk 4, so as to guide the water flow from the side of the rotating shaft 3 into the peripheral area of ​​the ceramic diaphragm disk 4 in an orderly manner, avoiding flow field turbulence. With the tangentially set bubble outlet 7, the bubble movement direction is consistent, reducing disordered collisions and coalescence.

[0037] Gas-liquid mixing and pollutant removal: Highly charged micro-nano bubbles are discharged along the tangential bubble outlet 7, forming a uniformly diffused gas-liquid mixture in the water. With their large specific surface area and long residence time, the bubbles efficiently remove organic pollutants, heavy metal ions, and suspended particulate matter from the water through oxidation (such as ozone bubbles) and flotation (such as air bubbles).

Claims

1. A micro / nano bubble generator for removing pollutants from water, comprising a mounting frame (1), wherein a driving element (2) is mounted on one end of the mounting frame (1), and a rotating shaft (3) is connected to the output end of the driving element (2), characterized in that: Multiple ceramic diaphragm discs (4) are uniformly installed along the axial direction on the rotating shaft (3). A gas channel (9) is opened at the end of the rotating shaft (3) away from the driving element (2). A through groove (10) for connecting the gas channel (9) and the ceramic diaphragm disc (4) is opened on the side wall of the rotating shaft (3). An insulating guide hood (5) is coaxially sleeved on the outside of each ceramic diaphragm disc (4). One side of the insulating guide hood (5) is fixedly connected to the mounting frame (1). A uniform and controllable annular guide gap is formed between the insulating guide hood (5) and the ceramic diaphragm disc (4). The insulating guide hood (5) is a non-closed structure with a bubble outlet (7) in its circumference. An air injection mechanism (6) for connecting to the gas source is fixedly installed at the other end of the mounting frame (1). The exhaust end of the air injection mechanism (6) is sealed and connected to the gas channel (9) of the rotating shaft (3). During operation, the bubble rubs and impacts the inner wall of the insulating flow guide (5) to enhance the separation of the double electric layer charge on the bubble surface.

2. The micro / nano bubble generator for removing pollutants from water according to claim 1, characterized in that: The rotating shaft (3) is composed of a drive shaft (30), several gas supply shafts (31) and a support guide shaft (32) coaxially spliced ​​together in sequence. The drive shaft (30) is connected to the output end of the drive element (2). The gas channel (9) is opened inside the gas supply shaft (31) and the support guide shaft (32). The gas channel (9) of the support guide shaft (32) is sealed and connected to the exhaust end of the gas injection mechanism (6). The docking end face of each splicing section is provided with a mutually compatible transmission concave-convex connection structure, and the splicing sections are sealed and matched.

3. The micro / nano bubble generator for removing pollutants from water according to claim 2, characterized in that: The gas injection mechanism (6) includes a mounting base (60), a guide cylinder (61), an ejector spring (62), and a gas delivery sleeve (63). The mounting base (60) is fixedly connected to the mounting frame (1). The guide cylinder (61) is fixedly mounted on one side of the mounting base (60). The gas delivery sleeve (63) is slidably fitted inside the guide cylinder (61). The ejector spring (62) abuts against the gas delivery sleeve (63) and the mounting base (60). The exhaust end of the gas delivery sleeve (63) is sealed and connected to the air inlet end of the supporting air guide shaft (32). A gas source is connected to one side of the guide cylinder (61).

4. The micro / nano bubble generator for removing pollutants from water according to claim 3, characterized in that: The inner wall of the insulating guide shroud (5) is integrally formed with several guide strips (8), which guide the water from the gap between the rotating shaft (3) and the insulating guide shroud (5) to the area around the ceramic membrane disk (4).

5. A micro / nano bubble generator for removing pollutants from water according to claim 4, characterized in that: The spacing between adjacent guide strips (8) near the rotating shaft (3) is 0.5-2 mm.

6. The micro / nano bubble generator for removing pollutants from water according to claim 5, characterized in that: The guide strip (8) is an arc-shaped strip structure, and its bending direction is consistent with the rotation direction of the ceramic diaphragm disk (4).

7. A micro / nano bubble generator for removing pollutants from water according to claim 6, characterized in that: The number of bubble outlets (7) is 2-4, which are evenly distributed along the circumference of the insulating guide shroud (5), and the opening direction is consistent with the rotation tangent direction of the ceramic diaphragm disk (4).

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