Submerged rotary ceramic membrane aeration device

Abstract

The application discloses a submerged rotary ceramic membrane aeration device, which comprises a base, a waterproof rotary motor, a rotary ceramic membrane assembly and a rotary joint. The internal air channel of the rotary ceramic membrane comprises an inner ring air collecting cavity, a plurality of air flow channels with the same size structure and an outer ring aeration cavity. The inner ring air collecting cavity is communicated with the corresponding air outlet hole of the rotary ceramic membrane and communicated with the outer ring aeration cavity through the plurality of air flow channels. The different air flow channels are independently arranged. The inner ring air collecting cavity performs secondary distribution on the air inlet, so that the air distribution is more uniform. The secondary distributed air is uniformly aerated through the air flow channels. Meanwhile, the outer ring aeration cavity at the end of the air flow channel is communicated with all the air flow channels, so that the uniformity of the aeration in the air flow channels is further ensured. The whole application can be sunk in water for use, and the installation, maintenance and application are relatively flexible and simple.

Description

Technical Field

[0001] This invention belongs to the field of rotating ceramic membrane application technology, specifically relating to an immersion rotating ceramic membrane aeration device. Background Technology

[0002] CN111888955A discloses a micro / nano bubble generating device, an air flotation device, and a liquid treatment method. The technical solution includes a frame, a micro / nano bubble generating component, a driving mechanism, a gas compressor, and a gas pipe. The micro / nano bubble generating component includes a hollow shaft with a cavity, several microporous ceramic membranes sleeved on the hollow shaft, and a support. This micro / nano bubble generating device is developed based on rotating membrane technology. The microporous ceramic membranes used directly induce the generation of nanoscale bubbles without dissolving the gas in water, resulting in small-diameter bubbles with high bubble size uniformity.

[0003] CN116675325A discloses a ceramic membrane aeration device, an ozone contact tank suitable for micro-nano aeration, and an aeration method. This technical solution can generate micro-nano bubbles. Compared to millimeter-sized bubbles produced by microporous aeration, O3-MNBs (ozone micro-nano bubbles) have a longer residence time in water, a larger specific surface area, and higher mass transfer efficiency, generating more reactive oxygen species (ROS), thereby enhancing the oxidative degradation efficiency of ozone on various pollutants. Furthermore, the aeration method described in this technical solution, combining ozone pressure, influent flow rate, and ceramic membrane pore size, can generate O3-MNBs with an average particle size of less than 50 μm. This improves the mass transfer efficiency of ozone in water, enhances free radical generation, and avoids the use of high-energy-consuming equipment such as dissolved air pumps, significantly reducing the production cost of O3-MNBs.

[0004] CN214653899U discloses a ceramic membrane micro-nano aeration device. This technical solution increases the contact area between the gas and the sewage in the shell by setting the aeration nozzle into a cylindrical structure and opening multiple sets of air holes on the inner wall of the aeration nozzle, thereby improving the aeration effect of the ceramic membrane micro-nano aeration device.

[0005] Both CN116675325A and CN214653899U use ceramic membranes as the aeration unit for micro / nanobubbles. Their main principle is to control the particle size of the micro / nanobubbles by controlling the membrane pore size and aeration pressure. However, during the generation and detachment of bubbles from the ceramic membrane assembly, the presence of gas, liquid, and solid phases creates interfacial tension and energy between each pair of phases, inevitably leading to bubble adhesion to the ceramic membrane. When a large number of bubbles adhere to the ceramic membrane surface, they agglomerate, increasing their size and making it difficult to form a large number of micro / nanobubbles with a diameter less than 100 μm. Therefore, using static ceramic membrane aeration to prepare micro / nanobubbles is highly inefficient, significantly reducing the dissolved air effect. CN111888955A, on the other hand, uses a rotating ceramic membrane for aeration. During membrane rotation, microbubbles can detach from the ceramic membrane surface in a timely manner, preventing bubble agglomeration and increased particle size. However, this technical solution lacks detailed design of the ceramic diaphragm structure itself, while the core technology of rotating disc membrane aeration lies in the design of the gas flow channels within the diaphragm. Only a scientifically sound structural design can maximize aeration efficiency. In the gas flow channel structure design of ordinary ceramic diaphragms, the channel height is uniform. During high-speed rotation, due to centrifugal force, the pressure within the gas flow channels gradually increases from the central axis to the outer ring. This causes bubbles to rise first in the outer ring, but the inner ring does not yet reach the pressure required for transmembrane aeration. The aeration of the entire diaphragm is very uneven, resulting in only localized aeration in the outer ring, thus significantly reducing dissolved air efficiency. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of the prior art and provide an immersion-type rotating ceramic membrane aeration device.

[0007] The technical solution of the present invention is as follows:

[0008] An immersion-type rotating ceramic membrane aeration device includes a base, a waterproof rotating motor, a rotating ceramic membrane assembly, and a rotating joint.

[0009] A rotating ceramic membrane assembly includes a hollow shaft and several rotating ceramic membranes. The hollow shaft has an inner cavity along its length, with one end open and the other end closed. The hollow shaft also has several sets of air outlets evenly spaced along its length, each air outlet communicating with the inner cavity of the hollow shaft. Several rotating ceramic membranes are installed parallel and sealed on the hollow shaft. An intermediate seal is provided between adjacent rotating ceramic membranes, and end seals are provided at both ends of the rotating ceramic membranes. In each rotating ceramic membrane, the effective aeration area of ​​its internal air passage accounts for 50-70% of the total area of ​​the rotating ceramic membrane, including an inner ring air collection chamber, several air passages of the same size and structure, and an outer ring aeration chamber. The inner cavity of the hollow shaft, the several air outlets of the hollow shaft, the inner ring air collection chamber, the several air passages, and the outer ring aeration chamber are connected sequentially. The several air passages are distributed in a spiral shape with equal intervals in the rotating ceramic membrane.

[0010] A waterproof rotary motor drives the other end of the hollow shaft mentioned above.

[0011] The rotary joint has a rotatable air outlet and an air inlet connected to an external air source, and the air outlet is sealed at one end of the inner cavity of the hollow shaft.

[0012] The rotating ceramic membrane assembly, waterproof rotating motor, and rotating joint are all mounted on the base.

[0013] In a preferred embodiment of the present invention, in the plurality of airflow channels, the end of each airflow channel connected to the inner ring gas collecting chamber is smaller than the other end connected to the outer ring aeration chamber.

[0014] In a preferred embodiment of the invention, the transmembrane pressure in the internal air passage gradually increases from the hollow shaft to the edge of the rotating ceramic membrane.

[0015] More preferably, the overall thickness of the rotating ceramic membrane remains unchanged, and the height of the internal air passage gradually decreases from the hollow shaft to the edge of the rotating ceramic membrane.

[0016] More preferably, the height of the internal air passage gradually decreases from 30% to 60% of the overall thickness to 10% to 30%.

[0017] More preferably, the overall thickness of the rotating ceramic membrane gradually increases from the hollow shaft to the edge of the rotating ceramic membrane, while the overall height of the internal air passage remains unchanged.

[0018] More preferably, the overall thickness of the rotating ceramic membrane gradually increases from 1.5 to 3 times the height of the internal air passage to 2 to 5 times.

[0019] More preferably, the overall thickness of the rotating ceramic membrane remains unchanged, the overall height of the internal air passage remains unchanged, and the pore size of the rotating ceramic membrane gradually decreases from the hollow shaft to the edge of the rotating ceramic membrane.

[0020] In a preferred embodiment of the present invention, the hollow shaft has a square cross-section with chamfered apex. The intermediate seal has a central mounting hole adapted to the cross-section of the hollow shaft. The rotating ceramic diaphragm has a central through-hole, and the sidewall of the central through-hole has several air inlets communicating with the inner annular gas collection chamber. Two sealing rings are provided on the outer periphery of the central mounting hole corresponding to two adjacent rotating ceramic diaphragms. Several positioning posts are evenly spaced along the periphery of the central mounting hole between the sealing rings and the central mounting hole. The intermediate seal and the rotating ceramic diaphragm are both fitted onto the hollow shaft. The positioning posts position the central through-hole adapted to the rotating ceramic diaphragm to position the rotating ceramic diaphragm. The intermediate seal achieves end-face sealing with the two adjacent rotating ceramic diaphragms through the sealing rings. A gap of 10-50 μm exists between the periphery of the central mounting hole of the intermediate seal and the edge of the cross-section of the hollow shaft. This gap, the sealing rings, the intermediate seal, and the rotating ceramic diaphragm corresponding to the sealing ring form an air chamber. This air chamber communicates with the air outlet of the hollow shaft and the several air inlets on the sidewall of the central through-hole of the rotating ceramic diaphragm.

[0021] More preferably, the air inlet direction and the air outlet direction of the rotary joint are perpendicular to each other.

[0022] The beneficial effects of this invention are:

[0023] 1. The internal air passage of the rotating ceramic membrane in this invention includes an inner ring gas collecting chamber, several air flow channels of the same size and structure, and an outer ring aeration chamber. The inner ring gas collecting chamber is connected to the corresponding air outlet of the rotating ceramic membrane and is connected to the outer ring aeration chamber through several air flow channels. Different air flow channels distribute air independently. The inner ring gas collecting chamber performs secondary distribution of the incoming air to make the air distribution more uniform. The gas after secondary distribution is evenly aerated through the air flow channels. At the same time, the outer ring aeration chamber at the end of the air flow channels connects all the air flow channels, further ensuring the uniformity of aeration in each air flow channel.

[0024] 2. In this invention, the effective aeration area of ​​the internal air channels of the rotating ceramic membrane accounts for 50-70% of the total area of ​​the rotating ceramic membrane. Several air channels are distributed in a spiral shape at equal intervals in the rotating ceramic membrane. The end of each air channel connected to the inner ring gas collection chamber is smaller than the other end connected to the outer ring aeration chamber. This can maximize the effective area of ​​the gas flow channels, while ensuring that the supporting walls of the air channels distributed inside the rotating ceramic membrane have sufficient width to ensure the overall strength of the rotating ceramic membrane. On the one hand, this is beneficial to the flow and diffusion of gas during the rotation of the rotating ceramic membrane, reducing the resistance of the side walls of the air channels to the gas and saving more energy. On the other hand, it optimizes the effective aeration area and intensity of the rotating ceramic membrane to the greatest extent.

[0025] 3. In the internal air passage of the rotating ceramic membrane in this invention, the transmembrane pressure gradually increases from the hollow shaft to the edge of the rotating ceramic membrane. Due to the centrifugal force during rotation, the centrifugal force is greater closer to the outer edge of the rotating ceramic membrane, the pressure in the internal air passage is greater, and the gas is more likely to escape. Therefore, this design enables the rotating ceramic membrane to produce bubbles uniformly throughout.

[0026] 4. The invention can be submerged in water and is relatively flexible and easy to install, maintain and apply. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the immersion-type rotating ceramic membrane aeration device of the present invention.

[0028] Figure 2 This is a three-dimensional structural diagram of the intermediate sealing element in this invention.

[0029] Figure 3 This is a schematic diagram showing the interaction between the intermediate seal and the rotating ceramic membrane in this invention.

[0030] Figure 4 This is a schematic diagram of the internal air passage of the rotating ceramic membrane in this invention.

[0031] Figure 5 This is a cross-sectional view of the A-type rotating ceramic membrane of the present invention.

[0032] Figure 6 This is a cross-sectional view of the B-type rotating ceramic membrane of the present invention.

[0033] Figure 7 This is a cross-sectional view of the C-type rotating ceramic membrane of the present invention.

[0034] Figure 8 This is a three-dimensional structural diagram of the gap shaft in this invention.

[0035] Figure 9 This is a three-dimensional structural diagram of the rotary joint in this invention. Detailed Implementation

[0036] The technical solution of the present invention will be further explained and described below with reference to specific embodiments and accompanying drawings.

[0037] Example 1

[0038] like Figure 1 As shown, an immersion-type rotating ceramic membrane aeration device includes a base 1, a waterproof rotating motor 2, a rotating ceramic membrane assembly 3, and a rotating joint 4.

[0039] like Figure 1 and Figure 8 As shown, the rotating ceramic membrane assembly 3 includes a hollow shaft 31 and a plurality of rotating ceramic membranes 32. The hollow shaft 31 has an inner cavity 310 along its length direction, one end of which is open and the other end is closed. The hollow shaft 31 also has a plurality of air outlets 311 that are equally spaced along its length direction. Each air outlet 311 is connected to the inner cavity 310 of the hollow shaft 31. The plurality of rotating ceramic membranes 32 are installed in parallel and sealed on the hollow shaft 31.

[0040] The hollow shaft 31 has a square cross-section with chamfered apex; an intermediate seal 33 is provided between adjacent rotating ceramic membranes 32, and end seals 34 are provided at both ends of the rotating ceramic membranes 32; Figure 2 , Figure 3 and Figure 4 As shown, the intermediate seal 33 has a mounting center hole 330 adapted to the cross-section of the hollow shaft 31. The rotating ceramic diaphragm 32 has a central through hole 321, and the sidewall of the central through hole 321 has several air inlets 3210. Two sealing rings 331 are provided on the outer periphery of the mounting center hole 330 corresponding to two adjacent rotating ceramic diaphragms 32. Several positioning posts 332 are evenly spaced along the periphery of the mounting center hole 330 between the sealing rings 331 and the mounting center hole 330. The intermediate seal 33 and the rotating ceramic diaphragm 32 are both fitted onto the hollow shaft 31, and the positioning posts 332 are positioned to adapt to the rotating... The central through hole 321 of the ceramic membrane 32 is used to position the rotating ceramic membrane 32. The intermediate seal 33 achieves end face sealing with the two adjacent rotating ceramic membranes 32 through the sealing ring 331. The periphery of the mounting center hole 330 of the intermediate seal 33 has a gap of 10-50μm with the edge of the cross section of the hollow shaft 31. This gap, the sealing ring 331, the intermediate seal 33 and the rotating ceramic membrane 32 corresponding to the sealing ring 331 form an air chamber 333. The air chamber 333 connects the air outlet 311 of the hollow shaft 31 and several air inlets 3210 on the side wall of the central through hole 321 of the rotating ceramic membrane 32.

[0041] like Figure 4As shown, in each rotating ceramic membrane 32, the effective aeration area of ​​its internal air passage 320 accounts for 50-70% of the total area of ​​the rotating ceramic membrane 32. This includes an inner ring air collecting chamber 3201 connected to the aforementioned air inlets 3210, several airflow passages 3202 of the same size and structure, and an outer ring aeration chamber 3203. The inner ring air collecting chamber 3201 is connected to the corresponding air outlet 311 of its rotating ceramic membrane 32 and is connected to the outer ring aeration chamber 3203 through the airflow passages 3202. Different airflow passages 3202 distribute air independently. The inner ring air collecting chamber 3201 performs secondary distribution of the incoming air, making the air distribution more uniform. The secondary-distributed gas is evenly aerated through the airflow passages 3202. Simultaneously, the outer ring aeration chamber 3203 at the end of the airflow passages 3202 connects all the airflow passages 3202, further ensuring the uniformity of aeration within each airflow passage 3202.

[0042] Several airflow channels 3202 are distributed in a spiral pattern at equal intervals within the rotating ceramic membrane 32; the end of each airflow channel 3202 connected to the inner ring gas collection chamber 3201 is smaller than the other end connected to the outer ring aeration chamber 3203. This maximizes the effective area of ​​the gas flow channels while ensuring sufficient width of the supporting walls of the airflow channels 3202 within the rotating ceramic membrane 32 to guarantee the overall strength of the membrane. This facilitates gas flow and diffusion during rotation, reduces the resistance of the sidewalls of the airflow channels 3202 to the gas, and saves energy. Furthermore, it optimizes the effective aeration area and intensity of the rotating ceramic membrane 32 to the greatest extent possible.

[0043] In this embodiment, preferably, the width of the inner ring gas collecting chamber 3201 is 5-30mm, the number of airflow channels 3202 is 10-50, the width of the outer ring aeration chamber 3203 is 5-30mm, and the width of the airflow channel 3202 near the end of the outer ring aeration chamber 3203 is equal to the inner circumference length of the outer ring aeration chamber 3203 / the number of airflow channels 3202 - the sidewall thickness of the airflow channel 3202 near the end of the outer ring aeration chamber 3203. The width of the airflow channel 3202 near the end of the outer ring aeration chamber 3203 is 5-30mm, and its design requirement should not be too large, otherwise the rotating ceramic membrane 32 is prone to collapse during the sintering process and is also prone to explosion during operation.

[0044] Preferably, in the internal air passage 320, the transmembrane pressure gradually increases from the hollow shaft 31 to the edge of the rotating ceramic membrane 32. Due to the centrifugal force during rotation, the centrifugal force is greater closer to the outer edge of the rotating ceramic membrane 32, resulting in higher pressure within the internal air passage 320 and easier gas escape. Therefore, this design ensures uniform bubble formation throughout the rotating ceramic membrane 32. Specific selections are as follows:

[0045] Type A rotating ceramic membrane 32: such as Figure 5As shown, the overall thickness of the rotating ceramic membrane 32 remains constant (4-10 mm), and the height of the internal air passage 320 gradually decreases from the hollow shaft 31 to the edge of the rotating ceramic membrane 32. The height of the internal air passage 320 gradually decreases from 30% to 60% of the overall thickness to 10% to 30%.

[0046] Type B rotating ceramic membrane 32: such as Figure 6 As shown, the overall thickness of the rotating ceramic membrane 32 gradually increases from the hollow shaft 31 to the edge of the rotating ceramic membrane 32, while the overall height of the internal air passage 320 remains constant (1.2-6mm). The overall thickness of the rotating ceramic membrane 32 gradually increases from 1.5 to 3 times the height of the internal air passage 320 to 2 to 5 times.

[0047] C-type rotating ceramic membrane 32: such as Figure 7 As shown, the overall thickness of the rotating ceramic membrane 32 remains unchanged, the overall height of the internal air passage 320 remains unchanged, and the pore size of the membrane layer of the rotating ceramic membrane 32 gradually decreases from the hollow shaft 31 to the edge of the rotating ceramic membrane 32.

[0048] According to the mechanical formula:

[0049] P b =P g +P c -P tm

[0050] Where: P b Indicates aeration pressure,

[0051] P g This indicates the gas supply pressure, provided by an external gas supply system.

[0052] P c Centrifugal force refers to the force generated by the gas in the flow channel during the rotation of the diaphragm.

[0053] P tm It represents the transmembrane pressure, which is the resistance of the ceramic membrane layer to the gas.

[0054] When this invention is started and running, P g The constant value remains unchanged. When the rotating ceramic film 32 starts to rotate, as P... c The generation of P in different radially distributed regions on the surface of the rotating ceramic film 32 c The P value gradually increases from the inside out, but the P value of the above three types of rotating ceramic films 32 is... tm It gradually increases from the inside out, and P tm Increased distribution trend and P c The increasing distribution trend is consistent, therefore in P g Under the condition that it remains unchanged, P in different radial distribution regions of the rotating ceramic membrane 32b This ensures uniform bubble production and bubble size across the entire surface of the rotating ceramic membrane 32, ultimately achieving uniform aeration and significantly improved aeration efficiency. It boasts a large effective bubble production area, uniform bubble size control, and a large total amount of micro-nano bubbles—more than five times that of conventional membranes—resulting in a gas dissolution efficiency more than twice that of conventional membranes.

[0055] The waterproof rotary motor 2 drives the other end of the hollow shaft 31 mentioned above;

[0056] like Figure 9 As shown, the rotary joint 4 has an air outlet 41 and an air inlet 42 that connects to an external air source. The air outlet 41 seals one end of the inner cavity 310 of the hollow shaft 31. The air inlet direction and the air outlet direction of the rotary joint 4 are perpendicular to each other.

[0057] The rotating ceramic membrane 32-component 3, waterproof rotating motor 2, and rotating joint 4 are all mounted on the base 1, allowing the entire unit to be submerged in water for use. Installation, maintenance, and application are relatively flexible and simple. It has a wide range of applications, eliminating the need for dissolved air tanks, reflux pumps, release devices, etc., resulting in a streamlined structure, small footprint, more flexible application, and easier promotion. Its aeration pressure is low (1-2 bar), and its installed power is low, resulting in extremely low energy consumption compared to traditional dissolved air technologies. The bubble size can be adjusted and controlled through the regulation of operating parameters, meeting the needs of micro / nano bubbles for different application fields with varying bubble sizes.

[0058] Example 2

[0059] This embodiment uses the submerged rotating ceramic membrane 32 aeration device from Embodiment 1 for operation. The rotating ceramic membrane 32 is a type B rotating ceramic membrane 32. The external air source is air (the external air source can be O2, O3, air, H2, CO2, N2, etc.). The purpose of aeration is to increase dissolved oxygen and generate a higher concentration of micro-nano bubbles, thereby improving dissolved air efficiency.

[0060] The rotating ceramic membrane 32 is immersed in the water tank. The air inlet of the rotary joint 4 is connected to a compressed air supply pipe, and the air supply pressure is adjusted to 1-2.5 bar. The waterproof rotary motor 2 is turned on, and the speed is adjusted to 200-900 rpm. Compressed air enters the hollow shaft 31 through the rotary joint 4, and enters the internal air passages 320 of the rotating ceramic membrane 32 through the air outlet 311 of the hollow shaft 31. It is evenly distributed to all air passages 3202. When the air supply pressure exceeds the transmembrane pressure, the gas permeates through the ceramic membrane layer and is evenly released from the membrane surface into the liquid. After the waterproof rotary motor 2 is started, it drives the hollow shaft 31 to rotate, which in turn drives the rotating ceramic membrane 32 mounted on it to rotate. When the micro-nano bubbles on the surface of the rotating ceramic membrane 32 are well developed, they are quickly washed away by the fluid shear force on the surface of the rotating ceramic membrane 32, thus achieving the formation of micro-nano bubbles with higher density and more concentrated particle size range.

[0061] In laser particle size analyzers, the shading ratio refers to the degree to which particles block light in the laser beam path. The shading ratio can characterize sample concentration to a certain extent. In an ideal, uniformly dispersed sample system, and under specific particle size ranges and optical conditions, the shading ratio and sample concentration exhibit an approximately linear relationship. The table below compares the bubble particle size detection and DO (dissolved oxygen) improvement efficiency between traditional membranes and type B rotating ceramic membrane 32:

[0062]

[0063] Traditional membrane aeration primarily results in gas overflowing from the outer edge of the membrane, leading to relatively large bubble sizes. The total air supply is only 0.75 LPM, with a light-blocking ratio of only 1.7%. It takes 12 minutes to increase dissolved oxygen (DO) from 1 mg / L to 7.5 mg / L, resulting in low overall dissolved air efficiency. In contrast, the B-type rotating ceramic membrane 32 aeration method produces uniform bubbles across the membrane surface. At the same rotation speed, it requires only 0.45 LPM, and 5 minutes of aeration is sufficient to raise DO from 1 mg / L to 7.5 mg / L. The B-type rotating ceramic membrane 32 consumes only one-quarter the air of traditional membrane aeration, achieves a light-blocking ratio of 12%, produces a milky white water sample, and exhibits a significant increase in the amount of micro- and nano-bubbles.

[0064] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A submersible rotating ceramic membrane aeration device, characterized in that: It includes a base, a waterproof rotary motor, a rotary ceramic membrane assembly, and a rotary joint; A rotating ceramic membrane assembly includes a hollow shaft and a plurality of rotating ceramic membranes. The hollow shaft has an inner cavity along its length, one end of which is open and the other end is closed. The hollow shaft also has a plurality of air outlets evenly spaced along its length, each air outlet communicating with the inner cavity of the hollow shaft. The plurality of rotating ceramic membranes are mounted parallel and sealed on the hollow shaft. An intermediate seal is provided between adjacent rotating ceramic membranes, and end seals are provided at both ends of the rotating ceramic membranes. In each rotating ceramic membrane, the effective aeration area of ​​its internal air passages accounts for [percentage missing]. The rotating ceramic membrane comprises 50-70% of its total area, including an inner ring gas collection chamber, several airflow channels of the same size and structure, and an outer ring aeration chamber. The inner cavity of the hollow shaft, several air outlets of the hollow shaft, the inner ring gas collection chamber, several airflow channels, and the outer ring aeration chamber are sequentially connected. The several airflow channels are distributed in a spiral pattern with equal intervals in the rotating ceramic membrane. A rotary joint has a rotatable air outlet and an air inlet connected to an external air source. The air outlet is sealed and connected to one end of the inner cavity of the hollow shaft. A waterproof rotary motor drives the other end of the hollow shaft. The rotating ceramic membrane assembly, waterproof rotating motor, and rotating joint are all mounted on the base.

2. The submersible rotating ceramic membrane aeration device as described in claim 1, characterized in that: In the plurality of airflow channels, the end of each airflow channel connected to the inner ring gas collecting chamber is smaller than the other end connected to the outer ring aeration chamber.

3. The submersible rotating ceramic membrane aeration device as described in claim 1, characterized in that: In the internal air passage, the transmembrane pressure gradually increases from the hollow shaft to the edge of the rotating ceramic membrane.

4. The submersible rotating ceramic membrane aeration device as described in claim 3, characterized in that: The overall thickness of the rotating ceramic membrane remains constant, while the height of the internal air passage gradually decreases from the hollow shaft to the edge of the rotating ceramic membrane.

5. The submersible rotating ceramic membrane aeration device as described in claim 4, characterized in that: The height of the internal airway gradually decreases from 30% to 60% of the overall thickness to 10% to 30%.

6. The submersible rotating ceramic membrane aeration device as described in claim 3, characterized in that: The overall thickness of the rotating ceramic membrane gradually increases from the hollow shaft to the edge of the rotating ceramic membrane, while the overall height of the internal air passage remains unchanged.

7. The submersible rotating ceramic membrane aeration device as described in claim 6, characterized in that: The overall thickness of the rotating ceramic membrane gradually increases from 1.5 to 3 times the height of the internal airway to 2 to 5 times.

8. The submersible rotating ceramic membrane aeration device as described in claim 3, characterized in that: The overall thickness of the rotating ceramic membrane remains unchanged, the overall height of the internal air passage remains unchanged, and the pore size of the rotating ceramic membrane gradually decreases from the hollow shaft to the edge of the rotating ceramic membrane.

9. A submersible rotating ceramic membrane aeration device as described in any one of claims 1 to 8, characterized in that: The hollow shaft has a square cross-section with chamfered apex. The intermediate seal has a central mounting hole that fits the cross-section of the hollow shaft. The rotating ceramic diaphragm has a central through hole. The sidewall of the central through hole has several air inlets that connect to the inner ring gas collection chamber. Two sealing rings are provided on the outer periphery of the central mounting hole corresponding to two adjacent rotating ceramic diaphragms. Several positioning posts are evenly spaced along the periphery of the central mounting hole between the sealing rings and the central mounting hole. The intermediate seal and the rotating ceramic diaphragm are both fitted onto the hollow shaft. The positioning posts position the central through hole that fits the rotating ceramic diaphragm to position the rotating ceramic diaphragm. The intermediate seal achieves end-face sealing with the two adjacent rotating ceramic diaphragms through the sealing rings. The periphery of the central mounting hole of the intermediate seal has a gap of 10-50 μm with the edge of the cross-section of the hollow shaft. This gap, the sealing rings, the intermediate seal, and the rotating ceramic diaphragm corresponding to the sealing ring form an air chamber. This air chamber connects the air outlet of the hollow shaft and several air inlets on the sidewall of the central through hole of the rotating ceramic diaphragm.

10. The submersible rotating ceramic membrane aeration device as described in claim 9, characterized in that: The air inlet direction and air outlet direction of the rotary joint are perpendicular to each other.

Images