Immersed rotary ceramic membrane aeration device

Abstract

The utility model discloses an immersed rotary ceramic membrane aeration device which comprises a base, a waterproof rotary motor, a rotary ceramic membrane component and a rotary joint, an internal air channel of the rotary ceramic membrane comprises an inner ring air collection cavity, a plurality of air flow channels with the same size and structure and an outer ring aeration cavity, the inner ring air collection cavity is communicated with air outlet holes corresponding to the rotary ceramic membrane where the inner ring air collection cavity is located and is communicated with the outer ring aeration cavity through the air flow channels, and different air flow channels distribute air independently. The inner ring gas collection cavity carries out secondary distribution on inlet gas, so that gas distribution is more uniform, the gas subjected to secondary distribution passes through the gas flow channels to be uniformly aerated, and meanwhile, the outer ring aeration cavity at the tail ends of the gas flow channels communicates all the gas flow channels, so that the aeration uniformity in each gas flow channel is further ensured. The whole device can be submerged into water for use, and is relatively flexible, simple and convenient to install, maintain and apply.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of rotary ceramic membrane application, specifically relates to the submerged rotary ceramic membrane aeration device. BACKGROUND

[0002] CN111888955A discloses a kind of micro-nano bubble generating device, air floatation device and liquid processing method.The technical scheme includes frame, micro-nano bubble generating component, driving mechanism, gas compressor and gas pipe.Micro-nano bubble generating component includes hollow shaft with cavity, several sets of micro-porous ceramic diaphragm and support arranged in the hollow shaft.The micro-nano bubble generating device of this technical scheme is based on rotary membrane technology research and development, and the micro-porous ceramic diaphragm used directly induces nanometer bubble generation, without dissolving gas in water, the bubble diameter produced is small, and bubble size uniformity is high.

[0003] CN116675325A discloses a kind of ceramic membrane aeration device, suitable for micro-nano aeration ozone contact tank and aeration method.The technical scheme can produce micro-nano bubble, compared with millimeter level bubble produced by micro-porous aeration, O3-MNB (ozone micro-nano bubble) in water long residence time, large specific surface area, mass transfer efficiency, can produce more active oxygen substance (ROS), so as to strengthen the oxidation degradation efficiency of ozone to various pollutants.In addition, the aeration method described in the technical scheme combines ozone pressure, water flow rate, ceramic membrane aperture, can produce O3-MNBs with average particle size less than 50 μm, improve the mass transfer efficiency of ozone in water, strengthen free radical generation while avoid the use of high energy consumption equipment such as dissolved air pump, can significantly reduce the production cost of O3-MNBs.

[0004] CN214653899U discloses a kind of ceramic membrane micro-nano aeration device, the technical scheme is by being set into cylindrical structure and being provided with multiple groups of air holes in the inner wall of aeration nozzle, so as to increase the contact area of gas and sewage in shell, improve the aeration effect of ceramic membrane micro-nano aeration device.

[0005] CN116675325A and CN214653899U both use ceramic membranes as aeration generating units of micro-nano bubbles, and the main principle is to control the particle size of micro-nano bubbles by controlling the size of the membrane pore size and the aeration pressure. However, in the process of bubble generation and separation from the ceramic membrane assembly, under the coexistence of gas, liquid and solid three-phase media, there is interface tension and interface energy on the interface between each two phases, which inevitably leads to the adhesion of bubbles and ceramic membranes. When a large number of bubbles adhere to the surface of the ceramic membrane, the bubbles will adhere and agglomerate between the bubbles, making the bubble particle size larger, and it is difficult to form a large number of micro-nano bubbles with a particle size of less than 100 μm. Therefore, the efficiency of using static ceramic membrane aeration to prepare micro-nano bubbles is very low, and the gas dissolution effect will be greatly discounted. CN111888955A uses a rotating ceramic membrane for aeration, and the micro-bubbles can be separated from the surface of the ceramic membrane in time during the rotation of the membrane, avoiding bubble agglomeration and particle size increase. However, this technical solution does not have more detailed design for the structure of the ceramic membrane itself, and the core technology of the rotating disc membrane aeration is the design of the membrane gas flow channel. Scientific and reasonable structure design can maximize the aeration efficiency. In the design of the gas flow channel structure inside the ordinary ceramic membrane, the flow channel height is uniform. Due to the influence of centrifugal force during high-speed rotation of this membrane, the pressure in the membrane gas flow channel will gradually increase from the center axis to the outer ring in stages, causing the outer ring of the membrane to bubble first, but the inner ring cannot reach the transmembrane aeration pressure. The aeration of the whole membrane is very uneven, and only the outer ring of the membrane is locally aerated, so the gas dissolution efficiency is greatly discounted. Practical new type content

[0006] The utility model aims at overcoming prior art defects, provides immersed rotating ceramic membrane aeration device.

[0007] The technical scheme of the utility model is as follows:

[0008] The immersed rotating ceramic membrane aeration device comprises a base, a waterproof rotating motor, a rotating ceramic membrane assembly and a rotating joint.

[0009] The utility model discloses a rotary ceramic membrane assembly, including a hollow shaft and a plurality of rotary ceramic membranes, the hollow shaft has the inner chamber along its length direction, the inner chamber one end is open, the other end is closed, and the hollow shaft has along its length direction equal interval and is arranged a plurality of gas outlet, and each gas outlet all communicates the inner chamber of hollow shaft, a plurality of rotary ceramic membranes are parallel and are sealed and are arranged on the hollow shaft, and are equipped with intermediate sealing between adjacent rotary ceramic membranes, and the rotary ceramic membrane at both ends is equipped with end sealing, and in each rotary ceramic membrane, the effective aeration area of internal air passage accounts for 50-70% of the total area of rotary ceramic membrane, including a ring gas collection cavity, a plurality of airflow passages with same size structure and a ring aeration cavity, the inner chamber of hollow shaft, the gas outlet of hollow shaft, ring gas collection cavity, a plurality of airflow passages and ring aeration cavity are communicated in proper order, and a plurality of airflow passages are in the equal interval helical distribution in rotary ceramic membrane.

[0010] Waterproof rotary motor, drive connection the other end of the hollow shaft.

[0011] Rotary joint, with a rotatable gas outlet and a gas inlet communicating external air source, and the gas outlet is sealed and communicated with the inner chamber of the hollow shaft one end.

[0012] Rotary ceramic membrane assembly, waterproof rotary motor and rotary joint are all installed on the base.

[0013] In an preferred embodiment of the utility model, in a plurality of airflow passages, one end of each airflow passage connected with ring gas collection cavity is less than the other end connected with ring aeration cavity.

[0014] In an preferred embodiment of the utility model, the overall thickness of the rotary ceramic membrane is constant, and the height of the internal air passage gradually decreases from the hollow shaft to the edge of the rotary ceramic membrane.

[0015] Further preferably, the height of the internal air passage gradually decreases from 30% to 60% to 10% to 30% of the overall thickness.

[0016] In an preferred embodiment of the utility model, the overall thickness of the rotary ceramic membrane gradually increases from the hollow shaft to the edge of the rotary ceramic membrane, and the overall height of the internal air passage is constant.

[0017] Further preferably, the overall thickness of the rotary ceramic membrane gradually increases from 1.5 to 3 times to 2 to 5 times of the height of the internal air passage.

[0018] In an preferred embodiment of the utility model, the overall thickness of the rotary ceramic membrane is constant, the overall height of the internal air passage is constant, and the pore size of the membrane layer of the rotary ceramic membrane gradually decreases from the hollow shaft to the edge of the rotary ceramic membrane.

[0019] In an optimal embodiment of the utility model, the cross section of the hollow shaft is a square with chamfered corners, the intermediate sealing piece has a mounting center hole matching the cross section of the hollow shaft, the rotating ceramic membrane has a central through hole, the side wall of the central through hole has a plurality of gas inlet holes communicating with the inner ring gas collecting cavity, the outer periphery of the mounting center hole is provided with two sealing rings corresponding to two adjacent rotating ceramic membranes, a plurality of positioning columns are arranged along the periphery of the mounting center hole at equal intervals between the sealing ring and the mounting center hole, the intermediate sealing piece and the rotating ceramic membrane are sleeved on the hollow shaft, the central through hole of the rotating ceramic membrane is positioned and matched by the plurality of positioning columns to position the rotating ceramic membrane, the intermediate sealing piece realizes end face sealing with the two adjacent rotating ceramic membranes through the sealing ring, the periphery of the mounting center hole of the intermediate sealing piece and the edge of the cross section of the hollow shaft have a gap of 10-50 microns, the gap, the sealing ring, the intermediate sealing piece and the rotating ceramic membrane corresponding to the sealing ring form an air chamber, and the air chamber communicates with the gas outlet hole of the hollow shaft and the plurality of gas inlet holes of the side wall of the central through hole of the rotating ceramic membrane.

[0020] Further preferably, the gas inlet direction and the gas outlet direction of the rotary joint are perpendicular to each other.

[0021] The utility model has the advantages of:

[0022] 1. The internal air duct of the rotating ceramic membrane comprises an inner ring gas collecting cavity, a plurality of gas flow channels with the same size and an outer ring aeration cavity. The inner ring gas collecting cavity communicates with the corresponding gas outlet hole of the rotating ceramic membrane and communicates with the outer ring aeration cavity through the plurality of gas flow channels. The different gas flow channels are independently aerated. The inner ring gas collecting cavity distributes the gas twice to make the gas distribution more uniform. The twice distributed gas is uniformly aerated through the gas flow channel. The outer ring aeration cavity at the end of the gas flow channel connects all the gas flow channels to further ensure the uniformity of the aeration in the gas flow channels.

[0023] 2. The effective aeration area of the internal air duct of the rotating ceramic membrane accounts for 50-70% of the total area of the rotating ceramic membrane. The plurality of gas flow channels are distributed in the rotating ceramic membrane in an equidistant spiral manner. One end of each gas flow channel connected to the inner ring gas collecting cavity is smaller than the other end connected to the outer ring aeration cavity, which can maximize the effective area of the gas flow channel and maintain the width of the support wall of the distributed gas flow channel in the rotating ceramic membrane to ensure the overall strength of the rotating ceramic membrane. On the one hand, it is beneficial to the flow and diffusion of the gas in the rotating process of the rotating ceramic membrane, reduces the resistance of the side wall of the gas flow channel to the gas, and saves energy consumption. On the other hand, it optimizes the effective aeration area and strength of the rotating ceramic membrane to the maximum extent.

[0024] 3. In the internal air passage of the rotating ceramic membrane in this utility model, 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 can make the rotating ceramic membrane bubble evenly throughout.

[0025] 4. This utility model can be submerged in water for use, and its installation, maintenance and application are relatively flexible and simple. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the immersion-type rotating ceramic membrane aeration device of this utility model.

[0027] Figure 2 This is a three-dimensional structural diagram of the intermediate sealing element in this utility model.

[0028] Figure 3 This is a schematic diagram showing the cooperation between the intermediate sealing element and the rotating ceramic membrane in this utility model.

[0029] Figure 4 This is a schematic diagram of the internal air passage of the rotating ceramic membrane in this utility model.

[0030] Figure 5 This is a cross-sectional view of the A-type rotating ceramic membrane of this utility model.

[0031] Figure 6 This is a cross-sectional view of the B-type rotating ceramic membrane of this utility model.

[0032] Figure 7 This is a cross-sectional view of the C-shaped rotating ceramic membrane of this utility model.

[0033] Figure 8 This is a three-dimensional structural diagram of the gap shaft in this utility model.

[0034] Figure 9 This is a three-dimensional structural diagram of the rotary joint in this utility model. Detailed Implementation

[0035] The technical solution of this utility model will be further explained and described below with reference to specific embodiments and accompanying drawings.

[0036] Example 1

[0037] like Figure 1 As shown, the submersible 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.

[0038] likeFigure 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.

[0039] 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.

[0040] like Figure 4As shown, in each rotating ceramic membrane 32, the effective aeration area of the internal air channel 320 accounts for 50-70% of the total area of the rotating ceramic membrane 32, and includes an inner ring air collection cavity 3201 connected to the above-mentioned air inlet hole 3210, a plurality of air flow channels 3202 with the same size structure, and an outer ring aeration cavity 3203. The inner ring air collection cavity 3201 is connected to the above-mentioned air outlet hole 311 corresponding to the rotating ceramic membrane 32, and is connected to the outer ring aeration cavity 3203 through the air flow channels 3202. The different air flow channels 3202 are independently aerated, the inner ring air collection cavity 3201 performs secondary distribution of the air inlet, so that the air distribution is more uniform, and the air after the secondary distribution is uniformly aerated through the air flow channels 3202. At the same time, the outer ring aeration cavity 3203 at the end of the air flow channel 3202 connects all the air flow channels 3202, further ensuring the uniformity of aeration in each air flow channel 3202.

[0041] The plurality of air flow channels 3202 are distributed in the rotating ceramic membrane 32 in an equidistant spiral shape. One end of each air flow channel 3202 connected to the inner ring air collection cavity 3201 is smaller than the other end connected to the outer ring aeration cavity 3203. In this way, the effective area of the flow channel can be maximized, while the support wall of the air flow channel 3202 distributed in the rotating ceramic membrane 32 has sufficient width to ensure the overall strength of the rotating ceramic membrane 32. On the one hand, it is beneficial to the flow and diffusion of gas in the rotating ceramic membrane 32 during rotation, reduces the resistance of the side wall of the air flow channel 3202 to the gas, and saves energy consumption. On the other hand, the effective aeration area and strength of the rotating ceramic membrane 32 are optimized to the maximum extent.

[0042] In this embodiment, preferably, the width of the inner ring air collection cavity 3201 is 5-30 mm, the number of air flow channels 3202 is 10-50, the width of the outer ring aeration cavity 3203 is 5-30 mm, the width of the air flow channel 3202 close to the outer ring aeration cavity 3203 is equal to the outer circumference length of the outer ring aeration cavity 3203 / the number of air flow channels 3202-the side wall thickness of the air flow channel 3202 close to the outer ring aeration cavity 3203, and the width of the air flow channel 3202 close to the outer ring aeration cavity 3203 is 5-30 mm. The design requirement should not be too large, otherwise the rotating ceramic membrane 32 is easy to collapse during sintering and easy to burst during operation.

[0043] Preferably, in the internal air channel 320, the transmembrane pressure gradually increases from the hollow shaft 31 to the edge of the rotating ceramic membrane 32. Due to the action of centrifugal force during rotation, the closer to the outer edge of the rotating ceramic membrane 32, the greater the centrifugal force, and the greater the pressure in the internal air channel 320, so the gas is more likely to escape. Therefore, this design can make the rotating ceramic membrane 32 uniformly bubble. The specific selection is as follows:

[0044] A-type rotating ceramic membrane 32: 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%.

[0045] 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.

[0046] 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.

[0047] According to the mechanical formula:

[0048] P b =P g +P c -P tm

[0049] Where: P b Indicates aeration pressure,

[0050] P g This indicates the gas supply pressure, provided by an external gas supply system.

[0051] P c Centrifugal force refers to the force generated by the gas in the flow channel during the rotation of the diaphragm.

[0052] P tm It represents the transmembrane pressure, which is the resistance of the ceramic membrane layer to the gas.

[0053] When this utility model starts up and runs, 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 Invariable, thus ensuring the overall film surface of the rotating ceramic membrane 32 uniform bubble, bubble size uniform, ultimately achieve uniform aeration, aeration efficiency significantly improved. Its effective bubble area is large, bubble size control uniform, the total amount of micro-nano bubbles produced is more than 5 times the number of conventional membrane, and the gas dissolution efficiency is also more than 1 times higher than conventional membrane.

[0054] The waterproof rotating motor 2 drives and connects the other end of the hollow shaft 31.

[0055] As shown in Figure 9 The rotating joint 4 has an air outlet 41 and an air inlet 42 connected to an external gas source, and the air outlet 41 is sealed and communicated with one end of the inner cavity 310 of the hollow shaft 31; the air inlet direction of the rotating joint 4 is perpendicular to the air outlet direction.

[0056] The rotating ceramic membrane 32 assembly 3, the waterproof rotating motor 2 and the rotating joint 4 are all installed on the base 1, and the whole can be immersed in water for use, and the installation, maintenance and application are relatively flexible and simple. Its application field is wide, without the need to configure a gas tank, a reflux pump, a releaser and the like, the structure is simple, the land occupation is small, the equipment application is more flexible, and it is easier to promote. Its aeration pressure is low (1-2 bar), the installed power is low, and the energy consumption is extremely low compared with the traditional gas dissolution technology. Its bubble size can be adjusted and controlled by adjusting the operating parameters, and the size of the bubble can be adjusted and controlled, which can meet the needs of different particle sizes of micro-nano bubbles in different fields.

[0057] Example 2

[0058] This embodiment uses the submerged rotating ceramic membrane 32 aeration device of example 1 to work, wherein the structure of the rotating ceramic membrane 32 is B-type rotating ceramic membrane 32, the external gas source is air (the external gas source can be O2, O3, air, H2, CO2, N2 and the like), and the purpose of aeration is to improve the dissolved oxygen and produce higher concentration of micro-nano bubbles and improve the gas dissolution efficiency.

[0059] The rotating ceramic membrane 32 is put into the water tank as a whole, the air inlet of the rotating joint 4 is connected with the compressed air supply pipe, the air supply pressure is adjusted to 1-2.5 bar, the power supply of the waterproof rotating motor 2 is turned on, and the rotating speed is adjusted to 200-900 rpm. The compressed air enters the hollow shaft 31 through the rotating joint 4, enters the internal air duct 320 of the rotating ceramic membrane 32 sheet from the air outlet hole 311 of the hollow shaft 31, and is uniformly dispersed to all air flow channels 3202. When the air supply pressure exceeds the transmembrane pressure, the gas uniformly releases from the membrane surface into the liquid through the ceramic membrane layer. The waterproof rotating motor 2 drives the hollow shaft 31 to rotate, and the hollow shaft 31 in turn drives the rotating ceramic membrane 32 sheet installed thereon to rotate. When the micro-nano bubbles on the surface of the rotating ceramic membrane 32 sheet develop well, they are quickly washed away by the fluid shear force on the surface of the rotating ceramic membrane 32 sheet. Therefore, micro-nano bubbles with higher density and more concentrated particle size range can be formed.

[0060] In the laser particle size analyzer, the light shielding ratio refers to the degree of shielding light by particles in the laser light path. The light shielding ratio can represent the sample concentration to a certain extent. In an ideal, uniformly dispersed sample system, and under certain particle size range and optical conditions, the light shielding ratio and the sample concentration are approximately linearly related. The following table is a comparison of the bubble particle size detection and DO enhancement efficiency of the traditional membrane and the B-type rotating ceramic membrane 32:

[0061]

[0062] In the traditional membrane aeration, the gas mainly overflows from the outer edge of the membrane, the bubble particle size is large, the total air supply is 0.75 LPM, the light shielding ratio is only 1.7%, and the aeration time required for the dissolved oxygen to increase from 1 mg / L to 7.5 mg / L is 12 min. The overall gas dissolution efficiency is low. In the B-type rotating ceramic membrane 32 aeration, the bubbles are uniformly discharged from the membrane surface. Under the same rotating speed, the air supply only needs 0.45 LPM, and the DO can reach 7.5 mg / L from 1 mg / L in 5 min. The air consumption of the B-type rotating ceramic membrane 32 is only 1 / 4 of that of the traditional membrane aeration. The light shielding ratio detected can reach 12%, the water sample is milky white, and the amount of micro-nano bubbles is significantly increased.

[0063] The above is only a preferred embodiment of the present application, and therefore cannot limit the scope of the present application. Any equivalent changes and modifications made in accordance with the scope and content of the present application should still be within the scope of the present application.

Claims

1. A submerged rotary ceramic membrane aeration device, characterized by: The application relates to a rotating ceramic membrane assembly, which comprises a base, a waterproof rotating motor, a rotating ceramic membrane assembly and a rotating joint. The rotating ceramic membrane assembly comprises a hollow shaft and a plurality of rotating ceramic membranes; the hollow shaft has an inner cavity along the length direction of the hollow shaft, the inner cavity is open at one end and closed at the other end, and the hollow shaft is provided with a plurality of air outlet holes which are equidistantly arranged along the length direction of the hollow shaft and are in communication with the inner cavity; the plurality of rotating ceramic membranes are arranged in parallel and sealed on the hollow shaft; intermediate sealing members are arranged between adjacent rotating ceramic membranes, and end sealing members are arranged on the rotating ceramic membranes at both ends; the effective aeration area of the internal air passage of each rotating ceramic membrane accounts for 50-70% of the total area of the rotating ceramic membrane; the rotating ceramic membrane comprises an inner ring air collecting cavity, a plurality of air flow channels with the same size and an outer ring aeration cavity; the inner cavity of the hollow shaft, the air outlet holes of the hollow shaft, the inner ring air collecting cavity, the plurality of air flow channels and the outer ring aeration cavity are sequentially in communication; the plurality of air flow channels are equidistantly and spirally distributed in the rotating ceramic membrane. The waterproof rotating motor is connected to the other end of the hollow shaft. The rotating joint has a rotatable air outlet and an air inlet in communication with an external air source; the air outlet is in sealed communication with one end of the inner cavity of the hollow shaft. The rotating ceramic membrane assembly, the waterproof rotating motor and the rotating joint are all arranged on the base.

2. The submerged rotary ceramic membrane aeration device of claim 1, wherein: In the plurality of air flow channels, one end of each air flow channel connected to the inner ring air collecting cavity is smaller than the other end connected to the outer ring aeration cavity.

3. The submerged rotary ceramic membrane aeration device of claim 1, wherein: The overall thickness of the rotating ceramic membrane is constant, and the height of the internal air passage gradually decreases from the hollow shaft to the edge of the rotating ceramic membrane.

4. The submerged rotary ceramic membrane aeration device of claim 3, wherein: The height of the internal air passage gradually decreases from 30% to 60% to 10% to 30% of the overall thickness.

5. The submerged rotating ceramic membrane aeration device of claim 1, wherein: The overall thickness of the rotating ceramic membrane gradually increases from the hollow shaft to the edge of the rotating ceramic membrane, and the overall height of the internal air passage is constant.

6. The submerged rotary ceramic membrane aeration device of claim 5, wherein: The overall thickness of the rotating ceramic membrane gradually increases from 1.5 to 3 times to 2 to 5 times of the height of the internal air passage.

7. The submerged rotating ceramic membrane aeration device of claim 1, wherein: The overall thickness of the rotating ceramic membrane is constant, the overall height of the internal air passage is constant, and the pore size of the membrane layer of the rotating ceramic membrane gradually decreases from the hollow shaft to the edge of the rotating ceramic membrane.

8. The submerged rotary ceramic membrane aeration device according to any one of claims 1 to 7, characterized in that: The cross section of the hollow shaft is a square with chamfered corners, the intermediate sealing element has a mounting center hole matching the cross section of the hollow shaft, the rotating ceramic membrane has a central through hole, the side wall of the central through hole has a plurality of gas inlet holes communicating with the inner ring gas collection cavity, the outer periphery of the mounting center hole is provided with two sealing rings corresponding to two adjacent rotating ceramic membranes, the sealing ring and the mounting center hole have a plurality of positioning columns arranged at equal intervals along the periphery of the mounting center hole, the intermediate sealing element and the rotating ceramic membrane are sleeved on the hollow shaft, the plurality of positioning columns are matched with the central through hole of the rotating ceramic membrane to position the rotating ceramic membrane, the intermediate sealing element realizes end face sealing with the adjacent two rotating ceramic membranes through the sealing ring, the periphery of the mounting center hole of the intermediate sealing element and the edge of the cross section of the hollow shaft have a gap of 10-50 μm, the gap, the sealing ring, the intermediate sealing element and the rotating ceramic membrane corresponding to the sealing ring form an air chamber, and the air chamber communicates with the gas outlet hole of the hollow shaft and the plurality of gas inlet holes of the side wall of the central through hole of the rotating ceramic membrane.

9. The submerged rotary ceramic membrane aeration device of claim 8, wherein: The gas inlet direction and the gas outlet direction of the rotating joint are perpendicular to each other.

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