A self-cleaning ceramic membrane filtration device and method based on vibration and rotation coupling

Abstract

A kind of self-cleaning ceramic membrane filtration device and method based on vibration, rotation coupling, device includes a set of double dynamic cleaning mechanism consisting of hollow coupling shaft, flexible cleaning arm and drive unit, coupling axial high-frequency vibration and coaxial low-speed rotation movement in single executor, drive cleaning arm to membrane surface is applied to continuous rotation scraping and high-frequency micro-vibration in filtering process.Vibration effect can produce high shear micro-turbulence in membrane-liquid interface and reduce the adhesion of pollutants, rotation ensures that cleaning has no dead angle, both realize the active, sustained physical intervention to pollution layer, fundamentally inhibit the formation of gel layer and membrane hole blockage.The present application breaks through the limitation of traditional intermittent cleaning, can greatly extend the filtering period, improve production continuity, and reduce cleaning cost, has wide application prospect in liquid-solid separation in the field of biological fermentation, food and medicine.

Description

Technical Field

[0001] This invention relates to a ceramic membrane filtration device, and more particularly to a self-cleaning ceramic membrane filtration device and method based on vibration and rotation coupling. Background Technology

[0002] Due to the complex composition of bacterial solutions (containing bacteria, extracellular polymers, proteins, etc.), ceramic membrane filtration devices are prone to forming a dense gel layer on the surface of the ceramic membrane during filtration, which can deeply clog the membrane pores. Traditional backflush and chemical cleaning (CIP) are intermittent, reactive operations that cannot prevent the clogging process, and they also affect continuous production, increase costs, and create environmental pressure.

[0003] In addition, existing mechanical cleaning solutions generally rely on simple vibration or rotational scraping. The former is insufficient for removing firmly adhered gel layers, while the latter is prone to creating scraping "dead zones" and localized concentration polarization when stationary. Summary of the Invention

[0004] Purpose of the invention: To address the above-mentioned problems, the purpose of this invention is to provide a self-cleaning ceramic membrane filtration device and method based on vibration and rotation coupling, which enables more comprehensive and thorough cleaning of the ceramic membrane.

[0005] Technical Solution: A self-cleaning ceramic membrane filtration device based on vibration and rotation coupling includes a filter device body. A ceramic membrane assembly is installed inside the housing of the filter device body. A cleaning arm is inserted into each of the multiple filter holes of the ceramic membrane assembly. A coupling shaft is coaxially connected to one end of each cleaning arm. A sliding connecting plate and a vibration connecting plate are spaced apart inside the housing along the axial direction. The coupling shafts are respectively inserted through the sliding connecting plate. A rotation drive mechanism is installed at the bottom of the vibration connecting plate. One coupling shaft is connected to the rotation drive mechanism and is connected to both the rotating drive mechanism and the coupling shaft. The remaining coupling shafts are rotatably connected to the vibration connecting plate. The outer peripheral surface of the sliding connecting plate slides against the inner peripheral surface of the housing. A vibration generating unit is installed inside the housing and connected to the top surface of the vibration connecting plate. A scraper is installed on each cleaning arm, and the scraper abuts against the inner peripheral wall of the filter hole.

[0006] Simultaneous filtration and cleaning are initiated simultaneously: During operation, the bacterial solution undergoes cross-flow filtration under pressure, while the coupling shaft drives the cleaning arm to rotate at low speed, superimposed with high-frequency axial vibration. The continuous rotation of the cleaning arm creates a continuous, circumferential mechanical scraping of the membrane surface, physically stripping away the forming filter cake layer. The axial vibration is transmitted through the cleaning arm to the membrane surface and surrounding fluid, producing two effects: Localized high shear: Intense microturbulence and transient high shear force are generated at the membrane-liquid interface, disrupting the concentration boundary layer and preventing particulate matter deposition. Vibration lubrication effect: The adhesion between contaminants and the membrane surface is significantly reduced, making them easier to be carried away by the rotating scraper.

[0007] Vibration changes the scraping action from "bulldozing" to "vibration sweeping," doubling the cleaning efficiency; rotation ensures that the vibration energy is evenly distributed 360 degrees on the membrane surface, leaving no dead angles.

[0008] Furthermore, the coupling shaft connected to the rotary drive mechanism is the driving shaft, and the other coupling shafts are driven shafts, arranged sequentially at intervals along the circumference of the driving shaft with the driving shaft as the center.

[0009] Ideally, each coupling shaft has a gear mounted on its outer circumference, and the driven shaft is connected to the driving shaft through gear meshing.

[0010] Ideally, the driven shaft and the vibration connecting plate are connected by bearings.

[0011] Furthermore, at least one long T-shaped groove is formed along its axial direction on the outer peripheral surface of the cleaning arm, and the scraper is disposed in the T-shaped groove and connected to the inside of the T-shaped groove by multiple springs.

[0012] Furthermore, the vibration generating unit is located near the feed inlet of the filter body.

[0013] Ideally, the rotary drive mechanism should be a servo motor or a geared motor.

[0014] Ideally, the vibration generating unit is an electromagnetic vibrator or an eccentric vibration motor.

[0015] A method for operating the above-mentioned self-cleaning ceramic membrane filter device based on vibration and rotational coupling includes the following steps:

[0016] Step 1: The filter unit starts up and performs basic filtration cycle operations. At the same time, the rotary drive mechanism starts up, and its output shaft drives one of the coupling shafts to rotate, which in turn drives the other coupling shafts to rotate together.

[0017] Step 2: Each coupling shaft rotates at the same low speed, driving the cleaning arm to rotate. At the same time, the vibration generating unit is activated, driving the coupling shaft connected to it to perform axial high-frequency vibration through the vibration connecting plate.

[0018] Step 3: The scraper on the cleaning arm cleans the ceramic membrane module, while axial vibration is transmitted to the membrane surface and the surrounding fluid through the cleaning arm, which reduces the adhesion between the pollutants and the membrane surface, making it easier for the scraper to clean.

[0019] Beneficial effects: Compared with the prior art, the advantages of the present invention are:

[0020] 1. For the first time, high-frequency axial vibration and coaxial continuous rotation are organically integrated into a single actuator through a coupling shaft and a dynamic cleaning arm, resulting in a compact structure.

[0021] 2. The mechanism is synergistic: vibration reduces scraping resistance and improves shearing efficiency; rotation expands the effective area of ​​vibration. The anti-clogging effect produced by the synergy of the two far exceeds that of either single mechanism (1+1>2).

[0022] 3. It features online real-time operation, with cleaning actions and filtration processes being completely synchronized and continuous, achieving a fundamental shift from "periodic recovery" to "continuous maintenance," and revolutionarily extending the filtration cycle.

[0023] 4. It features self-adaptive and protective design. The flexible cleaning arm and adaptive tensioning mechanism ensure cleaning effectiveness while avoiding hard wear on the expensive ceramic film surface caused by rigid scrapers, thus improving the reliability and lifespan of the device.

[0024] The vibration-rotation coupling online self-cleaning ceramic membrane filtration device, through its original mechanical structure design, actively and in real time intervenes in the membrane fouling process at the physical level, fundamentally solving the problem of clogging of bacterial liquid in ceramic membrane filtration. Attached Figure Description

[0025] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0026] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0027] Figure 3 for Figure 1 A three-dimensional structural diagram with the sliding connecting plate removed;

[0028] Figure 4 Schematic diagram of the connection structure between the cleaning arm and the coupling shaft Figure 1 ;

[0029] Figure 5 Schematic diagram of the connection structure between the cleaning arm and the coupling shaft Figure 2 ;

[0030] Figure 6 for Figure 6 Enlarged view A;

[0031] Figure 7 This is a schematic diagram of the connection structure between the scraper and the cleaning arm. Detailed Implementation

[0032] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0033] A self-cleaning ceramic membrane filtration device based on vibration and rotation coupling, such as Figures 1-7As shown, the device includes a filter body. A ceramic membrane assembly 2 is installed inside the housing 1 of the filter body. A cleaning arm 12 is inserted into each of the multiple filter holes of the ceramic membrane assembly 2. One end of each cleaning arm 12 is coaxially connected to a coupling shaft 10. A sliding connecting plate 8 and a vibrating connecting plate 9 are spaced apart inside the housing 1 along its axial direction. The coupling shafts 10 are respectively inserted into the sliding connecting plate 8 and can slide relative to each other through the sliding connecting plate 8. A rotary drive mechanism 3 is installed at the bottom of the vibrating connecting plate 9. The rotary drive mechanism 3 is a servo motor or a geared motor. One coupling shaft 10 is connected to the rotary drive mechanism 3 and is connected to both the rotary drive mechanism 3 and the coupling shaft 10. The remaining coupling shafts 10 are rotatably connected to the vibrating connecting plate 9 through bearings. The coupling shaft 10 connected to the rotary drive mechanism 3 is the driving shaft, and the remaining coupling shafts 10 are driven shafts. They are arranged sequentially and spaced apart along the circumference of the driving shaft with the driving shaft as the center. A gear 11 is installed on the outer circumferential surface of each coupling shaft 10. The driven shafts are all connected to the driving shaft through gear meshing.

[0034] The outer peripheral surface of the sliding connecting plate 8 slides against the inner peripheral surface of the housing 1. The vibration generating unit 4 is installed inside the housing 1 and connected to the top surface of the vibration connecting plate 9. The vibration generating unit 4 is close to the feed inlet 5 of the filter body. The vibration generating unit 4 is an electromagnetic vibrator or an eccentric vibration motor, which generates high-frequency (e.g., 50-2000 Hz) and low-amplitude (e.g., 10-200 μm) axial vibration.

[0035] The outer circumferential surface of the cleaning arm 12 is provided with a T-shaped groove 15, which is an elongated groove opened along the axis. A scraper 13 is installed within the T-shaped groove 15, elastically mounted within it by several springs 14. One end of the scraper 13 is placed within the T-shaped groove 15 and can slide radially along the cleaning arm 12, while the other end abuts against the inner wall of the filter pores. The springs 14 are positioned between the scraper 13 and the T-shaped groove 15, providing radial thrust to the scraper 13. This structure constitutes an adaptive tensioning system: regardless of the slight geometric deformation of the ceramic membrane module 2 due to thermal expansion and contraction or changes in operating pressure, the scraper 13 can automatically adjust its position under the elastic force of the springs 14, always maintaining constant force contact with the membrane wall. This not only ensures the thorough removal of contaminants but also avoids the mechanical wear caused by rigid scraping on the surface of the expensive ceramic membrane, significantly extending the service life of the membrane module.

[0036] The above-described working method of the self-cleaning ceramic membrane filtration device based on vibration and rotation coupling is as follows: First, the raw water to be treated is introduced into the interior of the housing 1 through the feed port 5 on the housing 1. Under the drive of external pressure, the water flows through the micropores of the ceramic membrane component 2 to achieve liquid-solid separation. The purified water is discharged through the water outlet 6. At the same time, the suspended solids and impurities intercepted by the ceramic membrane component 2 are collected with the water flow to form a high-concentration concentrate, which is discharged through the concentrate outlet 7 at the bottom or side wall of the housing 1, thereby completing the basic filtration cycle.

[0037] While the filtration process continues, the power system of the device is activated to implement a self-cleaning mechanism. First, the rotary drive mechanism 3 is activated, and its output shaft drives one of the coupling shafts 10 to rotate. Since all coupling shafts 10 are fixedly connected with meshing gears 11, the rotational power is synchronously transmitted to all coupling shafts 10 through the gear transmission 11, ensuring that each coupling shaft 10 rotates at the same low speed, which is 5-50 rpm.

[0038] Simultaneously, the vibration generating unit 4 is activated, driving most of the coupled shafts 10 connected to it to undergo high-frequency axial (vertical) vibration via the vibration connecting plate 9. Since the coupled shafts 10 pass through and are slidably connected to the sliding connecting plate 8, and some coupled shafts 10 are rotatably connected to the vibration connecting plate 9 via bearings, the coupled shafts 10 can maintain their independent rotation while vibrating with the overall vibration of the vibrating plate. This mechanical connection method couples vibration and rotation onto a single coupled shaft 10, achieving a composite motion output of rotation and vibration.

[0039] The coupling shaft 10 drives the cleaning arm 12. The scraper on the cleaning arm 12 performs cleaning work on the ceramic membrane under the action of rotation and vibration. The spring 14 provides a continuous radial preload to the scraper 13, so that the other end of the scraper 13 is always in close contact with the inner wall of the ceramic membrane filter pore.

[0040] In summary, multi-axis synchronous rotation is achieved through gear 11 meshing, and overall high-frequency vibration is achieved through vibration connecting plate 9. Combined with the pre-tightened scraper 13 structure of spring 14, real-time, active, and dead-angle-free cleaning of the inner wall of the ceramic membrane is realized during the filtration process, which greatly improves filtration efficiency and continuous production performance.

Claims

1. A self-cleaning ceramic membrane filtration device based on vibration and rotation coupling, comprising a filter device body, wherein a ceramic membrane assembly (2) is installed inside the housing (1) of the filter device body, characterized in that: A cleaning arm (12) is inserted into each of the multiple filter holes of the ceramic membrane module (2). A coupling shaft (10) is coaxially connected to one end of each cleaning arm (12). A sliding connecting plate (8) and a vibration connecting plate (9) are spaced apart inside the housing (1) along the axial direction. The coupling shafts (10) are inserted into the sliding connecting plate (8). A rotary drive mechanism (3) is installed at the bottom of the vibration connecting plate (9). One coupling shaft (10) is connected to the rotary drive mechanism (3) and to the coupling shaft (10). The other coupling shafts (10) are rotatably connected to the vibration connecting plate (9). The outer circumferential surface of the sliding connecting plate (8) slides against the inner circumferential surface of the housing (1). A vibration generating unit (4) is installed inside the housing (1) and connected to the top surface of the vibration connecting plate (9). A scraper (13) is installed on each cleaning arm (12). The scraper (13) abuts against the inner circumferential wall of the filter hole.

2. The self-cleaning ceramic membrane filtration device based on vibration and rotational coupling according to claim 1, characterized in that: The coupling shaft (10) connected to the rotary drive mechanism (3) is the driving shaft, and the other coupling shafts (10) are driven shafts, which are arranged sequentially at intervals along the circumference of the driving shaft with the driving shaft as the center.

3. The self-cleaning ceramic membrane filtration device based on vibration and rotational coupling according to claim 2, characterized in that: Each coupling shaft (10) has a gear (11) installed on its outer circumferential surface, and the driven shaft is connected to the driving shaft through gear meshing.

4. The self-cleaning ceramic membrane filter device based on vibration and rotational coupling according to claim 2, characterized in that: The driven shaft and the vibration connecting plate (9) are connected by a bearing.

5. The self-cleaning ceramic membrane filter device based on vibration and rotational coupling according to claim 1, characterized in that: At least one long T-shaped groove (15) is provided on the outer peripheral surface of the cleaning arm (12) along its axial direction. The scraper (13) is disposed in the T-shaped groove (15) and connected to the inside of the T-shaped groove (15) by multiple springs (14).

6. The self-cleaning ceramic membrane filter device based on vibration and rotational coupling according to claim 1, characterized in that: The vibration generating unit (4) is located near the feed inlet (5) of the filter body.

7. The self-cleaning ceramic membrane filter device based on vibration and rotational coupling according to claim 1, characterized in that: The rotary drive mechanism (3) is a servo motor or a geared motor.

8. The self-cleaning ceramic membrane filter device based on vibration and rotational coupling according to claim 1, characterized in that: The vibration generating unit (4) is an electromagnetic vibrator or an eccentric vibration motor.

9. A method for operating a self-cleaning ceramic membrane filter device based on vibration and rotational coupling as described in any one of claims 1 to 8, characterized in that... Includes the following steps: Step 1: The filter device body starts and performs basic filtration cycle operation. At the same time, the rotary drive mechanism (3) starts, and its output shaft drives one of the coupling shafts (10) to rotate and drives the other coupling shafts (10) to rotate together. Step 2: Each coupling shaft (10) rotates at the same speed at low speed, driving the cleaning arm (12) to rotate. At the same time, the vibration generating unit (4) is started, driving the coupling shaft (10) connected to it to perform axial high-frequency vibration through the vibration connecting plate (9). Step 3: The scraper (13) on the cleaning arm (12) cleans the ceramic membrane module (2), and at the same time, the axial vibration is transmitted to the membrane surface and the fluid nearby through the cleaning arm, which reduces the adhesion of pollutants to the membrane surface and facilitates the scraper cleaning operation.

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