Rotary cross-flow ceramic membrane filtering device

Abstract

The rotary cross-flow ceramic membrane filtering device comprises a shell, a main shaft unit arranged in the shell and a power unit for driving the main shaft unit to rotate, the power unit provides rotating power for the main shaft unit and drives the filtering disc to rotate, the main shaft unit is installed in the shell and executes a specific filtering task, and the shell provides necessary support and protection for the main shaft unit and the power unit and controls inflow and outflow of materials. According to the rotary cross-flow ceramic membrane filtering device provided by the invention, the ceramic membrane filtering disc is arranged, so that the filtering efficiency and the system stability are improved, the operation cost is reduced, and the rotary cross-flow ceramic membrane filtering device is suitable for being widely applied to various industrial fields needing efficient filtering solutions.

Description

Technical Field

[0001] The invention belongs to the field of filtration and purification, and in particular relates to a rotating cross-flow ceramic membrane filtration device. Background Art

[0002] Cross-flow filtration, also known as tangential flow filtration, is a filtration method in which the liquid flows parallel to the membrane surface when passing through the membrane surface. Unlike dead-end filtration, in cross-flow filtration, part of the liquid passes through the membrane to become filtrate, while the unfiltered part continues to flow on the membrane surface as concentrate, thereby reducing the risk of particle deposition and membrane clogging. This technology has been widely used in many fields such as food and beverage, pharmaceuticals, chemicals and water treatment to remove suspended solids, clarify liquids, concentrate solutions or separate different components in mixtures.

[0003] Although traditional cross-flow filtration technology has achieved remarkable application results, it still faces some difficult-to-overcome technical challenges in practical engineering applications. Traditional tubular ceramic membranes are prone to clogging when processing materials with high viscosity or containing a large number of solid particles due to their relatively small internal channels. This not only limits the processing capacity of the system, but may also cause equipment failure and increase maintenance costs. In order to maintain the ideal cross-flow flow rate to ensure effective filtration and slow down the membrane fouling rate, traditional systems usually require extremely high energy input to drive the pumping mechanism. This high energy consumption demand not only increases operating costs, but also is not conducive to the realization of energy-saving and environmental protection goals. The large shear force generated in the traditional cross-flow filtration process can damage sensitive substances, and is accompanied by high heat generation, which may have adverse effects on heat-sensitive substances and accelerate equipment aging. Over time, the flux of traditional cross-flow filters decreases rapidly due to the gradual accumulation of pollutants on the membrane surface. Although frequent cleaning can temporarily restore the flux, it seriously affects production efficiency and also brings additional workload to operators. Summary of the invention

[0004] The object of the present invention is to provide a rotating cross-flow ceramic membrane filtration device to solve the technical problems of clogging of high-viscosity and high-solid content materials, reducing energy consumption, and flux attenuation and cleaning frequency.

[0005] To achieve the above purpose, the specific technical solution of a rotating cross-flow ceramic membrane filtration device of the present invention is as follows:

[0006] A rotating cross-flow ceramic membrane filtration device comprises a housing, a main shaft unit arranged in the housing, and a power unit driving the main shaft unit to rotate;

[0007] The spindle unit comprises a hollow shaft body and a plurality of filter discs arranged on the shaft body; a collecting pipe is arranged in the shaft body, the collecting pipe is opened at one end of the shaft body connected to the power unit, the filter disc is provided with a collecting groove, the shaft body is provided with a connecting hole connected with the collecting pipe, the surface of the filter disc is covered with a ceramic membrane, and the filtrate enters the collecting groove through the ceramic membrane and then enters the collecting pipe through the connecting hole;

[0008] The power unit comprises a driving motor and a connecting structure connecting the driving motor and the shaft body; the connecting structure comprises a connecting shell connected to the shell, and a connecting shaft connecting the driving motor and the shaft body; the connecting shaft is rotatably connected to the connecting shell in the connecting shell, a connecting pipe is hollowly arranged in the connecting side of the connecting shaft and the shaft body, the connecting pipe is communicated with the collecting pipe, the connecting shell is provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are communicated with the connecting pipe;

[0009] The shell surface is provided with a feed inlet and a discharge outlet for the material to be filtered to enter and exit the shell before and after filtering.

[0010] As a further improvement of the present invention, a connector for mounting the filter disc is provided on the shaft, and a connecting groove connecting the collecting groove and the communicating hole is provided on the connector.

[0011] As a further improvement of the present invention, the connector is provided with a connecting portion protruding toward the filter disc, the connecting portion is concavely provided with the connecting groove, the filter disc is sleeved on the outside of the connecting portion, and the collecting groove is connected to the connecting groove.

[0012] As a further improvement of the present invention, a sealing gasket is provided between the connector and the filter disc, and the sealing gasket is in a discontinuous protrusion shape on one side facing the filter disc.

[0013] As a further improvement of the present invention, a protrusion is formed on the outer surface of the shaft body corresponding to the outer side of the opening end of the collecting pipe, and the connector and the filter disc are stacked in sequence along the surface of the shaft body from the protrusion. An external thread section is provided on the surface of the shaft body away from the protrusion, and a locking nut presses the connector and the filter disc onto the surface of the shaft body on the external thread section.

[0014] As a further improvement of the present invention, the connecting shaft is connected to the connecting housing via a bearing, and drives the shaft body to rotate under the drive of the driving motor.

[0015] As a further improvement of the present invention, a connecting port is provided on the side of the shell, the connecting shell covers the connecting port from the outside of the shell, and the connecting shaft passes through the connecting port into the shell to connect with the shaft body.

[0016] As a further improvement of the present invention, the shaft body is cylindrical, the collecting pipe is arranged inside the shaft body along the axial direction of the shaft body, and the connecting hole is arranged along the radial direction of the shaft body.

[0017] As a further improvement of the present invention, one end of the shaft is connected to the connecting structure, and the other end is rotatably connected to the shell.

[0018] As a further improvement of the present invention, the liquid inlet discharges cleaning liquid to reversely flush the filter disc, and the liquid outlet discharges the filtrate collected by the filter disc. The liquid inlet and the liquid outlet are respectively controlled to open and close by valves.

[0019] Beneficial effects:

[0020] By adopting a rotating design, the material is forced to pass through the ceramic membrane surface under the action of centrifugal force, effectively avoiding the blockage of small channels caused by high viscosity or large amounts of solid particles. This not only improves the processing capacity of the system, but also reduces equipment failure rate and maintenance costs.

[0021] The tangential flow velocity generated by rotation is used to reduce membrane fouling, without relying on extremely high liquid flow rates to maintain ideal cross-flow conditions, thereby greatly reducing the energy input required to achieve the ideal cross-flow flow rate, saving operating costs, and meeting energy-saving and environmental protection requirements.

[0022] The rotary motion replaces the traditional high-pressure drive method, reducing shear damage to sensitive materials and also reducing heat generation during operation, helping to protect heat-sensitive materials and extend equipment life.

[0023] The use of rotating cross-flow can more effectively slow down the rate of flux attenuation, reduce the cleaning frequency, improve production efficiency, and reduce the labor burden. In addition, the backwash function further ensures long-term stable performance.

[0024] The annular raised connection part on the connector provides an additional mechanical support point for the filter disc, allowing the filter disc to be installed more firmly on the shaft body, which not only increases the contact area, but also ensures better centering through physical shape, reducing vibration and displacement during operation. The connection groove is located inside the connector and is directly connected to the collection groove on the filter disc. This tight connection method enhances the sealing of the entire system, prevents filtrate leakage or material mixing, and ensures the purity of the filtration process. The collection pipe and connecting hole design inside the shaft body simplifies the filtrate collection process; the connecting shaft is rotatably connected through the bearing to ensure the stability and reliability of power transmission. The concave connection groove helps to guide the filtrate from the collection groove on the surface of the filter disc to the connecting hole in the shaft body, and then enters the collection pipe. This design simplifies the liquid flow path, reduces pressure loss, and improves filtration efficiency. Since the connection groove is directly connected to the collection groove, the liquid retention area that may occur in the traditional design is avoided, which helps to keep the system clean and reduce bacterial growth or accumulation of other contaminants.

[0025] The filter discs and connectors are stacked in sequence along the surface of the shaft from the protrusion and tightened by the locking nut, which is convenient for disassembly and installation, and easy for daily maintenance and cleaning. The power unit and the spindle unit are connected by a carefully designed connection structure to ensure the stable operation of the entire system; the connection port set on the side of the shell and the connection shell covering the connection port provide additional safety protection to prevent leakage or other unexpected situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a rotating cross-flow ceramic membrane filtration device of the present invention;

[0027] Figure 2 It is a schematic diagram of the power unit structure;

[0028] Figure 3 This is a schematic diagram of the main shaft unit structure;

[0029] Figure 4 is a schematic diagram of the shell structure;

[0030] Figure 5 It is a schematic diagram of the connector and filter disc structure;

[0031] Explanation of marks in the figure: Explanation of marks in the figure: 1. Shell; 11. Feed inlet; 12. Discharge port; 13. Connection port; 2. Spindle unit; 21. Shaft body; 211. Collecting pipe; 212. Connecting hole; 213. Protrusion; 214. External thread section; 22. Filter disc; 221. Collecting tank; 23. Connector; 231. Connecting part; 232. Connecting tank; 233. Sealing gasket; 24. Locking nut; 3. Power unit; 31. Driving motor; 32. Connection structure; 321. Connecting shell; 3211. Liquid inlet; 3212. Liquid outlet; 322. Connecting shaft; 3221. Connecting pipe. DETAILED DESCRIPTION

[0032] In order to better understand the purpose, structure and function of the present invention, a rotating cross-flow ceramic membrane filtration device of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0033] Implementation example:

[0034] like Figure 1 A rotating cross-flow ceramic membrane filter device is shown, comprising a housing 1, a spindle unit 2 and a power unit 3. The spindle unit 2 is located inside the housing 1 and is driven to rotate by the power unit 3 to achieve efficient cross-flow filtration. Its rotational motion generates a tangential flow velocity, which helps to improve filtration efficiency and reduce clogging.

[0035] like Figure 2As shown, the drive motor 31 is the core component of the power unit 3, which provides the mechanical power required to rotate the spindle unit 2. In this embodiment, the drive motor is a reduction motor, which helps to provide greater torque at a lower speed and ensure that the filter disc 22 can rotate stably and efficiently. The connection structure 32 is a bridge between the power unit 3 and the spindle unit 2. The connection shell 321 covers the connection port 13 on the side of the shell 1, plays a role in protecting the internal components, and is fixed to the shell 1 by bolts. One end of the connecting shaft 322 is connected to the drive shaft of the drive motor 31, and the other end extends into the shell 1 and is connected to the shaft body 21 in the spindle unit 2. The connecting shaft 322 is hollow inside and is provided with a connecting pipe 3221, which is connected to the collection pipe 211 in the spindle unit 2 for transmitting filtrate and backwashing liquid. A bearing is installed in the connecting shell 321 to support the connecting shaft 322 and allow it to rotate freely, ensuring the stability of power transmission. The liquid inlet 3211 and the liquid outlet 3212 on the connecting housing 321 allow the introduction of backwashing liquid to help remove dirt on the surface of the filter disc 22, maintain the filtering performance, and extend the service life of the equipment. The liquid outlet 3212 discharges the filtrate collected by the spindle unit 2. During normal use, the liquid outlet valve is opened to allow the filtrate to be continuously discharged from the liquid outlet 3212, and the liquid inlet valve is closed; when cleaning is required, the liquid inlet valve is opened and the liquid outlet valve is closed, and the cleaning liquid is discharged through the liquid inlet 3211 to backwash the filter disc 22.

[0036] like Figure 3 As shown, the spindle unit 2 is the main execution unit of the device. The shaft body 21 is cylindrical and serves as the skeleton of the entire spindle unit 2. It supports and fixes all filter components. The radially arranged connecting holes 212 and the internally arranged collecting pipes 211 arranged along the axial direction play a key role in transmitting filtrate and are used to collect filtrate collected from each filter disc 22. The collecting pipe 211 is arranged along the axial direction of the shaft body 21, with one end opening connected to the connecting structure 32 and the other end closed inside the shaft body 21. Figure 5As shown, the filter disc 22 is arranged along the shaft 21, and the two sides are clamped by the connector 23 that is sleeved on the shaft 21. Each disc is evenly spaced inside with a collection groove 221, and the surface is covered with a ceramic membrane. The ceramic membrane on the filter disc 22 filters the passing material, intercepts solid particles or macromolecular substances, and allows the filtrate to pass through and enter the collection groove 221. The connector 23 is an annular structure with a protrusion on one side, and is sleeved on both sides of the filter disc 22 on the shaft 21 through the hole in the annular structure. The protruding part is an annular connecting part 231. The connecting part 231 is provided with a connecting groove 232 connected to the communicating hole 212 in the radial direction relative to the shaft 21. When the filter disc 22 is sleeved on the outer periphery of the connecting part 231, the connecting groove 232 is connected with the collecting groove 221, and the filtrate finally flows into the collecting pipe 211 in the shaft 21 through the connecting groove 232. The open end of the collection pipe is provided with a relative protrusion 213 on the shaft body 21, and the connector 23 and the filter disc 22 are installed along the shaft body 21 in sequence from the protrusion 213. The closed end of the collection pipe forms an external thread section 214 on the surface of the shaft body, and the locking nut 24 squeezes the connector 23 on the external thread section 214 to press the filter disc 22. The connector 23 is provided with a connecting groove connecting the collection groove and the connecting hole 212. One end of the shaft body 21 is connected to the power unit 3, and the other end is connected to the housing 1 through the shaft sleeve. It rotates smoothly under the drive provided by the power unit 3, reducing unnecessary vibration and energy loss, and ensuring a long-term stable working state.

[0037] like Figure 4 As shown, the shell 1 serves as the outer shell of the entire device, providing a closed space for accommodating the material to be processed and providing mechanical protection for the internal components. It not only plays a role of physical isolation to prevent external pollutants from entering the system, but also maintains the stability of the operating environment. A connecting port 13 is provided on one side of the shell 1 for the connecting shaft 322 to pass through and connect to the shaft body 21, and the opposite side is rotatably connected to the shaft body 21. A discharge port 12 and a feed port 11 are provided on the upper and lower sides respectively, and the material to be filtered enters from the feed port 11 and is discharged from the discharge port 12 after filtration. The liquid inlet, liquid outlet, feed port and discharge port are provided with quick interfaces to make the operation more convenient and improve the user experience.

[0038] When in use, the material to be processed is pumped into the closed housing through the feed port 11 on the housing 1. After the reduction motor in the power unit 3 is started, the rotational power is transmitted to the hollow shaft body 21 in the main shaft unit 2 through the connecting shaft 322. The shaft body 21 drives the multiple filter discs 22 installed thereon to rotate together. The rotational motion generates a tangential flow velocity on the surface of the filter disc 22, so that the material is forced to flow through the surface of the ceramic membrane in a tangential direction instead of directly impacting the membrane surface. This flow mode helps to reduce the chance of particles depositing on the membrane surface, thereby reducing the risk of clogging, and can more effectively utilize the membrane area for filtration. Under the action of centrifugal force, the liquid part of the material passes through the disc ceramic membrane on the filter disc and becomes filtrate. Due to the shear effect generated by the rotation, particles can be prevented from adhering to the membrane surface, further reducing the possibility of clogging. The filtrate flows into the collection tank set on the surface of the filter disc, and then enters the collection pipe 211 inside the shaft body through the connecting hole on the shaft body, and finally discharged from the liquid outlet 3212 located on one side of the power unit 3. The filtered concentrate (unfiltered portion) continues to flow tangentially and is continuously mixed with new materials during the rotation of the spindle unit 2, maintaining the dynamic balance of the entire system. At the same time, the excess materials are discharged from the system through the discharge port 12 on the shell. When a certain amount of pollutants accumulate on the surface of the filter disc 22, backwashing liquid can be introduced through the liquid inlet 3211. The backwashing liquid enters through the liquid inlet on the power unit and flows in the opposite direction to help remove dirt on the surface of the filter disc 22 and restore the filtering performance. This process is controlled by a valve to ensure on-demand operation.

[0039] Through the above mechanism, the device can maintain high filtration efficiency when processing high-viscosity materials with more solid particles, while reducing the problems of high energy consumption, high shear force and frequent cleaning in traditional cross-flow filtration technology. In addition, the rotation design also reduces the speed of membrane fouling, prolongs the service life of the equipment, and improves the continuity and stability of production.

[0040] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A rotating cross-flow ceramic membrane filtration device, characterized in that: It includes a housing, a spindle unit arranged in the housing, and a power unit driving the spindle unit to rotate; The spindle unit comprises a hollow shaft body and a plurality of filter discs arranged on the shaft body; a collecting pipe is arranged in the shaft body, the collecting pipe is opened at one end of the shaft body connected to the power unit, the filter disc is provided with a collecting groove, the shaft body is provided with a connecting hole connected with the collecting pipe, the surface of the filter disc is covered with a ceramic membrane, and the filtrate enters the collecting groove through the ceramic membrane and then enters the collecting pipe through the connecting hole; The power unit includes a driving motor and a connecting structure connecting the driving motor and the shaft; the connecting structure includes a connecting shell connected to the shell, and a connecting shaft connecting the driving motor and the shaft; The connecting shaft is rotatably connected to the connecting housing in the connecting housing, a connecting pipe is hollowly arranged in the connecting side of the connecting shaft and the shaft body, the connecting pipe is communicated with the collecting pipe, and the connecting housing is provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are communicated with the connecting pipe; The shell surface is provided with a feed inlet and a discharge outlet for the material to be filtered to enter and exit the shell before and after filtering.

2. The rotating cross-flow ceramic membrane filtration device according to claim 1, characterized in that: The shaft body is provided with a connector for mounting the filter disc, and the connector is provided with a connecting groove connecting the collecting groove and the communicating hole.

3. The rotating cross-flow ceramic membrane filtration device according to claim 2, characterized in that: The connector is provided with a connecting portion protruding toward the filter disc, the connecting portion is concavely provided with the connecting groove, the filter disc is sleeved on the outside of the connecting portion, and the collecting groove is communicated with the connecting groove.

4. The rotating cross-flow ceramic membrane filtration device according to claim 2, characterized in that: A sealing gasket is arranged between the connector and the filter disc, and the sealing gasket is in a discontinuous protrusion shape toward the filter disc.

5. The rotating cross-flow ceramic membrane filtration device according to claim 2, characterized in that: A protrusion is formed on the outer surface of the shaft corresponding to the outer side of the opening end of the collecting pipe, and a plurality of the connectors and the filter discs are stacked in sequence along the surface of the shaft from the protrusion. An external thread section is provided on the surface of the shaft away from the protrusion, and a locking nut presses the connector and the filter disc onto the surface of the shaft on the external thread section.

6. The rotating cross-flow ceramic membrane filtration device according to claim 1, characterized in that: The connecting shaft is connected to the connecting housing through a bearing, and drives the shaft body to rotate under the drive of the driving motor.

7. The rotating cross-flow ceramic membrane filtration device according to claim 1, characterized in that: A connecting port is provided on the side of the shell, and the connecting shell covers the connecting port from the outside of the shell. The connecting shaft passes through the connecting port and enters the shell to be connected with the shaft body.

8. The rotating cross-flow ceramic membrane filtration device according to claim 1, characterized in that: The shaft body is cylindrical, the collecting pipe is arranged inside the shaft body along the axial direction of the shaft body, and the communicating hole is arranged along the radial direction of the shaft body.

9. The rotating cross-flow ceramic membrane filtration device according to claim 1, characterized in that: One end of the shaft is connected to the connection structure, and the other end is rotatably connected to the shell.

10. The rotating cross-flow ceramic membrane filtration device according to claim 1, characterized in that: The liquid inlet discharges cleaning liquid to reversely flush the filter disc, and the liquid outlet discharges the filtrate collected by the filter disc. The liquid inlet and the liquid outlet are respectively controlled to open and close by valves.

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