Membrane core assembly and membrane separation apparatus using the same

Abstract

The utility model discloses a membrane core subassembly and adopt its membrane separation equipment belongs to membrane separation device field, including the hollow membrane core body, the inside of membrane core body is provided with a plurality of filter pipe for filtering along the axial direction, along the axial direction of membrane core body, from top to bottom is equipped with feeding section, connecting section and discharge section in proper order, the outer periphery of connecting section is provided with the one -way valve for leading into gas, the one -way valve surrounds the arrangement of connecting section, the side wall of connecting section is equipped with the air inlet hole of intercommunication with one -way valve, the connecting section is divided into the air -intaking portion of upper portion and the turbulence portion of lower portion on the axial direction, the outside wall of turbulence portion is provided with at least two section spaced ring turbulence groove each other along the circumferential direction, for forming segmented turbulence effect after gas enters, still include the membrane separation equipment of preceding membrane core subassembly.

Description

Technical Field

[0001] This utility model relates to the field of membrane separation devices, and more particularly to a membrane core assembly and a membrane separation device using the same. Background Technology

[0002] Membrane separation equipment is widely used in water treatment, chemical industry, bioengineering, food processing, and wastewater recovery. Traditional membrane elements typically have only a single liquid filtration channel. During filtration, concentration polarization and fouling layers formed on the membrane surface by the feed liquid lead to flux reduction, increased pressure differential, and increased cleaning frequency. To improve the problem of fouling deposition, existing technologies have attempted to introduce gas turbulence or backflushing mechanisms, but most of them have the following drawbacks: First, the gas channel and liquid channel are not effectively isolated, which easily leads to gas-liquid crossflow or backflow, resulting in decreased equipment sealing and stability; Second, the gas supply location and turbulence structure are not reasonably arranged, making it difficult for the gas to form a stable and directional turbulence effect near the membrane surface, resulting in limited cleaning efficiency; Third, some structures mix the gas passage and the connection part, which not only affects the installation and fixation of the membrane element, but also easily causes sealing failure or leakage at the connection.

[0003] The lack of a dedicated gas introduction design for existing membrane modules, which is why external gas supply cannot achieve flushing and disturbance without interrupting filtration. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the present invention proposes a membrane core assembly and a membrane separation device using the same.

[0005] To achieve this objective, the present invention adopts the following technical solution: A membrane core assembly includes a hollow membrane core body. A plurality of filter tubes for filtration are arranged axially inside the membrane core body. From top to bottom, a feed section, a connecting section, and a discharge section are sequentially arranged along the axial direction of the membrane core body. A one-way valve for introducing gas is arranged around the outer periphery of the connecting section. An air inlet communicating with the one-way valve is opened on the side wall of the connecting section. The connecting section is axially divided into an upper air inlet section and a lower turbulence section. At least two annular turbulence grooves spaced apart from each other are arranged circumferentially on the outer wall of the turbulence section to create a segmented turbulence effect after gas enters.

[0006] The superior technical solution of this utility model is that the width of the connecting section is greater than that of the feeding section, the connecting section includes a turbulence part and an air inlet part, the width of the air inlet part is greater than that of the turbulence part; the one-way valve and the air inlet hole are disposed on the air inlet part, and an annular turbulence groove is disposed on the outer wall of the turbulence part, the turbulence groove being located at the outlet of the one-way valve.

[0007] The superior technical solution of this utility model is that the turbulence groove is arranged along the outer periphery of the turbulence part and has a spiral, wave-like or multi-segment distribution structure.

[0008] The superior technical solution of this utility model is that the connecting section further includes a connecting part, which is disposed below the air inlet. The connecting part is used to connect with the mold shell by a threaded lock, and the connecting part is not connected to the one-way valve.

[0009] The superior technical solution of this utility model is that the inner diameter of the filter tube is 5-30mm, the number is 4-50, and they are evenly arranged along the circumference of the membrane core body.

[0010] The superior technical solution of this utility model is that the turbulence groove has a spiral structure and extends continuously around the outer wall of the turbulence part at least once.

[0011] The superior technical solution of this utility model is that the depth of the turbulence channel is 0.5-3mm and the width of the channel is 1-5mm.

[0012] The superior technical solution of this utility model is that the membrane core body is a modular structure, and the feeding section, the connecting section and the discharging section can be installed by threads, snaps or sealing rings.

[0013] The superior technical solution of this utility model is that the bottom or wall of the turbulence channel is provided with a number of micro-holes or openings for forming secondary turbulence or guiding and diverting effects.

[0014] A membrane separation device includes a membrane core assembly as described in any one of the above claims, and is connected to a liquid feed system or a backflushing gas supply device.

[0015] The beneficial effects of this utility model are as follows: This invention separates the air inlet from the liquid filtration channel and uses a one-way valve to prevent liquid backflow, thus avoiding gas-liquid crossflow problems. After the gas is introduced at the turbulence groove, it can form circumferential or spiral disturbances along the outer periphery of the membrane core, thereby reducing fouling deposition and improving the membrane surface condition. The connection part is independent of the air supply area, which ensures the stable installation of the mold core and prevents gas from entering the discharge path or causing leakage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the membrane core assembly provided in a specific embodiment of this utility model; Figure 2 This is a schematic diagram of the overall structure of the membrane core assembly provided in a specific embodiment of this utility model; Figure 3 This is a schematic diagram of the one-way valve of the membrane core assembly provided in a specific embodiment of this utility model; Figure 4This is a schematic diagram of the internal structure of the membrane core assembly provided in a specific embodiment of this utility model; Figure 5 This is a schematic diagram of the membrane separation device provided in a specific embodiment of this utility model; In the picture: 1. Membrane core body; 2. Filter tube; 3. Feed section; 4. Connecting section; 5. Discharge section; 6. One-way valve; 7. Air inlet; 9. Turbulence section; 10. Air inlet section; 11. Turbulence groove; 12. Connecting section. Detailed Implementation The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] Example 1 like Figure 1-4 As shown, this embodiment provides a membrane core assembly, including a hollow membrane core body 1, with a plurality of filter tubes 2 evenly distributed axially inside the membrane core body 1. The filter tubes 2 can be made of polyvinylidene fluoride (PVDF), polypropylene (PP), or polytetrafluoroethylene (PTFE) to meet the requirements of corrosion resistance, mechanical strength, and filtration accuracy under different fluid filtration environments. The filter tubes 2 are arranged in a circumferential array, with the upper end of each filter tube 2 connected to the feed section 3 and the lower end flowing into the discharge section 5, thereby forming an independent filtration channel.

[0018] The membrane core body 1 is divided into a feeding section 3, a connecting section 4, and a discharging section 5 along its length from top to bottom. The feeding section 3 is equipped with a feed inlet, which is connected to a pump or pressure vessel through a conduit to introduce the raw material liquid into the membrane core.

[0019] A one-way valve 6 is installed on the outer periphery of the connecting section and communicates with the air inlet 7. The air inlet 7 is opened on the side wall of the connecting section 4 and communicates with the one-way valve 6. The one-way valve 6 adopts a valve plate type or valve diaphragm type structure. When the external fluid enters from the feeding direction, the valve plate automatically opens, and when there is reverse pressure, it automatically closes, thereby realizing one-way flow control and avoiding impurity backflow and backflow.

[0020] During operation, the raw material fluid enters through the feed section 3, while the gas enters the connecting section 4 through the air inlet 7 and the one-way valve 6, and then enters the membrane core body 1 after being disturbed. The clean fluid after membrane separation flows inside the filter tube 2 and is finally discharged through the discharge section 5, completing the filtration or separation process. This not only ensures the unidirectionality of the fluid but also achieves a high-efficiency filtration effect through a reasonable pipeline layout.

[0021] The width of connecting section 4 is greater than that of feeding section 3. Connecting section 4 is further divided into an air inlet section 10 and a turbulence section 9, with the air inlet section 10 located at the top and wider than the turbulence section 9, used to install the one-way valve 6 and the air inlet port 7, and the turbulence section 9 located at the bottom, used to set up the turbulence groove 11. Through this segmented structure, the air inlet section 10 undertakes the function of fluid entry, and the turbulence section 9 undertakes the function of disturbance distribution, with a clear structural hierarchy.

[0022] An annular turbulence groove 11 is formed on the outer wall of the turbulence section 9. The turbulence groove 11 can take various forms, such as a spiral structure, where the groove extends spirally along the outer wall of the membrane core to form a swirling flow and enhance circumferential turbulence; a wave-like structure, where the groove wall undulates in a wave shape, generating pulsating turbulence when the fluid flows through; or a multi-segmented distributed structure: the groove is divided into several segments and arranged in a staggered manner along the circumference, which can disperse the laminar flow of the fluid. These forms can all effectively improve the distribution of the fluid, allowing the gas to enter the membrane core body uniformly and preventing deposition.

[0023] A connecting part 12 is further provided below the connecting section 4. The connecting part 12 is used for a sealed connection with the mold shell, usually using a threaded lock and a sealing ring to achieve a reliable fastening. The connecting part 12 is not connected to the one-way valve 6, ensuring that the gas or liquid flow path does not pass through the connecting part 12, thereby avoiding the risk of leakage and improving structural safety.

[0024] The size and number of filter tubes 2 can be adjusted as needed. Preferably, the inner diameter of filter tubes 2 is 5-30 mm, and the number is 4-50, evenly arranged along the circumference of the membrane core body 1. A smaller number results in lower resistance and higher flux, suitable for low-pressure scenarios; a larger number results in a larger filtration area and higher precision, suitable for high-pressure or high-pollutant scenarios. The filter tubes 2 are fixed inside the membrane core by end caps or support plates to ensure stability and sealing.

[0025] The turbulence groove 11 can be designed as a spiral structure, extending continuously around the turbulence section 9 for at least one turn, preferably 1.5-3 turns, to enhance the turbulence intensity. The groove depth of the turbulence groove 11 is 0.5-3 mm, and the groove width is 1-5 mm. A smaller groove depth (0.5 mm) is suitable for low-speed fluid applications; a larger groove depth (3 mm) can maintain a strong turbulence effect in high-speed applications. The groove width needs to be balanced between manufacturing feasibility and turbulence intensity.

[0026] The membrane core body 1 can adopt a modular design. The feed section 3, connecting section 4, and discharge section 5 are assembled via threads, snaps, or sealing rings. The advantage is that individual sections can be replaced; for example, feed section 3 can be replaced when the air intake environment changes, and connecting section 4 can be replaced when the connection strength is insufficient. This modular assembly and disassembly method reduces maintenance costs and improves the adaptability of the device.

[0027] Several micropores can also be formed on the bottom or wall of the turbulence channel 11. These micropores have a diameter between 0.1-2 mm and are evenly distributed along the channel. When the fluid passes through the turbulence channel 11, part of the fluid is ejected through the micropores, forming secondary turbulence, enhancing the local turbulence effect, and reducing the risk of deposition. After the gas enters the inner cavity of the connecting section 4 through the air inlet 7 and the one-way valve 6, it is transmitted downward to the area where the turbulence section 9 is located under the action of axial pressure difference or circumferential guide gap. An annular guide space is formed between the turbulence section 9 and the membrane shell. The gas enters the annular turbulence channel 11 through this guide space and flows in segments or diffuses tangentially along the channel, so that the turbulent airflow is distributed in the filtration area on the outer periphery of the membrane core, thereby creating disturbance, scouring or shearing effects on the membrane surface.

[0028] Example 2 like Figure 5 As shown, it can also be used in membrane separation equipment. After the raw liquid enters the membrane core through the feed section 3, it is distributed among several internal filter tubes 2 and separated under the action of transmembrane pressure difference. The permeate is discharged through the discharge section 5, and the concentrate is discharged or recirculated according to the equipment flow. During filtration operation, the air inlet 7 located on the side wall of the connecting section 4 does not participate in liquid transport, and the one-way valve 6 is closed, thereby preventing the process liquid from flowing back into the external gas path through the air inlet 7.

[0029] When it is necessary to agitate the membrane surface or filtration area, mitigate fouling, or perform online cleaning, compressed air, nitrogen, or other inert gases can be supplied to the component through the air inlet 7. The gas enters the connecting section 4 through the annular one-way valve 6 and is then introduced into the turbulence section 9 through the one-way valve 6. The one-way valve 6 only allows gas to enter from the outside to the inside, preventing liquid from flowing out in the opposite direction, thus achieving gas-liquid isolation. Under the action of the annular turbulence groove 11 in the turbulence section 9, the gas forms a circumferential, spiral, or multi-segment turbulent flow field along the outer wall of the membrane core, thereby generating shear force, eddies, or transient scouring effects between the outer periphery of the membrane core and the inner wall of the membrane shell, to weaken concentration polarization, reduce fouling layer accumulation, and assist the backwashing process. The connecting section 12 is fixed to the mold shell by a threaded lock or sealing structure and is not connected to the gas path, thereby preventing gas from entering the discharge area or affecting product flow.

[0030] When the external air supply stops, the one-way valve 6 automatically closes under the action of elastic reset force and air-pressure differential, preventing the backflow of residual gas in the membrane or the intrusion of ambient air. The entire system then returns to a stable filtration state without affecting the continuous operation of the liquid main flow path.

[0031] This utility model has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. This utility model is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are all within the protection scope of this utility model.

Claims

1. A membrane core assembly, comprising a hollow membrane core body (1), wherein a plurality of filter tubes (2) for filtration are arranged axially inside the membrane core body (1), characterized in that: Along the axial direction of the membrane core body (1), from top to bottom, there are a feeding section (3), a connecting section (4) and a discharging section (5). The connecting section (4) is provided with a one-way valve (6) for introducing gas on its outer periphery, and the one-way valve (6) is arranged around the connecting section (4). An air inlet (7) communicating with a one-way valve (6) is provided on the side wall of the connecting section (4). The connecting section (4) is divided into an upper air intake section (10) and a lower turbulence section (9) in the axial direction. At least two annular turbulence grooves (11) spaced apart from each other are provided on the outer side wall of the turbulence section (9) to form a segmented turbulence effect after the gas enters.

2. The membrane core assembly according to claim 1, characterized in that: The width of the connecting section (4) is greater than that of the feeding section (3), and the width of the air intake section (10) is greater than that of the turbulence section (9). The one-way valve (6) and the air inlet (7) are disposed on the air inlet (10), and an annular turbulence groove (11) is disposed on the outer wall of the turbulence part (9), and the turbulence groove (11) is located at the outlet of the one-way valve (6).

3. The membrane core assembly according to claim 2, characterized in that: The turbulence groove (11) is arranged along the outer periphery of the turbulence section (9) and has a spiral, wave-like or multi-segment distribution structure.

4. The membrane core assembly according to claim 2, characterized in that: The connecting section (4) further includes a connecting part (12), which is located below the air inlet (10). The connecting part (12) is used to connect with the mold shell by a threaded lock, and the connecting part (12) is not connected to the one-way valve (6).

5. The membrane core assembly according to claim 1, characterized in that: The filter tubes (2) have an inner diameter of 5-30 mm, and there are 4-50 tubes in total. They are evenly arranged along the circumference of the membrane core body (1).

6. The membrane core assembly according to claim 2, characterized in that: The turbulence groove (11) has a spiral structure and extends continuously around the outer wall of the turbulence section (9) for at least one turn.

7. The membrane core assembly according to claim 6, characterized in that: The depth of the turbulence groove (11) is 0.5-3mm and the width is 1-5mm.

8. The membrane core assembly according to claim 1, characterized in that: The membrane core body (1) has a modular structure, and the feeding section (3), the connecting section (4) and the discharging section (5) can be installed by threads, snaps or sealing rings.

9. The membrane core assembly according to claim 2, characterized in that: The bottom or wall of the turbulence channel (11) is provided with a number of micro-holes or openings to form secondary turbulence or guide flow.

10. A membrane separation device, characterized in that: It includes the membrane core assembly as described in any one of claims 1-9, and is connected to a liquid feed system or a backflushing gas supply device.

Images