Runner assembly for membrane element

Abstract

The present invention discloses a flow channel assembly for a membrane element, the flow channel assembly comprises: a flow channel element, the flow channel element is concaved inwards to form a plurality of concave structures and is convex outwards to form a plurality of convex structures, and the plurality of concave structures and the plurality of convex structures are distributed in a staggered manner; the flow channel element comprises a water inlet section, a transition section and a water outlet section in the first direction, and the density of the multiple concave structures and the density of the multiple convex structures are gradually increased in sequence along the water inlet section, the transition section and the water outlet section. Through the gradient design that the density of the concave-convex structures of the water inlet section, the transition section and the water outlet section is gradually increased, water flow resistance at the water inlet end is reduced, pressure loss is reduced, and it is guaranteed that water flow enters rapidly and stably; the transition section realizes stable transition of water flow from a low-resistance state to a high-turbulence state and prevents the water flow from impacting the surface of the membrane; the high-density concave-convex structure at the water outlet end generates strong turbulence to effectively scour a concentration polarization layer on the surface of the membrane, low resistance and high turbulence are both considered, the scale deposition risk is reduced, and the service life of the membrane element is prolonged.

Description

Technical Field

[0001] This invention relates to the technical field of membrane water treatment, and more particularly to a flow channel assembly for membrane elements. Background Technology

[0002] In membrane water treatment, when the liquid to be treated flows over the membrane surface, the solvent (such as water) permeates through the membrane, while the solute (such as salts, colloids, etc.) is retained and accumulates near the membrane surface, forming a concentration gradient from the membrane surface to the bulk solution. This phenomenon is called "concentration polarization." Concentration polarization significantly reduces the water production efficiency of membrane elements, increases operating energy consumption, and causes sparingly soluble salts to precipitate on the membrane surface, forming scale and shortening the service life of the membrane elements.

[0003] To mitigate concentration polarization, existing technologies typically employ a flow channel mesh (commonly known as a "concentrate mesh") between membrane sheets. Traditional flow channel meshes are mostly woven or injection-molded mesh structures, primarily functioning to form flow channels and generate turbulence to agitate the boundary layer. However, this uniform flow channel mesh structure suffers from the following drawbacks: 1. Uneven pressure loss: At the inlet end of the flow channel, the fluid velocity is high and the pressure loss is large; while at the outlet end, the fluid velocity decreases and the turbulence intensity weakens as some of the fluid permeates through the membrane, resulting in a decrease in anti-fouling ability.

[0004] 2. The contradiction between anti-fouling capability and pressure loss: To achieve strong anti-fouling capability throughout the flow channel, a high-density turbulent structure needs to be designed, but this will lead to a sharp increase in pressure loss and energy consumption. If a sparser structure is used to reduce pressure loss, the anti-fouling effect at the outlet end will be poor. Summary of the Invention

[0005] In view of the aforementioned problems with existing flow channel networks, the aim is to provide a flow channel assembly for membrane elements.

[0006] The specific technical solution is as follows: A flow channel assembly for a membrane element includes: a flow channel element having a plurality of recessed structures formed inward and a plurality of protruding structures formed outward, wherein the plurality of recessed structures and the protruding structures are staggered. The flow channel element includes an inlet section, a transition section, and an outlet section along a first direction, and the density of the plurality of recessed structures and the density of the plurality of protruding structures increase sequentially along the inlet section, the transition section, and the outlet section.

[0007] Furthermore, in a preferred embodiment, the concave depth of the recessed structure is consistent with the protruding height of the convex structure.

[0008] Furthermore, as a preferred embodiment, the concave shape of the recessed structure is consistent with the convex shape of the protruding structure.

[0009] Furthermore, as a preferred embodiment, the protrusion shape of the protrusion structure is hemispherical or conical.

[0010] Furthermore, as a preferred embodiment, the flow channel element is a single plastic film structure.

[0011] Furthermore, as a preferred embodiment, the flow channel element is a one-piece molded structure.

[0012] Furthermore, as a preferred embodiment, the height of the protrusion is 0.05-0.15mm, and the bottom diameter of the protrusion structure is 0.1-0.2mm.

[0013] Furthermore, in a preferred embodiment, the lengths of the inlet section and the transition section each account for 30%-40% of the total length of the flow channel element, and the length of the outlet section accounts for 20%-30% of the total length of the flow channel element.

[0014] Furthermore, as a preferred embodiment, the density of the recessed structure and the plurality of protruding structures located in the transition section increases in the direction from the inlet section to the outlet section.

[0015] The positive effects of the above technical solution compared with the existing technology are: (1) The present invention reduces water flow resistance and pressure loss at the inlet end by using a gradient design with increasing density of concave and convex structures in the inlet, transition and outlet sections, ensuring that the water flows in quickly and smoothly; the transition section realizes a smooth transition of water flow from low resistance to high turbulence, avoiding water flow impacting the membrane surface; the high-density concave and convex structure at the outlet end generates strong turbulence, effectively scouring the concentration polarization layer on the membrane surface, reducing solute deposition, taking into account both low resistance and high turbulence, optimizing hydraulic characteristics, reducing the risk of scale deposition, and extending the life of membrane elements.

[0016] (2) The concave depth of the recessed structure of the present invention is consistent with the protrusion height of the convex structure. This ensures that the overall thickness of the flow channel element is uniform, avoids uneven water flow resistance due to local thickness differences, ensures the stability of water flow within the entire flow channel element, and improves the performance reliability of the flow channel assembly.

[0017] (3) The concave shape of the recessed structure of the present invention is consistent with the convex shape of the convex structure. This further ensures the regularity and uniformity of the flow channel element structure, which is conducive to the stable flow of water in the flow channel, reduces the water flow turbulence caused by inconsistent shapes, improves hydraulic efficiency, and enhances the inhibition effect on concentration polarization and scaling.

[0018] (4) The hemispherical or conical protrusions and corresponding concave structures of the present invention can more effectively disturb the water flow and enhance the turbulence effect. Moreover, this shape is relatively easy to form during the production and processing process, which helps to reduce production costs and improve production efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a flow channel assembly for a membrane element according to the present invention; Figure 2 This is a cross-sectional view of a flow channel assembly for a membrane element according to the present invention. Figure 3 This is a longitudinal cross-sectional view of a flow channel assembly for a membrane element according to the present invention; In the attached diagram: 1. Flow channel element; 2. Recessed structure; 3. Protruding structure; 11. Inlet section; 12. Transition section; 13. Outlet section. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Figure 1 This is a schematic diagram of a flow channel assembly for a membrane element according to the present invention; Figure 2This is a cross-sectional view of a flow channel assembly for a membrane element according to the present invention. Figure 3 This is a longitudinal cross-sectional view of a flow channel assembly for a membrane element according to the present invention, as shown below. Figure 1-3 As shown, a preferred embodiment of a flow channel assembly for a membrane element is illustrated, comprising: a flow channel element 1, wherein a plurality of recessed structures 2 are formed inward and a plurality of protruding structures 3 are formed outward on the flow channel element 1, the plurality of recessed structures 2 and the protruding structures 3 are staggered; the flow channel element 1 includes an inlet section 11, a transition section 12 and an outlet section 13 along a first direction, and the density of the plurality of recessed structures 2 and the density of the plurality of protruding structures 3 increases sequentially along the inlet section 11, the transition section 12 and the outlet section 13.

[0024] In this application, the gradient design of the inlet section 11, transition section 12, and outlet section 13 with increasing density of concave and convex structures reduces water flow resistance and pressure loss at the inlet end, ensuring rapid and stable water flow. The transition section 12 achieves a smooth transition of water flow from a low-resistance to a high-turbulence state, avoiding water flow impact on the membrane surface. The high-density concave and convex structure at the outlet end generates strong turbulence, effectively flushing the concentration polarization layer on the membrane surface, reducing solute deposition, balancing low resistance and high turbulence, optimizing hydraulic characteristics, reducing the risk of scale deposition, and extending the life of the membrane element.

[0025] Furthermore, as a preferred embodiment, the recessed depth of the concave structure 2 is consistent with the protrusion height of the convex structure 3. This ensures that the overall thickness of the flow channel element 1 is uniform, avoids uneven water flow resistance due to local thickness differences, guarantees the stability of water flow within the entire flow channel element 1, and improves the performance reliability of the flow channel assembly.

[0026] Furthermore, as a preferred embodiment, the concave shape of the recessed structure 2 is consistent with the convex shape of the convex structure 3. This further ensures the regularity and uniformity of the flow channel element 1 structure, which is beneficial to the stable flow of water within the flow channel, reduces water flow turbulence caused by inconsistent shapes, improves hydraulic efficiency, and enhances the inhibition effect on concentration polarization and scaling.

[0027] Furthermore, as a preferred embodiment, the protrusion shape of the protrusion structure 3 is hemispherical or conical. The hemispherical or conical protrusion structure 3 and the corresponding concave structure 2 can more effectively disturb the water flow and enhance the turbulence effect. Moreover, this shape is relatively easy to form during the manufacturing process, which helps to reduce production costs and improve production efficiency.

[0028] Furthermore, as a preferred embodiment, the flow channel element 1 is a single plastic film structure. This structure is simple, reducing the number of parts and assembly steps, thus lowering production costs; simultaneously, the single plastic film structure is lightweight, easy to install and replace, and improves ease of use.

[0029] Furthermore, as a preferred embodiment, the flow channel element 1 is a one-piece molded structure. The one-piece molding process eliminates seams in the flow channel element 1, avoiding problems such as water leakage or uneven local resistance that may occur due to seams. This improves the overall performance and reliability of the flow channel assembly, while also resulting in high production efficiency and low cost.

[0030] Furthermore, as a preferred embodiment, the height of the protrusion is 0.05-0.15mm, and the bottom diameter of the protrusion structure 3 is 0.1-0.2mm.

[0031] Furthermore, in a preferred embodiment, the lengths of the inlet section 11 and the transition section 12 each account for 30%-40% of the total length of the flow channel element 1, and the length of the outlet section 13 accounts for 20%-30% of the total length of the flow channel element 1.

[0032] Furthermore, as a preferred embodiment, the density of the recessed structure 2 and several protruding structures 3 located in the transition section 12 increases gradually along the direction from the inlet section 11 to the outlet section 13. This gradual density increase design allows the water flow to transition more smoothly from a low-resistance state to a high-turbulence state in the transition section 12, avoiding the impact of sudden density changes on the water flow, reducing damage to the membrane surface, and ensuring stable changes in the water flow state throughout the flow channel, thereby improving the overall performance and reliability of the flow channel assembly.

[0033] More preferably, the center-to-center distance between adjacent recessed structures 2 and raised structures 3 on the water inlet section 11 is 0.8-1.2 mm; the density of recessed and raised points is 80-150 per cm². The lower density can reduce the obstruction when water flows in, reduce the initial pressure loss, and ensure that the water flows into the membrane element channel quickly and smoothly. The transition section 12 is located between the inlet section 11 and the outlet section 13. The center-to-center distance between adjacent concave structures 2 and convex structures 3 on the transition section 12 gradually decreases from 0.8-1.2 mm in the inlet section 11 to 0.3-0.5 mm in the outlet section 13. The density of concave and convex points gradually increases from 80-150 points / cm² to 400-1100 points / cm², so as to achieve a smooth transition of water flow from low resistance to high turbulence state and avoid water flow impacting the membrane surface due to sudden density changes.

[0034] The center-to-center distance between the adjacent concave structure 2 and convex structure 3 on the outlet section 13 is 0.3-0.5 mm, and the density of concave and convex points is 400-1100 per cm². The high density of concave and convex points can generate strong turbulence in the water flow in this area, and the turbulence intensity is many times higher than that of the inlet section 11, which effectively washes away the concentration polarization layer on the membrane surface and reduces solute deposition.

[0035] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A flow channel assembly for a membrane element, characterized in that, include: A flow channel element, wherein the flow channel element has a plurality of recessed structures formed inward and a plurality of protruding structures formed outward, and the plurality of recessed structures and the plurality of protruding structures are distributed alternately. The flow channel element includes an inlet section, a transition section, and an outlet section along a first direction, and the density of the plurality of recessed structures and the density of the plurality of protruding structures increase sequentially along the inlet section, the transition section, and the outlet section.

2. The flow channel assembly for a membrane element according to claim 1, characterized in that, The concave depth of the recessed structure is consistent with the protruding height of the convex structure.

3. The flow channel assembly for a membrane element according to claim 2, characterized in that, The concave shape of the recessed structure is consistent with the convex shape of the convex structure.

4. The flow channel assembly for a membrane element according to claim 3, characterized in that, The protrusions of the protrusion structure are hemispherical or conical in shape.

5. A flow channel assembly for a membrane element according to claim 1, characterized in that, The flow channel element is a single plastic film structure.

6. A flow channel assembly for a membrane element according to claim 6, characterized in that, The flow channel element is a one-piece molded structure.

7. A flow channel assembly for a membrane element according to claim 4, characterized in that, The height of the protrusion is 0.05-0.15mm, and the bottom diameter of the protrusion structure is 0.1-0.2mm.

8. A flow channel assembly for a membrane element according to claim 1, characterized in that, The lengths of the inlet section and the transition section each account for 30%-40% of the total length of the flow channel element, and the length of the outlet section accounts for 20%-30% of the total length of the flow channel element.

9. A flow channel assembly for a membrane element according to claim 1, characterized in that, The density of the recessed structure and the plurality of protruding structures located in the transition section increases in the direction from the inlet section to the outlet section.

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