Buffer type filtering membrane bag

Abstract

The utility model discloses a buffer type filter membrane bag, which comprises a main body structure and a cover plate at least arranged on one side of the main body structure, the main body structure comprises a filter membrane and a screen mesh which are arranged at intervals, the screen mesh is provided with a sealing hole and a circulation hole, the cover plate is provided with a sealing ring which is correspondingly sealed with the sealing hole and the circulation hole, and the sealing ring is provided with a sealing hole. At least one buffer layer is arranged between the main body structure and the cover plate, and the buffer layer abuts against the sealing ring of the cover plate. The utility model aims to effectively disperse the extrusion force by arranging the buffer layer, improve the circulation effect between the screen and the circulation holes, and ensure the filtering efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of filter filtration, and particularly relates to a buffer type filter membrane package. Background Art

[0002] As a most common tangential flow filtration device, a filter membrane package forms a main structure by stacking a screen and a filter membrane at intervals, and a cover plate is arranged outside the main structure for sealing. In the prior art, the outside of the filter membrane package is generally set as a screen, and usually the screen is an inlet screen or an outlet screen. Corresponding flow holes and sealing holes are arranged on the screen, and the sealing holes are usually formed by welding with a sealing layer or curing with glue. The material of the cover plate is generally hard, and it is difficult to ensure a sealed connection with the adjacent screen. In order to prevent this situation, a sealing ring is usually arranged on the cover plate, and the sealing holes and flow holes are sealed by extrusion sealing to prevent cross-flow.

[0003] When the sealing holes and flow holes are sealed by the sealing ring, since the outer periphery of the sealing holes is bonded by welding or glue curing and the material is hard, good sealing can be formed after extrusion. However, the flow holes are cut by themselves, and there are breaks at the edges of the screen wires of the flow holes. After extrusion, wire drawing is likely to occur, which will affect the flow effect between the flow holes and the screen and the filtration efficiency. Summary of the Utility Model

[0004] The utility model provides a buffer type filter membrane package, which effectively disperses the extrusion pressure by arranging a buffer layer, improves the flow effect between the screen and the flow holes, and ensures the filtration efficiency.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A buffer type filter membrane package includes a main structure and a cover plate arranged on at least one side of the main structure. The main structure includes a filter membrane and a screen arranged at intervals. The screen is provided with sealing holes and flow holes. The cover plate is provided with a sealing ring corresponding to the positions of the sealing holes and the flow holes for sealing. At least one buffer layer is arranged between the main structure and the cover plate, and the buffer layer abuts against the sealing ring of the cover plate. The buffer layer is located between the main structure and the cover plate, avoiding the direct abutment of the sealing ring of the cover plate and the screen, which affects the structural stability of the screen at the flow holes and the flux effect of the fluid. By contacting the buffer layer and the sealing ring, the extrusion pressure can be effectively dispersed, and the flow capacity when the liquid flows through the screen and the flow holes can be increased, which is beneficial to ensuring the filtration efficiency of the filter membrane package.

[0007] Preferably, the buffer layer is fixedly connected to the outer peripheral area of the sealing hole of the main structure. In this way, the positioning of the buffer layer and the outer peripheral area of the sealing hole of the main structure is stable and reliable, effectively preventing relative displacement between the buffer layer and the main structure, and improving the sealing effect at the connection.

[0008] Preferably, when the number of the buffer layers is greater than or equal to two, the areas corresponding to the outer periphery of the sealing holes of adjacent buffer layers are fixedly connected to each other. The setting of multiple buffer layers can further improve the buffering performance, thereby further improving the flow effect between the screen and the flow holes.

[0009] Preferably, the buffer layer includes at least one liquid-permeable layer and / or at least one liquid-impermeable layer. The liquid-permeable layer is made of non-woven fabric. The liquid-permeable layer can serve as a flow channel for the liquid, further increasing the flow rate of the flow holes; the liquid-impermeable layer can block the liquid from flowing towards the cover plate and prevent the liquid from directly contacting the cover plate. By reasonably setting the liquid-permeable layer and / or the liquid-impermeable layer, the actual filtration requirements of the filter membrane package can be flexibly met.

[0010] Preferably, the liquid-impermeable layer is located outside the liquid-permeable layer. When the liquid-impermeable layer is arranged on the outside, the liquid-permeable layer located inside the liquid-impermeable layer can serve as a flow channel to increase the flow rate of the flow holes, and at the same time, the liquid-impermeable layer can also play a role in preventing the liquid from contacting the cover plate and improving the sealing effect.

[0011] Preferably, the liquid-permeable layer is made of non-woven fabric.

[0012] Preferably, the liquid-impermeable layer is made of a film.

[0013] Preferably, the thickness of the screen is 0.3 - 1 mm, the diameter of the mesh holes of the screen is 0.1 - 0.5 mm, and the aperture ratio of the screen is 24 - 36%; and / or, the angle between the straight wire of the screen and the long side of the screen is 70° - 100°. The structure of the screen will not affect the flow of the feed liquid and does not directly participate in the filtration of the feed liquid, avoiding affecting the stability of filtration due to the presence of the screen. Through the design of the internal angle of the screen, the feed liquid can form a turbulent flow along the flow channel of the screen, and the impurities in the feed liquid will not be blocked at a specific position, greatly improving the filtration efficiency of the filter membrane package.

[0014] Preferably, the screen includes a screen body and a seal located on the outer periphery of the screen body, and the sealing holes of the screen penetrate through the seal.

[0015] Preferably, the edge of the screen body protrudes beyond the outer periphery of the seal, and the protruding distance of the screen edge is 0.5 - 5 mm.

[0016] The beneficial effects of the present utility model are as follows: (1) At least one buffer layer is provided between the screen and the cover plate, effectively dispersing the extrusion force between the cover plate and the main structure, improving the flow effect between the screen and the flow holes, and ensuring the filtration efficiency; (2) By providing multiple buffer layers, the buffering performance and the flow effect between the screen and the flow holes can be further improved; (3) Through the structural design of the screen, the liquid material forms a turbulent flow along the flow channel of the screen, and the impurities in the liquid material will not be blocked at a specific position, enhancing the filtration efficiency of the filter membrane package; (4) By providing a liquid-permeable layer in the buffer layer, the flow rate of the flow holes is increased, and a liquid-impermeable layer is provided to prevent the liquid from directly contacting the cover plate, facilitating flexible selection according to actual requirements. Description of the Drawings

[0017] Figure 1 is the exploded sectional view of the liquid outlet of Embodiment 1 of the present utility model

[0018] Figure 2 is the sectional view of the liquid inlet and the reflux port of Embodiment 1 of the present utility model;

[0019] Figure 3 is the sectional view of the buffer layer of Embodiment 1 of the present utility model;

[0020] Figure 4 is the exploded sectional view of the liquid inlet and the reflux port of Embodiment 2 of the present utility model;

[0021] Figure 5 is the sectional view of the buffer layer of Embodiment 2 of the present utility model;

[0022] Figure 6 is the exploded sectional view of the liquid inlet and the reflux port of Embodiment 3 of the present utility model;

[0023] Figure 7 is the sectional view of the buffer layer of Embodiment 3 of the present utility model;

[0024] Figure 8 is the exploded sectional view of the liquid outlet of Embodiment 4 of the present utility model;

[0025] Figure 9 is the exploded sectional view of the liquid inlet and the reflux port of Embodiment 4 of the present utility model;

[0026] Figure 10 is the sectional view of the buffer layer of Embodiment 4 of the present utility model;

[0027] In the figure: main structure 1, liquid outlet 2, cover plate 3, sealing ring 3a, liquid inlet 4, reflux port 5, filter membrane 11, liquid outlet screen 12, liquid inlet screen 13, buffer layer 14, liquid-permeable layer 14a, liquid-impermeable layer 14b, seal 101, screen body 102. Detailed Embodiments

[0028] The following further describes the present utility model in conjunction with the attached drawings and specific embodiments.

[0029] Embodiment 1

[0030] As Figure 1 、 Figure 2 In the embodiment shown, a buffer type filter membrane package includes a main structure 1. Cover plates 3 are provided on both sides of the main structure 1. The main structure 1 and the cover plates 3 are provided with corresponding liquid inlet 4, liquid outlet 2 and return port 5. The main structure 1 includes a filter membrane 11 and a screen arranged at intervals. The thickness of the screen is 0.3 - 1 mm, the pore diameter of the screen is 0.1 - 0.5 mm, the aperture ratio of the screen is 24 - 36%, and the angle between the straight wire of the screen and the long side of the screen is 70° - 100°.

[0031] The screen is divided into a liquid inlet screen 13 and a liquid outlet screen 12. In this embodiment, the outermost side of the main structure 1 is set as the liquid outlet screen 12. The liquid outlet screen 12 includes a screen body 102 and a seal 101 located on the outer periphery of the screen body 102. The liquid inlet 4 and the return port 5 on the liquid outlet screen 12 are both pre-sealed by the seal 101 to form sealed holes. The material of the seal 101 is selected from one of PE, silica gel, epoxy resin, PA, rubber, PMMA and PP to prevent liquid from flowing through the liquid outlet screen 12 to the liquid inlet 4 and the return port 5, while the liquid outlet 2 serves as a through hole, and liquid can smoothly enter the liquid outlet 2 through the liquid outlet screen 12. During actual production, the edge of the screen body 102 protrudes from the outer periphery of the seal 101, and the protruding distance of the screen edge is 0.5 - 5 mm. Due to the existence of this protruding distance, during the sealing process of the filter membrane package, the encapsulant formed on the outer sides of the main structure 1 and the cover plates 3 can quickly penetrate into the screen edge, improving the sealing performance of the filter membrane package.

[0032] As Figure 1 、 Figure 2 shown, the cover plate 3 is provided with a sealing ring 3a corresponding to the positions of the sealed holes and the through holes for sealing. A buffer layer 14 is provided between the main structure 1 and the cover plate 3, and the buffer layer 14 abuts against the sealing ring 3a of the cover plate 3. Combining Figure 3 shown, in this embodiment, the buffer layer 14 includes a liquid permeable layer 14a, and the liquid permeable layer 14a is made of non-woven fabric. The buffer layer 14 is fixedly connected to the outer peripheral area of the sealed hole of the main structure 1, so that the positioning between the buffer layer 14 and the main structure 1 is stable and reliable, ensuring the sealing effect at the sealed hole, that is, ensuring the sealing effect of the liquid inlet 4 and the return port 5 in this embodiment. The fixed connection between the buffer layer 14 and the main structure 1 can adopt methods such as hot melt welding, ultrasonic welding, eddy current welding and glue bonding.

[0033] When the liquid material enters the main structure 1 of the filter membrane package through the liquid inlet 4, it is distributed to the filter membrane 11 through the diffusion of the liquid inlet screen 13 for filtration. Part of the liquid material that has not been filtered by the filter membrane 11 is discharged through the reflux port 5. The filtrate formed after the filtration of the filter membrane 11 flows through the liquid outlet screen 12 and converges to the liquid outlet 2 to be discharged from the membrane package. By squeezing the buffer layer 14 with the sealing ring 3a of the cover plate 3, the extrusion pressure can be effectively dispersed, and at the same time, the flow effect between the liquid outlet screen 12 and the flow holes is increased, facilitating the smooth discharge of the filtrate from the liquid outlet 2 out of the membrane package.

[0034] Example 2

[0035] The difference between Example 2 and Example 1 is that, as Figure 4 , Figure 5 shown, the buffer layer 14 of this example includes an impermeable layer 14b made of a thin film. When the liquid flows to the liquid outlet screen 12, the buffer layer 14 can block the liquid from flowing to the cover plate 3, avoiding the reaction caused by the contact between the liquid and the cover plate 3, and ensuring the sealing performance and the purity of the filtrate.

[0036] Example 3

[0037] The difference between Example 3 and Example 1 is that, as Figure 6 , Figure 7 shown, the number of buffer layers 14 is two, including a permeable layer 14a made of non-woven fabric and an impermeable layer 14b made of a thin film. The permeable layer 14a is used as a flow channel to increase the flow rate of the flow holes, that is, to increase the flow rate of the liquid outlet 2 in this example. The impermeable layer 14b is made of a thin film, and the impermeable layer 14b is located outside the permeable layer 14a, which can effectively prevent the liquid from flowing from the liquid outlet screen 12 to the cover plate 3, avoiding the direct contact between the liquid and the cover plate 3, and ensuring the sealing effect of the filter membrane package.

[0038] The buffer layer 14 is fixedly connected to the outer peripheral area of the sealing hole of the main structure 1. In this example, that is, the buffer layer 14 is fixedly connected to the outer peripheral areas of the liquid inlet 4 and the reflux port 5 of the main structure 1. At the same time, the adjacent buffer layers 14 are fixedly connected to each other in the corresponding areas of the outer periphery of the sealing hole. In this example, that is, the permeable layer 14a and the impermeable layer 14b are fixedly connected to each other in the corresponding areas of the outer periphery of the liquid inlet 4 and the reflux port 5, which can effectively ensure the sealing effect at the sealing hole. The fixed connection can be carried out by means of hot melt welding, ultrasonic welding, eddy current welding, glue bonding, etc.

[0039] Example 4

[0040] The difference between Example 4 and Example 3 is that, as Figure 8 , Figure 9 shown, in this example, the outermost side of the main structure 1 is set as the liquid inlet screen 13. Combining Figure 10As shown in the figure, the liquid inlet screen 13 includes a screen body 102 and a seal 101 located on the outer periphery of the screen body 102. The liquid outlet openings 2 on the liquid inlet screen 13 are all pre-sealed by the seal 101 to form sealed holes. The material of the seal 101 is selected from one of PE, silica gel, epoxy resin, PA, rubber, PMMA, and PP to prevent the liquid from flowing through the liquid inlet screen 13 to the liquid outlet 2 in series. The liquid inlet 4 and the reflux port 5 are used as flow-through holes, and the liquid can smoothly enter the liquid inlet 4 and the reflux port 5 through the liquid inlet screen 13.

[0041] The embodiments of the present invention have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A buffer type filter membrane package, comprising a main body structure (1) and at least a cover plate (3) disposed on one side of the main body structure (1), characterized in that, The main body structure (1) includes a filter membrane (11) and a screen arranged at intervals. The screen is provided with sealing holes and circulation holes. The cover plate (3) is provided with a sealing ring (3a) that seals corresponding to the positions of the sealing holes and the circulation holes. At least one buffer layer (14) is provided between the main body structure (1) and the cover plate (3), and the buffer layer (14) abuts against the sealing ring (3a) of the cover plate (3).

2. The buffer type filter membrane package according to claim 1, characterized in that, The buffer layer (14) is fixedly connected to the outer peripheral area of the sealing hole of the main body structure (1).

3. A buffer-type filter membrane package according to claim 1, characterized in that, When the number of the buffer layers (14) is greater than or equal to two, adjacent buffer layers (14) are fixedly connected to each other in the corresponding areas on the outer periphery of the sealing hole.

4. A buffer type filter membrane package according to claim 1, characterized in that, The buffer layer (14) includes at least one liquid-permeable layer (14a) and / or at least one liquid-impermeable layer (14b).

5. A buffer-type filter membrane package according to claim 4, characterized in that, The liquid-impermeable layer (14b) is located outside the liquid-permeable layer (14a).

6. A buffer-type filter membrane package according to claim 4 or 5, characterized in that, The liquid-permeable layer (14a) is made of non-woven fabric.

7. A buffer type filter membrane package according to claim 4 or 5, characterized in that, The liquid-impermeable layer (14b) is made of a film.

8. A buffer-type filter membrane package according to claim 1, characterized in that, The thickness of the screen is 0.3 - 1 mm, the diameter of the mesh holes of the screen is 0.1 - 0.5 mm, and the opening ratio of the screen is 24 - 36%; and / or, the included angle between the straight wire of the screen and the long side of the screen is 70° - 100°.

9. A buffer type filter membrane package according to claim 1, characterized in that, The screen includes a screen body (102) and a seal (101) located on the outer periphery of the screen body (102). The sealing holes of the screen are arranged through the seal (101).

10. A buffer-type filter membrane package according to claim 9, characterized in that, The edge of the screen body (102) protrudes beyond the outer periphery of the seal (101), and the protruding distance of the screen edge is 0.5 - 5 mm.

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