Filtering unit and filtering membrane bag

Abstract

The utility model discloses a filtering unit which comprises a liquid outlet screen and outer side layers arranged on the two side faces of the liquid outlet screen, a plurality of protruding parts are arranged at the two opposite ends of the liquid outlet screen respectively, and liquid outlets allowing liquid to flow through are formed in the protruding parts. The areas, not covered with the liquid outlet screen, of the filtering units are connected in a sealed mode to form a sealed fixing part, and the sealed fixing part of each filtering unit is provided with a liquid inlet hole and a backflow hole. According to the filtering unit and the filtering membrane bag provided by the utility model, the liquid outlet screen does not need to be provided with a liquid inlet hole and a backflow hole and does not need to be additionally blocked, so that the filtering efficiency and the sealing performance are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of filter filtration, and in particular relates to a filter unit and a filter membrane package. Background Art

[0002] The filter membrane package is the most common tangential flow filtration device, which is formed by stacking filter membranes and screens, with an inlet screen or an outlet screen provided between adjacent filter membranes. In the prior art, the screen and the filter membrane are provided with corresponding liquid inlet holes, liquid outlet holes and reflux holes. In order to prevent the original liquid of the feed liquid and the filtered filtrate from mixing and affecting the filtration effect, it is usually necessary to weld around the outlet holes of the liquid inlet screen, the inlet holes of the liquid outlet screen and the reflux holes, or use adhesives to seal the corresponding through-hole peripheries, thereby blocking specific through-holes from being connected to the screen. Since the screen itself is an uneven structure and is prone to denaturation during high-temperature welding, it is difficult to ensure uniformity in the formation of the sealing layer around the flow holes that need to be sealed. Poor fitting will also affect the sealing effect, and the sealing steps around the hole peripheries are relatively complicated and require multiple steps to ensure. Utility Model Content

[0003] The utility model provides a filtration unit and a filtration membrane package, wherein the liquid outlet screen does not require the provision of a liquid inlet hole and a reflux hole, and does not require additional blocking, thereby ensuring filtration efficiency and sealing performance.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A filter unit comprises a liquid outlet screen and outer layers disposed on both sides of the liquid outlet screen, wherein the two opposing ends of the liquid outlet screen are respectively provided with a plurality of protrusions, each provided with a liquid outlet for liquid circulation, and the filter unit is sealed in an area not covered by the liquid outlet screen to form a sealed fixed portion, wherein the filter unit is provided with a liquid inlet hole and a return hole in the sealed fixed portion. The liquid inlet hole and the return hole are disposed on the sealed fixed portion, and the liquid outlet screen does not have a liquid inlet hole and a return hole. Therefore, the filtrate channel formed on the liquid outlet screen is not connected to the liquid inlet hole and the return hole. Therefore, there is no need to dig holes in the liquid outlet screen and then seal it. Since the difficulty of sealing the sealed fixed portion is much lower than that of sealing the liquid outlet screen, the sealing of the filter unit can be ensured while ensuring filtration efficiency.

[0006] Preferably, the sealing and fixing portion further includes areas where the protruding edge of the liquid outlet screen is sealed and connected to the outer layers on both sides; alternatively, the sealing and fixing portion further includes areas where the entire outer edge of the liquid outlet screen is sealed and connected to the outer layers on both sides. In this way, the position of the liquid outlet screen is fixed within the filter unit, which helps to reduce the difficulty of subsequent assembly of the filter membrane package and further ensure the sealing of the filter unit.

[0007] Preferably, the outer layers on both sides of the liquid outlet screen are filter membranes; alternatively, one of the outer layers is a filter membrane and the other is a stop layer. By providing the outer layers on both sides of the liquid outlet screen as filter membranes or stop layers, flexible arrangement is facilitated to meet the needs of whether the filter membrane package liquid can flow or block.

[0008] Preferably, when one of the outer layers is a termination layer, a support layer is provided between the liquid outlet screen and the termination layer, and the support layer is made of non-woven fabric. The support layer can support the liquid outlet screen and provide space for the liquid to flow, thereby ensuring the stability and integrity of the filtration unit.

[0009] Preferably, a sealing layer is provided along at least a portion of the outer edge of the liquid outlet screen. The sealing layer is sealedly connected to the outer layers on either side to form the sealing fixing portion, and a bonding area is formed between the edge of the protruding portion of the liquid outlet screen and the sealing layer. The sealing layer is connected to at least a portion of the outer edge of the liquid outlet screen and is sealedly connected to the outer layers on either side, thereby ensuring a squeeze-seal effect at the sealing fixing portion, thereby ensuring the sealing performance of the filter membrane package.

[0010] Preferably, the width of the bonding area is 1-10 mm.

[0011] Preferably, the sealing layer is cured with an adhesive or welded to the outer edge of the liquid outlet screen by welding sheets to form the bonding area; and / or the thickness of the sealing layer is greater than or equal to the thickness of the liquid outlet screen.

[0012] Preferably, the protrusion of the liquid outlet screen and / or the corners of the liquid outlet screen are provided with a rounded transition, and the radius of the rounded corner is 5-15 mm.

[0013] Preferably, the sealing connection includes one of hot melt welding, ultrasonic welding, eddy current welding and glue bonding.

[0014] Preferably, the discharge screen has a thickness of 0.1-0.6 mm, a mesh diameter of 0.1-0.5 mm, a porosity of 24-36%, and / or an angle between the straight wires of the discharge screen and the long side of the discharge screen of 70°-100°. This structural design of the discharge screen allows the liquid to flow turbulently along the discharge screen, preventing impurities in the material from being clogged in a specific location, thereby improving filtration efficiency.

[0015] A filter membrane package comprises a main structure and cover plates located on both sides of the main structure, wherein the peripheries of the main structure and the cover plates are provided with rubber-coated parts, and the main structure comprises at least one liquid inlet screen and at least one filter unit.

[0016] Preferably, when the outermost portion of the main structure is a filter unit, the outer layer of the outermost filter unit adjacent to the cover plate is a termination layer, and both outer layers of the other filter units in the main structure are filter membranes. The termination layer can prevent filtrate from contacting the cover plate, thereby improving sealing performance.

[0017] The beneficial effects of the present invention are as follows: (1) the liquid outlet screen does not need to be provided with a liquid inlet hole and a return hole, so there is no need to seal the periphery of the liquid inlet hole and the return hole like the liquid outlet screen in the prior art. The sealing of the liquid inlet hole and the return hole does not need to consider the problems of uneven structure and high-temperature denaturation of the liquid outlet screen, which reduces the difficulty of sealing the liquid inlet hole and the return hole of the filter unit and improves production efficiency; (2) the liquid inlet hole and the return hole are provided on the sealing fixing part, and the liquid outlet screen will not affect the sealing of the liquid inlet hole and the return hole, which effectively improves the sealing performance of the liquid inlet hole and the return hole; (3) by providing a sealing layer on the outer side of the liquid outlet screen, the sealing performance and filtration efficiency can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional view of the filter unit of Example 1 of the present utility model;

[0019] Figure 2 This is a schematic structural diagram of the liquid outlet screen of Example 1 of the present utility model;

[0020] Figure 3 This is an exploded view of the structure of the filter membrane package of Example 1 of the present utility model;

[0021] Figure 4 This is a cross-sectional view of the filter unit of Example 2 of the present utility model;

[0022] Figure 5 This is a schematic structural diagram of the liquid outlet screen of Example 2 of the present utility model;

[0023] Figure 6 This is a cross-sectional view of the liquid outlet screen of Example 2 of the present utility model;

[0024] Figure 7 This is a cross-sectional view of the filter unit of Example 3 of the present utility model;

[0025] Figure 8 is a cross-sectional view of a filter unit according to embodiment 4 of the present invention;

[0026] In the figure: filter unit 1, outer layer 10, liquid outlet screen 11, protrusion 11a, filter membrane 12, sealing fixing part 13, bonding area 14, sealing layer 15, support layer 16, termination layer 17, liquid inlet hole 1a, reflux hole 1b, liquid outlet 1c, cover plate 2, liquid inlet screen 3. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] like Figure 1 In the embodiment shown, a filter unit includes a liquid outlet screen 11 and outer layers 10 arranged on both sides of the liquid outlet screen 11. In this embodiment, both outer layers 10 are configured as filter membranes 12. Figure 2 As shown, the two opposite ends of the liquid outlet screen 11 are respectively provided with a number of protrusions 11a, which can be formed by cutting the liquid outlet screen 11. The protrusions 11a of the liquid outlet screen 11 and the corners of the liquid outlet screen 11 are provided with rounded transitions, and the radius of the rounded corners is 5-15mm, so that the protrusions 11a and the edges of the liquid outlet screen 11 transition naturally, which facilitates the fixed connection between the liquid outlet screen 11 and the outer layer 10.

[0030] The protrusion 11a is provided with a liquid outlet 1c for liquid circulation. The filter unit 1 is sealed and connected in the area not covering the liquid outlet screen 11 to form a sealed fixed portion 13. The sealed connection includes one of heat-melt welding, ultrasonic welding, eddy current welding, and glue bonding. In this embodiment, the sealed fixed portion 13 also includes the area where the outer edge of the liquid outlet screen 11 is completely sealed and connected to the outer layer 10 on both sides. The filter unit 1 is provided with a liquid inlet hole 1a and a return hole 1b in the sealed fixed portion 13. The liquid inlet hole 1a and the return hole 1b are not provided on the liquid outlet screen 11. There is no need for additional blocking on the liquid outlet screen 11. By simply welding the filter membranes 12 in the area not covering the liquid outlet screen 11 to each other, the sealing is better guaranteed and the production efficiency is improved.

[0031] The thickness of the liquid outlet screen 11 is 0.1-0.6mm, the mesh diameter of the liquid outlet screen 11 is 0.1-0.5mm, the opening rate of the liquid outlet screen 11 is 24-36%, and the angle between the straight wire of the liquid outlet screen 11 and the long side of the liquid outlet screen 11 is 70°-100°. When the material flows in the gap between the liquid outlet screen 11 and the filter membrane 12, the structural design of the liquid outlet screen 11 can allow the material to form turbulence along the flow channel of the screen, and the impurities in the material will not be blocked at a specific position, and the filtration efficiency is greatly improved. In addition, the influence of the liquid outlet screen 11 on the material flow can be greatly reduced, and the liquid outlet screen 11 does not directly participate in the filtration of the material, avoiding the influence of the filtration stability due to the presence of the liquid outlet screen 11.

[0032] A filter membrane package, such as Figure 3As shown, the device comprises a main structure and cover plates 2 located on either side of the main structure. The periphery of the main structure and cover plates 2 can be covered with a rubber coating to form an integrated filter membrane package. The main structure includes a liquid inlet screen 3 and filter units 1 located on either side of the liquid inlet screen 3. The corresponding through-holes of the cover plate 2, liquid inlet screen 3, and filter units 1 are interconnected to form a channel for the flow of liquid, enabling the feeding, filtration, and discharge of the filtrate.

[0033] Example 2

[0034] The difference between Example 2 and Example 1 is that Figure 4 、 Figure 5 As shown, a sealing layer 15 is provided on the outer edge of the liquid outlet screen 11. The sealing layer 15 corresponds to the protrusion 11a of the liquid outlet screen 11, and the inner edge of the sealing layer 15 is adapted to the edge of the protrusion 11a of the liquid outlet screen 11. The sealing layer 15 is sealed and connected to the outer layers 10 on both sides to form a sealing and fixing portion 13. The liquid inlet 1a and the return hole 1b are arranged on the sealing and fixing portion 13. By sealing the sealing layer 15 and the filter membranes 12 on both sides, the sealing effect of the filter membrane package can be guaranteed. In this embodiment, the thickness of the sealing layer 15 is consistent with the thickness of the liquid outlet screen 11, so that the thickness of the sealing and fixing portion 13 after molding is also consistent with the thickness of the middle part of the filter unit 1, which can effectively ensure that the sealing and fixing portion 13 is subjected to sufficient extrusion force after multiple filter units 1 and the liquid inlet screen 3 are stacked, thereby ensuring the sealing effect of the liquid inlet 1a and the return hole 1b.

[0035] like Figure 5 、 Figure 6 As shown, a bonding area 14 is provided between the edge of the protruding portion 11a of the liquid outlet screen 11 and the sealing layer 15. The width of the bonding area 14 is 1-10 mm. The sealing layer 15 is cured with an adhesive or welded to the outer edge of the liquid outlet screen 11 by a welding sheet to form the bonding area 14. The bonding area 14 firmly connects the sealing layer 15 to the liquid outlet screen 11.

[0036] Example 3

[0037] The difference between Example 3 and Example 2 is that Figure 7 As shown, the thickness of the sealing layer 15 is greater than the thickness of the liquid outlet screen 11. Therefore, after the filter unit 1 is formed, the sealing layer 15 forms a certain flow gap between the liquid outlet screen 11 and the outer layer 10, which facilitates the flow of the feed liquid between the outer layer 10 and the liquid outlet screen 11, and helps to improve the filtration efficiency.

[0038] Example 4

[0039] The difference between Example 4 and Example 3 is that Figure 8As shown, one of the outer layers 10 is a filter membrane 12, and the other is a termination layer 17. When the outermost side of the filter membrane package is provided as a filter unit 1, the filter membrane 12 outside the liquid outlet screen 11 of the filter unit 1 does not actually participate in the filtration process and can therefore be replaced with a termination layer 17. Termination layer 17 is made of a liquid-impermeable material to prevent direct contact between the filtrate and the cover plate, thereby improving sealing performance. Furthermore, a support layer 16 is provided between the liquid outlet screen 11 and the termination layer 17. Support layer 16 is made of non-woven fabric to provide enhanced support for the filter unit 1.

[0040] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, based on the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A filter unit comprising a liquid outlet screen (11) and outer layers (10) arranged on both sides of the liquid outlet screen (11), characterized in that: The two opposite ends of the liquid outlet screen (11) are respectively provided with a plurality of protrusions (11a), and the protrusions (11a) are provided with liquid outlets (1c) for liquid circulation. The filter unit is sealed and connected in an area not covered by the liquid outlet screen (11) to form a sealing fixed portion (13), and the filter unit is provided with a liquid inlet hole (1a) and a return hole (1b) in the sealing fixed portion (13).

2. A filter unit according to claim 1, characterized in that: The sealing fixing portion (13) further includes a sealing connection area between the edge of the protruding portion (11a) of the liquid outlet screen (11) and the outer layers (10) on both sides; or, the sealing fixing portion (13) further includes a sealing connection area between the entire outer edge of the liquid outlet screen (11) and the outer layers (10) on both sides.

3. A filter unit according to claim 1, characterized in that: The outer layers (10) on both sides of the liquid outlet screen (11) are both filter membranes (12); or, one of the outer layers (10) is the filter membrane (12) and the other is the termination layer (17).

4. A filter unit according to claim 3, characterized in that: When one of the outer layers (10) is a termination layer (17), a support layer (16) is provided between the liquid outlet screen (11) and the termination layer (17), and the support layer (16) is made of non-woven fabric.

5. The filter unit according to claim 1, wherein: At least part of the outer edge of the liquid outlet screen (11) is provided with a sealing layer (15), the sealing layer (15) is sealed and connected to the outer layers (10) on both sides to form the sealing fixing portion (13), and a bonding area (14) is formed between the edge of the protruding portion (11a) of the liquid outlet screen (11) and the sealing layer (15).

6. A filter unit according to claim 5, characterized in that: The width of the bonding area (14) is 1-10 mm.

7. A filter unit according to claim 5, characterized in that: The sealing layer (15) is cured with an adhesive or welded to the outer edge of the liquid outlet screen (11) by a welding sheet to form the bonding area (14); And / or, the thickness of the sealing layer (15) is greater than or equal to the thickness of the liquid outlet screen (11).

8. A filter unit according to any one of claims 1 to 7, characterized in that: The protruding portion (11a) of the liquid outlet screen (11) and / or the corners of the liquid outlet screen (11) are provided with rounded corner transitions, and the radius of the rounded corners is 5-15 mm.

9. A filter unit according to any one of claims 1 to 7, characterized in that: The sealing connection includes one of hot melt welding, ultrasonic welding, eddy current welding and glue bonding.

10. A filter unit according to any one of claims 1 to 7, characterized in that: The thickness of the liquid outlet screen (11) is 0.1-0.6 mm; and / or, the mesh diameter of the liquid outlet screen (11) is 0.1-0.5 mm; and / or, the opening rate of the liquid outlet screen (11) is 24-36%; And / or, the angle between the straight wire of the liquid outlet screen (11) and the long side of the liquid outlet screen (11) is 70°-100°.

11. A filter membrane package, comprising a main structure and cover plates (2) located on both sides of the main structure, wherein the outer peripheries of the main structure and the cover plates (2) are provided with rubber coatings, wherein: The main structure comprises at least one liquid inlet screen (3) and at least one filter unit (1) according to any one of claims 1 to 10.

12. A filter membrane package according to claim 11, characterized in that: When the outermost portion of the main structure is a filter unit (1), the outer layer (10) of the outermost filter unit (1) close to the cover plate (2) is a termination layer (17), and the two outer layers (10) of the other filter units (1) in the main structure are both filter membranes (12).

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