Film bag

Abstract

The utility model relates to the technical field of filtering equipment, in particular to a membrane bag which comprises liquid inlet screens and filtrate screens which are stacked alternately, a filtering layer is arranged between any adjacent liquid inlet screen and filtrate screen, each liquid inlet screen is provided with a first packaging hole and a first communicating hole, each filtrate screen is provided with a second packaging hole and a second communicating hole, and the first packaging hole and the second communicating hole are communicated with each other. A first hole packaging part and a first peripheral packaging part are arranged on the liquid inlet screen, a second hole packaging part and a second peripheral packaging part are arranged on the filtrate screen, and at least one of the first hole packaging part and the second hole packaging part abuts against the filter layer. A vertical line is drawn from the center point of the packaging hole to the edge of the film package closest to the packaging hole, and the packaging parts are not overlapped in a 60-degree angle range formed by taking the center point of the first packaging hole as a vertex and the vertical line as an angular bisector. According to the scheme, the influence of overlapping of the packaging structure on the sealing effect is reduced, and the overall sealing performance is improved.

Description

Technical Field

[0001] The present application relates to the technical field of filtration equipment, and particularly relates to a membrane package. Background Art

[0002] A membrane package is a commonly used filtration device, and its main structure is a collection of stacked liquid inlet units and filtrate units. As Figure 1 shows the layer structure of the membrane package. Among them, the liquid inlet unit is generally a single liquid inlet screen, and the filtrate unit is generally a filtrate screen and two filter layers respectively arranged on both sides of the filtrate screen. In addition, there may be structures such as non-woven fabrics and support members between layers. The liquid inlet screen has a first encapsulation hole and a first communication hole, and the filtrate screen has a second encapsulation hole and a second communication hole. During the filtration process, the raw liquid flows and diffuses into the liquid inlet screen through the first communication hole, and passes through the filter layer during the process of flowing along the liquid inlet screen, flows into the filtrate screen, and then flows out through the second communication hole to obtain permeate, while the part that does not pass through the filter layer flows out through other first communication holes to obtain retentate or concentrate. During this process, substances to be removed in the raw liquid (such as bacteria, viruses, miscellaneous proteins or other particles) will be intercepted by the filter layer and remain in the retentate or concentrate, thereby completing the filtration or concentration step.

[0003] In order to avoid the mixing of liquids in the liquid inlet screen and the filtrate screen, it is necessary to encapsulate the first encapsulation hole and the second encapsulation hole. The patent of US20050269255A1 discloses an encapsulation structure of a membrane package, which encapsulates the first encapsulation hole and the second encapsulation hole through a sealing resin, and at the same time adjusts the encapsulation structure to achieve the effect of smooth liquid flow.

[0004] Referring to Figures 1 to 4 , in the above solution, after the actual membrane package is prepared, the projection of its encapsulation structure on the first encapsulation hole and the second encapsulation hole on the plane of the screen will be as shown by the solid line and the dotted line respectively. Among them, as Figure 3 and as shown in 4, at the positions of area A and area B, the first hole encapsulation area and the second hole encapsulation area will overlap, so its overall thickness will be greater. When the layers are sealed by abutting, since the thickness of area A and area B is relatively large, while the overall thickness of the encapsulation structure in area C is small, during the extrusion and sealing process of the membrane package, when the encapsulation structure in area C abuts against the surface of the filter layer, the encapsulation structures in area A and area B will share the pressure in area C, resulting in insufficient abutting force between the encapsulation structure and the filter layer at the position of area C. When the liquid pressure in the flow channel is too high, liquid leakage is likely to occur in area C, resulting in the mixing of the raw liquid, permeate and retentate, and affecting the filtration efficiency of the membrane package. Summary of the Utility Model

[0005] The purpose of the present application is to provide a membrane package which can maintain good sealing performance when the inner layers are connected in a butting manner.

[0006] In the technical solution of the present application, a membrane package is provided, which includes an inlet liquid screen and a filtrate screen stacked alternately. There is a filter layer between any adjacent inlet liquid screen and filtrate screen. The inlet liquid screen has a first encapsulation hole and a first communication hole, the filtrate screen has a second encapsulation hole and a second communication hole, the filter layer has an inlet hole and an outlet hole. The first encapsulation hole, the second communication hole and the outlet hole are axially aligned and communicated, and the second encapsulation hole and the first communication hole are axially aligned and communicated. On the inlet liquid screen, there is a first hole encapsulation part for realizing fluid sealing of the first encapsulation hole and a first peripheral encapsulation part for encapsulating the periphery of the inlet liquid screen. On the filtrate screen, there is a second hole encapsulation part for realizing fluid sealing of the second encapsulation hole and a second peripheral encapsulation part for encapsulating the peripheral part of the filtrate screen. At least one of the first hole encapsulation part and the second hole encapsulation part abuts against the filter layer. When the first hole encapsulation part abuts against the filter layer, a perpendicular line is drawn from the center point of the first encapsulation hole to the edge of the membrane package closest to it. Within a 60° angle formed with the perpendicular line as the angular bisector and with the center point of the first encapsulation hole as the vertex, the first hole encapsulation part and the second hole encapsulation part do not overlap within this range. When the second hole encapsulation part abuts against the filter layer, a perpendicular line is drawn from the center point of the second encapsulation hole to the edge of the membrane package closest to it. Within a 60° angle formed with the perpendicular line as the angular bisector and with the center point of the second encapsulation hole as the vertex, the first hole encapsulation part and the second hole encapsulation part do not overlap within this range.

[0007] Generally speaking, there is a relatively clear boundary between the peripheral encapsulation part and the hole encapsulation part that are not integrally arranged. In the integrally arranged hole encapsulation part and peripheral encapsulation part, it can be determined that the peripheral encapsulation part is an encapsulation structure with the same width on each side. That is, it is regarded as a strip-shaped structure extending along the frame of the membrane package and having the same width on each side. If the edge position of the first communication hole or the second communication hole directly abuts against the peripheral encapsulation part, the width of the peripheral encapsulation area is taken as the minimum straight-line distance between the communication hole and the outer side of the peripheral encapsulation part. On the two non-hole sides, the width of the peripheral encapsulation area is regarded as the width of the non-hole area. Extrusion sealing is a relatively common sealing method in membrane packages. Since its processing is simple, as long as good sealing performance can be achieved, using extrusion sealing of some structures can greatly reduce the construction cost, improve production efficiency, and have good economic effects. However, in the actual process of membrane package processing, in order to improve the sealing effect and reduce the dead flow area and other effects, there is inevitably a certain overlap between the encapsulation areas. And the overlapping area results in a relatively large thickness at this position when extruded, while when the non-overlapping area has a smaller thickness, the sealing effect of the non-overlapping area decreases. Under a relatively large pressure, it is easy to cause liquid leakage, and then the integrity of the membrane package is poor under high pressure.

[0008] In the above solution, not adopting an overlapping area is the best solution, and it is not easy to have a phenomenon of insufficient compaction near the liquid inlet hole and the liquid outlet hole, so that a good extrusion sealing effect can still be achieved under high pressure. However, since the hole encapsulation part needs to have a certain width to achieve good encapsulation, in order to make the first hole encapsulation part and the second hole encapsulation part not overlap completely, a relatively large distance is required between holes, which puts forward high requirements for the arrangement of the holes and the encapsulation structure of the membrane package. Another solution is to control the position of the overlapping area in a region far from the peripheral encapsulation area. Therefore, for any encapsulation hole, the two overlapping areas on both sides of it will have a relatively large distance, so it is not easy to generate an additional supporting effect between the two overlapping areas, resulting in difficulty in compressing the area between the overlapping areas, and then making the membrane package have a better extrusion sealing effect.

[0009] In addition, in the above solution, for the 30° angles on both sides of the vertical line, this requirement should be met in both directions of the extension of the vertical line, that is, the effect of making the two overlapping areas far apart should not only be reflected on the side close to the edge of the membrane package, but also on the side far from the edge of the membrane package.

[0010] In addition, in the above solution, when there is an elastic extrusion connection structure between the screen and the filter layer, the peripheral encapsulation part can be connected by elastic extrusion, or the layers can be extruded first and then the peripheral encapsulation part can be used to connect and fix the layers by injection molding.

[0011] In addition, during the encapsulation process, after the hole encapsulation part is formed, due to the permeability of the glue, a glue penetration structure with a thickness less than that of the hole encapsulation part may be formed outside the hole encapsulation part (especially on the side pointing to the inside of the membrane package). Since its thickness is small, it does not play a major role in sealing the hole, and a certain degree of overlap can occur in this part.

[0012] In the above solution, further preferably, when the first hole encapsulation part abuts against the filter layer, draw a vertical line from the center point of the first encapsulation hole to the nearest edge of the membrane package. Within the 120° angle formed with the vertical line as the angular bisector and the center point of the first encapsulation hole as the vertex, the first hole encapsulation part and the second hole encapsulation part do not overlap; when the second hole encapsulation part abuts against the filter layer, draw a vertical line from the center point of the second encapsulation hole to the nearest edge of the membrane package. Within the 120° angle formed with the vertical line as the angular bisector and the center point of the second encapsulation hole as the vertex, the first hole encapsulation part and the second hole encapsulation part do not overlap.

[0013] The larger the angle without an overlapping structure, the easier it is to press both sides. During the process of continuously increasing the angle in the non-overlapping area, through experiments, it can be seen that the yield rate does not increase significantly (a good product means a product without liquid leakage at the edge after pressing. Problems with the film package caused by other reasons are not counted as defective products in this solution). Until the angle reaches 120°, a yield rate of basically 100% can be achieved, and there is no liquid leakage in the area around the hole.

[0014] Preferably, there is an overlapping area between the first hole encapsulation part and the second hole encapsulation part. When the first hole encapsulation part abuts against the filter layer, the ratio of the shortest distance between the overlapping area and the first encapsulation hole to the perimeter of the first encapsulation hole is 0.05 - 0.3:1. When the second hole encapsulation part abuts against the filter layer, the ratio of the shortest distance between the overlapping area and the second encapsulation hole to the perimeter of the second encapsulation hole is 0.05 - 0.3:1.

[0015] In the above solution, the overlapping area refers to the projection of the first hole encapsulation part and the second hole encapsulation part on the plane where the filter layer is located. Considering the requirements of the film package encapsulation tightness and the pore arrangement on the film package surface, in some cases, setting an overlapping area to a certain extent helps to make full use of the space inside the film package. And in this solution, it only needs to satisfy that there is no overlapping area within a 30° angle on both sides when drawing a perpendicular line from the self-connecting hole to the edge of the film package, that is, it will not have an obvious impact on the encapsulation performance of the film package. In the above solution, for the encapsulation hole with a larger perimeter, the surrounding encapsulation area it has has a larger perimeter. Correspondingly, the overlapping area should also be farther away from its hole center area to reduce its interference with the hole edge area.

[0016] Preferably, the projections of the first hole encapsulation part and the second hole encapsulation part on the filter layer do not overlap.

[0017] The non-overlapping encapsulation area is another setting. In a larger film package structure, when there is a large distance between holes, this solution can be adopted to further improve the sealing performance.

[0018] Preferably, when the first hole encapsulation part abuts against the filter layer, the shortest distance between the second surrounding encapsulation part and the second communication hole is 1 mm. When the second hole encapsulation part abuts against the filter layer, the shortest distance between the first surrounding encapsulation part and the first communication hole is 1 mm.

[0019] In the above solution, the influence of the peripheral encapsulation part on the sealing performance of the extrusion-sealed holes is reduced. For example, when the first hole encapsulation part abuts against the filter layer in an abutting manner, it is necessary to control the second peripheral encapsulation part to be far away from the second communication hole, that is, the projection of the second encapsulation part on the filter layer has a certain distance from the projection of the first encapsulation hole on the filter layer. Furthermore, the overlapping structure of the second peripheral encapsulation part and the first peripheral encapsulation part has less influence on the first encapsulation hole, and the same is true when the filtrate screen is in an abutting manner. The above solution improves the sealing performance of the extrusion seal as a whole.

[0020] Preferably, the first encapsulation hole, the second encapsulation hole, the first communication hole, and the second communication hole are all circular. When the first hole encapsulation part abuts against the filter layer, the first hole encapsulation part at least includes a first sealing ring surrounding the edge of the first encapsulation hole. When the second hole encapsulation part abuts against the filter layer, the second hole encapsulation part at least includes a second sealing ring surrounding the edge of the second encapsulation hole.

[0021] In this solution, the annular sealing ring can achieve a better and more uniform abutting effect. It can be integrally formed with the peripheral encapsulation part, or can be additionally added around the hole after the peripheral encapsulation part is set first, or can first set the annular hole encapsulation part, and then realize the peripheral encapsulation by means of injection molding, welding, glue penetration, etc.

[0022] Preferably, the total thickness of the first hole encapsulation part and / or the second hole encapsulation part and the screen is in the ratio of 1 to 1.25:1 to the thickness of the screen itself.

[0023] In the above solution, the hole encapsulation part has a smaller thickness, and it is less likely to form a large thickness difference in the edge area of the hole encapsulation part. Therefore, in the edge area of the membrane package, the squeezing effects on both sides of the filter layer generated by the first hole encapsulation part and the second hole encapsulation part have less influence on the filter layer, making the filter layer less likely to be damaged during the pressing process and improving the integrity of the membrane package.

[0024] Preferably, the first hole encapsulation part and / or the second hole encapsulation part is a complete or partial circular ring or elliptical ring.

[0025] In the above solution, the hole encapsulation part has a more uniform stress structure around it, which can better seal the screen.

[0026] Preferably, the first hole encapsulation part abuts against the filter layer, and the second hole encapsulation part is bonded to the filter layer.

[0027] In the above solution, since the filter layer generally has more difficult-to-bond properties on the side facing the liquid inlet screen, therefore, using a highly elastic extrusion connection method on one side of the filter layer is helpful for construction convenience.

[0028] Preferably, at least a part of the first peripheral encapsulation part is attached to the outer edge of the first hole encapsulation part, and at least a part of the second peripheral encapsulation part is attached to the outer edge of the second hole encapsulation part;

[0029] and / or,

[0030] When the first hole encapsulation part abuts against the filter layer, the hardness of the first hole encapsulation part is 30 to 80 Shore D; when the first hole encapsulation part abuts against the filter layer, the hardness of the first hole encapsulation part is 30 to 80 Shore D.

[0031] In the above solution, there is a good combination between the peripheral encapsulation part and the hole encapsulation part, improving the overall sealing performance. For the hole encapsulation part connected by abutting, it is necessary to control the hardness of the encapsulation part, which can form a better extrusion sealing structure and also reduce the damage to the filter layer.

[0032] It should be noted that due to the limitations of the processing process, the overall thickness of the peripheral encapsulation part generally does not exceed the thickness of the hole encapsulation part.

[0033] In summary, the present application provides an overall structure of a membrane package. When elastic connection is adopted between layers, by adjusting the shape and positional relationship between the first encapsulation part and the second encapsulation part, the phenomenon of loose sealing or even liquid leakage caused by the overlap of the first encapsulation part and the second encapsulation part in a specific area is reduced, improving the integrity of the membrane package. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the overall structure of the membrane package in the prior art;

[0035] Figure 2 is a schematic diagram of the projection of the encapsulation structure on the liquid inlet screen and the filtrate screen in the prior art on the filter layer;

[0036] Figure 3 is Figure 2 an enlarged schematic diagram of area I in

[0037] Figure 4 is Figure 3 a schematic diagram of the structure of the A-A cross-section in

[0038] Figure 5 is a schematic diagram of the overall structure of the membrane package in Embodiment 1 of the present application;

[0039] Figure 6 is a schematic diagram of the projection of the encapsulation structure on the liquid inlet screen and the filtrate screen in Embodiment 1 of the present application on the filter layer;

[0040] Figure 7Schematic diagram of the projection of the encapsulation structure on the liquid inlet screen and the filtrate screen involved in another solution in Embodiment 1 of the present application on the filter layer;

[0041] Figure 8 Schematic diagram of the projection of the encapsulation structure on the liquid inlet screen and the filtrate screen involved in Embodiment 2 of the present application on the filter layer;

[0042] Figure 9 Schematic diagram of the projection of the encapsulation structure on the liquid inlet screen and the filtrate screen involved in Embodiment 3 of the present application on the filter layer;

[0043] Figure 10 Schematic diagram of the projection of the encapsulation structure on the liquid inlet screen and the filtrate screen involved in Embodiment 4 of the present application on the filter layer;

[0044] Figure 11 Schematic diagram of the projection of the encapsulation structure on the liquid inlet screen and the filtrate screen involved in Embodiment 5 of the present application on the filter layer.

[0045] In the figure, 1 is the liquid inlet screen; 11 is the first encapsulation hole; 12 is the first communication hole; 13 is the first hole encapsulation part; 14 is the first peripheral encapsulation part; 2 is the filtrate screen; 21 is the second encapsulation hole; 22 is the second communication hole; 23 is the second hole encapsulation part; 24 is the second peripheral encapsulation part; 3 is the filter layer; 31 is the liquid inlet hole; 32 is the liquid outlet hole; 4 is the overlapping area; 5 is the sealing ring. Detailed implementation manners

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0048] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] In this solution, the leakage points of the membrane package are detected through a smoking experiment, and the tightness of the membrane package is detected through an integrity experiment.

[0050] The integrity experiment is carried out through a gas diffusion flow test, and the specific experimental method is as follows:

[0051] The prepared filter element is wetted with water, the liquid inlet end of the element is connected to compressed air, and a pressure of 0.1 mPa is applied at the liquid inlet end. Subsequently, the gas flow rate is measured at the liquid outlet end to evaluate the integrity. The smaller the gas flow rate, the better the integrity of the filter device.

[0052] In the integrity test, if the gas flow rate is lower than 50 mL / min, it is qualified, and if it is lower than 35 mL / min, it is excellent.

[0053] Example 1. This example relates to a membrane package. Referring to Figure 5 and Figure 6 , it has an inlet liquid screen 1 and a filtrate screen 2 stacked alternately, and there is a filter layer 3 between adjacent inlet liquid screens 1 and filtrate screens 2. The inlet liquid screen 1 has a first encapsulation hole 11 and a first communication hole 12, the filtrate screen 2 has a second encapsulation hole 21 and a second communication hole 22, and the filter layer 3 has an inlet liquid hole 31 and an outlet liquid hole 32. Among them, the first encapsulation hole 11, the second communication hole 22, and the outlet liquid hole 32 are axially aligned and communicated, and the second encapsulation hole 21 and the first communication hole 12 are axially aligned and communicated. During the membrane package filtration process, the liquid flows through the first communication hole 12 into the inlet liquid screen 1 and flows along the inlet liquid screen 1. During this process, the liquid passes through the filter layer 3 under the turbulence effect of the inlet liquid screen 1 and enters one side of the filtrate screen 2, and flows out through the second communication hole 22 under the guiding effect of the filtrate screen 2.

[0054] Referring to Figure 5 and Figure 6, in the above solution, in order to encapsulate the first encapsulation hole 11 and the second encapsulation hole 21 to achieve fluid sealing between the corresponding encapsulation hole and the corresponding screen, a first hole encapsulation part 13 is provided on the first encapsulation hole 11, and a second hole encapsulation part 23 is provided on the second encapsulation hole 21. In addition, a first peripheral encapsulation part 14 is provided on the liquid inlet screen 1 for sealing the periphery of the liquid inlet screen 1, and a second peripheral encapsulation part 24 is provided on the filtrate screen 2 for sealing the periphery of the filtrate screen 2. The first peripheral encapsulation part 14 and the second peripheral encapsulation part 24 can be set by means of side glue infiltration, pre-applying a hot melt resin welding sheet, adding a thermosetting resin or a thermoplastic resin, etc. In this solution, the surface of the first hole encapsulation part 13 is flush with the surface of the liquid inlet screen 1, and the surface of the second hole encapsulation part 23 is flush with the surface of the filtrate screen 2, that is, the total thickness of the first hole encapsulation part 13 and the liquid inlet screen 1 in the area of the first hole encapsulation part 13 is close to 1:1 to the self-thickness of the liquid inlet screen 1, and the ratio of the total thickness of the second hole encapsulation part 23 and the filtrate screen 2 in the area of the second hole encapsulation part 23 to the self-thickness of the filtrate screen 2 is close to 1:1. In fact, the total thickness of the first hole encapsulation part 13 in the area of the first hole encapsulation part 13 and the total thickness of the second hole encapsulation part 23 and the filtrate screen 2 in the area of the second hole encapsulation part 23 can also be slightly thicker than the total thickness of the corresponding screen. When the range is within 1:1.25, it can better protect the filter layer 3 during the pressing process. Specifically, in this solution, the first hole encapsulation part 11 uses polyurethane glue with a hardness of 55 Shore D.

[0055] In this embodiment, the projections of the first hole encapsulation part 13, the second hole encapsulation part 23, the first peripheral encapsulation part 14, and the second peripheral encapsulation part 24 on the plane where the filter layer 3 is located are as Figure 6 shown. In Figure 6 , the solid line shows the encapsulation structure on the filtrate screen, while the dotted line shows the encapsulation structure on the liquid inlet screen. Specifically, in this embodiment, both the first hole encapsulation part 13 and the second hole encapsulation part 23 are circular rings surrounding the hole. Among them, the first hole encapsulation part 13 is hermetically connected to the filtrate screen 2 through abutting and extrusion sealing, and the second hole encapsulation part 23 bonds and seals the filtrate screen 2 and the filter layer 3 together. In this structure, in order to improve the sealing performance of the first peripheral encapsulation part 14, within the range shown by the α angle in the figure with the center of the first encapsulation hole 11 as the vertex, the projections of the first peripheral encapsulation part 14 and the second peripheral encapsulation part 24 on the filter layer 3 do not overlap, that is, Figure 6 in the angular α area, there is no stacked structure of the first peripheral encapsulation part 14 and the second peripheral encapsulation part 24, while in the area outside this area (that is, Figure 6 the area outside the angular α corresponding to each first encapsulation hole 11 in the figure), there may be a certain overlap between the first hole encapsulation part 13 and the second hole encapsulation part 23, that is, there is an overlapping area 4 in Figure 6 the figure.

[0056] By adjusting the sizes and shapes of the first hole encapsulation part 13 and the second hole encapsulation part 23, the positional relationship of the overlapping area 4 can be obtained. When other parameters are basically kept the same, by adjusting the angle of the α angle as in Figure 6 , the results shown in the following table can be obtained.

[0057]

[0058]

[0059] In the above table, the membrane areas of the prepared membrane packages are all controlled to be 0.46 m 2 . The leakage rate around the encapsulation hole refers to the probability of the appearance of smoke points in the area around the encapsulation hole during the smoking experiment.

[0060] Although during the process of the gradual reduction of the first hole encapsulation area 13, it causes the Figure 6 α angle in Figure 6 to gradually increase, and further causes it to be not easy to have leakage in the a area in Figure 6 , but an overall too small first hole encapsulation area 13 will cause the sealing reliability around the hole to decrease. Therefore, it is optimal when the α angle is 120°. When continuing to increase the range of the α angle, it is necessary to consider whether it will affect the reliability of other encapsulation structures around the hole.

[0061] Furthermore, in this solution, the diameter of the first encapsulation hole 11 is 5.2 mm, the diameter of the second encapsulation hole 21 is 11.4 mm, and the minimum distance from the overlapping area 4 to the first encapsulation hole 11 (i.e., a in the figure) is 2.1 mm. Its distance from the first encapsulation hole 11 is relatively far. Specifically, the ratio of the minimum distance from the overlapping area 4 to the first encapsulation hole 11 to the perimeter of the first encapsulation hole 11 is 0.13∶1. Therefore, it can reduce the influence of the overlapping area 4 on the first peripheral encapsulation part 14 to improve the sealing effect of the first peripheral encapsulation part 14. The first peripheral encapsulation part 14 is attached to the outer edge of the first hole encapsulation part 13, and the second peripheral encapsulation part 24 is attached to the outer edge of the second hole encapsulation part 23 to form a better support structure for the first hole encapsulation part 13 and the second hole encapsulation part 23.

[0062] It should be noted that if in the structure of this solution, the positions of each encapsulation hole and the communication hole move towards the inside of the membrane package, a structure as shown in Figure 7 can be formed. In this structure, the outer edge of the first hole encapsulation part 13 does not fit with the first peripheral encapsulation part 14, and the outer edge of the second hole encapsulation part 23 does not fit with the second peripheral encapsulation part 24. Its steps in the processing process will be more cumbersome, and problems such as insufficient firmness of the hole encapsulation and poor release of internal stress are likely to occur, and the area outside the hole cannot be fully utilized, which belongs to a worse solution compared to the solution in Embodiment 1. However, in this solution, the adoption of Figure 7The overlapping area 4 shown in [description] does not have an overlapping area 4 within a 60° angle with the center of the first encapsulation hole 11 as the vertex and the perpendicular line from the center of the first encapsulation hole 11 to the nearest edge of the liquid inlet screen 1 as the angular bisector. This setting can still achieve a better sealing effect, and the overall sealing effect is optimal when there is no overlapping area 4 within a 120° angle with the perpendicular line from the center of the first encapsulation hole 11 to the nearest edge of the liquid inlet screen 1 as the angular bisector.

[0063] Furthermore, in this solution, the first peripheral encapsulation part 14 is arranged around the periphery of the liquid inlet screen 1, and the second peripheral encapsulation part 24 is arranged around the periphery of the filtrate screen 2. Specifically, both the first peripheral encapsulation part 14 and the second peripheral encapsulation part 24 are obtained by the penetration of glue from the edge of the screen. In other solutions, the first peripheral encapsulation part 14 and the second peripheral encapsulation part 24 can also be configured by adding welding sheets or curing glue. The shortest distance between the second peripheral encapsulation part 24 and the second communication hole 22 (i.e., Figure 6 line segment b in [description]) is 4.0 mm. As long as it is not less than 1 mm, it is not easy to affect the encapsulation of the first hole encapsulation part 13.

[0064] Example 2, referring to Figure 8 , the difference from Example 1 is that the first encapsulation hole 11 and the first hole encapsulation part 13 are integrally in an oval ring shape, and the long axis direction is parallel to the direction from the side with holes of the liquid inlet screen 1 to the side with holes (i.e., Figure 8 the direction indicated by the arrow in [description]). In this solution, in order to correspond to the shape of the first encapsulation hole 11, both the second communication hole 22 and the liquid inlet hole 31 are set to be oval. In this solution, with the center of the ellipse as the fixed point, a perpendicular line is drawn from this point to the edge of the liquid inlet screen 1, and within the range of the α angle with this perpendicular line as the angular bisector, the first hole encapsulation part 13 and the second hole encapsulation part 23 do not overlap. Similar to Example 1, when the α angle increases, the overall sealing performance has an upward trend. Specifically, when the α angle is greater than 60°, it can ensure that the integrity is less than 50 mL / min, and this membrane package is usable. When the α angle reaches 120°, further increasing the α angle does not improve the integrity much.

[0065] In this solution, the perimeter of the first encapsulation hole 11 is 6.9 mm, and the shortest distance between the overlapping area 4 and the first encapsulation hole 11 (i.e., Figure 8 line segment a in [description]) is 2.1 mm, and their ratio is, which falls within the range of 0.05 - 0.3∶1.

[0066] Example 3, referring to Figure 9 , compared with Example 1, the second hole encapsulation part 23 is not bonded to the filter layer 3, but is connected and sealed by abutting.

[0067] In this solution, since both the liquid inlet screen 1 and the filtrate screen 2 are in contact with the filter layer 3, the shape of the second encapsulation part needs to be adjusted. Specifically, since the second encapsulation hole 21 is also a circular hole, its center is the center of the circle, and the second hole encapsulation part 23 is also set as a circular ring structure concentric with the second encapsulation hole 21. Within a 60° angle range (i.e., the α area in the figure) with the center of the second encapsulation hole 21 as the vertex and the perpendicular line from the center of the second encapsulation hole 21 to the edge of the nearest filtrate screen 2 as the angle bisector, the projections of the first hole encapsulation part 13 and the second hole encapsulation part 23 on the filter layer 3 do not overlap. Outside this area, the projections of the first hole encapsulation part 13 and the second hole encapsulation part 23 on the filter layer 3 overlap and form an overlapping area 4.

[0068] In this solution, the position of the overlapping area 4 is as Figure 9 shown, and its shortest distance from the projection of the first encapsulation hole 11 on the filter layer 3 (i.e., Figure 9 line segment a in the figure) is 1.1 mm, and its shortest distance from the projection of the second encapsulation hole 21 on the filter layer 3 (i.e., Figure 9 line segment b in the figure) is 1.8 mm. In addition, the shortest distance between the first peripheral encapsulation part 14 and the first communication hole 12 (i.e., Figure 9 line segment d in the figure) is 3.3 mm, and the shortest distance between the second peripheral encapsulation part 24 and the second communication hole 22 (i.e., Figure 9 line segment c in the figure) is 6.4 mm. In addition, in this solution, the second hole encapsulation part 23 can also adopt a scheme that is flush with or slightly protrudes from the filtrate screen 2, and the total thickness of the position of the second hole encapsulation part 23 should not exceed 1.1 times the thickness of the filtrate screen 2 itself.

[0069] In this solution, the first hole encapsulation part 11 is polyurethane glue with a hardness of 55 Shore D, and the second hole encapsulation part is silica gel with a hardness of 40 Shore D. Overall, as long as the hardness of the first hole encapsulation part and the second hole encapsulation part is within the range of 30 - 80 Shore D, the encapsulation effect can be achieved.

[0070] Example 4, referring to Figure 10 , on the basis of Example 3, the first hole encapsulation part 13 and the second hole encapsulation part 23 also include a sealing ring 5. The sealing ring 5 protrudes from the screen and usually has a greater thickness, which is used to tightly press the filter layer 3.

[0071] In this embodiment, although the sealing ring 5 can improve the sealing performance, during the preparation and use of the membrane package, the filter layer 3 in the area near the sealing ring 5 is easily damaged due to being squeezed in different directions, so its applicable range is small and it is only applicable to the filter layer 3 with a more solid membrane structure.

[0072] Example 5, referring to Figure 11, on the basis of Embodiment 1, the shape of the first hole encapsulation part 13 is not circular, and the specific shape is as shown in the figure.

[0073] In the adjustment of this solution, the first hole encapsulation part 13 needs to be additionally designed with dimensions to avoid the overlapping area 4. Although it can have a certain effect of reducing the dead flow zone, the non-circular or non-elliptical encapsulation structure easily causes uneven stress in all directions around the hole, and the maximum internal pressure it can withstand is small. Compared with the circular encapsulation structure shown in Embodiment 1, leakage and other phenomena are more likely to occur during extrusion.

[0074] The above embodiments are only the preferred embodiments of the present invention, and the scope of protection of the present invention cannot be limited thereby. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the scope of protection required by the present invention.

Claims

1. A membrane package, comprising an inlet sieve and a filtrate sieve stacked alternately, with a filter layer between any adjacent inlet sieve and filtrate sieve. The inlet sieve has a first encapsulation hole and a first communication hole, the filtrate sieve has a second encapsulation hole and a second communication hole, the filter layer has an inlet hole and an outlet hole. The first encapsulation hole, the second communication hole and the outlet hole are axially aligned and communicated, and the second encapsulation hole and the first communication hole are axially aligned and communicated. On the inlet sieve, there is a first hole encapsulation part for realizing fluid sealing of the first encapsulation hole and a first peripheral encapsulation part for encapsulating the periphery of the inlet sieve. On the filtrate sieve, there is a second hole encapsulation part for realizing fluid sealing of the second encapsulation hole and a second peripheral encapsulation part for encapsulating the peripheral part of the filtrate sieve, characterized in that At least one of the first hole encapsulation part and the second hole encapsulation part abuts against the filter layer. When the first hole encapsulation part abuts against the filter layer, a perpendicular line is drawn from the center point of the first encapsulation hole to the edge of the membrane package closest to it. Within a 60° angle range formed with the center point of the first encapsulation hole as the vertex and this perpendicular line as the angle bisector, the first hole encapsulation part and the second hole encapsulation part do not overlap; when the second hole encapsulation part abuts against the filter layer, a perpendicular line is drawn from the center point of the second encapsulation hole to the edge of the membrane package closest to it. Within a 60° angle range formed with the center point of the second encapsulation hole as the vertex and this perpendicular line as the angle bisector, the first hole encapsulation part and the second hole encapsulation part do not overlap.

2. A membrane package according to claim 1, characterized in that, There is an overlapping area between the first hole encapsulation part and the second hole encapsulation part. When the first hole encapsulation part abuts against the filter layer, the ratio of the shortest distance between the overlapping area and the first encapsulation hole to the perimeter of the first encapsulation hole is 0.05 - 0.3:

1. When the second hole encapsulation part abuts against the filter layer, the ratio of the shortest distance between the overlapping area and the second encapsulation hole to the perimeter of the second encapsulation hole is 0.05 - 0.3:

1.

3. A membrane package according to claim 1, characterized in that, The projections of the first hole encapsulation part and the second hole encapsulation part on the filter layer do not overlap.

4. A membrane package according to claim 2 or 3, characterized in that, When the first hole encapsulation part abuts against the filter layer, the shortest distance between the second peripheral encapsulation part and the second communication hole is 1 mm. When the second hole encapsulation part abuts against the filter layer, the shortest distance between the first peripheral encapsulation part and the first communication hole is 1 mm.

5. A membrane package according to claim 2 or 3, characterized in that, The first encapsulation hole, the second encapsulation hole, the first communication hole, and the second communication hole are all circular. When the first hole encapsulation part abuts against the filter layer, the first hole encapsulation part at least includes a first sealing ring surrounding the edge of the first encapsulation hole. When the second hole encapsulation part abuts against the filter layer, the second hole encapsulation part at least includes a second sealing ring surrounding the edge of the second encapsulation hole.

6. A membrane package according to claim 1, wherein, The total thickness of the first hole encapsulation part and / or the second hole encapsulation part and the screen is in a ratio of 1 - 1.25:1 to the thickness of the screen itself.

7. A membrane package according to claim 1, wherein The first hole encapsulation part and / or the second hole encapsulation part is a complete or partial circular ring or elliptical ring.

8. A membrane package according to claim 1, characterized in that, The first hole encapsulation part abuts against the filter layer, and the second hole encapsulation part is bonded to the filter layer.

9. A membrane package according to claim 1, characterized in that The first peripheral encapsulation part at least partially adheres to the outer edge of the first hole encapsulation part, and the second peripheral encapsulation part at least partially adheres to the outer edge of the second hole encapsulation part; and / or, When the first hole encapsulation part abuts against the filter layer, the hardness of the first hole encapsulation part is 30 - 80 Shore D.

10. A membrane package according to claim 1, characterized in that, When the first hole encapsulation part abuts against the filter layer, a perpendicular line is drawn from the center point of the first encapsulation hole to the edge of the membrane package closest to it. Within a 120° angle range formed with the center point of the first encapsulation hole as the vertex and this perpendicular line as the angle bisector, the first hole encapsulation part and the second hole encapsulation part do not overlap; when the second hole encapsulation part abuts against the filter layer, a perpendicular line is drawn from the center point of the second encapsulation hole to the edge of the membrane package closest to it. Within a 120° angle range formed with the center point of the second encapsulation hole as the vertex and this perpendicular line as the angle bisector, the first hole encapsulation part and the second hole encapsulation part do not overlap.

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