A screen and membrane pack

Abstract

The utility model discloses a screen, including encapsulation hole and intercommunication hole, still include the encapsulation department, and the encapsulation department contains at least the hole encapsulation department of the periphery of encapsulation hole around arrangement, and the hole encapsulation department corresponds the hole of filter membrane, and the hole encapsulation department includes the convex structure of at least one side surface of screen relatively protruding, and the thickness of at least partial convex structure tends to reduce to the center direction of encapsulation hole, to form the inclined plane on the surface of convex structure, and the convex structure can be sealed with the hole periphery area of filter membrane. Because set up the hole encapsulation department with convex structure, need not set up the fluxing membrane between filter membrane and screen, avoid the problem that filter membrane's hole tightness is poor because of fluxing membrane positioning inaccuracy, and easy liquid leakage, improve the extrusion pressure that filter membrane's hole periphery received, improve the extrusion sealing strength to filter membrane's hole, guarantee filter membrane's hole periphery sealing effect, can improve the reliability of film package as a whole.

Description

Technical Field

[0001] This utility model relates to the field of filtration technology, and in particular to a screen and membrane pack. Background Technology

[0002] A membrane pack is a tangential flow filtration device, comprising a housing and several sequentially stacked inlet screens and filtrate units located within the housing. The inlet screen is a liquid inlet screen, and the filtrate unit generally includes a filter membrane and a filtrate screen. Both the inlet screen and the filtrate unit have inlet holes and filtrate holes. The inlet holes are connected to the flow channels on the inlet screen, and the filtrate holes are connected to the flow channels on the filtrate screen.

[0003] To control the flow channels, it is necessary to encapsulate the filtrate holes on the inlet screen and the inlet holes on the filtrate screen, thereby forming independent inlet and filtrate flow channels. For example, patent CN220495815U discloses an encapsulation method that typically involves pre-laying structures such as films or welding sheets on the screen, then laying a filter membrane on top, and heating to melt the films or welding sheets, thus encapsulating the periphery of the inlet and filtrate screens, as well as the inlet and filtrate holes.

[0004] When the membrane pack is in use, external pressure is required, which will subject both the screen and the filter membrane to external pressure. The film or welded sheet is generally annular, forming a structure similar to a frustum between the screen and the filter membrane. The outer edge of the frustum is roughly perpendicular to the filter membrane and the screen. This causes the stress on the filter membrane to be concentrated when the filter membrane is subjected to external pressure, which can easily lead to excessive pressure on the filter membrane and damage, affecting the service life of the membrane pack. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a screen and membrane package, which solves the problem that the filter membrane in the existing membrane package is easily damaged due to stress concentration.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A screen includes encapsulation holes and connecting holes, and further includes an encapsulation portion, wherein the encapsulation portion at least includes hole encapsulation portions disposed around the periphery of the encapsulation holes, the hole encapsulation portions corresponding to the pores of a filter membrane.

[0008] The pore encapsulation portion includes a protruding structure that protrudes from at least one side surface of the screen, and at least a portion of the thickness of the protruding structure tends to decrease in a direction away from the center of the encapsulation pore to form an inclined surface on the surface of the protruding structure, which can abut and seal against the peripheral area of ​​the pore of the filter membrane.

[0009] The screen of this invention is used in a filter membrane package. The screen can be a liquid inlet screen or a filtrate screen. The encapsulation holes and connecting holes on the screen correspond to different holes on the filter membrane. The inner wall of the encapsulation hole is sealed to prevent fluid from flowing to or from the filter membrane to the screen. Therefore, the encapsulation part of the screen includes at least a hole encapsulation part. The hole encapsulation part is arranged around the periphery of the encapsulation hole and seals the inner wall of the encapsulation hole.

[0010] The functions of the protruding structure include: 1. Serving as a physical positioning guide during the assembly of the screen and filter membrane, it guides the screen and filter membrane to align, improving assembly accuracy and efficiency, and reducing the possibility of seal failure due to misalignment; 2. The protruding structure also reduces pressure damage to the filter membrane. Without the protruding structure, the screen and filter membrane tend to adhere tightly, and the screen surface can easily compress the filter membrane, even damaging it or disrupting its microstructure. With the protruding structure, the sealing pressure on the filter membrane is concentrated on the protruding structure, allowing other areas of the filter membrane to perform its filtration function. Yes, the actual pressure it withstands is much smaller, protecting the filter membrane and maintaining its optimal performance and long service life; 3. Because the pore encapsulation part is set around the center of the encapsulation hole, and the center of the encapsulation hole basically coincides with the center of the pore of the filter membrane, when the screen and the filter membrane are in close contact, the force exerted by the pore encapsulation part on the filter membrane on the screen is directed towards the center of the pore of the filter membrane. The force exerted by the circumferentially surrounding protruding structure on the outer periphery of the pore of the filter membrane cancels each other out, so as to improve the uniformity of the force on the filter membrane and the stability of the pore of the filter membrane between the screens, and avoid the filter membrane from shifting or breaking due to uneven circumferential force.

[0011] The thickness of the protruding structure decreases towards the center of the encapsulation hole, forming an inclined surface on the surface of the protruding structure. This inclined surface can abut against the periphery of the filter membrane's pores. The inclined surface makes the contact between the protruding structure and the filter membrane a gradual process. As the clamping force increases, the contact area gradually expands from a single line, making the compression sealing process more controllable and stable. The inclined surface also makes the area of ​​the protruding structure corresponding to the edge of the filter membrane's pores thicker, thereby increasing the compressive force on the periphery of the filter membrane's pores and improving the compression sealing strength of the filter membrane's pores, ensuring the sealing effect around the filter membrane's pores. The inclined surface also makes the area of ​​the protruding structure away from the edge of the filter membrane's pores thinner, which, while continuing the sealing effect, also reduces the compressive force on the filter membrane, thereby avoiding stress concentration and filter membrane damage, and protecting the filter membrane.

[0012] In summary, the screen with the perforated sealing part of this utility model can improve the overall reliability of the film packaging.

[0013] Preferably, the inclined surface is a circular arc surface or an elliptical arc surface; the inclined surface is at least a portion of the surface of the protruding structure that abuts against the periphery of the pores of the filter membrane. The circular arc surface or elliptical arc surface can not only meet the shape requirements of the protruding structure being lower on the outer periphery and higher on the inner side, but also avoid stress concentration and damage to the filter membrane when it abuts against the periphery of the pores of the filter membrane. Even if the protruding structure is deformed by compression, it will not form sharp corners that puncture the filter membrane, thus protecting the filter membrane while meeting the compression sealing requirements.

[0014] Preferably, the absolute value of the tangent slope of the inclined surface gradually increases in the direction away from the center of the encapsulation hole, making the inclined surface curved. The closer to the center of the encapsulation hole, the gentler the inclined surface becomes. The direction of the extrusion force on the edge of the filter membrane is basically perpendicular to the surface of the filter membrane, thereby maintaining the flatness of the edge of the filter membrane, improving the extrusion sealing effect, and protecting the filter membrane.

[0015] Preferably, the thickness variation of the protruding structure is greater the further away from the center of the encapsulation hole. This arrangement ensures that the inclined surface on the protruding structure is closer to the center of the encapsulation hole, and the inclined surface is more gentle. The direction of the extrusion force on the edge of the filter membrane is basically perpendicular to the surface of the filter membrane, thereby maintaining the flatness of the edge of the filter membrane, improving the extrusion sealing effect, and protecting the filter membrane.

[0016] In some applications where screens and filter membranes are encapsulated with adhesive, the aforementioned inclined surfaces can also guide the flow of adhesive during the bonding and encapsulation of the screen and filter membrane, improving the uniformity and adhesion of the adhesive flow at the encapsulation holes on the screen. Based on the flat extrusion of the filter membrane by the inclined surfaces, regardless of whether the screen and filter membrane are subsequently connected by welding, bonding, or extrusion sealing, a more stable connection and sealing structure can be formed around the holes of the filter membrane.

[0017] Preferably, the inclined surface includes at least a portion of the inclined surface corresponding to the uniformly thickened area of ​​the protruding structure. This portion of the inclined surface can connect the hole sealing part on the screen, so that when the hole sealing part protrudes outward from the screen, it will not be too abrupt, but will protrude smoothly, avoiding interference with fluid flow and reducing the dead volume of the flow. Moreover, the uniformly thickened area is more stable during compression, improving the structural strength and stability of the protruding structure, thereby providing a better sealing effect around the pores of the filter membrane.

[0018] Preferably, the perforation sealing portion includes a first sealing portion located on the screen, a second sealing portion located in the perforation, and a third sealing portion located radially inside the second sealing portion. The inclined surface is disposed on the third sealing portion, and the second sealing portion is flush with the first sealing portion. With the above design, the perforation sealing portion extends into the sealing hole, with a relatively long radial length, forming multiple and continuous sealing barriers, reducing the probability of leakage. The first sealing portion located on the screen provides support for the second and third sealing portions, maintaining their axial position within the sealing hole, so that when they abut and seal against the periphery of the filter membrane's pores, they can resist the force of the filter membrane, preventing the second and third sealing portions from bending or collapsing. The second sealing portion connects the first and third sealing portions, and the third sealing portion is closer to the edge of the filter membrane's pores. Its inclined surface can smoothly transition and release the extrusion pressure on the edge of the filter membrane's pores, and transmit the extrusion pressure to the first sealing portion and the screen, without causing irregular deformation, thereby better protecting the filter membrane. While ensuring the extrusion sealing strength, it reduces mechanical stress damage to the filter membrane and extends the service life of the membrane pack.

[0019] Preferably, the perforation sealing part includes a first sealing part located on the screen and a second sealing part located in the perforation, with the inclined surface disposed on the second sealing part. By adopting the above design, while appropriately extending the sealing path, the force arm length of the inclined surface that abuts against the edge of the perforation of the filter membrane is reduced, making the path of the extrusion force transmitted to the first sealing part and the screen shorter, and the stability of the perforation sealing part higher, thereby achieving stable extrusion sealing of the filter membrane and improving the sealing effect.

[0020] Preferably, the hole encapsulation part includes a first encapsulation part located on the screen and a second encapsulation part located in the hole, and the inclined surface is disposed on the first encapsulation part and the second encapsulation part; the hole encapsulation part with the above structure is simpler in structure, and since the inclined surface is disposed on both the first encapsulation part and the second encapsulation part, the thickness of both is increased, the structural strength is higher, and it is easier to process; the pressure of the filter membrane on the inclined surface can be directly transmitted to the screen, so that the hole encapsulation part has higher stability, thereby improving the compression and sealing effect on the filter membrane.

[0021] Preferably, a first extrusion section is provided in the area surrounding the hole encapsulation section, the width of the first extrusion section is 0.5 to 5 mm, and the thickness of the first extrusion section is 0.9 to 0.99 times the thickness of the screen.

[0022] The first extrusion section is formed by extruding the screen using a mold during the fabrication of the orifice sealing section. The mold allows for better control of the adhesive distribution within the orifice sealing section, reducing adhesive leakage and ensuring repeatability and precision in the shape and position of the orifice sealing section. This reduces processing difficulty, improves processing quality, and lays the foundation for forming a continuous and reliable sealing line. The mold extrudes the screen, and under pressure, the adhesive is forced into the pores on the screen surface. After curing, a strong interlocking structure is formed, allowing the adhesive to bond firmly to the screen, forming a more stable orifice sealing section structure and ensuring the sealing of the orifice. The first extrusion section is formed on the screen, and after being pressed, its thickness is slightly less than that of the screen. It is located on the outer periphery of the orifice sealing section and placed in the flow channel on the screen, ensuring that the flow channel height is basically consistent and guaranteeing the predictability and stability of the fluid dynamics performance. Controlling the width of the first extrusion section reduces its occupation of the area of ​​the screen for fluid flow, ensuring the fluid flow rate of the screen.

[0023] Preferably, the encapsulation part further includes a peripheral encapsulation part surrounding the screen, the peripheral encapsulation part being integrally formed with the hole encapsulation part.

[0024] The screen and filter membrane also need to be encapsulated around their periphery to prevent fluid leakage. Similarly, the peripheral encapsulation part surrounding the screen has a similar structure to the perforation encapsulation part. It can not only seal the periphery of the screen but also abut against the periphery of the filter membrane. Likewise, since the peripheral encapsulation part can compress and seal the periphery of the filter membrane, there is no need to place a fluxing membrane between the filter membrane and the screen. This avoids the problem of poor perforation sealing of the filter membrane and easy leakage due to inaccurate positioning of the fluxing membrane. The peripheral encapsulation part can also serve as a physical positioning guide during the assembly of the screen and filter membrane, guiding the screen and filter membrane to align, improving assembly accuracy and efficiency, and reducing the possibility of sealing failure due to misalignment. At the same time, the peripheral encapsulation part and the perforation encapsulation part work together to reduce pressure damage to the filter membrane. The peripheral encapsulation part and the perforation encapsulation part are integrally formed and can be prefabricated on the screen using the same mold, optimizing the processing steps and improving processing efficiency.

[0025] Preferably, a second extrusion part is provided on the inner edge of the peripheral encapsulation part; the width of the second extrusion part is 0.5 to 5 mm, and the thickness of the second extrusion part is 0.9 to 0.99 times the thickness of the screen.

[0026] Similarly, the peripheral encapsulation part is prefabricated on the screen using thermosetting resin, rubber, or silicone, etc. The adhesive is fluid in the screen and encapsulation holes when it is not cured. Therefore, when prefabricating the peripheral encapsulation part and the hole encapsulation part, a mold is used to extrude the screen, thereby forming a second extrusion part on the inner edge of the peripheral encapsulation part. The mold extrudes the screen, and the second extrusion part is formed on the screen and placed in the flow channel on the screen. After being compressed, the thickness of the second extrusion part is slightly less than the thickness of the screen, so that the height of the flow channel is basically consistent, ensuring the predictability and stability of the fluid dynamics performance. Controlling the width of the second extrusion part reduces its occupation of the area of ​​the screen for fluid flow, ensuring the fluid flow rate of the screen.

[0027] Preferably, the hardness of the encapsulation part is 40-70 Shore A, which is medium to soft and has good elasticity. It can undergo sufficient elastic deformation under compression to form a compression seal, creating a continuous, leak-free sealing path. The encapsulation part itself has sufficient mechanical strength and tear resistance to resist fluid pressure and pressure shocks during equipment start-up and shutdown, maintaining its shape and position stability. At the same time, it can disperse pressure through its own elastic deformation, minimizing mechanical damage to the filter membrane. While achieving a seal, it protects the membrane's flux and retention performance, extending the membrane pack's service life. If the hardness of the encapsulation part is lower than 40 Shore A, although the fit is good, the mechanical strength is insufficient, making it prone to damage or displacement under long-term operating pressure, ultimately leading to seal failure. If the hardness of the encapsulation part is higher than 70 Shore A, it will be too hard, generating huge point stress when compressed with the filter membrane, easily puncturing or damaging the membrane layer.

[0028] To achieve the above objectives, the present invention also adopts the following technical solution:

[0029] A membrane package includes an inlet screen, a filter membrane, and a filtrate screen, wherein the filter membrane is sandwiched between the inlet screen and the filtrate screen, the inlet screen and the filtrate screen being the aforementioned screens, and the pore sealing portion of at least one of the inlet screen and the filtrate screen is press-sealed with the pores of the filter membrane.

[0030] This design allows the inlet screen or filtrate screen to be squeezed and sealed with the corresponding holes on the filter membrane. During assembly, the requirements for assembly are reduced, the technical requirements for operators are lowered, and the risk of sealing failure due to improper operation is reduced. The resulting membrane pack has excellent sealing performance, protects the filter membrane, reduces damage to the filter membrane caused by extrusion pressure, extends the service life of the filter membrane, ensures the normal flow rate of the filter membrane, and improves the overall reliability of the membrane pack.

[0031] Preferably, one of the liquid inlet screen and the filtrate screen is welded and sealed to the filter membrane, and the other is squeezed and sealed to the filter membrane through the encapsulation part.

[0032] Generally, a filter membrane has an inlet screen on one side and a filtrate screen on the other side. The two sides of the filter membrane are non-uniform surfaces, with one side suitable for welding and the other side suitable for extrusion sealing. Therefore, a more suitable packaging method can be selected according to the characteristics of the filter membrane, thereby improving the reliability of the membrane package.

[0033] Preferably, for the same filter membrane, the first liquid inlet hole and the first filtrate hole are distributed alternately, the second liquid inlet hole and the second filtrate hole on the liquid inlet screen are distributed alternately and correspond to the first liquid inlet hole and the first liquid inlet hole respectively; the third liquid inlet hole and the third filtrate hole on the filtrate screen are distributed alternately and correspond to the first liquid inlet hole and the first liquid inlet hole respectively.

[0034] The second filtrate hole on the inlet screen is a sealing hole, and the third inlet hole on the filtrate screen is a sealing hole.

[0035] The second filtrate hole of the inlet screen is a sealing hole with a sealing part around it. At the same time, the third inlet hole of the filtrate screen is a sealing hole with a sealing part around it. Thus, the filter membrane and the second filtrate hole of the inlet screen are squeezed and sealed to ensure that the filtrate will not flow back to the inlet screen through the second filtrate hole. At the same time, the filter membrane and the third inlet hole of the filtrate screen are squeezed and sealed to ensure that the feed liquid will not enter the filtrate screen through the third inlet hole and mix with the filtrate. This achieves the separation and sealing of the feed liquid flow channel and the filtrate flow channel, avoiding the mixing of feed liquid and filtrate and thus preventing filtration failure.

[0036] Preferably, the diameters of the first liquid inlet and the first filtrate hole are similar, the inner diameter of the hole encapsulation portion at the second filtrate hole is similar to the diameter of the first filtrate hole, and the inner diameter of the hole encapsulation portion at the third liquid inlet is similar to the diameter of the first liquid inlet hole; this ensures that the inner diameter of the hole encapsulation portion is consistent with the inner diameter of the hole on the filter membrane, which can squeeze and seal the edge of the hole without interfering with the fluid flow inside the hole.

[0037] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0038] The screen of this invention is used in a filter membrane package. The screen can be a liquid inlet screen or a filtrate screen. The encapsulation holes and connecting holes on the screen correspond to different holes on the filter membrane. The inner wall of the encapsulation hole is sealed to prevent fluid from flowing to or from the filter membrane to the screen. Therefore, the encapsulation part of the screen includes at least a hole encapsulation part. The hole encapsulation part is arranged around the periphery of the encapsulation hole and seals the inner wall of the encapsulation hole.

[0039] The functions of the protruding structure include: 1. Serving as a physical positioning guide during the assembly of the screen and filter membrane, it guides the screen and filter membrane to align, improving assembly accuracy and efficiency, and reducing the possibility of seal failure due to misalignment; 2. The protruding structure also reduces pressure damage to the filter membrane. Without the protruding structure, the screen and filter membrane tend to adhere tightly, and the screen surface can easily compress the filter membrane, even damaging it or disrupting its microstructure. With the protruding structure, the sealing pressure on the filter membrane is concentrated on the protruding structure, allowing other areas of the filter membrane to perform its filtration function. Yes, the actual pressure it withstands is much smaller, protecting the filter membrane and maintaining its optimal performance and long service life; 3. Because the pore encapsulation part is set around the center of the encapsulation hole, and the center of the encapsulation hole basically coincides with the center of the pore of the filter membrane, when the screen and the filter membrane are in close contact, the force exerted by the pore encapsulation part on the filter membrane on the screen is directed towards the center of the pore of the filter membrane. The force exerted by the circumferentially surrounding protruding structure on the outer periphery of the pore of the filter membrane cancels each other out, so as to improve the uniformity of the force on the filter membrane and the stability of the pore of the filter membrane between the screens, and avoid the filter membrane from shifting or breaking due to uneven circumferential force.

[0040] The thickness of the protruding structure decreases towards the center of the encapsulation hole, forming an inclined surface on the surface of the protruding structure. This inclined surface can abut against the periphery of the filter membrane's pores. The inclined surface makes the contact between the protruding structure and the filter membrane a gradual process. As the clamping force increases, the contact area gradually expands from a single line, making the compression sealing process more controllable and stable. Furthermore, the inclined surface makes the area of ​​the protruding structure corresponding to the edge of the filter membrane's pores thicker, thereby increasing the compressive force on the periphery of the filter membrane's pores, improving the compression sealing strength of the filter membrane's pores, and ensuring the sealing effect around the pores of the filter membrane.

[0041] In summary, the screen with the perforated sealing part of this utility model can improve the overall reliability of the film packaging. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the screen according to an embodiment of the present utility model;

[0044] Figure 2 The screen in Embodiment 1 of this utility model Figure 1 A cross-sectional view of point AA in the diagram;

[0045] Figure 3 The screen in Embodiment 2 of this utility model is Figure 1 A cross-sectional view of point AA in the diagram;

[0046] Figure 4 The screen in Embodiment 3 of this utility model is Figure 1 A cross-sectional view of point AA in the diagram;

[0047] Figure 5 The screen in Embodiment 4 of this utility model is Figure 1 A cross-sectional view of point AA in the diagram;

[0048] Figure 6 The screen in Embodiment 5 of this utility model is Figure 1 A cross-sectional view of point AA in the diagram;

[0049] Figure 7 This is a schematic diagram of the sieve according to Embodiment Six of this utility model;

[0050] Figure 8 The screen of Embodiment Six of this utility model is in Figure 7 A cross-sectional view of section BB in the diagram;

[0051] Figure 9 This is a schematic diagram of the exploded structure of the membrane package in Embodiment 7 of this utility model;

[0052] Figure 10 This is a partial cross-sectional schematic diagram of the membrane package in Embodiment 7 of this utility model.

[0053] Explanation of reference numerals in the attached figures

[0054] 1. Screen; 2. Encapsulation hole; 3. Connecting hole; 4. Hole encapsulation part; 41. Protruding structure; 42. Inclined surface; 43. First encapsulation part; 44. Second encapsulation part; 45. Third encapsulation part; 5. Peripheral encapsulation part; 6. First extrusion part; 7. Second extrusion part;

[0055] 10. Liquid inlet screen; 11. Second liquid inlet hole; 12. Second filtrate hole;

[0056] 20. Filter membrane; 21. First liquid inlet; 22. First filtrate outlet;

[0057] 30. Filtration screen; 31. Third liquid inlet hole; 32. Third filtrate hole. Detailed Implementation

[0058] The technical solution of this utility model 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 this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0059] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0060] In the description of this utility model, 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 utility model based on the specific circumstances.

[0061] Generally, the membrane package includes an inlet screen 10, a filtration unit located downstream of the inlet screen 10, and one or more flow channels through the inlet screen 10 and the filtration unit. The filtration unit includes a filter membrane 20 and a filtrate screen 30. The feed liquid enters from the inlet on one side of the filter membrane 20 and is guided to the inlet screen 10. The filter membrane 20 is used for fluid processing and filtering the feed liquid, while the filtrate screen 30 is used to guide the filtered filtrate. Both the inlet screen 10 and the filter unit have inlet holes and filtrate holes that maintain fluid communication with the flow channel. In order to isolate the feed liquid from the filtrate, it is necessary to seal the periphery of the filtrate holes of the inlet screen 10 and seal the periphery of the inlet of the filter unit. That is, the filtrate holes on the inlet screen 10 and the corresponding holes on the filter membrane 20 are sealed, and the inlet of the filtrate screen 30 and the corresponding holes on the filter membrane 20 are sealed, so that the feed liquid will not enter the inlet screen 10 from the filtrate holes, and the filtrate will not enter the inlet screen 10 from the filtrate holes.

[0062] Based on this, the inlet screen 10 and the filtrate screen 30 can be collectively referred to as screen 1. The holes on the inlet screen 10 and the filtrate screen 30 are divided into holes that need to be sealed and holes that are used for flow, i.e., as shown in the figure. Figure 1As shown, the screen 1 in this embodiment includes a sealing hole 2 and a connecting hole 3. The sealing part includes at least a hole sealing part 4 arranged around the periphery of the sealing hole 2. The hole sealing part 4 corresponds to the hole of the filter membrane 20. That is, the hole sealing part 4 on the liquid inlet screen 10 corresponds to the filtrate hole on the filter membrane 20, and the hole sealing part 4 on the filtrate screen 30 corresponds to the liquid inlet hole on the filter membrane 20, so as to prevent the feed liquid from entering the liquid inlet screen 10 from the filtrate hole and the filtrate from entering the liquid inlet screen 10 from the filtrate hole. Furthermore, the pore sealing portion 4 includes a protruding structure 41 that protrudes from at least one side surface of the screen 1. The protruding structure 41 can abut and seal with the periphery area of ​​the pore of the filter membrane 20. Specifically, it should be noted that on the outermost liquid inlet screen 10 of the membrane package, the pore sealing portion 4 around the sealing hole 2 forms a protruding structure 41 relative to the side surface of the liquid inlet screen 10 facing the filter membrane 20. For the liquid inlet screen 10 and the filtrate screen 30 located inside the membrane package, both sides are provided with filter membranes 20. Therefore, the pore sealing portion 4 around the sealing hole 2 forms a protruding structure 41 relative to both sides of the screen 1 facing the filter membrane 20.

[0063] Because of the hole sealing part 4 with the protruding structure 41, there is no need to place a flux film between the filter membrane 20 and the screen 1, avoiding the problem of poor hole sealing of the filter membrane 20 and easy leakage due to inaccurate positioning of the flux film; the protruding structure 41 can serve as a physical positioning guide when assembling the screen 1 and the filter membrane 20, guiding the screen 1 and the filter membrane 20 to align, improving assembly accuracy and efficiency, and reducing the possibility of sealing failure due to misalignment; at the same time, the protruding structure 41 can also reduce pressure damage to the filter membrane 20. On the one hand, without the protruding structure 41, the screen 1 is prone to being tightly attached to the filter membrane 20, and the surface of the screen 1 is prone to pressing on the filter membrane 20, even damaging the filter membrane 20 or destroying its microstructure. With the protruding structure 41, the pressure damage to the filter membrane 20 will be reduced. The sealing pressure of the filter membrane 20 is concentrated on the protruding structure 41. Other areas of the filter membrane 20 can perform the filtration function, and the actual pressure they bear is much smaller, protecting the filter membrane 20 and maintaining its optimal performance and long service life. On the other hand, since the pore encapsulation part 4 is arranged around the center of the encapsulation hole 2, and the center of the encapsulation hole 2 is basically coincident with the center of the hole of the filter membrane 20, when the screen 1 is in close contact with the filter membrane 20, the force exerted by the pore encapsulation part 4 on the filter membrane 20 is directed towards the center of the hole of the filter membrane 20. The force exerted by the circumferentially surrounding protruding structure 41 on the outer periphery of the hole of the filter membrane 20 cancels each other out, thereby improving the uniformity of the force on the filter membrane 20 and the stability of the hole of the filter membrane 20 between the screens 1, and preventing the filter membrane 20 from shifting or breaking due to uneven circumferential force.

[0064] The thickness of the protruding structure 41 decreases towards the center of the encapsulation hole 2, forming an inclined surface 42 on the surface of the protruding structure 41. The inclined surface 42 can abut against the periphery of the hole of the filter membrane 20. The inclined surface 42 makes the contact between the protruding structure 41 and the filter membrane 20 a gradual process. As the clamping force increases, the contact area gradually expands from a line, making the compression sealing process more controllable and stable. The inclined surface 42 makes the area of ​​the protruding structure 41 corresponding to the edge of the hole of the filter membrane 20 thicker, thereby increasing the extrusion force on the periphery of the hole of the filter membrane 20, improving the compression sealing strength of the hole of the filter membrane 20, and ensuring the sealing effect around the hole of the filter membrane 20. The inclined surface 42 also makes the area of ​​the protruding structure 41 away from the edge of the hole of the filter membrane 20 thinner, which can continue the sealing effect while reducing the extrusion force on the filter membrane 20, thereby avoiding stress concentration and damage to the filter membrane 20 and protecting the filter membrane 20.

[0065] The structure of the hole encapsulation part 4 varies. Several embodiments are used to briefly describe the structure of the hole encapsulation part 4 and the compression sealing method. It should be noted that... Figures 2 to 8 The dashed lines in the diagram represent the encapsulation holes covered by the encapsulation portion.

[0066] Example 1

[0067] like Figure 2 As shown, in this embodiment, the hole encapsulation part 4 includes a first encapsulation part 43 located on the screen 1, a second encapsulation part 44 located in the hole, and a third encapsulation part 45 located radially inside the second encapsulation part 44. An inclined surface 42 is disposed on the third encapsulation part 45. The second encapsulation part 44 is flush with the first encapsulation part 43. Based on this, the inner diameter of the hole formed by the hole encapsulation part 4 is smaller than the inner diameter of the encapsulation hole 2 itself. With the above design, the hole encapsulation part 4 extends into the encapsulation hole 2, with a relatively long radial length, forming multiple and continuous sealing barriers, reducing the probability of leakage. The first encapsulation part 43 located on the screen 1 provides support for the second encapsulation part 44 and the third encapsulation part 45, keeping the second encapsulation part 44 and the third encapsulation part 45 in place. The axial position within the encapsulation hole 2 allows it to abut and seal against the periphery of the filter membrane 20, resisting the force of the filter membrane 20 and preventing the second encapsulation part 44 and the third encapsulation part 45 from bending or collapsing. The second encapsulation part 44 connects the first encapsulation part 43 and the third encapsulation part 45. The third encapsulation part 45 is closer to the edge of the filter membrane 20's hole, and its inclined surface 42 can smoothly transition and release the extrusion pressure on the edge of the filter membrane 20's hole, and transmit the extrusion pressure to the first encapsulation part 43 and the screen 1, without causing irregular deformation, thus better protecting the filter membrane. While ensuring the extrusion sealing strength, it reduces mechanical stress damage to the filter membrane 20 and extends the service life of the membrane pack.

[0068] Meanwhile, the absolute value of the tangent slope of the inclined surface 42 gradually increases in the direction away from the center of the screen 1 hole, making the inclined surface 42 a curved surface. The closer to the center of the sealing hole 2, the gentler the inclined surface 42 becomes. With the inclined surface 42 designed in this way, when the inclined surface 42 is squeezed against the edge of the hole of the filter membrane 20, the direction of the squeezing force on the edge of the hole of the filter membrane 20 is basically perpendicular to the surface of the filter membrane 20, thereby maintaining the flatness of the edge of the hole of the filter membrane 20, improving the squeezing sealing effect, and protecting the filter membrane 20.

[0069] The inclined surface 42 can also guide the flow of adhesive during the bonding and sealing of the screen 1 and the filter membrane 20, improving the uniformity and adhesion of the adhesive flow at the sealing holes 2 on the screen 1. Based on the flat extrusion of the filter membrane 20 by the inclined surface 42, regardless of whether the screen 1 and the filter membrane 20 are subsequently connected by welding, bonding or extrusion sealing, a more stable connection and sealing structure can be formed around the holes of the filter membrane 20.

[0070] In this embodiment, the hole encapsulation part 4 is prefabricated on the screen 1 using a thermosetting resin, rubber, silicone, or other adhesive material. The adhesive is fluid within the screen 1 and the encapsulation hole 2 before curing. Therefore, during the prefabrication of the hole encapsulation part 4, a mold is used to extrude the screen 1, thereby forming the first extrusion part 6, such as... Figure 1 and Figure 2 As shown, the first extrusion part 6 is located radially outside the hole sealing part 4 and is arranged around the hole sealing part 4. The first extrusion part 6 indicates the extrusion position of the mold on the screen 1. The mold can better control the range of adhesive in the hole sealing part 4, reduce adhesive leakage, and make the shape and position of the hole sealing part 4 repeatable and accurate, reducing processing difficulty and improving processing quality, laying the foundation for forming a continuous and reliable sealing line. The mold will extrude the screen 1. Under the pressure, the adhesive will be squeezed into the pores on the surface of the screen 1. After curing, a strong interlocking structure is formed, which allows the adhesive to be firmly bonded to the screen 1, forming a more stable hole sealing part 4 structure, ensuring the sealing of the sealing hole 2 by the hole sealing part 4.

[0071] The first extrusion section 6 thus formed has a thickness of 0.9 to 0.99 times that of the screen 1, which is slightly smaller than the thickness of the screen 1. It is located on the outer periphery of the hole sealing section 4 and placed in the flow channel on the screen 1, so that the height of the flow channel is basically consistent, ensuring the predictability and stability of the fluid dynamic performance. The width of the first extrusion section 6 is controlled to be 0.5 to 5 mm to reduce its occupation of the area of ​​the screen 1 for fluid flow and ensure the fluid flow rate of the screen 1.

[0072] In other embodiments, the hole encapsulation portion 4 can also be formed by adhesive penetration or by directly pasting a thermoplastic sheet onto the corresponding area and then hot rolling it.

[0073] Example 2

[0074] like Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that the inclined surface 42 at least includes a portion of the inclined surface corresponding to the uniformly increased thickness area of ​​the protruding structure 41. This portion of the inclined surface can connect the hole sealing part 4 on the screen 1, so that when the hole sealing part 4 protrudes outward from the screen 1, it will not be too abrupt, but will protrude smoothly, avoiding interference with fluid flow and reducing the dead volume of the flow; and the uniformly increased thickness area is more stable when squeezed, improving the structural strength and stability of the protruding structure 41, thereby providing a better sealing effect around the holes of the filter membrane 20.

[0075] Preferably, the bevel does not extend to the inner edge of the hole formed by the protruding structure 41. The surface of the protruding structure 41 near the center of the encapsulation hole 2 is flat and it abuts against the edge of the hole of the filter membrane 20 in a flat seal. This can avoid stress concentration at the edge of the hole of the filter membrane 20 and damage to the filter membrane 20. The stability of the flat abutment seal is better.

[0076] Example 3

[0077] like Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that the hole sealing part 4 includes a first sealing part 43 located on the screen 1 and a second sealing part 44 located in the hole, with an inclined surface 42 disposed on the second sealing part 44. By adopting the above design, while appropriately extending the sealing path, the force arm length of the inclined surface 42 that abuts against the edge of the hole of the filter membrane 20 is reduced, making the path of the extrusion force transmitted to the first sealing part 43 and the screen 1 shorter, and the stability of the hole sealing part 4 higher, thereby achieving stable extrusion sealing of the filter membrane 20 and improving the sealing effect.

[0078] Meanwhile, the further away from the center of the encapsulation hole 2, the greater the variation in thickness of the protruding structure 41. This arrangement ensures that the inclined surface 42 on the protruding structure 41 is closer to the center of the encapsulation hole 2, and the inclined surface 42 is more gentle. The direction of the extrusion force on the edge of the filter membrane 20 is basically perpendicular to the surface of the filter membrane 20, thereby maintaining the flatness of the edge of the filter membrane 20, improving the extrusion sealing effect, and protecting the filter membrane 20. The inclined surface 42 on the protruding structure 41 can also guide the flow of adhesive when the screen 1 and the filter membrane 20 are bonded and encapsulated, improving the uniformity and adhesion of the adhesive flow at the encapsulation hole 2 on the screen 1. Based on the flat extrusion of the filter membrane 20 by the inclined surface 42, regardless of whether the screen 1 and the filter membrane 20 are subsequently connected by welding, bonding, or extrusion sealing, a more stable connection and sealing structure can be formed around the hole of the filter membrane 20.

[0079] Example 4

[0080] like Figure 5As shown, the difference between this embodiment and Embodiment 1 is that the hole encapsulation part 4 includes a first encapsulation part 43 located on the screen 1 and a second encapsulation part 44 located in the hole, with an inclined surface 42 disposed on the first encapsulation part 43 and the second encapsulation part 44. The hole encapsulation part 4 with the above structure is simpler, and since the inclined surface 42 is disposed on both the first encapsulation part 43 and the second encapsulation part 44, the thickness of both is increased, resulting in higher structural strength and easier processing. The pressure exerted by the filter membrane 20 on the inclined surface 42 can be directly transmitted to the screen 1, making the hole encapsulation part 4 more stable and thus improving the compression and sealing effect on the filter membrane 20.

[0081] Meanwhile, the inclined surface 42 is a circular arc surface or an elliptical arc surface; the inclined surface 42 is at least a part of the surface that abuts against the periphery of the holes of the filter membrane 20. The circular arc surface or elliptical arc surface can not only meet the shape requirements of the outer periphery of the protruding structure 41 being low and the inner side being high, but also avoid stress concentration and damage to the filter membrane 20 when it abuts against the periphery of the holes of the filter membrane 20. Even if the protruding structure 41 is deformed by compression, it will not form sharp corners to puncture the filter membrane 20. While meeting the compression sealing requirements, it protects the filter membrane 20. The inclined surface 42 can also guide the flow of adhesive when the screen 1 and the filter membrane 20 are bonded and sealed, improving the uniformity and adhesion of the adhesive flow at the sealing holes 2 on the screen 1. Based on the flat compression of the filter membrane 20 by the inclined surface 42, regardless of whether the screen 1 and the filter membrane 20 are subsequently connected by welding, bonding or compression sealing, a more stable connection structure and sealing structure can be formed around the holes of the filter membrane 20.

[0082] Example 5

[0083] like Figure 6 As shown, in this embodiment, based on Embodiment 1, the overall hole encapsulation portion 4 has a greater thickness, and it protrudes from the screen 1 on both surfaces. Similarly, the hole encapsulation portion 4 includes a first encapsulation portion 43 located on the screen 1, a second encapsulation portion 44 located in the hole, and a third encapsulation portion 45 located radially inward of the second encapsulation portion 44, with an inclined surface 42 disposed on the third encapsulation portion 45. In this design, the overall hole encapsulation portion 4 is thickened, making it suitable for feed liquid and filter membrane systems requiring higher flow channels.

[0084] It should be noted that in Embodiments 2, 3, and 4, the hole encapsulation portion can also be thickened as in Embodiment 5, which will not be elaborated here.

[0085] Example 6

[0086] The inlet and outlet channels of the membrane pack are precisely separated internally by various encapsulation parts 4. Simultaneously, the periphery of the membrane pack also needs to be sealed to prevent high-pressure feed leakage from the edges, filtrate loss from the edges, and potential intrusion of external contaminants. Figure 7As shown, the encapsulation unit also includes a peripheral encapsulation unit 5 surrounding the screen 1. When the screen 1 and the filter membrane 20 are assembled into a membrane package, the peripheral encapsulation unit 5 can not only seal the periphery of the screen 1, but also squeeze and seal the periphery of the filter membrane 20. Thus, the peripheral encapsulation unit 5 forms a continuous sealing ring that surrounds the entire edge of the membrane, ensuring that all fluids must flow strictly according to the designed path: the feed liquid enters from the inlet, passes through the inlet screen 10, is separated by the filter membrane 20, the filtrate enters the filtrate screen 30 and is discharged from the outlet, and the concentrate returns from the reflux port.

[0087] Similarly, due to the peripheral encapsulation part 5, which is pressed and sealed with the peripheral area of ​​the filter membrane 20, there is no need to place a fluxing membrane between the filter membrane 20 and the screen 1. This avoids the problem of poor pore sealing of the filter membrane 20 and easy leakage caused by inaccurate positioning of the fluxing membrane. The peripheral encapsulation part 5 can also serve as a physical positioning guide during the assembly of the screen 1 and the filter membrane 20, guiding the screen 1 and the filter membrane 20 to align, improving assembly accuracy and efficiency, and reducing the possibility of sealing failure due to misalignment. At the same time, the peripheral encapsulation part 5, together with the pore encapsulation part 4, can jointly reduce pressure damage to the filter membrane 20. In addition, the peripheral encapsulation part 5 can also provide support for the entire screen 1, maintaining its shape and flow channels.

[0088] As a preferred option, such as Figure 7 As shown, the peripheral encapsulation part 5 and the hole encapsulation part 4 are integrally formed, which means that the peripheral and hole encapsulation parts 4 are formed from the same material, in the same processing cycle, and in the same mold cavity. They are a continuous and seamless whole, which simplifies the production process and improves efficiency and consistency. At the same time, the integrally formed encapsulation part is like a built-in reinforcing skeleton that is tightly integrated with the screen 1. It can not only achieve sealing, but also greatly enhance the rigidity and integrity of the entire screen 1.

[0089] In this embodiment, the hole encapsulation part 4 and the peripheral encapsulation part 5 are formed by the same mold, therefore, as Figure 7 and Figure 8As shown, a first extrusion part 6 is provided on the outer periphery of the hole sealing part 4, and a second extrusion part 7 is provided on the inner edge of the peripheral sealing part 5. The first extrusion part 6 and the second extrusion part 7 are connected to each other and are formed by the extrusion of the screen 1 by the mold. The mold can better control the range of adhesive in the hole sealing part 4 and the peripheral sealing part 5, reduce adhesive leakage, and make the shape and position of the hole sealing part 4 and the peripheral sealing part 5 repeatable and accurate, reduce processing difficulty, improve processing quality, and lay the foundation for forming a continuous and reliable sealing line. The mold will extrude the screen 1. Under the pressure, the adhesive will be squeezed into the pores on the surface of the screen 1. After curing, a strong interlocking structure is formed, which allows the adhesive to be firmly bonded to the screen 1, forming a more stable hole sealing part 4 and peripheral sealing part 5, ensuring the sealing of the hole sealing part 4 to the sealing hole 2 and the peripheral sealing part 5 to the periphery of the screen 1.

[0090] The first extrusion section 6 and the second extrusion section 7 thus formed have a thickness of 0.9 to 0.99 times the thickness of the screen 1, which is slightly smaller than the thickness of the screen 1. The first extrusion section 6 and the second extrusion section 7 are placed in the flow channel on the screen 1, so that the height of the flow channel is basically the same, ensuring the predictability and stability of the fluid dynamic performance. The width of the first extrusion section 6 and the second extrusion section 7 is controlled to be 0.5 to 5 mm to reduce their occupation of the area of ​​the screen 1 for fluid flow and ensure the fluid flow rate of the screen 1.

[0091] In the above embodiments, the hardness of the encapsulation part is 40-70 Shore A, which is medium to soft and has good elasticity. It can undergo sufficient elastic deformation under compression to form a compression seal, creating a continuous and leak-free sealing path. The encapsulation part itself has sufficient mechanical strength and tear resistance to resist fluid pressure and pressure impacts during equipment start-up and shutdown, maintaining its shape and position stability. At the same time, it can disperse pressure through its own elastic deformation, minimizing mechanical damage to the filter membrane 20. While achieving a seal, it protects the membrane's flux and retention performance, extending the membrane pack's service life. If the hardness of the encapsulation part is lower than 40 Shore A, although the fit is good, the mechanical strength is insufficient, making it prone to damage or displacement under long-term operating pressure, ultimately leading to seal failure. If the hardness of the encapsulation part is higher than 70 Shore A, it will be too hard, generating huge point stress when compressed with the filter membrane 20, easily puncturing or damaging the membrane layer.

[0092] Example 7

[0093] like Figure 9 As shown, the membrane package of this embodiment includes an inlet screen 10, a filter membrane 20, and a filtrate screen 30. The filter membrane 20 is sandwiched between the inlet screen 10 and the filtrate screen 30. The inlet screen 10 and the filtrate screen 30 are the screens 1 mentioned above. The pore sealing portion 4 of at least one of the inlet screen 10 and the filtrate screen 30 is squeezed and sealed with the pores of the filter membrane 20.

[0094] To improve filtration efficiency, two filter membranes 20 and a filtrate screen 30 form a filtration unit. The filter membranes 20 are located on both sides of the filtrate screen 30. Corresponding to each filtration unit, there are two inlet screens 10, located on both sides of the filtration unit. The filtration principle is tangential flow filtration. The feed liquid enters from the inlet hole on one side of the membrane pack. Since the inlet hole of the filtration unit is blocked, the feed liquid only enters the inlet screen 10 through the inlet hole. A portion of the feed liquid, after being filtered by the filter membrane 20, permeates into the filtrate screen 30 to form filtrate, which flows out from the filtrate hole. At this point, because the filtrate hole of the inlet screen 10 is blocked, the filtrate will not re-enter the inlet screen 10. The remaining unfiltered feed liquid forms permeate, which is discharged from the inlet hole on the other side of the inlet screen 10, completing the filtration process. It is worth noting that the flow path in this embodiment does not refer to a physical flow path, but rather to the flow path of the feed liquid entering the filtrate and flowing out of the filtrate, as well as the flow path of the residual liquid. The number of flow paths is related to the number of inlet holes and filtrate holes. The liquid in the filter membrane 20 packs can flow tangentially or laterally.

[0095] To seal the liquid inlet of the filter unit and the filtrate hole of the liquid inlet screen 10, the liquid inlet screen 10 and the filtrate screen 30 each have a sealing hole 2, and the periphery of the sealing hole 2 has a hole sealing part 4. The hole sealing part 4 of at least one of the liquid inlet screen 10 and the filtrate screen 30 is squeezed and sealed with the hole of the filter membrane 20. With this configuration, the liquid inlet screen 10 or the filtrate screen 30 can be squeezed and sealed with the corresponding hole on the filter membrane 20. During assembly, the assembly requirements are reduced, the technical requirements of the operators are reduced, and the risk of sealing failure due to improper operation is reduced. The resulting membrane package has excellent sealing effect, can protect the filter membrane 20, reduce the damage to the filter membrane 20 caused by the extrusion pressure, extend the service life of the filter membrane 20, ensure the normal flow of the filter membrane 20, and improve the overall reliability of the membrane package.

[0096] Generally, the filter membrane 20 has an inlet screen 10 on one side and a filtrate screen 30 on the other side. The two sides of the filter membrane 20 are non-uniform surfaces, with one side suitable for welding and the other side suitable for compression sealing. In some other embodiments, one of the inlet screen 10 and the filtrate screen 30 is welded and sealed to the filter membrane 20, while the other is compressed and sealed to the filter membrane 20 by the encapsulation part. A more suitable encapsulation method can be selected according to the characteristics of the filter membrane 20, thereby improving the reliability of the membrane package.

[0097] And such Figure 10 As shown, in this embodiment, the two sides around the pores of the filter membrane 20 are sealed by the pore sealing portions 4 on the inlet screen 10 and the filtrate screen 30, respectively. Specifically, as shown... Figure 9As shown, for the same filter membrane 20, the first liquid inlet hole 21 and the first filtrate hole 22 are distributed alternately. The second liquid inlet hole 11 and the second filtrate hole 12 on the liquid inlet screen 10 are distributed alternately and correspond to the first liquid inlet hole 21 and the first liquid inlet hole 22, respectively. The third liquid inlet hole 31 and the third filtrate hole 32 on the filtrate screen 30 are distributed alternately and correspond to the first liquid inlet hole 21 and the first liquid inlet hole 22, respectively. The second filtrate hole 12 on the liquid inlet screen 10 is a sealing hole 2, and a hole sealing part 4 is provided around it. The filtrate screen 30 The third inlet hole 31 is a sealing hole 2, and a hole sealing part 4 is provided around it. Thus, the filter membrane 20 is squeezed and sealed with the second filtrate hole 12 of the inlet screen 10, ensuring that the filtrate will not flow back to the inlet screen 10 through the second filtrate hole 12. At the same time, the filter membrane 20 is squeezed and sealed with the third inlet hole 31 of the filtrate screen 30, ensuring that the feed liquid will not enter the filtrate screen 30 through the third inlet hole 31 and mix with the filtrate. This achieves the separation and sealing of the feed liquid flow channel and the filtrate flow channel, avoiding the mixing of the feed liquid and the filtrate, which would lead to filtration failure.

[0098] The third liquid inlet hole 31 and the hole sealing part 4 on the filtrate screen 30 are formed as follows: the third liquid inlet hole 31 and the third filtrate hole 32 on the filtrate screen 30 have been pre-processed, and then the periphery of the filtrate screen 30 and the third liquid inlet hole 31 are injection molded using a mold. After curing, a hole with the same inner diameter as the first liquid inlet hole 21 on the filter membrane 20 is punched in the colloid in the third liquid inlet hole 31.

[0099] Similarly, the second filtrate hole 12 and the hole encapsulation part 4 on the liquid inlet screen 10 are formed as follows: the second liquid inlet hole 11 and the second filtrate hole 12 on the liquid inlet screen 10 have been pre-processed, and then the periphery of the liquid inlet screen 10 and the second filtrate hole 12 are injection molded and encapsulated using a mold. After curing, a hole with the same inner diameter as the first filtrate hole 22 on the filter membrane 20 is punched in the colloid in the second filtrate hole 12.

[0100] Therefore, the diameters of the first liquid inlet hole 21 and the first liquid filter hole 22 are equivalent, the inner diameter of the hole encapsulation part 4 at the second liquid filter hole 12 is equivalent to the diameter of the first liquid filter hole 22, and the inner diameter of the hole encapsulation part 4 at the third liquid inlet hole 31 is equivalent to the diameter of the first liquid inlet hole 21; so as to ensure that the inner diameter of the hole encapsulation part 4 is consistent with the inner diameter of the hole on the filter membrane 20, which can squeeze and seal the edge of the hole and not interfere with the fluid flow inside the hole.

[0101] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A sieve, characterized in that, The filter membrane includes an encapsulation hole and a connecting hole, and also includes an encapsulation portion, wherein the encapsulation portion at least includes a hole encapsulation portion disposed around the periphery of the encapsulation hole, and the hole encapsulation portion corresponds to the pores of the filter membrane. The pore encapsulation portion includes a protruding structure that protrudes from at least one side surface of the screen, and at least a portion of the thickness of the protruding structure tends to decrease in a direction away from the center of the encapsulation pore to form an inclined surface on the surface of the protruding structure, which can abut and seal against the peripheral area of ​​the pore of the filter membrane.

2. The sieve as described in claim 1, characterized in that, The inclined surface is a circular arc surface or an elliptical arc surface; or, the absolute value of the slope of the tangent of the inclined surface gradually increases in the direction away from the center of the encapsulation hole; or, the further away from the center of the encapsulation hole, the greater the change in the thickness of the protruding structure.

3. The sieve according to claim 1, characterized in that, The inclined surface includes at least a portion of the inclined surface corresponding to the region where the thickness of the protruding structure increases uniformly.

4. The sieve as described in claim 1, characterized in that, The hole encapsulation portion includes a first encapsulation portion located on the screen, a second encapsulation portion located in the hole, and a third encapsulation portion located radially inside the second encapsulation portion. The inclined surface is disposed on the third encapsulation portion, and the second encapsulation portion is flush with the first encapsulation portion; or The hole encapsulation portion includes a first encapsulation portion located on the screen and a second encapsulation portion located in the hole, with the inclined surface disposed on the second encapsulation portion; or... The hole encapsulation part includes a first encapsulation part located on the screen and a second encapsulation part located in the hole, and the inclined surface is disposed on the first encapsulation part and the second encapsulation part.

5. A sieve according to claim 1, characterized in that, A first extrusion section is provided in the area surrounding the hole encapsulation part. The width of the first extrusion section is 0.5 to 5 mm, and the thickness of the first extrusion section is 0.9 to 0.99 times the thickness of the screen.

6. The sieve as described in any one of claims 1 to 4, characterized in that, The encapsulation part also includes a peripheral encapsulation part arranged around the screen, and the peripheral encapsulation part is integrally formed with the hole encapsulation part.

7. The sieve as described in claim 6, characterized in that, The inner edge of the peripheral encapsulation part is provided with a second extrusion part; the width of the second extrusion part is 0.5 to 5 mm, and the thickness of the second extrusion part is 0.9 to 0.99 times the thickness of the screen.

8. The sieve according to claim 1, characterized in that, The hardness of the encapsulation part is 40 to 70 Shore A.

9. A membrane package comprising an inlet screen, a filter membrane, and a filtrate screen, wherein the filter membrane is sandwiched between the inlet screen and the filtrate screen, characterized in that, The inlet screen and the filtrate screen are screens according to any one of claims 1 to 8, and the pore encapsulation portion of at least one of the inlet screen and the filtrate screen is squeezed and sealed with the pores of the filter membrane.

10. The membrane package as described in claim 9, characterized in that, One of the liquid inlet screen and the filtrate screen is welded and sealed to the filter membrane, while the other is squeezed and sealed to the filter membrane through the encapsulation part.

11. The membrane package as described in claim 9, characterized in that, For the same filter membrane, the first liquid inlet hole and the first filtrate hole are distributed alternately, the second liquid inlet hole and the second filtrate hole on the liquid inlet screen are distributed alternately and correspond to the first liquid inlet hole and the first liquid inlet hole respectively; the third liquid inlet hole and the third filtrate hole on the filtrate screen are distributed alternately and correspond to the first liquid inlet hole and the first liquid inlet hole respectively. The second filtrate hole on the inlet screen is a sealing hole, and the third inlet hole on the filtrate screen is a sealing hole.

12. The membrane package as described in claim 11, characterized in that, The diameters of the first liquid inlet and the first liquid filter are equivalent, the inner diameter of the hole encapsulation part at the second liquid filter is equivalent to the diameter of the first liquid filter, and the inner diameter of the hole encapsulation part at the third liquid inlet is equivalent to the diameter of the first liquid inlet.

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