Needle head filter

Abstract

The needle filter comprises an upper shell, a lower shell, a filter membrane and a wrapping ring, the edge of the upper shell is provided with a buckle, the upper shell is clamped with the lower shell through the buckle to form a filter cavity, the filter membrane is arranged in the filter cavity, the inner side wall of the wrapping ring is provided with a sealing groove, the side walls of the upper shell and the lower shell are arranged in the sealing groove, and the upper shell and the lower shell are arranged in the sealing groove. The gap is formed in the connecting part of the upper shell and the lower shell. In the embodiment of the invention, in the process of splicing the upper shell and the lower shell to form the filter cavity, the upper shell and the lower shell can be pre-fixed through the buckling piece, so that the upper shell and the lower shell can always keep a state of clamping the filter membrane, the production difficulty of the needle filter is reduced, and the production efficiency of the needle filter is improved. And secondly, the side walls of the upper shell and the lower shell are wrapped by the wrapping ring, so that the wrapping ring can block the gap of the connecting part of the upper shell and the lower shell, and the sealing performance of the needle head filter is further improved.

Description

Technical Field

[0001] This utility model relates to the field of filtration device technology, and in particular to a needle filter. Background Technology

[0002] Needle filters, used with disposable syringes, are rapid, convenient, and reliable small-volume sample filtration devices commonly used in laboratories. They are primarily used for sample pre-filtration, sterilization filtration of laboratory biological fluids, culture media and media additives, sample preparation, and gas filtration. Jetbio needle filters are available in various sizes and membrane options for both aseptic and non-aseptic laboratory operations.

[0003] Existing syringe filters allow fluid to flow in through one conduit, where an internal filter membrane removes microorganisms and small particles without affecting the sample's composition, before the fluid flows out through another conduit. In traditional syringe filters, the filter membrane is sealed by injection-molded end caps. During this sealing process, the end caps are prone to shifting or separating, affecting the filter's sealing performance and filtration efficiency. Furthermore, due to design flaws in the upper end cap structure, the filter membrane edges are not heat-sealed. In practice, some liquid does not directly penetrate the membrane but flows out through the gap between the membrane and the filter housing. Therefore, complete filtration is sometimes not achieved, especially for high-performance sterilization pillow filters. If not completely intercepted, bacteria can continue to multiply after filtration. Utility Model Content

[0004] This invention provides a needle filter to solve the technical problem in existing needle filters where the filter membrane edge is not heat-sealed with a ring, resulting in some liquid not directly penetrating the filter membrane but flowing out through the gap between the filter membrane and the filter housing during actual operation, thus failing to achieve complete filtration. In this application, the upper and lower housings are pre-fixed by snap-fit ​​components during assembly, and then the ring is wrapped around the side walls of the upper and lower housings through an integrated injection molding process. This process not only effectively reduces the manufacturing difficulty of the needle filter but also further improves the sealing performance of the needle filter.

[0005] This application provides a needle filter, including an upper housing, a lower housing, a filter membrane, and a retaining ring. The edge of the upper housing is provided with a fastening member, and the upper housing is engaged with the lower housing through the fastening member to form a filter cavity. The filter membrane is placed in the filter cavity. The inner sidewall of the retaining ring is provided with a sealing groove, and the sidewalls of the upper housing and the lower housing are placed in the sealing groove to seal the gap at the connection between the upper housing and the lower housing.

[0006] Furthermore, in this embodiment, both the upper housing and the lower housing are provided with a retaining ring on opposite sides. When the upper housing is engaged with the lower housing through the buckle, the upper housing and the lower housing clamp the edge of the filter membrane through the retaining ring.

[0007] Furthermore, in this embodiment, the abutment ring and the buckle are spaced apart and form a filling cavity. The inner side of the ring is also provided with a filler. When the side walls of the upper housing and the lower housing are placed in the sealing groove, the filler is filled in the filling cavity.

[0008] Furthermore, in this embodiment, the filter membrane extends toward the fastener and is fixedly connected to the filler.

[0009] Furthermore, in this embodiment, the fastener is placed inside the clasp.

[0010] Furthermore, in this embodiment, the clasp is formed by one-time injection molding.

[0011] Furthermore, in this embodiment, at least two sets of the fastening members are provided on the upper housing, and the fastening members are evenly distributed on the edge of the upper housing.

[0012] Furthermore, in this embodiment, a support member is also included, which is disposed on the lower housing and is used to support the filter membrane.

[0013] Furthermore, in this embodiment, the lower housing is provided with multiple sets of support members, which are arranged radially and uniformly on the lower housing with the center of the lower housing as the center, and the support members are spaced apart from each other.

[0014] Furthermore, in this embodiment, a liquid inlet connector is also included. The liquid inlet connector is disposed on the upper housing and communicates with the filter chamber. A water-blocking element is provided at one end of the liquid inlet connector facing the lower housing, and the water-blocking element is partially connected to the edge of the end of the liquid inlet connector.

[0015] Beneficial Effects: This application is a schematic diagram of a needle filter structure, including an upper housing, a lower housing, a filter membrane, and a retaining ring. The upper housing has a snap-fit ​​element at its edge, and the upper housing engages with the lower housing via the snap-fit ​​element to form a filter chamber. The filter membrane is placed within the filter chamber. The inner sidewall of the retaining ring has a sealing groove, and the sidewalls of the upper and lower housings are placed within the sealing groove to seal the gaps at the connection between the upper and lower housings. In this embodiment, during the process of splicing the upper and lower housings to form the filter chamber, the snap-fit ​​element allows for pre-fixation of the upper and lower housings. This ensures that the upper and lower housings maintain the state of clamping the filter membrane during subsequent manufacturing processes, thereby increasing the yield rate of the needle filter and reducing the manufacturing difficulty. Furthermore, in this embodiment, the retaining ring wraps around the sidewalls of the upper and lower housings, sealing the gaps at the connection between the upper and lower housings, further improving the sealing performance of the needle filter. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of a needle filter provided in an embodiment of this application.

[0017] Figure 2 An exploded view of a needle filter provided in an embodiment of this application;

[0018] Figure 3 A cross-sectional view of a needle filter provided in an embodiment of this application;

[0019] Figure 4 For this application Figure 3 Enlarged view of part A in the middle;

[0020] Figure 5 This is a schematic diagram of the upper shell structure provided in an embodiment of this application;

[0021] Figure 6 For this application Figure 5 Enlarged view of part B in the middle section;

[0022] Figure 7 This is a schematic diagram of the lower housing structure provided in an embodiment of this application.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. Upper shell; 2. Lower shell; 3. Filter membrane; 4. Enclosing ring; 5. Supporting ring; 6. Filling cavity; 7. Fastening component; 8. Support component; 9. Water blocking component. Detailed Implementation

[0025] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0027] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0030] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0031] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0032] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0033] Needle filters, used with disposable syringes, are rapid, convenient, and reliable small-volume sample filtration devices commonly used in laboratories. They are primarily used for sample pre-filtration, sterilization filtration of laboratory biological fluids, culture media and media additives, sample preparation, and gas filtration. Jetbio needle filters are available in various sizes and membrane options for both aseptic and non-aseptic laboratory operations.

[0034] Existing syringe filters allow fluid to flow in through one conduit, where an internal filter membrane 3 removes microorganisms and small particles without affecting the sample composition, before the fluid flows out through another conduit. In traditional syringe filters, the filter membrane is sealed by injection-molded end caps. During this sealing process, the end caps are prone to shifting or separating, affecting the filter's sealing performance and filtration efficiency. Furthermore, due to design flaws in the upper end cap structure, the filter membrane edges are not heat-sealed. In actual operation, some liquid does not directly penetrate the membrane but flows out through the gap between the membrane 3 and the filter housing. Therefore, complete filtration is sometimes not achieved, especially for high-performance sterilization pillow filters. If complete interception is not achieved, bacteria can continue to multiply after filtration.

[0035] To address the technical problem in existing needle filters where the filter membrane edge is not heat-sealed with a retaining ring, resulting in some liquid not directly penetrating the filter membrane but flowing out through the gap between the filter membrane 3 and the filter housing during actual operation, thus failing to achieve complete filtration, this application provides a needle filter in which the upper housing 1 and lower housing 2 are pre-fixed by a snap fastener 7 during assembly. Then, a retaining ring 4 is wrapped around the side walls of the upper housing 1 and lower housing 2 using an integrated injection molding process. This process not only effectively reduces the manufacturing difficulty of the needle filter but also further improves its sealing performance.

[0036] Please refer to Figure 1-2 , Figure 1 The present application provides a schematic diagram and exploded view of a needle filter, including an upper housing 1, a lower housing 2, a filter membrane 3, and a retaining ring 4. The edge of the upper housing 1 is provided with a fastening member 7, and the upper housing 1 is engaged with the lower housing 2 through the fastening member 7 to form a filter chamber. The filter membrane 3 is placed in the filter chamber. The inner side wall of the retaining ring 4 is provided with a sealing groove, and the side walls of the upper housing 1 and the lower housing 2 are placed in the sealing groove to seal the gap at the connection between the upper housing 1 and the lower housing 2. In this embodiment, during the process of splicing the upper housing 1 and the lower housing 2 to form the filter chamber, the upper housing 1 and the lower housing 2 can be pre-fixed by the fastener 7. This ensures that the upper housing 1 and the lower housing 2 can always hold the filter membrane 3 during the subsequent manufacturing process, thereby increasing the yield of the needle filter and reducing the production difficulty of the needle filter. Secondly, in this embodiment, the sidewalls of the upper housing 1 and the lower housing 2 are wrapped by the retaining ring 4 so that the retaining ring 4 can seal the gap at the connection between the upper housing 1 and the lower housing 2, thereby further improving the sealing performance of the needle filter.

[0037] For further details, please refer to Figure 3 In the embodiments provided in this application, each of the upper housing 1 and the lower housing 2 is provided with a retaining ring 5 on its opposite side. When the upper housing 1 is engaged with the lower housing 2 via the snap fastener 7, the upper housing 1 and the lower housing 2 clamp the filter membrane 3 through the retaining ring 5. In this embodiment, clamping the filter membrane 3 by the retaining rings on the upper housing 1 and the lower housing 2 can increase the stability of the filter membrane 3 during use and prevent the filter membrane 3 from sliding during use, thereby improving the filtration effect of the needle filter. Secondly, in this embodiment, a buffer cavity can also be formed between the retaining ring and the lower housing 2, which can prevent the filter membrane 3 from sticking to the lower housing 2 under the action of water flow, thus affecting the filtration effect of the needle filter.

[0038] For further details, please refer to Figure 6In the embodiments provided in this application, the retaining ring 5 and the fastener 7 are spaced apart to form a filling cavity 6. A filler is also provided on the inner side of the retaining ring 4. When the side walls of the upper housing 1 and the lower housing 2 are placed in the sealing groove, the filler fills and is disposed within the filling cavity 6. In this embodiment, the filler on the retaining ring 4 tightly seals the gap between the upper housing 1 and the lower housing 2, further improving the sealing performance between the lower housing 2 and the upper housing 1.

[0039] For further details, please refer to Figure 4 In the embodiments provided in this application, the filter membrane 3 extends toward the fastener 7 and is fixedly connected to the filler. In this embodiment, fixing the edge portion of the filter membrane 3 to the filler on the clasp 4 can further enhance the stability of the filter membrane 3 in the filter cavity.

[0040] Furthermore, in the embodiments provided in this application, the buckle 7 is placed inside the wrapping ring 4. In this embodiment, the wrapping ring 4 completely wraps the side walls of the upper housing 1 and the lower housing 2, so that the wrapping ring 4 can be firmly fixed to the side walls of the upper housing 1 and the lower housing 2, thereby preventing the wrapping ring 4 from sliding and causing gaps between the wrapping ring 4 and the upper housing 1 and the lower housing 2, which would affect the sealing performance of the needle filter.

[0041] Furthermore, in the embodiments provided in this application, the clasp 4 is injection molded in one piece, and the clasp 4 is directly fixed to the side walls of the upper housing 1 and the lower housing 2 by means of one-time injection molding, which further reduces the difficulty of manufacturing the needle filter.

[0042] Specifically, after the upper shell 1 and the lower shell 2 are assembled, the assembled upper shell 1 and lower shell 2 are placed in the ring 4 mold, and molten plastic material is injected into the mold to completely fill the mold. After the molten plastic material cools and solidifies, the production of the ring 4 is completed.

[0043] For further details, please refer to Figure 5 In the embodiments provided in this application, at least two sets of fasteners 7 are provided on the upper housing 1, and the fasteners 7 are evenly arranged on the edge of the upper housing 1. By providing at least two sets of fasteners 7 on the upper housing 1, the stability of the upper housing 1 and the lower housing 2 when pre-fixed by the fasteners 7 is improved.

[0044] For further details, please refer to Figure 7 In the embodiments provided in this application, a support member 8 is also included. The support member 8 is disposed on the lower housing 2 and is used to support the filter membrane 3. By providing the support member 8 on the lower housing 2, structural support can be provided for the filter membrane 3, so that the filter membrane 3 can maintain its shape and stability when subjected to fluid pressure, and prevent the filter membrane 3 from collapsing or being damaged due to pressure.

[0045] For further details, please refer to Figure 7 In the embodiments provided in this application, the lower housing 2 is provided with multiple sets of support members 8. The multiple sets of support members 8 are arranged radially and evenly on the lower housing 2 with the center of the lower housing 2 as the center, and the two adjacent support members 8 are spaced apart. In this embodiment, by providing multiple sets of support members 8 on the lower housing 2, the filter membrane 3 is provided with higher structural support, so that the filter membrane 3 maintains its shape and stability when subjected to fluid pressure.

[0046] Secondly, in this embodiment, the multiple sets of support members 8 provided on the lower housing 2 form multiple circumferentially distributed annular flow channels and radial guide grooves on the surface of the lower housing 2, so that the filtered liquid can converge and be guided to the liquid outlet of the lower housing 2.

[0047] For further details, please refer to Figure 5 In the embodiments provided in this application, a liquid inlet connector is also included. The liquid inlet connector is disposed on the upper housing 1 and communicates with the filter chamber. A water blocking element 9 is provided at one end of the liquid inlet connector facing the lower housing 2. The water blocking element 9 is partially connected to the edge position of the end of the liquid inlet connector. The water blocking element 9 can effectively block the liquid entering the filter chamber from the liquid inlet connector from directly impacting the filter membrane 3, and can prevent the liquid from concentrating at a certain point during filtration, which helps the liquid to be evenly distributed during the filtration process, ensuring the consistency and effectiveness of filtration.

[0048] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A needle filter, characterized in that, The device includes an upper shell, a lower shell, a filter membrane, and a retaining ring. The edge of the upper shell is provided with a fastening element, and the upper shell is engaged with the lower shell through the fastening element to form a filter cavity. The filter membrane is placed in the filter cavity. The inner sidewall of the retaining ring is provided with a sealing groove, and the sidewalls of the upper shell and the lower shell are placed in the sealing groove to seal the gap at the connection between the upper shell and the lower shell.

2. The needle filter according to claim 1, characterized in that, Both the upper housing and the lower housing are provided with a retaining ring on opposite sides. When the upper housing is engaged with the lower housing through the buckle, the upper housing and the lower housing clamp the edge of the filter membrane through the retaining ring.

3. The needle filter according to claim 2, characterized in that, The retaining ring is spaced apart from the buckle and forms a filling cavity. The inner side of the ring is also provided with a filler. When the side walls of the upper housing and the lower housing are placed in the sealing groove, the filler is filled in the filling cavity.

4. The needle filter according to claim 3, characterized in that, The filter membrane extends toward the fastener and is fixedly connected to the filler.

5. The needle filter according to claim 1, characterized in that, The fastener is placed inside the circumference.

6. The needle filter according to any one of claims 1-5, characterized in that, The clasp is formed by one-time injection molding.

7. The needle filter according to claim 1, characterized in that, At least two sets of the fasteners are provided on the upper housing, and the fasteners are evenly distributed on the edge of the upper housing.

8. The needle filter according to claim 1, characterized in that, It also includes a support member disposed on the lower housing for supporting the filter membrane.

9. The needle filter according to claim 8, characterized in that, The lower housing is provided with multiple sets of support members, which are arranged radially and evenly on the lower housing with the center of the lower housing as the center, and the support members are spaced apart from each other.

10. The needle filter according to claim 1, characterized in that, It also includes a liquid inlet connector, which is disposed on the upper housing and communicates with the filter chamber. A water-blocking element is provided at one end of the liquid inlet connector facing the lower housing, and the water-blocking element is partially connected to the edge of the end of the liquid inlet connector.

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