High-flux nylon needle type filter

Abstract

The invention discloses a high-flux nylon needle type filter, and relates to the technical field of filters, the high-flux nylon needle type filter comprises a shell and a filter membrane arranged in the shell, the shell is provided with a liquid inlet pipe and a liquid outlet pipe, and the filter membrane divides the inner cavity of the shell into an upper chamber and a lower chamber; the filter membrane comprises an annular outer frame, a membrane sheet fixed in the outer frame in a tensioned manner, and a supporting net positioned below the membrane sheet; the supporting net is movably arranged in the outer frame and can rotate under the driving of filtering pressure, and the supporting net comprises an outer ring and an inner ring which are concentrically arranged in the outer frame, and a plurality of radial supporting strips for connecting the outer ring and the inner ring. According to the high-flux nylon needle type filter, the rotatable supporting net is introduced, and the shielding positions of the supporting strips on the filter membrane can be dynamically switched when the filter membrane is blocked, so that the inherent contradiction between the supporting reliability and the filtering flux is effectively balanced, and the improvement of the filtering efficiency is realized.

Description

Technical Field

[0001] This invention relates to the field of filter technology, and in particular to a high-throughput nylon needle filter. Background Technology

[0002] Needle filters are key consumables for sample pretreatment in laboratories and are widely used in chromatographic analysis, environmental monitoring, biopharmaceuticals, and other fields. They typically consist of a housing, an inlet, an outlet, and a core filter membrane. Their working principle involves connecting a syringe to the filter's inlet and manually pushing it to allow the liquid to flow into the housing, forcing it through the filter membrane, thereby achieving clarification, particle removal, sterilization, or sample purification.

[0003] In existing technologies, to ensure the filter membrane remains stable under liquid pressure and prevents rupture, a support mesh is typically placed below the filter membrane in the internal structure of needle filters. This support structure is crucial for maintaining the smoothness of the filtration process and protecting the integrity of the filter membrane. However, its framework inevitably obstructs the effective filtration area of ​​the filter membrane to some extent. This obstruction effect directly affects the liquid's permeability, thus limiting the filtration flux. Therefore, minimizing the negative impact of the support structure on the effective filtration area of ​​the filter membrane while ensuring the strength of the mechanical support has become a key design challenge for improving the overall performance of needle filters, especially for achieving high-flux filtration.

[0004] Therefore, there are still shortcomings and deficiencies in the existing technology, and how to provide a high-throughput nylon needle filter is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a high-throughput nylon needle filter, which solves the technical problem that the support mesh of existing needle filters, in order to achieve its mechanical support function of protecting the filter membrane, will inevitably block the filter membrane, which fundamentally conflicts with the requirement to maximize the effective filtration area to ensure high throughput.

[0006] To achieve the above objectives, the present invention provides a high-throughput nylon needle filter, comprising a housing and a filter membrane disposed within the housing. The housing has an inlet pipe and an outlet pipe, and the filter membrane divides the inner cavity of the housing into an upper chamber and a lower chamber. The filter membrane includes an annular outer frame, a membrane sheet tensioned and fixed within the outer frame, and a support mesh located below the membrane sheet. The support mesh is movably disposed within the outer frame and can rotate under the drive of filtration pressure.

[0007] Preferably, the support mesh includes an outer ring and an inner ring concentrically arranged within the outer frame, and a plurality of radial support strips connecting the outer ring and the inner ring, with hollow areas formed between adjacent support strips.

[0008] Preferably, an annular groove is provided on the inner ring of the outer frame, and the outer ring of the support mesh is rotatably embedded in the annular groove.

[0009] Preferably, a sealing ring is fitted around the outer periphery of the outer frame, and the sealing ring slides and seals with the inner wall of the housing.

[0010] Preferably, at least two limiting rods are fixed to the top of the outer frame, and the limiting rods are inserted into holes in the inner top wall of the housing.

[0011] Preferably, a spring is provided between the outer frame and the bottom wall of the inner cavity of the housing.

[0012] Preferably, it also includes a trigger, which includes a plurality of top blocks fixed to the bottom of the outer ring of the support mesh and a plurality of bottom blocks fixed to the bottom wall of the inner wall of the housing; The top block has a pointed bottom end, and the bottom block has a guide slope. When the diaphragm moves downward, the pointed end of the top block contacts and slides with the guide slope of the bottom block, driving the support net to rotate.

[0013] Preferably, the inclined surfaces of the top and bottom blocks are configured such that when the filter membrane assembly moves down to the lower limit position, the rotation angle of the support mesh is less than the included angle between the centers of two adjacent radial support strips.

[0014] Preferably, the width of the support strip is smaller than the distance between two adjacent support strips.

[0015] The present invention has the following advantages: (1) Compared with the above-mentioned background technology, the high-flux nylon needle filter provided by the present invention effectively solves the inherent contradiction between the mechanical support strength of the filter membrane and the effective filtration area in traditional needle filters by setting a dynamic rotating support net. Specifically, when the filter membrane experiences a decrease in flux due to blockage and an increase in the water pressure above, the pressure drives the entire filter membrane assembly to move downward, and then the support net rotates at a small angle through the triggering mechanism of the inclined surfaces of the top and bottom blocks. This action changes the position of the radial support strips of the support net relative to the filter membrane above, fully exposing the areas of the filter membrane surface that were originally blocked and not involved in filtration. Thus, without sacrificing the reliability of the mechanical support, the effective filtration area is dynamically updated and rotated, improving the overall utilization rate of the filter membrane and maintaining the high flux and stability of the filtration process.

[0016] (2) Compared with the above-mentioned background technology, the high-throughput nylon needle filter provided by the present invention uses the hydraulic pressure naturally generated during the filtration operation as the driving force, and can automatically complete a series of actions of "pressure sensing, displacement triggering, and rotation switching" without external intervention. This not only restores and prolongs the efficient working state of the filter membrane, but its core action, the rotation of the support mesh, can also disturb the flow field below the filter membrane, which can slow down the deposition rate of particulate matter to a certain extent. In addition, by ensuring that the rotation angle is always less than the spacing of the support bars, repeated shading caused by ineffective rotation is avoided, thus forming a simple, reliable, and adaptive high-throughput filtration solution. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the housing structure of the present invention; Figure 3 For the present invention Figure 2 A magnified schematic diagram of the structure at point A; Figure 4 This is a schematic diagram of the support mesh structure of the present invention.

[0019] In the diagram: 1. Shell; 2. Filter membrane; 3. Inlet pipe; 4. Trigger; 5. Inner cavity; 6. Support mesh; 7. Sealing ring; 8. Spring; 9. Limiting rod; 10. Drain pipe; 101. Top shell; 102. Bottom shell; 201. Outer frame; 202. Diaphragm; 601. Outer ring; 602. Inner ring; 603. Support bar; 401. Top block; 402. Bottom block. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] This invention provides a high-throughput nylon needle filter, which, by introducing a rotatable support mesh 6, can dynamically switch the position of the support bar 603 blocking the filter membrane 2 when the filter membrane 2 is clogged. This effectively balances the inherent contradiction between support reliability and filtration throughput, thereby improving filtration efficiency. Furthermore, it solves the problem that in existing needle filters, the support mesh 6, in order to fulfill its mechanical support function of protecting the filter membrane 2, inevitably blocks the filter membrane 2, which fundamentally conflicts with the requirement to maximize the effective filtration area to ensure high throughput.

[0023] Please refer to this as well. Figures 1 to 4 This invention provides a high-throughput nylon needle filter, the basic structure of which includes a sealed housing 1, inside which a nylon filter membrane 2 is disposed. An inlet pipe 3 and a drain pipe 10 are respectively connected to and pass through the top and bottom of the housing 1. These two pipes are connected to the internal chamber of the housing 1, allowing the liquid flow path to run through the entire filter. The crucial filter membrane 2 is positioned in the fluid channel between the inlet pipe 3 and the drain pipe 10, thus blocking the entire liquid flow path. In use, the inlet pipe 3 of the filter is connected to the outlet of a syringe. Pushing the syringe plunger forces the liquid to be treated into the inlet pipe 3 and into the housing 1. Driven by pressure, the liquid must pass through the nylon filter membrane 2. Particulate matter and other impurities are trapped by the filter membrane 2, while the purified filtrate continues to flow through the drain pipe 10 and is discharged, thus completing one filtration operation.

[0024] Specifically, such as Figure 1 and Figure 2 As shown, the housing 1 is composed of a top shell 101 and a bottom shell 102, which are detachably connected by threads. When fastened together, they form a hollow, sealed chamber. At the top of the housing 1, an inlet pipe 3 is integrally formed or fixedly connected. This inlet pipe 3 communicates with the inner cavity 5 of the housing 1, and its outer side is typically threaded for a threaded connection with the syringe interface. Correspondingly, at the bottom of the housing 1, a drain pipe 10 is provided. This drain pipe 10 also communicates with the inner cavity 5 of the housing 1, through which the filtered liquid is finally discharged.

[0025] like Figure 1 and Figure 3As shown, the filter membrane 2 specifically comprises an annular outer frame 201 and a nylon microporous membrane 202 tightly fixed to the inner edge of the outer frame 201. The membrane 202 is sealed and held in place within the inner cavity 5 of the housing 1 by its outer frame 201, thereby dividing the entire inner cavity 5 into two independent spaces: an upper inlet chamber and a lower outlet chamber. To prevent the soft nylon membrane 202 from deforming or rupturing during filtration, especially under high liquid pressure, a rigid support mesh 6 is tightly fitted below the membrane 202. This support mesh 6 is housed within the inner ring of the outer frame 201 of the membrane 202, and its function is to provide comprehensive and effective mechanical support for the membrane 202, ensuring the stability and safety of the filtration process.

[0026] In this embodiment, the surface of the support mesh 6 is designed with a uniformly distributed, large-area perforated structure. During actual use, when the operator pushes the syringe to allow the liquid to be filtered to enter the inner cavity 5 of the housing 1 through the inlet pipe 3, the liquid will pass through the diaphragm 202 under pressure to complete filtration. At this time, the fluid pressure acting on the surface of the diaphragm 202 is effectively borne by the tightly fitted support mesh 6 below, thereby preventing the diaphragm 202 from deforming or breaking due to excessive pressure. Simultaneously, the filtered clean liquid can smoothly flow through the large-area perforated area on the support mesh 6, quickly flowing to the drain pipe 10 and being discharged. This ensures the reliability of the support while minimizing flow resistance, guaranteeing a smooth and efficient filtration process.

[0027] In the high-throughput nylon needle filter structure of this embodiment, a certain distance is intentionally provided between the support mesh 6 and the bottom wall of the inner cavity 5 of the housing 1. In other words, the support mesh 6 is suspended in the inner cavity 5 of the housing 1. This layout aims to create a flow space below the support mesh 6, allowing the liquid purified by the membrane 202 to smoothly enter and collect.

[0028] It is important to clarify that the size of the support area of ​​the support mesh 6 directly affects its effective support for the membrane 202 above it: the larger the support area, i.e., the more solid parts of the support mesh 6's skeleton structure, the stronger its compressive support for the membrane 202; conversely, if the support area is too small, the support effect will be weakened. However, if the support area is excessively increased in pursuit of support strength, the perforated area on the support mesh 6 will decrease accordingly. This means that more of the membrane 202 will be obscured by the skeleton, reducing the effective flow area for filtration and thus directly limiting the filtration flux. Therefore, within the existing technological framework, there is an inherent and irreconcilable contradiction between the support reliability of the membrane 202 and its filtration flux.

[0029] To resolve the aforementioned contradictions, this embodiment proposes a dynamic support mechanism. For example... Figure 1 and Figure 3As shown, this mechanism designs the support mesh 6 to be rotatable within the housing 1, with its rotation controlled by a trigger 4. Specifically, under normal filtration conditions, the support mesh 6 is stably positioned below the membrane 202, providing necessary basic support. When the filtration flux decreases due to partial blockage of the membrane 202, the liquid pressure above the membrane 202 increases significantly. This increased pressure pushes the membrane 202 downward, thereby forcing the support mesh 6 below to move downward as well. The downward movement of the support mesh 6 activates the trigger 4, which converts the vertical downward movement of the support mesh 6 into a rotational movement about its axis. Through the angular rotation of the support mesh 6, the position of its frame blocking the membrane 202 changes, exposing the previously blocked area of ​​the membrane 202. In this way, without excessively sacrificing mechanical support, the flow area of ​​the membrane 202 is effectively restored, thereby dynamically maintaining the stability of the filtration flux.

[0030] In a further design of this embodiment, such as Figure 2 and Figure 4 As shown, the specific structure of the support net 6 includes an outer ring 601, an inner ring 602, and radial support strips 603 connecting the two. The outer ring 601 is disposed within the inner circle of the outer frame 201 of the diaphragm 202 and is rotatably connected to the outer frame 201. Specifically, an annular groove is formed in the inner circle of the outer frame 201 of the diaphragm 202, and the outer ring 601 of the support net 6 is embedded in this groove, thereby allowing the entire support net 6 to rotate within a fixed plane.

[0031] like Figure 3 and Figure 4 As shown, a smaller diameter inner ring 602 is concentrically arranged inside the outer ring 601. The two are fixedly connected by multiple radial support strips 603 arranged in a circular array along the circumference. The inner and outer ends of the support strips 603 are fixed to the outer ring of the inner ring 602 and the inner ring of the outer ring 601, respectively. The area between two adjacent radial support strips 603 forms a large area of ​​perforation for the filtrate to pass through. In particular, the width of each support strip 603 is designed to be smaller than the spacing between two adjacent support strips 603. Through this arrangement, a large number of support strips 603 can be set under normal conditions, thereby providing sufficient and uniform support force for the membrane 202. When the membrane 202 experiences a decrease in flux and an increase in water pressure due to partial blockage, the downward pressure of the membrane 202 will cause the entire support mesh 6 to rotate at a small angle. This rotation changes the position of the support bar 603 relative to the membrane 202 above it, thereby exposing the areas of the membrane 202 that were originally covered by the support bar 603 to participate in filtration, while the filtered areas move above the support bar 603. This dynamic adjustment ensures that different areas on the surface of the membrane 202 can be recycled, thus significantly improving the overall effective filtration flux and utilization rate of the membrane 202.

[0032] To ensure the reliable operation of the above dynamic adjustment mechanism, a sealing ring 7 is provided on the outer ring of the outer frame 201 of the diaphragm 202. The sealing ring maintains a sliding seal with the side wall of the inner cavity 5 of the housing 1, thereby ensuring the independence and sealing between the upper and lower chambers while allowing the outer frame 201 to move axially (longitudinally).

[0033] In addition, at least two circumferentially symmetrically distributed limiting rods 9 are fixed to the top of the outer frame 201. These limiting rods 9 are inserted into corresponding holes on the top of the inner cavity 5 of the top shell 101. This serves as a guide, preventing the outer frame 201 from rotating circumferentially during movement and also constraining its longitudinal travel. A spring 8 providing elastic restoring force is provided between the outer frame 201 and the bottom wall of the inner cavity 5 of the shell 1. Under normal conditions, the spring 8 is in a pre-compressed state, providing stable initial support for the diaphragm 202 assembly. When the diaphragm 202 becomes blocked, causing an increase in water pressure above, the diaphragm 202 and the outer frame 201 assembly can overcome the force of the spring 8 and move downwards, triggering the action.

[0034] In this embodiment, as Figure 2 and Figure 3 As shown, the trigger 4 specifically comprises a top block 401 and a bottom block 402. At least two top blocks 401 are arranged in a circular array along the circumference of the bottom wall of the outer ring 601 of the support mesh 6, and the bottom end of each top block 401 is machined into a pointed structure. Correspondingly, an equal number of bottom blocks 402 are fixed to the bottom wall of the inner cavity 5 of the housing 1 in the same circular array, with each bottom block 402 corresponding vertically to one top block 401. One side of the outer wall of each bottom block 402 is machined into a guide slope with a certain inclination angle. Under normal conditions, the tip of the top block 401 is precisely aligned with the highest point of the guide slope of the corresponding bottom block 402 below it. When the diaphragm 202 becomes blocked, causing the support net 6 assembly to be pressed down, the tip of the top block 401 immediately contacts the top of the inclined surface of the bottom block 402. As the assembly continues to descend, the inclined surface guides the entire outer ring 601 together with the support net 6 to rotate at an angle, thereby enabling the support bar 603 to switch the position of blocking the diaphragm 202.

[0035] It is worth noting that this embodiment achieves precise control of the rotation angle of the support mesh 6 by designing the relationship between the inclination angle of the bottom block 402 and the downward stroke of the top block 401. Specifically, the parameters are set as follows: when the outer frame 201 of the diaphragm 202 descends to its lower limit position, that is, when the tip of the top block 401 touches the bottom wall of the inner cavity 5 of the housing 1, the cumulative rotation angle of the outer ring 601 is strictly limited to less than the central angle between the two adjacent radial support bars 603. This key design ensures that when the support mesh 6 is triggered, its rotation amplitude is sufficient to fully expose the area on the diaphragm 202 that was originally covered by the support bars 603, while avoiding the situation where the position of the new support bar 603 after rotation is exactly the same as before rotation due to excessive rotation angle. This effectively prevents the effective filtration area of ​​the diaphragm 202 from being repeatedly blocked, ensuring a substantial increase in filtration flux.

[0036] In this embodiment, during operation: In the initial filtration state, the operator connects the syringe to the filter inlet pipe 3 and pushes the push rod. The filtered liquid enters the upper chamber of the housing 1 under pressure, then passes through the filter membrane 2 to complete purification. The filtrate collects through the hollow area of ​​the lower support net 6 and is finally discharged through the drain pipe 10. At this time, the filter membrane 2 assembly is in the upper position under the support of the spring 8, and the support net 6 provides stable support for it. As filtration proceeds, if the filter membrane 2 becomes partially blocked due to the trapping of particulate matter, the liquid pressure above it will increase significantly. This pressure overcomes the preload of the spring 8 and pushes the entire filter membrane 2 assembly (including the outer frame 201, filter membrane 2, and support net 6) downward. During this downward movement, the tip of the top block 401 fixed to the bottom of the outer ring 601 of the support net 6 will contact and slide along the inclined surface of the bottom block 402 fixed to the bottom wall of the housing 1. The inclined surface guides the vertical downward movement into rotational motion, causing the support net 6 to rotate by a small angle (this angle is smaller than the center angle between adjacent support bars 603). This rotation changes the position of the radial support strips 603 of the support net 6 relative to the filter membrane 2, exposing the areas on the surface of the filter membrane 2 that were previously blocked and not fully involved in filtration. At the same time, it moves the working areas to rest above the support strips 603, thereby dynamically updating the effective filtration area without stopping the machine, effectively alleviating the problem of reduced flux caused by local blockage.

[0037] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0038] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A high-flux nylon needle filter, comprising a housing (1) and a filter membrane (2) disposed within the housing (1), the housing (1) having an inlet pipe (3) and an outlet pipe (10), the filter membrane (2) dividing the inner cavity (5) of the housing (1) into an upper chamber and a lower chamber; characterized in that, The filter membrane (2) includes an annular outer frame (201), a membrane sheet (202) tensioned and fixed inside the outer frame (201), and a support net (6) located below the membrane sheet (202); the support net (6) is movably disposed inside the outer frame (201) and can rotate under the drive of filtration pressure.

2. The high-flux nylon needle filter according to claim 1, characterized in that, The support mesh (6) includes an outer ring (601) and an inner ring (602) concentrically arranged within the outer frame (201), and a plurality of radial support strips (603) connecting the outer ring (601) and the inner ring (602), with a hollow area formed between adjacent support strips (603).

3. A high-flux nylon needle filter according to claim 2, characterized in that, The inner ring of the outer frame (201) has an annular groove, and the outer ring (601) of the support net (6) is rotatably embedded in the annular groove.

4. A high-flux nylon needle filter according to claim 1, characterized in that, The outer frame (201) is fitted with a sealing ring on its outer periphery, and the sealing ring slides and seals with the inner wall of the housing (1).

5. A high-flux nylon needle filter according to claim 1, characterized in that, At least two limiting rods (9) are fixed to the top of the outer frame (201), and the limiting rods (9) are inserted into the holes in the inner top wall of the housing (1).

6. A high-flux nylon needle filter according to claim 1, characterized in that, A spring (8) is provided between the outer frame (201) and the bottom wall of the inner cavity (5) of the housing (1).

7. A high-flux nylon needle filter according to claim 2, characterized in that, It also includes a trigger (4), which includes a plurality of top blocks (401) fixed to the bottom of the outer ring (601) of the support mesh (6) and a plurality of bottom blocks (402) fixed to the inner bottom wall of the housing (1). The top block (401) has a pointed bottom end, and the bottom block (402) has a guide slope. When the diaphragm (202) moves down, the pointed end of the top block (401) contacts and slides with the guide slope of the bottom block (402), driving the support net (6) to rotate.

8. A high-flux nylon needle filter according to claim 7, characterized in that, The inclined surfaces of the top block (401) and the bottom block (402) are configured such that when the filter membrane (2) assembly moves down to the lower limit position, the rotation angle of the support net (6) is less than the center angle between two adjacent radial support strips (603).

9. A high-flux nylon needle filter according to claim 8, characterized in that, The width of the support bar (603) is smaller than the distance between two adjacent support bars (603).

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