A micro-porous fluid control and fluid handling assembly

Abstract

This invention discloses a microporous fluid control component and fluid processing assembly, relating to the fields of micro / nano fluid control and precision manufacturing technology. It includes a substrate and a flow field control structure. The substrate has a first surface for receiving fluid and interacting with an external shear flow field, and a second surface for discharging fluid. Several main flow channels are disposed on the substrate, penetrating the first and second surfaces. The flow field control structure includes several flow field control subsystems. The solid region of the first surface and / or the inner wall of the main flow channels are provided with flow field control subsystems. Each flow field control subsystem includes multiple micro-fluid interference components with preset three-dimensional geometric shapes. This microporous fluid control component and fluid processing assembly causes shear thinning of the fluid, significantly reducing near-wall viscosity, eliminating stagnant layers, and thus improving the filling efficiency and throughput of the slurry entering the main flow channels.

Description

Technical Field

[0001] This invention relates to the field of micro-nano fluid control and precision manufacturing technology, and in particular to a microporous fluid control device and fluid processing assembly. Background Technology

[0002] In microfabrication and fluid separation engineering, high-performance fluid control components (such as photovoltaic printing screens and precision microfiltration membranes) play a decisive role. However, with the improvement of processing precision, the dynamic behavior of fluids at the microscale faces common technical challenges: In the traditional screen printing process, the squeegee moves tangentially along the first surface (S-surface) of the screen, providing the main macroscopic shear force, but this is a one-way pushing action. The paste mainly moves horizontally, sliding over the mesh openings and entering the mesh openings by gravity and partial hydraulic pressure. This single flow field lacks an active lateral guidance mechanism, resulting in insufficient dynamic capture efficiency of the paste by the mesh openings during high-speed printing. Although the squeegee is in close contact with the first surface (S-surface), at the microscale, the extremely thin fluid layer in the solid area close to the first surface (S-surface), the mesh opening edge area, and the inner wall of the channel is easily trapped due to the viscous adsorption of the fluid. This trapped paste not only has poor fluidity but also hinders the entry of subsequent fresh paste into the mesh openings to a certain extent, thereby reducing the effective inlet diameter of the mesh openings. Summary of the Invention

[0003] To address the above technical problems, this invention provides a microporous fluid control component and a fluid processing assembly, which causes the fluid to undergo shear thinning, significantly reducing near-wall viscosity and eliminating the stagnant layer, thereby improving the filling efficiency and throughput of the slurry entering the main flow channel.

[0004] To achieve the above objectives, the present invention provides the following solution: This invention provides a microporous fluid control device, comprising a substrate and a flow field regulation structure. The substrate has a first surface for receiving fluid and interacting with an external shear flow field, and a second surface for discharging fluid. The substrate is provided with a plurality of main flux channels penetrating the first and second surfaces. The flow field regulation structure includes a plurality of flow field regulation subsystems. The flow field regulation subsystems are provided in the solid region of the first surface and / or on the inner sidewall of the main flux channels. The flow field regulation subsystems include a plurality of microfluidic interference components with preset three-dimensional geometric shapes.

[0005] Preferably, it also includes a hollowed-out connecting structure, the two ends of which are respectively connected to the two inner sidewalls opposite to the main flow channel.

[0006] Preferably, the flow field control subsystem is provided on the frontal surface of the hollowed-out connecting structure.

[0007] Preferably, the microfluidic interference component is a point-like microfluidic interference component, the cross-section of which includes a frontal end with a first radius of curvature and a back end with a second radius of curvature, the first radius of curvature being greater than or equal to the second radius of curvature, and the flow field control subsystem including multiple discretely distributed point-like microfluidic interference components; or, the microfluidic interference component is a strip-like microfluidic interference component, the strip-like microfluidic interference component having a herringbone or V-shaped ridge structure, and the flow field control subsystem including multiple strip-like microfluidic interference components arranged sequentially along a preset tangential flow direction, the tips of which all point towards or away from the preset tangential flow direction.

[0008] Preferably, the flow field control subsystem includes multiple rows of first flow field control components arranged sequentially along a preset tangential flow direction. Each first flow field control component includes multiple point-like microfluidic interference components arranged sequentially along a direction perpendicular to the preset tangential flow direction. The point-like microfluidic interference components in any two adjacent rows of first flow field control components are staggered. Alternatively, the flow field control subsystem includes multiple sets of second flow field control components arranged sequentially along a preset tangential flow direction. Each second flow field control component includes multiple strip-like microfluidic interference components arranged sequentially along the preset tangential flow direction. The tips of the strip-like microfluidic interference components in any two adjacent sets of second flow field control components are staggered.

[0009] Preferably, the hollow connection structure includes one or more connection components arranged sequentially from top to bottom along the depth direction of the main flow channel, and the two ends of the connection component are fixedly connected to the two inner sidewalls opposite to the main flow channel.

[0010] Preferably, the connecting assembly includes a plurality of connecting beams arranged at equal intervals along the length direction of the main flow channel, and both ends of each connecting beam are fixedly connected to two inner sidewalls opposite to the main flow channel; the upper part of the cross-section of the connecting beam has a diversion part facing upstream of the fluid and the lower part has a confluence part facing downstream of the fluid, and the cross-section of the connecting beam is a streamlined structure or a non-rectangular polygonal structure.

[0011] Preferably, when the hollow connection structure includes multiple connection components, the total flow cross-sectional area of ​​the upper connection component in any two adjacent connection components is greater than the total flow cross-sectional area of ​​the lower connection component, and the maximum width of the cross-section of the upper connection beam in any two adjacent connection components is greater than the maximum width of the cross-section of the lower connection beam; the width of the cross-section of the connection beam decreases sequentially from top to bottom.

[0012] Preferably, the main flow channel includes a receiving cavity section and a throttling throat section connected sequentially from top to bottom, and the cross-sectional dimension of the receiving cavity section at the same location is larger than the cross-sectional dimension of the throttling throat section; when the hollow connection structure includes one connecting component, the connecting component is disposed in the receiving cavity section; when the hollow connection structure includes multiple connecting components, all the connecting components are sequentially disposed in the receiving cavity section from top to bottom, or at least one connecting component is disposed in both the receiving cavity section and the throttling throat section.

[0013] The present invention also provides a fluid processing assembly, including a shearing mechanism and a microporous fluid control component, wherein the shearing mechanism is configured to cooperate with the first surface; the microporous fluid control component is a printing screen, and the shearing mechanism is a scraper; or, the microporous fluid control component is a precision filter membrane, and the shearing mechanism is a pumping device for generating tangential flow.

[0014] The present invention achieves the following technical effects compared to the prior art: In this invention, a flow field control subsystem composed of multiple microfluidic interference components with preset three-dimensional morphologies is set in the first surface solid region and / or the inner wall of the main flux channel. Under the action of the external shear flow field, it generates local disturbance, diversion and lateral guidance effects on the fluid near the wall and orifice, breaking the unidirectional push flow field and forcing the fluid to form multi-directional microscale flow before entering the main flux channel, thereby improving the dynamic filling and capture efficiency of the fluid into the orifice. At the same time, the microfluidic interference components can destroy the viscous retention layer structure tightly attached to the wall, reduce the adsorption and retention of fluid on the substrate surface and the inner wall of the channel, avoid the retention slurry blocking the channel inlet, maintain the stability of the effective diameter of the main flux channel, and thus significantly improve the fluid throughput and uniformity under high-speed conditions. This fundamentally solves the technical problems of low capture efficiency and reduced diameter caused by the single flow field and near-wall retention in traditional structures. Photovoltaic silver paste is a highly thixotropic non-Newtonian fluid with extremely high viscosity when at rest. In this invention, obstacles are created by using micro-fluid interference components with a preset three-dimensional morphology to induce secondary flows such as flipping and folding of the fluid. This secondary flow brings extremely high-frequency micro-shear forces, which forcibly break the network structure of the boundary layer fluid, causing it to thin out under shear, significantly reducing near-wall viscosity, eliminating the stagnant layer, and thus improving the filling efficiency and throughput of the paste into the main flux channel. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A top view of the microporous fluid control component provided by the present invention when it employs a connecting beam and a point-like microfluidic interference component. Figure 2 A schematic diagram of the dead zone when the microporous fluid control component provided by the present invention uses a connecting beam and a point-like microfluidic interference component. Figure 3 Printing effect diagram of the microporous fluid control component provided by the present invention when a connecting beam and a point-like microfluidic interference component are used. Figure 4 A top view of a prior art microporous fluid control component using a connecting beam and without microfluid interference components; Figure 5 A schematic diagram of the dead zone when a connecting beam is used in a microporous fluid control component in the prior art and no microfluid interference component is provided. Figure 6 A printing effect diagram of a microporous fluid control component in the prior art when a connecting beam is used and no microfluid interference components are set; Figure 7 A top view of the microporous fluid control component provided by the present invention when the first surface adopts a strip-shaped microfluidic interference component; Figure 8 This is a layout diagram of the connecting beam in the microporous fluid control component provided by the present invention, when the connecting beam is a single layer and the cross-section is diamond-shaped. Figure 9 The image shows a printed effect of a single-layer connecting beam with a diamond-shaped cross-section in the microporous fluid control component provided by this invention. Figure 10 This is a layout diagram of a microporous fluid control component in the prior art when the connecting beam is a single layer with a rectangular cross-section. Figure 11 A printing effect diagram of a microporous fluid control component in the prior art when the connecting beam is a single layer with a rectangular cross-section. Figure 12 This is a layout diagram of the connecting beams in the microporous fluid control component provided by the present invention, where the connecting beams are arranged in two corresponding layers and have a diamond-shaped cross-section. Figure 13 A printing effect diagram of the connecting beams in the microporous fluid control component provided by the present invention, where the connecting beams are arranged in two corresponding layers and have a diamond-shaped cross-section. Figure 14 This is a layout diagram of the connecting beams in the microporous fluid control component provided by the present invention, where the connecting beams are arranged in a double-layered staggered configuration and have a diamond-shaped cross-section. Figure 15 A printing effect diagram of the connecting beams in the microporous fluid control component provided by the present invention, which are arranged in a double-layered staggered configuration and have a diamond-shaped cross-section. Figure 16 The front view of the microporous fluid control component provided by the present invention, wherein the cross-section of the upper connecting beam is diamond-shaped and the cross-section of the lower connecting beam is teardrop-shaped; Figure 17 The layout diagram of the upper connecting beam with a diamond-shaped cross-section and the lower connecting beam with a teardrop-shaped cross-section in the microporous fluid control component provided by the present invention. Figure 18 This is a schematic diagram of the structure of the fluid processing component provided by the present invention when used for screen printing.

[0017] Explanation of reference numerals in the attached drawings: 1. Matrix; 2. Gradient zone in the middle; 3. Non-gradient zone; 4. Connecting beam; 5. Microfluidic interference component; 6. Receiving cavity section; 7. Throttling throat section; 8. Printing screen; 9. Adhesive zone; 10. Flexible mesh area; 11. Rigid frame. Detailed Implementation

[0018] 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.

[0019] The purpose of this invention is to provide a microporous fluid control component and a fluid processing assembly that causes the fluid to undergo shear thinning, significantly reducing near-wall viscosity, eliminating the stagnant layer, and thereby improving the filling efficiency and throughput of the slurry entering the main flow channel.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1: like Figures 1-3 , Figures 7-9 as well as Figures 12-17As shown, this embodiment provides a microporous fluid control device, including a substrate 1 and a flow field control structure. The substrate 1 has a first surface for receiving fluid and interacting with an external shear flow field and a second surface for discharging fluid. The substrate 1 is provided with a plurality of main flux channels penetrating the first and second surfaces. The flow field control structure includes a plurality of flow field control subsystems. The solid region of the first surface and / or the inner wall of the main flux channels are provided with flow field control subsystems. The flow field control subsystems include a plurality of microfluidic interference components 5 with preset three-dimensional geometric shapes.

[0022] It should be noted that the microfluidic interference component 5 with a preset three-dimensional geometric shape can be protruding or concave. In this embodiment, the microfluidic interference component 5 is a protruding structure.

[0023] This embodiment also includes a hollow connection structure, with both ends of the hollow connection structure connected to the two inner sidewalls opposite to the main flow channel.

[0024] To accommodate the specific requirements at the connection between the main grid and the fine grid of the solar cell, existing screen printing plates incorporate gradient zones and introduce perforated connecting structures within the mesh openings of these gradient zones to enhance the structure. In this embodiment, the main flux channel includes a central gradient zone 2 and non-gradient zones 3 connecting the two ends of the central gradient zone 2. The cross-sectional dimensions of the central gradient zone 2 gradually increase from one end near a non-gradient zone 3 to the end near the center of the central gradient zone 2. The cross-sectional dimensions of the non-gradient zones 3 are the same as the cross-sectional dimensions at the connection between the central gradient zone 2 and the non-gradient zones 3. The perforated connecting structure is located within the central gradient zone 2.

[0025] The flow field control subsystem is installed on the front surface of the hollowed-out connecting structure. A micro-fluid interference component 5 is installed on the front surface of the hollowed-out connecting structure, which can induce local micro-turbulence within the main flow channel, reduce the frictional resistance of the slurry flowing over the surface of the hollowed-out connecting structure, and guide the slurry smoothly around the hollowed-out connecting structure to fill the rear, effectively eliminating the shadow effect caused by the hollowed-out connecting structure and ensuring a full printing morphology in the area with the hollowed-out connecting structure.

[0026] In this embodiment, the flow field control structure is set in the fluid-facing region, which includes the first surface solid area of ​​the substrate 1, the inner wall of the main flux channel, and the flow-facing surface of the hollowed-out connecting structure.

[0027] A flow field control subsystem consisting of multiple microfluidic interference components 5 with preset three-dimensional morphologies is installed in the first surface solid region and / or the inner wall of the main flux channel. Under the action of the external shear flow field, it generates local disturbance, diversion and lateral guidance effects on the fluid near the wall and orifice, breaks the unidirectional flat flow field, and forces the fluid to form multi-directional microscale flow before entering the main flux channel, thereby improving the dynamic filling and capture efficiency of the fluid into the orifice. At the same time, the microfluidic interference components 5 can destroy the viscous retention layer structure that is tightly attached to the wall, reduce the adsorption and retention of fluid on the substrate surface and the inner wall of the channel, avoid the retention slurry from blocking the channel inlet, maintain the stability of the effective diameter of the main flux channel, and thus significantly improve the fluid throughput and uniformity under high-speed conditions. This fundamentally solves the technical problems of low capture efficiency and reduced diameter caused by the single flow field and near-wall retention in traditional structures.

[0028] Photovoltaic silver paste is a highly thixotropic non-Newtonian fluid with extremely high viscosity when at rest. In this invention, obstacles are created by using a micro-fluid interference component 5 with a preset three-dimensional morphology to induce secondary flow such as flipping and folding of the fluid. This secondary flow brings extremely high frequency micro-shear force, which forcibly breaks the network structure of the boundary layer fluid, causing it to thin out under shear, significantly reducing near-wall viscosity, eliminating the stagnant layer, and thus improving the filling efficiency and throughput of the paste into the main flux channel.

[0029] Specifically, the microfluidic interference component 5 disposed on the first surface can transform the single horizontal shear flow generated by the shearing mechanism into a complex three-dimensional flow with a vertical component, that is, induce the fluid to generate a secondary flow with a component perpendicular to the main flow direction. This micro-vortex can actively guide the slurry flowing across the solid surface and entrain it into the main flow channel, significantly improving the dynamic capture efficiency of the slurry by the mesh and solving the problem of the slurry sliding down without entering during high-speed printing. The microfluidic interference component 5 effectively disrupts the fluid viscous boundary layer tightly adhering to the solid surface of the first surface, preventing high-viscosity slurry from stagnating or accumulating at the mesh inlet edge, ensuring that the mesh inlet always maintains the maximum effective diameter, which is conducive to rapid slurry filling. The microfluidic interference component 5 protruding from the first surface acts as a mechanical buffer layer between the shearing mechanism and the substrate 1. During operation, the protruding microfluidic interference component 5 preferentially bears the frictional wear of the shearing mechanism, thereby protecting the geometric integrity of the first surface of the substrate 1 and the mesh edge. Even if the microfluidic interference component 5 wears, the main structure of the substrate 1 remains intact, significantly extending its service life. A microfluidic interference component 5 is provided on the inner wall of the main flux channel to guide the fluid to smoothly transition from the first surface to the second surface and prevent the fluid from generating eddy dead zones on the inner wall of the main flux channel.

[0030] The microfluidic interference component 5 is a point-like microfluidic interference component. The cross-section of the point-like microfluidic interference component includes a front end with a first radius of curvature and a back end with a second radius of curvature. The first radius of curvature is greater than or equal to the second radius of curvature. The flow field control subsystem includes multiple point-like microfluidic interference components that are discretely distributed.

[0031] Preferably, the first radius of curvature is larger than the second radius of curvature to minimize fluid flow resistance and suppress dead zones on the back side. The upstream end of the point-like microfluidic interference component has a larger first radius of curvature, configured to reduce fluid impact resistance; the downstream end of the point-like microfluidic interference component has a second radius of curvature smaller than the first radius of curvature, configured to control wake shedding. The upstream and downstream ends of the point-like microfluidic interference component are connected by smooth sidewalls.

[0032] Specifically, the cross-section of the point-like microfluidic interference component is circular, rhomboid, elliptical, crescent-shaped, triangular, or other fluid dynamic shapes, and its three-dimensional form can be columnar, frustum-shaped, or hemispherical.

[0033] In this specific embodiment, the flow field control subsystem includes multiple rows of first flow field control components arranged sequentially along a preset tangential flow direction. Each first flow field control component includes multiple point-like microfluidic interference components arranged sequentially along a direction perpendicular to the preset tangential flow direction. The point-like microfluidic interference components in any two adjacent rows of first flow field control components are staggered, that is, the projection position of the microfluidic interference component 5 in the next row in the preset tangential flow direction at least partially covers the gap between the microfluidic interference components 5 in the previous row, thereby constructing a labyrinthine flow path that forces the fluid to deflect laterally.

[0034] In this embodiment, the point-like microfluidic interference components satisfy the following geometric parameter relationships: the ratio of the center-to-center distance S1 between two adjacent rows of microfluidic interference components 5 in the preset tangential flow direction to the characteristic projection width W of the microfluidic interference component 5 in the direction perpendicular to the preset tangential flow direction satisfies 1≤S1 / W≤10, ensuring that the microfluidic interference components 5 in the next row are located within the influence zone of the fluid wake generated by the microfluidic interference components 5 in the previous row. The lateral net distance S2 between adjacent microfluidic interference components 5 in the same row is greater than 3.0 times the characteristic particle size D90 of the dispersed phase particles in the target fluid, to prevent lateral bridging and blockage by particles.

[0035] Alternatively, the microfluidic interference component 5 is a strip-shaped microfluidic interference component. The strip-shaped microfluidic interference component has a ridge structure in the shape of a herringbone or a V. The flow field control subsystem includes multiple strip-shaped microfluidic interference components arranged sequentially along a preset tangential flow direction of the fluid. The tips of the strip-shaped microfluidic interference components all point to or away from the preset tangential flow direction of the fluid, so as to induce the fluid to generate Dean vortices that flip along the channel cross section.

[0036] Specifically, the strip-shaped microfluidic interference component includes two extended arms, the lengths of which and / or the angles between which the two extended arms and the tangential flow direction of the fluid are equal or unequal. Preferably, the lengths of the two extended arms and / or the angles between which the two extended arms and the tangential flow direction of the fluid are unequal.

[0037] In this specific embodiment, the flow field control subsystem includes multiple sets of second flow field control components arranged sequentially along a preset tangential fluid flow direction. Each second flow field control component includes multiple strip-shaped microfluidic interference components arranged sequentially along the preset tangential fluid flow direction. The tips of the strip-shaped microfluidic interference components in any two adjacent sets of second flow field control components are misaligned. That is, the strip-shaped microfluidic interference components in any two adjacent sets of second flow field control components undergo lateral topological shift, manifested as the tip positions being misaligned in a direction perpendicular to the preset fluid flow direction.

[0038] In this embodiment, the two extended arms of the strip-shaped microfluidic interference component have different lengths and different angles with the preset tangential flow direction of the fluid, forming an asymmetric flow guiding structure to induce overturning convection perpendicular to the tangential flow direction of the fluid. Simultaneously, the extended arms of two adjacent second flow field control components have different angles with the preset tangential flow direction of the fluid.

[0039] like Figure 1 As shown, the microporous fluid control component provided in this embodiment employs a connecting beam 4 and a point-like microfluidic interference component. For example... Figure 4 As shown, the existing microporous fluid control device uses a connecting beam 4 but does not have a microfluidic interference component 5. Figure 4 Microporous fluid control components and Figure 1 The difference in the microporous fluid control components lies in the absence of the microfluidic interference component 5, combined with... Figure 2 and Figure 5 It can be seen that the microporous fluid control device in this embodiment has a significantly reduced dead zone effect compared to microporous fluid control devices in the prior art. Combined with... Figure 3 and Figure 6It can be seen that the microporous fluid control device in this embodiment has a significantly better printing effect than the microporous fluid control device in the prior art, resulting in fuller and more consistent lines, and reducing dead zones, which can save ink. Cost control of printing inks such as silver paste is very important.

[0040] Specifically, the microfluidic interference component 5 is integrally formed with the first surface, the inner wall of the main flux channel, and the flow-facing surface of the hollowed-out connecting structure; or, the microfluidic interference component 5 is fixed to the first surface, the inner wall of the main flux channel, and the flow-facing surface of the hollowed-out connecting structure.

[0041] In this embodiment, the height of the microfluidic interference component 5 is configured to penetrate the fluid boundary layer in the fluid-facing region to induce secondary flow. Specifically, the height of the microfluidic interference component 5 protruding from the surface of the fluid-facing region is 3 μm to 15 μm. The height range of the microfluidic interference component 5 is set to adapt to the fluid boundary layer thickness of the target fluid at high shear rates, ensuring that the microfluidic interference component 5 can effectively penetrate the viscous sublayer of the fluid.

[0042] It should be noted that the intensity of the local flow field intervention of the microfluidic interference component 5 in the fluid-facing region exhibits a regional gradient change, thereby compensating for the flow resistance differences between the main flux channels in different regions.

[0043] Specifically, the local flow field intervention intensity of the microfluidic interference component 5 is positively correlated with the increase in local flow resistance caused by the aperture size of the main flux channel and the internal support components within the corresponding region. For example, in regions with greater fluid flow resistance, such as regions with smaller apertures and larger flow resistance in the hollowed-out connection structure, the local flow field intervention intensity of the microfluidic interference component 5 is higher, so as to achieve the balance of global fluid flux by enhancing the local shear thinning effect. The local flow field intervention intensity can be adjusted by the following geometric parameters: the distribution density of the microfluidic interference component, the characteristic cross-sectional area, the curvature of the frontal surface, and the misalignment degree of the spatial arrangement.

[0044] The hollow connection structure includes one or more connection components arranged sequentially from top to bottom along the depth direction of the main flow channel. The two ends of the connection components are fixedly connected to the two inner sidewalls opposite to the main flow channel.

[0045] In this specific embodiment, the connecting component includes a plurality of connecting beams 4 arranged at equal intervals along the length direction of the main flow channel, and both ends of each connecting beam 4 are fixedly connected to the two inner sidewalls opposite to the main flow channel.

[0046] Specifically, the upper part of the cross-section of the connecting beam 4 has a diversion section facing upstream of the fluid and the lower part has a confluence section facing downstream of the fluid. The cross-section of the connecting beam 4 is a streamlined structure or a non-rectangular polygonal structure, thereby guiding the fluid around the flow and suppressing the dead zone on the back flow side.

[0047] In this embodiment, the cross-section of the connecting beam 4 is rhomboid, hexagonal, diamond-shaped, or teardrop-shaped. The teardrop-shaped profile has a blunt, forward-facing leading edge and a sharp, backward-facing trailing edge, with the radius of curvature of the forward-facing leading edge being greater than that of the backward-facing trailing edge. This asymmetric profile can utilize the fluid adhesion effect to suppress boundary layer separation and guide the fluid to smoothly close behind the component. The optimized cross-sectional shape of the connecting beam 4 in this embodiment significantly reduces the flow resistance coefficient, resulting in higher printing fill speeds or filtration fluxes under the same pressure.

[0048] When the hollow connection structure includes multiple connecting components, the total flow cross-sectional area of ​​the upper connecting component in any two adjacent connecting components is greater than the total flow cross-sectional area of ​​the lower connecting component. Furthermore, the maximum width of the cross-section of the upper connecting beam 4 in any two adjacent connecting components is greater than the maximum width of the cross-section of the lower connecting beam 4. In this embodiment, the width of the cross-section of the connecting beam 4 decreases sequentially from top to bottom, thereby achieving a decreasing flow cross-sectional area within a single layer.

[0049] When the hollow connection structure includes multiple connecting components, the spacing between two adjacent connecting beams 4 in the multiple connecting components arranged sequentially from top to bottom along the depth direction of the main flow channel decreases sequentially. Specifically, the connecting beams 4 in two adjacent connecting components are staggered, and on the projection plane perpendicular to the fluid flow direction in the main flow channel, the projection overlap rate of the connecting beams 4 is less than 15%, or they present a completely complementary non-overlapping distribution to eliminate through-flow blind spots. This staggered arrangement causes a three-dimensional deflection of the fluid path, thereby eliminating the longitudinal flow shadow behind a single connecting beam 4 and promoting lateral mixing and flow field self-healing of the fluid after passing through the connecting beam 4.

[0050] like Figure 8 As shown, in this embodiment, the connecting beam 4 is a single layer with a diamond-shaped cross-section in the microporous fluid control component. Figure 10 As shown, in the prior art, the connecting beam 4 in the microporous fluid control component is a single layer with a rectangular cross-section. Figure 10 Microporous fluid control components and Figure 8 The difference in the microporous fluid control components lies in the cross-sectional shape of the connecting beam 4, combined with... Figure 9 and Figure 11 It can be seen that the microporous fluid control component in this embodiment has a better printing effect than the microporous fluid control component in the prior art.

[0051] like Figure 12 As shown, in the microporous fluid control component provided in this embodiment, the connecting beam 4 is arranged in two corresponding layers and has a diamond-shaped cross-section. For example... Figure 14 As shown, in the microporous fluid control component provided in this embodiment, the connecting beams 4 are arranged in a double-layered, staggered configuration with a diamond-shaped cross-section. Combined with... Figure 13 and Figure 15 It can be seen that, Figure 14 The microporous fluid control device provided by China is compared to Figure 12 The microporous fluid control components provided by the manufacturer have better printing results.

[0052] In this specific embodiment, the aim is to verify the effectiveness of layered misalignment in macroscopically eliminating shadows. Specifically, the connecting beam 4 is divided into upper and lower layers, each with a thickness of 5μm. Each layer uses a teardrop-shaped connecting beam 4 with a maximum cross-sectional width of 10μm, a length of 30μm, a radius of curvature of 5μm at the leading edge facing the flow, and a radius of curvature of 0.5μm at the trailing edge facing the flow. The center-to-center distance between two adjacent connecting beams 4 in each layer is 30μm, the distance between the upper and lower layers is 5μm, and the misalignment between the lower and upper connecting beams 4 is 15μm.

[0053] The wake region generated by the upper connecting beam 4 corresponds precisely to the frontal surface of the lower connecting beam 4. After bypassing the upper connecting beam 4, the fluid is again cut and guided by the lower connecting beam 4. This forced mixing in the Z-axis direction ensures that the flow field is highly homogenized when leaving the region of the connecting beam 4, eliminating the long wake shadow generated by a single component and achieving macroscopically seamless printing.

[0054] In screen printing applications, connecting beam 4 supports the mesh structure. The streamlined cross-section and adhesion effect ensure that the paste quickly converges behind connecting beam 4, eliminating printing marks. In cross-flow filtration applications, connecting beam 4 serves as a high-pressure resistant support frame, and its hydrodynamic profile prevents contaminants from accumulating in dead zones on the back side of the component, preventing contaminant deposition and microbial growth. This significantly improves the cleanliness and lifespan of the filter element, making it suitable for precision filtration of biopharmaceuticals or high-viscosity fluids.

[0055] In this specific embodiment, the aim is to verify the significant advantages of streamlined cross-sections in reducing flow resistance and eliminating shadows. Specifically, the total thickness of the substrate 1 is 40 μm, the cross-section of the connecting beam 4 is teardrop-shaped with a thickness of 5 μm, the upper surface of the reinforcing structure is located 5 μm below the first surface, the maximum width of the cross-section is 10 μm, the length is 30 μm, the radius of curvature of the leading edge of the flow-facing side is 5 μm, and the radius of curvature of the trailing edge of the flow-reversing side is 0.5 μm.

[0056] Compared to rectangular cross-section beams, the teardrop design utilizes the fluid's adhesion effect. As the slurry flows through connecting beam 4, it adheres closely to the surface and rapidly converges at the tip, eliminating low-pressure cavities (dead zones) on the back side. This means the space below connecting beam 4 can be fully filled with slurry, preventing strong shadows on the corresponding positions of the printed lines.

[0057] In this embodiment, the cross-sectional area of ​​the connecting beam 4 is non-uniformly distributed along its length across the main flow channel. The connecting beam 4 has a first cross-sectional area at its root region connecting to the inner wall of the main flow channel, and a second cross-sectional area in the middle region of the connecting beam 4, and the first and second cross-sectional areas are not equal. Specifically, the cross-sectional area of ​​the connecting beam 4 decreases sequentially from the end near the inner wall of the main flow channel to the end near the middle of the connecting beam 4.

[0058] The connection between the connecting beam 4 and the inner wall of the main flow channel is provided with a chamfer structure. The chamfer structure is either a rounded chamfer transition structure or an elliptical chamfer transition structure. The chamfer structure is designed to maximize the stress dispersion effect without excessively occupying the fluid channel area.

[0059] Ordinary straight-walled beams form a 90-degree right angle at their connection with the borehole wall. When subjected to scraper compaction or mesh tension, this right angle becomes a peak point of stress concentration, making it highly susceptible to fatigue crack initiation. By employing a variable cross-section structure (larger at the root and smaller in the middle) or a rounded / elliptical chamfer transition, the mechanical stress flow lines can be smoothly transferred from connecting beam 4 to the inner wall of the main flow channel, significantly reducing the stress concentration factor and extending the life of the mesh.

[0060] In this specific embodiment, the aim is to verify the improvement in structural lifespan caused by the variable cross-section root. Specifically, the main body width of the connecting beam 4 is 10μm, and the root design adopts an elliptical arc chamfer transition structure with a major semi-axis of 8μm and a minor semi-axis of 4μm. The right-angle connection between the connecting beam 4 and the inner wall of the main flow channel is usually the peak point of stress concentration. After introducing the elliptical arc transition structure, the stress flow lines become smoother, and the stress concentration coefficient is significantly reduced. This makes it less likely for cracks to initiate at the root of the screen when subjected to high-frequency impact from the scraper or high-tension mesh stretching, thereby greatly extending its service life.

[0061] The main axis of the connecting beam 4 is provided with a guiding angle relative to the normal direction of the first surface of the base 1. The guiding angle is the angle between the main axis of the connecting beam 4 and the normal direction of the first surface of the base 1. Specifically, the value range of the guiding angle is 15°≤θ≤30°.

[0062] When the fluid flow direction is from left to right, the main axis of the connecting beam 4 is inclined downward from left to right. That is, the guide angle is used to make the front surface of the connecting beam 4 conform to the incoming flow direction of the external fluid shear source (such as a scraper) to generate a downward fluid component force.

[0063] In another specific embodiment, the connecting component is a connecting mesh, with its two ends fixedly connected to the two inner sidewalls opposite to the main flux channel, and the flow-facing surface of the connecting mesh is provided with multiple point-like microfluidic interference components.

[0064] When the hollow connection structure includes multiple connection components, the size of the mesh of the multiple connection meshes arranged sequentially from top to bottom along the depth direction of the main flow channel decreases sequentially.

[0065] It should be noted that the structure of the connecting components is not limited to connecting beam 4 and connecting mesh.

[0066] In traditional high-speed printing, the main flow channel often experiences bridging due to the high viscosity of the ink, preventing air from escaping from the bottom of the tank and forming cavitation. This embodiment utilizes a flow field control structure to pre-shear the ink into a low-viscosity fluid, allowing it to instantly wet and fill the main flow channel like a low-surface-tension liquid, thus eliminating printing voids.

[0067] Specifically, the main flow channel includes a receiving cavity section 6 and a throttling throat section 7 connected sequentially from top to bottom. At the same location, the cross-sectional dimension of the receiving cavity section 6 is larger than that of the throttling throat section 7. In this embodiment, the receiving cavity section 6 is located on the fluid inlet side, and the throttling throat section 7 constitutes the minimum flow resistance section for fluid passage, which is used to limit the metering flow of the fluid.

[0068] In this embodiment, the main flux channel has a stepped structure. The flow field control structure can disturb and activate the fluid retention layer located in the abrupt change zone of the main flux channel's cross-section, prompting the fluid to fill the main flux channel. Specifically, the flow field control structure can induce the fluid to generate a secondary flow with a vertical momentum component. This secondary flow is configured to be injected into the interior of the main flux channel to disturb and activate the fluid retention layer located in the abrupt change zone of the main flux channel's cross-section, breaking the fluid stagnation at the corner of the step. This ensures that the slurry in the main flux channel is in a rheologically active state, prompting the fluid to rapidly replace the gas in the main flux channel at a low viscosity, thereby improving the volumetric filling rate of the main flux channel.

[0069] When the hollow connection structure includes one connection component, the connection component is disposed in the receiving cavity 6; when the hollow connection structure includes multiple connection components, all connection components are disposed sequentially from top to bottom in the receiving cavity 6, or at least one connection component is disposed in both the receiving cavity 6 and the throttling throat section 7.

[0070] When all the connecting components are arranged sequentially from top to bottom in the receiving cavity 6, there is a preset re-convergence gap between the bottom surface of the bottom connecting component and the inlet plane of the throttling throat section 7, that is, the bottom surface of the bottom connecting component is suspended above the inlet of the throttling throat section 7.

[0071] The connecting beams 4 of the connecting components located in different depth planes or different channel sections have different structural characteristics: In screen printing applications, in one embodiment, the distribution density of the connecting beams 4 of the connecting components located in the receiving cavity section 6 is lower than the distribution density of the connecting beams 4 of the connecting components located in the throttling throat section 7. The sparse layout in the upper layer retains the largest fluid channel cross-section, allowing high-viscosity ink to quickly fill the receiving cavity with minimal resistance, solving the problem of insufficient ink supply under high-speed printing. The dense layout in the lower layer cuts the fluid into fine streams, eliminates large-scale turbulence, ensures a high degree of uniformity in the output flow field, thereby improving the edge smoothness of the printed lines.

[0072] In screen printing applications, another embodiment is, as follows: Figure 16 and Figure 17 As shown, the connecting components are only located in the receiving cavity section 6. The connecting beam 4 of the connecting component located away from the receiving cavity section 6 has a structure with first fluid dynamic characteristics, while the connecting beam 4 of the connecting component located near the throttling throat section 7 has a structure with second fluid dynamic characteristics. The structure with first fluid dynamic characteristics is a blunt-headed shape with a wide cross-section, such as a diamond shape, focusing on optimizing mechanical strength. The structure with second fluid dynamic characteristics is a streamlined shape with a narrow cross-section and a pointed tail, such as a teardrop shape, focusing on optimizing fluid dynamic rectification. The main function of the upper connecting beam 4 is to withstand the macroscopic pressure of the scraper and prevent mesh deformation; the main function of the lower connecting beam 4 is to perform secondary rectification of the turbulent flow after passing through the upper connecting beam 4, eliminating microscopic shadows.

[0073] Multiple parallel main flow channels are provided on the substrate 1. The two connecting components at the relative positions of two adjacent main flow channels are staggered to prevent the formation of through stress concentration lines on the substrate 1, thereby improving the fatigue fracture resistance of the overall structure.

[0074] Example 1.1 provides a microporous fluid control component integrated into a mesh with an embedded connecting beam 4, which aims to solve the problems of increased local flow resistance and flow field shadowing effect caused by the introduction of the connecting beam 4.

[0075] The microporous fluid control component is constructed as a multi-layer structure in the thickness direction, including a first surface layer (S layer, i.e., doctor blade surface layer, with a thickness of 10μm), an intermediate layer (L layer, with a thickness of 10μm), and a second surface layer (P layer, i.e., printing surface layer, with a thickness of 20μm).

[0076] The central gradient zone 2 corresponds to the transition area between the main gate and the fine gate, and its length is 200 μm. Within this zone, the channel spacing (aperture width) on the first surface gradually changes from 45 μm to 60 μm; the channel spacing in the interlayer is the same as on the first surface, but it is provided with connecting beams 4 with a width of 8 μm and a spacing of 40 μm; the channel spacing (aperture width) on the second surface gradually changes from 15 μm to 30 μm. The connecting beams 4 can be installed at full depth or partially, and they span the channel sidewalls to provide structural rigidity.

[0077] The non-gradient region 3 corresponds to the fine grid channel region with a single aperture. The channel spacing on the first surface is 45 μm, the spacing of the intermediate layer is the same as that on the first surface, and the channel spacing on the second surface is 15 μm. There are no connecting beams 4 inside the non-gradient region 3 of the main flux channel, and it is in a fully transparent state.

[0078] The flow field control subsystem of the first surface employs point-like microfluidic interference components, arranged in an array, specifically a staggered arrangement. This means that along a predetermined tangential flow direction, the geometric center of each subsequent row of point-like microfluidic interference components lies on the projection line of the gap between the preceding row, forcing periodic lateral deflections of the fluid streamlines and inducing a secondary flow component perpendicular to the flow direction. The cross-sectional profile of each point-like microfluidic interference component includes a frontal end with a first radius of curvature and a backal end with a second radius of curvature, wherein the first radius of curvature is larger than the second radius of curvature (e.g., teardrop shape) to minimize fluid flow resistance. The height of each point-like microfluidic interference component is 5μm~8μm, the length is 15μm, and the maximum width is 8μm. This height value is configured to be greater than the viscous substrate thickness of the target silver paste at high shear rates, thereby ensuring that the point-like microfluidic interference components can effectively capture momentum in the flow region.

[0079] This embodiment employs a differentiated density distribution strategy: In the central gradient region 2, the distribution density of the microfluidic interference components 5 on the first surface is set to a higher value (e.g., surface coverage 20-40%). The high-density array of microfluidic interference components 5 provides a stronger shear-thinning effect to offset the additional flow resistance introduced by the connecting beam 4 in this region. In the non-gradient region 3, the distribution density of the microfluidic interference components 5 on the first surface is set to a standard value (e.g., surface coverage 10-15%). Through compensation, short lines are avoided, and the consistency of height in different regions is ensured. This uniformity of the overall three-dimensional morphology can effectively improve the overall photoelectric conversion efficiency of the photovoltaic cell.

[0080] The upstream surface of connecting beam 4 is equipped with multiple single-row, point-like microfluidic interference components to induce localized microturbulence above connecting beam 4. Utilizing momentum exchange within the fluid boundary layer, this accelerates fluid flow across the surface of connecting beam 4, thereby eliminating the low-pressure wake region on the downstream side of connecting beam 4 and compensating for flow resistance losses. The point-like microfluidic interference components have a circular cross-section with a diameter of 4 μm and a height of 3 μm to 5 μm.

[0081] Example 1.2 provides an advanced variant design that utilizes topological asymmetry to induce strong vertical convection, particularly suitable for thixotropic fluid printing or cross-flow filtration applications where surface deposition is prone to occur, where extremely high mixing uniformity is required. The difference between this example and Example 1.1 lies only in the microstructure and arrangement logic of the flow field control subsystem on the first surface.

[0082] The flow field control subsystem of the first surface employs a strip-shaped microfluidic interference component, which includes two extension arms of different lengths. The two extension arms are a long arm and a short arm, for example, the long arm spans 2 / 3 of the width of the first surface, and the short arm spans 1 / 3 of the width of the first surface.

[0083] A staggered arrangement is adopted: the tips of the strip-shaped microfluidic interference components in any two adjacent sets of second flow field control components are staggered. That is, the tips of the strip-shaped microfluidic interference components in two adjacent sets of second flow field control components (i.e., the connection point of the long arm and the short arm) are not on a straight line, but are offset left and right alternately along the preset tangential flow direction. For example, the first half of the cycle adopts "left long and right short", and the second half of the cycle adopts "left short and right long". Setting 5 to 10 strip-shaped microfluidic interference components constitutes one half cycle, that is, each second flow field control component includes 5 to 10 strip-shaped microfluidic interference components.

[0084] The width of the strip-shaped microfluidic interference component is 5μm and the height is 5μm~8μm. The spacing between two adjacent strip-shaped microfluidic interference components in each second flow field control component is 15μm~20μm. The included angle between the two extended arms of the strip-shaped microfluidic interference component is 90°~120°, and the tip of the included angle points downstream of the fluid.

[0085] In Example 1.1, the point-like microfluidic interference component used on the first surface generates local, random wake vortices, and fluid mixing mainly occurs in a small area behind the column.

[0086] In Example 1.2, the strip-shaped microfluidic interference component used on the first surface utilizes the transverse pressure gradient generated by the asymmetric ridge structure to induce two Dean vortices of opposite rotation and unequal intensity in the fluid. By periodically changing the direction of the ridges' intersection, the position of the vortex center on the fluid cross-section continuously changes. This forces the fluid trajectory to fold and stretch in three-dimensional space, achieving exponential mixing throughout the fluid domain.

[0087] In the field of screen printing: During the printing process, the aforementioned flipping and circulating mechanism can entrain the low-shear, high-viscosity fluid close to the surface of the substrate 1 into the high-flow-rate zone above, while simultaneously bringing the high-shear, low-viscosity fluid above to the surface. This forced full-layer mixing eliminates viscosity stratification within the fluid, ensuring that the paste entering the main flux channel has highly uniform rheological properties, significantly improving the consistency of printing and filling.

[0088] In the field of cross-flow filtration: During cross-flow filtration, the aforementioned helical vortex generates a significant hydrodynamic lift component on the membrane surface. This lift continuously strips away particles or gel layers attempting to deposit around the membrane pores and carries them back into the main fluid. This mechanism constitutes a passive surface self-cleaning system, effectively suppressing the formation of concentration polarization layers and filter cake layers, and significantly delaying the decline in filtration flux.

[0089] The structure in this embodiment can be manufactured using processes such as multilayer electroforming, laser etching, nanoimprinting, or 3D printing. The materials used are not limited to nickel or nickel alloys, but can also be extended to stainless steel, polymer materials, ceramic materials, or their composites, as long as the flow field control structure is integrated on its surface.

[0090] In one embodiment, the substrate 1 adopts a metal-polymer composite structure, the first surface layer and the flow field control structure are made of photosensitive polymer, and the intermediate layer and the second surface layer are made of nickel alloy. In another embodiment, the substrate 1 adopts a metal-polymer composite structure, the first surface layer, the intermediate layer and the second surface layer are nickel alloy, and after electroforming, the surface is coated with polymer material to form the flow field control structure.

[0091] The polymer material can be selected from photosensitive polyimide, photocurable polyurethane, photosensitive epoxy resin, etc. Microscopic fluid interference components with specific three-dimensional morphologies can be directly fabricated on the polymer layer using techniques such as grayscale mask exposure, multiple exposure, or laser direct writing.

[0092] The specific structural forms of the substrate 1 encompass, but are not limited to, the following implementation forms and combinations thereof. Specifically, the first type uses a fully open metal wire mesh as the substrate skeleton: This type of substrate 1 is composed of a single layer or multiple layers of fully open metal wire mesh. Fully Through Type: The interior of the main flux channel is an unobstructed free space. Embedded Reinforced Type: An embedded, hollowed-out connecting structure is integrally set within the interior space of the main flux channel (especially in the stress concentration gradient region). The flow field control structure can be formed either in the solid region on the surface of the fully open metal wire mesh or on the flow-facing surface of the embedded, hollowed-out connecting structure.

[0093] The second type uses a mesh / mesh as the substrate framework: Mesh-polymer composite type: The substrate 1 is composed of a mesh layer as the framework and a polymer layer (such as a photosensitive emulsion layer) as the pattern layer. The emulsion layer fills in the undulations of the mesh, providing a smooth solid surface to support the microfluidic interference component 5. Mesh-fully open metal mesh composite type: The substrate 1 is composed of a mesh layer and a fully open layer (such as an ultra-thin nickel plate) stacked together, utilizing the fully open layer to provide high-precision aperture control and a carrier for the microfluidic interference component.

[0094] Example 2: This embodiment provides a fluid processing assembly, including a shearing mechanism and a microporous fluid control component, wherein the shearing mechanism is used to cooperate with a first surface.

[0095] In this specific embodiment, as Figure 18 As shown, the fluid processing assembly is used for screen printing, the microporous fluid control component is the printing screen 8, and the shearing mechanism is a squeegee. The printing screen 8 is the core structure of the fluid processing assembly, which also includes a flexible mesh area 10 and a rigid frame 11. The flexible mesh area 10 surrounds and connects to the periphery of the printing screen 8, while the rigid frame 11 is used to fix and tension the flexible mesh area 10, ensuring the printing screen 8 is under a preset tension. Specifically, the printing screen 8 and the flexible mesh area 10 are connected via an adhesive area 9.

[0096] Specifically, the rigid frame 11 has a frame size of 500mm×500mm, and the printing screen 8 has a size of 200mm×200mm (which can be adjusted according to the size of the battery cell). The printing screen 8 is integrally formed using nickel or nickel alloy through a multi-layer electroforming process.

[0097] In another specific embodiment, the fluid handling assembly is used for cross-flow filtration, the microporous fluid control element is a precision filter membrane, and the shearing mechanism is a pumping device for generating tangential flow. In cross-flow filtration mode, the microfluidic interference element 5 on the first surface acts as a turbulence promoter, using the generated tangential eddies to roll the deposits back into the main fluid, thereby suppressing the formation of the filter cake layer and maintaining high flux.

[0098] This specification 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. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A microporous fluid control component, characterized in that, The system includes a matrix and a flow field control structure. The matrix has a first surface for receiving fluid and interacting with an external shear flow field, and a second surface for discharging fluid. The matrix has a plurality of main flux channels penetrating the first and second surfaces. The flow field control structure includes a plurality of flow field control subsystems. The flow field control subsystems are provided in the solid region of the first surface and / or on the inner sidewall of the main flux channels. The flow field control subsystems include a plurality of microfluidic interference components with preset three-dimensional geometric shapes.

2. The microporous fluid control component according to claim 1, characterized in that, It also includes a hollowed-out connection structure, the two ends of which are respectively connected to the two inner sidewalls opposite to the main flow channel.

3. The microporous fluid control component according to claim 2, characterized in that, The flow field control subsystem is provided on the frontal surface of the hollowed-out connecting structure.

4. The microporous fluid control component according to claim 3, characterized in that, The microfluidic interference component is a point-like microfluidic interference component. The cross-section of the point-like microfluidic interference component includes a front end with a first radius of curvature and a back end with a second radius of curvature. The first radius of curvature is greater than or equal to the second radius of curvature. The flow field control subsystem includes multiple point-like microfluidic interference components that are discretely distributed. Alternatively, the microfluidic interference component is a strip-like microfluidic interference component. The strip-like microfluidic interference component has a herringbone or V-shaped ridge structure. The flow field control subsystem includes multiple strip-like microfluidic interference components arranged sequentially along a preset tangential flow direction. The tips of the strip-like microfluidic interference components all point towards or away from the preset tangential flow direction.

5. The microporous fluid control component according to claim 4, characterized in that, The flow field control subsystem includes multiple rows of first flow field control components arranged sequentially along a preset tangential flow direction. Each first flow field control component includes multiple point-like microfluidic interference components arranged sequentially along a direction perpendicular to the preset tangential flow direction. The point-like microfluidic interference components in any two adjacent rows of first flow field control components are staggered. Alternatively, the flow field control subsystem includes multiple sets of second flow field control components arranged sequentially along a preset tangential flow direction. Each second flow field control component includes multiple strip-like microfluidic interference components arranged sequentially along the preset tangential flow direction. The tips of the strip-like microfluidic interference components in any two adjacent sets of second flow field control components are staggered.

6. The microporous fluid control component according to claim 2, characterized in that, The hollow connection structure includes one or more connection components arranged sequentially from top to bottom along the depth direction of the main flow channel, and the two ends of the connection component are fixedly connected to the two inner sidewalls opposite to the main flow channel.

7. The microporous fluid control component according to claim 6, characterized in that, The connecting assembly includes multiple connecting beams arranged at equal intervals along the length of the main flow channel. Both ends of each connecting beam are fixedly connected to two inner sidewalls opposite to the main flow channel. The upper part of the cross-section of the connecting beam has a diversion section facing upstream of the fluid, and the lower part has a confluence section facing downstream of the fluid. The cross-section of the connecting beam is a streamlined structure or a non-rectangular polygonal structure.

8. The microporous fluid control component according to claim 7, characterized in that, When the hollow connection structure includes multiple connection components, the total flow cross-sectional area of ​​the upper connection component in any two adjacent connection components is greater than the total flow cross-sectional area of ​​the lower connection component, and the maximum width of the cross-section of the upper connection beam in any two adjacent connection components is greater than the maximum width of the cross-section of the lower connection beam; the width of the cross-section of the connection beam decreases sequentially from top to bottom.

9. The microporous fluid control component according to claim 6, characterized in that, The main flow channel includes a receiving cavity section and a throttling throat section connected sequentially from top to bottom. At the same location, the cross-sectional dimension of the receiving cavity section is larger than the cross-sectional dimension of the throttling throat section. When the hollow connection structure includes one connecting component, the connecting component is disposed in the receiving cavity section. When the hollow connection structure includes multiple connecting components, all the connecting components are sequentially disposed in the receiving cavity section from top to bottom. Alternatively, at least one connecting component is disposed in both the receiving cavity section and the throttling throat section.

10. A fluid processing assembly, characterized in that, The device includes a shearing mechanism and a microporous fluid control element as described in any one of claims 1-9, wherein the shearing mechanism is configured to engage with the first surface; the microporous fluid control element is a printing screen, and the shearing mechanism is a doctor blade; or, the microporous fluid control element is a precision filter membrane, and the shearing mechanism is a pumping device for generating tangential flow.

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