Uniform liquid supply device and method suitable for multi-needle electrostatic airflow coupling spinning

Abstract

The present application relates to a kind of uniform liquid supply device and method suitable for multi-needle electrostatic airflow coupling spinning, belong to spinning equipment technical field.The device includes shell, is arranged with distribution grid plate inside, is separated into first distribution cavity and second distribution cavity;Distribution grid plate surface array distribution hole, aperture and transverse spacing gradient change according to flow direction;Liquid inlet portion adopts variable diameter pipe, includes inlet section, throat section and outlet section, forms contraction-expansion flow channel;The bottom surface of first distribution cavity is provided with arc flow guide piece array, and the inner wall of second distribution cavity is provided with wave-shaped flow guide rib;Shell adopts split type sealing structure, is embedded sealing ring by annular groove and boss cooperation, and double seal is arranged in distribution grid plate and cavity top;Liquid outlet portion is distributed liquid outlet along axial direction, and is integrated with liquid release plug.The present application significantly improves the production efficiency and product quality of electrostatic airflow coupling spinning as a whole, and is suitable for large-scale nanofiber preparation.

Description

Technical Field

[0001] This invention belongs to the technical field of spinning equipment, specifically relating to a uniform liquid supply device and method suitable for multi-needle electrostatic airflow coupling spinning. Background Technology

[0002] Electrospinning is one of the main methods for preparing nanofibers. Its core is to make a charged spinning solution or melt flow and deform in an electric field, and then solidify it through solvent evaporation or melt cooling to obtain fibrous materials.

[0003] Air-jet spinning technology utilizes high-speed airflow to ultrafinely stretch a fine stream of spinning solution and evaporate the solvent to prepare micro / nanofibers, exhibiting higher spinning efficiency than electrospinning. Furthermore, the fine stream of spinning solution, due to the turbulent shearing effect of the high-speed airflow field inside the spinning box, forms a three-dimensional coiled shape and becomes entangled. This method is simple, the conditions are easy to control, and it can be mass-produced. It can process any polymer solution, overcoming the requirements of existing meltblown technology regarding the thermoplasticity and high melt flowability of raw materials, thus possessing universal applicability.

[0004] In recent years, electrostatic airflow coupling spinning has consistently employed single-nozzle spinning equipment and liquid supply devices, resulting in an open spinning environment and low production rates that cannot meet the requirements of large-scale production. Therefore, there is an urgent need to design a uniform liquid supply device for multi-needle electrostatic airflow coupling spinning. Summary of the Invention

[0005] This invention overcomes the shortcomings of the prior art and provides a uniform liquid supply device and method suitable for multi-needle electrostatic airflow coupling spinning.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a uniform liquid supply device suitable for multi-needle electrostatic airflow coupling spinning, comprising:

[0007] The shell has an axially continuous main cavity inside;

[0008] A liquid distribution grid plate is horizontally fixed in the middle of the main cavity, dividing the main cavity into a lower first distribution cavity and an upper second distribution cavity; the surface of the liquid distribution grid plate is provided with an array of liquid distribution holes, the diameter of the liquid distribution holes is 0.4-1.6mm, the horizontal lateral spacing between adjacent liquid distribution holes is 8-32mm, and the horizontal longitudinal spacing is 3-6mm.

[0009] The liquid inlet section includes a reducing pipe and a flange interface. The reducing pipe includes an inlet section, a throat section and an outlet section connected in sequence. The inlet section is connected to an external liquid supply pipeline through the flange interface. The outlet section extends to the bottom of the first distribution chamber. The inner diameter of the throat section is smaller than that of the inlet section 511 and the outlet section 513, and the inner wall is inlaid with a tungsten carbide wear-resistant ring.

[0010] The liquid outlet section includes a liquid outlet interface distributed along the axial direction of the housing and a liquid outlet connector threaded to the liquid outlet interface.

[0011] In a preferred embodiment of the present invention, the liquid distribution grid is divided into a first region, a second region, and a third region along the fluid flow direction;

[0012] The gradient changes of the separating orifices are as follows: in the first region, the orifice diameter is 0.4-0.6 mm and the horizontal spacing is 8-12 mm; in the second region, the orifice diameter is 0.8-1.2 mm and the horizontal spacing is 16-24 mm; and in the third region, the orifice diameter is 1.2-1.6 mm and the horizontal spacing is 24-32 mm.

[0013] In a preferred embodiment of the present invention, the volume ratio of the first distribution cavity to the second distribution cavity is 2.5:1 to 4:1.

[0014] In a preferred embodiment of the present invention, the shrinkage ratio from the inlet section to the throat section of the reducer is 1:1.8 to 1:2.2, the expansion ratio from the throat section to the outlet section is 1:1.6 to 1:1.8, the throat section length is 35-45mm, and the wear-resistant ring thickness is 0.5-1.0mm.

[0015] In a preferred embodiment of the present invention, a guide plate is fixed on the bottom surface of the first distribution cavity. The guide plate is an array of arc-shaped metal plates with a height of 3-5 mm and a thickness of 1-2 mm.

[0016] The guide vanes are located in the first, second, and third regions of the dispensing grid along the direction of the spinning solution flow. The guide vanes located in the first region have a spacing of 12-18 mm and a radius of curvature of 6-8 mm. The guide vanes located in the second region have a spacing of 20-24 mm and a radius of curvature of 10-12 mm. The guide vanes located in the third region have a spacing of 28-32 mm and a radius of curvature of 14-16 mm.

[0017] In a preferred embodiment of the present invention, a guide rib is fixed on the inner wall of the second distribution cavity along the flow direction of the spinning solution; the guide rib is arranged longitudinally, with its axis parallel to the flow direction of the spinning solution, covering the axial length of the second distribution cavity; the top profile of the guide rib is a continuous wavy line, and the vertical amplitude of the wave crest and trough gradually increases from bottom to top; the surface of the guide rib has a longitudinal groove with a depth of 0.6-0.8 mm.

[0018] In a preferred embodiment of the present invention, the housing includes a first housing and a second housing, which are coupled by a sealing assembly to form a main cavity inside; the sealing assembly includes an annular groove disposed on the inner surface of the first housing, an annular boss disposed on the inner surface of the second housing, and a first sealing ring embedded in the annular groove; the annular groove and the annular boss are coupled.

[0019] In a preferred embodiment of the present invention, the liquid distribution grid is fixed to the top of the first distribution chamber by bolts; a second sealing ring is provided between the liquid distribution grid and the top of the first distribution chamber.

[0020] In a preferred embodiment of the present invention, a drain plug extending into the first distribution chamber is provided on the first housing.

[0021] Another technical solution provided by the present invention: a uniform liquid supply method suitable for multi-needle electrostatic airflow coupled spinning, based on the above-mentioned uniform liquid supply device, comprising:

[0022] S1. Connect the flange interface to the external high-pressure liquid supply pump, and connect the liquid outlet connector to the multi-needle electrostatic spinning head through a pressure-resistant hose;

[0023] S2. Turn on the high-pressure liquid supply pump and introduce the spinning solution to the bottom of the first distribution chamber; the spinning solution enters the second distribution chamber through the liquid distribution grid plate and is evenly distributed to the multi-needle electrostatic spinning head through the liquid outlet connector.

[0024] S3. After spinning is complete, turn off the high-pressure liquid supply pump, open the drain plug to drain the residual liquid, and flush the separator hole with acetone in the reverse direction.

[0025] This invention addresses the shortcomings of the prior art and has the following beneficial effects:

[0026] (1) The present invention provides a uniform liquid supply device suitable for multi-needle electrostatic airflow coupling spinning, including a housing, a liquid distribution grid plate disposed inside the housing, a first distribution chamber located below the liquid distribution grid plate and a second distribution chamber located above the liquid distribution grid plate, a liquid inlet disposed on the side end face of the housing and a liquid outlet disposed at the bottom of the housing. Through the gradient change of the diameter and spacing of the liquid distribution holes, the contraction and expansion of the variable diameter tube flow channel, and the guide plate and guide vane, the spinning liquid enters from the variable diameter tube, flows upward from the bottom of the first distribution chamber, flows through the liquid distribution grid plate into the second distribution chamber, and flows out from the liquid outlet. This realizes the pressure-driven liquid supply method from bottom to top, and solves the problems of large flow fluctuation and inconsistent fiber diameter caused by eddy current under high pressure in traditional devices.

[0027] (2) The distribution holes on the surface of the distribution grid plate gradually change in diameter and lateral spacing according to the flow direction; the inlet section of the variable diameter pipe narrows, the throat section is inlaid with a tungsten carbide wear-resistant ring, and the outlet section expands, forming a gradient flow velocity and pressure. The narrowing of the inlet section of the variable diameter pipe accelerates the flow of spinning solution, the throat section forms a local high pressure, and the expansion of the outlet section slows down the flow velocity, so that the spinning solution enters the first distribution chamber at a stable pressure. The small diameter and closely spaced distribution holes on the distribution grid plate suppress the flow accumulation caused by high-speed flow, avoiding the formation of a high-pressure zone in the central area due to excessive flow velocity; the large diameter and widely spaced distribution holes compensate for the pressure attenuation, maintain the flow in the edge area, and make the pressure distribution of the spinning solution on the surface of the distribution grid plate more uniform, and significantly reduce the difference in flow rate of multi-needle liquid supply. Compared with the traditional device, which has fixed hole diameter and abrupt changes in flow channel, resulting in overload in the central area and insufficient flow at the edge, and accumulation of fiber membrane thickness in the center and excessive thinness at the edge, the present invention improves the lateral thickness uniformity of the fiber membrane and reduces the fiber diameter fluctuation caused by uneven liquid supply.

[0028] (3) An array of arc-shaped guide vanes with varying curvature is provided at the bottom of the first distribution chamber, and wave-shaped guide ribs with varying amplitude are provided on the inner wall of the second distribution chamber. The arc-shaped structure of the guide vanes generates local vortices through curvature changes, breaking up the initially high-speed flowing liquid and suppressing longitudinal stratification; the guide ribs guide the liquid to flow in a spiral manner by gradually increasing amplitude from bottom to top, disrupting boundary layer separation near the outlet, while the surface grooves reduce frictional resistance, so that the spinning solution forms a stable laminar flow in the first and second distribution chambers, reducing pressure fluctuations at the inlet of the dispensing hole and improving the uniformity of the flow field. Compared with the uneven flow distribution and strip-shaped thickness differences in the fiber membrane caused by vortices and stratification in traditional smooth cavities, this invention further reduces fiber diameter dispersion, enhances equipment operating stability, and reduces downtime and maintenance caused by flow field turbulence.

[0029] (4) On the one hand, the gradient between the variable diameter pipe and the distribution hole provides a basic pressure field for the guide vanes and guide ribs, ensuring a uniform flow distribution of liquid on the surface of the distribution grid. On the other hand, the guide vanes and guide ribs actively regulate the flow field to eliminate local eddies or stratification caused by the gradient between the variable diameter pipe and the distribution hole. The high-pressure liquid accelerated by the variable diameter pipe drives the liquid to flow upward from the bottom of the first distribution chamber. The guide vanes eliminate the initial turbulence, and the guide ribs force distribution, ultimately achieving a bottom-up pressure-driven liquid supply method. Attached Figure Description

[0030] 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 some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1This is a schematic diagram of a uniform liquid supply device suitable for multi-needle electrostatic airflow coupling spinning;

[0032] Figure 2 This is a cross-sectional view of a uniform liquid supply device suitable for multi-needle electrostatic airflow coupling spinning;

[0033] Figure 3 This is a schematic diagram of the liquid inlet section;

[0034] Figure 4 This is a schematic diagram of the main cavity structure;

[0035] In the diagram: 1. Shell; 2. Liquid distribution grid; 3. First distribution chamber; 4. Second distribution chamber; 5. Liquid inlet; 6. Liquid outlet; 7. Guide vane; 8. Guide rib; 11. First shell; 12. Second shell; 13. First sealing ring; 21. Liquid distribution hole; 22. First region; 23. Second region; 24. Third region; 25. Second sealing ring; 51. Reducer; 52. Flange interface; 53. Tungsten carbide wear-resistant ring; 61. Liquid outlet interface; 62. Liquid outlet connector; 111. Annular groove; 112. Liquid drain plug; 121. Annular boss; 511. Inlet section; 512. Throat section; 513. Outlet section. Detailed Implementation

[0036] 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.

[0037] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0038] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] Exemplary device:

[0041] like Figure 1-3 As shown, a uniform liquid supply device suitable for multi-needle electrostatic airflow coupling spinning includes:

[0042] The housing 1 has an axially penetrating main cavity inside;

[0043] The liquid distribution grid plate 2 is horizontally fixed in the middle of the main cavity, dividing the main cavity into the lower first distribution cavity 3 and the upper second distribution cavity 4; the surface of the liquid distribution grid plate 2 is provided with an array of liquid distribution holes 21, the diameter of the liquid distribution holes 21 is 0.4-1.6mm, the horizontal lateral spacing between adjacent liquid distribution holes is 8-32mm, and the horizontal longitudinal spacing is 3-6mm.

[0044] The liquid inlet section 5 includes a reducing pipe 51 and a flange interface 52. The reducing pipe 51 includes an inlet section 511, a throat section 512 and an outlet section 513 connected in sequence. The inner diameter of the throat section 512 is smaller than that of the inlet section 511 and the outlet section 513. The inlet section 511 is connected to an external liquid supply pipeline through the flange interface 52. The inner wall of the throat section 512 is inlaid with a tungsten carbide wear-resistant ring 53. The outlet section 513 extends to the bottom of the second distribution chamber 4.

[0045] The liquid outlet 6 includes a liquid outlet interface 61 distributed along the axial direction of the housing 1 and a liquid outlet connector 62 connected to the liquid outlet interface 61.

[0046] In multi-needle electrospinning, fluctuations in the liquid supply pressure can lead to uneven liquid output rates at each needle, causing lateral thickness fluctuations in the fiber membrane. Traditional multi-needle electrospinning uses a constant-rate liquid supply mode, resulting in reduced liquid output at the distal needles due to pressure attenuation, and a significant decrease in the thickness at the fiber membrane edge. In the exemplary device, the array of distributing holes 21 on the distributing grid plate 2 covers the spacing range of the multiple liquid outlet connectors 62, suppressing local pressure drop through the matching of hole diameter and spacing; the variable diameter tube 51 forms a gradient contraction and expansion structure, utilizing the Venturi effect to compensate for pressure loss, reducing liquid supply pressure fluctuations at the distal needles, thereby reducing the relative error in fiber membrane thickness.

[0047] like Figure 4 As shown, along the fluid flow direction, the liquid distribution grid plate 2 is divided into a first region 22, a second region 23 and a third region 24; the first region 22 is 0-30% of the length from the liquid inlet end, the second region 23 is 30-70% of the length from the liquid inlet end, and the third region 24 is 70-100% of the length from the liquid inlet end.

[0048] The gradient changes of the separating holes 21 are as follows: in the first region 22, the hole diameter is 0.4-0.6 mm and the horizontal spacing is 8-12 mm; in the second region 23, the hole diameter is 0.8-1.2 mm and the horizontal spacing is 16-24 mm; and in the third region 24, the hole diameter is 1.2-1.6 mm and the horizontal spacing is 24-32 mm.

[0049] Excessive flow velocity in the proximal region of the dispensing orifice 21 leads to abnormal accumulation of fiber membrane thickness in the center. When the dispensing orifices 21 are uniformly distributed, the high fluid kinetic energy in the proximal region results in excessively high jet velocity. The exemplary device employs gradient partitioning of the dispensing orifices 21. In the first region, orifice diameters of 0.4-0.6 mm suppress flow velocity, and a lateral spacing of 8-12 mm increases resistance. In the second region, orifice diameters of 0.8-1.2 mm balance flow rate, and a lateral spacing of 16-24 mm optimizes laminar flow. In the third region, orifice diameters of 1.2-1.6 mm compensate for pressure attenuation, and a lateral spacing of 24-32 mm reduces turbulent superposition. By reducing flow velocity through the orifice reduction effect, fiber accumulation in the central region is minimized, thereby reducing lateral thickness fluctuations in the fiber membrane.

[0050] like Figure 2 As shown, the volume ratio of the first distribution chamber 3 to the second distribution chamber 4 is 2.5:1 to 4:1. The height of the first distribution chamber 3 is 1.8-2.2 times that of the second distribution chamber 4, and the width of the first distribution chamber 3 is 1.3-1.6 times that of the second distribution chamber 4. The increased volume of the first distribution chamber 3 provides buffer space, while the decreased volume of the pressure accumulator chamber 4 improves the pressure response speed.

[0051] like Figure 3As shown, the contraction ratio from the inlet section 511 to the throat section 512 of the reducer 51 is 1:1.8 to 1:2.2, and the expansion ratio from the throat section 512 to the outlet section 513 is 1:1.6 to 1:1.8. The length of the throat section 512 is 35-45 mm, and the thickness of the tungsten carbide wear-resistant ring 53 is 0.5-1.0 mm. The reducer 51 allows the fluid to fully develop laminar flow, reducing pressure oscillations caused by sudden changes in flow velocity, thereby reducing fiber diameter dispersion. The tungsten carbide wear-resistant ring 53 reduces the friction coefficient and suppresses eddy current formation.

[0052] like Figure 4 As shown, a guide vane 7 is fixed on the bottom surface of the first distribution cavity 3. The guide vane 7 is an array of arc-shaped metal guide vanes with a height of 3-5 mm and a thickness of 1-2 mm. The guide vanes 7 are located in the first region 22, the second region 23 and the third region 24 of the dispensing grid plate 2 along the flow direction of the spinning solution. The guide vanes 7 located at the corresponding positions in the first region 22 have a spacing of 12-18 mm and a radius of curvature of 6-8 mm. The guide vanes 7 located in the second region 23 have a spacing of 20-24 mm and a radius of curvature of 10-12 mm. The guide vanes 7 located in the third region 24 have a spacing of 28-32 mm and a radius of curvature of 14-16 mm.

[0053] The first section of the small-curvature guide vane generates strong vortices through high curvature, dispersing the high-speed fluid near the end and suppressing stratification. The second section of the transition guide vane guides the fluid to diffuse further away through medium curvature, balancing the pressure distribution. The third section of the large-curvature guide vane reduces flow resistance through low curvature, matching the large orifice diameter requirement of the liquid distribution hole 21 and improving the uniformity of pressure distribution in the first distribution chamber 3. During installation, multiple arc-shaped metal sheets are welded or riveted to a rectangular support plate at a preset spacing and curvature radius to form a guide module unit. The guide module unit is then fixed to the bottom surface of the first distribution chamber 3 with countersunk bolts, ensuring that the arc direction of the guide vane is consistent with the fluid flow direction. The contact surface between the guide module and the bottom surface of the first distribution chamber 3 is coated with solvent-resistant sealant.

[0054] like Figure 4 As shown, the inner wall of the second distribution chamber 4 is fixed with guide ribs 8 along the flow direction of the spinning solution. The guide ribs 8 are continuous wavy ribs, 2-4 mm high and 1-2 mm wide at the top, arranged longitudinally with their axis parallel to the flow direction of the spinning solution, covering the entire axial length of the second distribution chamber 4. The top profile of the guide ribs 8 is a continuous wavy line, with the vertical amplitude of the crests and troughs gradually increasing from bottom to top. The surface is machined with longitudinal grooves, 0.6-0.8 mm deep. The guide ribs 8 guide the fluid to flow in a spiral pattern through a periodic undulating structure, disrupting the boundary layer. The ribs with smaller amplitudes near the front suppress the initial eddies, while the ribs with larger amplitudes at the far end enhance longitudinal mixing.

[0055] like Figure 2As shown, housing 1 includes a first housing 11 and a second housing 12 bolted together. The first housing 11 and the second housing 12 are fitted together by a sealing assembly to form a main cavity. The sealing assembly includes an annular groove 111 on the inner surface of the first housing 11, an annular boss 121 on the inner surface of the second housing 12, and a first sealing ring 13 embedded in the annular groove 111. The first sealing ring 13 is a fluororubber sealing ring. The annular groove 111 and the annular boss 121 are fitted together. The bolt preload causes the annular boss 121 and the annular groove 111 to form a rigid contact seal. The compression deformation of the first sealing ring 13 compensates for thermal expansion and vibration deformation, blocking the leakage path.

[0056] like Figure 2 As shown, the liquid distribution grid plate 2 is fixed to the top of the first distribution chamber 3 by bolts; a second sealing ring 25 is provided between the liquid distribution grid plate 2 and the top of the first distribution chamber 3. The second sealing ring 25 is a polytetrafluoroethylene sealing ring, which distributes stress evenly and delays aging.

[0057] like Figure 1 As shown, the first housing 11 is provided with a discharge plug 112 that extends through the first distribution cavity 3.

[0058] Example 1

[0059] A uniform liquid supply device suitable for multi-needle electrostatic airflow coupling spinning, comprising:

[0060] The housing 1 has an axially penetrating main cavity inside;

[0061] The liquid distribution grid plate 2 is a rectangular metal plate with a thickness of 3mm, which is horizontally fixed in the middle of the main cavity, dividing the main cavity into a lower first distribution cavity 3 and an upper second distribution cavity 4. The surface of the liquid distribution grid plate 2 is provided with an array of liquid distribution holes 21. In the first region 22, which is 0-30% of the length from the liquid inlet end, the diameter of the liquid distribution holes 21 is 0.3mm and the horizontal spacing is 6mm. In the second region 23, which is 30-70% of the length from the liquid inlet end, the diameter of the liquid distribution holes 21 is 0.7mm and the horizontal spacing is 16mm. In the third region 24, which is 70-100% of the length from the liquid inlet end, the diameter of the liquid distribution holes 21 is 1.5mm and the horizontal spacing is 28mm. The horizontal and vertical spacing of the liquid distribution holes 21 is 3.0mm.

[0062] The liquid inlet section 5 includes a reducing pipe 51 and a flange interface 52. The reducing pipe 51 consists of an inlet section 511, a throat section 512, and an outlet section 513. The contraction ratio from the inlet section 511 to the throat section 512 is 1:2.2, and the expansion ratio from the throat section 512 to the outlet section 513 is 1:1.6. The throat section 512 is 35.0 mm long, and its inner wall is inlaid with a tungsten carbide wear-resistant ring 53 with a thickness of 0.5 mm.

[0063] The liquid outlet 6 includes a liquid outlet interface 61 distributed along the axial direction of the housing 1 and a liquid outlet connector 62 threadedly connected to the liquid outlet interface 61.

[0064] The volume of the first distribution cavity 3 is 2.5 times that of the second distribution cavity 4, the height of the first distribution cavity 3 is 1.8 times that of the second distribution cavity 4, and the width is 1.3 times that of the second distribution cavity 4.

[0065] A guide vane 7 is fixed to the bottom surface of the first distribution chamber 3. The guide vane 7 is composed of multiple arc-shaped metal guide vanes and is located in the first region 22, the second region 23, and the third region 24 of the dispensing grid plate 2 along the flow direction of the spinning solution. The guide vane 7 located in the first region 22 has a spacing of 12 mm and a radius of curvature of 6 mm. The guide vane 7 located in the second region 23 has a spacing of 20 mm and a radius of curvature of 10 mm. The guide vane 7 located in the third region 24 has a spacing of 28 mm and a radius of curvature of 14 mm. The guide vane 7 has a height of 3.0 mm and a thickness of 1.0 mm.

[0066] The inner wall of the second distribution chamber 4 is fixed with guide ribs 8 along the flow direction of the spinning solution. The guide ribs 8 are wavy ribs arranged longitudinally with their axes parallel to the flow direction of the spinning solution, covering the entire axial length of the second distribution chamber 4. The top contour of the guide ribs 8 is a continuous wavy line, and the vertical amplitude of the crests and troughs gradually increases from bottom to top. The surface of the ribs is machined with longitudinal grooves with a depth of 0.6 mm.

[0067] The housing 1 is formed by bolts connecting the first housing 11 and the second housing 12. The mating surface of the first housing 11 is provided with an annular groove 111, and the mating surface of the second housing 12 is provided with an annular boss 121. The annular groove 111 is embedded with a first sealing ring 13.

[0068] The liquid distribution grid plate 2 is fixed to the top of the first distribution chamber 3 by bolts, and a second sealing ring 25 is provided between the liquid distribution grid plate 2 and the top of the first distribution chamber 3.

[0069] The first housing 11 is provided with a discharge plug 112 that extends through the first distribution cavity 3.

[0070] Example 2

[0071] A uniform liquid supply device suitable for multi-needle electrostatic airflow coupling spinning, comprising:

[0072] The housing 1 has an axially penetrating main cavity inside.

[0073] The liquid distribution grid plate 2 is a rectangular metal plate with a thickness of 3mm, which is horizontally fixed in the middle of the main cavity, dividing the main cavity into a lower first distribution cavity 3 and an upper second distribution cavity 4. The surface of the liquid distribution grid plate 2 is provided with an array of liquid distribution holes 21. In the first region 22, which is 0-30% of the length from the liquid inlet end, the diameter of the liquid distribution holes 21 is 0.5mm and the horizontal spacing is 10mm. In the second region 23, which is 30-70% of the length from the liquid inlet end, the diameter of the liquid distribution holes 21 is 1.0mm and the horizontal spacing is 20mm. In the third region 24, which is 70-100% of the length from the liquid inlet end, the diameter of the liquid distribution holes 21 is 1.4mm and the horizontal spacing is 28mm. The horizontal and vertical spacing of the liquid distribution holes 21 is 5.0mm.

[0074] The liquid inlet section 5 includes a reducing pipe 51 and a flange interface 52. The reducing pipe 51 consists of an inlet section 511, a throat section 512, and an outlet section 513. The contraction ratio from the inlet section 511 to the throat section 512 is 1:2.0, and the expansion ratio from the throat section 512 to the outlet section 513 is 1:1.7. The throat section 512 has a length of 40.0 mm and its inner wall is inlaid with a tungsten carbide wear-resistant ring 53 with a thickness of 1.0 mm.

[0075] The liquid outlet 6 includes a liquid outlet interface 61 distributed along the axial direction of the housing 1 and a liquid outlet connector 62 threadedly connected to the liquid outlet interface 61.

[0076] The volume of the first distribution cavity 3 is 3.5 times that of the second distribution cavity 4, the height of the first distribution cavity 3 is 2.0 times that of the second distribution cavity 4, and the width is 1.5 times that of the second distribution cavity 4.

[0077] A guide vane 7 is fixed to the bottom surface of the first distribution chamber 3. The guide vane 7 is composed of multiple arc-shaped metal guide vanes and is located in the first region 22, the second region 23, and the third region 24 of the dispensing grid plate 2 along the flow direction of the spinning solution. The guide vane 7 located in the first region 22 has a spacing of 15.0 mm and a radius of curvature of 7.0 mm. The guide vane 7 located in the second region 23 has a spacing of 22.0 mm and a radius of curvature of 11.0 mm. The guide vane located in the third region 24 has a spacing of 30.0 mm and a radius of curvature of 15.0 mm. The guide vane has a height of 4.0 mm and a thickness of 2.0 mm.

[0078] The inner wall of the second distribution chamber 4 is fixed with guide ribs 8 along the flow direction of the spinning solution. The guide ribs 8 are wavy ribs arranged longitudinally with their axes parallel to the flow direction of the spinning solution, covering the entire axial length of the second distribution chamber 4. The top contour of the guide ribs 8 is a continuous wavy line, and the vertical amplitude of the crests and troughs gradually increases from bottom to top. The surface of the ribs is machined with longitudinal grooves with a depth of 0.7 mm.

[0079] The housing 1 is formed by bolts connecting the first housing 11 and the second housing 12. The mating surface of the first housing 11 is provided with an annular groove 111, and the mating surface of the second housing 12 is provided with an annular boss 121. The annular groove 111 is embedded with a first sealing ring 13.

[0080] The liquid distribution grid plate 2 is fixed to the top of the first distribution chamber 3 by bolts, and a second sealing ring 25 is provided between the liquid distribution grid plate 2 and the top of the first distribution chamber 3.

[0081] The first housing 11 is provided with a discharge plug 112 that extends through the first distribution cavity 3.

[0082] Example 3

[0083] A uniform liquid supply device suitable for multi-needle electrostatic airflow coupling spinning, comprising:

[0084] The housing 1 has an axially penetrating main cavity inside.

[0085] The liquid distribution grid plate 2 is a rectangular metal plate with a thickness of 3mm, which is horizontally fixed in the middle of the main cavity, dividing the main cavity into a lower first distribution cavity 3 and an upper second distribution cavity 4. The surface of the liquid distribution grid plate 2 is provided with an array of liquid distribution holes 21. In the first region 22, which is 0-30% of the length from the liquid inlet end, the diameter of the liquid distribution holes 21 is 0.6mm and the horizontal spacing is 12mm. In the second region 23, which is 30-70% of the length from the liquid inlet end, the diameter of the liquid distribution holes 21 is 1.2mm and the horizontal spacing is 24mm. In the third region 24, which is 70-100% of the length from the liquid inlet end, the diameter of the liquid distribution holes 21 is 1.6mm and the horizontal spacing is 32mm. The horizontal longitudinal spacing of the liquid distribution holes 21 is 6.0mm.

[0086] The liquid inlet section 5 includes a reducing pipe 51 and a flange interface 52. The reducing pipe 51 consists of an inlet section 511, a throat section 512, and an outlet section 513. The contraction ratio from the inlet section 511 to the throat section 512 is 1:1.8, and the expansion ratio from the throat section 512 to the outlet section 513 is 1:1.8. The throat section 512 has a length of 45.0 mm and its inner wall is inlaid with a tungsten carbide wear-resistant ring 53 with a thickness of 1.0 mm.

[0087] The liquid outlet 6 includes a liquid outlet interface 61 distributed along the axial direction of the housing 1 and a liquid outlet connector 62 threadedly connected to the liquid outlet interface 61.

[0088] The volume of the first distribution cavity 3 is 4.0 times that of the second distribution cavity 4, the height of the first distribution cavity 3 is 2.2 times that of the second distribution cavity 4, and the width is 1.6 times that of the second distribution cavity 4.

[0089] A guide vane 7 is fixed to the bottom surface of the first distribution chamber 3. The guide vane 7 is composed of multiple arc-shaped metal guide vanes and is located in the first region 22, the second region 23, and the third region 24 of the dispensing grid plate 2 along the flow direction of the spinning solution. The guide vane 7 located in the first region 22 has a spacing of 18.0 mm and a radius of curvature of 8.0 mm. The guide vane 7 located in the second region 23 has a spacing of 24.0 mm and a radius of curvature of 12.0 mm. The guide vane 7 located in the third region 24 has a spacing of 32.0 mm and a radius of curvature of 16.0 mm. The guide vane has a height of 5.0 mm and a thickness of 3.0 mm.

[0090] The inner wall of the second distribution chamber 4 is fixed with guide ribs 8 along the flow direction of the spinning solution. The guide ribs 8 are wavy ribs arranged longitudinally with their axes parallel to the flow direction of the spinning solution, covering the entire axial length of the second distribution chamber 4. The top contour of the guide ribs 8 is a continuous wavy line, with the vertical amplitude of the crests and troughs gradually increasing from bottom to top. The surface of the ribs is machined with longitudinal grooves with a groove depth of 0.8 mm.

[0091] The housing 1 is formed by bolts connecting the first housing 11 and the second housing 12. The mating surface of the first housing 11 is provided with an annular groove 111, and the mating surface of the second housing 12 is provided with an annular boss 121. The annular groove 111 is embedded with a first sealing ring 13.

[0092] The liquid distribution grid plate 2 is fixed to the top of the first distribution chamber 3 by bolts, and a second sealing ring 25 is provided between the liquid distribution grid plate 2 and the top of the first distribution chamber 3.

[0093] The first housing 11 is provided with a discharge plug 112 that extends through the first distribution cavity 3.

[0094] In use, the flange interface 52 of the inlet section 5 is connected to an external high-pressure supply pump, and the outlet connector 62 of the outlet section 6 is connected to the multi-needle electrospinning head via a pressure-resistant hose. The supply pump is turned on, with the initial pressure set to 0.8 MPa, and a medium-viscosity spinning solution containing 10% PVA is introduced. The spinning solution is injected into the bottom of the first distribution chamber 3 through the outlet section 513 of the reducer 51, enters the second distribution chamber 4 through the distribution grid plate 2, and is evenly distributed to each spinning needle through the outlet section 6. Specifically, the gradient distribution holes 21 of the distribution grid plate 2 distribute the flow rate and compensate for pressure attenuation; the guide vanes 7 in the first distribution chamber 3 divide the laminar flow and suppress near-end turbulence; after the spinning solution enters the second distribution chamber 4 through the distribution grid plate 2, the guide ribs 8 guide the fluid to spiral upwards, enhancing gas-liquid separation.

[0095] After spinning is complete, turn off the liquid supply pump, open the discharge plug 112 of the first housing 11 to drain the residual liquid, and back-flush the dispensing hole 21 with acetone or DMAC to ensure there is no blockage.

[0096] Based on the preferred embodiments of the present invention described above, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A uniform liquid supply device suitable for multi-needle electrostatic airflow coupling spinning, characterized in that, include: The shell (1) has an axially penetrating main cavity inside; The liquid distribution grid plate (2) is horizontally fixed in the middle of the main cavity, dividing the main cavity into a lower first distribution cavity (3) and an upper second distribution cavity (4); the surface of the liquid distribution grid plate (2) is provided with an array of liquid distribution holes (21), the diameter of the liquid distribution holes (21) is 0.4-1.6mm, the horizontal lateral spacing between adjacent liquid distribution holes is 8-32mm, and the horizontal longitudinal spacing is 3-6mm; Along the fluid flow direction, the liquid distribution grid plate (2) is divided into a first region (22), a second region (23), and a third region (24); the gradient change of the liquid distribution holes (21) is as follows: in the first region (22), the hole diameter is 0.4-0.6 mm and the horizontal spacing is 8-12 mm; in the second region (23), the hole diameter is 0.8-1.2 mm and the horizontal spacing is 16-24 mm; and in the third region (24), the hole diameter is 1.2-1.6 mm and the horizontal spacing is 24-32 mm. The inner wall of the second distribution cavity (4) is fixed with a guide rib (8) along the flow direction of the spinning liquid; the guide rib (8) is arranged longitudinally, with its axis parallel to the flow direction of the spinning liquid, covering the axial length of the second distribution cavity (4); the top profile of the guide rib (8) is a continuous wave shape, and the vertical amplitude of the wave crest and trough gradually increases from bottom to top; The liquid inlet section (5) includes a reducing pipe (51) and a flange interface (52). The reducing pipe (51) includes an inlet section (511), a throat section (512), and an outlet section (513) connected in sequence. The inlet section (511) is connected to an external liquid supply pipeline through the flange interface (52). The outlet section (513) extends to the bottom of the first distribution chamber (3). The inner diameter of the throat section (512) is smaller than that of the inlet section (511) and the outlet section (513), and a wear-resistant ring (53) is embedded in its inner wall. The liquid outlet (6) includes a liquid outlet interface (61) distributed along the axial direction of the housing (1) and a liquid outlet connector (62) threaded to the liquid outlet interface (61).

2. The uniform liquid supply device according to claim 1, characterized in that, The volume ratio of the first distribution cavity (3) to the volume ratio of the second distribution cavity (4) is 2.5:1 to 4:

1.

3. The uniform liquid supply device according to claim 1, characterized in that, The shrinkage ratio of the inlet section (511) to the throat section (512) of the reducer (51) is 1:1.8 to 1:2.2, the expansion ratio of the throat section (512) to the outlet section (513) is 1:1.6 to 1:1.8, the length of the throat section (512) is 35-45mm, and the thickness of the wear ring (53) is 0.5-1.0mm.

4. The uniform liquid supply device according to claim 1, characterized in that, The bottom surface of the first distribution cavity (3) is fixed with a guide plate (7), which is an arc-shaped metal plate array with a height of 3-5mm and a thickness of 1-2mm; The guide vanes (7) are located in the first region (22), the second region (23), and the third region (24) of the liquid distribution grid plate (2) along the flow direction of the spinning solution. The guide vanes (7) located in the first region (22) have a spacing of 12-18 mm and a radius of curvature of 6-8 mm. The guide vanes (7) located in the second region (23) have a spacing of 20-24 mm and a radius of curvature of 10-12 mm. The guide vanes (7) located in the third region (24) have a spacing of 28-32 mm and a radius of curvature of 14-16 mm.

5. The uniform liquid supply device according to claim 1, characterized in that, The housing (1) includes a first housing (11) and a second housing (12), the first housing (11) and the second housing (12) are fitted together by a sealing assembly to form the main cavity inside; The sealing assembly includes an annular groove (111) disposed on the inner surface of the first housing (11), an annular boss (121) disposed on the inner surface of the second housing (12), and a first sealing ring (13) embedded in the annular groove (111); the annular groove (111) cooperates with the annular boss (121).

6. The uniform liquid supply device according to claim 1, characterized in that, The liquid distribution grid plate (2) is fixed to the top of the first distribution chamber (3) by bolts; a second sealing ring (25) is provided between the liquid distribution grid plate (2) and the top of the first distribution chamber (3).

7. The uniform liquid supply device according to claim 5, characterized in that, The first housing (11) is provided with a drain plug (112) that extends into the first distribution chamber (3).

8. A uniform liquid supply method suitable for multi-needle electrostatic airflow coupled spinning, based on the uniform liquid supply device according to any one of claims 1-7, characterized in that, include: S1. Connect the flange interface (52) to the external high-pressure liquid supply pump, and connect the liquid outlet connector (62) to the multi-needle electrostatic spinning head through the pressure-resistant hose; S2. Turn on the high-pressure liquid supply pump and introduce the spinning solution to the bottom of the first distribution chamber (3); the spinning solution enters the second distribution chamber (4) through the liquid distribution grid plate (2) and is evenly distributed to the multi-needle electrostatic spinning head through the liquid outlet connector (62); S3. After spinning is complete, turn off the high-pressure liquid supply pump, open the liquid drain plug (112) to drain the residual liquid, and flush the liquid separator (21) with acetone in the reverse direction.

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