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

Abstract

The invention relates to a uniform liquid supply device and method suitable for multi-needle electrostatic airflow coupling spinning, and belongs to the technical field of spinning equipment. The device comprises a shell which is internally provided with a liquid separation grid plate which divides the shell into a first distribution cavity and a second distribution cavity; liquid separation holes are arrayed on the surface of the liquid separation grid plate, and the hole diameter and the transverse distance change in a gradient mode according to the flowing direction; the liquid inlet part adopts a reducer pipe and comprises an inlet section, a throat section and an outlet section to form a contraction-expansion flow channel; an arc-shaped flow deflector array is arranged on the bottom surface of the first distribution cavity; wave-shaped flow guide ribs are arranged on the inner wall of the second distribution cavity; the shell is of a split type sealing structure, a sealing ring is embedded into the shell through cooperation of an annular groove and a boss, and double seals are arranged on the top of a liquid separation grid plate and the top of a cavity. The liquid outlet part is provided with liquid outlet connectors in the axial direction and is integrated with a liquid discharging plug. The production efficiency and the product quality of electrostatic airflow coupling spinning are integrally and remarkably improved, and the method is suitable for large-scale nanofiber preparation.

Description

Technical Field

[0001] The present invention belongs to the technical field of spinning equipment, and in particular relates to a uniform liquid supply device and method suitable for multi-needle electrostatic airflow coupled spinning. Background Art

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

[0003] Air-jet spinning utilizes high-speed airflow to stretch thin streams of spinning solution to ultrafine lengths, evaporating the solvent and producing micro-nanofibers. This technology boasts higher spinning efficiency than electrospinning. The turbulent shearing of the high-speed airflow within the spinning manifold creates a three-dimensional, curled shape and entangled fibers. This method is simple, easily controlled, and amenable to scalable production. It can process a wide range of polymer solutions, overcoming the thermoplastic and high melt flow requirements of existing melt-blown technologies, making it universally applicable.

[0004] In recent years, electrostatic airflow coupled spinning has been using a single nozzle spinning equipment and liquid supply device, and the spinning forming environment is open, resulting in low production rates and unable to meet the requirements of large-scale production. Therefore, it is urgent to design a uniform liquid supply device for multi-needle electrostatic airflow coupled spinning. Summary of the Invention

[0005] The present invention overcomes the deficiencies of the prior art and provides a uniform liquid supply device and method suitable for multi-needle electrostatic airflow coupled spinning.

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

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

[0008] The liquid separation grid is fixedly mounted horizontally in the middle of the main cavity, dividing the main cavity into a first distribution cavity at the bottom and a second distribution cavity at the top. The surface of the liquid separation grid is provided with a liquid separation hole array, the hole diameter of the liquid separation hole is 0.4-1.6mm, the horizontal lateral spacing between adjacent liquid separation holes is 8-32mm, and the horizontal longitudinal spacing is 3-6mm.

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

[0010] The liquid outlet portion includes a liquid outlet interface distributed along the axial direction of the shell and a liquid outlet connector threadedly connected to the liquid outlet interface.

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

[0012] The gradient changes of the separation holes are: 0.4-0.6mm pore diameter and 8-12mm horizontal lateral spacing in the first area; 0.8-1.2mm pore diameter and 16-24mm horizontal lateral spacing in the second area; 1.2-1.6mm pore diameter and 24-32mm horizontal lateral spacing in the third area.

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

[0014] In a preferred embodiment of the present invention, the contraction 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 length of the throat section is 35-45 mm, and the thickness of the wear-resistant ring is 0.5-1.0 mm.

[0015] In a preferred embodiment of the present invention, a guide plate is fixed to the bottom surface of the first distribution chamber, and 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 plates are located in the first, second and third areas of the liquid separation grid along the flow direction of the spinning solution; the guide plates located at the corresponding positions in the first area have a plate spacing of 12-18 mm and a curvature radius of 6-8 mm; the guide plates located in the second area have a plate spacing of 20-24 mm and a curvature radius of 10-12 mm; the guide plates located in the third area have a plate spacing of 28-32 mm and a curvature radius of 14-16 mm.

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

[0018] In a preferred embodiment of the present invention, the shell includes a first shell and a second shell, and the first shell and the second shell are matched through a sealing assembly to form a main cavity inside; the sealing assembly includes an annular groove arranged on the inner surface of the first shell, an annular boss arranged on the inner surface of the second shell, and a first sealing ring embedded in the annular groove; the annular groove cooperates with the annular boss.

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

[0020] In a preferred embodiment of the present invention, a liquid discharge plug penetrating to the first distribution chamber is provided on the first shell.

[0021] Another technical solution provided by the present invention is 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 electrospinning head through a pressure-resistant hose;

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

[0024] S3. After spinning is completed, turn off the high-pressure liquid supply pump, open the liquid drain plug to drain the residual liquid, and use acetone to reversely flush the separation hole.

[0025] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0026] (1) The present invention provides a uniform liquid supply device suitable for multi-needle electrostatic airflow coupled spinning, comprising a shell, a liquid separation grid arranged inside the shell, a first distribution chamber located below the liquid separation grid and a second distribution chamber located above the liquid separation grid, a liquid inlet portion arranged on the side end face of the shell, and a liquid outlet portion arranged on the bottom of the shell. Through the gradient change of the aperture and spacing of the liquid separation holes, the contraction and expansion flow channels of the reducer, and the guide vanes and guide plates, the spinning liquid enters from the reducer, flows upward from the bottom of the first distribution chamber, flows through the liquid separation grid into the second distribution chamber, and flows out from the liquid outlet interface, realizing a bottom-up pressure-driven liquid supply method, and solving the problems of large flow fluctuations under high pressure in traditional devices and inconsistent fiber diameters caused by vortexes.

[0027] (2) The aperture and lateral spacing of the separation holes on the surface of the separation grid gradually change in the direction of flow; the inlet section of the reducer flow channel shrinks, the throat section is inlaid with a tungsten carbide wear-resistant ring, and the outlet section expands, forming a gradient flow rate and pressure. The shrinkage of the inlet section of the reducer accelerates the flow of the spinning solution, the throat section forms a local high pressure, and the outlet section expands to slow down the flow rate. After the spinning solution enters the first distribution chamber at a stable pressure, the separation holes with small apertures and dense spacing on the separation grid suppress the flow accumulation caused by high-speed flow, avoiding the formation of a high-pressure area in the center due to excessive flow rate; the separation holes with large apertures and sparse spacing compensate for pressure attenuation, maintain the flow in the edge area, so that the pressure distribution of the spinning solution on the surface of the separation grid tends to be uniform, and the difference in the flow rate of multiple needles is significantly reduced. Compared with the traditional device, which has fixed apertures and sudden changes in flow channels, resulting in overload of flow in the center area and insufficient flow at the edge, and the accumulation of thickness in the center of the fiber membrane and excessive thinness at the edge, the uniformity of the lateral thickness of the fiber membrane of the present invention is improved, reducing the fluctuation of fiber diameter caused by uneven liquid supply.

[0028] (3) An array of arc-shaped guide vanes with a gradient curvature is provided at the bottom of the first distribution chamber, and a wavy guide rib with a gradient amplitude is provided on the inner wall of the second distribution chamber. The arc-shaped structure of the guide vanes generates local vortices through curvature changes, breaks up the initial high-speed flow of the liquid, and suppresses longitudinal stratification; the guide ribs gradually increase in amplitude from bottom to top, guiding the liquid to flow in a spiral, destroying the boundary layer separation near the liquid outlet, while the surface grooves reduce friction resistance, so that the spinning solution forms a stable laminar flow in the first distribution chamber and the second distribution chamber, the pressure fluctuation at the inlet of the liquid separation hole is reduced, and the uniformity of the flow field is improved. Compared with the traditional smooth cavity, which has uneven flow distribution due to vortex and stratification, and the fiber membrane has strip-like thickness differences, the present invention further reduces the discreteness of the fiber diameter, enhances the stability of equipment operation, and reduces downtime maintenance caused by flow field turbulence.

[0029] (4) On the one hand, the gradient of the reducer and the liquid separation hole provides a basic pressure field for the guide vanes and guide ribs, ensuring that the liquid flow on the surface of the liquid separation grid is evenly distributed; on the other hand, the guide vanes and guide ribs actively regulate the flow field to eliminate local vortices or stratification caused by the gradient of the reducer and the liquid separation hole. The high-pressure liquid accelerated by the reducer 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 realizing a bottom-up pressure-driven liquid supply method. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments described in the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts.

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

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

[0033] Figure 3 It is a structural diagram of the liquid inlet part;

[0034] Figure 4 It is a structural diagram of the main body cavity;

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

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

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

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

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

[0040] Exemplary devices:

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

[0042] The housing 1 has an axially extending main cavity therein;

[0043] A liquid separation grid 2 is fixedly mounted horizontally in the middle of the main cavity, dividing the main cavity into a first distribution chamber 3 at the bottom and a second distribution chamber 4 at the top. An array of liquid separation holes 21 is formed on the surface of the liquid separation grid 2. The diameter of the liquid separation holes 21 is 0.4-1.6 mm, and the horizontal spacing between adjacent liquid separation holes is 8-32 mm, and the horizontal spacing between adjacent liquid separation holes is 3-6 mm.

[0044] The liquid inlet portion 5 includes a reducer 51 and a flange interface 52. The reducer 51 includes an inlet section 511, a throat section 512, and an outlet section 513 connected in sequence. The throat section 512 has an inner diameter smaller than that of the inlet section 511 and the outlet section 513. The inlet section 511 is connected to an external liquid supply line via 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 portion 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 delivery rates from each needle, causing fluctuations in the lateral thickness of the fiber membrane. Traditional multi-needle electrospinning uses a constant-speed liquid supply mode, which results in a reduction in the liquid delivery from the distal needle due to pressure decay, and a significant reduction in the thickness of the fiber membrane edge. In the exemplary device, the array of liquid separation holes 21 on the liquid separation grid 2 covers the spacing range of multiple liquid outlet connectors 62, suppressing local pressure drops by matching the aperture and spacing; the reducer 51 forms a gradient contraction and expansion structure, using the Venturi effect to compensate for pressure loss, reducing fluctuations in the liquid supply pressure at the distal needle, and thus reducing the relative error in the fiber membrane thickness.

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

[0048] The gradient changes of the liquid separation holes 21 are: pore diameter 0.4-0.6mm, horizontal lateral spacing 8-12mm in the first area 22; pore diameter 0.8-1.2mm, horizontal lateral spacing 16-24mm in the second area 23; pore diameter 1.2-1.6mm, horizontal lateral spacing 24-32mm in the third area 24.

[0049] The flow rate in the proximal area of ​​the liquid separation hole 21 is too high, resulting in abnormal accumulation of the thickness in the center of the fiber membrane. When the conventional liquid separation holes 21 are evenly distributed, the proximal holes have a high jet velocity due to the large kinetic energy of the fluid. The exemplary device sets the liquid separation holes 21 in a gradient partition. In the first area, the pore size is 0.4-0.6mm to suppress the flow rate, and the lateral spacing is 8-12mm to increase the resistance; in the second area, the pore size is 0.8-1.2mm to balance the flow, and the lateral spacing is 16-24mm to optimize laminar flow; in the third area, the pore size is 1.2-1.6mm to compensate for pressure attenuation, and the lateral spacing is 24-32mm to reduce turbulent superposition. The shrinkage effect reduces the flow rate, reduces the fiber accumulation in the central area, and thus reduces the fluctuation of the lateral thickness of 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 reduced volume of the pressure accumulator chamber 4 improves 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 throat section 512 is 35-45 mm long, and the thickness of the tungsten carbide wear ring 53 is 0.5-1.0 mm. The reducer 51 allows the fluid to fully develop laminar flow, reducing pressure fluctuations caused by sudden changes in flow velocity, thereby reducing fiber diameter dispersion. The tungsten carbide wear ring 53 reduces the friction coefficient and inhibits the formation of vortices.

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

[0053] The first section of the small-curvature guide vane uses high curvature to generate strong vortices, breaking up the proximal high-speed fluid and suppressing the stratification effect. The second section of the transition guide vane uses medium curvature to guide the fluid to diffuse toward the distal end, balancing the pressure distribution. The third section of the large-curvature guide vane uses low curvature to reduce flow resistance, matching the large aperture requirement of the liquid separation hole 21, and improving the uniformity of pressure distribution in the first distribution chamber 3. During installation, multiple curved 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 fixed to the bottom surface of the first distribution chamber 3 with countersunk bolts to ensure that the arc direction of the guide vane is consistent with the direction of fluid flow. 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 direction of the spinning solution flow. The guide ribs 8 are continuous wavy ribs with a height of 2-4 mm and a top width of 1-2 mm. They are arranged longitudinally with their axes parallel to the direction of the spinning solution flow and cover 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 wave crests and troughs gradually increasing from bottom to top. The surface is machined with longitudinal grooves with a depth of 0.6-0.8 mm. The guide ribs 8 guide the spiral flow of the fluid through their periodic undulating structure, disrupting the boundary layer. The ribs with smaller amplitude at the proximal end suppress initial vortices, while the ribs with larger amplitude at the distal end enhance longitudinal mixing.

[0055] like Figure 2As shown, the housing 1 comprises a first housing 11 and a second housing 12 connected by bolts. The first and second housings 11, 12 cooperate through a sealing assembly, forming a main cavity within the housing. The sealing assembly comprises an annular groove 111 provided on the inner surface of the first housing 11, an annular boss 121 provided on the inner surface of the second housing 12, and a first sealing ring 13, made of fluororubber, embedded in the annular groove 111. The annular groove 111 cooperates with the annular boss 121. The bolt preload forces the annular boss 121 to form a rigid contact seal with the annular groove 111. The first sealing ring 13 compresses and deforms to compensate for thermal expansion and vibration, thereby blocking any leakage paths.

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

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

[0058] Example 1

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

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

[0061] The liquid separation grid 2 is a rectangular metal plate with a thickness of 3 mm, which is fixed horizontally in the middle of the main cavity, dividing the main cavity into a first distribution cavity 3 in the lower part and a second distribution cavity 4 in the upper part; the surface of the liquid separation grid 2 is arrayed with liquid separation holes 21, in the first area 22 with a length range of 0-30% from the liquid inlet end, the aperture of the liquid separation hole 21 is 0.3 mm, and the horizontal transverse spacing is 6 mm; in the second area 23 with a length range of 30-70% from the liquid inlet end, the aperture of the liquid separation hole 21 is 0.7 mm, and the horizontal transverse spacing is 16 mm; in the third area 24 with a length range of 70-100% from the liquid inlet end, the aperture of the liquid separation hole 21 is 1.5 mm, and the horizontal transverse spacing is 28 mm; the horizontal and longitudinal spacing of the liquid separation holes 21 is 3.0 mm.

[0062] The liquid inlet part 5 includes a reducer 51 and a flange interface 52. The reducer 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 the inner wall is inlaid with a tungsten carbide wear-resistant ring 53 with a thickness of 0.5 mm.

[0063] The liquid outlet portion 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 chamber 3 is 2.5 times that of the second distribution chamber 4 , the height of the first distribution chamber 3 is 1.8 times that of the second distribution chamber 4 , and the width of the first distribution chamber 3 is 1.3 times that of the second distribution chamber 4 .

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

[0066] Guide ribs 8 are fixed to the inner wall of the second distribution chamber 4 along the direction of the spinning solution flow. These ribs are wavy and arranged longitudinally, with their axes parallel to the direction of the spinning solution flow, 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 wave crests and troughs gradually increasing from bottom to top. The rib surface is machined with longitudinal grooves with a depth of 0.6 mm.

[0067] The housing 1 is connected by a first housing 11 and a second housing 12 via bolts. An annular groove 111 is provided on the mating surface of the first housing 11 , and an annular boss 121 is provided on the mating surface of the second housing 12 . A first sealing ring 13 is embedded in the annular groove 111 .

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

[0070] Example 2

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

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

[0073] The liquid separation grid 2 is a rectangular metal plate with a thickness of 3 mm, which is fixed horizontally in the middle of the main cavity, dividing the main cavity into a first distribution cavity 3 in the lower part and a second distribution cavity 4 in the upper part; the surface of the liquid separation grid 2 is arrayed with liquid separation holes 21, and in the first area 22 with a length range of 0-30% from the liquid inlet end, the aperture of the liquid separation hole 21 is 0.5 mm, and the horizontal transverse spacing is 10 mm; in the second area 23 with a length range of 30-70% from the liquid inlet end, the aperture of the liquid separation hole 21 is 1.0 mm, and the horizontal transverse spacing is 20 mm; in the third area 24 with a length range of 70-100% from the liquid inlet end, the aperture of the liquid separation hole 21 is 1.4 mm, and the horizontal transverse spacing is 28 mm; the horizontal and longitudinal spacing of the liquid separation holes 21 is 5.0 mm.

[0074] The liquid inlet part 5 includes a reducer 51 and a flange interface 52. The reducer 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 is 40.0 mm long, and the inner wall is inlaid with a tungsten carbide wear-resistant ring 53 with a thickness of 1.0 mm.

[0075] The liquid outlet portion 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 chamber 3 is 3.5 times that of the second distribution chamber 4 , the height of the first distribution chamber 3 is 2.0 times that of the second distribution chamber 4 , and the width of the first distribution chamber 3 is 1.5 times that of the second distribution chamber 4 .

[0077] A guide plate 7 is fixed to the bottom surface of the first distribution chamber 3. The guide plate 7 is composed of multiple arc-shaped metal guide plates, which are respectively located in the first area 22, the second area 23 and the third area 24 of the liquid separation grid 2 along the flow direction of the spinning solution; the guide plates 7 located in the first area 22 have a plate spacing of 15.0 mm and a curvature radius of 7.0 mm; the guide plates 7 located in the second area 23 have a plate spacing of 22.0 mm and a curvature radius of 11.0 mm; the guide plates located in the third area 24 have a plate spacing of 30.0 mm and a curvature radius of 15.0 mm; the guide plates are 4.0 mm high and 2.0 mm thick.

[0078] Guide ribs 8 are fixed to the inner wall of the second distribution chamber 4 along the direction of the spinning solution flow. These ribs are wavy and arranged longitudinally, with their axes parallel to the direction of the spinning solution flow, 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 wave crests and troughs gradually increasing 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 connected by a first housing 11 and a second housing 12 via bolts. An annular groove 111 is provided on the mating surface of the first housing 11 , and an annular boss 121 is provided on the mating surface of the second housing 12 . A first sealing ring 13 is embedded in the annular groove 111 .

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

[0082] Example 3

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

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

[0085] The liquid separation grid 2 is a rectangular metal plate with a thickness of 3 mm, which is horizontally fixed in the middle of the main cavity, dividing the main cavity into a first distribution cavity 3 at the bottom and a second distribution cavity 4 at the top; the surface of the liquid separation grid 2 is arrayed with liquid separation holes 21, and in the first area 22 with a length range of 0-30% from the liquid inlet end, the aperture of the liquid separation hole 21 is 0.6 mm, and the horizontal transverse spacing is 12 mm; in the second area 23 with a length range of 30-70% from the liquid inlet end, the aperture of the liquid separation hole 21 is 1.2 mm, and the horizontal transverse spacing is 24 mm; in the third area 24 with a length range of 70-100% from the liquid inlet end, the aperture of the liquid separation hole 21 is 1.6 mm, and the horizontal transverse spacing is 32 mm; the horizontal and longitudinal spacing of the liquid separation holes 21 is 6.0 mm.

[0086] The liquid inlet part 5 includes a reducer 51 and a flange interface 52. The reducer 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 is 45.0 mm long, and the inner wall is inlaid with a tungsten carbide wear-resistant ring 53 with a thickness of 1.0 mm.

[0087] The liquid outlet portion 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 chamber 3 is 4.0 times that of the second distribution chamber 4 , the height of the first distribution chamber 3 is 2.2 times that of the second distribution chamber 4 , and the width of the first distribution chamber 3 is 1.6 times that of the second distribution chamber 4 .

[0089] A guide plate 7 is fixed to the bottom surface of the first distribution chamber 3. The guide plate 7 is composed of multiple arc-shaped metal guide plates, which are respectively located in the first area 22, the second area 23 and the third area 24 of the liquid separation grid 2 along the flow direction of the spinning solution; the guide plates 7 located in the first area 22 have a plate spacing of 18.0 mm and a curvature radius of 8.0 mm; the guide plates 7 located in the second area 23 have a plate spacing of 24.0 mm and a curvature radius of 12.0 mm; the guide plates 7 located in the third area 24 have a plate spacing of 32.0 mm and a curvature radius of 16.0 mm; the guide plates are 5.0 mm high and 3.0 mm thick.

[0090] Guide ribs 8 are fixed to the inner wall of the second distribution chamber 4 along the direction of the spinning solution flow. These ribs are wavy and arranged longitudinally, with their axes parallel to the direction of the spinning solution flow, 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 wave crests and troughs gradually increasing from bottom to top. The rib surface is machined with longitudinal grooves with a depth of 0.8 mm.

[0091] The housing 1 is connected by a first housing 11 and a second housing 12 via bolts. An annular groove 111 is provided on the mating surface of the first housing 11 , and an annular boss 121 is provided on the mating surface of the second housing 12 . A first sealing ring 13 is embedded in the annular groove 111 .

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

[0094] When the device is in use, the flange interface 52 of the liquid inlet 5 is connected to the external high-pressure liquid supply pump, and the liquid outlet connector 62 of the liquid outlet 6 is connected to the multi-needle electrospinning head through a pressure-resistant hose. Turn on the liquid supply pump, set the initial pressure to 0.8MPa, and introduce a medium-viscosity spinning solution of 10% PVA. 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 liquid separation grid 2, and is evenly distributed to each spinning needle through the liquid outlet 6. Among them, the gradient separation hole 21 of the liquid separation grid 2 distributes the flow and compensates for the pressure attenuation; the guide plate 7 in the first distribution chamber 3 divides the laminar flow and suppresses the proximal turbulence; after the spinning solution enters the second distribution chamber 4 through the liquid separation grid 2, the guide rib 8 guides the fluid to spiral upward to enhance the gas-liquid separation.

[0095] After spinning is completed, the liquid supply pump is turned off, the discharge plug 112 of the first housing 11 is opened to drain the residual liquid, and the liquid separation hole 21 is reversely flushed with acetone or DMAC to ensure that there is no blockage.

[0096] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the content of the specification and must be determined according to the scope of the claims.

Claims

1. A uniform liquid supply device suitable for multi-needle electrostatic airflow coupled spinning, characterized in that: include: The housing (1) has an axially penetrating main cavity therein; A liquid separation grid (2) is fixedly arranged horizontally in the middle of the main cavity, dividing the main cavity into a first distribution cavity (3) at the bottom and a second distribution cavity (4) at the top; a liquid separation hole (21) is arrayed on the surface of the liquid separation grid (2); the diameter of the liquid separation hole (21) is 0.4-1.6 mm, the horizontal lateral spacing between adjacent liquid separation holes is 8-32 mm, and the horizontal longitudinal spacing is 3-6 mm; The liquid inlet portion (5) comprises a reducing pipe (51) and a flange interface (52), wherein the reducing pipe (51) comprises 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 via 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 the inner wall; The liquid outlet portion (6) comprises 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).

2. The uniform liquid supply device according to claim 1, characterized in that: Along the fluid flow direction, the liquid separation grid (2) is divided into a first area (22), a second area (23) and a third area (24); The gradient variation of the liquid separation holes (21) is as follows: the hole diameter is 0.4-0.6 mm and the horizontal and lateral spacing is 8-12 mm in the first region (22); the hole diameter is 0.8-1.2 mm and the horizontal and lateral spacing is 16-24 mm in the second region (23); and the hole diameter is 1.2-1.6 mm and the horizontal and lateral spacing is 24-32 mm in the third region (24).

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

1.

4. The uniform liquid supply device according to claim 1, characterized in that: The contraction ratio of the reducer (51) from the inlet section (511) to the throat section (512) is 1:1.8 to 1:2.2, 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 wear-resistant ring (53) is 0.5-1.0 mm.

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

6. The uniform liquid supply device according to claim 2, characterized in that: The inner wall of the second distribution chamber (4) is fixed with a guide rib (8) along the flow direction of the spinning solution; the guide rib (8) is arranged longitudinally, with its axis parallel to the flow direction of the spinning solution, and covers the axial length of the second distribution chamber (4); the top profile of the guide rib (8) is a continuous wave line, and the vertical amplitude of the wave crest and the wave trough gradually increases from bottom to top.

7. The uniform liquid supply device according to claim 1, characterized in that: The housing (1) comprises a first housing (11) and a second housing (12); the first housing (11) and the second housing (12) are matched with each other through a sealing assembly to form the main cavity therein; The sealing assembly comprises an annular groove (111) provided on the inner surface of the first shell (11), an annular boss (121) provided on the inner surface of the second shell (12), and a first sealing ring (13) embedded in the annular groove (111); the annular groove (111) cooperates with the annular boss (121).

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

9. The uniform liquid supply device according to claim 7, characterized in that: The first shell (11) is provided with a liquid discharge plug (112) that passes through the first distribution chamber (3).

10. 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 to 9, 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 electrospinning head through a pressure-resistant hose; S2, turning on the high-pressure liquid supply pump, and introducing the spinning solution to the bottom of the first distribution chamber (3); the spinning solution enters the second distribution chamber (4) through the liquid separation grid (2), and is evenly distributed to the multi-needle electrospinning head through the liquid outlet connector (62); S3. After spinning is completed, the high-pressure liquid supply pump is turned off, the liquid discharge plug (112) is opened to drain the residual liquid, and the liquid separation hole (21) is reversely flushed with acetone.

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