Radial pulp distribution device for nanofiber wet forming

Abstract

The invention relates to a nanofiber wet forming radial pulp distribution device which comprises a barrel, a plurality of branch pipes and a flow dividing piece, the flow dividing piece comprises a cylindrical flow dividing part and a conical flow dividing part, the cylindrical flow dividing part and the barrel are coaxially arranged, the conical flow dividing part is connected to the bottom end of the cylindrical flow dividing part, and an interlayer space is formed between the outer wall faces of the conical flow dividing part and the cylindrical flow dividing part and the inner wall face of the barrel. According to the designed radial slurry distribution device for nanofiber wet forming, through the design that the cylinder structure is combined with the cylindrical flow dividing part, the conical flow dividing part and the branch pipes with the equal diameter and the equal length, the fluid dynamic characteristic of slurry is remarkably optimized, and even under the conditions that the diameter of the cylinder is small, the number of the branch pipes is small and the distance between every two adjacent branch pipes is large, the slurry can be distributed evenly. And the slurry can stably and uniformly flow in the interlayer space, so that the problems of flocculation, deposition, non-uniform slurry distribution and the like of the slurry caused by too low flow speed and non-uniform distribution of the slurry in the traditional radial slurry distributor are solved, and the slurry distribution uniformity of the low-weight nanofiber slurry and the stability of the product quality are improved.

Description

Technical Field

[0001] The invention relates to the technical field of fiber material processing equipment, in particular to a radial pulping device for wet forming of nanofibers. Background Art

[0002] In fiber material processing technology, especially with the growing demand for lightweight and high-performance materials, low-weight fiber materials (such as special paper, filter materials, sanitary products, etc.) are increasingly used. However, the uniformity of pulp distribution during its processing has always been a technical challenge. As one of the key equipment, the pulp distributor of the fiber material headbox has a direct impact on the quality and production efficiency of the final product.

[0003] The main types of pulp distributors on the market include conical tube pulp distributors and radial pulp distributors (also called cylindrical pulp distributors). The conical tube pulp distributor controls the lateral distribution of the pulp by gradually changing the cross-section along the width direction, but its structure is complex, the manufacturing cost is high, and the professional skills required of the production personnel are high, which limits its wide application. The radial pulp distributor has gradually become the mainstream choice with its advantages such as simple structure and easy maintenance. A typical radial pulp distributor consists of a pulp inlet reducer, a stepped diffuser, a cylinder with multiple branch pipes, and a top cover. The pulp first enters the pulp inlet reducer for preliminary pressure adjustment, then flows through the stepped diffuser for rectification, and finally enters the cylinder and flows out through multiple branch pipes evenly distributed on its circumference. Because the radial pulp distributor has a symmetrical geometric structure, it can theoretically effectively ensure the consistency of the pulp flow rate, pressure and state, thereby improving production stability and product quality.

[0004] However, for the forming of low-quantity fiber material webs, especially at higher web concentrations, the web flow rate is small. When a radial pulp distributor is used for pulp distribution, in order to ensure that the pulp in the cylinder has a certain flow rate, the cylinder diameter and the number of radially arranged branches are small. When connected to the branch pipes of the headbox through a hose, the spacing between adjacent branch pipes is large, and it is not easy to achieve uniform lateral pulp distribution in the headbox.

[0005] Although the existing radial pulp distributors have met the basic needs of the market to a certain extent, their defects have become increasingly prominent when facing the pulp distribution challenges of low-weight fiber materials. Uneven pulp distribution will lead to fluctuations in product quality, affecting product performance and market competitiveness; inconvenient equipment maintenance will increase downtime and labor costs, and reduce production efficiency; poor adaptability will limit its application scope and technical development potential. Therefore, the development of a pulp distribution device that can efficiently and evenly handle low-weight fiber materials has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a radial slurry spreading device for wet forming of nanofibers, which significantly improves the slurry spreading uniformity and product quality of low-quantity fiber materials under high slurry concentration and small slurry flow conditions, while having the advantages of easy maintenance, strong adaptability and high economic benefits.

[0007] In order to achieve the above-mentioned purpose, the radial pulping device for wet forming of nanofibers designed by the present invention comprises: A cylinder body, the bottom of which is provided with a pulp inlet; A plurality of branch pipes are provided on the outer wall surface of the cylinder and are arranged at equal intervals along the circumference of the cylinder, and the inner diameters of the plurality of branch pipes are all equal; A flow divider is provided on the cylinder, comprising a cylindrical flow divider coaxially arranged with the cylinder and a conical flow divider connected to the bottom end of the cylindrical flow divider, wherein an interlayer space is formed between the outer wall surfaces of the conical flow divider and the cylindrical flow divider and the inner wall surface of the cylinder; Wherein, each of the branch pipes is communicated with the interlayer space; the slurry enters the interlayer space from the slurry inlet and is discharged through the multiple branch pipes.

[0008] In order to improve the utilization rate of the slurry and the uniformity of the slurry distribution, a slurry return port is provided on the top of the cylinder, and the slurry inlet is connected to the slurry return port through the interlayer space.

[0009] In order to evenly distribute the pulp flow, it also includes an annular pulp distributing plate arranged in the interlayer space, the inner wall surface of the annular pulp distributing plate is connected to the outer wall surface of the cylindrical diversion part, the outer wall surface of the annular pulp distributing plate is connected to the inner wall surface of the cylinder, and a plurality of stepped holes or gradually expanding holes are equidistantly spaced on the plate surface of the annular pulp distributing plate along the circumference of the cylinder, and the apertures of the stepped holes and gradually expanding holes tend to increase along the slurry flow direction in the interlayer space.

[0010] In order to avoid the generation of eddies or flow stagnation areas, the lower plate surface of the annular pulp distribution plate is coplanar with the bottom extension surface of the conical diverter.

[0011] In order to optimize the flow state of the slurry at the top of the cylinder, a diffusion cone is provided on the top of the cylinder, and the diameter of the diffusion cone gradually increases along the slurry flow direction; a conical diversion portion is provided on the top of the cylindrical diversion portion, and the large bottom surface of the conical diversion portion is connected to the cylindrical diversion portion, and the outer wall surface of the cylindrical diversion portion is parallel to the inner wall surface of the diffusion cone portion; the slurry return port is arranged in the diffusion cone portion.

[0012] In order to reduce the possibility of slurry flocculation, the connection between the conical diverter and the cylindrical diverter is smoothly transitioned.

[0013] In order to reduce the friction between the fiber and the tube wall and avoid the fiber hanging on the wall and clogging, the inner wall surface of the branch tube is treated to be ultra-smooth.

[0014] In order to guide the slurry to smoothly enter the interlayer space, a contraction cone is provided at the bottom of the cylinder, and the slurry inlet is arranged at the contraction cone; the outer wall surface of the conical diversion portion, the inner wall surface of the contraction cone, the outer wall surface of the cylindrical diversion portion and the inner wall surface of the cylinder together form the interlayer space.

[0015] A further solution is that the outer wall surface of the conical diversion portion is parallel to the inner wall surface of the contraction cone portion.

[0016] In order to facilitate the maintenance, cleaning and overhaul of the equipment, a top cover is also included, which is detachably mounted on the slurry return port and is provided with a pipe joint for slurry discharge. The cylindrical diverter part of the diverter is connected to the top cover through a support.

[0017] The radial pulping device for wet forming of nanofibers designed by the present invention effectively solves the technical problem that it is difficult for traditional radial pulping devices to achieve uniform lateral pulping of low-quantity fiber materials, especially under high online concentration and small online flow conditions. The device significantly optimizes the fluid dynamics characteristics of the slurry through the cylindrical structure combined with its internal cylindrical diversion part, conical diversion part and equal diameter and equal length branch pipe design. Even when the cylinder diameter is small, the number of branches is small, and the distance between adjacent branches is large, it can ensure that the slurry forms a stable and uniform flow in the interlayer space, so as to obtain consistent pressure and flow rate at the outlet of each branch pipe, eliminate the problems of slurry flocculation, deposition and uneven pulping caused by the slow slurry flow rate and uneven distribution of the traditional radial pulping device, and significantly improve the uniformity of the pulping of low-quantity nanofiber slurry and the stability of product quality. More importantly, the device has good adaptability to different types of low-quantity nanofiber materials. By adjusting the diversion structure or replacing components of different specifications, different production needs can be met, reducing production costs and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a radial pulping device for wet forming of nanofibers provided in one embodiment of the present application.

[0019] Figure 2 yes Figure 1 Sectional view at AA.

[0020] Figure 3 It is a schematic structural diagram of a radial pulping device for wet forming of nanofibers provided in another embodiment of the present application.

[0021] Figure 4 It is a schematic structural diagram of a radial pulping device for wet forming of nanofibers provided in another embodiment of the present application.

[0022] Figure 5It is a schematic structural diagram of a radial pulping device for wet forming of nanofibers provided in yet another embodiment of the present application.

[0023] Among them: cylinder 10, slurry inlet 11, slurry return port 12, diffusion cone 13, contraction cone 14, branch pipe 20, diverter 30, cylindrical diverter 31, conical diverter 32, truncated cone diverter 33, interlayer space 40, annular slurry distribution plate 50, stepped hole 51, top cover 60, pipe joint 61, support 62, slurry inlet pipe 100, variable diameter rectifier 101, slurry return pipe 102. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0025] The embodiment of the present application provides a radial pulping device for wet forming of nanofibers, which is mainly used in a width flow box of low-weight fiber materials, and aims to improve the uniformity and efficiency of the distribution of low-weight fiber slurry in the width direction.

[0026] like Figure 1 , Figure 2 As shown, the radial slurry distribution device mainly includes a cylinder 10, a plurality of branch pipes 20 and a flow divider 30.

[0027] The bottom of the cylinder 10 is provided with a slurry inlet 11; a plurality of branch pipes 20 are provided on the outer wall of the cylinder 10 and are arranged at equal intervals along the circumference of the cylinder 10, and the inner diameters of the plurality of branch pipes 20 are all equal.

[0028] The barrel 10 is the main structure of the device, and a slurry inlet 11 is provided at the bottom thereof for receiving the slurry transported by the external slurry inlet pipe 100. In specific implementation, the slurry inlet pipe 100 can be connected to the slurry inlet 11 at the bottom of the barrel 10 through a variable diameter rectifier 101. In this embodiment, a gradual flow channel is provided inside the variable diameter rectifier 101, and the gradual flow channel can be designed to be conical or other shapes as needed, so as to adjust the initial velocity and flow direction of the slurry, reduce the adverse effects of turbulence, and smoothly introduce the slurry into the barrel 10; and a plurality of branch pipes 20 are arranged at equal intervals along the circumference of the top of the barrel 10, and the inner diameter and length of all branch pipes 20 are equal. In this embodiment, a pipe joint, such as a quick joint or a flange joint, is provided at the outlet of each branch pipe 20 to facilitate connection with an external hose, thereby transporting the slurry to the receiving pipe in the headbox.

[0029] A diverter 30 is provided in the cylinder 10, and the diverter 30 includes a cylindrical diverter portion 31 coaxially arranged with the cylinder 10 and a conical diverter portion 32 connected to the bottom end of the cylindrical diverter portion 31, and an interlayer space 40 is formed between the outer wall surfaces of the conical diverter portion 32 and the cylindrical diverter portion 31 and the inner wall surface of the cylinder 10; wherein each branch pipe 20 is connected to the interlayer space 40; the slurry enters the interlayer space 40 from the slurry inlet 11 and is discharged through multiple branch pipes 20.

[0030] Specifically, the outer wall surfaces of the conical diverter 32 and the cylindrical diverter 31 and the inner wall surface of the cylinder 10 jointly form an annular interlayer space 40, and the inlet of each branch pipe 20 is connected to the interlayer space 40, so that the arrangement of the diverter 30 enables the slurry to flow from bottom to top in the interlayer space 40, and multiple branch pipes 20 are evenly distributed on the top edge of the cylinder 10, and the spacing between each other and the distance between each branch pipe inlet and the diverter 30 are equal. This arrangement ensures the uniform distribution of the slurry in the radial direction of the cylinder 10. In this embodiment, the diverter 30 can be made of corrosion-resistant and wear-resistant metal materials such as stainless steel and titanium alloy, and is integrally formed by precision casting or machining processes to ensure its dimensional accuracy and surface finish.

[0031] During operation, the slurry first enters the variable diameter rectifier 101 through the slurry inlet pipe 100. After pretreatment, the flow rate and flow direction of the slurry are adjusted, and then the slurry flows into the slurry inlet 11 at the bottom of the cylinder 10 and enters the interlayer space 40. In the interlayer space 40, the slurry moves upward along the annular channel between the inner wall of the cylinder 10 and the outer wall of the diverter 30. Thanks to the smooth design of the inner wall of the interlayer space 40 and the outer surface of the diverter 30, even at a lower slurry flow rate, it can maintain good fluidity and avoid the risk of blockage. When the slurry reaches the area where the conical diverter 32 is located, the conical surface of the conical diverter 32 cooperates with the cylindrical diverter 31 to evenly distribute the slurry to the inlets of each branch pipe 20, so that the slurry is diverted to different areas of the headbox through multiple branch pipes 20 under the combined action of its own gravity and pumping pressure, thereby achieving balanced laying of the slurry on the entire width.

[0032] In this embodiment, the connection between the conical diverter 32 and the cylindrical diverter 31 is smoothly transitioned. With this structural design, when the slurry flows through this area, the smooth transition curve between the conical diverter 32 and the cylindrical diverter 31 reduces the resistance of the slurry flowing through this area, so that the slurry can flow upward more smoothly, and the possibility of the fiber hanging on the wall and winding at the connection is minimized.

[0033] Through the above-mentioned structural design, the radial pulp distribution device can make the diameter of the cylinder 10 large enough according to actual needs, so that a sufficient number of branch pipes 20 can be arranged to ensure that it can effectively cover the entire width of the headbox, avoiding the problem of excessively high or low pulp concentration in local areas, and significantly improving the uniformity and efficiency of pulp distribution of low-quantity fiber pulp.

[0034] In some embodiments, Figure 3 As shown, a return slurry port 12 is provided at the top of the cylinder 10, and the slurry inlet 11 is connected to the return slurry port 12 through the interlayer space 40. In specific implementation, the return slurry port 12 can be connected to the external return slurry pipe 102 through a flange or other suitable connection structure, which can return the excess slurry that is not completely discharged by the branch pipe 20, and re-transport it back to the slurry inlet 11 through the return slurry pipeline (not shown in the figure), so as to form a recycling of slurry, reduce the waste of slurry, and improve the utilization rate of raw materials. At the same time, the circulation of slurry can further promote the mixing and dispersion of slurry fibers, especially for low-quantity fiber slurry, the circulation can keep the slurry in a suspended state for a longer time, avoid fiber sedimentation and agglomeration, and help improve the uniformity of slurry distribution and the quality of the final product. In addition, the slurry may entrain or generate gas during the flow process, and the return slurry port 12 can be used as an exhaust port to discharge the gas in the slurry, avoid the formation of bubbles in the slurry, and thus reduce the quality defects such as pores and pinholes that may appear in the final product.

[0035] In another embodiment, in order to control the return slurry flow rate, a flow regulating valve, such as a ball valve, a butterfly valve or a plunger valve, is usually provided in the return slurry pipeline. By adjusting the opening of the valve, the return slurry flow rate can be accurately controlled, thereby adjusting the slurry pressure and flow balance of the entire radial slurry distribution device. In some cases, in order to overcome the resistance loss of the return slurry pipeline or actively control the return slurry flow rate according to process requirements, a return slurry pump can also be installed in the return slurry pipeline. For example, a centrifugal pump or a screw pump.

[0036] In some embodiments, Figure 1 , Figure 2 , Figure 3 As shown, it also includes an annular pulp distributing plate 50 arranged in the interlayer space 40, the inner wall surface of the annular pulp distributing plate 50 is connected to the outer wall surface of the cylindrical diversion part 31, the outer wall surface of the annular pulp distributing plate 50 is connected to the inner wall surface of the cylinder 10, and a plurality of stepped holes 51 or gradually expanding holes are evenly spaced along the circumference of the cylinder 10 on the plate surface of the annular pulp distributing plate 50, and the apertures of the stepped holes 51 and the gradually expanding holes increase along the slurry flow direction in the interlayer space.

[0037] In specific implementation, the annular pulp distribution plate 50 can be made of corrosion-resistant materials such as stainless steel, and its inner diameter matches the outer diameter of the cylindrical diverter portion 31, and is connected to the outer wall surface of the cylindrical diverter portion 31 by welding or interference fit; and its outer diameter matches the inner diameter of the cylinder 10, and is connected to the inner wall surface of the cylinder 10 by welding or other fastening methods.

[0038] Specifically, on the plate surface of the annular pulp distribution plate 50, a plurality of stepped holes 51 or gradually expanding holes are provided at equal intervals along the circumference of the cylinder 10. Taking the stepped holes 51 as an example: the specific number, aperture size and distribution density of these stepped holes 51 can be adjusted according to actual needs. For example, for low-quantity fiber slurry, the number and distribution density of the stepped holes 51 can be appropriately increased, and the aperture can be reduced to enhance the turbulence effect and dispersion effect. At the same time, the aperture of the stepped holes 51 increases along the slurry flow direction, that is, the aperture of each stepped hole 51 is smaller on the side close to the slurry inlet 11, and the aperture is larger on the side close to the branch pipe 20. This design of gradually increasing aperture makes the slurry experience a process of acceleration and deceleration when passing through each stepped hole 51, further aggravating the turbulence intensity, helping to fully disperse the fibers, and better adapting to the changing trend of the slurry gradually decreasing in the upward flow process of the slurry in the interlayer space 40.

[0039] In actual work, the setting of the annular pulp distribution plate 50 divides the interlayer space 40 into two parts, the upper and lower parts. After the slurry enters the lower part of the interlayer space 40 from the pulp inlet 11, it first diffuses to the surroundings under the guidance of the conical diversion part 32. When the slurry encounters the obstruction of the annular pulp distribution plate 50, it must pass through the stepped holes 51 thereon to continue to flow upward. In this process, the slurry is forced to be mixed and dispersed again in the radial and circumferential directions, effectively eliminating the local flow velocity differences caused by factors such as the slurry inlet position and the cylinder structure, so that the slurry is distributed more evenly on the cross section of the entire cylinder 10. At the same time, when the slurry flows through the stepped holes 51, due to the sudden change of the flow area and the gradual increase of the aperture, a strong turbulent effect is generated, which not only helps to fully disperse the fibers and prevent fiber agglomeration, but also enables the slurry to more fully fill the entire interlayer space 40, reducing the generation of flow dead zones and avoiding fiber deposition caused by too low slurry flow velocity in local areas.

[0040] In an optional embodiment, under certain specific process conditions, for example, when the slurry itself has good uniformity and fluidity, or the requirements for slurry pretreatment are not high, the variable diameter rectifier 101 in the aforementioned embodiment can be eliminated, and the slurry inlet pipe 100 can be directly connected to the slurry inlet 11 at the bottom of the cylinder 10. This simplified design mainly relies on the annular slurry distribution plate 50 to achieve uniform distribution of the slurry in the radial direction of the cylinder 10. Specifically, the presence of the annular slurry distribution plate 50 divides the interlayer space 40 into two parts, upper and lower. After the slurry enters the lower part of the interlayer space 40 from the slurry inlet 11, it must pass through the multiple stepped holes 51 opened on the annular slurry distribution plate 50 to continue to flow upward. Since the stepped holes 51 are arranged at equal intervals along the circumference of the annular slurry distribution plate 50, and their apertures increase along the slurry flow direction, the slurry will form a relatively uniform distribution on the lower surface of the annular slurry distribution plate 50 when passing through the stepped holes 51. Even if the slurry enters the slurry inlet 11 directly from the slurry inlet pipe 100 without being pre-treated by the variable diameter rectifier 101, the uniform distribution effect of the annular slurry distribution plate 50 can still compensate for the possible initial uneven distribution to a large extent.

[0041] It should be noted that when choosing whether to cancel the variable diameter rectifier 101, it is necessary to comprehensively consider the characteristics of the slurry, the process conditions and the requirements for the uniformity of the slurry. Generally, for low-quantity fiber slurry, due to its low fiber content, the requirements for turbulent mixing and dispersion are higher, so it is more inclined to retain the variable diameter rectifier 101 to obtain a better pretreatment effect. For some high-concentration slurries or slurries with good uniformity and fluidity, it can be considered to cancel the variable diameter rectifier 101 to simplify the equipment structure and reduce manufacturing costs.

[0042] In some embodiments, Figure 1 , Figure 3 As shown, the lower plate surface of the annular pulp distribution plate 50 is coplanar with the bottom extension surface of the conical diverter 32. This structural design prevents the slurry from directly entering the interlayer space 40 corresponding to the outer wall of the cylindrical diverter 31 under the flow guidance of the conical diverter 32, so as to avoid sudden changes in the cross-sectional area of ​​the flow channel, thereby eliminating eddy currents and flow stagnation that may occur in this area.

[0043] In some embodiments, Figure 4 , Figure 5As shown, a diffusion cone 13 is provided at the top of the cylinder 10, and the diameter of the diffusion cone 13 gradually increases along the slurry flow direction; a truncated cone shunt 33 is provided at the top of the cylindrical shunt 31, and the large bottom surface of the truncated cone shunt 33 is connected to the cylindrical shunt 31, and the outer wall surface of the cylindrical shunt 31 is parallel to the inner wall surface of the diffusion cone 13; and the slurry return port 12 is provided at the diffusion cone 13. Specifically, the diffusion cone 13 is in the shape of an inverted cone, and its diameter gradually increases along the axial direction of the cylinder 10, that is, in the upward direction. In actual work, the slurry flows upward in the interlayer space 40, and when it reaches the top area of ​​the cylinder 10, due to the expansion effect of the diffusion cone 13, the flow velocity of the slurry gradually decreases, and the turbulence intensity is also weakened, that is, the slurry is prevented from directly impacting the top of the cylinder 10, or smoothly transitioning to the slurry return port 12 along the surface of the truncated cone shunt 33. In addition, since the outer wall of the cylindrical diverter 31 is parallel to the inner wall of the diffusion cone 13, a uniform transition of the flow cross-sectional area of ​​the interlayer space 40 between the two is ensured, avoiding the generation of vortices caused by sudden changes in the flow cross-sectional area, and maintaining the stability of the slurry flow.

[0044] In some embodiments, the inner wall surface of the branch pipe 20 is subjected to ultra-smooth treatment.

[0045] In some embodiments, Figure 1 As shown, in order to guide the slurry to smoothly enter the interlayer space 40, a contraction cone 14 is provided at the bottom of the cylinder 10, and the slurry inlet 11 is provided at the contraction cone 14; the outer wall surface of the conical diversion portion 32, the inner wall surface of the contraction cone 14, the outer wall surface of the cylindrical diversion portion 31 and the inner wall surface of the cylinder 10 jointly form the interlayer space 40.

[0046] In some embodiments, the outer wall surface of the conical diversion portion 32 is parallel to the inner wall surface of the contraction cone 14. In specific implementation, a suitable ultra-smooth treatment process can be selected according to the material of the branch pipe 20. For example, if the branch pipe 20 is made of stainless steel, chemical polishing, electrochemical polishing or magnetic grinding polishing and other processes can be used; if the branch pipe 20 is made of polymer material, a mold with ultra-high finish can be used during injection molding or subsequent coating treatment and other processes can be performed. It can be understood that no matter what process is used, it is necessary to ensure that the smoothness of the inner wall surface of the branch pipe 20 meets the design requirements and will not adversely affect the structural strength and service life of the branch pipe 20. In this way, the inner wall surface of the branch pipe 20 has been ultra-smoothly treated, and the flow resistance of the slurry when flowing through the branch pipe 20 is greatly reduced. At the same time, the ultra-smooth inner wall surface also minimizes the friction and adsorption between the fiber and the tube wall, and avoids the fiber hanging on the wall and entanglement on the inner wall of the branch pipe. This not only ensures the uniformity and stability of the slurry flow rate of each branch pipe 20, but also reduces the risk of branch pipe blockage, so that the radial slurry distribution device can operate stably for a long time.

[0047] In some embodiments, Figure 3, Figure 5 As shown, it also includes a top cover 60, which is detachably mounted on the slurry return port 12, and is provided with a pipe joint 61 for slurry discharge. The cylindrical diverter portion 31 of the diverter 30 is connected to the top cover 60 through a support 62.

[0048] In specific implementation, the pipe joint 61 can be flanged, threaded or quick-connected to facilitate installation and removal of the pipe joint 61 with the return slurry port 12 and the return slurry pipeline; and the cylindrical diverter 31 of the diverter 30 is fixedly connected to the inner surface of the top cover 60 through one or more pillars 62. Specifically, the upper end of the pillar 62 can be welded, threaded or fixed to the inner surface of the top cover 60 by other means, and the lower end is fixedly connected to the top surface of the cylindrical diverter 31. In this embodiment, the number and arrangement of the pillars 62 can be selected according to the weight and size of the diverter 30 and the structural characteristics of the cylinder 10 to ensure the position accuracy and stability of the diverter 30 in the cylinder 10. For example, three or four pillars can be arranged equidistantly along the edge of the top surface of the cylindrical diverter 31.

[0049] In practical applications, when the radial slurry distribution device needs to be maintained, cleaned or overhauled, it is only necessary to remove the connecting piece (such as bolts or clamps) between the top cover 60 and the slurry return port 12, and the top cover 60 together with the diverter 30 can be taken out from the top of the cylinder 10. In this way, the staff can easily access the inside of the cylinder 10 to check, clean or replace various components. For example, the stepped hole 51 on the annular slurry distribution plate 50 can be checked and cleaned, and the sediment on the inner wall of the cylinder 10 and the surface of the diverter 30 can be removed, or the worn parts can be replaced. In addition, the pipe joint 61 on the top cover 60 provides a convenient connection point for the slurry return. Through the pipe joint 61, the excess slurry discharged from the slurry return port 12 can be led out and transported to the slurry circulation system in a centralized manner, thereby realizing the recycling of the slurry. At the same time, the design of the support 62 makes the installation and removal of the diverter 30 simpler and faster, without the need to perform the positioning and fixing operations of the diverter 30 separately, or replace the diverter 30 with different diameters to meet different process requirements.

[0050] The radial pulping device for wet forming of nanofibers provided in this embodiment effectively solves the technical problem that it is difficult for traditional radial pulping devices to achieve uniform lateral pulping of low-quantity fiber materials, especially under high online concentration and small online flow conditions. The device significantly optimizes the fluid dynamics characteristics of the slurry through the cylindrical structure combined with its internal cylindrical diversion part, conical diversion part and equal diameter and equal length branch pipe design. Even when the cylinder diameter is small, the number of branches is small, and the distance between adjacent branches is large, it can ensure that the slurry forms a stable and uniform flow in the interlayer space, so as to obtain consistent pressure and flow rate at the outlet of each branch pipe, eliminate the problems of slurry flocculation, deposition and uneven pulping caused by the slow slurry flow rate and uneven distribution of the traditional radial pulping device, and significantly improve the uniformity of the pulping of low-quantity nanofiber slurry and the stability of product quality. More importantly, the device has good adaptability to different types of low-quantity nanofiber materials. By adjusting the diversion structure or replacing components of different specifications, different production needs can be met, reducing production costs and improving economic benefits.

[0051] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. 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 invention 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 a limitation on the present invention.

[0052] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A radial pulping device for wet forming of nanofibers, characterized in that: include: A cylinder body, the bottom of which is provided with a pulp inlet; A plurality of branch pipes are provided on the outer wall surface of the cylinder and are arranged at equal intervals along the circumference of the cylinder, and the inner diameters of the plurality of branch pipes are all equal; A flow divider is provided on the cylinder, comprising a cylindrical flow divider coaxially arranged with the cylinder and a conical flow divider connected to the bottom end of the cylindrical flow divider, wherein an interlayer space is formed between the outer wall surfaces of the conical flow divider and the cylindrical flow divider and the inner wall surface of the cylinder; Wherein, each of the branch pipes is communicated with the interlayer space; the slurry enters the interlayer space from the slurry inlet and is discharged through the multiple branch pipes.

2. The radial pulping device for wet forming of nanofibers according to claim 1, characterized in that: A pulp return port is provided on the top of the cylinder, and the pulp inlet is connected to the pulp return port through the interlayer space.

3. The radial pulping device for wet forming of nanofibers according to claim 1 or 2, characterized in that: It also includes an annular pulp distributing plate arranged in the interlayer space, the inner wall surface of the annular pulp distributing plate is connected to the outer wall surface of the cylindrical diversion part, the outer wall surface of the annular pulp distributing plate is connected to the inner wall surface of the cylinder, and a plurality of stepped holes or gradually expanding holes are evenly spaced along the circumference of the cylinder on the plate surface of the annular pulp distributing plate, and the apertures of the stepped holes and gradually expanding holes tend to increase along the slurry flow direction in the interlayer space.

4. The radial pulping device for wet forming of nanofibers according to claim 3, characterized in that: The lower plate surface of the annular pulp distribution plate is coplanar with the bottom extension surface of the conical diverter portion.

5. The radial pulping device for wet forming of nanofibers according to claim 1 or 2, characterized in that: A diffusion cone is provided on the top of the cylinder, and the diameter of the diffusion cone gradually increases along the slurry flow direction; a truncated cone diversion portion is provided on the top of the cylindrical diversion portion, and the large bottom surface of the truncated cone diversion portion is connected to the cylindrical diversion portion, and the outer wall surface of the cylindrical diversion portion is parallel to the inner wall surface of the diffusion cone.

6. The radial pulping device for wet forming of nanofibers according to claim 1, characterized in that: The connection between the conical flow splitter and the cylindrical flow splitter is smoothly transitioned.

7. The radial pulping device for wet forming of nanofibers according to claim 1, characterized in that: The inner wall surface of the branch pipe is processed to be ultra-smooth.

8. The radial pulping device for wet forming of nanofibers according to claim 1 or 2, characterized in that: A contraction cone is provided at the bottom of the cylinder, and the slurry inlet is provided at the contraction cone; the outer wall surface of the conical diversion portion, the inner wall surface of the contraction cone, the outer wall surface of the cylindrical diversion portion and the inner wall surface of the cylinder together form the interlayer space.

9. The radial pulping device for wet forming of nanofibers according to claim 8, characterized in that: The outer wall surface of the conical splitter portion is parallel to the inner wall surface of the contraction cone portion.

10. The radial pulping device for wet forming of nanofibers according to claim 2, characterized in that: It also includes a top cover, which is detachably mounted on the slurry return port, and is provided with a pipe joint for slurry discharge, and the cylindrical diverter portion of the diverter is connected to the top cover through a support.

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