Radial slurry distribution device for nanofiber wet forming

Abstract

The application relates to a kind of nanofiber wet forming radial pulp distribution devices, comprising: cylinder, multiple branch pipes and shunt, shunt includes with cylinder coaxial arrangement cylindrical shunt part and is connected to the bottom end of cylindrical shunt part conical shunt part, and the outer wall surface between conical shunt part and cylindrical shunt part and the inner wall surface of cylinder forms interlayer space.The nanofiber wet forming radial pulp distribution device designed in the application, by the combination of cylindrical structure, its internal cylindrical shunt part, conical shunt part and equal-length branch pipe design, significantly optimizes the hydrodynamic characteristics of slurry, even in the case of small cylinder diameter, less branch pipe, large adjacent branch pipe spacing, can also ensure that slurry forms stable and uniform flow in the interlayer space, eliminates the problems such as slurry flocculation, deposition and uneven pulp distribution caused by slow slurry flow rate and uneven distribution in traditional radial pulp distributor, improves the uniformity of low basis weight nanofiber slurry distribution and the stability of product quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fiber material processing equipment, in particular to a radial pulp distribution device for nanofiber wet forming. BACKGROUND

[0002] In the field of fiber material processing, especially in today's growing demand for lightweight and high-performance materials, low basis weight fiber materials (such as those used in specialty paper, filtration materials, hygiene products, etc.) are increasingly widely used. However, the uniformity of pulp distribution during processing has always been a technical challenge. The pulp distributor of the fiber material flow box is one of the key equipment, and its performance directly affects the quality and production efficiency of the final product.

[0003] The main types of pulp distributors on the market currently include conical tube pulp distributors and radial pulp distributors (also known as cylindrical pulp distributors). Conical tube pulp distributors control the lateral distribution of pulp by gradually changing the cross-section in the width direction, but their structure is complex, the manufacturing cost is high, and the professional skills of the manufacturer are required, which limits their widespread application. Radial pulp distributors have gradually become the mainstream choice due to their simple structure and easy maintenance. A typical radial pulp distributor consists of a pulp inlet reducer, a stepped diffuser, a cylindrical barrel 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 cylindrical barrel and flows out through the multiple branch pipes evenly distributed on its circumference. Due to the geometric symmetry of the radial pulp distributor, it can effectively ensure the consistency of pulp flow rate, pressure, and state in theory, thereby improving the stability of production and product quality.

[0004] However, for the forming of low basis weight fiber material webs, especially at high wire concentrations, the wire flow is small. When using a radial pulp distributor for pulp distribution, in order to ensure a certain flow rate of the pulp in the cylindrical barrel, the diameter of the cylindrical barrel and the number of branch pipes arranged in the radial direction are small, and when the branch pipes connected to the headbox by hoses are arranged, the spacing between adjacent branch pipes is large, and it is not easy to achieve uniform and consistent lateral distribution of pulp in the headbox.

[0005] Although the existing radial pulp distributor meets the basic needs of the market to some extent, its defects become increasingly prominent when faced with the challenge of distributing low basis weight fiber materials, i.e., uneven pulp distribution can lead to fluctuations in product quality, affecting product performance and market competitiveness; inconvenient equipment maintenance can increase downtime and labor costs, reducing production efficiency; poor adaptability limits its application range and technical development potential. Therefore, developing a pulp distribution device that can efficiently and uniformly handle low basis weight fiber materials has become a technical problem to be solved. SUMMARY

[0006] In order to solve the above problems, the application provides a nanofiber wet forming radial pulp distribution device which significantly improves the pulp distribution uniformity and product quality of low basis weight fiber material under the condition of high pulp concentration and small pulp flow, and has the advantages of convenient maintenance, strong adaptability and high economic benefits.

[0007] In order to achieve the above purpose, the nanofiber wet forming radial pulp distribution device designed by the application comprises:

[0008] A cylinder body is provided with a pulp inlet at the bottom;

[0009] A plurality of branch pipes are arranged on the outer wall surface of the cylinder body and are equidistantly arranged along the circumference of the cylinder body, and the inner diameters of the plurality of branch pipes are equal;

[0010] A flow dividing member is arranged in the cylinder body, which comprises a cylindrical flow dividing part coaxially arranged with the cylinder body and a conical flow dividing part connected to the bottom end of the cylindrical flow dividing part, and the outer wall surface of the conical flow dividing part and the cylindrical flow dividing part and the inner wall surface of the cylinder body form a sandwiched space;

[0011] Each of the branch pipes is in communication with the sandwiched space; the pulp enters the sandwiched space from the pulp inlet and is discharged through the plurality of branch pipes.

[0012] In order to improve the utilization rate of the pulp and the uniformity of the pulp distribution, the top of the cylinder body is provided with a pulp return port, and the pulp inlet is communicated with the pulp return port through the sandwiched space.

[0013] In order to uniformly distribute the pulp flow, an annular pulp distribution plate is arranged in the sandwiched space, the inner wall surface of the annular pulp distribution plate is connected with the outer wall surface of the cylindrical flow dividing part, the outer wall surface of the annular pulp distribution plate is connected with the inner wall surface of the cylinder body, and a plurality of stepped holes or gradually expanding holes are equidistantly arranged on the plate surface of the annular pulp distribution plate along the circumference of the cylinder body, and the hole diameters of the stepped holes and the gradually expanding holes show an increasing trend along the direction of the pulp flow in the sandwiched space.

[0014] In order to avoid the generation of vortex or flow stagnation area, the lower plate surface of the annular pulp distribution plate is coplanar with the extension surface of the bottom surface of the conical flow dividing part.

[0015] In order to optimize the flow state of the pulp at the top of the cylinder body, a diffusion cone part is arranged at the top of the cylinder body, the diameter of the diffusion cone part gradually increases along the direction of the pulp flow; a circular truncated cone part is arranged at the top end of the cylindrical flow dividing part, the large bottom surface of the circular truncated cone part is connected with the cylindrical flow dividing part, and the outer wall surface of the cylindrical flow dividing part is parallel to the inner wall surface of the diffusion cone part; the pulp return port is arranged in the diffusion cone part.

[0016] In order to reduce the possibility of pulp flocculation, the connection between the conical flow dividing part and the cylindrical flow dividing part is smoothly transitioned.

[0017] In order to reduce the friction between the fiber and the pipe wall, avoid the fiber hanging wall and blocking, the inner wall surface of the branch pipe is subjected to super smooth treatment.

[0018] In order to guide the slurry to enter the interlayer space smoothly, the bottom of the cylinder is provided with a converging cone part, and the slurry inlet is arranged on the converging cone part; the outer wall surface of the conical distribution part, the inner wall surface of the converging cone part, the outer wall surface of the cylindrical distribution part and the inner wall surface of the cylinder jointly form the interlayer space.

[0019] Further, the outer wall surface of the conical distribution part is parallel to the inner wall surface of the converging cone part.

[0020] In order to facilitate the maintenance, cleaning and overhaul of the equipment, a top cover is further included, which is detachably mounted on the slurry return port, and a pipe joint for discharging slurry is arranged on the top cover, and the cylindrical distribution part of the distribution member is connected with the top cover through a support column.

[0021] The radial slurry distribution device for nanofiber wet forming designed in the application effectively solves the technical problem that the traditional radial slurry distributor is difficult to realize uniform transverse slurry distribution under the condition of low basis weight fiber material, especially under the condition of high web concentration and small web flow. The device, through the design of the cylinder structure combined with the internal cylindrical distribution part, the conical distribution part and the equal-diameter and equal-length branch pipes, significantly optimizes the hydrodynamic characteristics of the slurry, that is, even under the condition of small cylinder diameter, small number of branch pipes and large spacing between adjacent branch pipes, the stable and uniform flow of the slurry in the interlayer space can be ensured, so that consistent pressure and flow rate are obtained at the outlets of each branch pipe, and problems such as slurry flocculation, deposition and uneven distribution caused by slow slurry flow and uneven distribution of the traditional radial slurry distributor are eliminated, and the uniformity of low basis weight nanofiber slurry distribution and the stability of product quality are significantly improved. More importantly, the device has good adaptability to different types of low basis weight nanofiber materials, and by adjusting the structure of the distribution member or replacing different specifications of components, different production requirements can be met, the production cost is reduced, and the economic benefit is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structure schematic diagram of the radial slurry distribution device for nanofiber wet forming provided by an embodiment of the application.

[0023] Figure 2 is Figure 1 is a sectional view at A-A in

[0024] Figure 3 is a structure schematic diagram of the radial slurry distribution device for nanofiber wet forming provided by another embodiment of the application.

[0025] Figure 4It is a structure schematic diagram of a radial pulp distribution device for nanofiber wet forming provided in another embodiment of the present application.

[0026] Figure 5 It is a structure schematic diagram of a radial pulp distribution device for nanofiber wet forming provided in another embodiment of the present application.

[0027] Wherein, the cylinder 10, the pulp inlet 11, the pulp return port 12, the diffusion cone part 13, the contraction cone part 14, the branch pipe 20, the flow divider 30, the cylindrical flow dividing part 31, the conical flow dividing part 32, the circular table flow dividing part 33, the interlayer space 40, the annular pulp distribution plate 50, the stepped hole 51, the top cover 60, the pipe joint 61, the support column 62, the pulp inlet pipe 100, the variable diameter flow straightener 101, and the pulp return pipe 102. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0029] The embodiment of the present application provides a radial pulp distribution device for nanofiber wet forming, which is mainly applied to a low basis weight fiber material headbox, and aims to improve the uniformity and efficiency of low basis weight fiber pulp distribution in the width direction.

[0030] As shown in Figure 1 , Figure 2 , the radial pulp distribution device mainly comprises a cylinder 10, a plurality of branch pipes 20, and a flow divider 30.

[0031] The cylinder 10 is provided with a pulp inlet 11 at the bottom; the plurality of branch pipes 20 are arranged on the outer wall surface of the cylinder 10 and equidistantly spaced along the circumference of the cylinder 10, and the inner diameters of the plurality of branch pipes 20 are equal.

[0032] The cylinder 10 is the main structure of the device, and is provided with a pulp inlet 11 at the bottom for receiving pulp delivered by an external pulp inlet pipe 100. In the implementation, the pulp inlet pipe 100 can be connected to the pulp inlet 11 at the bottom of the cylinder 10 through a variable diameter flow straightener 101. In the embodiment, a gradually changing flow channel is arranged inside the variable diameter flow straightener 101, which can be designed as a cone or other shapes as needed, so as to adjust the initial speed and flow direction of the pulp and reduce the adverse effects of turbulence, so that the pulp is smoothly introduced into the inside of the cylinder 10; and the plurality of branch pipes 20 are equidistantly spaced along the circumference of the top of the cylinder 10, and the inner diameters and lengths of all the branch pipes 20 are equal. In the embodiment, a pipe joint, such as a quick joint or a flange joint, is arranged at the outlet of each branch pipe 20, so as to be connected with an external hose, and then the pulp is delivered to a receiving pipe in the headbox.

[0033] The cylinder body 10 is provided with a flow distribution member 30, which includes a cylindrical flow distribution part 31 coaxially arranged with the cylinder body 10 and a conical flow distribution part 32 connected to the bottom end of the cylindrical flow distribution part 31, and a space 40 is formed between the outer wall surface of the conical flow distribution part 32 and the cylindrical flow distribution part 31 and the inner wall surface of the cylinder body 10; each branch pipe 20 is in communication with the space 40; the pulp enters the space 40 through the pulp inlet 11 and is discharged through the plurality of branch pipes 20.

[0034] Specifically, the space 40 is formed between the outer wall surface of the conical flow distribution part 32 and the cylindrical flow distribution part 31 and the inner wall surface of the cylinder body 10, and the inlet of each branch pipe 20 is in communication with the space 40, so that the pulp can flow from bottom to top in the space 40, and the plurality of branch pipes 20 are uniformly distributed on the top edge of the cylinder body 10, and the distance between each branch pipe inlet and the flow distribution member 30 is equal, which ensures the uniform distribution of the pulp in the radial direction of the cylinder body 10. In this embodiment, the flow distribution member 30 can be made of corrosion-resistant and wear-resistant metal materials such as stainless steel and titanium alloy, and can be integrally formed by precision casting or mechanical processing to ensure its dimensional accuracy and surface finish.

[0035] In operation, the pulp first enters the reducer 101 through the pulp inlet pipe 100, and after pretreatment, the flow rate and flow direction of the pulp are adjusted, and then the pulp flows into the pulp inlet 11 at the bottom of the cylinder body 10 and enters the space 40. In the space 40, the pulp moves upward along the annular channel between the inner wall of the cylinder body 10 and the outer wall of the flow distribution member 30. Due to the smooth design of the inner wall of the space 40 and the outer surface of the flow distribution member 30, good flowability can be maintained even at a low pulp flow rate, avoiding the risk of blockage. When the pulp reaches the area where the conical flow distribution part 32 is located, the conical surface of the conical flow distribution part 32 cooperates with the cylindrical flow distribution part 31 to uniformly distribute the pulp to the inlets of the plurality of branch pipes 20, so that the pulp is distributed to different areas of the headbox through the plurality of branch pipes 20 under the joint action of its own gravity and pumping pressure, thereby achieving balanced laying of the pulp on the entire web.

[0036] In this embodiment, the connection between the conical flow distribution part 32 and the cylindrical flow distribution part 31 is smoothly transitioned. With this structural design, the smooth transition surface between the conical flow distribution part 32 and the cylindrical flow distribution part 31 reduces the resistance of the pulp flowing through this area, enabling the pulp to flow upward more smoothly, and also minimizing the possibility of fiber wall sticking and winding at the connection.

[0037] 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.

[0038] In some embodiments, as Figure 3 As shown, a slurry return port 12 is provided at the top of the cylinder 10, and the slurry inlet 11 is connected to the slurry return port 12 through the interlayer space 40. In specific implementation, the slurry return port 12 can be connected to the external slurry return pipe 102 through a flange or other suitable connection structure. This can return the excess slurry that has not been completely discharged by the branch pipe 20 and re-transport it back to the slurry inlet 11 through the slurry return pipeline (not shown in the figure), forming a slurry recycling, reducing slurry waste and improving raw material utilization. At the same time, the circulation of the slurry can further promote the mixing and dispersion of the slurry fibers. Especially for low-basis fiber slurry, the circulation can maintain 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 slurry return port 12 can serve as an exhaust port to discharge the gas in the slurry, preventing the gas from forming bubbles in the slurry, thereby reducing the quality defects such as pores and pinholes that may appear in the final product.

[0039] In another embodiment, to control the return slurry flow rate, a flow control valve, such as a ball valve, butterfly valve, or plunger valve, is typically installed in the return slurry pipeline. By adjusting the valve opening, the return slurry flow rate can be precisely controlled, thereby adjusting the slurry pressure and flow balance of the entire radial slurry distribution device. In some cases, to overcome resistance losses in the return slurry pipeline or to actively control the return slurry flow rate according to process requirements, a return slurry pump, such as a centrifugal pump or a screw pump, can also be installed in the return slurry pipeline.

[0040] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 As shown, it also includes an annular slurry distribution plate 50 arranged in the interlayer space 40, the inner wall surface of the annular slurry distribution plate 50 is connected to the outer wall surface of the cylindrical diversion part 31, and the outer wall surface of the annular slurry distribution 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 equidistantly spaced on the plate surface of the annular slurry distribution plate 50 along the circumference of the cylinder 10. The apertures of the stepped holes 51 and the gradually expanding holes increase along the slurry flow direction in the interlayer space.

[0041] 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 distribution portion 31, and is connected to the outer wall surface of the cylindrical distribution 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.

[0042] Specifically, a plurality of stepped holes 51 or gradually expanding holes are equidistantly spaced apart along the circumference of the cylinder 10 on the plate surface of the annular pulp distribution plate 50. Taking the stepped holes 51 as an example: the specific number, hole size and distribution density of these stepped holes 51 can be adjusted according to actual needs. For example, for low basis weight fiber pulp, the number and distribution density of the stepped holes 51 can be appropriately increased, and the hole size can be reduced to enhance the turbulence effect and dispersion effect. At the same time, the hole size of the stepped holes 51 gradually increases along the flow direction of the pulp, that is, the hole size of each stepped hole 51 is smaller on the side close to the pulp inlet 11, and the hole size is larger on the side close to the branch pipe 20. This design of gradually increasing hole size makes the pulp experience an acceleration and deceleration process when passing through each stepped hole 51, further intensifying the turbulence intensity, which helps to fully disperse the fibers and better adapt to the trend of gradually decreasing flow rate of the pulp during upward flow in the interlayer space 40.

[0043] In actual work, the annular pulp distribution plate 50 divides the interlayer space 40 into upper and lower parts. After the pulp enters the lower part of the interlayer space 40 from the pulp inlet 11, it first spreads to all directions under the guidance of the conical distribution portion 32. When the pulp encounters the obstruction of the annular pulp distribution plate 50, it must pass through the stepped holes 51 on the annular pulp distribution plate 50 to continue to flow upward. During this process, the pulp is forced to be mixed and dispersed again in the radial and circumferential directions, effectively eliminating the local flow rate difference caused by factors such as pulp inlet position and cylinder structure, making the pulp distribution more uniform throughout the cross section of the cylinder 10. At the same time, when the pulp flows through the stepped holes 51, due to the sudden change of flow area and the gradual increase of hole size, a strong turbulence effect is generated, which not only helps to fully disperse the fibers and prevent fiber agglomeration, but also enables the pulp to more fully fill the entire interlayer space 40, reducing the generation of flow dead zones and avoiding fiber deposition caused by too low flow rate in local areas.

[0044] In an optional embodiment, under certain specific process conditions, for example, when the slurry itself has good uniformity and fluidity, or when 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 in the direction of slurry flow, 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-processed 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.

[0045] It should be noted that the decision to remove the variable diameter rectifier 101 requires comprehensive consideration based on the slurry's characteristics, process conditions, and the requirements for slurry distribution uniformity. Generally, for low-fiber slurries, due to their low fiber content, turbulent mixing and dispersion requirements are higher, so retaining the variable diameter rectifier 101 is preferred to achieve better pretreatment results. However, for some high-concentration slurries or slurries with good inherent uniformity and fluidity, removing the variable diameter rectifier 101 may be considered to simplify the equipment structure and reduce manufacturing costs.

[0046] In some embodiments, as Figure 1 、 Figure 3 As shown, the lower surface of the annular slurry distribution plate 50 is coplanar with the bottom extension 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 guidance of the conical diverter 32, thereby avoiding sudden changes in the flow channel cross-sectional area and eliminating eddy currents and flow stagnation that may occur in this area.

[0047] In some embodiments, as 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 33 is provided at the top of the cylindrical diverter 31, and the large bottom surface of the truncated cone 33 is connected to the cylindrical diverter 31, and the outer wall surface of the cylindrical diverter 31 is parallel to the inner wall surface of the diffusion cone 13; the slurry return port 12 is provided in 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. 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 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.

[0048] In some embodiments, the inner wall surface of the branch pipe 20 is subjected to ultra-smooth treatment.

[0049] In some embodiments, as 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 together form the interlayer space 40.

[0050] 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 can be used; if the branch pipe 20 is made of polymer material, ultra-high finish molds can be used during injection molding or subsequent coating treatment 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 does 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 pipe wall, avoiding 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.

[0051] In some embodiments, as Figure 3、 Figure 5 The device also includes a top cover 60, which is detachably mounted on the pulp return port 12, and the top cover 60 is provided with a pipe joint 61 for discharging pulp. The cylindrical distribution part 31 of the distribution member 30 is connected to the top cover 60 through a support 62.

[0052] In a specific implementation, the pipe joint 61 can be connected by flange, thread or quick connector, etc. to facilitate its installation and dismounting with the pulp return port 12 and the pulp return pipeline. The cylindrical distribution part 31 of the distribution member 30 is fixedly connected to the inner surface of the top cover 60 through one or more supports 62. Specifically, the upper end of the support 62 can be welded, threaded or fixed by other means to the inner surface of the top cover 60, and the lower end is fixedly connected to the top surface of the cylindrical distribution part 31. In this embodiment, the number and arrangement of the supports 62 can be selected according to the weight and size of the distribution member 30 and the structural characteristics of the cylinder 10 to ensure the positional accuracy and stability of the distribution member 30 in the cylinder 10. For example, three or four supports can be equidistantly arranged along the edge of the top surface of the cylindrical distribution part 31.

[0053] In actual application, when the radial pulp distribution device needs to be maintained, cleaned or overhauled, only the connecting member (such as bolt or clamp) between the top cover 60 and the pulp return port 12 needs to be dismounted, and then the top cover 60 together with the distribution member 30 can be taken out from the top of the cylinder 10, so that the workers can conveniently access the inside of the cylinder 10 to check, clean or replace the components, for example, to check and clean the stepped holes 51 on the annular pulp distribution plate 50, to remove the deposits on the inner wall of the cylinder 10 and the surface of the distribution member 30, or to replace the worn parts. In addition, the pipe joint 61 on the top cover 60 provides a convenient connection point for the pulp return, through which the excess pulp discharged from the pulp return port 12 can be led out and centrally transported to the pulp circulation system, so as to realize the recycling of the pulp. At the same time, the design of the support 62 makes the installation and dismounting of the distribution member 30 more simple and fast, without the need for separate positioning and fixing operations of the distribution member 30, or replacing the distribution member 30 of different diameters to meet different process requirements.

[0054] The radial pulp distribution device for nanofiber wet forming provided by the embodiment effectively solves the technical problem that the traditional radial pulp distribution device is difficult to realize uniform transverse pulp distribution, especially under the condition of high pulp concentration and small pulp flow rate of low basis weight fiber material. The device significantly optimizes the hydrodynamic characteristics of the pulp by the combination of the cylinder structure, the internal cylindrical flow dividing part, the conical flow dividing part and the equal-diameter and equal-length branch pipes, so that stable and uniform flow of the pulp in the interlayer space can be ensured even under the condition of small cylinder diameter, small number of branch pipes and large spacing between adjacent branch pipes, thereby obtaining consistent pressure and flow rate at the outlets of the branch pipes and eliminating the problems of pulp flocculation, deposition and uneven pulp distribution caused by slow pulp flow rate and uneven distribution of the traditional radial pulp distribution device, and the uniformity of pulp distribution and the stability of product quality of the low basis weight nanofiber pulp are significantly improved. More importantly, the device has good adaptability to different types of low basis weight nanofiber materials, and different production requirements can be met by adjusting the structure of the flow dividing part or replacing components of different specifications, thereby reducing production cost and improving economic benefit.

[0055] In the description of the present application, it should be pointed out that the orientations or positional relationships indicated by the terms "vertical", "upper", "lower", "horizontal" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0056] In the description of the present application, it should be further pointed out that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] Finally, it should be pointed out that: the above only describes the preferred embodiments of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A radial slurry dispensing device for wet forming of nanofibers, characterized in that: include: The cylinder has a pulp inlet at its bottom; 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 dividing member is provided on the cylinder, comprising a cylindrical flow dividing portion coaxially arranged with the cylinder and a conical flow dividing portion connected to the bottom end of the cylindrical flow dividing portion, wherein an interlayer space is formed between the outer wall surfaces of the conical flow dividing portion and the cylindrical flow dividing portion and the inner wall surface of the cylinder; Each of the branch pipes is connected to the interlayer space; the slurry enters the interlayer space from the slurry inlet and is discharged through the plurality of branch pipes; It also includes an annular pulp distribution plate arranged in the interlayer space, the inner wall surface of the annular pulp distribution plate is connected to the outer wall surface of the cylindrical diversion part, the outer wall surface of the annular pulp distribution plate is connected to the inner wall surface of the cylinder, and a plurality of stepped holes or gradually expanding holes are equidistantly spaced along the circumference of the cylinder on the plate surface of the annular pulp distribution plate, and the apertures of the stepped holes and gradually expanding holes tend to increase along the slurry flow direction in the interlayer space.

2. The radial slurry dispensing 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 nanofibers according to claim 2, 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.

4. The radial pulping device for wet forming 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 flow direction of the slurry; a conical diversion portion is provided on the top of the cylindrical diversion portion, 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.

5. The radial slurry dispensing device for wet forming of nanofibers according to claim 1, characterized in that: The connection between the conical diverter and the cylindrical diverter is smoothly transitioned.

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

7. The radial pulping device for wet forming 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.

8. The radial pulping device for wet forming nanofibers according to claim 7, characterized in that: The outer wall surface of the conical diverter portion is parallel to the inner wall surface of the contraction cone portion.

9. The radial pulping device for wet forming 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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