stirring paddle

Abstract

The application relates to a stirring paddle, which comprises a plurality of paddle blades arranged at intervals along the circumferential direction of the rotating axis of the stirring paddle, and the paddle blades are provided with fractal structures, the fractal structures have hollowed-out areas and solid areas, and the shearing length of the solid areas and / or the cross-sectional area of the solid areas increase with the increase of the iteration number of the fractal structures. Thus, the fractal structures can shear fluid to generate high-speed jets and destroy the trailing vortex structure. Meanwhile, with the increase of the iteration number of the fractal structures, the interaction cross-sectional area of the paddle blades and the pseudoplastic fluid can be increased, the shearing length of the solid areas can be increased, the shearing stirring range of the paddle blades on the pseudoplastic fluid can be expanded, the shearing force of the paddle blades on the pseudoplastic fluid can be enhanced, the transmission efficiency between the cavity area and the stagnant area of fluid can be improved, the cavity area can be increased and the stagnant area can be reduced, and the mixing efficiency of the pseudoplastic fluid can be improved.

Description

Technical Field

[0001] This application relates to the field of fluid mixing technology, and more particularly to a stirring paddle. Background Technology

[0002] Non-Newtonian fluids constitute a large proportion of the mixing medium, with pseudoplastic fluids being the most common. Pseudoplastic fluids are frequently used in biopharmaceuticals, food processing, and polymer polymerization. Pseudoplastic fluids exhibit characteristics such as initial yield stress and shear thinning. During mixing operations, the viscosity of the pseudoplastic fluid near the impeller decreases due to the shearing force of the impeller blades, thus enhancing its fluidity and resulting in a strong mixing zone known as a "cavity." Conversely, the pseudoplastic fluid further away from the impeller experiences less shear force from the blades, resulting in little or no decrease in viscosity and a slow or even stagnant flow, known as a "stagnant zone." The presence of stagnant zones severely hinders the mass and heat transfer rates and efficiency between materials.

[0003] In existing technologies, when stirring fluids, some impellers incorporate fractal structures on their blades that can be iterated to reduce the wake vortex structure formed behind the blades during mixing, thereby improving mixing efficiency. However, when these impellers stir pseudoplastic fluids, a large stagnation zone still exists in the pseudoplastic fluid mixing flow field, preventing the mixing efficiency from being improved. Summary of the Invention

[0004] This application provides a stirring impeller to solve the technical problem of low efficiency in stirring pseudoplastic fluids in the prior art.

[0005] This application provides a stirring impeller, including multiple blades, which are spaced apart circumferentially along the rotation axis of the impeller. Each blade has a fractal structure, which has a hollow region and a solid region. As the number of iterations of the fractal structure increases, the shear perimeter of the solid region increases; and / or, the cross-sectional area of ​​the solid region increases.

[0006] The technical solutions provided in this application have the following advantages compared with the prior art:

[0007] The stirring impeller provided in this embodiment, when multiple blades rotate, utilizes a fractal structure on the blades to shear the fluid, generating a high-speed jet, disrupting the wake vortex structure, increasing fluid turbulence intensity, and enhancing energy dispersion. Simultaneously, as the number of iterations of the fractal structure increases, the shear perimeter and cross-sectional area of ​​the solid region increase, thereby increasing the interaction cross-section between the blades and the pseudoplastic fluid, as well as the shear perimeter of the blades' outer edge on the pseudoplastic fluid. This expands the shearing and stirring range of the blades on the pseudoplastic fluid, enhances the shearing force of the blades on the pseudoplastic fluid, improves the transfer efficiency between the cavity and stagnation zones, helps to increase the cavity zone and decrease the stagnation zone, shortens the mixing time of the pseudoplastic fluid, and improves the mixing efficiency. Furthermore, as the number of iterations of the fractal structure increases, the cross-sectional area of ​​the solid region increases, which can improve structural strength and allow the blades to withstand greater loads.

[0008] In some embodiments, the initial structure of the fractal structure includes: a first hollow area surrounding the outer periphery of the solid area; and a second hollow area connected to the first hollow area, wherein a portion of one side edge of the solid area protrudes toward the other side edge of the solid area to form the second hollow area.

[0009] In some embodiments, the first cutout area is a square ring, and / or the second cutout area is a square.

[0010] In some embodiments, the initial structure of the fractal structure has first to ninth center points located at the centers of nine first squares arranged in multiple rows and columns, the nine first squares together forming a square array, and the first to ninth center points being connected sequentially.

[0011] In some embodiments, a first center point of the center of the first square array located in the first column of the third row is connected to a second center point of the center of the first square located in the second column of the third row; the second center point is connected to a third center point of the center of the first square located in the second column of the second row; the third center point is connected to a fourth center point of the center of the first square located in the second column of the first row; the fourth center point is connected to a fifth center point of the center of the first square located in the first column of the first row; the fifth center point is connected to a sixth center point of the center of the first square located in the second column of the first row; the sixth center point is connected to a seventh center point of the center of the first square located in the third column of the first row; the seventh center point is connected to an eighth center point of the center of the first square located in the third column of the second row; and the eighth center point is connected to a ninth center point of the center of the third column of the third row.

[0012] In some embodiments, at least one of the initial structures is subjected to at least one of flipping and rotation to form a fractal structure of one fractal iteration.

[0013] In some embodiments, the side length of the (n+1)th square after the initial fractal iteration is 1 / 3 of the total side length of the square array. n+1 The product is multiplied by n, where n is the number of iterations.

[0014] In some embodiments, the impeller further includes: a drive member having a stirring shaft at its lower end; a fixing sleeve fitted over the stirring shaft; a disc having a perforation, the fixing sleeve passing through the perforation, and a plurality of impeller blades connected to the outer periphery of the disc.

[0015] In some embodiments, the blade includes a connected mounting portion and a stirring portion, the stirring portion being connected to the outer side of the mounting portion along the radial direction of the disk, the blade being fixedly connected to the disk via the mounting portion, and the fractal structure being formed in the stirring portion.

[0016] In some embodiments, the fractal structure covers the stirring part, and the stirring part and the mounting part satisfy at least one of the following conditions: the length of the mounting part is the same as the length of the stirring part; the thickness of the mounting part is the same as the thickness of the stirring part; the width of the mounting part is 1 / 10 to 1 / 3 times the width of the stirring part. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0020] Figure 1 This is a schematic diagram of the structure of the stirring paddle provided in the embodiments of this application;

[0021] Figure 2 A perspective view of the stirring paddle and stirring tank provided in the embodiments of this application;

[0022] Figure 3 This is a schematic diagram of the structure of a propeller blade with an initial fractal structure provided in an embodiment of this application;

[0023] Figure 4 A schematic diagram of a propeller blade with a fractal structure having one iteration, provided for an embodiment of this application;

[0024] Figure 5 A schematic diagram of a propeller blade with a fractal structure having a secondary iteration provided for an embodiment of this application;

[0025] Figure 6 This is a schematic diagram of the initial structure of the fractal structure provided in the embodiments of this application;

[0026] Figure 7 A schematic diagram of a fractal structure for a single iteration provided in an embodiment of this application;

[0027] Figure 8 A schematic diagram of the fractal structure with secondary iteration provided in the embodiments of this application;

[0028] Figure 9 for Figure 8 A magnified view of point A.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100. Agitator; 200. Mixing tank; 300. Baffle;

[0031] 10. Blade; 11. Mounting section; 12. Mixing section;

[0032] 20. Initial structure; 21. First center point; 22. Second center point; 23. Third center point; 24. Fourth center point; 25. Fifth center point; 26. Sixth center point; 27. Seventh center point; 28. Eighth center point; 29. ​​Ninth center point; 20A. First hollow area; 20B. Second hollow area; 20C. Solid area;

[0033] 30. First square; 40. Square array; 50. Drive component; 60. Stirring shaft; 70. Fixing sleeve; 80. Disc; 81. Perforation; 90. Second square. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0036] In the description of this application, "multiple" means two or more.

[0037] In order to solve the technical problem of low stirring efficiency of existing impellers for stirring pseudoplastic fluids, this application provides an impeller 100, which includes a plurality of blades 10.

[0038] Specifically, such as Figures 1-9 As shown, multiple impeller blades 10 are spaced apart circumferentially along the rotation axis of the stirring paddle 100. Each impeller blade 10 has a fractal structure, which includes a hollow region and a solid region 20C. As the number of iterations of the fractal structure increases, the shear perimeter of the solid region 20C increases, and / or the cross-sectional area of ​​the solid region 20C increases. For example, the impeller blade 10 can be constructed as a sheet, and as the number of iterations of the fractal structure increases, the shear perimeter of the solid region 20C increases; or, as the number of iterations of the fractal structure increases, the cross-sectional area of ​​the solid region 20C increases; furthermore, as the number of iterations of the fractal structure increases, the shear perimeter of the solid region 20C increases, and the cross-sectional area of ​​the solid region 20C also increases. Each impeller blade 10 may have a fractal structure; or, only one impeller blade 10 may have a fractal structure. The specific configuration can be determined according to the actual situation and is not limited here.

[0039] It should be noted that a "fractal structure" is a structure that can be generated by fractal iteration based on the initial structure 20 to produce the next generation. Fractal structures have self-similarity and fractal properties. "Shear perimeter" refers to the sum of the lengths of the edges of the solid region 20C used for shearing the fluid.

[0040] Traditional impellers tend to form large wake structures behind the impeller blades during fluid mixing, where most of the blade's energy is consumed. The turbulence intensity is high near the impeller and low further away, resulting in low energy transfer efficiency and poor mixing. To address this, existing technologies incorporate fractal structures on the impeller blades to create jets, thereby disrupting the wake structure and reducing energy loss at the wake, thus improving mixing efficiency and effect. However, the applicant has found that when using impellers to mix pseudoplastic fluids, existing impellers fail to improve mixing efficiency with increasing fractal structure iterations. This is because the cross-sectional area or mixing range of the fractal structure impellers in existing technologies does not increase with increasing fractal iterations, and may even decrease. Consequently, the cross-section of the impeller interacting with the fluid and the shear mixing range cannot be increased or even decreased, failing to enlarge the cavity area or reduce the stagnation area. Therefore, when the above-mentioned stirring impeller is applied to pseudoplastic fluid mixing, a large stagnation zone still exists in the flow field of pseudoplastic fluid mixing as the number of fractal structure iterations increases.

[0041] In this embodiment, the impeller 100 has multiple blades 10 that can rotate along its rotation axis. The fractal structure shears the fluid to generate a high-speed jet, disrupting the wake structure, increasing fluid turbulence intensity, and enhancing energy dispersion. Simultaneously, with increasing iterations of the fractal structure, the shear perimeter, cross-sectional area, and stirring range of the solid region 20C increase. This increases the interaction cross-section between the blades 10 and the pseudoplastic fluid, the shear perimeter of the fractal structure on the pseudoplastic fluid, expands the shearing and stirring range of the blades 10 on the pseudoplastic fluid, enhances the shearing force of the blades 10 on the pseudoplastic fluid, improves the transfer efficiency between the cavity and stagnant zones, helps to increase the cavity zone and decrease the stagnant zone, shortens the mixing time of the pseudoplastic fluid, and improves the mixing efficiency. Furthermore, with increasing iterations of the fractal structure, the cross-sectional area of ​​the solid region 20C increases, which can improve structural strength and allow the blades 10 to withstand greater loads.

[0042] For example, the stirring paddle 100 in this embodiment can stir fluids with a viscosity range of 0.5 Pa·s to 5 Pa·s, and has a good mixing effect and high stirring efficiency.

[0043] In some embodiments, such as Figure 3 and Figure 6As shown, the initial structure 20 of the fractal structure has a hollowed-out area including a first hollowed-out area 20A and a second hollowed-out area 20B. The first hollowed-out area 20A can be constructed as a ring. The first hollowed-out area 20A surrounds the outer periphery of the solid area 20C. The first hollowed-out area 20A is connected to the second hollowed-out area 20B. A portion of one side edge of the solid area 20C protrudes toward the other side edge of the solid area 20C to form the second hollowed-out area 20B.

[0044] It should be noted that, in the actual processing, the hollowed-out area of ​​the fractal structure on the outermost periphery of the blade 10 can be omitted.

[0045] In some embodiments, the first cutout region 20A is a square ring, and / or the second cutout region 20B is a square. This allows the solid region 20C of the initial structure 20 to be constructed in an "L" shape.

[0046] In some embodiments, such as Figure 3 and Figure 6 As shown, the initial structure 20 of the fractal structure has a first center point 21, a second center point 22, a third center point 23, a fourth center point 24, a fifth center point 25, a sixth center point 26, a seventh center point 27, an eighth center point 28, and a ninth center point 29 located at the center of nine first squares 30 arranged in multiple rows and columns. The nine first squares 30 together construct a square array 40, and the first to ninth center points 29 are connected in sequence to form the initial structure 20.

[0047] It should be noted that the first square 30 and the square array 40 are auxiliary graphics for forming the solid region of the fractal structure, and are not solid structures themselves. After the first iteration of the fractal structure, each first square 30 has nine second squares 90 arranged in multiple rows and columns, and so on, until after the nth iteration of the fractal structure, each nth square has nine (n+1)th squares arranged in multiple rows and columns.

[0048] In some embodiments, such as Figure 6As shown, the first center point 21 of the first square 30 located in the first column of the third row is connected to the second center point 22 of the first square 30 located in the second column of the third row. The second center point 22 is connected to the third center point 23 of the first square 30 located in the second column of the second row. The third center point 23 is connected to the fourth center point 24 of the first square 30 located in the second column of the first row. The fourth center point 24 is connected to the fifth center point 25 of the first square 30 located in the first column of the first row. The fifth center point 25 is connected to the sixth center point 26 of the first square 30 located in the second column of the first row. The sixth center point 26 is connected to the seventh center point 27 of the first square 30 located in the third column of the first row. The seventh center point 27 is connected to the eighth center point 28 of the first square 30 located in the third column of the second row. The eighth center point 28 is connected to the ninth center point 29 of the third column of the third row.

[0049] For example, such as Figure 6 As shown, an original square is divided into nine smaller squares, that is, the square array 40 is divided into nine first squares 30 arranged in multiple rows and columns. Starting from the center of the first square 30 on the left of the bottom row, go right to the center of the first square 30 in the middle of the bottom row, then vertically up to the center of the first square 30 in the middle of the middle row, then left to the center of the first square 30 on the left of the middle row, then vertically up to the center of the first square 30 on the left of the top row, then right through the centers of the first squares 30 in the middle and right of the top row, and then vertically down through the centers of the first squares 30 in the right of the middle row and the right of the bottom row, to obtain the initial structure 20.

[0050] Furthermore, at least one initial structure 20 is flipped and rotated at least once to form a fractal structure for one fractal iteration. That is, following the formation process of the initial structure 20 described above, flipping or rotating the initial structure 20, or flipping and rotating it and then connecting them end-to-end, yields the fractal structure for the first fractal iteration. To ensure that multiple initial structures 20 can be connected end-to-end by line segments parallel or perpendicular to the edges of the square array 40 to form the fractal structure for the first fractal iteration, the initial structure 20 can be flipped and rotated. This arrangement helps to increase the cross-sectional area and shear perimeter of the fractal structure, thereby improving the mixing efficiency. Simultaneously, the structural stability and reliability of the fractal structure are better.

[0051] In some embodiments, the side length of the (n+1)th square after the initial fractal iteration is 1 / 3 of the total side length of the square array 40. n+1The value is multiplied by n, where n is the number of iterations of the fractal structure. The maximum side length of a single unit in the current fractal structure is 1 / 3 times the maximum side length of the fractal structure in the previous iteration. It can be understood that the total side length of the square array 40 after the fractal structure iterations remains constant. Therefore, as the number of fractal structure iterations increases, the shear perimeter of the solid region 20C increases, and the cross-sectional area of ​​the solid region 20C increases, thereby improving the mixing efficiency.

[0052] In some embodiments, such as Figure 1 and Figure 2 As shown, the stirring paddle 100 includes a driving component 50, a fixed sleeve 70, and a disc 80. The lower end of the driving component 50 has a stirring shaft 60; the fixed sleeve 70 is fitted over the stirring shaft 60; the disc 80 has a through hole 81, through which the fixed sleeve 70 passes, and multiple blades 10 are connected to the outer periphery of the disc 80. Thus, the driving component 50 can drive the disc 80 to rotate via the fixed sleeve 70, thereby causing the disc 80 to drive the multiple blades 10 to rotate, thereby stirring the fluid. For example, the driving component 50 can be a motor, and the multiple blades 10 are spaced apart and evenly arranged on the disc 80 along its circumferential direction, with the rotation axis of the blades 10 coinciding with the rotation axis of the disc 80 to ensure a good stirring effect.

[0053] In some embodiments, such as Figure 1 As shown, the impeller 10 includes a connected mounting portion 11 and a stirring portion 12. The stirring portion 12 is connected to the outer side of the mounting portion 11 along the radial direction of the disk 80. The impeller 10 is fixedly connected to the disk 80 through the mounting portion 11, and a fractal structure is formed on the stirring portion 12. For example, the disk 80 is connected to the mounting portion 11 by welding, and the width of the weld is the width of the mounting portion 11. The two sides of the fractal structure are flush with the edges of the two sides of the stirring portion 12 along the radial direction of the disk 80 to prevent interference between the mounting structure and the fractal structure.

[0054] In some embodiments, the fractal structure covers the stirring section 12, and the stirring section 12 and the mounting section 11 satisfy at least one of the following conditions: the length of the stirring section 12 is the same as the length of the mounting section 11; the thickness of the stirring section 12 is the same as the thickness of the mounting section 11; and the width of the mounting section 11 is 1 / 10 to 1 / 3 times the width of the stirring section 12. Here, "length" refers to the direction parallel to the stirring shaft 60. "Width" refers to the direction perpendicular to the stirring shaft 60. Thus, when the above conditions are met, it is beneficial to ensure the flatness of the outer surface of the blade 10 to ensure the area of ​​the interaction section between the blade 10 and the fluid. The thickness of the stirring section 12 is the same as the thickness of the mounting section 11, and the width of the mounting section 11 is 1 / 10 to 1 / 3 times the width of the stirring section 12. This ensures that the width of the stirring section 12 is reasonable, the structural strength and installation stability of the blade 10 are guaranteed, and the size of the fractal structure is relatively large, thereby improving the stirring efficiency.

[0055] Reference Figure 3 , Figure 4 and combined Figure 6 and Figure 7 The stirring paddle 100 of this application embodiment is described using a fractal structure of a single fractal iteration as an example, with reference to... Figure 6 The figure shows the initial fractal structure 20. The total side length L0 of the square array 40 is 5.4 cm. The nine first squares 30 arranged in multiple rows and columns have the same side length L1, which is L1 = 1.8 cm. Based on the initial structure 20, the first fractal iteration is performed to form the structure shown in the figure. Figure 7 The fractal structure shown is an example of a single iteration. Figure 7 As shown, the total side length L0 of the square array 40 is 5.4 cm. Nine second squares 90 arranged in multiple rows and columns together construct the first square 30. The side length L2 of the second square 90 is 1 / 3 times L1, that is, L2 = 0.6 cm. The maximum side length of a single fractal unit of the solid region 20C of the fractal structure in one iteration is 1 / 3 times the maximum side length of the solid region 20C of the initial structure 20. The maximum side length of the solid region 20C of the initial structure 20 (that is, the distance between two opposite edges of the solid region 20C) is 3.6 cm. The shear perimeter of the solid region 20C of the initial structure 20 is 14.4 cm, and the cross-sectional area of ​​the solid region 20C of the initial structure 20 is 9.72 cm². 2 The maximum side length of the outer contour of the solid region 20C of the fractal structure in one iteration (i.e., the distance between two opposite edges of the solid region 20C) is 4.8 cm, the shear perimeter of the solid region 20C of the fractal structure in one iteration is 48 cm, and the cross-sectional area of ​​the solid region 20C of the fractal structure in one iteration is 12.96 cm². 2 In other words, as the number of fractal iterations increases, the distance between the two opposite edges of the solid region 20C gradually increases, which is beneficial for increasing the shear perimeter of the solid region 20C, increasing its cross-sectional area, and improving stirring efficiency. The cross-sectional area of ​​the solid region 20C in the nth fractal iteration is approximately three times that of the solid region 20C in the first fractal iteration. The length LA2 of the fractal structure in the first iteration and the length of the mounting part 11 connected to it are the same, both being 4.8 cm. The width L of the mounting part 11 is... B =1.04cm, approximately 1 / 5 of the side length of the square array 40. The thickness of the fractal structure in one fractal iteration is the same as the thickness of the mounting part 11 connected to it. The specific value can be flexibly set according to actual needs and is not limited here.

[0056] The applicant conducted a comparative experiment 1 using the stirring impeller 100 of the above-mentioned technical solution and stirring impellers in related technologies. The experimental results are shown in Table 1. Table 1 is a data table of the comparative experiment of acid-base decolorization using the stirring impeller 100 with a fractal structure having one iteration.

[0057] Table 1

[0058]

[0059] See Figure 2 The stirring shaft 60 is driven by a motor, a fixed sleeve 70 is fitted over the stirring shaft 60, a disc 80 is fitted over the fixed sleeve 70, and a blade 10 is connected to the outer periphery of the disc 80. The stirring blade 100 mixes and stirs the fluid in the stirring tank 200. The stirring tank 200 has a diameter of 0.48 m, a height of 1 m, a baffle 300 width of 0.048 m, and a liquid height maintained at 0.5 m. The liquid is a 1.4% xanthan gum solution. Acid-base decolorization experiments were conducted under different rotational speeds. The experimental results are shown in Table 1. As can be seen from the acid-base decolorization experiment results in Table 1, under stirring speeds of 70 rpm, 130 rpm, and 190 rpm, compared with conventional straight-blade stirring blades, the mixing time of the stirring blade 100 in the first fractal iteration of the above-mentioned technical solution of this application is shortened by 9.34%, 14.60%, and 19.03%, respectively, indicating high mixing efficiency.

[0060] The following reference Figure 3 , Figure 5 and combined Figure 7 , Figure 9 The stirring paddle 100 of this application embodiment is described using a second fractal iteration as an example. Figure 3 and Figure 5 As shown, the side length L0 of the square array 40 is 5.4 cm. The initial structure 20 is formed in nine first squares 30, each with a side length L1 of 1.8 cm. Then, a second fractal iteration is performed. The side length L3 of the third square formed after the second fractal iteration is 1 / 9 of L1. The side length of the resulting fractal structure is 1 / 3 of the side length of the fractal structure obtained in the first fractal iteration. The total side length of the solid region 20C of the fractal structure obtained in the second fractal iteration (i.e., the distance between two opposite edges of the solid region 20C) is 5.2 cm. The shear perimeter of the solid region 20C is 145.6 cm, and the cross-sectional area of ​​the solid region 20C is 14.04 cm². 2 .

[0061] The length L of the fractal structure in the second fractal iteration A3 The length of the mounting part 11 connected to it is the same, and both are 5.2cm. The width L of the mounting part 11 is... BThe thickness is 1.04 cm, which is 1 / 5 of the side length of the square array 40. The thickness of the mounting part 11 is the same as the thickness of the fractal structure. It can be set according to actual needs and is not limited here.

[0062] The applicant conducted a comparative experiment 2 using the stirring impeller 100 of the above-mentioned technical solution and stirring impellers in related technologies. The experimental results are shown in Table 2. Table 2 is a data table of the comparative experiment of acid-base decolorization using the stirring impeller 100 with a fractal structure having a secondary iteration.

[0063] Table 2

[0064]

[0065]

[0066] See Figure 3 The stirring shaft 60 is driven by a motor, a fixed sleeve 70 is fitted over the stirring shaft 60, a disc 80 is fitted over the fixed sleeve 70, and a blade 10 is connected to the outer periphery of the disc 80. The stirring blade 100 mixes and stirs the fluid in the stirring tank 200. The stirring tank 200 has a diameter of 0.48 m, a height of 1 m, a baffle 300 width of 0.048 m, and a liquid height maintained at 0.5 m. The liquid is a 1.4% xanthan gum solution. Acid-base decolorization experiments were conducted under different rotational speeds. The experimental results are shown in Table 2. As can be seen from the acid-base decolorization experiment results in Table 2, under stirring speeds of 70 rpm, 130 rpm, and 190 rpm, the fractal stirring blade 100 with secondary fractal iteration disclosed in this application, compared with a conventional straight-blade stirring blade, shortened the mixing time of the mixing system by 16.72%, 24.33%, and 32.02%, respectively.

[0067] As can be seen from the above technical solutions, the stirring impeller 100 of this application embodiment has the following technical effects compared with the stirring impeller of the prior art: by setting multiple impeller blades 10 with fractal structures, the impeller blades 10 can shear the fluid through the fractal structure during rotation, generate many high-speed jets, destroy the tail vortex structure of the impeller blades 10, increase the fluid turbulence intensity, and enhance the energy dispersion process. At the same time, by increasing the number of fractal iterations of the impeller blades 10, the cross-sectional area of ​​the interaction between the impeller blades 10 and the pseudoplastic fluid and the shearing perimeter of the outer edge of the impeller blades 10 on the pseudoplastic fluid are increased, the shearing and stirring range of the impeller blades 10 on the pseudoplastic fluid is expanded, the shearing force of the impeller blades 10 on the pseudoplastic fluid is enhanced, the transfer efficiency between the fluid in the cavern area and the stagnant area is improved, the mixing time of the pseudoplastic fluid is shortened, and the mixing efficiency of the pseudoplastic fluid is improved.

[0068] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "center," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer." Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0069] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0070] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0071] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0072] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A stirring paddle, characterized in that, It includes multiple blades, which are spaced apart along the circumferential direction of the rotation axis of the stirring paddle. Each blade has a fractal structure, which has a hollow area and a solid area. As the number of iterations of the fractal structure increases, the shear perimeter of the solid area increases, and / or the cross-sectional area of ​​the solid area increases. The initial structure of the fractal structure includes a first hollow area and a second hollow area. The first hollow area surrounds the outer periphery of the solid area. The first hollow area is connected to the second hollow area. A portion of one side edge of the solid area protrudes towards the other side edge of the solid area to form the second hollow area. The first hollow area is a square ring, and / or the second hollow area is a square. The initial structure of the fractal structure has first to ninth center points located at the centers of nine first squares arranged in multiple rows and columns. The nine first squares together construct a square array, and the first to ninth center points are connected sequentially. The first center point of the first square array located in the first column of the third row is connected to the second center point of the first square located in the second column of the third row. The second center point is connected to the first square located in the second column of the second row. The third center point of the square is connected to the fourth center point of the first square located in the second column of the first row. The fourth center point is connected to the fifth center point of the first square located in the first column of the first row. The fifth center point is connected to the sixth center point of the first square located in the second column of the first row. The sixth center point is connected to the seventh center point of the first square located in the third column of the first row. The seventh center point is connected to the eighth center point of the first square located in the third column of the second row. The eighth center point is connected to the ninth center point of the first square located in the third column of the third row. At least one of the initial structures is flipped and rotated to form a fractal structure after one fractal iteration. The side length of the (n+1)th square after the fractal iteration of the initial structure is the total side length of the square array. The number of iterations of the fractal structure is n, where n is the number of iterations of the fractal structure.

2. The stirring paddle according to claim 1, characterized in that, Also includes: A driving component, the lower end of which has a stirring shaft; A fixing sleeve is fitted over the stirring shaft; A disc having a perforation, a fixing sleeve passing through the perforation, and a plurality of blades connected to the outer periphery of the disc.

3. The stirring paddle according to claim 2, characterized in that, The blade includes a connected mounting portion and a stirring portion. The stirring portion is connected to the outer side of the mounting portion along the radial direction of the disk. The blade is fixedly connected to the disk through the mounting portion. The fractal structure is formed in the stirring portion.

4. The stirring paddle according to claim 3, characterized in that, The fractal structure covers the stirring part, and the stirring part and the mounting part satisfy at least one of the following conditions: The length of the mounting part is the same as the length of the stirring part; The thickness of the mounting part is the same as the thickness of the stirring part; The width of the mounting part is 1 / 10 to 1 / 3 times the width of the stirring part.

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