Multi-section bending type axial flow stirring paddle and solid-liquid stirring equipment

Abstract

The invention provides a multi-section bending type axial flow stirring paddle and solid-liquid stirring equipment, the multi-section bending type axial flow stirring paddle comprises 2-5 blades and a hub, and the blades are uniformly arranged along the circumferential direction of the hub. The paddle comprises a first blade area, a second blade area, a third blade area and a fourth blade area which are connected in sequence, and the first blade area, the second blade area, the third blade area and the fourth blade area are all in a flat plate shape. Included angles larger than 160 degrees and smaller than 180 degrees are formed between the first blade area and the second blade area, between the second blade area and the third blade area and between the third blade area and the fourth blade area. The center of the first blade area, the center of the second blade area, the center of the third blade area and the center of the fourth blade area are gradually close to the bottom of the stirring paddle. The intersecting line of the first blade area and the second blade area, the intersecting line of the second blade area and the third blade area and the intersecting line of the third blade area and the fourth blade area are parallel to one another.

Description

Technical Field

[0001] This application relates to the technical field of stirring equipment, and particularly to a multi-segment bent axial flow stirring paddle and a solid-liquid stirring equipment. Background Art

[0002] In the contemporary industrial field, the stirring technology, as a key link to achieve efficient production and reaction, plays an irreplaceable role. The stirring paddle is a key component of the stirring equipment. It can provide the energy required for the mixing process to the materials in the stirring equipment through the stirring process and keep the materials in a suitable flow state, so as to make two or more materials mix evenly and contact well. At the same time, the stirring paddle can also enhance the mass transfer and heat transfer effects of the materials in the stirring equipment.

[0003] The solid-liquid stirring equipment is an important type of stirring equipment, which has extensive and in-depth applications in many industries such as chemical metallurgy, biopharmaceuticals, and food production. In the solid-liquid stirring system, the material mixing efficiency and the suspension state of solid particles in the stirring equipment directly determine the effective contact area and contact efficiency of the solid-liquid two-phase materials, and are the main factors affecting the interphase mass transfer, heat transfer, and chemical reactions in the whole stirring process.

[0004] CN202087287U provides an axial flow stirrer, which consists of a paddle blade, a paddle blade support, and a stirring hub. The paddle blade is fixed on the paddle blade support through fasteners, and the paddle blade support is connected to the stirring hub. The paddle blade is bent from a steel plate according to a special bending process. The paddle blade is connected to the paddle blade support plate with fasteners such as bolts and nuts. The support plate forms a certain angle with the vertical direction, and the support plate is directly welded to the stirring hub.

[0005] The blades of the axial flow stirrer provided by the above utility model and the traditional axial flow stirrer both include at least part of a variable curvature arc surface, and the production and processing technology of the variable curvature arc surface is complex and the production cost is relatively high. Moreover, the difficulty of large-scale manufacturing of such blades will be further increased, which is not conducive to expanding the production scale. At the same time, when the above axial flow stirrer is applied to the solid-liquid two-phase mixing operation scenario, its suspension ability for solid material particles is insufficient, and it is easy to cause the solid material particles to accumulate at the bottom of the stirring equipment. Summary of the Invention

[0006] In view of the state of the above-mentioned prior art, this application is made. The purpose of this application is to provide a multi-segment bent axial flow stirring paddle with a simple manufacturing process, low production cost, and capable of improving the suspension ability of solid material particles in the solid-liquid two-phase mixing operation.

[0007] This application also provides a solid-liquid stirring equipment including the above multi-segment bent axial flow stirring paddle.

[0008] The present application provides a multi-segment bent axial flow stirring paddle, which includes 2 to 5 blades and a hub, and the blades are evenly arranged along the circumferential direction of the hub.

[0009] Each blade includes a first blade area, a second blade area, a third blade area, and a fourth blade area that are connected in sequence.

[0010] The first blade area, the second blade area, the third blade area, and the fourth blade area are all flat plates.

[0011] An angle greater than 160 degrees and less than 180 degrees is formed between the first blade area and the second blade area, between the second blade area and the third blade area, and between the third blade area and the fourth blade area.

[0012] The centers of the first blade area, the second blade area, the third blade area, and the fourth blade area gradually approach the bottom of the stirring paddle.

[0013] The intersection line between the first blade area and the second blade area, the intersection line between the second blade area and the third blade area, and the intersection line between the third blade area and the fourth blade area are parallel to each other.

[0014] The relative angle between the radial cross-section of the hub perpendicular to the axial direction and the third blade area is 10 degrees to 60 degrees.

[0015] In at least one possible implementation, the outer edges of the first blade area and the fourth blade area both include outwardly convex arc portions.

[0016] The radius of the arc portion of the first blade area is smaller than the radius of the arc portion of the fourth blade area.

[0017] In at least one possible implementation, the third blade area is connected to the hub.

[0018] The third blade area extends along the radial direction of the hub.

[0019] In at least one possible implementation, the outer diameter of the circumscribed circle of the stirring paddle is D.

[0020] The maximum distance from the axial cross-section of the hub parallel to the intersection lines of the blades to the edge of the first blade area is 0.1D to 0.36D.

[0021] In at least one possible implementation, the outer diameter of the circumscribed circle of the stirring paddle is D.

[0022] In the direction perpendicular to the intersection lines of the blades, the width of the third blade area is 0.07D to 0.14D.

[0023] In at least one possible embodiment, the outer diameter of the circumscribed circle of the stirring paddle is D.

[0024] In the direction perpendicular to each of the intersection lines of the paddle blades, the maximum distance from the edge of the first blade region to the edge of the fourth blade region is 0.2D to 0.55D.

[0025] In at least one possible embodiment, the outer diameter of the circumscribed circle of the stirring paddle is D.

[0026] The distance between adjacent intersection lines of the paddle blades is 0.08 to 0.16D.

[0027] In at least one possible embodiment, the paddle blade is connected to the hub via one or more connecting parts.

[0028] The present application provides a solid-liquid stirring device, which includes: a stirring kettle, a stirring shaft and a motor; and one or more of the aforementioned multi-segment bent axial-flow stirring paddles.

[0029] The stirring shaft is arranged inside the stirring kettle, the multi-segment bent axial-flow stirring paddle is connected to the stirring shaft, and the motor is connected to the stirring shaft.

[0030] In at least one possible embodiment, the stirring shaft is provided with a plurality of the multi-segment bent axial-flow stirring paddles.

[0031] The layer spacing between two adjacent multi-segment bent axial-flow stirring paddles is 0.75 to 1.5 times the outer diameter of the circumscribed circle of the multi-segment bent axial-flow stirring paddle.

[0032] In the paddle blades of the multi-segment bent axial-flow stirring paddle and the solid-liquid stirring device provided by the present application, there is no need to set a variable curvature arc surface, which can effectively reduce the process difficulty and production cost of the paddle blades. When the paddle blades are applied to the stirring of solid-liquid two phases, the solid-liquid mixing efficiency and the suspension ability of solid materials can be effectively enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a schematic structural diagram of a stirring paddle according to an embodiment of the present application.

[0035] Figure 2 It is a top view schematic diagram of a stirring paddle according to an embodiment of the present application.

[0036] Figure 3 Side view schematic diagram of the stirring paddle according to an embodiment of the present application.

[0037] Figure 4 Another structural schematic diagram of the stirring paddle according to an embodiment of the present application.

[0038] Figure 5 Partial structural schematic diagram of the stirring equipment according to an embodiment of the present application.

[0039] Figure 6 Flow velocity simulation diagram of the axial flow agitator in the background art.

[0040] Figure 7 Flow velocity simulation diagram of the stirring paddle according to an embodiment of the present application.

[0041] Figure 8 Solid suspension effect simulation diagram of the axial flow agitator in the background art.

[0042] Figure 9 Solid suspension effect simulation diagram of the stirring paddle according to an embodiment of the present application.

[0043] Description of reference numerals

[0044] 10 Blade

[0045] 11 First blade area

[0046] 12 Second blade area

[0047] 13 Third blade area

[0048] 14 Fourth blade area

[0049] 20 Hub

[0050] 30 Connecting part

[0051] 100 Stirring shaft Detailed implementation manners

[0052] The exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, rather than to exhaust all possible ways of the present application, nor to limit the scope of the present application.

[0053] In the description of the present application, unless otherwise clearly specified and defined, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0054] As Figure 1 shown, an embodiment of the present application provides a multi-segment bent axial flow stirring paddle (hereinafter, sometimes simply referred to as "stirring paddle"), and the stirring paddle may include a plurality of paddle blades 10 and a hub 20. Further, the stirring paddle may include 2 to 5 paddle blades 10 (exemplarily, the stirring paddle in this embodiment may include three paddle blades 10, but not limited thereto), and the plurality of paddle blades 10 may be evenly arranged along the circumferential direction of the hub 20.

[0055] As Figure 1 and Figure 2 shown, the paddle blade 10 may include a first blade area 11, a second blade area 12, a third blade area 13, and a fourth blade area 14 that are connected in sequence. The first blade area 11, the second blade area 12, the third blade area 13, and the fourth blade area 14 may all be flat plates, that is, the liquid-facing surface of the paddle blade does not need to form a variable curvature arc surface (at least part of the arc edge may be formed on the side of the paddle blade in the thickness direction). It can be understood that the production cost and manufacturing difficulty of traditional variable curvature arc surface stirring paddles are relatively large, while the stirring paddle provided by the present application does not require a large area of variable curvature arc surface.

[0056] An angle greater than 160 degrees and less than 180 degrees may be formed between the first blade area 11 and the second blade area 12, between the second blade area 12 and the third blade area 13, and between the third blade area 13 and the fourth blade area 14. In other words, as Figure 3 shown, an angle a may be formed between the plane where the first blade area 11 is located and the plane where the second blade area 12 is located, an angle b may be formed between the plane where the second blade area 12 is located and the plane where the third blade area 13 is located, and an angle c may be formed between the plane where the third blade area 13 is located and the plane where the fourth blade area 14 is located. The angles of the angles a, b, and c may all be greater than 0 degrees and less than 20 degrees (the angles a, b, c can be regarded as the supplementary angles of the above-mentioned blade area angles), and the bending directions of the above-mentioned angles may all face the bottom of the stirring paddle. So that the centers of the second blade area 12, the third blade area 13, and the fourth blade area 14 can be sequentially away from the center of the first blade area 11 towards the bottom of the stirring paddle. In other words, the centers of the first blade area 11, the second blade area 12, the third blade area 13, and the fourth blade area 14 gradually decrease and approach the bottom of the stirring paddle.

[0057] Furthermore, as Figure 1 and Figure 2 shown, the intersection lines between the first blade area 11 and the second blade area 12, between the second blade area 12 and the third blade area 13, and between the third blade area 13 and the fourth blade area 14 can be parallel to each other. Exemplarily, the blade 10 can be formed by bending a single sheet of material (such as a solid steel plate) three times.

[0058] Furthermore, the outer edges of both the first blade area 11 and the fourth blade area 14 include outwardly convex arc portions, and the radius of the arc portion of the first blade area 11 is smaller than the radius of the arc portion of the fourth blade area 14. An outwardly convex arc portion can be formed on the radially outer side of the second blade area 12 and the third blade area 13, and an inwardly concave arc portion can also be formed on the radially inner side of the second blade area 12.

[0059] The radially cross-section of the third blade area 13 perpendicular to the axial direction relative to the hub 20 can form an included angle d. Preferably, the included angle d between the radially cross-section of the hub 20 and the third blade area 13 can be 10 degrees to 60 degrees. The inventor found that the angles of the above-provided included angles can make the mixing and stirring effect of the stirring paddle at a better level.

[0060] As Figure 2 and Figure 4 shown, the third blade area 13 can be connected to the hub 20. Furthermore, the stirring paddle can include a plurality of connecting parts 30, and the blade 10 can be connected to the hub 20 via one or more connecting parts 30. Exemplarily, as Figure 4 shown, the blade 10 can be connected to the hub 20 via a connecting part 30 provided on the blade 10. The connecting part 30 can be bolted, welded, or riveted to the blade 10.

[0061] Preferably, the third blade area 13 can extend along the radial direction of the hub 20, that is, the intersection lines of the third blade area 13 with the second blade area 12 and the fourth blade area 14 respectively can be parallel to the radial direction of the hub 20.

[0062] As Figure 2 shown, the diameter of the circumscribed circle of the stirring paddle can be D.

[0063] Preferably, in the direction perpendicular to the intersection lines of the blades, the width w of the third blade area 13 can be 0.07D to 0.14D. More preferably, the above width w can be 0.11D.

[0064] Preferably, the maximum distance L1 from the axial cross-section of the hub 20 parallel to the intersection lines of the blades to the edge of the first blade area 11 can be 0.1D to 0.36D. More preferably, the above distance L1 can be 0.2D.

[0065] Preferably, in the direction perpendicular to the intersection lines of the blade, the maximum distance L2 from the edge of the first blade area 11 to the edge of the fourth blade area 14 may be 0.2D to 0.55D. More preferably, the distance L2 may be 0.36D.

[0066] Preferably, the distance between adjacent intersection lines of the blade may be 0.08 to 0.16D.

[0067] Preferably, the diameter corresponding to the arc portion of the outer edge of the first blade area is 0.05D; the diameter corresponding to the arc portion of the outer edge of the fourth blade area is 0.185D.

[0068] It can be understood that when the parameters of the multi-segment bent axial flow stirring paddle provided in this embodiment are within the above preferred ranges, the stirring paddle can better promote fluid flow and enhance the mixing effect of the solid-liquid two-phase.

[0069] As Figure 5 shown, an embodiment of the present application further provides a solid-liquid stirring device, which may include a stirring kettle, a stirring shaft 100, a motor, and one or more of the aforementioned multi-segment bent axial flow stirring paddles. The stirring shaft 100 may be disposed inside the stirring kettle, the stirring paddle may be connected to the stirring shaft 100, and the motor may be connected to the stirring shaft 100 to drive the stirring paddle to rotate inside the stirring kettle.

[0070] Preferably, multiple multi-segment bent axial flow stirring paddles may be disposed on the stirring shaft. The layer spacing between two adjacent multi-segment bent axial flow stirring paddles is 0.75 to 1.5 times the diameter D of the stirring paddle.

[0071] As Figure 2 and Figure 5 shown, when the multi-segment bent axial flow stirring paddle provided in the embodiment of the present application is working, one end of the blade where the first blade area 11 is provided is the liquid-facing end, and the lower surface of the blade is the liquid-facing surface. When the stirring paddle rotates, it will drain the liquid downward and enhance the axial circulation intensity of the fluid.

[0072] The following gives an exemplary comparative example to illustrate some advantages of this embodiment.

[0073] As Figure 6 、 Figure 7 、 Figure 8 and Figure 9 shown, a simulation of fluid dynamics analysis and solid suspension capacity analysis is performed on the axial flow stirrer provided in the utility model CN202087287U mentioned in the background art and the multi-segment bent axial flow stirring paddle provided in this embodiment. Figure 6 and Figure 7The analysis results show that both are flow patterns of overall axial circulation. At the same power consumption, the average liquid flow velocity of the comparative scheme is 0.07 m / s (meters per second), and the stirring and mixing time is 27.7 s (seconds), while the average liquid flow velocity of the technical solution of the present application is 0.14 m / s, and the stirring and mixing time is 17.1 s. Combining the specific flow velocity distribution in the figure, it can be seen that the liquid flow intensity and axial circulation intensity during the operation of the stirring paddle provided by the present application are higher, and can provide a stronger solid material particle suspension effect and solid-liquid two-phase mixing effect. Figure 8 and Figure 9 The analysis results show that under the condition of solid-liquid two-phase stirring, the solid suspension ability of the comparative scheme is weak, most of the solid materials sink to the bottom of the equipment, and the solid suspension height is low. While at the same power consumption, the solid suspension effect during the operation of the stirring paddle provided by the present application is significantly enhanced, and the suspension height of the solid materials at the bottom is significantly increased. (In order to better visually compare and illustrate the solid suspension effect of the stirring equipment, materials with larger solid particle size and density were selected in this analysis, and the rotation speed and power consumption of the stirring paddle were limited to make the solid-liquid demarcation line in the analysis results more obvious. It can be understood that when increasing the rotation speed, increasing the power consumption or selecting materials with lower particle size and density, the technical solution provided by the present application can achieve uniform suspension of solid materials.) The inventor also conducted a physical comparison test on the axial flow stirrer provided in the above-mentioned utility model CN202087287U and the multi-segment bent axial flow stirring paddle provided in this embodiment, and the conclusion of the physical test is consistent with the above simulation analysis results.

[0074] It can be understood that the multi-segment bent axial flow stirring paddle and the solid-liquid stirring equipment provided by the embodiments of the present application are particularly suitable for solid-liquid two-phase stirring operations, and can effectively improve the suspension ability of solid material particles and the mixing efficiency of solid-liquid two phases.

[0075] The following briefly describes some beneficial effects of the above embodiments of the present application.

[0076] The multi-segment bent axial flow stirring paddle and the solid-liquid stirring equipment provided by the embodiments of the present application do not need to be provided with variable curvature arc surfaces on the blades, which can effectively reduce the process difficulty and production cost of the blades. When the blades are applied to solid-liquid two-phase stirring, the solid-liquid mixing efficiency and the suspension ability of solid materials can be effectively enhanced.

[0077] It can be understood that in the present application, when the number of components or members is not specifically limited, the number can be one or more, and here multiple means two or more. For the case where the number of components or members shown in the drawings and / or described in the specification is a specific number such as two, three, four, etc., this specific number is usually exemplary rather than restrictive, and it can be understood as multiple, that is, two or more, however, this does not mean that the present application excludes the case of one.

[0078] It should be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0079] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A multi-segment bending axial flow stirring paddle, characterized in that, It includes 2 to 5 blades (10) and a hub (20), and the blades (10) are evenly arranged circumferentially along the hub (20). The blade (10) includes a first blade area (11), a second blade area (12), a third blade area (13) and a fourth blade area (14) connected in sequence. The first blade area (11), the second blade area (12), the third blade area (13) and the fourth blade area (14) are all flat plates. An angle greater than 160 degrees and less than 180 degrees is formed between the first blade area (11) and the second blade area (12), between the second blade area (12) and the third blade area (13), and between the third blade area (13) and the fourth blade area (14). The centers of the first blade area (11), the second blade area (12), the third blade area (13) and the fourth blade area (14) gradually approach the bottom of the stirring paddle. The intersection lines between the first blade area (11) and the second blade area (12), between the second blade area (12) and the third blade area (13), and between the third blade area (13) and the fourth blade area (14) are parallel to each other. The relative angle between the radial cross-section perpendicular to the axial direction of the hub (20) and the third blade area (13) is 10 degrees to 60 degrees.

2. The multi-segment bent axial flow stirring paddle according to claim 1, wherein The outer edges of the first blade area (11) and the fourth blade area (14) both include outwardly convex arc portions. The radius of the arc portion of the first blade area (11) is smaller than the radius of the arc portion of the fourth blade area (14).

3. The multi-segment bent axial-flow stirring paddle according to claim 1, wherein The third blade area (13) is connected to the hub (20). The third blade area (13) extends radially along the hub (20).

4. The multi-segment bent axial-flow stirring paddle according to claim 1, wherein The outer diameter of the circumscribed circle of the stirring paddle is D. The maximum distance from the edge of the first blade area (11) to the axial cross-section parallel to the intersection lines of the blades (10) of the hub (20) is 0.1D to 0.36D.

5. The multi-segment bent axial-flow stirring paddle according to claim 1, wherein The outer diameter of the circumscribed circle of the stirring paddle is D. In the direction perpendicular to the intersection lines of the blades (10), the width of the third blade area (13) is 0.07D to 0.14D.

6. The multi-segment bent axial-flow stirring paddle according to claim 1, wherein The outer diameter of the circumscribed circle of the stirring paddle is D. In the direction perpendicular to the intersection lines of the blades (10), the maximum distance from the edge of the first blade area (11) to the edge of the fourth blade area (14) is 0.2D to 0.55D.

7. The multi-segment bent axial-flow stirring paddle according to claim 1, wherein The outer diameter of the circumscribed circle of the stirring paddle is D. The distance between adjacent intersection lines of the blades (10) is 0.08 to 0.16D.

8. The multi-segment bending axial flow stirring paddle according to claim 1, wherein The blade (10) is connected to the hub (20) via one or more connecting parts (30).

9. A solid-liquid stirring device, characterized in that, Comprising: A stirring kettle, a stirring shaft (100) and a motor; And One or more multi-segment bent axial flow stirring paddles according to any one of claims 1 to 8, The stirring shaft (100) is arranged inside the stirring kettle, the multi-segment bent axial flow stirring paddle is connected to the stirring shaft (100), and the motor is connected to the stirring shaft (100).

10. The solid-liquid stirring device according to claim 9, characterized in that, The stirring shaft (100) is provided with a plurality of the multi-segment bent axial flow stirring paddles, The layer spacing between two adjacent multi-segment bent axial flow stirring paddles is 0.75 to 1.5 times the outer diameter of the circumcircle of the multi-segment bent axial flow stirring paddle.

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