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

Abstract

The utility model 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 field of mixing equipment technology, and in particular to a multi-stage bent axial flow mixing impeller and solid-liquid mixing equipment. Background Technology

[0002] In modern industry, mixing technology plays an irreplaceable role as a key element in achieving efficient production and reactions. The mixing paddle is a crucial component of mixing equipment, providing the energy needed for mixing and maintaining the materials in a suitable flow state, thereby ensuring uniform mixing and good contact between two or more materials. Simultaneously, the mixing paddle enhances mass and heat transfer within the mixing equipment.

[0003] Solid-liquid mixing equipment is an important type of mixing equipment, widely and deeply applied in many industries such as chemical metallurgy, biopharmaceuticals, and food production. In solid-liquid mixing systems, the material mixing efficiency and the suspension state of solid particles within the mixing equipment directly determine the effective contact area and contact efficiency between the solid and liquid phases, and are the main factors affecting interphase mass transfer, heat transfer, and chemical reactions throughout the mixing process.

[0004] CN202087287U provides an axial flow agitator, which consists of impellers, impeller supports, and an agitator hub. The impellers are fixed to the impeller supports by fasteners, and the impeller supports are connected to the agitator hub. The impellers are made of steel plates bent using a special bending process, and the impellers are connected to the impeller support plate by bolts, nuts, and other fasteners. The support plate is at a certain angle to the vertical direction and is directly welded to the agitator hub.

[0005] The blades of the axial flow agitator provided by the above-mentioned utility model, as well as those of traditional axial flow agitators, both include at least a portion of a variable curvature arc surface. The manufacturing process for variable curvature arc surfaces is complex and costly. Furthermore, the difficulty of manufacturing such large-scale blades will be further increased, hindering the expansion of production scale. Simultaneously, when applied to solid-liquid two-phase mixing scenarios, the aforementioned axial flow agitator has insufficient suspending capacity for solid material particles, easily causing solid material particles to accumulate at the bottom of the agitator. Utility Model Content

[0006] This application is made in view of the aforementioned state of the prior art. The purpose of this application is to provide a multi-stage bent axial flow agitator that has a simple manufacturing process, low production cost, and can improve the suspension capacity of solid material particles in solid-liquid two-phase mixing operations.

[0007] This application also provides a solid-liquid mixing device including the above-mentioned multi-section bent axial flow impeller.

[0008] This application provides a multi-stage bent axial flow impeller, which includes 2 to 5 blades and a hub, wherein the blades are evenly arranged along the circumference of the hub.

[0009] The blades include a first blade region, a second blade region, a third blade region, and a fourth blade region connected in sequence.

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

[0011] The first blade region and the second blade region, the second blade region and the third blade region, and the third blade region and the fourth blade region all form an angle greater than 160 degrees and less than 180 degrees.

[0012] The centers of the first blade region, the second blade region, the third blade region, and the fourth blade region successively approach the bottom of the stirring impeller.

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

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

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

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

[0017] In at least one possible implementation, the third blade region connects to the hub.

[0018] The third blade region extends radially along the hub.

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

[0020] The furthest distance from the edge of the first blade region of the axial section of the hub parallel to each of the intersection lines of the blades is 0.1D to 0.36D.

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

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

[0023] In at least one possible implementation, the circumcircle diameter of the stirring paddle is D.

[0024] In a direction perpendicular to each of the intersection lines of the blades, the farthest 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 implementation, the circumcircle diameter of the stirring paddle is D.

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

[0027] In at least one possible implementation, the blades are connected to the hub via one or more connecting parts.

[0028] This application provides a solid-liquid mixing device, comprising: a mixing vessel, a mixing shaft, and a motor; and one or more of the aforementioned multi-section bent axial flow mixing blades.

[0029] The stirring shaft is located inside the stirring vessel, the multi-segment bent axial flow stirring blade is connected to the stirring shaft, and the motor is connected to the stirring shaft.

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

[0031] The interlayer spacing between two adjacent multi-segment bent axial flow impellers is 0.75 to 1.5 times the circumscribed circle diameter of the multi-segment bent axial flow impeller.

[0032] The multi-segment bent axial flow impeller and solid-liquid mixing device provided in this application do not require the installation of variable curvature arc surfaces in the impeller blades, which can effectively reduce the manufacturing difficulty and production cost of the impeller blades. When applied to the mixing of solid and liquid phases, this impeller can effectively enhance the solid-liquid mixing efficiency and the suspension capacity of solid materials. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of a stirring paddle according to one embodiment of this application.

[0035] Figure 2 This is a top view schematic diagram of a stirring impeller according to one embodiment of this application.

[0036] Figure 3 This is a side view schematic diagram of a stirring impeller according to one embodiment of this application.

[0037] Figure 4 This is another structural schematic diagram of a stirring paddle according to one embodiment of this application.

[0038] Figure 5 This is a partial structural schematic diagram of a mixing device according to one embodiment of the present application.

[0039] Figure 6 The simulation diagram shows the flow velocity of the axial flow agitator in the background technology.

[0040] Figure 7 This is a simulation diagram of the flow rate of a stirring impeller according to one embodiment of this application.

[0041] Figure 8 The image shows a simulation of the solid suspension effect in an axial flow agitator in the background technology.

[0042] Figure 9 This is a simulation diagram of the solid suspension effect of a stirring impeller according to one embodiment of this application.

[0043] Explanation of reference numerals in the attached figures

[0044] 10 blades

[0045] 11 First blade region

[0046] 12 Second blade region

[0047] 13 Third blade region

[0048] 14. Fourth blade region

[0049] 20-inch wheels

[0050] 30 Connecting part

[0051] 100 stirring shaft Detailed Implementation

[0052] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0053] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

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

[0055] like Figure 1 and Figure 2 As shown, the impeller 10 may include a first blade region 11, a second blade region 12, a third blade region 13, and a fourth blade region 14 connected in sequence. The first blade region 11, the second blade region 12, the third blade region 13, and the fourth blade region 14 can all be flat, meaning the liquid-facing surface of the impeller does not need to form a variable curvature arc surface (the side edge in the thickness direction of the impeller can form at least a partially curved edge). It is understood that traditional variable curvature arc surface impellers have higher production costs and manufacturing difficulties, while the impeller provided in this application does not require a large area of ​​variable curvature arc surface.

[0056] The first blade region 11 and the second blade region 12, the second blade region 12 and the third blade region 13, and the third blade region 13 and the fourth blade region 14 can all form an angle greater than 160 degrees and less than 180 degrees. In other words, such as Figure 3 As shown, an angle α can be formed between the plane containing the first blade region 11 and the plane containing the second blade region 12, an angle b can be formed between the plane containing the second blade region 12 and the plane containing the third blade region 13, and an angle c can be formed between the plane containing the third blade region 13 and the plane containing the fourth blade region 14. The angles α, b, and c can all be greater than 0 degrees and less than 20 degrees (angles α, b, and c can be considered as supplementary angles between the blade regions), and the bending direction of each of these angles can all point towards the bottom of the impeller. This allows the centers of the second blade region 12, the third blade region 13, and the fourth blade region 14 to successively move away from the center of the first blade region 11 and towards the bottom of the impeller. In other words, the centers of the first blade region 11, the second blade region 12, the third blade region 13, and the fourth blade region 14 gradually decrease in height and approach the bottom of the impeller.

[0057] Furthermore, such as Figure 1 and Figure 2 As shown, the lines of intersection of the first blade region 11 and the second blade region 12, the lines of intersection of the second blade region 12 and the third blade region 13, and the lines of intersection of the third blade region 13 and the fourth blade region 14 can be parallel to each other. For example, the blade 10 can be formed from a single sheet of material (e.g., a solid steel plate) through three bends.

[0058] Furthermore, the outer edges of both the first blade region 11 and the fourth blade region 14 include convex arcuate portions, and the radius of the arcuate portion of the first blade region 11 is smaller than the radius of the arcuate portion of the fourth blade region 14. The radially outer sides of the second blade region 12 and the third blade region 13 may form convex arcuate portions, and the radially inner side of the second blade region 12 may also form concave arcuate portions.

[0059] The radial section of the third blade region 13 relative to the hub 20, perpendicular to the axial direction, can form an angle d. Preferably, the angle d between the radial section of the hub 20 and the third blade region 13 can be between 10 degrees and 60 degrees. The inventors have found that the angles provided above can achieve a better mixing effect for the impeller.

[0060] like Figure 2 and Figure 4 As shown, the third blade region 13 can be connected to the hub 20. Furthermore, the impeller may include multiple connecting portions 30, and the blades 10 can be connected to the hub 20 via one or more connecting portions 30. For example, as... Figure 4 As 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 region 13 can extend radially along the hub 20, that is, the intersection lines of the third blade region 13 with the second blade region 12 and the fourth blade region 14 can be parallel to the radial direction of the hub 20.

[0062] like Figure 2 As shown, the diameter of the circumcircle of the agitator can be D.

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

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

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

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

[0067] Preferably, the diameter of the arc-shaped portion at the outer edge of the first blade region is 0.05D; the diameter of the arc-shaped portion at the outer edge of the fourth blade region is 0.185D.

[0068] It is understood that when the parameters of the multi-segment bent axial flow impeller provided in this embodiment are within the above-mentioned preferred range, the impeller can better promote fluid flow and enhance the mixing effect of solid and liquid phases.

[0069] like Figure 5 As shown, embodiments of this application also provide a solid-liquid mixing device, which may include a mixing vessel, a mixing shaft 100, a motor, and one or more of the aforementioned multi-segment bent axial flow mixing blades. The mixing shaft 100 may be disposed inside the mixing vessel, the mixing blades may be connected to the mixing shaft 100, and the motor may be connected to the mixing shaft 100 to drive the mixing blades to rotate inside the mixing vessel.

[0070] Preferably, multiple multi-segment bent axial flow impellers can be arranged on the stirring shaft. The interlayer spacing between two adjacent multi-segment bent axial flow impellers is 0.75 to 1.5 times the impeller diameter D.

[0071] like Figure 2 and Figure 5 As shown, the multi-segment bent axial flow impeller provided in this application, during operation, has its blades with one end where the first blade region 11 is located as the liquid-facing end, and the lower surface of the blades as the liquid-facing surface. When the impeller rotates, it discharges liquid downwards and enhances the axial circulation intensity of the fluid.

[0072] The following exemplary comparative example illustrates some of the advantages of this implementation.

[0073] like Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the axial flow agitator provided in the utility model CN202087287U mentioned in the background art and the multi-segment bent axial flow agitator provided in this embodiment are subjected to simulated fluid dynamics analysis and solid suspension capability analysis. Figure 6 and Figure 7The analysis results show that both are axially circulating flow patterns. Under the same power consumption, the average liquid velocity of the comparative scheme is 0.07 m / s and the mixing time is 27.7 s, while the average liquid velocity of the technical solution of this application is 0.14 m / s and the mixing time is 17.1 s. Combined with the specific velocity distribution in the figure, it can be seen that the stirring paddle provided in this application has higher liquid flow intensity and axial circulation intensity during operation, providing a stronger solid particle suspension effect and solid-liquid two-phase mixing effect. Figure 8 and Figure 9 The analysis results show that under solid-liquid two-phase stirring conditions, the solid suspension capacity of the comparative scheme is weak, with most solid materials settling at the bottom of the equipment and the solid suspension height being low. However, under the same power consumption, the solid suspension effect of the stirring paddle provided in this application is significantly enhanced, with a significant increase in the suspension height of the solid materials at the bottom. (To better illustrate the solid suspension effect of the stirring equipment, materials with larger solid particle size and density were selected in this analysis, and the stirring paddle speed and power consumption were limited to make the solid-liquid boundary line in the analysis results more obvious. It can be understood that by increasing the speed, increasing power consumption, or selecting materials with lower particle size and density, the technical solution provided in this application can achieve uniform suspension of solid materials.) The inventors also conducted physical comparison tests 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. The conclusions of the physical tests are consistent with the above simulation analysis results.

[0074] It is understood that the multi-stage bent axial flow agitator and solid-liquid mixing equipment provided by the embodiments of this application are particularly suitable for mixing operations of solid and liquid phases, which can effectively improve the suspension ability of solid material particles and improve the mixing efficiency of solid and liquid phases.

[0075] The following is a brief description of some of the beneficial effects of the above-described embodiments of this application.

[0076] The multi-segment bent axial flow impeller and solid-liquid mixing device provided in this application do not require variable curvature arc surfaces in their blades, which can effectively reduce the manufacturing difficulty and production cost of the impeller. When applied to the mixing of solid and liquid phases, this impeller can effectively enhance the solid-liquid mixing efficiency and the suspension capacity of solid materials.

[0077] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

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

[0079] 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 multi-segment bent axial flow impeller, characterized in that, It includes 2 to 5 blades and a hub, with the blades evenly arranged circumferentially along the hub. The blades include a first blade region, a second blade region, a third blade region, and a fourth blade region connected in sequence. The first blade region, the second blade region, the third blade region, and the fourth blade region are all flat. The first blade region and the second blade region, the second blade region and the third blade region, and the third blade region and the fourth blade region all form an angle greater than 160 degrees and less than 180 degrees. The centers of the first blade region, the second blade region, the third blade region, and the fourth blade region successively approach the bottom of the stirring impeller. The lines of intersection between the first blade region and the second blade region, the lines of intersection between the second blade region and the third blade region, and the lines of intersection between the third blade region and the fourth blade region are parallel to each other. The relative angle between the radial section of the hub perpendicular to the axial direction and the third blade region is 10 to 60 degrees.

2. The multi-segment bent axial flow impeller according to claim 1, characterized in that, The outer edges of both the first blade region and the fourth blade region include outwardly convex arc-shaped portions. The radius of the arc-shaped portion of the first blade region is smaller than the radius of the arc-shaped portion of the fourth blade region.

3. The multi-segment bent axial flow impeller according to claim 1, characterized in that, The third blade area connects to the hub. The third blade region extends radially along the hub.

4. The multi-segment bent axial flow impeller according to claim 1, characterized in that, The outer diameter of the stirring paddle is D. The furthest distance from the edge of the first blade region of the axial section of the hub parallel to each of the intersection lines of the blades is 0.1D to 0.36D.

5. The multi-segment bent axial flow impeller according to claim 1, characterized in that, The outer diameter of the stirring paddle is D. In a direction perpendicular to each of the intersection lines of the blades, the width of the third blade region is 0.07D to 0.14D.

6. The multi-segment bent axial flow impeller according to claim 1, characterized in that, The outer diameter of the stirring paddle is D. In a direction perpendicular to each of the intersection lines of the blades, the farthest distance from the edge of the first blade region to the edge of the fourth blade region is 0.2D to 0.55D.

7. The multi-segment bent axial flow impeller according to claim 1, characterized in that, The outer diameter of the stirring paddle is D. The distance between adjacent intersection lines of the blades is 0.08 to 0.16D.

8. The multi-segment bent axial flow impeller according to claim 1, characterized in that, The blades are connected to the hub via one or more connecting parts.

9. A solid-liquid mixing device, characterized in that, include: Mixing vessel, mixing shaft, and motor; as well as One or more of the multi-segment bent axial flow impellers according to any one of claims 1 to 8, The stirring shaft is located inside the stirring vessel, the multi-segment bent axial flow stirring blade is connected to the stirring shaft, and the motor is connected to the stirring shaft.

10. The solid-liquid mixing device according to claim 9, characterized in that, The stirring shaft is equipped with multiple multi-segment bent axial flow stirring blades. The interlayer spacing between two adjacent multi-segment bent axial flow impellers is 0.75 to 1.5 times the circumscribed circle diameter of the multi-segment bent axial flow impeller.

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