JP7563753B2 - Agitation component and agitation blade equipped with the same - Google Patents

Description

The present invention relates to an agitation component and an agitation blade equipped with the same, and more specifically, to an agitation component that is attached to a rotating shaft along the axial direction to form an agitation blade, and an agitation blade equipped with the same.

Mixing high-viscosity fluids is difficult because it creates a laminar flow field. In addition, large mixing blades are required, which requires high torque and mechanical strength, and inevitably leads to high costs. Furthermore, anchor blades, which have a simple geometric shape and wall scraping effect, are often used, but they generate many doughnut-ring-shaped unmixed areas, so their mixing ability is significantly inferior to that of helical ribbon blades, etc. On the other hand, large two-paddle blades can be used over a wide range of Reynolds numbers, but when Re is < 50, their performance is slightly lower than that of helical ribbon blades, and for fluids with yield stress, their mixing performance near the wall is low. In recent years, it has been found that Satake Chemical Machinery Co., Ltd.'s product name Supermix LR500 (see, for example, Patent Documents 1 and 2) has better mixing performance than helical ribbon blades and can also handle changes in the liquid level. Furthermore, it has been found that the presence or absence of a central axis affects mixing performance.

Japanese Patent Application Publication No. 8-187424 JP 2016-83592 A

Here, it is common to select an impeller type (e.g., anchor impeller, paddle impeller, helical ribbon impeller, etc.) that provides good mixing performance according to the viscosity of the fluid and the type of mixing (e.g., solid-liquid mixing, near-phase mixing, etc.) by analogy based on experience and track record. However, if different impeller types are used depending on the viscosity of the fluid and the type of mixing, the impellers themselves are expensive, including the development costs.

The present invention was made in consideration of the above-mentioned current situation, and aims to provide an agitation component and an agitation blade equipped with the same that can easily configure various variations of agitation blades that exhibit good mixing performance depending on the viscosity of the fluid and the type of agitation while reducing costs.

The inventors focused on reducing costs as a new perspective in the development of impellers, and attempted to develop impellers with simple geometric shapes that are easy to manufacture. Therefore, they considered combining simple parts to eliminate as much of the curved surfaces that many impellers for high viscosity fluids have as geometric shapes. However, simply making the paddle impellers multi-staged is not a good idea because it creates many donut-ring-shaped unmixed regions. Therefore, they discovered that by combining multiple impellers with variable paddle inclination angles, and deforming the impellers (changing the inclination angle of the paddle parts) and combining them (making the impellers multi-staged), it is possible to evolve impellers into various variations that exhibit good mixing performance depending on the viscosity of the fluid and the type of mixing, and thus completed the present invention.

The present invention is as follows.
1. A stirring component comprising a plurality of stirring blades attached to a rotating shaft along the axial direction, the stirring component comprising a boss attached to the rotating shaft so as to be movable in the axial direction and rotatable about the axis, a shaft portion attached to the boss and extending to the side of the boss, and a paddle body having a paddle portion attached to one end of the shaft portion, the stirring component being characterized in that the inclination angle of the paddle portion with respect to a plane perpendicular to the axis of the rotating shaft is adjustable.
2. The stirring part according to the above item 1, wherein a plurality of the paddle bodies are provided around the rotation shaft.
3. The stirring part according to the above item 1 or 2, wherein the shaft portion is attached to the boss so as to be rotatable about its axis.
4. The stirring part according to any one of 1. to 3. above, wherein the shaft portion is attached to the boss so as to be movable in the axial direction.
5. The agitating part according to any one of 1 to 4 above, wherein when the plurality of agitating parts are attached to the rotating shaft, by adjusting an attachment position of the boss with respect to the rotating shaft and an inclination angle of the paddle part, it is possible to selectively configure a first arrangement form in which the paddle parts of the plurality of agitating parts are arranged along the axial direction of the rotating shaft, and a second arrangement form in which the paddle parts of the plurality of agitating parts are arranged in a spiral shape centered on the axis of the rotating shaft.
6. An agitating impeller comprising: a rotating shaft; and a plurality of agitating parts according to any one of 1. to 5. above attached to the rotating shaft along the axial direction.

The agitator part of the present invention includes a boss that is attached to the rotating shaft so as to be movable in the axial direction and rotatable about the shaft, a shaft portion that is attached to the boss and extends to the side of the boss, and a paddle body having a paddle portion attached to one end of the shaft portion, and the inclination angle of the paddle portion with respect to a plane perpendicular to the axis of the rotating shaft is adjustable. As a result, when attaching multiple agitator parts to the rotating shaft, by adjusting the attachment position of the boss with respect to the rotating shaft and the inclination angle of the paddle portion, it is possible to easily configure a variety of agitator blades that exhibit good mixing performance according to the viscosity of the fluid, the type of agitation, etc.
Furthermore, when a plurality of paddle bodies are provided around the rotation shaft, a wider variety of stirring blades can be configured.
Furthermore, when the shaft portion is attached to the boss so as to be rotatable about its axis, the inclination angle of the paddle portion is adjusted by rotating the shaft portion about its axis relative to the boss.
Furthermore, when the shaft portion is attached to the boss so as to be movable in the axial direction, the outer diameter dimension of the paddle body is adjusted by moving the shaft portion in the axial direction relative to the boss.
Furthermore, when multiple stirring parts are attached to the rotating shaft, if it is possible to selectively configure the first arrangement form and the second arrangement form by adjusting the mounting position of the boss relative to the rotating shaft and the inclination angle of the paddle part, the first arrangement form or the second arrangement form can be appropriately selected and configured depending on the viscosity of the fluid, the stirring form, etc.

The agitator blade of the present invention comprises a rotating shaft and the above-mentioned agitator parts attached to the rotating shaft in the axial direction. As a result, when attaching multiple agitator parts to the rotating shaft, by adjusting the mounting position of the boss relative to the rotating shaft and the inclination angle of the paddle part, it is possible to easily configure a variety of agitator blades that exhibit good mixing performance according to the viscosity of the fluid, the type of agitation, etc.

The present invention will be further described in the following detailed description by way of non-limiting examples of exemplary embodiments according to the invention and with reference to the several drawings mentioned, in which like reference numerals refer to like parts throughout the several views of the drawings.
1A and 1B are perspective views of an agitator part according to an embodiment of the present invention, in which FIG. 5A and 5B are explanatory diagrams for explaining a boss constituting an agitating part, in which (a) shows a perspective view and (b) shows a cross-sectional view taken along line bb. 5A and 5B are explanatory diagrams for explaining a paddle body constituting the stirring part, in which FIG. 5A shows a plan view and FIG. 5B shows a view taken along the arrow b. 5A and 5B are diagrams for explaining the operation of the stirring part, in which FIG. 5A shows a view from the axial direction of the rotating shaft, and FIG. 5B shows a view in the direction of arrow b. FIG. 2 is a perspective view of an agitating blade according to an embodiment. FIG. 11 is a perspective view of an agitating blade according to another embodiment. FIG. 11 is a perspective view of an agitating blade according to still another embodiment. FIG. 11 is a perspective view of an agitating blade according to still another embodiment. FIG. 1 is an explanatory diagram for explaining a solid-liquid mixing performance test using an impeller according to an experimental example, where (a) shows the experimental results using a multi-stage inclined paddle type impeller (inclination angle: 60 degrees), (b) shows the experimental results using a multi-stage inclined paddle type impeller (inclination angle: 45 degrees), (c) shows the experimental results using a multi-stage inclined paddle type impeller (inclination angle: 30 degrees), and (d) shows the experimental results using a helical ribbon style impeller. 1A and 1B are explanatory diagrams for explaining a solid-liquid mixing performance test using an impeller according to a comparative example, in which (a) shows the experimental results using LR500 (existing impeller), and (b) shows the experimental results using a shaft-less helical ribbon impeller (existing impeller). FIG. 1 is an explanatory diagram for explaining a near-phase stirring performance test using an impeller according to an experimental example, where (a) shows the experimental results using a multi-stage inclined paddle type impeller (inclination angle: 30 degrees), (b) shows the experimental results using a multi-stage inclined paddle type impeller (inclination angle: 45 degrees), (c) shows the experimental results using a multi-stage inclined paddle type impeller (inclination angle: 60 degrees), and (d) shows the experimental results using a helical ribbon style impeller. FIG. 1 is an explanatory diagram for explaining a near-phase stirring performance test using a stirring impeller according to a comparative example, where (a) shows the experimental results using LR500 (existing impeller), and (b) shows the experimental results using a shaft-less helical ribbon impeller (existing impeller). FIG. 11 is a perspective view of an agitating part according to another embodiment. FIG. 11 is a perspective view of an agitating blade according to another embodiment.

The matters set forth herein are illustrative and are intended to provide an illustrative description of the embodiments of the present invention, with the objective of providing what is believed to be the most effective and easily understood explanation of the principles and conceptual features of the present invention. In this regard, it is not intended to provide structural details of the present invention beyond the extent necessary for a fundamental understanding of the present invention, and the description, taken together with the drawings, will make clear to those skilled in the art how some forms of the present invention may be embodied in practice.

<Mixing parts>
The stirring part according to the present embodiment is, for example, a stirring part 1 that is attached to a rotating shaft 2 along the axial direction to form stirring blades 3A to 3D, as shown in Figures 5 to 8. As shown in Figures 1 to 3, the stirring part 1 includes a boss 5 that is attached to the rotating shaft 2 so as to be movable in the axial direction and rotatable about the axis, a shaft portion 6 that is attached to the boss 5 and extends to the side of the boss 5, and a paddle body 8 that has a paddle portion 7 attached to one end of the shaft portion 6. As shown in Figure 4, for example, the inclination angle θ of the paddle portion 7 with respect to a plane P that is perpendicular to the axis of the rotating shaft 2 is adjustable.

The material, shape, size, etc. of the boss 5 are not particularly important. The boss 5 may be constructed by assembling multiple divided parts, but is preferably constructed as a single part from the viewpoint of reducing the number of parts. Furthermore, the manner in which the boss 5 is attached to the rotating shaft 2 is not particularly important. For example, as shown in FIG. 1, the boss 5 is formed with an insertion hole 11 through which the rotating shaft 2 is inserted, and a screw hole 12 whose one end opens on the surface of the boss 5 and whose other end is connected to the insertion hole 11, and the tip of the screw 13 screwed into the screw hole 12 presses against the outer circumferential surface of the rotating shaft 2 inserted into the insertion hole 11, thereby attaching the boss 5 to the rotating shaft 3.

The material, shape, size, etc. of the paddle body 8 are not particularly important. For example, only one paddle body 8 may be provided, but from the viewpoint of the diversity of stirring blades, etc., it is preferable that multiple paddle bodies 8 (especially 2 to 5) are provided around the axis of the rotating shaft 2. In particular, from the viewpoint of stirring performance, etc., it is preferable that multiple paddle bodies 8 are arranged at equal angular intervals around the axis of the rotating shaft 2.

The material, shape, size, etc. of the shaft 6 constituting the paddle body 8 are not particularly limited and are appropriately selected depending on the stirring form, etc. The shaft 6 may be made of metal, such as iron, stainless steel, or Hastelloy, or may be made of synthetic resin, such as polyolefin resin, such as polypropylene, epoxy resin, fluororesin, or PEEK resin. Examples of the shape of the shaft 6 include linear, curved, bent, and curved. Furthermore, the shaft 6 may be, for example, solid or hollow.
The material, shape, size, etc. of the paddle portion 7 constituting the paddle body 8 are not particularly limited and are appropriately selected depending on the stirring form, etc. The paddle portion 6 may be made of metal such as iron, stainless steel, Hastelloy, etc., or may be made of synthetic resin such as polyolefin resin such as polypropylene, epoxy resin, fluororesin, PEEK resin, etc. Furthermore, the shape of the paddle portion 7 may be, for example, a flat plate shape, a bent plate shape, a curved plate shape, etc.
The paddle body 8 may be, for example, a single piece formed by welding, adhering, bonding, screwing, fitting, or the like of the shaft portion 6 and the paddle portion 7, which are separate parts, or may be a single piece molded product (including an insert molded product) formed by casting, injection molding, or the like.
The shaft portion 6 constituting the paddle body 8 is attached to the boss 5 so as to be rotatable about its axis, for example, and the inclination angle θ of the paddle portion 7 can be adjusted by rotating the shaft portion 6 about its axis relative to the boss 5 (see FIG. 4 ). Furthermore, the shaft portion 6 is attached to the boss 5 so as to be movable in its axial direction, for example, and the outer diameter dimension D of the paddle body 8 can be adjusted by moving the shaft portion 6 in the axial direction relative to the boss 5.
In the above embodiment, for example, as shown in FIG. 1 , the boss 5 is formed with an insertion hole 15 into which the shaft portion 6 is inserted, and a screw hole 16 having one end opening into the surface of the boss 5 and the other end connected to the insertion hole 15, and the paddle body 8 can be attached to the boss 5 by pressing the outer peripheral surface of the shaft portion 6 inserted into the insertion hole 15 with the tip of a screw 17 screwed into the screw hole 16.

The stirring part 1 in this embodiment can be selectively configured, for example, by adjusting the mounting position of the boss 5 relative to the rotating shaft 2 and the inclination angle θ of the paddle part 7, when attaching multiple stirring parts 1 to the rotating shaft 2, between a first arrangement form A1 (see Figures 5 and 6) in which the paddle parts 7 of the multiple stirring parts 1 are arranged along the axial direction of the rotating shaft 2, and a second arrangement form A2 (see Figures 7 and 8) in which the paddle parts 7 of the multiple stirring parts 1 are arranged in a spiral shape centered on the axis of the rotating shaft 2.
When the first arrangement form A1 is selected, for example, it is possible to selectively configure a multi-stage inclined paddle type agitator blade 3A (see Figure 5) in which the inclination angle θ of the paddle portion 7 is an acute angle, and an anchor-style paddle blade 3B (see Figure 6) in which the inclination angle θ of the paddle portion 7 is a right angle.
When the second arrangement form A2 is selected, it is possible to selectively configure, for example, a helical ribbon-style agitator blade 3C (see Figure 7) in which the paddle portions 7 of multiple agitator parts 1 are arranged in a continuous spiral, and a helical ribbon cut-out-style agitator blade 3D (see Figure 8) in which the paddle portions 7 of multiple agitator parts 1 are arranged in an intermittent spiral.
Here, examples of the stirring forms include liquid-liquid stirring of homogeneous liquid systems for the purposes of uniform temperature, uniform concentration, distillation/evaporation, prevention of separation, prevention of film formation, etc., liquid-liquid stirring of heterogeneous liquid systems (mutually soluble) for the purposes of mixing/blending, dissolving, diluting, reaction, etc., liquid-liquid stirring of heterogeneous liquid systems (mutually insoluble) for the purposes of dispersion, emulsification, cleaning, extraction, reaction, etc., liquid-solid stirring for the purposes of dissolving, dispersing, preventing floating, preventing sedimentation, cleaning, extraction, crushing, etc., and liquid-gas stirring for the purposes of absorption reaction, dispersion (aeration, degassing, deodorization, flotation, etc.), reaction (oxidation, sulfurization, etc.), fermentation, etc. In such various stirring forms, the viscosity of the stirred liquid also varies, but by combining multiple stirring parts 1, an infinite variety of stirring blades suitable for the stirring form and the viscosity of the stirred liquid can be easily configured.

<Mixing blade>
5 to 8, the stirring blades 3A to 3D according to the present embodiment include a rotating shaft 2 and a plurality of stirring parts 1 according to the above-described embodiment attached along the axial direction of the rotating shaft 2. The number of attached stirring parts 1 and the interval between adjacent stirring parts 1 are not particularly important.
The stirring blades 3A to 3D are usually disposed in a stirring vessel 19 when in use.
The rotating shaft 2 can be rotated in one direction or both directions by, for example, a driving unit such as a motor. Furthermore, the rotating shaft 2 may be disposed, for example, along the center of the stirring tank 19, parallel to the center of the stirring tank 19, or inclined with respect to the center of the stirring tank 19.

The reference symbols for each component described in the above embodiment indicate the corresponding relationship with the specific components described in the examples described below.

The present invention will be specifically explained below using examples and drawings.

The stirring part 1 according to this embodiment is attached to a rotating shaft 2 along the axial direction to form stirring blades 3A to 3D (see Figs. 5 to 8). As shown in Fig. 1, this stirring part 1 includes a boss 5 attached to the rotating shaft 2 so as to be movable in the axial direction and rotatable about the axis, a shaft portion 6 attached to the boss 5 and extending to the side of the boss 5, and a paddle body 8 having a paddle portion 7 attached to one end of the shaft portion 6.
The rotating shaft 2 is rotated by a driving motor (not shown).

The boss 5 is made of metal and formed into a cylindrical shape. As shown in Figs. 1 and 2, the boss 5 has an insertion hole 11 through which the rotating shaft 2 is inserted, and a screw hole 12 whose one end opens on the outer circumferential surface of the boss 5 and whose other end is connected to the insertion hole 11. The boss 5 is attached to the rotating shaft 2 by pressing the outer circumferential surface of the rotating shaft 2 inserted into the insertion hole 11 with the tip of a screw (set screw) 13 screwed into the screw hole 12. Furthermore, the boss 5 has an insertion hole 15 through which the shaft portion 6 of the paddle body 8 is inserted, and a screw hole 16 whose one end opens on the outer circumferential surface of the boss 5 and whose other end is connected to the insertion hole 15. The paddle body 8 is attached to the boss 5 by pressing the outer circumferential surface of the shaft portion 6 inserted into the insertion hole 15 with the tip of a screw (set screw) 17 screwed into the screw hole 16.

As shown in Figs. 1 and 3, the shaft portion 6 constituting the paddle body 8 is made of metal and formed into a rod shape. This shaft portion 6 is inserted into the insertion hole 15 of the boss 5 and is attached so as to be rotatable around its axis. Furthermore, the paddle portion 7 constituting the paddle body 8 is made of metal and formed into a plate shape. This paddle portion 7 is fixed to one end side of the shaft portion 6 by welding or the like. Furthermore, multiple paddle bodies 8 (two in the figure) are provided at equal angular intervals (180 degrees in the figure) around the axis of the rotating shaft 2 for one boss 5.

As shown in FIG. 4, the mounting position of the boss 5 relative to the rotating shaft 2 (specifically, the mounting position of the boss 5 around the axis and in the axial direction of the rotating shaft 2) can be adjusted by rotating the boss 5 around the axis and moving it axially relative to the rotating shaft 2. In addition, the inclination angle θ of the paddle portion 7 relative to a plane P (specifically, a horizontal plane) perpendicular to the axis C of the rotating shaft 2 can be adjusted by rotating the shaft portion 6 around the axis relative to the boss 5. Furthermore, the outer diameter D (see FIG. 1) of the paddle body 8 can be adjusted by moving the shaft portion 6 in the axial direction relative to the boss 5.

Next, we will explain the agitating blades 3A to 3D that are configured using the agitating part 1 configured as described above. As shown in Figures 5 to 8, these agitating blades 3A to 3D include a rotating shaft 2 and a plurality of agitating parts 1 that are attached to the rotating shaft 2 along the axial direction. One of these agitating blades 3A to 3D can be selected and configured by adjusting the attachment position of the boss 5 relative to the rotating shaft 2 and the inclination angle θ of the paddle portion 7.
The stirring blades 3A to 3D are disposed in a stirring tank 19 into which a fluid (substance to be stirred) is placed.

The agitator blade 3A is a multi-stage inclined paddle type agitator blade 3A that forms a first arrangement form A1 in which the paddle portions 7 of the multiple agitator parts 1 are arranged along the axial direction of the rotating shaft 2 (see FIG. 5). In this agitator blade 3A, the inclination angle θ of the paddle portions 7 is an acute angle. In addition, the agitator blade 3B is an anchor-style agitator blade 3B that forms a first arrangement form A1 in which the paddle portions 7 of the multiple agitator parts 1 are arranged along the axial direction of the rotating shaft 2 (see FIG. 6). In this agitator blade 3B, the inclination angle θ of the paddle portions 7 is a right angle. Furthermore, the edges of the paddle portions 7 of the vertically adjacent agitator parts 1 are arranged close to each other with almost no gaps.

The agitator 3C is a helical ribbon-like agitator 3C having a second arrangement form A2 in which the paddle parts of multiple agitator parts are arranged in a continuous spiral shape centered on the axis of the rotating shaft (see FIG. 7). In this agitator 3C, the edges of the paddle parts 7 of the agitator parts 1 adjacent vertically are arranged close to each other with almost no gaps. The agitator 3D is a helical ribbon-cut agitator 3D having a second arrangement form A2 in which the paddle parts 7 of multiple agitator parts 1 are arranged in an intermittent spiral shape centered on the axis of the rotating shaft 2 (see FIG. 8). In this agitator 3D, the edges of the paddle parts 7 of the agitator parts 1 adjacent vertically are arranged close to each other with almost no gaps.

As described above, the agitator part 1 of this embodiment includes a boss 5 that is attached to the rotating shaft 2 so as to be movable in the axial direction and rotatable about the axis, a shaft part 6 that is attached to the boss 5 and extends to the side of the boss 5, and a paddle body 8 having a paddle part 7 attached to one end of the shaft part 6, and the inclination angle θ of the paddle part 7 with respect to a plane P perpendicular to the axis C of the rotating shaft 2 can be adjusted. This makes it possible to adjust the mounting position of the boss 5 with respect to the rotating shaft 2 and the inclination angle θ of the paddle part 7 when attaching multiple agitator parts 1 to the rotating shaft 2. Therefore, by combining agitator parts 1 with simple shapes, an infinite variety of agitator blades can be created that are suitable for the viscosity of the fluid and the form of agitation.

Next, a solid-liquid mixing performance test using the mixing blades of the experimental example and the comparative example will be described.
In this test, a flat-bottom cylindrical tank made of acrylic resin (tank diameter: D = 0.15 m, liquid height: H = 0.15 m) was used as the stirring tank, and glycerin (density: ρ = 1256 kg·m ^-3 , viscosity: μ = 1.0 Pa·s) was used as the stirring liquid. Furthermore, the rotation speed of the rotating shaft was set to 32 rpm, glass beads (specific gravity: 2.5, volume ratio: 30 vol%) were used as the sedimentary particles, the liquid temperature was set to 21.8 to 22.3°C, and the blade diameter (d/D) of the stirring blade was set to 0.97. Then, the time until the glass beads that had settled in the liquid were dispersed was measured.

As impellers in the experimental examples, the above-mentioned multi-stage inclined paddle-type impeller 3A (inclination angles: 60 degrees, 45 degrees, 30 degrees) and the above-mentioned helical ribbon-style impeller 3C (inclination angle: 22 degrees) were used. Furthermore, as impellers in the comparative examples, the Supermix LR500 (existing impeller) and the shaftless helical ribbon impeller (existing impeller) from Satake Chemical Machinery Co., Ltd. were used.

As a result, in the experimental example, the dispersion of glass beads was observed about 5 minutes after the start of stirring with the stirring blade 3A (tilt angle: 60 degrees) (see FIG. 9(a)). In addition, in the experimental example, the dispersion of glass beads was observed about 10 minutes after the start of stirring with the stirring blade 3A (tilt angle: 45 degrees) (see FIG. 9(b)). In the experimental example, the dispersion of glass beads was observed about 30 minutes after the start of stirring with the stirring blade 3A (tilt angle: 30 degrees) (see FIG. 9(c)). Furthermore, in the experimental example, the dispersion of glass beads was observed about 90 seconds after the start of stirring with the stirring blade 3C (see FIG. 9(d)).
On the other hand, in the case of the comparative example LR500 (existing impeller), dispersion of the glass beads was observed about 90 seconds after the start of stirring (see FIG. 10(a)). Furthermore, in the case of the comparative example shaft-less helical ribbon impeller (existing impeller), dispersion of the glass beads was observed about 5 minutes after the start of stirring (see FIG. 10(b)).

In the impeller 3A of the experimental example, the performance differs depending on the inclination angle θ of the paddle portion 7, but it was found that the impeller 3A (inclination angle: 60 degrees) has almost the same mixing performance as the shaft-less helical ribbon impeller (existing impeller) of the comparative example. Furthermore, it was found that the impeller 3C of the experimental example exhibits mixing performance equivalent to that of the comparative example LR500 (existing impeller), which is generally considered to have high performance.
In this way, the stirring blades 3A and 3C of the experimental examples, which have a small number of parts, have a simple shape and exhibit good mixing performance, and are therefore considered to lead to significant cost reductions.

Next, a near-phase stirring performance test using the stirring blades of the experimental examples and the comparative example will be described.
In this test, a flat-bottom cylindrical tank made of acrylic resin (tank diameter: D = 0.15 m, liquid height: H = 0.15 m, volume: 2.65 L) was used as the stirring tank, the rotation speed of the rotating shaft was set to 30 rpm, and glycerin (density: ρ = 1256 kg m ^-3 , viscosity: μ = 0.6 Pa s) was used as the stirring liquid. In addition, starch (1.0 g/L), iodine (0.7 ml/L), and thiosulfuric acid (2.0 ml/L) were added to the side of the rotating shaft as a decolorization method. Furthermore, the liquid temperature was set to 22.5 to 22.7°C, and the blade diameter (d/D) of the stirring blade was set to 0.97. Then, the liquid colored with iodine and the liquid mixed with the decolorizing agent (thiosulfuric acid) were mixed, and the time until the color of iodine disappeared was measured.
The impellers used in the experimental examples and comparative examples were the same as those used in the solid-liquid mixing performance test.

As a result, as shown in Table 1, in the case of the stirring blade 3A of the experimental example (tilt angle: 60 degrees), the color of iodine disappeared about 300 seconds after the start of stirring (see FIG. 11(c)). In addition, in the case of the stirring blade 3A of the experimental example (tilt angle: 45 degrees), the color of iodine disappeared about 190 seconds after the start of stirring (see FIG. 11(b)). In addition, in the case of the stirring blade 3A of the experimental example (tilt angle: 30 degrees), the color of iodine disappeared about 270 seconds after the start of stirring (see FIG. 11(a)). Furthermore, in the case of the stirring blade 3C of the experimental example, the color of iodine disappeared about 190 seconds after the start of stirring (see FIG. 11(d)).
On the other hand, in the case of the comparative example LR500 (existing impeller), the color of iodine disappeared about 130 seconds after the start of stirring (see FIG. 12(a)). Furthermore, in the case of the comparative example shaft-less helical ribbon impeller (existing impeller), the color of iodine disappeared about 190 seconds after the start of stirring (see FIG. 12(b)).

The figures shown in Table 1 indicate that the smaller the Pv (power per unit volume) and the shorter the mixing time, the higher the mixing performance. In the experimental example, the performance differed depending on the inclination angle θ of the paddle portion 7, and the mixing performance of the impeller 3A with an inclination angle θ of 45 degrees was the best. In addition, although it did not reach the comparative example LR500 (existing impeller), it exhibited almost the same performance as the comparative example shaftless helical ribbon impeller (existing impeller).
In this way, the stirring blades 3A and 3C of the experimental examples, which have a small number of parts, have a simple shape and exhibit good mixing performance, and are therefore considered to lead to significant cost reductions.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. In other words, the above embodiment illustrates an agitator part 1 in which the shaft part 6 of the paddle body 8 is attached to the boss 5 so as to be movable in the axial direction, but the present invention is not limited to this, and for example, the agitator part 1 may be attached to the boss 5 so that the shaft part 6 of the paddle body 8 cannot move in the axial direction.

In the above embodiment, the agitator part 1 is illustrated in which the shafts 6 of the multiple paddle bodies 8 are arranged on the same straight line, but this is not limited thereto. For example, as shown in FIG. 13, the agitator part 1 may be configured such that the shafts 6 of the multiple paddle bodies 8 are arranged parallel to each other. In this case, the outer diameter dimension D of the paddle body 8 can be adjusted over a larger range.

In the above embodiment, the set screws 13 and 17 are used as examples of the attachment of the boss 5 to the rotating shaft 2 and the attachment of the paddle body 8 to the boss 5, but this is not limiting and, for example, fitting, a clamp mechanism, other screws, or other attachment methods may be used. Furthermore, in the above embodiment, the boss 5 may be splined to the rotating shaft 2, and the shaft portion 6 of the paddle body 8 may be splined to the boss 5.

In the above embodiment, the stirring part 1 is exemplified in which the tilt angle θ of the paddle part 7 is adjusted by rotating the shaft part 6 of the paddle body 8 about its axis relative to the boss 5, but this is not limited thereto. For example, the stirring part 1 may be configured such that the paddle part 7 is provided on one end side of the shaft part 6 of the paddle body 8 so as to be rotatable about its axis, and the tilt angle θ of the paddle part 7 is adjusted by rotating the paddle part 7 about its axis relative to the shaft part 6.

In the above embodiment, the stirring part 1 is exemplified as adjusting the inclination angle θ of the paddle portion 7 in each of the multiple paddle bodies 8, but this is not limited thereto. For example, the stirring part 1 may be provided with an adjustment mechanism (e.g., a gear mechanism) that simultaneously adjusts the inclination angle θ of each of the paddle portions 7 in each of the multiple paddle bodies 8.

Furthermore, in the above embodiment, an agitator blade 3A in which the bosses 5 of adjacent agitator parts 1 are spaced apart in the axial direction of the rotating shaft 2 is illustrated, but this is not limited thereto. For example, as shown in FIG. 14, an agitator blade 3A in which the bosses 5 of adjacent agitator parts 1 are spaced apart in the axial direction of the rotating shaft 2 may be used.

The present invention is not limited to the embodiments detailed above, and various modifications and variations are possible within the scope of the claims of the present invention.

The present invention is widely used as a technology for mixing fluids. In particular, it is suitable for use as a mixing technology in various fields such as general chemical industry, petrochemical industry, resin industry, rubber industry, adhesive industry, paint and ink industry, magnetic materials industry, paper industry, pharmaceutical industry, food industry, fermentation and brewing industry, mining, ceramics, environmental equipment, civil engineering and construction, and energy-related industries.

1; stirring part, 2; rotating shaft, 3A-3D; stirring blade, 5; boss, 6; shaft portion, 7; paddle portion, 8; paddle body, A1; first arrangement form, A2; second arrangement form, C; axis of rotating shaft, P; plane, θ; inclination angle of paddle portion, D; outer diameter dimension of paddle body.

Claims (5)

A stirring component that is attached to a rotating shaft along the axial direction to form a stirring blade,
A boss attached to the rotating shaft so as to be movable in an axial direction and rotatable about the rotating shaft;
a paddle body having a shaft portion attached to the boss and extending laterally from the boss, and a paddle portion attached to one end side of the shaft portion,
The inclination angle of the paddle portion with respect to a plane perpendicular to the axis of the rotation shaft is adjustable ,
The agitating part is characterized in that a plurality of the paddle bodies are provided around the axis of the rotation shaft . A stirring component that is attached to a rotating shaft along the axial direction to form a stirring blade,
A boss attached to the rotating shaft so as to be movable in an axial direction and rotatable about the rotating shaft;
a paddle body having a shaft portion attached to the boss and extending laterally from the boss, and a paddle portion attached to one end side of the shaft portion,
The inclination angle of the paddle portion with respect to a plane perpendicular to the axis of the rotation shaft is adjustable ,
The agitating part is characterized in that the shaft portion is attached to the boss so as to be rotatable around its axis . A stirring component that is attached to a rotating shaft along the axial direction to form a stirring blade,
A boss attached to the rotating shaft so as to be movable in an axial direction and rotatable about the rotating shaft;
a paddle body having a shaft portion attached to the boss and extending laterally from the boss, and a paddle portion attached to one end side of the shaft portion,
The inclination angle of the paddle portion with respect to a plane perpendicular to the axis of the rotation shaft is adjustable ,
The agitating part is characterized in that the shaft portion is attached to the boss so as to be movable in the axial direction . A stirring component that is attached to a rotating shaft along the axial direction to form a stirring blade,
A boss attached to the rotating shaft so as to be movable in an axial direction and rotatable about the rotating shaft;
a paddle body having a shaft portion attached to the boss and extending laterally from the boss, and a paddle portion attached to one end side of the shaft portion,
The inclination angle of the paddle portion with respect to a plane perpendicular to the axis of the rotation shaft is adjustable ,
When attaching the plurality of stirring parts to the rotating shaft, the attachment position of the boss and the inclination angle of the paddle part relative to the rotating shaft are adjusted,
a first arrangement form in which the paddle portions of the plurality of stirring parts are arranged along the axial direction of the rotation shaft;
a second arrangement in which the paddle portions of the plurality of agitating parts are arranged in a spiral shape centered on the axis of the rotating shaft . A rotation axis;
An agitating impeller comprising: a plurality of agitating parts according to claim 1 attached to the rotating shaft along the axial direction.

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