JP2021041398A - Agitation blade and agitation device - Google Patents

Abstract

To provide an agitation blade and agitation device capable of achieving sophistication of dispersion and blending of a targeted object having high viscosity.SOLUTION: There is provided an agitation blade A1 which is installed to an agitation device to be rotated around an axial direction z. The blade comprises a base 1 installed to the pivot of the agitation device, and plural blade parts 2 installed radially to the base 1. The blade part 2 includes a first blade part 2A having a root part 21 connected to the base 1 and a tip part 22 connected to the root part 21 at a side opposite to the base 1. A first angle α1 formed by a circumferential direction θ and the root part 21 leans to be located at one side in an axial direction z as heading for the front in the circumferential direction θ, and an absolute value of a third angle α3 formed by a radial direction r and the tip part 22 is 60° or more but 100° or less. The absolute value of a fourth angle α4 formed by the circumferential direction θ and the tip part 22 in view of the axial direction z is 0° or more but 25° or less when defining a case of leaning to be located inward in the radial direction r as heading for the front in the direction θ as positive.SELECTED DRAWING: Figure 3

Description

The present invention relates to a stirrer blade and a stirrer.

A stirring device having a stirring blade is used as a device for dispersing and mixing an object such as a liquid or a mixture of powder and liquid. Patent Document 1 discloses an example of a conventional stirring blade and a stirring device. In the configuration disclosed in this document, a rotary blade is attached to the tip of a rotary shaft that is driven to rotate. The rotary blade is rotated in a container containing the target object to perform stirring such as dispersion and mixing of the target object.

Here, stirring is a concept that includes dispersion and mixing. Dispersing an object is an operation of scattering another substance (for example, liquid or powder) in a substance (for example, liquid) that is chemically in one phase in a microscopic state. Further, mixing the target object is an operation of stirring the target object contained in the container in the container so as to have a more uniform property. In order to improve the dispersion in the stirring device, it is important to concentrate the force of the stirring blade on a small part of the target object, and it often acts in a region existing in the immediate vicinity of the stirring blade. On the other hand, in order to further improve the mixing in the stirring device, it is important to apply the force of the stirring blade to the entire target object housed in the container to make it flow. In this way, enhancing the dispersion and mixing with one stirring blade is required to achieve both contradictory behaviors. In particular, the higher the viscosity of the target object, the more difficult it is to enhance the dispersion and mixing.

Japanese Unexamined Patent Publication No. 10-180073

The present invention has been conceived under the above circumstances, and an object of the present invention is to provide a stirring blade and a stirring device capable of improving the dispersion and mixing of a target object having a high viscosity. Make it an issue.

The stirring blade provided by the first aspect of the present invention is a stirring blade attached to a stirring device and rotated about an axial direction, with respect to a base portion attached to the rotating shaft of the stirring device and the base portion. First, the blade portion includes a plurality of blade portions radially attached to the blade portion, and the blade portion has a root portion connected to the base portion and a tip portion connected to the root portion on the opposite side of the base portion. The first angle, which includes the blade portion and is the angle formed by the circumferential direction and the root portion, is inclined so as to be located on one side in the axial direction toward the front in the circumferential direction, and the radial direction and the tip portion form. The absolute value of the third angle, which is an angle, is 60 ° or more and 100 ° or less, and the fourth angle, which is the angle formed by the circumferential direction and the tip portion in the axial view, is within the radial direction toward the front in the circumferential direction. It is characterized in that the absolute value is 0 ° or more and 25 ° or less when the case of tilting so as to be located in the direction is positive.

In a preferred embodiment of the present invention, the absolute value of the first angle is 5 ° or more and 50 ° or less.

In a preferred embodiment of the present invention, the absolute value of the second angle, which is the angle formed by the radial direction and the root portion, is 0 ° or more and 50 ° or less.

In a preferred embodiment of the present invention, the first blades included in the plurality of blades have the same second angle and the same third angle.

In a preferred embodiment of the present invention, the absolute value of the first sub-angle, which is the angle formed by the first boundary portion, which is the boundary between the base portion and the root portion, in the radial direction in the axial direction is 20 ° or more. The absolute value of the second sub-angle, which is 80 ° or less and is the angle formed by the second boundary portion, which is the boundary between the root portion and the tip portion, in the radial direction in the axial view is from the first sub-angle. Is also big.

In a preferred embodiment of the present invention, the plurality of blade portions include the first blade portion having an even number of 4 or more, and the first blade portion having a relatively large second angle and the first blade portion having a relative size. The first blades having a small third angle are alternately arranged in the circumferential direction.

In a preferred embodiment of the present invention, the plurality of blade portions include a second blade portion arranged between the two first blade portions, and the second blade portion is flat as a whole. The fifth angle, which is an angle formed in the radial direction, is 0 ° or more and 50 ° or less.

The stirring device provided by the second aspect of the present invention is provided by a container for accommodating an object to be agitated, a rotating shaft inserted into the container, and a first aspect of the present invention attached to the rotating shaft. It is characterized by comprising a stirring blade provided.

According to the present invention, it is possible to improve the dispersion and mixing of a target object having a high viscosity.

Other features and advantages of the present invention will become more apparent with the detailed description given below with reference to the accompanying drawings.

It is a top view which shows the stirring blade which concerns on 1st Embodiment of this invention. It is a front view which shows the stirring blade which concerns on 1st Embodiment of this invention. It is sectional drawing which follows the line III-III of FIG. It is sectional drawing which follows the IV-IV line of FIG. It is sectional drawing which shows the stirring apparatus using the stirring blade which concerns on 1st Embodiment of this invention. (A) is a velocity gradient distribution portion showing the analysis result of the stirring blade according to the first embodiment of the present invention, and (b) is a velocity distribution diagram of a comparative example. It is sectional drawing which shows the 1st modification of the stirring blade which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the 2nd modification of the stirring blade which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the 3rd modification of the stirring blade which concerns on 1st Embodiment of this invention. It is a perspective view which shows the stirring blade which concerns on 2nd Embodiment of this invention. It is a top view which shows the stirring blade which concerns on 2nd Embodiment of this invention. It is a front view which shows the stirring blade which concerns on 2nd Embodiment of this invention. It is sectional drawing which follows the XIV-XIV line of FIG. It is sectional drawing which follows the XV-XV line of FIG. It is a velocity gradient distribution part which shows the analysis result of the stirring blade which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the stirring blade which concerns on the comparative example of the stirring blade which concerns on 2nd Embodiment of this invention. (A) to (c) are cross-sectional views of a main part showing a modified example of the stirring blade according to the second embodiment of the present invention. It is a perspective view which shows the stirring blade which concerns on 3rd Embodiment of this invention. It is a top view which shows the stirring blade which concerns on 3rd Embodiment of this invention. It is a front view which shows the stirring blade which concerns on 3rd Embodiment of this invention. It is sectional drawing which follows the XXI-XXI line of FIG. FIG. 5 is a cross-sectional view taken along the line XXII-XXII of FIG. It is a perspective view which shows the stirring blade which concerns on 4th Embodiment of this invention. It is a top view which shows the stirring blade which concerns on 4th Embodiment of this invention. It is a front view which shows the stirring blade which concerns on 4th Embodiment of this invention. FIG. 6 is a cross-sectional view taken along the line XXVI-XXVI of FIG. 24. FIG. 6 is a cross-sectional view taken along the line XXVII-XXVII of FIG. 24. It is a perspective view which shows the stirring blade which concerns on 5th Embodiment of this invention. It is a figure which shows the flow pattern of the stirring object.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

In the following description, stirring is a concept including dispersion and mixing. Dispersing a target object means an action of scattering another substance (for example, liquid or powder) in a microscopic state in a substance (for example, liquid) which is chemically in one phase. Further, mixing the target object means an operation of stirring the target object contained in the container in the container so as to have a more uniform property.

Terms such as "first," "second," and "third" in the present disclosure are used merely as labels and are not necessarily intended to permutate those objects.

<First Embodiment>
1 to 5 show a stirring blade and a stirring device according to the first embodiment of the present invention. The stirring blade A1 of the present embodiment includes a base 1 and a plurality of blades 2.

FIG. 1 is a plan view showing the stirring blade A1. FIG. 2 is a front view showing the stirring blade A1. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. FIG. 5 is a cross-sectional view showing a stirring device B1 using the stirring blade A1. The circumferential direction θ is a direction in which the stirring blade A1 rotates, and is a direction generally referred to as a circumferential direction with respect to the axial direction z and the radial direction r. Further, the arrows in these figures indicate the direction in which the stirring blade A1 rotates. FIG. 5 shows a state in which the target object T is fluidized by the rotation of the stirring blade A1.

The stirring blade A1 is attached to, for example, the stirring device B1 shown in FIG. The stirring device B1 includes a container 81, a rotating shaft 82, and a driving unit 83. The container 81 houses the object object T, which is the object of dispersion and mixing. A stirring blade A1 is attached to the tip of the rotating shaft 82, and the rotating shaft 82 is inserted into the target object T of the container 81. The drive unit 83 rotates the rotating shaft 82 in the axial direction z, and includes, for example, a motor. As other components of the stirring device B1, for example, a housing that supports the container 81 and the driving unit 83, a control unit that controls the driving of the driving unit 83, and the like may be appropriately adopted. The type and properties of the target object T are not limited at all. Examples of the target object T having a relatively high viscosity include a high-viscosity slurry-like liquid containing CMC (carboxymethyl cellulose), carboxyvinyl polymer, xanthan gum, etc., and a high-viscosity slurry-like liquid containing carbon black. Be done.

The stirring device to which the stirring blade A1 is attached is not limited in any way. For example, the rotation shaft 82 may enter upward from the bottom of the container 81. In this case, the stirring blade A1 is attached to the upper end of the rotating shaft 82. Further, for example, a shaft seal may be provided on the bottom of the container 81. Further, as other components of the stirring device B1, for example, a housing for supporting the container 81 and the driving unit 83, a control unit for controlling the driving of the driving unit 83, and the like may be appropriately adopted.

The material of the stirring blade A1 is not particularly limited, and a material suitable for dispersing and mixing the target object T such as metal and resin is appropriately selected. A preferred metal constituting the stirring blade A1 is, for example, stainless steel. Further, surface processing such as an arbitrary coating may be applied to an appropriate position on the surface of the stirring blade A1. Further, the stirring blade A1 may have a base portion 1 and a blade portion 2 integrally formed, or may have a configuration in which a plurality of parts are combined. Further, as a structure for attaching the stirring blade A1 to the rotating shaft 82 of the stirring device B1, attachment mechanisms such as various engaging mechanisms and fastening mechanisms may be adopted, or at least a part of the rotating shaft 82 and the stirring blade A1. And may be integrally formed.

The base portion 1 supports a plurality of blade portions 2 and is a portion fixed to the rotating shaft 82. The shape and size of the base 1 are not particularly limited. The base 1 of the present embodiment has a cylindrical shape with the axial direction z as the axis.

The plurality of blade portions 2 are attached radially to the base portion 1, and each of them is arranged in the circumferential direction θ. The number of the plurality of blades 2 is not limited in any way. In the present embodiment, the case where the stirring blade A1 is provided with three blade portions 2 will be described as an example. The three blades 2 are arranged at equal pitches, and in the illustrated example, the pitch is 120 °. In the present embodiment, all three blades 2 are the first blades 2A in the present invention.

The blade portion 2 has a root portion 21 and a tip portion 22. The root portion 21 is connected to the base portion 1 and extends obliquely upward in the axial direction z with respect to the base portion 1. The tip portion 22 is connected to the root portion 21 on the side opposite to the base portion 1, and in the illustrated example, extends upward from the root portion 21 in the axial direction z. The base portion 1, the root portion 21, and the tip portion 22 may be integrally formed from a single material, or may be joined to each other by using an engagement (fitting) such as insertion or a joining method such as welding. It may have been done.

The root portion 21 has an inner surface 211 and an outer surface 212. The inner surface 211 is a surface facing inward in the radial direction r. The outer surface 212 is a surface facing outward in the radial direction r. The shapes of the inner surface 211 and the outer surface 212 are not particularly limited. In the illustrated example, the inner surface 211 and the outer surface 212 are substantially planes parallel to each other.

The tip portion 22 has an inner surface 221 and an outer surface 222. The inner surface 221 is a surface facing inward in the radial direction r. The outer surface 222 is a surface facing outward in the radial direction r. The shapes of the inner surface 221 and the outer surface 222 are not particularly limited. In the illustrated example, the inner surface 211 and the outer surface 222 are substantially planes parallel to each other.

The relative sizes of the root portion 21 and the tip portion 22 are not particularly limited. In the illustrated example, the length of the root portion 21 in the cross section shown in FIG. 3 is longer than the length of the tip portion 22.

In this embodiment, the first angle α1 shown in FIG. 2 is defined. The alternate long and short dash line in the figure is a straight line along the circumferential direction θ. The first angle α1 is an angle formed by the circumferential direction θ and the root portion 21 (center line of the root portion 21), and is located on one side (upper side in the figure) of the axial direction z toward the front of rotation in the circumferential direction θ. The case of tilting like this is positive.

In the present embodiment, the first angle α1 is 5 ° or more and 50 ° or less. In the present invention, the absolute value of the first angle α1 is preferably 5 ° or more and 50 ° or less.

Further, in the present embodiment, the second angle α2 and the third angle α3 shown in FIG. 3 are defined. The straight line of the horizontal alternate long and short dash line in the figure is a straight line along the radial direction r. The straight line of the alternate long and short dash line extending along the root portion 21 is an average center line based on the overall shape of the root portion 21. In the illustrated example, the root portion 21 has a linear cross section extending diagonally in the drawing. Therefore, the center line of the root portion 21 is a straight line located between the inner surface 211 and the outer surface 222. The straight line of the alternate long and short dash line extending along the tip 22 is an average center line based on the overall shape of the tip 22. In the illustrated example, the tip portion 22 has a linear cross section extending diagonally in the drawing. Therefore, the center line of the tip portion 22 is a straight line located between the inner surface 221 and the outer surface 222. Even if the root portion 21 and the tip portion 22 have a gently bent or curved shape, a geometrically average center line may be appropriately determined based on the overall shape.

The second angle α2 is an angle formed by the radial direction r and the root portion 21 (center line of the root portion 21) so that the more it is located on the outer side in the radial direction, the more it is located on one side (upper side in the figure) in the axial direction z. The case of tilting is positive. The second angle α2 is an angle corresponding to a so-called elevation angle. When the root portion 21 is parallel to the radial direction r, the second angle α2 is 0 °. The third angle α3 is an angle formed by the root portion 21 (center line of the root portion 21) and the tip portion 22 (center line of the tip portion 22). The case where it is tilted so that it is located on the upper center) is positive. The third angle α3 is an angle corresponding to a so-called elevation angle. When the tip portion 22 is parallel to the radial direction r, the third angle α3 is 0 °.

In the present embodiment, the absolute value of the second angle α2 is 0 ° or more and 50 ° or less. The absolute value of the third angle α3 is 60 ° or more and 100 ° or less.

Further, in the present embodiment, the fourth angle α4 shown in FIG. 4 is defined. The straight line of the alternate long and short dash line extending along the tip 22 is an average center line based on the overall shape of the tip 22. In the illustrated example, 22 has a linear cross section extending diagonally in the figure. Therefore, the center line of the tip portion 22 is a straight line located between the inner surface 221 and the outer surface 222. Even if the tip portion 22 has a gently bent or curved shape, a geometrically average center line may be appropriately determined based on the overall shape.

The fourth angle α4 is an angle formed by the circumferential direction θ and the tip portion 22 in the axial direction z view, and is positive when it is tilted so as to be located inward in the radial direction r toward the front of rotation in the circumferential direction θ. ..

In the present embodiment, the absolute value of the fourth angle α4 is 0 ° or more and 25 ° or less.

Next, the operations of the stirring blade A1 and the stirring device B1 will be described.

In the present embodiment, the blade portion 2 has a root portion 21 and a tip portion 22. The root portion 21 is provided so as to be inclined so that the first angle α1 is a positive angle with respect to the circumferential direction θ. According to the inventor's test and analysis, it was found that the provision of the root portion 21 is preferable for efficiently promoting the mixing of the target object T having a high viscosity in the container 81. Further, by providing the tip portion 22 forming the third angle α3 and providing the fourth angle α4 at the above-mentioned angle, it is possible to promote the dispersion while promoting the mixing. all right. That is, the inventor states that the relationship between the first angle α1, the third angle α3, and the fourth angle α4 is important in order to obtain sufficient dispersion while achieving a high degree of mixing as a result of tests and analysis. I found.

FIG. 6A shows the distribution of the velocity gradient near the surface in the fluid analysis of the stirring blade A1. In particular, in the tip portion 22, a region having a high velocity gradient is recognized. The wider the region where the velocity gradient is high and the higher the value of the velocity gradient, the higher the shear stress generated in the target object T in the vicinity of the tip portion 22 can be increased. By increasing the shear stress, dispersion in the target object T having a high viscosity can be promoted. FIG. 6B shows a comparative example in the case where the tip portion 22 is not provided. In this Comparative Example X, the portion of the stirring blade A1 that is the tip portion 22 is incorporated as a part of the root portion 21, and the size of the blade portion 2 in the radial direction r is the same as that of the stirring blade A1. It is shortened to be. The maximum value of the velocity gradient near the surface of Comparative Example X is lower than that of the stirring blade A1.

Further, for various combinations of the first angle α1 and the third angle α3, after obtaining the velocity gradient distribution shown in FIG. 6, the evaluation was performed. As a result, sufficient dispersion was achieved while achieving the above-mentioned high mixing. It has been found that the absolute value of the third angle α3 must be 60 ° or more and 100 ° or less in order to obtain it. Further, it was found that in order to obtain such a good state, the absolute value of the fourth angle α4 must be 0 ° or more and 25 ° or less.

In particular, when the absolute value of the third angle α3 is 60 ° or more and 100 ° or less, the tip portion 22 is in a more upright posture along the axial direction z than the root portion 21. The tip portion 22 is set so that the absolute value of the fourth angle α4 is 0 ° or more and 25 ° or less. As a result, in the state where the stirring blade A1 is rotating, the tip portion 22 rubs (rubs) against the target object T more prominently than the behavior of stirring the target object T. As a result, the velocity gradient in the vicinity of the tip portion 22 can be further increased, and dispersion can be promoted. Further, the maximum outer diameter of the stirring blade A1 is reduced because the tip portion 22 is in an upright posture. As a result, it is possible to reduce the driving force required for rotationally driving the stirring blade A1, and it is possible to save energy. As described above, according to the stirring blade A1, it is possible to improve the dispersion and mixing of the target object T having a high viscosity.

Further, in order to obtain a good velocity gradient distribution, the first angle α1 is preferably 5 ° or more and 50 ° or less.

7 to 28 show modifications and other embodiments of the present invention. In these figures, the same or similar elements as those in the above embodiment are designated by the same reference numerals as those in the above embodiment.

<First Embodiment 1st Modified Example>
FIG. 7 shows a first modification of the stirring blade A1. In the stirring blade A11 of this modified example, both the second angle α2 and the third angle α3 have negative values. However, the absolute value of the second angle α2 is 0 ° or more and 50 ° or less, and the absolute value of the third angle α3 is 60 ° or more and 100 ° or less.

<First Embodiment Second Modification Example>
FIG. 8 shows a second modification of the stirring blade A1. In the stirring blade A11 of this modified example, the second angle α2 is a positive value, and the third angle α3 is a negative value. However, the absolute value of the second angle α2 is 0 ° or more and 50 ° or less, and the absolute value of the third angle α3 is 60 ° or more and 100 ° or less.

<First Embodiment Third Modification Example>
FIG. 9 shows a second modification of the stirring blade A1. In the stirring blade A11 of this modified example, the second angle α2 is a negative value, and the third angle α3 is a positive value. However, the absolute value of the second angle α2 is 0 ° or more and 50 ° or less, and the absolute value of the third angle α3 is 60 ° or more and 100 ° or less.

Even when the stirring device B1 was configured by using the stirring blades A11 to A13, the above-mentioned good mixing and dispersion were obtained as in the case of using the stirring blade A1.

<Second Embodiment>
10 to 14 show a stirring blade according to a second embodiment of the present invention.

FIG. 10 is a perspective view showing the stirring blade A2. FIG. 11 is a plan view showing the stirring blade A2. FIG. 12 is a front view showing the stirring blade A2. FIG. 13 is a cross-sectional view taken along the line XIV-XIV of FIG. FIG. 14 is a cross-sectional view taken along the line XV-XV of FIG.

In the stirring blade A2, a mounting hole 19 is provided in the base 1 as a structure for mounting the stirring blade A2 on the rotating shaft 82. The size of the stirring blade A2 is not particularly limited, and in the present embodiment, the diameter of the stirring blade A2 is about 40 mm.

The base 1 of the present embodiment has a shape along the radial direction r and the circumferential direction θ, and has a flat plate shape perpendicular to the axial direction z. Further, in the illustrated example, the base portion 1 has a substantially triangular shape in the axial z view.

The base 1 has an upper surface 11 and a lower surface 12. The upper surface 11 is a surface of the base 1 that faces upward in the axial direction z. The lower surface 12 is a surface of the base 1 that faces downward in the axial direction z.

In the stirring blade A2, the base 1 and the blade 2 are formed by cutting and bending an integral metal plate material. Therefore, the first boundary portion 23 is provided at the boundary between the base portion 1 and the root portion 21, and the second boundary portion 24 is provided at the boundary between the root portion 21 and the tip portion 22.

Also in the present embodiment, the sizes of the first angle α1, the second angle α2, the third angle α3, and the fourth angle α4 are set to the same sizes as the sizes of the stirring blade A1 described above.

Further, in the present embodiment, the first sub-angle β1 and the second sub-angle β2 shown in FIG. 11 are defined. In the figure, the arrow line of the alternate long and short dash line extending along each blade portion 2 is the direction in which the blade portion 2 extends (the radial direction r corresponding to the direction in which the blade portion 2 extends). The straight line of the alternate long and short dash line extending along the first boundary portion 23 is an average center line based on the overall shape of the first boundary portion 23. In the illustrated example, the first boundary portion 23 has a linear shape. Therefore, the center line of the first boundary portion 23 is a straight line that overlaps the entire first boundary portion 23. The straight line of the alternate long and short dash line extending along the second boundary portion 24 is an average center line based on the overall shape of the second boundary portion 24. In the illustrated example, the second boundary portion 24 has a linear shape. Therefore, the center line of the second boundary portion 24 is a straight line that overlaps the entire second boundary portion 24. Even if the first boundary portion 23 and the second boundary portion 24 have a gently bent or curved shape, if the geometrically average center line is appropriately determined based on the overall shape. Good.

The first sub-angle β1 is an angle formed by the radial direction r (arrow line of the one-point chain line) and the first boundary portion 23 (center line of the first boundary portion 23) in the axial z view. When the first boundary portion 23 is along the circumferential direction θ and is perpendicular to the radial direction r, the first sub-angle β1 is 90 °. The second sub-angle β2 is an angle formed by the radial direction r (arrow line of the one-point chain line) and the second boundary portion 24 (center line of the second boundary portion 24) in the axial z view. When the second boundary portion 24 is along the circumferential direction θ and is perpendicular to the radial direction r, the second sub-angle β2 is 90 °. Further, the first sub-angle β1 and the second sub-angle β2 are positioned outward in the radial direction so that the first boundary portion 23 and the second boundary portion 24 move backward in the axial direction z (rotational direction) in the axial z view. It takes a positive value when it is tilted to do so, and takes a negative value when it is the opposite.

In the present embodiment, the absolute value of the first sub-angle β1 is 20 ° or more and 80 ° or less. Further, the absolute value of the second sub-angle β2 is larger than that of the first sub-angle β1.

Also in this embodiment, the same effect as that of the stirring blade A1 shown in FIG. 7 can be obtained, and the dispersion and mixing of the target object T having a high viscosity can be improved.

Further, in the present embodiment, when the first sub-angle β1 is 20 ° or more and 80 ° or less, the root portion 21 is in a twisted posture with respect to the circumferential direction θ (rotational direction) in the axial z view. As can be understood from 11, when the stirring blade A2 rotates, the root portion 21 pushes the target object T outward in the circumferential direction θ. Further, as can be understood from FIG. 14, since the second angle α1 is set, when the stirring blade A2 rotates, the root portion 21 pushes the target object T downward in the axial direction z. As a result, as shown in FIG. 5, the rotation of the stirring blade A2 causes the target object T to flow diagonally downward from the stirring blade A2 toward the bottom of the container 81. Then, as this proceeds along the bottom portion and the side wall portion of the container 81, the target object T largely flows in the container 81. As a result, mixing of the target object T can be promoted.

Further, in the present embodiment, the absolute value of the second sub-angle β2 is larger than that of the first sub-angle β1. As a result, as can be understood from FIG. 11, the tip portion 22 is in a posture along the circumferential direction θ with respect to the root portion 21. As a result, the tip portion 22 has a smaller function of pushing (mixing) the target object T than the root portion 21, and has a large friction (friction) with the target object T. This is preferable for improving the velocity gradient (shear stress) of the target object T in the vicinity of the tip portion 22 and promoting the dispersion of the target object T.
Further, it has been confirmed that the tip portion 22 exhibits an effect of improving the dispersion force more than the effect of increasing the area of the portion where the speed of the blade is high due to the tip bending. Specifically, the dispersion test was actually performed using two stirring blades A2 having a bent tip and a stirring blade A2'showing a non-bent tip shown in FIG. It was. The unfolded shapes of the stirring blade A2 and the stirring blade A2'are the same, only the difference is whether or not the tip is bent. Since the tip of the stirring blade A2'is not bent, the size r in the radial direction is larger than that of the stirring blade A2. Here, when a dispersion test was performed on both of them at the same rotation speed, the reached particle diameters of the particles contained in the target object T were almost the same for both the stirring blade A2 and the stirring blade A2', but the energy required for stirring was obtained. The stirring blade A2'was about 20% higher than the stirring blade A2. Since both the stirring blade A2 and the stirring blade A2'have the same deployed shape, the surface area of the blade is the same, and since the test was performed at the same rotation speed, the speed of the blade tip is faster for the stirring blade A2'with a larger blade diameter. Generally, it is known that the faster the blade speed and the higher the stirring energy, the faster the dispersion progresses, but the reached particle diameters of the stirring blade A2 and the stirring blade A2'are almost the same. When the tip of the blade is bent, the area of the high-speed part becomes wider than that of a blade with the same blade diameter and the tip is not bent, and improvement of the dispersion force can be expected. It was confirmed that there is an effect of improving the dispersion force more than the effect of the speed and area of the blade.
The effect of improving the dispersion force by bending the tip of the tip 22 is not limited to this embodiment, and the tip 22 of the first embodiment described above and the third to fifth embodiments described later. Is also expressed in the same manner.

<Modification example of the second embodiment>
(A) to (c) of FIG. 17 show a modification of the stirring blade A2. In the example shown in FIG. 6A, the cross-sectional shapes of the root portion 21 and the tip portion 22 are curved, respectively. The root portion 21 is gently curved so that the inner surface 211 side is convex. The tip portion 22 is gently curved so that the outer surface 222 side is convex. Even in such an example, the center line indicated by the alternate long and short dash line in the figure can be set as the geometric center line from the overall shapes of the root portion 21 and the tip portion 22, and the second angle α2 can be set. And the third angle α3 can be defined respectively. The direction and degree of curvature of the root portion 21 and the tip portion 22 are examples, and each may be curved in another manner.

In the example shown in FIG. 2B, the inner surface 211 and the outer surface 212 are curved outward in the thickness direction, respectively. In other words, the root portion 21 has a shape in which the thickness of the central portion is relatively thick. Further, the inner surface 221 and the outer surface 222 are each curved inward in the thickness direction. In other words, the tip portion 22 has a shape in which the thickness of the central portion is relatively thin. Even in such an example, the center line indicated by the alternate long and short dash line in the figure can be set as the geometric center line from the overall shapes of the root portion 21 and the tip portion 22, and the second angle α2 can be set. And the third angle α3 can be defined respectively. The direction and degree of curvature of the inner surface 211, the outer surface 212, the inner surface 221 and the outer surface 222 are examples, and each may be curved in another manner.

In the example shown in FIG. 3C, the cross-sectional shape of the base 1 is meandering. Even if the base portion 1 has such a shape, the second angle α2 is defined as the angle formed by the radial direction r and the root portion 21. Further, as the shape of the base 1, various shapes can be adopted as long as the effect intended in the present application described above is obtained. These points are the same in the stirring blade A1 and the subsequent embodiments.

<Third Embodiment>
18 to 22 show the stirring blade according to the third embodiment of the present invention. The stirring blade A3 of the present embodiment is different from the above-described embodiment in the configuration of the plurality of blade portions 2.

FIG. 18 is a perspective view showing the stirring blade A3. FIG. 19 is a plan view showing the stirring blade A3. FIG. 20 is a front view showing the stirring blade A3. FIG. 21 is a cross-sectional view taken along the line XXI-XXXI of FIG. FIG. 22 is a cross-sectional view taken along the line XXII-XXII of FIG.

The stirring blade A3 includes four blade portions 2. The number of blades 2 is not limited to 4 as the structure of the stirring blades A3 described below. Examples of the number of blades 2 suitable for the configuration intended in the present embodiment include an even number of 4 or more. The plurality of blade portions 2 includes two first blade portions 2A and two first blade portions 2B.

The first blade portion 2A and the first blade portion 2B have a root portion 21 and a tip portion 22, respectively, as described in the stirring blade A2, and have a second angle α2, a third angle α3, and a fourth angle α4. A first sub-angle β1 and a second sub-angle β2 are defined, respectively. As shown in FIG. 19, the two first blade portions 2A and the two first blade portions 2B are arranged alternately with each other. That is, the first blade portion 2A is arranged between the adjacent first blade portions 2B, and the first blade portion 2B is arranged between the adjacent first blade portions 2A.

As shown in FIGS. 21 and 22, the second angle α2 of the first blade portion 2A is larger than the second angle α2 of the first blade portion 2B. Correspondingly, the tip portion of the tip portion 22 of the first blade portion 2A is located above the tip portion of the tip portion 22 of the first blade portion 2B in the axial direction z.

Also in this embodiment, the same effect as that of the stirring blade A2 described above can be obtained, and the dispersion and mixing of the target object T having a high viscosity can be improved. Further, according to the test of the inventor, it is possible to further promote the mixing of the target object T by alternately arranging the first blade portions 2A and the first blade portions 2B having different second angles α2. It was found that there is. As a result, the time required for stirring the target object T can be shortened.

<Fourth Embodiment>
23 to 27 show the stirring blade according to the fourth embodiment of the present invention. The stirring blade A4 of the present embodiment is different from the above-described embodiment in the configuration of the plurality of blade portions 2.

FIG. 23 is a perspective view showing the stirring blade A4. FIG. 24 is a plan view showing the stirring blade A4. FIG. 25 is a front view showing the stirring blade A4. FIG. 26 is a cross-sectional view taken along the line XVI-XVI of FIG. 24. FIG. 27 is a cross-sectional view taken along the line XVII-XVII of FIG.

The plurality of blade portions 2 of the present embodiment includes a plurality of first blade portions 2A and a plurality of second blade portions 2C. The number of the plurality of first blade portions 2A and the plurality of second blade portions 2C is not particularly limited, and in the illustrated example, two first blade portions 2A and two second blade portions 2C are included. There is. The number of the first blade portion 2A and the second blade portion 2C is preferably an even number of the same number.

The first blade portion 2A has the same configuration as the first blade portion 2A in the stirring blade A2 and the stirring blade A3 described above. The second blade portion 2C is connected to the base portion 1 via the boundary portion 25, and has a flat shape as a whole.

As shown in FIG. 24, β3, which is an angle formed by the boundary portion 25 with the radial direction r in the axial direction z-view, is set to, for example, the same angle as the first sub-angle β1 of the first blade portion 2A.

As shown in FIG. 27, the angle formed by the average center line and the radial direction r based on the overall shape of the second blade portion 2C is defined as the fifth angle α5. The fifth angle α5 is set to, for example, the same angle range as the second angle α2, and specifically, is set to the same angle as, for example, the second angle α2.

Also in this embodiment, the same effect as that of the stirring blade A2 described above can be obtained, and the dispersion and mixing of the target object T having a high viscosity can be improved. Further, according to the test of the inventor, when the four blade portions 2 include the first blade portion 2A having the same angle and size, the first blade portion 2 under specific conditions (viscosity of the target object T, rotation speed, etc.) A phenomenon occurred in which bubbles were continuously retained in the vicinity of the tip portion 22 (for example, the inner surface 221) of the blade portion 2A. As a result, it was confirmed that the dispersion capacity was reduced. It has been found that this may be remarkable when the tip portions 22 of the four first blade portions 2A continue to pass through the same portion of the target object T. According to the present embodiment, the second blade portion 2C is arranged next to the first blade portion 2A, and the tip portion 22 is not continuously present. As a result, focusing on a certain portion of the target object T, when a certain tip portion 22 passes through that portion, the tip of the second blade portion 2C passes immediately after that, at a position away from the tip portion 22. By repeating this alternately, the bubbles existing in the vicinity of the tip portion 22 exhibit the behavior of being drawn toward the second blade portion 2C side by passing through the second blade portion 2C. As a result, it is possible to suppress the phenomenon in which bubbles are continuously retained in the vicinity of the tip portion 22, and it is possible to improve the dispersion capacity.

<Fifth Embodiment>
FIG. 28 shows a stirring blade according to a fifth embodiment of the present invention. In the stirring blade A5 of the present embodiment, the first sub-angle β1, the second sub-angle β2, and the third sub-angle β3 have the first boundary portion 23, the second boundary portion 24, and the third boundary portion 25 in the axial z view. It is tilted so as to be located outward in the radial direction r toward the front in the axial direction z (rotational direction), and takes a negative value. Other configurations of the stirring blade A5 of the present embodiment are the same as those of the stirring blade A4 according to the fourth embodiment described above.

FIG. 28 is a perspective view showing the stirring blade A5.

The plurality of blade portions 2 of the present embodiment includes a plurality of first blade portions 2A and a plurality of second blade portions 2C. The number of the plurality of first blade portions 2A and the plurality of second blade portions 2C is not particularly limited, and in the illustrated example, two first blade portions 2A and two second blade portions 2C are included. There is.

Also in this embodiment, the same effect as that of the stirring blade A2 described above can be obtained, and the dispersion and mixing of the target object T having a high viscosity can be improved. Further, according to the test of the inventor, it was found that it is possible to improve the dispersion force and to achieve both an ideal flow pattern for the flow of a highly viscous substance. This point will be described in detail below.

That is, when the first angle α1 of the stirring blade is a positive value, the flow pattern of the target object T becomes as shown in (1) in FIG. 29, but when the viscosity of the target object T increases, the target object T becomes The flow becomes worse from the edge of the container on the liquid level. However, it was found that when the discharge direction of the target object T from the stirring blade is obliquely upward, the flow pattern is as shown in (2) in the figure, and the fluidity of the container edge on the liquid surface is improved. Further, at the liquid level, the flow flows from the container edge toward the center, and the target object T is drawn from the center toward the stirring blade. Therefore, for example, when powder or the like is charged into the target object T, the container edge is used. It is difficult for powder or the like to adhere to the object, and the powder can be efficiently drawn into the target object T.
By setting the first angle α1 to a negative value, the target object T can be ejected diagonally upward, but if there is a bent portion at the tip that improves the dispersion force, the flow in the lateral direction becomes stronger, and the figure is shown in the figure. The flow pattern will be as shown in (3) inside, and the flow will not be ideal diagonally upward. Therefore, as in the stirring blade A5 of the present embodiment, the second blade portion 2C having no bending at the tip is provided, and the upward flow is strengthened to adjust the discharge direction, as shown in (2) in the figure. You can create an ideal flow pattern. In this way, the combination of the first blade portion 2A whose tip is bent to increase the dispersion force and the second blade portion 2C whose tip is not bent to adjust the discharge direction improves the dispersion force and the flow of highly viscous substances. It is possible to achieve both ideal flow patterns.

The stirring blade and the stirring device according to the present invention are not limited to the above-described embodiment. The specific configuration of each part of the stirring blade and the stirring device according to the present invention can be freely redesigned.

A1, A11, A13, A2, A2', A3, A4, A5: Stirring blade B1: Stirrer 1: Base 2: Blade part 2A: First blade part 2B: First blade part 2C: Second blade part 11: Top surface 12: Bottom surface 19: Mounting hole 21: Root portion 22: Tip portion 23: First boundary portion 24: Second boundary portion 25: Third boundary portion 81: Container 82: Rotating shaft 83: Drive unit 211: Inner surface 212: Outer surface 221: Inner surface 222: Outer surface α1: First angle α2: Second angle α3: Third angle α4: Fourth angle α5: Fifth angle β1: First sub-angle β2: Second sub-angle β3: Third sub-angle T: Target object r: Radial direction z: Axial direction θ: Circumferential direction

Claims (8)

A stirring blade that is attached to a stirring device and rotated in the axial direction.
A base attached to the rotating shaft of the stirrer and
Provided with a plurality of blades radially attached to the base.
The blade portion includes a first blade portion having a root portion connected to the base portion and a tip portion connected to the root portion on the side opposite to the base portion.
The first angle, which is the angle formed by the circumferential direction and the root portion, is inclined so as to be located on one side in the axial direction toward the front in the circumferential direction.
The absolute value of the third angle, which is the angle formed by the radial direction and the tip portion, is 60 ° or more and 100 ° or less.
The fourth angle, which is the angle formed by the circumferential direction and the tip portion in the axial view, has an absolute value of 0 when the case where it is tilted so as to be positioned inward in the radial direction toward the front in the circumferential direction is positive. A stirring blade characterized by having a temperature of ° or more and 25 ° or less. The stirring blade according to claim 1, wherein the absolute value of the first angle is 5 ° or more and 50 ° or less. The stirring blade according to claim 2, wherein the absolute value of the second angle, which is the angle formed by the radial direction and the root portion, is 0 ° or more and 50 ° or less. The stirring blade according to claim 3, wherein the first blades included in the plurality of blades have the same second angle and the same third angle. The absolute value of the first sub-angle, which is the angle formed by the first boundary portion, which is the boundary between the base portion and the root portion, in the axial direction in the axial direction is 20 ° or more and 80 ° or less.
4. The absolute value of the second sub-angle, which is the angle formed by the second boundary portion, which is the boundary between the root portion and the tip portion, in the axial direction in the axial direction is larger than the first sub-angle. The stirring blade according to. The plurality of blade portions include four or more even-numbered first blade portions.
Any of claims 3 to 5, wherein the first blade portion having a relatively large second angle and the first blade portion having a relatively small third angle are alternately arranged in the circumferential direction. The stirring blade described in the crab. The plurality of blades include a second blade arranged between the two first blades.
The stirring blade according to claim 1 or 2, wherein the second blade portion is entirely flat and the fifth angle, which is an angle formed in the radial direction, is 0 ° or more and 50 ° or less. A container for the object to be agitated and
The rotating shaft inserted into the container and
The stirring blade according to any one of claims 1 to 7 attached to the rotating shaft, and the stirring blade.
A stirrer, characterized in that it comprises.

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