JP7770517B2 - stirring device - Google Patents

Description

The present invention relates to an agitation device for emulsification and dispersion processes, and is used, for example, to produce slurries containing conductive materials.

Demand for batteries, such as lithium-ion secondary batteries and fuel cells, is expected to increase in the future, not only for power sources for portable electronic devices, but also for electric vehicles and for storing electricity generated by wind and solar power generation facilities. Furthermore, there is a demand not only for further improvements in the characteristics of the batteries themselves, such as miniaturization, weight reduction, and safety, but also for efficient and low-cost production of batteries with these characteristics.

The high-speed mixer disclosed in Patent Document 1 has been proposed as an effective means of solving this problem. This high-speed mixer has a rotating shaft concentrically installed within a cylindrical mixing vessel, and rotating blades with a diameter slightly smaller than that of the mixing vessel are attached to the rotating shaft. The high-speed rotation of the rotating blades mixes the liquid being treated while spreading it into a thin cylindrical film on the inner surface of the mixing vessel. The rotating blades have a porous cylindrical portion on the outer periphery, with many small holes drilled radially through the cylindrical body. This high-speed mixer has the advantage of being able to provide excellent mixing performance despite its simple structure of a cylindrical body with many small holes drilled in it. Furthermore, because there is no surface that collides with the liquid being treated, there is little wear even when treating liquids containing solid components, and there is little risk of metal components from the rotating blades being mixed into the liquid being treated.

The agitator system disclosed in Patent Document 2 uses the high-speed agitator described in Patent Document 1, and using this agitator system to produce battery electrode paint has the advantage of efficiently producing electrode paint suitable for improving battery performance while maintaining a high level of battery safety.

Japanese Patent Application Publication No. 11-347388 International Publication No. 2010/018771

In recent years, attempts have been made to use linear carbon such as carbon nanotubes (CNTs) as additives to batteries, resins, and other materials. Generally, linear carbon such as CNTs has superior properties, such as a larger specific surface area than conventional carbon materials. Therefore, replacing part of the conductive material in a lithium-ion secondary battery with CNTs or similar materials is expected to improve its performance. However, linear carbon such as CNTs has strong cohesion due to its large specific surface area, making it difficult to prepare a uniformly mixed and dispersed slurry. The inventors of the present invention conducted extensive research to resolve this issue and found that the above-mentioned problem could be solved by revising the arrangement of the multiple small holes that run radially through the porous cylindrical portion (tubular portion) of the rotating blade (rotating member). They also found that the above-mentioned problem could be further resolved by revising the surface structure of the container wall.

Specifically, the stirring device of the present invention is a stirring device that includes a container and a rotating member that rotates at high speed slightly inside the inner wall surface of the container, and stirs a stirring target that is present in a film-like form between the rotating member and the inner wall surface by centrifugal force from the rotating member, and the rotating member has a cylindrical portion that is positioned with a small gap between it and the inner wall surface of the container, and the side surface of the cylindrical portion is divided into a first region that is partitioned in a band-like shape in the circumferential direction of the cylindrical portion and has a plurality of holes that penetrate in an inward and outward direction, and a second region that is partitioned in a band-like shape in the circumferential direction of the cylindrical portion and has a plurality of holes that penetrate in an inward and outward direction such that the opening ratio of the first region is smaller than that of the first region. The rotating member is configured of a second region formed on the first region, the first region being arranged in a portion including the center of the cylindrical portion in the height direction, the second region being arranged from the upper end of the first region to the upper end of the cylindrical portion and from the lower end of the first region to the lower end of the cylindrical portion, and when the width of the first region is Wp and the total height of the rotating member is H, the relationship of 0 < Wp < 0.5H is satisfied, and the surface of the inner wall surface of the container is formed with protrusions extending in the central axis direction of the container and protruding from the base of the inner wall surface of the container toward the center of the container, and the protrusions are arranged in multiple rows in the circumferential direction of the container.
Preferably, the outer edge shape of the surface of the inner wall of the container in a cross section perpendicular to the central axis of the container is formed to include recesses connecting the convex portions and adjacent convex portions.

Preferably, when an aperture ratio of the plurality of holes penetrating in an inward and outward direction of the first region is P1 and an aperture ratio of the plurality of holes penetrating in an inward and outward direction of the second region is P2, the stirring device has the following properties:
0≦P2/P1<0.5 and P1>0
The above relationship is satisfied.

Furthermore, in the stirring device, it is preferable that the opening area of each of the multiple holes penetrating inward and outward directions of the first region is larger than the opening area of each of the multiple holes penetrating inward and outward directions of the first region, it is preferable that the number of openings of each of the multiple holes penetrating inward and outward directions of the first region is larger than the number of openings of each of the multiple holes penetrating inward and outward directions of the first region, and it is preferable that the penetration paths of each of the multiple holes penetrating inward and outward directions of the first region branch off within the tubular portion.

Furthermore, it is preferable that the rotating member has a horizontal portion inside the cylindrical portion that is perpendicular to the rotation axis of the rotating member, and that the internal space of the cylindrical portion is divided into an upper space and a lower space by the horizontal portion.

It is preferable that the multiple holes penetrating inward and outward through the first region have their penetration paths branched within the tubular portion, with the inward openings of each hole being located in the upper space and the lower space, respectively, and that the multiple holes penetrating inward and outward through the first region are arranged so that holes with their inward openings located in the upper space and holes with their inward openings located in the lower space are alternately aligned in the circumferential direction of the tubular portion.

Generally, in a mixer (thin film swirling mixer) equipped with a container and a rotating member rotating at high speed just inside the container's inner wall, the centrifugal force of the rotating member stirs the material to be mixed, which is present in a film-like state between the rotating member and the inner wall. The material to be mixed is supplied into the container through a supply port located at the bottom of the container, and swirls around the container at high speed along the inner and outer circumferential surfaces of the rotating member's cylindrical portion, which rotates at high speed. The centrifugal force exerted by the rotation of the rotating member causes the material to be mixed inside the cylindrical portion of the rotating member through multiple holes that penetrate the cylindrical portion of the rotating member in both directions, and into the clearance between the container and the rotating member. Furthermore, the material to be mixed supplied into the clearance adheres to the inner surface of the container and swirls in the form of a thin film. As a result, the material to be mixed, which has been supplied between the container and the rotating member and has been formed into a thin film, experiences a difference in swirl speed between the surface of the rotating member and the inner surface of the container, resulting in a shear force that causes it to be mixed.

Here, as described above, when the side surface of the cylindrical portion of the rotating member is composed of a first region that is partitioned in a band shape around the circumferential direction of the cylindrical portion and has a plurality of holes that penetrate inward and outward, and a second region that is partitioned in a band shape around the circumferential direction of the cylindrical portion and has a plurality of holes that penetrate inward and outward such that the aperture ratio of the first region is smaller than that of the first region, the first region is disposed in a portion that includes the center in the height direction of the cylindrical portion, and the second region is disposed from the upper end of the first region to the upper end of the cylindrical portion and from the lower end of the first region to the lower end of the cylindrical portion, and the width of the first region is Wp and the overall height of the rotating member is H,
0<Wp<0.5H
When the above relationship is satisfied, the centrifugal force applied by the rotating member causes the material to be stirred, supplied from inside the cylindrical portion of the rotating member to the clearance, to be concentrated through the holes formed in the first region, which is located in a portion including the center of the cylindrical portion in the height direction, among the multiple holes penetrating the side surface of the cylindrical portion of the rotating member in the inward and outward directions. As a result, in the clearance, the pressure of the material to be stirred present in the portion of the cylindrical portion of the rotating member facing the first region is higher than the pressure of the material to be stirred present in the portion of the cylindrical portion of the rotating member facing the second region, creating a flow in which the material to be stirred rotates and moves from the center of the height direction of the cylindrical portion toward the upper and lower ends of the cylindrical portion. This promotes circulation of the material to be stirred between the inside of the cylindrical portion of the rotating member and the clearance, improving processing efficiency for the material to be stirred. Furthermore, in the clearance section, a difference in rotation speed occurs between the outside of the rotating member and the inner surface of the container, resulting in large friction between the object to be stirred and the inner surface of the container and the rotating member, generating high temperatures. However, as described above, if the circulation of the object to be stirred between the inside of the cylindrical part of the rotating member and the clearance section is promoted, the residence time of the object to be stirred in the clearance section is reduced, and the temperature rise of the object to be stirred is suppressed.
Here, if the surface of the inner wall of the container is formed with multiple protrusions extending in the central axis direction of the container and protruding from the base of the inner wall toward the center of the container in an array around the circumferential direction of the container, the above-mentioned effect is enhanced by a synergistic effect with the rotating member.
Furthermore, if the outer edge shape of the surface of the inner wall of the container in a cross section perpendicular to the central axis of the container is formed to include a convex portion and a concave portion connecting adjacent convex portions, the synergistic effect with the rotating member is particularly enhanced, and the above-mentioned effects are further enhanced.

In addition, in general, in a thin-film swirl-type mixing device, the aperture ratio of the multiple holes penetrating inward and outward through the cylindrical portion of the rotating member affects the shear force applied to the stirring object and the supply rate of the stirring object from the inside of the cylindrical portion of the rotating member to the clearance. Specifically, as the aperture ratio of the multiple holes penetrating inward and outward through the cylindrical portion decreases, the contact area between the cylindrical portion and the stirring object increases, thereby increasing the shear force applied to the stirring object. On the other hand, as the aperture ratio of the multiple holes penetrating inward and outward through the cylindrical portion decreases, the supply rate of the stirring object from the inside of the cylindrical portion of the rotating member to the clearance decreases, whereas as the aperture ratio of the holes increases, the supply rate of the stirring object from the inside of the cylindrical portion of the rotating member to the clearance increases. As described above, there is a trade-off between the shear force applied to the stirring object and the supply rate of the stirring object from the inside of the cylindrical portion of the rotating member to the clearance.

Here, as described above, when the aperture ratio of the plurality of holes in the first region is P1 and the aperture ratio of the plurality of holes in the second region is P2,
0≦P2/P1<0.5 and P1>0
When the second region, which has a small aperture ratio of the multiple holes, is arranged so as to satisfy the relationship, a large shear force can be applied to the stirring target present in the clearance portion opposite the second region, thereby achieving sufficient stirring. Meanwhile, in the second region, the aperture ratio of the multiple holes is small, resulting in a slower supply rate of the stirring target from the inside of the cylindrical portion of the rotating member to the clearance portion. However, as described above, in the clearance portion, the pressure of the stirring target present in the portion of the cylindrical portion of the rotating member facing the first region is higher than the pressure of the stirring target present in the portion of the cylindrical portion facing the second region. This is compensated for by the generation of a flow of stirring target moving from the center of the height of the cylindrical portion toward the upper and lower ends of the cylindrical portion while swirling. In other words, the stirring target supplied to the clearance portion intensively through the holes formed in the first region, which is located in a portion including the center of the height of the cylindrical portion of the rotating member, is supplied to the clearance portion opposite the second region by a flow of stirring target moving toward the upper and lower ends of the cylindrical portion.

In addition, in the agitation device of the present invention, the multiple holes that penetrate the first region of the cylindrical portion of the rotating member in an inward and outward direction have an inward opening area that is larger than the outward opening area of each hole. This promotes the supply of the agitation material from inside the cylindrical portion of the rotating member to the clearance and further increases the pressure of the agitation material in the portion of the clearance that faces the first region of the cylindrical portion of the rotating member. This promotes a flow in which the agitation material moves from the center of the cylindrical portion's height toward the upper and lower ends while swirling. As a result, the circulation of the agitation material between the inside of the cylindrical portion of the rotating member and the clearance is further promoted, further enhancing the effects of improving the processing efficiency of the agitation material, suppressing temperature increases in the agitation material, and applying a large shear force to the agitation material, thereby enabling sufficient agitation processing.

For the multiple holes that penetrate inward and outward through the first region of the cylindrical portion of the rotating member, a method for making the inward opening area of each hole larger than the outward opening area is to make the number of inward openings of each hole larger than the number of outward openings. More specifically, it is preferable to branch the through-paths of each hole within the cylindrical portion of the rotating member.

Furthermore, in the agitation device of the present invention, it is preferable that the rotating member has a horizontal section inside the cylindrical section that is perpendicular to the rotation axis of the rotating member, and that the internal space of the cylindrical section is divided into an upper space and a lower space by the horizontal section. In this way, when the internal space of the cylindrical section is divided into an upper space and a lower space by the horizontal section, the circulation of the agitation target between the inside of the rotating member and the clearance section is more reliably achieved, and the above-mentioned effects of improving the processing efficiency of the agitation target, suppressing temperature increases in the agitation target, and applying a large shear force to the agitation target to enable sufficient agitation processing can be more reliably achieved.

At this time, the plurality of holes penetrating the first region in the inward and outward direction are
(1) The through-paths of the individual holes are branched within the cylindrical portion, and the inward openings of the individual holes are disposed in the upper space and the lower space, respectively; or
(2) The holes whose inward openings are arranged in the upper space and the holes whose inward openings are arranged in the lower space are arranged alternately in the circumferential direction of the cylindrical portion.
With this configuration, the materials to be stirred present in the upper space and the lower space are mixed together when they are supplied intensively to the clearance through the holes formed in the first region. This prevents the circulation of the materials to be stirred between the inside of the cylindrical portion of the rotating member and the clearance from being separated into the upper space and the lower space, and allows the materials to be circulated between the inside of the cylindrical portion of the rotating member and the clearance in a manner that appropriately switches between the materials to be stirred circulating in the upper space and the lower space. This more reliably achieves the effects of improving the processing efficiency of the materials to be stirred, suppressing temperature increases in the materials to be stirred, and applying a large shear force to the materials to be stirred, thereby enabling sufficient stirring.

Other features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

1 is a structural diagram showing a stirring device according to the present invention. 1 is a cross-sectional view showing a stirring device according to the present invention. 1A and 1B are diagrams illustrating a rotating member according to a first embodiment of the present invention. 1 is a schematic diagram showing the flow state of an object to be stirred when the rotating member according to Example 1 of the present invention is used. FIG. 10A and 10B are diagrams illustrating a rotating member according to a second embodiment of the present invention. FIG. 6 is a cross-sectional view showing a rotating member according to a second embodiment of the present invention. 10A and 10B are diagrams illustrating a rotating member according to a third embodiment of the present invention. FIG. 10 is a cross-sectional view showing a rotating member according to a third embodiment of the present invention. 10A and 10B are diagrams illustrating a rotating member according to a fourth embodiment of the present invention. FIG. 10 is a cross-sectional view showing a rotating member according to a fourth embodiment of the present invention. FIG. 10 is a diagram showing a rotating member according to a comparative example. 10 is a schematic diagram showing the flow state of an object to be stirred when a rotating member according to a comparative example is used. FIG. 2 is a schematic diagram showing the surface structure of the inner wall surface of a container used in the agitation device according to the present invention. FIG. 2 is a schematic diagram showing the surface structure of the inner wall surface of a container used in the agitation device according to the present invention. FIG. FIG. 10 is a schematic diagram showing a clearance portion of a stirring device according to a sixth embodiment of the present invention. FIG. 10 is a schematic diagram showing a clearance portion of a stirring device according to a sixth embodiment of the present invention.

A preferred embodiment of the present invention will now be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, the agitator 1 comprises a cylindrical container 2; an outer layer 4 to which a water-cooling pipe 6 for supplying and discharging cooling water is connected to the outer peripheral surface, including the bottom surface, of the container 2; a rotating member 800 (810, 820, 830) that is concentric with the container 2 and can rotate at high speed with a small gap s between it and the inner surface 22 of the container 2; a shaft 10 that supports the rotating member 800 at its end and can be rotated forward and backward at high speed; an upper container 14 that is attached to the top of the container 2 via a dam plate 12 and has a discharge pipe 13 for discharging the product; and a lid 16 that seals the upper container 14. Supply pipes 17 and 18 for supplying raw materials are attached to the bottom of the container 2 via valves 19 and 20. For convenience, FIGS. 1 and 2 omit the multiple holes, lids, valves, etc. that penetrate the cylindrical portion (described below) of the rotating member 800 in the inward and outward directions. As shown in Figure 2, if the inner diameter of the container 2 is D and the outer diameter of the cylindrical portion is φ, then the gap s = (D - φ)/2.

As shown in Figure 2, the upper vessel 14 is provided with a cooling water chamber 15 around its periphery, to which cooling water is supplied. The dam plate 12 has an opening 11 so that the liquid to be treated (the liquid to be stirred) can be discharged from the outlet pipe 13.

The rotating member 800 is also designed to be driven at a high peripheral speed of 10 to 50 m/sec. Furthermore, the agitator 1 can be made vacuum-evacuumable by airtightly sealing the container 2, upper container 14, lid 16, and shaft 10 with gaskets and providing a vacuum exhaust device via a valve. From the perspective of more effectively achieving the effects of the present invention, the rotating member 800 is preferably driven at a high peripheral speed of 20 to 50 m/sec, more preferably 25 to 50 m/sec, and even more preferably 30 to 50 m/sec.

Next, the operation of the high-speed agitator according to this embodiment will be described. Referring to Figure 2, first, a barrier plate 12 is installed to seal the container 2 in order to set the conditions for the liquid to be treated. Next, a predetermined amount of the liquid to be treated L is introduced into the container 2 through the supply pipes 17 and 18. Next, the shaft 10 connected to a motor (not shown) is driven to rotate at high speed, causing the rotating member 800 to rotate at high speed.

At this time, the liquid to be treated L is forced to rotate in the circumferential direction by the high-speed rotation of the rotating member 800. The centrifugal force generated by this rotation causes the liquid to swirl around the inner surface of the container 2 in the form of a thin cylindrical film (including cases where some parts are not cylindrical) with a thickness t (average thickness). Furthermore, after stirring, the liquid to be treated L flows continuously over the weir plate 12 into the upper container 14 and is discharged out of the container 2 through the outflow pipe 13.

Next, we will explain in detail the rotating members used in the agitator of the present invention and the agitator of the comparative example.

Example 1
FIG. 3 shows a rotating member 800 according to a first embodiment. FIG. 3( a) is a cross-sectional view of the rotating member 800, taken along line A-A in FIG. 3( b). FIG. 3( b) is a top view of the rotating member 800. FIG. 3( c) is a side view of the rotating member 800. As shown in FIG. 3, the rotating member 800 has a cylindrical portion 801. A first region 803 is provided on the side surface of the cylindrical portion 801, as shown by the dashed-dotted line in FIG. 3( c). The first region 803 is defined in a band shape in the circumferential direction of the cylindrical portion 801, and has a plurality of holes 802 penetrating the cylindrical portion 801 in the inward and outward directions. The first region 803 is also provided so as to include the center of the cylindrical portion 801 in the height direction. The upper end of the first region 803 is defined by an upper tangent to the opening edges of the plurality of holes 802 arranged on the side surface of the cylindrical portion 801 (the upper dashed line in FIG. 3( c)), while the lower end of the first region 803 is defined by a lower tangent to the opening edges of the plurality of holes 802 arranged on the side surface of the cylindrical portion 801 (the lower dashed line in FIG. 3( c)). The width Wp of the first region 803 is defined by the distance between the upper tangent and the lower tangent to the opening edges of the plurality of holes 802. Within the first region 803, the distance between adjacent holes 802 and the distance between rows in which the plurality of holes 802 are arranged are uniform. Furthermore, although this embodiment shows an example in which the plurality of holes 802 are arranged in a single row within the first region 803, two or more rows are also acceptable as necessary. In this case, the upper end of the first region 803 is defined by the upper tangent to the opening edge of the top row of the multiple holes 802, while the lower end of the first region 803 is defined by the lower tangent to the opening edge of the bottom row of the multiple holes 802.

As shown in Fig. 3(c), a second region 804 is arranged on the side surface of the cylindrical portion 801, from the upper end (upper tangent) of the first region 803 to the upper end of the side surface of the cylindrical portion 801, and from the lower end (lower tangent) of the first region 803 to the lower end of the side surface of the cylindrical portion 801. In the second region 804, a plurality of holes 802 penetrating inward and outward directions are formed so that the aperture ratio of the plurality of holes 802 is smaller than the aperture ratio of the first region 803, and in the example shown in Fig. 3, there are no apertures (aperture ratio = 0), but this is not limiting. The aperture ratio P is
P = S1/S2
S1: the sum of the opening areas of the plurality of holes in the target region (first region or second region) S2: the sum of the areas of the target region (first region or second region) In this embodiment, the opening ratios P of the upper and lower second regions 804 are set to be the same, but they may be different as necessary.

The width Wn of the second region 804 is determined by the sum (Wn=Wn1+Wn2) of the width Wn1 from the upper end of the first region 803 (the tangent to the upper side of the opening edges of the plurality of holes 802) to the upper end of the side surface of the cylindrical portion 801, and the width Wn2 from the lower end of the first region 803 (the tangent to the lower side of the opening edges of the plurality of holes 802) to the lower end of the side surface of the cylindrical portion 801. The overall height H of the rotating member is determined by the height of the side surface of the cylindrical portion 801,
H = Wp + Wn
Satisfy the relationship.

Here, the width Wp of the first region is
0<Wp<0.5H
In this embodiment, the widths Wn1 and Wn2 of the upper and lower second regions 804 are set to be the same, but they may be different as necessary.

With the above-described configuration of the rotating member 800, the centrifugal force applied by the rotating member 800 causes the material to be stirred, supplied from the inside of the cylindrical portion 801 of the rotating member 800 to the clearance portion (see paragraph 0012), to be concentrated through the holes 802 formed in the first region 803, which is located in a portion including the center of the cylindrical portion 801 in the height direction, among the multiple holes 802 in the cylindrical portion 801 of the rotating member 800. As a result, in the clearance portion, the pressure of the material to be stirred present in the portion facing the first region 803 of the cylindrical portion 801 is higher than the pressure of the material to be stirred present in the portion facing the second region 804. As a result, the material to be stirred rotates and generates a flow moving from the center of the cylindrical portion 801 in the height direction toward the upper and lower ends of the cylindrical portion 801, as shown in FIG. 4. This promotes circulation of the material to be stirred between the inside of the rotating member 800 and the clearance portion shown in FIG. 4, improving processing efficiency for the material to be stirred.

Generally, in the clearance section, a difference in the rotational speed of the object to be stirred occurs between the rotating member 800 side and the inner surface of the container 2, resulting in significant friction between the object to be stirred and the rotating member 800 and the inner surface of the container 2, generating high temperatures. Therefore, when the circulation of the object to be stirred between the inside of the cylindrical portion 801 of the rotating member 800 and the clearance section is promoted as described above, the residence time of the object to be stirred in the clearance section is reduced, and a flow is created in which the relatively high-temperature object to be stirred Fh and the relatively low-temperature object to be stirred Fl alternate, as shown in Figure 4, thereby suppressing the temperature rise of the object to be stirred.

The width Wp of the first region is
Preferably, 0<Wp<0.3H
More preferably, 0<Wp<0.2H
More preferably, 0<Wp<0.1H
When the relationship between the width Wp and the clearance portion is satisfied, the effect of improving the processing efficiency of the object to be stirred and the effect of suppressing the temperature rise of the object to be stirred are further enhanced. On the other hand, if the width Wp of the first region is excessively small, the supply of the object to be stirred from the holes 802 formed in the first region 803 to the clearance portion is hindered. Therefore, the width Wp of the first region is set to:
Preferably, Wp>0.01H
More preferably, Wp>0.02H
More preferably, Wp>0.03H
It is desirable to satisfy the following relationship.

In general, in a thin film swirl-type stirring device, the aperture ratio P of the plurality of holes 802 formed in the cylindrical portion 801 affects the shear force applied to the stirring object and the supply rate of the stirring object from the inside of the rotating member to the clearance portion. Specifically, as the aperture ratio P of the plurality of holes 802 formed in the cylindrical portion 801 decreases, the contact area between the cylindrical portion 802 and the stirring object increases, thereby increasing the shear force applied to the stirring object. On the other hand, as the aperture ratio P of the plurality of holes 802 formed in the cylindrical portion 801 decreases, the supply rate of the stirring object from the inside of the cylindrical portion 801 of the rotating member 800 to the clearance portion decreases, whereas as the aperture ratio P of the holes increases, the supply rate of the stirring object decreases. As described above, there is a trade-off between the shear force applied to the object to be stirred and the speed at which the object to be stirred is supplied from the inside of the cylindrical portion 801 of the rotating member 800 to the clearance portion. Therefore, in this embodiment, when the aperture ratio of the plurality of holes 802 in the first region 803 is P1 and the aperture ratio of the plurality of holes 802 in the second region 804 is P2,
0≦P2/P1<0.5 and P1>0
In this way, by arranging the second region 804 having a small opening ratio of the plurality of holes 802, a large shear force can be applied to the stirring object present in the clearance portion facing the second region 804, thereby enabling sufficient stirring processing.

On the other hand, in the second region 804, the aperture ratio of the multiple holes 802 is small, resulting in a slower supply rate of the agitation material from the inside of the cylindrical portion 801 of the rotating member 800 to the clearance. However, as described above, in the clearance, the pressure of the agitation material present in the portion of the cylindrical portion 801 of the rotating member 800 facing the first region 803 is higher than the pressure of the agitation material present in the portion facing the second region 804. As the agitation material rotates, flows are generated that move from the center of the height of the cylindrical portion 801 toward the upper and lower ends of the cylindrical portion 801, as shown in FIG. 4. In other words, the agitation material that is supplied intensively to the clearance from the holes 802 formed in the first region 803, which is located in a portion including the center of the height of the cylindrical portion 801 of the rotating member 800, are supplied to the clearance portion facing the second region 804 by flows that move toward the upper and lower ends of the cylindrical portion 801. This compensates for this.

Furthermore, in this embodiment, the multiple holes 802 penetrating the first region 803 of the cylindrical portion 801 of the rotating member 800 inward and outward directions have an opening area inward that is larger than the opening area outward (see FIG. 3( a) ). This promotes the supply of the stirring target from the inside of the cylindrical portion 801 of the rotating member 800 to the clearance portion, thereby further increasing the pressure of the stirring target present in the portion of the clearance portion facing the first region 803 of the cylindrical portion 801 of the rotating member 800. This promotes the flow of the stirring target as it swirls from the center of the cylindrical portion 801 in the height direction toward the upper and lower ends of the cylindrical portion. As a result, the circulation of the stirring target between the inside of the cylindrical portion 801 of the rotating member 800 and the clearance portion is further promoted, thereby further enhancing the effects of improving the processing efficiency of the stirring target, suppressing the temperature rise of the stirring target, and applying a large shear force to the stirring target to perform sufficient stirring processing. In order to further enhance the effects of the present invention, the aperture ratio of the plurality of holes 802 in the first region 803 and the second region 804 is set to:
Preferably, 0≦P2/P1<0.25 and P1>0
More preferably, 0≦P2/P1<0.1 and P1>0
More preferably, 0≦P2/P1<0.05 and P1>0
It is desirable to set it so that the following relationship is satisfied.

For the multiple holes 802 that penetrate inward and outward through the first region 803 of the rotating member 800, the inward opening area of each hole is made larger than the outward opening area. In this embodiment, the number of inward openings of each hole is made larger than the number of outward openings. Specifically, the through-paths 805 of each hole branch off inside the cylindrical portion 801, so that the number of inward openings is two and the number of outward openings is one.

In this embodiment, the rotating member 800 has a horizontal portion 806 inside the cylindrical portion 801 that is perpendicular to the rotation axis of the rotating member 800, and the internal space of the cylindrical portion 801 is divided into an upper space 807 and a lower space 808 by the horizontal portion 806. As described above, when the internal space of the cylindrical portion 801 is divided into an upper space and a lower space by the horizontal portion 806, the circulation of the agitation target between the inside of the cylindrical portion 801 of the rotating member 800 and the clearance portion is more reliably achieved, thereby more reliably achieving the effects of improving the processing efficiency of the agitation target, suppressing temperature increases in the agitation target, and applying a large shear force to the agitation target to perform sufficient agitation processing. It is preferable that the division of the upper space 807 and the lower space 808 by the horizontal portion 806 isolates the upper space 807 from the lower space 808, blocking the flow of the agitation target via the horizontal portion 806. In the illustrated example, the horizontal portion 806 includes a boss 28 that abuts against the shaft 10.

In this embodiment, the inward openings of the multiple holes 802 penetrating the first region 803 inward and outward directions are respectively arranged in the upper space 807 and the lower space 808, and an opening through-path 805 connecting these two inward openings and one outward opening is connected inside the cylindrical portion 801. Therefore, the stirring objects present in the upper space and the lower space can be mixed together when supplied to the clearance portion from the holes formed in the first region. This prevents the stirring object from circulating between the inside of the cylindrical portion 801 of the rotating member 800 and the clearance portion in a manner that is separated between the upper space 807 side and the lower space 808 side. Furthermore, the stirring object can be circulated between the inside of the rotating member and the clearance portion in a manner that appropriately switches between the stirring object circulating between the upper space 807 and the lower space 808. As a result, the above-mentioned effects of improving the processing efficiency of the object to be stirred, suppressing the temperature rise of the object to be stirred, and applying a large shear force to the object to be stirred to perform sufficient stirring processing can be more reliably achieved.
Furthermore, Figure 13 shows the structure of the surface of the inner wall of the container 2 in Example 1, where Figure 13(a) is an enlarged schematic diagram of the surface of the inner wall of the container 2 as viewed from the front, and Figure 13(b) is an enlarged schematic diagram of a cross section perpendicular to the central axis of the container 2 (direction T in the figure).
As shown in FIG. 13( a ), the protrusion 900 is formed to extend in the central axis direction of the container.
As shown in FIG. 13B, the convex portion 900 is formed so as to protrude from a base portion 901 on the inner wall surface of the container 2 toward the center of the container 2 (direction C in the figure).
13(b), arc-shaped recesses 902 are formed between adjacent convex portions 900. The recesses 902 are formed so that the inner circumferential surface thereof recedes from the center of the container 2 toward the base 901. As a result, the outer edge shape of the surface of the inner wall surface of the container 2 is formed to include the arc-shaped recesses 902 that connect the convex portions 900 and adjacent convex portions 900. This further enhances the effect of the rotating member 800 described above, and it can be said that a synergistic effect between the rotating member 800, the convex portions 900, and the recesses 902 is effectively achieved.
13C, the tip of the convex portion 900 may be flat, or although not shown, the tip of the convex portion 900 may have a rounded (R) shape. However, from the viewpoint of more reliably achieving the effects of the present invention, it is preferable that the tip of the convex portion 900 be sharp.
13B and 13C show an example in which the recess 902 is configured as an arc (curve), but instead, the recess 902 may be configured as a rectangular line or a bent line (straight line), or may be configured as a mixture of these curved and straight lines. However, from the viewpoint of more effectively exhibiting the effects of the present invention, it is preferable that the recess 902 be configured as an arc (curve).
As shown in FIGS. 13( a ), ( b ), and ( c ), a plurality of convex portions 900 and concave portions 902 are formed in an array in the circumferential direction of the container 2 .
In this embodiment, an example has been shown in which the convex portions 900 are formed extending over almost the entire height of the inner wall surface of the container 2 in the direction of the central axis of the container 2 (direction T in the figure). However, as shown in Figure 14(a), the phase in which the convex portions 900 are arranged may be changed at the upper and lower parts of the inner wall surface, or as shown in Figure 14(b), it is also possible to form no convex portions 900 at either the upper or lower parts of the inner wall surface, or both.
Furthermore, although not shown, the portion of the inner wall surface of the container 2 where the convex portion 900 is not formed is not limited to either the upper or lower portion, but can also be formed between the upper and lower portions, and the convex portion 900 can also be formed so as to be divided into two or more regions in the direction of the central axis of the container 2.
In addition, in this embodiment, an example has been shown in which the protrusions 900 are formed so as to extend parallel to the central axis direction of the container (direction T in the figure), but this is not limited thereto, and the protrusions may be formed so as to extend at an angle relative to the central axis direction of the container, as shown in Figures 14(c) and 14(d). Therefore, the phrase "extending with respect to the central axis direction of the container" in this application includes not only cases in which the protrusions are extended parallel to the central axis direction of the container (direction T in the figure), but also cases in which the protrusions are extended at an angle relative to the central axis direction of the container.
The synergistic effect of the rotating member 800, the convex portion 900, and the concave portion 902 described above also applies to the following embodiments.

Example 2
FIG. 5 shows a rotating member 810 of Example 2. FIG. 5(a) is a cross-sectional view of the rotating member 810, showing the cross section taken along line A-A in FIG. 5(b). FIG. 5(b) is a top view of the rotating member 810. FIG. 5(c) is a side view of the rotating member 810. FIG. 6 is a cross-sectional view of the rotating member 810, showing the cross section taken along line B-B in FIG. 5(b).

The rotating member 810 is the same as the rotating member 800 of Example 1, except that the structure and arrangement of the multiple holes 802 that penetrate the first region 803 in the inward and outward directions differ from those of the rotating member 800 of Example 1. Specifically, in the rotating member 810, the inward openings of the multiple holes 802 are arranged in the upper space 807 and the lower space 808, respectively, but the through-paths 805 are not connected inside the tubular portion 801, and the inward openings and outward openings are connected one-to-one. Furthermore, the inward openings of the multiple holes 802 are arranged so as to open obliquely on the inclined portion 811 of the tubular portion 801, which makes the inward opening area of each hole 802 larger than the outward opening area. Furthermore, as shown in Figure 5(c), the multiple holes 802 penetrating inward and outward directions are arranged so that holes with inward openings located in the upper space 807 and holes with inward openings located in the lower space 808 are alternately aligned in the circumferential direction of the cylindrical portion 801. This configuration achieves the aforementioned effects of improving the processing efficiency of the stirring object, suppressing temperature increases in the stirring object, and applying a large shear force to the stirring object to perform sufficient stirring processing.

Example 3
FIG. 7 shows a rotating member 820 of Example 3. FIG. 7(a) is a cross-sectional view of the rotating member 820, showing the cross section taken along line A-A in FIG. 7(b). FIG. 7(b) is a top view of the rotating member 820. FIG. 7(c) is a side view of the rotating member 820. FIG. 8 is a cross-sectional view of the rotating member 820, showing the cross section taken along line B-B in FIG. 7(b).

The rotating member 820 is the same as the rotating member 810 of Example 2, except that the structure and arrangement of the multiple holes 802 penetrating inward and outward through the first region 803 differ from those of the rotating member 810 of Example 2. Specifically, through-paths 805 connecting the inward openings and outward openings of the multiple holes 802 penetrate obliquely through the tubular portion 801. As shown in FIG. 7(c), the multiple holes 802 penetrating inward and outward are arranged such that holes with inward openings located in the upper space 807 and holes with inward openings located in the lower space 808 are alternately aligned on the same line in the circumferential direction of the tubular portion 801. This configuration achieves the aforementioned effects of improving the processing efficiency of the stirring object, suppressing temperature increases in the stirring object, and applying a large shear force to the stirring object to perform sufficient stirring processing.

Example 4
FIG. 9 shows a rotating member 830 of Example 4. FIG. 9(a) is a cross-sectional view of the rotating member 830, showing the cross section taken along line A-A in FIG. 9(b). FIG. 9(b) is a top view of the rotating member 830. FIG. 9(c) is a side view of the rotating member 830. Example 4 is an agitation device that includes a container and a rotating member that rotates at high speed slightly inside the inner wall surface of the container, and uses the centrifugal force of the rotating member to agitate an object to be agitated that is present in a film-like form between the rotating member and the inner wall surface. The rotating member has a cylindrical portion that is positioned with a small gap between it and the inner wall surface of the container, and has a horizontal portion inside the cylindrical portion that is perpendicular to the rotation axis of the rotating member. The internal space of the cylindrical portion is divided into an upper space and a lower space by the horizontal portion. The side surface of the cylindrical portion facing the upper space and the side surface facing the lower space are each divided into bands in the circumferential direction of the cylindrical portion, and have a through hole penetrating inward and outward. and a second region that is partitioned in a band shape around the circumference of the cylindrical portion and has a plurality of holes that penetrate inward and outward directions and are formed so that the opening rate of the first region is smaller than that of the first region, or is non-porous; the first region is arranged on the horizontal side of the side of the upper space and the side of the lower space of the cylindrical portion, respectively; the second region is arranged from the upper end of the first region on the side of the upper space of the cylindrical portion to the upper end of the cylindrical portion and from the lower end of the first region on the side of the lower space of the cylindrical portion to the lower end of the cylindrical portion, respectively; and the plurality of holes formed in the first region are arranged in three or fewer rows around the circumference of the cylindrical portion.

Figure 10 is a cross-sectional view of the rotating member 830, showing the cross section taken along line B-B in Figure 9(b). As shown in Figure 9, the rotating member 830 has a cylindrical portion 801, and inside the cylindrical portion 801 is a horizontal portion 806 that is perpendicular to the rotation axis of the rotating member 830. The internal space of the cylindrical portion 801 is divided into an upper space 807 and a lower space 808 by the horizontal portion 806. The side surface of the cylindrical portion 801 of the rotating member 830 is provided with a first region 803, as shown by the dashed-dotted line in Figure 9(c), which is divided into a band-like shape in the circumferential direction of the cylindrical portion and has multiple holes 802 that penetrate the cylindrical portion 801 in both the inward and outward directions. The first region 803 is located on the horizontal portion side of the side surface of the upper space 807 and the side surface of the lower space 808 of the cylindrical portion 801 (towards the center in the height direction of the cylindrical portion 801).

The upper end of the first region 803 on the side surface of the upper space 807 of the cylindrical portion 801 is defined by the upper tangent to the opening edges of the multiple holes 802 arranged on the side surface of the cylindrical portion 801 (upper dashed dotted line in Figure 9(c)), while the lower end of the first region 803 is defined by a height position (lower dashed dotted line in Figure 9(c)) based on the surface of the horizontal portion 806 facing the upper space 807. The width Wp1 of the first region 803 on the side surface of the upper space 807 of the cylindrical portion 801 is defined by the distance between the upper tangent to the opening edges of the multiple holes 802 and a height position based on the surface of the horizontal portion 806 facing the upper space 807. Within the first region 803, the distance between adjacent multiple holes 802 and the distance between rows of the multiple holes 802 are uniform.

The lower end of the first region 803 on the side surface of the lower space 808 of the cylindrical portion 801 is defined by a line tangent to the lower opening edges of the multiple holes 802 arranged on the side surface of the cylindrical portion 801 (the lower dashed line in Figure 9(c)), while the upper end of the first region 803 is defined by a height position (the upper dashed line in Figure 9(c)) based on the surface of the horizontal portion 806 facing the lower space 808. The width Wp2 of the first region 803 on the side surface of the lower space 808 of the cylindrical portion 801 is defined by the distance between the upper tangent to the opening edges of the multiple holes 802 and a height position based on the surface of the horizontal portion 806 facing the lower space 807. Within the first region 803, the distance between adjacent multiple holes 802 and the distance between rows of multiple holes 802 are uniform. In this embodiment, the widths Wp1 and Wp2 of the first region 803 on the side surface of the upper space 807 and the side surface of the lower space 808 of the cylindrical portion 801 are set to be the same, but they can be made different as necessary. Also, in this embodiment, an example is shown in which the holes 802 are arranged in a single row within the first region 803, but two or more rows can be arranged as necessary. In this case, the upper end of the first region 803 is defined by the upper tangent to the opening edge of the top row of the holes 802, while the lower end of the first region 803 is defined by the lower tangent to the opening edge of the bottom row of the holes 802.

As shown in Fig. 9(c), second regions 804 are arranged on the side surface of the cylindrical portion 801, from the upper end of the first region 803 on the side surface of the upper space 807 to the upper end of the side surface of the cylindrical portion 801, and from the lower end of the first region 803 on the side surface of the lower space 808 to the lower end of the side surface of the cylindrical portion 801. In the second region 804, a plurality of holes 802 are formed so that the aperture ratio of the plurality of holes 802 penetrating inward and outward directions is smaller than the aperture ratio of the first hole formation region 803, and in the example shown in Fig. 3, there are no apertures (aperture ratio = 0), but this is not limited to this. The aperture ratio P is expressed as
P = S1/S2
S1: Sum of the opening areas of the multiple holes in the target region (first region or second region) S2: Sum of the area of the target region (first region or second region) In this embodiment, the opening ratios P of the first region 803 and the second region 804 on the side surface of the upper space 807 and the side surface of the lower space 808 of the cylindrical portion 801 are set to be the same, but they may be different as necessary.

The width of the second region 804 is determined by the width Wn1 from the upper end of the first region 803 (the upper tangent to the opening edge of the top row of holes 802) on the side surface of the upper space 807 to the upper end of the side surface of the tubular portion 801, or the width Wn2 from the lower end of the first region 803 (the lower tangent to the opening edge of the bottom row of holes 802) on the side surface of the lower space 808 to the lower end of the side surface of the tubular portion 801. Note that in this embodiment, the widths Wn1 and Wn2 of the second region 804 on the side surface of the upper space 807 and the side surface of the lower space 808 of the tubular portion 801 are set to the same, but they may be different as needed. Also, in this embodiment, an example is shown in which the multiple holes 802 are arranged in a single row within each first region 803. However, two or more rows may be arranged as needed, and an arrangement in three or fewer rows is sufficient. Preferably, the multiple holes formed in the first region 803 are arranged in two or fewer rows in the circumferential direction of the cylindrical portion 801, and more preferably in one row.

Example 5
When various types of stirring objects were treated using the stirring apparatus 1 of Examples 1 to 4, it was confirmed that the stirring apparatus 1 of the present invention is suitable for stirring objects including any of metal oxides (titanium oxide, aluminum oxide, zinc oxide, iron oxide, nickel oxide, yttrium oxide, iridium oxide, silver oxide, zirconium oxide, lanthanum oxide, lead oxide, cesium oxide, cerium oxide, chromium oxide, cobalt oxide, copper oxide, calcium oxide, tin oxide, and bismuth oxide), viscous compounds, platinum-supported carbon, platinum alloy-supported carbon, carbon nanotubes, metal powders (gold, silver, copper, nickel, tin, zinc, aluminum, bismuth, and antimony), mica, cellulose nanofibers, carbon black, graphene, and graphite.

In addition to the above-mentioned materials, it has been confirmed that the stirring device 1 of the present invention is also suitable for stirring objects containing LiB active materials. For example,
a positive _electrode active material having an olivine structure and represented by the composition formula LiFe1 _{- xMxPO4} : (wherein M is at least one element selected from the group consisting of Ni, Co, Mn, Ti, Zr, and Mo, and x satisfies 0≦x<1), the surface of which is coated with carbon;
Primarily, lithium salts of transition metal oxides are used, and for example, layered rock salt type and spinel type lithium-containing metal oxides can be used as the positive electrode active material.
Specific examples of layered rock salt type positive electrode active materials include lithium cobaltate, lithium nickelate, and ternary compounds called NCM {Li(Ni _x , Co _y , Mn _z ), x + y + z = 1} and NCA {Li(Ni _1-ab Co _a Al _b )}. Spinel type positive electrode active materials include lithium manganate.

Also,
It has been confirmed that the stirring device 1 of the present invention is also suitable for stirring objects containing a NASICON-type oxide solid electrolyte, lithium titanium aluminum phosphate Li _1+x Al _x Ti _2-x (PO ₄ ) ₃ (LATP) electrolyte.

In addition to the above substances,
It has been confirmed that the stirring device 1 of the present invention is also suitable for stirring objects containing any of the following: lithium titanate, x-Li3PS4 (LPS) electrolyte, Si (silicon), nanosilicon, SiO (silicon monoxide), SiO2 (silica (silicon dioxide)), silver iodide, aluminum diboride, aluminum hydroxide, aluminum nitride, barium molybdate, barium nitride, barium sulfate, barium titanate, beryllium carbide, beryllium nitride, calcium aluminate, calcium oxide, diferric iron trisulfide, lead acetate, lead carbonate, liposomes, magnesium aluminate, magnesium hydroxide, cesium fluoride, cerium fluoride, copper sulfide, silver bromide, potassium bromide, potassium carbonate, trilithium phosphate, and sulfur.

It has also been confirmed that the stirring device 1 of the present invention is suitable not only for stirring objects containing any one of the above substances alone, but also for stirring objects containing a mixture of two or more of the above substances.

For stirring objects containing any one of the above substances alone and objects containing a mixture of two or more of the above substances, it is suitable even if the convex portions 900 and concave portions 902 are not formed on the inner wall surface of the container 2 in the stirring device 1 of the present invention, but it is preferable that the convex portions 900 and concave portions 902 are formed on the inner wall surface of the container 2 as in the stirring device 1 of the present invention, as this makes it more suitable.

Example 6
The outer diameters of the rotating members 800, 810, 820, and 830 used in the agitation device 1 of Examples 1 to 4 can be changed continuously or stepwise in either height direction, as shown in Figures 15(a) to 15(b), so that the distances (clearance portions) between the inner wall surfaces (side surfaces) of the container 2 and the rotating members 800, 810, 820, and 830 can be changed continuously or stepwise.
Figures 15(a) to (b) show an embodiment in which the spacing of the clearance portions in the center of the height direction of the rotating members 800, 810, 820, and 830 is narrowed, but the spacing of the clearance portions in the center can also be wider than the spacing of the other clearance portions.
In addition, although Figures 15(a) and (b) show a mode in which the spacing of the clearance portion changes linearly, it is also possible to change it in a curved manner, or to change the spacing of the clearance portion by combining a straight line and a curved line.
In addition, the inner diameter of the inner wall surface of the container 2 used in the agitator 1 of Examples 1 to 4 can be changed continuously or stepwise in either height direction as shown in Figures 15(c) to 15(d), thereby changing the clearance portion continuously or stepwise.
Figures 15(c) to (d) show an embodiment in which the spacing of the clearance portions in the center of the height direction of the rotating members 800, 810, 820, and 830 is narrowed, but the spacing of the clearance portions in the center can also be wider than the spacing of the other clearance portions.
In addition, although Figures 15(c) to (d) show a state in which the spacing of the clearance portion changes linearly, it is also possible to change it in a curved manner, or to change the spacing of the clearance portion by combining straight lines and curved lines.
Furthermore, the outer diameters of the rotating members 800, 810, 820, and 830 used in the agitation devices 1 of Examples 1 to 4, and the inner diameter of the inner wall surface of the container 2 used in the agitation devices 1 of Examples 1 to 4 can both be changed continuously or stepwise in either height direction. In this case, in addition to a configuration in which the clearance portion is changed continuously or stepwise, it is also possible to keep the spacing of the clearance portion substantially constant without changing it, and to displace the clearance portion in the radial direction of the container 2 or tilt it with respect to the central axis direction of the container, as shown in Figures 16(a) and 16(b).
Figures 16(a) to (b) show a configuration in which the clearance portions at the center of the height direction of the rotating members 800, 810, 820, and 830 are located radially outward of the container 2 relative to the other clearance portions, but it is also possible to position the clearance portions at the center radially inward of the container 2 relative to the other clearance portions.

The relationship between the positions of the first region 803 and the second region 804, in which multiple holes 802 penetrating inward and outward directions of the cylindrical portion 801 of the rotating members 800, 810, 820, and 830 are formed, and the narrowness/wideness of the clearance portion is not particularly limited, but if the first region 803 is positioned opposite the narrowest or widest region of the clearance portion, optimal processing can be performed according to the properties of the substance contained in the object to be stirred, and the effect of the present invention can be further enhanced.

Furthermore, the relationship between the positions of the convex portions 900 and concave portions 902 on the inner wall surface of the container 2 and the narrowness/wideness of the clearance portion is not particularly limited, but if the convex portions 900 and concave portions 902 on the inner wall surface of the container 2 are arranged so as to face the narrowest and widest regions of the clearance portion, optimal processing can be performed according to the properties of the substance contained in the object to be stirred, which is preferable in that the effects of the present invention can be further enhanced.

Furthermore, the relationship between the positions of the first region 803 and the second region 804, in which multiple holes 802 penetrating inward and outward directions of the cylindrical portion 801 of the rotating members 800, 810, 820, and 830, the positions of the convex portions 900 and the concave portions 902 on the inner wall surface of the container 2, and the narrowness/wideness of the clearance portion is not particularly limited, but if the convex portions 900 and the concave portions 902 on the first region 803 and the inner wall surface of the container 2 are arranged so as to face the narrowest and widest regions of the clearance portion, respectively, optimal processing can be performed according to the properties of the substance contained in the object to be stirred, and the effects of the present invention can be further enhanced, which is preferable.

(Comparative Example)
FIG. 11 shows a comparative example of a rotating member 8. FIG. 11(a) is a cross-sectional view of the rotating member 8, showing the cross-section taken along line A-A in FIG. 11(b). FIG. 11(b) is a top view of the rotating member 8. FIG. 11(c) is a side view of the rotating member 8. In the rotating member 8, the side surface of the cylindrical portion 24 of the rotating member 8 is not divided into a first region and a second hole-forming region. Instead, a plurality of holes 30 are formed penetrating inward and outward along almost the entire side surface of the cylindrical portion 24, except for a portion including the center of the cylindrical portion 24 in the height direction. Furthermore, the rotating member 8 has a through-hole 32 formed in the horizontal portion 26, connecting the upper space 81 and the lower space 82. Note that this comparative example is not prior art relative to the present invention.

When using the rotating member 8, the material to be stirred is supplied to the clearance from inside the cylindrical portion 24 of the rotating member 8 relatively evenly through multiple holes 30 that penetrate inward and outward along almost the entire side surface of the cylindrical portion 24. For this reason, in this comparative example, the flow of the material to be stirred, which moves from the center of the cylindrical portion's height toward the upper and lower ends while swirling as in the example, is not promoted, and turbulence occurs in the clearance as shown in Figure 12. As a result, this comparative example is unable to fully achieve the effects of improving the processing efficiency of the material to be stirred, suppressing temperature increases in the material to be stirred, and applying a large shear force to the material to achieve sufficient stirring.

The stirring device according to the present invention is not limited to the above-described embodiment, and the specific configuration of each part of the stirring device according to the present invention can be freely designed and modified in various ways.

1 Stirring device 2 Container 4 Outer layer 6 Water-cooled piping 8, 800, 810, 820 Rotating member 10 Shaft 12 Diaphragm 13 Discharge pipe 14 Upper container 16 Lid 17, 18 Supply pipe 19, 20 Valve 22 Container inner surface 24, 801 Cylindrical portion 26, 806 Horizontal portion 28 Boss 30 Small hole 32 Through hole 81, 807 Upper space 82, 808 Lower space 803 First region 804 Second region 805 Through path 811 Inclined portion

Claims (9)

A stirring device comprising a container and a rotating member that rotates at high speed slightly inside the inner wall surface of the container, and stirs a stirring object that exists in a film-like state between the rotating member and the inner wall surface by centrifugal force of the rotating member,
The rotating member is
a cylindrical portion positioned with a small gap between it and the inner wall surface of the container;
The side surface of the cylindrical portion is
a first region that is partitioned in a band shape in the circumferential direction of the cylindrical portion and has a plurality of holes that penetrate inward and outward;
a second region that is partitioned in a band shape in the circumferential direction of the cylindrical portion, and has a plurality of holes that penetrate inward and outward directions and have an opening ratio smaller than that of the first region, or is non-hole-containing,
the first region is disposed in a portion including the center in the height direction of the cylindrical portion,
the second region is disposed from an upper end of the first region to an upper end of the cylindrical portion and from a lower end of the first region to a lower end of the cylindrical portion,
When the width from the upper end to the lower end of the first region is Wp and the total height of the cylindrical portion is H,
0<Wp<0.5H
Fulfilling the relationship,
The surface of the inner wall of the container is
The container is formed to extend in the central axis direction thereof, and
A convex portion protruding from the base of the inner wall surface of the container toward the center of the container,
A stirring device characterized in that a plurality of the stirring members are arranged in the circumferential direction of the container. The outer edge shape of the surface of the inner wall surface of the container in a cross section perpendicular to the central axis of the container is
2. The stirring device according to claim 1, wherein the stirring device is formed to include recesses that connect the convex portions and adjacent convex portions. When the aperture ratio of the first region is P1 and the aperture ratio of the second region is P2,
0≦P2/P1<0.5 and P1>0
2. The stirring device according to claim 1, wherein the following relationship is satisfied: The stirring device described in claim 1, characterized in that the opening area of each of the multiple holes penetrating the first region in the inward and outward directions is larger than the opening area of each hole in the outward direction. The stirring device described in claim 1, characterized in that the number of openings in the inward direction of each of the multiple holes penetrating inward and outward directions of the first region is greater than the number of openings in the outward direction. The stirring device described in claim 5, characterized in that the multiple holes penetrating inward and outward directions of the first region have their respective penetration paths branched within the cylindrical portion. The stirring device described in claim 1, characterized in that the rotating member has a horizontal portion inside the cylindrical portion that is perpendicular to the rotation axis of the rotating member, and the internal space of the cylindrical portion is divided into an upper space and a lower space by the horizontal portion. The plurality of holes penetrating in the inward and outward direction of the first region have through-paths of the individual holes branched within the cylindrical portion,
8. The stirring device according to claim 7, wherein the inward openings of the individual holes are arranged in the upper space and the lower space, respectively. The stirring device described in claim 7, characterized in that the multiple holes penetrating the first region in an inward and outward direction are arranged so that holes whose inward openings are located in the upper space and holes whose inward openings are located in the lower space are alternately aligned in the circumferential direction of the cylindrical portion.