JP2019025433A - Agitation device - Google Patents

Abstract

To provide an agitation device capable of agitating fluid to be agitated so as to form a circulation flow which includes an axial flow of a vertical direction in an agitation tank without installing a regulation member which regulates a flow direction of the fluid to be agitated due to an inner part lateral wall of the agitation tank.SOLUTION: An agitation device includes: an agitation blade 3 which is provided on a lower end part of a rotation shaft 2, is rotated together with the rotation shaft 2, agitates the fluid F to be agitated in an agitation tank 1 and gives a flow proceeding to the lower side for the fluid F to be agitated; and a guide part 4 which is provided on a bottom part 1b of the agitation tank 1 so as to be arranged in non-contact with the rotation shaft 2 and the agitation blade 3 and guides the fluid F to be agitated proceeding to the lower side from the agitation blade 3 toward the radial direction external side of the rotation shaft 2. The guide part 4 includes a direction changing part 5 which is provided on a portion opposite to the agitation blade 3 of the bottom part 1b of the agitation tank 1 and changes a flow direction m1 of the fluid F to be agitated proceeding to the lower side from the agitation blade 3 toward the radial direction external side m2 of the rotation shaft 2 and a plurality of partition parts 6 which are radially provided around the direction changing part 5 and partition a region around the direction changing part 5 into a plurality of regions.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stirrer suitable for fluid agitation (including slurry agitation), and in particular, agitation processing such as mixing, dissolution, crystallization, reaction, and slurry suspension of fluid under an axial flow agitation operation is efficient. The present invention relates to an axial flow type stirring device for performing well.

  As is well known, various types of stirring blades are used in the stirring device depending on the purpose, and various types of blade shapes are employed depending on the viscosity of the fluid. For example, an anchor blade for forcibly moving the liquid on the wall of the stirring tank, a ribbon blade with a spiral blade, and the like are employed. However, for a fluid having a relatively low viscosity, for example, as shown in Patent Document 1, flat paddle blades are arranged vertically at the lower end and the middle of the rotating shaft, and the rotating shaft is a cylindrical stirring tank. A system is often employed in which a plurality of baffles are vertically installed vertically along the inner side wall of the agitation tank to generate an axial flow in the vertical direction. This is because uniform stirring can be easily achieved with a simple configuration.

JP 2001-219046 A (Embodiment of the Invention, FIG. 1)

In the agitator, the fluid in the agitation tank is caused to flow from the central part to the peripheral part of the agitation tank by the upper and lower paddle blades, resulting in only a partial circulation flow. When stirring a high slurry, there is a concern that the concentration of the slurry varies and uniform mixing cannot be obtained.
On the other hand, in the stirring device disclosed in Patent Document 1, axial rotation blades and paddle blades are fixedly installed on the rotating shaft in order, and a plurality of baffles are vertically moved along the inner side wall of the stirring tank. It is installed vertically (see FIG. 1 of Patent Document 1). The lower side of the paddle blade is formed so as to be rotatable with a slight gap between it and the inner bottom surface of the stirring tank. The axial flow blade is a propeller blade type axial flow blade, and is formed so as to generate a downward flow along the rotation shaft as the rotation shaft rotates. By adopting the above arrangement, the center portion of the agitation tank is composed of a downward flow that flows downward from above and an upward flow that flows upward from below along the wall surface of the agitation tank. Can be formed.
However, as in Patent Document 1, in order to install a baffle on the inner side wall of the stirring tank, the inner side wall of the stirring tank is required to have sufficient strength to withstand the load on the baffle caused by the flow of the stirring fluid generated in the stirring tank. Therefore, reinforcement work and the like for strengthening the inner side wall of the agitation tank are required.

  The technical problem to be solved by the present invention is to provide a circulating flow including an axial flow in the vertical direction in the stirring tank without installing a regulating member that restricts the flow direction of the stirring fluid on the inner side wall of the stirring tank. It is to be able to stir the stirring fluid to form.

  In order to solve the above-mentioned problems, the present inventors have a structure in which a baffle is not installed on the inner side wall of a stirring tank in an axial flow type stirring apparatus including an axial flow type stirring blade. Pay close attention to the shape of the bottom surface of the stirring tank and the installation of various baffles, and study and analyze the flow in the stirring tank when many bottom surface shapes and baffles are installed. As a result of devising the bottom structure of the stirring tank, the downflow that flows from the top to the bottom of the stirring tank in the same manner as the axial flow type stirring apparatus in which the baffle is installed on the inner side wall of the stirring tank, and the stirring It has been found that the whole can form one circulating flow consisting of an upward flow flowing from the lower side to the upper side along the wall surface of the tank, leading to the present invention.

  A first technical feature of the present invention is that a hollow portion having a substantially circular shape with a bottomed cross section is provided, a stirring tank capable of storing a stirring fluid in the hollow portion, and a downward direction from a substantially upper center of the stirring tank. A rotating shaft that is suspended so as to be in non-contact with the bottom of the stirring tank, and is provided at the lower end of the rotating shaft, and rotates together with the rotating shaft to stir the stirring fluid in the stirring tank. A stirring blade that applies a downward flow to the stirring fluid; and a stirring fluid that is provided at the bottom of the stirring tank so as to be disposed in non-contact with the rotating shaft and the stirring blade. A guide portion that guides the rotation shaft radially outward, and the guide portion is provided at a portion of the bottom of the stirring tank that faces the stirring blade, and is directed downward from the stirring blade. Change the flow direction of the agitating fluid toward the outside in the radial direction of the rotating shaft. A direction changing section, radially provided with a plurality around the direction changing unit, a stirring device and having an a partition portion for partitioning the area around the direction changing portion into a plurality of regions.

According to a second technical feature of the present invention, in the stirrer provided with the first technical feature, the direction changing portion has a substantially central portion of the bottom portion of the stirring tank in a mountain shape compared to other portions. The stirring device is configured as a raised bulge.
According to a third technical feature of the present invention, in the stirrer having the second technical feature, the direction changing portion is a mountain-shaped ridge having an outer diameter larger than the blade diameter of the stirring blade. The stirring device characterized by the above.
According to a fourth technical feature of the present invention, in the agitation device having the first technical feature, three or more of the partition portions are installed at equal angular intervals around the direction changing portion. It is a stirring device.
According to a fifth technical feature of the present invention, in the agitation device having the first technical feature, the partition portion is provided so as to straddle a region outside the direction change portion from a region inside the direction change portion. It is the stirring apparatus characterized by the above-mentioned.
According to a sixth technical feature of the present invention, in the stirring device provided with the first technical feature, the partition portion has an upper edge position continuously obliquely downward toward the outer side in the radial direction of the rotating shaft. It is a stirring apparatus characterized by changing to.
According to a seventh technical feature of the present invention, in the agitation device having the first technical feature, the partition portion is located below a portion located at an uppermost position of the direction changing portion. A stirring device.
According to an eighth technical feature of the present invention, in the agitation device having the first technical feature, the partition portion is a region facing the direction changing portion and is located above a portion located at an uppermost position of the direction changing portion. Is also a stirring device characterized by having a portion located above.

According to the first technical feature of the present invention, the circulation flow that includes the axial flow in the vertical direction in the stirring tank is provided without installing a regulating member that restricts the flow direction of the stirring fluid on the inner side wall of the stirring tank. The agitating fluid can be agitated to form
According to the second technical feature of the present invention, the direction changing portion can be easily constructed at the bottom of the stirring tank.
According to the third technical feature of the present invention, the change operation of the flow direction of the stirring fluid by the direction changing portion is stabilized as compared with the aspect in which the outer diameter of the mountain-shaped ridge is equal to or less than the blade diameter of the stirring blade. be able to.
According to the fourth technical feature of the present invention, the agitating fluid whose direction has been changed by the direction changing unit can be distributed substantially evenly with respect to the radial direction.
According to the fifth technical feature of the present invention, it is possible to accurately regulate the flow direction of the stirring fluid whose direction has been changed by the direction changing unit, as compared with an aspect in which no partition is provided in the region in the direction changing unit. it can.
According to the sixth technical feature of the present invention, the stirring fluid whose direction has been changed by the direction changing section can be guided to the inner side wall of the stirring tank, and the stirring fluid can be easily raised along the inner side wall.
According to the seventh technical feature of the present invention, when the agitating fluid directed downward from the agitating blade is guided outward in the radial direction of the rotating shaft, the agitating fluid after the direction change is directed toward the radial direction periphery. You can partition and guide.
According to the eighth technical feature of the present invention, when the agitating fluid directed downward from the agitating blade is guided outward in the radial direction of the rotating shaft, the direction of the agitating fluid is changed toward the radial direction at the same time. You can partition and guide.

(A) is explanatory drawing which shows the outline | summary of embodiment of the stirring apparatus to which this invention was applied, (b) is a perspective view which shows the principal part of the guide part provided in the bottom part of the stirring tank. (A) is explanatory drawing which shows the whole structure of the stirring apparatus which concerns on Embodiment 1, (b) is a perspective view which shows a guide part periphery. 2A is an enlarged explanatory view around the guide portion shown in FIG. 2A, and is an explanatory view schematically showing the guiding action of the flow of the stirring fluid by the guide portion, and FIG. 2B is a plan explanatory view of the guide portion. . (A) is explanatory drawing which shows the whole structure of the stirring apparatus which concerns on Embodiment 2, (b) is a perspective view which shows a guide part periphery. 4A is an enlarged explanatory view around the guide portion shown in FIG. 4A, and is an explanatory view schematically showing the guide action of the stirring fluid flow by the guide portion, and FIG. 4B is a plan explanatory view of the guide portion. . (A) (b) is explanatory drawing which shows the principal part of the guide part of the stirring apparatus which concerns on the modification 1,2. (A) is a stirrer according to Example 1, (b) is a stirrer according to Example 2, (c) is a stirrer according to Comparative Example 1, and (d) is a schematic view of a stirrer according to Comparative Example 2. It is explanatory drawing shown in. (A) is explanatory drawing which shows the simulation result of the flow direction of the stirring fluid at the time of operating the stirring apparatus which concerns on Example 1, (b) is the stirring fluid at the time of operating the stirring apparatus which concerns on Example 2. FIG. It is explanatory drawing which shows the simulation result of a flow direction. (A) is explanatory drawing which shows the simulation result of the flow direction of the stirring fluid at the time of operating the stirring apparatus which concerns on the comparative example 1, (b) is the stirring fluid at the time of operating the stirring apparatus which concerns on the comparative example 2. It is explanatory drawing which shows the simulation result of a flow direction. (A) calculates | requires the angle which the direction which the fluid flows and the perpendicular | vertical upward direction make on the surface of the fluid in the height of 0.6 m from the bottom part of a stirring tank, when operating the stirring apparatus which concerns on Example 1. FIG. FIG. 5 is an explanatory view schematically showing a distribution of a region whose angle is within 15 ° and a plan view thereof, and (b) shows that when the stirrer according to Example 2 is operated, it is 0 from the bottom of the stirring tank. In the surface of the fluid at a height of .6 m, an angle formed by the direction in which the fluid flows and the vertically upward direction is obtained, and an explanatory view and a plan view schematically showing the distribution of a region in which the angle is within 15 ° is there. (A) calculates | requires the angle which the direction which the fluid flows and the perpendicular | vertical upward direction make on the surface of the fluid in the height of 0.6 m from the bottom part of a stirring tank, when operating the stirring apparatus which concerns on the comparative example 1. FIG. 8 is an explanatory view schematically showing a distribution of a region whose angle is within 15 ° and a plan view thereof, and (b) shows that when the stirrer according to Comparative Example 2 is operated, it is 0 from the bottom of the stirrer tank. In the surface of the fluid at a height of .6 m, an angle formed by the direction in which the fluid flows and the vertically upward direction is obtained, and an explanatory view and a plan view schematically showing the distribution of a region in which the angle is within 15 ° is there. (A) calculates | requires the angle which the direction which the fluid flows and the perpendicular | vertical upward direction make on the surface of the fluid in the height of 0.6 m from the bottom part of a stirring tank, when operating the stirring apparatus which concerns on the comparative example 3. FIG. 5 is an explanatory view schematically showing a distribution of a region whose angle is within 15 ° and a plan view thereof, and (b) shows that when the stirrer according to Comparative Example 4 is operated, it is 0 from the bottom of the stirring tank. An angle between the fluid flow direction and the vertically upward direction on the surface of the fluid at a height of 6 m is obtained, and a plan view schematically showing the distribution of a region where the angle is within 15 ° and immediately below the stirring blade It is explanatory drawing which shows the flow line of the fluid in the periphery of the part where the bottom face baffle located in FIG.

Outline of Embodiment FIG. 1A shows an outline of an embodiment of a stirring device to which the present invention is applied, and FIG. 1B is a perspective view showing the main part thereof.
In the figure, the stirring device has a hollow portion 1a having a bottomed cross-sectional shape that is substantially circular, and a stirring tank 1 that can contain a stirring fluid F in the hollow portion 1a, and a lower part from the substantially upper center of the stirring tank 1. A rotating shaft 2 that is suspended so as to be in non-contact with the bottom 1b of the stirring tank 1, and is provided at the lower end of the rotating shaft 2, and rotates together with the rotating shaft 2 to stir fluid in the stirring tank 1 The stirring blade 3 that stirs F and applies a downward flow to the stirring fluid F, and is provided at the bottom 1b of the stirring tank 1 so as to be disposed in non-contact with the rotating shaft 2 and the rotating blade 3, and the stirring blade 3 And a guide part 4 for guiding the agitating fluid F directed downward from the rotary shaft 2 radially outward. The guide part 4 is provided at a portion of the bottom 1b of the agitation tank 1 facing the agitation blade 3. The flow direction m1 of the stirring fluid F that is provided and is directed downward from the stirring blade 3 is defined as the radially outward direction m2 of the rotating shaft 2. A direction changing unit 5 for changing toward those having provided more radially around the direction changing unit 5, a partition portion 6 for partitioning the area around the direction changing portion 5 into a plurality of regions, the.

In such technical means, the agitation tank 1 is usually formed in a substantially cylindrical shape with a bottom, but is not limited thereto, and has a hollow portion 1a having a substantially circular cross section with a bottom. The outer shape does not matter. Here, the hollow portion 1a having a substantially circular cross section is not limited to a columnar shape, but also includes an inverted truncated cone shape, a truncated cone shape, and the like.
Moreover, the rotating shaft 2 should just be arrange | positioned in the approximate center of the stirring tank 1, and employ | adopts the system arrange | positioned in non-contact with the bottom part 1b of the stirring tank 1 in the state suspended from the upper approximate center of the stirring tank 1. Is done.
Furthermore, the stirring blade 3 should just be provided in the lower end part of the rotating shaft 2, and the mode which the lowest end position of the rotating shaft 2 protrudes below the stirring blade 3 is also included. Further, as the type of the stirring blade 3, any propeller blade, paddle blade, etc. may be appropriately selected as long as the stirring fluid F is stirred to give a downward flow (including not only the vertical direction but also obliquely downward). Further, one or more are provided in the axial direction of the rotating shaft 2.

Furthermore, the guide unit 4 may be provided on the bottom 1b of the stirring tank 1 and guides the stirring fluid F directed downward from the stirring blade 3 toward the radial direction of the rotating shaft 2, and in this case, the direction Since either one of the changing unit 5 and the partition unit 6 cannot obtain a desired guiding action, it is necessary to have both.
Moreover, the direction change part 5 should just have a surface which changes the flow direction m1 of the stirring fluid F which goes below to the radial direction outer side m2 of the rotating shaft 2, and the whole site | part facing the stirring blade 3 is curved. Alternatively, it may be multi-planar or may be provided with a ridge or groove extending radially in a part of the portion facing the stirring blade 3 to form a desired surface. Furthermore, the direction change part 5 may be formed integrally with the bottom 1b of the stirring tank 1, or a separate one may be fixed by welding or the like.
Moreover, the partition part 6 may use a rib-shaped uniform board | plate material, or may use the board | plate material from which board thickness changes, and the height dimension of an up-down direction may be decided uniformly, and rotation You may change toward the radial direction outward of the axis | shaft 2. FIG. Furthermore, the partition part 6 may be provided separately from the direction changing part 5 or may be formed integrally.

  Thus, as described above, in the guide unit 4 of this example, the direction changing unit 5 changes the flow direction m1 of the stirring fluid F directed downward from the stirring blade 3 toward the radially outer side m2 of the rotating shaft 2. Then, the stirring fluid F distributed substantially evenly for each region partitioned by the partition 6 is guided toward the lower part of the inner side wall 1c of the stirring tank 1, and further, the inner side wall 1c of the stirring tank 1 is guided from the lower part of the inner side wall 1c. Is moved in the upward direction toward the arrow m3, and the stirring fluid F moved in the upward direction in accordance with the stirring operation of the stirring blade 3 is moved in the direction of the rotating shaft 2 from the vicinity of the surface of the stirring fluid F. Inhale again from above. For this reason, the stirring fluid F moved downward by the stirring blade 3 is moved toward the inner side wall 1c of the stirring tank 1 through the guide portion 4 of the stirring tank 1, and further, the inner side wall of the stirring tank 1 from the lower side of the inner side wall 1c. Circulating mainly by an axial flow in the vertical direction (corresponding to the axial direction of the rotating shaft 2) in which it is moved upward along 1c, moved in the direction of the rotating shaft 2 near the surface of the stirring fluid F, and returned to the stirring blade 3 again. A moving circulating flow will be generated.

Next, a typical aspect or a preferable aspect of the stirring apparatus according to the present embodiment will be described.
First, as a typical aspect of the direction changing part 5 in the guide part 4, there is an aspect in which the substantially central part of the bottom part 1b of the stirring tank 1 is configured as a raised part that is raised in a mountain shape as compared with other parts. Can be mentioned. In this example, it suffices if a chevron-like raised portion can be formed at the substantially central portion of the bottom 1b of the stirring tank 1, and the shape of the direction changing portion 5 can be easily formed by molding or welding. In addition, about the mountain-shaped protruding part, the solid structure which made the thickness of the bottom part 1b of the stirring tank 1 partially thick may be sufficient, and you may make it raise without changing the thickness of the bottom part 1b. In particular, in the case of the former solid structure, the mountain-shaped raised portion also functions as a reinforcing portion for increasing the strength of the bottom portion 1 b of the stirring tank 1.
As a preferable aspect of this kind of direction change part 5, the aspect which is a mountain-shaped protruding part of the outer diameter larger than the blade diameter of the stirring blade 3 is mentioned. In this example, since the outer diameter of the mountain-shaped ridge is larger than the blade diameter of the stirring blade 3, most of the stirring fluid F directed downward from the stirring blade 3 hits the surface of the mountain-shaped ridge, The flow direction m1 is changed toward the radially outer side m2 of the rotating shaft 2. In the aspect in which the outer diameter of the mountain-shaped ridge is smaller than the blade diameter of the stirring blade 3, a partial circulation flow (vortex) is formed between the stirring blade 3 and the flat portion of the bottom 1 b of the stirring tank 1. It is preferable to set conditions appropriately so as to avoid such a situation.

Moreover, as a preferable aspect of the partition part 6 among the guide parts 4, the aspect installed 3 or more extended radially around the direction change part 5 of a mountain-shaped protruding part is mentioned. The arrangement of the partition part 6 is not particularly limited as long as the partition part 6 is arranged radially toward the inner side wall 1c of the stirring tank 1. However, if the adjacent partition parts 6 are extremely separated from each other, the vortex flows on the surface of the direction changing part 5 In the case of extremely close proximity, there is a high risk of eddy currents occurring in the gaps between the partition parts 6, so that the plurality of partition parts 6 may be arranged at equal intervals. preferable.
This example is a mode in which the stirring fluid F whose direction has been changed by the direction changing unit 5 is radiated substantially uniformly for every several minutes (three or more) of the partitioning unit 6. Here, when the number of the partition portions 6 is 2, the partitioned region is wide, and there is a concern that a flow flowing in the circumferential direction in the region appears.
Furthermore, as another preferable aspect of the partition part 6, the aspect provided ranging over the area | region outside the said direction change part 5 from the area | region in the direction change part 5 is mentioned. In this example, the stirring fluid F whose direction has been changed by the direction changing unit 5 is immediately guided along the flow path partitioned by the partition unit 6. Here, as an aspect in which the partition part 6 does not straddle the area inside and outside the direction changing part 5, it is an aspect that is installed only in the area outside the direction changing part 5, but in this aspect, the direction has been changed. Since there is a concern that a partial circulation flow (vortex) is formed before the stirring fluid F reaches the partition portion by the partition portion 6, it is possible to appropriately set conditions so as to avoid the occurrence of such a circulation flow. preferable.

Furthermore, as another preferable aspect of the partition part 6, the aspect from which the upper edge position changes diagonally downward continuously toward the radial direction outer side of the rotating shaft 2 is mentioned. In this example, the flow direction of the stirring fluid F whose direction has been changed by the direction changing unit 5 is regulated by the partition unit 6, but the partitioning effect by the partition unit 6 is reduced as it approaches the inner side wall 1c of the stirring tank 1, This is a mode in which the stirring fluid F easily flows upward.
Moreover, as another preferable aspect of the partition part 6, the aspect located below rather than the part located in the uppermost part of the direction change part 5 is mentioned. This example is a mode in which the action by the direction changing unit 5 is emphasized.
Furthermore, as another preferable aspect of the partition part 6, the aspect which has a part located in the area | region which faced the direction change part 5 rather than the part located in the uppermost part of the said direction change part 5 is mentioned. This example is a mode in which the action by the partition 6 is emphasized.

Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings.
Embodiment 1
FIG. 2A is an explanatory diagram showing the overall configuration of the stirring device according to the first embodiment.
-Overall configuration of the stirring device-
In the figure, a stirring device 10 is a so-called axial flow type stirring device, and a rotating shaft 20 provided with a stirring blade 30 is provided at a position along the central axis in a bottomed substantially cylindrical stirring tank 11. The bottom portion 11b of the stirring tank 11 is provided with a guide portion 40 that can guide the stirring fluid F downward from the stirring blade 30 toward the outside in the radial direction of the rotating shaft 20.

-Stirring tank-
The stirring tank 11 is a hollow bottomed and substantially cylindrical tank having an opening in the upper part, and performs stirring processes such as fluid mixing, dissolution, crystallization, reaction, slurry suspension, and the like in the cavity 11a in the tank. It contains the target fluid. The type of fluid is not particularly limited, and may be two or more liquids that require stirring treatment such as mixing, dissolution, crystallization, reaction, slurry suspension, or a mixture of solid and liquid.
A rotating shaft 20 hangs downward in the center of the upper portion of the stirring tank 11, and the upper portion of the rotating shaft 20 is connected to a motor (not shown) and the lower end of the rotating shaft 20 is connected to the stirring tank 11. It arrange | positions non-contacting with respect to the bottom part 11b. The opening at the top of the stirring tank 11 may be left open, but may be closed by the lid member 12 if necessary. However, the lid member 12 has an opening (a hole or It is sufficient to secure a notch) and a fluid inlet for the target fluid.

-Agitator blade-
In this example, a stirring blade 30 is provided at the lower end portion of the rotating shaft 20 in a non-contact state with the bottom portion 11b of the stirring tank 11, and by rotating the stirring blade 30, the fluid inside the stirring tank 11 is supplied. It is designed to stir.
Here, as shown in FIG. 2A, the stirring blade 30 has a ring-shaped blade support 31 fitted and fixed to the lower end portion of the rotary shaft 20, and around the blade support 31. Shows a plurality of (three in this example) blade members 32 provided radially at equal angular intervals.
In particular, in this example, it is preferable to use an inclined paddle blade or a propeller blade type axial flow blade as the stirring blade 30 so that a downward flow m1 is generated along the rotation shaft 20 with the rotation of the rotation shaft 20. It has become. In order to control the axial flow in the stirring tank 11, it is also preferable to arrange an inclined paddle blade or a propeller blade at the intermediate portion of the rotating shaft 20 above the stirring blade 30 provided at the lower end portion of the rotating shaft 20. .

-Guide section-
In the present embodiment, the guide portion 40 is stirred downward from the stirring blade 30 as shown in FIGS. 2A and 2B and FIGS. 3A and 3B schematically showing the flow direction of the stirring fluid F. A direction changing unit 50 that changes the flow direction m1 of the fluid F toward the radially outer side m2 of the rotating shaft 20, and a plurality of radial regions around the direction changing unit 50, and a plurality of regions around the direction changing unit 50 And a partition portion 60 for partitioning the region.

<Direction changer>
As shown in FIG. 2 (a), in this example, the direction changing unit 50 is provided in a portion of the bottom 11b of the stirring vessel 11 that faces the stirring blade 30, and the substantially central portion of the bottom 11b of the stirring vessel 11 is It is configured as a mountain-shaped raised portion that is raised in a mountain shape compared to other portions. In this example, the mountain-shaped raised portion as the direction changing portion 50 has a curved top 51 with the center of the bottom 11b of the stirring tank 11 as a vertex, and the periphery of the bottom 11b of the stirring tank 11 from the top 51 It has a shape that spreads toward the bottom with a gentle curved surface. Since such a mountain-shaped ridge is provided, the flow direction m1 of the discharge flow immediately below the stirring blade 30 can be set to the flow direction m2 toward the inner side wall 11c of the stirring tank 11, and the efficiency in the stirring tank 11 is increased. Axial flow is well formed.
And in this example, if the outer diameter connected to the bottom part 11b of the stirring tank 11 of the mountain-shaped ridge is dm, the blade diameter of the stirring blade 30 is dw, and the inner diameter of the cavity 11a of the stirring tank 11 is dn,
dm <dn (1)
dm> dw (2)
It is set to satisfy the relationship.
Here, it supplements about each condition.
About (1), although the position connected to the bottom part 11b of the stirring tank 11 of the mountain-shaped protruding part means that it is set in the position away from the internal side wall 11c of the stirring tank 11, The skirt may be expanded until it comes close to the inner side wall 11c.
As for (2), most of the stirring fluid F flowing downward by the stirring blade 30 hits the mountain-shaped raised portion of the bottom portion 11b of the stirring tank 11, and the radial outer side m2 of the rotating shaft 20 is reached. This is effective in changing the flow of the agitating fluid F toward.

  The shape of the mountain-shaped ridge is not particularly limited, so that the stirring treatment such as mixing, dissolution, crystallization, reaction, slurry suspension, etc. of the fluid charged into the stirring tank 11 is performed efficiently. A downward flow that flows from above to below along the center of the stirring tank 11 along the rotation axis 20 along with the rotation of the rotating shaft 20, and an upward flow that flows from below to above along the inner side wall 11c surface of the stirring tank 11. The flow direction m1 of the discharge flow toward the lower side of the stirring fluid F immediately below the stirring blade 30 is changed to the radially outward m2 of the rotary shaft 20 so that the whole can form one circulating flow. It is selected as appropriate to shift to the current. And it is preferable that the shape of the mountain-shaped bulge part is comprised by the curved surface which does not have an unevenness | corrugation in the radial direction of the rotating shaft 20, so that a partial circulation flow may not generate | occur | produce in the circulation flow mentioned above.

<Partition section>
In this example, as shown in FIGS. 2 (a) and 2 (b), the partition portion 60 includes a bottom baffle extending radially around a mountain-shaped ridge as the direction changing portion 50, and the bottom baffle is a mountain shape. For example, welding is performed on the bottom of the chevron-like raised portion and the bottom of the stirring tank 11. Three or more (four in this example) are installed at equiangular intervals around the chevron-shaped ridge. The arrangement of the bottom baffle as the partition part 60 is not particularly limited as long as the bottom baffle is arranged radially toward the inner side wall 11c of the stirring tank 11, but if the adjacent bottom baffles are extremely far apart, There is a possibility that vortex flow may occur on the surface, and when it is extremely close, there is a high possibility that vortex flow is generated in the gap between the bottom surface baffles, so the plurality of bottom surface baffles are arranged at equal intervals. It is preferable.
Further, if the number of the bottom baffles installed is too large, there is a concern that resistance may be caused in generating a circulating flow including an axial flow, and about 6 or less is preferable.
Further, in this example, as shown in FIG. 2, the bottom baffle as the partition portion 60 is provided in the stirring tank 11 outside the mountain-shaped ridge from the region of the skirt of the mountain-shaped ridge as the direction changing portion 50. It is provided across the bottom surface.
Here, the portion of the bottom baffle provided in the mountain-shaped ridge region is arranged to be positioned below the top 51 of the mountain-shaped ridge by a dimension g. The uppermost part of the upper edge of the bottom baffle is located immediately below the stirring blade 30 provided at the lower end of the rotating shaft 20, but is arranged with a certain gap from the stirring blade 30. Yes.
Further, the bottom edge of the bottom baffle is formed in accordance with the bottom portion of the mountain-shaped ridges as the direction changing unit 50 and the bottom shape of the stirring tank 11, and the bottom surface of the mountain-shaped ridges of the direction changing unit 50 and It is fabricated and arranged so as to be substantially in contact with the bottom shape of the stirring tank 11.
Furthermore, the upper edge portion of the bottom baffle as the partition portion 60 has a shape such that the position of the upper edge continuously changes obliquely downward toward the outer side in the radial direction of the rotating shaft 20. That is, the bottom baffle gradually decreases from h0 to h1 (h1 <h0) from the center of the bottom 11b of the stirring tank 11 toward the radially outer side with the bottom surface of the stirring tank 11 as a reference position. It is like that.

-Example of stirring operation using a stirring device-
Next, an example of the stirring operation of the stirring device according to the first embodiment will be described with reference to FIG.
Now, after the stirring fluid F to be stirred is stored in the hollow portion 11a of the stirring tank 11, when the stirring operation by the stirring blade 30 is started by rotating the rotating shaft 20, the following is performed with respect to the stirring fluid F: A stirring operation is performed.
First, the stirring blade 30 applies a downward flow to the stirring fluid F as shown by the flow direction m1 in FIG. In this state, the stirring fluid F traveling downward from the stirring blade 30 collides with the surface of the mountain-shaped ridge as the direction changing unit 50, and as shown by the flow direction m2 in FIGS. 3 (a) and 3 (b), The flow direction is changed radially outward (radial direction) of the rotating shaft 20 on the surface of the mountain-shaped ridge. Thereafter, the stirring fluid F whose direction has been changed in the radial direction is distributed to each region partitioned by a plurality of (four) bottom baffles, and flows toward the lower portion of the inner side wall 11 c of the stirring tank 11.
In particular, in this example, when the descending flow of the stirring fluid F from the stirring blade 30 collides with the mountain-shaped raised portion as the direction changing portion 50, it is not subjected to the partitioning action by the bottom baffle as the partitioning portion 60, When the stirring fluid F is distributed to the partition region by the bottom baffle around the mountain-shaped protuberance, the direction is changed along the mountain-shaped protuberance toward the radially outward m2 of the rotary shaft 20. The partition action by the baffle is weak, and the difference in speed characteristics between the stirring fluids F distributed in each partition region is small.

Furthermore, in this example, since the bottom baffle as the partition portion 60 has a shape in which the height dimension gradually decreases outward in the radial direction of the rotating shaft 20, each stirring fluid distributed to the partition region by the bottom baffle. As indicated by m2 in FIGS. 3 (a) and 3 (b), F flows toward the inner side wall 11c of the stirring vessel 11, and after colliding with the inner side wall 11c, F is shown in the flow direction m3 in FIG. 3 (a). As described above, the upward flow is changed upward along the inner side wall 11c, but the stirring fluid F distributed in each partition region compensates for the boundary portion earlier because the bottom baffle height is lowered. However, it is generated as a substantially uniform upward flow as a whole around the inner side wall 11 c of the stirring tank 11.
Then, as shown by the flow direction m3 in FIG. 3A, the agitating fluid F that has risen upward along the inner side wall 11c and has risen to a certain position is shown in FIG. 3A in the flow direction m4. As shown in the drawing, the agitating blade 30 is sucked into the downward flow generated along the rotating shaft 20 located above the stirring blade 30 with the flow of the stirring fluid F to the downward flow by the stirring blade 30 and is again stirred. It repeats the cyclic action of returning to the vicinity.

As described above, according to the present embodiment, the bottom portion 11b of the agitation tank 11 is provided with the guide part 40 (direction changing part 50, partition part 60) as described above, so that the agitation fluid F immediately below the agitation blade 30 is provided. The flow is not decelerated, and the flow is directed toward the outer periphery of the agitation tank 11, so that a strong upward flow can be obtained from the bottom 11b of the agitation tank 11, and the whole forms one circulation flow. It is understood that you can.
Therefore, as shown in Patent Document 1, as in the embodiment in which a baffle is installed on the side wall of the agitation tank, the side wall of the agitation tank is not subjected to reinforcement work to cope with the load applied to the baffle. The stirring ability equivalent to the aspect which installed the baffle can be obtained.

Embodiment 2
FIG. 4A is an explanatory diagram showing the overall configuration of the stirring device according to the second embodiment, and FIG. 4B is a perspective view of a guide portion used in the stirring device.
In the figure, the basic configuration of the stirring device 10 includes the stirring tank 11, the rotating shaft 20, the stirring blade 30, and the guide unit 40, as in the first embodiment, but the configuration of the guide unit 40 is implemented. Different from Form 1. Components similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted here.
In the present embodiment, the guide unit 40 includes a direction changing unit 50 having a configuration substantially similar to that of the first embodiment, but the configuration of the partition unit 60 is different from that of the first embodiment.
<Direction changer>
In this example, the direction changing portion 50 is provided in a portion facing the stirring blade 30 in substantially the same manner as in the first embodiment, and the substantially central portion of the bottom portion 11b of the stirring tank 11 has a mountain shape compared to the other portions. It is configured as a mountain-shaped ridge that is raised. In this example, the mountain-shaped ridge has a curved top 51 with the center of the bottom 11 b of the stirring tank 11 as the apex, and has a gently curved surface from the top 51 toward the periphery of the bottom 11 b of the stirring tank 11. It has a shape that forms a base and spreads out.
The dimensional relationship of the mountain-shaped ridges in this example is the same as in the first embodiment.

<Partition section>
As shown in FIGS. 4A and 4B, the partition portion 60 has a shape substantially similar to that of the first embodiment, and extends radially around the mountain-shaped ridge as the direction changing portion 50. The bottom baffle is composed of a rib-like plate material that is erected in a substantially vertical direction with respect to the bottom of the mountain-shaped raised portion and the bottom surface of the agitation tank 11. And three or more (four in this example) are installed at equiangular intervals around the mountain-shaped ridge.
The difference from the first embodiment is that, as shown in FIGS. 4A and 4B, the bottom baffle extending radially around the mountain-shaped ridge is directly below the stirring blade 30, and is used as the direction changing unit 50. It is that all are connected and fixed by the center part of the top part 51 of this mountain-shaped protruding part.
Moreover, the upper edge part of all the bottom baffles as the partition part 60 has the shape which inclines below diagonally toward the radial direction outward of the rotating shaft 20 from the center part of the top part 51 of a mountain-shaped protruding part. Yes. For this reason, in this example, the bottom baffle has a height higher than the surface of the top 51 of the mountain-shaped ridge by a dimension k, and is connected and fixed to each other, but is provided at the lower end of the rotating shaft 20. The stirring blade 30 is disposed in a non-contact manner with a lower end portion of the stirring blade 30.
Further, the bottom edge of the bottom baffle is formed on the bottom surface of the chevron-like ridge and the bottom surface of the stirring tank 11 in accordance with the bottom part of the chevron-like ridge as the direction changing part 50 and the bottom shape of the stirring tank 11. It is created and arranged so as to substantially contact the bottom shape.

-Example of stirring operation using a stirring device-
Next, an example of a stirring operation by the stirring device according to the present embodiment will be described with reference to FIG.
After the stirring fluid F to be stirred is stored in the hollow portion 11a of the stirring tank 11, when the stirring operation by the stirring blade 30 is started by rotating the rotating shaft 20, the following stirring operation is performed on the stirring fluid F. Is done.
The stirring blade 30 applies a downward flow to the stirring fluid F as indicated by the flow direction m1 in FIG. In this state, the stirring fluid F traveling downward from the stirring blade 30 collides with the surface of the mountain-shaped ridge as the direction changing unit 50 and rotates on the surface of the mountain-shaped ridge as indicated by the flow direction m2. The flow direction is changed radially outward (radial direction) of the shaft 20. Thereafter, the stirring fluid F whose direction has been changed in the radial direction is distributed to each region partitioned by a plurality of (four) bottom baffles, and flows toward the lower portion of the inner side wall 11 c of the stirring tank 11.
In particular, in this example, when the downward flow of the stirring fluid F from the stirring blade 30 collides with the mountain-shaped ridge, the bottom baffle that is all connected and fixed at the center of the top 51 of the mountain-shaped ridge. The stirring fluid F that has undergone the partitioning action and is changed in the radial direction on the surface of the chevron-like raised portion is distributed to each region partitioned by each bottom baffle, and the inner side wall 11c of the stirring tank 11 Toward the lower side of the tank and reaches substantially uniformly toward the inner side wall 11 c of the stirring tank 11.
Note that the upper edge portion of the bottom baffle as the partition portion 60 has a shape such that the upper edge position continuously changes obliquely downward toward the outer side in the radial direction of the rotating shaft 20. That is, the bottom baffle gradually decreases from h0 to h1 (h1 <h0) from the center of the bottom 11b of the stirring tank 11 toward the radially outer side with the bottom surface of the stirring tank 11 as a reference position. The operation is substantially the same as that of the first embodiment.
And the stirring fluid F which reached the lower part of the internal side wall 11c of the stirring tank 11 becomes an upward flow substantially uniformly upward along the internal side wall 11c as shown by the flow direction m3 in FIG. The stirring fluid F that has risen to the position of FIG. 5 is rotated above the stirring blades 30 as the stirring fluid F flows downwardly by the stirring blades 30 as indicated by the flow direction m4 in FIG. The circulation operation of being sucked into the downward flow generated at the site along the shaft 20 and returning to the vicinity of the stirring blade 30 again is repeated.

◎ Deformation forms 1, 2
The guide unit 40 is not limited to the modes shown in the first and second embodiments, and for example, the first and second modified modes shown in FIGS. 6A and 6B may be used.
The guide part 40 shown to Fig.6 (a) forms the polyhedral planar surface part 55 in the mountain-shaped protruding part as the direction change part 50, for example.
Moreover, the guide part 40 shown in FIG.6 (b) is divided in the surface of the mountain-shaped protruding part as the direction change part 50 by the concave groove extended in the radial direction outward (radial direction) of the rotating shaft 20. As shown in FIG. A protruding portion 56 is provided.

Next, for the stirring devices according to Examples 1 and 2 and Comparative Examples 1 and 2, a simulation for evaluating the stirring operation state was performed.
Example 1
As shown in FIG. 7A, Example 1 is an embodiment of the agitation device 10 according to Embodiment 1, in which four bottom baffles as a partition 60 are raised in a mountain shape as a guide 40. It is the state which was not connected with the top part of a part, and raised the mountain-shaped protruding part as the direction change part 50. FIG.
The simulation conditions are as follows.
(A) The stirring tank 11 has a cylindrical shape with a diameter of 1.0 m and a height of 1.5 m, and the rotating shaft 20 is installed in the vertical direction on the central axis of the stirring tank 11.
(B) As the stirring blade 30, an inclined paddle (three blades) having a diameter of 0.3 m was used. The rotation speed of the stirring blade 30 was 300 rotations per minute.
(C) In the initial state, the fluid to be stirred is filled to a height of 1.2 m. The characteristic values of the fluid used were as follows: a specific gravity of 1100 kg / m ³ and a viscosity of 0.0013 Pa · s, keeping in mind a slurry of a crystallization tank for producing a nickel composite hydroxide which is a precursor of a positive electrode active material for a secondary battery. It was.
(D) The height of the mountain-shaped ridge with the center of the bottom surface of the stirring tank 11 as the apex was 0.2 m. In addition, four rib-shaped bottom baffles extending radially so as to straddle the inside and outside of the mountain-shaped raised portion of the bottom portion 11b of the stirring tank 11 were disposed.
Example 2
As illustrated in FIG. 7B, Example 2 embodies the stirring device 10 according to the second embodiment. The guide unit 40 is more partitioned than the mountain-shaped ridges as the direction changing unit 50. In this embodiment, the four bottom baffles as the portion 60 are raised and the bottom baffles are connected and fixed at the center of the top of the mountain-shaped ridge.
The simulation conditions are the same as (a) to (d) of the first embodiment.

◎ Comparative Example 1
As shown in FIG. 7 (c), the stirring device 10 ′ of Comparative Example 1 hangs down the rotating shaft 20 provided with the stirring blades 30 from the upper center in the stirring tank 11 downward, Is a mode in which no special processing is applied.
The simulation conditions are the same as (a) to (c) of the first embodiment.
◎ Comparative Example 2
In Comparative Example 2, as shown in FIG. 7 (d), a baffle 100 is installed on the inner side wall 11 c of the stirring tank 11 in addition to the same stirring device 10 ′ as in Comparative Example 1.
Regarding the simulation conditions, the following (e) was used in addition to (a) to (c) of Example 1.
(E) About the baffle 100 with which the internal side wall 11c of the stirring tank 11 was equipped, the baffle height was higher than the height of 1.2 m of fluid, and the baffle upper part was made into the state exposed above the liquid level. . The baffle width protruding into the stirring tank 11 was 0.15 m.
◎ Comparative Example 3
Comparative Example 3 is a mode in which the mountain-shaped raised portion as the direction changing portion 50 is left in the guide portion 40 of the stirring device 10 according to the first embodiment, and the bottom baffle as the partition portion 60 is removed.
As the simulation conditions, the conditions of the mountain-shaped ridges of (a) to (c) and (d) of Example 1 were used.
◎ Comparative Example 4
The comparative example 4 is an aspect using only the bottom surface baffle as the partition part 60 without using the mountain-shaped protruding part as the direction changing part 50 in the guide part 40 of the stirring apparatus 10 according to the first embodiment.
As the simulation conditions, the conditions of the bottom baffle 60 of (a) to (c) and (d) of Example 1 were used.

-Simulation results-
Regarding Examples 1 and 2 and Comparative Examples 1 to 4, fluids are put into the respective stirring tanks 11, and the stirring state of the fluids when the rotating shaft 20 is rotated and the fluid in the stirring tank 11 is stirred by the stirring blade 30. Were compared and confirmed by simulation.
For the simulation, fluid analysis software [CFX: ANSYS Inc. ] Was used.

Example 1
The simulation result is shown in FIG.
In the figure, the flow direction of the fluid is indicated by streamlines, and the flow velocity of the fluid expressed in different hues is expressed in gray scale. Here, regarding the flow velocity display of FIG. 8A, the flow velocity is close to zero in dark blue, has a flow velocity of 1.5 m / s near green, and is 2.0 m / s near yellow. It shows that there is. In the gray scale, the display is dark in the order of dark blue>green> yellow.
As shown to Fig.8 (a), by the installation effect of the guide part 40 (the mountain-shaped protruding part as the direction change part 50, the bottom face baffle as the partition part 60) of the bottom part 11b of the stirring tank 11, of the stirring tank 11 In addition to increasing the flow rate of the agitating fluid by reducing the backflow region generated in the lower part of the agitating blade 30 in the shape of the chevron-like raised portion installed on the bottom 11b, it is installed on the bottom 11b of the agitating tank 11. It can be seen that a circulating flow mainly composed of an axial flow is generated by converting the swirl component of the discharge flow from the stirring blade 30 into a radiant component directed to the inner side wall 11c of the stirring tank 11 in the bottom baffle.
In addition, a fluid surface at a height of 0.6 m from the bottom 11b of the agitation tank 11 (half the height of the fluid up to the fluid surface) is set, and the direction of fluid flow at each point on the surface The angle formed with the vertically upward direction was determined, and the region where the angle was within 15 ° was expressed in red, and the region exceeding 15 ° was expressed in blue, and was expressed in gray scale.
The area occupied by the red region was calculated. At this time, the larger the area occupied by the red region, the more upward flow is directed upward along the inner side wall 11c of the stirring tank 11.
The results are shown in FIG. In the gray scale, the blue region is represented as gray near black and the red region is represented as light gray. The same applies to the following examples.
In this example, the area occupied by the red region is 0.128 m ² . From the guide part 40 between the bottom baffles installed in the bottom part 11b of the stirring tank 11, it turns out that the upward flow which goes upwards along the internal side wall 11c has generate | occur | produced.
From the above results, it can be seen that, with the stirring device 10 having the configuration of Example 1, stirring ability equivalent to that of the stirring device (see Comparative Example 2) in which the baffle 100 is installed on the inner side wall 11c of the stirring tank 11 can be obtained. .

Example 2
The simulation result is shown in FIG.
In the figure, the flow direction of the fluid is indicated by streamlines, and the flow velocity of the fluid expressed in different hues is expressed in gray scale. The flow rate display in FIG. 8B is the same as that in FIG.
As shown in FIG. 8 (b), due to the installation effect of the guide part 40 (the mountain-shaped ridge part as the direction changing part 50 and the bottom baffle as the partition part 60) of the bottom part 11b of the stirring tank 11, In substantially the same manner as the result (see FIG. 8A), the flow rate of the stirring fluid is reduced by reducing the backflow region generated in the lower part of the stirring blade 30 in the shape of the mountain-shaped ridges installed at the bottom 11b of the stirring tank 11. In addition to being increased, the swirl component of the discharge flow from the stirring blade 30 is converted into a radiation component toward the inner side wall 11c of the stirring tank 11 by the bottom baffle installed at the bottom 11b of the stirring tank 11. It can be seen that a circulating flow mainly composed of an axial flow is generated.
Moreover, the surface of the fluid in the height of 0.6m from the bottom part 11b of the stirring tank 11 (it becomes half the height to the liquid level of the fluid) is set similarly to Example 1, and each surface on the surface is set. The angle between the fluid flow direction and the vertical upward direction at the point is obtained, and the region where the angle is within 15 ° is expressed in red, and the region exceeding 15 ° is expressed in blue. The area occupied by the region was calculated.
The results are shown in FIG. In this example, the area occupied by the red region is 0.131 m ² . From the guide part 40 of the bottom part 11b of the stirring tank 11, it turns out that the upward flow which goes up along the said internal side wall 11c has generate | occur | produced over the perimeter of the internal side wall 11c. It can be seen that the upward flow is uniformly generated over a wider range than in the first embodiment over the entire circumference of the inner side wall 11c.
From the above results, it can be seen that the stirring device 10 having the configuration of Example 2 can obtain stirring ability equivalent to that of the stirring device (see Comparative Example 2) in which the baffle 100 is installed on the inner side wall 11c of the stirring tank 11. .

◎ Comparative Example 1
The simulation result is shown in FIG.
In the figure, the flow direction of the fluid is indicated by streamlines, and the flow velocity of the fluid expressed in different hues is expressed in gray scale. The flow rate display in FIG. 9A is the same as that in FIG.
As shown in FIG. 9 (a), the swirl velocity component along the inner side wall 11c of the agitation tank 11 which the flow discharged from the agitation blade 30 (inclined paddle blade) has with the rotation of the rotating shaft 20 is enhanced, It turns out that the swirl flow is produced and the flow velocity of the swirl flow is relatively increased in the region close to the liquid surface.
Moreover, the surface of the fluid in the height of 0.6m from the bottom part 11b of the stirring tank 11 (it becomes half the height to the liquid level of the fluid) is set similarly to Example 1, and each surface on the surface is set. The angle between the fluid flow direction and the vertical upward direction at the point is obtained, and the region where the angle is within 15 ° is expressed in red, and the region exceeding 15 ° is expressed in blue. The area occupied by the region was calculated.
The results are shown in FIG. In this example, the area occupied by the red region is 0 m ² . It was confirmed that the swirl flow was the main.

◎ Comparative Example 2
The simulation result is shown in FIG.
In the figure, the flow direction of the fluid is indicated by streamlines, and the flow velocity of the fluid expressed in different hues is expressed in gray scale. The flow rate display in FIG. 9B is the same as that in FIG.
As shown in FIG. 9 (b), the baffle 100 provided on the inner side wall 11c of the stirring tank 11 hits the inner side wall 11c of the stirring tank 11, and an upward flow is formed from the bottom, and the axial flow is mainly used. It turns out that the circulation flow has arisen. It can be seen that the flow velocity of the upward flow from the bottom hits the inner side wall 11c of the stirring tank 11 and is relatively fast.
Moreover, the surface of the fluid in the height of 0.6m from the bottom part 11b of the stirring tank 11 (it becomes half the height to the liquid level of the fluid) is set similarly to Example 1, and each surface on the surface is set. The angle between the fluid flow direction and the vertical upward direction at the point is obtained, and the region where the angle is within 15 ° is expressed in red, and the region exceeding 15 ° is expressed in blue. The area occupied by the region was calculated.
The results are shown in FIG. In this example, the area occupied by the red region is 0.150 m ² . It can be seen that due to the action of the baffle 100, an upward flow is generated along the inner side wall 11 c over the entire circumference of the inner side wall 11 c of the stirring tank 11.

◎ Comparative Examples 3 and 4
In the stirring apparatus of Comparative Example 3, it was not observed that a circulating flow mainly composed of an axial flow as shown in the simulation results of Example 1 (see FIGS. 8A and 8B) was generated.
Similarly to Example 1, the surface of the fluid at a height of 0.6 m from the bottom 11b of the agitation tank 11 (which is half the height to the liquid level of the fluid) is set, and at each point on the surface The angle between the fluid flow direction and the vertically upward direction is obtained, and the region where the angle is within 15 ° is expressed in red, the region exceeding 15 ° is expressed in blue, and the red region The area occupied by was calculated.
The results for Comparative Example 3 are shown in FIG. In this example, the area occupied by the red region is 0 m ² . It can be seen that the swirling flow is the main component simply by installing the mountain-shaped raised portion as the direction changing portion 50.
Moreover, the result about the comparative example 4 is shown in FIG.12 (b). In this example, the area occupied by the red region is 0.119 m ² . In the aspect in which only the bottom baffle as the partitioning portion 60 is installed, an upward flow is generated upward along the inner side wall 11c in many regions of the inner side wall 11c of the stirring tank 11 by the action of the bottom baffle. I understood it.
However, as shown in the streamline diagram of FIG. 12B, it can be seen that the streamline is greatly bent or twisted around the portion where the bottom baffle located immediately below the stirring blade 30 intersects. It can be seen that there is a concern that stagnation and accumulation of solid matter in the fluid may occur due to this streamline disturbance. Note that the flow velocity display in FIG. 12B is the same as in FIG.

In the stirring apparatus according to the present invention, stirring processes such as fluid mixing, dissolution, crystallization, reaction, and slurry suspension can be efficiently performed under an axial flow stirring operation.
For example, a nickel composite hydroxide, which is a precursor of a positive electrode active material for a secondary battery, is supplied with an aqueous solution containing a nickel salt, a neutralizing agent, and a complexing agent while stirring, and a crystallization reaction is performed. It can use suitably as a reaction container for obtaining with the manufacturing method.
As another application, in the chlorine leaching process in the electrical nickel production process, the nickel mixed sulfide as a raw material is subjected to chlorine leaching treatment with chlorine gas, and the resulting nickel leaching solution produces electrolytic nickel by electrowinning. , A reaction vessel that uses nickel mixed sulfide obtained by wet smelting treatment of nickel oxide ore as raw material, and oxidizes and leaches metal components such as nickel and copper with chlorine gas to produce chlorine leachate (copper-containing nickel chloride solution) It can be suitably applied to.

DESCRIPTION OF SYMBOLS 1 Stirring tank 1a Cavity part 1b Bottom part 1c Side wall 2 Rotating shaft 3 Stirring blade 4 Guide part 5 Direction change part 6 Partition part F Stir fluid 10 Stirrer 10 'Stirrer 11 Stirrer tank 11a Cavity part 11b Bottom part 11c Side wall 12 Lid member 20 Rotating shaft 30 Stirring blade 31 Blade support body 32 Blade member 40 Guide portion 50 Direction changing portion 51 Top portion 55 Multi-faceted planar surface portion 56 Projection portion 60 Partition portion 100 Baffle

Claims (8)

A stirring tank that has a bottomed substantially circular cavity with a cross-section and can contain a stirring fluid in the cavity;
A rotating shaft that hangs downward from approximately the center of the upper part of the stirring tank and is set to be in non-contact with the bottom of the stirring tank;
A stirring blade that is provided at a lower end of the rotating shaft, rotates together with the rotating shaft, stirs the stirring fluid in the stirring tank, and applies a downward flow to the stirring fluid;
A guide portion that is provided at the bottom of the agitation tank so as to be disposed in non-contact with the rotating shaft and the agitating blade, and guides the agitating fluid directed downward from the agitating blade toward the radially outer side of the rotating shaft. And comprising
The guide portion is provided in a portion of the bottom portion of the stirring tank that faces the stirring blade, and changes a flow direction of the stirring fluid directed downward from the stirring blade toward a radially outward direction of the rotating shaft. An agitation device comprising: a change unit; and a plurality of partition portions radially provided around the direction change unit and partitioning a region around the direction change unit into a plurality of regions. The stirrer according to claim 1,
The said direction change part is comprised as a protruding part which the substantially center part of the bottom part of the said stirring tank protruded in the shape of a mountain compared with the other part, The stirring apparatus characterized by the above-mentioned. The stirrer according to claim 2,
The stirring device according to claim 1, wherein the direction changing portion is a mountain-shaped ridge having an outer diameter larger than a blade diameter of the stirring blade. The stirrer according to claim 1,
The agitation apparatus is characterized in that three or more of the partition parts are installed at equiangular intervals around the direction changing part. The stirrer according to claim 1,
The agitation device according to claim 1, wherein the partition portion is provided so as to extend from a region inside the direction change unit to a region outside the direction change unit. The stirrer according to claim 1,
The partition device has a stirrer in which an upper edge position of the partition portion continuously changes obliquely downward toward a radially outward direction of the rotation shaft. The stirrer according to claim 1,
The agitation device according to claim 1, wherein the partition portion is located below a portion located at an uppermost position of the direction changing portion. The stirrer according to claim 1,
The said partition part has a part located above the part located in the uppermost part of the said direction change part in the area | region which faced the said direction change part, The stirring apparatus characterized by the above-mentioned.