JP7245594B1 - stirrer - Google Patents

Abstract

An object of the present invention is to provide a stirring device capable of suppressing excessive vortex generation while enhancing stirring performance. SOLUTION: A stirring device B1 includes a stirring tank 71 having a bottom part 711 and a side wall part 712, and a stirring blade A1 rotating around an axis in the stirring tank 71, wherein the stirring blade A1 rotates in a normal rotation direction F. and reverse direction R, arranged along the bottom 711 in the stirring vessel 71, and positioned in the forward rotation direction F as each moves outward in the radial direction r from the rotation center of the stirring blade A1. A plurality of baffles 76 are provided. [Selection drawing] Fig. 2

Description

The present invention relates to a stirring device.

2. Description of the Related Art A stirring device having stirring blades is used as a device for stirring, such as dispersing and mixing, a target object such as a liquid or a mixture of powder and liquid. Patent Literature 1 discloses an example of a conventional stirring device. In the configuration disclosed in this document, a stirring blade is attached to the tip of a rotating shaft that is driven to rotate. The stirring blade performs stirring such as dispersion and mixing of the target object by being rotated within the stirring container containing the target object.

The higher the viscosity of the target object, the more difficult it is to disperse and mix. In order to improve dispersion and mixing, it is necessary to increase the ability of the stirring blades to stir the target object. However, if the stirring ability of the stirring blades is increased, vortices due to the swirling flow are more likely to occur in the liquid object. Excessive eddying may impair the function of the stirrer.

JP 2006-205071 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stirrer capable of suppressing excessive vortex generation while increasing the stirring performance.

The stirring device provided by the present invention is a stirring device comprising a stirring tank having a bottom and a side wall, and a stirring blade rotating around an axis in the stirring tank, wherein the stirring blade rotates forward. and reverse directions, are arranged along the bottom in the stirring vessel, and are positioned in the normal rotation direction as they go radially outward from the rotation center of the stirring blades. , comprising a plurality of baffles, the plurality of baffles are arranged radially extending around the stirring blade , and the stirring blade rotates in either the forward direction or the reverse direction. , to generate a flow that advances outward in the radial direction from the stirring blade, or, when rotating in the normal rotation direction, generate a flow of the object to be stirred that advances obliquely downward in the axial direction from the stirring blade, and reverse rotation. When rotating in the direction, the flow of the object to be stirred progresses obliquely upward in the axial direction from the stirring blade, and the height of the plurality of baffles is the height overlapping the stirring blade when viewed from the radial direction. ( Claim 1).
Further, the stirring device provided by the present invention is a stirring device having a bottom portion and a side wall portion, and comprising a stirring tank containing an object to be stirred, and a stirring blade rotating around an axis in the stirring tank, The stirring blades rotate in both forward and reverse directions, are arranged along the bottom in the stirring tank, and each rotates radially outward from the center of rotation of the stirring blades. A plurality of baffles having a shape positioned in the rotation direction are provided, and the plurality of baffles are arranged radially extending around the stirring blade, and the stirring blade rotates in the normal rotation direction to achieve the stirring. When the flow to be stirred progresses obliquely upward in the axial direction from the blades and rotates in the reverse direction, the flow to be stirred is generated to progress obliquely downward in the axial direction from the stirring blades, and the plurality of The upper end of the baffle in the axial direction is positioned below the upper end of the stirring blade in the axial direction and is positioned above the lower end of the stirring blade in the axial direction (claim Item 2).
a pump tank located below the stirring tank; pump blades accommodated in the pump tank; a connecting conduit connecting the bottom portion and the pump tank; It is preferable to have a rotating shaft connected to the stirring blades and the pump blades (claim 3 ).
Further, it is preferable to provide a reflux line connected to the pump tank for returning the object to be stirred flowing out from the bottom of the stirring tank to the stirring tank via the outside of the stirring tank (claim 4 ). .

ADVANTAGE OF THE INVENTION According to this invention, generation|occurrence|production of an excessive vortex can be suppressed, increasing stirring capability.

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

1 is a cross-sectional view showing a stirring device according to a first embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1; 1 is a perspective view showing an example of a stirring blade of a stirring device according to a first embodiment of the present invention; FIG. FIG. 4 is a diagram showing an example of a flow state during normal rotation of the stirring device according to the first embodiment of the present invention; FIG. 5 is a diagram showing an example of a flow state when the stirrer according to the first embodiment of the present invention is reversed; FIG. 5 is a diagram showing an example of a flow state during forward rotation of the stirring device of the first comparative example. FIG. 4 is a diagram showing an example of the flow state during normal rotation and reverse rotation of the stirrer according to the embodiment of the present invention. FIG. 5 is a diagram showing an example of a flow state during forward rotation of the stirrer according to the embodiment of the present invention; FIG. 5 is a cross-sectional view showing a first modification of the stirring device according to the first embodiment of the present invention; FIG. 5 is a cross-sectional view showing a second modification of the stirring device according to the first embodiment of the present invention; FIG. 5 is a perspective view showing an example of a stirring blade of a stirring device according to a second embodiment of the present invention; FIG. 10 is a front view showing an example of a stirring blade of a stirring device according to a second embodiment of the present invention; [ Fig. 10] Fig. 10 is a plan view showing an example of a stirring blade of a stirring device according to a second embodiment of the present invention. FIG. 7 is a diagram showing an example of a flow state during forward rotation of the stirring device according to the second embodiment of the present invention; FIG. 7 is a diagram showing an example of a flow state when the stirring device according to the second embodiment of the present invention is reversed; FIG. 10 is a diagram showing an example of a flow state during normal rotation of the stirring device of the second comparative example; FIG. 11 is a cross-sectional view showing a stirring device according to a third embodiment of the present invention; FIG. 11 is a perspective view showing an example of a stirring blade of a stirring device according to a third embodiment of the present invention; FIG. 8 is a front view showing an example of a stirring blade of a stirring device according to a third embodiment of the present invention; FIG. 10 is a plan view showing an example of a stirring blade of a stirring device according to a third embodiment of the present invention; FIG. 19 is a cross-sectional view along line XIX-XIX in FIG. 18; FIG. 19 is a cross-sectional view along line XX-XX of FIG. 18; FIG. 10 is a diagram showing an example of a flow state during normal rotation of the stirrer according to the third embodiment of the present invention; FIG. 10 is a diagram showing an example of a flow state during reverse rotation of the stirring device according to the third embodiment of the present invention; FIG. 10 is a diagram showing an example of a flow state during forward rotation of the stirring device of the third comparative example;

Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

In the following description, stirring is a concept including dispersion and mixing. Dispersing a target object refers to the action of dispersing another substance (eg, liquid or powder) in a microscopic state in a substance (eg, liquid) that is chemically in one phase. Mixing the target object means an operation of stirring the target object in the container so that the target object contained in the container has a more uniform property.

<First embodiment>
1 and 2 show a stirring device according to a first embodiment of the invention. The stirring device B1 of this embodiment includes a stirring vessel 7, a stirring blade A1, a rotating shaft 4, and a motor 5.

[Stirring container 7]
The stirring container 7 is a container for accommodating a stirring target material (stirring target) 8 and stirring the stirring target material 8 . In this embodiment, the stirring container 7 has a stirring tank 71 , a lid portion 72 and a plurality of baffles 76 .

The stirring tank 71 is a main part that stores the stirring target material 8 and stirs the stirring target material 8 . Agitation tank 71 has a bottom portion 711 and a side wall portion 712 . The bottom portion 711 is the lower end portion of the stirring vessel 71, and in the illustrated example, has a curved shape that slightly bulges downward. However, the shape of the bottom portion 711 is not particularly limited, and may be flat. The side wall portion 712 extends upward from the bottom portion 711 and has a cylindrical shape. Note that the axial direction z in the drawing is parallel to the central axis of the cylindrical side wall portion 712 and corresponds to the vertical direction in this embodiment.

The lid portion 72 closes the stirring vessel 71 from above, and is for maintaining the airtightness of the stirring vessel 7, for example.

A plurality of baffles 76 are arranged along the bottom portion 711 within the stirring vessel 71 . Each of the plurality of baffles 76 is shaped so as to be positioned in the forward rotation direction F of the stirring blade A1 from the center in the radial direction r of the stirring vessel 71 toward the outer side in the radial direction r. Note that the center of the radial direction r of the stirring tank 71 of the present embodiment coincides with the rotating shaft 4, but when the center of the radial direction r of the stirring tank 71 and the rotating shaft 4 do not match, the radial direction r is rotated. Axis 4 is the coordinate axis. In the illustrated example, the baffle 76 has a concave curved surface located on the forward rotation direction F side of the stirring blade A1 and a convex curved surface located on the reverse rotation direction R side. The material of the baffle 76 is not particularly limited, and is made of metal such as stainless steel, for example. Further, the shape of the baffle 76 is not particularly limited, and may be a shape having a curved surface, a linear shape in plan view, or a curved shape.

In the illustrated example, the baffle 76 is rib-shaped and fixed over its entire length to the bottom 711 of the stirring tank 71 . Baffle 76 is fixed to bottom 711 by welding, for example. A method for fixing the baffle 76 is not particularly limited. Also, the baffle 76 may be detachable from the stirring vessel 71, for example. Alternatively, the baffle 76 may be indirectly fixed to the bottom 711 or the like of the stirring vessel 71 via another member.

The height of the baffle 76 is not particularly limited. The height of the baffle 76 may be appropriately set in accordance with the flow caused by the rotation of the stirring blade A1 from the viewpoint of achieving the effects described later. For example, when the illustrated stirring blade A1 mainly causes the flow along the radial direction r, the plurality of baffles 76 preferably overlap the stirring blade A1 when viewed from the radial direction. In the illustrated example, the upper end of the baffle 76 in the axial direction z (the end furthest from the bottom 711) is positioned above (from the bottom 711) the upper end of the stirring blade A1 (the end furthest from the bottom 711). The lower end of the baffle 76 (the end closest to the bottom 711) is positioned below (the side closer to the bottom 711) than the lower end of the stirring blade A1 (the end closest to the bottom 711). are doing.

The size of the baffle 76 in the radial direction r is not limited at all. In this embodiment, the size of the baffle 76 is less than half the radius of the bottom portion 711 in the radial direction r. That is, the plurality of baffles 76 are arranged within a half radius of the bottom portion 711 .
The number of baffles 76 is not particularly limited. In this embodiment, the number of baffles 76 is six. The six baffles 76 are arranged radially from the center of the stirring tank 71 in the radial direction r (rotating shaft 4) at equal pitches.

[Stirring blade A1]
The stirring blade A1 is for stirring the material to be stirred 8 contained in the stirring tank 71, and generates a flow such as a swirling flow capable of stirring the material to be stirred 8 by rotating. The stirring blade A1 rotates in both the forward rotation direction F and the reverse rotation direction R shown in FIG. In the following description, one direction in the circumferential direction θ corresponding to the central axis of the side wall portion 712 is the forward rotation direction F, and the other direction is the reverse rotation direction R. As the stirring blade, conventionally known blades having various configurations can be used, and examples thereof include so-called propeller type, paddle type, turbine type, cone type, and the like.

FIG. 3 shows a stirring blade A1, which is an example of the stirring blade used in this embodiment. The stirring blade A1 of this embodiment has a base portion 1 and a plurality of blade portions 2A and 2B. The base 1 is flat and disc-shaped. A plurality of blade portions 2A and 2B are arranged near the outer peripheral edge of the base portion 1 . The plurality of blade portions 2A are substantially trapezoidal flat plates that protrude upward in the axial direction z from the base portion 1 . The plurality of blade portions 2B are substantially trapezoidal flat plates projecting downward in the axial direction z from the base portion 1 . The plurality of blade portions 2A and the plurality of blade portions 2B are alternately arranged along the circumferential direction θ. Such a stirring blade A1 can be formed, for example, by cutting and bending a metal plate.

[Rotating shaft 4]
The rotating shaft 4 is a shaft for rotating the stirring blade A1. The rotary shaft 4 is inserted through the bottom portion 711 and is attached with the stirring blade A1. In the illustrated example, a stirring blade A1 is fixed to the upper end of the rotating shaft 4. As shown in FIG. In this embodiment, the center of the stirring tank 71 and the rotating shaft 4 are aligned, but they may not be aligned.

[Motor 5]
The motor 5 is a drive source that rotates the rotating shaft 4 . The motor 5 may be directly connected to the rotating shaft 4, or may be connected via a gear (not shown). The motor 5 rotates the rotary shaft 4 in both the forward rotation direction F and the reverse rotation direction R. As a result, the stirring blade A1 rotates in both the forward rotation direction F and the reverse rotation direction R.

Next, the action of the stirring device B1 will be described below with reference to FIGS. 4 to 8. FIG.

4 and 5 show an example of the flow state of the stirrer B1. In the illustrated fluidized state, the stirring tank 71 contains the material 8 to be stirred. The stirring target material 8 is a target object to be stirred by the stirring device B1. The type of the material to be stirred 8 is not particularly limited, and examples thereof include one type of liquid, a mixture of a plurality of types of liquids, and a mixture of any of these and a solid such as powder. The illustrated example of the flow state is the result of fluid analysis under the condition that water is adopted as the material 8 to be stirred and the peripheral speed of the stirring blade A1 is 20 m/s. 4 shows a case where the stirring blade A1 is rotated in the forward rotation direction F, and FIG. 5 shows a case where the stirring blade A1 is rotated in the reverse rotation direction R. As shown in FIG. Moreover, FIG. 6 shows the analysis result of the flow state of the first comparative example X1. The first comparative example X1 differs from the stirring device B1 in the fluid state shown in FIG. The point that it rotates in the direction F is the same.
4 to 6 omit an air intake vortex, which will be described later, for the sake of convenience.

Even when the stirring blade A1 rotates in either the forward rotation direction F or the reverse rotation direction R, a flow radially advancing in the radial direction r is generated as shown in FIG. This flow has velocity vectors in the forward rotation direction F and the reverse rotation direction R, corresponding to the rotation direction of the stirring blade A1. As a result, when the stirring blade A1 rotates in the forward rotation direction F, the flow Cf of the material to be stirred 8 discharged from the stirring blade A1 does not interfere with the baffle, as shown in FIG. rotates in the reverse direction R, the flow Cr of the material to be stirred 8 discharged from the stirring blade A1 interferes with the baffle as shown in FIG. 7(b). This point also applies to a second embodiment and a third embodiment, which will be described later.
Further, this flow includes a flow proceeding obliquely upward and obliquely downward in the axial direction z from the agitation blade A1 due to the shape of the agitation blade A1 described above. However, all of these flows are angled so as to pass through the region in which the plurality of baffles 76 are provided in the axial direction z.

The area hatched with dots in FIG. 4 indicates an area where the flow velocity vector is in the forward rotation direction F and the rotation speed is 150 r/min or more as a result of the fluid analysis. The region where the strong swirling flow in the forward rotation direction F is generated includes a plurality of baffles 76 and reaches the liquid surface of the material to be stirred 8 in the axial direction z. That is, a strong swirling flow in the forward rotation direction F is generated in the region near the center of the stirring vessel 71 .

On the other hand, in FIG. 5, the dot-shaped hatching (hatching darker than in FIG. 4) indicates the region where the flow velocity vector is in the reverse direction R and the rotational speed is 150 r/min or more as a result of the fluid analysis. The region where the fast flow rotating in the reverse direction R is generated is very close to the stirring blade A1 and generally remains in the region where the plurality of baffles 76 are arranged in the axial direction z and radial direction r.

Here, in the first comparative example X1 shown in FIG. 6, as in FIG. 4, a region where the flow velocity vector is in the forward rotation direction F and the rotational speed is 150 r/min or more is hatched. A strong swirling flow in the forward rotation direction F is generated in most of the material 8 to be stirred in the stirring tank 71 by the stirring blade A1 rotating in the forward rotation direction F.

Comparing the flow state shown in FIG. 4 with the flow state shown in FIG. A strong swirling flow in the forward rotation direction F is generated in a relatively large area extending from . This is because the plurality of baffles 76 are inclined with respect to the radial direction r so that they are located in the normal rotation direction F as they go outward in the radial direction r. That is, the flow Cf generated (discharged) from the stirring blade A1 rotating in the forward rotation direction F advances in the forward rotation direction F while heading outward in the radial direction r. This flow follows the shape of the plurality of baffles 76 as shown in FIG. 7(a), and the plurality of baffles 76 do not excessively obstruct (interfere) this flow. Therefore, even in the flow state shown in FIG. 4, a strong swirling flow in the normal rotation direction F is generated in a large area.

On the other hand, in the flow state shown in FIG. 5, the region where the strong swirl flow in the reverse direction R is generated is significantly smaller than the region where the strong swirl flow in the forward direction F is generated as shown in FIG. The flow generated from the stirring blade A1 rotating in the reverse direction R advances in the reverse direction R while heading outward in the radial direction r. On the other hand, the plurality of baffles 76 have a shape inclined with respect to the radial direction r so as to be positioned in the normal rotation direction F as they go outward in the radial direction r. Therefore, as shown in FIG. 7B, the flow Cr generated from the stirring blade A1 rotating in the reverse direction R interferes with the baffle 76, and the plurality of baffles 76 suppress (obstruct) the flow Cr generated from the stirring blade A1. ). As a result, the area where the strong swirling flow in the reverse direction R is generated is considered to have decreased. In addition, in the region where a strong swirl flow in the forward rotation direction F shown in FIG. It is thought that it does not differ greatly from the area. From this also, it can be said that the plurality of baffles 76 fulfill the function of conspicuously suppressing the swirling flow Cr in the reverse direction R.

As described above, in the stirrer B1 having a plurality of baffles 76, when the stirring blade A1 is rotated in the forward rotation direction F, a strong swirl in the forward rotation direction F is applied to a relatively wide area of the material to be stirred 8. When a flow is generated and the stirring blade A1 is rotated in the reverse direction R, it is possible to confine a strong swirling flow in the reverse direction R in a relatively narrow region of the material 8 to be stirred. For example, when the material 8 to be stirred is highly viscous or requires high degree of dispersion and mixing, stirring with the stirring blade A1 rotated in the forward rotation direction F is preferable. On the other hand, if the material to be stirred 8 has a low viscosity, or the air sucking vortex generated downward from the center of the liquid surface of the material to be stirred 8 contained in the stirring tank 71 is prevented from reaching the stirring blade A1. In this case, it is preferable to stir by rotating the stirring blade A1 in the reverse direction R.
In general, when the stirring target material 8 is processed by setting the peripheral speed of the stirring blade A1 to a certain value or higher, the stirring target material 8 flows in a swirling manner in the stirring tank 71 as shown in FIG. An air-sucking vortex is generated downward from the center of the liquid surface, and the flow that generates this air-sucking vortex functions to lower the material to be stirred 8 near the liquid surface toward the bottom of the agitating vessel 71. For example, when dissolving powder that has a small specific gravity and tends to float near the liquid surface, the powder is drawn to the vicinity of the stirring blade A1 at the bottom of the stirring tank 71 where the shear force acts most strongly, and the powder is dissolved. It has the advantage of being efficient.
On the other hand, if the peripheral speed of the stirring blade A1 is increased in order to apply a higher shearing force to the material 8 to be stirred, the air-sucking vortex will develop excessively and the bottom end of the vortex will be It reaches the vicinity of the stirring blades at the bottom of the stirring tank 71 . As a result, there occurs a state in which the material to be stirred 8 is not sufficiently present near the stirring blade A1 at the bottom of the stirring tank 71 where the shear force acts most strongly, and the effects of dispersion, emulsification, dissolution, and atomization on the material to be stirred 8 are remarkable. Problems of lowering will arise.
On the other hand, according to the stirring device B1, the stirring blade A1 is rotated in the forward rotation direction F to generate an air-sucking vortex downward from the center of the liquid surface, and the powder having a small specific gravity and easily floating near the liquid surface is generated. After drawing the powder so that it reaches the vicinity of the stirring blade A1 at the bottom of the stirring tank 71 where the strongest shear force acts on the powder, the stirring blade A1 is rotated in the reverse direction R so that the lower end of the air intake vortex While avoiding reaching the vicinity of the stirring blade A1, the material 8 to be stirred can be processed by adding a higher shearing force.
As described above, according to the stirring device B1, it is possible to suppress the generation of excessive vortices while increasing the stirring capacity. Note that the above points also apply to second and third embodiments described later.

The baffle 76 of this embodiment has an upper end in the axial direction z located above the upper end of the stirring blade A1, and a lower end in the axial direction z located below the lower end of the stirring blade A1. Thereby, it is possible to more reliably direct the flow generated by the stirring blade A 1 to the plurality of baffles 76 . In particular, when the stirring blade A1 is rotated in the reverse direction R, the flow from the stirring blade A1 is more positively directed toward the plurality of baffles 76, and the region where the swirling flow in the reverse direction R occurs is intentionally Good to keep down.

Figures 9-25 show variations and other embodiments of the present invention. In these figures, the same or similar elements as in the above embodiment are denoted by the same reference numerals as in the above embodiment.

<First embodiment, first modification>
FIG. 9 shows a first modification of the stirring device B1. In the stirring device B11 of this modified example, the shape of the plurality of baffles 76 is different from the baffles 76 of the stirring blade A1 described above.

In this modification, the baffle 76 is linear in plan view. However, also in this modified example, the baffle 76 is inclined with respect to the radial direction r so as to be positioned in the forward rotation direction F as it goes outward in the radial direction r from the center in the radial direction r.

According to this modified example as well, it is possible to suppress the generation of excessive vortices while enhancing the stirring capability. Also, as understood from this modified example, the shape of the plurality of baffles 76 is not limited at all.
It should be noted that this modification can be similarly applied to a second embodiment and a third embodiment, which will be described later.

<First Embodiment, Second Modification>
FIG. 10 shows a second modification of the stirring device B1. The stirring device B12 of this modification further includes pump blades 3 . In addition to the stirring vessel 71 , the stirring vessel 7 also has a pump vessel 73 , a connecting pipeline 74 and a reflux pipeline 75 .

The pump tank 73 is provided below the stirring tank 71 and has, for example, a flat cylindrical shape. The center of the pump tank 73 in plan view coincides with the center of the stirring tank 71 in plan view.

The connecting pipe line 74 connects the bottom portion 711 of the stirring tank 71 and the pump tank 73 . The connecting pipe line 74 has a short tubular shape, and its center in plan view coincides with the center in plan view of the stirring tank 71 and the pump tank 73 .

The reflux line 75 is a path for returning the liquid that has flowed out from the bottom portion 711 to the stirring tank 71 via the outside of the stirring tank 71 . The return line 75 is connected to the side of the pump tank 73 . In the illustrated example, the return line 75 has a side injection port 751 , a top injection port 752 , a spraying portion 753 and a valve portion 754 .

The side injection port 751 is connected to the side wall portion 712 of the stirring tank 71 and is a part through which the recirculated liquid flows into the stirring tank 71 from the side.

The top-side injection port 752 is provided above the stirring tank 71 , and in the illustrated example, is provided through the lid portion 72 . The top-side injection port 752 is a portion through which the recirculated liquid flows into the stirring tank 71 from above.

The spraying part 753 is attached to the top-side injection port 752 and has a function of washing the inside of the stirring tank 71 by spraying the liquid flowing from the top-side filling port 752 into the stirring tank 71 . It is a shower ball (washing nozzle).

The valve part 754 is for selectively returning the liquid to either the side injection port 751 or the top injection port 752, and is configured by a three-way valve or the like, for example.

The pump vanes 3 are for sucking the liquid in the stirring vessel 71 through the connecting conduit 74 and sending it to the reflux conduit 75 . The pump impeller 3 rotates in the forward rotation direction F and the reverse rotation direction R while being accommodated in the pump tank 73 . The pump impeller 3 is attached to the rotating shaft 4 .
The pump blades 3 preferably have a blade shape that allows the liquid in the stirring vessel 71 to be sent to the reflux line 75 in either the forward rotation direction F or the reverse rotation direction R.

The illustrated example is an example using a centrifugal pump as the pump impeller 3 . Such a pump blade 3 has, for example, a main plate 31 and a plurality of blade plates 32 . The main plate 31 is, for example, a disk-shaped member and is made of metal such as stainless steel. The plurality of blade plates 32 are made of metal such as stainless steel, and are fixed to the upper surface of the main plate 31 .

A usage example of the stirring device B12 will be described. First, the case where normal stirring is performed in the stirring device B12 will be described. In this case, the valve portion 754 opens the path toward the side inlet 751 and closes the path toward the top inlet 752 . That is, the path P1 in the drawing is selected. Simultaneously with the stirring by the stirring blades A1, the rotation of the pump blades 3 causes the stirring target material 8 to be sucked from the center of the pump blades 3, and the stirring target materials 8 are sucked into the return pipe 75 located radially outward of the pump blades 3. Dispensed. The material 8 to be stirred is injected into the stirring tank 71 from the side injection port 751 through the return line 75 . This circulation of the object material 8 can prevent the object material 8 from stagnating in the agitation tank 71 .
As a result, the stirring blade A1 is rotated in the reverse direction R to prevent the lower end of the air-sucking vortex from reaching the vicinity of the stirring blade A1, while applying a higher shearing force to the material 8 to be stirred. It is possible to overcome the problem that the area where the swirling flow occurs during treatment becomes significantly smaller than the area where the swirling flow occurs when the stirring blade A1 is rotated in the forward rotation direction F.

Next, the case of cleaning the stirring container 7 in the stirring device B12 will be described. In this case, the valve portion 754 closes the path toward the side inlet 751 and opens the path toward the top inlet 752 . That is, the path P2 in the drawing is selected. Further, instead of the material 8 to be stirred, the stirring tank 71 contains a cleaning liquid. The cleaning liquid is a liquid for cleaning the material to be stirred 8 and the like adhering to the inside of the stirring container 7 . By rotating the motor 5 in this state, the stirring blade A1 and the pump blade 3 are rotated. As a result, the cleaning liquid 9 stored in the stirring tank 71 is caused to swirl by the stirring blades A1, and the cleaning liquid 9 is sent to the top-side injection port 752 through the reflux pipe 15 by the pump blades 3. The spray is sprayed toward the entire interior of the stirring container 7 from a spraying portion (shower ball) 753 arranged at the tip.

Here, in order to sufficiently wash the stirring container 7 with the washing liquid, it is necessary to increase the rotational speed of the pump blades 3 to increase the discharge pressure of the washing liquid 9 from the spraying portion (shower ball) 753 . However, when the rotation speed of the pump blades 3 is increased, the rotation speed (peripheral speed) of the stirring blades A1 connected to the pump blades 3 via the rotating shaft 4 also increases, and accordingly, the air in the stirring tank 71 increases. The suction vortex develops excessively and its lower end reaches the pump blades 3 .
As a result, the discharge pressure of the cleaning liquid 9 from the spraying portion 753 is lowered, and the cleaning of the inside of the stirring container 7 with the cleaning liquid 9 becomes insufficient.
On the other hand, in the stirring device B12, by rotating the stirring blade A1 in the reverse direction R, it is possible to prevent the lower end of the air sucking vortex from reaching the pump blade 3. be able to do enough
It should be noted that this modification can be similarly applied to a second embodiment and a third embodiment, which will be described later.

<Second embodiment>
11 to 13 show a stirring device according to a second embodiment of the invention. The stirring device B2 of the present embodiment differs from the stirring device B1 in that it has a stirring blade A2 instead of the stirring blade A1. As shown in FIGS. 11 to 13, the stirring blade A2 has a base portion 1 and a plurality of blade portions 2. As shown in FIGS. The material of the stirring blade A2 is not particularly limited, and a material suitable for dispersion and mixing is appropriately selected. A preferred metal for the stirring blade A2 is, for example, stainless steel.

Further, the stirring blade A2 may be formed by integrally forming the base portion 1 and the plurality of blade portions 2, or may be configured by combining a plurality of parts. Furthermore, as a structure for attaching the stirring blade A2 to the rotating shaft 4 of the stirring device B1, various attachment mechanisms such as an engaging mechanism and a fastening mechanism may be adopted, and at least a part of the rotating shaft 4 and the stirring blade A2 may be used. and may be integrally formed. 11 to 13, the structure for attaching the stirring blade A2 to the rotating shaft 4 is omitted for convenience of understanding. The size of the stirring blade A2 is not particularly limited, and the diameter of the stirring blade A2 can be set to about 40 to 300 mm.

The base 1 is a part that supports a plurality of blades 2 and is fixed to the rotating shaft 4 . The shape and size of the base 1 are not particularly limited. The base 1 of this embodiment has a circular shape when viewed in the axial direction z. The base 1 has an outer peripheral edge 10 and an inclined surface 11 . The outer peripheral end 10 is the outermost portion in the radial direction r. In this embodiment, the outer peripheral end 10 is positioned at the lower end of the base portion 1 in the axial direction z, and has a circular shape when viewed in the axial direction z. The inclined surface 11 is provided above the outer peripheral end 10 in the axial direction z. The inclined surface 11 is inclined so as to be located outward in the radial direction r toward the outer peripheral end 10 in the axial direction z. In the illustrated example, the entire base 1 is conical, and the inclined surface 11 is constituted by the flanks of the conical body.

The plurality of blade portions 2 are positioned on one side in the axial direction z with respect to the base portion 1 and arranged in the circumferential direction θ. In this embodiment, the plurality of blade portions 2 are provided on the inclined surface 11 . As shown in FIG. 12, the plurality of blade portions 2 are arranged within a predetermined range in the axial direction z.

The number of blade portions 2 is not particularly limited. In this embodiment, the number of blade portions 2 is four. Moreover, the four blade portions 2 are arranged at an equal pitch, and in the illustrated example, the pitch is 90 degrees.

The vane 2 has an inner end 21a, an outer end 22a, a root end 23a, a tip 24a, a front surface 25a, a rear surface 26a, a front curved portion 27a and a rear curved portion 28a. The inner end 21a is an end portion of the blade portion 2 that is positioned furthest inward in the radial direction r. In this embodiment, the inner ends 21a of the plurality of blade portions 2 are separated from each other in the circumferential direction θ. The outer end 22a is the end of the blade portion 2 that is positioned furthest outward in the radial direction r. As shown in FIG. 11, in the illustrated example, the outer end 22a coincides with the outer peripheral end 10 of the base 1 when viewed in the axial direction z. That is, neither the base portion 1 nor the blade portion 2 is configured to protrude outward in the radial direction r. However, the blade portion 2 may be configured to protrude radially outward from the base portion 1 or may be retracted radially inward from the base portion 1 .

The base end 23 a is a portion where the blade portion 2 is connected to the base portion 1 . The tip 24a is an end portion of the blade portion 2 spaced apart from the root end 23a in the axial direction z.

The front surface 25a is a surface of the blade portion 2 facing the forward rotation direction F. As shown in FIG. The rear surface 26a is a surface of the blade portion 2 facing the reverse rotation direction R. As shown in FIG.

The front curved portion 27a is a portion that is connected to the inner end 21a and is convex in the forward rotation direction F when viewed in the axial direction z. More specifically, the front curved portion 27a has a shape that is convex in the forward rotation direction F from an imaginary straight line connecting both ends in the radial direction r of the front curved portion 27a. The rear curved portion 28a is a portion that is connected to the front curved portion 27a outward in the radial direction r and is convex in the reverse direction R when viewed in the axial direction z. More specifically, the rear curved portion 28a has a shape that is convex in the reverse rotation direction R from an imaginary straight line connecting both ends in the radial direction r of the rear curved portion 28a. In FIGS. 11 and 13, the respective ranges of the front curved portion 27a and the rear curved portion 28a are indicated by dashed-dotted arrows for convenience of understanding. In the illustrated example, the tip 24a is provided at a portion of the blade portion 2 that generally constitutes the front curved portion 27a, and as shown in FIG. It has a certain shape. Further, the proximal end 23a is provided at both the portions forming the front curved portion 27a and the rear curved portion 28a, and as shown in FIG. 13, has an S shape when viewed in the axial direction z. In addition, the range in which the front curved portion 27a and the rear curved portion 28a are provided, the degree of each curve, and the like are not particularly limited.

Further, in the present embodiment, the blade portion 2 is inclined so as to be positioned in the forward rotation direction F as it is separated from the base portion 1 in the axial direction z. Furthermore, in the present embodiment, the angle of inclination of the blades 2 with respect to the axial direction z increases inward in the radial direction r. More specifically, as shown in FIG. 12, an angle γ1, which is the angle formed by the inner end 21a of the blade 2 with the axial direction z, is the angle formed by the outer end 22a of the blade 2 with the axial direction z. , which is larger than the angle γ2. In other words, the angle that the front curved portion 27a makes with the axial direction z is greater than the angle that the back curved portion 28a makes with the axial direction z.

Also in this embodiment, the upper end of the baffle 76 in the axial direction z is located above the upper end of the stirring blade A2, and the lower end of the baffle 76 is located below the lower end of the stirring blade A2. there is

Next, the action of the stirring device B2 will be described below with reference to FIGS. 14 to 16. FIG.

14 and 15 show an example of the flow state of the stirrer B2. The illustrated example of the flow state is the result of fluid analysis under the condition that water is adopted as the material 8 to be stirred and the peripheral speed of the stirring blade A2 is 20 m/s. 14 shows the case where the stirring blade A2 is rotated in the forward rotation direction F, and FIG. 15 shows the case where the stirring blade A2 is rotated in the reverse rotation direction R. As shown in FIG. Moreover, FIG. 16 has shown the analysis result of the flow state of the 2nd comparative example X2. The second comparative example X2 differs from the stirring device B2 in the fluid state shown in FIG. 14 only in that the stirring vessel 7 does not have a plurality of baffles 76. The point that it rotates in the direction F is the same.
14 to 16 omit the air intake vortex for the sake of convenience.

When the stirring blade A2 rotates in the forward rotation direction F, as shown in FIGS. 14 and 16, it generates a flow that advances obliquely downward in the axial direction z. Further, when the stirring blade A2 rotates in the reverse direction R, as shown in FIG. 15, it generates a flow that advances obliquely upward in the axial direction z.

The area hatched in dots in FIG. 14 indicates the area where the flow velocity vector is in the forward rotation direction F and the rotational speed is 150 r/min or more as a result of the fluid analysis. The region where the strong swirling flow in the normal direction F is generated includes a plurality of baffles 76 and reaches the liquid surface of the material 8 to be stirred in the axial direction z. In other words, a strong swirling flow in the forward rotation direction F is generated in a large area near the center of the stirring tank 71 .

On the other hand, in FIG. 15, the dot-shaped hatching (hatching darker than in FIG. 14) indicates the region where the flow velocity vector is in the reverse direction R and the rotational speed is 150 r/min or more as a result of the fluid analysis. The region where the flow rotating in the reverse direction R is generated is in the immediate vicinity of the stirring blade A2 and generally remains in the region where the plurality of baffles 76 are arranged in the radial direction r, and the plurality of baffles 76 in the axial direction z. This is an area that protrudes slightly upward from the

Here, in the second comparative example X2 shown in FIG. 16, as in FIG. 14, the region where the flow velocity vector is in the forward rotation direction F and the rotational speed is 150 r/min or more is hatched. A strong swirling flow in the forward rotation direction F is generated in most of the material to be stirred 8 in the stirring tank 71 by the stirring blade A2 rotating in the forward rotation direction F. As shown in FIG.

In the flow state shown in FIG. 14, the plurality of baffles 76 have a shape inclined with respect to the radial direction r so as to be positioned in the forward rotation direction F as they go outward in the radial direction r. A strong swirling flow in the normal rotation direction F is generated. On the other hand, in the flow state shown in FIG. 15, the region where the strong swirl flow in the reverse rotation direction R is generated is significantly smaller than the region where the strong swirl flow in the forward rotation direction F is generated as shown in FIG. It is believed that this is because, as in the first embodiment, the plurality of baffles 76 suppress the flow generated from the stirring blade A2 rotating in the reverse direction R, and the area where the swirling flow in the reverse direction R is generated is reduced. . In addition, in the region where the strong swirl flow in the forward rotation direction F shown in FIG. It is thought that it does not differ greatly from the area. From this also, it can be said that the plurality of baffles 76 fulfill the function of conspicuously suppressing the swirling flow in the reverse direction R. As shown in FIG.

As described above, the stirring device B2 can also suppress the occurrence of excessive air-sucking vortices while increasing the stirring capacity. In addition, a strong swirling flow in the forward rotation direction F can be generated in a wider area of the material 8 to be stirred in the stirring vessel 7 by the stirring blade A2 that generates a flow that advances obliquely downward in the rotation in the forward rotation direction F. can. In addition, although a flow that advances obliquely upward is generated in the rotation in the reverse direction R, the upper end of the baffle 76 in the axial direction z is located above the upper end of the stirring blade A2, and the lower end of the baffle 76 is located above the stirring blade. By being positioned below the lower end of A2, it is possible to intentionally suppress a region where a strong swirling flow in the reverse direction R occurs.

<Third Embodiment>
17 to 21 show a stirring device according to a third embodiment of the invention. The stirring device B3 of the present embodiment differs from the stirring devices B1 and B2 in that a stirring blade A3 is provided instead of the stirring blades A1 and A2. In addition, as will be described later, the position and size relationship between the stirring blade A3 and the plurality of baffles 76 in the axial direction z are different. As shown in FIGS. 18 to 21, the stirring blade A3 has a base portion 1 and a plurality of blade portions 2. As shown in FIGS. The material of the stirring blade A3 is not particularly limited, and a material suitable for dispersion and mixing is appropriately selected. A preferred metal for the stirring blade A3 is, for example, stainless steel.

In the stirring blade A3, a mounting hole 19 is provided in the base portion 1 as a structure for mounting the stirring blade A3 on the rotating shaft 4. As shown in FIG. The size of the stirring blade A3 is not particularly limited, and the diameter of the stirring blade A3 can be set to about 40 to 370 mm.

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

Base 1 has an upper surface 13 and a lower surface 14 . The upper surface 13 is a surface of the base 1 facing upward in the axial direction z. The lower surface 14 is a surface of the base 1 facing downward in the axial direction z.

In this embodiment, the number of blade portions 2 is three, but the number is not limited to this. The blade portion 2 has a root portion 21b and a tip portion 22b. The root portion 21b is connected to the base portion 1 and obliquely extends upward in the axial direction z with respect to the base portion 1 . The tip portion 22b is connected to the root portion 21b on the side opposite to the base portion 1, and extends upward in the axial direction z from the root portion 21b in the illustrated example. The base portion 1, the root portion 21b, and the tip portion 22b may be integrally formed from a single material, or may be joined together using an engagement (fitting) method such as insertion or a joining method such as welding. may have been

In the stirring blade A3, the base portion 1 and the blade portion 2 are formed by cutting and bending an integral metal plate material. Therefore, a first boundary portion 23b is provided at the boundary between the base portion 1 and the root portion 21b, and a second boundary portion 24b is provided at the boundary between the root portion 21b and the tip portion 22b.

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

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

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

In this embodiment, the first angle α1 shown in FIG. 22 is defined. A horizontal dashed line in the figure is a straight line along the circumferential direction θ. The first angle α1 is an angle between the circumferential direction θ and the root portion 21b (the center line of the root portion 21b), and is positioned downward in the axial direction z toward the forward rotation direction F in the circumferential direction θ. Positive when tilted.

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

Further, in this embodiment, a second angle α2 and a third angle α3 shown in FIG. 21 are defined. A horizontal dashed-dotted line in the figure is a straight line along the radial direction r. A straight dashed-dotted line extending along the root portion 21b is an average centerline based on the overall shape of the root portion 21b. In the illustrated example, the root portion 21b has a linear cross section extending obliquely in the figure. Therefore, the center line of the root portion 21 b is a straight line positioned between the inner surface 211 and the outer surface 222 . A straight dashed-dotted line extending along the tip portion 22b is an average center line based on the overall shape of the tip portion 22b. In the illustrated example, the tip portion 22b has a linear cross section extending obliquely in the figure. Therefore, the center line of the tip portion 22b is a straight line positioned between the inner surface 221 and the outer surface 222. As shown in FIG. Note that even if the base portion 21b and the tip portion 22b have a shape in which they are gently bent or curved, a geometrically average centerline may be appropriately determined based on the overall shape.

The second angle α2 is an angle formed by the radial direction r and the root portion 21b (the center line of the root portion 21b). do. The second angle α2 is an angle corresponding to a so-called elevation angle. When the root portion 21b is parallel to the radial direction r, the second angle α2 is 0°. The third angle α3 is an angle formed by the root portion 21b (the center line of the root portion 21b) and the tip portion 22b (the center line of the tip portion 22b). It is positive when it tilts so as to The third angle α3 is an angle corresponding to a so-called elevation angle. When the tip 22b is parallel to the radial direction r, the third angle α3 is 0°.

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

Moreover, in this embodiment, a first minor angle β1 and a second minor angle β2 shown in FIG. 20 are defined. In the drawing, the dashed-dotted arrow line extending along each blade portion 2 is the direction in which the blade portion 2 extends (the radial direction r that coincides with the direction in which the blade portion 2 extends). The dashed-dotted straight line extending along the first boundary portion 23b is the average center line based on the overall shape of the first boundary portion 23b. In the illustrated example, the first boundary portion 23b has a linear shape. Therefore, the center line of the first boundary portion 23b is a straight line that overlaps the entire first boundary portion 23b. The dashed-dotted straight line extending along the second boundary portion 24b is an average center line based on the overall shape of the second boundary portion 24b. In the illustrated example, the second boundary portion 24b is linear. Therefore, the center line of the second boundary portion 24b is a straight line that overlaps the entire second boundary portion 24b. Note that even if the first boundary portion 23b and the second boundary portion 24b have a shape that is gently bent or curved, if a geometrically average center line is appropriately determined based on the overall shape, good.

The first minor angle β1 is an angle formed by the radial direction r (the dashed-dotted arrow) and the first boundary portion 23b (the center line of the first boundary portion 23b) when viewed in the axial direction z. When the first boundary portion 23b is along the circumferential direction θ and perpendicular to the radial direction r, the first minor angle β1 is 90°. The second minor angle β2 is an angle formed by the radial direction r (the dashed-dotted arrow) and the second boundary portion 24b (the center line of the second boundary portion 24b) when viewed in the axial direction z. If the second boundary 24b is along the circumferential direction θ and perpendicular to the radial direction r, the second minor angle β2 is 90°. In addition, the first minor angle β1 and the second minor angle β2 are set in the forward rotation direction F in the circumferential direction θ as the first boundary portion 23b and the second boundary portion 24b go outward in the radial direction r when viewed in the axial direction z. It takes a positive value if it is tilted into position and a negative value if it is vice versa.

In this embodiment, the first minor angle β1 is 20° or more and 80° or less. Also, the second minor angle β2 is greater than the first minor angle β1.

As shown in FIG. 17, the upper ends of the plurality of baffles 76 in the axial direction z (the ends furthest from the bottom 711) of the present embodiment are the upper ends of the stirring blades A3 in the axial direction z (the ends furthest from the bottom 711). part) (the side closer to the bottom 711), and the lower end of the stirring blade A3 (the end closest to the bottom 711) (the side away from the bottom 711). . In addition, the lower ends of the plurality of baffles 76 in the axial direction z are positioned lower than the lower ends of the stirring blades A3 in the axial direction z. That is, in this embodiment, a portion of the stirring blade A3 is arranged to protrude upward in the axial direction z from the plurality of baffles 76 .

Next, the action of the stirring device B3 will be described below with reference to FIGS. 23 to 25. FIG.

23 and 24 show examples of the flow state of the stirrer B3. The illustrated example of the flow state is the result of fluid analysis under the condition that water is adopted as the material 8 to be stirred and the peripheral speed of the stirring blade A3 is 20 m/s. 23 shows the case where the stirring blade A3 is rotated in the forward rotation direction F, and FIG. 24 shows the case where the stirring blade A3 is rotated in the reverse rotation direction R. As shown in FIG. Moreover, FIG. 25 shows the analysis result of the flow state of the third comparative example X3. The third comparative example X3 differs from the stirring device B3 in the fluid state shown in FIG. 23 only in that the stirring vessel 7 does not have a plurality of baffles 76. The point that it rotates in the direction F is the same.
23 to 25 omit the air intake vortex for the sake of convenience.

When the stirring blade A3 rotates in the forward rotation direction F, as shown in FIGS. 23 and 25, it generates a flow that advances obliquely upward in the axial direction z. Further, when the stirring blade A3 rotates in the reverse direction R, as shown in FIG. 24, it generates a flow that advances diagonally downward in the axial direction z.

In FIG. 23, the area hatched with dots indicates the area where the flow velocity vector is in the forward rotation direction F and the rotation speed is 150 r/min or more as a result of the fluid analysis. The region where the strong swirling flow in the normal direction F is generated includes a plurality of baffles 76 and reaches the liquid surface of the material 8 to be stirred in the axial direction z. In other words, a strong swirling flow in the forward rotation direction F is generated in a large area near the center of the stirring tank 71 .

On the other hand, in FIG. 24, the dot-shaped hatching (hatching darker than in FIG. 23) indicates a region where the flow velocity vector is in the reverse direction R and the rotational speed is 150 r/min or more as a result of the fluid analysis. The region where the fast flow rotating in the reverse direction R is generated is very close to the stirring blade A3 and generally stays in the region where the plurality of baffles 76 are arranged in the radial direction r.

Here, in the third comparative example X3 shown in FIG. 25, as in FIG. 23, the region where the flow velocity vector is in the forward rotation direction F and the rotational speed is 150 r/min or more is hatched. A strong swirling flow in the forward rotation direction F is generated in most of the material to be stirred 8 in the stirring tank 71 by the stirring blade A3 rotating in the forward rotation direction F. As shown in FIG.

As shown in FIG. 23, when the stirring blade A3 rotates in the forward rotation direction F, a plurality of baffles 76 are provided with respect to the stirring blade A3 in response to the flow proceeding obliquely upward from the stirring blade A3. It is arranged at a position shifted downward in the axial direction z. Therefore, most of the flow from the stirring blade A3 does not go to the plurality of baffles 76, but passes above the plurality of baffles 76 in the axial direction z. Therefore, a strong swirling flow in the forward rotation direction F is generated in a large area of the object material 8 to be stirred.
On the other hand, as shown in FIG. 24, when the stirring blade A3 rotates in the reverse direction R, the plurality of baffles 76 are arranged at positions shifted downward in the axial direction z with respect to the stirring blade A3. First, the region in which a strong swirl flow in the reverse direction R is generated in the flowing state is significantly smaller than the region in which a strong swirl flow in the forward rotation direction F is generated as shown in FIG. When the stirring blade A3 rotates in the reverse direction R, a flow proceeding obliquely downward is generated from the stirring blade A3. be done. As a result, it is considered that the swirling flow in the reverse direction R was suppressed. In addition, in the region where a strong swirling flow in the forward rotation direction F is generated shown in FIG. It is thought that it does not differ greatly from the area. From this also, it can be said that the plurality of baffles 76 fulfill the function of conspicuously suppressing the swirling flow in the reverse direction R. As shown in FIG.

As described above, the stirring device B3 can also suppress the generation of excessive air-sucking vortices while increasing the stirring capacity. In addition, the extent to which the stirring blades A3, which generate a flow that advances obliquely upward when rotated in the forward rotation direction F, protrudes upward in the axial direction z from the plurality of baffles 76 is is positioned lower than the upper end of the stirring blade A3 in the axial direction z in that the flow from the stirring blade A3 that interferes with the baffle 76 can be reliably reduced.
In addition, the excessive protrusion of the stirring blade A3 upward in the axial direction z from the plurality of baffles 76 interferes with the baffle 76 when the stirring blade A3 is rotated in the reverse direction R. Since the direction flow decreases and the effect of intentionally suppressing the region where the swirl flow in the reverse direction R is generated decreases, the upper ends of the plurality of baffles 76 in the axial direction z are positioned above the lower ends of the stirring blades A3. preferably located.

The stirring device according to the present invention is not limited to the embodiments described above. The specific configuration of each part of the stirring device according to the present invention can be changed in various ways.

A1, A2, A3: Stirring blades B1, B12, B2, B3: Stirrer 1: Base 2, 2A, 2B: Blades 3: Pump blades 4: Rotating shaft 5: Motor 7: Stirring vessel 8: Material 9 to be stirred : Cleaning solution 10 : Outer peripheral edge 11 : Inclined surface 12 : Lid 13 : Upper surface 14 : Lower surface 15 : Circulation pipeline 19 : Mounting hole 21a : Inner end 21b : Root 22a : Outer end 22b : Tip 23a : Root End 23 b : First boundary 24 a : Tip 24 b : Second boundary 25 a : Front surface 26 a : Rear surface 27 a : Front curved portion 28 a : Rear curved portion 31 : Main plate 32 : Blade plate 71 : Stirring tank 72 : Lid 73 : pump tank 74 : connection pipe 75 : return pipe 76 : baffle 751 : side injection port 752 : top injection port 753 : sprinkling portion 754 : valve portions 211 and 221 : inner surfaces 212 and 222 : outer surface 711 : bottom portion 712 : Side wall portions P1, P2 : Path F : Forward rotation direction R : Reverse rotation direction r : Radial direction θ : Circumferential direction z : Axial direction α1 : First angle α2 : Second angle α3 : Third angle β1 : First minor angle β2: second sub-angle γ1, γ2: angle

Claims (4)

a stirring vessel having a bottom and side walls and containing an object to be stirred;
A stirring device comprising a stirring blade that rotates around an axis in the stirring tank,
The stirring blade rotates in both forward and reverse directions,
A plurality of baffles arranged along the bottom in the stirring tank and each having a shape positioned in the forward rotation direction toward the radially outward direction from the rotation center of the stirring blade,
The plurality of baffles are arranged radially extending around the stirring blade ,
The stirring blade is
generating a flow of the object to be stirred that advances outward in the radial direction from the stirring blade, regardless of whether the rotating direction is the forward rotation direction or the reverse rotation direction, or
When rotating in the normal direction, the flow of the object to be stirred is caused to progress diagonally downward in the axial direction from the stirring blade, and when rotating in the reverse direction, the stirring progresses diagonally upward in the axial direction from the stirring blade. causing a stream of objects,
The height of the plurality of baffles is the height overlapping the stirring blades when viewed from the radial direction.
A stirring device characterized by: a stirring vessel having a bottom and side walls and containing an object to be stirred;
A stirring device comprising a stirring blade that rotates around an axis in the stirring tank,
The stirring blade rotates in both forward and reverse directions,
A plurality of baffles arranged along the bottom in the stirring tank and each having a shape positioned in the forward rotation direction toward the radially outward direction from the rotation center of the stirring blade,
The plurality of baffles are arranged radially extending around the stirring blade ,
The stirring blade is
When rotating in the normal direction, the flow of the object to be stirred is caused to progress diagonally upward in the axial direction from the stirring blade, and when rotating in the reverse direction, the stirring progresses diagonally downward in the axial direction from the stirring blade. causing a stream of objects,
The upper ends of the plurality of baffles in the axial direction are located below the upper ends of the stirring blades in the axial direction, and are located above the lower ends of the stirring blades in the axial direction.
A stirring device characterized by: a pump tank positioned below the stirring tank;
a pump blade accommodated in the pump tank;
a connecting pipeline that connects the bottom and the pump tank;
3. The stirrer according to claim 1 , further comprising a rotating shaft inserted through said pump tank and said connecting conduit and connected to said stirring blade and said pump blade. connected to the pump tank,
4. The stirring apparatus according to claim 3 , further comprising a reflux line for returning the object to be stirred flowing out from the bottom of the stirring tank to the stirring tank via the outside of the stirring tank.

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