JP5134468B2 - Stirrer - Google Patents

Description

  The present invention relates to an agitation device, and more particularly to an agitation device capable of efficiently performing up-and-down circulation mixing of a solution without dividing a circulating flow in the vertical direction of an agitation tank.

Conventionally, many stirring devices have been proposed that stir a solution using various stirring blades in accordance with the viscosity of the solution put into the stirring tank.
In this type of agitation device, small blades such as paddle blades are often used in multiple stages. In this type of agitation device, as described in Japanese Patent No. 3709414, the blade rotation speed is increased and the blades are increased. By increasing the flow rate of the solution discharged radially from the tank, the solution collides with the tank wall, generates a circulating flow that returns upward and downward, and returns to the blades, thereby stirring and mixing the solution in the stirring tank ing.
Japanese Patent No. 3709414 (second page, FIG. 14)

However, when the small blade used in the agitator is a paddle blade, the solution discharged from the upper part of the paddle blade and the solution discharged from the lower part collide with each other, and as a result, the upper and lower partitions Therefore, it becomes difficult to generate a large circulation flow over the entire stirring tank, which causes a problem in stirring and mixing the solution.
In addition to the battle blades, there are turbine blades and ribbon blades as small blades, all of which are due to their complicated shape and structure, and the discharge force is insufficient or cleaning is difficult. There's a problem.

  The present invention has been made in order to solve the above-mentioned conventional problems, and uses a paddle blade having a simple shape and circulates the circulating flow without being divided in the vertical direction of the stirring tank to efficiently circulate the solution. An object of the present invention is to provide a stirrer capable of performing up-and-down circulation mixing.

In order to achieve the above object, a stirrer according to claim 1 includes a stirring tank into which a solution is charged, a rotating shaft disposed in a central portion of the stirring tank, and a stirring blade attached to the rotating shaft. In the stirring device provided, at least the stirring blade is tapered so as to become narrower from the outer end toward the rotating shaft, and rotates at an inclination angle that raises the solution based on the rotation of the rotating shaft. A first flat plate blade member attached to the shaft, and a taper formed so as to become narrower from the outer end toward the rotary shaft at a position above the first flat plate blade member, and rotation of the rotary shaft And a second flat plate blade member attached to the rotary shaft at an inclination angle that raises the solution based on the first flat plate blade member, and a flat bottom blade provided below the rotary shaft. And the bottom wing member The upper pair of ailerons are provided at equal intervals of a position from the rotation axis, the second flat plate blade member, the flow of the solution toward the center of the stirring layers along the axis of rotation from the tank wall of the agitation tank The first flat plate blade member transmits the flow of the solution formed by the second flat plate blade member to the lower part of the stirring tank, and the bottom blade member is transmitted by the first flat plate blade member. The flow of the solution is raised along the tank wall of the stirring tank .

In the stirring device according to claim 1, the stirring blade attached to the rotating shaft is formed in a tapered shape so as to become narrower from the outer end toward the rotating shaft, and the rotation direction of the rotating shaft. The first flat plate blade member attached to the rotary shaft at an inclination angle that raises the solution with respect to the first flat plate blade member, and at a position above the first flat plate blade member, so as to become narrower from the outer end toward the rotary shaft. A second flat plate blade member formed in a taper shape and attached to the rotation shaft at an inclination angle that raises the solution with respect to the rotation direction of the rotation shaft, and formed shorter than the blade diameter of the first flat plate blade member. Therefore, first, a flow of the solution from the tank wall of the stirring tank to the center of the stirring tank is formed along the rotation axis through the second flat plate blade member, and then the flow of the solution is the first flat plate blade member. The lower part of the stirring tank along the rotation axis through In it transmitted without stagnation. Thereby, the circulating flow of the solution can be circulated without being divided in the vertical direction of the agitation tank, and the vertical circulation mixing of the solution can be performed efficiently.
In addition, a flat bottom blade member provided at the lower portion of the rotating shaft is provided, and a pair of auxiliary blades are provided at equal intervals from the rotating shaft on the upper portion of the bottom blade member. The flow of the solution that has been circulated up to the top is raised upward along the tank wall of the stirring tank. As a result, the first flat plate blade member, the second flat plate blade member, and the bottom blade member can efficiently circulate the solution in the stirring tank and mix them efficiently.

DESCRIPTION OF EMBODIMENTS Hereinafter, a stirrer according to the present invention will be described in detail with reference to the drawings based on an embodiment of the present invention.
First, based on FIG. 1, the structure of the stirring apparatus which concerns on this embodiment is demonstrated. FIG. 1 is an explanatory view schematically showing a stirring device.
In FIG. 1, the stirring device 1 includes a stirring tank 3 into which various solutions 2 are charged. As the solution 2 put into the stirring tank 3, for example, a solution in which various additives are added to the polymer solution to generate an adhesive is used.

A rotating shaft 4 is disposed at the center of the stirring tank 3. A motor (not shown) is connected to the rotating shaft 4, and the rotating shaft 4 is rotated via the motor.
A stirring blade 5 composed of three blade members is attached to the rotating shaft 4. The stirring blade 5 includes a bottom blade member 6, a first flat blade member 7, and a second flat blade member 8.

  Specifically, a bottom blade member 6 formed in a curved shape corresponding to the curved surface of the bottom of the stirring tank 3 is fixed to the lower portion of the rotating shaft 4. An auxiliary wing 9 is provided on the top of the bottom wing member 6.

A first flat plate blade member 7 is attached to a substantially central position in the vertical direction of the rotating shaft 4. As shown in FIG. 1, the first flat plate blade member 7 is formed in a tapered shape so as to become narrower toward the rotation shaft 4 from the outer end portion 7 </ b> A adjacent to the tank wall 3 </ b> A of the stirring tank 3.
As shown in FIG. 2, the first flat plate blade member 7 is attached to the rotary shaft 4 at an inclination angle that raises the solution 2 based on the rotation of the rotary shaft 4. Here, as shown in FIG. 2, the inclination angle of the first flat plate blade member 7 with respect to the rotation shaft 4 is determined to be slightly upward from the vertical state with respect to the rotation direction A of the rotation shaft 4.

Further, a second flat plate blade member 8 is attached to the rotary shaft 4 at a position above the first flat plate blade member 7. Like the first flat plate blade member 7, the second flat plate blade member 8 is formed in a tapered shape so as to become narrower from the outer end portion 8A toward the rotary shaft 4, as shown in FIG. As shown in FIG. 2, the rotary shaft 4 is attached to the rotary shaft 4 at an inclination angle that raises the solution 2 based on the rotation of the rotary shaft 4. Here, the inclination angle of the second flat plate blade member 8 with respect to the rotating shaft 4 is slightly upward from the vertical state with respect to the rotation direction A of the rotating shaft 4 as shown in FIG. It is decided to become.
Here, the blade diameter of the second flat plate blade member 8 is formed shorter than the blade diameter of the first flat plate blade member 7.

Then, when stirring the solution thrown in the stirring tank 3 using the stirring blade 5 provided in the stirring apparatus 1 comprised as mentioned above, in order to verify the stirring performance by the stirring blade 5 Based on an analysis model having the same configuration as that of the stirring device 1 of this embodiment shown in FIG. 1, numerical flow simulation analysis of the solution in the stirring tank 3 was performed.
At this time, the numerical flow simulation was performed under the following conditions.
Analysis software program: FLUENT 6.2 (manufactured by ANSYS. INC)
Number of rotations of rotating shaft: 70rpm
Solution viscosity: 1 Pa · s
Solution density: 1 g / cm ³

When the numerical flow simulation was performed under the above-described conditions, the simulation result shown in FIG. 3 was obtained.
FIG. 3 is an explanatory diagram showing velocity vectors in a cross section including the rotation axis and parallel to the rotation axis direction.

  As apparent from FIG. 3, first, the flow of the solution 2 from the tank wall 3 </ b> A of the stirring tank 3 toward the center of the stirring tank 3 is formed along the rotation axis 4 via the second flat plate blade member 8, and then It can be seen that the flow of the solution 2 is transmitted along the rotating shaft 4 to the lower part of the stirring tank 3 through the first flat plate blade member 7 without stagnation. Accordingly, the circulating flow of the solution 2 can be circulated without being divided in the vertical direction of the stirring tank 3 so that the vertical circulation mixing of the solution can be performed efficiently.

  Further, the flow of the solution 2 circulated to the lower part of the stirring tank 3 through the flat bottom blade member 6 provided at the lower part of the rotating shaft 4 flows upward along the tank wall 3A of the stirring tank 3. You can see that it is rising. Thus, the first flat plate blade member 7, the second flat plate blade member 8, and the bottom blade member 6 can efficiently circulate the solution 2 in the stirring tank 3 and mix it efficiently.

  As described above, in the stirring device 1 according to this embodiment, the stirring blade 5 attached to the rotating shaft 4 is tapered so as to become narrower from the outer end portion 7A toward the rotating shaft 4. A first flat plate blade member 7 formed and attached to the rotary shaft 4 at an inclination angle that raises the solution 2 with respect to the rotation direction of the rotary shaft 4, and an outer end at a position above the first flat plate blade member 7. The first flat plate blade is formed in a tapered shape so as to become narrower from the portion 8A toward the rotating shaft 4 and attached to the rotating shaft 4 at an inclination angle that raises the solution 2 relative to the rotating direction of the rotating shaft 4 Since the second flat plate blade member 8 formed shorter than the blade diameter of the member 7 is provided, first, stirring is performed along the rotation axis 4 from the tank wall 3A of the stirring tank 3 via the second flat plate blade member 8. A flow of solution 2 toward the center of tank 3 is formed, and then such solution 2 Stream is transmitted without stagnation to the bottom of the stirred tank 3 along the rotary shaft 4 through the first flat plate wing member 7. Thereby, the circulating flow of the solution 2 can be circulated without being divided in the vertical direction of the stirring tank 3, and the vertical circulation mixing of the solution can be performed efficiently.

Moreover, since the flat bottom blade member 6 provided at the lower part of the rotating shaft 4 is provided, the flow of the solution 2 circulated to the lower part of the stirring tank 3 is along the tank wall 3A of the stirring tank 3. It is raised to the upper side. Thus, the first flat plate blade member 7, the second flat plate blade member 8, and the bottom blade member 6 can efficiently circulate the solution 2 in the stirring tank 3 and mix it efficiently.
In addition, this invention is not limited to the said embodiment, Of course, various improvement and deformation | transformation are possible within the range of the summary of this invention.
For example, in the above-described embodiment, the two flat plate blade members of the first flat plate blade member 7 and the second flat plate blade member 8 are attached to the rotating shaft 4 as the flat plate blade member. Three or more may be attached.

It is explanatory drawing which shows a stirring apparatus typically. It is a perspective view which shows a stirring blade typically. It is explanatory drawing which shows the velocity vector in the cross section which is parallel to a rotating shaft direction and contains a rotating shaft.

1 Stirrer 2 Solution
3 Stirring tank 4 Rotating shaft 5 Stirring blade 6 Bottom blade member 7 First flat blade member 8 Second flat blade member

Claims (1)

A stirred tank into which the solution is charged;
A rotating shaft disposed in a central portion of the stirring tank;
In a stirring device comprising a stirring blade attached to the rotating shaft,
The stirring blade is at least
A first flat plate blade member formed in a tapered shape so as to become narrower from the outer end toward the rotation shaft and attached to the rotation shaft at an inclination angle that raises the solution based on the rotation of the rotation shaft;
At a position above the first flat plate blade member, a taper is formed so as to become narrower from the outer end toward the rotation axis, and the rotation axis is inclined at an inclination angle that raises the solution based on the rotation of the rotation axis. A second flat blade member attached and formed shorter than the blade diameter of the first flat blade member;
A flat bottom wing member provided at a lower portion of the rotating shaft,
On the top of the bottom blade member, a pair of auxiliary blades are provided at equal intervals from the rotating shaft ,
The first flat plate blade member and the second flat plate blade member are attached to the rotating shaft so as to overlap each other in the vertical direction,
The second flat plate blade member forms a flow of the solution from the tank wall of the stirring tank to the center of the stirring tank along the rotation axis,
The first flat plate blade member transmits the flow of the solution formed by the second flat plate blade member downward along the rotation axis to the lower part of the stirring tank ,
The bottom wing member raises the flow of the solution transmitted by the first flat plate wing member along the tank wall of the stirring tank .

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