JP2002273188A - Stirrer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stirrer capable of sufficiently developing both of stirring action and shearing action. SOLUTION: An object to be stirred is raised as shown by an arrow 3 by the wall side inclined paddle 26 of a first upper blade 23 and succeedingly raised as shown by an arrow 4 by the wall side inclined paddle 26 of a second upper blade 31. By this constitution, the ascending flow of the object to be stirred can be formed up to a liquid surface 33 or up to the vicinity of the liquid surface though the object to be stirred is high in viscosity. (b) The object to be stirred is allowed to fall as shown by an arrow 5 by the shaft side inclined paddle 29 of a second upper blade 31 and succeedingly allowed to fall by the shaft side inclined paddle 29 of the first upper blade 23. As a result, a descending flow can be well formed along a drive shaft 14 even with respect to a highly viscous liquid or a solid-containing liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving a stirrer.

[0002]

2. Description of the Related Art It is well known that a stirring target, for example, a viscous fluid, stored in a stirring tank is stirred by a stirrer, and the stirrer employs blades or blades of various shapes. For example, according to FIG. 1 of Japanese Patent Publication No. 1-37173, according to FIG. 1, a stirring shaft 2 is inserted into a stirring tank 1 from above, and a bottom paddle 7 is attached to the stirring shaft 2.
It is characterized in that a lattice wing 6 (an arm portion 8 and a strip 9 are arranged in a lattice) is mounted above the bottom paddle 7. Since the lattice blade 6 is employed, the stirring resistance is small, and the power required for stirring can be reduced.

[0003]

FIG. 8 of the above publication shows the shape of the lattice wing 8, which may be formed by enlarging the bottom paddle 7 and forming a plurality of rectangular holes. I can say. By rotating the stirring shaft 2, the lattice blade 8 is also a radial blade like the bottom paddle 7, that is, a radial blade that generates a radial flow toward the wall of the stirring tank 1 around the stirring shaft 2 as shown in FIG. 9. Function as

[0004] The stirring action is evaluated by the sum of the circulation action for forcibly circulating the stirring target and the shearing action for finely chopping the stirring target. A shearing action is indispensable for crushing a solvent mass or a powder mass to disperse and dissolve in a liquid.

[0005] However, although the lattice wing 8 of the above publication exhibits a circulating action, it is very poor in a shearing action such as breaking up chunks. As a result, it takes a long time to process a stirring target including a lump. Therefore, an object of the present invention is to provide a stirrer capable of sufficiently exhibiting both a stirring action and a shearing action.

[0006]

In order to achieve the above object, a first aspect of the present invention is to provide a baffle plate on a wall of a vertical cylindrical stirring tank, and insert a drive shaft into such a stirrer from above. In a stirrer that attaches a plurality of stages of stirring blades to the shaft and stirs the stirring object stored in the stirring tank with these stirring blades, of the stirring blades, the lower stage blade closest to the bottom of the stirring tank is radiated from the drive shaft in the radial direction A flat paddle is formed by arranging a plurality of flat blades having a plane parallel to the drive shaft at equal intervals. The first upper blade above such a lower blade has an arcuate blade disposed near a baffle plate. And a wall-side inclined paddle inclined to raise the object to be stirred and an arc-shaped inclined paddle arranged to dispose the arc blade near the drive shaft and inclined to lower the object to be stirred. 2nd upper wing adjacent to 1 upper wing Is the same wall near the inclined paddles and the shaft closer inclined paddles and the first upper blade, and the first upper blade to the drive axis and which was placed in different positions, and the lower blade,
The first upper blade and the second upper blade have a basic configuration.

[0007] The lower blades discharge in the radial direction and the object to be stirred becomes a rising flow along the wall. This flow is supported by a paddle near the wall of the first upper blade and a paddle near the wall of the second upper blade to maintain the upward flow. On the other hand, the downward flow generated around the drive shaft maintains the flow by assisting with the paddle near the axis of the second upper blade and the paddle near the axis of the first upper blade. Therefore, a good circulation flow can be formed even when the stirring target is a fluid containing a high-viscosity fluid or a solid.

According to a second aspect of the present invention, when the height of the stirring tank is high, the first upper blade and the second upper blade are connected to each other, such as the lower blade, the first upper blade, the second upper blade, the first upper blade, and the second upper blade. It is characterized in that two upper blades are alternately stacked.

By alternately stacking the first upper blade and the second upper blade on the lower blade, it is possible to provide a stirrer that can be used for a stirring tank of any height.

According to a third aspect of the present invention, the stirrer is characterized in that the arc blade is connected to the drive shaft by a leg, and the leg is inclined in the same manner as the arc blade.

By inclining the legs, it is possible to impart an ascending or descending force to the object to be stirred, and to exert the effect of a knife for crushing solids or the action of finely shearing a highly viscous fluid. .

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a front view of a stirrer according to the present invention.
A cylindrical stirring tank 13 closed with the stirring tanks 1 and 12;
The drive shaft 14 inserted into the drive shaft 3 from above (the stirring blades provided on the drive shaft 14 will be described later), a drive shaft supporter 15 that rotatably supports the drive shaft 14, and rotates the drive shaft 14. And an electric motor 16.

FIG. 2 is a perspective view of the stirring blade according to the present invention. The lower blade 20 includes a plurality of flat blades 21 extending radially from the drive shaft 14 and having a surface parallel to the drive shaft 14 at equal intervals. It is a flat paddle that is arranged. The first upper blade 23 above the lower blade 20 is a wall-side inclined paddle 2 in which the arc blade 24 is attached to the drive shaft 14 with long legs 25.
The second upper blade 31 adjacent to the first upper blade 23 is constituted by the first upper blade 23 and the inclined blade paddle 29 in which the arc blade 6 and the arc blade 27 are attached to the drive shaft by short leg members 28.
The same inclined paddle 26 near the wall and the inclined paddle 2 near the axis as in FIG.
9 is arranged around the drive shaft at a position different from the first upper blade, and the lower blade 20, the first upper blade 23, and the second upper blade 31 have a basic configuration. .

FIG. 3 is a longitudinal sectional view of the stirring tank according to the present invention, in which the lower blade 20 is brought closest to the bottom dome-shaped head 11, and a first upper blade 23 is arranged thereon. This shows that the second upper blade 31 is arranged on the blade 23. Reference numeral 32 denotes baffles provided at a plurality of positions in the stirring tank 13 vertically, and the presence of these baffles 32 can prevent generation of a large vortex. In the embodiment, the number of the baffle plates 32 is four, but this number is arbitrary.

The first upper blade 23 tilts its arc blade 24 at about 45 ° to the drive shaft 14. Similarly, the second upper blade 31 connects its arc blade 27 to the drive shaft 1.
4 to make an angle of about 45 °.

FIG. 4 is a sectional view taken along the line 4-4 in FIG.
傾斜 indicates that it was inclined to form ゜. The operation of this will be described later.

FIG. 5 is a sectional view taken along line 5-5 of FIG.
The upper blade 31 is a four-blade structure including a pair of inclined paddles 26, 26 disposed near the drive shaft 14, and a pair of inclined paddles 29, 29 disposed on the drive shaft 14. The inclined paddle 26 near the wall bears the name "close to the wall" because the arc blade 24 passes near the baffle plate 32.
On the other hand, the inclined paddle 29 near the axis bears the name "adjacent to the axis" because the arc blade 27 is close to the drive shaft 14.

FIG. 6 is a sectional view taken along line 6-6 of FIG.
The upper blade 23 is, like the second upper blade 31, a drive shaft 14.
A pair of inclined paddles 26 near the wall, which are arranged with the
And a pair of inclined paddles 29, 29 disposed near the drive shaft 14 to form a four-blade structure. However, as can be seen by comparing FIGS. 5 and 6, the phases differ by 90 ° around the drive shaft 14.

FIG. 7 is a sectional view taken along the line 7-7 in FIG. 3, in which the lower blade 20 has four flat blades 21... A flat paddle attached to the drive shaft 14 at (１４pitch).

The operation of the above-described stirrer will now be described. FIGS. 8A and 8B are explanatory diagrams of the operation of the stirring blade of the present invention. The operation of the paddles 26, 26 near the wall will be described with reference to FIG. First, the object to be stirred is discharged in the radial direction as indicated by the arrow by the lower blade 20 closest to the bottom of the stirring tank 13. The stirring target follows the dome of the end plate 11 and rises as indicated by an arrow due to the action of the baffle plate 32. However, if the object to be stirred is a liquid containing a high-viscosity liquid or a solid, the flow velocity of the upward flow is sharply reduced. Therefore, in the present invention, the first paddle 23 has a wall-side inclined paddle 26,
The object to be stirred is raised as shown by the arrow, and subsequently, is raised by the inclined paddle 26 near the wall of the second upper blade 31 as shown by the arrow. With this, the stirring target is liquid level 3 despite high viscosity.
An ascending flow can be formed up to 3 or near the liquid level 33.

The operation of the inclined paddles 29, 29 near the axis will be described with reference to FIG. Inclination paddle 2 near the axis of second upper blade 31
At 9, the object to be stirred is lowered as indicated by an arrow, and then lowered by the inclined paddle 29 near the axis of the first upper blade 23. Then, even if the liquid contains a high-viscosity liquid or a solid, a downward flow along the drive shaft 14 can be formed satisfactorily.

FIG. 9 is a diagram showing the operation of the leg material and the inclined paddle according to the present invention. Since the leg 25 of the second upper blade 31 is inclined by about 45 °, a lifting force is applied to the object to be stirred. It plays the role of a knife that breaks the solids 34. In the lower first upper blade 23, the arcuate blade 27 shown by the imaginary line is also 45.
Since it is inclined about ゜, it functions as a knife for crushing the solids 34. If the object to be stirred is a high-viscosity liquid, the liquid can be sheared and the liquid can be finely chopped to enhance the stirring property.

The leg members 25 and 28 have both functions of imparting an ascending or descending force to the object to be agitated, supporting the arc blades 24 and 27, and acting as a knife for shearing the object to be agitated. The arcuate blades 24 and 27 play both the function of raising or lowering the object to be stirred and the function of a knife for shearing the object to be stirred.

FIG. 10 is a diagram showing another embodiment of the leg material according to the present invention.
It is desirable to enhance the knife action.
Such a blade 35 may be attached to the arc blade.

FIG. 11 is a view showing another embodiment of FIG. 3, in which the lower blade 20, the first upper blade 23, the second upper blade 31, and the first upper blade 23 are arranged in the stirring tank 13 in this order from bottom to top. Shown is a stirred stirrer 10B.

FIG. 12 is a diagram showing still another embodiment of FIG.
Shown is a stirrer 10C in which the lower blade 20, the first upper blade 23, the second upper blade 31, the first upper blade 23, and the second upper blade 31 are arranged in the stirring tank 13 from bottom to top in this order. That is, when the height of the stirring tank 13 is high, the lower stage blade 20, the first upper blade 23, the second upper blade 31, the first upper blade 2
3. Like the second upper blade 31, the first upper blade 23 and the second
It can be seen that the upper blades 31 may be alternately stacked.

Although the lower blade has a four-blade structure in the embodiment, it may have a two-blade, three-blade, five-blade or more multi-blade structure. Similarly, the number of blades of the first and second upper blades is arbitrary.

[0028]

According to the present invention, the following effects are exhibited by the above configuration. The stirrer according to claim 1 discharges the lower blade in the radial direction and assists the stirring object with a paddle near the wall of the first upper blade and a paddle near the wall of the second upper blade, thereby maintaining the upward flow, and maintaining the second upper blade. Downflow is generated by the paddles near the blades and the paddles near the first upper blade. Therefore, even if the stirring target is a fluid containing a high-viscosity fluid or a solid, a good circulation flow can be formed, and the predetermined stirring can be completed in a short time.

According to a second aspect of the present invention, when the height of the stirring tank is high, the first upper blade and the second upper blade are connected to each other, such as the lower blade, the first upper blade, the second upper blade, the first upper blade, and the second upper blade. A stirrer capable of accommodating stirring tanks of any height by alternately stacking first upper blades and second upper blades on the lower blade, characterized by alternately stacking two upper blades. Can be provided.

According to a third aspect of the present invention, the stirrer is characterized in that the arc blade is connected to the drive shaft by a leg member, and this leg member is tilted in the same manner as the arc blade. A force or a descending force can be applied, and a function of a knife for crushing solid matter or a function of finely shearing a highly viscous fluid can be exerted. That is, the stirring can be efficiently performed by the synergistic effect of the stirring action and the shearing action.

[Brief description of the drawings]

FIG. 1 is a front view of a stirrer according to the present invention.

FIG. 2 is a perspective view of a stirring blade according to the present invention.

FIG. 3 is a longitudinal sectional view of a stirring tank according to the present invention.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 3;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 3;

FIG. 7 is a sectional view taken along line 7-7 in FIG. 3;

FIG. 8 is a diagram illustrating the operation of the stirring blade of the present invention.

FIG. 9 is an action diagram of the leg material and the inclined paddle according to the present invention.

FIG. 10 is a view showing another embodiment of the leg material according to the present invention.

FIG. 11 is a view showing another embodiment of FIG. 3;

FIG. 12 is a view showing still another embodiment of FIG. 3;

[Explanation of symbols]

10, 10B, 10C: stirrer, 13: stirring tank, 14:
Drive shaft, 20: lower blade, 21: flat blade, 23: first upper blade, 24, 27: arc blade, 25: long leg material, 26:
Inclination paddle near the wall, 28: short leg material, 29: inclination paddle near the axis, 31: second upper blade, 32: baffle plate, 34: solid matter, 35: blade.

Claims (3)

[Claims] 1. A baffle plate is provided on the wall of a vertically placed cylindrical stirring tank, a drive shaft is inserted into such a stirrer from above, and a plurality of stages of stirring blades are attached to the drive shaft, and stirring is performed by these stirring blades. In the stirrer that stirs the stirring target stored in the tank, among the stirring blades, the lower blade closest to the bottom of the stirring tank has a plurality of flat blades extending radially from the drive shaft and having a surface parallel to the drive shaft. The first upper blades above the lower blades are arranged at equal intervals, and the first upper blades are arranged near the baffle plate and the inclined blades are inclined to raise the stirring target. A paddle and an arc blade are arranged in the vicinity of the drive shaft, and the paddle and the arc blade are inclined so as to lower the object to be stirred.
The same wall-side inclined paddle and shaft-side inclined paddle as the upper blade are arranged at positions different from the first upper blade around the drive shaft, and the lower blade, the first upper blade, and the second upper blade are of the basic configuration. A stirrer characterized in that: 2. When the height of the stirring tank is high, the first upper blade and the second upper blade, such as the lower blade, the first upper blade, the second upper blade, the first upper blade, and the second upper blade, are connected. The stirrer according to claim 1, wherein the stirrer is alternately stacked. 3. The stirrer according to claim 1, wherein the arc blade is connected to a drive shaft by a leg member, and the leg member is inclined in the same manner as the arc blade.