JPH10174857A - Vertical agitator having linearly asymmetrical plate impellers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the fabrication cost and not to deteriorate the agitation performance by mounting a plate provided with plural small holes or notches on both sides of an agitating shaft at a specified phase angle and arranging the plural notches asymmetrically to the agitating shaft. SOLUTION: An agitating shaft 2 is provided in the center of a vertical cylindrical agitated tank 1, and two plates 3 each furnished with plural notches 5 are attached to the agitating shaft 2 at a phase angle of 180 deg. as an impeller. The lateral length of the impeller is controlled to 25 to 80% of the inner diameter of the agitated tank 1. One or more plate baffles 4 are vertically fixed to the inner wall of the tank 1. The notches are arranged asymmetrically to the agitating shaft 2. The horizontally long, trapezoidal, vertically long, circular, elliptic or triangular notch can be used. Further, the total area of the notches formed in the plate 3 is preferably controlled to 50 to 80% of the area of the plate 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method of stirring, mixing, and treating a processing solution having a viscosity of 0.1 centi-poise to 10,000 centi-poise.
The present invention relates to a mechanical stirrer suitable for operations such as reaction and dispersion.

[0002]

2. Description of the Related Art Conventionally, a stirring blade composed of a flat plate includes a turbine blade, a paddle blade, an anchor blade, and the like.
Alternatively, a flat plate was provided in line symmetry. Further, a plurality of stirring blades are attached around the stirring axis at the same phase angle. When the size of the stirring tank increases and the length thereof increases in the height direction, the stirring blades are provided in multiple stages, and the production cost increases. In addition, the mixing performance deteriorates. As shown in FIG. 6, mixing around the stirring blades is performed, and a partition zone is formed between the upper and lower parts, so that mixing between the upper and lower parts becomes impossible, so that the entire processing liquid cannot be mixed.

Japanese Patent Application Laid-Open No. 7-108153 discloses this type of stirrer.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stirrer which can reduce the production cost as the capacity of a stirring tank is increased and which does not deteriorate the stirring performance.

[0005]

Means for Solving the Problems A flat plate stirring blade is provided in which the width of the stirring blade (in the height direction of the vessel) is increased to near the liquid surface, and a plurality of small stirring blades are provided on the flat plate in order to reduce the power and not deteriorate the stirring performance. Holes and / or notches are provided.

[0006]

1 to 5 show an embodiment of the present invention. A stirring shaft 2 is provided at the center of a standing cylindrical stirring tank 1,
The two flat plates 3 provided with a plurality of notch holes 5 in the stirring shaft 2
Attach with a phase difference of 80 degrees. The external shape of the stirring blade is the stirring tank 1
The length should be 25% to 80% of the inner diameter. At least one flat baffle 4 is attached to the inner wall of the stirring tank 1 in the vertical direction.

The plurality of cutout holes 5 are arranged asymmetrically with respect to the stirring shaft 2. FIG. 1 shows a horizontally long rectangle as a cutout shape, FIG. 2 shows a trapezoidal shape, FIG. 3 shows a vertically long rectangle, and FIG.
Indicates a circular or elliptical shape, and FIG. 5 shows a triangular shape. By mounting the flat plate 3 at an angle of 30 degrees or less, it is possible to further promote the overall stirring.

Further, the total area of the plurality of small holes and / or notches provided in the flat plate 3 is 50 to 8 of the area of the flat plate 3.
By selecting 0%, the mixing speed is improved because the velocity vector behind the blade is not random.

[0009]

According to the present invention, the stirrer does not need to be provided in multiple stages as in the prior art with the increase in the size of the stirring tank. Can be reduced.

In addition, since the flow of the liquid is not a simple velocity vector but a complicated velocity distribution as shown in FIG. 7 due to the asymmetry of the stirring blade, the mixing performance does not deteriorate.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a vertical stirring tank according to the present invention.

FIG. 2 is a partial front view showing another shape of the stirring blade.

FIG. 3 is a partial front view showing another shape of the stirring blade.

FIG. 4 is a partial front view showing another shape of the stirring blade.

FIG. 5 is a partial front view showing another shape of the stirring blade.

FIG. 6 is a sectional view showing a conventional stirring tank.

FIG. 7 is a view showing a liquid flow in a cross section by the stirring blade of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stirring tank of a standing cylinder, 2 ... Stirring shaft, 3 ... Flat plate (stirring blade), 4 ... Baffle, 5 ... Notch hole, 6 ... Conventional stirrer and liquid flow, 7 ... Stirrer of the present invention Liquid flow.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasunari Sase 794, Higashi-Toyoi, Kazamatsu City, Yamaguchi Prefecture Inside the Kasado Plant of Hitachi, Ltd.

Claims (6)

[Claims] 1. A flat plate having a stirring shaft in a standing cylindrical container and provided with a plurality of small holes and / or notched holes is attached at both sides of the stirring shaft at a phase angle of 180 degrees, and A stirrer having stirring blades that are non-symmetric with respect to an axis. 2. The stirrer according to claim 1, wherein the cutout hole of said flat plate has at least one circular, elliptical, triangular, trapezoidal, or rectangular shape, and is asymmetric with respect to said stirring axis. A stirrer having wings. 3. The stirrer according to claim 1, wherein the blade has a stirring blade having a length of 25% to 80% of the inner diameter of the cylindrical vessel. 4. The stirrer according to claim 1, wherein one or more baffles are provided vertically outside the inner stirring blade of the container. 5. A stirrer according to claim 1, wherein said flat plate stirring blade is inclined within 30 degrees. 6. The stirrer according to claim 1, wherein the total area of the plurality of small holes and / or notches is 50 to 80% of the area of the flat plate. mixer.