JPH11226374A - Highly viscous fluid stirring blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly viscous fluid stirring blade which does not generate a defectively mixed part or a large spindle shaped air bubble on account of two-layer separation, when deaerating and stirring a highly viscous fluid. SOLUTION: Plural flat platelike inclined blades 2, 3 are arranged and fixed, spaced from each other and in plural stages, and further, in such a manner that the outer edges of the inclined blades 2, 3 are set in close proximity to the inner wall face of a stirring tank 5, on pillars 1a aligned side by side and spaced between at least, two pieces of them. In addition, each of the inclined blades 2 on the top stage of the plural stages of the inclined blades 2, 3, is extended along the inner wall face. Thus the upper end part of each of the inclined blades 2 on the top stage structurally protrudes upward from a liquid level 6 to be stirred.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirring blade suitable for stirring high-viscosity liquids in the chemical industry, the pharmaceutical industry, the food industry and the like.

[0002]

2. Description of the Related Art As a conventional stirring blade, as shown in FIG. 2, a plurality of plate-like inclined blades b are spaced from each other on a column a of a rotating shaft composed of columns a arranged in parallel with at least two intervals. The outer edges of these inclined blades b are arranged in a plurality of stages in close proximity to the inner wall surface of the stirring tank c and fixed, and the upper ends of the respective struts a are connected to the drive shaft d. A stirring blade for medium / high viscosity in which a bottom surface e is provided at the lower end of each column a is known.

[0003]

However, as the viscosity of the fluid to be stirred increases, the mixing and defoaming in the tank become more difficult and the foaming at the poor flow portion increases as the viscosity of the fluid to be stirred increases. A layer is generated, resulting in two-layer separation of a poorly mixed part of the foam layer and the mixed layer, and a bubble pool formed on the back of the blade becomes a large lantern-shaped bubble reaching the liquid level and bursting. Cause a phenomenon. Further, this phenomenon causes the fluid to adhere to the unwetted portion.

[0004] The generation of such two-layer separation and the generation of lantern-shaped balloons are not preferable in terms of manufacturing by stirring.

[0005] It is an object of the present invention to solve these problems and to provide a stirring blade having good degassing performance in a high-viscosity fluid.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a plurality of flat inclined blades attached to each support of a rotary shaft composed of at least two support columns arranged in parallel at a distance. The outer edges of these inclined blades are arranged and fixed in a plurality of stages with an interval close to the inner wall surface of the stirring tank. It is characterized in that the upper end of each of the uppermost inclined blades is formed so as to extend along the wall surface and protrude above the liquid surface to be stirred.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a highly viscous fluid stirring blade of the present invention will be described with reference to FIG.

[0008] The stirring blade 1 comprises two parallel columns 1a, 1
a and a bracket 1b connecting the upper ends of the columns 1a, 1a to be connected to a single drive shaft 1c. The inclined blades 2 and 3 are multi-staged outside the columns 1a, 1a. And a floor blade 4 at the lower end of the rotating shaft.

The inclined blade 2 disposed at the uppermost stage of the column 1a comprises a flat portion 2a and a spiral portion 2b. The inclined blade 2 has an upper end protruding above the liquid surface 6, and It is formed in a spiral upward in the opposite direction to the rotation direction A. The inclined blades 3 are plate-shaped blades arranged in multiple stages below the inclined blades 2, and the plate-shaped portions 2a of the inclined blades 2 are provided.
And the outer edges of the inclined blades 2 and 3 are disposed close to the inner wall surface of the stirring tank 5.

The interval between the inclined blades 3 and 3 is set so as to slightly overlap each other when viewed horizontally.
The interval between them is also equal to these.

The bottom blade 4 has a structure in which a flat plate is bent, and the lowermost inclined blades 3, 3 of the two columns 1a, 1a are formed.
The bottom blades 4 are fixed at both ends, and have rear vertical portions 4a, 4a at locations close to the inclined blades 3, 3, and the lower end of the bottom blades 4 is close to the bottom of the stirring tank 5. It is formed as follows.

Next, the operation of the present embodiment will be described.

When the stirring blade 1 is rotated in the direction of the arrow A, the liquid in the stirring tank 5 produces an upward flow pattern of one loop by the action of the bottom blade 4, the inclined blade 3 and the flat plate portion 2a of the inclined blade 2. .

On the basis of this flow pattern, the bubbles generated in the stirring tank 5 are efficiently sent upward, and furthermore, the liquid level is prevented from growing into lantern-shaped bubbles by the extended spiral portion 2b of the inclined blade 2. It is released smoothly out of 6.

As described above, separation of two layers and generation of lantern-shaped bubbles are prevented, and both effective degassing and improvement of mixing performance are achieved.

In the present embodiment, the inclination of the inclined blades 2 and 3 is formed in a spiral upward in the direction opposite to the rotation direction A of the stirring blade 1, but this is upward in the direction of rotation A. May be formed in a spiral shape.

[0017]

As described above, according to the present invention, in the high-viscosity fluid stirring blade, separation of two layers and generation of lantern-shaped bubbles can be prevented, and the mixing time can be shortened.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a high-viscosity fluid stirring blade of the present invention.

FIG. 2 is a perspective view of an example of a conventional stirring blade for medium / high viscosity.

[Explanation of Signs] 1 Stirring blade 1a Column 1c Drive shaft 2, 3 Inclined blade 2a Flat plate portion 2b Spiral portion 5 Stirring tank 6 Liquid level

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Mikio Asai 2-1403-1-201 Nisshin, Omiya City, Saitama Prefecture

Claims (3)

[Claims] 1. A plurality of plate-like inclined blades are provided in a plurality of steps at intervals with respect to each support of a rotating shaft composed of at least two support columns arranged in parallel at an interval, and outer edges of the inclined blades. Are arranged in close proximity to the inner wall surface of the stirring tank and fixed,
Further, the uppermost one of the plurality of inclined blades is extended along the inner wall surface so that the upper end of each of the uppermost inclined blades protrudes above the liquid surface to be stirred. A highly viscous fluid stirring blade characterized by being formed. 2. The highly viscous fluid according to claim 1, wherein an extension of each of the uppermost inclined blades is formed in a spiral upward in a direction opposite to a rotation direction of the stirring blade. Stirring blades. 3. The high-viscosity fluid stirring blade according to claim 1, wherein the rotating shaft is formed to have a structure in which an upper end of the support is connected to be connected to one drive shaft.