JPH0760093A - Stirring device - Google Patents

Abstract

PURPOSE:To obtain a stirring device capable of uniformly and easily stirring a slurry and a liquid by reduced enery consumption by providing the device with a stirring means having blade plates forming discharge streams to the upper layer part of the liquid in a stirring tank wherein a slurry is present in a mixed state in a horizontal direction. CONSTITUTION:A stirring tank 1 is composed of a bottomed cylindrical container 1a and a liquid 2 and a slurry 3 are present in the container 1a in a mixed state and the slurry 3 high in specific gravity is settled to the lower part of the container 1a. A stirring means 4 consists of blade plates 4b radially fixed to the lower end of a rotary shaft 4a and is rotated by a motor. When the rotary shaft 4a is rotated in the direction shown by an arrow A, the upper liquid 2 in the container 1a is pushed out outwardly and also pushed out in an obliquely downward direction to be struck against the surface of the settled slurry to rise in a whirled state. When the specific gravity of the slurry 3 is high, the buffles 5 formed to the bottom part of the container 1a are displaced in the same direction as the rotary direction of the blade plates 4b and have a gap 5a and, therefore, the mixture of the slurry 3 and the liquid 2 coming into contact with the buffles 5 rises as a whirled stream.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agitator suitable for agitating a liquid in which a liquid and a slurry are mixed, particularly a liquid in which a slurry having a large specific gravity is mixed.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, it is known that a stirring shaft c having a slanting stirring blade b is provided in a lower portion of a container a and a baffle d is provided on a side wall of the container a. ing.

[0003]

However, in the above-mentioned conventional one, a large amount of rotational energy is required at the time of starting, and when the specific gravity of the mixed slurry is large or the amount of the slurry is large, the vanes are buried in the slurry. However, there is a problem in that the starting cannot be performed or the slurry having only the stirring blade part rotates together with the stirring blade plate and the whole is not uniformly stirred.

An object of the present invention is to solve the above problems and to provide a stirring device which can stir uniformly and easily even when a slurry having a small energy consumption and a large specific gravity is mixed.

[0005]

In order to achieve the above-mentioned object, the present invention is a blade for forming a discharge flow in the horizontal direction in the upper layer portion of the liquid in the stirring tank in which the liquid and the slurry are mixed in the container. It is characterized in that a stirring means having a plate is provided.

[0006]

The upper layer portion of the liquid is pushed outward by the rotation of the vane, flows down in the stirring tank, hits the precipitated slurry layer, and turns up.

By this so-called tornado flow, the upper slurry is agitated, and at the same time, the agitated flow moves downward to raise the bottom slurry and agitate the whole uniformly. Further, since the liquid flow that is in contact with the bottom baffle swirls in a spiral shape and becomes an upward flow, stirring is performed more efficiently.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a stirring tank. The stirring tank 1 is composed of a bottomed cylindrical container 1a, in which a liquid 2 and a slurry 3 are mixed, and a slurry 3 having a large specific gravity is directed downward. It has settled.

Reference numeral 4 denotes a stirring means, which comprises a vane plate 4b radially fixed radially to the lower end of a rotary shaft 4a and is rotated by a motor (not shown).

Reference numeral 5 denotes a baffle, which is composed of a linear strip plate and is radially fixed to the bottom of the container 1a, and the center of the bottom corresponding to the intersection of these baffles has a gap 5a therebetween. Have.

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

When the rotary shaft 4a rotates in the direction of the arrow A, the upper liquid 2 in the container 1a is pushed outward by the vane 4b and also diagonally downward and hits the surface layer of the slurry 3 which has settled, and is wound with a tornado. And rises.

Therefore, the precipitated slurry 3 is sequentially floated upward and agitated.

On the other hand, when the specific gravity of the slurry 3 is large, the baffle 5 provided at the bottom is displaced in the same direction as the rotating direction of the vanes 4b and has a gap 5a, so that the slurry contacting the baffle 5 is The mixture of liquid 3 and liquid 2 rises in a swirling flow in each section as shown by the arrow.

Thus, uniform agitation can be performed without requiring a large amount of power to agitate the slurry 3 and the liquid 2 having a relatively large specific gravity.

Further, according to the comparative concentration graph (FIG. 3) in the stirring tank 1 of this embodiment B and the conventional example C, this embodiment shows that the stirring tank 1
It was found that stirring was carried out at a depth of 300 mm, 400 mm, and 500 mm at a uniform concentration.

FIG. 4 shows a second embodiment. In the second embodiment, the baffle 5 is formed as a curved strip plate and is radially fixed to the bottom of the container 1a. Compared with the baffle 5 of the embodiment, the generation of vortices is further increased, and there is an effect that stirring is performed more efficiently.

FIG. 5 shows a third embodiment. In the third embodiment, the stirring means 4 has a disk 4c fixed to the lower end of the rotating shaft 4a and a blade radially fixed to the lower surface of the disk 4c. Board 4b
And the liquid level A that was horizontal in a stationary state as shown in FIG.
Is generated by the rotation of the rotating shaft 4a to form a parabolic liquid surface B which is convex downward, and the vicinity of the root of the upper part of the blade 4b is exposed to the atmosphere, so that air is drawn below the liquid surface in the vicinity. There is a risk that air bubbles will be sucked into the liquid and the stirring effect will be reduced, and the disc 4c will prevent the bubbles from being mixed and will further improve the stirring efficiency.

Further, FIG. 7 shows a fourth embodiment. In the fourth embodiment, a cylinder 4d is erected upward on the peripheral edge of the disc 4c to prevent air bubbles from entering the liquid. The effect of this is great, and the stirring efficiency is dramatically increased.

[0021]

As described above, according to the present invention, in the agitation tank in which the liquid and the slurry are mixed in the container, the vane plate which forms the discharge flow in the horizontal direction is provided above the liquid in the agitation tank. Since a stirring means is provided, energy consumption is low,
Even if a slurry having a large specific gravity is mixed, it is possible to uniformly and easily stir.

[0022]

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

FIG. 2 is a plan view taken along the line II-II of FIG.

FIG. 3 is a graph showing the densities of an example of the present invention and a conventional example.

FIG. 4 is a plan view of the baffle portion of the second embodiment of the present invention.

FIG. 5 is a plan view of a portion of a stirring means according to a third embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a state that changes due to agitation of the liquid surface of the liquid in the container.

FIG. 7 is a sectional front view of a portion of a stirring means of a fourth embodiment of the present invention.

FIG. 8 is a vertical sectional view of a conventional example.

[Explanation of symbols]

 1 Stirring tank 1a Container 2 Liquid 3 Slurry 4 Stirring means 4a Rotating shaft 4b Blade 4c Disc 4d Cylinder 5 Baffle

Claims (5)

[Claims] 1. A stirring tank in which a liquid and a slurry are mixed in a container, wherein stirring means having a vane plate for forming a discharge flow in a horizontal direction is provided in an upper layer portion of the liquid in the stirring tank. Stirrer. 2. The stirrer according to claim 1, wherein a plurality of baffles which are separated from each other in a central portion are radially provided on a bottom portion of the stirring tank. 3. The stirrer according to claim 2, wherein the baffle is formed by a linear or curved strip plate. 4. The stirrer according to claim 1, wherein the stirring means comprises a disc fixed to the lower end of the rotating shaft and a blade plate protruding from the lower surface of the disc. apparatus. 5. The stirring device according to claim 4, wherein a cylinder is provided upright on a peripheral portion of the disc.