JPS6346103Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a low-speed stirring tank installed in the circulation processing path for liquid materials. It is an object of the present invention to provide a low-speed stirring tank in which a stirring blade of a specific structure that rotates at a low speed is installed in the tank so that the liquid flows out from the center of the tank bottom one after another without stagnation.

In the chemical industry, food industry, pharmaceutical industry, etc., when performing various processes on liquid materials such as mixing, dispersion, and chemical reactions, large amounts of liquid materials are continuously processed through processing equipment with a relatively small processing capacity. There is a circulation treatment device in which the flow path is a closed circuit so that the supply flow is repeatedly passed through and the treatment is repeated multiple times.In this case, the liquid to be treated is temporarily held in the closed circuit and the flow is A large-capacity storage tank is provided to allow for a large amount of water to pass through.

The above-mentioned storage tank for circulation treatment requires that a large amount of liquid material to be treated be fed into the tank and flow uniformly from the inlet to the outlet without becoming locally stagnant. For this purpose, high-speed rotating stirring blades are installed in the tank, but it is difficult to prevent liquids from adhering to the tank's inner wall, drifting in the retained liquid, and stagnation at the corners of the tank. It is not enough, and as a result, until the circulation process becomes uniform,
There were problems in that excessive processing time and large amounts of processing power were required.

The present invention solves the above-mentioned problems, and uses wall blades and bottom blades to scrape off the stagnant portion of liquid adhesion that occurs on the inner surface of the tank in a liquid storage tank for circulation processing. By providing a low-speed stirring blade with a horizontal blade that divides and disperses, we succeeded in making the liquid flow in the tank uniform.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory side view showing a cross section of the main parts of a device in which a low-speed stirring tank of the present invention is installed in a circulation treatment path. An inlet 5 is provided in the upper peripheral wall of the tank body consisting of 4, and an outlet 6 is provided in the center of the bottom. 7 is lid 4
It is a rotating shaft that protrudes from the upper center of the tank to the upper part of the tank, and is rotated by an appropriate power source. Reference numeral 8 denotes a stirring blade, which is constructed by integrating a wall blade 9, a bottom blade 10, and a horizontal blade 11, and is fixed to the end of the rotating shaft 7 by an upper support member 12.

The wall blade 9 is close to the inner surface of the tank circumferential wall 2 and extends in the vertical direction, the bottom blade 10 is close to the inner surface of the bottom 3 and extends substantially in the direction of the rotation radius, and the horizontal blade 11 is arranged to extend to the depth of the liquid to be treated stored in the tank 1. one or more sheets are provided depending on the
Extends approximately in the direction of the rotation radius. As shown in FIG. 2, which is a cross-sectional view of the low-speed stirring tank taken along line A-A in FIG. (usually 20
~40°), and the length is preferably restricted to be shorter than the rotation radius so that the end edge is at an appropriate distance from the rotation center.

It is desirable that the gaps between the wall blade 9, bottom blade 10 and the inner surface of the tank be as small as possible; If this occurs between the inner surface of the tank and the inner surface of the tank, it will cause the liquid adhering to the inner surface of the tank to peel off and flow. It is possible to prevent adhesion to the surface.

The rotation of the stirring blades does not mix the liquid, but rather divides and disperses the drifting flow and scrapes off the liquid adhering to the inner surface of the tank, so it does not need to be at high speed and depends on the viscosity characteristics of the liquid and the speed of the tank. Although it varies depending on the dimensional conditions, normally a low speed rotation of about 0.5 to 3 rpm is sufficient to achieve the purpose.

As shown in FIG.
The discharge side of the continuous flow treatment device T is connected to the outflow port 6 via the pump P to form a circulation treatment path, and a large amount of liquid to be treated enters the low-speed stirring tank 1 at the inflow port. The liquid is stored so that the liquid level is 5 or less, and the pump P and rotating shaft 7 are rotated, and the continuous flow type processing device is operated to perform the required circulation treatment of the liquid.

When the liquid supplied from the inlet 5 is not stirred by the stirring blade member, a short-circuited drift toward the outlet as shown by the dashed line occurs, and the flow of the liquid in the part away from the drift zone is caused. In particular, the liquid material in contact with the inner surface of the peripheral wall 2 and the inner surface of the bottom 3 remains almost without flowing, and even if circulation treatment is performed for a long time, the liquid to be treated within the system is hardly uniformly treated. Although this is almost impossible, the rotation of the wall blade 9 and the bottom blade 10 in the present invention forcibly removes the liquid that adheres to the inner surface of the tank and agitates it, and the rotation of the horizontal blade 11 also agitates it. The short-circuit drift is divided and dispersed by the liquid flow, and an approximately uniform descending liquid flow is generated as a whole, while the flow reaches the outlet 6.
The water is sucked into the pump P and supplied to the continuous flow processing device.

When the lower end of the rotating shaft 7 and the support member 12 are positioned below the surface of the liquid to be treated in the tank, the relative speed of the portion that comes into contact with the liquid as the rotating shaft 7 rotates at a low speed is extremely small. This results in partial stagnation due to adhesion of liquid matter, which is undesirable from the viewpoint of uniform flow.

Furthermore, if the horizontal blade 11 and the bottom blade 10 are inclined with respect to the rotational radial direction as described above, the rotation of these blades will produce a stirring action and a flow in the tank diameter direction, which will help in forming a uniform liquid flow. preferable.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an explanatory side view showing a main part of the apparatus in which the low-speed stirring layer of the present invention is provided in the circulation treatment path, and FIG. FIG. 1 is a cross-sectional view of the low-speed stirring tank taken along line A-A in FIG. 1...Low speed stirring tank, 2...Surrounding wall, 3...Bottom, 4
... Lid, 5 ... Inlet, 6 ... Outlet, 7 ... Rotating shaft, 8 ... Stirring blade, 9 ... Wall blade, 10
...Bottom blade, 11...Horizontal blade, 12...
...Support member, T...Continuous flow treatment device, P...
pump.

Claims (1)

[Scope of utility model registration request] A vertical cylindrical tank with an inlet at the top and an outlet at the center of the bottom has a rotating shaft protruding from the center of the top to the top of the tank, and a stirring blade consisting of a wall blade, a bottom blade, and a horizontal blade is attached to the rotating shaft. is fixedly installed, and the wall blade and bottom blade are 5.
the inner edge of the bottom blade and the horizontal blade are inclined so that the phases of the inner edges of the bottom blade and the horizontal blade lag in the rotation direction with respect to the rotation radius connecting the rotation axis and the wall blade, and the rotation axis is A low-speed stirring tank for circulation processing that is characterized by not being located below the liquid level.