JPS62125835A - Stirring apparatus - Google Patents

Abstract

PURPOSE:To increase circulation function and to uniformize shearing velocity distribution by providing a screw band type stirring blade to the inside of a cylindrical vessel adjacent to the wall surface and also providing a screw-shaped fixed guide plate concentrically with the stirring blade in the space of the inner circumferential side. CONSTITUTION:The screw band blades 10 are provided between the screw- shaped guide plates 8 and the inner wall of a main body vessel 1 and also joined to the supporting rods 7. When rotating a rotary shaft 5 in the direction shown in an arrow, liquid held in the clearance between the guide plates 8 and the vessel 1 is pushed up to a top part by the blades 10 and furthermore flowed down toward a bottom part from the top part in the insides of the guide plates 8. In this environment, while liquid is firstly received with shear by the blades 10, local mixing is performed and then it is received with shear even in the insides of the guide plates 8 and advanced while being locally mixed and the mutual positions of the liquid are changed.

Description

[Detailed Description of the Invention] A [Object of the Invention] ゛(+! The great invention in the field of industrial application is the case where liquid substances are stirred and mixed to obtain a uniform product, and when polymer compounds are mixed under stirring conditions. This relates to a stirring device used in the reaction for producing .

(2) Conventional technology A large number of stirring devices have been used in the past, and for low viscosity liquids, the Pro R, turbine, and badruka are common, and for high viscosity liquids, helical ribbon blades, screw blades,
Anchor-shaped wings are common.

In particular, high viscosity liquids, which are often handled in polymer manufacturing processes, require much longer mixing times than low viscosity liquids, so product quality is affected by the selection of stirring equipment, and care must be taken. However, in the case of high viscosity liquids, the stirring power is large, so it is important to select an efficient mixing and stirring device from the point of view of power saving.

From the standpoint of mixing efficiency, the desired functions of a stirring device are: (1) the ability to flow throughout the tank (circulation function); the function to evenly distribute the shear rate throughout the tank (uniform shear rate distribution); ) It is a function that promotes macroscopic blood replacement (fluid replacement function).

Therefore, when comparing the three functions mentioned above with a typical conventional stirring device for high viscosity, the spiral band blade satisfies the function (1) above, but the function (ii) is small.
The function of i) is moderate, and in the case of a screw blade with a traft tube, it is almost the same as that of a spiral band blade, and furthermore, in the case of an anchor type blade, none of the above (1) to (I I was not satisfied with the functionality of the product.

As described above, until now, there have been almost no devices that can efficiently mix high viscosity liquids.

(3) Problems to be Solved by the Invention The problem to be solved by the invention is to propose a novel stirring device that satisfies the above three functions.

[Structure of the Invention] m Means for Solving the Problems The present invention was proposed to provide a stirring device that satisfies the above three functions. A stirring device characterized in that a stirring blade is provided in a cylindrical container close to a wall surface, and a spiral fixed guide plate is provided in the container concentrically with the stirring blade and in a space on the inner peripheral side thereof. The configuration of the device is a means of solving the problem.

(2) Function The present invention has the above-mentioned configuration as its gist, and (7) Since the spiral guide plate is provided inside the spiral band blade, the efficiency is approximately 1.5 times that of the case of only the spiral band blade. The circulatory function increases and the circulatory function is fully satisfied.

(a) Since shear occurs between the helical band blade, the helical guide plate, and between them, the function of making the shear velocity distribution uniform is reinforced.

(1) Since the fluid passing through the helical guide plate switches places along the spiral shape, the liquid replacement function is strengthened.

(3) Examples Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in the figure, the container body 1 and the lid 2 each have a liquid supply port 3.
．． A discharge port 4 is provided, and a rotating shaft 5 is inserted from the upper part of the bar. A horizontally arranged arm 6 is connected to the rotating shaft 5, and support rods 7 are attached downward from both ends of the arm 6. A spiral guide plate 8 is fixed to the container body 1 by a plurality of legs 9 so as to be concentric with the container body 1, and fluid can pass between each leg 9. A spiral band blade 10 is installed between the spiral guide plate 8 and the inner wall of the main container 1, and since this is connected to the support rod 7, the rotation shaft 5 rotated by an external drive source (not shown) The spiral band blade 10 rotates as the blade rotates.

According to this embodiment configured in this way, when the rotating shaft 5 is rotated in the direction of the arrow in the figure, the spiral band blade 10 is held in the gap between the spiral guide plate 8 and the main container 1. The liquid is pushed up to the top and further flows down within the spiral guide plate 8 from the top to the bottom.

Through this circulation, the liquid is first locally mixed while being sheared by the spiral band blades 10, and then the liquid is locally mixed while being sheared inside the spiral guide plate 8, and the liquid advances while changing the mutual position. I'll go.

As explained above, in this embodiment, it is possible to achieve very rational mixing of liquids, but the effects of this embodiment will be explained in more detail with the following specific examples.

[Comparative example]

Inner diameter 400, solder, height 700fi transparent IJ/L/
Inside the cylindrical container made of , there is a blade diameter of 396M, a blade width of 51m, and a helical pitch of 400ffllll! An experimental device equipped with a spiral band blade of 600 cm in height was used.

There is a viscosity of 100 poise in the container. and Na2S
After supplying the two liquids in which 2O3 was dissolved, the stirring train was
It was rotated at 5 rpm and the number of revolutions required until the brown color of Step 2 was decolored by Na2S2O3 was measured to determine the number of revolutions N required to complete the mixing.

In the case of this device, N=35 rotations.

The device of the above comparative example has an outer diameter of 255c++ and an inner diameter of 135M.
A spiral guide plate with a spiral pitch of 4QQa and a height of 600mm was installed as shown in the figure.

The number of rotations required to complete mixing was determined under the same conditions as in the comparative example, and was found to be N=28 rotations. This result shows that the stirring effect of the apparatus of the present invention is high.

[Brief explanation of drawings]

The accompanying drawings are explanatory diagrams of essential parts of an embodiment of the present invention. 1... Container body 8... Helical fixed guide plate] 0... Spiral band type stirring blade.・− Sub-Agent Patent Attorney Teru Ito 1 h;・:'
, '5j. , - (2 others)

Claims (1)

[Claims] A spiral band type stirring blade rotated by an external drive source is provided in the cylindrical container close to the wall surface, and a fixed spiral guide plate is provided concentrically with the stirring blade and in a space on the inner circumferential side thereof. A stirring device characterized in that it is provided in the container.