JPH0240227A - Agitation device - Google Patents

Abstract

PURPOSE:To obtain high mixing capacity for viscous matter and to reduce the agitation power by providing such plural plane plate blades radially around the revolving shaft in the center of a vessel that extend to the near part of the inner wall surface of the vessel and have a number of small holes uniformly distributed on the surface. CONSTITUTION:When the revolving shaft 5 is driven by a driving, unit, the contents are moved upward or downward accompanied with the movement of each plane plate blade 6, 7, and at the same time, a part of the contents is passed through a number of small holes 11 provided in the plane plate blades 6, 7 and mixed turbulently in the backside of the plane plate blades 6, 7. Thus, strong and complicated flows of the material to be agitated are formed all over the inside of the vessel 1 as well as near the surface of the plane plate blades 6, 7. Consequently, the solid-like revolution or the retaining state of the material to be agitated is eliminated and the agitation effect and the reaction effect are sharply improved. Namely, the agitating and mixing function for the material to be agitated is superior and the construction of the device is simpler compared with the reaction device of one shaft. when this device is used for a polymerizing reaction, the reaction is efficiently proceeded and the quality of the polymer is stable and excellent.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention can be used for mixing high viscosity liquid or slurry substances by stirring to obtain a uniform product, or The present invention relates to a stirring device used in a polymerization reaction for polymerizing substances to obtain a high-viscosity polymeric substance.

<Prior Art> In a process for producing a polymeric substance, a reaction mixture generally has a low viscosity at the beginning of the reaction, and increases in viscosity from the middle to the end of the reaction. Highly viscous reaction mixtures are difficult to mix uniformly, and product quality is affected by the selection of a stirring device, so careful consideration is required when determining the structure.

In addition, to uniformly mix high viscosity liquids, depending on the structure of the stirring blade, an extremely large stirring force may be required, and from the viewpoint of the material of the stirring blade, stirring power, etc., it is necessary to achieve efficient mixing performance. It is necessary to select a stirring device with

Conventionally, large paddle impellers, anchor-type impellers, helical ribbon impellers, and helical screw impellers have been widely used as stirring devices for highly viscous substances.

<Problems to be Solved by the Invention> However, although large paddle blades and anchor-type blades have the advantage of being simple in structure and easy to manufacture and clean, they have poor mixing performance for high viscosity substances, and furthermore, they have poor stirring power. There was a problem with the size.

In addition, helical ribbon blades and helical screw blades have good mixing performance for high viscosity substances, and the stirring power does not increase too much. However, they have a complicated structure, making it difficult to manufacture and expensive. Therefore, there was a problem that cleaning was not easy.

In view of the above problems, the present invention (1) has a relatively simple structure, (2) exhibits high mixing performance for high viscosity substances, and (3) has a relatively simple structure.
) Another object of the present invention is to provide a new stirring device with low stirring power.

<Means for Solving the Problems> In order to achieve the above object, in the present invention, a rotating shaft is provided in the center of the container, and the containers are arranged at approximately equal intervals around the rotating shaft, and radially from the rotating shaft. The container is configured to include a plurality of flat plate wings extending outwardly to a position substantially close to the inner circumferential wall surface of the container and having a large number of small holes substantially uniformly distributed on the surface.

Further, the total area of the small holes formed in the flat blade is set to be in the range of 1/3 to 1/2 of the area of the flat blade.

In the above configuration, the contents are moved in the direction of rotation of each flat blade, and at the same time, the contents pass through a number of small holes provided on the flat blade surface, and the contents are transferred to the back side of the flat blade. The mixture is remixed in a slightly turbulent manner.

According to this, co-rotation does not occur and stagnation phenomenon can be prevented, so that stirring and mixing can be performed efficiently, and when used in a polymerization reaction, the quality of the obtained product is also stable and excellent.

In addition, it has a simple structure with a single shaft, and is excellent in labor saving.

<Example> An example of the present invention will be described below based on the drawings, but the present invention is not limited to the following example unless it exceeds the gist thereof.

FIG. 1 is a schematic sectional view showing one embodiment of the present invention.

A horizontal cylindrical container 1 has its outer peripheral wall surrounded by a jacket 2 for temperature regulation.

A rotating shaft 5 rotatably penetrates both end walls of the container 1 via shaft seals 3.4, and a pair of flat blades 6.7 are attached radially around this rotating shaft 5. This constitutes a paddle device 8. In this example, there is one pair of flat plate blades, but a plurality of flat plate blades may be arranged at approximately equal intervals around the rotation axis, and each may extend radially straight outward from the rotation axis.

The flat plate wings 6.7 have their edges close to the inner circumferential wall of the container 1, and have defective parts 9.10 at diagonally opposing parts.
It is formed. The size and location of the defect area can vary widely. Further, a large number of small holes 11 are formed almost uniformly on the surfaces of the flat blades 6 and 7, and the total area and position of the small holes 11 can be varied over a wide range, but the total area is the same as that of the flat blades 6. The area is preferably in the range of 1/3 to 1/2 of the area.

Here, when the rotating shaft 5 is rotated by a drive device (not shown), the contents (substance to be stirred) are moved upward or downward with the movement of each flat plate blade 6. , 7, and are remixed in a somewhat turbulent flow on the back side of the flat plate blades 6.7.

Therefore, a strong and complicated flow of the substance to be stirred is formed not only near the surface of the flat blade 6.7 but also over the metal body inside the container l.

Thereby, it is possible to avoid the co-circulation and stagnation phenomenon of the substance to be stirred, and the stirring effect 9 reaction effect can be significantly improved. In other words, this apparatus has a simpler structure than a conventional single-shaft reactor, and has an excellent ability to stir and mix the substances to be stirred, so when used in a polymerization reaction, The polymerization reaction can proceed efficiently, and the quality of the resulting polymer is stable and excellent.

(Effects of the Invention) As explained above, the apparatus of the present invention has the following effects, and the industrial utility value of the present invention is extremely large.

According to the device of the present invention, the structure of the device is simple and the conventional one
It is possible to prevent the content from stagnation in the vicinity of the stirring shaft and stirring blades that occurs in shaft stirring devices, and it has an excellent function of stirring and mixing the materials to be stirred, and because it requires less stirring power, it is economical. It also meets the electricity requirements.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention. ■...Container 3, 4...Shaft seal 5...Rotating shaft 6.7...Flat wing End...Paddle device 9.1
0... Defect part 11... Small hole

Claims (2)

[Claims] (1) A rotary shaft is provided at the center of the container, and they are arranged at approximately equal intervals around the rotary shaft, and are arranged radially outward from the rotary shaft to a position that is almost close to the inner circumferential wall surface of the container. A stirring device comprising a plurality of flat plate blades extending and having a large number of small holes substantially uniformly distributed over the surface. (2) The stirring device according to claim 1, wherein the total area of the small holes formed in the flat blade is in the range of 1/3 to 1/2 of the area of the flat blade.