JP2941676B2 - Vertical stirrer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical stirrer used in a polymerization reactor for batch operation, and more particularly to a vertical stirrer suitable for stirring a high-viscosity liquid.

[0002]

2. Description of the Related Art Heretofore, in a vertical stirrer as disclosed in Japanese Patent Application No. 2-21995, a cross-shaped stirring blade supporting member placed horizontally during stirring has a certain height on the upper surface of a cross portion serving as a rotation center. Horizontal surface with a surface area of approximately 1k
Pa. s to 5 kPa. When the viscosity becomes high, a phenomenon occurs in which the processing liquid stays on the surface and does not move.

[0003] As a result, the quality of the retained processing solution is different from the quality of other uniformly mixed processing solutions, and if the retained material falls during operation, the product is contaminated.
Further, if the retained processing liquid is left as it is without being discharged, it is mixed with the processed material in the next batch operation, and the quality of the product is affected.

[0004]

The above prior art has a problem that the quality of the product is not stabilized because no consideration is given to the improvement of the quality of the product.

According to the present invention, the viscosity of the processing solution is about 1 kPa. s to 5 kPa. It is an object of the present invention to provide a vertical stirrer having a stirring blade in which a processing liquid does not stay even if the viscosity becomes high.

[0006]

The stirring blade described in the above prior art has a pressure of about 1 kPa. s to 5 kPa. When the high viscosity liquid of s is stirred, it shows very excellent mixing characteristics. 5k
Pa. In the stirring of the processing solution of s, the total number of revolutions until uniform mixing is about 100th, and the processing solution is faster than conventional blades such as helical blades {approximately 300 total number of revolutions are required for uniform mixing}. Can be uniformly mixed.

[0007] Therefore, in order to achieve the above object, the basic shape of the stirring blade is not changed, and a conical structure is provided on the upper surface of the cross portion of the stirring blade support member so that the processing liquid does not stay, The bar radiated in a cross shape is inclined so that the center of the part is at the top.

[0008]

When the stirring is stopped, the cross-shaped connecting rod is in the liquid, but when stirring, the upper surface of the liquid becomes funnel-shaped and depending on the amount of liquid and the number of rotations, the connecting rod is exposed in the liquid. For this reason, if there is a horizontal surface having an area on the top surface of the cross bar of the connecting rod, the high-viscosity processing liquid stays without being shaken off, but a projection is placed on the top surface of the cross center or the center portion is The high position prevents the treatment liquid from staying.

[0009]

1 and 2 show an embodiment of the present invention.
FIG. 1 shows a vertical stirrer described in Japanese Patent Application No. 2-21995, in which a cone 7 is formed on the upper surface of a cross portion of a cross-shaped connecting rod 4 which is a support member of the stirring blades {spiral blades 5 and 6}. It is a structure provided.

In a main body 1 composed of a cylindrical body and an inverted conical body, one straight connecting rod 3 and two cross-shaped connecting rods 4 are arranged vertically at a certain interval horizontally. These connecting rods 3,
Numerals 4 are arranged at the same phase angle in the rotational direction and shifted from above. The two plate-shaped spiral blades 5 are connected to two opposing ends of a lower cross-shaped connecting rod 4 from both ends of the uppermost straight connecting rod 3 while being inclined in the direction of rotation. Further, spiral wings 5 are connected in the same manner to two opposing ends of the cross-shaped connecting rod 4 below the remaining two ends of the connecting rod 4.

The spiral wing 5 is disposed 180 degrees along the inner wall of the main body 1 while keeping a slight gap from the inner wall.

[0012] Similarly, in the inverted conical cylinder portion, the main body 1 is also provided.
Two helical blades 6 are arranged below the two ends of the lowermost cross-shaped connecting rod 4 along the inner wall while maintaining a slight gap with the inner wall while being inclined in the direction of rotation. To connect.

The treatment liquid in the main body 1 is lifted upward from the inner wall side of the main body 1 by the spiral blades 5 and 6 by the rotation of the rotating shaft 2, and is lowered from the center of the main body 1 to be uniformly mixed. At this time, since the conical body 7 is provided on the upper surface of the cross portion of the connecting rod 4, even if the connecting rod 4 is exposed, the processing liquid does not contaminate.

FIG. 2 shows the details of the structure in which the conical body 7 is provided on the upper surface of the central part of the cross-shaped connecting rod 4.

FIG. 3 shows another embodiment of the present invention.
Instead of the cross-shaped connecting rod 4 of FIGS. 1 and 2, a cross-shaped inclined connecting rod 8 having the center of the cross positioned at the top and four emitted rods being inclined is used.

[0016]

According to the present invention, it is possible to prevent the treatment liquid from staying on the surface of a structure such as a stirring blade during stirring of a high-viscosity liquid, thereby improving the quality of a product. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a vertical stirrer according to the present invention.

FIG. 2 is a detailed view of the cross-shaped connecting rod of FIG.

FIG. 3 is a front view showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Rotating shaft, 3 ... Straight connecting rod, 4 ... Cross-shaped connecting rod, 5, 6 ... Spiral wing, 7 ... Conical body, 8 ... Cross-shaped inclined connecting rod.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoji Nakamura 794, Higashitoyoi, Katsumatsu-shi, Yamaguchi Prefecture Inside the Kasado Plant, Hitachi, Ltd. (56) References JP-A-3-188935 (JP, A) Akira Tokubo 52-10739 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B01F 7/00-7/32

Claims (1)

(57) [Claims] 1. A vertical cylindrical containerWhen, A rotating shaft provided at the top of the vertical cylindrical container, Connected to the lower end of this rotating shaft With a straight connecting rod, Arranged at a distance from each other below this straight connecting rod
 Multiple cross-shaped connecting rodsWhen,  Up and downAdjacent toA slight gap between the ends of the connecting rod and the inner wall of the trunk
Spiral wings connected along the inner wall while maintainingConsisting of
In a vertical stirrer,the above Cross-shaped connecting rodIs at the top of its center
Having a cross-section.
Prevent processing liquid from staying in the center of the connecting rodThat
Characteristic vertical stirrer.