JPS61118121A - Stirrer - Google Patents

Abstract

PURPOSE:To mix the high-viscosity liquid in high mixing efficiency by providing the plural sheets of thick disks which are made eccentric in the different direction respectively for a rotary shaft of draft tube and fixed thereto so that these are made to a spiral arrangement. CONSTITUTION:When the high-viscosity liquid to be treated is flowed to the inside of a main body vessel 1 from a feed port 2 and a rotary shaft 10 is rotated, the spiral band blades 14 and the plural sheets of thick disks 15 are rotated together with the rotary shaft 10 in one body. While the liquid incorporated in a draft shaft 6 is sheared by the rotation of the plural sheets of thick disks 15, it is moved to the upper part and flowed out to the cylindrical space 12 from an aperture 7 of upper end. On the other hand, the liquid incorporated in the cylindrical space 12 is pushed down to the lower part by the rotation of the spiral band blades 14 and returned to the inside of the draft tube 6 through an aperture 8 of lower end thereof.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a stirring device used for stirring and mixing liquid substances to obtain a uniform product or for a reaction for producing a polymer compound under stirring conditions. Regarding.

[Prior art and problems to be solved by the invention] There are many types of stirring devices. For low viscosity liquids, propellers, turbines, paddles, etc. are generally used, and for high viscosity liquids, spiral belts are used. Wings (helical ribbon), screw wings, anchor-shaped wings, etc. are commonly used.

In particular, high viscosity liquids, which are often handled in the manufacturing process of polymer compounds, require a longer mixing time than low viscosity liquids, so the quality of the product will be affected by the selection of stirring equipment, so care must be taken. It is. In addition, in the case of high viscosity liquids, a large amount of stirring power is required, so it is necessary to select an efficient device from the viewpoint of power saving.

From the standpoint of mixing efficiency, the functions necessary to efficiently disperse gas in the liquid are: - A function to flow the liquid throughout the tank (circulation function) - A function to disperse the gas in the liquid throughout the tank ( (Function to equalize shear rate distribution) ■Function to promote macroscopic exchange of liquid (liquid replacement function).

By the way, when considering the above three functions of conventional stirring devices, those with spiral band blades and screw blades with draft tubes satisfy the function (■), but the function (■) is small;
The functionality is moderate. Moreover, the one between the anchor shapes does not satisfy any of the functions (■) to (■).

For this reason, it has been desired to develop a stirring device that can efficiently mix high viscosity liquids.

The purpose of the present invention is to achieve the above three functions, namely, circulation function,
The object of the present invention is to provide a stirring device that can satisfy both the function of uniformizing shear rate distribution and the function of replacing liquid.

[Means for solving problems]

In order to achieve the above object, the stirring device of the present invention includes: a cylindrical main body container having a liquid substance supply port and a discharge port, and installed with its axis oriented in the vertical direction; A cylindrical draft tube is provided concentrically with the container and has upper and lower ends as openings, a rotating shaft is rotatably provided at the axial center position of the draft tube, and the main container is supported by the rotating shaft. and a draft tube, and a plurality of thick-walled disks fixed to the rotation axis so as to be eccentric in different directions and arranged in a spiral shape. It is characterized by what it did.

(Effect of the invention) In the above configuration, the circulation function of the spiral band blade is strengthened by the plurality of thick disks provided in the draft tube, and ■
l1il- is sufficiently satisfactory.

In addition, the plurality of thick-walled discs increases the shearing rate of the liquid passing through the draft tube.
functions are enhanced.

Roughly speaking, the liquid in the draft tube flows vertically while being subjected to strong shear due to the rotation of multiple thick-walled disks, so the liquid in the draft tube is mixed efficiently, and the function of ■ It will also be enough to satisfy you now.

(Embodiment of the Invention) The figures show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of a stirring device, and FIG. 2 is a sectional view taken along line II-II in FIG. 1.'' Main body container 1 has a cylindrical shape and is installed with its axis oriented vertically.This main container 1 has a liquid substance supply port 2 at the bottom and a liquid substance discharge port 5 in the lid part 4. Inside the main body N1, a cylindrical draft tube 6 is housed concentrically with the container 1.The draft tube 6 has its upper and lower ends open (the upper end The lower end of the lower end opening 8) is fixed to the inner bottom of the main body 11 via a plurality of legs 9. Also, inside the draft tube 6, there is a rotating shaft located at its axial center position. 10S, and this rotating shaft 10 is rotatably supported at the center of the lid part 4. On the rotating shaft 1o, an arm 11 is mounted horizontally at a position slightly above the draft tube 6. The center part is fixed. At both ends of this arm 11, the upper ends of two support rods 13 located in the dark cylindrical space 12 between the main body container 1 and the draft tube 6 are fixed. Two spiral band blades 14 located within the cylindrical space 12 are supported by both support rods 13 .

On the other hand, a plurality of thick disks 15 are fixed to the rotary wheel 10 at positions within the draft tube 6. These plurality of discs 15 are all fixed at their eccentric positions to the rotating shaft 10, and their eccentric directions are sequentially shifted in the circumferential direction so that they are arranged in a spiral shape opposite to the spiral band blades 14. . Furthermore, the circumferential pitch of each of the thick disks 15 can be adjusted.

Next, the effect will be explained.

First, the high viscosity liquid to be treated is supplied from the supply port 2 to the main container 1.
When the rotating shaft 10 is rotated by flowing into the
The spiral band 114 and the plurality of thick disks 15 rotate together with this. Therefore, the liquid in the draft tube 6 moves upward while being sheared by the rotation of the plurality of thick disks 15, and flows out into the cylindrical space 11012 from the lower portion between the upper ends.

On the other hand, the liquid in the cylindrical space 12 is pushed downward by the rotation of the spiral band I114, and is returned into the draft tube 6 through its lower end opening 8.

In the above configuration, the liquid in the main body container 1 is strongly circulated by the spiral band blades 14 and the plurality of thick disks 15,
The circulation function (2) above is fully satisfactory.

In addition, the plurality of thick disks 15 reduce the shearing rate of the liquid passing through the draft tube 6, thereby improving the function of making the shearing rate distribution uniform as described in (2) above.

Furthermore, since the liquid in the draft tube 6 flows vertically upward while being subjected to strong shear due to the rotation of the plurality of thick disks 15, the liquid in the draft tube 6 is efficiently stirred. The liquid replacement function (2) is also fully satisfactory.

Next, the conventional spiral band airfoil l! Itching device [Experiment example 1],
The following results were obtained by comparing the stirring device and the stirring device [Experimental Example 2] prepared based on the above example.

(Experimental Example 1) The main body container is made of transparent acrylic with an inner diameter of 300 txm and a height of 550 m, and the spiral band blade has a blade diameter of 294 m5+, a blade span of 30 feet, a helical pitch of 300 feet, and a height of 450 m.The liquid is 10 mm.
Assume that Ifu having a viscosity of 0 voids is dissolved,
The helical band blade was rotated at 60 rpm+ and 1.
5 times Na 28203 (hypo) was supplied. At this time, the decolorization of I2 progressed with the passage of time, and it was completely decolorized 30 minutes after hypo supply.

[Experimental Example 2] A draft tube 6 with an outer diameter of 200 am, an inner diameter of 180 mil, and a height of 45' Oam was added to the apparatus of Experimental Example 1, and a plurality of thick disks 15 with a wall thickness of 30 M and a diameter of 140 Ill were installed in the circumferential direction. A device was created based on the above example by adding at a pitch of 60°, and the conditions such as liquid, rotation speed and hypo supply were the same as in Experimental Example 1, and the opening during decolorization was measured.
The color was completely decolored in 16 minutes.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal cross-sectional view of a stirring device, and FIG. 2 is a cross-sectional view of FIG. 1. 1... Main body container, 2... Liquid substance supply port, 5...
・Discharge port, 6... Draft tube, 7... Upper end opening, 8... Lower end opening, 10... Rotating shaft, 14...
Spiral band blade, 15...thick cylinder.

Claims (1)

[Claims] A cylindrical main body container having a supply port and a discharge port for a liquid substance and installed with its axis facing vertically, and a cylindrical main container provided within the main container concentrically with the container, with the upper and lower ends open. A cylindrical draft tube, a rotating shaft rotatably provided at the axial center position of the draft tube, and a spiral band supported by the rotating shaft and disposed within the cylindrical space between the main body container and the draft tube. A stirring device comprising: a blade; and a plurality of thick disks fixed to the rotating shaft so as to be eccentric in different directions and arranged in a spiral pattern.