JPS60202720A - Mixing and stirring apparatus of high viscous substance - Google Patents

Abstract

PURPOSE:To get rid of gas layer parts in the inside of main body casing and to make gas-liquid contact areas small by maintaining the tips of stirring blades which are fitted in opposition to two rotating shafts at a slight clearance between the tips and the inner wall of said main body casing. CONSTITUTION:Two rotating shafts 16 are parallel arranged to the inside of an ellipse cylindrical main body casing 15 wherein an inlet nozzle 18 is provided at one end side and an outlet nozzle 19 is provided at the other side. Plural stirring blades 17 are opposited and fitted while shifting the phase at 90 deg. wherein scraping blades 22 are fitted to the tips of blades 17 in the shaft direction of said rotating shafts 16 and at a slight clearance between the tips and the inner wall of main body casing is maintained. Also, rotating partition boards 21 wherein plural liquid through-holes are provided to the opposite position of two rotating shafts 16 are fitted mutually and adjacently with the slight clearance between said board 21 and the inner wall of main body casing. As a result, gas-liquid contact areas are small and sufficient retention time can be maintained and the mixing and stirring apparatus excellent in mixing characteristics for high viscous substance can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a mixing and stirring device for high viscosity substances, and particularly to a mixing and stirring device for high viscosity substances that does not require a gas-liquid interface.

As an example of a conventional mixing and stirring device for high viscosity substances without a gas phase, as shown in FIGS. 1 and 2, two screws 2.2 are rotated inwardly within a main body casing 3. They are arranged parallel to each other, with a row containing a high viscosity substance on one side,
On the other hand, there is an extruder equipped with a high viscosity substance outlet (not shown), but it has the disadvantage that the shear force is large (and the shear acts on the high viscosity substance, causing quality deterioration). However, the disadvantages are that the volume inside the device is small and the residence time is not sufficient.)
However, there was a problem that the cost per processing amount was high. On the other hand, as a mixing and stirring device for high viscosity substances with a gas phase section,
As shown in FIGS. 3 and 4, a two-axis circular IFI type stirring device in which a plurality of discs 5 are arranged alternately on two rotating shafts 6, 6 provided in parallel in one main body casing 4, or Figure 5,
As shown in FIG. 6, two rotating shafts 8, 8 provided in parallel inside the main casing 7 are provided with figure-8 annular stirring blades 9 having scraping blades 10 at their tips, symmetrical to each other and 1. A horizontal twin-shaft stirring device arranged with a 90 degree phase shift was used. However, the purpose of these devices is to increase the gas-liquid contact area.In particular, in the horizontal twin-shaft stirring device shown in FIGS. 5 and 6, the annular stirring blade 9 According to
Forms a film of high viscosity material in the gas phase and activates the surface renewal action, increasing the gas-liquid contact area, and prevents the flow of high viscosity material from the inlet side to the outlet side in the liquid. There is no such thing. In addition, although multiple stages of weir plates (not shown) are fixed to the inner wall of the main body casing 7 to improve the mixing characteristics, the high viscosity substances near the roots of the weirs are difficult to stir (and tend to become abnormal stagnation areas). In order to solve this problem, if the stirring blade is mounted close to the weir plate, there is a problem in that the agitation blade is deformed by heat or external force and comes into contact with the weir plate.

Furthermore, an apparatus provided with such a gas phase section cannot be applied to substances that solidify at the gas-liquid interface.

Another example of a mixing and stirring device for high viscosity substances without a gas phase according to the prior art is as shown in FIGS. 7 and 8. In this case, a vertical WJ shaft stirring device is used in which a plurality of stirring blades 31113 each having a scraping blade 14 at the tip are attached at a scalp angle to each other. There is a problem in that dead space is generated and mixing characteristics are limited.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for mixing and stirring high viscosity substances, which has a small gas-liquid contact area, a sufficient residence time, and excellent mixing characteristics.

[Summary of the invention]

In the present invention, two rotating shafts are arranged in parallel in an elliptical cylindrical water casing with an inlet nozzle on one end and an outlet nozzle on the other end, and a scraping blade is attached to the tip of the rotating shaft. Attach a plurality of agitating blades with a small gap between them and the inner wall of the main body casing, facing each other in the axial direction and 90 degrees out of phase with each other. A rotating partition plate with passing holes is installed close to each other with a small gap between it and the inner wall of the main body casing to prevent air flow.
By having a small liquid contact area and a sufficient residence time, it is possible to obtain a mixing/stirring device with excellent mixing characteristics ('11. An embodiment of the invention will be described with reference to FIGS. 9 to 11. Reference numeral 15 denotes an elliptical cylindrical body casing, 16 denotes a rotating shaft arranged parallel to the body casing 15 and supported by a bearing at an angle of 20 degrees; Reference numeral 17 designates a plurality of stirring blades having scraping blades 22 attached to their tips and fixed to the inner wall of the main body casing 15 with a slight gap in the axial direction of the rotating shaft 16.16. 18 and 19 are attached to the main body casing 15 with a phase shift of 90 degrees.
An inlet nozzle and an outlet nozzle for high viscosity substances are provided at one end and the other end, and a plurality of liquid passage holes are provided at the corresponding positions of the rotating shaft 16. These are rotating partition plates that are mounted close to each other with a gap between them.

In the above configuration, the high viscosity material supplied into the main casing 15 from the inlet nozzle 8 is mixed and agitated by the stirring blades 17 rotating in mutually opposite directions.
J P 藺し 1-1-纠纺 1 绿线 1 通过 η适当地输入，并从输入喷嘴19进入。 J P 藺 1 - 1 - 纵纠 1 container through η as appropriate, and taken out from the outlet nozzle 19. In this case, since the tips of the stirring blades 17 are held in a small gap with the inner wall of the main casing 15, it is possible to eliminate the air layer within the main casing 15 and significantly reduce the gas-liquid contact surface. By installing the stirring blades 17 with a phase difference of 90 degrees, the rotating shaft 16 has poor mixing properties.
Mixing and agitation can be effectively performed by mutual scraping blades around 16, and no dead space is created. In addition, by providing the rotary partition plate 21 on the rotating shaft 16.16 with a small gap between the inner wall of the main body casing 15 and the inner wall of the main body casing 15, it is possible to prevent the sheet pass and back mixing of high viscosity substances, and to The residence time can be increased.

In the above embodiment, the mixing and agitating device for high viscosity substances is described as having a vertical type main body casing. , functions similar to those described above can be provided.

FIG. 12 shows the WJ1 constant results of the δ response curve due to starch syrup for the vertical two-shaft mixing and stirring device according to the present invention and the vertical one-shaft mixing and stirring device shown in FIGS. 7 and 8rgJ. When evaluating the number of theoretical plates in a complete mixing tank array model, the single-shaft mixing/stirring device has 5 stages, while the twin-shaft mixing/stirring device has 10 stages, making it possible to improve the stirring efficiency by about twice. It is possible to downsize the device.

〔Effect of the invention〕

As described above, the present invention maintains the tips of the stirring blades mounted opposite to the two rotating shafts with a small gap from the inner wall of the main body casing, thereby eliminating the air layer in the human body casing. This makes it possible to reduce the gas-liquid contact area, and also to reduce the contact area between the two opposing agitators. The blades are installed with a 90 degree phase shift to create a dead space around the rotating shaft (and a rotating partition plate is provided with a small gap between the rotating shaft and the inner wall of the main body casing, so high viscosity materials cannot be It is possible to improve the mixing characteristics by preventing the sheet pass and back mixing, and it is possible to provide sufficient retention time.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a disk IJ extruder showing an example of the prior art, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a disc type extruder showing another example of the prior art. 4 is a sectional view taken along line BB in FIG. 3, FIG. 5 is a vertical sectional view of a stirring vane type mixing and stirring device showing another example of the prior art, and FIG. 6 is a longitudinal sectional view of the mixing and stirring device. 5 is a sectional view taken along line C in FIG.
-D sectional view, FIG. 9 is a longitudinal sectional view of a mixing and stirring device showing one embodiment of the present invention, and FIGS. 10 and 11 are E in FIG. 9.
-B and F-F cross-sectional views, Figure 12 shows δ from the starch syrup experiment.
FIG. 3 is a diagram showing measurement results of response curves. 1...High viscosity substance inlet, 2...Scree, 3゜4.7, 31.15...Body casing, 5...Curved disc, 6+8+12.16. ...rotating shaft, annular stirrer for 9...]0,14.22...
...Scraping blade, 13.17...Curved stirring blade, 18...
...Inlet nozzle, 19...Curve out nozzle, Ka・kawa・
・Bearing, 4... Rotating partition plate, Ru... Liquid passage hole. 5th figure ρ O6th figure 9th figure flO figure/6 16 tH figure

Claims (1)

[Claims] 1. Two rotating shafts are arranged in parallel in an elliptical cylindrical main body casing with an inlet nozzle on one end and an outlet nozzle on the other end, and a tip I scraping blade is attached to the rotating shaft, A plurality of agitating blades with a small gap between them and the inner wall of the main body casing are installed axially facing each other and 90 degrees out of phase with each other, so that a plurality of liquids pass through corresponding positions of the two rotating shafts. 1. A mixing and stirring device for high viscosity substances, characterized in that a rotary partition plate provided with holes is installed close to the inner wall of a main body casing with a slight gap therebetween.