JP3882440B2 - Stirrer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stirring device.
[0002]
[Prior art]
Stirring apparatuses are widely used in various applications such as reaction, extraction, crystallization, dissolution, and dilution in the chemical industry and the like.
In the agitator, when the content liquid is agitated by the agitating blade, a descending swirl flow is usually formed around the agitation shaft, so that a phenomenon has occurred in which bubbles are caught in the content liquid. The entrained bubbles cause an increase in the apparent volume of the content liquid, poor heat transfer, etc., and a method of destroying the entrained bubbles or a method of preventing the entrapment of the bubbles has been desired. In particular, when the content liquid is a high-viscosity liquid, the entrained bubbles are difficult to disappear, and it is difficult to go out of the system, so the influence of the entrained bubbles is greater.
[0003]
For this reason, various devices such as a bubble breaker and a defoaming agent have been developed so far to destroy the entrained bubbles. However, the effect of removing bubbles is not always sufficient, and further, the entrainment of bubbles is suppressed. In the past, there have been no known devices or a stirring device that suppresses the entrapment of bubbles.
[0004]
[Problems to be solved by the invention]
Under such circumstances, the present inventors diligently studied a stirring device that can suppress the entrapment of bubbles. As a result, a plate-like member having an opening at the center is formed on the inner wall of the reaction vessel, and the outer peripheral end thereof is stirred. It has been found that by inscribed between the uppermost part of the blade and the liquid interface, the entrapment of bubbles is suppressed, and the present invention has been achieved.
[0005]
[Means for Solving the Problems]
That is, in the present invention, a plate-like member having an opening at the center is formed on the inner wall of a reaction vessel having a stirring blade, and its outer peripheral end is inscribed between the uppermost portion of the stirring blade and the liquid interface. A stirrer characterized by the above is provided.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a typical embodiment of the stirring apparatus of the present invention, FIG. 2 shows a perspective view of the plate-like member of the stirring reaction apparatus of FIG. 1, and FIG. 3 shows a view of the plate-like member from above. It was.
[0007]
FIG. 1 is a typical schematic longitudinal sectional view of a stirring device 1 of the present invention. The stirring blade 2 is attached to a stirring shaft 3, and the stirring shaft 3 is connected to a stirrer (not shown). The shape of the stirring blade is not particularly limited, and for example, a circular plate type, a paddle type, an impeller type, a screw type, a turbine type, or the like is appropriately selected, and the number of blades is not limited.
[0008]
The shape, size, etc. of the reaction vessel 4 are not particularly limited, and means for heating and cooling the content liquid as necessary, for example, a jacket into which a medium for heating and cooling can be introduced, and the content liquid is drawn out of the reaction vessel An external circulation heat exchanger that performs heating, cooling, and the like is provided. Moreover, in order to improve stirring efficiency, the 1 or 2 or more baffle plate may be provided.
[0009]
The stirring device 1 of the present invention may be any device that stirs the content liquid, for example, a stirring reaction device that performs the reaction while stirring, a stirring and mixing device that stirs and mixes the content liquid, and crystals from the content liquid while stirring. Examples thereof include a stirring crystallizer for precipitation.
[0010]
The plate-like member 5 is open at the center, and is provided in the stirring device so that the outer peripheral end 6 of the plate member 5 is inscribed between the uppermost part of the stirring blade 2 and the liquid interface 8. Thereby, generation | occurrence | production of the downward swirl | vortex flow by stirring can be suppressed, and the biting of a bubble can be suppressed.
The outer peripheral shape of the plate-like member 5 may be appropriately determined according to the reaction vessel 4 and is not particularly limited.
[0011]
The opening 9 at the center may be at least large enough not to contact the stirring shaft 3 to which the stirring blade 2 is attached. In addition, if the opening area of the opening 9 is too large, the effect of suppressing the entrainment of bubbles is reduced, so the practical opening area is 0.8 times or less the plate-like member area. In addition, when the stirring blade 2 and the stirring shaft 3 can be attached to and removed from the stirring reaction device 1, it is practical that the opening 6 of the plate-like member 5 has a size that allows the stirring blade 2 to pass. preferable.
[0012]
The shape of the opening 9 is not particularly limited, and an arbitrary shape is selected. For example, a circle or an ellipse as shown in FIG. 3 or a polygon such as a rectangle as shown in FIG.
[0013]
The thickness of the plate member 5 is not particularly limited, and is arbitrarily selected in consideration of the strength of the plate member 5 and the like. Further, the material of the plate-like member 5 is not particularly limited, and examples thereof include stainless steel, hastelloy steel, resin, glass and the like, and may be appropriately selected depending on the material of the inner wall of the reaction vessel, the physical properties of the content liquid, etc. The same material as that of the inner wall 4 is used.
[0014]
The plate-like member 5 only has to be inscribed on the inner wall of the reaction vessel 4 between the uppermost part of the stirring blade 2 and the liquid interface 8 on the inner wall of the reaction vessel 4. 5 may be inscribed and fixed to the inner wall of the reaction vessel. For example, as shown in FIG. 5, two protrusions 10 may be formed at any location on the inner wall of the reaction vessel between the uppermost part of the stirring blade 2 and the liquid interface 8. Two or more plate-like members may be provided, and the plate-like member may be placed on the protrusion 10 so that the outer peripheral end 6 of the plate-like member 5 is inscribed in the inner wall of the reaction vessel. In the latter case, it is not always necessary to fix the plate-like member 5 to the projection 10 as long as the plate-like member 5 is held at a predetermined position by the projection 10. The fixing means for fixing the plate-like member 5 to the protrusion 10 is not particularly limited. For example, the plate-like member 5 may be fixed by means such as the above-described welding, or the plate-like member 5 is fitted to the protrusion 10. A fitting part may be provided, and the plate-like member 5 and the protrusion 10 may be fixed by means such as fitting. Further, an attachment portion with the inner wall of the reaction vessel 4 may be provided at the outer peripheral end 6 of the plate-like member 5, and the attachment portion may be inscribed in the inner wall of the reaction vessel 4 by means such as welding or screws.
[0015]
The plate-like member 5 is usually provided so as to be substantially parallel to the liquid interface 8, but may be provided so as to be inclined with respect to the liquid interface 8, for example.
[0016]
Further, the outer peripheral end 6 and the inner peripheral end 7 of the plate-like member 5 do not necessarily have to be on the same plane. For example, a plate-like member in which the inner peripheral end 7 is not on the same plane as the outer peripheral end 6 as shown in FIG. It may be. As shown in FIG. 7, the plate-like member whose inner peripheral end 7 is not flush with the outer peripheral end 6 is inscribed in the reaction vessel inner wall so that the inner peripheral end 7 is positioned above the outer peripheral end 6. Alternatively, as shown in FIG. 8, the inner peripheral end 7 may be inscribed so as to be positioned below the outer peripheral end 6. When the inner peripheral end 7 is inscribed so as to be positioned above the outer peripheral end 6, not only the outer peripheral end 6 but also the inner peripheral end 7 is connected to the uppermost part of the stirring blade 2 and the liquid as shown in FIG. It may be inscribed so as to be between the interface 8 or may be inscribed so that the inner peripheral end 7 of the plate-like member 5 is above the liquid interface 8 as shown in FIG. When the inner peripheral end 7 of the plate-like member 5 is inscribed so as to be above the liquid interface 8, part of the content liquid tends to stay between the plate-like member 5 and the reaction vessel inner wall. Therefore, for example, it is preferable to provide a gap between the outer peripheral end 6 of the plate-like member 5 and the inner wall of the reaction vessel as described later, or to provide an opening in the plate-like member 5.
[0017]
The inner peripheral end 7 of the plate-like member 5 may have a shape bent upward or downward as shown in FIGS. The angle of bending is not particularly limited.
[0018]
Further, the plate-like member 5 of the present invention is not necessarily continuous, and for example, as shown in FIG. 12, a combination of a plurality of plate-like small members 11 may be used. In this case, the plate-shaped small members 11 may be provided so as to overlap each other or may be provided with an arbitrary gap. Each of the small plate-like members 11 may not be the same, or a plurality of small plate-like members 11 having different shapes, sizes, etc. may be combined.
[0019]
It is not always necessary that all the outer peripheral ends 6 of the plate member 5 are inscribed in the inner wall of the reaction vessel. For example, one gap 14 is provided between the inner wall of the reaction vessel and the outer peripheral end 6 of the plate member 5 as shown in FIG. You may have two or more. If the gap is too large, the effect of suppressing the entrapment of bubbles becomes small, and is usually about 0.005 to 0.05 times the inner diameter of the reaction vessel.
[0020]
For example, as shown in FIG. 14, the plate-like member 5 may have one or more apertures 12 in addition to the central opening 9. The shape of the opening 12 is not particularly limited. The size of the opening portion 12 is arbitrary, but if it is too large, it becomes easy to bite bubbles, and practically, it is 0.1 times or less with respect to the plate-like member area. Such an opening 12 may be provided at an arbitrary position of the plate-like member 5, but the liquid above and below the plate-like member 5 can be mixed through the opening 12. In consideration of stirring and mixing the content liquid more uniformly, it is preferable that the liquid is provided on the plate member 5 substantially evenly. An example of a stirring device in which a plate-like member having such an opening is inscribed in the inner wall of the reaction vessel is shown in FIGS. 15 to 17, and the edge 13 of the opening 12 is shown in FIGS. 15 to 17. As described above, the plate member 5 may be bent upward or downward, and the bending angle is not particularly limited.
[0021]
Further, the plate-like member 5 may have one or two or more notches 15 as shown in FIG. 18 at any position of the plate-like member.
[0022]
【The invention's effect】
According to the stirrer of the present invention, it is possible to suppress the occurrence of a swirling downward flow around the stirring shaft and to suppress the entrapment of bubbles.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of a typical embodiment of a stirring apparatus according to the present invention.
2 is a perspective view of a plate-like member of the stirring device in FIG. 1. FIG.
3 is a view of the plate-like member of FIG. 2 as viewed from above.
FIG. 4 is a top view of a plate-like member having a square opening at the center.
FIG. 5 is a schematic longitudinal sectional view of a stirring device in which a protrusion is provided on the inner wall of a reaction vessel and a plate-like member is placed on the protrusion and fixed.
FIG. 6 is a perspective view of a plate-like member whose inner peripheral end is not on the same plane as the outer peripheral end.
7 is a schematic longitudinal sectional view of a stirring device in which the plate-like member of FIG. 7 is inscribed so that its inner peripheral end is above the outer peripheral end and its inner peripheral end is below the liquid interface. FIG.
8 is a schematic longitudinal sectional view of a stirring device in which the plate-like member of FIG. 7 is inscribed so that the inner peripheral end thereof is below the outer peripheral end.
9 is a schematic longitudinal sectional view of a stirrer in which the plate-like member of FIG. 7 is inscribed so that its inner peripheral end is located above the outer peripheral end and its inner peripheral end is located above the liquid interface. FIG.
FIG. 10 is a schematic longitudinal sectional view of a stirrer in which a plate-like member whose inner peripheral end is bent downward is inscribed.
FIG. 11 is a schematic longitudinal sectional view of a stirrer in which a plate-like member whose inner peripheral end is bent upward is inscribed.
FIG. 12 is a schematic cross-sectional view of a stirring device when a plurality of small plate-like members are combined.
FIG. 13 is a schematic cross-sectional view of a stirring device having a gap between the inner wall of the reaction vessel and the outer peripheral end of the plate-like member.
FIG. 14 is a top view of a plate-like member having an opening.
FIG. 15 is a schematic longitudinal sectional view of a stirrer in which a plate-like member having an opening portion whose edge is bent downward is inscribed;
FIG. 16 is a schematic longitudinal sectional view of a stirrer in which a plate-like member having an opening portion whose edge is bent upward is inscribed;
FIG. 17 is a schematic longitudinal sectional view of a stirrer in which another plate-like member having an opening portion whose edge is bent downward is inscribed.
FIG. 18 is a view of a plate-like member having a notch as viewed from above.
[Explanation of symbols]
1 .... Agitator, 2 .... Agitator blade, 3 .... Agitator shaft, 4 .... Reaction vessel,
5. Plate member, 6. Outer peripheral edge, 7. Inner peripheral end, 8. Liquid interface,
9 .. Opening portion 10.. Protrusion 11.. Small plate-shaped member 12.
13 .... Edge, 14 .... Gap, 15 .... Notch

Claims (3)

On the inner wall of the reaction vessel having a stirring blade, a plate-like member having a central portion opened so as to be substantially parallel to the liquid interface, the outer peripheral end of the stirring blade is the uppermost portion of the stirring blade and the liquid interface. A stirring device comprising one or more gaps between the reaction vessel and the outer peripheral end of the plate-like member. The stirring apparatus according to claim 1, wherein the gap is 0.005 to 0.05 times the inner diameter of the reaction vessel. The stirrer according to claim 1 or 2, wherein, besides the central opening, the stirring device has one or two or more apertures of 0.1 times or less with respect to the plate member area.

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