JP4132574B2 - Stirrer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention particularly relates to a stirring device in which a liquid in a stirring tank and a hardly soluble powder are stirred, mixed, and dissolved by mechanical means.
[0002]
[Prior art]
Conventionally, typical of such stirring devices are roughly classified into a radial flow type and an axial flow type from a liquid flow pattern, and the former radial flow type is represented by a paddle type or a turbine type stirring blade. In this case, the flow is generated in the radial direction of the blade by the centrifugal action of the blade rotation, and the latter axial flow type flows axially by the thrust in the rotation axis direction as represented by the propeller type stirring blade. Is generated.
However, in any of the agitation devices, the agitating and mixing is mainly performed by the circulation ability of the liquid in the agitation tank. The current situation is extremely low.
[0003]
Therefore, the present applicant, as Japanese Patent Application No. 8-121131, is a stirring device in which a mixing rotating body attached to a rotating shaft connected to a rotation driving source is disposed in a liquid in a stirring tank, and mixing rotation The body is composed of two upper and lower circular plates, and an inflow port is formed at the center of the upper circular plate, and a large number of cylindrical chambers opening forward are arranged on the front surfaces facing each other. The upper rotating disk chamber and the lower disk chamber are arranged in different positions so that each chamber communicates with the other facing chambers, so that the mixed rotating body attached to the rotating shaft When a liquid passes through the flow path, it is made to flow in a complicated state in which collision, dispersion, merging, meandering, vortex flow, etc. are combined, and in addition to the circulation action in the stirring tank At the same time, high shearing action was given to improve mixing efficiency. It has developed a 拌 equipment.
[0004]
[Problems to be solved by the invention]
However, in the above stirring device, the movement of the liquid below the mixing rotating body is weak and less, so for example, when stirring the liquid in order to dissolve the poorly soluble granular material in the liquid, the poorly soluble powder There was a problem that had to be solved, for example, a part of the granule accumulated without melting in the center of the bottom of the stirring tank.
[0005]
[Means for Solving the Problems]
The present invention is based on the above prior art, and in view of the problem that hardly soluble powder particles are difficult to dissolve, the bottom surface of the lower disk in the mixing rotating body is provided with an agitating plate, for example, to provide an uneven surface. The above-mentioned problem is solved by generating a strong vortex below and winding up the hardly soluble powder particles that have accumulated without melting in the center of the bottom of the stirring tank and sucking them into the mixing rotating body.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view of a stirring device according to the present invention, FIG. 2 is an exploded perspective view of a mixing rotator, FIG. 3 is a cross-sectional view of the mixing rotator, and FIG. FIG. 5 is a bottom view of the upper disk in the mixing rotator, FIG. 6 is a diagram showing the communication arrangement of the chambers in the mixing rotator, and FIG. FIG. 8 is a diagram showing a communication arrangement state of the small chambers in the mixed rotating body, FIG. 8 is a diagram showing a communication arrangement state of the small chambers in the mixing rotary body having a square shape, and FIG. 9 is an octagonal shape of the chambers. FIG. 10 is a diagram showing a communication arrangement state of each chamber in the mixing rotator provided with protrusions in the small chamber, and FIG. 11 is a diagram showing the mixing rotation of FIG. FIG. 12 is a bottom view of a mixed rotating body of three patterns.
As shown in FIG. 1, the stirring device 1 according to the present invention uses a mixing rotating body 3 disposed in the liquid in the stirring tank 2 as a rotational drive source 4 such as a motor, as in the above-described conventional stirring device. Although it is configured to be attached to the connected rotating shaft 5, the bottom surface of the mixed rotating body 3 is an uneven surface.
[0007]
In the mixed rotating body 3, as shown in FIGS. 2 to 6, the upper and lower two discs 6 and 7 are formed as a set, and these are overlapped, and the center of the lower disc 7 is formed. In addition to forming the inflow port 8, the front surface facing each other, that is, the lower disk 7, has a polygonal shape in a plan view opening forward on the lower side around the inflow port 8 on its upper surface. A plurality of cylindrical chambers 9, 9 a... Are formed and arranged on the bottom surface of the upper disk 6 in the same manner as described above. Are arranged in a large number.
When the end surfaces 11 of the side walls 10 forming the small chambers 9, 9a of the discs 6 and 7 are brought into close contact with each other and overlapped vertically, as shown in FIGS. The small chambers 9, 9a ... and the small chambers 9, 9a ... of the lower disk 7 are arranged at different positions so that the small chambers 9, 9a ... communicate with the other small chambers 9, 9a ... facing each other. .
[0008]
Moreover, in the said embodiment, although the planar view shape of the small chambers 9, 9a ... was formed as a hexagon and a large number of them were arranged in a honeycomb shape, it is not limited to such a shape, and as shown in FIGS. The planar view shape of the small chambers 9, 9a may be triangular, quadrangular, octagonal, etc., or may be circular (not shown).
[0009]
Further, as another embodiment of the upper and lower circular disks 6 and 7, as shown in FIGS. 10 and 11, side walls forming the small chambers 9, 9a... By providing the protrusion 12 that is lower than the height to the end face 11 of 10, it becomes possible to positively cause disturbance in the flow of the fluid, and the protrusion 12 gradually becomes smaller as it approaches the center of the disks 6 and 7. By doing so, the inner volume of the outer and inner sides in the diameter direction of the small chambers 9, 9 a... Arranged in the circumferential direction can be made uniform, and pulsation can be prevented to ensure a smooth flow.
[0010]
Further, as a means for fixing the upper and lower two discs 6 and 7 in an overlapped state, as shown in FIG. 2, a circular circle on the outer peripheral side in which the small chambers 9, 9a. It is fixed at appropriate positions in the circumferential direction using screw coupling means 13 such as bolts and nuts.
In order to prevent the conical space generated on the upper disk 6 from being caught in the liquid during the stirring by the mixing rotating body 3, the screw coupling means 13 of the upper and lower disks 6, 7 are arranged on the outer periphery. In order to prevent the conical space from being caught in the liquid, the upper surface of the upper disk 6 is preferably flat.
[0011]
Further, when the mixing rotating body 3 is attached below the rotating shaft 5 in the rotational drive source 4, the rotating shaft 5 is moved downward through the center of the inlet 8 of the upper disk 6 as shown in FIGS. The disk 7 is directly attached to the center of the disk 7 by a screw coupling means 14 such as a screw part below the rotating shaft 5 and a nut member.
For example, when the mixing rotating body 3 is detachably attached to the rotary drive source 4 below the rotary shaft 5, a mounting portion 15 for the rotary shaft 5 is provided at the center of the upper surface of the upper disk 6 and the mounting portion 15. An insertion hole 15a of the rotary shaft 5 is formed at the center of the upper surface of the rotary shaft 5, the lower end of the rotary shaft 5 is inserted into the insertion hole 15a, and the tip of the fixing screw 16 screwed from the side of the mounting portion 15 is inserted into the rotary shaft 5 The mixing rotator 3 is mounted on the rotary shaft 5 so that the inlet 8 is positioned below the mixing rotator 3.
The screw coupling means 13 and 14 are not limited to the above-described configuration. In short, the two disks 6 and 7 can be overlapped and fixedly connected, and the rotating shaft 5 can be fixedly attached to the mixed rotating body 3. Any structure can be used as long as it can be connected to the base.
[0012]
As shown in FIG. 12, the uneven surface formed on the bottom surface of the mixed rotating body 3 is formed by fixing the stirring plates 20, 20 a... On the bottom surface of the lower disk 7. Specifically, a flat stirring plate 20, 20a as shown in FIG. 12 (a) or a curved stirring plate 20, 20a as shown in FIG. Are fixed to the bottom surface of the disk 7 and arranged at equal intervals in the circumferential direction.
Further, in the stirring plates 20, 20a... Shown in FIGS. 12 (a) and 12 (b), they are fixed perpendicularly to the bottom surface of the lower disk 7, but as shown in FIG. 12 (c). Alternatively, the stirring plates 20, 20a,... May be fixed with being inclined with respect to the bottom surface of the lower disk 7.
In the drawing, the number of the stirring plates 20, 20a is six. However, the number is not limited to any number, and the shape of the stirring plates 20, 20a is a flat plate shape or a curved plate shape. It is not limited at all.
[0013]
Next, the operation of the stirring device according to the present invention will be described.
By rotating the mixing rotator 3 disposed at an appropriate position in the liquid in the agitation tank 2 by the rotation drive source 4, the liquid sucked from the inlet 8 of the mixing rotator 3 and the hardly soluble powder are mixed. The fluid flows inside the rotating body 3 and is discharged from the outer peripheral side by centrifugal force. As a result, a circulating liquid flow as shown by the arrow in FIG. Various mixing effects are given to the liquid flowing inside. Here, regarding various mixing actions on the liquid by the mixing rotator 3, the flow of the liquid inside the mixing rotator 3 is, for example, from the inlet 8 of the upper disk 6 in the mixing rotator 3 as shown by an arrow in FIG. 3. The liquid to be sucked changes its direction because the straight path is blocked by the lower disk 7 and collides radially from the central part to the outside through the small chambers 9, 9 a, which communicate with each other, disperse, merge, meander, vortex Etc. are combined and flow in a complicated manner, and finally discharged radially from the outer peripheral side of the mixing rotor 3.
Further, as described above, the fluid collides with the bottom surface and the side wall 10 of each of the small chambers 9, 9a, disperses from each of the small chambers 9, 9a, to the other plurality of small chambers 9, 9a, and the plurality of small chambers 9, 9a. ... from one of the small chambers 9, 9a, meandering, meandering, and hydrodynamic shear due to vortex flow caused by inflow from the plurality of small chambers 9, 9a ... into each of the small chambers 9, 9a ... By hydrodynamic shear when passing through an orifice, which is a communication path from one chamber 9 to another chamber 9, 9a, crushing by impact fracture, shearing when passing through the end face 11 of the side wall 10, mechanical cavitation, etc. Dispersion mixing is performed.
Therefore, the circulation of the liquid can be generated in the agitation tank 2 by the rotation of the mixing rotator 3, and the liquid that generates the circulatory flow passes through the mixing rotator 3 to each of the small chambers 9, 9 a. By the complicated flow path formed by ..., a complicated flow state in which collision, dispersion, merging, meandering, vortex flow, etc. are combined, so that in addition to the circulating action in the stirring tank 2, at the same time in the mixing rotator 3 Since a high shearing action is given to the liquid, it has completely different mixing / dispersing capabilities and can be used for various mixing operations, and the complicated flow path can be obtained by simply overlapping the two disks 6 and 7. Since it can be formed, the structure becomes simple.
[0014]
Further, the total number of dispersions of the mixing rotator 3 is determined by the number of the small chambers 9, 9a in the upper and lower circular disks 6, 7 arranged radially from the center, for example, a hexagonal shape in plan view shown in FIG. If it is a thing, the number of rooms is 6 rooms, 12 rooms, 18 rooms (36 rooms in total) 3 rows of discs 6 and the number of rooms is 3, 9 rooms, 15 rooms (27 rooms in total) 3 rows The total number of dispersions in the case of a total of one fluid of the mixed rotating bodies 3 in which the circular discs 7 are polymerized reaches several thousand, and if it is two or more fluids, it is naturally a multiplier product.
The total number of dispersions is the number of fluids that should be generated while passing through the mixing rotor 3 by the small chambers 9, 9 a.
[0015]
Further, the projections 12 formed in the small chambers 9, 9a can positively cause disturbance in the fluid flow, and the mixing ability in the mixing rotating body 3 is further improved.
[0016]
Moreover, since the strong vortex | eddy_current generate | occur | produces also under the mixing rotary body 3 by the stirring plate 20, 20a ... in the mixing rotary body 3 of a rotation state, the hardly soluble powder granular material collected in the bottom center of the stirring tank 2 is It is wound up and sucked into the mixing rotator 3 from the inlet 8 and is discharged from the outer peripheral side and circulated.
[0017]
【The invention's effect】
(1) In the first aspect of the present invention, the liquid sucked from the inlet of the mixing rotator flows inside the mixing rotator and is discharged from the outer peripheral side by centrifugal force to circulate the liquid in the stirring tank. In the stirring device in which a flow is generated, a stirring plate is provided in the circumferential direction on the bottom surface of the lower disk, and the stirring plate is wound up from the center of the bottom of the stirring tank and sucked into the mixing rotor from the inlet. Because it is configured to generate eddy currents, the insoluble powder particles collected at the bottom center of the stirring tank are wound up by the strong vortex generated below the mixing rotator and sucked into the mixing rotator from the inlet. It is possible to dissolve the hardly soluble powder particles in the liquid in a short time and uniformly.
(2) In the present invention described in claim 2, since the stirring plate is a curved plate, it can be smoothly rotated while suppressing the resistance during rotation of the mixing rotating body, and the load on the rotational drive source can be suppressed. Its practical effect is great.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of a stirrer according to the present invention.
FIG. 2 is an exploded perspective view of a mixing rotating body.
FIG. 3 is a cross-sectional view of a mixing rotator.
FIG. 4 is a plan view of a lower disk in the mixed rotating body.
FIG. 5 is a bottom view of an upper disk in a mixed rotating body.
FIG. 6 is a diagram showing a communication arrangement state of the small chambers in the mixing rotating body.
FIG. 7 is a diagram showing a communication arrangement state of the small chambers in the mixed rotating body in which the small chambers have a triangular shape.
FIG. 8 is a diagram showing a communication arrangement state of the small chambers in the mixed rotating body in which the small chambers have a square shape.
FIG. 9 is a diagram showing a communication arrangement state of the chambers in the mixed rotating body in which the chambers are octagonal in shape.
FIG. 10 is a diagram illustrating a communication arrangement state of each chamber in the mixed rotating body in which the protrusion is provided in the chamber.
11 is a central longitudinal sectional view of the mixing rotating body of FIG.
FIG. 12 is a bottom view of a three-pattern mixing rotor.
[Explanation of symbols]
2 Stirrer 3 Mixing rotator 4 Rotation drive source 5 Rotating shaft 6 Disc 7 Disc 8 Inlet 9, 9a ... Small chamber
20, 20a… Stirring plate

Claims (2)

In the liquid in the stirring tank, a stirring device in which a mixing rotating body attached to a rotating shaft connected to a rotation driving source is disposed,
The mixing rotator attached below the rotating shaft has a pair of upper and lower disks stacked together, forming an inflow port in the center of the lower disk, and on the front surface facing each other, on the front A large number of open cylindrical chambers are arranged, and the upper disc chamber and the lower disc chamber are arranged in different positions so that each chamber communicates with another opposing chamber. And configure
In the stirring device in which the liquid sucked from the inlet of the mixing rotator flows inside the mixing rotator and is discharged from the outer peripheral side by centrifugal force so that a circulating flow of liquid is generated in the stirring tank.
A stirring plate is provided in the circumferential direction on the bottom surface of the lower disk, and the stirring plate is wound up from the center of the bottom of the stirring tank to generate a vortex that is sucked into the mixing rotor from the inlet. A stirrer.   The stirring device according to claim 1, wherein the stirring plate is a curved plate.

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