JP7061476B2 - Stirrer - Google Patents

Description

The present invention relates to a stirring device mainly for dissolving powder, which is used in the production of pharmaceuticals, cosmetics, foods, paints, chemicals, etc., and is used for efficiently dissolving raw material powder in a liquid. ..

Stirrers are widely used in fields that include stirring processes such as mixing, dispersion, emulsification, dissolution, and atomization in the product manufacturing process, particularly in the manufacturing fields of pharmaceuticals, cosmetics, foods, paints, chemicals, and the like. Of these, a powder dissolution tank is mainly used for agitation treatment involving dissolution of powder or the like. As a stirring device for dissolving powder, for example, there is a stirring device disclosed in Patent Document 1 (FIG. 10).
This agitator connects the liquid, which is a mixture of powder and solvent, from the bottom of the tank to the upper part of the container via the disperser (crusher) while processing the liquid in the tank equipped with the agitator. By circulating the agitated object through the circulation path outside the tank, the powder is dissolved while the upper and lower parts of the agitated object in the tank are constantly switched.
According to this method, even when dissolving powders that easily form lumps (for example, dissolving PVA powders in water), the time required for dissolution is shortened, foaming at the completion of dissolution is suppressed, and undissolved substances are dissolved. It is said that it will be possible to dissolve without residual.

However, in the stirring device and the like disclosed in Patent Document 1, in order to further improve the dispersion of the powder in the solvent, it is important to concentrate the force of the stirring blade on a small part of the object to be treated. ..
On the other hand, in order to further improve the mixing in the stirring device, it is important to apply the force of the stirring blade to the entire processing object contained in the container to make it flow. In this way, enhancing the dispersion and mixing with one stirring blade is required to achieve both contradictory behaviors.
In particular, the higher the viscosity of the object to be treated, the more difficult it becomes to improve the dispersion and mixing.

As an effective means for solving this problem, the inventor of the present application has proposed a stirring device disclosed in Patent Document 2 (FIG. 11).
The stirring blade used in this stirring device is a stirring blade that is rotated around the axial direction, and is a base portion and a plurality of blade portions located on one side in the axial direction with respect to the base portion and arranged in the rotational direction. It is provided with a blade group including, and has a front curved portion in which the blade portion is connected to the inner end in the radial direction and is convex forward in the rotational direction in the axial direction (FIG. 12).

One of the factors for the sophistication of mixing by the stirring blade of Patent Document 2 is the contribution of the forward curved portion of the blade portion. As a result of verification by the inventors, by making the front curved portion convex forward in the rotation direction, the object to be processed is strongly sucked at the inner end, and the sucked object to be processed is moved outward in the radial direction. It is moving more smoothly, confirming that this contributes to the sophistication of mixing.
Thereby, the above-mentioned problem can be solved. For example, even when a powder having a small specific gravity that is difficult to be compatible with the solvent is dissolved by floating near the liquid surface of the solvent, the powder is efficiently dissolved while being sucked to the vicinity of the bottom of the container. Processing can be performed.

Such a stirring blade of Patent Document 2 can be applied to a melting device to form a single-screw composite mixer with a container bottom as shown in FIG. In the single-screw composite mixer with a container bottom, a rotating body having different roles of the stirring blade 201 and the high-pressure pump impeller 202 is fixed to the rotating shaft 203 protruding from the bottom of the container.
Of these, the mixing blade 201 has a function of uniformly mixing the agitated object T in the container, while the high-pressure pump impeller 202 applies a shearing force to the agitated object to disperse, emulsify, dissolve, atomize, and the like. It has a function to perform operations.
The high-pressure pump impeller 202 also has a function of a high-pressure pump, sucks the agitated object T from the discharge port 204 at the bottom of the container, transfers it to the upper part of the container via the pipe 205 outside the container, and transfers it to the upper part of the container. It has a function of circulating the stirring object T.
In addition, since the stirring blade 201 and the high-pressure pump impeller 202 are fixed to one drive unit in the single-axis compound mixer with a container bottom, the device can be manufactured at a lower cost than the device composed of different drive units. There is a merit that can be done.

However, when the processing is performed by increasing the peripheral speed of the stirring blade 201 in the single-screw composite mixer with a bottom of the container, the stirring object T swirls and flows in the container at high speed, and a tornado-shaped so-called air suction vortex 206 is generated. In the center of the container, a cavity may be formed in which the object to be agitated does not exist (FIG. 13).
Further, when the peripheral speed of the stirring blade 201 increases and the air suction vortex 206 develops and the lower end of the vortex reaches the discharge port 204 at the bottom of the container, air is sucked into the accommodation chamber of the high pressure pump impeller 202.
This causes a problem that the shearing force of the high-pressure pump impeller 202 is reduced, and the actions of dispersion, emulsification, dissolution, and atomization on the agitated object T are reduced.

As a means for preventing the air suction vortex 206 from reaching the discharge port 204 at the bottom of the container, a method of partially attenuating the flow of the agitated object T can be considered. For example, in the stirring device (mixing device) disclosed in Patent Document 3 (FIG. 14), a baffle (disturbing plate) as shown in FIG. 15 is arranged on the inner wall of the container so as to be close to the stirring blade (stirring blade). By doing so, the flow of the agitated object is attenuated, and the mixing of bubbles into the agitated object is suppressed.

Japanese Unexamined Patent Publication No. 2006-20571 International Publication No. 2017/221935 Japanese Unexamined Patent Publication No. 2007-136432

In a single-screw compound mixer with a container bottom, if a method of bringing the baffle close to the stirring blade is adopted, the problem that an air suction vortex develops and the lower end of the vortex reaches the discharge port of the container bottom can be solved. However, the original effect of the stirring blade of Patent Document 2 that the stirring object is strongly sucked and moves more smoothly outward in the radial direction and the sophistication of mixing can be achieved is significantly diminished.
For this reason, it has been considered unsuitable to adopt a method of arranging a baffle in a single-screw composite mixer with a container bottom.

As a result of diligent studies by the inventor of the present application, even if the baffle is originally unsuitable for the single-screw compound mixer with a bottom of the container, (1) the positional relationship between the stirring blade and the baffle, (2) the shape of the baffle, And (3) It was found that by reviewing the method of arranging the baffle in the container, it can be effectively utilized for solving the conflicting problems of sophistication of mixing and prevention of deterioration of the action of emulsification, dissolution and atomization. , The present invention has been completed.

Specifically, the stirring device of the present invention is a stirring device including a stirring blade and a baffle in a container, and the stirring blade is located on one side of the base portion and the base portion in the axial direction and rotates. A group of blades composed of a plurality of blades arranged in a direction is provided, and the blades are connected to an inner end in the radial direction and are convex forward in the axial direction in the axial direction. The container has an inclined bottom in which the bottom of the inner wall of the container is inclined like a funnel, and the baffle has a plurality of fins directed outward from the center of the baffle on the inclined bottom of the container. The stirring blade and the baffle are arranged so as to be radial and curved or bent in the direction opposite to the rotation direction of the stirring blade, and the stirring blade and the baffle do not face the axial rotation direction of the stirring blade and are concentric. The baffle is arranged on an extension line in the discharge direction of the stirring object of the stirring blade.
The direction in which the agitated object is discharged from the baffle is the direction toward the outside from the center of the baffle (claim 1).

The stirring device has an outlet for the object to be agitated at the bottom of the container and a discharge port for the object to be agitated at the top of the container. It is preferable to have a circulating means (claim 2).
Further, it is preferable that the external circulation means has a means for transferring the agitated object from the discharge port to the discharge port (claim 3).
Further, the transfer means is preferably a high pressure pump impeller (claim 4).
Further, it is preferable that a shower nozzle is arranged at the discharge port (claim 5).

On the other hand, it is preferable that the blade portion has a rear curved portion that is connected to the front curved portion outward in the radial direction and is convex rearward in the rotational direction in the axial direction (claim 6). ).
More preferably, the blade portion is tilted so as to be positioned forward in the rotational direction so as to be separated from the base portion in the axial direction (claim 7).
More preferably, the inclination angle of the blade portion with respect to the axial direction is larger toward the inward direction in the radial direction (claim 8).

According to the configuration of the present invention, the flow component of the stirring object generated by the stirring blade is converted into a flow component that swirls in the direction opposite to the axial rotation direction of the stirring blade, and swivels in the direction opposite to the axial rotation direction of the stirring blade. An air suction vortex can be created (Fig. 1).

Specifically, as shown in FIG. 1, the flow direction of the stirring object T generated by the stirring blade A2 is in the direction opposite to the rotation direction of the stirring blade A2 due to the interaction between the baffle A11 and the inclined portion of the container A1. It is converted into a flowing flow component C, thereby generating an air suction vortex V that swirls in the direction opposite to the rotation direction of the stirring blade A2.
The flow in the direction opposite to the rotation direction of the stirring blade A2 is combined with the flow in the same direction as the rotation direction of the stirring blade A2 generated in the vicinity of the stirring blade A2 and in the vicinity directly above the stirring blade A2. Therefore, the air suction vortex V that swirls in the direction opposite to the rotation direction of the stirring blade A2 disappears in the vicinity immediately above the stirring blade and does not reach the first discharge port A6 at the bottom of the container.

As a result, it is possible to avoid problems such as a decrease in the shearing force of the high-pressure pump impeller A4 and a decrease in the actions of dispersion, emulsification, dissolution, and atomization.
On the other hand, due to the action of the stirring blade A2, the object T to be processed is strongly sucked from above the container A1 toward the stirring blade A2, and is smoothly moved and discharged outward in the radial direction of the stirring blade A2 to achieve a high degree of mixing. The original effect of the stirring blade A2 that the agitation can be achieved is maintained by the swirling flow in the direction opposite to the rotation direction of the stirring blade A2.
As described above, it is possible to solve both the conflicting problems such as the sophistication of mixing and the prevention of deterioration of the actions of dispersion, emulsification, dissolution and atomization.

Other features and advantages of the invention will be more apparent by the detailed description given below with reference to the accompanying drawings.

It is a schematic diagram which shows one Embodiment of the stirring apparatus which concerns on this invention. It is a perspective view which shows the stirring blade used for the stirring apparatus which concerns on this invention. It is a front view which shows the stirring blade used for the stirring apparatus which concerns on this invention. It is a top view which shows the stirring blade used for the stirring apparatus which concerns on this invention. It is a top view which shows the baffle used for the stirring apparatus which concerns on this invention. It is a front view which shows the baffle used for the stirring apparatus which concerns on this invention. It is a top view which shows the modification of the baffle used for the stirring apparatus which concerns on this invention. It is a top view which shows the state which combined the stirring blade and the baffle used for the stirring apparatus which concerns on this invention. It is a front view which shows the state which combined the stirring blade and the baffle used for the stirring apparatus which concerns on this invention. It is a schematic diagram which shows the stirring apparatus which concerns on a conventional example. It is a schematic diagram which shows the stirring apparatus which concerns on a conventional example. It is a perspective view which shows the stirring blade used for the stirring apparatus which concerns on a conventional example. It is a schematic diagram which shows the stirring apparatus which concerns on a conventional example. It is a schematic diagram which shows the stirring apparatus which concerns on a conventional example. It is a schematic diagram which shows the stirring blade and the baffle used for the stirring device which concerns on a prior art example.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. 1 to 9 show an embodiment and a modification of the stirring device according to the present invention.

The stirring device A shown in FIG. 1 is a stirring device mainly for dissolving powder, and efficiently dissolves raw material powder used in the production of pharmaceuticals, cosmetics, foods, paints, chemicals, etc. into a liquid. It is a stirring device for.

The stirring device A is a so-called single-screw composite mixer with a bottom of a container, and a stirring blade A2 is arranged in the container A1, and a high-pressure pump impeller A4 is arranged in a storage chamber A3 arranged directly under the container A1. Has been done.
The mixing blade A1 and the high-pressure pump impeller A2 are fixed to a rotating shaft A5 that penetrates the storage chamber A3 and protrudes from the bottom of the container A1 toward the inside of the container. A shaft seal (not shown) is provided between the accommodation chamber A3 and the rotary shaft A5, and the rotary shaft A5 is connected to a motor (not shown). The stirring blade A2 and the high-pressure pump impeller A4 have a structure in which they rotate integrally in the direction shown in FIG. 1 by the driving force of this motor.
As other components, for example, a housing that supports the container A1 and the motor, a control unit that controls the drive of the motor, and the like may be appropriately adopted.

The stirring object T charged into the container A1 flows by the rotation of the stirring blade A2 and is uniformly mixed. The mixing blade A2 causes a unique flow with respect to the agitated object, and its form and function will be described in detail later.
Further, a first discharge port A6 is formed in the center of the bottom of the container A1, and the container A1 and the storage chamber A3 are connected to each other via the first discharge port A6. As a result, the stirring object T in the container A1 can be transferred to the accommodation chamber A3 by the suction force of the high-pressure pump impeller A4. Shear force is applied to the agitated object T transferred and accommodated in the accommodation chamber A3 by the rotation of the high-pressure pump impeller A2, and various agitation operations such as dispersion, emulsification, dissolution, and atomization are performed.

A second discharge port A7 is formed on the side surface of the storage chamber A3, and a pipe A8 extending toward the upper part of the container 3 is connected to the second discharge port A7.
The other end of the pipe A8 is inserted into the container 3 from the upper part of the container A1, and the stirring object T transferred from the first discharge port A6 via the second discharge port A7 is the pipe A7. It is designed to be discharged into the container A1 from the discharge port A9 at the tip portion. As a result, the above series of processes can be performed while constantly circulating the stirring target portion T in the container A1.

A funnel-shaped inclined portion A10 is formed at the bottom of the container A1 from the lower end of the side wall of the container A1 toward the center of the container, and the baffle A11 is arranged along the surface of the inclined portion A10. There is.
The baffle A11 is linked with the stirring blade A2 and the inclined portion A10 to generate a unique flow C with respect to the stirring target T, and its form and function will be described in detail later.
The baffle A11 and the stirring blade A2 are arranged so as to have a concentric positional relationship with the rotation axis A5 as the center.
Further, the baffle A11 is arranged so as to be interposed between the surface of the inclined portion A10 and the stirring blade A2, and does not face the stirring blade A2 in the radial direction of the rotating shaft A5.
This is to ensure that the baffle A11 is arranged on the extension line of the stirring blade A2 in the discharge direction of the stirring target, as will be described in detail later.

Next, the form, function, and the like of the stirring blade A2 will be described in detail.
The stirring blade A2 has the form shown in FIGS. 2 to 4. FIG. 2 is a perspective view showing the stirring blade A2. FIG. 3 is a front view showing the stirring blade A2. FIG. 3 is a plan view showing the stirring blade A2 seen from the upper side in the z direction in FIGS. 1 and 2. The rotation direction θ is a direction in which the stirring blade A2 rotates, and is a direction generally referred to as a circumferential direction with respect to the axial direction z and the radial direction r. Further, the arrows in these figures indicate the direction in which the stirring blade A1 rotates.

The material of the stirring blade A2 is not particularly limited, and a material suitable for dispersing and mixing the stirring target T such as metal or resin is appropriately selected. As a preferable metal constituting the stirring blade A2, for example, stainless steel can be mentioned. Further, the stirring blade A2 may have the base 1 and the blade group 2 integrally formed, or may have a configuration in which a plurality of parts are combined. Further, as a structure for attaching the stirring blade A2 to the rotating shaft A5 of the stirring device B1, attachment mechanisms such as various engaging mechanisms and fastening mechanisms may be adopted, or at least a part of the rotating shaft A5 and the stirring blade A2. It may be a structure in which and is integrally formed. In FIGS. 2 to 4, the structure for attaching the stirring blade A2 to the rotating shaft A5 is omitted for convenience of understanding. The size of the stirring blade A2 is not particularly limited, and in the present embodiment, the diameter of the stirring blade A2 is about 40 mm.

The base portion 1 supports the blade group 2 and is a portion fixed to the rotation shaft A5. The shape and size of the base 1 are not particularly limited. The base 1 of the present embodiment has a circular shape in the axial z-view. The base 1 has an outer peripheral end 10 and an inclined surface 11. The outer peripheral end 10 is a portion located on the outermost side in the radial direction r. In the present embodiment, the outer peripheral end 10 is located at the lower end of the axial z of the base 1, and is circular in the axial z view. The inclined surface 11 is provided on the z upper side in the axial direction with respect to the outer peripheral end 10. The inclined surface 11 is inclined so as to be located outward in the radial direction r toward the outer peripheral end 10 in the axial direction z. In the illustrated example, the entire base 1 is a cone, and the inclined surface 11 is composed of the side surfaces of the cone.

The blade group 2 is composed of a plurality of blade portions 20 located on one side in the axial direction z with respect to the base portion 1 and each of which is arranged in the rotation direction θ. In the present embodiment, the blade group 2 is provided on the inclined surface 11. As shown in FIG. 2, the plurality of blade portions 20 constituting the blade group 2 are arranged in a predetermined range in the axial direction z.

The number of the plurality of blade portions 20 constituting the blade group 2 is not particularly limited. In the present embodiment, the number of the plurality of blade portions 20 constituting the blade group 2 is four. Further, the four blade portions 20 are arranged at equal pitches, and in the illustrated example, the pitch is 90 degrees.

The blade portion 20 has an inner end 21, an outer end 22, a root end 23, a tip 24, a front surface 25, a rear surface 26, a front curved portion 27, and a rear curved portion 28. The inner end 21 is the innermost end of the blade portion 20 in the radial direction r. In the present embodiment, the inner ends 21 of the plurality of blade portions 20 are separated from each other in the rotation direction θ. The outer end 22 is the outermost end of the blade portion 20 in the radial direction r. As shown in FIG. 4, in the illustrated example, the outer end 22 coincides with the outer peripheral end 10 of the base 1 in the axial z-view. That is, either the base portion 1 or the blade portion 20 is not configured to project outward in the radial direction. However, the blade portion 20 may be configured to project outward from the base portion 1 in the radial direction r, or may be configured to retract inward in the radial direction r from the base portion 1.

The root end 23 is a portion where the blade portion 20 is connected to the base portion 1. The tip 24 is an end of the blade portion 20 located in the axial direction z from the root end 23.

The front surface 25 is a surface of the blade portion 20 on the front side in the rotation direction θ. The rear surface 26 is a surface of the blade portion 20 on the rear side in the rotation direction θ.

The forward curved portion 27 is a portion connected to the inner end 21 and convex in the rotational direction θ forward in the axial z view. More specifically, the front curved portion 27 has a shape that is convex forward in the rotation direction θ with respect to the virtual straight line connecting both ends of the radial direction r of the front curved portion 27. The rear curved portion 28 is a portion that is connected to the front curved portion 27 in the radial direction r outward and is convex in the rotational direction θ rearward in the axial direction z.
More specifically, the rear curved portion 28 has a shape that is convex backward in the rotation direction θ with respect to the virtual straight line connecting both ends of the radial direction r of the rear curved portion 28. In FIGS. 2 and 4, the range of the forward bending portion 27 and the rear bending portion 28 is indicated by the arrows of the alternate long and short dash line for convenience of understanding. In the illustrated example, the tip 24 is provided in a portion of the blade portion 20 that generally constitutes the forward curved portion 27, and as shown in FIG. 4, is convex forward in the rotational direction θ in the axial z view. It has a certain shape. Further, the root end 23 is provided on both the front curved portion 27 and the portion constituting the rear curved portion 28, and as shown in FIG. 4, has an S-shape in the axial z-view. The range in which the front curved portion 27 and the rear curved portion 28 are provided, the degree of curvature of each, and the like are not particularly limited.

Further, in the present embodiment, the blade portion 20 is tilted so as to be positioned forward in the rotation direction θ so as to be separated from the base portion 1 in the axial direction z. Further, in the present embodiment, the inclination angle of the blade portion 20 with respect to the axial direction z becomes larger toward the inner side of the radial direction r. More specifically, as shown in FIG. 3, the angle α1 which is the angle formed by the inner end 21 of the blade portion 20 with the axial direction z is the angle formed by the outer end 22 of the blade portion 20 with the axial direction z. be. It is larger than the angle α2. In other words, the angle formed by the front bending portion 27 in the axial direction z is larger than the angle formed by the rear bending portion 28 in the axial direction z.

When the stirring blade A2 rotates in the rotation direction θ, the stirring target also generates a rotational flow along the rotation direction θ. Further, a flow in which the stirring object T is sucked into the stirring blade A2 is generated from above the axial direction z of the stirring blade A2. Then, a flow is generated from the lower end of the stirring blade A2 in the axial direction (near the outer peripheral end 10) toward the outer side in the radial direction along the bottom of the container 81.

As a factor of the sophistication of mixing by the stirring blade A2, first, the contribution of the forward curved portion 27 of the blade portion 20 can be mentioned. According to the research by the inventors, by making the front curved portion 27 convex in the rotation direction θ forward, the agitated object T is sucked more strongly at the inner end 21 and the agitated object T is sucked in diameter. It was found that it is possible to move the direction r outward more smoothly. In particular, in the illustrated example, it is advantageous that the angle formed by the blade portion 20 at the inner end 21 and the rotation direction θ is relatively small in order to suck the agitated object more strongly. It turned out to be. Further, in the illustrated forward curved portion 27, the angle formed by the blade portion 20 and the rotation direction θ gradually increases toward the outside of the radial direction r, so that the sucked stirring object T is radially increased. It turned out to be advantageous for moving it outwards more smoothly. This strong suction and smooth movement are considered to be one of the factors that cause the mixing of the entire agitated object T. The details of the function of the stirring blade A2 can be grasped based on the description of the prior application PCT / JP2017 / 019543 according to the inventor of the present application.

In addition to the above-mentioned form, the stirring blade A2 is made of a single metal plate material developed by the inventor of the present application, and each has a base located at the center in the radial direction and a plurality of blade elements connected to the base. , A plurality of plate materials laminated in the axial direction are provided, and the blade portion has a blade surface having blade elements of a plurality of plate materials adjacent to each other in contact with each other or close to each other to flow a stirring target. Can be used.
It should be noted that the implementation of the stirring device using the stirring blades of the above other forms can be performed based on the matters described in Japanese Patent Application No. 2017-225538 of the prior application according to the inventor of the present application.

Next, the form, function, and the like of the baffle A11 will be described in detail.
The baffle A11 has the form shown in FIGS. 5 to 6.

FIG. 5 is a plan view showing the baffle A11. FIG. 6 is a side view showing the baffle A11.
The material of the baffle A11 is not particularly limited, and a material suitable for dispersing and mixing the agitated object T such as metal or resin is appropriately selected. Preferred metals constituting the baffle A11 include, for example, stainless steel.
As shown in FIG. 5, the baffle A11 is composed of a plurality of fins 101. The fins 101 are formed at equal intervals and radially from the central portion in the radial direction of the central axis in a plan view. Further, each fin 101 is curved so as to warp in the radial direction from the central portion to the central axis. The direction of this bending is set so as to bend in the direction opposite to the axial rotation direction of the stirring blade A2.
Further, as shown in FIG. 6, each fin 101 is curved so as to warp from the central portion toward the central axis in the side view. The shape of this curve is set so that the bottom surface of the baffle A11 follows the shape of the inclined portion A10 in which the bottom surface of the container A1 is inclined like a funnel at the bottom portion on the inner wall side.

In the above example, the baffle A11 having eight fins 101 is shown, but the number of fins 101 is not limited to this, and the number of fins 101 can be increased or decreased as needed. Further, in the above example, the baffle A11 having a U-shaped cross-sectional shape of the fin 101 is shown, but the cross-sectional shape of the fin 101 is not limited to this, and the cross-sectional shape of the fin 101 is a flow component of the stirring object T such as a triangle or a quadrangle. Is not particularly limited as long as it can convert.

The baffle A11 shows an example in which the shape of the fin is curved, but as shown in FIG. 7, a baffle A11 in which the shape of the fin is bent can also be used. In the example shown in FIG. 7, an example of bending at the central portion of the fin is shown, but the present invention is not limited to this, and the bending portion can be changed as needed.
Further, in the example shown in FIG. 7, the number of bending points is one for each fin, but the present invention is not limited to this, and the number of bending points may be increased as necessary. can.

Next, the combination of the stirring blade A2 and the baffle A11 and the like will be described in detail.
The stirring blade A2 and the baffle A11 are combined as shown in FIGS. 8 to 9.

FIG. 8 is a plan view showing a state in which the stirring blade A2 and the baffle A11 are combined. FIG. 9 is a front view showing a state in which the baffle A11 is combined.
As shown in FIG. 8, the baffle A11 is fixed to the surface of the inclined portion A10 of the container A1 so as to have a concentric positional relationship with the rotation axis A5. As the fixing means, screwing, fitting, welding and the like can be adopted, but the fixing means is not limited thereto.
Further, as shown in FIG. 9, the rotating shaft A5 protruding from the bottom of the container A1 toward the inside of the container penetrates the central portion of the baffle A11, and the stirring blade A1 is arranged at the tip of the rotating shaft A5. ing.
The stirring blades A2 and the baffle A11 are arranged at predetermined intervals with respect to the axial direction of the rotating shaft A5, and have a positional relationship in which they do not face each other in the radial direction of the rotating shaft A5. This is because the baffle A11 is set to be located on the extension line in the direction in which the stirring object is discharged from the stirring blade A2.

Under the positional relationship between the stirring blade A2, the baffle A11, and the inclined portion A10 of the container A1 as described above, the stirring blade A2 strongly sucks the stirring blade A1 from above the container A1 and is smoother outward in the radial direction of the stirring blade A2. The flow direction of the stirring object T moving to is changed by the interaction between the baffle A11 and the inclined portion A10 of the container A1. This conversion will be described in detail below.
First, when the baffle A11 is not used, when the peripheral speed of the stirring blade A2 is increased and the processing is performed, the stirring object T flows in the container in the same direction as the rotation direction of the stirring blade 201, and the so-called tornado-shaped air A suction vortex is generated, and a cavity portion in which the stirring object T does not exist is generated in the central portion of the container.

On the other hand, as shown in FIG. 1, when the baffle A11 is used, the flow direction of the stirring object T is opposite to the rotation direction of the stirring blade A10 due to the interaction between the baffle A11 and the inclined portion A10 of the container A1. It is converted into a flow in the direction, which generates an air suction vortex V that swirls in the direction opposite to the rotation direction of the stirring blade A10.
The flow in the direction opposite to the rotation direction of the stirring blade A10 is combined with the flow in the same direction as the rotation direction of the stirring blade A2 generated in the vicinity of the stirring blade A2 and in the vicinity directly above the stirring blade A2. Therefore, the air suction vortex swirling in the direction opposite to the rotation direction of the stirring blade A2 disappears in the vicinity immediately above the stirring blade A2 and does not reach the first discharge port A6 at the bottom of the container A1.
As a result, the air suction vortex V reaches the first discharge port A6 at the bottom of the container A1, the shearing force of the high-pressure pump impeller A4 is reduced, and the actions of dispersion, emulsification, dissolution, and atomization are reduced. Can be avoided.

On the other hand, due to the action of the stirring blade A2, the object T to be processed is strongly sucked from above the container toward the stirring blade A2, and smoothly moves and discharged outward in the radial direction of the stirring blade A2, thereby improving the mixing. The original effect of the stirring blade A2 that can be achieved is maintained by the flow in the direction opposite to the rotation direction of the stirring blade A2 generated by the above conversion.
As described above, it is possible to solve both the conflicting problems such as the sophistication of mixing and the prevention of deterioration of the actions of dispersion, emulsification, dissolution and atomization.

The stirring device according to the present invention is not limited to the above-described embodiment. The specific configuration of each part of the stirring device according to the present invention can be freely changed in design.

A1: Container A2: Stirring blade A3: Containment chamber A4: High-pressure pump impeller A5: Rotating shaft A6: First discharge port A7: Second discharge port A8: Piping A9: Discharge port A10: Inclined part A11: Baffle (obstacle plate)
1: Base 2: Blade group 10: Outer peripheral end 11: Inclined surface 20: Blade part 21: Inner end 22: Outer end 23: Root end 24: Tip 25: Front surface 26: Rear surface 27: Front curved portion 28 : Rear curved part r: Radial direction z: Axial direction θ: Rotation direction α1, α2: Angle 101: Fin 201: Stirring blade 202: High-pressure pump impeller 203: Rotation shaft 204: Discharge port 205: Piping 206: Air suction vortex

Claims (8)

A stirring device equipped with a stirring blade and a baffle inside the container.
The stirring blade includes a base portion and a blade group composed of a plurality of blade portions located on one side in the axial direction and arranged in the rotational direction with respect to the base portion.
The blade portion has a forward curved portion that is connected to an inner end in the radial direction and is convex forward in the rotational direction in the axial direction.
The container has an inclined bottom in which the bottom of the inner wall of the container is inclined like a funnel.
The baffle is arranged on the inclined bottom of the container so that the plurality of fins radiate outward from the center of the baffle and are curved or bent in a direction opposite to the rotation direction of the stirring blade. ,
The stirring blade and the baffle are arranged so as not to face each other in the axial rotation direction of the stirring blade and to have a concentric positional relationship.
The baffle is arranged on an extension line in the discharge direction of the stirring object of the stirring blade.
The direction in which the agitated object is discharged from the baffle is the direction from the center of the baffle to the outside.
A stirring device characterized by that. An external circulation means having a stirring target discharge port at the bottom of the container and a stirring target discharge port at the top of the container, and circulating the stirring target via a pipe connecting the discharge port to the discharge port. The stirring device according to claim 1, wherein the stirring device has. The stirring device according to claim 2, wherein the external circulation means has a means for transferring an object to be agitated from a discharge port to a discharge port. The stirring device according to claim 3, wherein the transfer means is a high-pressure pump impeller. The stirring device according to claim 2 to 4, wherein a shower nozzle is arranged at the discharge port. According to claim 1, the blade portion has a rear curved portion that is connected to the front curved portion outward in the radial direction and is convex rearward in the rotational direction in the axial direction. 5. The stirring device according to 5. The stirring device according to claim 1 to 6, wherein the blade portion is tilted so as to be positioned forward in the rotational direction so as to be separated from the base portion in the axial direction. The stirring device according to claim 1, wherein the inclination angle of the blade portion with respect to the axial direction is larger toward the inward direction in the radial direction.

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