JP2019147077A - Agitator - Google Patents

Abstract

To provide an agitator which is effective for solving conflicting problems of advancement of mixing and prevention of decrease in action of dispersion, emulsification, dissolution and atomization.SOLUTION: An agitator comprises: an impeller having a forward bend in which a blade part is convexed forward in a rotation direction; a container having an inclined bottom part such that a bottom thereof is inclined in a funnel-like shape; and a baffle which is located on the inclined bottom part, and in which plural fins are so curved or bent in a direction opposite to the rotation direction of the impeller as to be radial outwards from a central part. The impeller and the baffle are not opposite to each other with respect to an axial rotation direction of the impeller, and the baffle is located on an extension line in a discharge direction of an object to be agitated by the impeller.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stirrer for mainly dissolving powder, and relates to a stirrer for efficiently dissolving raw material powder in a liquid used in the manufacture of pharmaceuticals, cosmetics, foods, paints, chemicals, etc. .

The stirrer is widely used in fields including stirring processes such as mixing, dispersion, emulsification, dissolution, and atomization in the manufacturing process of products, particularly in manufacturing fields such as pharmaceuticals, cosmetics, foods, paints, and chemicals. Among these, a powder dissolution tank is mainly used for the stirring treatment involving dissolution of powder and the like. As an agitator for dissolving powder, for example, there is an agitator disclosed in Patent Document 1 (FIG. 10).
When this stirrer processes the liquid in which the powder and the solvent are mixed in a tank provided with the stirrer, the stirrer is connected from the bottom of the tank to the upper part of the container via a dispersing device (pulverizer). A method is used in which powder is dissolved while the upper and lower sides of the stirring target in the tank are constantly switched by circulating the stirring target through the circulation path outside the tank.
According to this method, even in the case of dissolving powder that tends to form lumps (for example, dissolution of PVA powder in water, etc.), the time required for dissolution is reduced and foaming at the completion of dissolution is suppressed, and undissolved matter It will be possible to dissolve without residual.

However, in the stirrer disclosed in Patent Document 1, it is important to concentrate the force of the stirring blades on a very small part of the processing object in order to further enhance the dispersion of the powder in the solvent. .
On the other hand, in order to further improve the mixing in the stirring device, it is important to cause the force of the stirring blade to act on the entire object to be processed accommodated in the container and cause it to flow. As described above, it is required to reconcile dispersion and mixing with one stirring blade to achieve compatible behaviors.
In particular, the higher the viscosity of the object to be processed, the more difficult it is to improve the dispersion and mixing.

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

As a factor of the advancement of mixing by the stirring blade of Patent Document 2, the contribution of the forward curved portion of the blade portion can be mentioned. As a result of verification by the inventors, by making the front curved portion convex forward in the rotation direction, the processing object is strongly sucked at the inner end, and the sucked processing object is moved radially outward. It moves more smoothly and confirms that it contributes to the advancement of mixing.
As a result, the above-mentioned problems can be solved.For example, even when powder having a small specific gravity that floats near the liquid surface of the solvent and is not compatible with the solvent is dissolved, it is efficiently dissolved while sucking the powder to the bottom of the container. Processing can be performed.

Such a stirring blade of Patent Document 2 can be applied to a melting apparatus to constitute a single-shaft composite mixer with a container bottom as shown in FIG. The single-shaft composite mixer with a container bottom is fixed to a rotating shaft 203 in which rotating bodies having different roles of a stirring blade 201 and a high-pressure pump impeller 202 protrude from the container bottom.
Among these, the mixing blade 201 has a function of uniformly mixing the stirring target T in the container, while the high-pressure pump impeller 202 applies shearing force to the stirring target to perform various stirring such as dispersion, emulsification, dissolution, and atomization. Has a function to perform operations.
The high-pressure pump impeller 202 also has a function of a high-pressure pump. The high-pressure pump impeller 202 sucks the stirring target T from the discharge port 204 at the bottom of the container and transfers it to the upper part of the container via the pipe 205 outside the container. It has a function of circulating the stirring object T.
In addition, the single-shaft composite mixer with a container bottom has a stirring blade 201 and a high-pressure pump impeller 202 fixed to one drive unit, so that the device can be manufactured at a lower cost compared to devices configured with separate drive units. There is merit that can be done.

However, when the processing is performed by increasing the peripheral speed of the stirring blade 201 in the single-shaft composite mixer with a container bottom, the stirring target T swirls and flows in the container at a high speed, and a tornado-shaped so-called air suction vortex 206 is generated. In some cases, a hollow portion in which the object to be stirred does not exist is generated in the central portion of the container (FIG. 13).
Furthermore, 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 accommodating chamber of the high-pressure pump impeller 202.
As a result, the shearing force of the high-pressure pump impeller 202 is lowered, and there arises a problem that the action of dispersion, emulsification, dissolution, and atomization on the stirring target T is lowered.

As a means for preventing the air suction vortex 206 from reaching the outlet 204 at the bottom of the container, a method of partially attenuating the flow of the stirring target T can be considered. For example, in the stirring device (mixing device) disclosed in Patent Document 3 (FIG. 14), a baffle (baffle 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 stirring object is attenuated, and mixing of bubbles into the stirring object is suppressed.

JP 2006-205071 A International Publication No. 2017/221935 JP 2007-136432 A

In a single-shaft composite mixer with a container bottom, if a method in which a baffle is brought close to a stirring blade is employed, the problem that an air suction vortex develops and the lower end of the vortex reaches the outlet at the bottom of the container can be solved. However, the original effect of the stirring blade of Patent Document 2 that the stirring target is strongly sucked and moves more smoothly outward in the radial direction and can achieve higher level of mixing is significantly diminished.
For this reason, it has been considered to be inappropriate to employ a method of arranging a baffle in a single-shaft composite mixer with a container bottom.

  As a result of the present inventors diligently examining the above problems, even if the baffle was originally unsuitable in the single-bottom composite mixer with a container bottom, (1) the positional relationship between the stirring blade and the baffle, (2) the shape of the baffle, And (3) by reexamining the arrangement method of the baffle in the container, it has been found that it can be effectively used to solve the conflicting problems of the advancement of mixing and the prevention of lowering the action of dispersion, 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 positioned on one side in the axial direction with respect to the base and the base and rotates. A blade group composed of a plurality of blade portions arranged in the direction, and the blade portion is connected to the inner end in the radial direction and is convex forward in the rotational direction when viewed in the axial direction The container has an inclined bottom portion in which a bottom portion of the inner wall of the container is inclined in a funnel shape, and the baffle is configured such that the plurality of fins are directed outward from a central portion of the baffle on the inclined bottom portion of the container. Are arranged so as to be curved or bent in a direction opposite to the rotation direction of the stirring blade, and the stirring blade and the baffle are not opposed to the axial rotation direction of the stirring blade and are concentric It becomes the positional relationship of Is urchin disposed, said baffle is disposed on an extension of the discharge direction of the stirring object of the stirring blade (claim 1).

The stirrer has an outlet for stirring object at the bottom of the container and an outlet for stirring object at the upper part of the container, and the external of the stirring object is circulated through a pipe connected to the discharge port from the discharge port. It is preferable to have a circulation means (Claim 2).
Moreover, it is preferable that the said external circulation means has a transfer means from the discharge port to a discharge port for the stirring target object (Claim 3).
The transfer means is preferably a high pressure pump impeller.
Furthermore, it is preferable that a shower nozzle is disposed at the discharge port.

On the other hand, it is preferable that the said blade | wing part has the back curve part which is connected to the said radial direction outward with respect to the said front curve part, and is convex in the said rotation direction back in the said axial direction view (Claim 6). ).
More preferably, the blade portion is inclined so as to be positioned forward in the rotational direction as it is separated from the base portion in the axial direction.
More preferably, the inclination angle of the blade portion with respect to the axial direction is larger toward the inner side in the radial direction (Claim 8).

According to the configuration of the present invention, the flow component of the stirring target generated by the stirring blade is converted into the flow component swirling in the direction opposite to the axial rotation direction of the stirring blade, and swirling in the direction opposite to the axial rotation direction of the stirring blade. Air suction vortices can be generated (FIG. 1).

Specifically, as shown in FIG. 1, the flow direction of the stirring object T generated by the stirring blade A2 is 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 a 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 synthesized in the vicinity of the stirring blade A2 and the flow in the same direction as the rotation direction of the stirring blade A2 in the vicinity of the stirring blade A2. For this reason, the air suction vortex V swirling 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, the shearing force of the high-pressure pump impeller A4 can be reduced, and the problem that the action of dispersion, emulsification, dissolution, and atomization can be avoided.
On the other hand, the processing target T is strongly sucked from above the container A1 toward the stirring blade A2 by the action of the stirring blade A2, and is smoothly moved and discharged radially outward of the stirring blade A2. The original effect of the stirring blade A2 that 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 conflicting problems such as advancement of mixing and prevention of lowering of the action of dispersion, emulsification, dissolution, and atomization.

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

It is the schematic 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 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 baffle used for the stirring apparatus which concerns on this invention. It is the schematic which shows the stirring apparatus which concerns on a prior art example. It is the schematic which shows the stirring apparatus which concerns on a prior art example. It is a perspective view which shows the stirring blade used for the stirring apparatus which concerns on a prior art example. It is the schematic which shows the stirring apparatus which concerns on a prior art example. It is the schematic which shows the stirring apparatus which concerns on a prior art example. It is the schematic which shows the stirring blade and baffle used for the stirring apparatus which concerns on a prior art example.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. 1-9 has shown one Embodiment and the modification of the stirring apparatus which concern on this invention.

A stirrer A shown in FIG. 1 is a stirrer mainly for dissolving powder, and efficiently dissolves raw material powder used in the manufacture of pharmaceuticals, cosmetics, foods, paints, chemicals, etc. in a liquid. Is a stirrer.

The stirring device A is a so-called single-shaft composite mixer with a container bottom, in which a stirring blade A2 is disposed in the container A1, and a high-pressure pump impeller A4 is disposed in the storage chamber A3 disposed immediately below the container A1. Has been.
The mixing blade A1 and the high-pressure pump impeller A2 are fixed to a rotating shaft A5 that penetrates the housing chamber A3 and protrudes from the bottom of the container A1 into the container. A shaft seal (not shown) is provided between the storage chamber A3 and the rotation shaft A5, and the rotation shaft A5 is connected to a motor (not shown). The stirring blade A2 and the high pressure pump impeller A4 are structured to rotate integrally in the direction shown in FIG. 1 by the driving force of the motor.
As other components, for example, a casing that supports the container A1 and the motor, a control unit that controls driving of the motor, and the like may be appropriately employed.

The stirring object T put into the container A1 is fluidized and uniformly mixed by the rotation of the stirring blade A2. The mixing blade A2 generates a unique flow with respect to the stirring target, and the form and function will be described in detail later.
Moreover, the 1st discharge port A6 is formed in the center of the bottom part of the container A1, and the container A1 and the storage chamber A3 are connected via the 1st discharge port A6. Thereby, the stirring target T in the container A1 can be transferred to the storage chamber A3 by the suction force of the high-pressure pump impeller A4. The stirring object T transferred and stored in the storage chamber A3 is subjected to various stirring operations such as dispersion, emulsification, dissolution, and atomization by applying a shearing force by the rotation of the high-pressure pump impeller A2.

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

An inclined portion A10 inclined in a funnel shape from the lower end portion of the side wall of the container A1 toward the center of the container is formed at the bottom of the container A1, and a baffle A11 is disposed along the surface of the inclined portion A10. Yes.
The baffle A11 generates a unique flow C with respect to the stirring object T in conjunction with the stirring blade A2 and the inclined portion A10, 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.
The baffle A11 is disposed between the surface of the inclined portion A10 and the stirring blade A2, and does not face the stirring blade A2 with respect to the radial direction of the rotation axis A5.
This is because the baffle A11 is arranged on the extended line in the discharge direction of the stirring object of the stirring blade A2, as will be described in detail later.

Next, the form and function of the stirring blade A2 will be described in detail.
The stirring blade A2 has the form shown in FIGS. 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 viewed 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. Moreover, the arrow in these figures has shown the direction which the stirring blade A1 rotates.

  The material of the stirring blade A2 is not particularly limited, and a material suitable for dispersion and mixing of 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 is exemplified. Further, the stirring blade A2 may be one in which the base 1 and the blade group 2 are integrally formed, or may have a configuration in which a plurality of parts are combined. Furthermore, as a structure for attaching the stirring blade A2 to the rotation shaft A5 of the stirring device B1, various attachment mechanisms such as an engagement mechanism and a fastening mechanism may be employed, or at least a part of the rotation shaft A5 and the stirring blade A2. And may be integrally formed. 2 to 4, the structure for attaching the stirring blade A2 to the rotation shaft A5 is omitted for the sake 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 1 is a part that supports the blade group 2 and is fixed to the rotation axis A5. The shape and size of the base 1 are not particularly limited. The base 1 of the present embodiment has a circular shape when viewed in the axial direction z. 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 in the axial direction z of the base 1 and is circular when viewed in the axial direction z. The inclined surface 11 is provided on the upper side in the axial direction z with respect to the outer peripheral end 10. The inclined surface 11 is inclined so as to be positioned 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 constituted by a side surface of the cone.

  The blade group 2 is composed of a plurality of blade portions 20 that are located on the one side in the axial direction z with respect to the base portion 1 and are arranged in the rotational 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. The four blade portions 20 are arranged at an equal pitch, 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 bending portion 27 and a rear bending portion 28. The inner end 21 is an end portion that is located most inward in the radial direction r in the blade portion 20. 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 an end portion that is located on the outermost side in the radial direction r in the blade portion 20. 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 direction z. In other words, either the base 1 or the blade 20 is not configured to protrude outward in the radial direction r. However, the blade portion 20 may be configured to protrude outward in the radial direction r from the base portion 1 or may be configured to be retracted inward in the radial direction r from the base portion 1.

  The root end 23 is a part where the blade part 20 is connected to the base part 1. The tip 24 is an end portion of the blade portion 20 that is 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 front bending portion 27 is a portion that is connected to the inner end 21 and is convex forward in the rotation direction θ in the axial direction z. More specifically, the front bending portion 27 has a shape that is convex forward in the rotational direction θ with respect to a virtual straight line connecting both ends in the radial direction r of the front bending portion 27. The rear bending portion 28 is a portion that is connected to the outer side in the radial direction r with respect to the front bending portion 27 and is convex rearward in the rotation direction θ in the axial direction z.
More specifically, the rear bending portion 28 has a shape that protrudes rearward in the rotational direction θ with respect to a virtual straight line connecting both ends in the radial direction r of the rear bending portion 28. In FIG. 2 and FIG. 4, the front bending portion 27 and the rear bending portion 28 are indicated by respective dashed lines 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 as viewed in the axial direction z. It has a certain shape. Further, the root end 23 is provided in both of the portions constituting the front bending portion 27 and the rear bending portion 28, and as shown in FIG. 4, has an S shape in the axial direction z. In addition, the range in which the front bending portion 27 and the rear bending portion 28 are provided, the degree of bending of each, and the like are not particularly limited.

Moreover, in this embodiment, the blade | wing part 20 is inclined so that it may be located ahead of the rotation direction (theta), so that it leaves | separates from the base 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 increases as it goes inward in the radial direction r. More specifically, as shown in FIG. 3, the angle α <b> 1 that is the angle formed by the inner end 21 of the blade portion 20 with the axial direction z is the angle that the outer end 22 of the blade portion 20 is formed with the axial direction z. is there. It is larger than the angle α2. In other words, the angle formed by the front curved portion 27 with the axial direction z is larger than the angle formed by the rear curved portion 28 with the axial direction z.

When the stirring blade A2 rotates in the rotation direction θ, the stirring object also generates a rotational flow along the rotation direction θ. Moreover, the flow in which the stirring target T is sucked into the stirring blade A2 is generated from above the axial direction z of the stirring blade A2. And the flow which goes to radial direction r outward along the bottom part of the container 81 arises from the axial direction z lower end (near outer peripheral end 10 vicinity) of the stirring blade A2.

As a factor of the advancement of mixing by the stirring blade A2, first, the contribution of the front curved portion 27 of the blade portion 20 can be cited. According to the study by the inventors, the front bending portion 27 is convex forward in the rotation direction θ, so that the agitated object T is sucked more strongly at the inner end 21 while the agitated object T is sucked. It was found that it was possible to move more smoothly outward in the direction r. In particular, in the illustrated example, the angle formed by the blade portion 20 and the rotation direction θ at the inner end 21 is relatively small, which is advantageous for suctioning the stirring target 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 in the radial direction r, indicating that the agitated stirring object T is in the radial direction. It has been found that it is advantageous to move more smoothly outward. This strong suction and smooth movement is considered to be a cause of mixing of the entire stirring target T. In addition, about the detail of the function of stirring blade A2, it can grasp | ascertain based on the description matter of PCT / JP2017 / 019543 of the prior application which concerns on the inventor of this application.

In addition to the above-described 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 portion located at the center in the radial direction and a plurality of blade elements connected to the base portion. A plurality of plate members stacked in the axial direction, and the blade portion has a blade surface that causes a stirring target to flow in which the blade elements of the plurality of plate members adjacent in the axial direction are in contact with each other or close to each other. Can be used.
In addition, implementation of the stirring apparatus using the stirring blade of said other form can be performed based on the description matter of Japanese Patent Application No. 2017-225538 of the prior application which concerns the inventor of this application.

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

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 dispersion and mixing of the stirring target T such as metal or resin is appropriately selected. An example of a preferable metal constituting the baffle A11 is stainless steel.
As shown in FIG. 5, the baffle A <b> 11 includes a plurality of fins 101. The fins 101 are radially formed at equal intervals in the radial direction of the central axis from the central portion when viewed in a plan direction. 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 curve is set to curve 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 in the direction of the central axis from the central portion when viewed from the side. The shape of this curve is set so that the bottom surface of the baffle A11 follows the shape of the inclined portion A10 inclined like a funnel at the bottom on the inner wall side of the container A1.

In the above example, the baffle A11 having eight fins 101 is shown, but the present invention is not limited to this, and the number of fins 101 can be increased or decreased as necessary. In the above example, the baffle A11 having a U-shaped cross section of the fin 101 is shown. However, the present invention is not limited to this, and the flow component of the stirring target T such as a triangle or a quadrilateral is used as the cross-sectional shape of the fin 101. There is no particular limitation as long as it can be converted.

As the baffle A11, an example in which the shape of the fin is curved is shown. However, as shown in FIG. 7, a fin having a bent shape may be used. In the example illustrated in FIG. 7, an example in which the fin is bent at the center portion is shown. However, the present invention is not limited to this, and the bent portion can be changed as necessary.
Further, in the example shown in FIG. 7, the example in which the number of bent portions is one in each fin is shown, but the present invention is not limited to this, and the number of bent portions may be increased as necessary. it can.

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

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 be in a concentric positional relationship with the rotation axis A5. As the fixing means, screwing, fitting, welding or the like can be adopted, but not limited thereto.
Further, as shown in FIG. 9, a rotating shaft A5 protruding from the bottom of the container A1 into the container passes through the center portion of the baffle A11, and a stirring blade A1 is disposed at the tip of the rotating shaft A5. ing.
The stirring blade A2 and the baffle A11 are arranged at a predetermined interval with respect to the axial direction of the rotation axis A5, and have a positional relationship that does not oppose each other with respect to the radial direction of the rotation axis A5. This is for setting so that the baffle A11 is positioned on the extended line in the direction in which the stirring object is discharged from the stirring blade A2.

Under the positional relationship of the stirring blade A2, the baffle A11, and the inclined portion A10 of the container A1 as described above, the stirring blade A2 is strongly sucked from the upper side of the container A1, and the stirring blade A2 moves more smoothly outward in the radial direction r. The flow direction of the stirring object T that moves to is converted 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 processing is performed with the peripheral speed of the stirring blade A2 increased, the stirring target T flows in the container in the same direction as the rotation direction of the stirring blade 201, so-called tornado-shaped air A suction vortex is generated, and a hollow portion where the stirring target 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. In this way, an air suction vortex V swirling in a direction opposite to the rotation direction of the stirring blade A10 is generated.
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 immediately above the stirring blade A2. For this reason, the air suction vortex swirling in the direction opposite to the rotation direction of the stirring blade A2 disappears near 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 decreases, and the action of dispersion, emulsification, dissolution, and atomization decreases. Can be avoided.

On the other hand, the processing target T is strongly sucked from above the container toward the stirring blade A2 by the action of the stirring blade A2, and is smoothly moved and discharged outward in the radial direction of the stirring blade A2. 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 caused by the conversion.
As described above, it is possible to solve both conflicting problems such as advancement of mixing and prevention of lowering of the action 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 varied in design in various ways.

A1: container A2: stirring blade A3: storage chamber A4: high pressure pump impeller A5: rotating shaft A6: first discharge port A7: second discharge port A8: piping A9: discharge port A10: inclined portion A11: baffle (baffle plate)
1: base 2: blade group 10: outer peripheral edge 11: inclined surface 20: blade 21: inner end 22: outer end 23: root end 24: tip 25: front surface 26: rear surface 27: front curved portion 28 : Back curve part r: Radial direction z: Axial direction θ: Rotational direction α1, α2: Angle 101: Fin 201: Stirring blade 202: High pressure pump impeller 203: Rotating shaft 204: Discharge port 205: Pipe 206: Air suction vortex

Claims (8)

A stirring device comprising a stirring blade and a baffle in a container,
The stirring blade includes a base portion, and a blade group including a plurality of blade portions that are located on one side in the axial direction with respect to the base portion and arranged in the rotation direction,
The blade portion has a front curved portion that is connected to the inner end in the radial direction and is convex forward in the rotational direction when viewed in the axial direction.
The container has an inclined bottom part in which the bottom part of the container inner wall is inclined like a funnel,
The baffle is disposed on the inclined bottom of the container so that the plurality of fins are radially 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 not opposed to the axial rotation direction of the stirring blade, and are arranged so as to be in a concentric positional relationship,
The said baffle is arrange | positioned on the extended line of the discharge direction of the stirring target object of the said stirring blade. The stirring apparatus characterized by the above-mentioned.   External circulation that has a discharge port for the stirring target at the bottom of the container and a discharge port for the stirring target at the top of the container, and circulates the stirring target through a pipe connected to the discharge port from the discharge port The stirring apparatus according to claim 1, further comprising means.   The stirrer according to claim 2, wherein the external circulation means includes means for transferring a stirring object from the discharge port to the 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, wherein a shower nozzle is disposed at the discharge port. The said blade | wing part has the back curve part which is connected to the said radial direction outward with respect to the said front curve part, and is convex to the said rotation direction back in the said axial direction view. 5. The stirring device according to 5.   The stirring device according to any one of claims 1 to 6, wherein the blade portion is inclined so as to be positioned forward of the rotation direction as it is separated from the base portion in the axial direction.   The stirrer according to any one of claims 1 to 7, wherein an inclination angle of the blade portion with respect to the axial direction increases as it goes inward in the radial direction.