JP3028464B2 - Stirrer, stirrer, and stirring method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for efficiently agitating various products such as cosmetics, pharmaceuticals, sanitary goods, foods, chemicals, and the like, or substances used as raw materials thereof, using a stirrer combining a stator and a turbine. About technology.

Conventionally, as a method of stirring a desired object to be processed by using a stirrer in which a stator and a turbine are combined, for example, there is a means as shown in FIG. 8 or FIG.

That is, the means shown in FIG. 8 uses a so-called baffle type stirrer B1. The agitator B1 allows the substance to be treated to flow into the stator 2e from the lower opening 26e of the stator 2e by rotating a turbine 1e having a plurality of screw-shaped inclined blades 12 in the stator 2e. The stator 2e passes through the through hole 24e in the upper part and flows out of the stator 2e. According to such a means, when the substance to be treated passes through the inside of the stator 2e and the inside of the through hole 24e, a shearing action can be generated in the substance to be treated, and atomization by stirring can be achieved. Can be.

On the other hand, the means shown in FIG. 9 uses a so-called slit-type stirrer B2. The stirrer B2 is provided with a plurality of slits 25 on the peripheral wall 28f of the stator 2f that rotatably accommodates the turbine 1e.
f is provided. In such a means, the substance to be treated flows into the stator 2f from the lower opening 26e of the stator 2f by rotating the turbine 1e, and then passes through the slit 25f by centrifugal force due to the rotation of the turbine 1e. be able to. The substance to be treated is in a small turbulent state when passing through the slit 25f in this way, and its surface tension is collapsed, so that atomization is achieved.

[0005]

However, the above two conventional means have advantages and disadvantages in terms of efficiency or performance of the agitation processing of the object to be processed. That is, the applicant of the present application conducted an experiment in which the agitation processing of the object to be processed was performed under the same conditions by the above two means, and the following was found.

First, when a high-viscosity substance is to be treated, the former means of using the baffle-type stirrer B1 can perform a high-viscosity substance of about 100,000 mPa · s. . On the other hand, the latter means using the slit-type stirrer B2 is a turbine 1e.
Since the substance to be processed is passed through the slit 25f of the stator 2f using the centrifugal force of the rotation of the turbine 1e, if the substance to be processed has a high viscosity, the rear side in the rotation direction of each inclined blade 12 of the turbine 1e. As a result, the substance to be treated cannot be smoothly flowed toward the slit 25f due to cavitation or the like. Therefore, the latter means is not suitable for the high-viscosity agitation processing as compared with the former means, and when the substance to be processed is, for example, 20,000 mPa · s or more, the agitation processing is no longer possible. I was

On the other hand, as a specific example of the case where a low-viscosity substance is agitated, the applicant of the present application conducted an experiment on agitation and emulsification of low-viscosity water and liquid paraffin under certain conditions.
In the former method, the reaching average particles are 4.292 μm by the respective stirring treatments for 2 minutes and 20 minutes.
m, 2.767 μm. On the other hand, in the latter method, the reaching average particle is 3.306 μm, 2.316 μm.
μm, and the result was obtained that the latter means had better atomization ability than the former means. Such a result is not limited to the case where the water and the liquid paraffin are subjected to the stirring treatment, but is similarly observed when the other low-viscosity substances are subjected to the stirring treatment.

As described above, after all, the above-mentioned conventional means using the baffle-type stirrer B1 is suitable for stirring high-viscosity substances, but is not suitable for stirring low-viscosity substances. . On the other hand, the above-mentioned conventional means using the slit-type stirrer B2 is suitable for stirring low-viscosity substances, but is not suitable for stirring high-viscosity substances.

Therefore, conventionally, in order to perform an efficient stirring process, the above-mentioned 2 is required depending on the viscosity of the object to be processed.
It is necessary to use two stirrers B1 and B2, which is very inconvenient. Further, it is necessary to prepare two types of stirrers and a stirrer provided with the stirrer, which is economically disadvantageous.

Further, in the actual stirring operation,
The viscosity of the object to be treated is not always constant. For example, the viscosity may initially be low, but may become higher as the stirring process proceeds. However, conventionally, when the viscosity of the object to be treated changes as described above, it is not possible to select an optimal stirring method for the viscosity with only one stirrer. Was occurring.

The present invention has been made under such circumstances, and it is necessary to change the type of the stirrer even if the viscosity of the substance to be treated is high or low. It is an object of the present invention to provide an efficient and appropriate stirring process without causing the stirring.

[0012]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention employs the following technical means.

That is, according to a first aspect of the present invention, there is provided a turbine having a plurality of inclined blades which are inclined with respect to a rotation center axis on an outer peripheral surface, and a space for rotatably accommodating the turbine. A stirrer having a lower opening-shaped stator, and a baffle portion having at least one or more through-holes for communicating a space in the stator with the outside of the stator is provided at an upper portion of the stator; A plurality of slits are provided at a position facing the inclined blades of the turbine in a peripheral side surface portion of the stator so as to communicate a space in the stator with the outside of the stator.

According to a second aspect of the present invention, there is provided a stirrer provided with the stirrer according to the present invention, wherein the stirrer is provided with driving means for driving and rotating a turbine of the stirrer in both forward and reverse directions. It is characterized by having.

According to a third aspect of the present invention, the above-described object to be treated is arranged by disposing the above-described agitator according to the present invention in a desired substance to be treated and rotating a turbine of the agitator within a stator. A stirring method for stirring a substance, wherein when the substance to be treated has a predetermined viscosity or less, the turbine rotates the turbine in a direction in which the substance to be treated flows downward, while the substance to be treated has a predetermined viscosity. When it exceeds, the turbine reversely rotates in a direction in which the turbine flows the material to be treated upward.

According to the present invention, when the substance to be treated has a low viscosity equal to or less than a predetermined viscosity, and the turbine of the stirrer rotates the turbine in a direction to flow the substance to be treated downward, the substance to be treated becomes a stator. And flows into the space of the stator through the through hole of the baffle. The substance to be treated that has flowed into the space of the stator receives centrifugal force from the rotating turbine,
It flows out of the stator through a slit in the peripheral side surface of the stator. The substance to be treated is subjected to shearing by the turbine when passing through the baffle section or flowing into the space inside the stator, and generates turbulent flow when passing through the slit, so that atomization thereof is achieved. . Therefore, in the present invention, when the substance to be treated has a low viscosity,
As with the case of using the conventional slit-type stirrer,
The stirring process for passing the substance to be processed through the slit can be performed, and the stirring efficiency becomes very good. Of course, it is also possible to carry out the atomization treatment of the substance to be treated by using a baffle part or the like, so that the stirring efficiency can be increased rather than when a conventional slit-type stirring tool is used.

Further, according to the present invention, when the substance to be treated has a high viscosity exceeding a predetermined viscosity, the turbine of the stirrer reversely rotates the turbine in a direction for causing the substance to be treated to flow upward. Material flows from the lower opening of the stator into the space of the stator. In this case, due to the high viscosity of the substance to be treated, cavitation or the like is generated on the rear side in the rotation direction of the inclined blades of the turbine, so that the substance to be treated cannot efficiently pass through the slit of the stator. Also, the substance to be treated can be guided to the baffle located above the turbine by the rotating action of the turbine. Therefore, when the substance to be treated has a high viscosity, the stirring treatment for passing the substance to be treated through the baffle portion can be performed as in the case of using the conventional baffle-type stirrer, and the stirring efficiency is very good. Becomes

As described above, after all, the present invention can make use of the respective advantages of the means using the conventional baffle type stirrer and the means using the slit type stirrer. In any case of low viscosity and high viscosity, by using one stirrer,
The special effect that efficient stirring processing can be performed is acquired. As a result, in the present invention, it is economical because it is possible to eliminate the need to prepare two types of stirrers or two types of stirrers according to the viscosity of the substance to be treated, and to improve the work efficiency. Can also. Further, it is possible to easily cope with a substance whose viscosity changes as the stirring process proceeds, which is extremely convenient.

In a preferred embodiment of the present invention, in the agitator according to the present invention, the width of the front and rear surfaces of each inclined blade is set to be smaller on the inner peripheral side surface of each inclined blade of the turbine than on the upper side. A configuration in which a notch portion to be narrowed is provided can be adopted.

According to such a configuration, the width of the front and rear surfaces of each inclined blade of the turbine is narrower at the lower part than at the upper part. Can effectively function as a part for causing the substance to be treated to flow upward or downward during the rotation of. On the other hand, the narrow lower portion of each inclined blade has a smaller effect of flowing the material to be treated upward or downward due to the small area of the front and rear surfaces thereof, but the material to be treated is rotated when the turbine rotates. It can function effectively as a part that flows in the outer circumferential direction of the turbine. Therefore, the narrow lower portion of the inclined blade can efficiently apply a centrifugal force to the substance to be treated, and increase the ratio of the substance to be treated passing through the slit of the stator. As a result, there is obtained an advantage that the efficiency of the atomization treatment of the substance to be treated using the slit of the stator can be further improved.

Further, in the above configuration, as a means for reducing the width of the front and rear surfaces of the lower portion of each inclined blade, a cutout portion is provided on the inner peripheral side surface of each inclined blade, so that the outer peripheral side surface of each inclined blade is provided. It is not necessary to provide a notch or the like, and the outer peripheral side surface of each inclined blade can be formed in a desired form along the inner peripheral surface of the peripheral side surface portion of the stator. That is, the outer peripheral side surface of each inclined blade of the turbine can be in a form in which the material to be treated can be appropriately sheared between the outer peripheral side surface portion and the peripheral side surface portion of the stator. Therefore, there is no inconvenience that the stirring efficiency of the substance to be treated is reduced due to the provision of the notch in each inclined blade.

In another preferred embodiment of the present invention,
A configuration may be such that a lower portion of the stator is provided with a hollow disk-shaped bottom plate portion located below the turbine and facing the lower end tip of each inclined blade of the turbine.

According to such a configuration, the bottom plate is disposed between the tip of the lower end of each inclined blade of the turbine and the substance to be treated existing outside and below the stator. It is possible to make it difficult to generate a large vortex in the material to be treated outside the stator with the rotation of the inclined blade. That is, when the lower end of each inclined blade of the turbine is in direct contact with the substance to be treated outside the stator, when the turbine is rotated at a high speed, it is present below the turbine with the rotation of the turbine. The substance to be treated becomes a large vortex, and as a result, the substance to be treated may not be able to flow into the stator properly. However, according to the above configuration, it is possible to prevent or suppress the generation of such a large eddy current of the substance to be treated. Therefore, even when the substance to be treated has a relatively high viscosity, the rotation of the turbine allows the substance to be treated to flow into the space of the stator from the lower opening of the stator properly, and the stirring can be performed. The advantage is that the processing capacity can be further increased.

In another preferred embodiment of the present invention,
The circumferential side surface portion of the stator may be configured to be formed in a tapered shape that has a larger diameter toward the lower side and has a widening downward.

According to such a configuration, the inner diameter of the lower portion of the stator is increased without increasing the size of the baffle provided on the upper portion of the stator, and the opening of the lower opening of the stator is reduced. The area can be increased. Therefore, it is more advantageous in smoothly flowing the substance to be treated into the stator from the lower opening of the stator.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a sectional view showing an example of a stirrer A to which the present invention is applied. This stirrer A is a turbine 1
And stator 2 in combination, both of which are made of stainless steel or the like and have excellent rust and corrosion resistance.

FIG. 2 is a perspective view of the turbine 1.
FIG. 3 is a bottom view of the turbine 1. In this turbine 1, a cylindrical boss 11 having a larger diameter is formed below a shaft 10 such as a cylinder, and a plurality of (for example, four) bosses 11 are formed on the outer peripheral surface of the boss 11. The inclined blades 12 are formed at equal intervals.

The turbine 1 is driven and rotated about the center line C of the shaft portion 10 as a rotation center axis. Each of the inclined blades 12 is a screw blade inclined at a predetermined lead angle α with respect to the rotation center axis C. Is configured as Therefore, if the turbine 1 is rotated, a desired material to be treated can be caused to flow upward or downward depending on the direction of rotation.

Each of the inclined blades 12 protrudes downward from the lower end surface of the boss portion 11 by an appropriate dimension H, and a notch 13 having a predetermined width L is formed on the inner peripheral side surface of the protruding portion. Are formed. That is, as is well shown in FIG. 3, of the portions of each inclined blade 12 that protrude below the boss portion 11, the notch 13 is formed by cutting the inner peripheral side surface 12 b or the like. The diameter D of each inner peripheral side surface 12b is equal to the outer diameter D of the boss portion 11.
It is formed with a diameter larger than 1. Therefore, as shown in FIG. 2, the front and rear surfaces 12 along the rotation direction of each inclined blade 12 are formed.
The widths of c and 12d are wider at the upper portion connected to the boss portion 11, and are smaller at the lower portion protruding below the boss portion Lb.

The shaft portion 10 of the turbine 1 is appropriately provided with a pin insertion hole 14 and the like. This is for attaching the turbine 1 to the turbine drive shaft 5 of the agitating device S described later so as not to rotate relatively.

FIG. 4 is a perspective view of the stator 2.
The stator 2 is formed by connecting a lower opening-shaped tubular portion 21 to a lower portion of a substantially disc-shaped upper plate portion 20 having a constant thickness. As shown in FIG. 1, a space portion 22 that houses the turbine 1 is formed inside the tubular portion 21.

A bearing bush 23 made of gunmetal is attached to the upper plate portion 20. The turbine 1 is mounted rotatably in both forward and reverse directions with respect to the stator 2 by inserting the shaft portion 10 into the bearing bush 23. Further, the upper plate portion 20 is provided with a baffle portion 24 in which, for example, a total of three through holes 24a are formed so as to surround the bearing bush 23. That is, each through hole 24a of the baffle portion 24 is formed so that the upper part of the space portion 22 of the stator 2 communicates with the outside of the stator 2, and enters into the space portion 22 through each of the through holes 24a. Outflow and inflow of the substance to be treated can be performed.

The cylindrical portion 21 is entirely or partly formed on the lower side in a tapered shape expanding downward, and the inner diameter of the peripheral side surface portion 21a gradually increases toward the lower side. . The outer peripheral side surface 12a of each inclined blade 12 of the turbine 1 arranged in the space portion 22 of the stator 2 forms a gap of, for example, about 0.5 mm between the outer peripheral side surface 12a and the inner peripheral surface of the cylindrical portion 21. Is formed.

A large number of vertically elongated slits 25 having a width of, for example, about 1 mm are provided at predetermined pitch intervals in the peripheral side surface portion 21a of the cylindrical portion 21. These slits 25 are lower than the boss 11 of each inclined blade 12 of the turbine 1, for example, each upper end 25 a is set at substantially the same height as the lower end surface of the boss 11 of the turbine 1. It is provided so as to face the protruding portion.
These many slits 25 also communicate the space 22 in the stator 2 with the outside of the stator 2, and the substance to be treated can flow into the space 22 through these slits 25. It is.

A lower opening 2 is provided below the cylindrical portion 21.
6 is provided with a bottom portion 27 in the shape of a hollow disk that closes a part of the bottom plate 6. The bottom plate 27 is located lower than the turbine 1, and the lower end portion 1 of each of the inclined blades 12 of the turbine 1 is provided.
2e. The opening diameter d of the bottom plate 27 is, for example, the lower end 1 of the turbine 1 shown in FIG.
The dimensions are substantially the same as the inner diameter d1 of 2e. The bottom plate 27 may be formed integrally with the stator 2 or may be separately formed and fitted to the lower portion of the stator 2 or the like.

FIG. 5 is a partially sectional front view showing an example of the stirring device S according to the present invention.

This stirrer S is provided with a stirrer A as described above, a container 3 for accommodating a desired substance m to be treated as a fluid, a support 4, and a stirrer attached to the support 4. Alternatively, it is configured to include a plurality of support rods 50, a turbine drive shaft 5, a motor M, and the like.

The support rod 50 and the turbine drive shaft 5
The stirrer A is attached to the lower end of the. More specifically, the stator 2 of the stirrer A is attached to the lower end of the support rod 50, and is non-rotatably supported. The attachment of the stator 2 is performed using, for example, a hole 29 (see FIG. 1 or FIG. 4) provided in the upper plate 20. On the other hand, the lower end of the turbine drive shaft 5 is connected to the shaft portion 10 of the turbine 1 of the stirrer A, and the turbine 1 rotates in conjunction with the rotation of the turbine drive shaft 5. It is set as follows. The upper end of the turbine drive shaft 5 is connected to a drive shaft (not shown) rotatable in both forward and reverse directions of the motor M. Therefore, the turbine 1 is rotatable in both forward and reverse directions by driving the motor M.

The support table 4 is formed so as to be able to be mounted on the upper part of the container 3, and a pair of downwardly bent abutments whose position can be adjusted in the longitudinal direction (arrow a direction) of the support table 4. Piece 40,
40. The support base 4 can be stably mounted on the container 3 by preventing the drop from the container 3 by bringing the set of contact pieces 40, 40 into contact with the upper inner peripheral surface of the container 3. is there.

Next, an example of a stirring method using the stirring device S will be described.

First, a desired substance m to be treated is accommodated in the container 3, and the setting is made so that the stirrer A is immersed in the substance m to be treated. Next, the motor M is driven to rotate the turbine 1 of the stirrer A. When the substance m to be treated has a low viscosity, the turbine 1 is rotated in the direction of arrow b1 as shown in FIG. That is, each inclined blade 12 of the turbine 1 rotates in a direction in which the target substance m flows downward.

When the turbine 1 is rotated in the above-mentioned direction, the stirrer A
Is sucked into the stator 2 through the through hole 24a of the baffle portion 24 of the stator 2. In this case, the target substance m is the turbine 1
Is subjected to a shearing force. On the other hand, centrifugal force acts on the substance m to be treated in the stator 2 by the high-speed rotation of the turbine 1 having the inclined blades 12 in the space 22 of the stator 2. This centrifugal force acts more strongly than the force of each inclined blade 12 of the turbine 1 causing the substance m in the stator 2 to flow below the lower opening 26.

Therefore, the substance to be treated m flowing into the stator 2 passes through the slit 25 located on the outer peripheral side of the turbine 1 and flows out of the stator 2. The substance m to be treated is in a turbulent state when passing through the slit 25, and is atomized.

Further, as described above, when the substance m to be treated that has flowed into the stator 2 flows out through the slit 25 to the outside, the pressure near the lower opening 26 of the stator 2 decreases. Therefore, the target substance m located below the stirrer A flows into the stator 2 through the lower opening 26 of the stator 2. On the other hand, the substance m to be treated, which has passed through the slit 25, rises or falls in the container 3 thereafter, so that the
It will be flowed into. As a result, in the container 3, a circulating flow of the substance to be treated m as shown by an arrow in FIG. 6 can be generated, and the entire substance to be treated m can be efficiently stirred. As a result, it is possible to appropriately perform agitation of the substance m to be treated and atomization or mixing by the agitation.

According to the circulation flow of the substance to be treated m,
The substance m to be treated near the liquid level can be positively flown into the stator 2 of the stirrer A. Therefore, when the stirring process is performed between substances having different specific gravities, for example, the stirring process is performed between water and liquid paraffin.
That is, for example, when performing a mixing process of water and liquid paraffin, the liquid paraffin having a smaller specific gravity is located above water, but in the stirring process, the liquid paraffin located above is mixed with the stirring tool A. As a result, the water can be positively sucked into the stator 2, and the mixing efficiency with water can be increased.

The function of the turbine 1 for causing the material to be treated m to flow downward is obtained by the upper part of the relatively wide dimension La connected to the boss part 11 of the turbine 1 among the parts of each inclined blade 12. Can be On the other hand, the portion projecting below the boss portion 11 of the turbine 1 is formed to have a narrow dimension Lb, and in this portion, the action of flowing the substance to be treated m downward is reduced. In addition, the effect of applying a centrifugal force to the substance to be treated m can be increased. Therefore, by the high-speed rotation of the turbine 1, it is ensured that the material to be treated m flows out of the stator 2 from the slit 25 while the material to be treated m flows into the stator 2 from the baffle portion 24 of the stator 2. . As a result, the application range of the conventional slit-type stirrer shown in FIG. 9 is, for example, about 20,000 m.
Although the method is limited to low-viscosity substances to be processed at a pressure of Pa · s or less, the above-mentioned method enables appropriate agitation to be performed for substances to be processed having a viscosity of about 40,000 mPa · s.

Next, as the stirring operation of the substance to be treated m progresses, the viscosity of the substance to be treated m may become higher. In addition, in the mixing treatment of water and liquid paraffin, the viscosity may be positively increased by adding a thickener. In such a case,
What is necessary is just to switch the rotation direction of the motor M of the stirrer S and rotate the turbine 1 of the stirrer A in the opposite direction to the above. That is, as shown in FIG.
By rotating the turbine 1 in two directions, switching may be performed so that each inclined blade 12 of the turbine 1 causes the target substance m to flow upward.

In the rotation direction of the turbine 1, the substance m to be treated below the stator 2 passes through the lower opening 26 of the stator 2 and flows into the stator 2. The substance to be treated m flowing into the stator 2 is
A part of the slit 2
5 and flows out of the stator 2. The remainder of the substance to be processed m passes through the baffle part 24 of the stator 2. Therefore, the substance m to be treated is the slit 25
Turbulent flow action when passing through the turbine 1 or the turbine 1 when passing through the space 22 and the baffle section 24 in the stator 2.
Atomization can be achieved by the shearing action of the particles.

The overall flow of the substance to be treated m in the container 3 is as shown by the arrow in FIG. 7, and the entire substance to be treated m can be appropriately circulated and flown. However, in order to smoothly flow down the substance to be treated m rising through the baffle portion 24 of the stirrer A, the commutation plate 7
It is preferable to use The commutation plate 7 may be provided by attaching an appropriate member such as a flat plate to the support rod 50.

In the above-described stirring step, the substance to be treated m
As the viscosity becomes higher, it becomes more difficult to smoothly carry out the stirring process. However, in the stirring tool A,
The lower end tip 12 e of each inclined blade 12 of the turbine 1 does not face the lower opening 26 of the stator 2 and is in a state of being blocked by the bottom plate 27. Therefore, even when the turbine 1 is rotated at a high speed in the high-viscosity material to be treated m, a large vortex of the material to be treated m is less likely to be generated below the stator 2 due to the rotating operation of the turbine 1. Therefore, it is possible to alleviate the difficulty of inflow of the substance to be treated m into the stator 2 due to the eddy current.

Further, as the viscosity of the substance m to be treated becomes higher, the amount of the substance m flowing into the stator 2 that passes through the slit 25 decreases, but the amount that passes through the baffle portion 24 increases accordingly. Can be done. Therefore, in any case, processing such as atomization can be achieved. Further, the opening area of the lower opening 26 of the stator 2 is made smaller than the original opening area by the bottom plate portion 27, but the peripheral side surface 21a of the stator 2 is formed in a tapered shape expanding downward. Therefore, the bottom plate 27
Is provided, the substantial opening area of the lower opening 26 can be made relatively large, so that the substance to be treated m can flow into the lower opening 26 smoothly. It becomes possible. As a result, for example, even if the treatment target substance m has a high viscosity of 100,000 mPa · s or more,
Appropriate stirring processing can be performed.

The present invention is not limited to the contents of the above embodiment. The specific configuration of each part of the stirrer according to the present invention, such as the turbine and the stator, and the specific configuration of each part of the stirrer provided with the stirrer can be variously changed in design. For example, the stirrer may be configured to use another stirring member called a rotary paddle separately from the stirrer according to the present invention. Similarly, the specific contents of each working step of the stirring method according to the present invention can be freely changed in various ways, and the specific types and components of the substance to be treated are of course not limited.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a stirrer to which the present invention is applied.

FIG. 2 is a perspective view showing an example of a turbine constituting the stirring device.

FIG. 3 is a bottom view showing an example of a turbine constituting the stirring device.

FIG. 4 is a perspective view showing an example of a stator constituting the stirrer.

FIG. 5 is a partially sectional front view showing an example of a stirring device to which the present invention is applied.

FIG. 6 is a sectional view of a main part showing one working step of a stirring method to which the present invention is applied.

FIG. 7 is an essential part cross sectional view showing another working step of the stirring method to which the present invention is applied.

FIG. 8 is an explanatory view showing an example of a conventional stirring method.

FIG. 9 is an explanatory view showing another example of a conventional stirring method.

[Explanation of symbols]

 Reference Signs List 1 turbine 2 stator 12 inclined blade 12a outer peripheral side surface (of inclined blade) 12b inner peripheral side surface (of inclined blade) 12c, 12d front and rear surface (of inclined blade) 12e lower end surface (of inclined blade) 13 notch portion 20 upper plate portion Reference Signs List 21 peripheral side surface 22 space 24 baffle 24a through hole 25 slit 26 lower opening 27 bottom plate A stirrer S stirrer M motor m substance to be treated

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01F ^7/ 00-7/32

Claims (6)

(57) [Claims] An agitator having a turbine having a plurality of inclined blades that are inclined with respect to a rotation center axis on an outer peripheral surface thereof, and a lower opening-shaped stator having a space for rotatably accommodating the turbine. In addition, a baffle portion having at least one or more through-holes for communicating a space inside the stator with the outside of the stator is provided at an upper portion of the stator. The stirrer is characterized in that a plurality of slits are provided at positions facing the inclined blades to communicate the space inside the stator to the outside of the stator. 2. The notch according to claim 1, wherein the inner peripheral side surface of each inclined blade of the turbine is provided with a notch portion in which the width of the front and rear surfaces of each inclined blade is smaller on the lower side than on the upper side. The stirrer described. 3. A hollow disk-shaped bottom plate located below the turbine and facing the lower end tip of each inclined blade of the turbine is provided below the stator. Or the stirrer according to 2. 4. The stirrer according to claim 1, wherein the peripheral side surface portion of the stator is formed in a tapered shape that has an inner diameter that becomes larger toward a lower side and expands downward. 5. A stirrer provided with the stirrer according to any one of claims 1 to 4, wherein the stirrer is provided with drive means for driving and rotating a turbine of the stirrer in both forward and reverse directions. Characterized by a stirring device. 6. A stirrer according to claim 1, wherein the stirrer is disposed in a desired substance to be treated, and a turbine of the stirrer is rotated in a stator to stir the substance to be treated. A stirring method to be performed, wherein when the substance to be treated has a viscosity equal to or less than a predetermined viscosity, the turbine rotates the turbine in a direction in which the substance to be treated is caused to flow downward. A stirring method, comprising: rotating the turbine in a direction in which the turbine causes a substance to be treated to flow upward;