JP3072467B2 - High-speed stirring method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirring method and a stirring apparatus for dispersing and emulsifying a treatment liquid by using a liquid and a liquid or a mixture of a liquid and a powder as a treatment liquid.

[0002]

2. Description of the Related Art A conventional stirring device is provided with a stirring tool, that is, a blade rotating at a central portion thereof in a stirring container, and the processing liquid is stirred by the blade to make the processing liquid fine. FIG.
(A) and (b) show examples of the prior art. Among them, FIG. 10 (a) shows a case in which a small diameter blade c is provided on a shaft b extending into a container a, and the processing liquid d is supplied by rotating the shaft b. The processing liquid d is agitated by shearing and dispersing the processing liquid d by the blades c and causing the outward circulation of the arrow e to rise and fall. The container a is used to prevent the processing liquid d from running idle. Is provided with a rib-shaped stator f on the inner surface of the. In this apparatus, the diameter D ₁ of the blade c is considerably smaller than the inner diameter D of the vessel a, and is generally one fifth or less of D. Figure a ₁ is a jacket for circulating a heat medium for heating or cooling.

[0003] In FIG. 10 (b), the inclined shaped blade c ₁ is used as a blade, a stator f surrounding the vane c ₁ is held by the fixture g. This device is known as Japanese Patent Publication 6-7913.
The shaft b is rotated at a high speed and the blade b
Is driven at a peripheral speed of about 15 m / sec to actively generate cavitation on the back surface of the blade b in addition to the shearing action to promote atomization.
Circulates as indicated by an arrow e _1.

[0004] Such a conventional technique has the following drawbacks.

[0005] Treatment liquid d subjected to the action of the blades c and c ₁
Is limited to those near the blades c and c ₁ , and the circulation of the arrows e and e ₁ equalizes the action of the blades c and c _1. It is necessary to increase the processing time.

When the processing liquid d rotates together with the blades, the stirring action is reduced, so that it is necessary to provide the stators f and f ₁ as shown in FIGS.

When the blades c and c ₁ are rotated at a high speed in order to give high energy to the processing liquid d, a slip phenomenon accompanied by cavitation occurs when a certain number of rotations is reached, especially when the high viscosity processing liquid is stirred. In addition, the stirring effect is extremely reduced by the slip phenomenon.

In many cases, a heating medium is circulated in the jacket a ₁ during operation, and the processing liquid is often stirred, filled, or discharged while heating or cooling. However, since the overall circulation speed of the processed material is low, It becomes temperature distribution nonuniformity of, it is difficult to stir at uniform temperature by the blade c, c _1.

In order to improve this condition, a device which generates an overall flow by adding an auxiliary device such as an agitator or a scraper has been used, but not only the mechanism becomes complicated, but sufficient results are hardly obtained.

It is difficult to solve high-order agitation for fineness, dispersion, and emulsification depending on the shape of the blades and the addition of the above-mentioned auxiliary equipment. Instead, the amount of adhesion to each part increases, and the yield decreases. Further, profitability not able blades c, but to set the position the position since the close too the overall processing solution circulation in the bottom deteriorate the c ₁ to a suitable height, Then to reduce the minimum amount of processing Gets worse. Further, when an agitator, a scraper, or the like is added, the structure becomes complicated, and the cleaning property is reduced.

[0011]

SUMMARY OF THE INVENTION The present invention relates to
It is an object to solve the difficulties of the above.

[0012]

According to a first aspect of the present invention, there is provided a method for storing a processing solution in a container and rotating a stirring tool in the processing solution. In the stirring method of stirring, a stirrer having an end reaching near the inner peripheral surface of the container is rotated at a high speed in the processing liquid, and the processing liquid is centrifugally moved by the rotation of the processing liquid accompanying the rotation of the stirrer. It is characterized in that stirring is performed at the end of the stirrer while being pressed against the inner surface and rotating in the form of a hollow thin film.

According to this means, the processing liquid is rotated at high speed by receiving the energy of the stirrer, is pressed against the inner surface of the container by centrifugal force and rotates as a hollow thin film. Slower than the rotation speed of the tool. For this reason, the processing liquid on the rotating surface of the stirrer is always subjected to the stirrer by the end of the stirrer, and the stirrer is caused by the rotation of the flow to be fined.

[0014] Further, an apparatus for implementing the above means includes:
As described in claim 2, in a stirring device having a container having a circular cross section and capable of storing a processing liquid, a rotating shaft provided at the center of the container, and a stirring tool attached to the rotating shaft, A stirrer having a radius reaching the vicinity of the peripheral surface; and driving the stirrer at a peripheral speed of 20 m / sec or more at a high speed to store the processing liquid.
A drive source for stirring while rotating in a hollow thin film shape along the inner surface of the container .

According to this means, since the end of the stirrer has reached near the inner surface of the container, a small amount of processing liquid is supplied into the container in comparison with the volume of the container, and the stirrer is rotated at a high speed. If
The processing liquid is formed into a hollow thin film along the inner surface of the container, and is stirred while being rotated by a speed difference from the stirrer.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a high-speed stirring device of the present invention, 2 is a container, 3 is a lid of the container 2, a bearing 4 is fixed to the lid 3, and a drive shaft 5 is supported. The lower end of the shaft 5 blades 6 as mixing tool is fixed, the outer end of the vane 6 and protrusion ₆₁ for improving the stirring action is attached toward the vertical direction, the outside of the blade A slight gap S is provided between the end and the inner surface of the container 2. 7 is secured to the stationary portion of the outer FIG motor, the motor shaft 7 ₁ is connected to the shaft 5.

An inflow pipe 10 for treating liquid from a tank 9 is connected to the bottom 8 of the container 2 via a pump 10 ₁ and a valve 10 _2, and another tank is connected to the valve 10 ₃ . The lid 3 is provided with the additives 13 ₁ , 12 from the additive tanks 11, 12.
14 ₁ Pipe 13, 14 through which extends through, and vacuum pipe 15 which communicates through a valve 15 ₁ to the vacuum source
Penetrates and can be stirred even in a vacuum. The outflow pipe 16 of the processed liquid is connected to the upper side surface of the container 2, and the lower discharge pipe 17 is connected to the lower side surface. 1
6 ₁ and 17 ₁ are valves. The outflow pipe 16 is used for outflow of the processing liquid during continuous processing, and the lower discharge pipe 17 is used for outflow of the processing liquid when performing the badge processing or discharge of the cleaning liquid after cleaning.

The inner surface of the container 2 is cylindrical, but the outlet pipe 1
6, a flange-shaped flow-blocking ring 18 protruding inward of the container 2 is provided. Further, jackets 19 and 20 are provided on the outer surface of the container 2, and a heating medium for heating or cooling is circulated. Reference numeral 21 denotes an apparatus for measuring the particle size of the processing liquid provided in the outflow pipe 16, and the state of miniaturization can be observed.

When the processing liquid L is introduced into the container 2 to the vicinity of the blade 6 and the motor 7 is energized to rotate the blade 6 at a high speed, the processing liquid L is hit by the blade and receives the energy of the blade to rotate. Then, the container 2 is pressed against the inner surface of the container 2 by centrifugal force, the pressure increases, and the container 2 rotates as a hollow thin film. The rotation of the processing liquid L occurs not only in the portion in contact with the blade 6 but also in a portion separated from the blade 6 with the movement of the processing liquid L rotated by the blade 6, and air exists in the container 2. At this time, the rotation is transmitted to the processing liquid L via the rotation of the air and rotated.

The rotation speed of the blade 6 is higher than the rotation speed of the processing liquid, and the gap S between the container 2 and the blade 6 is small.
The processing liquid L existing near the end of the blade is all agitated by the blades 6, and highly fine, dispersing, mixing, emulsifying, and other actions occur. Then, the processing liquid inside and outside the rotating surface of the blade 6 is subjected to a mixing action due to a speed difference during the rotational movement due to the inertia of the processing liquid itself, generation of a vortex, and the like.

This hollow processing liquid L is supplied to the flow blocking ring 1
Stirring is carried out while the rise is restricted by 8, but sufficient stirring is performed in a short time because the tip of the blade 6 always receives a strong stirring action while rising along the inner surface of the container 2. The rotation and the pressure are maintained even after crossing the flow blocking ring 18, and the pressure causes the flow to flow out of the outflow pipe 16.

In this operation, the rising speed of the processing liquid L rising along the inner surface of the container 2 is proportional to the inflow speed from the inflow pipe 10, and the amount of the liquid passing through the flow blocking ring 18 is reduced by the inflow liquid amount. equal. Therefore, the rising speed or the residence time can be adjusted by controlling the inflow speed by the pump 10 ₁ or the valve 10 ₂ , whereby the stirring energy supplied from the blades 6 to the processing liquid L can be adjusted. It can be easily stirred.

FIG. 2 shows the data of the stirring action by the conventional apparatus and the apparatus of the present invention. The vertical axis represents the average particle diameter (μm) of the processing liquid, the horizontal axis represents the processing time (minute), and A mixture of water and paraffin at a ratio of 4: 1 to which 1% or less of a surface lubricant was added was used. In the figure, the A group is based on a conventional device of a different type, the B group and the C group are based on the device of the present invention, but the B group is operated at substantially the same peripheral speed as the A group. Line A ₁ ~
The device shows data C _4, blade shape, the processing solution volume may vary slightly, the inner diameter of the container, A, B, a 156mm in each group and C, the diameter of the blade, A group 38mm It is 152 mm in the B and C groups. Therefore, the gap S between the inner surface of the container 2 and the end of the blade 6 in the groups B and C is 2 mm.

The speed fill in each line A ₁ -C ₄ represents the peripheral velocity of the blade, at a peripheral speed of A ₁ 13.1m / sec, in A ₂ 1
It is 4.9 m / sec. Group B shows data obtained while substantially matching the conventional apparatus and the peripheral speed of the blade with the blade of the same structure as the group C, the peripheral speed of the blades B ₁ of 1
3.35 m / sec, and B ₂ , B ₃ , and B ₄ are 14.7 m / sec. These peripheral velocities are substantially maximum values in the conventional device.

On the other hand, in the apparatus of the present invention, the peripheral speed can be increased arbitrarily to stir the liquid in the form of a hollow thin film. In the C group, C ₁ is 27.45 m / s.
ec, C ₂ is 28.6m / sec, the C ₃ 37.9m / sec, C
₄ is 42.6 m / sec. The mixing state of the starting of the A ₁ -C ₄ are identical.

In detail, the degree of atomization of the paraffin particles and the required time are described in detail in Group A.
It takes 15 minutes to reach 5 μm, and 7-1 for group B
It takes 6 minutes to reach 2 μm and 15 minutes to reach 5 μm.

On the other hand, in the C group, C ₁ is 3 minutes, C ₂ is 1.7 minutes, C ₃ is 0.5 minutes, and C ₄ is 0.2 minutes in 3 μm. 5 μm. C ₃ is 1.
2 minutes to the 7μm, to C ₄ is to 1.5μm 1
It only takes a minute.

As described above, in comparison with the group A driven by the conventional apparatus and the group B driven at the same peripheral speed as the group A, the C
The degree and time of atomization of the group are remarkably excellent,
The reason is understood to be the result of stirring the whole of the processing liquid L in the form of a hollow thin film at the outer end portion of the high-speed blade at a high speed. According to experiments, this effect is obtained when the peripheral speed of the blade is about 20 m / sec. The effect is remarkable at 30 m / sec or more. During this stirring, the processing liquid L is in the form of a thin film.
When the heating or cooling from the jackets 19, 20 takes place, the heat transfer is rapid and uniform.

Although the time required for the atomization of the group C is short, the working radius or the peripheral speed of the impeller is larger than that of the groups A and B. Must also be large. In the C group, as is clear from the lines C _{1 to} C ₄ , the particle diameter decreases as the peripheral velocity increases, so that a particle having a desired particle diameter can be obtained by changing the peripheral velocity.

The particle size distribution in the processing liquid changes depending on the gap S between the inner surface of the container 2 and the blade 6. FIG. 4 shows a change in the particle size distribution when the gap S is changed. The middle one is curve b. A larger one has a distribution indicated by a curve C. Therefore, it is possible to obtain an arbitrary particle size and particle size distribution by adjusting the peripheral speed of the blade 6 and the gap S, and it is possible to easily perform a high degree of atomization and uniform particle size processing.

Although the container 2 in the above embodiment has a simple cylindrical shape, a multistage cylinder 22 is formed as shown in FIG. 3, and the position of the blade 6 is adjusted according to a desired particle size distribution or the viscosity of the processing liquid. May be changed.

Further, a large number of projections 23 are provided on the inner surface of the container outside the blades 6 to create resistance in the circumferential and axial flows, thereby increasing the number of times of substantial stirring by the blades. You can also. Even if the inner diameter of the container 2 and the outer diameter of the blades 6 in the group C are larger than the above-mentioned values, the same effect is obtained if the gap S is small.

Although the inner surface of the container 2 is a cylindrical surface, the residence time of the processing liquid can be changed by making the inner surface a tapered surface as shown in FIGS. FIG.
The container 2 is provided with a large-diameter tapered surface 25 at the top, and the container 2 shown in FIG. 6 is provided with a small-diameter tapered surface 26 at the top.

In FIG. 5, the processing liquid flowing from the inflow pipe 10 and being rotated by the blades 6 easily flows to the large diameter side due to centrifugal force, and thus flows rapidly in the direction of arrow 27. Therefore, the residence time in the container 2 is short and the degree of stirring is low. On the other hand, in the container 2 shown in FIG. 6, the blade 6 urges the taper surface 26 to flow toward the large diameter side, but is blocked by the bottom surface. . The reversal of the flow at this time is not limited to one time, and the agitation is extremely high because the agitation is performed by the blade while repeating the inversion.

Instead of the blade 6, the agitator shown in FIGS. 7 and 8 can be used. FIG. 7 shows the gear type blade 30.
Are shown, the vane 30, the disc 30 _2, the ring portion 30 _3, the circulation holes 30 ₅ of several to disk 30 ₂ which is provided a number of teeth 30 ₄ are provided around the boss 30 _1.

The gear-shaped blade 31 has substantially the same structure as the transmission gear, and can be manufactured with extremely high precision and good balance because it is manufactured by a machine tool. There is no possibility of contact with the inner surface or occurrence of vibration. Furthermore, since it is possible to provide a large number of teeth 30 _4, it is possible to have a high stirring property.

FIG. 8 shows a brush-type blade 31.
1 is obtained by fixing the multilayer large number of wires 31 ₂ radially and axially to the boss 31 _1. The blade 31, since the number of wires 31 ₁ per each rotation passes through the treatment liquid, a large shearing and stirring action to the processing solution.

The apparatus shown in FIG. 9 is a multi-stage apparatus for further improving the performance of the apparatus shown in FIGS. The inside of the vessel 2 is divided into three stirring chambers 34 ₁ , 3 ₁ by two partition walls 33.
4 _2, 34 ₃ are partitioned, each stirring chamber is communicated with the central hole 33 _1, 33 ₂ of the partition wall 33. And, the drive shaft 5, the gear type blades 30 of two on each stirring chamber 34 _{1-34 3} is fixed.

The treatment liquid supplied from the inlet pipe 10, enters the stirring chamber 34 _1, stirred by receiving a rotational force from the teeth 30 ₄ of the gear-type blade 30, then as indicate the general consecutive arrows 35 Center hole 33 ₁ , stirring chamber 34 ₂ , center hole 33 ₂ , stirring chamber 3
4 ₃ After being stirred at the gear-type blade 30 while passing through, it is taken out from the outflow pipe 16.

[0040] During this time, the treatment liquid while pressed against the inner surface of the container 2 by centrifugal force struck teeth 30 _4, or mixed thoroughly sheared action and the like.

In each of the above embodiments, the agitator attached to the drive shaft 5 includes the blade 6 and the gear type blade 3.
Either one of the brush blades 31 can be selected and used, and various stirrers having the same effect can be used.

Further, in each of the above-described embodiments, the drive shaft 5 is of the vertical type which is oriented in the vertical direction.

[0043]

As is clear from the above description, according to the first aspect of the present invention, the particle size of the fine particles can be reduced to a fraction of that in the conventional technique, and the processing time can be reduced. Since it can be reduced to one-half or less, an excellent effect which cannot be foreseen from the prior art is produced, and there is an advantage that a high-quality agitated product can be efficiently obtained.

Further, since the processing liquid is held in a thin film on the inner surface of the container, when heating or cooling from the outer surface of the container, there is an advantage that heat transfer is performed quickly and uniformly.

Next, according to the second aspect of the present invention, since no moving parts other than the stirrer and the shaft are used in the container, the operation of the first aspect can be achieved with a very simple structure. In addition, after the work is completed,
Since there is no container other than the container, the stirrer, and the shaft, there is an advantage that the amount discarded in cleaning is small, the yield of the material is good, and the cleaning operation is easy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between stirring time and particle size.

FIG. 3 is a partial view showing another example of the container.

FIG. 4 is a diagram showing a relationship between a gap between a container and a blade and a particle size distribution.

FIG. 5 is a schematic view of an embodiment with a tapered container.

FIG. 6 is a schematic view of another embodiment in which the container is tapered.

FIG. 7 is a front view of a gear type blade.

FIG. 8 is a front view of a brush type blade.

FIG. 9 is a longitudinal sectional view of a multi-stage embodiment.

FIG. 10 is a longitudinal sectional view of a conventional device.

[Explanation of symbols]

 2 Container 3 Lid 5 Shaft 6 Blade L Processing Solution S Gap 30 Gear Type Blade 31 Brush Type Blade 33 Partition

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01F ^7/ 00-7/32 B01F 3/00-3/22

Claims (2)

(57) [Claims] 1. A stirring method for accommodating a processing solution in a container and stirring the processing solution by rotating a stirrer in the processing solution,
A stirrer having an end reaching the vicinity of the inner peripheral surface of the container is rotated at a high speed in the processing liquid, and the processing liquid is pressed against the inner surface of the container by centrifugal force by the rotation of the processing liquid accompanying the rotation of the stirrer and the hollow. A high-speed stirring method, wherein stirring is performed at the end of the stirring tool while rotating in a thin film shape. 2. A stirrer having a container having a circular cross section and capable of storing a processing liquid, a rotating shaft provided at the center of the container, and a stirrer attached to the rotating shaft, wherein a stirrer is provided near an inner peripheral surface of the container. A stirrer having a radius that reaches
High-speed drive at 0m / sec or more, and processing liquid along the inner surface of the container
A high-speed stirrer, comprising: a driving source that stirs while rotating in a hollow thin film shape .