JP6835489B2 - Stirrer - Google Patents

Description

The present invention relates to a device that agitates a liquid, powder, or the like in a tank.

Patent Document 1 discloses a reaction apparatus that efficiently reacts a liquid in a stirring tank using ultrasonic waves. The reactor of Patent Document 1 is an apparatus including a stirring tank, a stirring blade, and an ultrasonic oscillator. The object to be agitated in the stirring tank is agitated by the stirring blade to generate a flow. The small-sized ultrasonic oscillator is installed in the stirring tank in a direction capable of oscillating toward the center of the stirring tank, and oscillates in the direction perpendicular to the flow direction of the object to be agitated by the stirring blade, resulting in ultrasonic waves. To generate. The subdivision action by ultrasonic waves is widely diffused by the flow action by the stirring blade, and the object to be agitated can be agitated efficiently.

Patent Document 2 discloses a suspension manufacturing apparatus having two tanks, a stirring tank and a storage tank, and applying ultrasonic waves from the storage tank to the stirring tank to produce a highly dispersible suspension. .. The ultrasonic medium liquid is stored in the storage tank, and the stirring tank is arranged in the ultrasonic medium liquid. The two ultrasonic oscillator having different frequency characteristics in the storage tank is e Bei. While the contents are being stirred in the stirring tank, two ultrasonic waves having different frequencies are propagated from the two ultrasonic oscillators in the storage tank to the object to be agitated in the stirring tank through the ultrasonic medium solution and the stirring tank. A highly dispersible suspension is produced by stirring with a stirring blade and ultrasonic waves from a storage tank.

Japanese Unexamined Patent Publication No. 2000-20227 Japanese Unexamined Patent Publication No. 2009-178683

In Patent Document 1, since the ultrasonic vibrator is installed in the stirring tank, the flow of the object to be agitated is partially obstructed by the ultrasonic vibrator. The ultrasonic vibrator causes a turbulent flow in the agitated object on the surface facing the flow of the agitated object, and the agitation mixing characteristic becomes good. However, on the surface opposite to the side facing the flow of the agitated material, the agitated material stays and the moving speed becomes significantly low. Therefore, when the object to be agitated is non-reactive, temperature variation and concentration variation are expected to occur, and it takes time to obtain the desired quality. Further, when the agitated substance is a reactive substance, the yield of the main product may decrease.

In Patent Document 2, a certain ultrasonic wave emitted from the ultrasonic vibrator is attenuated in the ultrasonic medium liquid by the time it reaches the stirring tank, and the action of the ultrasonic wave is weakened. At that time, the energy of the ultrasonic waves is converted into heat in the storage tank, which raises the temperature of the ultrasonic medium liquid in the storage tank, which further propagates to raise the temperature of the liquid in the stirring tank. That makes it difficult to control the temperature inside the stirring tank.

An object of the present invention is to provide a technique for improving the effect of stirring and the controllability of temperature in a stirring device using elastic waves such as ultrasonic waves.

In order to solve the above problems, the stirring device of the present invention is a stirring device that stirs an object to be agitated inside the stirring tank, and agitates the outer surface of the stirring tank and makes an elastic wave to the agitated object in the stirring tank. It is characterized by having an oscillator that generates the above-mentioned, and a temperature adjusting device that comes into contact with the outer surface of the stirring tank and adjusts the temperature of the object to be agitated via the stirring tank.

According to the present invention, in a stirring device using ultrasonic waves, it is possible to improve the stirring effect by elastic waves and suppress the temperature change of the object to be stirred.

It is a schematic block diagram of the stirring apparatus by 1st Embodiment. It is a figure for demonstrating a stirring tank. It is a schematic diagram by the upward view of the stirring apparatus according to 1st Embodiment. It is a figure for demonstrating the jacket by 1st Embodiment. It is a schematic block diagram of the stirring apparatus by 2nd Embodiment. It is a schematic diagram by the upward view of the stirring apparatus according to 2nd Embodiment. It is a figure for demonstrating the jacket by 2nd Embodiment. It is a time chart which shows the state of the drive of the piezoelectric element and the rotation of a stirring blade in the stirring device by 2nd Embodiment. It is a time chart which shows the state of driving the piezoelectric element in the stirring apparatus by the modification of 2nd Embodiment. It is a schematic block diagram of the stirring apparatus according to 3rd Embodiment. It is a schematic diagram by the upward view of the stirring apparatus according to 3rd Embodiment. It is a figure for demonstrating the jacket according to 3rd Embodiment. It is a table which shows the decolorization time of Examples 1 and 2 and Comparative Example.

Hereinafter, the stirring container according to the embodiment of the present invention will be described with reference to the drawings. Each embodiment is not individually independent, but can be combined as appropriate, and the synergistic effect of this combination can be grasped. In principle, duplicate explanations between embodiments will be omitted.

<First Embodiment>
FIG. 1 is a schematic configuration diagram of a stirring device according to the first embodiment. FIG. 2 is a diagram for explaining the stirring tank. FIG. 3 is a schematic view of the stirring device according to the first embodiment when viewed from above. FIG. 4 is a diagram for explaining the jacket according to the first embodiment.

Stirring device 1 according to the present embodiment, stirring the liquid and powder, mixing, or a dispersing device, is available to the homogenizing and heat propagation promoting such various applications of the material density distribution.

Referring to FIG. 1, the stirring device 1 includes a stirring tank 2, a stirring blade 3, a stirring shaft 4, a motor 5, a piezoelectric element 6, and a jacket 8.

As shown in FIG. 2, the stirring tank 2 is a container having a body portion 2a and a tank bottom portion 2b, and stores the agitated object b inside. Inside the stirring tank 2, a stirring blade 3 fixed to the stirring shaft 4 is arranged at a position where the stirring object b is immersed. The stirring shaft 4 transmits the power of the motor 5 to the stirring blade 3, so that the stirring blade 3 rotates in the object to be agitated b.

Further, as shown in FIG. 1, a plurality of piezoelectric elements 6 are in contact with the outer wall surface 2d of the body portion 2a and the tank bottom portion 2b of the stirring tank 2. As an example, a plurality of piezoelectric elements 6 are arranged in a vertical row on the body portion 2a forming the outer circumference of the stirring tank 2. The piezoelectric element 6 faces the direction of the stirring shaft 4 at the center of the stirring tank 2. Further, a plurality of piezoelectric elements 6 are arranged over the entire body in Sosoko portion 2b. The piezoelectric element 6 is a vibrator that generates ultrasonic waves or ultrasonic waves by vibrating a piezoelectric body that is a substance having a piezoelectric effect such as piezoelectric ceramics. When ultrasonic waves or sound waves are sent from the piezoelectric element 6 to the object to be agitated b being agitated by the agitating blade 3, the agitation action is improved and uniform agitation can be performed in a short time.

As shown in FIGS. 3 and 4, the spiral jacket 8 is in contact with the periphery of the stirring tank 2. The jacket 8 serves as a flow path 81 of the heat medium c, and adjusts the temperature of the object to be agitated b via the stirring tank 2. The heat medium c flows into the jacket 8 from the lower inlet 82, moves up the flow path 81, and is discharged from the upper outlet 83.

Referring to FIG. 3, as described above, the jacket 8 spirally abuts around the stirring tank 2, but in the portion where the piezoelectric element 6 is arranged, the stirring tank is avoided so as to avoid the piezoelectric element 6. It bulges away from 2 along the outer edge of the piezoelectric element 6.

As described above, in the stirring device 1 according to the present embodiment, the piezoelectric element 6 which is an oscillator abuts on the outer surface of the stirring tank 2 and generates an elastic wave in the agitated object b in the stirring tank 2. The jacket 8 which is a temperature adjusting device comes into contact with the outer surface of the stirring tank 2 and adjusts the temperature of the object to be agitated b via the stirring tank 2. Thus, while generating acoustic waves, such as ultrasonic or sonic onto stirred object b by applying vibration from the outer surface to the bath wall of the agitation tank 2, it is possible to adjust the temperature of the stirred product b through the tank wall Therefore, the stirring effect can be improved by the elastic wave, and the change in the temperature of the object to be agitated b, which changes with the energy of the elastic wave, can be suppressed.

Further, in the present embodiment, in the jacket 8, the flow path 81 through which the heat medium c, which is a medium for adjusting the temperature of the object to be agitated b, flows is spirally arranged on the outer surface of the agitating tank 2. As a result, the temperature of the object to be agitated b can be adjusted with less positional bias by flowing a medium such as a heat medium or a refrigerant through the jacket 8 that spirally covers the agitating tank 2.

Further, in the present embodiment, as shown by an arrow in FIG. 3, the rotation direction of the flow of the heat medium c in the jacket 8 is opposite to the rotation direction of the stirring blade 3. As a result, the heat medium c in the jacket 8 and the object to be agitated b rotate in opposite directions, so that the temperature adjustment by the jacket 8 acts on the object to be agitated b in a wide range, and the temperature can be adjusted with less bias. ..

Further, in the present embodiment, as described above, the flow direction of the heat medium c in the jacket 8 is from the bottom to the top. Thus, since the flow of the heat medium c in the helical jacket 8 the direction from the bottom to the top, be kept full of the heating medium easily jacket 8 regardless of the flow rate even when controlling the flow rate it can.

Further, in the present embodiment, as can be seen from FIG. 1, a piezoelectric element 6 that comes into contact with the outer surface of the tank bottom 2b of the stirring tank 2 is also provided. As a result, elastic waves can be applied to the agitated object b from the bottom 2b of the agitation tank 2, and the agitation effect can be further improved.

Further, in the present embodiment, a plurality of piezoelectric elements 6 having different oscillation frequencies may be arranged on the bottom 2b of the stirring tank 2. By doing so, elastic waves having different frequencies are generated from the bottom 2b of the tank to the agitated object b, so that a plurality of elastic waves can be applied to the agitated object b rotating in the horizontal direction by the stirring blade 3.

The materials of the jacket 8, the stirring blade 3, and the stirring shaft 4 in the present embodiment are not particularly limited, but metal-based materials such as stainless steel, iron, copper, brass, aluminum, and cemented carbide are adopted. To. The material of the stirring tank 2 of the present embodiment is not particularly limited as long as it is not an ultrasonic wave or a resin that easily absorbs sound waves, but for example, stainless steel, iron, copper, brass, aluminum, and cemented carbide. It is composed of metallic materials such as hard.

Further, on the inner surface 2c of the wall of the stirring tank 2 in contact with the object to be stirred b, the stirring blade 3, or the stirring shaft 4, white alumina, gray alumina, alumina-titania, alumina-magnesia, zirconia-are formed on the surface of the metal-based material. Surface by spraying ceramics such as calcia, zirconia-yttria, zirconia-magnesia, chromia-titania, chromia-silica-titania, tungsten, titania, chromia, yttria, zirconia, chrome carbide, magnesia, ceria, tungsten carbide, etc. The processed one may be used. Alternatively, a metal-based material lined with a Teflon material (Teflon is a registered trademark) may be used for the inner wall surface 2c of the stirring tank 2, the stirring blade 3, or the stirring shaft 4.

The portion that transfers heat to the object to be agitated b is not particularly limited to this embodiment. In addition to the jacket structure in which the heat medium c flows inside the flow path as in the present embodiment, a rubber heater, a Peltier element, or the like can also be used. Further, in order to control the temperature of the object to be agitated b, the temperature adjusting device may be provided with a temperature sensor, a control device, or the like in addition to the jacket 8.

Further, in the present embodiment, the flow path 81 of the jacket 8 is spirally arranged along the outer circumference of the stirring tank 2, but the temperature is not limited to this, and the temperature of the object to be agitated b is uniformly adjusted. Any configuration or structure may be used as long as it is possible. For example, the flow path configuration may be such that one flow path branches into a plurality of flow paths extending in the vertical direction, or a cooling coil capable of passing liquid may be arranged in the tank.

Further, as the flow path 81 of the jacket 8 of the present embodiment, as shown in FIG. 3, the heat medium c flows counterclockwise, but the present invention is not limited to this, and the flow path 81 is clockwise. May be good. As can be seen from FIG. 3, the agitated object b in the agitating tank 2 flows clockwise. Therefore, the flow direction of the object to be agitated b in the stirring tank 2 and the flow direction of the heat medium c in the jacket 8 are opposite directions (countercurrent). In the present embodiment, by adopting this countercurrent, the temperature is adjusted by heat exchange from the same direction (parallel flow) between the flow direction of the object to be agitated b in the stirring tank 2 and the flow direction of the heat medium c in the jacket 8. Is increasing the efficiency of.

The material of the heat medium c that passes through the jacket 8 is not particularly limited, but it is preferable that the material does not corrode and deteriorate the wetted portion such as the inner wall of the jacket 8. As an example of the heat medium c, water, hot air, steam, ethylene glycol, propylene glycol, other glycols, silicone oil, salt water and the like may be used alone or mixed. If it is water, it may be hydrogen peroxide (disposable) or circulating water (reused). From the viewpoint of heat transfer, the flow velocity of the heat medium c is preferably 0.3-3.0 m / sec, more preferably 1.0 m / sec or more on the heat transfer surface. Further, the heat medium c may be one type or may be used properly depending on the required conditions and the like. Further, as the temperature adjusting device, it is preferable that the heat medium c can be stably controlled to a desired temperature at the inlet 82 of the jacket 8.

Further, in the present embodiment, the piezoelectric element 6 is used as the oscillator, but various types of piezoelectric elements 6 can be used. For example, both the electrostrictive type and the magnetostrictive type can be used, but the electrostrictive type with less energy loss is preferable.

Further, in the present embodiment, the frequency of the elastic wave applied to the agitated object b is not particularly limited. It is typically an ultrasonic region, but it does not necessarily have to be an ultrasonic region. For example, audible waves can be used, or ultrasonic waves and audible waves can be used together. The frequency is selected according to the purpose, and is preferably 15 kHz or more, more preferably 20 kHz or more and 1,000 kHz or less.

Further, in the present embodiment, the elastic wave generated by the piezoelectric element 6 has a constant wavelength and amplitude, but is not limited to this, and the wavelength and amplitude may be variable respectively.

Further, in the present embodiment, the structure for promoting the flow of the agitated object b in the agitating tank 2 is not particularly provided, but a baffle may be installed on the inner wall surface 2c of the agitating tank 2. In that case, the shape, size, number, installation position, etc. of the baffle can be arbitrarily determined.

<Second Embodiment>
The difference between the stirring device according to the second embodiment and that of the first embodiment will be mainly described.

FIG. 5 is a schematic configuration diagram of the stirring device according to the second embodiment. FIG. 6 is a schematic view of the stirring device according to the second embodiment when viewed from above. FIG. 7 is a diagram for explaining the jacket according to the second embodiment.

A plurality of stirring devices 1A according to the second embodiment shown in FIG. 5 are located at positions facing each other on the outer wall surface 2d of the body portion 2a of the stirring tank 2 as compared with the stirring device 1 according to the first embodiment shown in FIG. The difference is that the piezoelectric element 6A and a plurality of piezoelectric elements 6B are arranged in pairs.

As can be seen from FIGS. 6 and 7, the jacket 8 of the second embodiment spirally abuts around the stirring tank 2, but in the portion where the piezoelectric element 6A or the piezoelectric element 6B is arranged. The piezoelectric element 6A or the piezoelectric element 6B is separated from the stirring tank 2 and swells along the outer edges of the piezoelectric elements 6A and 6B so as to avoid the piezoelectric element 6A or the piezoelectric element 6B.

In the second embodiment, as in the first embodiment, the stirring shaft 4 that rotates during stirring and the stirring shaft 4 that rotates linearly with respect to the stirring shaft 4 are fixed inside the stirring tank 2 and rotate together with the stirring shaft 4. Two planar stirring blades 3a and 3b for stirring the object to be agitated b are arranged. In the second embodiment, unlike the first embodiment, the piezoelectric elements 6A and 6B are paired at symmetrical positions with respect to the stirring shaft 4 and are arranged toward the stirring shaft 4. In this way, since the piezoelectric elements 6A and 6B are arranged on both sides of the stirring shaft 4, the piezoelectric element can be placed on the object to be agitated b at any position regardless of the position of the rotating stirring blade 3. The elastic wave from 6A or the elastic wave from the piezoelectric element 6B arrives without being blocked by the stirring blade 3.

FIG. 8 is a time chart showing the driving of the piezoelectric element and the rotation of the stirring blade in the stirring device according to the second embodiment.
In the graph of FIG. 8, the horizontal axis is time. The vertical axis in the graph of the piezoelectric elements 6A and 6B is the amplitude. The vertical axis in the graph of the stirring blade 3 is the phase.

In FIG. 8, in the graph of the piezoelectric elements 6A and 6B, the portion where the amplitude appears represents the time zone during which the piezoelectric elements 6A and 6B are operating, and the portion where the amplitude does not appear indicates that the piezoelectric elements 6A and 6B are not operating. It is a time zone. The piezoelectric element 6A and the piezoelectric element 6B arranged at positions facing each other across the stirring shaft 4 alternately repeat operation and non-operation in a time division manner. In FIG. 8, the time zone ta1 in which the piezoelectric element 6A is operating and the time zone ta2 in which the piezoelectric element 6A is not operating appear alternately. Similarly, the time period tb2 non-working and the time period tb1 piezoelectric element 6B is running has appeared alternately. Then, the time zone ta2 and the time zone tb1 overlap, and the time zone ta1 and the time zone tb2 overlap. In this way, since the piezoelectric elements 6A and the piezoelectric elements 6B that face each other operate alternately, the piezoelectric elements 6A and the piezoelectric elements 6B do not operate at the same time, and both piezoelectric elements 6A, avoiding interference of elastic waves with each other, The elastic wave generated by 6B can be effectively applied. When interference occurs, the elastic wave from the piezoelectric element 6A and the elastic wave from the piezoelectric element 6B interfere with each other, and there are a part where the effect is strengthened by overlapping and a part where the effect is weakened by canceling each other, and the unevenness becomes large. It ends up. On the other hand, in the present embodiment, interference can be avoided and unevenness can be suppressed to be small by operating the piezoelectric element 6A and the piezoelectric element 6B in a time-division manner.

Further, in the second embodiment, the period in which the stirring blade 3 rotates and the period in which the piezoelectric elements 6A and 6B repeat operation and non-operation are different from each other and are also different from each other by an integral multiple of the other. In FIG. 8, the period T1 in which the piezoelectric elements 6A and 6B repeat operation and non-operation and the period T2 in which the stirring blade 3 rotates are different. Further, the period T2 is neither an integral multiple of the period T1 nor an integral multiple of the period T2. In this way, the period in which the stirring blade 3 rotates the agitated object b and the period in which the piezoelectric elements 6A and 6B repeat operation and non-operation are deviated from each other, so that the action of the elastic wave is a specific portion of the agitated object b. The stirring effect can be equalized without concentrating on.

FIG. 9 is a time chart showing how the piezoelectric element is driven in the stirring device according to the modified example of the second embodiment. In the case of the modified example, the piezoelectric element 6A and the piezoelectric element 6B do not repeatedly operate and deactivate alternately, but the piezoelectric element 6A and the piezoelectric element 6B operate continuously at the same time. However, in the modified example, the oscillation frequencies of the piezoelectric element 6A and the piezoelectric element 6B are different from each other, and are also different from each other by an integral multiple of the other oscillation frequency. The oscillation frequency fa of the piezoelectric element 6A is different from the oscillation frequency fb of the piezoelectric element 6B, the oscillation frequency fa is not an integral multiple of the oscillation frequency fb, and the oscillation frequency fb is not an integral multiple of the oscillation frequency fa. In this way, the combined waves of the elastic waves of the piezoelectric elements 6A and the elastic waves of the piezoelectric elements 6B that face each other in pairs do not become axisymmetric with respect to the stirring axis 4, so that the stirring by the stirring blade 3 is combined with the stirring. The action of elastic waves is not concentrated on a specific part, and the stirring effect can be equalized.

In this embodiment, the number of the piezoelectric elements 6A and the number of the piezoelectric elements 6B are the same, but the present invention is not limited to this. Further, in the present embodiment, an example is shown in which a pair of the piezoelectric elements 6A and the piezoelectric elements 6B are arranged at positions facing each other with the stirring shaft 4 interposed therebetween, but the present invention is not limited to this. A plurality of pairs sandwiching the stirring shaft 4 may be arranged.

<Third Embodiment>
The difference between the stirring device according to the third embodiment and that of the second embodiment will be mainly described.

FIG. 10 is a schematic configuration diagram of the stirring device according to the third embodiment. FIG. 11 is a schematic view of the stirring device according to the third embodiment when viewed from above. FIG. 12 is a diagram for explaining the jacket according to the third embodiment.

As can be seen by comparing FIGS. 10, 11, and 12 with FIGS. 5, 6, and 7, the stirring device 1B according to the third embodiment has a jacket structure similar to that of the stirring device 1 according to the second embodiment. It's different.

As shown in FIGS. 5 and 7, the jacket 8A of the second embodiment is arranged spirally around the body portion 2a of the stirring tank 2 without any space in the vertical direction. On the other hand, in the third embodiment, the jacket 8B has a spiral shape with intervals in the vertical direction. The piezoelectric elements 6A and 6B are arranged so as to come into contact with the outer wall surface 2d of the body portion 2a of the stirring tank 2 at intervals of the jacket 8B. Since the jacket 8 is arranged so as to avoid the piezoelectric elements 6A and 6B in the vertical direction, it is not necessary to avoid the piezoelectric elements 6A and 6B in the radial direction. Therefore, as shown in FIG. 11, the jacket 8B can adopt a circular structure when viewed upward. As a result, a smooth flow of the heat medium c in the jacket 8B can be realized. Further, since the jacket 8B does not need to be separated from the stirring tank 2 at a specific portion as in the second embodiment, uniform temperature adjustment can be realized over the entire circumference of the stirring tank 2.

In the third embodiment, the paired piezoelectric elements 6A and 6B are arranged at line-symmetrical positions about the stirring shaft 4 as in the second embodiment, but the present invention is not limited to this. As a modification of the third embodiment, the piezoelectric elements 6 may be arranged in a spiral shape along the vertical interval of the jacket 8B in the body portion 2a of the stirring tank 2. As a result, a large number of piezoelectric elements 6 can be arranged in the periphery, and elastic waves can be transmitted to the center from various directions.

Further, in the third embodiment, an example is shown in which the jacket 8B forms a spiral shape at even intervals from the inlet 82 to the outlet 83, but the present invention is not limited to this. As another example, the flow paths 81 of the jacket 8 may be spaced apart in the vertical direction only in a specific portion, and the piezoelectric element 6 may be arranged in that portion.

Hereinafter, Examples 1 and 2 and Comparative Examples will be described.

The conditions common to Examples 1 and 2 and Comparative Examples were as follows.

That is, the stirring tank 2 has a cylindrical shape with the bottom of the tank 2b as a flat bottom, the tank diameter D = 200 mm, the plate thickness t = 1.5 mm, and the tank height B = 250 mm (effective height 200 mm). The entire stirring tank 2 was made of SUS316L steel. The baffle was not installed.

The stirring shaft 4 has a diameter of 10 mm. The stirring blade 3 has a blade diameter d = 120 mm, a blade height b = 80 mm, and a plate thickness of 1.5 mm. The shape of the bottom of the stirring blade 3 was matched to the shape of the bottom of the tank. The rotation speed of the stirring blade 3 during stirring was 80 rpm.

As the piezoelectric element 6 attached to the outer wall surface 2d of the body portion 2a of the stirring tank 2, a commercially available Langevin type oscillator (28 kHz, 25 W / piece equivalent) having a diameter of 45 mm was used. Further, as the piezoelectric element 6 attached to the bottom portion 2b of the tank, a commercially available Langevin type oscillator of φ45 mm and 40 kHz, equivalent to 25 W / piece were used in combination.

Further, in the jacket 8, the flow path 81 has a jacket width x = 10 mm and a jacket height y = 50 mm. A mixed solution of water and ethylene glycol was used as the heat medium c, and ethylene glycol was 75 wt. % And the rest was water. The temperature inside the jacket 8 was adjusted to be 20 ° C., and the temperature was adjusted so that the temperature inside the jacket 8 was 20 ° C. The speed at which the heat medium c flows through the flow path 81 was adjusted to 1.0-1.5 m / sec (0.5-0.75 L / sec) on the heat transfer surface.

As the agitated substance b, a total of 4 L of a commercially available starch syrup / iodine solution and sodium thiosulfate was used. A mixture of iodine solution and starch syrup solution was prepared. After passing water through the jacket 8 and operating the motor 5 to stabilize the temperature, a sodium thiosulfate aqueous solution having 1.1 equivalents of sodium thiosulfate was added at once to iodine. The time when the aqueous sodium thiosulfate solution was added was set as the reference time for starting mixing.

Further, the stirring blade 3 was continuously rotated to continuously operate the stirring device 1, and during that time, the time from the reference time until the iodine was visually decolorized (decolorization time) was measured as confirmation of the mixing property.

The individual conditions of Example 1, Example 2, and Comparative Example were as follows.

<Example 1>
In the first embodiment, assuming the first embodiment, the outer wall surface 2d of the body portion 2a of the stirring tank 2 is vertically viewed at one place on the outer periphery of the stirring tank 2 as seen from above. Four were arranged in one row at approximately equal intervals.

<Example 2>
In the second embodiment, assuming the second embodiment, the piezoelectric element is placed on the outer wall surface 2d of the body portion 2a of the stirring tank 2 at a position facing each other with the stirring shaft 4 as the center, as in FIG. Four 6A and four piezoelectric elements 6B were arranged in one row at substantially equal intervals.
Further, in the second embodiment, the initial times in the operation control of the piezoelectric element 6A and the piezoelectric element 6B are matched, the piezoelectric element 6A is operated for exactly 1 second, then is not operated for 1 second, and this is repeated in pulse operation. .. On the other hand, the piezoelectric element 6B was operated for 1 second after being strictly inactive for 1 second, and the pulse operation was repeated. That is, the piezoelectric element 6A and the piezoelectric element 6B were operated so as to alternately repeat operation and non-operation every second.

<Comparison example>
In order to compare with Examples 1 and 2, in Comparative Example, the piezoelectric element 6 was operated without operating in the configuration of Example 1.

The decolorization time of iodine was measured according to Examples 1 and 2 and Comparative Examples. FIG. 13 is a table showing the decolorization time of Examples 1 and 2 and Comparative Example. From Table 1, it can be seen that the decolorization time is shortened in Example 1 and Example 2 as compared with Comparative Example.

1, 1A, 1B ... Stirrer, 2 ... Stirring tank, 2a ... Body, 2b ... Tank bottom, 2c ... Wall inner surface, 2d ... Wall outer surface, 3, 3a, 3b ... Stirring blade, 4 ... Stirring shaft, 5 ... Motor, 6, 6A, 6B, 6C ... Piezoelectric element, 8, 8A, 8B ... Jacket, 81 ... Flow path, 82 ... Inlet, 83 ... Outlet, b ... Agitated object, c ... Heat medium

Claims (7)

In a stirring device that stirs the object to be agitated inside the stirring tank,
The temperature of the agitated object is adjusted via the oscillator that abuts on the outer surface of the agitating tank and generates an elastic wave on the agitated object in the agitating tank and the outer surface of the agitating tank. Has a temperature control device
Inside the stirring tank, a stirring shaft that rotates during stirring and a plurality of stirring blades that are fixed linearly symmetrically with respect to the stirring shaft and rotate together with the stirring shaft to stir the object to be agitated are arranged. ,
The oscillators are paired at symmetrical positions with respect to the stirring shaft and are arranged toward the stirring shaft.
A stirring device characterized in that the oscillators arranged at positions facing each other across the stirring shaft alternately repeat operation and non-operation in a time division manner. The stirring device according to claim 1, wherein the period in which the stirring blade rotates and the period in which the oscillator repeats operation and non-operation are different from each other and are also different from each other by an integral multiple of the other. In a stirring device that stirs the object to be agitated inside the stirring tank,
The temperature of the agitated object is adjusted via the oscillator that abuts on the outer surface of the agitating tank and generates an elastic wave on the agitated object in the agitating tank and the outer surface of the agitating tank. Has a temperature control device
The temperature adjusting device includes a jacket in which a flow path of a medium for adjusting the temperature of the object to be agitated is spirally arranged on the outer surface of the agitating tank.
The jacket has a spiral shape with vertical spacing.
The oscillators are arranged so as to come into contact with the outer surface of the tank wall of the stirring tank at the intervals.
A stirring device characterized in that. In a stirring device that stirs the object to be agitated inside the stirring tank,
The temperature of the agitated object is adjusted via the oscillator that abuts on the outer surface of the agitating tank and generates an elastic wave on the agitated object in the agitating tank and the outer surface of the agitating tank. Has a temperature control device
Inside the stirring tank, a stirring shaft that rotates during stirring and a plurality of stirring blades that are fixed linearly symmetrically with respect to the stirring shaft and rotate together with the stirring shaft to stir the object to be agitated are arranged. ,
The oscillators are paired at symmetrical positions with respect to the stirring shaft and are arranged toward the stirring shaft.
The temperature adjusting device includes a jacket in which a flow path of a medium for adjusting the temperature of the object to be agitated is spirally arranged on the outer surface of the agitating tank.
A stirring device characterized in that the rotation direction of the flow of the medium in the jacket is opposite to the rotation direction of the stirring blade. In a stirring device that stirs the object to be agitated inside the stirring tank,
The temperature of the agitated object is adjusted via the oscillator that abuts on the outer surface of the agitating tank and generates an elastic wave on the agitated object in the agitating tank and the outer surface of the agitating tank. Has a temperature control device
Inside the stirring tank, a stirring shaft that rotates during stirring and a plurality of stirring blades that are fixed linearly symmetrically with respect to the stirring shaft and rotate together with the stirring shaft to stir the object to be agitated are arranged. ,
The temperature adjusting device includes a jacket in which a flow path of a medium for adjusting the temperature of the object to be agitated is spirally arranged on the outer surface of the agitating tank.
The direction of flow of the medium in the jacket up direction der directed from bottom to top,
The rotation direction of the flow of the medium in the jacket is opposite to the rotation direction of the stirring blade.
A stirring device characterized in that. The stirring device according to claim 3 , wherein the oscillators are arranged in a spiral shape along the spacing in the body of the stirring tank. The number of stirring blades is two.
The stirring device according to claim 1 or 4.

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