JP2015066503A - Agitating device and agitating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agitating device and an agitating method capable of sufficiently performing both of an operation for floating particles precipitated at the bottom of a storage tank and an operation for precipitating the floating particles existing in the vicinity of a liquid level of liquid in the storage tank with a simple configuration and uniformly agitating liquid by suppressing generation of a solid rotary part.SOLUTION: An agitating device 20 includes: an agitating blade 28 rotating with a rotary shaft 22 as a center; and a pair of guide sections 24 and 26 provided on each of an upper side and a lower side of the agitating blade 28 in the longitudinal direction of the rotary shaft 22. Each of the pair of guide sections 24 and 26 has each opening 24a and 26a to suck fluid into a region between the guide sections 24 and 26. Fluid is discharged from the region between the guide sections 24 and 26 to the sides.

Description

  The present invention relates to a stirring device and a stirring method for stirring a liquid such as ink in a storage tank.

  In manufacturing a coated product, in order to improve optical characteristics, design properties, strength, and the like, ink containing fine particles may be applied to a substrate. However, when such an ink is applied to a substrate, there is a problem that the dispersion of particles in the ink gradually becomes non-uniform. The cause of such a problem is that the ink particles are unevenly distributed in the storage tank due to the particles in the ink settling or floating in the ink supply apparatus, particularly in the storage tank storing the ink. It is done. For this reason, at the production site of the coating product, the particles in the ink are dispersed as uniformly as possible by installing a stirring device in the ink storage tank.

  Various types of stirring blades of the stirring device installed in the ink storage tank have been known in the past. For example, a combination of an existing paddle blade and a propeller blade may be used as the stirring blade of the stirring device. However, in such a case, there is a problem that a plurality of types of stirring blades are required. When combining existing paddle blades and propeller blades, it is common to place a paddle blade at the bottom of the storage tank and a propeller blade at the top of the storage tank. The particles that have settled at the bottom of the tank can float, but in order to settle the floating particles near the ink level in the storage tank, it is necessary to increase the rotation speed of the propeller blade. There is a problem that air entrainment tends to occur.

  Here, FIG. 10 shows a state in which air is entrained in the stirring blade by increasing the rotation speed of the stirring blade of the stirring device. As shown in FIG. 10, when the rotation speed of the stirring blade of the stirring device 84 is increased, the rotation of the stirring blade causes air bubbles 86 to be caught in the stirring blade from the liquid level of the ink 82 in the ink storage tank 80. Therefore, there arises a problem that the ink 82 in the ink storage tank 80 cannot be sufficiently stirred.

  Further, in Patent Document 1, a liquid suction port is provided at the bottom of the stirring rotator, and a liquid discharge port is provided at a side of the stirring rotator so that the suction port and the discharge port are communicated with each other through a flow passage. Thus, there is disclosed a stirring device that sucks up particles discharged to the bottom of the storage tank by the suction port and discharges them to the side when rotating the rotating body for stirring. However, such a stirring device has a problem that the floating particles in the vicinity of the ink surface in the storage tank cannot be sufficiently settled.

  Patent Document 2 discloses a stirring device in which a mixing rotating body attached to a rotating shaft is disposed in a liquid in a stirring tank. In such a stirrer, the mixing rotator is formed as a pair of upper and lower disks, and forms an inflow port in the center of the lower disk, and also has a cylindrical shape that opens forward on the front surfaces facing each other. A large number of small chambers are arranged, and the small chambers are arranged at different positions so as to communicate with other small chambers facing each other. However, such a stirring device has a problem that the internal structure is complicated and it is not suitable for dispersion of ink particles. In addition, when two mixing rotators are provided as shown in FIGS. 12 to 14 of Patent Document 2, the ink in the upper mixing rotator and the ink in the lower mixing rotator are less likely to come into contact with each other. Therefore, there is a problem that the operation of floating the particles that have settled at the bottom of the storage tank and the operation of setting the floating particles near the ink surface in the storage tank are not performed sufficiently.

Patent No. 4418019 JP 11-114396 A

  As described above, the conventional stirring device cannot sufficiently perform both the operation of floating the particles settled at the bottom of the storage tank and the operation of setting the floating particles near the ink surface in the storage tank. There was a problem. Further, when the rotation speed of the stirring blade is increased in order to settle the floating particles near the liquid surface of the ink in the storage tank, there is a problem that air is likely to be caught in the stirring blade as described above. is there.

  In addition, in the conventional stirring device, when the liquid in the storage tank is stirred by the stirring blade, a donut-shaped vortex may often be formed above the stirring blade. In this case, for example, the liquid filled in the storage tank When another liquid or solid is added and agitated, the added liquid or solid is trapped in a donut-shaped vortex and turns into a high-concentration lump that turns around the top of the agitating blade, resulting in a uniform concentration There is a problem that it takes considerable time to become. In this way, the part where the liquid in the storage tank just moves with the rotation of the stirring blade is called `` solid rotating part '', and such a solid rotating part has occurred Has a problem that the liquid in the storage tank cannot be uniformly stirred. It can be said that such a solid rotating part is likely to occur when liquid convection hardly occurs around the rotating shaft of the stirring blade.

  The present invention has been made in consideration of the above points, and has a simple configuration to float particles that have settled at the bottom of the storage tank and to settle floating particles near the liquid surface of the liquid in the storage tank. It is an object of the present invention to provide an agitation device and an agitation method that can sufficiently perform both of the operations to be performed, and can uniformly agitate the liquid by suppressing the generation of a solid rotating part.

  The stirring device of the present invention is a stirring device that is provided in a liquid storage tank and stirs the liquid in the storage tank, and includes a rotation shaft, a stirring blade that rotates around the rotation shaft, and the rotation shaft. A pair of guide portions respectively provided on the upper side and the lower side of the stirring blade in the longitudinal direction, and each of the pair of guide portions has an opening for sucking fluid into a region between the guide portions. It is provided, and fluid is discharged from the region between the guide parts to the side.

  According to such a stirring device, the guide portions are provided on the upper side and the lower side of the stirring blade in the longitudinal direction of the rotating shaft, respectively, and fluid is sucked into the region between the guide portions in each of the pair of guide portions. By providing an opening and discharging fluid from the area between the guides to the side, the particles that have settled at the bottom of the storage tank with a simple configuration and the floating particles near the liquid surface of the liquid in the storage tank It is possible to sufficiently perform both of the operations of causing the liquid to settle, and the liquid can be uniformly stirred by suppressing the generation of the solid rotating part.

  In the stirring device of the present invention, the opening may be provided in the vicinity of the rotation shaft in each of the pair of guide portions.

  In the agitation device of the present invention, the pair of guide portions may be made of disc-shaped members arranged so as to be parallel to each other.

  In the stirring device of the present invention, the stirring blade may be attached to at least one of the rotating shaft or the pair of guide portions.

  In this case, the stirring blade may be attached to each of the pair of guide portions.

  The stirring method of the present invention is a stirring method for stirring the liquid in the storage tank, the step of rotating the stirring blade around the rotating shaft, and the upper and lower sides of the stirring blade in the longitudinal direction of the rotating shaft. And a step of sucking fluid into the region between the guide portions by an opening formed in each of the pair of guide portions provided in each of the above, and a step of discharging the fluid laterally from the region between the guide portions. It is characterized by that.

  According to such a stirring method, the fluid is sucked into the region between the guide portions by the openings formed in each of the pair of guide portions, and the fluid is discharged sideways from the region between the guide portions, Both the operation to float particles that have settled to the bottom of the storage tank with a simple configuration and the operation to set the floating particles near the liquid level in the storage tank can be performed sufficiently. By suppressing the generation of the liquid, the liquid can be uniformly stirred.

  According to the stirring device and the stirring method of the present invention, both the operation of floating the particles settled on the bottom of the storage tank and the operation of setting the floating particles near the liquid surface of the storage tank with a simple configuration are sufficiently performed. In addition, the liquid can be uniformly stirred by suppressing the generation of the solid rotating part.

It is a block diagram which shows the outline of a structure of the coating system containing the ink storage tank provided with the stirring apparatus by embodiment of this invention. It is a side view which shows the structure of the ink storage tank provided with the stirring apparatus by embodiment of this invention. It is a perspective view which shows the detail of a structure of the stirring apparatus shown in FIG. FIG. 4 is a top view when the stirring device shown in FIG. 3 is viewed downward from above. It is a longitudinal cross-sectional view of the stirring apparatus shown in FIG. It is a longitudinal cross-sectional view of the stirring apparatus of the other structure by embodiment of this invention. It is a longitudinal cross-sectional view of the stirring apparatus of the further another structure by embodiment of this invention. It is a longitudinal cross-sectional view of the stirring apparatus of the further another structure by embodiment of this invention. It is a top view when the stirring apparatus of another structure by embodiment of this invention is seen downward from upper direction. In prior art, it is explanatory drawing which shows a state when the entrainment of the air to the said stirring blade occurs by enlarging the rotation speed of the stirring blade of a stirring apparatus.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are diagrams showing a stirring device according to the present embodiment, an ink storage tank provided with the stirring device, a coating system including the ink storage tank, and the like. More specifically, FIG. 1 is a configuration diagram illustrating an outline of a configuration of a coating system including an ink storage tank provided with a stirring device according to the present embodiment, and FIG. 2 illustrates a stirring device according to the present embodiment. It is a side view which shows the structure of the provided ink storage tank. 3 is a perspective view showing details of the configuration of the stirring device shown in FIG. 2, FIG. 4 is a top view when the stirring device shown in FIG. 3 is viewed downward from above, and FIG. FIG. 4 is a longitudinal sectional view of the stirring device shown in FIG. 3.

  First, an outline of a configuration of a coating system including an ink storage tank 10 provided with a stirring device 20 according to the present embodiment will be described with reference to FIG. As shown in FIG. 1, the coating system according to the present embodiment has a coating device 50 that coats a substrate with ink 12 containing particles having a minute particle diameter, and the ink used in this coating device 50. 12 is stored in an ink storage tank 10 having a substantially rectangular parallelepiped shape. Further, the coating system according to the present embodiment is provided with an ink supply pump 40, and the ink 12 stored in the ink storage tank 10 is supplied to the coating device 50 by the ink supply pump 40. Yes. Further, the excess ink that has not been applied to the substrate among the ink 12 supplied to the coating device 50 is returned to the ink storage tank 10.

  Next, the configuration of the ink storage tank 10 provided with the stirring device 20 according to the present embodiment will be described with reference to FIG. As shown in FIG. 2, the ink storage tank 10 is provided with a stirring device 20 for stirring the ink 12 stored in the ink storage tank 10. As shown in FIGS. 2 to 5, the stirring device 20 includes a rotating shaft 22 that extends in a substantially vertical direction, and a plurality of (four in the example shown in FIG. 3) stirring blades 28 that rotate about the rotating shaft 22. The upper guide portion 24 and the lower guide portion 26 are provided respectively on the upper side and the lower side of each stirring blade 28 in the longitudinal direction of the rotating shaft 22 (vertical direction in FIG. 2). Here, as shown in FIG. 3 and the like, the upper guide portion 24 and the lower guide portion 26 are each in the shape of a disc disposed so as to be parallel to each other. Each stirring blade 28 is attached to the lower surface of the upper guide portion 24 and the upper surface of the lower guide portion 26.

  As shown in FIGS. 3 and 4, each stirring blade 28 is curved in an arc shape, and when each stirring blade 28 rotates in the direction of the arrow in FIGS. 3 and 4 around the rotation shaft 22. The ink 12 in the region between the upper guide part 24 and the lower guide part 26 is ejected laterally. The number of the stirring blades 28 is not limited to four as shown in FIGS. 3 and 4, and the number of the stirring blades 28 is one, two, three, or five or more. Also good.

  In the present embodiment, each of the upper guide portion 24 and the lower guide portion 26 has openings 24 a and 26 a for sucking the ink 12 into a region between the upper guide portion 24 and the lower guide portion 26. Is provided. Further, as shown in FIG. 2, the ink 12 sucked into the region between the upper guide portion 24 and the lower guide portion 26 through these openings 24a and 26a is ejected laterally from the region. It is like that. Thus, since the openings 24a and 26a are provided in each of the upper guide portion 24 and the lower guide portion 26, the particles settled on the bottom of the ink storage tank 10 as shown by reference numeral 14 in FIG. 2 and the operation of settling the floating particles near the liquid surface of the ink 12 in the ink storage tank 10 as indicated by reference numeral 16 in FIG. 2 can be performed. As shown in FIG. 3, in the upper guide portion 24 and the lower guide portion 26, the openings 24 a and 26 a are provided in the vicinity of the rotation shaft 22 (specifically, around the rotation shaft 22). As a result, when each stirring blade 28 rotates about the rotation shaft 22, the upper guide portion 24 and the lower guide portion 26 are connected to each other through the openings 24 a and 26 a of the upper guide portion 24 and the lower guide portion 26. Since the ink 12 sucked into the area between the inks 12 is sent to the vicinity of the rotating shaft 22 and convection of the ink 12 occurs around the rotating shaft 22, a solid rotating part is formed in the ink storage tank 10. It becomes possible to suppress the occurrence.

  Further, as shown in FIG. 4, the stirring device 20 is mounted for attaching a disc-shaped upper guide portion 24 and a lower guide portion 26 each having an opening 24 a, 26 a in the center thereof to the rotating shaft 22. A member 29 is provided. Instead of the upper guide portion 24 and the lower guide portion 26 being attached to the rotary shaft 22 by the attachment member 29, the root portion of each stirring blade 28 may be directly attached to the rotary shaft 22.

  As shown in FIG. 2, the ink 12 ejected laterally from the region between the upper guide portion 24 and the lower guide portion 26 is formed on the inner wall of the ink storage tank 10. The guide portions 11 are provided so as to flow respectively. By providing such a guide portion 11, convection of the ink 12 in the ink storage tank 10 as shown by the arrow in FIG. 2 can be promoted.

  Next, operation | movement of the stirring apparatus 20 which consists of such a structure is demonstrated. As shown in FIG. 2, when the rotating shaft 22 is rotated counterclockwise in FIG. 4 by a drive motor (not shown) with the ink 12 stored in the ink storage tank 10, the mounting member 29 causes the rotating shaft 22 to move to the rotating shaft 22. The upper guide portion 24 and the lower guide portion 26 that are attached also rotate in the direction of the arrow in FIG. 4, and each stirring blade 28 disposed between the upper guide portion 24 and the lower guide portion 26 is also shown in FIG. 4. Rotate in the direction of the arrow. As a result, as shown by the arrow in FIG. 2, the ink 12 in the region between the upper guide portion 24 and the lower guide portion 26 is ejected laterally. At this time, since the region between the upper guide portion 24 and the lower guide portion 26 has a negative pressure, the openings 24a and 26a provided in the upper guide portion 24 and the lower guide portion 26 are used. The ink 12 is sucked into the region between the upper guide portion 24 and the lower guide portion 26. This causes the particles that have settled to the bottom of the ink storage tank 10 as indicated by reference numeral 14 in FIG. 2 to float and the liquid level of the ink 12 in the ink storage tank 10 as indicated by reference numeral 16 in FIG. Both of the actions of settling floating particles in the vicinity can be performed.

  As described above, according to the stirring device 20 and the stirring method of the present embodiment, the upper guide portion 24 and the lower guide portion 26 are provided on the upper side and the lower side of the stirring blade 28 in the longitudinal direction of the rotating shaft 22, respectively. Each of the upper guide portion 24 and the lower guide portion 26 is provided with openings 24a and 26a for sucking the ink 12 in a region between the guide portions 24 and 26, so that the upper guide portion 24 and the lower guide portion 26 By ejecting the ink 12 from the area between the sides, the ink 12 particles that have settled down to the bottom of the ink storage tank 10 with a simple structure are floated and near the liquid level of the ink 12 in the ink storage tank 10. It is possible to sufficiently perform both of the operations of settling certain floating particles, and to uniformly generate the ink 12 by suppressing the generation of solid rotating parts. It becomes possible to 拌.

  Further, in the stirring device 20 of the present embodiment, as described above, the openings 24 a and 26 a are provided in the vicinity of the rotating shaft 22 in each of the upper guide portion 24 and the lower guide portion 26. As a result, when each stirring blade 28 rotates about the rotation shaft 22, the upper guide portion 24 and the lower guide portion 26 are connected to each other through the openings 24 a and 26 a of the upper guide portion 24 and the lower guide portion 26. Since the ink 12 sucked into the area between the inks 12 is sent to the vicinity of the rotating shaft 22 and convection of the ink 12 occurs around the rotating shaft 22, a solid rotating part is formed in the ink storage tank 10. It becomes possible to suppress the occurrence.

  Moreover, in the stirring apparatus 20 of this Embodiment, as above-mentioned, the upper side guide part 24 and the lower side guide part 26 become a disk-shaped thing arrange | positioned so that it may mutually become parallel. Further, as shown in FIG. 5 and the like, each stirring blade 28 is attached to each of the upper guide portion 24 and the lower guide portion 26.

  In addition, the stirring apparatus by this Embodiment is not limited to an aspect as mentioned above, A various change can be added.

  For example, the size of the area of the opening 24a provided in the upper guide part 24 and the size of the area of the opening 26a provided in the lower guide part 26 are made different, and thereby the upper guide part 24 and the lower guide part 26 are made different. You may make it change the intensity | strength (ease of sucking) of the ink 12 to the area | region between these. Here, if the area of the opening 24a or the opening 26a provided in the upper guide part 24 or the lower guide part 26 is reduced, the flow velocity of the ink 12 passing through the opening 24a or the opening 26a is increased. The ink 12 can be easily sucked into the region between the lower guide portion 26 and the lower guide portion 26. Thus, the opening 24a provided in the upper guide part 24 and the opening 26a provided in the lower guide part 26 depending on the shape of the ink storage tank 10, the type of the ink 12, and the mode of the precipitated particles 14 and the floating particles 16 of the ink 12. The size of the area may be changed.

  Further, in the stirring device according to the present embodiment, each stirring blade 28 is not limited to being attached to each of the upper guide portion 24 and the lower guide portion 26. As another stirring device, each stirring blade 28 may be attached to one of the upper guide portion 24 and the lower guide portion 26. For example, in the stirring device 20 a as shown in FIG. 6, each stirring blade 28 is attached to the lower guide portion 26, and each of these stirring blades 28 is separated from the upper guide portion 24. Such a stirrer 20a also has the same effect as that of the stirrer 20 as shown in FIGS. 2 to 5 (specifically, the particles of the ink 12 that have settled on the bottom of the ink storage tank 10 with a simple configuration are levitated. Both the operation and the operation of settling floating particles in the vicinity of the liquid surface of the ink 12 in the ink storage tank 10 can be sufficiently performed, and the ink 12 can be made uniform by suppressing the occurrence of a solid rotating part. The effect of being able to stir) can be achieved.

  Further, in a further modification of the stirring device according to the present embodiment, the upper guide portion 24 and the lower guide portion 26 are vertically separated from each stirring blade 28, and each of these stirring blades 28 is attached to the rotating shaft 22. You may make it attach directly. For example, in the stirring device 20b as shown in FIG. 7, each stirring blade 28 is attached to the rotary shaft 22, and these stirring blades 28 are separated from the upper guide portion 24 and the lower guide portion 26, respectively. It has become. Such a stirrer 20b can also achieve the same effects as the stirrer 20 as shown in FIGS.

  Further, in the stirring device according to the present embodiment, the upper guide portion 24 and the lower guide portion 26 are not limited to disc-shaped ones arranged so as to be parallel to each other. For example, in the agitation device 20c as shown in FIG. 8, the upper guide portion 24 and the lower guide portion 26 are each tapered (in other words, funnel shape) so as to gradually narrow toward the respective agitating blades 28. Thus, the upper guide portion 24 and the lower guide portion 26 are vertically separated from the respective stirring blades 28. Such a stirrer 20c can achieve the same effects as the stirrer 20 shown in FIGS.

  Further, in the stirring device according to the present embodiment, each stirring blade is not limited to one curved in an arc shape as shown in FIGS. For example, a plurality of plate-like stirring blades 30 extending linearly may be provided between the upper guide portion 24 and the lower guide portion 26 as in the stirring device 20d as shown in FIG.

  Further, the liquid stirred by the stirring device or the stirring method according to the present invention is not limited to the ink 12 used in the coating device 50. As the liquid stirred by the stirring device or the stirring method according to the present invention, various kinds other than the ink 12 can be used.

  Next, examples of the stirring device and the stirring method according to the present invention will be described. In the embodiment of the stirring device and the stirring method according to the present invention, a 180 mm square water tank is used as a storage tank, and water is poured into the water tank to a height of 150 mm, and two kinds of particles having different specific gravity (particles of each particle). The diameter is about 2 mm). Moreover, the stirring apparatus 20 which consists of a structure as shown in FIG. 2 thru | or FIG. 5 was installed in such a storage tank. At this time, each stirring blade 28 was placed at a height of 75 mm from the bottom surface of the water tank, and the rotating shaft 22 was rotated at a rotational speed of 80 rpm, 100 rpm, and 200 rpm by a drive motor. Then, by rotating each stirring blade 28, whether or not the floating particles near the liquid surface of the liquid in the storage tank sufficiently settle, and whether or not the settled particles settled at the bottom of the storage tank sufficiently float The observation was done.

  As Comparative Example 1, a stirrer having three paddle blades is installed in the storage tank instead of the stirrer 20 configured as shown in FIGS. 2 to 5, and the rotation shaft of the stirrer is driven by a drive motor. Was rotated at each rotation speed of 80 rpm, 100 rpm, and 200 rpm. Then, by rotating each paddle blade, whether or not the floating particles near the liquid surface of the water in the storage tank sufficiently settle, and whether or not the settled particles settled at the bottom of the storage tank sufficiently float Was observed.

  As Comparative Example 2, a stirrer having two propeller blades is installed in the storage tank instead of the stirrer 20 configured as shown in FIGS. 2 to 5, and the rotation shaft of the stirrer is driven by a drive motor. Was rotated at each rotation speed of 80 rpm, 100 rpm, and 200 rpm. Then, by rotating each propeller blade, whether or not the floating particles near the liquid surface of the water in the storage tank sufficiently settle, and whether or not the settled particles settled at the bottom of the storage tank sufficiently float Was observed.

  The observation results in the storage tanks in the above Examples and Comparative Examples 1 and 2 are shown in Table 1 below.

  As shown in Table 1 above, when the stirrer 20 having the structure shown in FIGS. 2 to 5 is installed in the storage tank, the operation and the storage tank to float the settled particles that have settled at the bottom of the storage tank It was confirmed that both of the actions of settling the floating particles in the vicinity of the liquid surface of the liquid can be sufficiently performed. On the other hand, when the stirrer according to Comparative Examples 1 and 2 is installed in the storage tank, the operation of causing the settled particles that have settled to the bottom of the storage tank or the floating particles near the liquid surface of the liquid in the storage tank to settle. It has been confirmed that the operation cannot be performed sufficiently. Further, when the rotation speed of the stirring blade is increased to 200 rpm, when the stirring device according to Comparative Example 1 is installed in the storage tank, as shown in FIG. It was confirmed that air was caught in the wing).

DESCRIPTION OF SYMBOLS 10 Ink storage tank 11 Guide part 12 Ink 14 Ink settled particle 16 Ink floating particle 20, 20a, 20b, 20c, 20d Stirring device 22 Rotating shaft 24 Upper guide part 24a Opening 26 Lower guide part 26a Opening 28 Stirring blade 29 Mounting member 30 Stirrer blade 40 Ink supply pump 50 Coating device 80 Ink storage tank 82 Ink 84 Stirrer 86 Air bubble

Claims (6)

A stirring device that is provided in a liquid storage tank and stirs the liquid in the storage tank,
A rotation axis;
A stirring blade that rotates about the rotation axis;
A pair of guide portions respectively provided on the upper side and the lower side of the stirring blade in the longitudinal direction of the rotating shaft;
With
Each of the pair of guide portions is provided with an opening for sucking fluid into a region between the guide portions, and fluid is discharged sideways from the region between the guide portions. Stirring device.   The stirring device according to claim 1, wherein the opening is provided in the vicinity of the rotation shaft in each of the pair of guide portions.   The stirrer according to claim 1 or 2, wherein the pair of guide portions are each formed of a disk shape arranged so as to be parallel to each other.   The stirring device according to any one of claims 1 to 3, wherein the stirring blade is attached to at least one of the rotating shaft or the pair of guide portions.   The stirring device according to claim 4, wherein the stirring blade is attached to each of the pair of guide portions. A stirring method for stirring the liquid in the storage tank,
A step of rotating the stirring blade around the rotation axis;
Sucking fluid into the region between the guide portions by openings formed in each of a pair of guide portions respectively provided on the upper side and the lower side of the stirring blade in the longitudinal direction of the rotating shaft;
Discharging the fluid laterally from the region between the guide parts;
A stirring method comprising:

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