JP2019081142A - Agitation mixer - Google Patents

Abstract

To provide an agitation mixer improving the production efficiency of a homogeneous mixture.SOLUTION: An agitation mixer 1 comprises: a spiral agitation plate 5 installed to a reciprocating shank 3; a flat plate-like agitation plate 6 installed to the shank 3 at a location different from the spiral agitation plate 5; a casing 2 surrounding the spiral agitation plate 5 and the flat plate-like agitation plate 6; and a plurality of stationary plates 8 thrusting from the casing 2 toward the shank 3 and arranged to pinch the flat plate-like agitation plate 6. The agitation mixer is characterized in that the flow path for a material to be mixed is formed in the casing so that the material is further agitation-mixed by the flat plate-like agitation plate 6 after agitation-mixing of the material by the spiral agitation plate 5.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a stirring and mixing apparatus, and more particularly to a stirring and mixing apparatus for uniformly stirring and mixing a plurality of types of liquids and powders.

  As described in Patent Documents 1 to 3, the inventor conventionally uses a casing as a stirring and mixing device that can be used when mixing a plurality of types of liquids or powders, or when mixing to promote a polymerization reaction, etc. A stirring and mixing device using a stirring plate that reciprocates within is proposed.

  FIG. 1 is an example of a stirring and mixing apparatus which is also shown in Patent Document 1. The basic configuration of the stirring and mixing apparatus 1 is such that the flat plate-like stirring plate 6 is disposed in the casing 2 and the stirring plate 6 is reciprocated (double arrow X) to make the mixture (liquid or powder) in the casing 2 Mix. In order to cause the agitating plate 6 to reciprocate, the agitating plate 6 is attached to the shaft 3, and the shaft 3 is reciprocated by the driving means 4. The mixture enters the casing from arrow a and is discharged from arrow b in a mixed state.

  In order to obtain a more even mixture, in FIG. 1, a fixing plate 8 extending in the direction of the shaft 3 from the side wall of the casing 2 is disposed between the plurality of stirring plates 6. In other words, the plurality of fixing plates 8 are disposed so as to sandwich the stirring plate 6. When agitating the reciprocating plate in the space surrounded by the side wall and the fixed plate, in order to stir more of the mixture, the outer peripheral end of the stirred plate is brought close to the side wall of the casing, and the inner side of the fixed plate It is necessary to bring the end close to the shaft 3. However, in such a structure, it is difficult to move the mixture sufficiently, so Patent Document 1 proposes that the stirring plate and the fixing plate also receive through holes as shown in FIGS. 2A and 2B. ing. FIG. 2A shows a cross-sectional view taken along line A-A ′ of FIG. 1 and FIG. 2B shows a cross-sectional view taken along line B-B ′ of FIG.

  The arrangement of each of the through holes 60 provided in the stirring plate 6 and the through holes 80 provided in the fixed plate 8 may be arranged so that the two through holes do not coincide with each other, even for more efficient stirring. preferable. As shown in FIGS. 2A and 2B, in the stirring plate, the through holes are mainly disposed in the peripheral portion, and in the fixing plate, the through holes are mainly disposed in the vicinity of the shaft portion. When the through holes are formed in such an arrangement, as shown by the dotted arrows C1 and C2 in FIG. 1, the mixture travels in a serpentine manner, so it receives more agitation and a more uniform mixture is obtained. Be

  However, as shown in FIG. 1, since the dotted arrows C1 and C2 do not intersect each other, there is little opportunity for the mixture moving along the route of each arrow to be mixed with each other, and depending on the route through which the mixture passes It is feared that a uniform mixture can not be obtained, for example, due to different properties of the mixture. In a real stirring and mixing apparatus, some mixing occurs even though the moving routes (C1 and C2) shown in FIG. There is a problem that it is necessary to secure longer and the production efficiency of the mixture is lowered.

  In particular, as shown in FIG. 3A, when the outer diameter D1 of the shaft portion 3 is relatively small, the inner diameter D2 of the inner end of the fixing plate 8 also decreases, and the through hole 80 disposed near the inner end is also The shaft 3 can be surrounded by a small number. In such a case, while passing through the through holes of the plurality of fixing plates, it is also possible for the mixture to wrap around on the opposite side of the shaft. However, as shown in FIG. 3B, when the outer diameter D1 of the shaft portion 3 is increased, it is possible that the mixed substance mixed in a part of the periphery of the shaft portion is wound around the shaft portion on the opposite side. It becomes almost impossible. In FIGS. 3A and 3B, the arrangement of the through holes 80 is partially omitted.

Unexamined-Japanese-Patent No. 9-173812 gazette JP 2012-176349 A Japanese Patent Application Laid-Open No. 10-328547

  The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a stirring and mixing apparatus which improves the production efficiency of a uniform mixture.

In order to achieve the above object, the stirring and mixing apparatus of the present invention has the following technical features.
(1) A spiral stirring plate attached to a shaft for reciprocating movement, a flat stirring plate attached to the shaft at a position different from the spiral stirring plate, and the spiral An agitation plate and a casing surrounding the flat plate-like agitation plate, and a plurality of fixing plates which project from the casing toward the shaft and are disposed so as to sandwich the flat plate-like agitation plate. A flow path of the material to be mixed is formed in the casing so as to be further mixed by the flat stirring plate after being mixed by the spiral stirring plate.

(2) In the stirring and mixing apparatus according to (1), as the spiral stirring plate, a first spiral stirring plate, the first spiral stirring plate, and the flat stirring plate The shaft from the casing at a position between the first spiral stirring plate and the second spiral stirring plate, and having a second spiral stirring plate disposed between the And a mixed material is mixed by the first spiral stirring plate, mixed by the second spiral, and further mixed by the flat stirring plate. Thus, the flow path of the mixture is formed.

(3) In the stirring and mixing apparatus according to the above (1) or (2), the spiral stirring plate has the same maximum width in the direction orthogonal to the axial direction of the shaft portion as that of the flat stirring plate. It is characterized in that it is shorter than the maximum width of the direction.

(4) In the stirring and mixing apparatus according to any one of the above (1) to (3), at least one of the spiral stirring plate or the flat stirring plate is reciprocated by the shaft portion. A plurality of openings through which the mixture can be moved are formed in the axial direction of the shaft portion.

(5) In the stirring and mixing apparatus according to any one of the above (1) to (4), the flow of the mixture around the shaft by movement of the flat stirring plate on the fixed plate. It is characterized in that a flow passage for generating

  According to the present invention, a spiral stirring plate attached to a shaft for reciprocating movement, a flat stirring plate attached to the shaft at a position different from the spiral stirring plate, and A spiral stirring plate, a casing surrounding the flat stirring plate, and a plurality of fixing plates which are projected from the casing toward the shaft and are disposed to sandwich the flat stirring plate; Since the flow path of the mixture is formed in the casing so that the mixture is mixed by the spiral stirring plate and then mixed by the flat stirring plate, the mixture is flatted. Since it becomes possible to carry out preliminary mixing by means of a spiral stirring plate before mixing by means of the stirring plate, it is possible to efficiently obtain a more uniform mixture.

It is the schematic which shows the prior art example of a stirring and mixing apparatus. It is a top view which shows the example of a flat stirring plate, and shows the sectional view in A-A 'of FIG. It is a top view which shows the example of a fixing plate, and shows the sectional view in B-B 'of FIG. It is a top view of a fixed board in case outer diameter D1 of an axial part is small. It is a top view of a fixed board in case outer diameter D1 of an axial part is large. It is the schematic which shows an example (1st Example) of the stirring and mixing apparatus of this invention. It is a top view which shows the example of a spiral stirring board, and shows the cross section in C-C 'of FIG. It is a top view which shows the example of a spiral stirring board, and shows the cross section in D-D 'of FIG. It is a figure which shows the application example of the stirring and mixing apparatus of this invention. It is a figure which shows the shape of the outer peripheral end part of the flat stirring plate of the stirring and mixing apparatus of FIG. It is a figure which shows the shape of the inner side edge part of the stationary plate of the stirring and mixing apparatus of FIG. It is the schematic which shows another example (2nd Example) of the stirring and mixing apparatus of this invention. It is the schematic which shows another example (3rd Example) of the stirring and mixing apparatus of this invention. It is a perspective view which shows the 1st structural example of the stationary plate used for the stirring and mixing apparatus of FIG. It is sectional drawing in E-E 'of FIG. 11A. It is a top view which shows the helical member fitted in the stationary plate used for the stirring and mixing apparatus of FIG. It is sectional drawing in F-F 'of FIG. 12A. FIG. 12B is a perspective view of the helical member of FIG. 12A. It is a perspective view which shows the 2nd structural example of the stationary plate used for the stirring and mixing apparatus of FIG. It is sectional drawing in G-G 'of FIG. 13A. It is the schematic which shows another example (4th Example) of the stirring and mixing apparatus of this invention. It is a figure which shows arrangement | positioning of the through-hole provided in each fixed plate of FIG. It is a figure which shows another example of the stationary plate used for the stirring and mixing apparatus of FIG.

Hereinafter, the stirring and mixing apparatus according to the present invention will be described using the drawings.
FIG. 4 is a schematic view showing an example (first embodiment) of the stirring and mixing apparatus according to the present invention. The stirring and mixing apparatus 1 of this example is a flat stirring plate attached to a position different from the spiral stirring plate 5 attached to the shaft 3 performing reciprocating motion and the spiral stirring plate 5 to the shaft 3. Stirring plate 6, casing 2 surrounding spiral stirring plate 5 and flat plate-like stirring plate 6, and a plurality of protruding from the casing 2 toward the shaft portion 3 and sandwiching the flat-shaped stirring plate 6 A flow path of the mixture to be mixed is formed in the casing so that the mixture is further stirred and mixed by the flat plate-like stirring plate 6 after the mixture is stirred and mixed by the spiral stirring plate 5. It is characterized by

The shaft 3 is reciprocated by the driving means 4 and accordingly the stirring plates 5, 6 are also reciprocated. The shaft portion 3 supporting the stirring plates 5 and 6 is not limited to one, and may be plural.
The liquid or powder, which is the material to be mixed, enters the casing from the arrow a, and passes through the first section 10 having the spiral stirring plate 5 and the second section 11 having the flat stirring plate 6 in this order. It is discharged from b. The mixture supplied to the first section 10 moves toward the second section 11 while rotating around the axis of the shaft portion 3 along the spiral flow path formed by the stirring plate 5, In the process, they are mixed by the reciprocating motion of the stirring plate 5. The mixed substance mixed in the first section 10 moves toward the arrow b while sequentially passing through a plurality of small spaces divided by the fixed plate 8 in the second section 11, and each small It mixes further by the reciprocating motion of the stirring plate 6 in space. That is, the stirring and mixing apparatus 1 of this example is configured to further mix the mixture in the second zone 11 after the mixture in the first zone 10 is entirely mixed.

  In the first section 10, most of the substances to be mixed can be mixed while moving the common spiral path, so that the work (premixing) can be efficiently performed on the whole of the substances to be mixed. In the second section 11, since the material to be mixed can be mixed by the reciprocating motion of the stirring plate 6 in the small space surrounded by the side wall of the casing 2 and the fixed plate 8, it is possible to obtain a strong stirring action locally It is possible to produce mixtures in various dispersion states.

  Therefore, since the mixture moving on any route in the second section 11 is in substantially the same mixed state by the pre-mixing in the first section 10, a uniform mixture is obtained regardless of the route through which the mixture passes. You can get In addition, a uniform mixture can be obtained with a short stirring time as compared with the prior art using only the flat stirring plate 6. Moreover, since the stirring plates 5 and 6 are provided on the same shaft portion 3, there is no need to separately prepare the driving means 4, and simplification and downsizing of the apparatus can also be realized.

  As the spiral stirring plate 5, a conventional spiral stirring plate as shown in Patent Document 2 or 3 can be used. 5A shows a cross-sectional view taken along the line C-C 'of FIG. 4, and FIG. 5B shows a cross-sectional view taken along the line D-D' of FIG. The stirring plate 5 is preferably provided with a plurality of openings through which the mixture can be moved in the axial direction by the reciprocating motion of the shaft 3 so that the mixture can be stirred more efficiently. In FIGS. 5A and 5B, a plurality of through holes 50 are disposed in the vicinity of the shaft, and a plurality of notches 51 are disposed in the peripheral portion, as openings provided in the stirring plate 5. When the openings (50, 51) provided in the stirring plate 5 overlap with the openings of the adjacent stirring plate portions (the stirring plate portions before or after one rotation), the mixture passes through these openings continuously ( It is preferable to arrange so that they do not overlap with each other because it is considered that they can not be sufficiently mixed as a shortcut. In addition, as shown in FIGS. 5A and 5B, it is also effective to alternately arrange the section in which the opening is provided and the section in which the opening is not provided.

  As the flat stirring plate 6, a conventional disk-shaped stirring plate as shown in FIG. 2A can be used. As described with reference to FIGS. 2A and 2B, the stirring plate 6 has a plurality of openings in which the mixture can be moved in the axial direction by the reciprocation of the shaft 3 so that the mixture can be stirred more efficiently. Is preferably provided. Furthermore, it is preferable to provide a plurality of openings in the fixing plate 8 as well. The openings provided in the stirring plate 6 and the fixing plate 8 are not particularly limited as long as the openings provided in the stirring plate 6 and the openings provided in the fixing plate face each other. However, when the through holes 60 are disposed in the peripheral portion of the stirring plate 6 and the through holes 80 are disposed in the vicinity of the shaft portion in the fixed plate 8, the moving path of the mixture can be made longer and It becomes easy to form the flow path which turns to the opposite side of the axial part 3 in the vicinity of the part 3.

  The flat stirring plate 6 is not limited to a disk-shaped stirring plate, and may be formed of a polygonal flat plate such as a rectangular. In this case, the inner wall of the second section 11 of the casing 2 in which the stirring plate 6 is disposed may be formed in a polygonal shape similar to the shape of the stirring plate 6.

  Furthermore, in order to prevent the substance to be mixed from moving in a large amount from between the stirring plate 6 and the side wall of the casing 2 and between the fixing plate 8 and the shaft portion 3, the substance to be mixed passes between these. It is preferred to increase the fluidic resistance. As a method of increasing such fluid resistance, as shown in FIG. 6, the thickness of the outer peripheral portion 62 of the stirring plate 6 and the thickness of the inner end portion (near the shaft portion 3) 82 of the fixed plate 8 are each increased. There is a way. The outer peripheral portion 62 and the inner end portion 82 can also be manufactured by a method of cutting and scraping a part of the stirring plate 6 and the fixing plate 8, but joining a cylindrical member to the stirring plate 6 and the fixing plate 8 It is also possible.

  7 and 8 show sectional views of the outer peripheral portion 62, 62 'and sectional views of the inner end portions 82, 82'. Not limited to a rectangular cross section, it is possible to cut a part and provide a curved surface (63, 83), and change the moving direction of the mixture on the curved surface to suppress entry into the gap between the stirring plate and the side wall It is.

  Here, it is preferable that the spiral stirring plate 5 has a size in which the maximum width in the direction orthogonal to the axial direction of the shaft portion 3 is shorter than the maximum width in the same direction of the flat stirring plate 6. That is, in this example in which both the stirring plates 5 and 6 have a circular shape in plan view from above, the diameter (φ1) of the spiral stirring plate 5 is smaller than the diameter (φ2) of the flat stirring plate 6 Is preferable (.phi.1 <.phi.2). When the diameter of the stirring plate 5 is large, it is difficult to mix the mixture moving in the vicinity of the shaft and the mixture moving in the peripheral portion.

  FIG. 9 is a schematic view showing another example (second embodiment) of the stirring and mixing apparatus according to the present invention. The stirring and mixing apparatus 1 of this embodiment is an extension of the first embodiment, and has a first spiral stirring plate 5A, a first spiral stirring plate 5A, and a flat plate as spiral stirring plates. A second spiral stirring plate 5B disposed between the first and second spiral stirring plates 5A and 5B, and a position between the first spiral stirring plate 5A and the second spiral stirring plate 5B; A flat plate-like stirring plate is provided with a partition plate 7 projecting from the casing 2 toward the shaft portion 3 and after the material to be mixed is mixed by the first spiral stirring plate 5A and mixed by the second spiral 5B. It is characterized in that a flow path of the mixture is formed so as to be further mixed by 6.

  That is, in the stirring and mixing apparatus 2 of the second embodiment, the first section 10 is divided into a plurality of blocks by the partition plate 7, and after mixing the mixture in each block of the first section 10 by the spiral stirring plate. The second mixture 11 is configured to further mix the mixture. According to such a configuration, the degree of mixing is gradually increased such that the mixture is coarsely mixed by the stirring plate 5A in the first block and the mixture is further firmly mixed by the stirring plate 5B in the next block. It is possible to perform various step-wise mixing. In this case, it is preferable that the pitches and sizes (diameters) of the spirals be different from each other in order to obtain a desired degree of mixing of the stirring plate 5A and the stirring plate 5B. Further, as shown in FIG. 9, in order to enhance the stirring efficiency, the direction of the spiral of the stirring plate 5A and the direction of the spiral of the stirring plate 5B may be reversed. The number of spiral stirring plates is not limited to two, and may be three or more. That is, the first section 10 may be divided into three or more blocks.

  Further, the configuration in which the first section 10 is divided into a plurality of blocks is also effective in the case of adding the mixture on the way. The code a1 means that liquid or powder is added in the middle of mixing. That is, after mixing the liquid and powder which are the mixture put from the arrow a entirely with the stirring plate 5A, the liquid and the powder put from the code a1 are added to the mixture to be further mixed as a whole. The mixture can be supplied to the second section 11 in a state where it can be mixed to a certain extent.

  FIG. 10 is a schematic view showing another example (third embodiment) of the stirring and mixing apparatus according to the present invention. The stirring and mixing apparatus 1 of this embodiment is another extension of the first embodiment, and a movement of the mixture around the shaft 3 is generated in the fixed plate 8 by the movement of the flat stirring plate 6. It is characterized in that a flow path (C3) for the purpose is formed.

  Such a flow path can be received not only by the fixed plate 8 but also by the stirring plate 6. However, since the stirring plate 6 reciprocates, even if the mixed material flows around the shaft 3 in one direction with movement in the other direction, the mixed material moves in the reverse direction of the shaft 3 in the other direction. As a result, the mixture can not efficiently wrap around on the other side of the shaft. For this reason, it is more preferable to provide such a flow path in the fixed plate 8.

  FIGS. 11A and 11B show a first configuration example of the fixing plate 8 having a flow path that turns to the opposite side of the shaft. A spiral groove 81 opened on the side of the shaft 3 is formed at the inner end of the fixed plate 8. 11B shows a cross-sectional view taken along the line E-E 'of FIG. 11A. The spiral groove 81 is configured such that the position of the inlet on the lower surface side of the fixing plate 8 and the position of the outlet on the upper surface do not match when the fixing plate 8 is viewed in plan from above. In FIG. 5B, the inlet and the outlet are disposed at positions shifted by 180 degrees in the circumferential direction of the shaft portion 3. Thus, when the positions of the inlet and the outlet of the groove 81 are deviated in plan view, it is possible to move the mixture around the shaft 3, for example, the object on the opposite side of the shaft It becomes possible to mix easily with the mixture.

  The groove 81 shown in FIGS. 11A and 11B can be formed by cutting in the lateral direction from the opening at the center of the fixing plate 8 (the opening into which the shaft 3 is inserted). However, the present invention is not limited to this, and as shown in FIGS. 12A, 12B and 12C, a helical member 85 for forming a groove is separately formed, and the helical member 85 is fitted into the central opening of the disc-like member 84. It is possible to construct a spiral groove. 12B is a cross-sectional view taken along line F-F 'of FIG. 12A. In FIG. 12, the spiral tip portion is configured to partially overlap in plan view (the arc portion of about 20 degrees overlaps).

  13A and 13B are diagrams showing a second configuration example of the fixing plate. A feature of the second configuration example is that the through holes 82 provided in the fixing plate 8 are inclined with respect to the circumferential direction of the shaft portion 3. 13B is a cross-sectional view taken along line G-G 'of FIG. 13A. In the case where a plurality of through holes 82 are provided around the shaft portion 3, the inclined direction may be the same for all the through holes, or the through holes inclined in the opposite direction may be partially disposed. The mixture can be moved around the shaft 3 also by such inclined through holes 82. However, it is difficult to form a flow channel that wraps at a large angle, such as a spiral groove. For this reason, it is preferable to use a plurality of through holes 82 to enhance the effect of flowing around the shaft 3.

  FIG. 14 is a schematic view showing another example (fourth embodiment) of the stirring and mixing apparatus according to the present invention. FIG. 14 mainly shows the configuration of the second section portion, and the configuration of the other portions is omitted. In the fourth embodiment, a flow in which the mixture moves in the circumferential direction of the shaft portion is formed by using an arrangement pattern of a plurality of through holes formed in the fixing plate. For that purpose, the formation position of the through hole formed in the fixing plate is a position not facing the opening formed in the adjacent stirring plate (the formation position does not match in plan view), and the adjacent fixing is performed. It is characterized in that it is a position not opposed to the through holes respectively formed in the plate.

  In the fourth embodiment, as shown in FIG. 14, a plurality of fixing plates (8a to 8d) are used. FIG. 15 shows the arrangement positions of the through holes 83 provided in the respective fixing plates (8a to 8d). When comparing FIG. 15 with the arrangement pattern of the through holes of the conventional fixing plate (for example, FIG. 2B), the arrangement of the through holes 83 in FIG. 15 is locally uneven distribution rather than a uniform pattern around the shaft 3. There is. In FIG. 15, the unevenly distributed places are one place (one place where the through holes 83 are lined up), but a plurality of places may be provided in the circumferential direction.

  Then, by shifting the unevenly distributed position of the through hole 83 for each fixed plate, it becomes possible to generate movement of the mixture around the shaft portion 3. In FIG. 15, in the fixing plate 8 a, the mixture is allowed to pass through the through hole 83 on the upper side of the shaft 3, and in the fixing plate 8 b, the mixture is allowed to pass through the lower through hole 83 of the shaft 3. Furthermore, in the fixed plate 8c, the mixed material is allowed to pass through the upper side of the shaft portion 3 and the lower side of the shaft portion 3 in the fixed plate 8d. Thus, the mixture can be moved in the circumferential direction by changing the passing position of the mixture in the circumferential direction for each fixed plate.

  FIG. 16 is a diagram showing that the unevenly distributed position of the through holes (83, 83 ') is shifted by an angle θ for each fixing plate. This θ can be set arbitrarily according to the number of fixing plates.

  As mentioned above, although this invention was demonstrated based on the Example, this invention is not limited to the content mentioned above, It can not be overemphasized that a design change can be suitably carried out in the range which does not deviate from the meaning of this invention. For example, it is possible to combine each embodiment.

  As described above, according to the present invention, it is possible to provide a stirring and mixing apparatus that improves the production efficiency of a uniform mixture.

1 Stir mixing device 2 Casing (side wall)
3 Shaft 4 Drive device 5 Spiral stirring plate 6 Flat plate stirring plate 7 Partition plate 8 Fixing plate a Inlet b Outlet

Claims (5)

A helical stirring plate attached to a shaft for reciprocating movement;
A flat stirring plate attached to the shaft at a position different from the spiral stirring plate;
The spiral stirring plate and a casing surrounding the flat stirring plate;
And a plurality of fixed plates which project from the casing toward the shaft and are disposed so as to sandwich the flat stirring plate.
Stirring characterized in that the flow path of the mixture is formed in the casing so that the mixture is mixed by the spiral stirring plate and then mixed further by the flat stirring plate. Mixing device. In the stirring and mixing apparatus according to claim 1,
As the spiral stirring plate, a first spiral stirring plate, and a second spiral stirring plate disposed between the first spiral stirring plate and the flat stirring plate Have
A partition plate projecting from the casing toward the shaft at a position between the first spiral stirring plate and the second spiral stirring plate;
A flow path of the mixture is formed such that the mixture is mixed by the first spiral stirring plate and mixed by the second spiral and then mixed further by the flat stirring plate. A stirring and mixing device characterized in that In the stirring and mixing apparatus according to claim 1 or 2,
The stirring and mixing apparatus according to claim 1, wherein the spiral stirring plate has a maximum width in a direction orthogonal to the axial direction of the shaft portion shorter than a maximum width in the same direction of the flat stirring plate. The stirring and mixing device according to any one of claims 1 to 3.
In at least one of the spiral stirring plate or the flat stirring plate, a plurality of through holes through which the mixture can be moved in the axial direction of the shaft portion are formed by the reciprocating motion of the shaft portion. A stirring and mixing apparatus characterized in that. The stirring and mixing device according to any one of claims 1 to 4.
A stirring and mixing device characterized in that the fixed plate is formed with a flow path for generating a flow of the mixture around the shaft by the movement of the flat stirring plate.

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